JP5853128B2 - lighting equipment - Google Patents

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 reflector are combined.

  2. Description of the Related Art Conventionally, there has been known a lighting fixture in which an LED capable of emitting light with high power and high luminance and a reflector are combined (for example, see Patent Documents 1 and 2). Examples of this type of lighting fixture are shown in FIGS. This lighting fixture includes a plurality of LEDs 10, a reflecting plate 20 that reflects light from the LEDs 10 (an optical path is indicated by a one-dot chain arrow), a housing 30 that has an opening on the front side and accommodates the LEDs 10 and the reflecting plate 20. And a diffusion plate 40 that is attached to the opening side of the housing 30 and diffuses and transmits light. The light reflected by the reflecting plate 20 is diffused in various directions by the diffusing plate 40 and then irradiated to the living space or the like from the front side.

  This lighting fixture further includes a plurality of LEDs 50 as auxiliary light sources on the back side. The light from these LEDs 50 is irradiated to the back side through the light transmitting portion 31 provided on the side surface near the back surface of the housing 30.

JP 2010-40296 A JP 2008-218114 A

  However, in the lighting fixture as described above, since only the sub-light source is used to distribute light to the back side, many sub-light sources are required to distribute a sufficient amount of light to the back side. Manufacturing cost increases. Moreover, since the light irradiated from the front side tends to concentrate on the vicinity of LED10, the center part of an instrument becomes comparatively dark and it is easy to produce uneven brightness in irradiated light.

  The present invention solves the above-described problem, and in a lighting fixture that combines a solid light emitting element and a reflector, the auxiliary light source is not provided, or even if there are fewer auxiliary light sources than the conventional fixture, the rear side is sufficient. It aims at providing the lighting fixture which can distribute the quantity of light. Another object of the present invention is to provide a luminaire that can reduce uneven brightness of light emitted from the front side.

The luminaire of the present invention includes a plurality of light sources, a reflecting plate that reflects light from these light sources and controls light distribution, a housing that has an opening on the front side and accommodates the light source and the reflecting plate, and the housing. And a diffusion plate that diffuses and transmits light from the light source, and the plurality of light sources have LEDs as light emitters, and the opening with the optical axis directed toward the center of the casing. The reflective plate is disposed on the light source side with respect to the front reflective surface, and reflects the light from the light source on the back side. A reflective surface for the back surface that reflects the light, and the housing has a translucent portion on a side surface near the back surface, and the light reflected by the reflective surface for the back surface passes through the translucent portion and It is characterized by being irradiated to the side.

  The reflector is symmetrical with respect to the center of the casing and has a top portion that protrudes most toward the front side, and the front reflective surface is a recess recessed around the top portion and recessed toward the back side. Preferably, the back reflecting surface is formed from a concave curved surface that is located around the ridge line on the outer periphery of the front reflecting surface and rises from the front reflecting surface. .

  It is preferable that the housing has a rectangular shape when viewed from the front side, and the light sources are respectively disposed on four sides of the housing.

  The casing is rectangular when viewed from the front side, and the light source is disposed on each of two sides facing each other across the opening of the casing, and is directed toward the back side near the back side of the other two sides. It is preferable that a secondary light source for irradiating light is provided.

  It is preferable that the sub light source is provided between the housing and the reflection plate, and the reflection plate has a hole through which a part of light from the sub light source is transmitted to the front side.

  According to the present invention, since a part of the light from the light source is also irradiated on the back side, a sufficient amount of light is not provided on the back side even if there is no auxiliary light source or there are fewer auxiliary light sources compared to conventional lighting fixtures. Can distribute light. Further, the front reflective surface is not disposed in the vicinity of the light source, and much light is irradiated to the back side by the back reflective surface in the vicinity of the light source. Therefore, compared with the conventional instrument, the light incident on the diffuser plate near the light source is reduced on the front side, and the difference in luminance of the irradiated light between the vicinity of the light source and the central part of the instrument is reduced, thereby reducing the luminance unevenness.

The figure which looked at the lighting fixture which concerns on embodiment of this invention from the front side. (A) is the II sectional view taken on the line of FIG. 1, (b) is the II-II sectional view taken on the line of FIG. The figure which looked at the lighting fixture which concerns on the 1st modification of the said embodiment from the front side. FIG. 4 is a cross-sectional view taken along the line II in FIG. 3. The figure which looked at the lighting fixture which concerns on the 2nd modification of the said embodiment from the front side. FIG. 6 is a cross-sectional view taken along the line I-I in FIG. 5. The figure which looked at the lighting fixture which concerns on the 3rd modification of the said embodiment from the front side. (A) is the II sectional view taken on the line of FIG. 7, (b) is the II-II sectional view taken on the line of FIG. (A) is the figure which looked at the conventional lighting fixture from the front side, (b) is the II sectional view taken on the line of (a), (c) is the II-II sectional view taken on the line of (a).

  The lighting fixture which concerns on embodiment of this invention is demonstrated with reference to FIG. 1, FIG. This luminaire irradiates the living space or the like from the front side and is attached to the ceiling, wall, or the like via the back side.

  The luminaire 1 includes a plurality of light sources 2, a reflecting plate 3 that reflects light from the light sources 2, a housing 4 that has an opening on the front side and accommodates the light source 2 and the reflecting plate 3, and an opening of the housing 4 A diffusion plate 5 that is mounted on the side and diffuses and transmits light from the light source 2 and a power supply circuit 6 that adjusts power supply to the light source 2 are provided. In the present embodiment, the housing 4 is rectangular when viewed from the front (plan view), and the rod-shaped light sources 2 are disposed on the inside of the housing 4 on two sides facing each other across the opening of the housing 4. Be placed. The reflecting plate 3 has a substantially triangular prism shape, and is disposed at an intermediate position between the light sources 2 facing each other with the longitudinal top 31 protruding most toward the front side. The reflection plate 3 includes a front reflection surface 32 that reflects light from the light source 2 to the front side, and a back reflection surface 33 that reflects the same light to the back side. The front reflective surface 32 is formed of a concave curved surface extending from the top portion 31 in the direction of each light source 2 and recessed toward the back side. The back reflecting surface 33 is connected to the front reflecting surface 32 and is disposed closer to the light source 2 than the front reflecting surface 32, and is formed of a concave curved surface rising from the front reflecting surface 32. The housing 4 has a translucent portion 41 that transmits light on the side surface near the back surface. The light reflected by the back reflecting surface 33 is irradiated to the back side through the light transmitting portion 41.

  Each light source 2 includes a plurality of LEDs 21 that are light emitters, a wiring board 22 on which the LEDs 21 are mounted, and a light collector 2 that condenses the light from the LEDs 21 so as to be efficiently incident on the reflector 3 by narrow-angle light distribution. And an optical lens 23. 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 LED 21, and this wiring pattern is connected to a power supply circuit 6 including a switch, a microcomputer, and the like via a distribution line. The power supply circuit 6 converts the home power supply into a current and voltage suitable for the LED 21, and controls the on / off control and dimming control of the LED 21 by adjusting the power supply from the home power supply to the LED 21. Each light source 2 is held by a housing 4 so that the mounting angle with respect to the reflector 3 can be adjusted. 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. Further, the arrangement of the light sources 2 in the housing 4 is not limited to that of the present embodiment. Further, each light source 2 may be constituted by one LED 21.

  The reflector 3 is made of a metal or resin as a base material, and has a surface that is white-coated or mirror-finished to have high visible light reflectivity. The mirror surface treatment is performed by, for example, aluminum vapor deposition or silver vapor deposition. It is preferable that the reflection diffusivity of the reflector 3 is adjusted according to the light from the light source 2.

  The housing 4 is made of a material having high thermal conductivity and high rigidity, for example, a metal such as aluminum or a resin such as glass epoxy. The translucent part 41 of the housing 4 is provided, for example, by disposing a diffusion member that diffuses and transmits light in a slit provided in the housing 4. The diffusing member is made of, for example, a light diffusing material, a light transmissive material in which bubbles are dispersed, or a light transmissive material having irregularities formed on the surface by frosting or the like. The light diffusing material is made of, for example, particles based on titanium oxide, calcium carbonate, or the like, and the light transmissive material is made of, for example, a transparent resin such as acrylic or polycarbonate, or transparent glass. Moreover, the housing | casing 4 has a holding structure for attaching the lighting fixture 1 to a ceiling, a wall, etc. on the outer surface of the back side.

  The diffusing plate 5 is made of a light-transmitting material similar to that of the above diffusing member, and preferably has a linear transmittance of 50% or less. When the diffusing plate 5 is made of a material having a relatively high hardness, the diffusing plate 5 also functions as an outer shell member that protects the lighting fixture 1 from an impact or the like.

  In the luminaire 1 configured as described above, a part of the light from the light source 2 (the optical path is indicated by a broken-line arrow in FIG. 2A) is reflected by the back reflecting surface 33 and then translucent. Irradiated to the back side through the portion 41. In addition, most of the light from the light source 2 is directly incident on the diffusion plate 5 or reflected by the front reflection surface 32 and then enters the diffusion plate 5 and is irradiated to the front side. At this time, since the front reflecting surface 32 is not disposed in the vicinity of the light source 2, only light incident directly on the diffusion plate 5 from the light source 2 is irradiated from the vicinity of the light source 2 on the front side.

  As described above, according to the luminaire 1 of the present embodiment, since a part of the light from the light source 2 is also irradiated on the back side, it is possible to distribute light to the back side without providing a secondary light source. . Moreover, since only the light directly incident on the diffusion plate 5 from the light source 2 is irradiated from the vicinity of the light source 2 on the front side, the light irradiated from the vicinity of the light source 2 is reduced as compared with the conventional lighting fixture. The difference in luminance of irradiated light between the vicinity of 2 and the central part of the instrument is reduced, and the luminance unevenness is reduced.

  In the present embodiment, the secondary light source is not provided. However, the present invention is not limited to this, and the secondary light source 2 of the rectangular casing 4 when viewed from the front side is provided on the two sides. A light source may be provided. The auxiliary light source is provided on the inner surface on the back side of the housing 4, for example. On the two sides of the housing 4 provided with the light source 2, the light from the light source 2 is irradiated to the back side by the back reflecting surface 33, and on the other two sides provided with the sub light source, the light from the sub light source is emitted. Light is irradiated to the back side. Therefore, since light can be irradiated to the back side without providing a sub-light source on the two sides where the light source 2 is provided, light can be distributed to the back side with fewer sub-light sources compared to conventional lighting fixtures. .

  Next, the lighting fixture which concerns on the 1st modification of this embodiment is demonstrated with reference to FIG. 3, FIG. In the luminaire 11, the rod-shaped light sources 2 are arranged on the four sides of the rectangular housing 4 when viewed from the front side, and the reflecting plate 3 having the inverted quadrangular pyramid shape projects the top portion 31 to the front side. It is arranged in the center of the housing 4 in a state where By adopting such a configuration, it is possible to reduce the luminance unevenness by emitting light on the four sides of the fixture with a more uniform illuminance than in the lighting fixture 1, and to irradiate light toward the four sides on the back side. Can do.

  Next, the lighting fixture which concerns on the 2nd modification of this embodiment is demonstrated with reference to FIG. 5, FIG. The lighting fixture 12 is point-symmetric with respect to the center of the casing 4, a circular casing 4 as viewed from the front side, a plurality of light sources 2 distributed in an annular shape on the inner peripheral surface of the casing 4, and the center of the casing 4. And a reflecting plate 3 that is formed in an inverted conical shape with the top portion 31 projecting to the front side. Each light source 2 is arranged with its optical axis directed toward the center of the housing 4. The front reflecting surface 32 of the reflecting plate 3 is located around the top portion 31, and the rear reflecting surface 33 is located around the outer peripheral ridge line of the front reflecting surface 32. By adopting such a configuration, the light from the light source 2 can be radiated in all directions more uniformly as compared with the luminaire 1. It becomes difficult to feel unevenness. The light source 2 may be configured using, for example, a flexible printed circuit board (FPC) having flexibility as the wiring board 22, and may be disposed along the inner peripheral surface of the housing 4.

  Next, the lighting fixture which concerns on the 3rd modification of this embodiment is demonstrated with reference to FIG. 7, FIG. The lighting fixture 13 has a plurality of auxiliary light sources 7 arranged on the lighting fixture 1 shown in FIGS. Each sub-light source 7 includes an LED 71 as a light emitter and a sub-light source wiring board 72 on which the LED 71 is mounted. The LED 71 is, for example, a white LED, similarly to the LED 21 described above. The wiring board 72 is made of the same material as that of the wiring board 22 described above, and is connected to the power supply circuit 6 similarly to the wiring board 22. The auxiliary light source 7 is disposed on each of two sides of the rectangular housing 4 where the light source 2 is not provided as viewed from the front side, and is provided on the inner surface on the back side of the housing 4. In the present modification, the sub light source 7 is disposed between the housing 4 and the reflector 3 in a state facing the front side at an intermediate position between the light sources 2 facing each other. The reflecting plate 3 has a hole 34 that transmits light from the sub-light source 7 to the front side, a sub-light source reflecting surface 35 that reflects light from the sub-light source 7 to the back side, and a position facing the sub-light source 7. Have A part of the light from the auxiliary light source 7 (the optical path is indicated by a one-dot chain line arrow in FIG. 8A) is irradiated through the hole 34 to the front side. On the other hand, the other part of the light from the sub-light source 7 is reflected by the sub-light source reflecting surface 35 and then irradiated to the back side through the translucent part 41. As shown in FIG. 8B, the lighting fixture 13 has the same configuration as the lighting fixture 1 in a cross section parallel to the optical axis of the light source 2 (see FIG. 2A). Note that the number and arrangement of the sub-light sources 7 are not limited to those of the present modification, and may be appropriately adjusted in order to obtain desired illuminance and light distribution.

  According to this lighting fixture 13, light irradiation to the front side and the back side of the side of the housing 4 where the light source 2 is not provided can be increased by the sub light source 7. Thereby, compared with the lighting fixture 1, while being able to light-emit four sides of a fixture with more uniform illumination intensity and to reduce a brightness nonuniformity, light can be irradiated toward four directions on the back side. Further, in the conventional lighting fixture, only the light from the sub-light source is irradiated on the back side, whereas in the lighting fixture 13, the light from the sub-light source 7 and the light from the light source 2 reflected by the back reflecting surface 33 are used. Is irradiated to the back side. Therefore, a sufficient amount of light can be distributed to the back side even with a smaller number of sub-light sources than in the conventional apparatus.

  Moreover, in this embodiment and any modification, since the wiring boards 22 and 72 and the housing 4 are made of a material having high thermal conductivity, the heat generated by the light emission of the LEDs 21 and 71 can be efficiently performed. It can dissipate heat to the outside world. Thereby, the abnormal temperature rise of LED21,71 can be prevented, and the lifetime of LED21,71 can be extended.

  In addition, the lighting fixture which concerns on this invention is not limited to the said embodiment and its modification, A various deformation | transformation is possible. For example, both the light source and the sub-light source are not limited to white LEDs, and may be composed of LEDs of other colors, or may be composed of cold cathode fluorescent lamps, organic ELs, or the like. Further, the auxiliary light source does not necessarily need to be provided between the housing and the reflecting plate, and the light from the auxiliary light source may be arranged so as to be directly incident on the diffusion plate or the translucent part of the housing. .

DESCRIPTION OF SYMBOLS 1, 11, 12, 13 Lighting fixture 2 Light source 3 Reflective plate 31 Top part 32 Front reflective surface 33 Back reflective surface 34 Hole 4 Case 41 Translucent part 5 Diffuser 7 Sub light source

Claims (5)

A plurality of light sources, a reflecting plate that controls light distribution by reflecting light from these light sources, a housing that has an opening on the front side and accommodates the light source and the reflecting plate, and a light source mounted on the opening side of the housing In a luminaire comprising a diffusion plate that diffuses and transmits light from
The plurality of light sources have LEDs as light emitters, and are arranged with the opening in the state where the optical axis is directed to the center of the casing,
The reflector is a front reflective surface that reflects light from the light source to the front side, and a rear reflection that is disposed closer to the light source than the front reflective surface and reflects light from the light source to the back side. And having a surface,
The housing has a translucent portion on the side surface near the back surface,
The light reflected by the reflective surface for the back surface is irradiated to the back side through the translucent part. The reflection plate is point-symmetric with respect to the center of the housing and is formed so that the top most protrudes toward the front side,
The front reflective surface is formed from a concave curved surface located around the top and recessed to the back side,
2. The back reflecting surface is formed of a concave curved surface that is located around an outer peripheral ridge line of the front reflecting surface and rises from the front reflecting surface. Lighting fixtures.   The lighting apparatus according to claim 1 or 2, wherein the casing is rectangular when viewed from the front side, and the light sources are respectively arranged on four sides of the casing.   The casing is rectangular when viewed from the front side, and the light source is disposed on each of two sides facing each other across the opening of the casing, and is directed toward the back side near the back side of the other two sides. The lighting fixture according to claim 1, further comprising a sub-light source that emits light.   The said sub light source is provided between the said housing | casing and a reflecting plate, The said reflecting plate has a hole which permeate | transmits a part of light from the said sub light source to the front side. lighting equipment.

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