Recording and reproducing device, recording and reproducing method, recording device, recording method, reproducing device and reproducing method
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United States of America Patent
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Nov 6, 2012
Grant Date -
Oct 29, 2009
app pub date -
May 1, 2008
filing date -
Jul 12, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A technique for recording data onto a hologram recording medium using spatial light phase modulation corresponding to the recording data, and a technique for reproducing recorded data by properly reading information on phases recorded on a hologram recording medium. A signal beam having a phase modulation pattern corresponding to recording data and a reference beam having a specific phase modulation pattern are applied to the recording medium. Thus, recording data can be recorded onto the hologram recording medium using phase information. In addition, at the time of reproduction, a reference beam and a direct current (DC) beam, whose phase difference with respect to the reference beam is π/2, are applied to the hologram recording medium. By reading the reproduction beam to which the DC beam is added, recorded information on phases can be correctly read, and recorded data can be reproduced in accordance with the phase information.
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