JP2013008488A - Lighting fixture - Google Patents

Abstract

In a lighting fixture in which a solid light emitting element and a reflecting member are combined, the light use efficiency and the illuminance directly under the fixture are increased, and the luminance unevenness is reduced.
A lighting fixture includes a plurality of light sources arranged opposite to each other, a reflection member that reflects light emitted from the light source, a diffusion optical member that diffuses and distributes the light, and A housing 5 for housing each of the members. The reflecting member 3 is disposed at an intermediate position between the plurality of light sources 2 with the top portions 31 facing each other, and has an inclined surface having a predetermined inclination from the top portion 31 to each of the light sources 2. The diffusion optical member 4 is provided on the light irradiation direction side of the top portion 31. The light emitted from each of the opposing light sources 2 and directed toward the other light source 2 can be diffused by the diffusing optical member 4 at the center of the instrument and emitted in the direction directly below the instrument. And the luminance unevenness of the irradiated light is reduced.
[Selection] Figure 1

Description

  The present invention relates to a lighting fixture in which a solid light emitting element such as an LED (Light Emitting Diode) and a reflecting member are combined.

  Conventionally, there has been known an illuminating device in which an LED capable of emitting light with high power and high luminance and a reflecting member are combined (see, for example, Patent Documents 1 and 2). As shown in FIG. 5, such a lighting fixture includes a plurality of LEDs 10 facing each other, and a reflection member 20 having a top portion arranged at an intermediate position between the LEDs 10 and having a predetermined inclination with respect to each LED 10 from the top portion. And a light diffusing plate 30 disposed on the light irradiation surface. Most of the light emitted from the LED 10 (the optical path is indicated by a two-dot chain arrow) is reflected by the reflecting member 20 toward the light irradiation surface, diffused by the light diffusion plate 30, and then irradiated to the outside of the lighting fixture. .

JP 2008-218114 A JP 2010-40296 A

  However, in the luminaire as described above, a part of the light emitted from the LED 10 (the optical path is indicated by a dotted arrow) passes between the reflecting member 20 and the light diffusion plate 30 and travels toward the facing LED 10. . Since such light is not emitted from the luminaire, the light utilization efficiency of the luminaire decreases. Moreover, since there is little light reflected by the reflection member 20 in the center area | region of a lighting fixture, the illumination intensity directly under a fixture falls and it is easy to generate | occur | produce luminance unevenness.

  The present invention solves the above-mentioned problem, and in a lighting fixture that combines a solid light emitting element and a reflecting member, the lighting fixture capable of increasing the light utilization efficiency and the illuminance directly under the fixture, and reducing the luminance unevenness. The purpose is to provide.

  The luminaire of the present invention includes a plurality of light sources arranged to face each other, a reflection member that reflects light emitted from the light source, a diffusion optical member that diffuses and distributes light, a light source, a reflection member, and diffusion optics A housing for housing the member, wherein the reflecting member has an apex arranged at an intermediate position between the plurality of light sources facing each other, and has a predetermined inclination with respect to the light source from the apex And the diffusion optical member is provided on the light irradiation direction side of the top position of the reflection member.

  The light source is preferably disposed at an end of the housing.

  The diffusion optical member is preferably provided along a direction orthogonal to the optical axis of the light source.

  It is preferable that the housing has a polygonal shape when viewed from the light irradiation surface side, and the diffusing optical member is provided on a side of the housing where the light source is not provided.

  The casing and the diffusing optical member are preferably circular when viewed from the light irradiation surface side.

  According to the present invention, light emitted from each facing light source and traveling in the direction of the other light source can be diffused by the diffusing optical member at the center of the instrument and emitted in the direction directly below the instrument. The illuminance directly below increases, and the uneven brightness of the irradiated light is reduced.

(A) is sectional drawing of the lighting fixture which concerns on embodiment of this invention, (b) is the figure which looked at the lighting fixture from the light irradiation surface side. (A) thru | or (c) is a figure which shows the modification of the diffusion optical member which comprises the said lighting fixture. (A) is the figure which looked at the lighting fixture which concerns on the 1st modification of the said embodiment from the light irradiation surface side, (b) is the figure which looked at the lighting fixture from the I direction of (a). (A) is the figure which looked at the lighting fixture which concerns on the 2nd modification of the said embodiment from the light irradiation surface side, (b) is the II-II sectional view taken on the line of (a). Sectional drawing of the conventional lighting fixture.

  The lighting fixture which concerns on embodiment of this invention is demonstrated with reference to FIG. 1, FIG. As shown in FIGS. 1A and 1B, a luminaire 1 includes a plurality of light sources 2 facing each other, a reflecting member 3 that reflects light from the light sources 2, and diffusion optics that diffuses and distributes the light. A member 4, a housing 5 that accommodates each of the members, and a light diffusion plate 6 that diffuses the light are provided. In the present embodiment, the housing 5 has a quadrangular shape as viewed from the light irradiation surface side, and the light sources 2 are respectively disposed at ends corresponding to two sides of the housing 5 facing each other. The reflecting member 3 is disposed at an intermediate position of the light source 2 facing the top 31, and has an inclined surface having a predetermined inclination with respect to the light source 2 from the top 31. The diffusing optical member 4 has a long cylindrical shape, and is provided on the light irradiation direction side of the top portion 31 of the reflecting member 3 along a direction orthogonal to the optical axis of the light source 2. The light diffusion plate 6 is attached to the light irradiation surface of the housing 5.

  Each of the light sources 2 includes a plurality of LEDs 21 that are arranged in cascade at equal intervals, and a wiring board 22 on which the LEDs 21 are mounted. LED21 is comprised from white LED which emits white light, for example. The wiring board 22 is configured using a material having high thermal conductivity, for example, a metal such as aluminum, a resin such as glass epoxy, or an inorganic material such as ceramic as a base material. The wiring board 22 has a wiring pattern for supplying power to the LEDs 21. This wiring pattern is connected to a dimming device including a switch, a microcomputer, and the like via a distribution line, and the LED 21 is turned on / off and dimmed by adjusting power supply from the commercial power source to the LED 21. . The number of LEDs 21 mounted on the wiring board 22 and the arrangement of the LEDs 21 on the wiring board 22 are not limited to those shown in the drawing.

  The reflecting member 3 is made of a material having a high visible light reflectance. In addition, the shape and arrangement | positioning of the reflection member 3 are not limited to the thing of this embodiment.

  The diffusing optical member 4 is made of, for example, a translucent material in which particulate matter or bubbles are dispersed, or a translucent material having irregularities formed on the surface by frosting or the like. The particulate matter is made of, for example, silicon dioxide or ceramic, and the translucent material is made of, for example, transparent glass or transparent acrylic resin. The diffusing optical member 4 preferably has a linear transmittance of 50% or less. Note that the diffusing optical member 4 is not limited to a cylindrical shape, and may be, for example, a triangular prism shape, a quadrangular prism shape, or a hexagonal prism shape as illustrated in FIGS. When the diffusing optical member 4 has a triangular prism shape, the diffusing optical member 4 is disposed, for example, in a state where the top portion is joined to the top portion 31 of the reflecting member 3. Further, when the diffusing optical member 4 has a quadrangular prism shape or a hexagonal prism shape, the diffusing optical member 4 is disposed, for example, in a state where the longitudinal side surface thereof is bonded to the top portion 31.

  The housing 5 is made of a material having high rigidity and high thermal conductivity, for example, a metal such as aluminum or a resin such as glass epoxy. The housing 5 has a holding structure for attaching the lighting fixture 1 to a ceiling, a wall or the like on the surface opposite to the light irradiation surface.

  The light diffusing plate 6 is made of the same material as the diffusing optical member 4 described above. When the light diffusing plate 6 is made of a material having a relatively high hardness, the light diffusing plate 6 also functions as an outer shell member that protects the lighting fixture 1 from an impact or the like.

  The operation and effect of the lighting fixture 1 configured as described above will be described with reference to FIG. The luminaire 1 diffuses light (light path is indicated by a dotted arrow) emitted from each of the opposed light sources 2 toward the other light source 2 in various directions by the diffusing optical member 4 at the center of the fixture. The light is emitted directly below. At this time, a part of the light diffused by the diffusing optical member 4 can return to the inner direction of the lighting fixture 1, but such return light is reflected by the reflecting member 3 and again to the outer direction of the lighting fixture 1. Head. As a result, the light utilization efficiency and the illuminance directly under the appliance are increased, and the luminance unevenness of the irradiated light is reduced.

  Next, the lighting fixture which concerns on the 1st modification of this embodiment is demonstrated with reference to Fig.3 (a) (b). Below, the point different from the above-mentioned lighting fixture 1 is demonstrated. The luminaire 11 includes a diffusing optical member 4 that is disposed over the side of the housing 5 where the light source 2 is not provided and includes the position of the top 31 of the reflecting member 3. Thereby, the light emitted from the light source 2 toward the end portion of the luminaire 11 (the optical path is indicated by a dotted arrow in FIG. 3B) is diffused by the diffusing optical member 4 and emitted from the luminaire 11. it can. Therefore, the illuminance at the end where the light source 2 is not provided is increased, and the luminance unevenness is reduced. In addition, the lighting fixture 11 may be configured to include the diffusing optical member 4 provided in the central portion of the fixture shown in the above embodiment.

  Next, the lighting fixture which concerns on the 2nd modification of this embodiment is demonstrated with reference to Fig.4 (a) (b). The luminaire 12 includes a plurality of light sources 2 provided on the inner periphery of a circular housing 5 as viewed from the light irradiation surface side, and a diffusing optical member 4 provided at the center position of the housing 5. The diffusing optical member 4 has a cylindrical shape, and is disposed in a state where the peripheral surface thereof faces each light source 2. According to the lighting fixture 12 of this modification, since the diffusing optical member 4 is circular when viewed from the light irradiation surface side, the light from the light source 2 is diffused with less directivity than the lighting fixture 1. Can be irradiated. The arrangement of the light sources 2 is not limited to that shown in the figure. For example, the wiring board 22 is formed of a flexible printed circuit board (FPC) having flexibility, and each light source 2 is arranged along the inner periphery of the housing 5. You may arrange.

  Further, in the present embodiment and any of the modifications, the wiring board 22 and the housing 5 are made of a material having high thermal conductivity, so that the heat generated with the light emission of the LED 21 is efficiently radiated to the outside. Thus, the life of the LED 21 can be extended.

  In addition, the lighting fixture which concerns on this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, the light source is not limited to a white LED, and may be composed of an LED of another color, or may be composed of a light source such as an organic EL. Further, the light source is not necessarily arranged at the end of the casing, and may be arranged inside the casing. Furthermore, the housing is not limited to a rectangular column shape or a cylindrical shape, and may be a hexagonal column shape or an elliptical column shape, for example.

DESCRIPTION OF SYMBOLS 1, 11, 12 Lighting fixture 2 Light source 3 Reflective member 31 Top part of reflective member 4 Diffusing optical member 5 Case

Claims (5)

A plurality of light sources arranged opposite to each other, a reflection member that reflects light emitted from the light source, a diffusion optical member that diffuses and distributes light, and a housing that houses the light source, the reflection member, and the diffusion optical member In a lighting fixture comprising
The reflecting member has an inclined surface with a top portion arranged at an intermediate position between the plurality of light sources facing each other and having a predetermined inclination from the top portion to the light source,
The diffusing optical member is provided on the light irradiation direction side of the top position of the reflecting member.   The lighting apparatus according to claim 1, wherein the light source is disposed at an end of the housing.   The lighting device according to claim 1, wherein the diffusing optical member is provided along a direction orthogonal to the optical axis of the light source.   The said housing | casing is made into polygonal shape seeing from the light irradiation surface side, The said diffusion optical member is provided in the edge | side of this housing | casing in which the said light source is not provided. Item 3. A lighting apparatus according to item 2.   The lighting apparatus according to claim 1, wherein the casing and the diffusing optical member have a circular shape when viewed from the light irradiation surface side.

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