JP2012108446A - Planar light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planar light-emitting device which is applicable to various displays, menu boars, signs, and signboards such as a store front display requiring frequent changes of display information and is low in cost.SOLUTION: The planar light-emitting device includes: a light source 4; a frame 6 housing the light source 4; a light guide member 8 which has one end part disposed in the frame 6 and guides light incident on an end surface in the one end part toward the other end surface; and a light diffusion member 10 disposed opposite the light diffusion member 8 so as to cover one principal surface of the light guide member 8. The light diffusion member 10 is disposed so as to be freely brought into contact with and separated from the light guide member 8. When force is applied to the light diffusion member 10 from the outside in a state where the light diffusion member 10 is in close contact with the light guide member 8, a portion to which the force has been applied becomes an optical path for light, and a part of light passing through the light guide member 8 leaks to a surface of the light diffusion member 10 to display information. On the other hand, information of light emitted from the surface of the light diffusion member 10 disappears when the close contact state between the light diffusion member 10 and the light guide member 8 is released.

Description

  The present invention relates to a planar light emitting device, and more particularly to a planar light emitting device capable of displaying information by light on a pressed display surface by applying an external force to the display surface.

Conventionally, for example, various modes are known as means for emitting light on the entire surface or a part of the surface using a point-like or straight-tube light source.
For example, when emitting a surface by the edge light method, the light emitted from the light source is incident from the side surface of the light guide plate, and the light passes through the light guide plate.
1) Print the reflection pattern by screen printing etc.
2) Machine the surface of the light guide plate,
3) Shape the pattern by thermoforming,
4) A method of emitting light at a desired portion by mixing and diffusing particles having different refractive indexes inside a resin is known (Patent Document 1).

  When displaying a character, a picture, or the like on the display surface with such a planar light emitting device, prepare a film or cover on which desired information is printed in advance, and attach the film or cover to the display surface of the planar light emitting device. In general, the display has been made to be embedded, or a character or a picture is directly inserted to transmit light from the back side.

  However, in such a planar light emitting device, when information such as characters or pictures to be displayed is changed, it is necessary to change a film, a cover, a processed pattern, or the like. In that case, there is a problem that a new one cannot be prepared in a short time.

  Also, such a planar light emitting device is not suitable for use in displays, signs, signboards, etc. in stores where there are many changes in information, and cannot meet the requirements.

JP-A-10-339815

  The present invention can be applied to various displays such as displays in stores, menu boards, signs, signboards, etc., which require frequent changes in information to be displayed, in view of such conventional situations, and is cost effective. Another object of the present invention is to provide an inexpensive planar light emitting device.

To achieve the above object, a planar light emitting device according to the present invention comprises:
A light guide member that guides the light incident on the fore edge face of the one end where the light source is disposed, to the other fore edge face side;
A light diffusing member disposed so as to cover one main surface of the light guide member,
The light diffusing member is disposed so as to be able to contact with and separate from the light guide member,
When a force is applied from the outside to the light diffusing member or the light guide member in a state where the light diffusing member is in close contact with the light guide member, a portion where the force is applied becomes an optical path of light, While a part of the light passing through the light guide member leaks to the surface of the light diffusing member and displays information,
When the close contact state between the light diffusing member and the light guide member is released, information consisting of light emitted from the surface of the light diffusing member is lost.

The present invention also provides:
A light reflecting member is integrally disposed so as to cover the other main surface of the light guide member,
When a force is applied from the outside to the light reflecting member or the light diffusing member in a state where the light diffusing member is in close contact with the light guide member, a portion where the force is applied is an optical path of light. And the light passing through the light guide member leaks to the surface of the light diffusion member and displays information,
When the close contact state between the light diffusing member and the light guide member is released, information composed of light emitted from the surface of the light diffusing member is lost.

  According to the present invention having such a configuration, even when information to be displayed is changed, it is possible to immediately cope with the change of the information. In addition, it is not necessary to prepare new members separately.

The present invention also provides:
A light guide member that guides the light incident on the fore edge face of the one end where the light source is disposed, to the other fore edge face side;
A light reflecting member disposed opposite to cover one main surface of the light guide member,
The light reflecting member is disposed so as to be freely contacted and separated from the light guide member;
When a force is applied from the outside to the light reflection member or the light guide member in a state where the light reflection member is in close contact with the light guide member, a portion where the force is applied becomes an optical path of light, While a part of the light passing through the light guide member leaks to the surface of the light guide member and displays information,
When the contact state between the reflecting member and the light guide member is released and separated, information consisting of light emitted from the surface of the light guide member is lost.

  According to the present invention having such a configuration, even when information to be displayed is changed, it is possible to immediately cope with the change of the information. In addition, it is not necessary to prepare new members separately.

Here, it is preferable that the surface of the light diffusion member facing the light guide member is formed in a mirror shape.
With such a configuration, the adhesion between the light diffusing member and the light guide member is improved, and as a result, the display of information including light such as a pressed character or a picture can be clarified. .

In the present invention, it is preferable that a protrusion is formed on the surface of the light diffusing member opposite to the surface facing the light guide member.
If the protrusions are formed in this way, it is possible to emit more intense information such as characters and pictures.

  Furthermore, in the present invention, when the light diffusing member is arranged so as to be able to contact with and separate from the light guide member and the light reflecting member is arranged on the other surface of the light guiding member, the light guiding member of the light reflecting member is arranged. It is preferable that a protrusion is formed on the surface facing the optical member.

With such a configuration, the intensity of light increases, and as a result, information including light, such as letters and pictures, can be emitted more clearly and strongly.
And in this invention, when the said light reflection member is arrange | positioned so that contact / separation with the said light guide member is possible, the surface facing the said light guide member of the said light reflection member is formed in the mirror surface shape. Is preferred.

With such a configuration, the adhesion between the light reflecting member and the light guide member is improved, and as a result, the display of information made up of light, such as letters and pictures, is made clear when pressed. Can do.
Furthermore, in this invention, it is preferable to provide the flame | frame in which the said light source is accommodated and the one end part of the said light guide member is arrange | positioned.

With such a configuration, light can be efficiently guided from the light source to the light guide member, or the planar light emitting device of the present invention can be set up and handled easily.
And in this invention, while comprising the said light source from the several light source element of a different color, you may form the slit in the said light guide member corresponded to the boundary of the length area | region of these light source elements. .

  With such a configuration, a plurality of different colors can be divided and displayed on the light guide member, and various colors can be combined with the planar light emitting device.

  According to the planar light emitting device according to the present invention, even when information to be displayed is changed, it is possible to immediately cope with the change of the information. Moreover, since it is not necessary to prepare a new member separately, the cost is low.

  Furthermore, it can be used not only as a display device at a store or the like, but also as a display device or a toy at an educational site.

FIG. 1 is a schematic exploded perspective view of a planar light emitting device according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view in the AA line direction of FIG. FIG. 3 is a schematic front view when the menu is displayed using the surface-emitting display device of FIG. 1 as a store signboard. FIG. 4 is a view corresponding to FIG. 1 showing a planar light emitting device according to another embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view in the AA line direction of FIG. FIG. 6 is a view corresponding to FIG. 2 showing a surface light emitting device according to another embodiment of the present invention. FIG. 7 is a view corresponding to FIG. 1 showing a planar light emitting device according to still another embodiment of the present invention. FIGS. 8A and 8B show another embodiment of the present invention. For example, the light source of the planar light emitting device of FIG. 1 has a plurality of light source elements having different colors. It is the schematic front view and side view of the planar light-emitting device which displayed a different color on the light-guide plate with the color.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an exploded perspective view of a planar light emitting device according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view in the AA line direction after assembly of FIG. In the following description, “front surface”, “rear surface” and the like are used for convenience of description. For example, “front surface” refers to the left side in FIGS. 1 and 2 and “rear surface”. 1 and 2 will be described assuming that the right side is shown. That is, in FIGS. 1 and 2, the light diffusing member indicated by reference numeral 10 is located in front of the light guide member 8 indicated by reference numeral 8.

  Further, “upper” or “lower” is also used for convenience, and “upper” and “lower” are normally shown in the state of FIG. 1 or FIG. For example, the light source 4 indicated by reference numeral 4 is located below the light guide member 8.

The planar light emitting device 2 shown in FIG. 1 can be suitably used as a store signboard or a menu board.
The planar light emitting device 2 includes a point light source 4, a frame 6 that linearly accommodates the point light source 4 at predetermined intervals, and a light guide member 8 that has one end portion accommodated in the frame 6. The light diffusing member 10 is disposed so as to be superimposed on one main surface 8a of the light guide member 8 and has one end portion accommodated in the frame 6.

An LED lamp 4 is employed as the light source 4.
The frame 6 is made of synthetic resin having a substantially U-shaped cross section, and the recesses 12 are formed at predetermined intervals along the groove-shaped axis, and the LED lamps 4 are accommodated in the recesses 12. The recess 12 is a light reflecting surface (reflector) by coating with white ink or aluminum. If the frame 6 itself is made of light-reflective aluminum or the like, there is no need to dare to apply white ink or the like in the recess 12. In addition, the shape of the frame is not limited to a substantially U-shaped cross section, and when the planar light emitting device is used while lying down or leaning against a wall, the cross section may be approximately L-shaped. In short, it is sufficient that the light guide member and the light source can be accommodated.

If the light guide member 8 is light transmissive and has appropriate elasticity and flexibility (when the light diffusing member 10 is pressed, an adhesive force sufficient to maintain a close contact state is exhibited. The material is not limited, but, for example, a transparent material including an elastomer, specifically, a polyurethane-based elastomer, a polyvinyl chloride-based elastomer, a polystyrene-based elastomer, a polyolefin-based elastomer, an acrylic-based elastomer, or the like In view of optical characteristics, it is preferably formed from a material containing an acrylic elastomer, and a polymer block mainly composed of methacrylic acid ester units having a glass transition temperature of 50 ° C. or higher (A ) And a polymer block mainly composed of an acrylate ester unit having a glass transition temperature of 20 ° C. or less ( ) And more preferably formed from a material comprising an acrylic block copolymer having one or more, [methyl methacrylate polymer block] -
[N-butyl acrylate polymer block]-[methyl methacrylate polymer block], [methyl methacrylate polymer block]-[2-ethylhexyl acrylate polymer block]-[methyl methacrylate polymer block], [ Formed from a material containing an acrylic triblock polymer such as [methyl methacrylate polymer block]-[(n-butyl acrylate / 2-ethylhexyl acrylate) copolymer block]-[methyl methacrylate polymer block]. It is particularly preferred that Specific examples of the acrylic block copolymer and the production method thereof are described in International Publication No. 2009/054553 pamphlet. Moreover, although the light guide member 8 of the present embodiment is formed in a flat plate shape, this shape is not limited to a plate shape, and may be formed in a curved surface shape, for example. Furthermore, the light guide member 8 of the present embodiment is formed of, for example, a material including an elastomer having a main surface portion having transparency, and the central portion of the light guide member 8 is formed of a transparent hard material. It may be a laminate material. Further, the light guide member 8 may be subjected to a surface treatment such as antistatic and dirt prevention.

  The light diffusing member 10 diffuses and emits the illumination light emitted from the light guide member 8 and may be a translucent material that can emit light. For example, the base material is a polyester film or polycarbonate. Consists of a film made, embossed to have light diffusing performance on its surface, sandblasted, chemically corroded by chemical etching, etc., or applying a layer containing a light diffusing agent, Moreover, it can form by appropriate methods, such as making a base material itself contain a diffusion material. The light diffusing member 10 is preferably formed in a sheet shape, but is not limited to a sheet shape. Further, in this embodiment, the light diffusing member 10 is formed larger in one direction than the light guide member 10, but the size of the light diffusing member 10 may be the same as the size of the light guide member 10, It may be small.

Although not shown, a projection is formed on the outer surface 10a of the light diffusing member 10 opposite to the light guide plate 8 by embossing.
As described above, if the protrusion is formed on the outer surface 10a of the light diffusing member 10, when the irradiation light from the light source 4 is emitted to the outer surface 10a side of the light diffusing member 10, the illuminance of the light is reduced. It can be made stronger and scratches and dirt can be made inconspicuous.

  Therefore, in FIG. 1 or FIG. 2, if a person stands with the left side of the light diffusing member 10 as a side for viewing information and looks at the display surface, the information made up of the emitted light can be seen stronger and clearer. it can.

Examples of the method for forming the protrusion include physical processing such as embossing and sandblasting, and a chemical corrosion method using chemical etching.
The planar light emitting device 2 according to the present invention is formed as described above, and the operation will be described below.

Now, it is assumed that the planar light emitting device 2 as described above is installed as a storefront menu board, and a voltage is applied to the LED lamp 4 by a commercial power source.
At this time, the light emitted from the LED lamp 4 passes through the recess 12 and is guided into the light guide member 8. If this state is visually recognized from the outside of the light diffusing member 10 (the left side in FIGS. 1 and 2), the entire state is visually recognized as a lightly shining state. The light emitted from the LED lamp 4 is incident from the fore edge end surface 14 of the light guide plate 8 and then proceeds toward the other fore edge end surface as shown by an arrow C in FIG.

  Now, with a writing instrument that allows a person to apply pressure to the pen tip like a touch pen, stand in front of the light diffusing member 10 (on the left side of the light diffusing member 10), and light up the necessary information such as today's lunch menu. It is assumed that drawing is performed on the diffusing member 10. Then, a force corresponding to the force pressing the light diffusing member 10 reaches the light guide member 8, and as a result, the linear portion to which pressure is applied to the light diffusing member 10 emits light. This is because the light diffusing member 10 and the light guide member 8 are in close contact with each other, and the contact portion becomes an optical path of light.

  Thus, a new optical path is formed at the interface between the light diffusing member 10 and the light guide member 8, and a part of the light traveling in the direction of the arrow C while diffusing inside the light guide member 8 inward is shown in FIG. As shown by the arrow D in FIG. 2, the light diffusing member 10 leaks outward (forward).

  Therefore, if the display surface is visually recognized from the front side of the light diffusing member 10 on which the information is drawn, the lunch menu can be visually recognized as information on the optical display as shown in FIG. Even when the force applied to the outer surface 10a of the light diffusing member 10 is released from the writing instrument, the adhesive force is expressed between the light diffusing member 10 and the light guide member 8, so that the normal state As long as the LED lamp 4 is lit, the information can be displayed to the outside. Moreover, when drawing information, you may press from the light-diffusion member 10 side, and you may press from the light guide member 8 side. In addition, when nothing is arranged on the other surface of the light guide member 8 or a transparent or translucent member is arranged, light is emitted not only in front of the light diffusion member 10 but also in the rear. Since it leaks, the display surface can be visually recognized from the back side of the light diffusing member 10 on which information is drawn.

  On the other hand, in the planar light emitting device 2 of the present embodiment, when it is desired to change the menu to the dinner menu, the light diffusing member 10 is temporarily held in front, for example, by holding the light diffusing member 10 in front. When pulled to the side (in the direction of arrow E in FIG. 1), the light diffusing member 10 can be separated from one main surface 8 a of the light guide member 8. As a result, the information of the lunch menu drawn first is lost. If the light diffusing member 10 is returned to the original state again, that is, if the light diffusing member 10 is lifted again to the opposite side to the direction of the arrow E, the light diffusing member 10 is removed in a state where the information consisting of light is lost. The light guide member 8 can be locked again.

  From this state, if a pressing force is applied again using a writing tool and new information is written on the light diffusing member 10, new information can be displayed on the outer surface of the light diffusing member 10 by optical display.

  As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example at all. For example, in the above embodiment, the case of using as a storefront menu board has been described, but the planar light emitting device of the present invention can also be applied to a sign, a signboard, and the like. Further, for example, a power source such as a dry battery may be used without using a commercial power source. Further, in the above embodiment, the recess 12 is formed in the frame 6 and the light source 4 is accommodated in the recess 12. However, the present invention is not limited to this. It is also possible to guide to the edge end surface 14 of the light guide member 8.

The light source 4 is not limited to a point light source such as an LED, and a straight tube fluorescent lamp, an organic EL, or the like can also be used.
Furthermore, in the planar light-emitting device 2 of the above-described embodiment, light is incident from one fore edge surface 14 of the rectangular light guide member 8, but the fore edge surface where the light is incident is arranged in an L shape. It can also be made incident from the end face. Furthermore, in such a case, it is preferable to cover the two side surfaces of the light guide member 8 with the frame 6. Also, two straight tubular light sources (which may be arranged in the form of point light sources) may be prepared and arranged in an L shape, or may be arranged on the end surface facing each other, or three May be arranged in a U shape, or four may be arranged in a square shape. In addition, a point light source may be arranged at a corner portion of the light guide member 8, and there is no limitation as long as light is arranged so that light can be guided to the light guide member. A protective film or the like may be disposed on the surfaces of the light diffusion member 10 and the light guide member 8 that are not opposed to each other.

  Moreover, the light guide member 8 may be formed in a curved surface shape, may be a triangular shape, etc., or may be a circular shape or a spherical shape depending on circumstances, and the shape is not limited at all. Furthermore, the thickness is not limited to being substantially constant, and the thickness may gradually change so that the flat plate portion has a wedge shape. In short, in the present invention, the portion to which pressure is applied by a writing instrument or the like presses a flexible member to improve the adhesion to the light guide member 8, and the portion is used as an optical path of light to leak information composed of light outward. Any structure can be used.

  4 and 5 show a planar light emitting device 20 according to another embodiment of the present invention. Since the basic configuration of this embodiment is the same as that of the planar light emitting device 2 shown in FIGS. 1 and 2, the same elements are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the planar light emitting device 20, the light reflecting member 22 is integrally disposed on the other main surface 8 b side of the light guide member 8. Other configurations are the same as those in FIGS. That is, in the embodiment of FIGS. 4 and 5, the light emitted from the LED lamp 4 travels in the direction of the arrow C in the light guide member 8, but from the light reflecting member 22 side (right side of FIGS. 4 and 5). Cannot visually recognize the light in the light guide member 8. The light reflecting member reflects and emits the illumination light emitted from the light guide member 8 and may be any member that can reflect light, and the base material is made of, for example, a polyester film or a polycarbonate film. In addition, a filler can be blended so as to have a light reflection performance, a metal film can be formed, and bubbles can be included.

  In this planar light emitting device 20, by pressing a writing instrument or the like from either the light reflecting member 22 side or the light diffusing member side 10a side, information such as characters and pictures is applied to the surface of the light reflecting member 22. If it describes, the light guide member 8 and the light-diffusion member 10 corresponding to the part will contact closely, and the part to which the force was added will become an optical path of light. As a result, part of the light passing through the light guide member 8 in the direction of arrow C leaks to the outer surface of the light diffusing member 10 in the direction of arrow D. Thereby, the person on the left side of the light diffusing member 10 can confirm the information.

  When the light reflecting member 22 is integrally arranged outside the light guide member 8 as in this embodiment, the surface 22a of the light reflecting member 22 facing the light guide member 8 is embossed or the like. It is preferable that the protrusion is provided. If the protrusion is formed here, when the information is visually recognized from the light diffusion member 10 side on the front surface, information including light such as characters and pictures can be emitted more strongly. It is possible to prevent partial adhesion between the surface 22a facing the light guide member and the surface where the light guide member surface 8b is in contact, and to further improve the visibility. In addition, the formation method of a projection body can use the method similar to forming a projection body in the light-diffusion member 10. FIG.

FIG. 6 shows still another embodiment of the present invention.
In the planar light emitting device 26, the light reflecting member 22 is disposed so as to be able to contact and separate so as to cover the main surface of the light guide member 8. That is, the light guide member 8 and the light reflecting member 22 of the present embodiment are not integrated, but their joint surfaces can be separated or brought into close contact with each other. And in the planar light-emitting device 26 of a present Example, the light-diffusion member is not provided in the front side of the light guide member 8, unlike the case of the Example of FIG. 4, FIG.

  In such a planar light emitting device 26, pressure is applied from the light reflecting member 22 side or the light diffusing member side 10 side toward the light guide member 8 with a writing instrument, etc. If information consisting of light is written on the surface of the light reflecting member 22, the adhesion between the light reflecting member 22 and the light guide member 8 is improved, and as a result, the portion where the force is applied is the optical path of light. It becomes. Thereby, a part of the light passing through the light guide member 8 leaks to the left side of the light guide member 8 and displays information. In this case, if the surface 22a of the light reflecting member 22 is mirror-like, the adhesion between the light guide member and the light reflecting member is improved, and the visibility is improved.

  On the other hand, when the upper end portion of the light reflecting member 22 is pulled rightward in FIG. 6 to release the contact state between the light reflecting member 22 and the light guide member 8 and separate them from the outer surface of the light guide member 8. Will be lost.

A transparent or semi-transparent protective film may be disposed on the left side of the light guide member 8 in order to prevent the light guide member from being stained or damaged.
As described above, even in the planar light emitting device 26 according to another embodiment shown in FIG. 6, it is possible to change and display information repeatedly as in the case of the embodiment shown in FIGS. 1 to 5. Is possible.

  As described above, the present invention has been described by taking the menu board for displaying the store menu etc. as an example, but the present invention is not limited to such an example. For example, it can be used as a display device used in a school lesson, a toy, etc., and can be used in various fields.

Moreover, in the said Example, although the frame 6 was essential, it can also comprise without interposing this frame.
FIG. 7 shows an embodiment in which the frame 6 is not used. In this embodiment, for example, an example in which the light guide member 8 side is stood against a wall surface or in close contact with a table or the like is shown.

  That is, the planar light emitting device 30 includes a light guide member 8, a light diffusing member 10 and a light source 4 that are arranged so as to be able to come into contact with and separate from the light guide member 8, and the frame used in each of the above embodiments. 6 is not interposed. The light guide member 8 and the light diffusing member 10 have a substantially rectangular shape, but have a shape in which a corner portion is partially cut away, and the light source 4 has a structure that illuminates the edge end surface of the corner portion.

  Even in the planar light emitting device 30 having such a configuration, information including light drawn by pressing from the light diffusing member 10 side can be emitted in the direction of the arrow D as in the above embodiment. Further, if the light diffusing member 10 is separated from the light guide member 8, such information can be lost.

Thus, the frame 6 is not particularly essential. Further, the light source can be accommodated in a member such as an attachment, and the attachment can be assembled at an appropriate position of the light guide member.
Further, different color light source elements can be employed as the light source.

  FIG. 8 shows a surface light emitting device 40 according to another embodiment in which the light source is composed of a plurality of light source elements 32, 34, and 36 of three different colors. For example, the light source elements 32, 34, and 36 are LED elements that emit light such as red, green, and blue, respectively.

In this embodiment, slits 38 and 39 are formed in a vertical direction by a cutter or the like at a portion corresponding to the boundary of the length region of the LED element.
Thus, if the slits 38 and 39 are formed in the color boundary part, the color is switched without mixing in the slit part, and the planar light emitting device 40 can divide a plurality of colors to emit light.

  This is because there is a thin air layer in the slit portion. These slits 38 and 39 may be linear or curved. Moreover, although these slits may penetrate the light guide member completely, if the air layer thin to some extent is formed, it does not need to penetrate the light guide member.

DESCRIPTION OF SYMBOLS 2 Planar light-emitting device 4 Light source 6 Frame 8 Light guide member 8a One main surface 8b The other main surface 10 Light-diffusion member 10a Outer surface 12 Recess 14 Small edge end surface 20 Planar light-emitting device 22 Light reflection member 22a Light guide member Opposing surface 26 Planar light emitting device 30 Planar light emitting device 32, 34, 36 Light source element 38, 39 Slit 40 Planar light emitting device

Claims (9)

A light guide member that guides the light incident on the fore edge face of the one end where the light source is disposed, to the other fore edge face side;
A light diffusing member disposed so as to cover one main surface of the light guide member,
The light diffusing member is disposed so as to be able to contact with and separate from the light guide member,
When a force is applied from the outside to the light diffusing member or the light guide member in a state where the light diffusing member is in close contact with the light guide member, a portion where the force is applied becomes an optical path of light, While a part of the light passing through the light guide member leaks to the surface of the light diffusing member and displays information,
The planar light emitting device according to claim 1, wherein, when the contact state between the light diffusing member and the light guide member is released, information including light emitted from the surface of the light diffusing member is lost. A light reflecting member is integrally disposed so as to cover the other main surface of the light guide member,
When a force is applied from the outside to the light reflecting member or the light diffusing member in a state where the light diffusing member is in close contact with the light guide member, a portion where the force is applied becomes an optical path of light, While light passing through the light guide member leaks to the surface of the light diffusing member and displays information,
2. The planar light emission according to claim 1, wherein when the light diffusion member and the light guide member are released from contact with each other, information including light emitted from the surface of the light diffusion member is lost. apparatus. A light guide member that guides the light incident on the fore edge face of the one end where the light source is disposed, to the other fore edge face side;
A light reflecting member disposed opposite to cover one main surface of the light guide member,
The light reflecting member is disposed so as to be freely contacted and separated from the light guide member;
When a force is applied from the outside to the light reflection member or the light guide member in a state where the light reflection member is in close contact with the light guide member, a portion where the force is applied becomes an optical path of light, While a part of the light passing through the light guide member leaks to the surface of the light guide member and displays information,
The planar light-emitting device, wherein information formed of light emitted from the surface of the light guide member is lost when the contact state between the reflection member and the light guide member is released and separated.   The surface light-emitting device according to claim 1, wherein a surface of the light diffusing member facing the light guide member is formed in a mirror shape.   The planar light-emitting device according to claim 1, wherein a protrusion is formed on a surface of the light diffusing member opposite to the surface facing the light guide member.   The surface light-emitting device according to claim 2, wherein a protrusion is formed on a surface of the light reflecting member that faces the light guide member.   The surface light-emitting device according to claim 3, wherein a surface of the light reflecting member facing the light guide member is formed in a mirror shape.   The planar light-emitting device according to claim 1, further comprising a frame that houses the light source and on which one end of the light guide member is disposed.   9. The light source according to claim 1, wherein the light source is composed of a plurality of light source elements of different colors, and a slit is formed in the light guide member corresponding to a boundary of a length region of the light source elements. A surface light-emitting device according to claim 1.

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