JP2012230762A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control light distribution so as to widen an irradiation range in one direction, while controlling deterioration of utilization efficiency of light and glare.SOLUTION: Since the light distribution in a short length direction is narrowed as a second reflection surface 31 of a light distribution part 3 is formed in a concave surface, the lighting fixture can irradiate light efficiently as compared with the case in which the second reflection surface 31 is a plane. Furthermore, since a third reflection surface 32 is formed in a concave surface rather than a plane parallel to the perpendicular direction (optical axis direction of a light-emitting diode), the light reflected by the third reflection surface 32 hardly enters into a 'glare zone', and as a result, the glare can be controlled. Further, in this embodiment, an inclination angle of the third reflection surface 32 is made close to perpendicular as compared with that of a first reflection surface 30, a degree of the irradiation range becoming narrower can be reduced as compared with the case in which the third reflection surface is of a perpendicular plane.

Description

  The present invention relates to a lighting fixture, and more particularly to a lighting fixture using a light emitting diode as a light source.

  In recent years, lighting fixtures using light-emitting diodes as light sources instead of conventional incandescent lamps and fluorescent lamps have been installed in various places. For example, Patent Document 1 discloses a lighting fixture in which an LED light source device is mounted upward on a flat base, and a semi-cylindrical reflector is disposed so as to cover the LED light source device. The LED light source device includes a rectangular substrate, a plurality of LED chips mounted in a line along the longitudinal direction of the substrate, and a substantially semi-cylindrical transparent resin portion that integrally covers the entire LED chip. . Thus, the light diffused by the transparent resin portion is emitted from the LED light source device, and the diffused and radiated light is reflected by the reflecting plate and irradiated to the illumination space.

JP 2002-299697 A (see paragraphs 0022 to 0024 and FIGS. 4 and 5)

  By the way, in the conventional example described in Patent Document 1, since all the light emitted from the LED light source device is reflected by the reflecting plate and then applied to the illumination space, the emitted light of the LED light source device is directly applied to the illumination space. Compared to the case where the light is used, the light use efficiency is lowered. On the other hand, when part or all of the radiated light of the LED light source device is directly irradiated onto the illumination space, a person in the illumination space tends to feel glare (glare). Incidentally, the range of 30 degrees above and below the line of sight is the “glare zone”, and it is said that if there is a light source with high brightness within this visual range, you will feel glare.

  The present invention has been made in view of the above problems, and an object of the present invention is to perform light distribution control so as to widen an irradiation range in one direction while suppressing reduction in light use efficiency and glare.

  The lighting apparatus of the present invention includes a light emitting unit in which a plurality of light emitting diodes are arranged in a longitudinal direction and mounted on a substrate, a power supply unit that supplies power for light emission to the light emitting unit, and light emitted from the light emitting unit. A light distribution unit that controls the light distribution of the light source, and the light emitting unit, the power supply unit, and a box-shaped instrument body that houses the light distribution unit therein, the light distribution units each having a mirror surface, from the light emitting diode A first reflecting surface, a second reflecting surface, and a third reflecting surface that reflect emitted light, and the first reflecting surface is opposed to the longitudinal direction of the substrate across the plurality of light emitting diodes Each having a concave curved surface inclined in a direction away from the light emitting diode along the optical axis of the light emitting diode, and the second reflecting surface is a short direction of the substrate across the plurality of light emitting diodes Each at a position opposite to And a concave curved surface inclined in a direction away from the light emitting diode along the optical axis of the light emitting diode, and the third reflecting surface includes a plurality of light emitting diodes sandwiching the light emitting diode. A tilt angle of the third reflecting surface with respect to the mounting surface of the substrate, which is formed of a concave curved surface that is provided in pairs at positions facing each other in the longitudinal direction and is inclined in a direction away from the light emitting diode along the optical axis of the light emitting diode. Is larger than the inclination angle of the first reflecting surface with respect to the mounting surface.

  In this lighting fixture, it is preferable that the third reflecting surface is formed in an arc shape that intersects with a plane perpendicular to the optical axis of the light emitting diode in parallel with the long axis of the ellipse.

  The lighting fixture of this invention has the effect that light distribution control can be performed so that the irradiation range to one direction may be expanded, suppressing the fall of the utilization efficiency of light, and a glare.

It is a perspective view of the light distribution part in embodiment of this invention. The light distribution part in the same as above is shown, (a) is a front view, (b) is a cross-sectional view taken along line XX of (a), and (c) is a cross-sectional view taken along line YY of (a). . It is a perspective view same as the above. It is sectional drawing same as the above. FIG. 5 is a sectional view taken along the line ZZ in FIG. FIG. 5 is a cross-sectional view taken along the line WW in FIG.

  Hereinafter, an embodiment in which a technical idea of the present invention is applied to a lighting fixture for illuminating a passage and an eaves will be described in detail with reference to the drawings.

  The lighting fixture of this embodiment is provided with the light emission part 1, the power supply part 2, the light distribution part 3, the instrument main body 4, the packing 5, etc. as shown in FIGS. The light emitting unit 1 is configured by mounting a plurality of light emitting diodes in a line on the surface (lower surface) of a substrate 10 made of several members. The light emitting diode is, for example, a so-called white LED that emits white light by mixing blue light emitted from a light emitting diode chip and yellow light obtained by color-converting the blue light with a phosphor.

  The substrate 10 includes a mounting substrate 11, a wiring board 12, and a heat radiating plate 13. The entire mounting substrate 11 is formed in a rectangular flat plate shape, and six recesses 11A, each of which is mounted with a light emitting diode chip, are arranged in a line in the longitudinal direction (left-right direction in FIG. 4). The wiring board 12 is attached to the front surface (lower surface) side of the mounting substrate 11 with six openings 12A provided at positions corresponding to the recesses 11A. A wiring pattern (not shown) formed on the wiring board 12 and the anode and cathode of each light emitting diode chip are electrically connected by bonding wires (not shown) or the like. A heat radiating plate 13 is disposed on the back surface (upper surface) side of the mounting substrate 11, and heat generated by the light emitting diode chip is conducted from the mounting substrate 11 to the heat radiating plate 13.

  The power supply unit 2 creates a DC power source from an AC power source supplied from a commercial AC power source and supplies the DC power source to the light emitting unit 1. For example, a step-down chopper circuit is provided at a stage subsequent to the step-up chopper circuit for power factor improvement. Connected and configured. However, since such a power supply unit 2 is well known in the art, illustration and description of a detailed circuit configuration are omitted.

  The light distribution unit 3 controls the light distribution of the light emitted from the light emitting unit 1, and spreads the light distribution along the longitudinal direction of the substrate 10, and the short direction of the substrate 10 (left and right direction in FIG. 6). Is configured to narrow the light distribution along and reduce glare. However, the detailed configuration of the light distribution unit 3 will be described later.

  The appliance body 4 is formed in a rectangular box shape by a base 40 and a cover 41, and houses the light emitting unit 1, the power supply unit 2, the light distribution unit 3 and the like inside and is disposed on the ceiling or eaves of the passage. The cover 41 is made of aluminum die-casting, and is formed in a rectangular box shape with one surface having a relatively large area (the upper surface in FIGS. 4 to 6) opened. In addition, a rectangular window through which the light of the light emitting unit 1 controlled by the light distribution unit 2 is extracted from the bottom surface of the cover 41 (the surface opposite to the opening surface, the lower surface in FIGS. 4 to 6). A hole 42 is opened. The window hole 42 is blocked by a transparent panel 43 disposed on the inner bottom surface of the cover 41, and foreign matter and rainwater are prevented from entering. In addition, screw insertion holes 44 pass through both side walls of the cover 41 facing in the longitudinal direction.

  The panel 43 is formed in a rectangular flat plate shape by a synthetic resin having translucency such as acrylic resin. On the bottom surface of the cover 41, bosses 45 are respectively provided on both sides of the window hole 42 along the longitudinal direction. A female screw is formed inside the boss 45, and a metal pressing plate 54 that holds the panel 43 between the peripheral edge of the window hole 42 on the bottom surface of the cover 41 is fixed by a screw 53 that is screwed into the female screw. .

  The base 40 is a rectangular plate-shaped main piece 400, side pieces 401 that fall from the periphery of the main piece 400, and a pair of mounting pieces 402 that fall from both longitudinal edges of the main piece 400, which are integrally formed by a metal plate. Being done. A hole 403 through which a power cord (not shown) for connecting the power supply unit 2 and an external AC power source is inserted passes through the center of the main piece 400. Further, a dish-like recess 404 protruding upward is provided on both sides of the hole 403 in the longitudinal direction of the main piece 400, and a screw insertion hole 404A passes through the bottom of each recess 404.

  A mounting base 6 is provided on the central lower surface of the main piece 400. The mounting base 6 is formed by bending both ends in the longitudinal direction of a rectangular metal plate into a substantially L shape, and fixing both ends to the main piece 400 so that a portion other than both ends (referred to as a central portion). The main piece 400 is arranged apart from and parallel to the main piece 400. And the light distribution part 3 is screwed to the lower surface side of the center part of the mounting base 6, and the light emitting part 1 is attached to the mounting base 6 by sandwiching the substrate 10 between the light distribution part 3 and the mounting base 6. Attached to. The power supply unit 3 is screwed to one end side of the main piece 400 in the longitudinal direction. Further, each of the pair of attachment pieces 402 is provided with a female screw portion 402A.

  In the base 40, the side piece 401 and the pair of mounting pieces 402 are inserted into the opening of the cover 41, and the assembly screw 7 inserted from the outside of the cover 41 into the screw insertion hole 44 is screwed into the female screw portion 402 A of the mounting piece 402. By doing so, it is combined with the cover 41.

  The packing 5 is formed in a rectangular flat plate shape by an elastic material such as synthetic rubber, and is placed on the opening surface (upper surface) side of the cover 41 so as to cover the base 40. In addition, a pair of fitting holes 51 into which the insertion hole 50 communicating with the hole 403 of the base 40 and the concave portion 404 are fitted penetrate the center portion of the packing 5. Further, a fitting groove 52 that fits with the opening edge of the cover 41 is formed on the periphery of the lower surface of the packing 5.

  Next, the structure of the light distribution part 3 which is the gist of the present invention will be described in detail mainly with reference to FIGS.

  The light distribution unit 3 is formed of a molded body formed in a rectangular box shape with one surface (upper surface in FIG. 1) opened by a thermoplastic resin (for example, engineering plastic such as PBT). On the inner bottom surface of the light distribution unit 3, six opening windows 33 through which the light emitting diodes of the light emitting unit 1 are inserted are arranged in a line along the longitudinal direction of the light distribution unit 3. These opening windows 33 are formed such that an edge facing the longitudinal direction of the light distribution portion 3 is formed in an arc shape parallel to the long axis of the ellipse, and an edge facing the short direction of the light distribution portion 3 is formed in a straight line. (See FIG. 2 (a)). On the outer bottom surface of the light distribution section 3, a pair of screw holes 34 for screwing to the mounting base 6 are formed at both ends in the longitudinal direction. In a state where the light distribution unit 3 is screwed to the mounting base 6 and assembled with the light emitting unit 1, the light emitting diode is exposed in the light distribution unit 3 through each opening window 33 (see FIG. 4).

  Inside the light distribution section 3, a first reflecting surface 30, a second reflecting surface 31, and a third reflecting surface 32 each having a mirror surface are formed. The second reflecting surfaces 31 are respectively provided at positions facing the transversal direction of the light distribution section 3 (upper and lower sides of the opening window 33 in FIG. 2A) and from the light emitting diode along the optical axis of the light emitting diode. It consists of a concave curved surface that inclines in a direction away from it (see FIG. 2B). The second reflecting surface 31 intersects with the straight edge of the opening window 33.

  A pair of third reflecting surfaces 32 are provided for each opening window 33 at positions facing the longitudinal direction of the light distribution section 3 across the opening window 33 (on the left and right sides of the opening window 33 in FIG. 2A). And a concave curved surface that inclines in a direction away from the light emitting diode along the optical axis of the light emitting diode (see FIG. 2C). The third reflecting surface 32 is formed in an arc shape in which the shape intersecting the plane perpendicular to the optical axis of the light emitting diode is parallel to the long axis of the ellipse, and intersects with the elliptical arc edge of the opening window 33 ( (See FIG. 2 (a)).

  The first reflecting surfaces 30 are respectively provided at positions facing the longitudinal direction of the light distribution section 3 (on the left and right sides in FIG. 2A), and are inclined away from the light emitting diode along the optical axis of the light emitting diode. It consists of a concave curved surface (see FIG. 2 (c)). The first reflecting surface 30 intersects with the edge of the third reflecting surface 32 at a part (the central portion in the short direction). Further, the inclination angle of the third reflection surface 32 with respect to the mounting surface of the substrate 10 is set larger than the inclination angle of the first reflection surface 30 with respect to the mounting surface of the substrate 10 (see FIG. 2C). That is, the inclination angle of the third reflection surface 32 is closer to the vertical (90 degrees) than the inclination angle of the first reflection surface 30.

  Here, in the use of illuminating the passage and the eaves like the lighting fixture of the present embodiment, it is preferable that the light distribution is controlled so as to expand the irradiation range in one direction (longitudinal direction under the passage and the eaves). On the other hand, it is also necessary to make it difficult for a person who passes under a passage or eaves to feel dazzling, that is, to suppress glare.

  Thus, in the lighting fixture of the present embodiment, the light distribution in the short direction is narrowed by forming the second reflecting surface 31 of the light distribution unit 3 in a concave curved surface, so the second reflecting surface 31 is flat. Compared with the case where it is, it can irradiate light efficiently. Moreover, since the third reflecting surface 32 is not a flat surface parallel to the vertical direction (the optical axis direction of the light emitting diode) but a concave curved surface, the light reflected by the third reflecting surface 32 becomes difficult to enter the “glare zone”. , Glare can be suppressed. Further, in this embodiment, the inclination angle of the third reflection surface 32 is close to the vertical angle compared to the inclination angle of the first reflection surface 30, so that when compared with the case where the third reflection surface is a vertical plane. The degree to which the irradiation range becomes narrow can be reduced.

  As described above, according to the lighting apparatus of the present embodiment, it is possible to perform light distribution control so as to expand the irradiation range in one direction while suppressing a decrease in light utilization efficiency and glare.

DESCRIPTION OF SYMBOLS 1 Light emission part 2 Power supply part 3 Light distribution part 4 Instrument body
10 Board
30 First reflective surface
31 Second reflecting surface
32 3rd reflective surface

Claims (2)

  A light emitting unit in which a plurality of light emitting diodes are arranged in a longitudinal direction and mounted on a substrate, a power supply unit that supplies power for light emission to the light emitting unit, and an arrangement that controls light distribution of light emitted from the light emitting unit. A light-emitting unit, and a light-emitting unit, a power supply unit, and a box-shaped instrument main body that accommodates the light distribution unit. The light distribution units each have a mirror surface and reflect light emitted from the light-emitting diode. A first reflecting surface, a second reflecting surface, and a third reflecting surface, wherein the first reflecting surface is provided at a position facing the longitudinal direction of the substrate across the plurality of light emitting diodes, and the light emitting device; The second reflecting surface is provided at a position facing the short side direction of the substrate across the plurality of light emitting diodes, the concave curved surface being inclined in a direction away from the light emitting diode along the optical axis of the diode. And said light emission The third reflecting surface is opposed to the longitudinal direction of the substrate across the light emitting diodes for each of the plurality of light emitting diodes. A pair of each is provided at a position and is a concave curved surface inclined in a direction away from the light emitting diode along the optical axis of the light emitting diode, and an inclination angle of the third reflecting surface with respect to the mounting surface of the substrate is relative to the mounting surface The lighting fixture characterized by being larger than the inclination-angle of a said 1st reflective surface.   The lighting apparatus according to claim 1, wherein the third reflecting surface is formed in an arc shape parallel to a long axis of an ellipse so that the third reflecting surface intersects a plane perpendicular to the optical axis of the light emitting diode.

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