Tracking error detecting apparatus for use in multibeam optical disk device
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United States of America Patent
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May 11, 1993
Grant Date -
N/A
app pub date -
Jan 17, 1991
filing date -
May 18, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a multi-beam optical disk device in which a signal is recorded on or reproduced from an optical disk by means of a plurality of light beams, a tracking error detecting apparatus is constructed such that the plurality of light beams projected from an optical head are made incident upon the optical disk and one of these light beams is made incident upon a groove formed in the optical disk and a first tracking error signal is derived from the one light beam reflected by or transmitted through the groove, and all the light beams are made incident upon a groove formed in the optical disk and a second tracking error signal is derived from all the beams reflected by or transmitted through the groove.
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