Polygonally-shaped reflection member having inclined vertex portions for reflecting light from a light source

• US 10,458,622 B2
• Filed: 10/20/2015
• Issued: 10/29/2019
• Est. Priority Date: 12/16/2014
• Status: Active Grant

• Current Assignee: Enplas Corporation
• Original Assignee: Enplas Corporation
• Inventors: Nakamura, Kakeru
• Primary Examiner(s): Negron, Ismael
• Application Number:
  US15/534,096
• Publication Number:
  US 20170343187A1
• Time in Patent Office: 1,470 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

A reflection member includes at least one polygonal cell having a polygonally-shaped center bottom part in which a light source is disposed, vertex-part inclined surfaces provided so as to correspond to the respective vertexes of the polygonal shape, and side-part inclined surfaces provided between the corresponding vertex-part inclined surfaces, such that an inclination angle α of at least a part of the vertex-part inclined surfaces to the center bottom part is larger than an inclination angle β of the side-part inclined surfaces to the center bottom part.

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 comprises;

a center bottom portion orthogonal to an optical axis and configured to receive the light source; and

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

wherein 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

in cross-sectional view, an acute inclined angle α

of at least a part of the vertex-portion inclined surface to a reference plane orthogonal to the optical axis and coplanar with the center bottom portion is larger than an acute inclined angle β

of the side-portion inclined surface to the reference plane.

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

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

.

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

.

5. 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.

6. The reflection member according to claim 5, wherein the vertex-portion inclined surface has a plane with the inclined angle α

.

7. The reflection member 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.

8. The reflection member according to claim 7, wherein the vertex-portion inclined surface has a plane with the inclined angle α

.

9. An illumination device, comprising:

a light source; and

a reflection member for reflecting light emitted from the light source, the reflection member comprising at least one polygonal cell of a polygonal shape in plan view, and the polygonal cell comprises;

a center bottom portion orthogonal to an optical axis and on which the light source is arranged; and

an inclined portion inclined from the center bottom portion toward an outer rim, the inclined portion having 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

wherein, in cross-sectional view, an acute inclined angle α

of at least a part of the vertex-portion inclined surface to a reference plane orthogonal to the optical axis and coplanar with the center bottom portion is larger than an acute inclined angle β

of the side-portion inclined surface to the reference plane.

10. The illumination device according to claim 9, 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.

11. The illumination device according to claim 9, 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.

12. A surface light source device, comprising:

the illumination device according to claim 9; and

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

13. A display device, comprising:

the surface light source device according to claim 12; and

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

14. Electronic equipment, comprising the display device according to claim 13 as a display unit.

15. The illumination device according to claim 9, 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.

16. The illumination device according to claim 15, 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.

17. The illumination device according to claim 15, 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.

18. The illumination device according to claim 17, 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.