JP2007059285A - Lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting fixture capable of illuminating the uniform light over a range wider than the conventional ones. <P>SOLUTION: This lighting fixture has a surface-emitting transparent light guide plate 8, and a plurality of light-emitting elements 9 are arranged facing a row to a side-end surface along its longitudinal direction on the respective side end surfaces of this light guide plate 8. In this case, a column 2 is erected from a pedestal part 1, and a lighting part 3 is arranged on the upper part of this column 2, and the lighting part 3 has a frame 7 fixed to the column 2 with a screw or the like. The plurality of light-emitting elements 9 are arranged facing a row in the longitudinal direction of the side-end surface to the side-end surfaces of the respective light guide plates 8 in the inside of this frame 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lighting fixture using a light emitting element such as an LED as a light source.

  Conventionally, fluorescent lamps and incandescent lamps are widely used as illumination light sources such as lighting stands. However, fluorescent lamps and incandescent lamps that use an illumination light source consume a lot of power and have a long service life. Further, it is difficult to maintain, and further, it is difficult to reduce the weight because an inverter, a ballast, and the like are required as a lighting circuit.

  Therefore, in recent years, there has been an active movement to use LEDs as illumination light sources. For example, conventionally, as a lighting stand, a plurality of LEDs are linearly arranged on a wiring board, and a lamp body is formed that has an opening that emits light from the LEDs to the outside. The light transmitting plate is arranged, and a condensing portion for condensing light from the LED and a diffusion portion for diffusing light emitted from the edge of the through hole plate are formed on the light transmitting plate. Has been proposed (see, for example, Patent Document 1).

Compared with the case where a fluorescent lamp or an incandescent lamp is used as the light source, this conventional configuration eliminates the need for lighting circuit components such as an inverter and a transformer, reduces the overall weight of the apparatus, and requires light emitted from the LED to There is an advantage that the irradiation surface can be irradiated uniformly.
JP 2004-103380 A

  However, since the illumination stand described in Patent Document 1 has a configuration in which a translucent plate is disposed facing a lamp body in which a plurality of LEDs are linearly disposed on a wiring board, This is equivalent to replacing a fluorescent lamp. Therefore, light can be irradiated relatively uniformly in the LED arrangement direction, but the light irradiation range in the direction perpendicular to this is limited, and straight tube type fluorescent light is emitted. It is difficult to irradiate light over a sufficiently wide range than a lamp.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a luminaire that can irradiate uniform light over a sufficiently wider range than before.

  In order to achieve the above object, the luminaire of the present invention includes a transparent light guide plate for surface light emission, and at least one side end surface of the light guide plate extends along the longitudinal direction and faces the side end surface. A plurality of light emitting elements are arranged in a line.

  The lighting fixture of the present invention is configured to cause the light guide plate to emit light, that is, to introduce light of the light emitting element from the side end surface of the light guide plate, and to radiate the introduced light from the main surface side of the light guide plate to the outside. It is possible to irradiate light uniformly over a sufficiently wide range than before.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a lighting stand as a lighting fixture in Embodiment 1 of the present invention. In the lighting stand according to the first embodiment, a support column 2 is erected from a pedestal unit 1, and an illumination unit 3 is provided above the support column 2.

  The pedestal portion 1 is provided with an on / off switch 4 and a dimming knob 5. On the other hand, the illumination unit 3 has a frame 7 fixed to the support column 2 with screws or the like, and one end of a flat light guide plate 8 that is semi-elliptical in plan view is inserted and fixed to the left and right of the frame 7. Yes. A plurality of light emitting elements 9 are arranged in a row in the frame 7 so as to face the side end faces of the respective light guide plates 8 and along the longitudinal direction of the side end faces, and each light emitting element 9 is mounted. The circuit board 10 is attached and configured.

  The light guide plate 8 is made of, for example, a transparent resin (for example, acrylic resin or polycarbonate resin) having a thickness of about 10 mm to 20 mm, and the main surface (lower surface) 8a on the light emission side is triangular in cross section. A concavo-convex structure having a shape is formed. Thereby, the light emitted from the light guide plate 8 is diffused. In this case, the concavo-convex structure of the main surface (lower surface) 8a may be formed such that the surface roughness on the near side of the light emitting element 9 is large and the surface roughness gradually decreases as the distance from the near side increases. . Thereby, the occurrence of luminance unevenness in the left-right width direction in the drawing of the light guide plate 8 is further suppressed.

  A reflective film 12 is formed on the back surface (upper surface) side facing the main surface (lower surface) 8 a on the light emission side of the light guide plate 8. Furthermore, for example, a reflective dot having a triangular shape in a cross-sectional view may be provided on the back surface (upper surface) side of the light guide plate 8. This makes it possible to further reduce luminance unevenness by changing the refraction angle. A reflective cover can be attached instead of forming the reflective film 12 on the back surface.

  The light emitting element 9 is, for example, an LED that emits white light (for example, a white LED that combines a blue LED and a yellow phosphor, or a multi-chip white LED that combines R, G, and B3 primary color LEDs). Applies. In this case, the arrangement interval between the light emitting elements 95 is set so that a part of the radiated light of each light emitting element 9 overlaps with each other in the longitudinal direction of the side end face of the light guide plate 8. The occurrence of luminance unevenness in the width direction is suppressed.

  In the lighting stand having the above configuration, when the light emitting elements 9 are turned on, the light from each light emitting element 9 is directly introduced into the inside from the side end surfaces of the left and right light guide plates 8, and the introduced light is the main surface of each light guide plate 8. (Lower surface) Radiated to the outside from the 8a side. In this case, the main surface (lower surface) 8 a on the light emission side of the light guide plate 8 is formed so that the surface roughness gradually decreases from the proximity side to the tip side of the light emitting element 9. A large amount of light radiated to the outside from the main surface (lower surface) 8a on the near side is scattered, and scattering of light radiated to the outside from the main surface (lower surface) 8a on the tip side is reduced.

  For this reason, in each light guide plate 8, the planar light intensity distribution is substantially uniform over the entire surface, and a surface emission state with extremely little luminance unevenness can be obtained. Moreover, since the light guide plate 8 emits surface light, this lighting stand can irradiate light uniformly over a sufficiently wide range as compared with the straight tube type fluorescent lamp and the lighting apparatus disclosed in Patent Document 1.

  The lighting stand of the first embodiment has one end portion of the light guide plate 8 inserted and fixed on the left and right sides of the frame 7 attached to the upper portion of the support column 2 erected from the pedestal portion 1. For example, as shown in FIG. 2, one end of the light guide plate 8 is inserted and fixed only on one side of the frame 7, and a plurality of light emitting elements 9 and a circuit board on which these are mounted in the frame 7. 10 may be provided.

  FIG. 3 is a perspective view showing a lighting stand as a lighting fixture according to the second embodiment of the present invention, and the same reference numerals are given to portions corresponding to or corresponding to the configuration of the first embodiment. In the lighting stand according to the second embodiment, a column 2 is erected from a pair of left and right pedestal units 1, and the lighting unit 3 is fixedly supported between the columns 2.

  The illumination unit 3 has both ends of a light emitting plate 8 for surface light emission formed in an arch shape inserted and fixed to a frame 7 fixed to the left and right support columns 2 with screws or the like. 7, a plurality of light emitting elements 9 are arranged in a row facing the side end face of the light guide plate 8 and along the longitudinal direction of the side end face, and a circuit board 10 on which each light emitting element 9 is mounted. Is provided.

  Also in the lighting stand of this configuration, when the light emitting elements 9 are turned on, the light from each light emitting element 9 is directly introduced into the inside from both side end surfaces of the light guide plate 8, and the introduced light is the main surface (lower surface) of the light guide plate 8. Radiated from the 8a side to the outside.

  As described above, in the illumination stand of the second embodiment, since the light guide plate 8 emits light, the light can be irradiated uniformly over a sufficiently wide range. Therefore, it can be used as, for example, an outdoor gate or an arcade lighting stand. Other configurations and operational effects are the same as those of the first embodiment, and thus detailed description thereof is omitted here.

  FIG. 4 is a perspective view showing a lighting apparatus according to Embodiment 3 of the present invention, and the same reference numerals are given to portions corresponding to or corresponding to the configuration of Embodiment 1. The lighting fixture according to Embodiment 3 has a frame 7 that is directly attached to a crosspiece, a wall surface, or the like, and one end of a planar light-emitting light-guiding plate 8 is inserted and fixed to the frame 7. . A plurality of light emitting elements 9 are arranged in a row in the frame 7 so as to face the side end face of the light guide plate 8 and along the longitudinal direction of the side end face, and each light emitting element 9 is mounted. A circuit board 10 is provided.

  Also in the lighting stand having this configuration, when the light emitting elements 9 are turned on, the light from each light emitting element 9 is directly introduced into the inside from the side end face of the light guide plate 8. Radiated from the 8a side to the outside.

  Thus, since the light guide plate 8 also emits light in the lighting fixture of Embodiment 3, it is possible to irradiate light uniformly over a sufficiently wide range. Therefore, this luminaire can be used, for example, for a kid's learning desk luminaire or a nameplate. Other configurations and operational effects are the same as those of the first embodiment, and thus detailed description thereof is omitted here.

  In addition, in each lighting fixture of said each Embodiment 1-3, although acrylic resin and polycarbonate resin are used as transparent resin used as the light-guide plate 8, for example, acrylic resin is copolymerized with another monomer. If the resin properties are modified to make room temperature plasticity, it is more convenient because the direction of illumination can be freely adjusted by bending the light guide plate 8 as necessary.

  For example, when the lighting apparatus according to Embodiment 3 shown in FIG. 4 is attached to a child's learning desk, the light guide plate 8 is made flat as shown in FIG. 5 (see FIG. 4A), or It is convenient to bend the light guide plate 8 (see FIG. 5B) to change the direction of illumination, so that optimal brightness can be ensured during learning.

  Also, a transparent silicon resin is used as the material of the light guide plate 8, and a thin metal plate can be integrally joined to the back side of the silicon resin so as to have room temperature plasticity. This is convenient because the lighting direction can be freely adjusted. Moreover, in said Embodiment 1, 2, it is also possible to comprise the support | pillar 2 with a flexible pipe and to comprise so that the illumination part 3 can incline freely.

It is a perspective view which shows the lighting stand as a lighting fixture in Embodiment 1 of this invention. It is a perspective view which shows the modification of the illumination stand of Embodiment 1 of this invention. It is a perspective view which shows the illumination stand as a lighting fixture in Embodiment 2 of this invention. It is a perspective view which shows the lighting fixture in Embodiment 3 of this invention. It is a side view which shows the application example of the lighting fixture of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Illumination part 7 Frame 8 Light guide plate 8a Main surface 9 Light emitting element 10 Circuit board

Claims (1)

  A transparent light guide plate for surface light emission is provided, and at least one side end surface of the light guide plate has a plurality of light emitting elements arranged in a row along the longitudinal direction and facing the side end surface. Lighting equipment.

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