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

Patent metadata

Field	Value
Publication number	US-10458622-B2
Application number	US-201515534096-A
Country	US
Kind code	B2
Filing date	Oct 20, 2015
Priority date	Dec 16, 2014
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

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.

First claim

What is claimed is:

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.

Assignees

• Enplas Corp

Inventors

• NAKAMURA Kakeru

Classifications

• G02B5/09

  Multifaceted or polygonal mirrors {, e.g. polygonal scanning mirrors; Fresnel mirrors} · CPC title

• F21V7/00

  Reflectors for light sources (characterised by cooling arrangements F21V29/505) · CPC title

• G09F13/04

  Signs, boards or panels, illuminated from behind the insignia · CPC title

• F21V7/0083

  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 title

• F21V3/00

  Globes; Bowls; Cover glasses (with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506) · CPC title