JP5209145B2 - Light guide plate and wall guide plate provided with light guide plate - Google Patents

Description

  The present invention relates to a light guide plate and a wall surface guide plate including the light guide plate.

  Conventionally, as a wall guide plate for displaying display information, a light guide plate in which a plurality of light-transmitting reflective dots consisting of minute recesses are formed and a light source is provided on the side surface thereof, is provided on the back surface of the light guide plate. And a solar cell that photoelectrically converts light transmitted through the light guide plate, a secondary battery that charges an electromotive force of the solar cell, and a control unit that controls energization from the secondary battery to the light source (see FIG. Patent Document 1). According to this wall surface guide plate, the arrangement of the reflective dots represents the display information, and it can be used as a signboard for displaying the display information by making light incident on the reflective dots.

JP 2002-266465 A International Publication No. 2007/123202 JP 2002-328633 A JP 2008-296480 A JP 2003-45214 A

  However, the wall surface guide plate has a display function only when light is incident from the side surface, and cannot display the display function when light is not introduced from the side surface. Moreover, since the solar cell is arrange | positioned at the back surface, the subject that the visibility of the back side was impaired by this solar cell occurred.

  The present invention has been made in view of such problems. When light is incident from the side surface of the light guide plate, the display area can display display information regardless of whether light is incident, and the light is guided. Provided is a light guide plate having a light shielding plate and a light guide plate having a light shielding plate that can be visually recognized from the rear when not incident from the side surface of the light plate, and is difficult to visually recognize the rear when light is incident. The main purpose is to do.

  The present invention adopts the following means in order to achieve the main object described above.

The light guide plate of the present invention is
A light guide plate that mainly guides light incident from the side surface from the surface,
A shielding region having a plurality of first diffusion dots formed of a quadrangular pyramid-shaped recess, a plurality of diffusion grooves that are formed with a rough surface and are clouded to display display information, and the diffusion grooves A display area having a contour groove provided at the contour position,
In the state where light is not incident from the side, the shielding area can visually recognize an object behind, while the display area can visually recognize display information.

  The light guide plate of the present invention mainly has a shielding area and a display area. Since the shielding region has a plurality of first diffusion dots, it is difficult to visually recognize an object behind when the plurality of first diffusion dots shine when light is incident from the side surface. That is, the visibility of the object behind is lowered by making it difficult to see the light coming from the rear of the light guide plate by the derived light derived from the plurality of diffusion dots. Therefore, when there is an object that the user does not want to show behind the light guide plate, the possibility of the object behind being visually recognized can be reduced by making the light incident from the side surface. On the other hand, when the light is not incident from the side surface, the first diffusing dot transmits the light from the rear to the front surface side, so that the object behind can be easily visually recognized. Therefore, if installed in a place where both the case where it is desired to visually recognize the back of the light guide plate and the case where it is not desired to visually recognize the back, depending on conditions such as the person to be visually recognized and the time, if the light guide plate of the present invention is installed, The rear visibility can be switched depending on whether light is incident. In addition, since the display area includes the second diffusion dots or the diffusion grooves formed with a rough surface, the display area can be brightly illuminated when light is incident from the side surface. On the other hand, even when the light is not incident from the side surface, the second diffusion dot or the diffusion groove is formed with a rough surface, so that only the display region becomes like a frosted glass, and the display region is visually recognized. Is possible. In other words, when the light is incident, it is difficult to visually recognize the rear side of both the shielding area and the display area, but when the light is not incident, the portion other than the display area is The object behind can be visually recognized. Therefore, it is possible to distinguish between the case where the user wants to visually recognize the rear and the case where the user does not want to visually recognize the rear. Here, the “display information” of the present invention refers to a representation of characters, symbols, figures, patterns, etc., by a combination of a plurality of second diffusion dots or diffusion grooves.

  In the light guide plate of the present invention, the first diffusion dots may be arranged at a pitch of 2.0 mm to 6.0 mm. By setting to such a range, it is possible to make it appear as if the first diffusing dots are shining lightly. Therefore, it is possible to make it difficult to visually recognize the rear object. In the present specification or claims, the “pitch” of a diffusion dot refers to the distance from the center of a dot to the center of an adjacent diffusion dot, and the pitch of the diffusion groove refers to the center line of the diffusion groove. The distance to the center line of adjacent diffusion grooves.

  In the light guide plate of the present invention, the surface in the second diffusion dot or the diffusion groove may be processed with a laser processing mark. By using laser processing marks as a means for forming the surface in the second diffusion dot or diffusion groove into a rough surface, the surface in the second diffusion dot or diffusion groove can be easily roughened. Even in a state where no light is incident from the side surface, the second diffusion dots or the diffusion grooves can be displayed, and as a result, the display region can be made visible. In addition, the laser processing trace may be a fine groove shape or a fine dot shape.

  In the light guide plate of the present invention, the surface in the second diffusion dot or in the diffusion groove may be formed by a narrow groove made of a laser processing mark having a width of 0.2 mm to 0.5 mm. By creating a second diffusing dot or diffusing groove with a narrow groove of a laser processed trace of 0.2 mm to 0.5 mm, a second diffusion that can be seen well even when no light is incident from the side of the light guide plate A dot or a diffusion groove can be formed, and as a result, a display region that can be easily viewed even when light is not incident can be obtained.

  In the light guide plate of the present invention, the surface in the second diffusion dots may be formed into a rough surface by ultrasonic processing. Since a wide range can be processed at a time by forming the second diffusion dots by ultrasonic processing, the molding time of the light guide plate can be shortened. In order to roughen the surface of the second diffusion dot by ultrasonic processing, the time and pressing time are adjusted, or the tip of the ultrasonic processing horn when forming the second diffusion dot is formed on the rough surface in advance. Can be achieved.

  The light guide plate of the present invention may include a non-processed region that is not processed. By adopting such a configuration, it is possible to form a transparent region both in the case where light is incident and in the case where light is not incident, thereby improving the design of the light guide plate. be able to.

  The wall surface guide plate of the present invention is a wall surface guide plate provided with any of the light guide plates described above and a plurality of LED light sources that receive irradiation light from the side surfaces of the light guide plate. According to this wall guide plate, since any one of the light guide plates described above is provided, the same effect as that of the light guide plate described above, that is, a wall guide plate having a shielding area and a display area can be obtained. It is possible to provide a wall surface guide plate capable of improving the visibility of an object behind and shielding it while always displaying information.

FIG. 1 is a front view illustrating the outline of the configuration of the light guide plate 10 according to the first embodiment. FIG. 2 is a perspective view schematically showing the configuration of the light guide plate 10 according to the first embodiment. 3 is an enlarged view of a portion A in FIG. 2 and a cross-sectional view taken along the line BB. FIG. 4 is a diagram schematically illustrating a state of visibility of an object behind in a state where light is not incident on the light guide plate 10 according to the first embodiment. FIG. 5 is a diagram schematically showing the visibility of an object behind when light is incident on the light guide plate 10 according to the first embodiment. FIG. 6 is a schematic diagram showing another embodiment in which square pyramid-shaped diffusion dots are provided on both sides of the light guide plate 10 according to the first embodiment. FIG. 7 is a front view of the wall surface guide plate 100 according to the second embodiment. FIG. 8 is a CC cross-sectional view of the wall surface guide plate 100 according to the second embodiment.

  Here, based on the drawings briefly described above, in describing the embodiment for carrying out the present invention, the correspondence between the components of the present invention and the components of the present embodiment will be clarified. In the first embodiment, the quadrangular pyramidal diffusion dot 21 is used as the “first diffusion dot” of the present invention, the planar diffusion dot 33 is used as the “second diffusion dot”, and the LED is used as the “LED light source”. The lighting tool 120 was used.

(First embodiment)
The configuration of the light guide plate 10 according to the first embodiment will be described in detail with reference to FIGS. 1 to 3. Here, FIG. 1 is a front view showing the outline of the configuration of the light guide plate 10 according to the first embodiment of the present invention, and FIG. 2 is a perspective view showing the outline of the configuration of the light guide plate 10. FIG. 3 is a partially enlarged view of A of FIG. 2 and a partial cross-sectional view thereof.

  As shown in FIG. 1, the light guide plate 10 is a highly transparent methacrylic resin plate formed in a substantially rectangular parallelepiped plate shape having a thickness of 8.0 mm, a height of 2240 mm, and a width of 470 mm. The light guide plate 10 mainly includes a shielding area 20, a display area 30, and a non-processed area 40. In addition, the chair in FIG. 1 is expressed as a rear object.

  As shown in FIG. 3, the shielding area 20 has a plurality of quadrangular pyramid-shaped diffusion dots 21 formed on the back surface. The quadrangular pyramid-shaped diffusion dots 21 are concave portions that are recessed in a substantially quadrangular pyramid shape, and are provided so that a position corresponding to the bottom surface of the quadrangular pyramid is located on the back surface of the light guide plate 10. In the first embodiment, the length of each side of the quadrangular pyramid-shaped diffusion dots 21 is about 0.6 mm, the depth is about 0.4 mm, and the pitch between adjacent quadrangular pyramid-shaped diffusion dots 21 is 2.0 mm. .

  The quadrangular pyramid-shaped diffusion dot 21 uses an ultrasonic processing horn in which four processing dots each having a shape obtained by inverting the quadrangular pyramid-shaped diffusion dot 21 are arranged in a matrix in the vertical and horizontal directions on the tip surface. Formed by processing. That is, a rectangular pyramid-shaped diffusion dot having a shape reflecting the shape of the processing dot by applying ultrasonic vibration to the ultrasonic processing horn and pressing the ultrasonic processing horn perpendicularly to the back surface of the light guide plate 10 21 is formed.

  As shown in FIG. 1, the display area 30 has a first display area 30a and a second display area 30b. The first display area 30a represents an arbitrary mark and a certain character as display information, and the second display area 30b represents the direction of the stairs as display information.

  In the first display area 30 a, a plurality of planar diffusion dots 33 regularly arranged and contour grooves 34 provided at the contour positions of the planar diffusion dots 33 are formed on the back surface of the light guide plate 10. Yes. Therefore, when light is incident from the side surface of the light guide plate 10, the light is refracted by the plurality of planar diffusion dots 33 and the contour grooves 34, and the light is mainly derived from the surface, and the planar diffusion dots 33 and the contour grooves 34. Is brightly illuminated and information is visible. In the first embodiment, the planar diffusion dots 33 and the contour grooves 34 are formed so that a predetermined mark and the characters “SKG” are visible.

  As shown in FIG. 1, the planar diffusion dots 33 are formed of circular dots and have a rough surface. The surface of the flat type diffusion dot 33 is not formed in a concave shape like the quadrangular pyramid type diffusion dot 21, but is formed in a flat shape as a whole although it is a rough surface. The flat type diffusion dots 33 are obtained by ultrasonic processing using an ultrasonic processing horn in which processing dots having a shape obtained by inverting the flat type diffusion dots 33 on the front end surface are arranged in a matrix form of four in each of the vertical and horizontal directions. Formed by. At this time, the tip of the ultrasonic processing horn is formed in a rough surface in advance. Therefore, by applying ultrasonic vibration to the ultrasonic processing horn, the planar diffusion dots 33 having a shape reflecting the rough surface shape of the processing dots are formed. The planar diffusion dot 33 has a diameter of about 0.8 mm. The spacing between the diffusion dots is set at a pitch of 1.2 mm. Compared with the quadrangular pyramidal diffusion dots 21, the pitch is shorter. By shortening the pitch and narrowing the region between the unprocessed pitches, it is possible to make it easy to see even when light is not incident on the planar diffusion dots 33.

  The contour groove 34 is provided at the contour position of the display information displayed by the planar diffusion dots 33, and is formed by a plurality of laser processing marks as in the case of the diffusion groove 35 described later. By forming the contour groove 34, the contour of the display information can be clarified and the display information can be easily recognized.

  In the second display region 30 b, diffusion grooves 35 that are regularly arranged and a contour groove 34 provided at a contour position of the diffusion groove 35 are formed on the back surface of the light guide plate 10. Therefore, when light is incident from the side surface of the light guide plate 10, the light is refracted by the plurality of diffusion grooves 35 and the contour grooves 34, and the light is mainly derived from the surface, and illuminates the diffusion grooves 35 and the contour grooves 34. The information becomes visible. In the first embodiment, the diffusion groove 35 and the contour groove 34 are formed so that the design indicating the direction of the stairs is visually recognized.

  The diffusion groove 35 is formed inside the outline of the display information by a groove having a width of 0.5 to 0.7 mm so as to be a regular parallel line at equal intervals. The contour groove 34 is formed in the same manner as the diffusion groove 35. The diffusion groove 35 and the contour groove 34 are linearly formed with a width of micro units by irradiating a laser beam a plurality of times linearly from one end side to the other end side of the groove after laser processing of the outer periphery. It is formed by connecting narrow grooves 36 made of laser processing marks of 2 mm to 0.5 mm. For example, a ladder-like shape or a hatching shape used for drawing is formed inside the groove, and a rough surface is formed in which a plurality of parallel laser processing marks are formed inside the groove. Become. Finally, a groove having a width of 0.5 to 0.7 mm is formed by processing the entire groove. In addition, it is preferable to provide the laser processing marks so as to intersect the incident light to the light guide plate 10. For example, when light is incident from the side surface, the laser processing trace may be formed so as to have a plurality of vertical hatching or oblique hatching. Compared with the case where the laser processing trace is processed in parallel with the incident direction of light, the optical path and the laser processing trace always intersect with each other, so that the light is easily refracted by the laser processing trace, and the diffusion groove 35 and the contour groove 34 can appear brighter. In addition, the size of the quadrangular pyramid type diffusion dot 21, the planar type diffusion dot 33, the diffusion groove 35, and the outline groove 34 in the drawing is drawn larger than the actual size for the sake of drawing.

  The non-processed area 40 is a transparent area in which no processing is performed on the surface of the light guide plate 10, and a rear object can always be visually recognized.

  The light guide plate 10 manufactured as described above has the following effects. In the state where the light is not incident on the light guide plate 10, the shielding region 20 may refract the light from the back by the square pyramidal diffusion dots 21, but as shown in FIG. The light from the rear side can pass through to the front side in both the region between 21 and the quadrangular pyramid-shaped diffusion dots 21, and the rear object (chair in the first embodiment) can be easily visually recognized. In this case, in order to make it easier to visually recognize the object behind, it is preferable that the surface of the quadrangular pyramid-shaped diffusion dots 21 is formed on a smooth surface. On the other hand, when light is incident from the side surface of the light guide plate 10, the incident light is refracted by the plurality of quadrangular pyramid-shaped diffusion dots 21 as shown in FIG. It will light up brightly. Therefore, it is difficult to recognize the light of the chair, which is an object on the rear side, by the brightness of the light derived from the incident light, and it is difficult to visually recognize the object on the rear side. 4 and 5 are schematic representations, and the actual appearance is due to light and is different.

  Since the display region 30 is formed with a rough surface in the state where no light is incident on the light guide plate 10, the flat diffusion dots 33, the diffusion grooves 35, and the contour grooves 34 are formed with rough surfaces. The surfaces of the diffusion groove 35 and the contour groove 34 are diffusely reflected and visually recognized as a cloudy glass such as frosted glass, so that display information can be visually recognized. On the other hand, when light is incident from the side surface of the light guide plate 10, the light is refracted by the planar diffusion dots 33, the diffusion grooves 35, and the contour grooves 34, and the light is mainly derived from the surface to illuminate display information brightly. become.

  The non-processed region 40 is a transparent region both in the state where light is incident and in the state where no light is incident, and a rear object can always be visually recognized.

  In the first embodiment described above, as the first diffusion dot, the quadrangular pyramid-shaped diffusion dot 21 is a concave portion recessed in a substantially quadrangular pyramid shape, but the invention is not limited to this, and the first diffusion dot is a hemispherical shape. Various forms, such as a recessed part and a conical recessed part, are employable. Also by this, the same effect as the above-mentioned effect can be obtained. Moreover, it does not necessarily need to be a concave portion, and the first diffusion dot may be formed to be raised (convex) by screen printing or the like.

  In the first embodiment described above, the length of each side of the quadrangular pyramid-shaped diffusion dot 21 is 0.6 mm and the depth is 0.4 mm as the first diffusion dot. However, the present invention is not limited to this. For example, the length of each side of the quadrangular pyramid-shaped diffusion dots 21 may be 0.6 mm to 1.5 mm. Further, the depth of the quadrangular pyramidal diffusion dots 21 may be, for example, 0.4 mm to 0.8 mm. In any case, the same effect as the above-described embodiment can be obtained. Moreover, although the pitch between the adjacent quadrangular pyramidal diffusion dots 21 is 2.0 mm, the pitch is not limited to this, and may be, for example, a pitch of about 1.5 mm to about 8.0 mm. In either case, the same effect as that of the first embodiment described above can be obtained. Preferably, the pitch is 2.0 mm to 6.0 mm. By setting to such a range, when light is incident on the light guide plate 10, the light is blurred between the respective pitches, and the visibility of the object behind is easily hindered.

  In the first embodiment described above, the quadrangular pyramid-shaped diffusion dots 21 having the same shape are provided as the first diffusion dots, but the shape and size of the quadrangular pyramid-shaped diffusion dots 21 may be the same. Good or different. For example, as the distance from the light source increases, each side of the quadrangular pyramid-shaped diffusion dot 21 may be lengthened gradually, or the depth of the quadrangular pyramid-shaped diffusion dot 21 may be gradually increased. In this case, the amount of light bent is small at a position where the light is close and strong from the light source, and the amount of light bent is increased as the distance from the light source is increased. In addition to the effects of the above-described embodiment, The brightness can be shown evenly.

  In the first embodiment described above, the quadrangular pyramid-shaped diffusion dots 21 are provided only on the back surface side as the first diffusion dots. However, as shown in FIG. It may be provided. By providing the quadrangular pyramid-shaped diffusion dots 21 on both the front surface side and the back surface side, when light is incident from the side surface of the light guide plate 10, it is possible to make it difficult to see an object behind. At this time, the front and back side quadrangular diffusion dots 21 may be provided at the same position, but may be provided alternately as shown in FIG. By providing them alternately, the non-processed area becomes smaller when viewed from the front, so that it is difficult to see an object behind. In addition, the shape of the 1st spreading | diffusion dot of the surface side and a back surface side may be the same, or may differ. Further, the size of the first diffusion dot may be different between the front side and the back side.

  In the above-described first embodiment, the length of the diameter of the planar diffusion dot 33 as the second diffusion dot is 0.8 mm. However, the present invention is not limited to this, and the planar diffusion dot 33 is not limited thereto. The length of the diameter may be, for example, 0.6 mm to 1.5 mm. Moreover, although the pitch between the adjacent quadrangular pyramidal diffusion dots 21 is 1.2 mm, the pitch is not limited to this, and may be, for example, 1.0 mm to 8.0 mm. Within such a range, the display information can be visually recognized to the extent that light is not incident from the side surface of the light guide plate.

  In the first embodiment described above, the diffusion groove 35 has been described using a narrow groove formed by a vertical laser processing mark. However, the present invention is not limited to this, and a groove formed in the horizontal direction may be used. It may be a groove formed obliquely. Depending on the direction of the incident light, the diffusion groove 35 having the optimum direction can be selected as appropriate.

  Moreover, in 1st Embodiment mentioned above, although the width | variety of the diffusion groove 35 was 0.5-0.7 mm, it is not limited to this, The width | variety of the diffusion groove 35 is 0.6 mm- It may be 1.5 mm. In any case, the same effect as the above-described embodiment can be obtained. Moreover, although the pitch of the adjacent diffusion grooves 35 is 2.0 mm, the pitch is not limited to this, and may be a pitch of about 2.0 mm to about 8.0 mm, for example. In either case, the same effect as that of the first embodiment described above can be obtained. Preferably, the pitch is 2.0 mm to 6.0 mm. By setting to such a range, when light is incident on the light guide plate 10, the light is blurred between the respective pitches, and the visibility of the object behind is easily hindered.

  Moreover, in 1st Embodiment mentioned above, although the laser processing trace of 0.2 mm width was employ | adopted as a laser processing trace, it does not limit to this but selects suitably in the range of 0.1-0.8 mm. Can do. Preferably, a laser processing mark having a width of 0.2 to 0.5 mm may be employed. If it is this range, it has moderate visibility even in the state where the light is not incident from the side surface of the light guide plate 10, and can be illuminated well brightly even when the light is incident.

  In the first embodiment described above, the contour groove 34 is formed. However, the contour groove 34 is not necessarily formed.

(Second Embodiment)
Next, the wall surface guide plate 100 using the light guide plate 10 according to the first embodiment will be described in detail with reference to FIGS. Here, FIG. 7 is a front view showing an outline of the structure of the wall surface guide plate 100, and FIG. 8 is a sectional view taken along the line CC in FIG. As shown in FIGS. 7 and 8, the wall surface guide plate 100 includes a tempered glass plate 110 disposed on the front and back sides of the light guide plate 10, and two LED illumination tools 120 including a plurality of LEDs 121 disposed on the left and right side surfaces, The light guide plate 10, the tempered glass plate 110, and the LED illuminating device 120 are provided with a frame 130 that fixes the light guide plate 120 from the left and right sides, and a support base 140 that supports the light guide plate 10 on the bottom surface side.

  The tempered glass plate 110 is a tempered glass plate having a thickness of 5 mm, and has a function of preventing the surface of the light guide plate 10 from being damaged.

  The two LED illuminators 120 are attached so that the plurality of LEDs 121 correspond to the side surfaces of the light guide plate 10, and the two LED illuminators 120 are arranged to correspond to the left and right side surfaces of the light guide plate 10, respectively. Has been. The two LED illuminators 120 may have the same light amount or different light amounts. Moreover, you may change the hue of the light derived | led-out from the light-guide plate 10 by making each light emission color of the two LED lighting tools 120 different, and light-emitting either left or right.

  The frame 130 is for fixing the light guide plate 10, the tempered glass plate 110, and the LED lighting device 120 from both sides. After fixing with the frame 130, the wall guide plate 100 is made by attaching the support stand 140.

  The wall surface guide plate 100 can turn on the LED illuminating device 120 with electric power supplied from a power source (not shown), and light can enter from the side surface of the light guide plate 10. Thereby, there can exist an effect similar to the light-guide plate 10 of 1st Embodiment. That is, when the light is incident, it is difficult to visually recognize the rear side of both the shielding area 20 and the display area 30, but when the light is not incident, the display area A portion other than 30 may be a wall surface guide plate 100 that can visually recognize a rear object.

  In 2nd Embodiment mentioned above, although the LED lighting tool 120 shall be installed in a right-and-left side surface, you may provide the LED lighting tool 120 in the support stand 140. FIG.

  In addition, this invention is not limited to 1st Embodiment mentioned above-2nd Embodiment at all, and as long as it belongs to the technical scope of this invention, it cannot be overemphasized that it can implement with a various aspect.

  In 1st Embodiment-2nd Embodiment mentioned above, although the light-guide plate shall be the board made from the methacrylic resin which has permeability | transmittance, if it is a raw material which has permeability | transmittance, it will not be limited to the product made from methacrylic resin. In addition to methacrylic resins such as methyl methacrylate and ethyl methacrylate, various materials such as acrylic resins such as methyl acrylate and ethyl acrylate, polycarbonate, and polyethylene can be used. In any case, the same effect as the above-described embodiment can be obtained.

  As shown in the above-described embodiment, it can be used as a light guide plate for illumination, particularly for illumination.

  DESCRIPTION OF SYMBOLS 10 ... Light guide plate, 20 ... Shielding region, 21 ... Square pyramid type diffusion dot, 30 ... Display region, 30a ... First display region, 30b ... Second display region, 33 ... Planar type diffusion dot, 34 ... Contour groove, 35 DESCRIPTION OF SYMBOLS ... Diffusion groove, 36 ... Narrow groove, 40 ... Non-working area | region, 100 ... Wall surface guide plate, 110 ... Tempered glass plate, 120 ... LED lighting tool, 121 ... LED, 130 ... Frame, 140 ... Support stand

Claims (8)

A light guide plate that mainly guides light incident from the side surface from the surface,
A shielding region having a plurality of first diffusion dots made up of conical or quadrangular pyramid-shaped recesses, a plurality of diffusion grooves that are formed with a rough surface and are clouded to display display information, and the diffusion A display area having a contour groove provided at the contour position of the groove,
A light guide plate characterized in that, in the state where light is not incident from the side, the shielding area can visually recognize an object behind, while the display area can visually recognize display information.   The light guide plate according to claim 1, wherein a surface in the diffusion groove is processed with a plurality of parallel laser processing traces.   3. The light guide plate according to claim 1, wherein a surface of the diffusion groove is formed by a narrow groove made of a laser processing mark having a width of 0.1 mm to 0.8 mm.   4. The light guide plate according to claim 1, wherein a width of the diffusion groove is 0.5 mm to 0.7 mm. 5.   The light guide plate according to any one of claims 1 to 4, wherein the pitch of the diffusion grooves is 2.0 mm to 8.0 mm.   The light guide plate according to any one of claims 1 to 5, wherein the pitch of the diffusion grooves is shorter than the pitch of the first diffusion dots. In the light-guide plate of any one of Claim 1 to 6,
A light guide plate comprising a non-processed region that has not been processed. The light guide plate according to any one of claims 1 to 7,
A plurality of LED light sources for irradiating irradiation light from the side surface of the light guide plate;
Wall guide plate with

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