Title:
ANGLE CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2011/013172
Kind Code:
A1
Abstract:
An angle control method has: a step wherein reproducing light (S) is taken out by applying reference light (R) to a hologram formed on an optical information recording medium (200), while rotating about a Y axis the optical information recording medium (200) having thereon the hologram generated due to interference between information light (I) and the reference light (R), by changing an rotating angle about the X axis or an angle at which the reference light (R) enters; a step wherein the reproducing light (S) is detected by using a photodetector (185) provided with two light receiving regions, which are formed by equally and symmetrically dividing a region with respect to the center of the optical axis, and error signals are taken out from the two light receiving regions detected by the photodetector (185); and a step wherein the angle is controlled by rotating the Y axis so that there is no error signal.
Inventors:
USUI TAKASHI
OKANO HIDEAKI
OKANO HIDEAKI
Application Number:
PCT/JP2009/003603
Publication Date:
February 03, 2011
Filing Date:
July 30, 2009
Export Citation:
Assignee:
TOSHIBA KK (JP)
USUI TAKASHI
OKANO HIDEAKI
USUI TAKASHI
OKANO HIDEAKI
International Classes:
G11B7/0065; G03H1/26; G11B7/135
Foreign References:
| JP2009080888A | 2009-04-16 | |||
| JP2007293309A | 2007-11-08 | |||
| JP2009146542A | 2009-07-02 |
Attorney, Agent or Firm:
SAGOI MASAYUKI (JP)
Masayuki Sunai (JP)
Masayuki Sunai (JP)
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