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Patent Searching and Data


Title:
OPTICAL SCAN DEVICE, ILLUMINATION DEVICE, PROJECTION DEVICE, AND OPTICAL ELEMENT
Document Type and Number:
WIPO Patent Application WO/2015/087934
Kind Code:
A1
Abstract:
[Problem] To improve an effect of reducing speckles without increasing the complexity of a structure. [Solution] This illumination device (40) is provided with: a diffusion member (67) having an anisotropic diffusion face; a rotation shaft member (68) which rotates the anisotropic diffusion face when coherent light from a light source is projected upon the anisotropic diffusion face; and an optical element (50) which further diffuses the coherent light which is diffused with the anisotropic diffusion face. The coherent light which is diffused with the anisotropic diffusion face is linearly diffused. The linear diffused light beam describes a trajectory rotating in one direction on the optical element according to the rotation of the anisotropic diffusion face.

Inventors:
KURASHIGE Makio (1-1, Ichigaya-kaga-cho 1-chome, Shinjuku-k, Tokyo 01, 〒1628001, JP)
Application Number:
JP2014/082750
Publication Date:
June 18, 2015
Filing Date:
December 10, 2014
Export Citation:
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Assignee:
DAI NIPPON PRINTING CO., LTD. (1-1 Ichigaya-kaga-cho 1-chome, Shinjuku-ku Tokyo, 01, 〒1628001, JP)
International Classes:
G02B27/48; G02B19/00; G03B21/14
Foreign References:
JP2012123381A2012-06-28
JP2012237810A2012-12-06
JP2012230360A2012-11-22
JP2010169828A2010-08-05
JP2012237811A2012-12-06
JPH0713094A1995-01-17
JP2012058481A2012-03-22
Other References:
See also references of EP 3081980A4
Attorney, Agent or Firm:
KATSUNUMA Hirohito et al. (Kyowa Patent & Law Office, Nippon Life Marunouchi Building Marunouchi 1-6-6, Chiyoda-k, Tokyo 05, 〒1000005, JP)
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