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Patent Searching and Data


Title:
OPTICAL PHASE CONTROL DEVICE, OPTICAL PHASE CONTROL METHOD, OPTICAL INFORMATION RECORDING/PLAYBACK DEVICE, AND OPTICAL INFORMATION RECORDING/PLAYBACK METHOD
Document Type and Number:
WIPO Patent Application WO/2016/208047
Kind Code:
A1
Abstract:
Provided are a device and a method for the same, the device having a function for rapidly changing only the phase of light without altering the polarization thereof, which is difficult to perform in the conventional device in which nematic liquid crystal or ferroelectric liquid crystal is used. The present invention is provided with a first retardation-adding part for switching a fast axis to at least two directions and imparting a first retardation between the fast axis and the slow axis of incident light, a second retardation-adding part for switching the slow axis to at least two directions and imparting a second retardation, and a fast-axis control part for controlling the fast-axis direction of each of the first retardation-adding part and the second retardation-adding part, the first retardation-adding part and the second retardation-adding part being arranged in superimposed fashion, and the fast-axis control part selecting either a first control state in which the fast axes of the first retardation-adding part and the second retardation-adding part are each controlled to desired directions, or a second control state in which the fast axes of the first retardation-adding part and the second retardation-adding part are controlled to different directions from those of the first control state.

Inventors:
HOSAKA Makoto (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
ISHII Toshiki (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
YAMAZAKI Kazuyoshi (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
Application Number:
JP2015/068441
Publication Date:
December 29, 2016
Filing Date:
June 26, 2015
Export Citation:
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Assignee:
HITACHI, LTD. (6-6 Marunouchi 1-chome, Chiyoda-ku Tokyo, 80, 〒1008280, JP)
International Classes:
G02F1/01; G02F1/13; G03H1/04; G03H1/22; G03H1/26; G11B7/0065
Foreign References:
US6914647B12005-07-05
US5477354A1995-12-19
JP2014002823A2014-01-09
JP2012027996A2012-02-09
Attorney, Agent or Firm:
INOUE Manabu et al. (6-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 20, 〒1008220, JP)
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