JP6760728B2 - Light emitting device - Google Patents

Description

The present invention relates to a light emitting device.

Conventionally, various light emitting devices for displaying a deep image have been proposed. For example, it is provided with an incident surface, a reflecting surface formed with a reflecting region in the shape of an image to be displayed, a light guide plate having an emitting surface, and a light source located in front of the incident surface, from the incident surface. It is a light emitting device configured to display an arbitrary image through the emitting surface by reflecting the incident light forward in the emitting direction by the reflecting surface, and is located behind the light guide plate in the emitting direction. A half that is located in front of the light guide plate in the emission direction, reflects a part of the light traveling from the rear in the emission direction to the rear in the emission direction, and transmits the other part to the front in the emission direction. Some are provided with a mirror (Patent Document 1).

According to this light emitting device, it is manifested as a plurality of images superimposed at equal pitches in the thickness direction of the light guide plate. Therefore, there is an effect that a deep image can be displayed while reducing the thickness of the light emitting device.

As a similar means, for example, (1) a half mirror having a reflectance of 10 to 30% of 1.5 tons from the exit surface side, or a 1.5 ton acrylic plate engraved with characters, patterns, etc. on the front or back surface. , A display device in which 0.2t film-like mirror surface members are laminated and arranged. (2) From the exit surface side, a mirror surface material is deposited on the front surface with a reflectance of about 10% to 50%, and an acrylic plate engraved with characters, patterns, etc. on the back surface, and a 0.2t film-like mirror surface member. Display devices arranged in layers. (3) A mirror surface material such as aluminum is vapor-deposited on the front surface with a reflectance of about 10% to 50%, characters, patterns, etc. are engraved on the back surface side, and the mirror surface material is vapor-deposited on the engraved back surface. A display device consisting of a single acrylic plate, etc. has been proposed.

However, according to such a light emitting device, since the reflection surface and the reflection region are provided only on the back side of the light guide plate, display information such as alphabets in the reflection region is arranged on the back side of the light guide plate and is transmitted through the light guide plate. Since it is visually recognized from the front side, there is a problem that the image is not clear.

Japanese Unexamined Patent Publication No. 2008-145675

The present invention has been made in view of such a problem, and can display the display information clearly, and emit more uniform light from the exit portion to make the brightness of the display information uniform. The main purpose is to provide a light emitting device that can be used.

The present invention has adopted the following means in order to achieve the above-mentioned main object.

The light emitting device according to the present invention is
A light guide plate that emits light incident from the side surface mainly to the front side,
A plurality of light source members arranged on the side surface of the light guide plate, and
A half mirror that is arranged on the front side of the light guide plate, emits a part of the traveling light, emits it from the front side, and reflects other light to the back side.
A rear mirror surface portion provided on the back surface of the light guide plate and
With
The light guide plate is characterized in that an optical display unit that displays information by light is provided on the front side.

According to the light emitting device according to the present invention, the image of the display information displayed on the display unit reciprocates light between the half mirror and the rear mirror surface portion, and is substantially perpendicular to the front surface (front direction and depth direction). ) Can be visually recognized as if they are arranged continuously, giving the impression that the image continues in the depth direction. At this time, since the display information is displayed by the light display unit provided on the front side of the light guide plate, the display information can be directly visually recognized without going through the light guide plate as in the case where the display information exists on the back side of the light guide plate. Since it can be displayed, the display information can be displayed clearly. Further, since the display information itself is an image formed by light, the display information can be bright. Further, by incident light from the side surface side of the light guide plate, diffusing the incident light, and then emitting the incident light from the light display unit on the front side, uniform and even light can be emitted from the light display unit. it can.

Further, in the light emitting device according to the present invention,
A light guide plate that emits light incident from the side surface mainly to the front side,
A plurality of light source members arranged on the side surface of the light guide plate, and
A half mirror that is arranged on the front side of the light guide plate, emits a part of the traveling light, emits it from the front side, and reflects other light to the back side.
A rear mirror surface portion provided on the back surface of the light guide plate and
With
The light guide plate may be characterized in that light display units for displaying information by light are provided on the front side and the back side.

According to the light emitting device according to the present invention, the image of the display information displayed on the display unit is substantially perpendicular to the front surface (front side) as the light reciprocates between the half mirror and the rear mirror surface unit. It can be visually recognized by the viewer as if they are arranged continuously in the direction and the depth direction, and can give the impression as if the image continues in the depth direction. At this time, since the display information is displayed by the optical display units provided on both the front side and the back side of the light guide plate, the display information on the front side and the display information on the back side of the light guide plate have different senses of depth. Information can be provided.

Further, in the light emitting device according to the present invention, the front side of the light guide plate is characterized by having a front mirror surface portion provided in a portion other than the light display portion that displays information by light. You may. By adopting such a configuration, the image of the light display unit by the light emitted from the light display unit reciprocates the light between the front mirror surface portion and the half mirror, and is perpendicular to the upper surface (front direction or depth). It can be visually recognized as if they are arranged continuously in the direction), and can give the impression that the vertical plane continues in the depth direction.

Further, the light emitting device according to the present invention may be characterized in that a reflector is provided in place of or in addition to the back mirror surface portion. By adopting such a configuration, a light emitting device can be manufactured using a light guide plate having no rear mirror surface portion.

Further, in the light emitting device according to the present invention, the light display unit may be characterized in that it is formed on a surface capable of diffusing light. That is, as the light display unit, only the display unit is formed on a surface on which light is diffused, for example, a rough surface formed by laser processing, and the rough surface portion diffuses light so that it looks brighter than the surroundings.

Further, the light emitting device according to the present invention may be characterized in that the rear mirror surface portion is provided with a reflection display portion for displaying display information. By adopting such a configuration, display information can be provided on the back side of the light guide plate.

Further, in the light emitting device according to the present invention, the reflection display unit may be manufactured in a light transmitting region and may be formed in the same manner as the light display unit on the back surface side. By adopting such a configuration, the light display unit on the back side is displayed by the light from the back surface, so that a brighter light display unit can be obtained.

Further, the light emitting device according to the present invention may be characterized in that a phosphorescent portion is provided on the back surface of the light guide plate or between the light guide plate and the reflector. By adopting such a configuration, it is possible to function as a light emitting device for a while by emitting light from the phosphorescent unit even after the LED is turned off.

Further, the light emitting device according to the present invention may be characterized in that diffusion dots are formed on the back surface of the light guide plate. By adopting such a configuration, the light is diffused in the light guide plate, so that more uniform and even light can be emitted from the light display unit.

Further, in the light emitting device according to the present invention, the side surface of the light guide plate may have a concave portion formed in a concave shape at a position corresponding to a portion where the light source member is arranged. .. By adopting such a configuration, the light incident on the light guide plate can be diffused by the recesses, and more uniform light can be emitted from the emitting portion.

Further, in the light emitting device according to the present invention, the front mirror surface portion may be integrated with the light guide plate. By adopting such a configuration, it is not necessary to arrange the front mirror surface portion, so that a thinner light emitting device can be provided.

Further, in the light emitting device according to the present invention, the front mirror surface portion may be characterized in that the center is bulging or dented. By adopting such a configuration, when the light emitting device is visually recognized, the image of the light display unit can be made to appear to spread toward the back or conversely to converge to the center. it can.

Further, in the light emitting device according to the present invention, the half mirror may be characterized in that the center is bulging or dented. By adopting such a configuration, when the light emitting device is visually recognized, the image of the light display unit can be made to appear to spread toward the back or conversely to converge to the center. it can.

FIG. 1 is an exploded perspective view of the light emitting device 100 according to the first embodiment as viewed from the front side. FIG. 2 is a partially enlarged cross-sectional view of the light emitting device 100 according to the first embodiment. FIG. 3 is an exploded perspective view showing another embodiment of the light emitting device 100 according to the first embodiment as viewed from the front side. FIG. 4 is a schematic view showing a visual state of the light emitting device 100 according to the first embodiment. FIG. 5 is an exploded perspective view of the light emitting device 100 according to the first embodiment as viewed from the front side. FIG. 6 is a perspective view showing the form of the diffusion dot 39. FIG. 7 is a partially enlarged cross-sectional view of the light emitting device 100 according to the first embodiment. FIG. 8 is a schematic view showing a visual state of the light emitting device 100 according to the first embodiment. FIG. 9 is an exploded perspective view of the light emitting device 100 according to the second embodiment as viewed from the front side. FIG. 10 is an exploded perspective view of the light emitting device 100 according to the third embodiment as viewed from the front side. FIG. 11 is a perspective view of the half mirror 40 according to the fourth embodiment. 12A and 12B are cross-sectional views of the half mirror according to the fourth embodiment. FIG. 13 is a perspective view of the front mirror surface portion according to the fifth embodiment and a cross-sectional view of the CC portion. FIG. 14 is a perspective view showing a modified example of the cover member 80 in each embodiment. FIG. 15 is a perspective view showing a modified example of the light emitting device 100 in each embodiment.

An embodiment of the light emitting device 100 according to the present invention will be described in detail with reference to the drawings. The embodiments and drawings described below exemplify a part of the embodiments of the present invention, are not used for the purpose of limiting to these configurations, and do not deviate from the gist of the present invention. Can be changed as appropriate in. The corresponding components in each figure are designated with the same or similar reference numerals. In the present specification, the "front side" means the side visually recognized by a person, the "back side" means the side opposite to the front side, and the "front side" means the surface of each member.

(First Embodiment)
The light emitting device 100 according to the first embodiment is shown in FIG. FIG. 1 is an exploded perspective view of the light emitting device 100 according to the first embodiment as viewed from the front side. The light emitting device 100 according to the first embodiment mainly includes a reflector 50, a light guide plate 30, a half mirror 40, and a light source member 10 that incidents light on the light guide plate 30.

The light source member 10 is formed by arranging a plurality of light emitting diodes (hereinafter referred to as "LED 12") on the substrate 14. The light source member 10 is arranged on the side surface of the light guide plate 30, and light is incident into the light guide plate 30 from the side surface of the light guide plate 30. The light source member 10 may be arranged on one side surface or may be arranged on a plurality of side surfaces. In the first embodiment, they are arranged on opposite side surfaces. As shown in FIG. 2, the light source member 10 is attached to a channel member 15 having a substantially U-shaped cross section to which the light guide plate 30, the half mirror 40, and the reflector 50 can be fixed at the same time. The LED 12 may be of any type such as a flat light emitting type, a side light emitting type, and a bullet type. Preferably, a flat light emitting type LED 12 is used. The color of the light of the LED 12 is not limited, and may be, for example, any color of white, red, orange, yellow, green, blue, indigo, or purple, or a combination thereof. As shown in FIG. 1, the LED 12 may be a long substrate 14 to which a plurality of LEDs 12 are attached, or may be individually attached to the substrate (see FIG. 5). Further, a power supply unit (not shown) that supplies electric power to the LED 12 may be provided depending on the type of power source and the like. As a power supply unit, in order to match the power input from the outside to the rating of the LED 12, step-down, rectification to a constant DC current, pulse modulation after rectification, noise removal, etc. are performed, and drive power is supplied to the LED 12. Therefore, for example, some are composed of a transformer, a rectifier, a capacitor, and the like. The light source is not limited to the LED 12.

The light guide plate 30 is made of a transparent resin or glass that allows light to pass through the inside. For example, in addition to a methacrylic resin such as methyl methacrylate or ethyl methacrylate, an acrylic resin such as methyl acrylate or ethyl acrylate, polycarbonate, etc. Various materials such as polyethylene and glass can be used. The material is not particularly limited as long as it is a transparent material. The thickness of the light guide plate is not limited, but is 5 mm or more in order to effectively exert the difference in the sense of depth between the light display unit 31 on the front side and the light display unit 32 on the back side, which will be described later. It is preferable to use the light guide plate 30 having the above.

On the front surface of the light guide plate 30, there is an optical display unit 31 on the front side that has display information such as characters, figures, and patterns. For the light display unit 31 on the front side, for example, the surface of the light guide plate 30 may be roughened by laser processing, grinding, or the like so that the rough surface portion diffuses light and becomes brighter than the surroundings. With such a configuration, the light incident from the side surface of the light guide plate 30 is diffused by the light display unit 31 on the front side to emit light brighter than the surroundings. As a result, the viewer on the front side can visually recognize the display information such as characters, figures, and patterns.

Further, the back side of the light guide plate 30 has a back mirror surface portion 38 that has been mirror-finished by a method such as vapor deposition, and the light that hits the back surface is reflected to the front side. The back side also has a light display unit 32 on the back side. Similar to the light display unit 31 on the front side, the light display unit 32 on the back side may also have a rough surface on the surface of the light guide plate 30 by laser processing, grinding, or the like. By adopting such a configuration, the light incident from the side surface of the light guide plate 30 is diffused by the light display portion on the back surface side to emit light brighter than the surroundings. As a result, the viewer on the front side can visually recognize the display information such as characters, figures, and patterns. At this time, since the positions where the light display unit 31 on the front side and the light display unit 32 on the back side are displayed by the thickness of the light guide plate 30, that is, the depths are different, each image has a different sense of depth. Can be visually recognized as. The light reciprocates due to the reflection by the half mirror 40 and the reflection by the rear mirror surface portion 38, which will be described later, so that the display information is visually recognized overlapping in the depth direction. As described above, according to the light emitting device 100 of the first embodiment, the image can be displayed as an image having a depth many times as large as the thickness of the light emitting device 100 itself.

Further, a phosphorescent portion 60 is provided on the back surface side of the light guide plate 30. The phosphorescent portion 60 is formed by arranging a phosphorescent sheet on the back side of the light guide plate 30. By providing the phosphorescent unit 60, the display information of the light display unit 32 on the back side can be displayed by the light emitted from the phosphorescent unit 60 for a while even when the light source member 10 is turned off at night or the like. it can. As the phosphorescent unit 60, the phosphorescent paint may be applied to the portion of the light display unit 32 on the back side. Further, a phosphorescent sheet may be arranged on the light display unit 31 on the front side, or a phosphorescent paint may be applied.

The half mirror 40 is a member that transmits a part of the light emitted from the light guide plate 30 or the light reflected from the reflector 50 on the back surface side and reflects the remaining light. For example, very thin metals such as gold, silver, copper, aluminum, chromium, nickel, titanium, and tin, alloys containing these metals, metal compounds, etc. are thinly vapor-deposited or sputtered on the surface of a transparent glass or resin sheet. It is recommended to use a coated one. It should be noted that not only a member in which all light is divided into reflection and transmission, but also a member in which a part of light is absorbed may be used. Further, a protective layer such as a hard coat layer may be formed on the surface of the half mirror 40. The half mirror 40 may have a space between it and the light guide plate 30, or may be arranged in close contact with the light guide plate 30.

The reflector 50 is arranged on the back surface of the light guide plate 30, and has a function of reflecting the emitted light and reintroducing the light into the light guide plate 30 when the light is emitted from the back surface side of the light guide plate 30. As a result, it is possible to reduce the light emitted from the back side and being attenuated, and the light can be efficiently emitted from the front side. The reflector 50 itself is not particularly limited, and a white plate, a mirror-finished plate, or the like can be used. The light display unit 51 may be provided on the reflector 50 itself.

Further, the cover member 80 and the shielding member 90 may be optionally provided. The cover member 80 is made of various materials having high permeability such as methacrylic resin such as methyl methacrylate and ethyl methacrylate, acrylic resin such as methyl acrylate and ethyl acrylate, and polycarbonate, polyethylene and glass. The cover member 80 has a function of protecting the surface of the half mirror 40.

The shielding member 90 is made of an opaque material, and is arranged on the front side of the light source member 10 so that the light source member 10 and the like are difficult to see or cannot be seen from the front when viewed from the front. It is a member for shielding. As a result, the light source member 10 and the like can be shielded and prevented from being visually recognized from the front, and the light emitting device 100 having excellent aesthetics can be obtained.

According to the light emitting device 100 manufactured as described above, when the light source member 10 is turned on, light is incident from the side surface of the light guide plate 30, and a part of the light is emitted from the front surface. A part of the emitted light reaches the half mirror 40. A part of the light reaching the half mirror 40 is transmitted through the half mirror 40 and emitted to the outside of the light emitting device 100, and a part or all of the light not transmitted through the half mirror 40 is directed toward the rear mirror surface portion 38. Is reflected. Since the rear mirror surface portion 38 reflects almost all of the received light, the light reflected by the rear mirror surface portion 38 is reflected back to the half mirror 40. A part of this light is transmitted through the half mirror 40, and the other part is reflected again by the half mirror 40. Similarly, by repeating transmission and reflection by the incident half mirror 40 and reflection by the rear mirror surface portion 38, the light display portions 31 and 32 of the light guide plate 30 are as if the light emitting device 100 is shown in FIG. It is visualized by a half mirror 40 that functions as a display surface as a plurality of images that are continuous at equal pitches in the depth direction of. At this time, as shown in FIG. 2, the positions of the light display units 31 and 32 on the front side and the light display unit 32 on the back side are different from each other, and the light reaches the eyes. Since the lengths of the paths are different, the light display unit 31 on the front side and the light display unit 32 on the back side can simultaneously display two display information having different senses of depth. Therefore, the display information can be displayed more three-dimensionally. As described above, according to the light emitting device 100 of the first embodiment, it is possible to display an image having a depth many times as large as the thickness of the light emitting device 100 itself, and simultaneously display images having different feelings of depth. Can be done.

Further, since the light emitting unit 60 is provided on the back side of the light guide plate 30, even when the light source member 10 is turned off at night or the like, the light emitting unit 60 emits light to display the light display unit for a while. be able to.

Further, since it is possible to reduce the direct emission of the light from the light source member 10, the light emitted from the light display unit 31 can be made uniform. Therefore, unevenness of the light emitted from the light display unit 31 can be reduced.

In the first embodiment, the light display units 31 and 32 are formed on a rough surface, but for example, only the light display units 31 and 32 pass light with a portion other than the light display units 31 and 32 as an opaque portion. Even so, the display function can be secured.

(Second Embodiment)
The light emitting device 100 according to the second embodiment is shown in FIG. FIG. 5 is an exploded perspective view of the light emitting device 100 according to the first embodiment as viewed from the front side. The light emitting device 100 according to the first embodiment mainly includes a reflector 50, a light guide plate 30 having a front mirror surface portion 20, a half mirror 40, a cover member 80, and a shielding member 90 from below. Further, it has a light source member 10 for incident light on the light guide plate 30.

In the light source member 10, a plurality of light emitting diodes (hereinafter referred to as "LED 12") are arranged on the substrate 14. A plurality of light source members 10 are arranged along the side surface of the light guide plate 30, and light is incident into the light guide plate 30 from the side surface of the light guide plate 30. The LED 12 may be of any type such as a flat light emitting type, a side light emitting type, and a bullet type. Preferably, a flat light emitting type LED 12 is used. The color of the light of the LED 12 is not limited, and may be, for example, any color of white, red, orange, yellow, green, blue, indigo, or purple, or a combination thereof. As shown in FIG. 5, the LEDs 12 may be individually attached, or a plurality of LEDs 12 may be attached to a long substrate 14. Further, a power supply unit (not shown) that supplies electric power to the LED 12 may be provided depending on the type of power supply and other mounting methods. As a power supply unit, in order to match the power input from the outside to the rating of the LED 12, step-down, rectification to a constant DC current, pulse modulation after rectification, noise removal, etc. are performed, and drive power is supplied to the LED 12. Therefore, for example, some are composed of a transformer, a rectifier, a capacitor, and the like. The light source is not limited to the LED.

The front mirror surface portion 20 is provided with a mirror surface material on the front side of the light guide plate 30 described later, and the surface on the front side can reflect light, and the light reflected by the half mirror 40 described later is again reflected on the front side. It has a function of reflecting on. The method of forming the light display unit 22 on the front mirror surface portion 20 is not limited. For example, it can be produced by metal vapor deposition or metal plating. Further, a part of the front mirror surface portion 20 is provided with an optical display unit 22 that emits light from the light guide plate 30, and display information such as characters, figures, and patterns can be displayed depending on the shape of the light display unit 22. The display information to be displayed is displayed. In the first embodiment, the characters "ABCD" are represented as an example of display information. The light display unit 22 may be provided with various diffusion or refraction means in order to make the light display unit 22 more visible. For example, the light display unit 22 may be formed on a rough surface or diffuse dots may be provided. By forming the light display unit 22 on a rough surface, diffuse reflection and diffusion occur on the surface of the light display unit 22, and the surface of the light display unit 22 appears to shine brightly. As a result, continuous images in the depth direction can be visually recognized brighter. In order to form the light display portion 22 on a rough surface, for example, it may be scraped with sandpaper or a file, processed with a laser, or the surface may be scratched by sandblasting. Further, the light display unit 22 may be colored with transparent ink or the like. As a method for producing the light display unit 22, the mirror surface material deposited by laser processing or the like may be removed, or the mirror surface material may be attached to the shape of the display information in advance and then the mirror surface material may be other than the masking tape. The transparent plate member on which the mirror surface material is not vapor-deposited may be exposed by vapor-depositing the portion and then peeling off the masking tape. If the mirror surface material is removed by laser processing, the surface of the exposed transparent plate member is formed as a rough surface, so that light emission becomes easier.

The light guide plate 30 is made of a transparent resin or glass that allows light to pass through the inside. For example, in addition to a methacrylic resin such as methyl methacrylate or ethyl methacrylate, an acrylic resin such as methyl acrylate or ethyl acrylate, polycarbonate, etc. Various materials such as polyethylene and glass can be used. The material is not particularly limited as long as it is a material having high transparency.

The back surface of the light guide plate 30 may be a smooth surface without any processing, but in order to improve reflection or diffusion, diffusion dots (circled portion in FIG. 5: the shape of the back surface of the light guide plate is shown). ) May be provided, or grain processing may be provided. The diffusion dots 39 are mainly formed in the recesses. The shape of the recess is not particularly limited, and as shown in FIG. 6, a quadrangular pyramid shape (FIG. 6A), a conical shape (FIG. 6B), a triangular pyramid shape (FIG. 6C), a quadrangular pyramid shape (FIG. 6D) and Various hole shapes such as a hemispherical shape (FIG. 6E) can be selected. The method for producing the diffusion dot 39 is not particularly limited, and various processing methods such as ultrasonic processing, heat processing, laser processing, and cutting processing can be adopted. When the quadrangular pyramid-shaped diffusion dots 39 are produced by ultrasonic processing, an ultrasonic processing horn in which a plurality of processing dots having a shape in which the diffusion dots 39 are inverted on the tip surface are arranged vertically and horizontally in a matrix is used. By pressing the light guide plate 30 perpendicularly, a quadrangular pyramid-shaped diffusion dot 39 having a shape reflecting the shape of the processed dot can be formed. In the present embodiment, the diffusion dot 39 is composed of recesses recessed in a substantially quadrangular pyramid shape, and is 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 30. The size of each diffusion dot 39 may be the same or different. For example, as the distance from the LED 12 increases, each side of the quadrangular pyramid-shaped diffusion dot 39 may be gradually lengthened, or the depth of the quadrangular pyramid-shaped diffusion dot 39 may be gradually increased. In this way, the amount of diffused light decreases at a position close to the LED 12 and the light is strong, and the amount of diffused light increases as the distance from the light source member 10 increases, so that the amount of emitted light can be made evenly close. Further, the large diffusion dots 39 may be formed only in the portion where the light is to be emitted more strongly, or the diffusion dots 39 having a different shape may be formed only in a part so that only a part has a different appearance. Good. In the present embodiment, the length of each side of the diffusion dots 39 is about 0.6 mm and the depth is about 0.4 mm, and the pitch between the adjacent quadrangular pyramid-shaped diffusion dots 39 is formed to be 2.0 mm. .. Of course, the size is not limited to this, and a suitable size can be appropriately selected. Preferably, the length of each side of the quadrangular pyramid-shaped diffusion dot 39 may be selected from 0.2 mm to 1.5 mm. The depth of the quadrangular pyramid-shaped diffusion dots 39 may be selected from 0.4 mm to 0.8 mm. Further, the pitch between adjacent quadrangular pyramid-shaped diffusion dots 39 is not particularly limited, and for example, a pitch of 1.5 mm to 8.0 mm can be appropriately selected. Preferably, it is produced at a pitch of 1.5 mm to 3.0 mm.

The shape of the diffusion dot 39 is not limited to the concave recess, and may be a convex bulging diffusion convex portion (FIG. 6F). The diffusion convex portion may be formed so as to be raised (convex) by screen printing, silk printing, or the like.

When the diffusion dot 39 is produced, not only the post-processing method described above but also a mold such as an injection prepared so that the diffusion dot 39 can be molded in advance is used to form the light guide plate 30. Diffusion dots 39 may be molded at the same time as molding.

The half mirror 40 is a member that transmits a part of the light emitted from the light guide plate 30 or the light reflected from the front mirror surface portion 20 on the back side and reflects a part or all of the remaining light. For example, very thin metals such as gold, silver, copper, aluminum, chromium, nickel, titanium, and tin, alloys containing these metals, metal compounds, etc. are thinly vapor-deposited or sputtered on the surface of a transparent glass or resin sheet. It is recommended to use a coated one. It should be noted that not only a member in which all light is divided into reflection and transmission but also a member in which a part of light is absorbed may be used. Further, a protective layer such as a hard coat layer may be formed on the surface of the half mirror 40.

The reflector 50 is arranged on the back surface of the light guide plate 30, and when light is emitted from the back side of the light guide plate 30, it reflects the light and is reintroduced into the light guide plate 30. As a result, the light can be efficiently emitted from the light display unit 22 on the front side. The reflection plate 50 itself is not particularly limited, and various materials such as a white plate material having a high reflection function and a mirror-finished plate can be used. Further, the function of the heat radiating plate may be added by using a metal plate or the like.

The cover member 80 is made of various materials having high permeability such as methacrylic resin such as methyl methacrylate and ethyl methacrylate, acrylic resin such as methyl acrylate and ethyl acrylate, and polycarbonate, polyethylene and glass. The cover member 80 has a function of protecting the surface of the half mirror 40 and a function of adjusting the sense of depth by adjusting the distance from the half mirror 40. That is, when the distance between the half mirror 40 and the cover member 80 is widened, the image of the light display unit 22 can be visually recognized on the back side, and when the distance between the half mirror 40 and the cover member 80 is narrowed, the light display unit 22 is closer to the front side. You can see the image of.

The shielding member 90 is made of an opaque material, and is arranged on the front side of the light source member 10 so that the light source member 10 and the like are difficult to see or cannot be seen from the front when viewed from the front. It is a member for shielding. As a result, the light source member and the like are shielded to prevent them from being visually recognized from the front.

As shown in FIGS. 5 and 7, the light emitting device 100 configured in this way is arranged in the order of the reflector 50, the light guide plate 30, the half mirror 40, the cover member 80, and the shielding member 90 from the back side, and the light guide plate 30. A light source member 10 is arranged on the side surface. The front mirror surface portion 20 and the half mirror 40 are arranged apart from each other, and a space α in which light reciprocates is formed between them. In the first embodiment, the light source member 10 is arranged over the entire circumference, but the light source member 10 may be arranged on only one side, or may be arranged on two or three sides. ..

According to the light emitting device 100 manufactured as described above, when the light source member 10 is turned on, light is incident on the light guide plate 30, and most of the light is emitted from the light display unit 22. A part of the emitted light reaches the half mirror 40. Part of the light that has reached the half mirror 40 is transmitted through the half mirror 40 and emitted to the outside of the light emitting device 100, and part or all of the light that has not passed through the half mirror 40 is directed to the front mirror surface portion 20 side. It is reflected toward. Since the front mirror surface portion 20 reflects almost all of the received light, the light reflected by the half mirror 40 is reflected back to the half mirror 40. A part of this light is transmitted through the half mirror 40, and the other part is reflected again by the half mirror 40. Similarly, by repeating transmission and reflection by the incident half mirror 40 and reflection by the front mirror surface portion 20, the light display portion 22 of the light guide plate 30 is as if the depth of the light emitting device 100 is as shown in FIG. It is visualized by a half mirror 40 that functions as a display surface as a plurality of images that are continuous at equal pitches in the directions. In other words, the same pattern of a plurality of light display units 22 can be multiplexed and visually recognized as if they exist in the depth direction. That is, a part of the light from the light source member 10 is incident on the space α from the light display unit 22, and the incident light is emitted from the portion of the ABCD from which the mirror surface material has been removed. Therefore, the characters of ABCD are shining and visually recognized. Further, the light emitted from the portion of the ABCD from which the mirror surface material has been removed is emitted into the space α arranged between the front mirror surface portion 20 and the half mirror 40. Therefore, as shown in FIG. 8, when the characters are visually recognized from the front, the characters of ABCD are shining and visually recognized, and the characters are visually recognized overlapping in the depth direction. As described above, according to the light emitting device 100 of the first embodiment, the image can be displayed as an image having a depth many times as large as the thickness of the light emitting device 100 itself.

At this time, since the light source member 10 is arranged on the side surface side with respect to the light guide plate 30, the thickness of the light emitting device 100 can be reduced as compared with the case where the light source member 10 is arranged on the back surface side. .. Further, since the light source member 10 is not arranged on the back side when visually recognized from the front, the possibility that the light source is directly viewed can be reduced. Further, since it is possible to reduce the direct emission of the light from the light source member 10, the light emitted from the light display unit 22 can be made uniform. Therefore, unevenness of the light emitted from the light display unit 22 can be reduced.

(Third Embodiment)
The light emitting device 100 according to the third embodiment is shown in FIG. As shown in FIG. 9, the light emitting device 100 according to the third embodiment is different from the first embodiment in that the front mirror surface portion 20 is not integrated with the light guide plate 30 but uses a mirror surface member which is a separate member. .. For example, it can be achieved by arranging a mirror surface sheet, a mirror surface plate, or the like on the upper surface of the light guide plate. Since other points are the same as those of the first embodiment, the description thereof will be omitted.

By making the front mirror surface portion 20 a separate member from the light guide plate 30 and replacing it with the front mirror surface portion 20 having different display information, it is possible to manufacture a light emitting device 100 having various display information. Therefore, the configuration other than the front mirror surface portion 20 can be a common component, and the light emitting device 100 with high versatility can be obtained.

(Fourth Embodiment)
The light emitting device 100 according to the fourth embodiment is shown in FIG. As shown in FIG. 10, the light emitting device 100 according to the fourth embodiment has a recess 35 formed in the vicinity of a portion of the light guide plate 30 where the light source member 10 is arranged. Since other configurations are the same as those of the second embodiment, the description thereof will be omitted.

By providing the recess 35, the recess 35 functions as a lens, and the light emitted from the LED 12 is incident so as to be diffused in the light guide plate 30. Therefore, the light becomes more uniform, and the unevenness of the light emitted from the light display unit 22 can be reduced. Note that FIG. 10 shows a state in which the recess 35 is cut out like a part of a columnar shape, but the present invention is not limited to this. For example, it may be a hemispherical recess 35 or the like.

(Fifth Embodiment)
A perspective view of the half mirror 40 of the light emitting device 100 according to the fifth embodiment is shown in FIG. 11, and a cross-sectional view is shown in FIG. The half mirror 40 according to the fourth embodiment is different from the first embodiment or the second embodiment in that the half mirror 40 has a curved surface whose center is gently curved. Other configurations are the same as those of the first embodiment or the second embodiment. As shown in FIG. 12A, the curvature may be a form in which the center is bulged or dented like the surface of a lens, or as shown in FIG. 12B, a part of a cylinder in which a plate material or a sheet is bent from both sides. It may be in the form of a surface. By using the half mirror 40 having such a configuration, the distance between the front mirror surface portion 20 and the half mirror 40 becomes narrow in the portion where the half mirror 40 is arranged close to the front mirror surface portion 20 side, so that the light display unit 22 When the mirrors appear to overlap in the depth direction, the overlap width can be made narrower than in the case where the half mirror 40 is flat. In the portion where the half mirror 40 is arranged farther from the front mirror surface portion 20, the distance between the front mirror surface portion 20 and the half mirror 40 becomes wide, so that when the light display portion 22 appears to overlap in the depth direction, the half mirror Compared with the case where 40 is a flat surface, the overlapping width can be visually recognized wider. Also, if the center is gently bulging or dented, by reversing the bulging direction on the front side and the back side, it looks as if it spreads toward the back, or conversely converges to the center. You can make it look like you are going.

(Sixth Embodiment)
The front mirror surface portion 20 of the light emitting device 100 according to the sixth embodiment is shown in FIG. In the front mirror surface portion 20 according to the sixth embodiment, the center of the light guide plate 30 is formed in a concave shape, and the front mirror surface portion 20 is concave like the half mirror 40 described in the fourth embodiment or the fifth embodiment described above. Is formed in. In FIG. 13, an example having a curved surface in which the center is gently curved is shown, but conversely, the center may be formed so as to protrude one step and bulge. By adopting such a configuration, if the center is gently bulging or dented, the bulging direction can be reversed on the front side and the back side to make it appear to spread toward the back. On the contrary, it can be made to appear to converge to the center.

It should be noted that those having a concave portion at the center of both the front mirror surface portion 20 and the half mirror 40 or those having a gently curved curved surface may be used. By these combination methods, when the light emitting device 100 is visually recognized, the light display unit 22 can be visually recognized by being complicatedly converged, expanded, or bent.

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

In the above-described embodiment, the cover member 80 and the shielding member 90 are manufactured as separate members, but as shown in FIG. 14, an integral body having a transparent cover portion 80a in the center and an opaquely formed shielding portion 90a around the periphery. The cover member 80 may be used.

Further, in each of the above-described embodiments, the light emitting device 100 such as the front mirror surface portion 20 and the half mirror 40 may be integrated with the object by assembling to the object itself to which the light emitting device 100 itself is attached. For example, as shown in FIG. 15, the console box 1 of the automobile and the light emitting device 100 may be integrally attached. In addition, the light emitting device 100 may be directly assembled to the door trim, the dashboard, or the like to be integrally formed.

As shown in the above-described embodiment, it can be used as a light emitting device.

10 ... light source member, 12 ... LED, 14 ... substrate, 15 ... channel member, 20 ... front mirror surface part, 22 ... light display unit, 30 ... light guide plate, 31 ... light display unit, 32 ... light display unit, 38 ... back Mirror surface part, 39 ... diffused dot, 40 ... half mirror, 50 ... reflector, 51 ... light display part, 60 ... phosphorescent part, 80 ... cover member, 80a ... cover part, 90 ... shielding member, 100 ... light emitting device

Claims (9)

A light guide plate that emits light incident from the side surface mainly to the front side,
A plurality of light source members arranged on the side surface of the light guide plate, and
A half mirror that is arranged on the front side of the light guide plate, emits a part of the traveling light, emits it from the front side, and reflects other light to the back side.
A rear mirror surface portion provided on the back surface of the light guide plate and
With
The front side of the light guide plate has a front mirror surface portion.
The front mirror surface portion has an optical display unit that displays information by light when the mirror surface member is removed and formed of a rough surface or dots, and light from the light source member is emitted through the light guide plate. A light emitting device characterized by being provided . In addition to the prior SL rear mirror surface portion, the light emitting device according to claim 1, characterized in that it comprises a reflector. The light emitting device according to claim 1 or 2, wherein the light display unit is formed of a surface capable of diffusing light. The light emitting device according to claim 2, wherein a phosphorescent portion is provided on the back surface of the light guide plate or between the light guide plate and the reflector. The light emitting device according to any one of claims 1 to 4, wherein diffusion dots are formed on the back surface of the light guide plate. The light emitting device according to any one of claims 1 to 5, wherein the side surface of the light guide plate has a recess formed in a concave position corresponding to a portion where the light source member is arranged. The light emitting device according to any one of claims 1 to 6, wherein the front mirror surface portion is integrated with the light guide plate. The light emitting device according to any one of claims 1 to 7, wherein the front mirror surface portion has a bulging or concave center. The light emitting device according to any one of claims 1 to 8, wherein the half mirror has a bulging or dented center.

Images