Apparatus for detecting position of light spot
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United States of America Patent
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May 18, 1993
Grant Date -
N/A
app pub date -
Jan 23, 1992
filing date -
Jan 30, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is disclosed an apparatus for detecting position of a light spot, suitable for the tracking control or the track-jumping control at the time of reproducing an optical disk. This light spot position detector has a circuit configuration featured below. Namely, three light beams are used to provide three push-pull outputs from the respective light beams to apply a predetermined operation to those push-pull outputs, thereby to generate a light spot position signal permitting discrimination as to whether or not the light spot is in the on-track state. Further, by gain controlling the light spot position signal thus generated, a suitable signal is permitted to be outputted even when a signal is undesirably attenuated for any reason.
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