JP7029159B2 - Heat dissipation structure of waterproof light guide display board - Google Patents

Description

The present invention relates to a heat dissipation structure of a light guide display plate that displays characters and figures on the surface of the light guide plate by injecting illumination light from the side surface side of the light guide plate, and in particular, a waterproof member is provided on the outer peripheral edge of the light guide plate. Regarding the heat dissipation structure of the waterproof light guide display board.

A general configuration of this type of light guide display board is shown in FIG. 5 (a) is an exploded perspective view of the main body of the light guide display plate, (b) is a side sectional view of the assembly of the main body of (a), and (c) is a light guide display plate in which the main body is housed in a case. It is a side sectional view of.
The main body 20 of the light guide plate 2 is a cover 23 having a U-shaped cross section that also serves as a light guide plate 21 formed of a translucent body such as acrylic or glass and a heat radiation plate fitted around the light guide plate 21. And a light emitting body 22 such as a fluorescent lamp or an LED arranged between the bottom of the cover 23 and the side surface of the light guide plate 21. On one surface side of the light guide plate 21 (the lower surface side in the light guide plate 21 of FIG. 5B), a reflector 26 that reflects the illumination light of the light emitter 22 toward the other surface side of the light guide plate 21 and its reflection. An image unit 24 is formed on the surface of the plate 26 or on the one surface of the light guide plate 21 and for displaying characters, figures, and the like on the other surface of the light guide plate 21 by reflection of illumination light. The main body 20 of the light guide display plate 2 having such a configuration is known, for example, as described in Patent Documents 1 and 2.

The light guide display plate 2 is configured by accommodating the main body 20 having the above configuration in a box-shaped case 25. The case 25 has a case body 25a whose front portion on which at least characters and figures are displayed is made of a transparent member such as acrylic, and a back cover that is attached to one side of the case body 25a and seals the case body 25a. It is equipped with 25b. When the light guide display plate is installed outdoors, a packing 25c is provided between the case main body 25a and the back cover 25b in order to prevent water from entering in rainy weather or the like. Such a heat dissipation structure is also well known as described in Patent Documents 3 to 6.

Utility Model Registration No. 3195061 (see Figure 3 in the drawing) Japanese Patent No. 4724872 (see FIG. 2 in the drawing) Japanese Unexamined Patent Publication No. 2000-338908 (see FIG. 7 in the drawing) Japanese Unexamined Patent Publication No. 2007-41622 (see FIG. 3 in the drawing). Japanese Unexamined Patent Publication No. 2007-41622 (see FIG. 3 in the drawing). Utility Model Registration No. 3152614 (see Figure 2 in the drawing) Japanese Unexamined Patent Publication No. 2015-32461 (see paragraph 0042 and FIGS. 1, 3 and 4 of the drawings).

As described above, in the heat dissipation structure described in Patent Documents 3 to 6, since the main body 20 of the light guide display plate 2 is housed in the case 25 larger than that, the display surface of the light guide display plate 2 is relatively large. There is a problem of becoming smaller. In addition, since the configuration is complicated, the price is high, and the ratio of non-decorative surrounding structures to the decorative display surface is relatively large, which is not preferable in terms of the display effect of the signboard. ..
Therefore, the light guide display plate (LED sign panel) 3 described in Patent Document 7 is a light emitting body (LED light emitting body) in the vicinity of the outer peripheral edge of the light guide plate (panel material) 31 as shown in FIGS. 6 (a) and 6 (b). A groove 33 into which the 32 is inserted is formed, and an aluminum plate (heat sink portion) 35 covers the entire back surface of the light guide plate 31. A packing 35c is interposed between the aluminum plate 35 and the light guide plate 31 outside the groove 33 to form a heat dissipation structure. Further, in such a closed heat dissipation structure, heat dissipation of the light emitting body 32 becomes a problem. Therefore, a protrusion-shaped insertion portion 35c is formed in a part of the aluminum plate 35 and comes into contact with the light emitting body 32 in the groove 33. The heat of the light emitter 32 can be dissipated from the aluminum plate 35 to the outside. In the light guide display plate 3 described in this document, an aluminum plate 35 for heat dissipation and waterproofing is also used as a reflector.

However, in recent years, a light guide display plate in which the light guide plate becomes transparent or translucent when non-light emission is becoming widespread, but a light guide plate made of a metal plate such as an aluminum plate like the light guide display plate described in Patent Document 7. If the entire back surface of the light guide plate is covered, the light guide plate cannot be made transparent or translucent, and there is a problem that the light guide plate cannot be applied to such a light guide plate. Further, since the metal plate for heat dissipation is provided on the entire back surface of the light guide plate, there is a problem that the weight of the light guide display plate becomes heavy. There is also the problem that the design of the entire signboard is also limited.

The present invention has been made in view of such a problem, and it is not necessary to cover the entire back surface of the light guide plate with a metal plate having high heat dissipation such as an aluminum plate, and the waterproof property is high while maintaining high heat dissipation. It is an object of the present invention to provide a heat dissipation structure of a waterproof light guide display board which is lightweight, has a wide range of design properties, and can be made transparent or semi-transparent.

In order to solve the above problem, the heat dissipation structure of the waterproof light guide display plate according to claim 1 causes characters and figures to be formed on the surface of the light guide plate by injecting illumination light of a light emitter from the side surface side of the light guide plate. In the heat dissipation structure of the light guide display plate to be displayed, a bottomed light emitting body accommodating groove or a light emitting body accommodating hole formed in the light guide plate and accommodating the light emitting body, and outside the light emitting body accommodating groove or the light emitting body accommodating hole. The sandwiching member and the sandwiching member that prevent water from entering the light emitting body accommodating groove or the luminous body accommodating hole by sandwiching the waterproof member between the waterproof member arranged around the light guide plate and the light guide plate. A bottomed heat radiation groove or heat radiation hole that is formed and communicates with the light emitting body accommodating groove or light emitting body accommodating hole, and a heat radiation member extending from the light emitting body accommodating groove or light emitting body accommodating hole to the heat radiation groove or heat radiation hole. It has an open portion formed by opening a part of the waterproof member in a direction in which moisture does not enter, and has a configuration in which a part or all of the heat radiation groove or the heat radiation hole is communicated with the open portion . As described in claim 2, the bottom of the heat dissipation groove or the heat dissipation hole may be formed thinly to form a heat dissipation portion, and the wall thickness of the heat dissipation portion may be such that the amount of heat generation and the amount of heat dissipation are equal.
The sandwiching member may be made of a waterproof material, and may be made of metal, resin, glass, wood, or a composite thereof. A translucent material made of a transparent or translucent resin or glass is preferable. Further, the sandwiching member may cover only a part of the light guide plate as long as it covers the area surrounded by the waterproof member.
For example, when the waterproof light guide display plate is installed in an upright state, the open portion may be formed by opening a part of the lower portion.
In the above configuration, by communicating a part or all of the heat radiation groove or the heat radiation hole to the open portion, heat can be dissipated from the heat radiation groove or the heat radiation hole to the outside air.

According to this configuration, heat is dissipated through the heat dissipation groove or the bottom of the heat dissipation hole of the holding member, and the heat dissipation structure of the waterproof light guide display plate is formed by the light guide plate, the transparent holding member and the waterproof member. Since it is formed, a case larger than the waterproof light guide display plate is unnecessary, and it is lightweight and can be made transparent or translucent.
Further, as described in claim 3, a heat radiating member such as an aluminum plate having good thermal conductivity may be embedded in a part or all of the bottom of the heat radiating groove or the heat radiating hole.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an exploded perspective view illustrating a configuration of a heat dissipation structure of a waterproof light guide display plate (hereinafter referred to as a light guide display plate) according to the first embodiment of the present invention, and FIG. 2 (a) is FIG. A cross-sectional view of the light guide display plate, (b) is a partially enlarged cross-sectional view showing another embodiment of the heat dissipation portion, (c) is a partially enlarged cross-sectional view showing still another embodiment, and (d) is (c). It is a partially enlarged sectional view which shows the modification.
The light guide display plate 1 includes a light guide plate 11 made of a transparent member such as acrylic, and a fitting groove 17a of a packing 15c which is a waterproof member formed over the entire circumference near the outer peripheral edge of the light guide plate 11. A bottomed light emitting body accommodating groove 13 for accommodating a light emitting body 12 such as an LED formed inside the fitting groove 17a, and a light guide plate 11 with the packing 15c fitted in the fitting groove 17a. It has a holding plate 15 which is held and held by.

In the light guide display plate 1 having such a configuration, as shown in FIG. 2 (a), there is a certain gap between the bottom of the light emitting body accommodating groove 13 and the surface of the light guide plate 11, so the arrow in the figure. As shown by I, the illumination light of the light emitting body 12 can reach the opposite end of the light guide plate 11 through the gap, and the entire light guide plate 11 can be made to emit light.

In this embodiment, the holding plate 15 is formed to have substantially the same size as the light guide plate 11, and is attached to the back surface of the light guide plate 11 by a bolt or the like. The image unit 14 is formed on the surface of the holding plate 15, the surface of the light guide plate 11, or between the holding plate 15 and the light guide plate 11. Further, a reflector 19 may be provided on the back surface of the image unit 14. A fitting groove 17b into which the packing 15c is fitted is formed in a portion of the holding plate 15 corresponding to the fitting groove 17a, and the packing 15c is fitted in the fitting groove 17a and the fitting groove 17b. By attaching the holding plate 15 to the light guide plate 11, a waterproof structure is configured to prevent water from entering the boundary surface between the holding plate 15 and the light guide plate 11.

A bottomed heat dissipation groove 15a is formed inward from the portion of the holding plate 15 corresponding to the light emitting body accommodating groove 13. Then, as shown in FIGS. 1 and 2 (a), a heat radiating member 16 having an L-shaped cross section is provided from the heat radiating groove 15a toward the light emitting body accommodating groove 13. One of the heat radiating plates 16a constituting the heat radiating member 16 is inserted into the light emitting body accommodating groove 13 and comes into contact with the light emitting body 12, and the other heat radiating plate 16b is located near the bottom of the heat radiating groove 15a. The heat recovered from the light emitting body 12 by the heat radiating plate 16a is transferred to the heat radiating plate 16b and radiated to the outside from the bottom of the thin wall of the heat radiating groove 15a.

FIG. 2B is a partially enlarged cross-sectional view showing another embodiment of the heat dissipation portion.
In this embodiment, a heat radiating member 18 which is a second heat radiating member made of metal or the like having excellent thermal conductivity is embedded in the bottom of the heat radiating groove 15a, and the heat of the heat radiating plate 16b is external to the heat radiating member 18. It is designed to dissipate heat to. By bringing the heat radiating plate 16b into close contact with the heat radiating member 18 as shown in the figure, the heat radiating efficiency is increased.
FIG. 2C is a partially enlarged cross-sectional view showing another embodiment of the light guide display plate.
In this embodiment, the edge 11a of the light guide plate 11 is cut diagonally, and the light emitting bodies 12 and 12 are provided on both the front and back sides of the heat sink 16a, and the illumination from one of the light emitting bodies 12 facing outward is provided. The light is reflected by the edge 11a and the edge 1a can be made to emit bright light.
FIG. 2D relates to a modification of the light guide display plate of FIG. 2 (c), in which a groove is formed on the surface of the light guide plate 11 outside the light emitting body accommodating groove 13, and the light shielding member 19 is formed in this groove. It is buried. Further, the tip of one of the heat sinks 16a in the light emitting body accommodating groove 13 extends to the bottom of the light emitting body accommodating groove 13. By doing so, for example, when the other light emitting body 12 facing inward is a monochromatic LED and the other light emitting body 12 facing outward is a multicolor LED, one of the illumination light of the other light emitting body 12 is used. It is possible to prevent the color from being mixed with the illumination light of the light emitting body 12.

FIG. 3 is a partially enlarged cross-sectional view showing still another embodiment of the heat dissipation portion.
In this embodiment, the two light guide plates 11 and 11 are laminated, and the image unit 14 is formed on the boundary surface between the light guide plates 11 and 11. In this embodiment, one light guide plate 11 functions as a holding plate 15 (hence the description as 11 (15) in the figure). Further, a groove having the same shape is formed at the same position of the light guide plates 11 and 11, and this groove constitutes a light emitting body accommodating groove 13 when the light guide plates 11 and 11 are laminated. The light emitting body accommodating groove 13 is accommodated so that the center of the light emitting body 12 is located at the boundary surface of the light guide plates 11 and 11, and images are displayed on both the front and back surfaces of the light guide display plate 1 by the illumination light of the light emitting body 12. I am trying to do it. By forming different image units 14 on the light guide plates 11 and 11, the images displayed on both the front and back surfaces can be made different.
In this embodiment, the heat radiating member 16 is formed in a U-shaped cross section, and the light emitting body 12 is arranged so as to be in contact with the heat radiating plate 16a constituting the U-shaped bottom portion, and the light emitting body 12 is arranged along the bottom portion of the light emitting body accommodating groove 13. A heat sink 16b is arranged. Then, the heat of the light emitting body 12 is dissipated to the outside from the bottom of the light emitting body accommodating groove 13. That is, in this embodiment, the light emitting body accommodating groove 13 functions as a heat radiation groove 15a.

FIG. 4 is a diagram showing still another embodiment of the heat dissipation structure of the light guide display plate.
When the light guide display plate 1 is always installed upright, the lower part of the packing 15c may be opened. FIG. 4A is a front view of the light guide display plate of this embodiment, and FIG. 4B is a side sectional view.
In the light guide display plate 1 of this embodiment, a light emitting body accommodating groove 13 is formed only below the light guide plate 11, and packings 15c are arranged so as to surround both side surfaces thereof and the upper side thereof. A heat radiation groove 15a communicating with the light emitting body accommodating groove 13 is formed by inserting the portion where the packing 15c is open. The heat radiating groove 15a is opened at the lower end of the light guide plate 11, and the heat radiating plate 16b is arranged in the heat radiating groove 15a. Further, a part of the heat radiating plate 16b extends downward from the lower end opening of the light guide plate 11.
According to this configuration, the heat of the light emitting body 12 can be efficiently released to the outside through the heat radiating plate 16b extending from the light guide plate 11 to the outside.

Although preferred embodiments of the present invention have been described, the present invention is not limited to the above description.
For example, in the light guide display plate of the present invention, the reflector 14 is not always necessary, and it can be applied to a transparent light guide display plate without a reflector, which has been spreading in recent years.
Further, although the explanation has been given by taking a rectangular light guide display plate as an example, the heat dissipation structure of the present invention is not limited to a rectangular shape, and can be applied to a light guide display plate having a shape such as a circle, an ellipse, or an indefinite shape.
Not limited to the above description, the material of the holding plate 15 may be made of metal, resin, glass, wood, a composite thereof, or the like, but it is preferably made of a transparent or translucent material. Further, the holding plate 15 may be any as long as it covers the region surrounded by the packing 15c, and may have the same size as the light guide plate 11 or may be smaller than this.

The heat dissipation structure of the present invention can be applied mainly to a light guide display board used outdoors, but is also suitably applied to a light guide display board installed indoors where humidity is high and dew condensation is likely to occur, such as a bathroom or a drying room. Is possible.

It is an exploded perspective view explaining the structure of the heat dissipation structure of the waterproof type light guide display plate (hereinafter referred to as a light guide display plate) according to the first embodiment of the present invention. (A) is a cross-sectional view of the light guide display plate of FIG. 1, (b) is a partially enlarged cross-sectional view showing another embodiment of the heat dissipation portion, and (c) is a partially enlarged cross-sectional view showing still another embodiment. d) is a partially enlarged cross-sectional view showing a modified example of (c). It is a partially enlarged sectional view which shows the other embodiment of a radiating part. It is a figure which shows still another embodiment of the heat dissipation structure of a light guide display board. In the explanatory view of the light guide display plate according to the conventional example of the present invention, (a) is an exploded perspective view of the main body of the light guide display plate, (b) is a side sectional view of the assembly of the main body of (a), (c). ) Is a side sectional view of the light guide display plate in which the main body is housed in the case. The conventional example of the present invention describes the schematic configuration of the light guide display plate (LED sign panel) described in Patent Document 7, (a) is an exploded perspective view thereof, and (b) is a cross-sectional view thereof. ..

1 Light guide display board (waterproof light guide display board)
11 Light guide plate 11a Edge edge 12 Light emitting body 13 Light emitting body accommodating groove 14 Image unit 15 Holding plate 15a Heat dissipation groove 15c Packing (waterproof member)
16 Heat dissipation member 16a, 16b Heat sink 17a Fitting groove 18 Heat dissipation member (second heat dissipation member)
19 Shading member

Claims (3)

In the heat dissipation structure of the light guide display plate that displays characters and figures on the surface of the light guide plate by injecting the illumination light of the light emitting body from the side surface side of the light guide plate.
A bottomed illuminant accommodating groove or illuminant accommodating hole formed in the light guide plate and accommodating the illuminant.
A waterproof member arranged around the outer periphery of the illuminant accommodating groove or the illuminant accommodating hole,
A sandwiching member that prevents water from entering the illuminant accommodating groove or the illuminant accommodating hole by sandwiching the waterproof member with the light guide plate.
A bottomed heat dissipation groove or a heat dissipation hole formed in the sandwiching member and communicating with the light emitting body accommodating groove or the light emitting body accommodating hole.
A heat radiating member extending from the light emitting body accommodating groove or the light emitting body accommodating hole to the heat radiating groove or the radiating hole.
An open portion formed by opening a part of the waterproof member in a direction in which moisture does not enter, and an open portion.
Have,
Communicating a part or all of the heat dissipation groove or the heat dissipation hole to the open portion.
The heat dissipation structure of the waterproof light guide display board is characterized by. 2. Heat dissipation structure of the light guide display board. The heat dissipation structure of the waterproof light guide display plate according to claim 1 or 2 , wherein a heat dissipation member is embedded in a part or all of the bottom of the heat dissipation groove or the heat dissipation hole.

Images