JP2015165261A - Light source unit for light emission information display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source unit for a light emission information display device, which achieves outdoor use with a simple configuration.SOLUTION: A light source part 13 which is a light source unit for a light emission information display device 1 includes one or more LEDs 21 which are mounted on a base plate 31 and which are provided on an end face of a light guide plate 23 in a manner to face the end face. The base plate 31 and the light guide plate 23 are bonded together with an adhesive 29, and the LEDs 21 are sealed by the adhesive 29. The base plate 31, the LEDs 21, and the end face of the light guide plate 23 are integrally bonded to a recess part 43 of a base 25 with the adhesive 29 in a state of being inserted into the recess part 43.

Description

  The present invention relates to a light source device for a light-emitting information display device that displays information by light emitted from the back side.

  There is a light emitting information display device that displays information such as certain images and characters by irradiation of a light source arranged on the back side, such as an advertisement at a station or a guidance display board. As a light source device used for this device, there is one using an LED which is a semiconductor light emitting element (for example, Patent Document 1).

  The light source device described in Patent Document 1 is formed by arranging a plurality of LEDs so as to face a side surface of a light guide plate. The light emitted from the LED enters the light guide plate from the side surface of the light guide plate, is reflected to the front side by the unevenness of the back surface, and is emitted from the surface of the light guide plate.

On the other hand, a technique has been proposed in which an LED is provided on the side surface of a light guide plate without reducing the extraction efficiency of light emitted from the LED (for example, Patent Document 2).
In the technique described in Patent Document 2, the LED assembly formed by sealing the LED mounted on the main surface of the wiring board with a transparent package is guided so that the transparent package fits into the recess formed on the side surface of the light guide plate. It is attached to the light plate.

JP 2005-3734 A JP 2007-19024 A

  The light source described in Patent Document 1 is assumed to be used indoors, is not waterproofed on the LEDs, and is not suitable for outdoor use. On the other hand, although the technique described in Patent Document 2 can be used outdoors because the LED mounted on the wiring board is sealed with a transparent package, the structure is complicated and the cost is increased.

  An object of the present invention is to provide a light source device for a light emitting information display device that can be used outdoors with a simple structure.

  In the light source device for a light emitting information display device according to the present invention, one or more LEDs mounted on a substrate are arranged to face an end surface of a light guide plate, and the substrate and the light guide plate are bonded by an adhesive, The LED is sealed with the adhesive.

  The substrate, the LED, and the end surfaces of the light guide plate are integrally joined to the recessed portion by the adhesive while being inserted into the recessed portion of the base.

  In the light source device for a light emitting information display device according to the present invention, the LED is sealed with an adhesive that bonds the substrate and the light guide plate. For this reason, it can be used outdoors. Further, since the bonding of the substrate and the light guide plate and the sealing of the LED are performed with one adhesive, it can be implemented at a low cost.

It is a perspective view which shows the usage example of the light emission information display apparatus which concerns on 1st Embodiment. It is a schematic perspective view which shows a light source part. It is the figure which looked at sectional drawing in the virtual plane A of FIG. 2 from the arrow direction. It is the figure which looked at the state which inserted the LED module in the recessed part of the base from the side in which LED was mounted. It is sectional drawing in the B section of FIG. It is a figure which shows the light emission information display apparatus which concerns on 2nd Embodiment, (a) is a front view of a light emission information display apparatus, (b) is sectional drawing of a light emission information display apparatus. It is an enlarged view which shows the upper part of the light source part of FIG. It is sectional drawing of the light emission information display apparatus which concerns on 3rd Embodiment.

  Hereinafter, embodiments of a light source device of a light-emitting information display device according to an aspect of the present invention will be described with reference to the drawings.

<First Embodiment>
1. Overall Structure FIG. 1 is a perspective view showing an example of use of a light emitting information display device according to a first embodiment.

  As shown in the figure, the luminescent information display device 1 is attached to the support column 3 using a fixture 5. For example, a Z-bending bracket 7 is used as the fixture 5, and two fixtures 5 are provided on the upper and lower sides. Each Z-bending bracket 7 has one flat portion 7 a fixed to the light emitting information display device 1 and the other flat portion 7 b fixed to the column 3. The fixing is performed by a known fixing method such as a screw or welding.

  The light emission information display device 1 includes an information display unit 11 and a light source unit 13. The information display unit 11 here is constituted by a display sheet 15 on which information such as images and characters are described (printed). The light source unit 13 is a light source device for the light emitting information display device 1 and irradiates the information display unit 11 from the back side.

  In addition to the information display unit 11 and the light source unit 13, the light emission information display device 1 of the present embodiment includes a frame 17 that fixes (holds) the information display unit 11 and the light source unit 13. The Z-curve bracket 7 described above is fixed to the frame 17.

2. Configuration of Each Part (1) Information Display Unit The information display unit 11 is configured by a display sheet 15, for example. The display sheet 15 includes a sheet material and information written on the main surface on the front side of the sheet material. Note that the back surface of the sheet material is the surface facing the light source unit 13. Further, the information is not information that changes the content displayed on the liquid crystal display unit or the like, for example, but information that is constant (fixed).

  The sheet material is a sheet material made of a resin material used for a known signboard or the like. Examples of such a sheet material include vinyl chloride and PET. In order to improve water resistance and light resistance, the sheet material may be surface laminated with PVC or the like after information is described.

  For example, the display sheet 15 may be attached to the light guide plate 23 by glue provided in advance on the back surface of the sheet material, or applied to the main surface of the light guide plate 23 or glue applied to the back surface of the sheet material. It may be attached by glue.

  Actually, the light emitting information display device 1 may be sold in a state where the information display unit 11 is not provided or a sheet material on which information is not described is attached to the light source unit 13. There is also. Therefore, the light emission information display device 1 may not have the information display unit 11.

  In the present embodiment, the display sheet 15 will be described below as being provided on the two main surfaces (the front surface and the back surface) of the light guide plate 23.

(2) Light Source Part FIG. 2 is a schematic perspective view showing the light source part, FIG. 3 is a cross-sectional view of the virtual plane A in FIG. 2 as seen from the direction of the arrow, and FIG. It is the figure which looked at the state which inserted the LED module in the insertion part from the side in which LED is mounted, and FIG. 5 is sectional drawing in the B section of FIG.

  The light source unit 13 includes an LED 21, a light guide plate 23, bases 25 and 27, and an adhesive 29. In the light source unit 13, a portion including the end surface of the light guide plate 23 is inserted into the recessed portion 43 of the base 25 so that the end surface of the light guide plate 23 and the LED 21 are in contact with or close to each other. An adhesive 29 is disposed between the portion 43 and the end face of the light guide plate 23.

Hereinafter, each part will be described.
(2-1) LED
The LED 21 emits a desired light color. For example, a translucent resin material containing a phosphor that converts the wavelength of blue light into yellow light is applied to a bare chip that emits blue light, and the blue light and the yellow light are mixed together. Emits white light. Here, an LED is formed by applying a translucent resin material to a bare chip.

  There are a plurality of LEDs 21. The plurality of LEDs 21 are mounted in a row on a substrate 31 as shown in FIGS. 4 and 5. The LED 21 here is supplied as an LED module 33 mounted on the substrate 31.

  The substrate 31 has a shape corresponding to one side surface of the light guide plate 23, here, a side surface (also an upper end surface) located at the upper end of the light guide plate 23. Specifically, when the board | substrate 31 is seen from the side which mounts LED21 (refer FIG. 4), it has an elongate shape. As shown in FIG. 3, the width of the substrate 31 is equal to or less than the thickness of the light guide plate 23 to which the display sheet 15 is attached (including the thickness of the display sheet 15).

  The substrate 31 has an insulating plate and a wiring pattern on one main surface (surface on which the LED 21 is mounted) of the insulating plate. The insulating plate is made of, for example, a glass epoxy plate, a ceramic material, a resin material, or the like.

  As shown in FIG. 4, the wiring pattern is, for example, a connection pattern 35 and a terminal pattern 37. The connection pattern 35 is a conductive path for electrically connecting a plurality of mounted LEDs 21 in a predetermined connection form, for example, in series connection. The terminal pattern 37 is a conductive land for connecting a cable 39 connected to a power source (not shown) and the connection pattern 35. The connection between the terminal pattern 37 and the cable 39 is made by, for example, solder 41.

  The LED 21 is a so-called bottom electrode type having electrode terminals on the surface on the substrate 31 side. For example, the LED 21 is mounted on the connection pattern 35 of the substrate 31 by using a bump chip or the like.

Here, in the LED 21, a surface parallel to the light emitting layer and located on the side opposite to the side on which the substrate 31 exists is defined as a surface, and light is mainly emitted from the surface.
(2-2) Light guide plate

  The light guide plate 23 is formed by mixing diffusing particles in a translucent resin material. Examples of the diffusing particles include silicone particles, silica, zirconia, and dielectric polymer. Examples of the translucent resin material include polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polypropylene (PP), and polycarbonate (PC).

  Here, the light guide plate 23 has a rectangular shape. One of the side surfaces (end surfaces) of the light guide plate 23, here, the upper end surface is an incident surface for light emitted from the LED 21. The light incident from the incident surface is guided through the light guide plate 23 and emitted from the rear surface. That is, the incident light changes its traveling direction to the front side or the back side by the diffusing particles in the light guide plate 23. Note that the two main surfaces of the light guide plate 23, ie, the front surface and the back surface, are light output surfaces.

  As shown in FIG. 3, the upper end surface of the light guide plate 23 is attached to a base 25 described later in a state in contact with the surface of the LED 21 or in a state close to the surface of the LED 21.

  In addition, although it is not the structure of the light-guide plate 23, as mentioned above, the display sheet 15 may be provided in the surface and back surface of the light-guide plate 23, and does not need to be provided. Here, the display sheet 15 is attached to the front and back surfaces of the light guide plate 23.

(2-3) Base As shown in FIGS. 2 and 3, the bases 25 and 27 are provided at the upper and lower ends of the light guide plate 23 with the display sheet 15 attached to the front and back in the present embodiment. That is, there are an upper base 25 attached to the upper end of the light guide plate 23 and lower bases 27 a and 27 b attached to the lower end of the light guide plate 23. Hereinafter, when the upper base 25 and the lower bases 27a and 27b are described without distinction, the two are collectively referred to as the upper and lower bases 25 and 27.

  The upper and lower bases 25 and 27 have recessed portions 43. Specifically, the upper and lower bases 25 and 27 are formed of a long member, and the recessed portion 43 extends in a groove shape along the long longitudinal direction.

  The recessed portion 43 of the upper base 25 has a width and a depth that can accommodate at least the LED module 33 therein. The width here is a dimension in a direction perpendicular to the extending direction of the recessed portion 43.

  Moreover, as shown in FIG.2 and FIG.3, the width | variety of the recessed part 43 of the upper and lower bases 25 and 27 is larger than the thickness of the up-and-down edge part of the light-guide plate 23 to which the display sheet 15 is affixed.

  Here, since the cross-sectional shape of the substrate 31 of the LED module 33 is rectangular as shown in FIG. 3, the cross-sectional shape of the recessed portion 43 is also rectangular. Specifically, the upper and lower bases 25 and 27 are constituted by so-called channel members having a cross-sectional shape of “U”.

  For example, a metal material or a resin material is used as the material of the upper and lower bases 25 and 27. When a metal material is used, aluminum is preferable in consideration of lightness, and stainless steel is preferable in consideration of water resistance and the like.

  The upper and lower bases 25 and 27 are light guide plates with an adhesive 29 described later in a state where the upper end portion and the lower end portion of the light guide plate 23 with the display sheet 15 attached thereto are inserted into the respective recessed portions 43. 23 is fixed. Thereby, it can prevent that the display sheet 15 peels from the light-guide plate 23. FIG.

  The lower bases 27 a and 27 b are shorter than the lateral length at the lower end of the light guide plate 23, and are provided at two locations on the lower end portion of the light guide plate 23.

(2-4) Adhesive The adhesive 29 has a function of sealing a mounting portion between the LED 21 and the substrate 31 as shown in FIG. As shown in FIGS. 4 and 5, the adhesive 29 has a function of sealing an electrical connection portion between the terminal pattern 37 of the substrate 31 and the cable 39. Therefore, the adhesive 29 is made of an insulating resin material.

  As shown in FIG. 3, the adhesive 29 has a function of accommodating and fixing the LED module 33 in the recessed portion 43 of the upper base 25. The adhesive 29 also has a function of fixing the substrate 31, the upper base 25, and the upper end portion of the light guide plate 23.

  Specifically, the adhesive 29 covers the LED 21 existing between the substrate 31 and the end face of the light guide plate 23 while being bonded. At this time, the mounting portion between the LED 21 and the substrate 31 and the electrical connection portion between the terminal pattern of the substrate 31 and the cable 39 are covered.

Moreover, when LED21 and the end surface of the light-guide plate 23 are adjoining, the adhesive agent 29 will interpose between both. For this reason, a translucent material is used as the adhesive 29.
Further, the bonding between the recessed portion 43 and the substrate 31 and the bonding between the recessed portion 43 and the light guide plate 23 are performed by one adhesive 29.

(2-5) Assembly of the light source unit The light source unit 13 is assembled by first preparing the LED module 33, the upper and lower bases 25 and 27, and the light guide plate 23 to which the display sheet 15 is attached, and the LED module 33. Is disposed in the recessed portion 43 of the upper base 25, the step of supplying the resin for the adhesive 29 into the recessed portion 43 of the upper base 25, and the upper end portion of the light guide plate 23 is recessed in the upper base 25. This is mainly performed in the step of inserting into the insertion portion 43.

  The LED module 33 is prepared by mounting the LED 21 on the substrate 31 and connecting the cable 39 to the terminal pattern 37 of the substrate 31. Note that the case where the LED module 33 is assembled from the substrate 31, the LED 21, and the cable 39 is included in the preparation.

  When the LED module 33 is disposed in the recessed portion 43 of the upper base 25, the substrate 31 is brought into contact with the bottom surface of the upper base 25. That is, the LED module 33 is disposed in the recessed portion 43 so that the surface of the LED 21 faces the opening of the recessed portion 43 of the upper base 25.

  At this time, since the wiring pattern of the substrate 31 is located on the opening side of the upper base 25, even if a metal material is used as the material of the upper base 25, it is significant in measures against insulation. For this reason, an inexpensive substrate having a wiring pattern exposed on the main surface can be used as the substrate.

  Moreover, since the width | variety of the board | substrate 31 is smaller than the width | variety of the recessed part 43, arrangement | positioning of the LED module 33 can be performed easily. At this time, if the width of the substrate 31 is substantially the same as the width of the recessed portion 43, the positioning of the substrate 31 can be performed with high accuracy, and if the width difference is large, the adhesive 29 can easily go around the back side of the substrate 3. .

  The step of supplying the resin for the adhesive 29 into the recessed portion 43 of the upper base 25 may be after the LED module 33 is disposed in the recessed portion 43 of the upper base 25 or before the LED module 33 is disposed. However, the supply amount is such that when the upper end portion of the light guide plate 23 is inserted, no gap is generated between the recessed portion 43 and the light guide plate 23 due to insufficient adhesive.

  Regardless of the timing of the placement (installation) of the LED module 33 in the recessed portion 43 and the supply of the resin for the adhesive 29, the LED module 33 is finally filled with the resin for the adhesive 29. become.

  Therefore, the mounting portion (electrically connected portion) between the LED 21 and the substrate 31, the electrically connected portion between the substrate 31 and the cable 39, and the wiring pattern are covered with the adhesive 29. As a result, the exposed conductive portion of the LED module 33 is sealed, and the outdoor light-emitting information display device 1 can be used as a light source device.

  The light guide plate 23 is inserted into the recessed portion 43 until the end surface on the side to be inserted into the recessed portion 43, that is, the upper end surface is in contact with the surface of the LED 21. Originally, since the upper end surface of the light guide plate 23 and the surface of the LED 21 are designed to be in contact with each other, there is no need to grasp (adjust) the amount of insertion of the light guide plate 23 and the position of the light guide plate 23 with respect to the LED 21 can be easily achieved. Can be combined. In addition, since the light emitting surface of the LED 21 and the light incident surface of the light guide plate 23 are in contact with or close to each other, the light emitted from the LED 21 efficiently enters the light guide plate 23.

  Further, since the substrate 31 is pushed toward the bottom surface of the upper base 25 when the light guide plate 23 is inserted into the recessed portion 43, the contact area between the substrate 31 and the bottom surface of the upper base 25 can be increased. Thereby, heat at the time of light emission of the LED 21 is transmitted to the upper base 25 through the substrate 31.

  As described above, the light source unit 13 has the adhesive 29 (or resin for the adhesive 29) disposed in the recessed portion 43 in a state where the LED module 33 is inserted into the recessed portion 43 of the upper base 25 ( Then, the light source unit 13 can be assembled and the LED 21 can be waterproofed by a simple process of inserting the upper end of the light guide plate 23 into the recessed portion 43.

  The lower bases 27a and 27b also supply the resin for the adhesive 29 to the recessed portions 43 of the lower bases 27a and 27b in the same manner as the upper base 25, and then the lower end of the light guide plate 23 is inserted into the recessed portions 43. As a result, the light guide plate 23 is fixed.

(3) Frame As shown in FIG. 1, the frame 17 supports the periphery of the light guide plate 23. The entire shape of the frame 17 is the light source unit 13 when the light guide plate 25 is viewed from a direction orthogonal to the main surface of the light guide plate 23 of the light source unit 13 (when viewed from this direction, it is a front view). It has a frame shape corresponding to the external shape.

  The frame 17 includes a frame main body 51 having three side portions and one side portion 53 that is detachably attached to the frame main body 51. Here, the front view shape of the light source unit 13 is a vertically long rectangle as shown in FIG. For this reason, the overall shape of the frame 17 in a front view is a vertically long rectangular frame.

  The frame main body 51 and the side part 53 have a cylindrical shape with a rectangular cross section, and have a groove 54 along the central axis of the cylindrical part.

  The frame main body 51 is connected to the upper horizontal portion 55 arranged in the upper portion and horizontally, the lower horizontal portion 57 arranged in the lower portion and horizontally, and one ends of the upper horizontal portion 55 and the lower horizontal portion 57 connected to each other. And a vertical portion 59 arranged vertically.

  The upper horizontal portion 55 and the lower horizontal portion 57 have a space in which the upper and lower bases 25 and 27 of the light source unit 13 are housed, and the width of the groove 54 recessed from the inner peripheral wall into the inner portion is guided. The size of the optical plate 23 (including the display sheet 15) is allowed.

  That is, the upper and lower bases 25 and 27 of the light source unit 13 are arranged from the other side of the upper horizontal part 55 and the lower horizontal part 57 of the frame body 51 (the side opposite to the side where the vertical part 59 exists). The light source unit 13 is incorporated into the frame body 51 by being inserted into the interior and sliding the light source unit 13 toward one end.

  The vertical portion 59 also has grooves 54 that are continuous with the grooves 54 of the upper and lower horizontal portions 55 and 57 at the upper and lower ends and extend in the vertical direction. The light guide plate 23 (including the display sheet 15) is inserted into the groove 54.

  The side portion 53 has a groove 61 extending in the vertical direction, like the vertical portion 59 of the frame body 51. The side portion 53 is attached to the frame main body 51 in a state where the light guide plate 23 of the light source unit 13 inserted into the frame main body 51 and the groove 61 are fitted, and the upper and lower ends of the side portion 53 are the frame main body 51. The other ends of the upper and lower horizontal portions 55 and 57 are fixed by a screw member 63.

  The side portion 53 is provided with a through hole through which the cable 39 electrically connected to the LED module 33 passes.

<Second Embodiment>
In the first embodiment, the display sheet 15 is attached to the front and back surfaces of the light guide plate 23 of the light source unit 13. However, the information display unit 11 may be other than the display sheet 15 and may not be attached to the light guide plate 23.

  In the second embodiment, a light emission information display device in which the information display unit is configured by a display panel and the display panel is provided on the side of the housing that houses the light source unit will be described.

  6A and 6B are diagrams showing a light emission information display device according to the second embodiment, wherein FIG. 6A is a front view of the light emission information display device, and FIG. 6B is a cross-sectional view of the light emission information display device. FIG. 7 is an enlarged view of the upper portion of the light source section.

1. Overall Configuration The light emitting information display device 101 includes a display panel (information display unit) 103 and a light source unit 105 as shown in FIG. The display panel 103 is provided in the housing 107, and the light source unit 105 is stored in the housing 107. The casing 107 is attached to a column or the like outside the figure by various known fixing methods via various attachments (not shown).

  The light emitting information display device 101 is irradiated with information on the display panel 103 from the back side by light emitted from the internal light source unit 105. The light source unit 105 is a light source device for the light emitting information display device 101.

2. Configuration of Each Part (1) Display Panel The display panel 103 which is an information display unit includes a translucent plate 111 made of a translucent resin material and information 113 written on the front or back surface of the translucent plate 111. As the translucent plate 111, for example, an acrylic resin, a PET resin, or the like can be used.

  The translucent plate 111 is preferably made of a resin material having excellent water resistance and light resistance in consideration of outdoor use.

  The display panel 103 is attached to the back surface of the peripheral part of windows 143 and 147 of the casing 107 described later so as to face the light guide plate 123 of the light source unit 105.

(2) Light Source Unit The light source unit 105 includes an LED 121 and a light guide plate 123 as shown in FIG. Similarly to the light source unit 13 in the first embodiment, the light source unit 105 includes an upper base 125 for coupling the LED 121 and the light guide plate 123, and these are integrally coupled by an adhesive 127.

  There are a plurality of LEDs 121 and they are supplied as LED modules 132 mounted on a substrate 129.

  The light source unit 105 has the same structure as that of the light source unit 13 of the first embodiment, and is assembled by the same method. For this reason, the description of the structure and assembly method of the light source unit 105 is omitted.

(3) Housing As shown in FIG. 6, the housing 107 is a box type and has a structure having windows 147 and 143 for the display panel 103 on the front plate 145 and the back plate 141.

  The housing 107 has a box body 131 and a lid 133. The lid 133 is attached to the box body 131 through a hinge 135 or a hinge so as to be freely opened and closed, and the opening and closing of the lid 133 is locked to the box body 131 by a fastener 137 or a patch lock.

  Windows 143 and 147 are provided on the back plate 141 of the box body 131 and the front plate 145 of the lid 133 so that the information 113 of the display panel 103 is exposed. The casing 107 includes a panel fixing unit 151 that fixes the two display panels 103 on the front and back sides and a light source fixing unit 153 that fixes the light source unit 105.

  The panel fixing means 151 is not particularly limited as long as the display panel 103 can be detachably fixed. Here, the panel fixing means 151 includes a spacer 152 fixed to the inner surface of the back plate 141 and the inner surface of the front plate 145 and a pressing plate 155 for pressing the display panel 103 from the inside. The pressing plate 155 is a spacer by a screw 157. It is being fixed to 152.

  The light source fixing means 153 only needs to be able to detachably fix the light source unit 105, and the configuration thereof is not particularly limited. Here, the light source fixing means 153 includes a stepped block 163 fixed to the inner surface of the upper plate 161 and the lower plate of the box body 131, and a pressing plate 165 for pressing the light source unit 105 fitted in the step of the stepped block 163. The holding plate 165 is fixed to the stepped block 163 by screws 167.

<Third Embodiment>
In the first and second embodiments, light is emitted from the front and back surfaces of the light guide plates 23 and 123 of the light source units 13 and 105. However, the light source unit is one main surface of the light guide plate (for example, the front surface). You may make it radiate | emit only from.

  In the third embodiment, a light-emitting information display device including a light source unit that emits light from the surface of a light guide plate will be described.

FIG. 8 is a cross-sectional view of the light emitting information display device according to the third embodiment.
As shown in FIG. 8, the light-emitting information display device 201 includes a display panel (information display unit) 203, a light source unit 205, and a lid unit 207. The light source unit 205 is a light source device of the light emission information display device 201.

  The display panel 203 as an information display unit has the same configuration as that of the information display unit 103 according to the second embodiment, and includes a translucent plate and information described on the back surface of the translucent plate.

  The light source unit 205 includes an LED 211 and a light guide plate 213. Similar to the LEDs 21 and 121 according to the first and second embodiments, there are a plurality of LEDs 211, and the LED module 217 mounted on the substrate 215 in a plurality of rows (here, two rows, but not shown in the drawing). Supplied as

  Here, the lower surface of the light guide plate 213 is an incident surface for light emitted from the LED 211. That is, the lower end surface of the light guide plate 213 is in contact with or close to the surface of the LED 211.

  In the third embodiment, in order to emit light from the surface of the light guide plate 213, a reflective member (for example, a reflective sheet) 221 is provided in close contact with the back surface of the light guide plate 213. As the reflection sheet, for example, a polyester sheet or a PET sheet can be used.

  The light guide plate 213 according to the present embodiment is substantially composed only of a translucent resin material. In the light guide plates 23 and 123 according to the first and second embodiments, diffusion particles are mixed in a translucent resin material.

  For this reason, the back surface of the light guide plate 213 of the third embodiment has an uneven surface 213a in order to change the direction of light incident from the incident surface which is the lower end surface. The uneven surface 213a is formed by, for example, laser processing or printing processing.

  A diffusion member 223 for diffusing light emitted from the surface is provided on the surface of the light guide plate 213. Examples of the diffusion member 223 include a diffusion sheet and a diffusion plate. Note that when the demand for uniform light is low, the diffusion member 223 may not be provided.

  The light source unit 205 includes a base 225 that stores the LED module 217, the light guide plate 213, the reflection member 221, and the diffusion member 223. The base 225 is made of a metal material. The base 225 has a (semi) box shape and has a recessed portion 227. The recessed portion 227 serves as a housing portion for the LED module 217, the light guide plate 213, the reflecting member 221, and the diffusing member 223.

  The recessed portion 227 has such a size that the reflecting member 221, the light guide plate 213, and the diffusing member 223 are overlapped with each other and the LED module 217 is provided so that the LED 211 is in contact with the lower end surface of the light guide plate 213. .

  The depth of the recessed portion 227 is larger than the dimension (thickness) in which the reflecting member 221, the light guide plate 213, and the diffusing member 223 are overlapped.

  In the third embodiment, the display panel 203 is accommodated in the recessed portion 227 of the base 225. For this reason, the depth of the recessed portion 227 is equal to or greater than the dimension (thickness) in which the reflecting member 221, the light guide plate 213, the diffusing member 223, and the display panel 203 are stacked.

  When the inner surface of the base 225 has a reflecting function, for example, a reflecting member may be unnecessary. The reflection function can be implemented, for example, by applying a mirror finish to the inner surface of a metal material and applying a reflective film with a resin material.

  The adhesive 229 is disposed in the recessed portion 227 of the base 225. The adhesive 229 is a bond between the back surface of the reflection member 221 and the bottom surface of the base 225, a bond between the end surfaces of the reflection member 221, the light guide plate 213, and the diffusion member 223 and the inner peripheral surface (excluding the bottom surface) of the base 225, and an LED module. 217, the lower end surface of the light guide plate 213, and the inner surface of the base 225, which has a bonding function to the lower surface.

  The adhesive 229 also has a sealing (covering) function for covering the electrical connection portion between the LED 211 and the substrate 215 (connection pattern), the electrical connection portion between the wiring and the substrate 215 (terminal pattern), and the wiring pattern of the substrate 215. .

  When the opening of the base 225 is arranged upward, the upper surface of the adhesive 229 is higher than the upper surface of the light guide plate 213 and lower than the upper surface of the diffusion member 223. Thereby, it can prevent that the adhesive agent 229 and the display panel 203 contact and interfere.

  The lid portion 207 has a (semi) box shape and has a window 233 on the front plate 231 so that information on the display panel 203 is exposed to the outside. The display panel 203 is larger than the size of the window 233 of the lid 207 in front view. Thereby, it is possible to prevent the display panel 203 from being detached from the lid 205.

  The lid body 207 is detachably attached to the base 225 so as to cover the opening end of the base 225. The method for detachably mounting is not particularly limited, and a known mounting method can be used. Here, the buckle 235 is used using the engagement method.

<Modification>
1. LED
In each embodiment, the emitted light of the LED is white, but other light colors may be emitted depending on the purpose. Further, the plurality of LEDs are arranged in one or two rows, but may be arranged in other forms, for example, in three or more rows, and there is no particular limitation on the arrangement and arrangement of the LEDs.

  In the embodiment, the plurality of LEDs are mounted on one substrate, but may be mounted on a plurality of substrates, for example.

  Moreover, LED should just be a type mounted in the connection pattern on a board | substrate, a bare chip or SMD may be sufficient and the type is not specifically limited.

2. Light Guide Plate In each embodiment, the light guide plate has one light incident surface, but may have a plurality of light incident surfaces. For example, the LEDs may be disposed opposite to the upper and lower end faces of the light guide plate. Further, for example, an LED arranged opposite to the upper end surface emits a first light color, and an LED arranged opposite to the lower end surface emits a second light color different from the first light color. Good.

  The present invention is useful for a light source device for a light emitting information display device that is also used outdoors.

DESCRIPTION OF SYMBOLS 1 Light emission information display apparatus 13 Light source part (light source device)
21 LED
23 Light guide plate 25 Upper base (base)
29 Adhesive 31 Substrate 43 Recessed part

Claims (2)

In a light source device for a light-emitting information display device in which one or more LEDs mounted on a substrate are arranged to face an end face of a light guide plate,
The light source device for a light-emitting information display device, wherein the substrate and the light guide plate are bonded with an adhesive, and the LED is sealed with the adhesive. 2. The light emitting information display device according to claim 1, wherein end surfaces of the substrate, the LED, and the light guide plate are integrally coupled to the recessed portion by the adhesive while being inserted into the recessed portion of the base. Light source device.

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