JP7042683B2 - Lighting equipment - Google Patents

Description

The present invention relates to a lighting device using an LED or the like.

In recent years, instead of fluorescent lamps and light bulbs, lighting devices using semiconductor light emitting elements such as LEDs (Light Emitting Diodes) as light sources have been used. Further, for example, a lighting device using a light emitting element as a light source is also used as a light source for visual inspection of a painted surface of home appliances and passenger cars.

As a lighting device, a device that is inclined in the direction of light emission of a semiconductor light emitting element and whose tip is fixed by a screw or the like is known (see Patent Document 1).

Japanese Patent Publication No. 2004-512644

However, the technique disclosed in Patent Document 1 has a risk of diffuse reflection at that location due to the presence of screws or the like.

The lighting device according to the embodiment of the present invention includes a plurality of light emitting devices, a housing, and a reflector. A light emitting element is mounted on each of the plurality of light emitting devices. A plurality of light emitting devices are mounted on the housing. The reflector is located inside the housing and has a bottom surface and a side surface continuously located on the bottom surface, and the side surface reflects light emitted outward from a plurality of light emitting devices to emit a plurality of light sources. Above the device, it has an inclined plane whose tip extends outward from the plurality of light emitting devices. The housing has a protrusion for fixing the tip of the inclined plane of the reflector. The protrusion has a bent portion that protrudes inward of the housing and bends toward the bottom surface. The tip is located inside the bend.

According to the lighting device according to the embodiment of the present invention, diffused reflection of light can be reduced.

It is sectional drawing of the lighting apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the lighting apparatus which concerns on one Embodiment of this invention. It is a perspective view of the reflector of the lighting apparatus which concerns on one Embodiment of this invention. It is a top view of the reflector of the lighting apparatus which concerns on one Embodiment of this invention. It is a perspective view of the lighting apparatus which concerns on one Embodiment of this invention. It is a top view of the lighting apparatus which concerns on one Embodiment of this invention. It is an exploded perspective view of the lighting apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the light emitting device of the lighting device which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the lighting device according to the embodiment of the present invention will be described with reference to the drawings. It should be noted that the upper and lower parts of the drawing are provided merely for explaining the embodiment of the present invention, and in reality, the upper and lower parts may change depending on the usage situation.

<Construction of lighting equipment>
FIG. 1 is a cross-sectional view of a lighting device according to an embodiment of the present invention. FIG. 2 is a cross-sectional exploded view of the lighting device according to the embodiment of the present invention. FIG. 3 is a perspective view of a reflector of a lighting device according to an embodiment of the present invention. FIG. 4 is a plan view of a reflector of a lighting device according to an embodiment of the present invention. FIG. 5 is a perspective view of the lighting device according to the embodiment of the present invention. FIG. 6 is a plan view of the lighting device according to the embodiment of the present invention. FIG. 7 is an exploded perspective view of the lighting device according to the embodiment of the present invention. FIG. 8 is a cross-sectional view of a light emitting device of the lighting device according to the embodiment of the present invention. In these figures, the lighting device 10 includes a plurality of light emitting devices 1, a housing 11, and a reflector 14. A light emitting element 3 is mounted on each of the plurality of light emitting devices 1. A plurality of light emitting devices are mounted on the housing 11 via the wiring board 12. The reflector 14 is located inside the housing and has a bottom surface 15 and a side surface 16 continuously located on the bottom surface 15, and the side surface 16 emits light emitted outward from a plurality of light emitting devices 1. It has an inclined surface 16 that reflects and has a tip 17 extending outward from the plurality of light emitting devices 1 above the plurality of light emitting devices 1. The housing 11 has a protrusion 18 for fixing the tip 17 of the inclined surface 16 of the reflector 14.

The lighting device 10 is provided with a long housing 11 that is open upward, a light emitting device 1 that is arranged in a line in a longitudinal direction in the housing 11, and a plurality of light emitting devices 1. It is provided with a long wiring board 12 and a long diffusion cover 13 that is supported by the housing 11 and closes the opening of the housing 11. At this time, the housing 11 may have a circular shape. In the case of a circular shape, the plurality of light emitting devices 1 are preferably arranged in a circular shape. The reflector 14 should also have a circular shape when viewed from above. In this case, the protrusion 18, which will be described later, should not be located on the long side, but should be located along the circular edge.

As shown in FIG. 1, the housing 11 has a function of holding the reflector 15 and the diffusion cover 13 and a function of dissipating the heat generated by the light emitting device 1 to the outside. The housing 11 is made of, for example, a metal such as aluminum, copper or stainless steel, a resin composite material containing plastic or the like. The housing 11 has a bottom portion 21a extending in the longitudinal direction and a pair of support portions 21b extending in the longitudinal direction from both ends in the width direction of the bottom portion 21a, and is open on both sides in the upward and longitudinal directions. It is composed of a long main body portion 21 and two lid portions 22 that close the openings on one side and the other side in the longitudinal direction of the main body portion 21, respectively. An upper portion of each support portion 21b inside the housing 11 is provided with a holding portion formed so that recesses for holding the diffusion cover 13 face each other along the longitudinal direction. The length of the housing 11 in the longitudinal direction is set to, for example, 100 mm or more and 2000 mm or less. Further, it may have a circular shape in a plan view.

The wiring board 12 is fixed to the bottom portion 21a in the housing 11 by screwing or the like. As the wiring board 12, for example, a printed circuit board such as a rigid board, a flexible board, or a rigid flexible board is used. The wiring pattern of the wiring board 12 and the wiring pattern of the substrate 2 in the light emitting device 1 are electrically connected via solder or a conductive adhesive. Then, the signal from the wiring board 12 is transmitted to the light emitting element 3 via the board 2, and the light emitting element 3 emits light. Power is supplied to the wiring board 12 from an external power source via wiring.

The diffusion cover 13 is made of a material through which light emitted from the light emitting device 1 is transmitted, and is made of a light-transmitting material such as acrylic resin or glass. The diffusion rate is 30 to 70%. When the diffusion rate is 30% or more, the graininess of light can be reduced and glare can be suppressed. Further, when the diffusion rate is 70% or less, it becomes easy to maintain the brightness of the illumination. The diffusion cover 13 is a rectangular plate body, and the length in the longitudinal direction is set to, for example, 98 mm or more and 1998 mm or less. The diffusion cover 13 is inserted into the recess formed in each of the above-mentioned support portions 21b from the opening on one side or the other side in the longitudinal direction in the main body portion 21, and is slid along the longitudinal direction to cause a plurality of light emission. It is supported by a pair of support portions 21b at a position away from the device 1. Then, the lighting device 10 is configured by closing the openings on one side and the other side in the longitudinal direction of the main body portion 21 with the lid portion 22.

The housing 11 may have a fixing portion for fixing the diffusion cover 13. The diffusion cover 13 is slid and fixed between the protrusion 18 for fixing the reflector 14 described later and the fixing portion. By sliding and attaching the diffusion cover 13, the lighting device 10 can be easily assembled and the productivity can be improved.

The reflector 14 is located inside the housing 11. If there is a wiring board 12, it is located above the wiring board 12. The reflector 14 has a bottom surface 15 and a side surface 16 located continuously with the bottom surface 15. The side surface 16 reflects light emitted outward from the plurality of light emitting devices 1, and is an inclined surface whose tip extends outward from the plurality of light emitting devices 1 above the plurality of light emitting devices 1. (Hereinafter referred to as an inclined surface 16).

The reflector 14 may be made of polyethylene terephthalate. The reflector 14 may have elasticity like polyethylene terephthalate, and in the case of elasticity, the possibility of damage is reduced even when the reflector 14 comes into contact with the side surface of the light emitting device 1. Further, as will be described later, when it is fixed to the housing 11, it can be flexibly deformed, and the lighting device 10 can be easily assembled.

As shown in FIGS. 3 and 4, the reflector 14 has a through hole 19. In this case, a part of the plurality of light emitting devices 1 is housed in the through hole 19, and the tip of each light emitting device 1 protrudes from the through hole 19 in the direction of the diffusion cover 13. Therefore, the through hole 19 is located so as to overlap with the plurality of light emitting devices 1. Further, the through hole 19 may have, for example, a shape similar to the arrangement of a plurality of light emitting devices 1 and may be rectangular in a plan view. Further, it may have a circular shape.

The inclination angle of the inclined surface 16 of the reflector 14 is an angle with respect to the bottom surface 15, and is, for example, 120 ° to 160 °. With this size, the light intensity can be increased when the light emitted from the light emitting device 1 is radiated to the outside.

The housing 11 has a protrusion 18 for fixing the tip 17 of the reflector 14. The protrusion 18 can prevent the inclined surface 16 of the reflector 14 from shrinking inward, that is, extending and spreading along the bottom surface 15 of the reflector 14. Therefore, in assembling the lighting device 10, since the reflector 14 is plastic, as shown in FIG. 2, the reflector 14 is mounted from above the light emitting device 1 so that the light emitting device 1 protrudes from the through hole 19 of the reflecting plate 14. It can be easily inserted and the tip 17 of the reflector 14 can be easily fixed to the protrusion 18. Further, since the tip 17 of the reflector 14 is fixed to the protrusion 18, screwing is not required. That is, the lighting device can be easily assembled and the productivity can be improved.

At this time, since screwing is not required, it is possible to reduce the possibility that the light emitted from the light emitting device 1 hits the screw or the like and causes diffuse reflection. Moreover, since the process of screwing itself can be reduced, it can be easily assembled.

At this time, as shown in FIG. 1, the protrusion 18 may have an inclined portion 20. By having the inclined portion 20, it is possible to further prevent the reflector 14 from shrinking inward. At this time, when the inclination angle of the inclined portion 20 is larger than that of the inclined surface 16, this effect can be more easily obtained. The inclination angle of the inclined portion 20 is the size with respect to the plane of the diffusion cover 13, and the angle of the inclined surface 16 to be compared is also the size with respect to the plane of the diffusion cover 13.

The above-mentioned lighting device 10 is a linear light emitting lighting device in which a plurality of light emitting devices 1 are linearly arranged, but the lighting device 10 is not limited to this, and a surface in which a plurality of light emitting devices 1 are arranged in a matrix or a houndstooth pattern. It may be a light emitting lighting device.

Further, in the lighting device, the distance from the upper surface of the light emitting device 1 to the diffusion cover 13 may be 1 times or more and 4 times or less the distance between the plurality of light emitting devices 1. If the distance from the upper surface of the light emitting device 1 to the diffusion cover 13 is 1 times or more the distance between the plurality of light emitting devices 1, the graininess of the light becomes small and glare can be suppressed. Further, if it is 4 times or less, it is possible to prevent the lighting device 10 itself from becoming large, which can lead to an improvement in productivity.

<Structure of light emitting device>
For example, as shown in FIG. 8, the light emitting device 1 includes a substrate 2, a light emitting element 3, a frame body 4, and a sealing member 5. At this time, in the case of an element that emits specific light, such as the light emitting element 3 emitting light in the ultraviolet region, the wavelength conversion member 6 may be provided.

The light emitting device 1 includes a substrate 2, a light emitting element 3 provided on the substrate 2, a frame body 4 provided on the substrate 2 so as to surround the light emitting element 3, and an inner space surrounded by the frame body 4. The sealing member 5 is filled with a part of the upper part of the space surrounded by the frame body 4, and the upper surface of the sealing member 5 is partly filled with the upper part of the inner space surrounded by the frame body 4. It is provided with a wavelength conversion member 6 provided so as to fit in the frame body 4 along the above. The light emitting element 3 is, for example, an LED, and emits light to the outside by recombination of electrons and holes in a pn junction using a semiconductor.

The substrate 2 is an insulating substrate, and is made of, for example, a ceramic material such as alumina or mullite, or a glass ceramic material. Alternatively, it is composed of a composite material in which a plurality of these materials are mixed. Further, as the substrate 2, a polymer resin in which metal oxide fine particles capable of adjusting the thermal expansion of the substrate 2 are dispersed can be used.

At least on the main surface of the substrate 2 or inside the substrate 2, a wiring conductor that electrically conducts the inside and outside of the substrate 2 is provided. The wiring conductor is made of a conductive material such as tungsten, molybdenum, manganese or copper. When the substrate 2 is made of a ceramic material, for example, a metal paste obtained by adding an organic solvent to a powder such as tungsten is printed on a ceramic green sheet to be the substrate 2 in a predetermined pattern, and a plurality of ceramic green sheets are laminated. Then, it is obtained by firing. A plating layer made of, for example, nickel or gold is formed on the surface of the wiring conductor to prevent oxidation. Further, on the upper surface of the substrate 2, in order to efficiently reflect light above the substrate 2, a metal reflective layer such as aluminum, silver, gold, copper or platinum is provided at intervals from the wiring conductor and the plating layer. It may be formed.

The light emitting element 3 is mounted on the main surface of the substrate 2. The light emitting element 3 is electrically connected to the plating layer adhered to the surface of the wiring conductor formed on the main surface of the substrate 2 via, for example, a brazing material or solder. The light emitting element 3 has a translucent substrate and an optical semiconductor layer formed on the translucent substrate. The translucent substrate may be one capable of growing an optical semiconductor layer by using a chemical vapor phase growth method such as an organic metal vapor phase growth method or a molecular beam epitaxial growth method. As the material used for the translucent substrate, for example, sapphire, gallium nitride, aluminum nitride, zinc oxide, zinc selenide, silicon carbide, silicon, zirconium dibodium or the like can be used. The thickness of the translucent substrate is, for example, 50 μm or more and 1000 μm or less.

The optical semiconductor layer is composed of a first semiconductor layer formed on a translucent substrate, a light emitting layer formed on the first semiconductor layer, and a second semiconductor layer formed on the light emitting layer. .. First semiconductor layer,
As the light emitting layer and the second semiconductor layer, for example, a group III nitride semiconductor, a group III-V semiconductor such as gallium phosphorus or gallium arsenide, or a group III nitride semiconductor such as gallium nitride, aluminum nitride or indium nitride is used. be able to. The thickness of the first semiconductor layer is, for example, 1 μm or more and 5 μm or less, the thickness of the light emitting layer is, for example, 25 nm or more and 150 nm or less, and the thickness of the second semiconductor layer is, for example, 50 nm or more and 600 nm or less. Further, the light emitting element 3 configured in this way can emit excitation light in a wavelength range of, for example, 280 nm or more and 450 nm or less.

The frame 4 is mixed with, for example, a ceramic material such as aluminum oxide, titanium oxide, zirconium oxide or yttrium oxide, or a porous material, or a powder made of a metal oxide such as aluminum oxide, titanium oxide, zirconium oxide or yttrium oxide. It consists of a made resin material. The frame body 4 is connected to the main surface of the substrate 2 via, for example, resin, brazing material, solder, or the like. The frame 4 is provided on the main surface of the substrate 2 so as to surround the light emitting element 3 at a distance from the light emitting element 3. Further, the frame body 4 is formed so that the inclined inner wall surface expands outward as the distance from the main surface of the substrate 2 increases. Then, the inner wall surface of the frame body 4 functions as a reflecting surface of the excitation light emitted from the light emitting element 3. In a plan view, if the shape of the inner wall surface of the frame body 4 is circular, the light emitted by the light emitting element 3 can be uniformly reflected outward by the reflecting surface.

Further, the inclined inner wall surface of the frame body 4 is made of, for example, a metal layer made of tungsten, molybdenum, manganese or the like on the inner peripheral surface of the frame body 4 made of a sintered material, and nickel or gold or the like covering the metal layer. A plating layer may be formed. This plating layer has a function of reflecting the light emitted by the light emitting element 3. The inclination angle of the inner wall surface of the frame body 4 is set to, for example, an angle of 55 degrees or more and 70 degrees or less with respect to the main surface of the substrate 2.

The inner space surrounded by the substrate 2 and the frame 4 is filled with a light-transmitting sealing member 5. The sealing member 5 seals the light emitting element 3 and takes out the light emitted from the inside of the light emitting element 3 to the outside. Further, it has a function of transmitting light taken out to the outside of the light emitting element 3. The sealing member 5 is filled in the inner space surrounded by the substrate 2 and the frame body 4, leaving a part of the space surrounded by the frame body 4. For the sealing member 5, for example, a translucent insulating resin such as a silicone resin, an acrylic resin or an epoxy resin, or a translucent glass material is used. The refractive index of the sealing member 5 is set to, for example, 1.4 or more and 1.6 or less.

The wavelength conversion member 6 is provided along the upper surface of the sealing member 5 in the upper part of the inner space surrounded by the substrate 2 and the frame body 4. The wavelength conversion member 6 is formed so as to fit inside the frame body 4. The wavelength conversion member 6 has a function of converting the wavelength of the light emitted by the light emitting element 3. That is, in the wavelength conversion member 6, the light emitted from the light emitting element 3 is incident inside through the sealing member 5, and the phosphor contained therein is excited by the light emitted from the light emitting element 3 to fluoresce. It emits fluorescence from the body and transmits and radiates a part of the light from the light emitting element 3. The wavelength conversion member 6 is made of, for example, a translucent insulating resin such as a fluororesin, a silicone resin, an acrylic resin or an epoxy resin, or a translucent glass material, and a phosphor is contained in the insulating resin or the glass material. It is contained. The phosphor is uniformly dispersed in the wavelength conversion member 6. The phosphor contained in the light emitting element 3 and the wavelength conversion member 6 is selected so that the light emission spectrum of the light emitted from the light emitting device 1 becomes the finally obtained light emission spectrum.

The wavelength conversion member 6 may contain a phosphor. For example, each fluorescent substance showing blue color is BaMgAl ₁₀ O ₁₇ : Eu, (Sr, Ca, Ba) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu, (Sr, Ba) ₁₀ (PO ₄ ) ₆ Cl. ₂ : The phosphor which is Eu and shows a bluish green color is (Sr, Ba, Ca) ₅ (PO ₄ ) ₃ Cl: Eu, Sr ₄ Al ₁₄ O ₂₅ : Eu. The fluorescent substances showing green color are SrSi ₂ (O, Cl) ₂ N ₂ : Eu, (Sr, Ba, Mg) ₂ SiO ₄ : Eu ²⁺ , ZnS: Cu, Al, Zn ₂ SiO ₄ : Mn. Examples of the fluorescent substance showing red color are Y ₂ O ₂ S: Eu, Y ₂ O ₃ : Eu, SrCaClAlSiN ₃ : Eu ²⁺ , CaAlSiN ₃ : Eu, CaAlSi (ON) ₃ : Eu. The fluorophore showing the near infrared region is 3Ga ₅ O ₁₂ : Cr.

Further, the light emitting element 3 may emit light in the ultraviolet region, or may emit blue, red, or green light. Further, a plurality of light emitting elements 3 may be housed in one light emitting device 1 by combining these.

The present invention is not limited to the example of the above-described embodiment, and various modifications such as numerical values are possible. The various combinations of feature portions in this embodiment are not limited to the examples of the above-described embodiments.

1 Light emitting device 10 Lighting device 11 Housing 12 Wiring board 13 Diffusion cover 14 Reflector plate 15 Bottom surface 16 Side surface (inclined surface)
17 Tip 18 Protrusion 19 Through hole 20 Inclined part 2 Board 21 Main body 21a Bottom 21b Support 22 Lid 3 Light emitting element 4 Frame 5 Sealing member 6 Wavelength conversion member

Claims (9)

Multiple light emitting devices, each with a light emitting element mounted on it,
A housing on which the plurality of light emitting devices are mounted, and
It is located in the housing and has a bottom surface and a side surface continuously located with the bottom surface, and the side surface reflects light emitted outward from the plurality of light emitting devices, and the plurality of light emission is performed. A reflector having an inclined plane whose tip extends outward from the plurality of light emitting devices above the device is provided.
The housing has a protrusion for fixing the tip of the inclined plane .
The protrusion has a bent portion that protrudes inward of the housing and bends toward the bottom surface.
The tip portion is a lighting device located inside the bent portion . The lighting device according to claim 1 , wherein the tip portion is separated from the bent portion . The bent portion has an inclined portion facing the tip portion, and the bent portion has an inclined portion.
The lighting device according to claim 1, wherein the tip portion is separated from the inclined portion toward the tip portion . The reflector has a through hole in the bottom surface and has a through hole.
The lighting device according to any one of claims 1 to 3, wherein the plurality of light emitting devices are located so as to overlap with the through hole. It has a wiring board located between the housing and the plurality of light emitting devices.
The lighting device according to any one of claims 1 to 4 , wherein the plurality of light emitting devices are mounted on the upper surface of the wiring board, and the wiring board is mounted on the housing. .. The lighting device according to any one of claims 1 to 5 , wherein the reflector has elasticity. The lighting device according to any one of claims 1 to 6 , further comprising a diffusion cover located on the upper surface of the housing. The lighting device according to any one of claims 1 to 7 , wherein the material of the reflector is polyethylene terephthalate. The lighting device according to claim 7 , wherein the distance from the upper surface of the light emitting device to the diffusion cover is 1 times or more and 4 times or less the distance between the plurality of light emitting devices.

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