KR20180121611A - Dimming device - Google Patents

Abstract

(PROBLEMS TO BE SOLVED BY THE INVENTION) A light control device capable of efficiently arranging light sources to reduce the area occupied by the device, and to allow other components to be arranged around the light guide, thereby effectively utilizing space.
A first light guide which has an incidence surface and a surface extending in a predetermined direction as an exit surface; and a second light guide which extends in a predetermined direction and has two surfaces facing each other as an incidence surface, Wherein the first light guide and the second light guide are overlapped such that the exit surface and the incident surface are opposed to each other and the light source is opposed to the incidence end face of the first light guide, A light shielding portion is formed between the incident surface and the light source. The light from the light source is guided from the incident end face to the first light guide, and the light emitted from the first light guide is incident on the second light guide.

Description

Dimming device

The present invention relates to a light modulation device using a light guide.

As a ring dimming device, there are an illuminating device described in Patent Document 1 and an illuminating device disclosed in Patent Document 2, and the like. In these devices, the light guide and the light guide plate form an annular or circular plate as seen from a plane, and light emitted from a plurality of light sources arranged around the light guide or the light guide plate is light-guided to realize ring-shaped light emission . The illumination device described in Patent Document 3 includes a plurality of LEDs arranged in an annular shape and a lens assembly formed on the light emitting surface side of the LED and having a lens for condensing the light emitted from the LED in the direction of the central axis of the ring have.

Japanese Unexamined Patent Publication No. 8-202916 Japanese Laid-Open Patent Publication No. 2013-200490 Japanese Laid-Open Patent Publication No. 2006-58409

However, in the illuminating device described in Patent Document 1 and the illuminating device disclosed in Patent Document 2, since a plurality of light sources must be disposed around the light guide and the light guide plate in a plan view in order to obtain ring-shaped light emission, . Further, in the configuration in which light is applied from just below the lens cluster to the upper side of the lens cluster as in the illumination device described in Patent Document 3, the region corresponding to the LED becomes brighter than the other region, There is a problem that light unevenness occurs.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a dimming device capable of efficiently arranging light sources to reduce the area occupied by the device, and to allow other components to be arranged around the light guide, . It is another object of the present invention to provide a light modulation apparatus in which the luminance of the light emitting region is uniform.

According to an aspect of the present invention, there is provided a light modulation apparatus including a light source, a first light guide having an incidence surface and a surface extending in a predetermined direction as an exit surface, and a second light guide extending in a predetermined direction, Wherein the first light guide and the second light guide are overlapped such that the light exit surface and the light entrance surface are opposed to each other, And the light from the light source is guided from the incident end face to the first light guide, and the light emitted from the first light guide is incident on the second light guide And the light-emitting surface emits light.

With this configuration, since the light source can be disposed in the direction in which the first light pipe extends, the arrangement area of the light source can be reduced, and the space can be utilized effectively. Since the light emitted from the light source is not directly incident on the second light guide but is incident on the second light guide after being guided by the first light guide, the occurrence of light unevenness can be suppressed by forming the light shield above the light source have.

 In the light modulation device of the present invention, it is preferable that the second light pipe is provided with a light scattering portion in a region overlapping with the light shielding portion, and the light emitting surface of the second light pipe is luminescent in a region overlapping with the light shielding portion Do.

As a result, it is possible to increase the light intensity at the time of outputting the light guided to the range corresponding to the light source, and as a result, the luminance distribution of the outgoing light from the second light guide can be made constant, can do.

In the light modulation device of the present invention, it is preferable that the first light pipe has a light scattering portion formed on at least one of the light emitting surface and the back surface facing the light emitting surface.

Thus, the light incident from the light source to the first light guide can be easily guided in a predetermined direction, and the luminance distribution of the light emitted from the first light guide can be made uniform.

In the light modulation device of the present invention, it is preferable that a plurality of light sources and a plurality of first light guides are alternately arranged along a predetermined direction.

Thus, even in the configuration in which a plurality of light sources and the first light guide are formed, the space can be effectively utilized.

In the light modulation apparatus of the present invention, it is preferable that the predetermined direction is along a circle, and the second light pipe is annular.

Since a desired planar device can be realized in this manner, a planar shape can be designed in accordance with a necessary space.

In the light modulation device of the present invention, it is preferable that the light-shielding portion has a white surface on the side of the second light pipe.

Thus, light can be efficiently reflected. By changing the color or reflectance of this surface, the luminance distribution of the light-emitting surface of the second light guide can be adjusted.

In the light modulation device of the present invention, the light scattering portion of the second light pipe is a plurality of recessed portions concaved inwardly, and these recessed portions have a larger size and / or a larger depth in the light emitting direction from the light source toward the front .

As a result, it is possible to increase the light intensity at the time of outputting the light guided to the range corresponding to the light source, and as a result, the luminance distribution of the outgoing light from the second light guide can be made constant, can do.

In the light modulation device of the present invention, it is preferable that the light scattering portion of the first light pipe is a plurality of recessed portions recessed inward, and the recesses have a larger size and / or depth as they are further away from the light source.

Thus, the light incident from the light source to the first light guide can be easily guided in a predetermined direction, and the luminance distribution of the light emitted from the first light guide can be made uniform.

In the light modulation device of the present invention, it is preferable that a reflecting portion capable of reflecting light is disposed so as to face the back surface of the first light pipe.

Thereby, the light emitted from the back surface of the first light pipe can be reflected and incident again on the first light pipe, so that the light emitted from the light source can be efficiently used for light control.

In the light modulation device of the present invention, it is preferable that the first light conductor and the second light conductor are held together by a light-transmitting adhesive material.

This makes it possible to reliably hold the first light guide and the second light guide together while suppressing a decrease in the intensity of light traveling from the first light guide through the second light guide.

In the light modulation device of the present invention, a third light guide is provided between the first light guide and the second light guide, wherein one of two surfaces extending in a predetermined direction and facing each other is an incident surface and the other is an exit surface, The light exit surface of the third light guide is opposed to the second light guide, and on the light exit surface, a plurality of recesses extending in a groove shape along a predetermined direction and recessed toward the side away from the second light guide are formed, It is desirable that the size and / or depth increases as the distance from the light source increases.

As a result, it is possible to guide the light incident on the third light guide to a further distance along the predetermined direction, so that the distribution of the incident light intensity on the incident surface of the second light guide can be made uniform.

In the light modulation device of the present invention, it is preferable that the first light guide and the second light guide are sheet-shaped.

As a result, it is possible to easily manufacture a light control device which is easy to be thinned.

According to the present invention, it is possible to provide a light control device capable of effectively arranging a light source and arranging other components around the light guide, thereby effectively utilizing space. Further, it is possible to provide a light modulation apparatus in which the luminance of the light emitting region is uniform.

1 is an exploded perspective view showing a schematic configuration of a light modulation apparatus according to an embodiment of the present invention.
Fig. 2 (A) is a plan view showing the configuration of the light modulation device in Fig. 1, and Fig. 2 (B) is a plan view showing the arrangement of LEDs in a printed board.
Fig. 3 (A) is a plan view showing the configuration of the first light guide according to the embodiment, and Fig. 3 (B) is a bottom view showing the configuration of the first light guide.
Fig. 4 (A) is a plan view showing a configuration of a second light guide according to an embodiment, and Fig. 4 (B) is a bottom view showing a configuration of a second light guide.
Fig. 5 is a vertical sectional view of the cross-section of the cross-section taken along the line A of Fig.
6 is a longitudinal sectional view of a part of the light modulation apparatus according to the modification.
7 is a plan view showing the relationship between the light guiding area of the third light pipe and the corresponding LED in the modification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a light modulation apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is an exploded perspective view showing a schematic structure of a light modulation device 10 according to the present embodiment. 2 (A) is a plan view showing the arrangement of the light modulation apparatus 10, and Fig. 2 (B) is a plan view showing the arrangement of the LEDs 21 to 24 in the printed board 11. 3 (A) is a plan view showing the configuration of the first light guide 30 in the present embodiment, and Fig. 3 (B) is a bottom view showing the configuration of the first light guide 30. 4A is a plan view showing the configuration of the second light guide 60 according to the present embodiment, and Fig. 4B is a bottom view showing the configuration of the second light guide 60. Fig. Fig. 5 is a vertical sectional view of the cross-section of the cross-section taken along the line A of Fig. Here, the plan view is viewed from the upper side in the Z direction shown in each drawing, and the longitudinal sectional view is taken along the Z direction. 1 shows a schematic configuration and does not show the detailed structure of the adhesive tapes 13 and 14 and the first groove portions 61, 62, 63, and 64 on the second light guide 60. FIG. 4B also shows the arrangement of the four light transmitting tapes 41, 42, 43, and 44 and the light shielding tapes 51, 52, 53, and 54 in the second light guide 60 .

1, the light modulation apparatus 10 includes a printed board 11, a reflective tape 12, LEDs (light emitting diodes) 21 to 24, a first light guide 30, a light- Shielding films 41 to 44 and shielding tapes 51 to 54 and the second light conductor 60 are stacked in order in the Z direction (vertical direction). As shown in Fig. 2 (A) And has a toric shape centered on the central axis AX. The light modulation apparatus 10 is a light emitting device that guides illumination light emitted from the LEDs 21, 22, 23, and 24 and emits illumination light upward from the uppermost second light pipe 60, that is, upward in the Z direction , A light control device for illuminating an object, and also functions as a lighting device for illuminating a target space or the like. Hereinafter, each component will be described.

As shown in Figs. 1 and 2B, the printed board 11 is formed in a toric shape having a central axis AX as a center, and a reflective tape 12 and an LED (light source) 21, 22, 23, and 24 are fixed. The LEDs 21, 22, 23 and 24 are disposed at equi-angular intervals with respect to the center axis AX, and as shown by the arrows in Fig. 2B, ) (Predetermined direction). The reflective tape 12 is disposed between the four LEDs 21, 22, 23, and 24 of the printed board 11 along the circumferential direction C, And reflects the incident light.

Adhesive tapes 13 and 14 are fixed to both ends of the upper surface of the reflective tape 12 in the circumferential direction C as shown in Fig. 5, and the adhesive tapes 13 and 14 fix the first The end portion of the light guide body 30 is fixed and the first light guide body 30 is disposed above the reflective tape 12. [ This configuration is also the same in the range other than the range shown in Fig.

3 (A) and 3 (B), the first light conductor 30 is formed in a substantially annular shape along the circumferential direction C as shown in Figs. 3A and 3B. The first light conductor 30 is made of a polycarbonate or polyurethane, Shape. The upper surface 30t (surface) facing the bottom surface 60r of the second light guide 60 serves as an emission surface in the first light guide 30. The first light conductor 30 has openings 30a, 30b, 30c, and 30d having a substantially rectangular shape in plan view at equi-angular intervals with respect to the central axis AX. The outer shape of the first light guide 30 in plan view corresponds to the outer shape of the printed board 11. [ The openings 30a to 30d of the first light guide 30 are arranged at positions corresponding to the LEDs 21 to 24 respectively and the LEDs 21 to 24 are accommodated in the openings 30a to 30d respectively. In the present embodiment, the first light conductor 30 is formed in a substantially annular shape, but it may be formed of a part having a substantially circular arc shape divided at the portions of the openings 30a to 30d.

As shown in Fig. 3 (A), the first light guide 30 has four light guide regions 31, 32, 33 and 34 in the circumferential direction C thereof. The light guiding area 31 corresponds to the area between the two LEDs 21 and 22 and the light guiding area 32 corresponds to the area between the two LEDs 22 and 23 and the light guiding area 33 corresponds to the area between the two LEDs 21 and 22 Corresponds to the area between the LEDs 23 and 24, and the light-guiding area 34 corresponds to the area between the two LEDs 24 and 21. That is, the LEDs 21, 22, 23, and 24 and the light guiding regions 31, 32, 33, and 34 are alternately arranged in the circumferential direction C.

As described above, the light guiding regions 31 to 34 of the first light guide 30 are placed between the two LEDs in the circumferential direction C, and one of the light guiding regions 31 to 34 in the circumferential direction C of the light guiding region The cross section faces the emitting surface of one LED and the other cross section faces the back surface (non-emitting surface) of the other LED. 5, the incident surface 31a, which is an end surface in the circumferential direction C of the light guiding region 31, faces the emitting surface 21a of the LED 21, (31b) is opposed to the back surface (22b) of another LED (22). Thus, the light emitted from the LED 21 is incident into the light guide region 31 from the incident end face 31a.

As shown in Fig. 3 (B), on the lower surfaces 31r, 32r, 33r and 34r of the light guide regions 31, 32, 33 and 34 of the first light guide 30, Concave second trenches 31c, 32c, 33c, and 34c are formed, respectively. The second trenches 31c, 32c, 33c, and 34c are respectively formed so as to be arranged in the circumferential direction C and each extend substantially perpendicular to the circumferential direction C. Each of the two trenches 31c, 32c, 33c, and 34c is formed such that the depth of the groove and the width in the circumferential direction C become larger as the distance from the LED in which light enters the corresponding light guide region increases .

5, the second trench 31c is formed so that the depth of the groove and the width in the circumferential direction C become smaller as the distance from the LED 21 into which light enters the light guide region 31 increases, As shown in Fig. The depth and width of the groove of the second groove portion 31c are set to correspond to the distance from the LED 21. Since the reflective tape 12 is disposed below the second trench 31c, the light emitted downward from the light guiding region 31 is reflected by the reflective tape 12 and enters the light guiding region 31 again . In the above configuration, the substantial thickness of the first light pipe 30 becomes smaller as the distance from the LED 21 in the circumferential direction C is made so that the light is easily emitted upward from the first light pipe 30 The intensity of the emitted light can be secured even at a position far from the LED 21 and the intensity of the light emitted upward from the upper surface 31t of the light guide region 31 can be adjusted to be uniform in the circumferential direction C have. This configuration and operation effects are the same in the range other than the range shown in Fig. In the present embodiment, the groove-shaped second trenches 31c, 32c, 33c, and 34c are formed as the light scattering portions, but a plurality of inwardly concave shapes may be arranged in a point shape.

1, transmissive tapes 41, 42, 43, and 44 are disposed on the upper surfaces of the light guide regions 31, 32, 33, and 34 of the first light guide 30, respectively. The transparent tapes 41, 42, 43, and 44 are fixed to the light guide regions 31, 32, 33, and 34 by the adhesive property of the adhesive material, and the upper surfaces thereof are fixed to the second light guide 60, Respectively. The regions where the light-transmitting tapes 41, 42, 43 and 44 are fixed are the emission regions on the surfaces (emission surfaces) of the light guide regions 31, 32, 33 and 34 of the first light guide 30 And the bottom surface 60r of the second light guide body 60 (the back surface and the incident surface), the incident light is transmitted through the light exit area of the first light guide 30 and the second light guide (60).

As shown in Fig. 1, on the upper sides of the LEDs 21, 22, 23, and 24 and the openings 30a, 30b, 30c, and 30d of the first light pipe 30, (51, 52, 53, 54) are arranged. The light shielding tapes 51, 52, 53 and 54 extend to the front of the transparent tape 41 in the circumferential direction C. The ends of the light-shielding tapes 51, 52, 53, and 54 extend over the ends of the first light pipe 30 in the circumferential direction C. Here, This makes it possible to prevent strong light such as reflected light from the incidence end face of the first light pipe 30 from being directly incident on the second light pipe 60.

The light shielding tapes 51, 52, 53 and 54 are bonded to the ends of the light guiding regions 31, 32, 33 and 34 at least on the lower surface by the adhesiveness of the surfaces thereof, And the upper surface thereof is coupled to the second light guide 60, respectively. The light-shielding tapes 51, 52, 53 and 54 are arranged in such a manner that the light from below, that is, the light emitted from the LEDs 21, 22, 23 and 24 does not pass through the first light guide 30, 60). ≪ / RTI > The upper surface of the light-shielding tapes 51, 52, 53, and 54 is preferably coated with a white or reflective coating so that the light guided through the second light guide 60 can be reliably reflected upward And the LEDs 21 to 24 can be prevented from being viewed from above.

The second light pipe 60 is disposed above the first light pipe 30 with the light transmitting tapes 41 to 44 and the light shielding tapes 51 to 54 interposed therebetween. The second light guide 60 is formed in a sheet form, for example, of polycarbonate or polyurethane, and has a toric shape corresponding to the outer shape of the printed board 11 and the first light guide 30 in plan view . As described above, the light transmitted through the light-transmitting tape 41 is incident on the second light guide 60, and the light is guided in the circumferential direction C to be emitted from the upper surface 60t (light emitting surface) Light is emitted upward, and the upper surface 60t emits light.

As shown in Fig. 4 (A), first grooves 61, 62, 63, and 64 recessed inward as light scattering portions are formed on the upper surface 60t of the second light pipe 60. [ The first trenches 61, 62, 63 and 64 are formed to correspond to the upper portions of the light-shielding tapes 51, 52, 53 and 54 and the LEDs 21, 22, 23 and 24, respectively. In other words, the first trenches 61, 62, 63 and 64 are formed in a region of the second light pipe 60 overlapped with the light-shielding tape 51. The first groove portions 61, 62, 63, 64 are each formed so as to be lined up in the circumferential direction C and each extend substantially perpendicular to the circumferential direction C. In this configuration, the emitted light from any of the LEDs is guided by the first light guide 30 and enters the second light guide 60, and is emitted along the circumferential direction C in the second light guide 60 And reaches the region corresponding to the LED located on the front side (downstream side, away from the LED) of the light from the LED in the emitting direction, and is emitted to the outside from the first groove portion located above the LED.

The first groove portions 61, 62, 63, and 64 each have a depth in the direction of the groove and a circumferential direction C (the distance from the light source) toward the front side in the light emitting direction from the LED located downward, Is formed to have a larger width. Thus, light emitted to the outside from the first trenches 61, 62, 63, and 64 is easier to emit toward the front side in the light emitting direction, so that the emitted light intensity can be secured even at a position far from the LED So that the intensity of the light emitted to the outside from the first trenches 61 to 64 is uniform in the circumferential direction C including the flat portion of the top surface 60t of the second light conductor 60. [ Can be adjusted.

5, a first groove portion 61 is disposed above the LED 21 and the light-shielding tape 51. The first groove portion 61 is located on the front side in the traveling direction of the outgoing light from the LED 21 That is, in the right side in Fig. 5, the depth in the groove and the width in the circumferential direction C are increased. The first groove portion 62 disposed above the LED 22 and the light shielding tape 52 also has a larger depth in the forward direction of the emitted light from the LED 22, And the width in the circumferential direction C becomes larger. By forming the first trenches 61 and 62 in this manner, light emitted from the LED 21 and guided in the light guide region 31 and incident on the second light guide 60 through the transparent tape 41, The intensity of light emitted to the outside from the planar upper surface 60t and the light emitted from the first groove portion 62 above the LED 22 through the refraction, reflection, scattering, . This configuration and operation effects are the same in the range other than the range shown in Fig.

According to the above-described embodiment, the following effects can be obtained in the constitution as described above.

(1) The LEDs 21 to 24 as the light sources and the light guide areas 31 to 34 of the first light guide 30 are arranged alternately along the circumferential direction C and the light emitted from the LEDs 21 to 24 Light is emitted from one end surface in the circumferential direction C of the light guide region and emitted from the upper surface 30t along the circumferential direction C toward the second light guide 60, The light is guided to the upper surface 60t side and is emitted to the outside. With this configuration, it is possible to reduce the area occupied by the LEDs 21 to 24 and the first light guide 30 and efficiently arrange them. Space can be used effectively.

(2) Since the light-shielding tapes 51 to 54 are disposed between the LEDs 21 to 24 and the second light-guiding body 60, they are not incident on the first light-guiding body 30, Since light having a high light intensity is not directly incident on the second light guide 60, the brightness of light emitted from the second light guide 60 can be made uniform and the occurrence of light unevenness can be suppressed.

(3) Since the first grooves 61 to 64 are formed at positions corresponding to the LEDs 21 to 24 of the second light guide 60, the first grooves 61 to 64 ) Can be increased, and as a result, the luminance distribution of the outgoing light from the second light guide 60 can be made constant.

(4) By forming the second trenches 31c to 34c in the first light guide 30, light incident from the LEDs 21 to 24 into the first light guide 30 is guided along the circumferential direction C It becomes easy to make the luminance of the emitted light uniform in the circumferential direction C.

(5) Since the reflective tape 12 is formed, the light leaked downward from the first light pipe 30 can be reflected and incident on the first light pipe 30 again. Therefore, It is possible to effectively use the outgoing light of the light source for dimming.

Modifications will be described below.

In the above embodiment, the first light conductor 30 and the second light conductor 60 are made separate from each other through the transparent tape 41. Alternatively, instead of forming the light transmissive tape 41, The first light guide body 60 and the first light guide body 30 may be integrally formed.

Although the light modulating device having an annular planar shape is shown in the above embodiment, the direction in which the first light guide, the second light guide, etc. are extended is not limited to the circumferential direction of the torus, but may be, for example, a U shape .

In the above embodiment, the number of the LEDs and the light guide region is set to 4. However, this number is not limited to four.

The light-transmitting tape and the light-shielding tape may be layers other than the tape, for example, a layer formed by printing.

If the light does not interfere with the progress of light from the first light guide 30 to the second light guide 60, a layer other than the light transmissive tape 41 may be interposed between the first light guide 30 and the second light guide 60, . For example, the third light pipe shown in Figs. 6 to 7 may be disposed. Here, FIG. 6 is a longitudinal sectional view of a part of the light modulation apparatus according to the modification. 7 is a plan view showing the relationship between the light guide region of the third light pipe 130 and the corresponding LED 121 in this modification. 6 is a vertical sectional view showing a section of a range corresponding to the light guide region 131 of the third light guide 130, as viewed in a circumferential direction.

6 to 7, an adhesive tape 113, 114 is disposed on the upper surface of the light guide area 31 of the first light guide 30, and the light guide area of the third light guide 130 (Not shown). This light guiding area 131 has the same outer shape as the light guiding area 31 of the first light conductor 30 in plan view, and both are arranged so as to face up and down. The incident face 131a which is one end face of the light guide region 131 faces the emitting face 121a of the LED 121 and the other end face 131b faces the back face 122b of another LED 122 Slope). Thus, the outgoing light from the LED 121 is incident into the light guide region 131 from the incident end face 131a. On the other hand, the light incident from the LED 121 to the light guide region 31 is emitted from the upper surface 31t (light exit surface) of the light guide region 31 and enters the bottom surface 131e.

The light guide region of the third light guide body 130 is formed in the same configuration and arrangement as the light guide region 131 with respect to the other light guide regions 32, 33 and 34 of the first light guide body 30. The constituent materials and characteristics of the third light guide 130 are the same as those of the first light guide 30. In this modified example, the adhesive tapes 113 and 114 have the same material and construction as those of the adhesive tapes 13 and 14 shown in Fig. 5, and are disposed above the adhesive tapes 13 and 14. Fig.

6 or 7 as the light scattering portion, the third light guide body 130 includes a plurality of third groove portions 131c extending in a groove shape parallel to each other along the circumferential direction C and recessed inwardly, (Concave portion). The third trench 131c is recessed toward the printed board 11 side, that is, toward the side away from the second light guide 60, and is deeper as it is stepped away from the LED 121 .

It is possible to make the second light pipe 60 extend from the light guiding region 131 to the second light pipe 140 because the incident light from the LED 121 can be guided along the circumferential direction C by forming the third groove 131c having the above- It is possible to make the intensity of the emitted light to be uniform in the circumferential direction C. This configuration and operation effects are the same in the range other than the ranges shown in Figs.

In Figs. 6 to 7, the example in which the third trench 131c is composed of five trenches G1 to G5 is shown, but the number of tiers is not limited thereto. The shape of the third groove portion is not limited to the shapes shown in Figs. 6 to 7 as long as it extends stepwise along the circumferential direction C. Fig. Furthermore, the third light guide body 130 may not be formed, and the upper surface 30t of the first light guide body 30 may be provided with the same stepped groove portion as the third groove portion 131c as the light scattering portion.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above-described embodiments, but can be modified or changed within the scope of the object of the improvement or the spirit of the present invention.

Industrial availability

As described above, the light modulation apparatus according to the present invention is useful in that a light source can be efficiently disposed, and the space around the light guide can be utilized effectively.

10: Dimmer
11: printed board
12: Reflective tape
13, 14: Adhesive tape
21, 22, 23, 24: LED (light source)
21a: exit surface
22b:
30: First light conductor
30a, 30b, 30c, 30d:
30t, 31t: Top surface (surface, emission surface)
31r, 32r, 33r, and 34r:
31, 32, 33, 34: light-guiding areas
31a: incidence section
31b: cross section of the other side
31c, 32c, 33c, and 34c: a second groove portion (light scattering portion)
41, 42, 43, 44: Transparent tape
51, 52, 53, 54: shielding tape (shielding portion)
60: second light guide body
60t: upper surface (light emitting surface)
60r: bottom surface (back surface, incident surface)
61, 62, 63, 64: first groove portion (light scattering portion)
113, 114: Adhesive tape
121 and 122: LED (light source)
121a: exit surface
122b:
130: third light conductor
131: light-
131a: incidence section
131b: cross section of the other
131c: third groove
131e: bottom surface
131m: light-guiding material
AX: center axis
C: circumferential direction (predetermined direction)

Claims (12)

A light source,
A first light guide having an incidence surface and a surface extending in a predetermined direction as an exit surface,
And a second light guide which extends in the predetermined direction and is opposed to each other and one of the two surfaces is an incident surface and the other is a light emitting surface,
The first light pipe and the second light pipe are overlapped so that the exit face and the entrance face are opposed to each other,
Wherein the light source faces the incident end face of the first light pipe,
A light shielding portion is formed between the incident surface of the second light pipe and the light source,
Wherein the light from the light source is guided from the incident end face to the first light guide and the light emitted from the first light guide is incident on the second light guide and the light emission surface emits light. The method according to claim 1,
Wherein a light scattering portion is formed in an area overlapping the light shielding portion of the second light pipe and the light emitting surface of the second light pipe is lighted in a region overlapping the light shielding portion, Device. 3. The method according to claim 1 or 2,
Wherein the first light pipe has a light scattering portion formed on at least one of the light emitting surface and the back surface opposite to the light emitting surface. 4. The method according to any one of claims 1 to 3,
Wherein a plurality of light sources and a plurality of first light guides are alternately arranged along the predetermined direction. 5. The method according to any one of claims 1 to 4,
Wherein the predetermined direction is along a circle, and the second light pipe is formed in an annular shape. 6. The method according to any one of claims 1 to 5,
Wherein the light-shielding portion has a white surface on the side of the second light pipe. 7. The method according to any one of claims 2 to 6,
Wherein the light scattering portion of the second light pipe is a plurality of recessed portions concaved inward and the recesses have a larger size and / or a larger depth toward the front side in the light output direction from the light source. 8. The method according to any one of claims 3 to 7,
Wherein the light scattering portion of the first light pipe is a plurality of recessed portions recessed inward, and the recessed portions are larger in size and / or depth as they are away from the light source. 9. The method according to any one of claims 3 to 8,
Wherein a reflecting portion capable of reflecting light is disposed so as to face the back surface of the first light pipe. 10. The method according to any one of claims 1 to 9,
Wherein the first light guide and the second light guide are held together by an adhesive material having light transmittance. 11. The method according to any one of claims 1 to 10,
And a third light guiding body extending between the first light guiding body and the second light guiding body, wherein one of two surfaces extending in the predetermined direction and facing each other is an incident surface and the other is an exiting surface,
The outgoing surface of the third light pipe is opposed to the second light pipe and a plurality of concave portions extending in a groove shape along the predetermined direction and recessed toward the side away from the second light pipe are formed on the outgoing face , And the concave portion has a larger size and / or a larger depth as the distance from the light source increases. 12. The method according to any one of claims 1 to 11,
Wherein the first light guide and the second light guide are sheet-shaped.

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