JP2015228320A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin-type luminaire capable of acquiring even surface light emission by suppressing luminance unevenness.SOLUTION: A luminaire includes: a plurality of light sources 10 having solid light emitting elements (LED 11) respectively; a substrate 20 in which the plurality of light sources 10 are arranged; a luminaire body 30 in which the substrate 20 is fixed; and a diffusion panel 40 arranged so as to cover the plurality of light sources 10. The plurality of light sources 10 are arranged at a constant interval P. When a surface on which the light sources 10 are arranged in the substrate 20 is defined as an arrangement surface 20S, each of the plurality of light sources 10 emits light in all directions to the further diffusion panel 40 side than the arrangement surface 20S, and a distance d between each of the plurality of light sources 10 and the diffusion panel 40 is equal to or greater than one time and equal to or less than two times of the interval P.

Description

  The present invention relates to a lighting device.

  Solid light emitting elements such as light emitting diodes (LEDs) are widely used in various devices such as lighting devices and displays as high-efficiency and space-saving light sources. In lighting applications, LEDs are used in various lighting devices such as ceiling lights and downlights installed on the ceiling, or various lamps such as light bulb shaped lamps and straight tube lamps.

  As an example of a lighting device installed on a ceiling, Patent Document 1 discloses an instrument body, a board fixed to the instrument body, a plurality of LEDs mounted on the board, and a fixture body so as to cover the plurality of LEDs. A ceiling light with an attached cover (panel) is disclosed.

JP 2012-146441 A

  In an illumination device using a plurality of light sources, there is a problem that a crushing feeling (bright spot) is conspicuous at the time of lighting, and uneven brightness occurs. In particular, since the LED is a point light source with strong directivity, the luminance unevenness is conspicuous in an illumination device using a plurality of LEDs. For this reason, as a cover that covers a plurality of light sources, a diffusive cover (diffusion panel) is often used.

  On the other hand, depending on the use and purpose of the lighting device and the installation location, illumination light with uniform surface emission may be required.

  However, a thin illuminating device in which the distance between the light source and the diffusion cover is relatively short has a problem that it is difficult to suppress uneven luminance and obtain uniform surface light emission.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a thin illuminating device that can suppress uneven luminance and obtain uniform surface light emission.

  In order to solve the above-described problems, an aspect of the illumination device according to the present invention includes a plurality of light sources each having a solid light-emitting element, a substrate on which the plurality of light sources are arranged, and an instrument body on which the substrate is fixed. And a diffusion panel arranged so as to cover the plurality of light sources, the plurality of light sources are arranged at a constant interval, and a surface on which the light source is arranged on the substrate is an arrangement surface, Each of the plurality of light sources emits light in all directions closer to the diffusion panel than the arrangement surface, and the distance between each of the plurality of light sources and the diffusion panel is 1 to 2 times the interval It is characterized by being.

  Also, one aspect of the lighting device according to the present invention is a plurality of light sources each having a solid light emitting element, a substrate on which the plurality of light sources are disposed, an instrument body on which the substrate is fixed, and the plurality of light sources. And a light guide plate disposed between the diffusion panel and the substrate, wherein the plurality of light sources are disposed at regular intervals, and the light sources on the substrate are When the arranged surface is an arrangement surface, each of the plurality of light sources emits light in all directions on the diffusion panel side with respect to the arrangement surface, and when viewed from the normal direction of the arrangement surface, The light guide plate is an annular shape having an opening, and the plurality of light sources are arranged in the opening of the light guide plate.

  According to the present invention, it is possible to realize a thin illuminating device capable of suppressing unevenness in luminance and obtaining uniform surface light emission.

It is sectional drawing of the illuminating device which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the illuminating device which concerns on Embodiment 1 of this invention. It is a top view which shows the light source and board | substrate in the illuminating device which concerns on Embodiment 1 of this invention. 4 is a cross-sectional view taken along line AA in FIG. It is a figure which shows the light distribution characteristic of the light source in the illuminating device which concerns on Embodiment 1 of this invention. It is a figure which shows the luminance distribution of the illuminating device of a comparative example. It is a figure which shows the luminance distribution of the illuminating device which concerns on embodiment of this invention. It is sectional drawing of the illuminating device which concerns on Embodiment 2 of this invention. It is a disassembled perspective view of the illuminating device which concerns on Embodiment 2 of this invention. It is sectional drawing of the illuminating device which concerns on Embodiment 3 of this invention. It is a disassembled perspective view of the illuminating device which concerns on Embodiment 4 of this invention. It is an enlarged view of the area | region X enclosed with the broken line of FIG. It is an enlarged view of the area | region Y enclosed with the broken line of FIG. It is sectional drawing of the illuminating device which concerns on Embodiment 4 of this invention. It is a top view which shows the light source and board | substrate in the illuminating device which concerns on the modification 1 of this invention. It is sectional drawing which shows the structure of the light source in the illuminating device which concerns on the modification 2 of this invention. It is a figure which shows the light distribution characteristic of the light source in the illuminating device which concerns on the modification 2 of this invention. It is sectional drawing which shows the structure of the light source in the illuminating device which concerns on the modification 3 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Accordingly, numerical values, shapes, materials, components, arrangement positions and connection forms of components shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment 1)
First, the structure of the illuminating device 1 which concerns on Embodiment 1 of this invention is demonstrated using FIGS. 1-4. 1 is a cross-sectional view of a lighting apparatus according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the illumination device. FIG. 3 is a plan view showing a light source and a substrate in the illumination device. 4 is a cross-sectional view taken along line AA in FIG.

  Illumination device 1 according to the present embodiment is a thin luminaire that illuminates the lower side (floor surface, ground surface, wall surface, etc.) by being installed, for example, on a ceiling or wall of a house or the like.

  As shown in FIGS. 1 and 2, the lighting device 1 covers a plurality of light sources 10, a substrate 20 on which the plurality of light sources 10 are arranged, an instrument body 30 to which the substrate 20 is fixed, and the plurality of light sources 10. And a diffusion panel 40 arranged as described above.

  In the present embodiment, an air layer exists between the light source 10 and the diffusion panel 40, and an optical member (such as a light guide plate or another diffusion panel) is disposed between the light source 10 and the diffusion panel 40. Absent. That is, the light emitted from the light source 10 is configured to directly enter the diffusion panel 40.

  As shown in FIG. 3, the plurality of light sources 10 are distributed on the substrate 20 at a constant interval P. Specifically, the plurality of light sources 10 are arranged on the substrate 20 so as to be distributed substantially uniformly in a planar shape (two-dimensional shape). In the present embodiment, except for the outermost light source 10, each light source 10 is arranged such that the distance between adjacent light sources 10 is P. As an example, any one light source 10 except for the outermost periphery using 48 light sources 10 is adjacent to the six light sources 10 at intervals of 60 degrees around the light source, and the six adjacent light sources 10 It arrange | positions so that the space | interval P with the light source 10 may be set to 14 mm. In addition, with respect to one light source 10, it is good to arrange | position so that at least 3 or more light sources 10 may adjoin.

  As shown in FIG. 4, each of the plurality of light sources 10 includes an LED 11 as a solid light emitting element. That is, the plurality of LEDs 11 are arranged dispersed on the substrate 20 so that the pitch between the elements is a constant interval P.

  In the present embodiment, the LED 11 is an LED chip (bare chip) that emits monochromatic visible light, and is directly mounted on the substrate 20. That is, in this embodiment, the substrate 20 and the light source 10 (LED 11) constitute a COB (Chip On Board) type module. The LED 11 is, for example, a blue LED chip that emits blue light when energized. For example, the LED 11 mounted on the substrate 20 is wire-bonded to a metal wiring (not shown) patterned on the substrate 20.

  As shown in FIG. 4, each light source 10 further includes a sealing member 12 that seals the LED 11. As shown in FIG.3 and FIG.4, in this Embodiment, the sealing member 12 is substantially hemispherical, and has sealed each LED11 separately.

  As the sealing member 12, for example, a translucent resin is used. The sealing member 12 in this Embodiment contains the fluorescent substance as a wavelength conversion material which wavelength-converts the light from LED11. The sealing member 12 is, for example, a phosphor-containing resin in which a phosphor and a light diffusing material are dispersed in a silicone resin. As the phosphor, when the LED 11 is a blue LED chip, for example, a YAG yellow phosphor can be used to obtain white light. Note that the sealing member 12 does not need to include a phosphor or a light diffusing material. Further, the light source 10 may be configured without using the sealing member 12 itself.

  The plurality of light sources 10 emit light by power supplied from a power supply unit (not shown) outside the lighting device 1. Specifically, each light source 10 emits light when a current flows through each LED 11. In the present embodiment, a blue LED chip is used as the LED 11 and the sealing member 12 contains a yellow phosphor. That is, the light source 10 is a BY type white LED light source. Thereby, a part of the blue light from the LED 11 is converted into yellow light by the yellow phosphor, and the yellow light and the blue light not absorbed by the yellow phosphor are mixed in the sealing member 12. White light is emitted from the sealing member 12. In the present embodiment, all LEDs 11 have the same characteristics, and all the LEDs 11 emit light simultaneously.

  The board | substrate 20 is a board | substrate for arrange | positioning the light source 10, and is a mounting board | substrate for mounting LED11 in this Embodiment.

  The substrate 20 is, for example, a resin substrate such as a glass epoxy substrate (CEM-3 or the like), a ceramic substrate such as a polycrystalline alumina substrate, or a metal base substrate coated with a metal such as Cu. Although not shown in the drawing, the substrate 20 has a pair of metal wirings that are patterned to supply power to the LEDs 11 and a pair of power that is supplied to the LEDs 11 by receiving direct current power for causing the LEDs 11 to emit light. A power supply terminal is formed.

  As shown in FIG. 4, a white resist (white resist) 21 may be provided on the surface of the substrate 20. The white resist 21 is a white insulating resin film. By forming the white resist 21, the surface reflectance of the substrate 20 can be improved, so that the light extraction efficiency as a module can be improved. Further, by forming the white resist, the insulation (breakdown voltage) of the substrate 20 can be improved, and the metal wiring can be prevented from being oxidized.

  In the present embodiment, the substrate 20 is composed of a plurality of substrate pieces. As shown in FIG. 3, for example, the substrate 20 is divided into two parts, a first substrate piece 20a and a second substrate piece 20b. A plurality of light sources 10 are arranged on each of the first substrate piece 20a and the second substrate piece 20b. The plurality of light sources 10 in each of the first substrate piece 20a and the second substrate piece 20b are arranged such that three or more light sources 10 are adjacent to one light source. Thus, the light source 10 can be easily provided on the substrate 20 by dividing the substrate 20 into a plurality of substrate pieces. That is, an LED module including the light source 10 and the substrate 20 can be easily manufactured.

  The substrate 20 is provided with a first through hole 22 and a second through hole 23 corresponding to each of the first hole 31a1 and the second hole 31a2 provided in the attachment part 31 of the instrument body 30. . For example, six first through holes 22 are provided at equal intervals along the circumferential direction at the outer peripheral end of the substrate 20. A first substrate fixing pin 51 is inserted into the first through hole 22. Further, the second through hole 23 is provided in the central portion of the substrate 20. A second substrate fixing pin 52 is inserted into the second through hole 23. The second substrate fixing pin 52 is provided with an insertion hole for passing a power supply lead wire (not shown). The power supply lead wire is connected to the pair of power supply terminals of the substrate 20 from the outside of the instrument body 20 through the insertion hole of the second substrate fixing pin.

  As described above, since the light source 10 is a COB type, if the surface on which the light source 10 is disposed on the substrate 20 is an arrangement surface (mounting surface) 20S, each of the plurality of light sources 10 is shown in FIGS. Emits light in all directions closer to the diffusion panel 40 than the arrangement surface 20S. That is, when each light source 10 is viewed from the side, the light source 10 has nothing to block the light from the LED 11, so that each light source 10 is viewed from the normal direction of the arrangement surface 20S as shown in FIG. Sometimes the light is emitted in all directions of 360 degrees and, as shown in FIG. 4, when viewed from the normal direction of the vertical section of the arrangement surface 20S, the light axis 10 is in the optical axis (the normal direction of the arrangement surface 20S). On the other hand, light is emitted in the direction of ± 90 degrees.

  FIG. 5 shows the light distribution characteristics of the light source 10 in the present embodiment. As shown in FIG. 5, in the light source 10, the illuminance in the range of +90 degrees to +60 degrees and the illuminance in the range of −60 degrees to −90 degrees are 35% or more of the 0 degree illuminance. As described above, the light source 10 has a wide light distribution angle and a wide light distribution angle as compared with an SMD (Surface Mount Device) type light source in which an LED chip is mounted in the recess of the package.

  As shown in FIGS. 1 and 2, the instrument main body 30 is a housing that forms an outline of the lighting device 1 and a mounting base (base) to which the substrate 20 is attached. The instrument body 30 is formed using a metal material, and is made of aluminum die casting in the present embodiment. In addition, the instrument main body 30 may be formed using materials other than metal materials, such as resin.

  The instrument main body 30 includes an attachment portion 31 for attaching the substrate 20 and a heat sink portion 32 for radiating heat generated by the light source 10. The heat sink 32 is provided on the ceiling side of the recess 31a. In the present embodiment, the attachment portion 31 has a larger diameter than the heat sink portion 32.

  As shown in FIG. 2, the attachment portion 31 includes a bottomed cylindrical concave portion 31a in which the substrate 20 is disposed, and an outer peripheral portion 31b that protrudes outward from the upper end portion of the concave portion 31a. The shape and size of the bottom surface of the recess 31 a are substantially the same as the shape and size of the substrate 20. As an example, the shape of the bottom surface of the recess 31a and the shape of the substrate 20 are circular. Further, the depth of the recess 31 a is deeper than the thickness of the substrate 20. The outer peripheral part 31b is provided in a flange shape so as to protrude radially outward on the entire periphery of the upper end part of the attachment part 31.

  The substrate 20 is placed on the bottom surface of the recess 31 a and fixed to the mounting portion 31. The recess 31a is provided with a first hole 31a1 and a second hole 31a2 corresponding to the first through hole 22 and the second through hole 23 of the substrate 20, respectively. The first hole portion 31a1 has an insertion port into which the first substrate fixing pin 51 is inserted, and six are provided at equal intervals along the circumferential direction at the outer peripheral end portion of the concave portion 31a. Further, the second hole portion 31a2 has an insertion port into which the second substrate fixing pin 52 is inserted, and is provided in the central portion of the concave portion 31a.

  When the substrate 20 is fixed to the instrument body 30, the substrate 20 is placed in the recess 31 a, and the first substrate fixing pin 51 is inserted into the first through hole 22 of the substrate 20 and the first hole 31 a 1 of the instrument body 30. At the same time, the second substrate fixing pin 52 is inserted into the second through hole 23 of the substrate 20 and the second hole 31 a 2 of the instrument body 30. Thereby, while being able to position the board | substrate 20 with respect to the instrument main body 30, the board | substrate 20 can be fixed to the instrument main body 30. FIG.

  In addition, a through hole 31b1 corresponding to the protrusion 41 of the diffusion panel 40 is provided in the outer peripheral portion 31b. When the diffusion panel 40 is fixed to the instrument body 30, the protrusion 41 is inserted into the through hole 31b1. Thereby, while being able to position the diffusion panel 40 with respect to the instrument main body 30, the diffusion panel 40 can be fixed and attached to the instrument main body 30.

  The diffusion panel 40 is an optical member having translucency and light diffusibility, and is made of, for example, a translucent resin material such as acrylic or polycarbonate, a glass material, or the like. The diffusion panel 40 is, for example, a milky white diffusion panel in which a light diffusion material is dispersed. Such a diffusion panel 40 can be manufactured by resin-molding a translucent resin material mixed with a light diffusing material into a predetermined shape.

  Specifically, the diffusion panel 40 has a total light transmittance of 47% to 55%, a diffused light transmittance of 47% to 55%, a haze of 90% to 99%, and a dispersity of 50% to 60%. % Can be used. In this embodiment, the diffuser panel 40 having a total light transmittance of 47%, a diffused light transmittance of 47%, a haze of 99%, and a dispersity of 60% is used.

  The diffusion panel 40 may be configured by forming a milky white light diffusion film including a light diffusion material or the like on the surface (inner surface or outer surface) of the transparent panel, instead of dispersing the light diffusion material inside. Good. Further, the diffusion panel 40 may be configured to have diffusivity by performing diffusion processing instead of using a light diffusing material. For example, it may be configured to have diffusibility by forming fine irregularities on the surface of the transparent panel by applying a surface treatment such as embossing or by printing a dot pattern on the surface of the transparent panel. . Even in the case of diffusion processing, a light diffusing material may be further contained in order to improve diffusibility.

  As shown in FIG. 1, the diffusion panel 40 is a diffusion cover configured to cover all the light sources 10, and is disposed at a position facing the substrate 20.

  For all the light sources 10, the distance (light source-diffusion panel distance) d between the light source 10 and the diffusion panel 40 is the same. The distance d is 1 to 2 times the interval P between the adjacent light sources 10. In the present embodiment, the distance d is set to be approximately equal to the interval P.

  The diffusion panel 40 forms an outline of the lighting device 1, and light from the light source 10 incident on the diffusion panel 40 is diffused in the diffusion panel 40, guided in the diffusion panel 40, and transmitted through the diffusion panel 40. To the outside. That is, since the diffusion panel 40 diffuses and guides the light of the LED 11 that is a point light source with high directivity, the entire diffusion panel 40 functions as a surface light emitting unit that emits pseudo light.

  The diffusion panel 40 configured as described above is attached to the instrument main body 30. In the present embodiment, the diffusion panel 40 is fixed to the outer peripheral portion 31 b of the instrument main body 30 using a plurality of protrusions (dowels) 41 provided on the inner surface of the diffusion panel 40. For example, six protrusions 41 are formed at regular intervals along the circumferential direction so as to protrude from the inner surface of the diffusion panel 40 toward the instrument body 30. When fixing the diffusion panel 40 to the instrument body 30, the protrusion 41 is inserted into the through hole 31 b 1 provided in the outer peripheral part 31 b of the instrument body 30, and the part of the protrusion 41 protruding from the back side of the outer peripheral part 31 b is inserted. Caulking with heat.

  The thickness of the part facing at least the region where the light source 10 is disposed in the diffusion panel 40 is substantially constant. In the present embodiment, the thickness of the diffusion panel 40 is constant in the entire region. The thickness of the diffusion panel 40 is, for example, 1.5 mm to 2.0 mm, and is 2 mm in the present embodiment.

  The illuminating device 1 configured as described above is fixed to the ceiling material in a state where, for example, the heat sink portion 32 of the fixture main body 30 is embedded in a hole provided in the ceiling. In this case, although the diffusion panel 40 and the attachment part 31 of the instrument main body 30 are visually recognized from a ceiling, you may install so that only the diffusion panel 40 may be visually recognized. The lighting device 1 is fixed to the ceiling material by a mounting spring provided on the fixture body 30.

  Next, the effect of the illuminating device 1 which concerns on this Embodiment is demonstrated using FIG. 6A and 6B. FIG. 6A is a diagram showing a luminance distribution of the lighting device of the comparative example, and FIG. 6B is a diagram showing a luminance distribution of the lighting device according to the embodiment of the present invention.

  FIG. 6A shows a case in which the distance (light source-diffusion panel distance) d is 12 mm and the interval (element pitch) P is 14 mm in the illumination device 1 shown in FIGS. FIG. 6B shows the case where the distance d and the distance P are both 14 mm in the lighting device 1 shown in FIGS. 1 to 4, that is, the distance d and the distance P are set to the same value.

  As shown in FIG. 6A, it can be seen that in the illumination device of the comparative example, uneven brightness occurs and uniform surface light emission is not obtained. On the other hand, as shown to FIG. 6B, in the illuminating device 1 in this Embodiment, it turns out that luminance unevenness is suppressed and uniform surface light emission is obtained.

  As described above, at least the distance d between the light source 10 and the diffusion panel 40 is set to be the same (1 times) as the interval P between the adjacent light sources 10, whereby uneven luminance is suppressed and uniform surface light emission can be obtained. it can.

  On the other hand, as the distance d between the light source 10 and the diffusion panel 40 becomes longer, luminance unevenness can be suppressed. However, if the distance d between the light source 10 and the diffusion panel 40 is too long, a thin lighting device cannot be realized.

  Therefore, in the illumination device 1 according to the present embodiment, the upper limit of the distance d between the light source 10 and the diffusion panel 40 is set to twice the interval P between the adjacent light sources 10. Thereby, a thin illuminating device is realizable.

  As described above, according to the lighting device 1 in the present embodiment, the distance d between the light source 10 and the diffusion panel 40 is set to be not less than 1 and not more than twice the interval P between the adjacent light sources 10.

  Thereby, even if it is a thin illuminating device with a short spatial distance of the board | substrate 20 and the diffusion panel 40, the brightness nonuniformity in the diffusion panel 40 can be suppressed and uniform surface light emission can be obtained. That is, it is possible to realize a thin illuminating device that can suppress uneven brightness and obtain uniform surface light emission.

(Embodiment 2)
Next, the illuminating device 2 which concerns on Embodiment 2 of this invention is demonstrated using FIG.7 and FIG.8. FIG. 7 is a cross-sectional view of the lighting apparatus according to Embodiment 2 of the present invention. FIG. 8 is an exploded perspective view of the illumination device.

  As shown in FIGS. 7 and 8, the illuminating device 2 in the present embodiment has a configuration in which a reflector (reflector) 60 is further provided in the illuminating device 1 in the first embodiment.

  The reflection plate 60 is a reflection member that reflects the light from the light source 10 toward the diffusion panel 40, and is disposed between the diffusion panel 40 and the instrument body 30. The reflecting plate 60 is an annular body having an opening, and an inclined reflecting portion 61 whose inner surface shape is a truncated cone surface, and a plurality of projecting piece portions 62 that protrude horizontally outward from the upper end portion of the inclined reflecting portion 61. Have In the present embodiment, the reflecting plate 60 has an annular shape.

  The inclined reflecting portion 61 is a thin frame-like body whose inner surface is an inclined surface, and includes an entrance opening configured to surround all the light sources 10, an exit opening from which light from the light sources 10 exits, an entrance opening, and an exit exit. And a reflecting surface formed between the mouth. Specifically, the inclined reflection portion 61 (reflection surface) is configured such that the inner diameter gradually increases from the entrance to the exit along the optical axis direction. In the present embodiment, the entrance of the inclined reflecting portion 61 is in contact with the arrangement surface 20 </ b> S of the substrate 20.

  As shown in FIG. 8, a plurality of protrusions 61 a are provided on the back surface of the inclined reflection portion 61. For example, six protruding portions 61 a are provided so as to protrude from the inclined reflecting portion 61 toward the instrument body 30. Further, the projection 61a is provided with a screw hole for inserting a screw.

  In the present embodiment, a protrusion 31a3 is provided in the recess 31a of the instrument body 30 in place of the first hole 31a1. The protrusion 31 a 3 is inserted into the first through hole 22 of the substrate 20. Moreover, the through-hole which penetrates from the back side (ceiling side) of the instrument main body 30 is provided in the protrusion part 31a3.

  When the reflecting plate 60, the substrate 20, and the instrument body 30 are fixed, the first through hole 22 of the substrate 20 is inserted into the protruding portion 31a3 of the instrument body 30, and the substrate 20 is placed on the instrument body 30. The reflecting plate 60 is arranged by aligning the protruding portion 61a with the 30 protruding portions 31a3. In this state, a screw is inserted from the back side of the instrument body 30 into the through hole of the protruding portion 31a3 and the screw hole of the protruding portion 61a of the reflecting plate 60. Thereby, the reflecting plate 60 and the instrument main body 30 can be fixed with the substrate 20 interposed therebetween.

  Further, by screwing the reflection plate 60 and the instrument body 30 in this way, the substrate 20 can be pressed by the edge of the reflection plate 60 (the entrance of the inclined reflection portion 61).

  The protruding piece 62 is provided in a flange shape so as to protrude outward in the radial direction at the upper end portion of the reflecting plate 60 (the inclined reflecting portion 61). In the present embodiment, three projecting piece portions 62 are provided.

  As shown in FIG. 8, the projecting piece portion 62 is provided with a through hole 62 a corresponding to the projecting portion 41 of the diffusion panel 40. In the present embodiment, as in the first embodiment, when the diffusion panel 40 is fixed to the instrument body 30, the protrusion 41 of the diffusion panel 40 is inserted into the through hole 31b1 of the instrument body 30 and caulked by heat. At this time, in the present embodiment, the protrusion 41 of the diffusion panel 40 is also inserted into the through hole 62 a of the protrusion 62 of the reflector 60. Thus, the reflector 60 is fixed to the instrument body 30 using the diffusion panel 40 as well.

  The reflector 60 configured as described above may be formed of a hard white resin material such as polybutylene terephthalate (PBT), or a metal-deposited material such as silver or aluminum on a resin-molded one. You may use what formed the film | membrane (metal reflective film). Alternatively, the reflector 60 may be formed of a metal material such as aluminum. When the reflecting plate 60 is formed of a metal material, white coating or the like may be further applied to the inner surface in order to improve reflectivity.

  In the present embodiment, a recessed portion 31b2 is formed in a part of the outer peripheral portion 31b of the attachment portion 31 in the instrument body 30 so as to be recessed outward in the horizontal direction from the recessed portion 31a. In other words, a part in the circumferential direction of the outer peripheral portion 31b is formed so as to project inward in the horizontal direction. In FIG. 8, the recessed portions 31b2 are formed at three locations in the circumferential direction. Due to the presence of the hollow portion 31b2, the shape of the outer peripheral portion 31b of the instrument main body 30 becomes a non-uniform shape along the circumferential direction.

  As described above, the shape of the outer peripheral portion 31b of the appliance main body 30 becomes non-uniform because, for example, attachment springs used when fixing the lighting device 1 to the ceiling material are provided at a plurality of locations (for example, 3). This is because it is provided at a location).

  In this case, in a state where the reflector 60 is attached to the instrument body 30, the projecting piece 62 of the reflector 60 fits into the recess 31 b 2 of the instrument body 30 when viewed from the normal direction of the arrangement surface 20 </ b> S of the substrate 20. Combined. That is, the reflecting plate 60 is attached to the instrument main body 30 so that the protruding piece 62 is fitted in the recess 31b2.

  At this time, the surface on the diffusion panel 40 side of the projecting piece portion 62 of the reflecting plate 60 and the surface on the diffusion panel 40 side of the outer peripheral portion 31 b of the instrument main body 30 are flush with each other. In other words, the surface on the diffusion panel 40 side of the projecting piece 62 and the surface on the diffusion panel 40 side of the outer peripheral portion 31b constitute the same plane without a step. As a result, since the hollow portion 31b2 is filled with the projecting piece portion 62, the outer peripheral portion 31b of the instrument main body 30 can be formed into a uniform shape.

  As described above, also in the lighting device 2 according to the present embodiment, the distance d between the light source 10 and the diffusion panel 40 is set to be not less than 1 and not more than 2 times the interval P between the adjacent light sources 10, thereby suppressing uneven brightness. It is possible to realize a thin illuminating device capable of obtaining a simple surface emission.

  Moreover, in this Embodiment, the protrusion piece 62 of the reflecting plate 60 and the hollow part 31b2 of the instrument main body 30 are fitted, and the surface on the diffusion panel 40 side in the protruding piece portion 62 of the reflection plate 60 The surface on the diffusion panel 40 side in the outer peripheral portion 31b of the instrument main body 30 is flush with the surface. That is, the non-uniform shape of the instrument body 30 is complemented by the reflector 60 so that the instrument body 30 and the reflector 60 have a uniform shape.

  Thereby, it can suppress that the nonuniformity (shadow) of light arises by the nonuniform shape of the instrument main body 30. FIG. Therefore, even if the instrument body 30 has a non-uniform shape, uniform surface emission can be easily obtained.

(Embodiment 3)
Next, the illuminating device 3 which concerns on Embodiment 3 of this invention is demonstrated using FIG.9 and FIG.10. FIG. 9 is a cross-sectional view of the lighting apparatus according to Embodiment 3 of the present invention. FIG. 10 is an exploded perspective view of the illumination device.

  As shown in FIGS. 9 and 10, the illumination device 3 according to the present embodiment has a configuration in which a light guide plate 70 is further provided in the illumination device 1 according to the first embodiment. The light guide plate 70 can be formed of, for example, a translucent resin material.

  The light guide plate 70 is an optical member that guides light from the light source 10 and is disposed between the diffusion panel 40 and the instrument body 30. The light guide plate 70 is an annular body having an opening, and the plurality of light sources 10 are disposed in the opening of the light guide plate 70. That is, the plurality of light sources 10 are surrounded by the light guide plate 70.

  In the present embodiment, the light guide plate 70 has an annular shape, and an inclined light guide portion 71 whose inner surface shape is a truncated cone surface, and a horizontal guide that protrudes outward from the upper end portion of the inclined light guide portion 71 horizontally. And an optical part 72.

  The inclined light guide 71 is a thin frame-like body whose inner surface is an inclined surface, and is formed so as to surround all the light sources 10. Specifically, the inclined light guide 71 is configured such that the inner diameter gradually increases along the optical axis direction.

  The horizontal light guide portion 72 is provided in a flange shape so as to protrude outward in the radial direction on the entire circumference of the upper end portion of the inclined light guide portion 71. As shown in FIG. 10, the horizontal light guide 72 is provided with a through hole 72 b corresponding to the protrusion 41 of the diffusion panel 40. When fixing the diffusing panel 40 to the instrument body 30, the protrusion 41 is inserted into the through hole 72b of the horizontal light guide 72 and the through hole 31b1 of the instrument body 30, and the protrusion 41 is the same as in the first embodiment. The portion that protrudes from the through hole 31b1 is caulked by heat. Thereby, the light guide plate 70 can be fixed to the instrument body 30 together with the diffusion panel 40.

  Although not shown, in the present embodiment, the substrate 20 is fixed to the instrument body 30 using the first substrate fixing pins 51 and the second substrate fixing pins 52 as in the first embodiment.

  Here, the structure which becomes the characteristic of the light-guide plate 70 is demonstrated using FIG. 11A and FIG. 11B. 11A and 11B are enlarged views of a region X and a region Y surrounded by a broken line in FIG. 10, respectively.

  As shown in FIG. 11A, unevenness 71 a (uneven structure) is provided on the inner side surface of the opening of the light guide plate 70. Specifically, the unevenness 71a has a jagged shape in which triangular ridges and triangular valleys are alternately formed when viewed from the normal direction of the arrangement surface 20S of the substrate 20, and has an opening. It forms in the perimeter of the inner surface of the inclination light guide part 71 to comprise.

  Thus, by providing the unevenness 71a on the inner surface of the opening of the light guide plate 70, the light of the light source 10 traveling in the horizontal direction on the arrangement surface 20S of the substrate 20 can be easily taken into the light guide plate 70 and the light guide plate. It can be diffused on the inner surface of the 70 openings.

  In addition, as shown in FIG. 11B, the outer surface of the light guide plate 70 is provided with irregularities 72a (irregular structure). Specifically, the unevenness 72a has a jagged shape in which triangular peaks and valleys are alternately formed when viewed from the normal direction of the arrangement surface 20S of the substrate 20, and the light guide plate It is formed all around the outer surface of the horizontal light guide part 72 constituting the outer edge of 70.

  Thus, by providing the irregularities 72 a on the outer surface of the light guide plate 70, the light guided through the light guide plate 70 is totally reflected on the outer surface of the light guide plate 70 (horizontal light guide portion 72) and is thus inside the light guide plate 70. Can be prevented from being trapped. Therefore, the light extraction efficiency can be improved.

  Furthermore, a dot pattern is formed on the main surface of the horizontal light guide 72. As a result, the light that enters the light guide plate 70 and guides the light guide plate 70 is reflected by the dot pattern in the horizontal light guide portion 72 and is emitted in the direction perpendicular to the surface of the horizontal light guide portion 72. Thereby, light can be effectively incident on the outer peripheral end portion of the diffusion panel 40 which is difficult for direct light to reach and tends to be a shadow. The horizontal light guide 72 may be formed with innumerable dimples, prisms and the like instead of the dot pattern.

  As described above, also in the lighting device 3 according to the present embodiment, the distance d between the light source 10 and the diffusion panel 40 is set to be 1 to 2 times the interval P between the adjacent light sources 10, and thus uniform brightness is suppressed. A thin lighting device capable of obtaining surface emission can be realized.

  Further, in the present embodiment, the plurality of light sources 10 are arranged in the opening of the annular light guide plate 70.

  Thereby, the light source 10 traveling in the horizontal direction of the arrangement surface 20S of the substrate 20 can be diffused. Further, the light source 10 traveling in the horizontal direction of the arrangement surface 20 </ b> S of the substrate 20 can be effectively incident on the light guide plate 70. That is, the light emitted from the side of the light source 10 can be diffused and incident.

  As a result, when viewed from the optical axis direction of the lighting device, the luminance of the outer portion of the diffusion panel 40 tends to be smaller than the luminance of the central portion, but by providing the annular light guide plate 70, Insufficient luminance in the outer peripheral area can be compensated. Therefore, since the luminance in the entire region of the diffusion panel 40 can be made more uniform, more uniform surface light emission can be realized.

  In particular, in the present embodiment, since the inner peripheral surface of the light guide plate 70 is provided with irregularities 71a, the light of the light source 10 traveling in the horizontal direction of the arrangement surface 20S of the substrate 20 is easily taken into the light guide plate 70. And can be diffused. Therefore, the light extraction efficiency at the outer peripheral edge can be further improved, and thus more uniform surface emission can be easily realized.

  Further, it is desirable that the opening end of the light guide plate 70 is located in the vicinity of the outside of the light source 10 located on the outermost periphery on the substrate 20. Specifically, it is desirable that the inner surface of the opening of the inclined light guide 71 that faces the side surface of the light source 10 be close to the light source 10 located on the outermost periphery on the substrate 20.

  Thereby, the light emitted from the side of the light source 10 can be more easily taken into the light guide plate 70 and can be effectively diffused. Therefore, more uniform surface light emission can be realized.

  Further, the outer edge of the light guide plate 70 may be located in the vicinity of the end of the diffusion panel 40. Specifically, the outer edge of the horizontal light guide 72 is preferably located in the vicinity of the end of the diffusion panel 40.

  Thereby, since the light radiate | emitted from the horizontal light guide part 72 becomes easy to inject into the diffusion panel 40, the brightness | luminance deficiency of the area | region of an outer peripheral part can be compensated effectively. Therefore, since the luminance in the entire region of the diffusion panel 40 can be made more uniform, uniform surface light emission can be easily realized.

  Further, by providing the annular light guide plate 70, even if the outer peripheral portion of the instrument body 30 has a non-uniform shape and light non-uniformity (shadow) occurs, It is also possible to alleviate non-uniformity.

(Embodiment 4)
Next, the illuminating device 4 which concerns on Embodiment 4 of this invention is demonstrated using FIG. FIG. 12 is a cross-sectional view of a lighting apparatus according to Embodiment 4 of the present invention.

  As shown in FIG. 12, the illuminating device 4 in the present embodiment has a configuration in which the illuminating device 1 in the first embodiment is provided with the reflection plate 60 in the second embodiment and the light guide plate 70 in the third embodiment. It has become.

  The reflection plate 60 and the light guide plate 70 are disposed between the diffusion panel 40 and the instrument body 30. In the present embodiment, the light guide plate 70 is disposed so as to overlap the reflection plate 60. That is, the light guide plate 70 is disposed on the diffusion panel 40 side, and the reflection plate 60 is disposed on the instrument body 30 side.

  As described above, also in the illumination device 4 according to the present embodiment, the distance d between the light source 10 and the diffusion panel 40 is set to be 1 to 2 times the interval P between the adjacent light sources 10, so that the luminance unevenness is suppressed and uniform. It is possible to realize a thin illuminating device capable of obtaining a simple surface emission.

  Moreover, in this Embodiment, since the reflecting plate 60 and the light-guide plate 70 are used, the effect similar to Embodiment 2 and 3 can be acquired.

(Modification)
As mentioned above, although the illuminating device concerning this invention was demonstrated based on embodiment, this invention is not limited to these embodiment. Hereinafter, a lighting device according to a modification of the present invention will be described.

(Modification 1)
FIG. 13 is a plan view showing a light source and a substrate in an illumination apparatus according to Modification 1 of the present invention.

  The illumination device in the present modification is different from the illumination device in the first embodiment in the layout of the light source 10, and other than that is the same as in the first embodiment.

  Specifically, in the first embodiment, the plurality of light sources 10 are arranged in a distributed manner on the substrate 20, but in the present modification, the plurality of light sources 10 are concentric as shown in FIG. Is arranged. In other words, in the present modification, a plurality of annular light sources configured by arranging a plurality of light sources 10 in an annular shape are arranged in a concentric manner with different diameters. In FIG. 13, the light source 10 on the board | substrate 20 is arrange | positioned so that it may become four annular | circular shaped light sources. In this modification as well, the plurality of light sources 10 on the substrate 20 are arranged at a constant interval P.

  As described above, also in the lighting device in the present modification, uniform surface light emission can be obtained while suppressing luminance unevenness, as in the first embodiment. This modification can also be applied to the second to fourth embodiments.

(Modification 2)
FIG. 14 is a cross-sectional view showing the configuration of the light source in the illumination device according to Modification 2 of the present invention.

  The illumination device in the present modification is different from the illumination device in the first embodiment in the configuration of the light source, and other than that is the same as in the first embodiment.

  Specifically, in this modification, a light source 10A shown in FIG. 14 is used instead of the light source 10 shown in FIG.

  As shown in FIG. 14, the light source 10 </ b> A further includes a translucent member 13 in addition to the LED 11 and the sealing member 12. The translucent member 13 is a submount mounted on the substrate 20, and the LED 11 is mounted on the translucent member 13. The sealing member 12 is formed on the substrate 20 so as to cover the LED 11 and the translucent member 13.

  In the translucent member 13, when the surface on which the LED 11 is mounted is the upper surface and the surface opposite to the upper surface is the lower surface, the translucent member 13 has a refractive index of the upper layer on the lower surface side. It is constituted by a plurality of layers having different refractive indexes stacked so as to be equal to or lower than the refractive index of the layers.

  As shown in FIG. 14, in this modification, the translucent member 13 includes a first layer (lower layer) 13a located on the substrate 20 side and a second layer (upper layer) 13b located on the diffusion panel 40 side. The refractive index of the 1st layer 13a is below the refractive index of the 2nd layer 13b. The translucent member 13 is a two-layer ceramic submant, and the first layer 13a and the second layer 13b are, for example, translucent ceramic layers.

  Since the light source 10A in the present modification is also a COB type, each of the plurality of light sources 10A emits light in all directions closer to the diffusion panel 40 than the arrangement surface 20S, similarly to the light source 10 (FIG. 4) in the first embodiment. Release. The light distribution angle of the light source 10 </ b> A in the present modification is larger than that of the light source 10 in the first embodiment.

  FIG. 15 shows the light distribution characteristics of the light source 10A in this modification. As shown in FIG. 15, in the light source 10A, the illuminance in the range from +90 degrees to +60 degrees and the illuminance in the range from −60 degrees to −90 degrees are 45% or more of the 0 degree illuminance. As described above, the light source 10A has a light distribution characteristic with a larger light distribution angle than the light source 10 in the first embodiment.

  Therefore, the illumination device in the present modification can obtain uniform surface light emission with less luminance unevenness than the illumination device in the first embodiment. This modification can also be applied to the second to fourth embodiments.

(Modification 3)
FIG. 16: is sectional drawing which shows the structure of the light source in the illuminating device which concerns on the modification 3 of this invention.

  The illumination device in the present modification is different from the illumination device in the first embodiment in the configuration of the light source, and other than that is the same as in the first embodiment.

  Specifically, in this modification, the light source 10B shown in FIG. 16 is used instead of the light source 10 shown in FIG.

  As illustrated in FIG. 16, the light source 10 </ b> B further includes a mounting substrate (SMD substrate) 14 in addition to the LED 11 and the sealing member 12. The LED 11 is mounted on the mounting substrate 14. Further, the sealing member 12 is formed on the mounting substrate 14 so as to cover the LEDs 11.

  The light source 10B in the present modification is an SMD type light emitting element, but since a package that covers the side surface of the LED 11 is not used, each of the plurality of light sources 10B is the light source 10 in the first embodiment (FIG. 4). In the same manner as described above, light is emitted in all directions closer to the diffusion panel 40 than the arrangement surface 20S.

  Therefore, the illumination device in the present modification can obtain uniform surface light emission with less luminance unevenness, as in the first embodiment. This modification can also be applied to the second to fourth embodiments.

(Other variations)
In the said embodiment and modification, although the light sources 10, 10A, and 10B were comprised so that white light might be emitted by a blue LED chip and a yellow fluorescent substance, it is not restricted to this. For example, a phosphor-containing resin containing a red phosphor and a green phosphor may be used and combined with this and a blue LED chip to emit white light.

  Moreover, in the said embodiment and modification, although LED11 was made into the blue LED chip, it is not restricted to this. As the LED 11, an LED chip that emits light having a wavelength (color) other than blue may be used. For example, an LED chip that emits ultraviolet light may be used as the LED 11, and in this case, as the phosphor particles, a combination of phosphors that emit light of three primary colors (red, green, and blue) can be used.

  Moreover, in the said embodiment and modification, although the LED chip was illustrated as a solid light emitting element, it is not restricted to this. For example, as the solid-state light emitting element, in addition to the LED chip, a semiconductor light emitting element such as a semiconductor laser, or an EL element such as an organic EL (Electro Luminescence) or an inorganic EL may be used.

  Moreover, in the said embodiment and modification, although fluorescent substance was used as a wavelength conversion material, it is not restricted to this. For example, as the wavelength conversion material, a material containing a substance that absorbs light of a certain wavelength and emits light of a wavelength different from the absorbed light, such as a semiconductor, a metal complex, an organic dye, or a pigment may be used.

  Moreover, in the said embodiment and modification, although the sealing member 12 sealed each LED11 separately, it is not restricted to this. For example, the sealing member 12 may be linearly sealed so as to connect the plurality of LEDs 11. For example, when the LEDs 11 are arranged as shown in FIG. 13, four sealing members 12 may be formed in an annular shape so as to be concentric.

  In addition, the embodiment can be realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, or a form obtained by subjecting each embodiment to various modifications conceived by those skilled in the art. Forms are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Illuminating device 10 Light source 13 Translucent member 20 Substrate 20S Arrangement surface 30 Instrument main body 31a Concave part 31b Outer peripheral part 31b2 Depressed part 40 Diffusion panel 60 Reflecting plate 62 Projection part 70 Light guide plate 71a, 72a Concavity

Claims (9)

A plurality of light sources each having a solid state light emitting device;
A substrate on which the plurality of light sources are disposed;
An instrument body to which the substrate is fixed;
A diffusion panel arranged to cover the plurality of light sources,
The plurality of light sources are arranged at regular intervals,
When the surface on which the light source is arranged on the substrate is an arrangement surface, each of the plurality of light sources emits light in all directions on the diffusion panel side with respect to the arrangement surface,
The distance between each of the plurality of light sources and the diffusion panel is 1 to 2 times the interval. The lighting device according to claim 1, wherein a distance between each of the plurality of light sources and the diffusion panel is substantially equal to the distance. Furthermore, a light guide plate disposed between the diffusion panel and the substrate,
The light guide plate is an annular shape having an opening,
The lighting device according to claim 1, wherein the plurality of light sources are disposed in an opening of the light guide plate. The illumination device according to claim 3, wherein unevenness is provided on an inner surface of the opening of the light guide plate. Furthermore, a reflector disposed between the diffusion panel and the instrument body is provided,
The reflector is an annular body having an opening,
A projecting piece projecting outward is formed at the upper end of the reflecting plate,
The instrument body has a recess that is deeper than the thickness of the substrate and in which the substrate is disposed, and an outer peripheral portion that is formed to be recessed outward from the recess.
When viewed from the normal direction of the arrangement surface, the projecting piece is fitted in the recess,
The lighting device according to claim 1, wherein a surface on the diffusion panel side of the projecting piece portion and a surface on the diffusion panel side of the outer peripheral portion are flush with each other. The substrate comprises a plurality of substrate pieces,
A plurality of light sources are arranged on each of the plurality of substrate pieces,
The lighting device according to any one of claims 1 to 5, wherein the plurality of light sources in each of the plurality of substrate pieces are arranged such that three or more light sources are adjacent to one light source. Each of the plurality of light sources has a translucent member and an LED chip mounted on the translucent member,
In the translucent member, when the surface on which the LED chip is mounted is an upper surface and the surface opposite to the upper surface is a lower surface,
The translucent member is composed of a plurality of layers having different refractive indexes,
The lighting device according to any one of claims 1 to 6, wherein the plurality of layers are stacked such that a refractive index of a layer on an upper surface side is equal to or lower than a refractive index of a layer on a lower surface side. A plurality of light sources each having a solid state light emitting device;
A substrate on which the plurality of light sources are disposed;
An instrument body to which the substrate is fixed;
A diffusion panel arranged to cover the plurality of light sources;
A light guide plate disposed between the diffusion panel and the substrate;
The plurality of light sources are arranged at regular intervals,
When the surface on which the light source is arranged on the substrate is an arrangement surface, each of the plurality of light sources emits light in all directions on the diffusion panel side with respect to the arrangement surface,
When viewed from the normal direction of the arrangement surface, the light guide plate is an annular shape having an opening,
The plurality of light sources are arranged in an opening of the light guide plate. The illumination device according to claim 8, wherein unevenness is provided on an inner surface of the opening of the light guide plate.