Title:
HOLOGRAM REPRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2011/108105
Kind Code:
A1
Abstract:
The disclosed hologram reproduction method is provided with: a step for altering one of either the angle of rotation of an optical information recording medium, wherein a hologram is formed that arises by means of interference of reference light and information light that contains information, around a second axis that is perpendicular to a first axis that is used for performing angular multiplexing recording by changing the rotational angle around the axis, or the angle of incidence of the aforementioned reference light, and radiating the aforementioned reference light onto the aforementioned hologram formed at the aforementioned optical information recording medium while causing rotation around said first axis, producing reproduced light; a step for detecting the aforementioned reproduced light with a photodetector provided with at least two light-receiving regions symmetrically with respect to the light center axis by a dividing line in a direction parallel to the direction of rotation around the aforementioned first axis, and producing an error signal representing the phase difference and the polarity of signals corresponding to the light strength between two light-receiving regions that are symmetrical with respect to the light center axis among the aforementioned at least two light-receiving regions detected by the aforementioned photodetector; and a step for causing rotation of the angle around the aforementioned second axis and controlling said angle in a manner so that the aforementioned error signal becomes zero.
Inventors:
USUI, Takashi (())
碓井 隆 (())
OKANO, Hideaki (())
岡野 英明 (())
碓井 隆 (())
OKANO, Hideaki (())
岡野 英明 (())
Application Number:
JP2010/053573
Publication Date:
September 09, 2011
Filing Date:
March 04, 2010
Export Citation:
Assignee:
KABUSHIKI KAISHA TOSHIBA (1-1 Shibaura 1-chome, Minato-ku Tokyo, 01, 〒1058001, JP)
株式会社 東芝 (〒01 東京都港区芝浦一丁目１番１号 Tokyo, 〒1058001, JP)
USUI, Takashi (())
碓井 隆 (())
OKANO, Hideaki (())
株式会社 東芝 (〒01 東京都港区芝浦一丁目１番１号 Tokyo, 〒1058001, JP)
USUI, Takashi (())
碓井 隆 (())
OKANO, Hideaki (())
International Classes:
G11B7/0065; G03H1/26
Attorney, Agent or Firm:
SUZUYE, Takehiko et al. (1-12-9 Toranomon, Minato-k, Tokyo 01, 〒1050001, JP)
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Claims: