Tracking device for optical memory card
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United States of America Patent
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-
Jul 7, 1992
Grant Date -
N/A
app pub date -
Oct 13, 1989
filing date -
Dec 28, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Tracking device for an optical memory card includes an inclination information sampling unit for calculating changes per unit time of the low-frequency component of a tracking error signal, a detection unit for outputting a detection signal for duration of a deviation occurring during tracking that exceeds a predetermined standard range, a cumulative addition unit for cumulatively adding the output of the inclination information sampling unit of the low-frequency component of the tracking error signal that is generated when the detection signal is generated at each unit time during the generation of the detection signal, and a switch-over unit for outputting as an optical system tracking control signal the tracking error signal during the normal operation and the output of the cumulative addition unit during the outputting of the detection signal.
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