JP6349186B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  Currently, replacement of existing lighting such as mercury lamps with energy-saving and long-life lighting using solid state light emitting devices such as light emitting diodes (LEDs) is proceeding. Moreover, in order to make it bright, it is necessary to improve heat dissipation and to supply electric power efficiently to the LED. Moreover, handling at the time of construction becomes easy by reducing the weight of the lighting device.

  In Patent Document 1, a plurality of light-emitting diodes for a light source, a substrate on which the plurality of light-emitting diodes are mounted, a casing in which the substrate is disposed on the lower surface side, and an outer peripheral surface of the casing radially at predetermined intervals. A plurality of flat plate-like heat radiation fins provided integrally with the casing, wherein the outer diameter of the lower portion of the outer edge portion in the radial direction of the heat radiation fin is larger than the outer diameter of the lower portion of the casing. Formed through the outer peripheral surface of the lower part of the casing to allow heat radiation air to flow, and the outer edge of the lower end of each of the radiating fins and the ring-shaped ring are integrated with each other. LED lighting fixtures are described in which the inner edge side of the ring is used as the opening and the ring is formed of a flat plate.

Japanese Patent No. 5158734

  In order to reduce weight while maintaining heat dissipation, the material and shape of the heat sink are important. In the lighting device described in Patent Document 1, a metal heat sink with fins extending to the vicinity of the base is used, and when the lighting device is attached to a high ceiling in a factory or the like, if the lighting device is heavy, There is a risk that the handling of the product will deteriorate. Then, an object of this invention is to provide the illuminating device which reduced weight, maintaining heat dissipation, and improved the workability | operativity at the time of attachment construction.

The lighting device of the present invention is a lighting device including a solid light emitting element, a light source substrate on which the solid light emitting element is mounted, and a base for supplying DC power, and the light source substrate is mounted on a flat portion of a heat sink, the heat sink comprises a metal section having a flat portion, 3 at intervals of 120 degrees substantially radially from the center of the heat sink has a larger surface area than fins made of the resin-made fin resin at least part of the heat sink Metal strength fins formed in places are formed, and the metal part has a reflecting surface that reflects light from the solid state light emitting element and adjusts a light distribution angle.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which reduced in weight and improved the workability | operativity at the time of attachment or removal construction of an illuminating device can be provided.

It is a side view of the illuminating device which concerns on Example 1 of this invention. It is a bottom view of the illuminating device which concerns on Example 1 of this invention. It is a disassembled perspective view of the illuminating device which concerns on Example 1 of this invention. It is a side view of the illuminating device which concerns on Example 2 of this invention. (A) It is a perspective view which shows the lighting fixture which attached the illuminating device of this invention. (B) It is a perspective view which shows the state which attaches an illuminating device to the hanging tool on the reflective shade of a lighting fixture. It is a perspective view of the illuminating device which concerns on Example 3 of this invention. It is a perspective view of the illuminating device which concerns on Example 4 of this invention.

  Hereinafter, Examples 1 to 4 will be described with reference to the drawings.

  In the present embodiment, in the lighting device S in which the flat portion is formed on the heat sink and at least some of the fins are made of resin, the heat dissipation is equivalent to the case where the heat sink is entirely made of metal. An example of the lighting device S that achieves both weight reduction and improved workability during mounting will be described. In addition, improving workability at the time of attachment is hereinafter referred to as saving construction. 1 is a side view according to Embodiment 1 of the present invention, FIG. 2 is a bottom view thereof, and FIG. 3 is an exploded perspective view thereof. In this embodiment, the upper surface of the paper surface is defined as the upper side (the base side), and the lower surface of the paper surface is defined as the lower side (the cover side).

  In the illumination device S of the present invention, DC power is supplied from the base 5a to the LED module 6 which is a solid light emitting element. In addition, a protection circuit for preventing overcurrent or the like is provided as necessary. When a protection circuit is inserted, it is possible to prevent a failure of the LED module such as when an overcurrent flows or when it is mistakenly connected to a drive power circuit of an existing mercury lamp.

  As shown in FIG. 3, the heat sink 1 includes a metal part 2, a resin case 1 a, fins 1 b, and strength fins 1 c connected to the side surfaces of the support case 3. The metal part 2 is inside the truncated cone-shaped case 1a. In order to improve the heat dissipation and the strength of the heat sink, some of the fins 1b and the strength fins 1c may be made of metal. A translucent cover 4 is fixed to the lower part of the case 1a with a sealing packing 7 interposed therebetween. The sealing packing 7 is a component made of rubber or the like and having a ring shape. The support case 3 and the heat sink 1 are fixed by screws with a sealing packing 8 interposed therebetween.

<Heatsink>
The heat sink 1 is composed of a metal part 2 made of metal, a case 1a made of resin, fins 1b, and strength fins 1c. By using the metal part 2, the heat generated in the LED module 6 is efficiently transmitted to the resin part. The metal part 2 is made using techniques such as aluminum casting, aluminum alloy die casting, and magnesium alloy die casting. Further, by covering the outer surface of the metal part 2 with a resin, the step of painting the outer surface and improving the emissivity can be omitted, so that it can be produced at low cost.

  The metal part 2 of the heat sink 1 has a reflecting surface 2r that reflects light from the LED module 6 and adjusts the light distribution angle. The reflection surface 2r only needs to have a function of reflecting the light from the LED module 6, and a reflective material with a high reflectance may be applied or a highly reflective film or the like may be attached. By using a reflective material or film having a high reflectance, the total luminous flux can be increased as compared with the case where it is not used. When the total luminous flux is increased, the power consumption required to obtain the same total luminous flux can be reduced, which saves energy. Or since the power consumption which can be thrown in can be improved, the brighter illuminating device S can be provided.

  Furthermore, since the fin 1b can be enlarged by forming the reflective surface 2r, the heat dissipation can be improved, and the temperature of the LED module 6 can be reduced, so that the luminous efficiency of the LED module 6 is improved. It can be brighter.

  Further, the reflection surface 2r may be formed separately from the metal part 2. Compared with aluminum die-casting, it is made lighter than the case where the reflecting surface 2r is formed on the metal part 2 by reducing the mass of the metal part 2 by using a thin sheet metal, resin, etc. it can.

  The resin portion of the heat sink 1 includes a case 1a, fins 1b, and strength fins 1c. The resin portion of the heat sink 1 is preferably insulative because it is in contact with the base 5a that supplies current to the LED module 6, and the resin portion of the heat sink 1 uses a resin such as polycarbonate or polybutylene terephthalate. . In addition, if fine particles such as aluminum nitride, alumina, silica, boron nitride are mixed in the resin portion of the heat sink 1, the thermal conductivity can be improved and the heat dissipation can be improved, and also high electrical insulation can be achieved. it can. Moreover, the case 1a is a shape which follows the external shape of the metal part 2, and thickness is about 1-5 mm. Since the thermal conductivity of a general resin is lower than that of a metal, the resin should be as thin as possible within a range that maintains the strength, and the shape conforming to the outer shape of the metal portion 2 is better. Further, it is desirable that the gap between the metal part 2 and the resin part of the heat sink 1 is narrowed and closely adhered to reduce the contact thermal resistance.

  When the metal part 2 and the resin part are integrally molded using an insert mold, the gap between the metal part 2 and the resin part can be reduced, so that heat dissipation can be improved. Moreover, when using an insert mold, if the metal part 2 is provided with a hole (anchor) to fix the metal part 2 to the resin part, the moldability is improved.

  In order to prevent the cap 5a from loosening and dropping due to shaking or the like during an earthquake, it is more preferable for safety to attach a fall prevention chain that connects the lighting device S to a ceiling beam or the like. When attaching the fall prevention chain, if it is attached to a part of the metal part 2 or the metal fin, the connection part of the fall prevention chain can be prevented from being damaged due to shaking during an earthquake or the like, and the reliability is improved.

<Fin 1b>
The plurality of fins 1b are erected from the center of the lighting device S radially outward from the outer surface of the case 1a to the side surfaces and the upper portion.

  Since the fin 1b is erected outward from the outer surface of the case 1a, the heat transmitted to the heat sink 1 can be efficiently radiated to the external space on the side of the case 1a via the fin 1b. it can.

  Further, since the fin 1b is erected outward from the outer surface of the case 1a, heat transmitted to the heat sink 1 is efficiently transferred to the external space above the case 1a via the fin 1b. It can dissipate heat.

  As shown in FIG. 1, the fin 1 b gradually increases in thickness as it goes downward from the top. Due to the shape of the fin 1b having such a changed thickness, when the resin portion of the heat sink 1 is molded, the vertical die cutting can be performed satisfactorily.

<Strength fin 1c>
The strength fin 1c is a strength member of the heat sink 1 and also has a heat dissipation function as a fin. When the strength fin 1c is made of metal and the fin 1b is made of resin, the strength of the heat sink 1 can be improved and the reliability can be improved. Further, if the strength fins 1c and fins 1b are all made of resin, the weight can be reduced by about 10% compared to the case where only the strength fins 1c are made of metal.

  Three strength fins 1c are formed on the upper surface and outer surface of the case 1a radially outward from the center of the lighting device S from the center to the outside.

  The single strength fin 1c has a larger surface area than the single fin 1b.

  Since the fins 1b are erected outward from the outer surface of the case 1a, the heat of the heat sink 1 can be efficiently radiated to the external space on the side of the case 1a via the strength fins 1c.

  Further, the strength fin 1c is erected from the outer surface of the case 1a toward the upper outer side, so that the heat of the heat sink 1 is efficiently radiated to the external space above the case 1a via the strength fin 1c. be able to.

  In addition, the strength fins 1c are formed radially from the center of the heat sink 1 at an interval (pitch) of approximately 120 degrees, so that the air heated by the heat of the LED module 6 when the lighting device S is installed obliquely. Since the direction of the flow of the light is changed by hitting the strength fin 1c, there is an effect that it is easy to flow above the lighting device S and is excellent in heat dissipation.

  Thus, in the heat sink 1, the heat dissipation of the heat sink 1 is improved by the three large strength fins 1c having a length up to the central portion and the small fins 1b therebetween.

<LED board 61>
As shown in FIG. 2, the LED board 61 which is a light source board is being fixed to the inner surface of the metal part 2 by screwing. When the LED module 6 is arranged avoiding a hole or the like through which the wiring formed in the metal part 2 passes, the distance between the LED module 6 and the metal part 2 is short, so that heat is transmitted well and heat dissipation is improved. Further, when the LED module 6 is arranged so as to overlap with the vertical projection of the fin 1b as shown in the LED arrangement position 60, the heat generated in the LED module 6 is well transmitted to the fin 1b at a short distance. This improves heat dissipation.

Further, if a notch or the like is provided in a part of the outer peripheral portion of the LED substrate 61 and the metal part 2 is formed with a structure that is paired with the notch, it is easy to assemble at the time of assembly.
<Support case 3>
The support case 3 shown in FIGS. 1 and 3 is a cylindrical resin member. The material of the support case 3 is preferably a resin having good heat resistance, high strength, and glossy surface. For example, polycarbonate is used as the material of the support case 3. The support case 3 also serves as an insulating material between the base 5 a and the LED module 6.

  As shown in FIG. 3, the support case 3 has a truncated cone-shaped cone portion 3a formed from the lower edge portion to the central upper portion, and a cylindrical cylindrical portion 3b formed at the upper portion of the cone portion 3a. A base attaching portion 3c into which a male screw is threaded is formed on the upper portion of the cylindrical portion 3b.

  By forming the cylindrical cylindrical portion 3b in the support case 3, the cylindrical cylindrical portion 3b can be reliably gripped when the support case 3 and the lighting device S are chucked by a machine. Further, the cylindrical portion 3b is easily grasped when the worker holds the support case 3 or the lighting device S.

  A case mounting flange 3a1 is formed on the lower edge portion of the conical portion 3a so as to protrude to the outer diameter side in a disc shape. A packing mounting flange 3a2 is formed in a disk shape so as to protrude outward from the case mounting flange 3a1.

   The resin part of the support case 3 and the heat sink 1 is attached with the sealing packing 8 interposed therebetween. It may be welded without using the sealing packing 8 or may be bonded with an adhesive or a sealant. Further, the support case 3 and the resin portion of the heat sink may be integrated, and the number of assembling steps and molds can be reduced, so that the cost is reduced. Moreover, since the screw at the time of attachment can be reduced, it becomes lightweight.

  When the support case 3 and the heat sink 1 are separated, the length of the support case 3 can be adjusted according to the size of the lighting fixture. At this time, considering the size of an existing lighting fixture for a mercury lamp, for example, the reflective shade K1 shown in FIG. 5, the length of the support case 3 is preferably 170 mm or more, but the reflective shade K1 shown in FIG. Considering the case of using without mounting, it may be shorter than this.

  If the length of the support case 3 is such that the case 1c protrudes from the opening on the lower surface of the reflective shade K1, the fins 1b and the strength fins 1a come into contact with the air that is cooler than the air inside the reflective shade K1, thereby improving heat dissipation. Can be made. Moreover, since the fin 1b and the intensity | strength fin 1c do not hit a reflective shade, the choice of the instrument to which it is attached spreads. For example, the fin is attached even when the outer diameter size of the fin is larger than the opening of the reflective shade. In addition, since the strength fins 1c and fins 1b having the outermost diameter larger than the inner diameter of the reflective shade K1 can be attached, the amount of heat radiation can be improved. Therefore, the power that can be input to the LED module 61 can be increased, the total luminous flux can be improved, and the bright lighting device S can be provided. Furthermore, in order to improve heat dissipation, the strength fins 1c and fins 1b may be made of metal. When the power supplied to the LED module 61 is 100 W or more, it is possible to make the lighting device S brighter by giving priority to heat dissipation and making the heat sink 1 made of metal.

When the support case 3 and the heat sink 1 are separated, they are assembled from different materials, so that the support case 3 is made of a general resin, and the resin portion of the heat sink 1 is made of a highly thermally conductive resin, so that the cost is low. The heat dissipation can be improved.
<Base assembly 5>
The base assembly 5 (see FIG. 3) has a cylindrical base 5a in which a screw is formed and an insulating plate 5b. The base 5a is made of aluminum or brass. The insulating plate 5b insulates the plus side and the minus side of the lighting device S.
<Assembly and installation of lighting device S>
As shown in FIG. 3, the base assembly 5 to which the base 5a and the insulating plate 5b are fixed is formed.

  After the base assembly 5 is screwed to the base attachment portion 3 c of the support case 3, the crimping portion 5 a 1 (see FIG. 1) of the base 5 a is crimped to the concave portion of the support case 3 and fixed.

  The resin portion of the heat sink 1 is fixed by the support case 3 and screws with the sealing packing 8 interposed therebetween.

  The metal part 2 and the resin part of the heat sink 1 are assembled by fitting the metal part 2 and the resin part or screwing together with the heat sink 1 when the LED board 61 is mounted on the inner surface of the metal part 2. It is done.

  Thereafter, the translucent cover 4 is fixed to the lower end portion of the case 1a of the heat sink 1 by screwing six places with the sealing packing 7 interposed therebetween. Thereby, the illuminating device S shown to FIGS. 1-3 is assembled.

  Applying grease having good thermal conductivity and high electrical insulation to the surface where the LED board 61 and the metal part 2 of the heat sink 1 are combined reduces the air interposed between the gaps between the LED board 61 and the heat sink. Thermal conductivity can be improved, and heat dissipation can be improved.

  FIG. 4 shows a side view of the second embodiment of the present invention, and FIG. 5 shows an example when the embodiment of the present invention is put in the reflective shade K1. On the lower surface side of the translucent cover, there is a protruding portion 1b2 from which the fin 1b protrudes.

  Air around the lighting device S enters from the projecting portion 1b2 which is a portion projecting downward into the space between the fin 1b and the adjacent fin 1b or between the fin 1b and the adjacent strength fin 1c. Heated while exchanging heat with 1b and the strength fin 1c, it flows upward. The air temperature in the vicinity of the outer surface of the heat sink 11 is lowest in the vicinity of the protruding portion 1b2, which is a portion protruding downward. When the temperature difference between the outer surface of the heat sink 11 and the air in the vicinity of the outer surface is large, the efficiency of heat exchange is high. Therefore, by forming the protruding portion 1b2 that is a portion protruding below the lower edge 1u of the case, Heat can be transferred to a portion where the air temperature near the outer surface of the heat sink 11 is low and heat exchange efficiency is high, and heat dissipation can be improved. The inclined surface 1b1 is a part of the protruding portion 1b2.

  When the lighting device S is put in a lighting fixture such as the reflective shade K1, the upper side of the heat sink 11 is covered with the reflective shade K1 and the convection and radiation are hindered. Compared with the heat dissipation. However, by providing the protruding portion on the lower side, the surface area near the air inlet to the heat sink 11 can be increased as compared with the case where there is no protruding portion, so that heat dissipation can be improved.

  When the heat dissipation is improved, the lifetime of the light source can be extended by suppressing the temperature rise of the light source, and the reliability of the lighting device S can be improved. In addition, the luminous efficiency of the LED is temperature dependent, and when the light source temperature is lowered, the luminous efficiency of the LED is improved, so that it becomes easy to provide the lighting device S with reduced power consumption.

  The longer the protrusion 1b2 extends downward, the better the heat dissipation. However, the weight and the optical loss due to the light absorption at the protruding portion 1b2 that protrudes downward increase, so that considering the weight reduction of the heat sink 11 and the optical loss, the protrusion with respect to the opening diameter of the heat sink 11 protrudes. It is desirable that the ratio of the lengths of the portions is about 0.02 to 0.2. Further, in order to prevent an increase in optical loss due to light absorption at the protrusion 1b2, it is preferable to apply a paint having a high light reflectance. Further, by applying a paint having a high light reflectance and a high emissivity, the heat dissipation can be further improved. If the material of the protruding portion 1b2 is made of a translucent material, optical loss due to light absorption by the protruding portion 2 can be reduced.

  When the fin 1b has a structure having a lower edge of the case 1a of the heat sink 11 and a protruding portion 1b2 that protrudes below the translucent cover 4, the lighting device according to the present embodiment is provided on a floor, a desk, or the like. When S is placed, the protruding portion 1b2 serves as a support and can be placed in a stable state, so that it is easy to handle and saves construction.

  Moreover, when the illuminating device S of the present embodiment is placed on a floor, a desk or the like at the time of construction, the translucent cover 4 is not directly in contact with the floor, so that the translucent cover 4 is hardly damaged. Therefore, it is possible to prevent an increase in optical loss due to breakage of the translucent cover 4 or damage to the surface of the translucent cover 4.

  Furthermore, since it is attached by putting a finger in the gap between the protruding portion 1b2 and the protruding portion 1b2, it is easy to attach to the lighting fixture, and the construction is saved.

  FIG. 6 shows a third embodiment of the present invention. In general, resin has lower thermal conductivity than metal used for die-casting, etc. Therefore, in order to shorten the distance of heat generated in the LED module 6, the number of fins 1c2 is increased and the surface area of the fins 1c2 is increased. It's better to do it. This prevents a reduction in heat dissipation when changing from metal to resin due to weight reduction.

  Moreover, if the metal part 2 is formed by press working, the weight can be further reduced. When press working is used, screw holes can be formed by burring, and the LED substrate 61 and the resin portion of the heat sink 12 and the metal portion 2 are integrally screw-fixed. At that time, the resin portion is shaped so as to avoid interference with the burring portion. Further, a nut may be provided on the upper surface of the heat sink 1 and fixed with a bolt and a nut. The place where the reflecting surface 2r is formed may be a metal or resin that is separate from the metal part 2.

  When the heat sink 12 is molded by insert molding, the adhesion between the metal part 2 and the resin part can be improved, and the heat dissipation can be improved.

  Further, as in the second embodiment, providing a protrusion on the lower surface of the case can improve heat dissipation.

The support case 32 may be either integral with the heat sink 12 or separate. When integrated, the number of assembling steps and molds can be reduced, resulting in low costs. Moreover, since the screw at the time of attachment can be reduced, it becomes lightweight.
When the support case 32 and the heat sink 12 are separated, the length of the support case 3 can be adjusted according to the size of the lighting fixture. Moreover, since it will be assembled with another material when it is a separate body, the support case 3 uses a general resin, and the resin part of the heat sink 1 uses a high thermal conductivity resin to improve heat dissipation at low cost. be able to.

  FIG. 7 shows a fourth embodiment of the present invention. In this embodiment, without using the base 5a, the mounting arm 10 is used to attach directly to the ceiling using an anchor bolt, or the mounting hole 11 is attached to the round exposure box through a screw.

  Compared with the case of attaching using the base 5a, since it can fix firmly, the fall of the illuminating device S by the shaking at the time of an earthquake, etc. can be prevented. Further, the lead wire from the LED substrate 61 is connected to a power source via the power terminal block 12 provided on the mounting arm 10. A protection circuit for preventing overcurrent or the like may be provided in the vicinity of the power terminal block 12 or in the heat sink 13.

  After assembling in the same manner as in Example 1, the attachment arm 10 is attached. The mounting arm 10 is connected and fixed to a part of the metal part 2 of the heat sink 13. By fixing the mounting arm 10 to the metal part 2, the mounting strength can be maintained as compared with the case of fixing to the resin part. Further, if a mechanism capable of changing the attachment angle is provided in the vicinity of the attachment portion of the attachment arm 10 and the heat sink 13, the attachment work to the ceiling is facilitated.

  Further, if the shape of the mounting arm 10 is a shade shape that covers the heat sink 13, dust can be prevented from accumulating on the fins 13b. Since the deterioration of the heat dissipation due to dust accumulation can be suppressed, the reliability of the lighting device S can be improved.

1, 12 Heat sink 1a, 12a, 13a Case 1b, 12b, 13b Fin 1b1 Inclined surface 1b2 Projection 1c, 12c, 13c Strength fin 1u Lower edge 2 of the case Metal part 2r Reflective surface 3, 32, 33 Support case 3a Conical part 3a1 Case mounting flange 3a2 Packing mounting flange 3b Cylindrical portion 3c Base mounting portion 4 Translucent cover 5 Base assembly 5a Base 5a1 Crimping portion 5b of base 5a Insulating plate 6 LED module 7, 8 Sealing packing 10 Mounting arm 11 Mounting hole 12 Power supply terminal block 60 LED arrangement position 61 LED substrate S Lighting device K1 Reflecting shade K2 Hanging tool

Claims (2)

In a lighting device comprising a solid-state light-emitting element, a light source substrate on which the solid-state light-emitting element is mounted, and a base for supplying DC power,
The light source substrate is mounted on a flat portion of a heat sink,
The heat sink comprises a metal section having a flat portion, 3 at intervals of 120 degrees substantially radially from the center of the heat sink has a larger surface area than fins made of the resin-made fin resin at least part of the heat sink Metal strength fins that are formed are formed,
The illuminating apparatus according to claim 1, wherein the metal part has a reflecting surface that reflects light from the solid state light emitting element to adjust a light distribution angle. The lighting device according to claim 1.
The said metal part, the said resin- made fin, and the said metal-made strength fin are integrally molded using an insert mold, The lighting device characterized by the above-mentioned .