WO2012157644A1 - 発光装置及びその製造方法 - Google Patents
発光装置及びその製造方法 Download PDFInfo
- Publication number
- WO2012157644A1 WO2012157644A1 PCT/JP2012/062418 JP2012062418W WO2012157644A1 WO 2012157644 A1 WO2012157644 A1 WO 2012157644A1 JP 2012062418 W JP2012062418 W JP 2012062418W WO 2012157644 A1 WO2012157644 A1 WO 2012157644A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light emitting
- emitting device
- sealing member
- protrusion
- sealing
- Prior art date
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Classifications
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- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/483—Containers
- H01L33/486—Containers adapted for surface mounting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/93—Batch processes
- H01L24/95—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
- H01L24/97—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/54—Encapsulations having a particular shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
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Definitions
- the present invention relates to a light emitting device including a sealing member for sealing a light emitting element and a method for manufacturing the same.
- Light-emitting devices equipped with light-emitting elements such as light-emitting diodes (LEDs) and laser diodes (Laser-diodes: LD) are expected to be the next-generation lighting source because of their low power consumption and long life. There is a need for further higher output and improved luminous efficiency.
- LEDs light-emitting diodes
- Laser-diodes: LD laser diodes
- Patent Document 1 a damming portion having one edge portion on an upper surface is provided on a flat substrate on which a light emitting element is mounted, and a sealing resin for sealing the light emitting element is dammed by the damming portion.
- a cured illuminating device and a method of manufacturing the same are described.
- a plurality of LED chips, an annular light reflecting member that is formed by a coating method so as to surround the LED chips and forms a resin position-limited space, and a resin position-limited space are provided on the circuit board.
- the LED package structure in which the weight of the resin and the area of the resin position limited space are in a predetermined ratio, and the manufacturing method thereof are described.
- the light extraction efficiency of the light-emitting device is most easily increased by forming the surface of the sealing member into a spherical surface having the light-emitting element as the center.
- the lighting device described in Patent Document 1 and the manufacturing method thereof in order to control the height of the sealing resin, high work accuracy is required for the edge portion of the damming portion. The simple method cannot obtain the accuracy, and the height of the sealing resin is likely to vary. Therefore, variation in light extraction efficiency of the light emitting device is likely to occur.
- the surface of the convex lens can be molded only into a convex surface having a contact angle specific to the material with respect to the top horizontal surface of the annular light reflecting member. Light extraction efficiency cannot be obtained.
- the present invention has been made in view of such circumstances, and an object thereof is to provide a light emitting device excellent in light extraction efficiency and a manufacturing method thereof.
- the first light emitting device manufacturing method includes: In a step of forming a sealing member for sealing the light emitting element by dropping on a substrate having a conductive member to which the light emitting element is connected and a molded body integrally formed with the conductive member,
- the sealing member is formed such that at least a part of an edge of the sealing member is provided on an outward surface of the conductive member or the molded body facing outward in a top view.
- the first light emitting device is mainly manufactured by the first manufacturing method, A light emitting element; A substrate having a conductive member to which the light emitting element is connected, and a molded body integrally formed with the conductive member; A sealing member for sealing the light emitting element, At least a part of the edge of the sealing member is provided on an outward surface facing the outer side in the top view of the conductive member or the molded body, and with respect to the outward surface or the outward surface and the sealing member.
- the contact point of the edge is provided so as to form a substantially contact angle or an angle less than the contact angle with respect to a tangential plane contacting the outward surface.
- the second light emitting device manufacturing method includes: A first step of providing a protrusion outside the light emitting element on the upper surface of the wiring board on which the light emitting element is placed; And a second step of forming a sealing member for sealing the light emitting element by dropping, The sealing member is formed such that at least a part of an edge of the sealing member is provided on an outward surface facing the outer side of the projection as viewed from above.
- the second light emitting device is mainly manufactured by the second manufacturing method, A light emitting element; A wiring board provided with a protrusion outside the light emitting element on the upper surface on which the light emitting element is placed; A sealing member for sealing the light emitting element, At least a part of the edge of the sealing member is provided on an outward surface facing the outer side of the projection when viewed from above, and the contact with the outward surface or the edge of the sealing member is the outer surface. It is characterized by being provided at an angle substantially less than or less than the contact angle with respect to the tangential plane in contact with the outward surface.
- the “upper surface” is a surface on the light emission observation side of the light emitting device.
- the “horizontal plane in the top view of the light emitting device” is a plane perpendicular to the optical axis of the light emitting device (which can be defined as an axis perpendicular to the upper surface of the light emitting element or the mounting surface of the light emitting element) Point to.
- “Outward” and “outer” are directions away from the light emitting element when the light emitting device is viewed from above.
- “inward” and “inner” are directions toward the light emitting element when the light emitting device is viewed from above.
- the “outward surface” of the molded body, the conductive member, and the protrusion means that the normal vector of the surface includes an outward component on the surface of the molded body, the conductive member, and the protrusion (referred to as a molded body).
- Means that “Substantially contact angle or less than contact angle” means an angle that is substantially equal to or less than the contact angle.
- the surface of the sealing member is formed by the surface tension of the sealing member having fluidity before solidification.
- the height of the sealing member (mainly, the distance from the mounting surface of the light emitting element to the surface of the sealing member in the optical axis direction of the light emitting device) is a seal in a state having fluidity with respect to the surface of the molded body or the like.
- the lower the wettability of the stop member (that is, the higher the contact angle), the higher the stop member.
- the contact angle can be artificially increased by the inclination angle of the outward surface. it can.
- the height of the sealing member can be increased. Further, it is possible to control the height of the sealing member with high accuracy by controlling the inclination angle of the outward surface.
- the first and second light emitting devices of the present invention can be manufactured by the above-described manufacturing method, a light emitting device with little variation in the height of the sealing member can be obtained. Further, according to the manufacturing method described above, the height of the sealing member can be adjusted, so that a light emitting device including a sealing member having a surface shape suitable for increasing the light extraction efficiency can be obtained. it can.
- the surface of the sealing member can be easily formed into a highly protruding convex surface, so that a light-emitting device with excellent light extraction efficiency can be manufactured at low cost. Further, according to the light emitting device according to the present invention, since the surface of the sealing member is a convex surface protruding high, the light use efficiency toward the front direction of the light emitting device is increased, and the light emission excellent in light extraction efficiency is achieved. A device is obtained.
- FIG. 1A is a schematic top view of a light emitting device according to an embodiment of the present invention
- FIG. FIG. 3 is a schematic cross-sectional view (a) to (e) showing an example of a method for manufacturing a light-emitting device according to an embodiment of the present invention.
- FIG. 4 is a schematic cross-sectional view (a) to (f) for explaining the relationship between a solid surface and the surface shape of a liquid droplet dropped thereon.
- 1A is a schematic top view of a light emitting device according to an embodiment of the present invention
- FIG. 1A is a schematic top view of a light emitting device according to an embodiment of the present invention
- FIG. 1A is a schematic top view of a light emitting device according to an embodiment of the present invention
- FIG. 1A is a schematic top view of a light emitting device according to an embodiment of the present invention
- FIGS. 2B and 2C are schematic cross-sectional views of a DD section and an EE section.
- 1A is a schematic top view of a light emitting device according to an embodiment of the present invention
- FIG. 1A is a schematic top view of a light emitting device according to an embodiment of the present invention
- FIG. FIG. 3 is a schematic cross-sectional view (a) to (e) showing an example of a method for manufacturing a light-emitting device according to an embodiment of the present invention
- 1A is a schematic top view of a light emitting device according to an embodiment of the present invention
- FIG. 1A is a schematic top view of a light emitting device according to an embodiment of the present invention
- FIG. 1A to 1D are schematic views showing an example of a method for manufacturing a light emitting device according to an embodiment of the present invention. It is the schematic sectional drawing (a) of the light-emitting device which concerns on one Example of this invention, and the schematic sectional drawing (b) of the light-emitting device which concerns on one comparative example.
- FIG. 1A is a schematic top view of the light-emitting device according to Embodiment 1
- FIG. 1B is a schematic cross-sectional view showing a cross section AA in FIG. 1A.
- the light emitting device 100 of the example shown in FIG. 1 seals the light emitting element 10, the base member 30 having the conductive member 20 to which the light emitting element 10 is connected and the molded body 25 integrally formed with the conductive member 20, and the light emitting element 10. Sealing member 40 to be provided.
- the base 30 is a package having a pair of positive and negative lead frame conductive members 20 and a resin molded body 25 that integrally holds the conductive members.
- the base body 30 includes a recess 31 on the upper surface side. A part of the bottom surface of the recess 31 is constituted by a part of the surface of the conductive member 20.
- the light emitting element 10 is an LED chip, and is bonded to the bottom surface of the recess 31 of the base with an adhesive (not shown) and connected to the conductive member 20 with a wire.
- the sealing member 40 is a sealing resin provided so as to cover the light emitting element 10 inside the recess 31 of the base.
- the sealing member 40 may contain a phosphor or a diffusing agent.
- the surface of the sealing member 40 protrudes upwards from the base
- the surface on which the surface 45 of the sealing member rises in other words, the surface on which the edge of the sealing member 40 is provided is referred to as “sealing standing surface 37”.
- the sealing upstanding surface 37 is an outward surface 38 facing outward from the top surface of the base body 30.
- FIGS. 2A to 2E are schematic cross-sectional views showing an example of a method for manufacturing the light emitting device according to the first embodiment.
- the light emitting device 100 shown in FIG. 1 is manufactured through the following steps. Note that the method for manufacturing a light emitting device of the present invention only needs to include at least a step of forming a sealing member on a substrate on which the light emitting element is mounted, and the manufacturing method described here is merely an example.
- a molded body 25 is integrally formed with the conductive member 20 to form a base body 30.
- a plate-like member in which a plurality of conductive members 20 are connected is sandwiched between an upper die and a lower die that have been processed into a predetermined shape, and a fluid state (liquid, sol).
- a fluid state liquid, sol
- the constituent material of the molded body 25 in the form of a slurry or a slurry is injected and solidified. Thereafter, when the molded body 25 is released from the mold, a plurality of base bodies 30 in a state of being connected to each other are obtained.
- the light emitting element 10 is mounted on the substrate 30. Specifically, the light emitting element 10 is bonded to the base 30 with an adhesive, and is further connected to the conductive member 20 with a wire.
- the sealing member 40 is formed on the base body 30.
- the sealing member is formed by dropping (potting).
- the dropping method is an inexpensive molding method that does not use a molding machine or a mold as compared with a compression molding method, a transfer molding method, an injection molding method, or a casting molding method.
- the sealing member 40 in a fluid state liquid, sol, or slurry
- the stop member 40 is solidified by heating or cooling.
- the sealing member 40 is molded so that at least a part of the sealing standing surface 37 is the outward surface 38.
- the sealing member 40 is shaped such that at least a part of the surface 45 rises from the outward surface 38 of the base body 30.
- the angle formed between the tangent line of the surface 45 of the sealing member 40 (at the contact point between the outward surface 38 and the edge of the sealing member 40) and the outward surface 38 is a substantially contact angle.
- the “contact angle” is determined by the physical properties of the sealing member 40 and the outward surface 38 in a state having fluidity before solidification.
- the sealing member 40 may be solidified with the base body 30 turned upside down, that is, with the upper surface of the base body 30 onto which the sealing member 40 is dropped facing downward in the vertical direction. If it does so, the sealing resin 40 can be solidified in the state which the sealing resin 40 in the state which has fluidity
- the plate-shaped member is cut to separate the light emitting device 100 into individual pieces.
- the base member 30 may be separated into pieces by cutting the plate member.
- the surface of the sealing resin rises from the upper surface that is higher (that is, inward) from the front of the horizontal direction of the damming portion or from the front of the resin flow direction. Yes.
- the surface of the convex lens rises from the inner surface of the annular light reflecting member.
- the sealing member since the sealing member is provided on the base as described above, the surface of the sealing member can be relatively stably formed into a convex surface that protrudes highly, and the light extraction efficiency is sufficient. Can be increased.
- the inventors have raised the surface of the sealing member from the outward surface of the substrate, contrary to the conventional idea.
- the present inventors have found that it is a secret that can be molded relatively stably. The principle will be described below.
- 3 (a) to 3 (f) are schematic cross-sectional views for explaining the relationship between the solid surface and the surface shape of the liquid droplets dropped on the solid surface.
- the droplet L dropped on the flat surface of the solid S has a convex curved surface that forms a contact angle ⁇ [degree] with the surface of the solid S due to its surface tension.
- the contact angle ⁇ is defined as an angle formed by the tangent to the surface of the droplet L and the surface of the solid S (an angle including the droplet L) at the contact point between the surface (edge) of the droplet L and the solid S.
- This contact angle ⁇ is determined by the surface tension of the material constituting each of the droplet L and the solid S.
- the contact angle ⁇ takes a specific value.
- the surface tension of the droplet L is ⁇ L
- the surface tension of the solid S is ⁇ S
- the interfacial tension ⁇ SL between the droplet L and the solid S is as follows (Young's equation)
- the surface of the solid S is inclined at an angle ⁇ [degree] from the horizontal plane as shown in FIG.
- the contact angle of the droplet L with respect to the surface of the inclined solid S is maintained substantially ⁇ , but the pseudo contact angle with respect to the horizontal plane is approximately ⁇ + ⁇ . Therefore, as shown in FIG. 3C, the height h of the droplet L can be increased by raising the surface of the droplet L from the outward surface facing outward in the top view of the solid S. As shown in FIG.
- tangential plane when the surface of the solid S is a convex curved surface, a plane (“tangential plane”) that contacts the surface of the solid S at the contact point between the solid S and the edge of the droplet L. Call).
- the tangential plane is inclined by an angle ⁇ [degree] with respect to the horizontal plane, and the pseudo contact angle of the droplet L with respect to the horizontal plane is substantially ⁇ + ⁇ .
- the contact angle between the droplet L and the horizontal upper surface of the solid S is the original contact angle.
- a phenomenon called “wetting pinning effect” that cannot get over the edge part until reaching the sum of ⁇ and the downward angle of the outward surface of the edge part (inclination angle from the upper surface) ⁇ [degrees]. is there.
- the contact angle of the droplet L can take any value from ⁇ to ⁇ + ⁇ . Therefore, the height of the droplet L can be increased by utilizing this “wetting pinning effect”.
- the droplet L at this time is in a relatively unstable state, and even if an attempt is made to control the height of the droplet L using this phenomenon, the height varies greatly. Further, as described above, in order to control the height of the droplet L using this phenomenon, high working accuracy is required at the edge portion.
- FIG. 3C when the surface of the droplet L rises from the outward surface of the solid S, the droplet L has a substantially original contact angle ⁇ with respect to the outward surface of the solid S. Therefore, the height can be obtained with good reproducibility. As shown in FIG.
- the contact angle ⁇ of the sealing member 40 is the sealing It is determined by the surface tension of the member 40, the surface tension of the base body 30 on which the edge of the sealing member 40 is provided, and the interfacial tension between the sealing member 40 and the base body 30.
- the edge of the sealing member 40 on the outward surface 38, the angle formed by the tangent to the surface 45 of the sealing member (at the contact point between the outward surface 38 and the edge of the sealing member) and the outward surface 38.
- the sealing member 40 is formed so that at least a part of the sealing rising surface 37 is the outward surface 38, and thus the surface 45 of the sealing member is easily raised in the vertical direction from the outward surface 38. Become.
- the surface of the sealing member 40 can be easily formed into a highly protruding convex surface, preferably a convex curved surface, and thus a substantially spherical surface.
- the surface shape can be obtained with good reproducibility. Therefore, a light emitting device having excellent light extraction efficiency can be manufactured at low cost.
- the sealing member surface into a highly protruding convex surface by forming the sealing member by dropping after forming a film having a small surface tension over the entire upper surface of the substrate.
- the adhesion between the base and the sealing member may be significantly reduced due to the coating interposed between the base and the sealing member.
- the sealing member is basically in direct contact with the surface of the base, and high adhesion between the base and the sealing member is obtained. Can be provided. In particular, by raising the surface of the sealing member from the outward surface of the base, the edge of the sealing member acts so as to be locked to the base, and the adhesion between the base and the sealing member can be further enhanced. .
- the base body 30 includes a protrusion 33.
- the base body 30 of this example includes a groove 35 in addition to the protrusion 33. It may be said that the protrusion 33 is formed by the groove 35. Since the base body 30 includes the protrusions 33 or the grooves 35, the outward surface 38 is provided on the inner side of the outermost end surface of the base body 30. Then, at least a part of the surface 45 of the sealing member can be raised from the outward surface 38 of the protrusion 33 or the groove 35.
- the outflow of the sealing member 40 to the outside of the base body 30 is suppressed, and the surface 45 of the sealing member can be stably formed into a highly protruding convex surface inside the outermost end face of the base body 30. it can. Moreover, it can suppress that the exposed part of the electrically-conductive member 20 used as the terminal part for external connection is contaminated with the oozing-out component of the sealing member 40.
- the base body includes a protrusion or a groove, and at least a part of the sealing standing surface is provided on the outward surface of the protrusion or the groove.
- substrate is provided with both a languages
- channel may be provided mutually spaced apart.
- the protrusions and grooves of the base body can be omitted, and at least a part or the whole of the sealing upright surface may be provided on the outward surface which is the outermost end surface of the base body.
- the outward surface 38 of the protrusion 33 or the groove 35 is a lower surface continuous with the convex curved surface.
- the sealing member in a fluid state is dropped onto the base and reaches the edge formed by the outward surface of the base and the continuous surface above the base.
- the outward surface is a flat surface bent from the upper surface, the sealing member is temporarily accumulated on the upper surface of the outward surface due to the “wetting pinning effect” described above.
- a sealing member gets over the edge part there exists a possibility of flowing out vigorously by the weight of itself enlarged and destroying the surface shape.
- the outward surface of the substrate has a convex curved surface at the uppermost position, as described above, the “wetting pinning effect” can be suppressed and the sealing member can be smoothly moved onto the outward surface. . Thereby, it can make it easy to shape
- at least a part of the sealing upright surface 37 may be a convex curved surface on the outward surface 38, or may be a surface that continues beyond the convex curved surface.
- the outward surface 38 is preferably a convex curved surface or a lower surface continuous with the convex curved surface.
- the uppermost surface of the outward surface 38 is a convex curved surface, so that chipping of the molded body 25 due to biting on the mold is suppressed and the moldability of the molded body 25 is improved. Can be increased.
- the surface of the sealing member 40 can be protruded higher as the inclination angle ( ⁇ ) of the outward surface 38 from the substantially horizontal upper surface of the base body 30 is larger.
- the inclination angle ( ⁇ ) of the outward surface 38 is preferably 90 degrees or less in consideration of the releasability of the base body 30 from the mold. Therefore, the inclination angle ( ⁇ ) of the outward surface 38 that becomes the sealing rising surface 37 is preferably 45 to 90 degrees, and more preferably 70 to 90 degrees.
- the inward surface 391 of the protrusion 33 facing the inner side in the top view of the base body has a convex curved surface at the uppermost position.
- a sealing member in a fluid state is dropped on a base and reaches an edge formed by an inward surface of the base and a continuous surface on the upper side.
- the inward surface is a flat surface bent from the upper surface, the sealing member is temporarily accumulated on the inward surface due to the “wetting pinning effect” described above.
- a sealing member gets over the edge part there exists a possibility of flowing out vigorously by the weight of itself enlarged, and also flowing out beyond an outward surface.
- the inward surface 391 of the base body 30 has a convex curved surface at the uppermost position, as described above, the “wetting pinning effect” is suppressed, and the sealing member 40 is continuous to the upper side, and thus outward. It can be moved smoothly onto the surface 38. Thereby, it can make it easy to shape
- at least a part, most preferably all, of the inwardly facing surface 391 inside the sealing rising surface 37 and facing the top surface of the base body is located at the topmost position. It preferably has a convex curved surface.
- the protrusion 33 and the groove 35 are provided in a perfect circle shape surrounding the light emitting element 10 in a top view of the base body 30.
- the protrusion 33 or the groove 35 provides an outward surface 38 for raising the surface 45 of the sealing member, and functions as a barrier for blocking the sealing member 40 in a fluid state.
- the protrusion or the groove is provided in a frame shape surrounding the light emitting element.
- the surface 45 of the sealing member is easily formed from the protrusion to the protrusion or from the groove to the groove, the symmetry of the surface shape of the sealing member 40 can be enhanced.
- the protrusion 33 or the groove 35 is preferably provided in an annular shape in the top view of the base body 30, and is preferably provided in an elliptical shape, and more preferably provided in a perfect circular shape.
- the surface of the sealing member 40 can be shape
- the protrusion 33 or the groove 35 is disposed so that the light emitting element 10 is substantially at the center, thereby improving the symmetry of light distribution.
- the protrusion is more preferable than the groove from the viewpoint of a barrier for blocking the sealing member having fluidity.
- the base body 30 includes a recess 31, and the protrusion 33 and the groove 35 are provided in the recess 31.
- the sealing member 40 is provided inside the recess 31.
- the base body includes a recess in which the light emitting element is placed inside, and the sealing upright surface is provided in the recess. Since the base body 30 includes the concave portion 31, the outflow of the sealing member 40 to the outside of the base body 30 can be suppressed, and the sealing member 40 can be easily molded stably in the concave portion 31. Further, since the sealing member 40 is provided inside the recess 31, the apparatus can be reduced in size.
- the molded body 25 constituting the recess 31 functions as a barrier that protects the sealing member 40 from damage due to external force and contamination by dust.
- the inner wall surface of the recess 31 functions as a reflecting mirror that reflects light emitted from the light emitting element 10 toward the front of the device (above the base 30) and effectively extracts the light, thereby increasing the front luminous intensity of the light emitting device.
- these effects can be remarkably obtained.
- the sealing rising surface 37 is provided on the outward surface 38 of the groove 35, and the groove 35 has an inward surface 392 that faces the outward surface 38. is doing.
- the inward surface 392 is a part of the inner wall surface of the recess 31.
- the base body has an inward surface facing the inner side in the top view of the base body on the outer side than the outward surface on which the sealing upstanding surface is provided.
- the light emitted from the edge of the sealing member 40 provided on the outward surface 38 of the base body 30 is directed to the front of the apparatus by the inward surface 392 and / or the bottom surface between the inward surface and the outward surface 38. It can be reflected and taken out effectively.
- the inward surface 392 that faces the outward surface 38 on which the sealing standing surface 37 is provided is inclined so as to open upward or curved in such a manner. Thereby, the light radiate
- the inward surface 392 that faces the outward surface 38 on which the sealing standing surface 37 is provided is preferably provided to substantially the same height as the outward surface 38, and is provided to extend higher than the outward surface 38. More preferably. Thereby, it is easy to reflect the light emitted from the edge of the sealing member 40 provided on the outward surface 38 of the base body 30 to the front of the apparatus.
- Such an inward surface 392 is difficult to be provided in a molding method of a sealing member using a molding machine or a mold because the molding machine or the mold interferes.
- FIG. 4A is a schematic top view of the light-emitting device according to Embodiment 2
- FIG. 4B is a schematic cross-sectional view showing a BB cross section in FIG. 4A.
- the light emitting device 200 of the example shown in FIG. 4 seals the light emitting element 10, the base member 30 having the conductive member 20 to which the light emitting element 10 is connected and the molded body 25 integrally formed with the conductive member 20, and the light emitting element 10. Sealing member 40 to be provided.
- the base 30 is a package having a pair of positive and negative lead frame conductive members 20 and a resin molded body 25 that integrally holds the conductive members.
- the base body 30 includes a recess 31 on the upper surface side. A part of the bottom surface of the recess 31 is constituted by a part of the surface of the conductive member 20.
- the light emitting element 10 is an LED chip, and is bonded to the bottom surface of the recess 31 of the base with an adhesive (not shown) and connected to the conductive member 20 with a wire.
- the sealing member 40 is a sealing resin provided so as to cover the light emitting element 10 inside the recess 31 of the base.
- the base body 30 includes a first protrusion 331 and a second protrusion 332 provided outside the first protrusion 331.
- the base body 30 of the present example includes a first groove 351 and a second groove 352 provided outside the first groove 351 in addition to these protrusions. It can be said that the first and second protrusions are formed by the first and second grooves, respectively.
- the base body includes the first protrusion or the first groove and the second protrusion or the second groove outside the first protrusion or the first groove. It is preferable to be provided on the outward face of any one of the second protrusion and the first and second grooves.
- the base body 30 includes the plurality of protrusions 331 and 332 or the plurality of grooves 351 and 352, the plurality of outward faces 38 are provided on the inner side of the outermost end surface of the base body 30. Then, at least a part of the surface 45 of the sealing member can be raised from the outward surface 38 of any one of the protrusions 331 and 332 or the grooves 351 and 352.
- the outward surface 38 as the sealing standing surface can be selected, and the sealing member 40 is adjusted while adjusting the size of the sealing member 40.
- the surface of 40 can be formed into a convex surface projecting high.
- channel 351 is provided inside the wire connection part to which the wire of the electrically-conductive member 20 is connected. Thereby, it can suppress that the wire connection part of the electrically-conductive member 20 is contaminated with the oozing-out component of the adhesive which adhere
- the first protrusion 331 or the first groove 351 can be formed in the conductive member 20 by press working, die molding, or the like.
- the sealing member 40 includes a first sealing portion 401 that seals the light emitting element 10, and a second sealing portion 402 that seals the first sealing portion 401. It is equipped with.
- the first sealing portion 401 includes at least a part of the first sealing rising surface 371 on which the surface 451 of the first sealing portion rises among the constituent surfaces of the base body 30 as the first protrusion 331 or the first The outer surface 38 of the groove 351 is formed.
- the second sealing portion 402 has at least a part of the second sealing rising surface 372 on which the surface 452 of the second sealing portion rises among the constituent surfaces of the base body 30 as the second protrusion 332 or the second projection.
- each sealing portion (each layer) can be relatively stably molded into a convex surface that protrudes highly. It is easy to suppress the reflection of light at the interface of the sealing portion and increase the light extraction efficiency.
- each sealing portion may be made of the same material and have the same refractive index, but from the light emitting element 10 by gradually making the refractive index of each sealing portion closer to the refractive index of air. Light can be efficiently extracted into the sealing member 40, and reflection of light at the interface between the two sealing portions can be suppressed to further increase the light extraction efficiency.
- the refractive index of the second sealing portion 402 is preferably lower than the refractive index of the first sealing portion 401.
- the second sealing portion 402 may be molded after the first sealing portion 401 is completely solidified, but by molding the first sealing portion 401 in a semi-solidified or unsolidified state, The adhesion between the first sealing portion 401 and the second sealing portion 402 can be improved.
- the 1st sealing part 401 is an internal area
- the surface 451 of the first sealing portion 401 rises from the end of the upper surface serving as a boundary with the first protrusion 331 of the base body 30 or the outward surface 38 of the first groove 351.
- a preferable aspect similar to that of the inward surface 392 described above can be applied to the first sealing portion 401 also on the inward surface facing the outward surface 38 of the first groove 351.
- the sealing member 40 includes the phosphor 50 that is excited by the light emitted from the light emitting element 10 only in the first sealing portion 401.
- the wavelength conversion and scattering of light by the phosphor 50 is performed only in the first sealing portion 401, that is, in the vicinity of the light emitting element 10 in the sealing member 40.
- the light source can be made smaller with respect to the surface of the sealing member, and the light extraction efficiency can be increased.
- the surface of the first sealing portion 401 can be formed into a highly protruding convex surface, the variation in the optical path length in each direction in the first sealing portion 401 can be reduced, and the first sealing portion 401 Even if the phosphor 50 is dispersed in 401, it is possible to emit light with substantially uniform chromaticity.
- the fluorescent substance 50 may be settled and a diffusing agent may be disperse
- the uppermost position of the outward surface 38 of the first protrusion 331 or the first groove 351 is a flat surface.
- the outward surface 38 is most preferably a convex curved surface, but the downward angle from the upper plane continuous with the outward surface ( The plane may be preferably 45 ° or less, more preferably 30 ° or less.
- the plane may be preferably 45 ° or less, more preferably 30 ° or less.
- the “upper plane continuous with the outward surface” is not limited to the substantially horizontal upper surface of the base body 30 and may be an outward surface. That is, the outward surface 38 may be configured by a plurality of planes in which the descending angle of the lower plane from the upper plane is preferably 45 degrees or less, more preferably 30 degrees or less.
- FIG. 5A is a schematic top view of the light-emitting device according to Embodiment 3, and FIG. 5B is a schematic cross-sectional view showing a CC cross section in FIG. 5A.
- the light emitting device 300 of the example shown in FIG. 5 seals the light emitting element 10, the base member 30 having the conductive member 20 to which the light emitting element 10 is connected and the molded body 25 integrally formed with the conductive member 20, and the light emitting element 10. Sealing member 40 to be provided.
- the base 30 is a package having a pair of positive and negative lead frame conductive members 20 and a resin molded body 25 that integrally holds the conductive members.
- the base body 30 includes a recess 31 on the upper surface side. A part of the bottom surface of the recess 31 is constituted by a part of the surface of the conductive member 20.
- the light emitting element 10 is an LED chip, and a plurality of light emitting elements 10 are bonded to the bottom surface of the concave portion 31 of the base with an adhesive (not shown) and connected to the conductive member 20 with a wire.
- the sealing member 40 is a sealing resin provided on the base 30 so as to cover the light emitting element 10.
- the base body 30 includes a protrusion 33 formed on the outside of the recess 31.
- the protrusion 33 or the groove on the outer side of the recess 31 it becomes easier to form a larger sealing member 40 having at least a part of the sealing rising surface 37 as the outward surface 38 of the protrusion or groove, It is easy to increase the light extraction efficiency.
- the concave portion 31 can be easily configured to have a large opening area so that substantially the entire area of the inner wall surface can be used as a reflecting mirror, and the light extraction efficiency can be easily increased. Therefore, it is easy to increase the light extraction efficiency even when the light source is relatively large or the substrate is relatively small.
- the sealing member 40 is formed in two stages, and the phosphor 50 excited by the light emitted from the light emitting element 10 is limited to the first sealing portion 401 in the lower layer.
- the first sealing portion 401 covers all the light emitting elements 10 and is filled up to the upper surface of the recess 31. Thereby, the inside of the 1st sealing part 401 is made into a surface light source.
- the first sealing portion 401 may contain a diffusing agent.
- the upper second sealing portion 402 is formed so that at least a part of the sealing rising surface 37 is the outward surface 38 of the protrusion 33, and has a highly convex surface 45 (452). . Thereby, a light-emitting device with a high luminous flux can be obtained.
- the protrusion 33 is provided in a rectangular frame shape with rounded corners along the outline of the recess 31 in the top view of the base body 30. It is preferable that at least the corners of the protrusions or the grooves are curved as described above in the top view of the base body or the entire shape as in the perfect circle shape described in the first and second embodiments.
- the protrusion or the groove is bent and bent in a top view of the substrate, the surface of the sealing member rising from the vicinity of the corner is distorted.
- the protrusion or the groove does not necessarily have to be provided along the outline of the concave portion.
- an annular protrusion or groove may be provided for the rectangular concave portion.
- the coating 60 having a critical surface tension of 50 mN / m or less is limited to the outward surface 38 on which the sealing rising surface 37 of the base body 30 is provided and the constituent surface outside the outward surface 38. Is formed.
- the contact angle of the sealing member 40 contact angle ⁇ of the droplet L in FIG. 3 is the substrate (FIG. 2). Then, it becomes so large that the surface tension of the outward surface 37 (solid S of FIG. 3) of the molded object 25) is small.
- the sealing member 40 Before dropping the sealing member onto the substrate, only the outward surface on which the sealing upright surface of the substrate is provided, or the outward surface on which the sealing upstanding surface of the substrate is provided and the configuration outside the outward surface By forming a film having a small surface tension only on the surface, the surface of the sealing member can easily rise from the outward surface. Thereby, the surface of the sealing member 40 can be easily formed into a convex surface that protrudes high, and the light extraction efficiency can be easily increased. Further, by limiting the range in which the coating film 60 is provided in this way, the sealing member 40 is in direct contact with the surface of the base body 30 on the inner side of the outwardly facing surface 38, and thus the high adhesion between the base body 30 and the sealing member 40.
- the molded body 25 is preferably made of a material having a critical surface tension of more than 50 mN / m because cohesive force for securing solder heat resistance and adhesion between the sealing member 40 are necessary.
- the coating 60 is preferably made of a material having a critical surface tension of 50 mN / m or less. Specific materials for the coating 60 include a fluororesin material and a silicone material. Among these, silicone oil is preferable because it is absorbed by the sealing member during the solidification of the sealing member and hardly deteriorates the adhesion with the substrate.
- FIG. 6 (a) is a schematic top view of the light emitting device according to Embodiment 4, and FIGS. 6 (b) and 6 (c) show a DD section and an EE section in FIG. 6 (a), respectively. It is a schematic sectional drawing shown.
- the light emitting device 400 of the example shown in FIG. 6 seals the light emitting element 10, the base member 30 having the conductive member 20 to which the light emitting element 10 is connected and the molded body 25 integrally formed with the conductive member 20, and the light emitting element 10. Sealing member 40 to be provided.
- the base 30 is a package having a pair of positive and negative lead frame conductive members 20 and a resin molded body 25 that integrally holds the conductive members.
- the base body 30 includes a recess 31 on the upper surface side. A part of the bottom surface of the recess 31 is constituted by a part of the surface of the conductive member 20. A terminal portion for external connection of the conductive member 20 is provided to extend on the end face of the molded body 25.
- the light emitting element 10 is an LED chip, and is bonded to the bottom surface of the recess 31 of the base with an adhesive (not shown) and connected to the conductive member 20 with a wire.
- the sealing member 40 is a sealing resin provided on the base 30 so as to cover the light emitting element 10.
- the lower surface (back surface) of the substrate 30 is the mounting surface.
- the light emitting device 400 of the example shown in FIG. 6 has an end surface (side surface) of the base 30 as a mounting surface, and a vertical direction (y direction in the figure) substantially perpendicular to the end surface serving as the mounting surface is mounted. It becomes the thickness (height) direction.
- Such a light emitting device 400 is installed on the side of the light guide plate as a light source for a backlight of a liquid crystal display, for example. Therefore, the base body 30 has a vertically long and horizontally long shape in a top view in order to reduce the thickness, and accordingly, the recess 31 has a similar shape.
- the sealing member 40 is shaped so that at least a part of the sealing standing surface 37 is an outward surface 38 of the protrusion 33. As a result, at least in the lateral direction, the surface of the sealing member 40 can be formed into a highly projecting convex surface, and the light extraction efficiency can be increased.
- the protrusions or grooves are not limited to the frame shape, and may be provided in a band shape. Thereby, it is easy to form a protrusion or a groove in a small size, and it is easy to provide an outward surface in a small area inside the outermost end surface of the base. In that case, it is preferable that at least two protrusions or grooves are provided so as to sandwich the light emitting element. Then, since the surface of the sealing member is easily formed from the protrusion to the protrusion or from the groove to the groove, the symmetry of the surface shape of the sealing member can be enhanced. In addition, a plurality of protrusions or grooves may be provided apart from each other as shown by a broken line, and may be further scattered.
- FIG. 7A is a schematic top view of the light-emitting device according to Embodiment 5, and FIG. 7B is a schematic cross-sectional view showing the FF cross section in FIG. 7A.
- the light emitting device 500 of the example shown in FIG. 7 has substantially the same configuration as the light emitting device of the above-described fourth embodiment except for the shapes of the recess 31 and the protrusion 33.
- the shape of the recess 31 in a top view is rectangular, which is excellent in that the opening area of the recess 31 can be easily widened.
- the top view shape of the recess 31 is a shape (oval shape) in which semicircles are combined on both sides (left and right) of the rectangle.
- the protrusion 33 is formed in the strip
- the corners or the whole of the base body 30 is curved in a top view.
- FIG. 8A is a schematic top view of the light-emitting device according to Embodiment 6, and FIG. 8B is a schematic cross-sectional view showing a GG section in FIG. 8A.
- the light emitting device 600 of the example shown in FIG. 8 encloses the light emitting element 10, the wiring board 22 on which the light emitting element 10 is placed, and the base 30 having the protrusions 34 provided on the upper surface of the wiring board 22, and the light emitting element 10. Sealing member 40 to be stopped.
- the base body 30 includes a wiring board 22 having wiring electrodes on the upper surface, and a protrusion 34 that is a white resin molded body provided in a frame shape on the upper surface.
- the light emitting element 10 is an LED chip, and a plurality of light emitting elements 10 are bonded to the inside of the protrusion 34 on the upper surface of the wiring substrate 22 with an adhesive (not shown), and are connected to the wiring electrodes with wires.
- the sealing member 40 is a sealing resin provided on the base 30 so as to cover the light emitting element 10. In particular, in this example, the sealing member 40 is divided into two parts, and the phosphor 50 is excited only by the light emitted from the light emitting element 10 only in the first sealing part 401 in the lower layer. Contains.
- the first sealing portion 401 covers all the light emitting elements 10 and is filled up to substantially the top of the protrusion 34. Thereby, the inside of the 1st sealing part 401 is made into a surface light source. Note that the first sealing portion 401 may contain a diffusing agent.
- the surface of the sealing member 40, and the surface of the 2nd sealing part 402 of the upper layer more specifically, protrudes upwards from the base
- at least a part, and most preferably all, of the seal rising surface 37 is an outward surface 27 facing outward in the top view of the protrusion 34.
- FIGS. 9A to 9E are schematic cross-sectional views showing an example of a method for manufacturing the light emitting device according to Embodiment 6.
- FIGS. The light emitting device 600 shown in FIG. 8 is manufactured through the following processes.
- the first step of forming a base by providing a protrusion on the upper surface of the wiring substrate on which the light emitting element is mounted, and the sealing member for sealing the light emitting element are formed.
- the manufacturing method described here is merely an example as long as it includes at least the second step.
- the light emitting element 10 is mounted on the wiring board 22. Specifically, the light emitting element 10 is bonded to the wiring board 22 with an adhesive, and further connected to the wiring electrodes of the wiring board 22 with wires.
- the wiring substrate 22 a composite substrate capable of forming a plurality of light emitting devices is used.
- the base 30 is formed by providing protrusions 34 on the upper surface of the wiring board 22.
- a constituent material of the protrusion 34 in a fluid state (liquid, sol, or slurry) is dropped on the upper surface of the wiring substrate 22 and drawn in a frame shape so as to surround the light emitting element 10. It is solidified by heating or cooling. Note that the order of the light emitting element mounting step and the protrusion forming step may be reversed.
- the sealing member 40 is formed on the base body 30.
- the sealing member is formed by dropping (potting).
- the dropping method is an inexpensive molding method that does not use a molding machine or a mold as compared with a compression molding method, a transfer molding method, an injection molding method, or a casting molding method. Further, in the dropping method, the flow of the constituent material of the sealing member at the time of forming the sealing member is small, and deformation of the wire can also be suppressed.
- the sealing member 40 in a fluid state liquid, sol, or slurry
- a fluid state liquid, sol, or slurry
- the stop member 40 is solidified by heating or cooling. At this time, the sealing member 40 is formed so that at least a part of the sealing standing surface 37 is the outward surface 27 of the protrusion 34. In other words, the sealing member 40 is formed such that at least a part of the surface 45 rises from the outward surface 27 of the protrusion 34. As described above, the angle formed between the tangent to the surface 45 of the sealing member 40 (at the contact point between the outward surface 27 and the edge of the sealing member 40) and the outward surface 27 is a substantially contact angle.
- the constituent material of the first sealing portion 401 containing the phosphor 50 is dropped on the inside of the protrusion 34, and then the constituent material of the second sealing portion 402 is dropped thereon.
- the second sealing portion 402 may be formed after the first sealing portion 401 is completely solidified, but the first sealing portion 401 is formed in a semi-solidified state or an unsolidified state, The adhesion between the sealing portion 401 and the second sealing portion 402 can be improved.
- the sealing member 40 may be solidified with the base body 30 turned upside down, that is, with the upper surface of the base body 30 onto which the sealing member 40 is dropped facing downward in the vertical direction. If it does so, the sealing resin 40 can be solidified in the state which the sealing resin 40 in the state which has fluidity
- the wiring board 22 (composite board) is cut to separate the light emitting device 600 into pieces.
- the base body 30 may be separated into pieces, or the wiring substrate 22 separated into pieces for a single light emitting device from the beginning may be used.
- the sealing member is provided on the base as described above, the surface of the sealing member can be relatively stably formed on the projecting surface, and the light extraction efficiency can be sufficiently increased. .
- the contact angle ⁇ of the sealing member 402 is determined by the surface tension of the sealing member 402, It is determined by the surface tension of the base body 30 (specifically, the protrusion 34) on which the edge of the sealing member 402 is provided and the interfacial tension between the sealing member 402 and the base body 30 (protrusion 34).
- the sealing member 402 is provided on the outward surface 27 of the protrusion 34, the tangent to the surface 45 of the sealing member (at the contact point between the outward surface 27 and the edge of the sealing member), the outward surface 27, and Is approximately the contact angle ⁇ , but the angle formed between the tangent to the surface 45 of the sealing member and the horizontal plane can be greater than the contact angle ⁇ . That is, the sealing member 40 is formed such that at least a part of the sealing rising surface 37 is the outward surface 27 of the projection 34, so that the surface 45 of the sealing member starts in the vertical direction from the outward surface 27. Easier to get up.
- the surface of the sealing member 40 can be easily formed into a highly protruding convex surface, preferably a convex curved surface, and thus a substantially spherical surface. Moreover, the surface shape can be obtained with good reproducibility. Therefore, a light emitting device having excellent light extraction efficiency can be manufactured at low cost.
- the sealing member is also possible to form the sealing member with a highly projecting convex surface by forming the sealing member by dropping after forming a film having a small surface tension over the entire upper surface of the substrate.
- the adhesion between the base and the sealing member may be significantly reduced due to the coating interposed between the base and the sealing member.
- the sealing member is basically in direct contact with the surface of the base, and high adhesion between the base and the sealing member is obtained. Can be provided.
- the edge of the sealing member acts so as to be locked to the protrusion, and the adhesion between the base and the sealing member can be further enhanced. .
- the outward surface 27 of the protrusion 34 is a convex curved surface.
- the sealing member having fluidity is dropped onto the base and reaches the edge formed by the outward surface of the protrusion and the surface continuous above the protrusion.
- the sealing member is temporarily accumulated on the upper surface of the outer surface due to the above-described “wetting pinning effect”. .
- a sealing member gets over the edge part, there exists a possibility of flowing out vigorously by the weight of itself enlarged and destroying the surface shape.
- the outward surface of the protrusion has a convex curved surface at the top, as described above, the “wetting pinning effect” can be suppressed and the sealing member can be smoothly moved onto the outward surface. .
- the surface of the sealing member 40 can be easily and stably formed on a convex surface that protrudes highly.
- at least a part of the sealing standing surface 37 may be a convex curved surface on the outward surface 27, or may be a surface that extends beyond the convex curved surface and continues to the lower side thereof.
- the outward surface 27 is preferably a convex curved surface or a lower surface continuous with the convex curved surface.
- the uppermost surface of the outward surface 27 of the protrusion 34 is formed as a convex curved surface, thereby suppressing the chipping of the protrusion 34 due to biting into the mold and the moldability of the protrusion 34. Can be increased.
- the inward surface 29 facing the inner side in the top view of the protrusion 34 is a convex curved surface.
- the sealing member in a fluid state is dropped on the base and reaches an edge portion formed by an inward surface of the protrusion and a surface continuous thereabove.
- the inward surface of the protrusion is a flat surface bent from the upper surface, the sealing member is temporarily accumulated on the inward surface due to the “wetting pinning effect” described above.
- a sealing member gets over the edge part there exists a possibility of flowing out vigorously by the weight of itself enlarged, and also flowing out beyond an outward surface.
- the inward surface 29 of the protrusion 34 has a convex curved surface at the uppermost position, as described above, the “wetting pinning effect” is suppressed, and the surface of the sealing member 40 that is continuous to the upper side thereof is extended outward. It can be moved smoothly onto the surface 27. As a result, the surface of the sealing member 40 can be easily and stably formed on a convex surface that protrudes highly.
- at least a part, most preferably all, of the inwardly facing surface 29 of the constituent surface of the base body 30 located on the inner side of the sealing standing surface 37 and facing the inner side of the projection as viewed from above is projected to the uppermost position. It is preferable to have a curved surface.
- the protrusion 34 is provided in an annular shape surrounding the light emitting element 10 when viewed from above.
- the protrusion 34 provides an outward surface 27 for raising the surface 45 of the sealing member, and functions as a barrier for blocking the sealing member 40 in a fluid state.
- the protrusion is provided in a frame shape surrounding the light emitting element.
- the protrusion 34 is preferably provided in an annular shape in a top view, and in particular, is preferably provided in an elliptical shape, and more preferably provided in a perfect circular shape.
- the surface of the sealing member 40 can be formed in a convex surface with little distortion, light extraction efficiency can be easily improved, and light distribution excellent in symmetry can be obtained.
- the protrusions 34 are arranged so that the light emitting element 10 is substantially at the center, thereby improving the symmetry of light distribution.
- FIG. 10A is a schematic top view of the light-emitting device according to Embodiment 7, and FIG. 10B is a schematic cross-sectional view showing the HH cross section in FIG.
- the light emitting device 700 of the example shown in FIG. 10 encloses the light emitting element 10, the substrate 30 on which the light emitting element 10 is placed, the base 30 having the protrusions 34 provided on the upper surface of the wiring board 22, and the light emitting element 10. Sealing member 40 to be stopped.
- the base body 30 includes a wiring substrate 22 having wiring electrodes on the upper surface, a first protrusion 341 provided on the upper surface, and a second protrusion 342 on the outer side.
- the first and second protrusions 341 and 342 are white resin molded bodies formed in a predetermined shape in advance, and are bonded to the upper surface of the wiring board 22 with an adhesive.
- the light emitting element 10 is an LED chip, and one is bonded inside the protrusion 34 on the upper surface of the wiring substrate 22 with an adhesive (not shown), and is connected to the wiring electrode by a wire.
- the sealing member 40 is a sealing resin provided on the base 30 so as to cover the light emitting element 10.
- the first protrusion and the second protrusion outside the first protrusion are provided on the upper surface of the wiring substrate, and in the second step, at least a part of the sealing standing surface is provided.
- the surface 45 of the sealing member can be raised from the outward surface 27 of any one of the protrusions 341 and 342.
- the surface of the member 40 can be formed into a convex surface that protrudes highly.
- the first protrusion 341 is provided outside the wire connection portion to which the wire of the wiring electrode of the wiring substrate 22 is connected, thereby suppressing or avoiding the distortion of the surface shape of the sealing member 40 due to the wire. Can do.
- the first protrusion 341 may be provided on the inner side of the wire connection portion to which the wire of the wiring electrode of the wiring board 22 is connected. Thereby, it can suppress that the wire connection part of the wiring electrode of the wiring board 22 is contaminated with the oozing-out component of the adhesive which adhere
- the sealing member 40 includes a first sealing portion 401 that seals the light emitting element 10, and a second sealing portion 402 that seals the first sealing portion 401. It is equipped with.
- the first sealing portion 401 includes at least a part of the first sealing rising surface 371 where the surface 451 of the first sealing portion rises among the constituent surfaces of the base body 30, and the outward surface 27 of the first protrusion 341. It is formed as follows.
- the second sealing portion 402 has at least a part of the second sealing rising surface 372 on which the surface 452 of the second sealing portion rises among the constituent surfaces of the base body 30, and the outward surface 27 of the second protrusion 342. It is formed as follows.
- each sealing portion can be formed relatively stably on a convex surface that protrudes highly. It is easy to suppress the reflection of light at the interface of the sealing portion and increase the light extraction efficiency.
- each sealing portion may be made of the same material and have the same refractive index, but from the light emitting element 10 by gradually making the refractive index of each sealing portion closer to the refractive index of air. Light can be efficiently extracted into the sealing member 40, and reflection of light at the interface between the two sealing portions can be suppressed to further increase the light extraction efficiency.
- the refractive index of the second sealing portion 402 is preferably lower than the refractive index of the first sealing portion 401.
- the second sealing portion 402 may be formed after the first sealing portion 401 is completely solidified, but by forming the first sealing portion 401 in a semi-solidified or non-solidified state, The adhesion between the first sealing portion 401 and the second sealing portion 402 can be improved. Further, since the first sealing portion 401 is an internal region of the sealing member 40, the first sealing portion 401 may be formed using the above-described “wetting pinning effect”. In this case, the surface 451 of the first sealing portion 401 rises from the end of the upper surface serving as a boundary with the outward surface 27 of the first protrusion 341.
- the sealing member 40 contains the phosphor 50 excited only by the light emitted from the light emitting element 10 only in the first sealing portion 401.
- the wavelength conversion and scattering of light by the phosphor 50 is performed only in the first sealing portion 401, that is, in the vicinity of the light emitting element 10 in the sealing member 40.
- the light source can be made smaller with respect to the surface of the sealing member, and the light extraction efficiency can be increased.
- the surface of the first sealing portion 401 can be formed as a convex surface that protrudes high, variation in the optical path length in each direction within the first sealing portion 401 can be reduced, and the first sealing portion 401 can be reduced. Even if the phosphor 50 is dispersed in 401, it is possible to emit light with substantially uniform chromaticity.
- the fluorescent substance 50 may be settled and a diffusing agent may be contained.
- the uppermost surface of the outward surface 27 of the first protrusion 341 is a flat surface.
- the outwardly facing surface 27 of the protrusion is most preferably a convex curved surface, but the descending from the upper plane continuous with the outwardly facing surface.
- An angle (tilt angle) may be a plane preferably 45 degrees or less, more preferably 30 degrees or less.
- the “upper plane continuous with the outward surface” is not limited to the substantially horizontal upper surface of the protrusion, and may be an outward surface. That is, the outward surface 27 of the protrusion may be configured by a plurality of planes in which the descending angle of the lower plane from the upper plane is preferably 45 degrees or less, more preferably 30 degrees or less.
- the angle formed by the outward surface 27 of the second protrusion 342 and the upper surface of the wiring board 22 is an acute angle.
- the outward surface 27 of the second protrusion 342 is inclined so as to face the upper surface of the wiring board 22.
- the protrusion separately provided on the wiring board can be formed in advance as a separate body from the wiring board, its shape and material can be easily selected. Further, the edge portion can be processed with high accuracy.
- the protrusion that makes an acute angle between the outward surface of the protrusion and the upper surface of the wiring board can be easily provided, and the surface of the sealing member 40 can be easily protruded high.
- the angle formed by the outward surface of the protrusion serving as the sealing standing surface and the upper surface of the wiring board is preferably 30 to 135 degrees, and preferably 45 to 90 degrees. It is more preferable. Thereby, the surface of the sealing member is easily protruded and formed, and the light extraction efficiency is easily increased.
- the second protrusion 342 is provided in a rectangular frame shape with rounded corners when viewed from above. It is preferable that at least the corners of the protrusions are curved as described above in the top view or like the annular shape shown in the sixth embodiment.
- the protrusion is angularly bent when viewed from above, the surface of the sealing member rising from the vicinity of the corner is distorted.
- at least the corners of the protrusions are curved, so that the distortion can be reduced, the surface of the sealing member can be easily formed into a relatively smooth convex surface, and the light extraction efficiency can be easily improved.
- a coating 60 having a critical surface tension of 50 mN / m or less is formed on the outward surface 27 of the second protrusion 342 provided with the sealing upright surface 372.
- the contact angle of the sealing member 402 (contact angle ⁇ of the droplet L in FIG. 3) is outside the protrusion 34. The smaller the surface tension of the surface 27 (solid S in FIG. 3), the larger the surface tension.
- the sealing member 40 is in direct contact with the surface of the base 30 on the inner side of the outward surface 27 by limiting the range in which the coating 60 is provided in this way, the high adhesion between the base 30 and the sealing member 40 is achieved. Can be maintained.
- the material for the coating 60 include silicone oil, paraffinic hydrocarbon, higher alcohol, higher fatty acid, silicone resin, fluororesin, polyolefin resin, polynorbornene resin, and the like.
- silicone oil is preferable because it is absorbed by the sealing member during the solidification of the sealing member and hardly deteriorates the adhesion with the substrate.
- the number of protrusions is not particularly limited.
- the protrusion may remain outside the sealing standing surface.
- a third protrusion 343 may be further provided outside the second protrusion 342 on the upper surface of the wiring substrate 22 as indicated by a one-dot chain line in FIG. Then, the inward surface of the third protrusion 343 comes to face the outward surface 27 of the second protrusion 342 provided with the sealing rising surface 372. Thereby, the light emitted from the edge of the sealing member provided on the outward surface 27 of the second protrusion 342 can be effectively reflected by being reflected by the inward surface of the third protrusion 343 toward the front of the apparatus. .
- the inward surface facing the outward surface on which the sealing standing surface is provided is inclined so as to open upward or is curved in such a manner. Thereby, the light radiate
- one sealing portion (first sealing portion 401) is provided so as to be included in one sealing portion (second sealing portion 402).
- the present invention is not limited to this, and when a plurality of projections and a plurality of sealing portions where at least part of the surface rises from the outward surface of the projections are provided, the plurality of sealing portions are included in one sealing portion. May be provided.
- the plurality of inner sealing portions seal light emitting elements emitting red, green, and blue colors, respectively.
- FIG. 11A is a schematic top view of the light-emitting device according to Embodiment 8, and FIG. 11B is a schematic cross-sectional view showing a JJ cross section in FIG.
- the light emitting device 800 of the example shown in FIG. 11 encloses the light emitting element 10, the wiring substrate 22 on which the light emitting element 10 is placed, and the base 30 having the protrusions 34 provided on the upper surface of the wiring substrate 22, and the light emitting element 10. Sealing member 40 to be stopped.
- the base body 30 is made of a white resin provided in a straight line extending in the vertical direction (y direction in the figure) on the left and right of the light-emitting element 10 on the upper surface of the wiring substrate 22 having wiring electrodes on the upper surface.
- a projection 34 which is a molded body.
- the light emitting element 10 is one LED chip, and is bonded to the wiring electrode with a conductive adhesive inside the protrusion 34 on the upper surface of the wiring substrate 22.
- a covering member (first covering member) 70 is provided below the light emitting element 10, that is, between the light emitting element 10 and the wiring board 22.
- the covering member 70 is a white resin. Thereby, the light radiate
- the light emitting device 800 of this example includes a wavelength converter that includes a phosphor provided on the light emitting element 10 and excited by light emitted from the light emitting element 10.
- a member 55 may be provided.
- the wavelength conversion member 55 has, for example, a plate shape and is attached to the upper surface of the light emitting element 10.
- the light emitting device 800 of this example includes a covering member (second covering member) 75 that covers the upper surface of the wiring substrate 22 around the light emitting element 10. Also good.
- the covering member 75 is provided in various covering forms.
- the covering member 75 covers at least a part of the upper surface of the wiring board 22. If the covering member 75 is made of a light-reflective member such as a white material, the light emitted from the light emitting element 10 can be suppressed from being absorbed by the wiring substrate 22 and the light extraction efficiency can be increased.
- the covering member 75 may be provided on the outer side of the projection 34, but is preferably provided on the inner side of the projection 34, particularly on the inner side of the projection 34 on which the sealing standing surface 37 is provided. When a plurality of protrusions are provided, the covering member 75 may be provided between the protrusions. If the wiring electrode is covered with the covering member 75 having a gas barrier property higher than that of the sealing member 40, discoloration of the wiring electrode due to corrosive gas can be suppressed, and high light extraction efficiency can be easily maintained. In addition, the covering member 75 may be provided by exposing the upper surface of the light emitting element 10 and covering the side surface of the light emitting element.
- the covering member 75 may be provided so that the upper surface of the wavelength conversion member 55 is exposed and the side surfaces of the light emitting element 10 and the wavelength conversion member 55 are covered. Accordingly, when the covering member 75 is a light reflective member, a light source having the main light extraction surface on the upper surface of the light emitting element 10 or the upper surface of the wavelength conversion member 55 is obtained.
- the sealing member 40 is a sealing resin provided on the base 30 so as to cover the light emitting element 10 (or a composite light source in the case where the wavelength conversion member 55 is provided).
- the surface of the sealing member 40 is a convex surface rising from the outward surface 27 of the left and right protrusions 34 in a cross section (xz plane) perpendicular to the y direction, and a cross section (yz plane) parallel to the y direction. ),
- the both end surfaces are rectangular surfaces substantially flush with the end surface of the wiring board 22. That is, the sealing member 40 is provided in a substantially semi-cylindrical shape having such a surface shape.
- the protrusion 34 is provided in a strip shape, at least a part of the surface 45 of the sealing member rises from the outward surface 27 of the protrusion 34 in a cross section perpendicular to the extending direction (y direction). And the surface of the sealing member 40 can be formed in the convex surface which protruded highly, and the extraction efficiency of light can be improved.
- the protrusion is not limited to the frame shape, and may be provided in a band shape. Thereby, it is easy to form a projection in a small size, and it is easy to provide an outward surface in a small area inside the outermost end surface of the wiring board.
- one protrusion may be provided, but at least two protrusions are preferably provided so as to sandwich the light emitting element. Then, since the surface of the sealing member is easily formed from the protrusion to the protrusion, the symmetry of the surface shape of the sealing member can be enhanced. Further, a plurality of protrusions may be provided so as to be spaced apart as indicated by a broken line, or may be further provided in the form of dots.
- FIG. 12 (a) to 12 (d) are schematic views showing an example of the method for manufacturing the light emitting device according to Embodiment 8, each including a top view and a cross-sectional view taken along a two-dot chain line.
- the light emitting device 800 shown in FIG. 11 is manufactured through the following steps.
- the light emitting element 10 is mounted on the wiring board 22. Specifically, the light emitting element 10 is bonded to the wiring electrode of the wiring board with a conductive adhesive. At this time, the number of the light emitting elements 10 may be one, but it is preferable that the plurality of light emitting elements 10 are arranged in one direction (y direction in the figure). The number of columns may be one or more.
- the wiring substrate 22 is a composite substrate capable of forming a plurality of light emitting devices.
- the protrusions 34 are provided on the upper surface of the wiring substrate 22 to form the base body 30. Specifically, the constituent material of the projection 34 having fluidity is dropped on the upper surface of the wiring substrate 22 and drawn into a predetermined shape, and then solidified. At this time, the protrusion 34 is provided in a strip shape extending in a direction substantially parallel to the arrangement direction (y direction in the drawing) of the light emitting elements 10. Further, the protrusions 34 are provided on both sides of the light emitting element 10.
- the “strip shape” as used herein includes a case where it is partially, and includes a frame-like protrusion. The order of the light emitting element mounting step and the protrusion forming step may be reversed.
- the sealing member 40 is formed on the base 30 by dropping. Specifically, the sealing member 40 in a fluid state is dropped onto the base 30 so as to cover the light emitting element 10 using a dispenser or the like, and the sealing member 40 is solidified by heating or cooling. At this time, the sealing member 40 is formed so that at least a part of the sealing standing surface 37 is the outward surface 27 of the protrusion 34. In other words, the sealing member 40 is formed such that at least a part of the surface 45 rises from the outward surface 27 of the protrusion 34. In addition, the sealing member 40 is preferably provided across the protrusions 34 on both sides in order to enhance the symmetry of the surface shape.
- the sealing member 40 may be solidified with the base body 30 turned upside down, that is, with the upper surface of the wiring board 22 onto which the sealing member 40 has been dropped facing downward in the vertical direction.
- the surface of the sealing member 40 can be made to protrude highly using gravity.
- the surface of the sealing member 40 can be formed to extend in the vertical direction for a long time, and a light emitting device with good directivity and high luminous intensity can be obtained.
- a projection that is inclined so that the outward surface faces the upper surface of the wiring board, such as the second projection 342 of the seventh embodiment can easily hold a relatively large amount of sealing member, and can be sealed.
- the sealing member 40 may be solidified in a normal posture, that is, in a state where the upper surface of the wiring board 22 is directed upward in the vertical direction.
- the wiring board 22 and the sealing member 40 between the light emitting elements are cut, and the light emitting device 800 is separated into pieces. At this time, it is preferable to cut the wiring board 22 and the sealing member 40 in a direction substantially orthogonal to the arrangement direction of the light emitting elements 10.
- the light emitting device 800 of the example shown in FIG. 11 can be manufactured with high productivity.
- the cutting positions of the wiring board 22 and the sealing member 40 can be arbitrarily changed.
- one light-emitting device is cut so that one light-emitting element is included, but one light-emitting device may be cut so that a plurality of light-emitting elements are included.
- the projections 34 on both sides are open, the surface shape of the end portion of the sealing member 40 in a direction substantially parallel to the extending direction of the projection 34 is easily distorted. It may be excised.
- the wiring board 22 and the sealing member 40 can be used as a relatively large light emitting device without being cut.
- the belt-like protrusion 34 is not limited to a straight line, and may be provided in a curved shape such as a curved line or a wavy line. At this time, it is preferable that an antinode of a wave protruding outward is located next to the light emitting element 10. Thereby, even in a cross section substantially parallel to the arrangement direction of the light emitting elements 10, the surface of the sealing member 40 can be partially formed as a convex surface, and the light extraction efficiency can be easily improved. Furthermore, it is more preferable that the protrusions 34 are provided so as to be substantially symmetrical with respect to the light emitting element 10.
- Light emitting element 10 As the light emitting element, a semiconductor light emitting element such as an LED element or an LD element can be used.
- the light emitting element may be any element in which a pair of positive and negative electrodes is provided in an element structure composed of various semiconductors.
- a light-emitting element of a nitride semiconductor In x Al y Ga 1-xy N, 0 ⁇ x, 0 ⁇ y, x + y ⁇ 1
- light emitting elements of gallium arsenide and gallium phosphorus semiconductors that emit green to red light may be used.
- the mounting form may be face-up mounting in which each electrode is connected to a conductive member or a wiring electrode of a wiring board by a wire
- Face-down (flip chip) mounting connected to a conductive member or a wiring electrode of a wiring board with a conductive adhesive may also be used.
- a light emitting element having a counter electrode structure in which a pair of positive and negative electrodes are provided on opposite surfaces may be used.
- the number of light-emitting elements mounted on one light-emitting device may be one or more, and the size, shape, and emission wavelength may be arbitrarily selected.
- red, green, and blue light emitting elements may be mounted on one light emitting device.
- the plurality of light emitting elements may be irregularly arranged, but a preferable light distribution can be easily obtained by arranging regularly or periodically such as a matrix or a concentric circle.
- the plurality of light emitting elements can be connected in series or in parallel by a conductive member, a wiring electrode of a wiring board, a wire, and the like.
- the base is a member serving as a base on which the light emitting element is placed.
- the base is mainly composed of a conductive member and a molded body integrally formed therewith.
- the base is mainly composed of a wiring board and a protrusion provided on the upper surface thereof.
- the substrate may be in the form of a plate having no recess (side wall) in addition to the recess having a part of the conductive member on the bottom surface.
- Conductive member 20 As the conductive member, a metal member that is electrically connected to the light emitting element can be used. Specific examples include lead frames and wiring electrodes formed of copper, aluminum, gold, silver, tungsten, iron, nickel, cobalt, molybdenum, or alloys thereof, phosphor bronze, iron-containing copper, and the like. Further, the surface layer may be provided with a plating such as silver, aluminum, rhodium, gold, copper, or an alloy thereof, or a light reflection film, and among them, silver that is most excellent in light reflectivity is preferable.
- a plating such as silver, aluminum, rhodium, gold, copper, or an alloy thereof, or a light reflection film, and among them, silver that is most excellent in light reflectivity is preferable.
- the base material of the molded body is aliphatic polyamide resin, semi-aromatic polyamide resin, polyethylene terephthalate, polycyclohexane terephthalate, liquid crystal polymer, polycarbonate resin, syndiotactic polystyrene, polyphenylene ether, polyphenylene sulfide, polyether sulfone resin, polyether ketone.
- Thermosetting resins such as thermoplastic resins such as resins and polyarylate resins, polybismaleimide triazine resins, epoxy resins, silicone resins, silicone modified resins, silicone modified resins, polyimide resins, and polyurethane resins.
- glass silica, titanium oxide, magnesium oxide, magnesium carbonate, magnesium hydroxide, calcium carbonate, calcium hydroxide, calcium silicate, magnesium silicate, wollastonite, Mica, zinc oxide, barium titanate, potassium titanate, aluminum borate, aluminum oxide, zinc oxide, silicon carbide, antimony oxide, zinc stannate, zinc borate, iron oxide, chromium oxide, manganese oxide, carbon black, etc. Particles or fibers can be incorporated.
- the molded body can be formed of glass, ceramics, or the like.
- the wiring board is made of various substrates such as glass epoxy, glass, ceramics, various resins, aluminum, etc., which are provided with wiring electrodes and circuit components that are connected to the light emitting element and the terminal part (pad part) for external connection. It can.
- the ceramic alumina, aluminum nitride, mullite, silicon carbide, silicon nitride and the like are preferable.
- the resin epoxy resin, polyimide resin, phenol resin, BT resin, polyphthalamide resin (PPA), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT) and the like are preferable.
- As the wiring electrode a metal member that is electrically connected to the light emitting element can be used.
- the wiring electrode is formed of copper, aluminum, gold, silver, tungsten, iron, nickel, cobalt, molybdenum, or an alloy thereof, phosphor bronze, iron-containing copper, or the like.
- the wiring electrode may be exposed on the upper surface, the lower surface (back surface), and the side surface of the substrate, or may be provided inside the substrate.
- the wiring electrode exposed on the upper surface of the substrate may be provided with a plating or light reflecting film such as silver, aluminum, rhodium, gold, copper, or an alloy thereof on the surface layer. Silver with excellent properties can be used.
- the wiring board may be provided with a recess or a hole at a position where the protrusion is provided, and the adhesion between the wiring board and the protrusion is improved by filling or locking a part of the protrusion in the recess or hole. Can be increased.
- the concave portion or the hole is provided in, for example, a dot shape or a line shape in a top view.
- the opening diameter of a recessed part or a hole is smaller than the width
- the protrusion is mainly provided on the upper surface of the wiring board as a member that provides an outward surface for raising the surface of the sealing member.
- the protrusion is usually provided outside the light emitting element, but may be provided below the light emitting element (in other words, the light emitting element may be provided on the protrusion).
- the protrusion also functions as a light reflector that reflects upward the light emitted from the light emitting element to the side on the inner wall surface. Therefore, a white member having excellent light reflectivity is preferable, and one that is electrically insulated from the wiring electrode of the wiring board is preferable.
- the protrusion is a member having excellent translucency, such as substantially transparent, the light distribution of the light emitting device can be widened.
- thermosetting resin a thermoplastic resin, or the like
- silicone resin epoxy resin, phenol resin, BT resin, PPA, PET, PBT, fluororesin, polyolefin resin, polynorbornene resin, and the like
- particles of titanium oxide, aluminum oxide, zirconium oxide, magnesium oxide, or the like are added to the resin as the base material, whereby light can be reflected efficiently.
- protrusions are solidified after being discharged onto the wiring board by a dispenser or the like, for example.
- the protrusion can be provided by fixing a member formed in an arbitrary shape to the wiring board.
- the surface of the protrusion is preferably made of a material having a critical surface tension of 50 mN / m or less.
- silicone resins, fluororesins, polyolefin resins, and polynorbornene resins are particularly preferable, and among them, silicone resins having excellent heat resistance and light resistance and relatively good adhesion are preferable.
- the protrusion may be composed of a single layer, but may be composed of a plurality of layers.
- the sealing member is a member that seals part of the light emitting element, the wire, and the conductive member, and protects them from dust, moisture, external force, and the like.
- the base material of the sealing member may be any material that has electrical insulation, can transmit light emitted from the light-emitting element (preferably has a transmittance of 70% or more), and has fluidity before solidification.
- Specific examples include silicone resins, silicone-modified resins, silicone-modified resins, epoxy resins, phenol resins, polycarbonate resins, acrylic resins, TPX resins, polynorbornene resins, or hybrid resins containing one or more of these resins. Glass may be used.
- the base material of the sealing member is preferably mainly composed of phenyl silicone resin.
- the phenyl silicone resin when the surface of the sealing member is a convex surface, the phenyl silicone resin is more excellent in light extraction efficiency than the dimethyl silicone resin.
- the phenyl silicone resin is excellent in gas barrier properties and easily suppresses deterioration of the conductive member due to corrosive gas.
- the sealing member may include particles having various functions such as fillers and phosphors in the base material.
- a diffusing agent, a coloring agent, or the like can be used. Specifically, silica, titanium oxide, magnesium oxide, magnesium carbonate, magnesium hydroxide, calcium carbonate, calcium hydroxide, calcium silicate, zinc oxide, barium titanate, aluminum oxide, iron oxide, chromium oxide, manganese oxide, glass And carbon black.
- the shape of the filler particles may be crushed or spherical. Further, it may be hollow or porous.
- the phosphor absorbs at least part of the primary light emitted from the light emitting element, and emits secondary light having a wavelength different from that of the primary light.
- YAG yttrium-aluminum-garnet
- CaO—Al 2 O 3 —SiO 2 nitrogen-containing calcium aluminosilicate
- Examples thereof include silicate ((Sr, Ba) 2 SiO 4 ).
- a light emitting device that emits mixed light (for example, white light) of primary light and secondary light having a visible wavelength, or a light emitting device that emits visible light secondary light when excited by the primary light of ultraviolet light is used. Can do.
- wavelength conversion member 55 As the wavelength conversion member, a translucent member containing the above phosphor can be used. Specifically, a resin or glass molded body similar to the sealing member in which the phosphor is blended, a sintered body of the phosphor and an inorganic binder, a crystal of the phosphor, and the like can be given.
- the wavelength conversion member is formed in a plate shape, a film shape, or the like, and is bonded or directly bonded to the light emitting element with a light-transmitting adhesive, or a fluidized state is applied to the light emitting element, or
- the phosphor is provided by electrophoretic electrodeposition on a light emitting element and then impregnating it with a resin.
- the covering member is a member that covers the upper surface of the wiring substrate, the lower surface and the side surface of the light emitting element, and the like.
- the covering member is preferably a white member having electrical insulation that can efficiently reflect light emitted from the light emitting element.
- a resin similar to the protrusion or a resin to which particles similar to the protrusion are added can be used.
- the wire is a member that electrically connects the electrode of the light emitting element and the conductive member or the wiring electrode of the wiring board.
- a metal wire of gold, copper, silver, platinum, aluminum, or an alloy thereof can be used.
- a gold wire that is unlikely to break due to stress from the sealing member and is excellent in thermal resistance or the like is preferable.
- the adhesive is a member that fixes the light emitting element to the substrate or the wiring substrate.
- an epoxy resin, a silicone resin, a polyimide resin, or a modified resin or a hybrid resin thereof can be used.
- a conductive paste such as silver, gold or palladium, a solder such as gold-tin, or a brazing material such as a low melting point metal can be used.
- the light emitting device of Example 1 is a surface light emitting device (top view) having a base of 5.0 mm in length, 6.5 mm in width, and 1.35 mm in thickness having an outer shape similar to that of the light emitting device 100 in the example shown in FIG. ) Type surface mount type LED.
- the base is formed by integrally molding a molded body made of an epoxy resin containing a white pigment of titanium oxide and a silica filler on a conductive member which is a pair of positive and negative lead frames made of a copper alloy having a surface plated with silver. ,It is configured.
- Such a base is produced by installing a conductive member in a mold and injecting and solidifying the constituent material of the molded body. Note that a part of the surface of the conductive member constitutes a part of the bottom surface of the recess and extends to the outside of the molded body.
- a concave portion having a diameter of 4.3 mm and a depth of 0.85 mm in a top view is formed by a molded body.
- the concave portion is of a two-stage type, and has an upper step portion having a perfect circle shape with a width of 0.33 mm at a position having a depth of 0.3 mm. Further, a projection having a circular shape in a top view with a width of 0.16 mm and a height of 0.1 mm is formed on the upper stage portion.
- the upper portion is provided at a position having a depth of 0.2 mm, and a groove having a circular shape in a top view with a width of 0.17 mm and a depth of 0.1 mm is provided at the peripheral portion thereof.
- the outer side surface of the surface is an inclined surface having an inclination angle of 78 to 82 degrees from the upper surface.
- the corners formed by the outer and inner side surfaces and the upper surface of the protrusion are rounded and convex.
- the inward surface of the groove that is, the inner wall surface of the upper part of the recess is also inclined from the upper surface of the substrate to the same extent as the outer side surface of the protrusion.
- This light-emitting element has an n-type nitride semiconductor layer, an active layer, and a p-type layer sequentially stacked on a sapphire substrate, capable of emitting blue light (center wavelength of about 460 nm), 500 ⁇ m in length, 290 ⁇ m in width, and 120 ⁇ m in thickness. LED chip.
- the sealing member is provided so as to cover the light emitting element inside the concave portion of the base.
- This sealing member uses a phenyl silicone resin having a refractive index of 1.53 as a base material, and a YAG phosphor is dispersed therein.
- the surface of the sealing member has a substantially convex curved surface, most of which rises from the outer side surface, which is the outward surface of the protrusion of the base, or from the corner of the convex curved surface.
- the height of the surface of the sealing member (height near the apex) is 1.3 mm with the upper surface of the protrusion as the reference surface.
- Such a sealing member is molded by being dripped from the dispenser so that most of the surface rises from the outward surface of the protrusion of the base in a fluid state, and solidified by heating in that state. .
- Comparative Example 1 The light emitting device of Comparative Example 1 is the same as the light emitting device of Example 1 except that the surface of the sealing member is connected to the inward surface of the protrusion and is formed into a flat surface substantially flush with the upper surface of the protrusion. It is the same configuration.
- each light emitting device is caused to emit light at a forward current of 350 mA (parallel), and the luminous flux is measured.
- the luminous flux of the light emitting device of Comparative Example 1 is 119.8 [lm]
- the luminous flux of the light emitting device of Example 1 is 129.4 [lm].
- the luminous flux is 8.1% higher than that of the light emitting device of Comparative Example 1, and the surface of the sealing member is molded into a highly protruding convex surface. High light extraction efficiency is obtained.
- the light-emitting device of Example 2 has a side surface (side view) having a base of 2.0 mm in length, 3.0 mm in width, and 1.2 mm in thickness having an outer shape similar to that of the light-emitting device 400 in the example shown in FIG. ) Type surface mount type LED.
- the base is a conductive member, which is a pair of positive and negative lead frames made of copper alloy with silver plating on the surface, and a molded body made of polyphthalamide resin containing a white pigment of titanium oxide and a silica filler is integrally molded. Has been configured.
- Such a base is produced by installing a conductive member in a mold and injecting and solidifying the constituent material of the molded body. Note that a part of the surface of the conductive member constitutes a part of the bottom surface of the recess and extends to the outside of the molded body.
- a recess having a substantially rectangular shape in a top view with a length of 1.6 mm, a width of 2.2 mm, and a depth of 0.45 mm is formed by the molded body.
- protrusions that are linear in a top view and have a length of 1.6 mm, a width of 0.26 mm and a height of 0.21 mm.
- the cross-sectional shape of the protrusion is a substantially convex curved surface.
- one light emitting element is bonded to the negative electrode side conductive member with an adhesive, which is a translucent epoxy resin, and each electrode is connected to the positive and negative electrode conductive members by gold wires. ing.
- This light-emitting element has an n-type layer, an active layer, and a p-type layer of a nitride semiconductor stacked on a sapphire substrate in order to emit blue light (center wavelength of about 460 nm), length 200 ⁇ m, width 400 ⁇ m, thickness 85 ⁇ m. LED chip.
- the sealing member is provided so as to cover the light emitting element inside the concave portion of the base.
- This sealing member uses a phenyl silicone resin having a refractive index of 1.53 as a base material, and a YAG phosphor is dispersed therein.
- the surface of the sealing member has a substantially convex curved surface, and rises from the outward surface of the protrusion in the longitudinal direction of the base.
- the height of the surface of the sealing member (the height near the top) is 0.13 mm with the upper surface of the protrusion as the reference surface.
- Such a sealing member is molded by being dropped from the dispenser so that its surface rises from the outward surface of the protrusion in the longitudinal direction of the substrate in a fluid state, and solidified by heating in that state.
- Example 3 The light emitting device of Example 3 has the same configuration as the light emitting device of Example 2 except that the base material of the sealing member is a dimethyl silicone resin having a refractive index of 1.41.
- the light emitting device of Comparative Example 3 has the same configuration as the light emitting device of Comparative Example 2, except that the base material of the sealing member is a dimethyl silicone resin having a refractive index of 1.41.
- the light emitting devices of Examples 2 and 3 each have an initial light flux of 9.7% and 5.7% higher than that of Comparative Example 3, and are excellent in light extraction efficiency. I understand that.
- the initial luminous flux of the light emitting device of Comparative Example 2 is 1.1% lower than the initial luminous flux of the light emitting device of Comparative Example 3. From this, it can be seen that a light emitting device with particularly high light extraction efficiency can be obtained by combining the surface of the sealing member with a convex surface and the base material of the sealing member with phenyl silicone resin.
- the gas barrier property of the sealing member can be improved, discoloration of the conductive member due to the sulfur-containing gas can be suppressed, and a highly reliable light-emitting device can be obtained. Recognize.
- the light emitting device of Example 4 is an example of the light emitting device 600 shown in FIG. 8, and is a white light emitting COB (Chip On Board) type LED module.
- the wiring substrate 22 is an alumina substrate having a length of 16 mm, a width of 19 mm, and a thickness of 1.0 mm, and a wiring electrode having a gold plating on the outermost surface is provided on the upper surface thereof.
- the protrusion 34 is formed by drawing and solidifying a dimethyl silicone resin containing 30% of titanium oxide by weight with respect to the resin in an annular shape having an outer diameter of 10 mm, a width of 1.0 mm, and a height of 0.5 mm.
- the cross-sectional shape of the protrusion 34 is substantially semicircular.
- the light-emitting element 10 includes a nitride semiconductor n-type layer, an active layer, and a p-type layer sequentially stacked on a sapphire substrate, capable of emitting blue light (center wavelength of about 460 nm), 290 ⁇ m long, 500 ⁇ m wide, and having a thickness. It is an LED chip of 80 ⁇ m.
- the sealing member 40 includes two portions, a lower first sealing portion 401 and an upper second sealing portion 402.
- the first sealing portion 401 is made of a dimethyl silicone resin having a refractive index of 1.41 as a base material, and YAG phosphors are dispersed therein.
- the first sealing portion 401 covers all the light emitting elements 10 and is filled up to the vicinity of the top of the protrusion 34.
- the first sealing portion 401 has a peripheral edge that rises up to the protrusion 34 and a central portion that is recessed.
- the 2nd sealing part 402 uses the same dimethyl silicone resin as the 1st sealing part 401 as a base material, and 3% of colloidal silica is added in the weight ratio with respect to a base material in it.
- Most of the surface of the sealing member 40 (the surface of the second sealing portion 401) is a substantially convex curved surface rising from the outward surface 27 of the protrusion 34.
- the height of the surface of the sealing member 40 (height near the apex) is 3.0 mm with the upper surface of the wiring board as the reference surface.
- Such a second sealing portion 402 is formed by dripping from the dispenser so that most of the surface rises from the outward surface 27 of the projection 34 in a fluid state, and solidifying by heating in that state. Is done.
- the sealing member is composed only of the first sealing portion, and the surface thereof is formed on a substantially flat surface having substantially the same height as the top of the protrusions.
- the light emitting device has the same configuration.
- the light emitting device of Example 4 has a high initial luminous flux of 3.5% higher than that of the light emitting device of Comparative Example 4, and the surface of the sealing member is formed as a convex surface that protrudes high. The light extraction efficiency is obtained.
- FIG. 13A is a schematic cross-sectional view of the light emitting device according to the fifth embodiment.
- the light emitting device 900 in the example shown in FIG. 13A is a white light emitting LED.
- the wiring substrate 22 is an alumina substrate containing copper-tungsten as a heat sink material having a length of 3.5 mm, a length of 3.5 mm, and a thickness of 0.45 mm, and the upper surface of the wiring substrate 22 is plated with gold. An electrode is provided.
- the protrusions 34 are made by solidifying a dimethyl silicone resin containing 30% of titanium oxide by weight with respect to the resin, drawn with a dispenser in an annular shape having an outer diameter of 2.6 mm, a width of 0.4 mm, and a height of 0.15 mm. is there.
- the cross-sectional shape of the protrusion 34 is substantially semicircular.
- One light emitting element 10 is flip-chip mounted with gold-tin eutectic solder on the upper surface of the wiring board 22 inside the protrusion 34 and connected to the wiring electrode of the wiring board 22.
- the light-emitting element 10 includes a nitride semiconductor n-type layer, an active layer, and a p-type layer sequentially stacked on a sapphire substrate.
- the light-emitting element 10 emits blue light (center wavelength: about 460 nm) and has a length of 1.0 mm and a width of 1. This is an LED chip having a thickness of 0 mm and a thickness of 110 ⁇ m.
- the light emitting element 10 is covered with a wavelength conversion member 55.
- the wavelength converting member 55 is obtained by attaching a YAG phosphor to the light emitting element 10 by electrophoretic electrodeposition and impregnating it with a phenyl silicone resin having a refractive index of 1.51.
- the sealing member 40 is made of dimethyl silicone resin having a refractive index of 1.41 as a base material, and colloidal silica is added to the base material by 2.5% by weight with respect to the base material.
- Most of the surface of the sealing member 40 is a substantially convex curved surface rising from the outward surface 27 of the protrusion 34.
- the height of the surface of the sealing member 40 (height near the apex) is 3.0 mm with the upper surface of the wiring board as the reference surface.
- Such a sealing member 40 is formed by dripping from a dispenser so that most of the surface rises from the outward surface 27 of the protrusion 34 in a fluid state, and solidifying by heating in that state. .
- Example 6 The light emitting device of Example 6 has the same configuration as the light emitting device of Example 5 except that the protrusion 34 does not contain titanium oxide and is substantially transparent.
- FIG. 13B is a schematic cross-sectional view of a light emitting device according to Comparative Example 5.
- the light emitting device 950 of the example shown in FIG. 13B is different from the light emitting device 900 of Example 5 in the formation method of the sealing member 48.
- the light emitting element 10, the wiring board 22, and the wavelength conversion member 55 of the light emitting device 950 are the same as those of the light emitting device 900 of Example 5, and the constituent materials of the sealing member 48 are the same as those of the light emitting device of Example 5. It is.
- the sealing member 48 is directly formed on the wiring board 22 by a compression molding method. There are no protrusions.
- the sealing member 48 has a convex surface with an outer diameter of ⁇ 2.6 mm at the center and a height (height near the apex) of 1.55 mm with the upper surface of the wiring board as a reference surface.
- each light emitting device is caused to emit light at a forward current of 350 [mA], and its luminous flux is measured.
- the initial luminous flux of the light emitting device of Comparative Example 5 is 121.6 [lm]
- the initial luminous flux of the light emitting device of Example 4 is 127.1 [lm]
- the initial luminous flux of the light emitting device of Example 5 is It is 124.4 [lm].
- each of the light emitting devices of Examples 5 and 6 has an initial light flux that is 4.5% and 2.3% higher than that of the light emitting device of Comparative Example 5, and is excellent in light extraction efficiency. I understand that.
- the sealing member 48 formed on the wiring board using a mold such as a compression molding method has a surface with a convex central portion and the periphery thereof continuously. It has a hook-like portion that is a runner of the sealing member 48 provided so as to extend on the wiring board 22. For this reason, a part of the light emitted from the light emitting element 10 is guided to the bowl-shaped portion, the light loss due to the absorption of the wiring board 22 is increased, and the light extraction efficiency is lowered.
- the sealing member 40 formed by the dropping method does not have such a hook-shaped portion, and can efficiently extract light emitted from the light emitting element 10. .
- the light emitting device includes a backlight source of a liquid crystal display, various lighting devices, a large display, various display devices such as advertisements and destination guidance, and an image reading device in a digital video camera, a facsimile, a copier, a scanner, and the like. It can be used for projector devices.
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Abstract
Description
発光素子が接続される導電部材と、該導電部材と一体成形された成形体と、を有する基体上に、前記発光素子を封止する封止部材を滴下により成形する工程において、
前記封止部材は、該封止部材の縁の少なくとも一部が前記導電部材又は前記成形体の上面視外側に向いた外向面に設けられる、ように成形されることを特徴とする。
発光素子と、
前記発光素子が接続される導電部材と、該導電部材と一体成形された成形体と、を有する基体と、
前記発光素子を封止する封止部材と、を備え、
前記封止部材の縁の少なくとも一部は、前記導電部材又は前記成形体の上面視外側に向いた外向面に設けられ、且つ、前記外向面に対して又は該外向面と該封止部材の縁の接点において該外向面に接する接平面に対して、略接触角又は接触角未満の角度をなして設けられていることを特徴とする。
発光素子が載置される配線基板の上面の前記発光素子の外側に突起を設ける第1の工程と、
前記発光素子を封止する封止部材を滴下により形成する第2の工程と、を具備し、
前記封止部材は、該封止部材の縁の少なくとも一部が前記突起の上面視外側に向いた外向面に設けられる、ように形成されることを特徴とする。
発光素子と、
前記発光素子が載置される上面の該発光素子の外側に突起が設けられた配線基板と、
前記発光素子を封止する封止部材と、を備え、
前記封止部材の縁の少なくとも一部は、前記突起の上面視外側に向いた外向面に設けられ、且つ、前記外向面に対して又は該外向面と該封止部材の縁の接点において該外向面に接する接平面に対して、略接触角又は接触角未満の角度をなして設けられていることを特徴とする。
「外向」、「外側」とは、発光装置を上面方向から視たときに、発光素子から離れる方向のことである。また、「内向」、「内側」とは、発光装置を上面方向から視たときに、発光素子に向かう方向のことである。
成形体、導電部材および突起の「外向面」とは、成形体、導電部材および突起(成形体等と称する)の表面において、当該表面の法線ベクトルが、外向きの成分を含んでいることを意味する。なお、外向面が曲面の場合、「外向面」とは、封止部材の縁との接点における成形体、導電部材および突起の表面の接平面において、法線ベクトルが外向きの成分を含んでいることを意味する。
「略接触角又は接触角未満」とは、実質的に接触角と等しいか、又は接触角より小さい角度のことを意味している。
図1(a)は、実施の形態1に係る発光装置の概略上面図であり、図1(b)は、図1(a)におけるA-A断面を示す概略断面図である。図1に示す例の発光装置100は、発光素子10と、発光素子10が接続される導電部材20及び導電部材20と一体成形された成形体25を有する基体30と、発光素子10を封止する封止部材40と、を備えている。
後述するように、(外向面38と封止部材40の縁との接点における)封止部材40の表面45の接線と、外向面38とのなす角度は、略接触角になる。「接触角」は、固化前の流動性を有する状態の封止部材40および外向面38の物性によって決定される。
液滴Lの表面張力をγL、固体Sの表面張力をγS、液滴Lと固体Sとの間の界面張力γSLとすると、以下の式が成り立つ(Youngの式)
図4(a)は、実施の形態2に係る発光装置の概略上面図であり、図4(b)は、図4(a)におけるB-B断面を示す概略断面図である。図4に示す例の発光装置200は、発光素子10と、発光素子10が接続される導電部材20及び導電部材20と一体成形された成形体25を有する基体30と、発光素子10を封止する封止部材40と、を備えている。
図5(a)は、実施の形態3に係る発光装置の概略上面図であり、図5(b)は、図5(a)におけるC-C断面を示す概略断面図である。図5に示す例の発光装置300は、発光素子10と、発光素子10が接続される導電部材20及び導電部材20と一体成形された成形体25を有する基体30と、発光素子10を封止する封止部材40と、を備えている。
図6(a)は、実施の形態4に係る発光装置の概略上面図であり、図6(b),(c)は各々、図6(a)におけるD-D断面,E-E断面を示す概略断面図である。図6に示す例の発光装置400は、発光素子10と、発光素子10が接続される導電部材20及び導電部材20と一体成形された成形体25を有する基体30と、発光素子10を封止する封止部材40と、を備えている。
図7(a)は、実施の形態5に係る発光装置の概略上面図であり、図7(b)は、図7(a)におけるF-F断面を示す概略断面図である。図7に示す例の発光装置500は、凹部31及び突起33の形状を除いて、上述の実施の形態4の発光装置と略同じ構成である。上述の実施の形態4の発光装置において、凹部31の上面視形状は矩形状であり、凹部31の開口面積を広くしやすい点で優れている。一方、図7に示す例の発光装置500において、凹部31の上面視形状は、矩形の両側(左右)に半円を組み合わせたような形状(小判形)となっている。そして、突起33は、基体30の凹部31外周部において、半円部の輪郭に沿って湾曲した帯状に形成されている。このように、突起又は溝は、帯状に設けられる場合においても、基体30の上面視において、その角部又は全体が湾曲していることが好ましい。これにより、封止部材40の表面に生じる歪みを緩和し、封止部材40の表面を比較的滑らかな凸面に成形することができ、光の取り出し効率を高めやすい。
図8(a)は、実施の形態6に係る発光装置の概略上面図であり、図8(b)は、図8(a)におけるG-G断面を示す概略断面図である。図8に示す例の発光装置600は、発光素子10と、発光素子10が載置される配線基板22及び配線基板22の上面に設けられた突起34を有する基体30と、発光素子10を封止する封止部材40と、を備えている。
上述したように、(外向面27と封止部材40の縁との接点における)封止部材40の表面45の接線と、外向面27とのなす角度は、略接触角になる。
図10(a)は、実施の形態7に係る発光装置の概略上面図であり、図10(b)は、図10(a)におけるH-H断面を示す概略断面図である。図10に示す例の発光装置700は、発光素子10と、発光素子10が載置される配線基板22及び配線基板22の上面に設けられた突起34を有する基体30と、発光素子10を封止する封止部材40と、を備えている。
図11(a)は、実施の形態8に係る発光装置の概略上面図であり、図11(b)は、図11(a)におけるJ-J断面を示す概略断面図である。図11に示す例の発光装置800は、発光素子10と、発光素子10が載置される配線基板22及び配線基板22の上面に設けられた突起34を有する基体30と、発光素子10を封止する封止部材40と、を備えている。より詳細には、基体30は、上面に配線電極を備える配線基板22と、その上面の発光素子10の左右に縦方向(図中y方向)に延伸する直線状に設けられた白色の樹脂の成形体である突起34と、を有している。発光素子10は、1個のLEDチップであり、配線基板22の上面の突起34の内側において、配線電極に導電性の接着剤で接着されている。また、発光素子10の下位、つまり発光素子10と配線基板22の間には、被覆部材(第1の被覆部材)70が設けられている。この被覆部材70は、白色の樹脂である。これにより、発光素子10から下方に出射される光を反射させ、上方に効率良く取り出すことができる。
まず、図12(a)に示すように、配線基板22に発光素子10を実装する。具体的には、発光素子10を、配線基板の配線電極に導電性の接着剤で接着する。このとき、発光素子10は1個でもよいが、複数個の発光素子10が一方向(図中y方向)に配列されることが好ましい。列の数は、1つでも複数でもよい。また、ここでは、配線基板22は、複数の発光装置を形成可能な複合基板を用いる。
次に、図12(b),(c)に示すように、基体30上に封止部材40を滴下により形成する。具体的には、流動性を有する状態の封止部材40を、ディスペンサ等を用いて発光素子10を被覆するように基体30上に滴下し、封止部材40を加熱又は冷却等により固化させる。このとき、封止部材40は、封止起立面37の少なくとも一部を突起34の外向面27とするように形成される。言い換えれば、封止部材40は、その表面45の少なくとも一部が、突起34の外向面27から立ち上がるように形成される。また、封止部材40は、その表面形状の対称性を高めるため、両側の突起34に跨って設けられることが好ましい。さらに、図示するように、基体30を逆さにして、つまり封止部材40が滴下された配線基板22の上面が鉛直方向下側に向いた状態で、封止部材40を固化させてもよい。これにより、重力を利用して、封止部材40の表面を高く突出させることができる。特に、封止部材40の表面を鉛直方向に長く延出させて形成することができ、指向性の良好な、光度を高い発光装置を得ることができる。さらには、実施の形態7の第2の突起342のように、外向面が配線基板の上面に面するように傾斜している突起では、比較的多量の封止部材を保持しやすく、封止部材の表面をより高く突出させるために、本姿勢での固化が特に好適である。なお、勿論、通常の姿勢、つまり配線基板22の上面が鉛直方向上側に向いた状態で、封止部材40を固化させてもよい。
最後に、図12(d)に示すように、発光素子と発光素子との間の配線基板22及び封止部材40を切断して、発光装置800を個片化する。このとき、発光素子10の配列方向に略直交する方向に配線基板22及び封止部材40を切断することが好ましい。以上のような方法により、図11に示す例の発光装置800を生産性良く製造することができる。
発光素子は、LED素子やLD素子などの半導体発光素子を用いることができる。発光素子は、種々の半導体で構成される素子構造に正負一対の電極が設けられているものであればよい。特に、蛍光体を効率良く励起可能な窒化物半導体(InxAlyGa1-x-yN、0≦x、0≦y、x+y≦1)の発光素子が好ましい。このほか、緑色~赤色発光のガリウム砒素系、ガリウム燐系半導体の発光素子でもよい。正負一対の電極が同一面側に設けられている発光素子の場合、その実装形態は、各電極がワイヤで導電部材又は配線基板の配線電極と接続されるフェイスアップ実装でもよいし、各電極が導電性の接着剤で導電部材又は配線基板の配線電極と接続されるフェイスダウン(フリップチップ)実装でもよい。このほか、正負一対の電極が互いに反対の面に各々設けられている対向電極構造の発光素子でもよい。発光素子の実装面側に、銀やアルミニウムなどの金属層や誘電体反射膜が設けられることで、光の取り出し効率を高めることができる。1つの発光装置に実装される発光素子の個数は1つでも複数でもよく、その大きさや形状、発光波長も任意に選べばよい。例えば、1つの発光装置に、赤色、緑色、青色発光の発光素子が実装されてもよい。複数の発光素子は、不規則に配置されてもよいが、行列や同心円状など規則的又は周期的に配置されることで、好ましい配光が得られやすい。また、複数の発光素子は、導電部材、配線基板の配線電極、およびワイヤ等により直列又は並列に接続できる。
基体は、発光素子が載置される台座となる部材である。実施の形態1~5では、基体は、主として、導電部材と、これと一体成形された成形体と、により構成される。実施の形態6~8では、基体は、主として、配線基板と、その上面に設けられる突起と、により構成される。基体は、導電部材の一部を底面に含む凹部を備えた形態のほか、凹部(側壁)を備えない板状の形態でもよい。
導電部材は、発光素子に接続されて導電可能な金属部材を用いることができる。具体的には、銅、アルミニウム、金、銀、タングステン、鉄、ニッケル、コバルト、モリブデン、又はこれらの合金、燐青銅、鉄入り銅などで形成されたリードフレームや配線電極が挙げられる。また、その表層に、銀、アルミニウム、ロジウム、金、銅、又はこれらの合金などの鍍金や光反射膜が設けられていてもよく、なかでも光反射性に最も優れる銀が好ましい。
成形体の母材は、脂肪族ポリアミド樹脂、半芳香族ポリアミド樹脂、ポリエチレンテレフタレート、ポリシクロヘキサンテレフタレート、液晶ポリマー、ポリカーボネート樹脂、シンジオタクチックポリスチレン、ポリフェニレンエーテル、ポリフェニレンスルフィド、ポリエーテルスルホン樹脂、ポリエーテルケトン樹脂、ポリアリレート樹脂などの熱可塑性樹脂、ポリビスマレイミドトリアジン樹脂、エポキシ樹脂、シリコーン樹脂、シリコーン変性樹脂、シリコーン変成樹脂、ポリイミド樹脂、ポリウレタン樹脂、などの熱硬化性樹脂が挙げられる。また、これらの母材中に、充填剤又は着色顔料として、ガラス、シリカ、酸化チタン、酸化マグネシウム、炭酸マグネシウム、水酸化マグネシウム、炭酸カルシウム、水酸化カルシウム、珪酸カルシウム、珪酸マグネシウム、ワラストナイト、マイカ、酸化亜鉛、チタン酸バリウム、チタン酸カリウム、ホウ酸アルミニウム、酸化アルミニウム、酸化亜鉛、炭化ケイ素、酸化アンチモン、スズ酸亜鉛、ホウ酸亜鉛、酸化鉄、酸化クロム、酸化マンガン、カーボンブラックなどの粒子又は繊維を混入させることができる。このほか、成形体は、ガラス、セラミックスなどで形成することもできる。
配線基板は、ガラスエポキシ、ガラス、セラミックス、各種樹脂、アルミニウム等の各種基板に、発光素子及び外部接続用の端子部(パッド部)と接続される配線電極や回路部品が設けられたものを利用できる。特に、セラミックスとしては、アルミナ、窒化アルミニウム、ムライト、炭化珪素、窒化珪素などが好ましい。樹脂としては、エポキシ樹脂、ポリイミド樹脂、フェノール樹脂、BTレジン、ポリフタルアミド樹脂(PPA)、ポリエチレンテレフタレート樹脂(PET)、ポリブチレンテレフタレート樹脂(PBT)などが好ましい。配線電極は、発光素子に接続されて導電可能な金属部材を用いることができる。具体的には、配線電極は、銅、アルミニウム、金、銀、タングステン、鉄、ニッケル、コバルト、モリブデン、又はこれらの合金、燐青銅、鉄入り銅などで形成される。配線電極は、基板の上面、下面(裏面)、側面に露出されてもよいし、基板内部に設けられてもよい。特に、基板上面に露出される配線電極は、その表層に、銀、アルミニウム、ロジウム、金、銅、又はこれらの合金などの鍍金や光反射膜が設けられていてもよく、なかでも例えば光反射性に優れる銀を採用できる。配線基板は、突起が設けられる位置に、凹部又は孔を備えてもよく、その凹部又は孔に突起の一部が充填又は係止されるようにすることで、配線基板と突起の密着性を高めることができる。このとき、凹部又は孔は、上面視において、例えば点状又は線状に設けられる。また、凹部又は孔の開口径は、突起の幅より小さいことが好ましい。
突起は、主として、封止部材の表面を立ち上がらせる外向面を提供する部材として、配線基板の上面に設けられる。突起は通常、発光素子の外側に設けられるが、発光素子の下部に設けられてもよい(言い換えれば、発光素子が突起上に設けられてもよい)。また、突起は、その内壁面で発光素子から側方へ出射された光を上方へ反射させる光反射体としても機能する。したがって、光反射性に優れる白色系の部材であることが好ましく、さらに配線基板の配線電極と電気的に絶縁されるものが好ましい。このほか、突起は、略透明など、透光性に優れる部材であることで、発光装置の配光を広げることもできる。樹脂としては、熱硬化性樹脂、熱可塑性樹脂などを用いることができる。具体的には、シリコーン樹脂、エポキシ樹脂、フェノール樹脂、BTレジン、PPA、PET、PBT、フッ素樹脂、ポリオレフィン樹脂、ポリノルボルネン樹脂などが挙げられる。そして、これらの母材となる樹脂に、例えば、酸化チタン、酸化アルミニウム、酸化ジルコニウム、酸化マグネシウムなどの粒子が添加されることで、効率良く光を反射させることができる。このような突起は、例えば、ディスペンサなどにより配線基板上に吐出された後、固化されて設けられる。このほか、突起は、任意の形状に形成された部材を配線基板に固定することで設けることもできる。その場合、材料としては、上述の樹脂に加え、セラミックスを用いることができる。金属でもよい。なお、封止部材の表面を高く突出した凸面に形成しやすくするために、突起の少なくとも表面は、臨界表面張力が50mN/m以下の材料により構成されていることが好ましい。上記材料中では、シリコーン樹脂、フッ素樹脂、ポリオレフィン樹脂、ポリノルボルネン樹脂が特に好ましく、なかでも、耐熱性や耐光性に優れ、接着性の比較的良好なシリコーン樹脂が好ましい。また、突起は、単一の層で構成されてもよいが、複数の層で構成されてもよい。
封止部材は、発光素子、ワイヤおよび導電部材の一部を封止して、それらを埃や水分、外力などから保護する部材である。封止部材の母材は、電気的絶縁性を有し、発光素子から出射される光を透過可能(好ましくは透過率70%以上)であり、固化前は流動性を有する材料であればよい。具体的には、シリコーン樹脂、シリコーン変性樹脂、シリコーン変成樹脂、エポキシ樹脂、フェノール樹脂、ポリカーボネート樹脂、アクリル樹脂、TPX樹脂、ポリノルボルネン樹脂、又はこれらの樹脂を1種以上含むハイブリッド樹脂が挙げられる。ガラスでもよい。なかでも、シリコーン樹脂は、耐熱性や耐光性に優れ、固化後の体積収縮が少ないため、好ましい。特に、封止部材の母材は、フェニルシリコーン樹脂を主成分とすることが好ましい。下記実施例において示すように、封止部材の表面を凸面とする場合には、ジメチルシリコーン樹脂よりフェニルシリコーン樹脂が光の取り出し効率に優れている。また、フェニルシリコーン樹脂は、ガスバリア性にも優れ、腐食性ガスによる導電部材の劣化を抑制しやすい。
蛍光体は、発光素子から出射される一次光の少なくとも一部を吸収して、一次光とは異なる波長の二次光を出射する。具体的には、セリウムで賦活されたイットリウム・アルミニウム・ガーネット(YAG)、ユウロピウム及び/又はクロムで賦活された窒素含有アルミノ珪酸カルシウム(CaO-Al2O3-SiO2)、ユウロピウムで賦活されたシリケート((Sr,Ba)2SiO4)などが挙げられる。これにより、可視波長の一次光及び二次光の混色光(例えば白色系)を出射する発光装置や、紫外光の一次光に励起されて可視波長の二次光を出射する発光装置とすることができる。
波長変換部材は、上記のような蛍光体を含む透光性部材を用いることができる。具体的には、蛍光体が配合された上記封止部材と同様の樹脂やガラスの成形体、蛍光体と無機結合剤との焼結体、蛍光体の結晶などが挙げられる。波長変換部材は、板状やフィルム状などに予め形成されたものを発光素子に透光性の接着剤で接着若しくは直接接合する、又は流動性を有する状態のものを発光素子に塗布する、又は蛍光体を発光素子に電気泳動電着した後それに樹脂を含浸させる、などして設けられる。
被覆部材は、配線基板の上面、発光素子の下面や側面などを被覆する部材である。特に、被覆部材は、発光素子から出射される光を効率良く反射できる、電気的絶縁性を有する白色系の部材であることが好ましい。具体的な材料としては、上記突起と同様の樹脂、又は上記突起と同様の粒子が添加された樹脂を用いることができる。
ワイヤは、発光素子の電極と、導電部材又は配線基板の配線電極とを電気的に接続する部材である。ワイヤは、金、銅、銀、白金、アルミニウム又はこれらの合金の金属線を用いることができる。特に、封止部材からの応力による破断が生じにくく、熱抵抗などに優れる金線が好ましい。
接着剤は、発光素子を基体又は配線基板に固定する部材である。絶縁性の接着剤は、エポキシ樹脂、シリコーン樹脂、ポリイミド樹脂、又はこれらの変性樹脂やハイブリッド樹脂などを用いることができる。導電性の接着剤としては、銀、金、パラジウムなどの導電性ペーストや、金-錫などの半田、低融点金属などのろう材を用いることができる。
実施例1の発光装置は、図1に示す例の発光装置100に似た外形を有する、縦5.0mm、横6.5mm、厚さ1.35mmの基体を備えた、表面発光(トップビュー)式の表面実装型LEDである。基体は、表面に銀の鍍金が施された銅合金製の正負一対のリードフレームである導電部材に、酸化チタンの白色顔料とシリカの充填剤を含むエポキシ樹脂製の成形体が一体成形されて、構成されている。このような基体は、金型内に、導電部材を設置して、成形体の構成材料を注入し固化させることで作製される。なお、導電部材は、その表面の一部が凹部底面の一部を構成し、且つ成形体の外側に延出している。
比較例1の発光装置は、封止部材の表面が、突起の内向面に接続され、突起の上面と略同一面の平坦面に成形されていることを除けば、実施例1の発光装置と同じ構成である。
実施例1及び比較例1の発光装置における光の取り出し効率を光束の測定により検証する。具体的には、各発光装置を順電流350mA(並列)で各々発光させ、その光束を測定する。比較例1の発光装置の光束は119.8[lm]であり、実施例1の発光装置の光束は129.4[lm]である。なお、この光束は、比較のため、色度(x,y)=(0.345,0.357)における値に換算している。このように、実施例1の発光装置は、その光束が比較例1の発光装置に比べ8.1%も高くなっており、封止部材の表面が高く突出した凸面に成形されていることで、高い光の取り出し効率が得られている。
実施例2の発光装置は、図6に示す例の発光装置400に似た外形を有する、縦2.0mm、横3.0mm、厚さ1.2mmの基体を備えた、側面発光(サイドビュー)式の表面実装型LEDである。基体は、表面に銀の鍍金が施された銅合金製の正負一対のリードフレームである導電部材に、酸化チタンの白色顔料とシリカの充填剤を含むポリフタルアミド樹脂製の成形体が一体成形されて、構成されている。このような基体は、金型内に、導電部材を設置して、成形体の構成材料を注入し固化させることで作製される。なお、導電部材は、その表面の一部が凹部底面の一部を構成し、且つ成形体の外側に延出している。
実施例3の発光装置は、封止部材の母材が屈折率1.41のジメチルシリコーン樹脂であることを除くと、実施例2の発光装置と同じ構成である。
比較例2の発光装置は、基体に突起が設けられておらず、封止部材の表面が、凹部の内向面に接続され、凹部の上面と略同一面の平坦面に成形されていることを除けば、実施例2の発光装置と同じ構成である。
比較例3の発光装置は、封止部材の母材が屈折率1.41のジメチルシリコーン樹脂であることを除けば、比較例2の発光装置と同じ構成である。
実施例2,3及び比較例2,3の発光装置における光の取り出し効率を初期光束の測定により検証する。具体的には、各発光装置を順電流20[mA]で各々発光させ、その光束を測定する。なお、以下に示す初期光束は、比較のため、色度(x,y)=(0.300,0.286)における値に換算している。
また、実施例2,3及び比較例2,3の発光装置における信頼性を硫化試験により検証する。具体的には、密閉容器中に、発光装置と1gの硫化ナトリウムを入れ、80℃に加熱して24時間放置し、試験前後における光束の維持率を測定する。
実施例4の発光装置は、図8に示す発光装置600の一例であり、白色系発光のCOB(Chip On Board)タイプのLEDモジュールである。配線基板22は、縦16mm、横19mm、厚さ1.0mmのアルミナ基板であり、その上面には最表面に金の鍍金が施された配線電極が設けられている。突起34は、酸化チタンを樹脂に対する重量比で30%含むジメチルシリコーン樹脂が、外径10mm、幅1.0mm、高さ0.5mmの円環状にディスペンサで描画され、固化されたものである。この突起34の断面視形状は、略半円状である。
比較例4の発光装置は、封止部材が第1封止部のみからなり、その表面が突起の頂上と略同じ高さのほぼ平坦な面に形成されていることを除けば、実施例4の発光装置と同じ構成である。
実施例4及び比較例4の発光装置における光の取り出し効率を初期光束の測定により検証する。具体的には、各発光装置を順電流320[mA]で各々発光させ、その光束を測定する。比較例4の発光装置の初期光束は1113[lm]であるのに対して、実施例4の発光装置の初期光束は1152[lm]である。なお、この光束は、比較のため、色度x値=0.32における値に換算したものである。このように、実施例4の発光装置は、その初期光束が比較例4の発光装置に比べて3.5%高く、封止部材の表面が高く突出した凸面に形成されていることで、高い光の取り出し効率が得られている。
図13(a)は、実施例5に係る発光装置の概略断面図である。図13(a)に示す例の発光装置900は、白色系発光のLEDである。配線基板22は、縦3.5mm、縦3.5mm、厚さ0.45mmのヒートシンク材料として銅-タングステンを内蔵するアルミナ基板であり、その上面には最表面に金の鍍金が施された配線電極が設けられている。突起34は、酸化チタンを樹脂に対する重量比で30%含むジメチルシリコーン樹脂が、外径2.6mm、幅0.4mm、高さ0.15mmの円環状にディスペンサで描画され、固化されたものである。この突起34の断面視形状は、略半円状である。
実施例6の発光装置は、突起34が酸化チタンを含まず略透明なものであることを除けば、実施例5の発光装置と同じ構成である。
図13(b)は、比較例5に係る発光装置の概略断面図である。図13(b)に示す例の発光装置950は、封止部材48の形成方法が実施例5の発光装置900と異なる。なお、発光装置950の発光素子10、配線基板22、及び波長変換部材55は、実施例5の発光装置900と同じものであり、封止部材48の構成材料は実施例5の発光装置と同じである。この封止部材48は、圧縮成形法により配線基板22に直接形成されたものである。突起は設けられていない。封止部材48は、表面が凸面の中央部の外径がΦ2.6mmであり、その高さ(頂点近傍の高さ)が配線基板の上面を基準面として1.55mmである。
実施例5,6及び比較例5の発光装置における光の取り出し効率を初期光束の測定により検証する。具体的には、各発光装置を順電流350[mA]で各々発光させ、その光束を測定する。比較例5の発光装置の初期光束は121.6[lm]であるのに対して、実施例4の発光装置の初期光束は127.1[lm]、実施例5の発光装置の初期光束は124.4[lm]である。なお、この光束は、比較のため、色度x値=0.355における値に換算したものである。このように、実施例5,6の発光装置は各々、その初期光束が比較例5の発光装置に比べて4.5%、2.3%高くなっており、光の取り出し効率に優れていることがわかる。
Claims (52)
- 発光素子が接続される導電部材と、該導電部材と一体成形された成形体と、を有する基体上に、前記発光素子を封止する封止部材を滴下により成形する工程において、
前記封止部材は、該封止部材の縁の少なくとも一部が前記導電部材又は前記成形体の上面視外側に向いた外向面に設けられる、ように成形される発光装置の製造方法。 - 前記外向面は、凸曲面、又は該凸曲面に連続する下側の面、である請求項1に記載の発光装置の製造方法。
- 前記外向面は、該外向面に連続する上側の平面からの傾斜角度が45度以下の平面である請求項1に記載の発光装置の製造方法。
- 前記基体の構成面のうち、前記封止部材の縁より内側にある、該基体の上面視内側に向いた内向面の少なくとも一部は、その最上位に凸曲面を有する請求項1乃至3のいずれか一項に記載の発光装置の製造方法。
- 前記基体は、突起又は溝を備え、
前記封止部材の縁の少なくとも一部は、前記突起又は溝の外向面に設けられる請求項1乃至4のいずれか一項に記載の発光装置の製造方法。 - 前記基体は、第1の突起又は第1の溝と、それより外側にある第2の突起又は第2の溝と、を備え、
前記封止部材の縁の少なくとも一部は、前記第1及び第2の突起、前記第1及び第2の溝のうちのいずれかの外向面に設けられる請求項5に記載の発光装置の製造方法。 - 前記封止部材は、前記発光素子を封止する第1封止部と、該第1封止部を封止する第2封止部と、を備え、
前記第1封止部は、該第1封止部の縁の少なくとも一部が前記第1の突起又は第1の溝の外向面に設けられる、ように成形され、
前記第2封止部は、該第2封止部の縁の少なくとも一部が前記第2の突起又は第2の溝の外向面に設けられる、ように成形される請求項6に記載の発光装置の製造方法。 - 前記封止部材は、前記第1封止部内に限って、前記発光素子から出射される光に励起される蛍光体を含有している請求項7に記載の発光装置の製造方法。
- 前記突起又は溝は、該基体の上面視において、その角部又は全体が湾曲している請求項5乃至8のいずれか一項に記載の発光装置の製造方法。
- 前記突起又は溝は、前記発光素子を囲む枠状に設けられている請求項5乃至9のいずれか一項に記載の発光装置の製造方法。
- 前記基体は、前記発光素子がその内側に載置される凹部を備え、
前記封止部材の縁は、前記凹部内に設けられる請求項1乃至10のいずれか一項に記載の発光装置の製造方法。 - 前記封止部材を前記基体上に滴下する前に、前記基体の前記封止部材の縁が設けられる外向面に限って、又は該外向面及び該外向面より外側の構成面に、臨界表面張力が50mN/m以下の被膜を形成する請求項1乃至11のいずれか一項に記載の発光装置の製造方法。
- 前記封止部材の母材は、フェニルシリコーン樹脂を主成分とする請求項1乃至12のいずれか一項に記載の発光装置の製造方法。
- 発光素子と、
前記発光素子が接続される導電部材と、該導電部材と一体成形された成形体と、を有する基体と、
前記発光素子を封止する封止部材と、を備え、
前記封止部材の縁の少なくとも一部は、前記導電部材又は前記成形体の上面視外側に向いた外向面に設けられ、且つ、前記外向面に対して又は該外向面と該封止部材の縁の接点において該外向面に接する接平面に対して、略接触角又は接触角未満の角度をなして設けられている発光装置。 - 前記封止部材の縁の少なくとも一部は、前記発光装置の上面視における水平面に対して、前記接触角より大きい角度をなして設けられていることを特徴とする請求項14に記載の発光装置。
- 前記外向面は、凸曲面、又は該凸曲面に連続する下側の面、である請求項14に記載の発光装置。
- 前記外向面は、該外向面に連続する上側の平面からの傾斜角度が45度以下の平面である請求項14に記載の発光装置。
- 前記基体は、突起又は溝を備え、
前記封止部材の縁の少なくとも一部は、前記突起又は溝の外向面に設けられている請求項14乃至17のいずれか一項に記載の発光装置。 - 前記封止部材は、前記発光素子を封止する第1封止部と、該第1封止部を封止する第2封止部と、を備え、且つ、前記第1封止部内に限って、前記発光素子から出射される光に励起される蛍光体を含有しており、
前記第2封止部の縁の少なくとも一部は、前記突起又は溝の外向面に設けられている請求項18に記載の発光装置。 - 前記基体は、前記発光素子がその内側に載置される凹部を備え、
前記突起又は溝は、前記凹部内に設けられている請求項18又は19に記載の発光装置。 - 前記基体は、前記発光素子がその内側に載置される凹部を備え、
前記突起又は溝は、前記凹部の外側に設けられている請求項18又は19に記載の発光装置。 - 前記突起又は溝は、前記発光素子を囲む枠状に設けられている請求項18乃至21のいずれか一項に記載の発光装置。
- 前記突起又は溝は、前記凹部の左右に帯状に設けられている請求項21に記載の発光装置。
- 前記突起又は溝は、該基体の上面視において、その角部又は全体が湾曲している請求項18乃至23のいずれか一項に記載の発光装置。
- 前記基体は、第1の突起又は第1の溝と、それより外側にある第2の突起又は第2の溝と、を備え、
前記封止部材は、前記発光素子を封止する第1封止部と、該第1封止部を封止する第2封止部と、を備え、且つ、前記第1封止部内に限って、前記発光素子から出射される光に励起される蛍光体を含有しており、
前記第1封止部は、該第1封止部の縁の少なくとも一部が前記第1の突起又は第1の溝の外向面に設けられ、
前記第2封止部は、該第2封止部の縁の少なくとも一部が前記第2の突起又は第2の溝の外向面に設けられている請求項14乃至17のいずれか一項に記載の発光装置。 - 前記基体は、前記封止部材の縁が設けられる前記外向面より外側に、該基体の上面視内側に向いた内向面を有する請求項14乃至25のいずれか一項に記載の発光装置。
- 前記封止部材の母材は、フェニルシリコーン樹脂を主成分とする請求項14乃至26のいずれか一項に記載の発光装置。
- 発光素子と、
前記発光素子が接続される導電部材と、該導電部材と一体成形された成形体と、を有する基体と、
前記発光素子を封止する封止部材と、を備え、
前記封止部材の縁の少なくとも一部は、前記導電部材又は前記成形体の上面視外側に向いた外向面に設けられ、
前記基体は、前記封止部材の縁が設けられる前記外向面より外側に、該基体の上面視内側に向いた内向面を有する発光装置。 - 発光素子が載置される配線基板の上面の前記発光素子の外側に突起を設ける第1の工程と、
前記発光素子を封止する封止部材を滴下により形成する第2の工程と、を具備し、
前記封止部材は、該封止部材の縁の少なくとも一部が前記突起の上面視外側に向いた外向面に設けられる、ように形成される発光装置の製造方法。 - 前記外向面は、凸曲面、又は該凸曲面に連続する下側の面、である請求項29に記載の発光装置の製造方法。
- 前記外向面は、該外向面に連続する上側の平面からの傾斜角度が45度以下の平面である請求項29に記載の発光装置の製造方法。
- 前記外向面は、前記配線基板の上面に面するように傾斜している請求項29乃至31のいずれか一項に記載の発光装置の製造方法。
- 前記封止部材の縁より内側にある、前記突起の上面視内側に向いた内向面の少なくとも一部は、その最上位に凸曲面を有する請求項29乃至32のいずれか一項に記載の発光装置の製造方法。
- 前記第1の工程において、前記配線基板の上面に、第1の突起と、それより外側にある第2の突起と、を設け、
前記第2の工程において、前記封止部材の縁の少なくとも一部は、前記第1の突起及び前記第2の突起のうちのいずれかの外向面に設けられる請求項29乃至33のいずれか一項に記載の発光装置の製造方法。 - 前記封止部材は、前記発光素子を封止する第1封止部と、該第1封止部を封止する第2封止部と、を備え、
前記第1封止部は、該第1封止部の縁の少なくとも一部が前記第1の突起の外向面に設けられる、ように形成され、
前記第2封止部は、該第2封止部の縁の少なくとも一部が前記第2の突起の外向面に設けられる、ように形成される請求項34に記載の発光装置の製造方法。 - 前記封止部材は、前記第1封止部内に限って、前記発光素子から出射される光に励起される蛍光体を含有している請求項35に記載の発光装置の製造方法。
- 前記突起は、上面視において、その角部又は全体が湾曲している請求項29乃至36のいずれか一項に記載の発光装置の製造方法。
- 前記突起は、前記発光素子を囲む枠状に設けられる請求項29乃至37のいずれか一項に記載の発光装置の製造方法。
- 前記第1の工程において、前記発光素子は、前記配線基板上に複数個配列されており、
前記突起は、前記発光素子の両側に、前記発光素子の配列方向と略平行な方向に延伸する帯状に設けられ、
前記第2の工程において、前記封止部材は、前記両側の突起に跨って設けられ、
前記第2の工程後、前記発光素子と発光素子との間の前記封止部材及び前記配線基板を切断する第3の工程を具備する請求項29乃至38のいずれか一項に記載の発光装置の製造方法。 - 前記突起の少なくとも表面は、臨界表面張力が50mN/m以下の材料により構成されている請求項29乃至39のいずれか一項に記載の発光装置の製造方法。
- 前記第2の工程の前に、前記配線基板と前記突起により構成される基体の前記封止部材の縁が設けられる外向面に限って、又は該外向面及び該外向面より外側の構成面に限って、臨界表面張力が50mN/m以下の被膜を形成する請求項29乃至40のいずれか一項に記載の発光装置の製造方法。
- 前記封止部材の母材は、フェニルシリコーン樹脂を主成分とする請求項29乃至41のいずれか一項に記載の発光装置の製造方法。
- 発光素子と、
前記発光素子が載置される上面の該発光素子の外側に突起が設けられた配線基板と、
前記発光素子を封止する封止部材と、を備え、
前記封止部材の縁の少なくとも一部は、前記突起の上面視外側に向いた外向面に設けられ、且つ、前記外向面に対して又は該外向面と該封止部材の縁の接点において該外向面に接する接平面に対して、略接触角又は接触角未満の角度をなして設けられている発光装置。 - 前記封止部材の縁の少なくとも一部は、前記発光装置の上面視における水平面に対して、前記接触角より大きい角度をなして設けられていることを特徴とする請求項43に記載の発光装置。
- 前記外向面は、凸曲面、又は該凸曲面に連続する下側の面、である請求項43に記載の発光装置。
- 前記外向面は、該外向面に連続する上側の平面からの傾斜角度が45度以下の平面である請求項43に記載の発光装置。
- 前記外向面は、前記配線基板の上面に面するように傾斜している請求項43乃至46のいずれか一項に記載の発光装置。
- 前記封止部材は、前記発光素子を封止する第1封止部と、該第1封止部を封止する第2封止部と、を備え、且つ、前記第1封止部内に限って、前記発光素子から出射される光に励起される蛍光体を含有しており、
前記第2封止部の縁の少なくとも一部は、前記突起の外向面に設けられている請求項43乃至47のいずれか一項に記載の発光装置。 - 前記突起は、前記発光素子を囲む枠状に設けられている請求項43乃至48のいずれか一項に記載の発光装置。
- 前記突起は、該基体の上面視において、その角部又は全体が湾曲している請求項43乃至49のいずれか一項に記載の発光装置。
- 前記突起の少なくとも表面は、臨界表面張力が50mN/m以下の材料により構成されている請求項43乃至50のいずれか一項に記載の発光装置。
- 前記封止部材の母材は、フェニルシリコーン樹脂を主成分とする請求項43乃至51のいずれか一項に記載の発光装置。
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CN201280035302.1A CN103688377B (zh) | 2011-05-16 | 2012-05-15 | 发光装置及其制造方法 |
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EP19166558.7A EP3544067B1 (en) | 2011-05-16 | 2012-05-15 | Light diode emitting device and method for manufacturing the same |
EP12786606.9A EP2711995B1 (en) | 2011-05-16 | 2012-05-15 | Light-emitting device and method for manufacturing same |
US14/118,176 US10090446B2 (en) | 2011-05-16 | 2012-05-15 | Light emitting device and method for manufacturing the same |
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TW201301584A (zh) | 2013-01-01 |
EP3544067A1 (en) | 2019-09-25 |
JPWO2012157644A1 (ja) | 2014-07-31 |
CN103688377B (zh) | 2018-06-08 |
JP5983603B2 (ja) | 2016-08-31 |
CN107768502A (zh) | 2018-03-06 |
US10090446B2 (en) | 2018-10-02 |
CN107768502B (zh) | 2019-07-05 |
EP2711995A4 (en) | 2014-11-26 |
JP6274271B2 (ja) | 2018-02-07 |
CN103688377A (zh) | 2014-03-26 |
EP3544067B1 (en) | 2020-09-09 |
EP2711995A1 (en) | 2014-03-26 |
EP2711995B1 (en) | 2019-06-26 |
JP2016213492A (ja) | 2016-12-15 |
TWI574437B (zh) | 2017-03-11 |
US20140124812A1 (en) | 2014-05-08 |
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