Title:
DIFFRACTION TYPE CONDENSING FILM AND SURFACE LIGHT SOURCE DEVICE USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2006/011268
Kind Code:
A1
Abstract:
Provided are an easy-to-handle thin diffraction type condensing film exhibiting high light transmissivity and condensation ability, and a surface light source device using the film. A hologram optical element using diffraction/interference phenomena based on wave properties of light is used instead of a conventional prism sheet using refraction. As a result, the diffraction type condensing film and the surface light source device have high light transmissivity and are thin. In the diffraction type condensing film, dependence of bending angle on wave length is low and light entering from an oblique direction is bent in the vertical direction and emitted with spectral separation of white light suppressed. High condensation impossible in a conventional optical element is realized by suppressing angular variation in emission light for angular variation in incident light.
Inventors:
KOMATSU TOKUTARO (JP)
AWANO YASUHIKO (JP)
AWANO YASUHIKO (JP)
Application Number:
PCT/JP2005/005415
Publication Date:
February 02, 2006
Filing Date:
March 24, 2005
Export Citation:
Assignee:
HITACHI CHEMICAL CO LTD (JP)
KOMATSU TOKUTARO (JP)
AWANO YASUHIKO (JP)
KOMATSU TOKUTARO (JP)
AWANO YASUHIKO (JP)
International Classes:
F21V8/00; F21Y101/02; G02B5/18; G02B5/32; G02F1/13357; (IPC1-7): G02B5/18; F21V8/00; G02B5/32; G02F1/13357; F21Y101:02
Foreign References:
| JPH10506500A | 1998-06-23 | |||
| JP2002352611A | 2002-12-06 | |||
| JPH06109925A | 1994-04-22 |
Attorney, Agent or Firm:
Miyoshi, Hidekazu (2-8 Toranomon 1-chome, Minato-k, Tokyo 01, JP)
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