Reflection Member, Illumination Device, Surface Light Source Device, Display Device, and Electronic Apparatus

• US 20170343187A1
• Filed: 10/20/2015
• Published: 11/30/2017
• Est. Priority Date: 12/16/2014
• Status: Active Grant

• Current Assignee: Enplas Corporation
• Original Assignee: Enplas Corporation
• Inventors: NAKAMURA, Kakeru
• Granted Patent: US 10,458,622 B2
• Time in Patent Office: Days
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21V 7/00 Reflectors for light sources characterised by cooling arrangements F21V29/505
• CPC Class Codes: F21V 7/0083 Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane combination of two or more reflectors F21V7/0025
• CPC Class Codes: F21V 7/04 Optical design
• CPC Class Codes: F21Y 2105/16 square or rectangular, e.g. for light panels
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 19/0066 in the form of an LED array
• CPC Class Codes: G02B 5/09 Multifaceted or polygonal mirrors , e.g. polygonal scanning mirrors; Fresnel mirrors
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G09F 13/04 Signs, boards or panels, illuminated from behind the insignia

Abstract

To provide a reflection member for forming a polygonal irradiated region. Solution: A reflection member for reflecting light emitted from a light source comprises: at least one polygonal cell, the at least one polygonal cell having: a center bottom part which has a polygonal shape in a plan view and in which the light source is disposed; and an inclined part which is inclined from the center bottom part toward the outer edge, wherein the inclined part has: vertex-part inclined surfaces which are provided so as to correspond to the respective vertexes of the polygonal shape; and side-part inclined surfaces which are each provided between the corresponding vertex-part inclined surfaces, and wherein an inclination angle α of at least a part of the vertex-part inclined surfaces is larger than an inclination angle β of the side-part inclined surfaces in a cross-sectional view.

Claims

1. A reflection member for reflecting light emitted from a light source, comprising:

at least one polygonal cell of a polygonal shape in plan view, which has;

a center bottom portion on which the light source is arranged; and

an inclined portion inclined from the center bottom portion toward an outer rim;

the inclined portion has a vertex-portion inclined surface provided correspondingly to each vertex of the polygonal shape, and a side-portion inclined surface provided between two of the vertex-portion inclined surfaces; and

an inclined angle α

of at least a part of the vertex-portion inclined surface is larger than an inclined angle β

of the side-portion inclined surface in cross-sectional view.

2. The reflection member according to claim 1, wherein:

the highest point of the vertex-portion inclined surface of the polygonal cell is higher than the highest point of the side-portion inclined surface in cross-sectional view.

3. The reflection member according to claim 1, wherein:

the reflection member includes a plurality of the polygonal cells, and an outer rim of each polygonal cell is arranged to be adjacent to each other.

4. The reflection member according to claim 1, wherein:

the vertex-portion inclined surface has a plane with the inclined angle α

.

13. The reflection member according to claim 2, wherein the reflection member includes a plurality of the polygonal cells, and an outer rim of each polygonal cell is arranged to be adjacent to each other.

14. The reflection member according to claim 2, wherein the vertex-portion inclined surface has a plane with the inclined angle α

.

15. The reflection member according to claim 3, wherein the vertex-portion inclined surface has a plane with the inclined angle α

.

16. The reflection member according to claim 13, wherein the vertex-portion inclined surface has a plane with the inclined angle α

.

5. An illumination device, comprising a light source and a reflection member for reflecting light emitted from the light source, wherein:

the reflection member includes at least one polygonal cell of a polygonal shape in plan view, and the polygonal cell has;

a center bottom portion on which the light source is arranged; and

an inclined portion inclined from the center bottom portion toward an outer rim;

the inclined portion has a vertex-portion inclined surface provided correspondingly to each vertex of the polygonal shape, and a side-portion inclined surface provided between two of the vertex-portion inclined surfaces; and

an inclined angle α

of at least a part of the vertex-portion inclined surface is larger than an inclined angle β

of the side-portion inclined surface in cross-sectional view.

6. The illumination device according to claim 5, comprising a light flux controlling member for controlling the light emitted from the light source to be a light flux of a predetermined distribution state.

7. The illumination device according to claim 6, wherein:

the predetermined distribution state has a peak in direction of a predetermined angle from a reference surface; and

the predetermined angle is smaller than the inclined angle β

of the side-portion inclined surface.

8. The illumination device according to claim 5, wherein:

the highest point of the vertex-portion inclined surface of the polygonal cell is higher than the highest point of the side-portion inclined surface in cross-sectional view.

9. The illumination device according to claim 5, wherein:

the reflection member includes a plurality of the polygonal cells; and

an outer rim of each polygonal cell is arranged to be adjacent to each other.

10. A surface light source device, comprising:

the illumination device according to claim 5; and

a diffusion member provided on a light emission side of the illumination device.

11. A display device, comprising:

the surface light source device according to claim 10; and

an illuminated member which is irradiated with light from the surface light source device.

12. Electronic equipment, comprising the display device according to claim 11 as a display unit.

17. The illumination device according to claim 6, wherein the highest point of the vertex-portion inclined surface of the polygonal cell is higher than the highest point of the side-portion inclined surface in cross-sectional view.

18. The illumination device according to claim 7, wherein the highest point of the vertex-portion inclined surface of the polygonal cell is higher than the highest point of the side-portion inclined surface in cross-sectional view.