Surface light source device for recording/reproducing holograms

Patent metadata

Field	Value
Publication number	US-9256203-B2
Application number	US-201414494116-A
Country	US
Kind code	B2
Filing date	Sep 23, 2014
Priority date	Oct 22, 2010
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A surface light source device is provided. The surface light source device includes a light source, a beam splitter configured to split a light irradiated from the light source into a plurality of light beams each having a different path, a diffusion unit configured to diffuse the plurality of light beams split by the beam splitter into a surface light, and a collimating unit configured to arrange the plurality of light beams diffused from the diffusion unit in one direction.

First claim

What is claimed is:

1. A surface light source device comprising:
a light source;
a beam splitter configured to split a light irradiated from the light source into a plurality of light beams each having a different path;
a diffusion unit configured to diffuse the plurality of light beams split by the beam splitter into a surface light;
a collimating unit configured to arrange the plurality of light beams diffused from the diffusion unit in one direction; and
an optical mask configured to change a beam intensity distribution of a beam collimated by the collimating unit, at a cross-section of the beam,
wherein the optical mask has a non-uniform light transmittance distribution, and the light transmittance distribution is determined so that a relatively low light transmittance occurs in an area that corresponds to an area where beam intensity is relatively high in comparison to other areas.

2. The device of claim 1 , wherein the diffusion unit comprises a plurality of pin holes respectively corresponding to the plurality of light beams.

3. The device of claim 2 , wherein the collimating unit comprises a lens array comprising a plurality of convex lens units.

4. The device of claim 3 , wherein the plurality of convex lens units are formed to respectively correspond to the plurality of pin holes.

5. The device of claim 4 , wherein the plurality of convex lens units have sizes respectively corresponding to a cross-section of the plurality of light beams diffused while passing through the plurality of pin holes.

6. The device of claim 1 , wherein the beam splitter comprises a plurality of cubic beam splitters.

7. A device for recording/reproducing holograms using the surface light source device of claim 1 as a recording light or reproducing light.

8. The device of claim 1 , wherein the non-uniform light transmittance distribution is configured to modify the beam such that a uniform beam intensity distribution is generated.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Choi Kyu-Hwan
• Lee Hong-Seok
• Song Hoon
• Choi Yoon-Sun
• Bae Jung-Mok

Classifications

• G03H1/02

  Details {of features involved during the holographic process; Replication of holograms without interference recording} · CPC title

• G03H2222/35

  Transverse intensity distribution of the light beam · CPC title

• G02B27/0933

  Systems for active beam shaping by rapid movement of an element · CPC title

• G02B27/0977

  Reflective elements · CPC title

• F21V13/00

  Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00 (controlling the distribution of the light emitted by adjustment of elements F21V14/00) · CPC title