G - Physics – 06 – K
Patent
G - Physics
06
K
352/51
G06K 7/015 (2006.01) G11B 7/0033 (2006.01) G11B 7/09 (2006.01)
Patent
CA 1320574
ABSTRACT A tracking device for an optical memory card according to the present invention 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 the duration of 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 to 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 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. Accordingly, skew information on an optical memory card is obtained in advance during the writing/reading of the card, and a signal approximating to a normal tracking error signal is schematically generated utilizing the skew information thus obtained for a short period of time during which a normal tracking error signal is lost or is about to be lost due to dust or a scratch existing on the card. In consequence, normal tracking state can be maintained without interrupting the writing or reading of the optical memory card, and the schematic tracking state can be returned to the original normal state after this period has passed.
596051
Kabushiki Kaisha Csk
Marks & Clerk
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