JP2012227005A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of reducing glare and color unevenness by mixing light emitted from a plurality of light sources while restraining light loss.SOLUTION: In the lighting device, a base board 141 having an approximately circular opening at an approximate center is of a plate shape. The plurality of light sources 142 are mounted on one of the surfaces of the base board 141, and are arranged at a location surrounding the opening. A lens 170 has an approximately torus shape, and refracts light emitted from the plurality of light sources 142. A bottom face section 181 of a reflection section 180 is arranged in opposition to the base board 141, and reflects the light refracted with the lens 170 to emit it outside through the opening of the base board 141.

Description

  The present invention relates to a lighting device.

  There is an illuminating device that does not directly radiate light emitted from a light source but radiates diffusely reflected light by reflecting it on a diffuse reflection surface or the like.

JP 2010-170868 A

When the lighting device includes a plurality of light sources, the light emitted from each light source may be seen separately, and glare and color unevenness may occur.
By reflecting the light emitted from the light source on the diffuse reflection surface or the like, glare and color unevenness can be suppressed to some extent, but light loss occurs.
The present invention has been made to solve the above-described problems, for example, and reduces glare and color unevenness by mixing light emitted from a plurality of light sources while suppressing light loss. Objective.

  An illumination device according to the present invention includes a plate-like substrate having a substantially circular opening at a substantially center, a plurality of light sources mounted on one surface of the substrate and arranged at a position surrounding the opening, and a substantially torus shape And a lens that refracts the light emitted from the plurality of light sources, and a reflection part that is disposed to face the substrate and reflects the light refracted by the lens and emits the light from the opening of the substrate. It is characterized by that.

  According to the illumination device of the present invention, it is possible to mix light emitted from a plurality of light sources while suppressing loss of light, so that glare can be reduced, and graininess and color unevenness of the light sources are reduced. be able to.

FIGS. 3A and 3B are a front view, a cross-sectional view, and a partially enlarged cross-sectional view illustrating the lighting device 100 according to Embodiment 1. FIGS. FIG. 2 is a plan view and a cross-sectional view illustrating a lens 170 in the first embodiment. FIG. 3 is a plan view showing light source module 140 in the first embodiment. FIG. 3 is a plan view showing a cover 160 in the first embodiment. FIG. 3 shows a path of light emitted from a light source 142 in Embodiment 1. 6 is a diagram showing an illuminance distribution on the bottom surface portion 181 irradiated with light emitted from one of the light sources 142 in Embodiment 1. FIG. FIG. 6 shows an illuminance distribution on a bottom surface portion 181 irradiated with light emitted from a plurality of light sources 142 of the same type in the first embodiment. Sectional drawing which shows the illuminating device 100 in Embodiment 2. FIG. FIG. 10 is a diagram showing an illuminance distribution on the reflection unit 180 irradiated with light emitted from one of the light sources 142 in the second embodiment. The figure which shows the illumination intensity distribution on the reflection part 180 irradiated with the light which the same kind of several light source 142 in Embodiment 2 emitted. FIG. 6 is a bottom view and a cross-sectional view illustrating a lighting device 100 according to Embodiment 3. 6 is a bottom view and a cross-sectional view illustrating a lighting device 100 according to Embodiment 4. FIG.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS.

FIG. 1 is a front view, a cross-sectional view, and a partially enlarged cross-sectional view showing a lighting device 100 according to this embodiment.
The lighting device 100 is, for example, a lighting fixture (a so-called downlight type) that is used by being embedded in an indoor ceiling surface or the like. The lighting device 100 includes, for example, a main body 150, a frame 110, a heat radiation fin 130, a power supply device 120, a light source module 140, a cover 160, and a lens 170.
The main body 150 (luminaire main body) is substantially cylindrical. The main body 150 is a portion embedded in the ceiling surface. The main body 150 contains the light source module 140 and the like.
The frame 110 has a substantially disk shape. The frame 110 is a portion exposed to the room from the ceiling surface. The frame 110 is provided at a position where it hits the lower bottom surface of the main body 150. The radius of the frame 110 is larger than the radius of the main body 150. The frame 110 has an opening 111 at substantially the center. The opening 111 is substantially circular. The opening 111 is a portion from which light emitted from the lighting device 100 is emitted.
The radiating fins 130 are provided integrally with the main body 150 on the upper bottom surface of the main body 150. The radiation fins 130 radiate heat generated by the light source module 140 and the like to the outside. The heat radiating fins 130 are made of a material having high thermal conductivity such as aluminum.
The power supply device 120 is mounted on the upper side of the main body 150 at a position surrounded by the radiation fins 130. The power supply device 120 converts power (for example, AC power) supplied from a commercial power source or the like into power (for example, DC power) for lighting the light source 142. The power supply device 120 supplies the converted power to the light source module 140.
The light source module 140 (disc-shaped LED module) is located on the back side of the frame 110. The light source module 140 includes a substrate 141 and a light source 142. The substrate 141 is, for example, a printed wiring board. The light source 142 is an LED package, for example. The light source 142 is fixed to the substrate 141 by soldering or the like. In the light source module 140, a light source circuit for supplying power supplied from the power supply device 120 to the light source 142 is formed by printed wiring provided on the substrate 141.
The cover 160 covers the light source module 140 and prevents contact with the energized portion. The cover 160 supports and positions the lens 170. The cover 160 has a recess 161 and a hole 162. The recess 161 has a shape that engages with the lens 170, and the hole 162 is provided at a position corresponding to the light source 142 so that light emitted from the light source 142 enters the lens 170.
The lens 170 (doughnut type ring) is substantially annular, and has, for example, a substantially torus shape (doughnut shape). The lens 170 is made of a material that transmits visible light and has a refractive index of 1 or more, such as acrylic or glass. The lens 170 refracts and transmits light. The lens 170 refracts the light emitted from the light source 142 and collects the light toward the substantially central direction of the bottom surface portion 181 of the reflection unit 180.
The inner surface of the main body 150 forms a reflection portion 180. The reflector 180 (cylindrical reflector) diffuses and reflects light. The reflection unit 180 reflects the light refracted by the lens 170 and radiates the light from the opening 111 to the outside of the illumination device 100. The reflection unit 180 includes, for example, a bottom surface 181 and a side surface 182. The bottom surface portion 181 hits the inside of the upper bottom surface of the main body 150 and has a substantially circular shape. The bottom surface portion 181 is substantially parallel to the frame 110. The side surface part 182 hits the inside of the side surface of the main body 150 and is substantially perpendicular to the frame 110.

FIG. 2 is a plan view and a cross-sectional view showing the lens 170 in this embodiment.
The lens 170 is, for example, a rotating body that rotates a circle having a radius 273 centered on a position away from the central axis 271 by a radius 272 around the central axis 271. The outer radius 274 of the lens 170 is the sum of the radius 272 and the radius 273. The inner radius 275 of the lens 170 is a difference obtained by subtracting the radius 273 from the radius 272. The inner radius 275 is slightly larger than the radius of the opening 111 of the frame 110.

FIG. 3 is a plan view showing the light source module 140 in this embodiment.
The substrate 141 has a substantially disk shape. The substrate 141 has an opening 143 substantially at the center. The opening 143 is substantially circular and is slightly larger than the opening 111 of the frame 110.
The light source module 140 has a plurality of light sources 142. The plurality of light sources 142 are arranged at substantially equal intervals in a substantially circular shape that surrounds the opening 143 of the substrate 141. A radius 241 of a circle connecting the center points of the light source 142 is smaller than the outer radius 274 of the lens 170 and larger than the radius 272.
There are two types of light sources 142: a light source 142a and a light source 142b. The two types of light sources 142a and 142b are alternately arranged.
For example, the light source 142a and the light source 142b are different in main wavelength, chromaticity coordinates, correlated color temperature, and the like. The lighting device 100 emits light obtained by mixing light emitted from two types of light sources 142a and 142b. Thereby, the illuminating device 100 radiates | emits the light which has chromaticity coordinates and correlation color temperature of the middle of the light which two types of light sources 142a and 142b emit. The intensity of light emitted from each of the two types of light sources 142a and 142b may be a predetermined constant intensity or a variable intensity. For example, the lighting device 100 receives a color temperature signal indicating a correlated color temperature, and determines the power supplied to each of the two types of light sources 142a and 142b according to the input color temperature signal, thereby providing two types of light sources. The intensity of light emitted by 142a and 142b is changed. Thereby, the correlation color temperature of the light which the illuminating device 100 radiates changes.

FIG. 4 is a plan view showing the cover 160 in this embodiment.
The cover 160 has a substantially disk shape that is slightly larger than the light source module 140. The cover 160 has an opening 163 substantially at the center. The opening 163 is substantially circular and is slightly smaller than the opening 143 of the light source module 140. The recess 161 has a circular shape in accordance with the shape of the lens 170. The same number of holes 162 as the number of the light sources 142 of the light source module 140 are provided at positions corresponding to the positions of the light sources 142.

FIG. 5 is a diagram showing a path of light emitted from the light source 142 in this embodiment.
The light emitted from the light source 142 is refracted through the lens 170, travels toward the center of the bottom surface portion 181 of the reflection portion 180, strikes the bottom surface portion 181, and is diffusely reflected. Thereby, the light emitted from the two types of light sources 142a and 142b is mixed. A part of the light diffused and reflected by hitting the bottom surface 181 is directly emitted from the opening 111 to the outside of the lighting device 100, and another part of the light hits the side surface 182 and rediffuses. Radiated to the outside.

FIG. 6 is a diagram showing an illuminance distribution on the bottom surface portion 181 irradiated with light emitted from one of the light sources 142 in this embodiment.
In addition, it shows that it is so bright that the density of an oblique line is dark.
The light emitted from one light source 142 passes through the lens 170 and is refracted to irradiate the vicinity of the center of the bottom surface portion 181. In particular, the portion that hits the opening 111 is irradiated most brightly.

FIG. 7 is a diagram showing an illuminance distribution on the bottom surface portion 181 irradiated with light emitted from a plurality of light sources 142 of the same type in this embodiment.
In this figure, the left figure shows the illuminance distribution by the light emitted from the light source 142a. The diagram on the right side shows the illuminance distribution due to the light emitted from the light source 142b.
The light emitted from each type of light source 142a, 142b is concentrated near the center of the bottom surface portion 181, and the portion that hits the opening 111 is irradiated brightest. Since each type of light irradiates most brightly in the same range, the two types of light can be mixed without color unevenness.

As described above, the light collected by the lens 170 near the center of the bottom surface portion 181 is diffusely reflected by the reflecting portion 180, so that the light emitted from the plurality of light sources 142 can be mixed while suppressing the loss of light. .
Note that the type of the light source 142 may be one type or three or more types.
When the type of the light source 142 is one, glare can be reduced by mixing the light emitted from the plurality of light sources 142, and for example, the graininess of the LED light source can be eliminated.
In addition, when there are a plurality of types of light sources 142, glare can be reduced and color unevenness can be reduced by mixing light emitted from the plurality of light sources 142.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIGS.
In addition, about the part which is common in Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 8 is a cross-sectional view showing lighting device 100 in this embodiment.
The illumination device 100 is different from the first embodiment in the shape of the reflection unit 180.
The reflector 180 (dome-shaped reflector) has a dome shape (saddle shape) in which the central portion is farther from the light source module 140 than the peripheral portion, such as a paraboloid shape or a spherical shape.

FIG. 9 is a diagram showing an illuminance distribution on the reflector 180 irradiated with light emitted from one of the light sources 142 in this embodiment.
Since the reflecting portion 180 has a dome shape, the light emitted from one light source 142 irradiates a narrower range than in the first embodiment. In particular, since the light emitted in the direction far from the center of the reflection unit 180 hits the dome-shaped side surface of the reflection unit 180, the light is irradiated at a position closer to the center of the reflection unit 180 than in the first embodiment.

FIG. 10 is a diagram showing an illuminance distribution on the reflection unit 180 irradiated with light emitted from a plurality of light sources 142 of the same type in this embodiment.
In this figure, the left figure shows the illuminance distribution by the light emitted from the light source 142a. The diagram on the right side shows the illuminance distribution due to the light emitted from the light source 142b.
The light emitted from each type of light source 142a, 142b is concentrated near the center of the bottom surface portion 181, and the portion that hits the opening 111 is irradiated brightest. Since each type of light irradiates most brightly in the same range, the two types of light can be mixed without color unevenness.

Embodiment 3 FIG.
The third embodiment will be described with reference to FIG.
Note that portions common to Embodiment 1 or Embodiment 2 are denoted by the same reference numerals and description thereof is omitted.

FIG. 11 is a bottom view and a cross-sectional view showing the lighting device 100 according to this embodiment.
The lighting device 100 further includes a diffusion plate 190 in addition to the configuration described in the first embodiment.

  The diffusion plate 190 (diffusion transmission part) is substantially disk-shaped. The diffusion plate 190 diffuses and transmits light. The diffusion plate 190 is fitted in the opening 111 of the frame 110. The diffusing plate 190 strikes the reflecting portion 180 and is diffusely reflected, and diffuses the light that passes through the opening 111 and goes out of the lighting device 100.

  Thus, by providing the diffuser plate 190 in the opening 111, the color unevenness of the light emitted from the lighting device 100 can be further reduced, and the glare can be reduced.

  Note that the shape of the reflecting portion 180 may be the shape described in the second embodiment.

Embodiment 4 FIG.
The fourth embodiment will be described with reference to FIG.
In addition, about the part which is common in Embodiment 1- Embodiment 3, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 12 is a bottom view and a cross-sectional view showing the lighting apparatus 100 according to this embodiment.
The lighting device 100 does not have the frame 110 described in the first embodiment, and is a lighting fixture (a so-called small ceiling type) that is used by being entirely embedded in a ceiling surface or the like.
The heat radiating fins 130 are provided not on the upper side of the main body 150 but on the lower side of the main body 150 at the position of the frame 110 described in the first embodiment. The heat radiating fin 130 has a screw hole 131 and a cylindrical portion 132. The screw hole 131 is screwed with a screw that fixes the lighting device 100 to the ceiling surface. The cylindrical part 132 corresponds to the opening part 111 of the frame 110, and radiates the light diffused and reflected by the reflection part 180 to the outside of the lighting device 100.

  Thus, by providing the radiation fin 130 on the lower side of the main body 150, the heat generated in the light source module 140 is easily transmitted to the radiation fin 130. For this reason, the heat dissipation efficiency of the heat generated in the light source module 140 is increased.

  Note that the shape of the reflecting portion 180 may be the shape described in the second embodiment.

  As described above, the configuration described in each embodiment is an example, and another configuration may be used. For example, the structure which combined the structure demonstrated in different embodiment may be sufficient, and the structure which replaced the structure of the non-essential part with the other structure may be sufficient. For example, the lighting device 100 may be a lighting fixture (so-called pendant type) that is used by being hung from a ceiling surface or the like.

  DESCRIPTION OF SYMBOLS 100 Illumination device, 110 Frame, 111 opening part, 120 Power supply device, 130 Radiation fin, 131 Screw hole, 132 Cylindrical part, 140 Light source module, 141 Substrate, 142 Light source, 143, 163 Opening, 150 Main body, 160 Cover, 161 Recess 162 hole portion, 170 lens, 180 reflecting portion, 181 bottom surface portion, 182 side surface portion, 190 diffuser plate, 241, 272, 273 radius, 271 central axis, 274 outer radius, 275 inner radius.

Claims (5)

A plate-like substrate having a substantially circular opening at a substantially center;
A plurality of light sources mounted on one surface of the substrate and disposed at a position surrounding the opening;
A substantially annular lens that refracts light emitted from the plurality of light sources;
An illuminating device, comprising: a reflecting portion that is disposed to face the substrate and reflects the light refracted by the lens and radiates the light to the outside from the opening of the substrate.   The lighting device according to claim 1, wherein the lens emits refracted light toward a substantially central direction of the reflecting portion.   The lighting device according to claim 1, wherein the reflecting portion has a bowl shape whose center is separated from the substrate.   4. The light source according to claim 1, wherein the plurality of light sources include a plurality of types of light sources in which at least one of a main wavelength, chromaticity coordinates, and correlated color temperature of emitted light is different. Lighting device.   The illumination device according to claim 4, wherein the plurality of light sources have different types of light sources arranged alternately.

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