CN103155020B - Planar light-emitting device - Google Patents

Abstract

A planar light-emitting device (1) for luminously displaying a design body (2) includes: a design body (2), the design body (2) having a design shape part (2c) representing a designed shape, and in the design shape A concave part (2a) with an opening on the lower surface is formed in the part (2c); a plate-shaped sheet (3), the sheet (3) is arranged below the design body (2), and has a (2) having substantially the same top view shape; and a flat light guide body (4), which guides the light from the light source (5), and the light guide body (4) It is arranged on the lower surface side of the sheet body (3), and has a light-emitting surface (4c) on the upper surface that is integrally in contact with the lower surface of the sheet body (3), and the light source (5) is in the concave part of the design body (2) (2a) is arranged so as to be close to the light emitting surface of the light guide (4).

Description

planar light emitting device

Associate application

This application claims the priority of Japanese Patent Application No. 2010-229353 for which it applied in Japan on October 12, 2010, The whole is taken in as a part of this application by reference.

technical field

The present invention relates to a planar light-emitting device that is thin and has high uniformity of light emission from a light-emitting surface.

Background technique

Conventionally, as a planar light-emitting device that utilizes light emission to obtain lighting effects, a planar light-emitting device that uses LEDs (Light Emitting Diodes) as a light source and is equipped with a transparent or translucent light guide body is known so as to detect light emitted from the light source. The light guides and diffuses it. In planar light-emitting devices, for example, there are methods such as the following methods: the side light method in which LEDs are arranged so that light is incident on the side surface of the light guide; The L-shaped method in which the light on one side of the light guide changes direction and diffuses in the light guide; and the light source method in the light guide that arranges LEDs in the light guide.

An example of such a planar light-emitting device is a light-emitting device that uses light to decorate signs or marks (design objects) such as logos of automobiles (for example, Patent Document 1 and Patent Document 2). The light-emitting device includes: a marking main body; a substrate disposed on the back side of the marking main body; an LED mounted on a surface of the substrate opposite to the marking main body; and a light guide accommodated in a concave portion on the upper surface side. In addition, the side surface of the LED is used as a light-emitting surface, and the back side is used as a reflection surface formed in the direction of the optical axis of the LED. Here, the top view shape of the light guide body is similar to the top view shape of the label main body, and the light-emitting surface on the side of the light guide body emits light to display the label main body. In addition, since a mortar-shaped concave portion is provided on the back side of the light guide, and its apex is positioned on the optical axis of the LED, the light from the LED is evenly reflected on the wall surface of the concave portion, and the light guide is facilitated. The uniform distribution of light in the body realizes uniform brightness of the light emitted from the light emitting surface.

Patent Document 3 discloses a side-light planar light source unit in which LEDs serving as light sources are arranged close to the side surfaces of a light guide. This side light method has high uniformity of light emission, but the degree of freedom in design is relatively low.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2006-44330

Patent Document 2: Japanese Unexamined Patent Publication No. 2006-44329

Patent Document 3: Japanese Patent Application Laid-Open No. 11-306831

Contents of the invention

The problem to be solved by the invention

The above-mentioned light-emitting devices of Patent Document 1 and Patent Document 2 are light-emitting devices based on a light-guiding light source system in which LEDs are arranged inside the light guide. The shape of the main body is similar, and in order to make the luminance of the entire light guide uniform, it is necessary to arrange a plurality of LEDs, and there is a problem of increased processing costs and manufacturing costs.

In addition, in the light-emitting devices of Patent Document 1 and Patent Document 2, there is a problem that, as shown in FIG. Shaped concave portion 57, the apex of the concave portion 57 is located on the optical axis of the LED55, but in the above-mentioned structure, since the light in the center of the light irradiated from the LED55 is mostly emitted near the LED55, it is shown in (C) of FIG. As shown, the brightness becomes particularly high near the LED 55. As shown in (D) of FIG. As shown in (B), the light-emitting device is a light-emitting device in which the central part of the light-emitting surface is particularly bright and dark parts are generated in the peripheral part, resulting in poor uniformity of light emission.

In view of such problems, an object of the present invention is to provide a planar light-emitting device that is thin and space-saving without being restricted by the position and number of light sources, and that has high uniformity of light emission from the light-emitting surface.

Technical solutions for solving problems

In order to achieve the above object, the planar light-emitting device according to the present invention is used for a light-emitting display design body, the planar light-emitting device includes: a design body, the design body has a design shape part indicating the shape of the design, and the design shape A concave portion with an opening on the lower surface is formed inside the portion; a flat plate-shaped thin body, which is arranged below the design body, and has approximately the same shape as that of the design body when viewed from above; and a flat plate-shaped light guide body, the light guide body guides the light from the light source, the light guide body is arranged on the lower surface side of the sheet, and the light guide body has an upper surface integral with the lower surface of the sheet body The light emitting surface in contact with the light source is disposed in the concave portion of the design body so as to be close to the light emitting surface of the light guide.

According to this configuration, since the light source is arranged in the concave portion of the design shape portion of the design body, there is no need to provide an extra space for installing the light source, and thinning of the planar light emitting device is achieved. Accordingly, it can also be applied to components with limited installation space, such as emblems mounted on the exterior of automobiles. In addition, the degree of freedom in the arrangement of the light sources is remarkably improved. Furthermore, compared with the case where it is installed in the light guide, it is unnecessary to form a recess for arranging the light source, etc. in the light guide, so that space can be saved without increasing manufacturing cost and manufacturing man-hours.

In this planar light-emitting device, it is preferable that a through-hole penetrating in an up-down direction is formed in the light guide at a position directly below the light source. In this case, since the through hole is formed directly below the light source, the light emitted from the light source is turned back on the side surface of the through hole and diffused into the light guide. Therefore, among the light emitted from the light source, the light near the center of the light source passes through the through hole and does not emit light from the light emitting surface of the light guide. This prevents the portion of the light source close to the light guide from emitting more light than the other portions, and uniformly emits light from the entire light emitting surface of the light guide.

In addition, it is also possible that the aperture of the through hole on the upper surface of the light guide is in the range of 0.4 to 1.0 mm, and the aperture on the lower surface of the light guide is in the range of 1.0 to 4.0 mm. The inner surface of the through hole has a substantially conical shape in which the diameter gradually increases toward the bottom of the light guide. In this case, since the through hole has a hole inner surface extending from the upper surface to the lower surface of the light guide body in a substantially conical shape, the light emitted from the light source can be used without waste, and the light can be made uniform in the light guide body. dispersed. Preferably, the inner surface of the through hole is a curved shape protruding downward. Therefore, the utilization efficiency of the light emitted from the light source can be further improved.

Any combination of at least two structures disclosed in the claims and/or the description and/or the drawings is included in the present invention. In particular, any combination of two or more claims described in the claims is also included in the present invention.

Invention effect

In the present invention, since the light source is arranged in the concave portion of the design shape portion of the design body, thinner and space-saving can be achieved, and since the through-hole of the light guide body is formed directly below the light source, it is possible to improve the light source from the light source. The uniformity of light emission on the light emitting surface.

Description of drawings

The present invention can be understood more clearly from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and drawings are only for illustration and description, and should not be used to limit the scope of the present invention. The scope of the invention is determined by the appended claims. In the drawings, the same reference numerals in a plurality of drawings represent the same part.

FIG. 1 is an exploded perspective view showing the structure of a planar light emitting device according to the present invention.

Fig. 2 is a longitudinal cross-sectional view of the logo-shaped portion of the planar light-emitting device in Fig. 1 taken along line II-II so as to be bilaterally symmetrical when viewed from above.

Fig. 3 is a plan view showing a sheet body applied to the planar light-emitting device of the present invention.

Fig. 4 is a partial sectional view showing a light guide applied to the planar light emitting device of the present invention.

Fig. 5 is a side view showing a light source and a light guide applied to the planar light emitting device of the present invention.

(A) of FIG. 6 is a partial side view of the planar light-emitting device in the present invention, and (B) to (D) of FIG. 6 show the simulation results.

(A) of FIG. 7 is a partial side view of a conventional planar light-emitting device, and (B) to (D) of FIG. 7 show the simulation results thereof.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a planar light-emitting device 1 according to the present invention applied to a design body 2 such as a logo mark arranged on the outer surface of a motor vehicle for decoration of the vehicle. Furthermore, names such as vehicle types and license plates, or logo marks of motor vehicles may be applied to the design body 2 .

The planar light-emitting device 1 of FIG. 1 is formed by laminating a design body 2 , a light source 5 , a sheet body 3 , and a light guide body 4 in this order. The sheet body 3 and the light guide body 4 are in the shape of a flat disc. The design body 2 has, as an example of a design shape body 2c that expresses a design shape when viewed from above, a logo-shaped part of a ring A formed by enclosing the letter A with a circle, and the part other than the logo-shaped part 2c is hollowed out and shaped as through shape. The design body 2 is obtained by injection molding thermoplastic resin such as ABS resin, and a metallic texture is plated on the surface of the molded body of ABS resin by coating, printing, vapor deposition, or electroplating.

When the planar light-emitting device 1 is viewed from the design body 2 side (upper side), since a part of the sheet 3 is exposed in a portion of the design body 2 other than the logo-shaped portion 2c, the sheet 3 can be visually recognized. Here, substantially the entire upper surface of the light guide body 4 is covered with the design body 3 and the sheet body 3 .

FIG. 2 is a longitudinal cross-sectional view of the logo-shaped portion 2c of the design body 2 of the planar light-emitting device 1 cut along the line II-II of FIG. 1 so that it is bilaterally symmetrical in plan view. The logo-shaped part 2c of the design body 2 is formed with a recessed part (space storage part) 2a whose lower surface is opened inside, thereby reducing the weight by an amount corresponding to the recessed part 2a. The designed body 2 is formed to have a thickness of approximately 1.5 mm in order to achieve necessary strength and durability while achieving weight reduction. As the material used as the material of the design body 2, other thermoplastic resins such as polypropylene and polyethylene may be used, or thermosetting resins, metals, and the like may be used.

The light source 5 is disposed in the concave portion 2 a of the logo-shaped portion (design-shaped portion) 2 c of the designed body 2 at a position above the sheet body 3 . This eliminates the need for a new space for arranging the light source 5, so that the planar light-emitting device 1 can be employed even when the installation space is limited. In addition, compared with the conventional light emitting device in which the light source is arranged on the side surface of the light guide, there are fewer restrictions on the position of the light source 5, and the degree of freedom in design is improved. As the light source 5 , a surface mount type LED (Light Emitting Diode) mounted on a glass epoxy substrate is suitably used.

In this example, only one light source 5 is arranged in the approximate center of the planar light-emitting device 1, but it is not limited to this, and a plurality of light sources 5 may also be provided. any position.

FIG. 3 shows a plan view of the laminar body 3 seen from above. The sheet body 3 is a molded body obtained by injection molding a thermoplastic resin such as polycarbonate resin, and is formed in a thin plate disc shape so that the outer shape of the design body 2 is substantially the same as a circle, and is arranged to shield the design body 2 The opening of the concave portion 2a and the hollowed-out through portion 2b other than the logo. A through hole (light passing hole) 3 a is formed in the sheet body 3 at a position directly below the light source 5 . The light irradiated from the light source 5 is irradiated to the light guide 4 through the light passage hole 3 a without being reflected by the sheet 3 . It is preferable that the light passage hole 3 a is formed to be equal to or larger than the effective light emitting area of the light source 5 ( FIG. 5 ) to increase the utilization efficiency of light emitted from the light source. In addition, an insertion hole 3 b through which wiring extending from the light source 5 passes is formed in the sheet body 3 .

The back surface of the sheet 3 is colored by printing or coating in the order of black, cyan, and white from the inside. In the part of the sheet body 3 corresponding to the through-hole 2b of the design body 2, that is, the part other than the light-emitting part 3c that can be visually recognized from the outside of the planar light-emitting device 1, the part is partially painted black to hide The light guided by the light guide 4 forms a light shielding portion 3 d on the sheet 3 that does not emit light to the outside of the planar light emitting device 1 . The entire back surface of the sheet 3 is painted in cyan to transmit the light guided by the light guide 4 , thereby forming a light emitting portion 3 c that emits cyan light around the logo-shaped portion 2 c on the sheet 3 . The entire back surface of the sheet body 3 is painted white to reflect the light guided by the light guide 4, suppress light attenuation in the light shielding portion 3d, and improve light utilization efficiency. In addition, there is an effect of improving the visibility of the portion of the light emitting unit 3 c during non-lighting such as daytime.

The light guide 4 in FIG. 1 is a molded body obtained by injection molding a thermoplastic resin such as acrylic (PMMA) resin, etc., and is formed so that the surface thereof has approximately the same size as the sheet body 3 , and is disposed on the side of the sheet body 3 . The side opposite to the side facing the design body 2 is in contact with the sheet body 3 . The upper surface of the light guide 4 is a light emitting surface 4c. A through hole 4 a penetrating in the vertical direction is formed in the light guide 4 . As shown in FIG. That is, the light source 5 is arranged so as to be close to the light emitting surface 4 c of the light guide 4 . The distance between the light source 5 and the light emitting surface 4c of the light guide 4 is preferably 1.0 mm or less, more preferably 0.5 mm or less. In addition, an insertion hole 4 b through which wiring extending from the light source 5 passes is formed in the light guide 4 ( FIG. 1 ).

As the light guide 4, polycarbonate resin, polypropylene resin, polyethylene resin, silicone resin, etc. may be used instead of the above-mentioned acrylic resin. In addition, instead of using a transparent resin, a translucent material may be used.

As shown in Figure 4, for the through-hole 4a of light guide 4, the opening diameter of the lower surface on the side opposite to the light source 5 is larger than the opening diameter of the upper surface on the light source 5 side, and the hole inner surface of the through-hole 4a has The aperture has a substantially conical shape in which the diameter gradually increases toward the bottom of the light guide body 4 . The aperture D1 of the opening 4aa of the through hole 4a on the upper surface of the light guide 4 (the surface on the light source 5 side) is in the range of 0.4 to 1.0 mm, more preferably in the range of 0.6 to 0.8 mm. The aperture D2 of the opening 4bb on the lower surface (the surface opposite to the light source 5) is 1.0 to 4.0mm, more preferably in the range of 2.0 to 3.0mm, so that the through hole 4a is suitable for improving the light emitted from the light source 5. usage efficiency.

By providing the through hole 4 a, the central part of the light emitted from the light source 5 passes through the through hole 4 a and is discarded, and the peripheral part is turned back on the inner surface of the through hole 4 a to be guided into the light guide 4 . Thereby, it is possible to realize the planar light-emitting device 1 that suppresses the light emission from the vicinity of the light source 5 and disperses the light throughout the light guide 4 to improve the uniformity of light emission on the entire light-emitting surface 4c of the light guide 4. sex.

In addition, the inner surface of the through hole 4 a is preferably in a shape (curved shape) swollen so as to protrude inward, and by forming such a shape, the utilization efficiency of light irradiated from the light source 5 can be further improved. In this case, the light incident on the light guide body 4 enters the opening 4aa on the light source 5 side of the through hole 4a in the central portion of the light guide body 4, and the light that escapes from the opening 4ab on the opposite side of the light source 5 passes directly and is received. Otherwise, the light incident on the inner surface of the light guide 4 is folded back, and the direction of the light is changed relative to the direction of light emitted from the light source 5 , so that the light can be introduced into the light guide 4 .

The back surface of the light guide 4 is processed with a dot pattern or stripes, or printed or coated with white. With such a configuration, since light is reflected on the back surface of the light guide 4 , the utilization efficiency of light can be improved.

As shown in FIG. 5 , the through hole 4 a is preferably provided in the same area as or within the effective light emitting area of the light source 5 (light emitting portion of the LED). Specifically, it is preferable that the opening 4aa on the side of the light source 5 is a shape that does not exceed the size of the effective light emitting area of the light source 5, and that the opening 4ab on the opposite side of the light source 5 does not exceed a size defined by the half-value angle. The size of the surface projected on the side of the light source 5 by the axis of , the half-value angle is determined by the pointing characteristics of the light source 5 . Thereby, the light emitted from the light source 5 can be efficiently introduced into the light guide 4 .

Example

Hereinafter, examples of the planar light-emitting device of the present invention will be described.

(Example 1)

As a light source, only one LED NSSW64 (3.2×2.8mm, half-value angle 120°) made by Nichia was used. A transparent acrylic (PMMA) resin with a thickness of 0.8 mm was used as the light guide, and a dot pattern for uniformly emitting light in the plane was formed on the back surface of the light guide by laser. In addition, openings are formed as follows: on the surface of the light guide, that is, on the LED side, the aperture D1 = 0.6 mm, and on the back of the light guide, the aperture D2 = 1.2 mm, and the inner side of the opening faces The bottom is convex and has a slope of R1.2 (mm). In addition, a gap of 0.5 mm is provided between the light emitting surface of the LED and the light guide in consideration of shrinkage and expansion due to temperature changes.

On the surface of the light guide, that is, on the side where the LED is arranged, a sheet with a thickness of 0.5 mm coated or printed in a manner corresponding to the logo design is arranged, and further, the design is arranged on the upper surface side of the sheet. body, the logo-shaped part of the design body is formed in a convex shape. The designed body is formed by injection molding ABS resin, and has a concave portion formed so as to have a space with a width of approximately 5 mm inside the convex logo-shaped portion. The LED is a surface-mount type mounted on a glass-epoxy resin substrate with a thickness of 1.0 mm, and the LED is arranged in the concave portion of the logo-shaped portion of the design body.

(Example 2)

As a light source, only one LED NSSW64 (3.2×2.8mm, half-value angle 120°) made by Nichia was used. As the light guide, transparent acrylic (PMMA) resin with a thickness of 0.8 mm was used, and a diffuser was arranged on the back of the light guide to uniformly emit light in the plane. In addition, openings are formed as follows: on the surface of the light guide, that is, on the LED side surface, the aperture D1 = 0.6mm, and on the back of the light guide, the aperture D2 = 1.2mm, and the inside of the hole faces downward. Convex and have a slope of R1.2 (mm). In addition, a gap of 0.5 mm is provided between the light emitting surface of the LED and the light guide in consideration of shrinkage and expansion due to temperature changes.

On the surface of the light guide, that is, a thin sheet with a thickness of 0.5mm that is designed with a sign or the like is arranged on the side where the LED is arranged, and then a design body is arranged on the upper surface side of the thin sheet, and the design body is formed. There is a convex mark that is the same as the mark of the sheet body. The designed body is formed by injection molding ABS resin, and has a concave portion formed so as to have a space with a width of about 5 mm inside the convex logo-shaped portion. The LED is a surface-mount type mounted on a glass-epoxy resin substrate with a thickness of 1.0 mm, and the LED is arranged in the concave portion of the logo-shaped portion of the design body.

(Example 3)

As a light source, only one LED NSSW64 (3.2×2.8mm, half-value angle 120°) made by Nichia was used. A polycarbonate (PC) resin with a thickness of 0.8 mm was used as the light guide, and a dot pattern for uniformly emitting light in the plane was formed on the back surface of the light guide by laser. In addition, openings are formed as follows: on the surface of the light guide, that is, on the LED side surface, the aperture D1 = 0.6mm, and on the back of the light guide, the aperture D2 = 1.2mm, and the inside of the hole faces downward. Convex and have a slope of R1.2 (mm). In addition, a gap of 0.5 mm is provided between the light emitting surface of the LED and the light guide in consideration of shrinkage and expansion due to temperature changes.

On the surface of the light guide, that is, a thin sheet with a thickness of 0.5 mm that is designed with a sign or the like is arranged on the side where the LED is arranged, and then a design body is arranged on the upper surface side of the thin sheet, and the design body The same mark as the mark of the sheet body is formed with a convex shape. The designed body is formed by injection molding ABS resin, and has a concave portion formed so as to have a space with a width of approximately 5 mm inside the convex logo-shaped portion. The LED is a surface-mount type mounted on a glass-epoxy resin substrate with a thickness of 1.0 mm, and the LED is arranged in the concave portion of the logo-shaped portion of the design body.

(Example 4)

As a light source, only one LED NSSW64 (3.2×2.8mm, half-value angle 120°) made by Nichia was used. A transparent acrylic (PMMA) resin with a thickness of 0.8 mm was used as the light guide, and a dot pattern for uniformly emitting light in the plane was formed on the back surface of the light guide by laser. In addition, openings are formed as follows: on the surface of the light guide, that is, on the LED side surface, the aperture D1 = 0.6mm, and on the back of the light guide, the aperture D2 = 4.1mm, and the inside of the hole faces downward. Convex and have a slope of R1.2 (mm). In addition, a gap of 0.5 mm is provided between the light emitting surface of the LED and the light guide in consideration of shrinkage and expansion due to temperature changes.

On the surface of the light guide, that is, a thin sheet with a thickness of 0.5 mm that is designed with a sign or the like is arranged on the side where the LED is arranged, and then a design body is arranged on the upper surface side of the thin sheet, and the design body The same mark as the mark of the sheet body is formed with a convex shape. The designed body is formed by injection molding ABS resin, and has a concave portion formed so as to have a space with a width of approximately 5 mm inside the convex logo-shaped portion. The LED is a surface-mount type mounted on a glass-epoxy resin substrate with a thickness of 1.0 mm, and the LED is arranged in the concave portion of the logo-shaped portion of the design body.

(Example 5)

As a light source, only one LED NSSW64 (3.2×2.8mm, half-value angle 120°) made by Nichia was used. A transparent acrylic (PMMA) resin with a thickness of 0.8 mm was used as the light guide, and a dot pattern for uniformly emitting light in the plane was formed on the back surface of the light guide by laser. In addition, the following openings are formed: on the surface of the light guide, that is, on the LED side surface, the aperture D1 = 3.2mm, and on the back of the light guide, the aperture D2 = 4.1mm, and the inner surface of the opening is Straight. In addition, a gap of 0.5 mm is provided between the light emitting surface of the LED and the light guide in consideration of shrinkage and expansion due to temperature changes.

On the surface of the light guide 4, that is, a thin sheet with a thickness of 0.5 mm that is designed with a sign or the like is arranged on the side where the LED is arranged, and then a design body is arranged on the upper surface side of the thin sheet, and the design body The same mark as the mark of the sheet body is formed with a convex shape. The designed body is formed by injection molding ABS resin, and has a concave portion formed so as to have a space with a width of approximately 5 mm inside the convex logo-shaped portion. The LED is a surface-mount type mounted on a glass-epoxy resin substrate with a thickness of 1.0 mm, and the LED is arranged in the concave portion of the logo-shaped portion of the design body.

(comparative example 1)

As a light source, only one LED NSSW64 (3.2×2.8mm, half-value angle 120°) made by Nichia was used. A transparent acrylic (PMMA) resin with a thickness of 0.8 mm was used as the light guide, and a dot pattern for uniformly emitting light in the plane was formed on the back surface of the light guide by laser. On the surface of the light guide, that is, a thin sheet with a thickness of 0.5mm that is designed with a sign or the like is arranged on the side where the LED is arranged, and then a design body is arranged on the upper surface side of the thin sheet, and the design body is formed. There is a convex mark that is the same as the mark of the sheet body. The designed body is formed by injection molding ABS resin, and has a concave portion formed so as to have a space with a width of approximately 5 mm inside the convex logo-shaped portion. The LED is a surface-mount type mounted on a glass epoxy resin substrate with a thickness of 1.0 mm, and the LED is arranged facing the side of the light guide body, and arranged so as to irradiate the side surface of the light guide body with light.

Table 1 shows the results of observing the aesthetics of lighting by the planar light-emitting devices of Examples 1 to 5 and Comparative Example 1 described above. As a result, in Examples 1 to 4, it was confirmed that the shape of the sign was uniformly lighted, and it was confirmed that performance substantially the same as that of Comparative Example 1, which is a conventional side-light type planar light-emitting device, was obtained. For Example 5, the aesthetics were slightly inferior.

(A) of FIG. 6 shows a partial side view of the planar light emitting device 1 , and the simulation results thereof are shown in (B) to (D) of FIG. 6 . The purpose of the through hole 4a in the light guide 4 in FIG. 6(A) and the recess 57 in the light guide 54 in FIG. Leading light into the light guide body is the same in this point, but the through hole 4a formed in the light guide body 4 of the present invention is a through hole that is open on the light source 5 side and the opposite side of the light source 5. In contrast, The recess 57 of the conventional light guide 54 is a recess that forms a space partway in the thickness direction of the light guide 54 and opens toward the side opposite to the light source 5 .

As shown in (D) of FIG. 6 , the light guide body 4 of the present invention has a relatively uniform light beam compared with the conventional light guide body 54 having the concentrated portion S of the light beam shown in (D) of FIG. 7 , and, As shown in (C) of FIG. 6 , the light guide 4 of the present invention is different from the prior art in which the light rays are concentrated around the concave portion 57 and the brightness near the light source 54 is significantly higher than other parts and has poor uniformity as shown in (C) of FIG. 7 . Compared with the light guide body 54 of the light source 5, since the central part of the light irradiated from the light source 4 is discarded through the through hole 4a at the position directly below the light source 5, and the light around it is guided into the entire light guide body 4, the average brightness is high. As shown in FIG. 6(B) , more uniform light can be emitted from the light emitting surface 4 c of the light guide 4 .

Industrial availability.

The planar light-emitting device of the present invention is not restricted by the position and number of light sources, can realize thinness and space saving, and has high uniformity of light emission from the light-emitting surface, and can emit light to display a design body, so it is not only suitable for decorating vehicles, but also can Suitable for use in decoration of various installations.

As described above, preferred embodiments of the present invention have been described with reference to the drawings, but various additions, changes, or deletions can be made without departing from the gist of the present invention, and such configurations are also included in the scope of the present invention. Inside.

Label description

1: planar light emitting device;

2: design body;

2a: concave part;

2b: through part;

2c: Design Shape Department (Logo Shape Department);

3: flake body;

3a: Through hole (light passing hole);

3b: through the insertion hole;

3c: light emitting part;

3d: shading part;

4: Light guide;

4a: through hole;

4c: light-emitting surface;

5: Light source (LED).

Claims (4)

1. a sheet light emitting apparatus, it designs body for luminescence display, and described sheet light emitting apparatus possesses: design body, and described design body has the design shape portion of the shape representing design, and in this design shape portion, be formed with the recess of lower surface opening; Flat sheet, described sheet is disposed in the below of this design body, and has the profile roughly the same with the profile of this design body when overlooking; And flat light conductor, described light conductor guides the light from light source, and described light conductor is disposed in the lower face side of described sheet, and described light conductor has the light-emitting area contacted with the lower surface entirety of this sheet at upper surface,

Described light source arranges in the mode of the light-emitting area close to described light conductor in the recess of described design body,

Position immediately below described light source, be formed along the through through hole of its above-below direction at described light conductor, the hole medial surface of described through hole has aperture and becomes large roughly cone shape gradually along with the below towards described light conductor, and the hole medial surface of described through hole is the curved shape protruded downwards.

2. sheet light emitting apparatus according to claim 1,

Described through hole is the scope of 0.4 ~ 1.0mm in the aperture of the upper surface of described light conductor, is the scope of 1.0 ~ 4.0mm in the aperture of the lower surface of described light conductor.

3. sheet light emitting apparatus according to claim 1,

Described design body is disposed in the outside surface of vehicle.

4. sheet light emitting apparatus according to claim 1,

Described light source is light emitting diode (LED), and described through hole is set in identical with effective light-emitting zone of this light source or within it region.