Holographic optical pickup device, optical information recording and reproducing device, and method of recording and reproducing optical information
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United States of America Patent
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May 27, 2014
Grant Date -
Dec 5, 2013
app pub date -
May 31, 2013
filing date -
Jun 1, 2012
priority date (Note) -
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Abstract
An optical pickup device includes a galvanometer mirror that changes an incident angle of a reference beam to an optical information recording medium, an image sensor that detects a diffracted beam from a region to be reproduced upon irradiation of the recording medium with the reference beam, and sets the detected diffracted beam to a reproduction signal, and a photodetector that detects the diffracted beam generated from a plurality of recorded regions upon irradiation of the recording medium with the reference beam. The photodetector includes a plurality of light receivers, and generates an angular error signal indicating positional shifting of the incident angle of the reference beam from a differential signal of a plurality of signals derived from the respective light receivers so as to control the angle of the galvanometer mirror.
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