JP5826522B2 - Light emitting device - Google Patents

Description

  The present invention relates to a light emitting device.

In recent years, light-emitting devices using white light-emitting diodes (LEDs) as light sources have been widely used for backlights of electronic devices. Moreover, in order to display predetermined information in an instrument panel of an automobile, a light-emitting device housed in a compact manner is often used (see Patent Documents 1 and 2). A light emitting device used as a light source is used.
By the way, since the point light emission of LED generally has a wide angular distribution, a rod integrator may be used to configure this as a light-emitting device having a uniform illuminance distribution.

The rod integrator is made of glass or transparent resin, and includes, for example, a solid rod integrator 100 shown in FIG. 5A and a hollow rod integrator 102 shown in FIG. 5B. The former has a light incident surface 100a on which the LEDs are arranged to face each other and a light emitting surface 100b opposite to the light incident surface 100a, and light emitted from the LEDs enters the solid interior from the light incident surface 100a. By proceeding to the light emitting surface 100b while repeating the reflection, the luminance of the light emitting surface 100b is made uniform (see Patent Document 3).
Further, the latter also has a light incident end portion 102a where the LED 104 is disposed to face and a light emitting end portion 102b opposed to the light incident end portion 102a, and light emitted from the LED 104 is hollow from the light incident end portion 102a. Luminance of an irradiation object (not shown) such as a spatial light modulator disposed on the light emitting end 102b by entering the inside and proceeding to the light emitting end 102b while repeating total reflection at the inner side surface 102c. (See Patent Document 4).

JP 2010-149768 A JP 2009-089437 A JP 2004-184612 A JP 2006-349987 A

By the way, the above-mentioned rod integrators 100 and 102 make the luminance uniform by sending light incident on the light incident surface 100a and the light incident end 102a to the light emitting surface 100b and the light emitting end 102b while totally reflecting the light. Therefore, in order to obtain light emission with excellent luminance uniformity, it is desirable that the element length (length in the optical axis direction) is longer. Therefore, unlike the light guide plate 106 shown in FIG. 6B, the element length is short, and a sufficient distance between the light incident surface 106a facing the LED 104 and the light emitting surface 106b facing the LED 104 cannot be secured. In such a case, as shown by a curve L in FIG. 6 (a), the luminance of the light emitting surface 106b varies across the entire light emitting surface 106b depending on the height distribution of the luminance distribution according to the number and arrangement of the LEDs 104. Will occur.
Further, since the rod integrators 100 and 102 are mainly intended to make the luminance uniform, other uses, for example, if necessary, the entire area of the light emitting surface or the light emitting end, It is not suitable for a light-emitting device that selectively emits light from different light-emitting areas such as a relatively wide area or a part of a relatively narrow area. In the light emitting device using the conventional light guide plate 106 having a short element length shown in FIG. 6B, even though it is possible to selectively emit a part of the region (as a result), It is not possible to realize uniform light emission from a relatively wide area up to the entire area.

  The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to change the light emitting area of the light emitting surface as necessary. In addition, these effects can be obtained regardless of the element length of the light guide (light guide plate) of the light emitting device using the point light source.

(Aspect of the Invention)
The following aspects of the present invention exemplify the configuration of the present invention, and will be described separately for easy understanding of various configurations of the present invention. Each section does not limit the technical scope of the present invention, and some of the components of each section are replaced, deleted, or further while referring to the best mode for carrying out the invention. Those to which the above components are added can also be included in the technical scope of the present invention.

(1) an opposing two main surfaces and the main surfaces connecting the peripheral end face, a light guide plate having a rectangular flat plate shape in plan view and have a constant thickness,
A point light source disposed to face at least one of the peripheral end faces of the light guide plate,
One surface of the peripheral end surface excluding the surface where the point light source of the light guide plate is disposed is a light emitting device that constitutes a light emitting surface,
A first point light source disposed on a first light incident surface of the light guide plate facing the light emitting surface;
A second point light source disposed on a second light incident surface intersecting the light emitting surface;
Light emitted from the second point light source enters the light guide plate from the second light incident surface, reaches the opposing peripheral end surfaces while totally reflecting the two main surfaces, and is reflected. In addition, the light reaching the first light incident surface is repeatedly reflected and the reflected light reaches the light emitting surface and is emitted from the entire light emitting surface. The second point light source is located in the vicinity of the first light incident surface on which the first point light source is disposed, and
A plurality of the first point light sources are arranged so as to have different distances from the first light incident surface (Claim 1).

In the light emitting device described in this section, light emitted from the first point light source disposed on the light incident surface facing the peripheral end surface constituting the light emitting surface of the light guide plate is transmitted from the first light incident surface to the light guide plate. And enters the light emitting surface while being totally reflected between the two main surfaces. Here, light emitted from the first point light source closer to the first light incident surface after emitted from the light emitting surface of the first point light source, since the distance propagated in the air is short, due to the air layer without much subjected to diffusion action to the first light incident surface in the longitudinal direction (circumferential direction of the peripheral end face), reaching the first light incident surface. Therefore, the light emitting surface of the light guide plate is dotted, or a part of the entire light emitting surface emits light. On the other hand, the light emitted from the first point light source far from the first light incident surface has a long propagation distance in the air after being emitted from the light emitting surface of the first point light source, A large diffusion effect in the longitudinal direction of the light incident surface is received to reach the light incident surface. Therefore, a wider area of the light emitting surface emits light.

Further, the light guide plate because it is a rectangular flat plate, the light guide plate on a rectangular flat plate, the peripheral edge surface connecting between two opposed main surfaces, are disposed to face the first light incident surface The light emitted from the first point light source emits light from the light emitting surface facing the light incident surface in the form of dots, or a part of the entire light emitting surface emits light.

Moreover, crossing from to include the circumferential edge surface of the light guide plate, it is arranged in a plane intersecting the plane constituting the light-emitting surface, the second point light sources, the peripheral end face of the light guide plate, a light emitting surface face The light emitted from the second point light source disposed on the second light incident surface is incident on the light guide plate from this surface and is reflected to the opposite peripheral end surfaces while totally reflecting the two main surfaces. It reaches and is reflected. Moreover, it repeats reaching | attaining the 1st light-incidence surface in which the above-mentioned 1st point light source is arrange | positioned, and reflecting. And the light which repeated reflection reaches | attains the light emission surface, and is radiate | emitted from the whole light emission surface. That is, the light emitting surface emits light uniformly by the light emitted from the second point light source arranged on the second light incident surface.

Moreover, the second point light source, since the position in the vicinity of the first light incident surface on which the first point light source is disposed, light emitted from the second point light sources are two A peripheral end surface (first light incident surface) on which the first point light source is located in the vicinity of the second point light source while reaching the opposing peripheral end surface while totally reflecting the main surface. The chance of being reflected by the light increases, and the light traveling toward the peripheral end surface constituting the light emitting surface increases. Further, even after the outgoing light from the second point light source reaches the opposing peripheral end face and is reflected, the same effect is obtained. Therefore, the brightness of uniform light emission on the light emitting surface by the second point light source is improved.

( 2 ) In the above item (1) , the first point light sources are arranged in two or more rows so that the distance from the first light incident surface is different (invention) Item 2).
The light emitting device according to this aspect, light emitted from the first point light source for each column where the distance between the first light incident surface is different, depending on the distance, is intended to achieve the above-described action.

( 3 ) In the above item (1) , the first point light sources are arranged in a line, and the first light incident surface has a concavo-convex shape so that the distance from the line of the first point light sources is different. A light emitting device formed in the above (claim 3).
In the light-emitting device described in this section, the light emitted from the first point light source having a different distance from the concave-convex first light incident surface exhibits the above-described action according to the distance.

(4) above (1) In the item (3), the emission color of the first point light source is, the first light emitting device which is different according to the distance between the light incident surface (claim 4).
The light emitting device according to the above, the emission color of the first point light source is different from that according to the distance between the first light incident surface, the light emitting surface of the light guide plate in a point-like, or the light guide plate The light emission color when a part of the entire light emitting surface emits light is different from the light emission color when a wider area emits light.

(5) In the above (1) (4) of this section, wherein the first point light source, the light emitting surface thereof, and those arranged in parallel to said first light entrance face, said first A light emitting device including a non-parallel arrangement with respect to the light incident surface.
In the light emitting device described in this section, a part of the plurality of first point light sources is arranged such that the light emitting surface thereof is not parallel to the first light incident surface, whereby the first point The position or angle at which the light emitted from the light source is incident on the first light incident surface is adjusted, and the light emitting surface of the light guide plate emits light in a point-like manner or the entire light emitting surface of the light guide plate . The light emission position of a part of the area is adjusted.

(6) above in (1) (5) section, wherein the first point light sources driver is for lighting control independently the first point light source emitting device (claim 6).
In the light-emitting device described in this section, the plurality of first point light sources are controlled to be turned on independently by the driver, so that the light- emitting surface of the light guide plate is dotted or the light- emitting surface of the light guide plate When light is emitted from a part of the entire region, various light emission patterns are realized by light emission for each light emitting element.

( 7 ) In the above items (1) to ( 6 ), the driver of the first point light source includes the plurality of first light sources from one end to the other end in the longitudinal direction of the first light incident surface . A light-emitting device that sequentially controls lighting of point light sources (Claim 7).
The light emitting device according to the above, the first point light source drivers, toward the other end from one end in the longitudinal direction of the first light incident surface, so that the plurality of first point light source is sequentially turned by being controlled, the light emitting surface point-like to the light-emitting position of the light guide plate, or one side of the peripheral edge surface constituting the light emitting surface of the light guide plate, the position of the partial region of the entire, from one end It moves sequentially toward the other end.

( 8 ) In the above items (1) to ( 7 ), the second point light source is a light emitting element disposed on at least one of two surfaces intersecting the light emitting surface of the peripheral end surface of the light guide plate. apparatus.
The light-emitting device described in this section exhibits the above-described effect by light emitted from the second point light source disposed on at least one of the two surfaces intersecting the light-emitting surface of the peripheral end surface of the light guide plate. It is. Further, since the second point light sources are arranged on the two surfaces intersecting the light emitting surface, the above-described action is doubled by the light emitted from both of the second point light sources.

( 9 ) The light emitting device according to ( 1 ) to ( 8 ), wherein the first point light source and the second point light source have different emission colors.
In the light emitting device described in this section, the light emitted from the first point light source emits light from the light emitting surface in a dot shape or a part of the entire light emitting surface. The light emission color differs depending on the uniform light emission of the light emitting surface by the light emitted from the point light source.

( 10 ) In the above items (1) to ( 9 ), a light emitting device comprising a reflective member that covers the periphery excluding the first and second point light sources and a portion constituting the light emitting surface of the light guide plate (claim 8 ). ).
The light-emitting device described in this section is configured by the reflecting member that covers the first and second point light sources and the portion other than the light-emitting surface of the light-guide plate from the main surface of the light-guide plate and the peripheral end surface other than the light-emitting surface Light leaking outside is also reflected and re-entered into the light guide plate. And the light which reentered in the light-guide plate will contribute to light emission of the above-mentioned light emission surface.

  Since this invention was comprised in this way, it becomes possible to change the light emission area | region of a light emission surface as needed. In addition, these effects can be obtained regardless of the element length of the light guide (light guide plate) of the light emitting device using the point light source.

BRIEF DESCRIPTION OF THE DRAWINGS The light-emitting device which concerns on this invention is shown typically, (a) is a perspective view which shows a decomposition | disassembly state, (b) is a perspective view which shows the assembled state. It is a top view which shows the light-guide plate and a point light source of the light-emitting device which concerns on embodiment of this invention, (a) is a top view, (b) (c) is the light guide | induction which showed the aspect of light emission of a light emission surface. It is a front view of a light board. (A) (b) is both a top view which shows the light-guide plate and point light source which concern on the light-emitting device which concerns on embodiment of this invention which concerns on another example. Both (a) and (b) are a plan view showing a light guide plate and a point light source according to still another example of the light emitting device according to the embodiment of the present invention, and a light guide showing the light emission mode of the light emitting surface. It is a front view of a light board. BRIEF DESCRIPTION OF THE DRAWINGS The light guide of the conventional light-emitting device is shown typically, (a) is a perspective view which shows a solid-type rod integrator, (b) is sectional drawing which shows a hollow-type rod integrator. It explains the problem when the element length of the light guide is shortened, (a) is a graph showing the luminance distribution of the light guide plate according to (b), (b) is a light guide plate and LED with a short element length FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the light emitting device 10 according to the embodiment of the present invention includes a light guide plate 12, LEDs 14 as a plurality of point light sources, a circuit board 16B on which the LEDs 14 are mounted, and a light emitting surface 14a of the LEDs 14. And a housing 16A that covers a specific portion of the light guide plate 12 except for the above, and these are configured as an integral unit. Among these, the housing 16A and the circuit board 16B constitute a reflection member 16 described later. Reference numeral 13 in FIG. 1A denotes a connector mounted on the circuit board 16B and connected to an external circuit.

  As shown in FIGS. 1A and 2, the light guide plate 12 includes two opposing main surfaces 12c and 12d and peripheral end surfaces 12a, 12b, and 12f that connect the main surfaces 12c and 12d. The thickness of the light guide plate 12 (the distance between the main surfaces 12c and 12d) is constant, and in the example of FIG. Here, the light guide plate 12 is a plate-like light guide formed by molding a transparent resin material. Suitable transparent resin materials for the light guide plate 12 include methacrylic resin, polycarbonate resin, polystyrene resin, polyolefin resin, amorphous polyolefin resin, polyester resin, polystyrene resin, transparent fluororesin, epoxy resin, and the like.

Further, a plurality of LEDs 14 (14A, 14B) as first light sources facing the one surface 12a of the peripheral end surface of the light guide plate 12 are arranged along the one surface 12a of the peripheral end surface. It has become. And one surface 12b facing one surface (hereinafter also referred to as “first light incident surface”) 12a on which the LED 14 is disposed is a light emitting surface (hereinafter 12b is also referred to as “light emitting surface”). It is used.
In the example of FIGS. 1A and 2, the plurality of LEDs 14 </ b> A and 14 </ b> B are arranged in two rows so that the distance from the first light incident surface 12 a is different. In the row of LEDs 14, each light emitting surface is in close contact with the first light incident surface 12a of the light guide plate 12, and the row of LEDs 14B is located farther from the first light incident surface 12a than the row of LEDs 14A. doing.
The drivers of the LEDs 14A and 14B are configured to be capable of sequentially controlling the lighting of the LEDs 14A and 14B from one end to the other end in the longitudinal direction of the light incident surface 12a. The driver may be mounted on the circuit board 16B or may be installed outside the circuit board 16B.

  Further, in the example of FIGS. 1A and 4A, the LED 14 as the second point light source is also provided on the peripheral end surface 12f of the peripheral end surface of the light guide plate 12 orthogonal to the surface 12b constituting the light emitting surface. (14C) is arranged, and the peripheral end surface 12f is a second light incident surface. The LED 14 (14C) is positioned in the vicinity of the first light incident surface 12a of one surface 12f (two surfaces facing each other in the illustrated example). Has been placed. In the illustrated example, the emission color of the LED 14A is red, the emission color of the LED 14B is orange, and the emission color of the LED 14C is green.

Further, the housing 16A is made of white resin (white polycarbonate), and the circuit board 16B is coated with white on the surface facing the light guide plate 12, thereby improving the light reflection efficiency. Further, although not shown, a light incident prism that extends in the thickness direction of the light guide plate 12 is appropriately formed on the first light incident surface 12 a of the light guide plate 12. Similarly, a prism shape extending in the thickness direction of the light guide plate 12 is formed on the light emitting surface 12b of the light guide plate 12, or a prism sheet is disposed. It should be noted that the specific prism shapes used individually may be any as long as an appropriate light diffusion effect can be obtained.
The illustrated light guide plate 12 has a second light incident surface 12f (refer to FIG. 1B) orthogonal to the light emitting surface 12b rather than the side length of the peripheral end surface 12b constituting the light emitting surface in plan view. The side length is short. In the embodiment of the present invention, the side length of the peripheral end surface 12b constituting the light emitting surface is 50 mm, whereas the side length of the peripheral end surface 12f orthogonal to the light emitting surface 12b is 20 mm.

FIG. 3 shows another example of the light guide plate 12 and the LEDs 14A and 14B of the planar illumination device 10 according to the embodiment of the present invention. In the example of FIG. 3A, a plurality of LEDs 14A and 14B are arranged in a row, and the light incident surface 12a of the light guide plate 12 has a convex portion 12aA and a concave portion 12aB so that the distance to the row of point light sources is different. It is formed in the uneven | corrugated shape which consists of.
In the illustrated example, the convex portion 12aA is in close contact with the light emitting surface of the LED 14A. Further, as will be described later, the concave portion 12aB that is separated from the light emitting surface of the LED 14B is more than the convex portion 12aA in consideration of the diffusion effect of the light emitted from the LED 14B in the longitudinal direction of the light incident surface 12a by the air layer. The length of the light incident surface 12a in the longitudinal direction is increased. Note that the characteristic portion of FIG. 3A can be used in combination with the example of FIG.

In the example of FIG. 3B, a plurality of LEDs 14A, 14B, and 14C are arranged in three rows so that the distance from the first light incident surface 12a is different. The row of LEDs 14C is located farther from the first light incident surface 12a than the row.
In FIG. 4B, as another application example, an angle is given so that the angle formed by the light emitting surface of the LED 14B that emits orange light and the light incident surface 12a of the light guide plate 12 is non-parallel. Is shown.

Now, according to the embodiment of the present invention configured as described above, the following operational effects can be obtained. First, the light emitting device 10 according to the embodiment of the present invention includes LEDs 14A and 14B as first point light sources arranged on the first light incident surface 12a facing the light emitting surface 12b of the light guide plate 12. The emitted light enters the light guide plate 12 from the light incident surface 12a and reaches the light emitting surface 12b while being totally reflected between the two main surfaces 12c and 12d.
Here, for example, in the example of FIG. 2, the light emitted from the LED 14A close to the light incident surface 12a has a short (or no) propagation distance in the air after being emitted from the light emitting surface, and the light incident surface 12a by the air layer. The light reaches the light incident surface 12a without receiving much (or no) diffusion effect in the longitudinal direction. Therefore, upon receiving the light emitted from the LED 14A, the light emitting surface 12b of the light guide plate 12 has a dot shape as shown in FIG. 2B, or a partial region of the entire light emitting surface 12a. It emits red light.

  On the other hand, the outgoing light from the LED 14B far from the light incident surface 12a has a long distance to propagate in the air after being emitted from the light emitting surface, and is greatly affected by the diffusion action in the longitudinal direction of the light incident surface 12b by the air layer. And reaches the light incident surface 12a. Therefore, the light emitting surface 12b of the light guide plate 12 receives light emitted from the LED 14B, and a wider area emits light as shown in FIG. In the example of FIG. 2C, the light emitted from the two LEDs 14B emits light continuously in orange over a wide area near the center of the light emitting surface 12b.

3A, the plurality of LEDs 14A and 14B are arranged in a row, and the light incident surface 12a of the light guide plate 12 has a different distance from the row of point light sources, as shown in FIG. Even in an example in which the protrusion 12aA and the recess 12aB are formed in an uneven shape, the same can be obtained.
Further, as shown in FIG. 3B, the light emitted from the LED 14C located farther from the first light incident surface 12a than the row of the LEDs 14B is emitted from the light incident surface 12b by the air layer. By receiving a larger diffusion effect in the longitudinal direction, the light emitting surface 12b emits light continuously in green over the entire longitudinal direction.

  Further, as shown in FIG. 4A, the light emitted from the LED 14C as the second point light source disposed on the second light incident surface 12f intersecting the light emitting surface 12b is second incident light. The light enters the light guide plate 12 from the light surface 12f, reaches the opposing peripheral end surface 12f while being totally reflected by the two main surfaces 12c and 12d, and is reflected. Further, the light emitted from the LED 14C reaches the first light incident surface 12a where the LEDs 14A and 14B as the first point light sources are disposed from the second light incident surface 12f and is reflected. repeat. And the light which repeated reflection reaches | attains the light emission surface 12b, and is radiate | emitted from the whole light emission surface 12b. That is, the light emitting surface 12b emits green light uniformly by the green emitted light of the LED 14C disposed on the second light incident surface 12f.

As described above, according to the light emitting device 10 according to the embodiment of the present invention, it is possible to realize light emission having different light emission patterns on the light emitting surface 12b. Then, by performing an operation that makes sense for each light emission pattern on the light emitting surface 12b, the light emitting device 10 can be used as a transmission means for various information.
The LED 14C of FIG. 4A as the second point light source may be provided only on one surface of the two surfaces 12f intersecting the light emitting surface 12b, but by being provided on both surfaces as illustrated, The above-described effects are emitted twice from the light emitted from the LED 14C, and uniform light emission of the light emitting surface 12b can be obtained with higher luminance.

Further, the LED 14C of FIG. 4A, which is the second point light source, is positioned in the vicinity of the peripheral end surface (first light incident surface) 12a on which the first point light sources 14A and 14B are arranged. The light emitted from the LED 14C is reflected by the first light incident surface 12a while reaching the opposing peripheral end surface 14f while totally reflecting the two main surfaces 12c and 12d, and the light emitting surface 12b The light going to will increase. Further, even after the light emitted from the LED 14C reaches the opposing peripheral end face 12f and is reflected, the same effect is obtained. Therefore, the brightness of the uniform light emission of the light emitting surface 12b by the LED 14C which is the second point light source is improved.
In the case where a light incident prism extending in the thickness direction of the light guide plate 12 is formed on the first light incident surface 12a of the light guide plate 12, it contributes to dispersing the optical path of the emitted light from the LED 14C. Thus, uniform light emission of the light emitting surface 12b is promoted.

  In addition, the plurality of first point light sources arranged along the first light incident surface 12a facing the light emitting surface 12b is composed of a plurality of LEDs 14A and 14B that emit light independently. Various light emission patterns can be realized by light emission for each of the LEDs 14A and 14B in a dot shape or when light is emitted from a part of the entire light emitting surface 12b. In the example of FIG. 2B, the case where the plurality of red light emitting LEDs 14A emit light at the same time is illustrated, but some of the LEDs 14A may be turned on. Alternatively, the LEDs 14B that emit orange light may be lit individually or simultaneously. Furthermore, it is good also as LED14A, 14B light-emitting simultaneously.

Moreover, as described above, the light emitted from the LEDs 14A and 14B causes the light emitting surface 12b to be punctiform, or red, orange, or a mixed color when a part of the entire light emitting surface 12b emits light. The emission color is different between the emission color composed of the above and the green uniform light emission of the light emitting surface 12b by the light emitted from the LED 14C.
Therefore, by performing an operation that makes sense for each emission color of the light emitting surface 12b, the light emitting device 10 can be used as a means for transmitting various information.

Furthermore, the drivers of the LEDs 14A and 14B, which are the first point light sources, can sequentially control lighting of the plurality of LEDs 14A (14B) from one end to the other end in the longitudinal direction of the light incident surface 12a. . As a result, the point-like light emission of the light emitting surface 12b or the light emission of a part of the entire light emitting surface 12b sequentially moves from one end to the other end in the longitudinal direction.
Therefore, the light-emitting device 10 can be used for various information by performing an operation that makes sense in the red or orange light-emitting direction of the dot-like shape of the light-emitting surface 12b or a part of the entire area. It is also possible to utilize as a means of transmitting information.

  Further, the housing 16A and the circuit board 16B constitute a reflection member 16 that covers the LED 14A, 14B, 14C and the periphery of the light guide plate 12 except for the light emitting surface 12b. Light leaking outside from the peripheral end surfaces 12a and 12f other than the surfaces 12c and 12d and the light emitting surface 12b can also be reflected and re-entered into the light guide plate 12. And the light which reentered in the light-guide plate 12 will contribute to light emission of the light emission surface 12b mentioned above, and it becomes possible to raise light emission luminance.

In the application example shown in FIG. 4B, the angle is set so that the angle formed by the light emitting surface of the LED 14B that emits orange light and the light incident surface 12a of the light guide plate 12 is non-parallel. Has been. On the other hand, the light emitting surface of the LED 14 </ b> A that emits red light and the light incident surface 12 a of the light guide plate 12 are arranged in parallel to each other as in the example of FIG.
In this case, it is possible to finely adjust the position of the light emitting surface 12b that emits light in the form of dots, or the position of a part of the light emitting region for each light emitting element. In the example of FIG. 4B, the orange light emission from one of the LEDs 14B is divided into a left half region 12bL and a right half region 12bR when the light emitting surface 12b is viewed from the front.

  DESCRIPTION OF SYMBOLS 10: Light-emitting device, 12: Light-guide plate, 12a: Light-incidence surface, 12aA: Convex part, 12aB: Concave part, 12b: Light-emitting surface, 12c, 12d: Main surface, 12f: Perimeter end surface orthogonal to light-emitting surface, 14, 14A , 14B, 14C: LED, 16: reflecting member, 16A: housing, 16B: circuit board

Claims (8)

And a peripheral edge surface connecting the two major surfaces and the main surface facing the light guide plate having a rectangular flat plate shape in plan view and have a constant thickness,
A point light source disposed to face at least one of the peripheral end faces of the light guide plate,
One surface of the peripheral end surface excluding the surface where the point light source of the light guide plate is disposed is a light emitting device that constitutes a light emitting surface,
A first point light source disposed on a first light incident surface of the light guide plate facing the light emitting surface;
A second point light source disposed on a second light incident surface intersecting the light emitting surface;
Light emitted from the second point light source enters the light guide plate from the second light incident surface, reaches the opposing peripheral end surfaces while totally reflecting the two main surfaces, and is reflected. In addition, the light reaching the first light incident surface is repeatedly reflected and the reflected light reaches the light emitting surface and is emitted from the entire light emitting surface. The second point light source is located in the vicinity of the first light incident surface on which the first point light source is disposed, and
A plurality of the first point light sources are arranged so as to have different distances from the first light incident surface. The first point light source, the first such that the distance between the incident surface is different, the light-emitting device according to claim 1, characterized in that it is arranged in two or more rows. The first point light source are arranged in a row, the first light incident surface is such that said distance to the first point light source of one row are different, characterized in that it is formed in an uneven shape The light emitting device according to claim 1 . 4. The light emitting device according to claim 1 , wherein a light emission color of the first point light source is different according to a distance from the first light incident surface. 5. The first point light source includes a light emitting surface arranged parallel to the first light incident surface and a light emitting surface arranged non-parallel to the first light incident surface. The light emitting device according to claim 1, wherein the light emitting device is included. 6. The light emitting device according to claim 1, wherein the driver of the first point light source controls lighting of the plurality of first point light sources independently. The first point light sources driver, wherein the first direction from one end in the longitudinal direction of the light incident surface to the other is for sequential lighting control of the plurality of first point light source The light-emitting device according to claim 6. The first, light-emitting device according to any one of the preceding claims, characterized 7, further comprising a reflecting member covering the periphery except the portion constituting the light-emitting surface of the second point light source and the light guide plate.