JP2013098083A - Lighting fixture - Google Patents

Abstract

In a lighting fixture using a plurality of light emitting diodes as a light source, graininess and uneven brightness are suppressed without using a separate member such as a translucent panel having diffusibility.
A plurality of light emitting diodes (2) and a reflecting plate (4) for controlling light distribution are provided on the instrument body (1). The light emitting diodes 2 are arranged on lattice points of a two-dimensional lattice having lattice axes in a first direction and a second direction intersecting each other on one plane, and the arrangement interval in the first direction is the second It arrange | positions so that it may become narrower than the arrangement | positioning space | interval of a direction. The reflecting plate 4 is adjacent to the two first reflecting surfaces 43 provided on both sides in the second direction with respect to the row of the light emitting diodes 2 arranged along the first direction in the first direction. And a second reflecting surface 44 provided between each pair of light emitting diodes 2. The first reflecting surface 43 has a height dimension from the surface on which the light emitting diode 2 is disposed, and has a second reflecting surface. It is set larger than the surface 44.
[Selection] Figure 1

Description

  The present invention relates to a lighting fixture including a light emitting diode as a light source.

  In recent years, from the viewpoint of energy saving, a light emitting diode (hereinafter abbreviated as “LED”) has been adopted as a light source of a lighting fixture. Since the LED is a point light source, it is necessary to use a plurality of LEDs when used as a light source of a lighting fixture. For example, as shown in FIG. 6 and FIG. 7, a plurality of LEDs 20 are arranged on a fixture body 10 in a lighting fixture that is installed on the ceiling of an office and used as a base light that secures the illuminance of the entire space. The illustrated lighting fixture includes a fixture body 10 having a rectangular opening window, and a plurality of LEDs 20 are arranged in a plane along the opening surface of the opening window of the fixture body 10. The LEDs 20 are arranged on lattice points of a two-dimensional square lattice having a lattice axis along the periphery of the opening window. Hereinafter, one direction of the lattice axis is referred to as a first direction, and the other direction of the lattice axis is referred to as a second direction. In other words, the first direction and the second direction correspond to a longitudinal direction and a lateral direction in the plane along the opening surface of the opening window.

  A reflection plate 40 is disposed on the instrument body 10 along the opening surface. The reflector 40 has a plurality of holes that expose the LEDs 20 to the opening window side of the instrument main body 10, and the light distribution of the light emitted from the LEDs 20 is controlled from each hole of the instrument main body 10 to each LED 20. It has a plurality of depressions that expand toward the opening window. Each recess is surrounded by four reflecting surfaces 430 and 440 including two reflecting surfaces 430 spaced in the first direction and two reflecting surfaces 440 spaced in the second direction. As shown in FIG. 8, the reflecting surface 430 and the reflecting surface 440 have the same height dimension H3 from the hole and the same inclination angle with respect to the opening surface of the opening window in the direction orthogonal to the opening surface of the opening window. It is formed to become. In addition, the broken line in a figure has shown the light beam radiated | emitted from LED20.

  In the lighting fixture having the above configuration, the light distribution is controlled by the depression corresponding to each LED 20, and the height H3 is equal between the reflecting surface 430 spaced in the first direction and the reflecting surface 440 spaced in the second direction. In the lighting fixture alone, the light emitted from each LED 20 is not mixed. That is, since the light whose light distribution is controlled by the reflector 40 is individually separated for each LED 20, a grainy feeling occurs when the lighting fixture is viewed. Also, if the light output of the LED 20 varies due to variations in the characteristics of the individual LEDs 20, unevenness in luminance occurs depending on the aperture window.

  Patent Document 1 describes a configuration in which a translucent panel having diffusibility is disposed on the exit side of a reflecting plate. In the luminaire described in Patent Document 1, since the reflector 40 is covered with a transmissive panel having diffusibility, the graininess when the luminaire is viewed is alleviated, and uneven brightness is also alleviated. The effect can be expected.

JP 2010-118186 A

  However, when a translucent panel is used as in the lighting fixture described in Patent Document 1, a translucent panel is added in addition to the reflector 40, which increases the number of parts and leads to high costs. Arise.

  The present invention has been made in view of the above reasons, and the purpose thereof is a lighting apparatus using a plurality of light emitting diodes as a light source, without using a separate member such as a translucent panel having diffusibility. An object of the present invention is to provide a lighting apparatus that suppresses graininess and uneven brightness.

  The present invention includes an instrument body, a plurality of light emitting diodes as light sources, and a reflector that controls light distribution by reflecting light emitted from the light emitting diodes, and the light emitting diodes are on a plane. Are arranged on lattice points of a two-dimensional lattice having lattice axes in the first direction and the second direction intersecting with each other, and the arrangement interval in the first direction is narrower than the arrangement interval in the second direction. The reflecting plate includes two first reflecting surfaces provided on both sides in the second direction with respect to the row of light emitting diodes arranged along the first direction; A second reflecting surface provided between each pair of the light emitting diodes adjacent in the direction of, the height of the first reflecting surface from the surface on which the light emitting diode is disposed, Larger setting than the second reflecting surface It is characterized in that is.

  In this lighting fixture, the first reflection surface and the second reflection surface are inclined with respect to a surface on which the light emitting diode is disposed, and the first reflection surface has an inclination angle with respect to the surface. It is desirable that it is set smaller than the second reflecting surface.

  In this lighting fixture, the reflector includes a third reflecting surface at both ends in the first direction, and the third reflecting surface has a height dimension from the surface on which the light emitting diode is disposed. It is desirable to set it larger than the second reflecting surface.

  According to the configuration of the present invention, in a lighting apparatus using a plurality of light emitting diodes as light sources, the graininess and luminance unevenness are suppressed without using another member such as a transmissive panel having diffusibility. There is.

It is a perspective view which shows this embodiment. It is an exploded perspective view same as the above. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. (A) is an expanded sectional view of the AA line cross section in FIG. 1, (b) is an expanded sectional view of the BB line cross section in FIG. It is a perspective view which shows a conventional structure. It is CC sectional view taken on the line of FIG. It is an expanded sectional view of the CC line cross section in FIG.

  In the present embodiment, for example, a lighting apparatus disposed on the ceiling of an office will be described as an example. This type of lighting fixture is mainly used for base light applications. As shown in FIGS. 1 to 3, a lighting fixture described in the present embodiment is provided with a fixture body 1 fixed to a ceiling or the like, and a plurality of light emitting diodes (hereinafter abbreviated as “LEDs”) 2. The movable frame 7 is provided. As shown in FIG. 2, the movable frame 7 controls the light distribution by reflecting a plurality of mounting substrates 3 (four in the illustrated example) on which a plurality of LEDs 2 are mounted and light emitted from the LEDs 2. The reflecting plate 4 is held. 1 and 2 are shown upside down for convenience of illustration, but when the instrument body 1 is fixed to the ceiling, the upper part of the instrument body 1 is embedded in the ceiling, and the movable frame 7 Will be exposed from the ceiling.

  The instrument body 1 hangs from two parallel sides of the upper wall 11 formed in a rectangular shape and the peripheral edge of the upper wall 11 (extending upward in FIGS. 1 and 2). , 13 and a U-shaped cross section. One side wall 12 is provided with a terminal block 15 for connecting a power line (not shown) for supplying power to the lighting fixture.

  The movable frame 7 includes a mounting plate 5 that holds the mounting substrate 3 and the reflection plate 4, and a decorative frame 6 that is coupled to the peripheral portion of the mounting plate 5. As shown in FIGS. 3 and 4, the movable frame 7 is attached to the instrument main body 1 via a holding spring 53 made of a pinch spring. Two holding springs 53 are provided on the periphery of the mounting plate 5 and are inserted from below into a through hole (not shown) formed in the upper wall 11 of the instrument body 1. Therefore, the movable frame 7 is suspended from the instrument main body 1 by the two holding springs 53 and can be stopped at any position in the vertical direction with respect to the instrument main body 1. The function of this type of holding spring 53 is well known and will not be described in detail.

  On the lower surface of the mounting plate 5, the mounting substrate 3 and the reflection plate 4 are disposed so as to overlap each other. The mounting substrate 3 is formed in an elongated plate shape. On one surface of the mounting substrate 3 in the thickness direction, a plurality of LEDs 2 are arranged at equal intervals along the longitudinal direction. Further, the mounting boards 3 are arranged at equal intervals on the lower surface of the mounting plate 5 in the direction orthogonal to the longitudinal direction, and are fixed to the mounting plate 5 using, for example, screws. Further, the arrangement interval of the mounting substrates 3 is set so that the arrangement interval of the LEDs 2 in the direction in which the mounting substrates 3 are arranged is larger than the arrangement interval of the LEDs 2 on the mounting substrate 3. Hereinafter, in a state where the mounting substrate 3 is attached to the mounting plate 5, the longitudinal direction of the mounting substrate 3 is referred to as a first direction, and a direction orthogonal to the first direction (that is, the direction in which the mounting substrates 3 are arranged) is the first direction. Called the 2 direction. That is, the light emitting diode 2 is arranged on a lattice point of a two-dimensional lattice having the first direction and the second direction as lattice axes.

  In the present embodiment, the reflector 4 is configured by arranging two reflectors 41 side by side. The reflector 41 is fixed to the mounting plate 5 using screws, for example. Each reflector 41 is disposed so as to straddle the two mounting boards 3 and includes a plurality of window holes 46 that expose the plurality of LEDs 2 mounted on the mounting board 3 to the lower surface side. Accordingly, a single reflector 41 is formed with two rows of window holes 46 arranged in a row along the first direction and spaced apart in the second direction.

  On the lower surface of the reflector 41, four first reflecting surfaces 43 are formed along the first direction, and two each between a pair of window holes 46 adjacent in the first direction. The second reflecting surface 44 is formed. The reflector 41 includes third reflecting surfaces 45 at both ends of each row of the window holes 46 arranged in the first direction. That is, two first reflective surfaces 43 are formed with one row of window holes 46 arranged in the first direction, and two second windows are formed with one window hole 46 in the first direction. The second reflection surface 44 or one second reflection surface 44 and one third reflection surface 45 are formed. The second reflecting surface 44 and the third reflecting surface 45 are in contact with the first reflecting surface 43 in the second direction. The first reflective surface 43, the second reflective surface 44, and the third reflective surface 45 are normally coated with a white reflective paint so that diffuse reflection is possible.

  The two first reflecting surfaces 43 sandwiching one row of the window holes 46 are inclined downward from the window holes 46 in the second direction in a direction away from the window holes 46. In other words, the two first reflecting surfaces 43 facing the window hole 46 are inclined so as to increase the distance from the window hole 46 downward. The second reflecting surface 44 and the third reflecting surface 45 facing the window hole 46 are inclined downward from the window hole 46 in the first direction so as to be separated from the window hole 46. The first reflection surface 43 is set to have an inclination angle smaller than that of the second reflection surface 44 and the third reflection surface 45 with respect to the plane including the opening surface of the window hole 46. That is, the second reflecting surface 44 and the third reflecting surface 45 rise at a steeper angle than the first reflecting surface 43. The plane including the opening surface of the window hole 46 is substantially parallel to one surface in the thickness direction of the mounting substrate 3 in a state where the reflector 41 is fixed to the mounting plate 5.

  Incidentally, as shown in FIG. 5, the first reflecting surface 43 has a height dimension (indicated by reference numeral H <b> 1 in FIG. 5) from the plane including the opening surface of the window hole 46, and the height of the second reflecting surface 44. It is formed to be larger than the size (indicated by reference numeral H2 in FIG. 5). The height of the third reflecting surface 45 is equal to that of the first reflecting surface 43.

  Therefore, as shown in FIG. 5, the second reflecting surface 44 is irradiated only with the light emitted from the individual LEDs 2 (in FIG. 5, the light flux is indicated by a broken line), but the first reflecting surface 44 The surface 43 is irradiated with light emitted from two adjacent LEDs 2. That is, light from the two LEDs 2 is irradiated to a portion of the first reflecting surface 43 below the second reflecting surface 44, and the graininess is relieved at this portion. Even if a difference occurs in the light output, the luminance unevenness is alleviated.

  If the structure mentioned above is employ | adopted, the arrangement | positioning space | interval of LED2 will become larger than a 1st direction in a 2nd direction. That is, it is possible to reduce the number of LEDs 2 as compared with the case where the LEDs 2 have the same arrangement interval in the first direction and the second direction.

  In the configuration example described above, the reflector 41 having a size straddling the two mounting substrates 4 is used, and the reflecting plate 4 is configured by the two reflectors 41, but one sheet is provided for each mounting substrate 4. The reflector 41 may be used, and the reflector 4 may be configured by four reflectors 41. One reflector 41 straddling the four mounting substrates 3 may be used as the reflector 4. Furthermore, it is not essential to use four mounting boards 3 for the instrument body 1, and the number of mounting boards 3 associated with the instrument body 1 can be selected as appropriate.

1 Instrument body 2 Light-emitting diode (LED)
4 Reflecting plate 43 First reflecting surface 44 Second reflecting surface 45 Third reflecting surface 5 Mounting plate

Claims (3)

  An apparatus main body, a plurality of light emitting diodes as light sources, and a reflecting plate that controls light distribution by reflecting light emitted from the light emitting diodes, the light emitting diodes intersecting each other on a plane. Arranged on the lattice points of a two-dimensional lattice having lattice axes in the first direction and the second direction, and disposed in such a manner that the arrangement interval in the first direction is narrower than the arrangement interval in the second direction. The reflection plate is adjacent to the first light-reflecting surfaces provided on both sides in the second direction with respect to the row of light-emitting diodes arranged along the first direction in the first direction. A second reflecting surface provided between each pair of the light emitting diodes, wherein the first reflecting surface has a height dimension from the surface on which the light emitting diodes are disposed, It is set larger than the surface Luminaire characterized by and.   The first reflection surface and the second reflection surface are inclined with respect to a surface on which the light emitting diode is disposed, and the first reflection surface has an inclination angle with respect to the surface, the second reflection surface. The lighting fixture according to claim 1, wherein the lighting fixture is set smaller than the reflecting surface.   The reflecting plate includes third reflecting surfaces at both ends in the first direction, and the third reflecting surface has a height dimension from the surface on which the light emitting diode is disposed, and the second reflecting surface has the second reflecting surface. The lighting apparatus according to claim 1, wherein the lighting apparatus is set to be larger than a surface.

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