JP2014212079A - Light guide plate and lighting fixture having light guide plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture capable of reducing the thickness and size, and a light guide plate used for the lighting fixture.SOLUTION: Light radiated from a light source 44 to an extension part 36 is reflected at an inclined side 34a and an inclined side 34b and guided to the inside of a light guide plate 30, and emitted in a principal surface direction by diffusion dots 38. At this time, as a reflection member 50 is attached on one side of the principal surface, the light is emitted strongly on a surface opposite from the side on which the reflection member 50 is attached. In addition, as the light source 44 is fixed on an outside surface side of the light guide plate 30 by a fixing metal fitting 40, this lighting fixture 20 can be mounted as long as there is space equivalent to the thickness of the light guide plate 30. In other words, the space-saving and bright lighting fixture can be provided.

Description

  The present invention relates to a light guide plate and a lamp having the light guide plate.

  Conventionally, various light guide plates and lamps using the light guide plates used for tail lamps and stop lamps for automobiles are known. For example, Patent Document 1 describes a lamp in which a light guide lens and a reflection plate are in close contact with each other, and a light source is attached to the back surface of the reflection plate in close contact with the light fixture.

JP 2009-230996 A

  However, for example, when used as a vehicular lamp, in order to effectively utilize a limited vehicle space, supply of a further downsized lamp is eagerly desired. Considering such a problem, it cannot be said that this lamp is sufficiently small in size, and there is another problem that it is necessary to make it thinner and smaller.

  The present invention has been made in view of such problems, and a main object of the present invention is to provide a lamp that can be thinned and reduced in size and a light guide plate used for the lamp.

  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 emits light emitted from a light source from a main surface,
A through hole located at the center of the main surface;
A recess formed on the inner surface of the light guide plate and recessed in the direction of the outer surface of the light guide plate;
Formed on the opposite side of the recess, extending in the direction of the outer surface of the light guide plate, and an extension part on which the light is incident,
It is characterized by providing.

  In this light guide plate, the light incident from the extension part is reflected by the boundary surface of the recess located on the opposite side of the extension part and guided to the inside of the light guide plate. This light is emitted in the main surface direction through the light guide plate. In this way, when light is emitted from the outer surface direction of the light guide plate to the extending portion, light can be emitted from the main surface direction, so there is no need to arrange the light source on the main surface side, and the thickness of the light guide plate is reduced. Can be stored if there is enough space, which contributes to space saving. At this time, since the through hole is provided at the center position of the main surface, light can be diffused only from the vicinity of the outer edge excluding the center position where the through hole is provided. For example, when such a light guide plate is used as a tail lamp for a vehicle, it can be installed in a narrow space, so that the space for the tail lamp can be reduced and the space in the vehicle can be used effectively. Furthermore, since a through hole is provided at the center position of the light guide plate, it can be used in combination with various brake lamps easily and can be easily combined with existing brake lamps. Here, the diffusing dot includes both the concave shape and the convex shape.

  The light guide plate of the present invention may further include a plurality of diffusion dots that are provided on at least one side of the main surface and diffuse the light. By doing so, the light incident on the light guide plate is emitted mainly from the main surface direction, so that it becomes brighter than the case where there is no diffusion dot.

  In the light guide plate of the present invention, an area of the through hole may be larger than an area of the main surface. By making the area of the through hole located at the center position of the main surface larger than the area of the light guide plate, for example, when it is arranged as a tail lamp for a vehicle so as to overlap the brake lamp, it passes through the through hole and the brake lamp Can be visually recognized. At this time, since the area of the through hole is larger than the area of the main surface of the light guide plate serving as a tail lamp, the brake lamp is easier to visually recognize than the case where the area of the through hole is small. In other words, the brake lamp can be made conspicuous with respect to the following vehicle, and it is easier to notify that the brake is being used. Here, the area of the main surface is the area of the portion where the main surface exists, and does not include the area of the through hole.

  In the light guide plate of the present invention, the height of the extending portion may be lower than the depth of the concave portion. In this way, when light enters from the extending portion, the distance between the incident surface and the concave portion is shortened, so that the light can be reflected by the concave portion with reduced light attenuation. By doing so, the entire light guide plate can be made brighter than in the case where the height of the extending portion is high, and space is saved by reducing the area of the extending portion.

  In the light guide plate of the present invention, the recess may be formed by a pair of inclined sides formed so as to be perpendicular to each other. By doing so, when light is incident from the extending portion located on the surface opposite to the concave portion, the light can be diffused in the respective directions by the respective inclined sides. In addition, if the inclined sides have the same length, the inclined sides form an angle of 45 ° with respect to the light traveling direction, so that the light path can be changed to a right angle and formed so as to be at right angles to each other. Compared with the case where it is not carried out, light can be guided to a position farther from the light guide plate.

  The lamp of the present invention includes any one of the light guide plates described above, and a light source provided on the outer surface side of the light guide plate and at a position facing the extension portion. It may be. Since this lamp includes any of the light guide plates described above, the same effect as any of the light guide plates described above, for example, if there is a space for the thickness of the light guide plate, the lamp can be installed. The effect that can be obtained.

The light guide plate of the present invention is
A light guide plate that mainly emits light emitted from a light source from a main surface,
A through hole located at the center of the main surface;
A notch penetrating from the inner surface of the light guide plate to the outer surface of the light guide plate;
With
The light is irradiated on the inner surface of the notch.

  In this light guide plate, light incident from the inner surface of the notch is emitted in the main surface direction through the light guide plate. Thus, since light can be emitted from the main surface direction when light is applied to the inner surface of the notch, it is not necessary to place the light source on the main surface side, and if there is space for the thickness of the light guide plate It is possible to save space. At this time, since the through hole is provided at the center position of the main surface, light can be diffused only from the vicinity of the outer edge excluding the center position where the through hole is provided. For example, when such a light guide plate is used as a tail lamp for a vehicle, it can be installed in a narrow space, so that the space for the tail lamp can be reduced and the space in the vehicle can be used effectively. Furthermore, since a through hole is provided at the center position of the light guide plate, it can be used in combination with various brake lamps easily and can be easily combined with existing brake lamps.

  The light guide plate of the present invention adopting this aspect may further include a plurality of diffusion dots that are provided on at least one side of the main surface and diffuse the light. By doing so, the light incident on the light guide plate is emitted mainly from the main surface direction, so that the main surface direction becomes brighter than in the case where there is no diffusion dot.

  In the light guide plate of the present invention adopting this aspect, the area of the through hole may be larger than the area of the main surface. By making the area of the through hole located at the center position of the main surface wider than the area of the light guide plate, when used as a tail lamp for vehicles, the light emission area of the brake lamp arranged at the position of the through hole is the light emission of the tail lamp. Since it becomes wider than the area, the brake lamp can be made conspicuous with respect to the following vehicle, and it is easier to notify that the brake is being used. Here, the area of the main surface is the area of the portion where the main surface exists, and does not include the area of the through hole.

  The lamp of the present invention may include any one of the light guide plates adopting this aspect and a light source that irradiates light to the inner surface of the cutout portion. By installing the light source in the notch, a lamp can be installed if there is a space in which the light guide plate can be installed.

  In the lamp of the present invention, the plurality of diffusion dots may be provided on both sides of the main surface, and a reflective member that reflects light may be provided on one side of the main surface. . By doing so, the number of diffusion dots increases as compared with the case where the number of the plurality of diffusion dots is provided only on one side of the main surface, and the amount of diffused light also increases. In addition, since a reflecting member is provided on one side of the main surface, the light emitted to one side of the main surface is reflected by the reflecting member, and is emitted again from the main surface on the opposite side through the light guide plate. The By doing so, it is possible to provide a brighter lamp as compared with the case where no reflecting member is provided.

FIG. 1 is an exploded perspective view showing an outline of the configuration of the lamp 20. FIG. 2 is a hexahedral view and a cross-sectional view showing an outline of the configuration of the light guide plate 30. FIG. 3 is a hexahedral view and a cross-sectional view illustrating the outline of the configuration of the light guide plate 30 according to another embodiment. FIG. 4 is a hexahedral view and a cross-sectional view illustrating the outline of the configuration of the light guide plate 30 according to still another embodiment. FIG. 5 is a hexahedral view and a cross-sectional view illustrating the outline of the configuration of the light guide plate 30 according to still another embodiment. FIG. 6 is a hexahedral view and a cross-sectional view illustrating the outline of the configuration of the light guide plate 30 according to still another embodiment. FIG. 7 is an exploded perspective view showing an outline of the configuration of the lamp 60 according to the second embodiment. FIG. 8 is a hexahedral view and a cross-sectional view illustrating the outline of the configuration of the light guide plate 70. FIG. 9 is a hexahedral view and a cross-sectional view illustrating the outline of the configuration of the light guide plate 70 according to another embodiment. FIG. 10 is a partially enlarged perspective view for explaining a variation of the diffusing dots 38.

  Next, the lamp 20 according to the first embodiment will be described in detail as an example of the embodiment of the present invention based on the above-described drawings. The embodiments and drawings described below exemplify a part of the embodiments of the present invention, and are not used for the purpose of limiting to these configurations, and do not depart from the gist of the present invention. It can be changed as appropriate. In addition, the same or similar code | symbol is attached | subjected to the corresponding component in each figure.

  As shown in FIG. 1, a lamp 20 that is an example of an embodiment of the present invention includes a light guide plate 30 having a plurality of diffusion dots 38 on both principal surfaces, and a light source 44 that irradiates light inside the light guide plate 30. And a reflection member 50 attached to one side of the main surface of the light guide plate 30. In the lamp 20, light emitted from the light source 44 provided on the outer surface side is diffused by the light guide plate 30 and emitted to the main surface side of the light guide plate 30. At this time, since the reflecting member 50 is adhered to one side of the main surface, the light emitted to one side of the main surface is reflected by the reflecting member 50, passes through the light guide plate 30 again, and is on the opposite side. Exits from the main surface. By doing so, the lamp 20 has sufficient brightness.

  As shown in FIGS. 1 and 2, the light guide plate 30 is a plate-like member made of methacrylic resin, and is a substantially ring-shaped member having a through hole 32 similar in shape to the outer diameter of the light guide plate 30 at the center. is there. A plurality of diffusion dots 38 are provided on both main surfaces of the light guide plate 30. Further, a concave portion 34 having an inclined side 34a and an inclined side 34b is provided on the inner side surface of the light guide plate 30, and the surface opposite to the concave portion 34 (the outer surface of the light guide plate 30) has an outer surface direction. An extending portion 36 is provided to extend to the surface. In this light guide plate 30, light incident from the incident surface 36a of the extending portion 36 provided on the outer surface side is diffused by a plurality of diffusion dots 38 provided on both main surfaces, and light is emitted in the main surface direction. The

  The concave portion 34 is a concave portion provided on the inner surface side of the light guide plate 30 and is formed by the inclined side 34 a and the inclined side 34 b. At this time, the inclined side 34a and the inclined side 34b are formed so that the angle formed by the inclined side 34a and the inclined side 34b is a right angle.

  The extending part 36 is provided on the outer surface of the light guide plate 30 at a position opposite to the recessed part 34. The concave portion 34 is composed of an inclined side 34a and an inclined side 34b that are perpendicular to each other. For this reason, the angle formed between the optical path of the light incident from the incident surface 36a, which is the outer surface of the extending portion 36, and the inclined side 34a or the inclined side 34b is 45 °, so that the light incident from the incident surface 36a is The light is reflected at right angles by the inclined side 34a or the inclined side 34b. By doing so, the light incident from the incident surface 36a is widely reflected by the inclined side 34a or the inclined side 34b, and it is possible to reduce the possibility that the brightness of the entire light guide plate 30 is uneven. . Such an effect is particularly significant when the shape of the light guide plate is square (for example, as shown in FIG. 6).

  The diffusion dots 38 are concave portions (see FIG. 10A) that are provided in a plurality of square pyramid shapes on one side of the main surface of the light guide plate 30, and each side of the diffusion dots 38 has a length of about 0.6 mm and a depth. Is approximately 0.4 mm, and the pitch between adjacent quadrangular pyramid-shaped diffusion dots 38 is 2.0 mm. Thus, the diffusion dot 38 is provided with a position corresponding to the bottom surface of the quadrangular pyramid on the main surface side. Further, the diffusion dots 38 are provided such that the bottom surfaces of the quadrangular pyramids forming the diffusion dots 38 have the same direction (for example, the diagonal line of the bottom surface of the quadrangular pyramids is parallel or orthogonal to the incident surface 36a). . By doing so, an orderly impression and a uniform feeling can be produced as compared with the case where the directions of the diffusing dots 38 are not the same.

  When the diffusion dots 38 are formed, an ultrasonic processing horn in which a plurality of processing dots having a shape obtained by inverting the diffusion dots 38 is arranged on the front end surface in a matrix form vertically and horizontally with respect to the light guide plate 30. By pressing, a quadrangular pyramid-shaped diffusion dot 38 having a shape reflecting the shape of the processed dot can be formed.

  The light sources 44 are planar light emitting red light emitting diodes arranged on the substrate 42, and have a light emitting surface smaller than the area of the incident surface 36a. The light source 44 and the substrate 42 are fixed to a position facing the incident surface 36a by a U-shaped fixing bracket 40. The inner space between both side surfaces 40 b of the fixing bracket 40 is formed to be substantially the same as the width of the extending portion 36. For this reason, the light source 44 can be easily inserted into the light guide plate by fitting the extension portion 36 so that the both side surfaces 40b are positioned in the direction of the outer surface of the light guide plate 30 with the substrate 42 fixed to the bottom surface 40a of the fixture 40. 30 can be fixed. Moreover, since the sum of the thickness of the light guide plate 30 and the thickness of the reflecting member 50 is the thickness of the lamp 20, the lamp 20 can be arranged in a narrow space. Furthermore, since the fixture 40 is made of metal, heat generated when light is emitted from the light source 44 is easily dissipated through the substrate 42.

  The reflection member 50 is a known reflection tape or reflection sheet, is processed into the same shape as the main surface of the light guide plate 30, and is attached to one side of the main surface of the light guide plate 30. Therefore, the light diffused in the direction of the reflecting member 50 by the diffusing dots 38 is reflected again inside the light guide plate 30 by the reflecting member 50. By carrying out like this, compared with the case where it does not have the reflection member 50, the light radiate | emitted from a main surface can be made brighter.

  In addition to the shape of the light guide plate 30 described above, the shape of the light guide plate 30 may be such that the height of the extending portion 36 is shorter than the depth of the concave portion 34 as shown in FIG. In this way, it is possible to reduce the distance between the light source 44 and the inclined side 34a and the inclined side 34b while securing a region necessary for attaching the light source 44 with the fixing bracket 40, and the height of the extending portion 36 is increased. Compared to the case where the depth of the recess 34 is longer than the depth, the entire light guide plate 30 can be made brighter. Further, as shown in FIG. 4, the diffusing dots 38 may be provided only on one side of the main surface. Furthermore, it is not limited to what is formed by the two sides of the inclined side 34a and the inclined side 34b, but may be a recess having a bottom surface as shown in FIG. Furthermore, as shown in FIG. 6, the light guide plate 30 may have a substantially rectangular shape. Thus, various shapes of light can be produced depending on the shape of the light guide plate 30.

  According to the lamp 20 described in detail above, the light emitted from the light source 44 to the extending portion 36 is reflected by the inclined side 34 a and the inclined side 34 b and guided to the inside of the light guide plate 30. Emitted in the direction. At this time, since the reflecting member 50 is adhered to one side of the main surface, the opposite main surface becomes bright. In addition, since the light source 44 is fixed to the outer surface side of the extending portion 36 by the fixing bracket 40, the lamp 20 can be attached if there is a space for the thickness of the light guide plate 30. In other words, a space-saving and bright lamp can be provided.

  Further, since the area of the through hole 32 is larger than the area of the main surface of the light guide plate 30, when used as a vehicle tail lamp, the light emission area of the brake lamp disposed at the position of the through hole 32 is the light emission area of the tail lamp ( The area of the main surface of the light guide plate 30 becomes wider, so that the brake lamp can be made conspicuous for the following vehicle, and it is easier to notify the following vehicle that the brake is being used.

  Furthermore, since the recess 34 is formed by the inclined side 34a and the inclined side 34b formed so as to be perpendicular to each other, when the light incident from the extending portion 36 is reflected by the inclined side 34a or the inclined side 34b, Compared with the case where the inclined side 34a and the inclined side 34b are not formed to be at right angles to each other, the light can be guided to a farther position. In this way, light can reach a position away from the light source 44.

  Next, the lamp 60 which is 2nd embodiment is demonstrated in detail as an example of other embodiment of this invention. As shown in FIG. 7, the lamp 60 according to the second embodiment includes a light guide plate 70 having a through hole 32 at a central position and a plurality of diffusion dots 38 on both main surfaces, and a light guide plate extending from the through hole 32. A cutout portion 72 that penetrates to the outer surface of 370, a light source 44 provided in the cutout portion 72, and a reflecting member 50 attached to one side of the main surface of the light guide plate 70 are provided. In the lamp 60, light emitted from the light source 44 provided in the notch 72 is diffused by the light guide plate 70 and emitted to the main surface side of the light guide plate 70. At this time, since the reflecting member 50 is adhered to one side of the main surface, the light emitted to one side of the main surface is reflected by the reflecting member 50, passes through the light guide plate 70 again, and is on the opposite side. Exits from the main surface. By doing so, the lamp 60 has sufficient brightness.

  As shown in FIGS. 7 and 8, the light guide plate 70 is a plate-like member made of methacrylic resin, and has a through hole 32 located in the center and a notch that penetrates from the inner side surface to the outer side surface of the light guide plate 70. 72. Since the through hole 32 and the cutout portion 72 communicate with each other, the whole has a substantially C shape (substantially U shape). Moreover, between the inner surface 72a and the inner surface 72b of the notch part 72, the light source fixing member 74 to which the light source 44 is stuck on both sides via the substrate 42 is disposed, so that each of the inner surface 72a and the inner surface 72b is provided. The light source 44 is positioned at the facing position. Therefore, the light emitted from the light source 44 enters the light guide plate 70 from the inner surface 72a and the inner surface 72b, is diffused by the plurality of diffusion dots 38, and is emitted in the main surface direction. The fixing member 74 and the light guide plate 70 are fixed to each other by a fixing tool (not shown). Here, the diffusing dots 38, the light source 44, and the reflecting member 50 are the same as those in the first embodiment, and thus the description thereof is omitted. The shape of the light guide plate 70 is not limited to the shape shown in FIGS. 7 and 8, and may be a rectangular shape as shown in FIG. 9.

  According to the lamp 60 described in detail above, the light emitted from the light source 44 provided in the notch 72 is diffused by the diffusing dots 38 and emitted in the direction of the main surface of the light guide plate 70. If there is a space for installation, the lamp 60 can be installed, which contributes to space saving.

  Further, since the area of the through hole 32 is larger than the area of the main surface of the light guide plate 30, when used as a vehicle tail lamp, the light emission area of the brake lamp disposed at the position of the through hole 32 is the light emission area of the tail lamp ( The area of the main surface of the light guide plate 30 becomes larger, so that the brake lamp can be made conspicuous for the following vehicle, and it is easier to notify that the brake is being used.

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  For example, in the above-described embodiment, the light guide plate 30 and the light guide plate 70 are made of methacrylic resin. However, the light guide plate 30 and the light guide plate 70 are not particularly limited as long as they are transparent resins capable of passing through the inside. In addition to methacrylic resins such as methyl methacrylate and ethyl methacrylate, acrylic resins such as methyl acrylate and ethyl acrylate, resins such as polycarbonate and polyethylene can be used. Further, a fine particle diffusing agent capable of diffusing visible light may be added. In either case, the same effects as those of the above-described embodiment can be obtained.

  In the above-described embodiment, the outer diameter of the light guide plate 30 and the light guide plate 70 and the shape of the through hole 32 are similar to each other. However, the present invention is not limited to this, and the light guide plate 30 or the light guide plate 70 is not limited thereto. The outer diameter and the shape of the through hole 32 may be different. For example, the outer diameter of the light guide plate 30 or the light guide plate 70 may be a triangle, a quadrangle such as a trapezoid or a rhombus, or a polygon such as a pentagon, and the shape of the through hole 32 may be a circle, or the light guide plate 30 or the light guide plate. The outer diameter of 70 may be circular, and the shape of the through hole 32 may be a triangle, a quadrangle such as a trapezoid or a rhombus, a pentagon, or the like. Regardless of the combination of the shape of the light guide plate 30 or the light guide plate 70 and the through hole 32, the same effects as those of the above-described embodiment can be obtained.

  In the above-described embodiment, the light guide plate 30 and the light guide plate 70 are plate-like members, but the inner side surface and the outer side surface of the light guide plate 30 or the light guide plate 70 are one side of the main surface (diffusion of the main surface). You may incline in the direction in which the distance of an inner surface and an outer surface approaches as it goes to the side where the dot 48 is provided. In this way, light is reflected by the inclined inner side surface and outer side surface, and irradiation with stronger light becomes possible.

  In the embodiment described above, the plurality of diffusion dots 38 are provided on one side of the main surfaces of the light guide plate 30 and the light guide plate 70, but the diffusion dots 38 may not be provided. Even in such a case, for example, by mixing a diffusing agent in the light guide plate 30 and the light guide plate 70 or providing a laser processing mark or the like on the main surface, the same effect as the above-described embodiment can be obtained. Further, a groove portion surrounding the diffusing dots 38 may be formed along the outer edge of the main surface. By so doing, light is always diffused at the outer edge position of the light guide plate 30, so that the shape of the light guide plate 30 (for example, substantially circular) can be rendered more clearly.

  In the embodiment described above, the diffusing dots 38 are quadrangular pyramid-shaped concave portions, each side of the diffusing dots 38 has a length of about 0.6 mm, a depth of about 0.4 mm, and adjacent quadrangular pyramids. However, the present invention is not limited to this, and a suitable size can be selected as appropriate. The length of each side of the quadrangular pyramid-shaped diffusion dot 38 may be selected from 0.2 mm to 1.5 mm, for example. Further, the depth of the quadrangular pyramid-shaped diffusion dots 38 may be selected from 0.4 mm to 0.8 mm, for example. Furthermore, the pitch between adjacent quadrangular pyramid-shaped diffusion dots 38 may be appropriately selected from a pitch of 1.5 mm to 8.0 mm, or may be 1.5 mm to 3.0 mm. . In any case, the same effect as that of the above-described embodiment can be obtained.

  In the above-described embodiment, the diffusing dots 38 are quadrangular pyramid-shaped concave portions, but the shape and size of the diffusing concave portions formed as the diffusing dots 38 are not particularly limited. A diffusion dot 38 composed of diffusion recesses of various shapes and sizes can be used as appropriate. For example, FIG. 10B shows a diffusing dot 38 composed of a conical-side diffusing recess. FIG. 10C shows a diffusing dot 38 composed of a quadrangular prism type diffusing recess. FIG. 10D shows a diffusing dot 38 made of a quadrangular pyramid-shaped diffusing recess. FIG. 10E shows a diffusing dot 38 consisting of a hemispherical diffusing recess. In addition, as a manufacturing method, various processing methods such as ultrasonic processing, heating processing, laser processing, and cutting processing may be employed, or a method such as injection molding is used using a mold in which irregularities are engraved in advance. Also good. Moreover, for example, as shown in FIG. 10F, a convex bulging diffusion convex portion may be used. The diffusion convex portion is formed on the main surface so as to rise (clean) by clean printing, silk printing, or the like. The size of each diffusion dot 38 may be the same or different. For example, as the distance from the incident surface 36a increases, each side of the quadrangular pyramid-shaped diffusion dot 38 may be gradually lengthened, or the depth of the quadrangular pyramid-shaped diffusion dot 38 may be gradually increased. In this way, the amount of light diffused is small at a position where the light is close and strong from the light source 44, and the amount of light diffused increases as the distance from the light source 44 increases. Therefore, the amount of light emitted from the main surface can be made uniform. it can.

  In the embodiment described above, the light source 44 is a planar light emitting red light emitting diode, but is not limited to the planar light emitting diode, and may be any type such as a side light emitting type or a shell type. The light color of the light source 44 is not limited to red, and may be, for example, white, orange, yellow, green, blue, indigo or purple, or a combination of these colors. Good. Further, a white light emitting diode may be used as the light source 44, and a colored transparent film or sheet such as a red color film may be disposed between the light source 44 and the light guide plate 30 to obtain red light. In any case, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, a known reflecting tape or reflecting sheet is attached as the reflecting member 50, but the reflecting member 50 may not be provided.

  In the above-described embodiment, the light emitting surface of the brake lamp is arranged at the position of the through hole 32, and the light guide plate 30 or the light guide plate 70 can be used as a tail lamp. However, the use form is limited to this. Instead, for example, a light emitting surface of a lamp such as a tail lamp, a brake lamp, a head lamp, or an interior lamp may be arranged at the position of the through hole 32 and used as a decoration for decorating the periphery of these lamps. If it carries out like this, in addition to the conventional lamp, the lamp with the outstanding design property can be provided. Moreover, you may arrange | position on the front side of lamps, such as a tail lamp, a brake lamp, a headlamp, or an interior lamp. If it carries out like this, since it will be irradiated with the light of the lamp | ramp arrange | positioned at the rear surface side, it can illuminate brightly, providing the design property by the light-guide plate 30 or the light-guide plate 70. FIG. Furthermore, instruments such as a tachometer (rotation speed meter) and a speedometer may be arranged at the position of the through hole 32. By so doing, the surroundings of these instruments can be brightened, so that the visibility of the instruments can be improved even in a dark place such as at night.

  In the embodiment described above, the reflecting member 50 is attached to one side of the main surface. However, not only one side of the main surface but also the outer side surface, inner side surface, inclined side 34a, and inclined side of the light guide plate 30. It may be attached to either or all of the side surfaces of the side 34b and the extending portion 36. By so doing, the direction of the light emitted from the light guide plate 30 can be concentrated in one direction, so that it can be made brighter than when the reflecting member 50 is not attached.

  In the first embodiment described above, the concave portion 34 is formed by the inclined side 34a and the inclined side 34b that are perpendicular to each other. However, the angle formed by the inclined side 34a and the inclined side 34b is as follows. The angle is not limited to a right angle, and may be a desired angle such as 30 °, 45 °, or 60 °.

  In the first embodiment described above, the recess 34 is provided on the inner surface side of the light guide plate 30 and the extending portion 36 is provided on the outer surface side of the light guide plate 30. The extending portion 36 may be provided on the inner surface side of the light guide plate 30. Even in this case, the same effect as the above-described embodiment can be obtained.

  In the first embodiment described above, one recess 34 and one extension 36 are provided, but two or more may be provided. By arranging the light source 44 at a position opposite to each incident surface 36a, the irradiated light can be brightened.

  In the first embodiment described above, the diffusing dots 48 are provided on the entire main surface including the surface of the extending portion 36, but the diffusing dots 48 are provided on the surface of the extending portion 36. Not necessary. Also in this case, the same effect as the above-described embodiment can be obtained.

  In the second embodiment described above, one notch 72 is provided, but a plurality of notches 72 may be provided. By providing the light source 44 in each notch part 72, the light irradiated more can be made brighter.

  As shown in the above-described embodiment, it can be used as a lighting field, particularly as a lamp.

20 ... lamp, 30 ... light guide plate, 32 ... through hole, 34 ... concave, 34a ... inclined side,
34b ... inclined side, 36 ... extension part, 36a ... incident surface, 38 ... diffusion dot,
40 ... Fixing bracket, 40a ... Bottom, 40b ... Side, 42 ... Substrate, 44 ... Light source,
48 ... diffusing dots, 50 ... reflecting member, 60 ... lamp, 70 ... light guide plate,
72 ... Notch, 72a ... Inner surface, 72b ... Inner surface, 74 ... Light source fixing member.

Claims (11)

A light guide plate that mainly emits light emitted from a light source from a main surface,
A through hole located at the center of the main surface;
A recess formed on the inner surface of the light guide plate and recessed in the direction of the outer surface of the light guide plate;
Formed on the opposite side of the recess, extending in the direction of the outer surface of the light guide plate, and an extension part on which the light is incident,
Characterized by comprising,
Light guide plate. The light guide plate according to claim 1,
A plurality of diffusion dots provided on at least one side of the main surface and diffusing the light;
Characterized by comprising,
Light guide plate. The area of the through hole is wider than the area of the main surface,
The light guide plate according to claim 1 or 2. The height of the extending part is lower than the depth of the concave part,
The light guide plate according to claim 1. The concave portion is formed by a pair of inclined sides formed so as to be perpendicular to each other.
The light guide plate according to any one of claims 1 to 4. The light guide plate according to any one of claims 1 to 5,
A light source provided on the outer surface side of the light guide plate at a position facing the extension portion;
Characterized by comprising
Light fixture. A light guide plate that mainly emits light emitted from a light source from a main surface,
A through hole located at the center of the main surface;
A notch penetrating from the inner surface of the light guide plate to the outer surface of the light guide plate;
With
The light is applied to the inner surface of the notch,
Light guide plate. The light guide plate according to claim 7,
A plurality of diffusion dots provided on at least one side of the main surface and diffusing the light;
Characterized by comprising,
Light guide plate. The area of the through hole is wider than the area of the main surface,
The light guide plate according to claim 7 or 8. The light guide plate according to any one of claims 7 to 9,
A light source for irradiating light to the inner surface of the notch,
Characterized by comprising
Light fixture. The lamp according to claim 6 or 10, wherein
The plurality of diffusion dots are provided on both sides of the main surface,
A reflective member that reflects light is provided on one side of the main surface,
Light fixture.

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