JP4639716B2 - Display lighting device - Google Patents

Description

  The present invention relates to a display lighting device.

Conventionally, as a display illumination device, there are a display lamp and a guide lamp that illuminate a display surface by causing light from a light source to enter a light guide plate disposed on the back surface of the display surface (see Patent Document 1). In this illumination device, a light guide plate and a linear light source arranged along the longitudinal direction of the end portion of the light guide plate are provided in the housing, and light from the light source is incident on the light guide plate to irradiate the display surface. To do. When the display surfaces are provided on both sides, two light guide plates are provided in the housing, and a gap for guiding light is provided between the light guide plates. In addition, by providing a light-shielding part that reflects light on the back surface of the light guide plate in the vicinity of the light source, the light is incident on the end side opposite to the light source of the light guide plate, thereby improving the uniformity of the display surface. .
JP-A-2-94203

  In the said display illuminating device, it displays using the light-guide plate which carried out dot printing or V groove cut on the back surface of the transparent acrylic board. However, since the light from the light source is guided using a transparent acrylic plate having a thickness of about t8 to t10 in order to improve the uniformity of the display surface, there is a problem that the mass is very heavy and the price of the material is high. is there.

  Accordingly, an object of the present invention is to provide a display illumination device capable of improving the overall illuminance (luminance) of the light emitting surface while reducing the weight.

In order to solve the above-mentioned problems, a display lighting device according to claim 1 of the present invention includes a plurality of top plates, which are arranged in a straight line along the lower surface of the top plate, with side plates suspended from both sides of the top plate. A body case having a lamp socket for mounting the straight tube lamp between the side plates on both sides of the top plate, and a reflecting plate, opposite to each other on both sides of the reflecting plate via an air layer, and the upper end surface A display panel having a pair of light guide panels opposed to a straight tube lamp, wherein the reflector and the upper ends of the pair of light guide plates are inserted between the side plates of the main body case;
One of the side plates on both sides of the top plate is composed of a plurality of plates provided so as to face each of the plurality of straight tube lamps, and has an open position and a closed position where the straight tube lamps can be replaced. It is attached to the top plate so as to be rotatable between them, and is attracted to the main body case by a magnet in the closed position, and each of the pair of light guide panels is formed by one panel .

  The display illumination device according to claim 2 is the display illumination device according to claim 1, wherein each of the portions inserted into the main body case of the front-side light guide panel and the rear-side light guide panel is provided. A light shielding part was provided on the outer surface of the panel.

  The display illumination device according to claim 3 is the display illumination device according to claim 1 or 2, wherein a bottom reflector is provided on an end surface of the light guide panel opposite to the light source.

  According to the display lighting device of the first aspect of the present invention, the light guide panel on the front surface side and the light guide panel on the back surface side, the light from the light source on the light guide panel on the front surface side, and the light guide panel on the back surface side Each of the light source side is disposed so as to be introduced from the end surface on the light source side, and a reflection plate having both surfaces formed of a reflection surface is provided between the light guide panel on the front surface side and the light guide panel on the back surface side, and the reflection plate and the surface Since an air layer is formed between the light guide panel on the side and the back side, the light from the light source is converted into light guided into the light guide panel and direct light irradiated between the light guide panel and the reflector. Dividing and combining these direct light and light guide improves the overall illuminance (luminance) of the light emitting surface. In addition, as the direct light is used together, the light guide panel can be made thinner, so the mass becomes lighter, handling such as manufacturing and carrying in becomes easy, workability is improved, and the cost of the material is reduced. Can be planned.

  According to the second aspect of the present invention, since the light shielding portion is provided on the outer surface of each of the portions of the light guide panel on the front surface side and the light guide panel on the back surface side inserted into the main body case, the illuminance on the main body case side is suppressed. be able to. Thereby, the main body case side does not become abnormally bright, and the uniformity of the light guide panel is improved.

  According to the third aspect of the present invention, since the bottom reflector is provided on the end surface of the light guide panel opposite to the light source, the bottom reflector reflects the light back to the light source side to improve the degree of uniformity.

  A display illumination device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a display illumination device according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main part thereof, FIG. 3A is a front view of the display illumination device according to the embodiment of the present invention, and FIG. FIG. 4 is a plan view, FIG. 4C is a side view, and FIG. 4 is a partially broken enlarged view of FIG.

  As shown in FIGS. 3 and 4, this display illumination device supports a main body case 1 in which a lamp (light source) 5 is built, a light guide panel 2 and a milky white panel 3, and these panels 2 and 3. And a frame 4.

  As shown in FIG. 1, the main body case 1 is formed of a steel plate or the like in a substantially groove shape having both side plates 1 a and a top plate 1 b, and surrounds the socket 6, the ballast 16 and the lamp 5 that connect the lamp 5 therein. A reflecting plate 7 is provided. In addition, the mounting bracket 8 for mounting the panels 2 and 3 is disposed so as to sandwich the end edges of the panels 2 and 3. The top plate 1b of the main body case 1 is provided with a power supply hole 9 and a mounting bolt hole 10 for mounting on the ceiling (FIG. 3). Further, one side plate 1a of the main body case 1 is rotatably attached to the top plate 1b by a hinge or the like. Thereby, the main body case 1 can be opened and closed, and one side plate 1a is attracted and fixed to the mounting bracket 8 by the magnet 11 in the closed state. In this case, each of the plurality of lamps 5 has a side plate 1a that can be opened and closed, and the connecting portion 17 is connected with a gap of about 1 mm. The frame 4 is disposed around the panels 2 and 3 except for the edge on the lamp 5 side, and the end frame 4 a disposed on the side of the frame 4 is fixed to the end plate 1 c of the main body case 1.

  As shown in FIG. 2, the light guide panel 2 has a light guide panel 2 a on the surface side provided to accommodate the end edge portion inside the main body case 1, and an end edge portion inside the main body case 1. A back-side light guide panel 2b provided to face the front-side light guide panel 2a at substantially the same interval as the diameter of the lamp 5 is provided. The light guide panel 2 is made of an acrylic plate having a thickness of about 4 mm, and is displayed by dot printing or V-groove cutting. In this case, one light guide panel 2 is provided for the plurality of lamps 5. In addition, ribs 12 made of transparent acrylic protrude from the opposing surfaces of the edge portions of the light guide panel 2a on the front surface side and the light guide panel 2b on the back surface side, thereby ensuring a space between the panels 2a and 2b. . Further, a light shielding portion 13 is provided on the outer surface of each of the portions of the front-side light guide panel 2a and the rear-side light guide panel 2b inserted into the main body case 1. The light shielding portion 13 is formed by black printing or pasting a cutting sheet.

  The light guide panel 2a on the front surface side and the light guide panel 2b on the back surface side introduce light from the lamp 5 from the end surfaces on the lamp 5 side of the light guide panel 2a on the front surface side and the light guide panel 2b on the back surface side. To be arranged. Moreover, the milky white panel 3a is arrange | positioned on the outer side of the light guide panel 2a on the surface side, and the milky white panel 3b is arrange | positioned on the outer side of the light guide panel 2b on the back surface side. The milky white panel 3 is made of an acrylic plate having a thickness of about 3 mm. Further, a reflection plate 14 having both surfaces formed of a reflection surface is provided between the light guide panel 2a on the front surface side and the light guide panel 2b on the back surface side, and the light guide panel 2a on the front surface side and the back surface side. Air layer 15 is formed between 2b. The reflection plate 14 is made of a steel plate coated with highly diffusive powder, and is substantially the same size as the light guide panel 2, and its edge is sandwiched between the pair of ribs 12 of the light guide panels 2 a and 2 b on the front side and the back side. The In addition, light shielding portions 13 are provided on both side surfaces of the portion of the reflecting plate 14 inserted into the main body case 1 in the same manner as the light guide panel 2. In FIG. 2, A is a main body case insertion part, B is a light-shielding part.

  Further, the frame 4 optically covers these panels 2 and 3 by being disposed around the light guide panel 2 and the milky white panel 3 as described above. A bottom reflector 18 is provided on the end surface of the light guide panel 2 opposite to the lamp 5. The bottom reflector 18 is fixed to the frame 4 and is preferably a specular reflector. Thereby, the light of the lamp 5 is regularly reflected, and the leveling is improved.

  At the time of construction, the edge part of the display panel composed of the light guide panel 2, the milky white panel 3, the reflector 14 and the like supported by the frame 4 as described above is inserted into the main body case 1 and fixed with a fixing tool 19 such as a screw. It is fixed integrally to the mounting bracket 8. The fixing work is performed by opening one side plate 1a of the main body case 1. In the lighting state, the light from the lamp 5 is divided into light guided into the light guide panel 2 and direct light applied to the air layer 15 between the light guide panel 2 and the reflecting plate 14. By combining the light guide, the overall illuminance (luminance) of the light emitting surface is improved. Further, this effect is further enhanced by using one light guide panel 2 for the plurality of lamps 5 as in the present embodiment. Here, if the thickness of the light guide panel is 4 mm and there is no air layer, the light guide hardly emits light, and it is necessary to use a light guide panel having a thickness of 8 to 10 mm as in the prior art, resulting in a very heavy mass. In the present embodiment, by reducing the thickness of the light guide panel 2 and providing the air layer 15 as described above, the mass is reduced and the workability is improved. Further, by providing the light shielding portion 13 in the main body case insertion portion A, the illuminance on the main body case 1 side can be suppressed, and the leveling is improved.

  In addition, the thickness of the light guide panel 2 should just be thinner than a prior art. The milky white panel 3 may be omitted.

It is sectional drawing of the illuminating device for a display of embodiment of this invention. It is a principal part enlarged view of FIG. (A) is a front view of the display illuminating device of embodiment of this invention, (b) is a top view, (c) is a side view. FIG. 4 is a partially broken enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 2 Light guide panel 2a Light guide panel 2b on the surface side Light guide panel 5 on the back side Lamp 13 Light-shielding part 14 Reflector 15 Air layer 18 Bottom reflector

Claims (3)

A main body having a top plate and a lamp socket between the side plates on both sides of the top plate, the side plates being suspended on both sides of the top plate, and mounting a plurality of straight tube lamps arranged linearly along the lower surface of the top plate A pair of a light guide panel having a case and a reflecting plate, facing each other through an air layer on both sides of the reflecting plate, and having an upper end surface facing the plurality of straight tube lamps; A display panel having an upper end portion of the light guide plate inserted between the both side plates of the main body case;
One of the side plates on both sides of the top plate is composed of a plurality of plates provided so as to face each of the plurality of straight tube lamps, and has an open position and a closed position where the straight tube lamps can be replaced. A lighting device for display, which is attached to the top plate so as to be rotatable between them, and is attracted to the main body case by a magnet in the closed position, and each of the pair of light guide panels is formed by a single panel .   The display illumination device according to claim 1, wherein a light-shielding portion is provided on an outer surface of each of the portions of the front-side light guide panel and the rear-side light guide panel inserted into the main body case.   The display illumination device according to claim 1, wherein a bottom reflector is provided on an end surface of the light guide panel opposite to the light source.

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