JP2003323807A - Surface light source device and display device using the same - Google Patents

Abstract

To provide an edge light type surface light source device that can easily replace a primary light source lamp. A straight tube lamp 4 and a reflector 12 and a frame body 14 covering these are disposed adjacent to an end face of a light guide plate 2 and light incident on the light guide plate 2 from the lamp 4 is emitted to a light exit surface 2b. The light is emitted from. The reflector 12 and the frame body 14 are divided into a first portion 12A; 14A located on the light emitting surface 2b side in the thickness direction of the light guide plate 2 and a second portion 12B; 14B located on the back surface 2c side. ing.
The first frame portion 14A supports the first reflector portion 12a, and the second frame portion 14B is the second reflector portion 1.
2B is supported. The second portion 12B; 14B is attached to the light guide plate 2, and the first portion 12A; 14A is the light guide plate 2.
And the second portion 12B; 14B is movable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source device used as a light source for back lighting.
This device can be used as, for example, a back lighting unit of a display device such as a sign board or an advertising board.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As a signboard or advertising board, in order to secure the effect of marking or advertising at night or in dark places such as indoors or underground passages, an illumination light source is installed on the back side of the display board carrying the required light-transmissive display image. The one arranged is used. As the illumination light source, a surface light source device in which a plurality of fluorescent lamps are arranged in parallel and a light diffusing plate is arranged in front of the fluorescent lamps, that is, on the side of the display plate was used in the past, but the light emitted from each lamp is used. The influence of the intensity distribution of 1 remains after passing through the light diffusion plate, and the surface light source device becomes thicker. Therefore, a relatively large size used for such purposes (for example, 1m on a side)
As described above), as a surface light source device for a display plate or an advertising plate, a primary light source such as a fluorescent lamp is arranged adjacent to at least one end face (light incident end face) of a light guide plate having the same external dimensions as the display plate, A so-called edge light type surface light source device that introduces light from the primary light source into the light guide body, guides the light, and emits the light from the front surface (light emission surface) of the light guide body is widely used. It has become.

In the edge light type surface light source device, a small number of primary light sources are used, and they are typically arranged at positions corresponding to one side of the rectangular light guide plate or two sides parallel to each other. Therefore, in order to improve the brightness of the surface light source device, it is required to introduce the light emitted from the primary light source into the light guide plate as efficiently as possible. Further, in order to reduce the weight and the cost, a thin light guide plate is gradually used. Therefore, it is important to introduce the light emitted from the primary light source from the end surface of the light guide plate into the light guide plate with the highest possible efficiency. Therefore, place a reflector around the primary light source,
Among the light emitted from the light source, the light other than the light that directly goes to the light incident end surface of the light guide plate is reflected by the reflector and directed toward the light incident end surface.

On the other hand, in the edge light type surface light source device,
As described above, since the number of primary light sources used is relatively small, the failure of any one of the primary light sources has a great influence on the marking and advertisement. In such a case, it is necessary to replace the primary light source, but since the reflector is arranged around the primary light source as described above, this replacement work is very troublesome.

Therefore, it is an object of the present invention to provide an edge light type surface light source device capable of facilitating the replacement work of the primary light source and a display device using the same.

[0006]

According to the present invention, in order to achieve the above object, a light guide plate, a primary light source arranged adjacent to an end face of the light guide plate, and a light source emitted from the primary light source. A reflector disposed around the primary light source so as to reflect the reflected light and guide it to the end surface of the light guide, and the light is emitted from the primary light source and made incident on the light guide plate from the end surface. A surface light source device that emits light from a light emitting surface that is one main surface of the light guide plate, wherein the reflector is located on a light emitting surface side of the light guide plate in a plate thickness direction of the light guide plate. It is divided into a first reflector portion and a second reflector portion located on the side of the back surface which is the main surface opposite to the light emitting surface, and of the first reflector portion and the second reflector portion. At least one of the above Surface light source device characterized in that it is movable relative to the plate, is provided.

In one aspect of the present invention, the primary light source is a straight tube type lamp extending in a direction along both the end surface of the light guide plate facing the primary light source and the light exit surface of the light guide plate. Yes, the reflector extends along the extending direction of the primary light source.

In an aspect of the present invention, a frame body is provided so as to cover the peripheral edge portion of the light guide plate, and the frame body has an interior extending along the peripheral edge portion of the light guide plate. A space is formed, the primary light source and the reflector are arranged in the internal space, and the frame body is located on the light emitting surface side of the light guide plate in the plate thickness direction of the light guide plate. It is divided into a first frame body portion and a second frame body portion located on the back surface side of the light guide plate, and the first frame body portion supports the first reflector portion, The second frame part supports the second reflector part, and at least one of the first frame part and the second frame part is movable with respect to the light guide plate. Has been done.

In one aspect of the present invention, one of the first frame body portion and the second frame body portion is movable with respect to the light guide plate, and the other frame body portion is movable. The one frame body portion of the first frame body portion and the second frame body portion is fixedly arranged with respect to the light guide plate and the primary light source, and the one frame body portion is relative to the other frame body portion. It is supposed to be removable.

In one aspect of the present invention, the first frame portion is provided with a holding means for holding the light transmissive display plate on the light emitting surface of the light guide plate. In one aspect of the present invention, the holding means includes a transparent protective plate that is attached to the first frame body portion and that is arranged in front of the light emitting surface of the light guide plate.

According to the present invention, there is provided a display device including such a surface light source device and the light transmissive display plate held by the holding means. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially omitted front view (a) and side view (b) showing an embodiment of a surface light source device according to the present invention, and FIGS. 2, 3, 4, and 5 are front views thereof, respectively. FIG. 6 is a central vertical sectional view, a partial vertical sectional view, a partial horizontal sectional view and a partially omitted front view, and FIG. 6 is a partially enlarged view of FIG. 5.

In these figures, as best shown in FIGS. 2, 3 and 5, the end faces corresponding to the upper side and the lower side of the light guide plate 2 having a rectangular shape when viewed from the front are shown in FIGS. The primary light source 4 is arranged adjacently. The end surface of the light guide plate 2 facing the primary light source 4 is a light incident end surface 2a, and the front surface, which is one of the two main surfaces, is a light exit surface 2b. A light diffusing plate 6 is arranged on the light emitting surface 2b of the light guide plate 2, and the light reflecting surface member 8 is provided on the back surface 2c which is the other main surface of the two main surfaces of the light guide plate 2. Are arranged. The light guide plate 2 has a thickness of 8 mm, for example.
The transparent acrylic resin plate has a width of about 1480 mm and a height of about 1050 mm. The light diffusing plate 6 is made of, for example, an acrylic resin plate containing light diffusing particles (titanium oxide particles or the like) and having a thickness of about 2 mm. As the light reflecting surface member 8, for example, a member having a structure in which a plastic film having a metal vapor deposition reflecting layer supported by an aluminum light shielding plate is joined with a double-sided adhesive sheet can be used. The primary light source 4 is, for example, a straight tube type such as a fluorescent lamp or a cold cathode tube, and extends in a direction along both the light guide plate light incident end surface 2a and the light guide plate light output surface 2b.

Around the primary light source 4, a reflector 12 is arranged so as to reflect the light emitted from the primary light source and guide it to the light guide end face 2a of the light guide. The reflector 12 extends along the extending direction of the primary light source 4, and the light emitting surface 2 b of the light guide plate 2 extends in the plate thickness direction of the light guide plate 2.
The first reflector portion 12A located on the side of and the second reflector portion 12 located on the side of the back surface 2c of the light guide plate 2.
It is divided into B and. The position of the inner edge of the reflector portion (that is, the edge closer to the light guide plate 2) is not particularly limited, but as in the present embodiment, the inner edge of the first reflector portion 12A. Preferably extends over the edge of the light diffusing plate 6, and the inner edge of the second reflector portion 12B extends over the edge of the light reflecting surface member 8. The lower end edge of the first reflector portion 12A and the lower end edge of the second reflector portion 12B are preferably configured to overlap, for example, in order to prevent light from leaking from the reflector. As the reflector 12, for example, one having a structure in which a plastic film having a metal vapor-deposited reflection layer supported by an aluminum light-shielding plate is joined by a double-sided adhesive sheet can be used.

In the present embodiment, a rectangular annular frame body 14 that covers the peripheral edge of the light guide plate 2 is provided. An internal space 14s extending along the peripheral edge of the light guide plate 2 is formed in the frame body 14, and the primary light source 4 and the reflector 12 are arranged in the internal space 14s. The frame body 14 includes a first frame body portion 14A located on the light emitting surface 2c side of the light guide plate 2 and a second frame located on the back surface 2c side of the light guide plate 2 in the plate thickness direction of the light guide plate 2. It is divided into a body portion 14B. The first frame portion 14A is the first reflector portion 1
2A is supported, and the second frame body portion 14B supports the second reflector portion 12B. First frame part 1
4A includes a supporting portion 18 for supporting a transparent protective plate 16 arranged in front of the light diffusing plate 6 so as to cover the light diffusing plate 6.
Is provided. The transparent protective plate 16 has a thickness of 2 m, for example.
It is made of a transparent acrylic resin plate of about m.

As shown in FIGS. 2 and 5, an engaging recess 14B1 for the upper side portion of the first frame portion 14A is formed at an appropriate position on the upper side portion of the second frame portion 14B. Corresponding to this, the engaging convex portion 14A that engages with the engaging concave portion 14B1 is provided on the upper side portion of the first frame body portion 14A.
1 is formed. Further, an engaging portion 14B2 for engaging with the lower side portion of the first frame body portion 14A is provided at an appropriate position on the lower side portion of the second frame body portion 14B. An engaging portion 14A2 that engages with the engaging portion 14B2 is attached to a lower side portion of the first frame portion 14A, and the first frame portion 14A and the second frame portion 14B are detachably engaged with each other. ing. Engaging portions 14A2, 14B2
For example, a ball catch type engagement mechanism as shown in FIG. 7 can be adopted.

As shown in FIG. 1, the outer dimensions of the frame body 14 are, for example, a width W1 of about 1600 mm, a height H1 of about 1180 mm, and a thickness T of about 40 mm. In addition, the dimensions of the area [effective surface] of the light guide plate light emitting surface 2b not covered by the first frame portion 14 are, for example, a width W2 of about 1460 mm and a height H2 of 1030.
It is about mm.

As shown in FIGS. 5 and 6 showing the state in which the first frame portion 14A is removed, and in particular as shown in FIG.
On the inner surface of the frame body portion 14B, a fixture 14B3 for fixing and supporting the superposed body including the light guide plate 2, the light diffusing plate 6 and the light reflecting surface member 8 and a fixture 14B4 for fixing and supporting the socket of the primary light source 4. Are arranged. In addition, the inner edge of the second reflector portion 12B has the second frame portion 14B.
And the light guide plate 2, the light diffusing plate 6, and the light reflecting surface member 8. That is, the second frame portion 14
B is fixedly arranged with respect to the superposed body including the light guide plate 2, the light diffusion plate 6, and the light reflection surface member 8, the primary light source 4, and the second reflector portion 12.

On the other hand, the inner edge of the first reflector portion 12A is attached to the first frame portion 14A.
Therefore, the first frame body portion 14A and the first reflector portion 12A are integrally formed with the light guide plate 2, the light diffusing plate 6, and the light reflecting surface member 8 as a superposed body, and the second frame body portion 14B.
It is detachable and movable with respect to the second reflector portion 12B.

As shown in FIGS. 4 and 5, the frame 1
A ballast 18 as a device for supplying power to the primary light source 4 and a terminal block 20 are arranged in the internal space 14s of No. 4. These devices are attached to the second frame portion 14B. The second frame portion 14B is formed with a hole 22 through which the power feeding cord is inserted.

As shown in FIGS. 1, 6 and 8,
A lock 24 is attached to the first frame body portion 14A. The lever 24a of the lock 24 is rotatable between two rotating positions forming an angle of 90 degrees in the frame inner space 14s. An engaging member 26 for engaging with the lever 24a in the locking position, which is one of the two rotation positions, to perform the locking.
Are attached to the second frame portion 14B. In the unlocked position, which is the other of the two rotational positions, the lever 2
4a is disengaged from the engaging member 26. Therefore, in this state, the first frame body portion 14A can be separated from the second frame body portion 14B.

FIG. 9 is a partially omitted exploded cross-sectional view for explaining the operation when replacing the primary light source 4 in this embodiment. When replacing the primary light source 4, first, the key is inserted into the lock 24 to unlock, and then the lower side portion of the first frame body portion 14A is pulled forward, whereby the engaging portions 14A2 and 14B2.
In the separated state as shown in the drawing, and further, the engaging convex portion 14A1 is disengaged from the engaging concave portion 14B1 at the upper side portion of the frame body, and the first frame portion 14A and the first reflector portion 12A are separated into the second state. The frame body portion 14B and the portion fixed to the frame body portion 14B are separated and removed. Thus, the first frame portion 14A and the first reflector portion 1
In the state where 2A is removed, the primary light source 4 is exposed at the front half, and therefore can be easily replaced.

In the above surface light source device, the device is used as a display device by utilizing the gap between the light diffusion plate 6 and the transparent protection plate 16 as an area for disposing the light transmissive display plate. It is also possible to use. According to this, by a work similar to the work for replacing the primary light source 4 as described with reference to FIG. 9, a display device in which the light transmissive display plate can be easily replaced is provided. In addition,
In FIG. 9, the light transmissive display plate is indicated by reference numeral 30. That is, FIG. 9 is also an embodiment of a display device using the surface light source device according to the present invention. As the light transmissive display plate 30,
For example, if the display device is a display plate such as a guide display plate or a traffic display plate, the required display content is displayed, and if the display device is an advertising display plate, the required display content is a photograph or the like. It is possible to use a plastic plate-like body, a sheet, a film, or the like which is displayed by a difference in light transmittance and a difference in color.

[0025]

As described above, according to the present invention,
An edge light type surface light source device capable of facilitating the replacement work of the primary light source can be provided. Further, according to the present invention, it is possible to provide a display device capable of facilitating the replacement work of the primary light source and the light transmissive display plate.

[Brief description of drawings]

FIG. 1 is a partially omitted front view (a) and side view (b) showing an embodiment of a surface light source device according to the present invention.

2 is a front center vertical cross-sectional view of the surface light source device of FIG. 1. FIG.

FIG. 3 is a partial vertical cross-sectional view of the surface light source device of FIG.

4 is a partial cross-sectional view of the surface light source device of FIG.

5 is a partially omitted front view of the surface light source device of FIG. 1. FIG.

6 is a partially enlarged view of FIG.

FIG. 7 is a partial view of the surface light source device of FIG.

8 is a partial cross-sectional view of the surface light source device of FIG.

FIG. 9 is an explanatory diagram of an operation of the surface light source device of FIG.

[Explanation of symbols]

2 Light guide plate 2a Light incident end face 2b Light emitting surface 2c back side 4 Primary light source 6 Light diffuser 8 Light reflecting surface member 12 reflector 12A First reflector portion 12B Second reflector portion 14 frame 14A First frame part 14A1 engaging protrusion 14A2 engaging part 14B Second frame part 14B1 engaging recess 14B2 engaging part 14B3 fixture 14B4 fixture 14s internal space 16 Transparent protective plate 16 Transparent protective plate 18 Ballast 20 terminal block 22 Power supply cord insertion hole 24 tablets 24a lever 26 Engagement member 30 Light-transmissive display board

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09F 13/18 G09F 13/18 D // F21Y 103: 00 F21Y 103: 00 F term (reference) 2H091 FA23Z FA41Z FA42Z FB02 LA09 5C096 AA25 BA01 BB41 CA12 CA28 CA32 CB07 CC10 CC17 CD02 CD23 CD53 CE12 CE14 CF09 DA01 DA04 DB05 DB10 EA01 EB13 FA02 FA03

Claims (7)

[Claims] 1. A light guide plate, a primary light source disposed adjacent to an end face of the light guide plate, and the primary light source for reflecting light emitted from the primary light source and guiding the light to an end face of the light guide body. A surface light source device that emits light emitted from the primary light source and incident on the light guide plate from the end surface from a light emission surface that is one main surface of the light guide plate. In the plate thickness direction of the light guide plate, the reflector is provided on the side of the first reflector portion located on the side of the light exit face of the light guide plate and on the side of the back face which is the main face opposite to the light exit face. A second reflector portion which is located,
At least one of the reflector portion and the second reflector portion is movable with respect to the light guide plate. 2. The primary light source is a straight-tube type lamp extending in a direction along both the end surface of the light guide plate and the light exit surface of the light guide plate facing the primary light source, and the reflector is The surface light source device according to claim 1, wherein the surface light source device extends along the extending direction of the primary light source. 3. A frame body is provided so as to cover a peripheral edge portion of the light guide plate, and an internal space extending along the peripheral edge portion of the light guide plate is formed in the frame body. The primary light source and the reflector are arranged in the internal space, and the frame body is a first frame body portion located on the light emitting surface side of the light guide plate in the plate thickness direction of the light guide plate. And a second frame body portion located on the back surface side of the light guide plate, the first frame body portion supporting the first reflector portion, and the second frame body portion. A part supports the second reflector part, and at least one of the first frame part and the second frame part is movable with respect to the light guide plate. The surface light source device according to any one of claims 1 to 2. 4. One of the first frame body portion and the second frame body portion is movable with respect to the light guide plate, and the other frame body portion is the light guide plate and the primary frame. The one frame body portion of the first frame body portion and the second frame body portion is fixedly arranged with respect to the light source, and is removable from the other frame body portion. The surface light source device according to claim 3, wherein: 5. The third frame part according to claim 3, further comprising a holding means for holding a light-transmissive display plate on a light emitting surface of the light guide plate. The surface light source device according to any one of claims. 6. The holding means comprises a transparent protective plate attached to the first frame portion and arranged in front of a light emitting surface of the light guide plate. The surface light source device according to. 7. A display device, comprising: the surface light source device according to claim 5; and the light transmissive display plate held by the holding means.