JP2013077454A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device capable of securing uniform plane light emission by virtue of configuration that a reflecting plate is positioned in such a manner that, the further it is away from an LED light source, the further its another face is near to a diffusion plate.SOLUTION: The illumination device is provided with: a flat, nearly box-shaped housing 11 with an opening 11a formed on its front; the diffusion plate 13 closing the opening 11a to form a lamp room 12 inside a housing 11 and transmitting illumination light flux P1, P2; the plurality of LED light sources 14 arranged on one face 11b orthogonal to the diffusion plate 13, out of inner wall faces of the housing 11; and the reflecting plate 15 arranged over in a slanted state from between a bottom face 11c opposed to the opening 11a of the housing 11 and the LED light sources 14 to between the other face 11d opposed to that one face 11b and the opening 11a for reflecting the illumination light flux P1, P2 emitted from the LED light sources 14 toward the diffusion plate 13.

Description

  The present invention relates to a thin lighting device using an LED as a light source.

  In recent years, various lighting devices using LEDs as light sources have been proposed because of their low power consumption and long life.

  At this time, in particular, a thin light-emitting device that uses a small number of LED light sources and is expected to have surface emission is known (for example, see Patent Document 1). This is effective when the distance from the light source to the light emitting surface is long, but there is a problem that it is expensive and the brightness is low.

  Therefore, the light illuminating device main body is thin and a small number of LED light sources, and the light diffusing film and the reflecting plate are arranged in parallel and facing each other in a separated state as one that realizes surface emission (see, for example, Patent Document 2). ), And a highly reflective coating film formed on the inner wall surface of the housing (see, for example, Patent Document 3).

JP 2011-187418 A JP 2011-144881 A JP 2011-158874 A

  However, in the case where the light diffusing film and the reflecting plate are arranged in parallel and facing each other in a separated state, it is said that uniform surface emission cannot be obtained unless a plurality of (two opposing) LED light sources on the inner wall surface of the housing are arranged. There was a problem.

  In addition, in the case where a highly reflective paint film is formed on the inner wall surface of the housing, if the LED light source is not disposed at a plurality of locations near the center of the lamp chamber formed by the housing and the lens, the height of the entire inner wall surface of the housing is increased. There was a problem that uniform surface light emission using a reflective paint film was not achieved. Moreover, when an LED light source is arranged near the center of the lamp chamber, a part of the illumination light beam emitted from the LED light source becomes a direct illumination light beam, making it difficult to achieve uniform surface light emission. There was a problem of being.

  Such a surface-emitting illumination device is advantageous in terms of costs such as electricity bill and consumption period, compared with conventional illumination devices using light bulbs or fluorescent tubes as light sources, but its light source characteristics Therefore, there is a new problem that it is difficult to ensure uniform surface light emission.

  On the other hand, from the viewpoint of the user, it is not only advantageous in terms of cost, but also apparently has a uniform light emitting surface and light amount (brightness) LED illumination device that is similar to a conventional illumination device using a light bulb, a fluorescent tube, or the like. Is desired.

  Therefore, the present invention provides an illuminating device that can ensure uniform surface light emission using a small number of LED light sources while using an LED as a light source, and maintaining a low thickness. With the goal.

  In order to solve the above-described problems, an illumination device according to the present invention includes a flat, substantially housing-shaped housing having an opening formed on the front surface, a lamp chamber formed inside the housing by closing the opening, and an illumination beam. A diffusion plate that transmits light, a plurality of LED light sources disposed on one surface orthogonal to the diffusion plate among the inner wall surfaces of the housing, and the one surface from between the bottom surface of the housing that faces the opening and the LED light source. And a reflector that reflects the illumination light beam emitted from the LED light source toward the diffuser. The reflector is disposed between the other surface facing the aperture and the opening.

  According to such a configuration, since the reflection plate is positioned closer to the diffusion plate on the other surface side farther from the LED light source, uniform surface light emission can be ensured.

  A plurality of the LED light sources are arranged along the longitudinal direction of the housing, and the reflector is inclined along the edge direction of the housing and in the thickness direction of the housing.

  According to such a configuration, it is possible to effectively use the illumination light beam emitted from the LED light source, and to maintain high reflection efficiency by the reflector.

  The reflection plate is formed of a curved surface or a parabolic surface, and a total reflection film having a high reflectance is provided on the reflection surface.

  According to such a configuration, the light distribution of the illumination light beam emitted from the LED light source can be controlled by the reflecting plate, and more uniform surface emission can be ensured.

  In the illumination device of the present invention, since the reflection plate is positioned closer to the diffusion plate on the other surface side farther from the LED light source, uniform surface emission can be ensured.

1 shows a lighting device according to an embodiment of the present invention, in which (A) is a front perspective view of the lighting device, and (B) is a rear perspective view. BRIEF DESCRIPTION OF THE DRAWINGS The lighting apparatus of one Embodiment of this invention is shown, (A) is a bottom view of a lighting apparatus, (B) is a front view of a lighting apparatus, (C) is a side view of a lighting apparatus. It is the perspective view of the front side which showed the illuminating device which concerns on one Embodiment of this invention, and removed the diffusion plate. It is sectional drawing of the illuminating device of one Embodiment of this invention.

  Next, an illumination device according to an embodiment of the present invention will be described with reference to the drawings. In addition, although the Example shown below is a suitable specific example in the illuminating device of this invention, and there may be various technically preferable restrictions, the technical scope of this invention limits this invention especially. Unless otherwise stated, the present invention is not limited to these embodiments. In addition, the constituent elements in the embodiments shown below can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the embodiment described below does not limit the contents of the invention described in the claims.

  1 shows a lighting device according to an embodiment of the present invention, FIG. 1A is a front perspective view of the lighting device, FIG. 1B is a rear perspective view, and FIG. FIG. 2A is a bottom view of the lighting device, FIG. 2B is a front view of the lighting device, FIG. 2C is a side view of the lighting device, and FIG. The illuminating device which concerns on one Embodiment is shown, The perspective view of the front side which removed the diffusion plate, FIG. 4 is sectional drawing of the illuminating device of one Embodiment of this invention.

  In the figure, an illuminating device 10 includes a flat, substantially housing-shaped housing 11 having an opening 11a formed on the front surface, a lamp chamber 12 formed inside the housing 11 by closing the opening 11a, and illumination beams P1, P2. A plurality of LED light sources 14 disposed on one surface 11 b orthogonal to the diffusion plate 13 among the inner wall surface of the housing 11, and a bottom surface 11 c of the housing 11 facing the opening 11 a and the LED light sources 14. A reflecting plate 15 that is disposed in an inclined state between the other surface 11d facing the one surface 11b and the opening 11a and reflects the illumination light beams P1 and P2 emitted from the LED light source 14 toward the diffusion plate 13; I have.

  The housing 11 is made of light metal such as aluminum or aluminum alloy, and has a heat sink function for absorbing (dissipating) heat generated when the LED light source 14 is turned on. In addition, the installation place (as needed of the average use time etc.) as the illuminating device 10 may be integrally formed, and you may fix separately. Further, in the present embodiment, both ends in the longitudinal direction of the housing 11 are opened by extrusion molding of aluminum, and the diffuser plate 13, the LED light source 14, and the reflection plate 15 are housed using the open ends. . A resin cap 16 is screwed to the open end, thereby closing the open end. Furthermore, a flange-shaped fixing portion 11e (not shown in some drawings) is provided at an upper surface corner along the longitudinal direction of the housing 11.

  The diffusion plate 13 is formed mainly of a resin material having a relatively high transmittance such as polycarbonate, polyester, acrylic, etc. (as a raw material characteristic, about 85% to 90% in a wavelength region of 400 nm to 1100 nm), It is colorless and transparent or colored (white) and transparent. Further, the diffusion plate 13 has a diffusion function by forming a minute and random lens array and diffusing and shaping the illumination light beams P1 and P2 reflected by the reflection plate 15, for example. Ensures light emission. At this time, the diffusion plate 13 can also take into consideration securing of anti-glare properties, reduction of multi-shadows, and the like depending on the installation location of the lighting device 10 and the like. The diffusion plate 13 tends to decrease the transmittance when the diffusivity is increased. Therefore, considering the white transparency, the dispersity is 30 ° C. to 40 ° C. and the transmittance is 60 in the visible light region (360 nm to 830 nm). % To around 70%.

  The LED light sources 14 are mounted on a control board 17 fixed to one surface 11 b of the housing 11, and a plurality of LED light sources 14 are arranged along the longitudinal direction of the housing 11.

  The reflection plate 15 is disposed over substantially the entire width in the longitudinal direction of the housing 11, and is inclined in the thickness direction of the housing 11 along the direction of the edge of the housing 11. Further, both edge portions 15 a and 15 b along the longitudinal direction of the housing 11 are fixed to the bottom surface 11 c and the other surface 11 d of the housing 11. Furthermore, although the reflecting plate 15 may be a flat plate, it may be formed of a curved surface or a paraboloid, for example. Further, a total reflection film having a high reflectance is provided on the reflection surface 15 c of the reflection plate 15. In addition, as a highly reflective total reflection film, for example, aluminum is vacuum-deposited and a protective film of magnesium fluoride or silicon oxide is formed on the surface, or a multi-layer dielectric film is formed. The one that efficiently reflects the illumination light beams P1 and P2 in the visible light region is used, such as the one having a high reflectance.

  Thereby, in addition to the uniform surface emitting function of the diffusion plate 13, the intersection of the emission direction and the illumination direction associated with the arrangement of the LED light source 14 on one surface 11b for flattening the illumination device 10, and the one surface 11b Due to the distance from the other surface 11d, it is possible to suppress the cause of unevenness in the light emission amount of the illumination light beams P1 and P2 emitted from the LED light source 14.

  Therefore, the illumination light fluxes P1 and P2 emitted from the LED light source 14 are totally reflected by the reflection surface 15c of the reflection plate 15, and then can ensure uniform surface light emission in cooperation with the diffusion function of the diffusion plate 13. it can.

  Thus, in the illuminating device of the present invention, since the reflector 15 is located closer to the diffuser 13 as it goes to the other surface 11d farther from the LED light source 14, it is possible to ensure uniform surface light emission. Can do.

P1 ... illumination beam P2 ... illumination beam 10 ... illuminating device 11 ... housing 11a ... opening 11b ... one surface 11c ... bottom surface 11d ... other surface 11e ... fixed portion 12 ... lamp chamber 13 ... diffusing plate 14 ... LED light source 15 ... reflecting plate 15a ... Edge 15b ... Edge 15c ... Reflecting surface 16 ... Cap 17 ... Control board

Claims (3)

  A flat, substantially housing-shaped housing having an opening formed on the front surface, a diffusion plate that closes the opening to form a lamp chamber inside the housing and transmits an illumination light beam, and an inner wall surface of the housing A plurality of LED light sources arranged on one surface orthogonal to the diffuser plate, and an inclined state between the opening and the other surface facing the one surface from between the bottom surface of the housing facing the opening and the LED light source And a reflection plate that reflects the illumination light beam emitted from the LED light source toward the diffusion plate.   2. The LED light source according to claim 1, wherein a plurality of the LED light sources are arranged along a longitudinal direction of the housing, and the reflecting plate is inclined along the edge direction of the housing and in the thickness direction of the housing. Lighting equipment.   The lighting device according to claim 1, wherein the reflecting plate is formed of a curved surface or a parabolic surface, and a total reflection film having a high reflectance is provided on the reflecting surface.

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