Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-01-31
1993-09-21
Chin, Tommy P.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4414, 369 4432, G11B 700
Patent
active
052475018
ABSTRACT:
A recording and/or reproducing apparatus for from an optical disk includes a tracking error signal forming device for forming a tracking error signal by taking the difference of detection output signals from at least a pair of light beam detectors provided in an optical pickup having an actuator for shifting an objective lens in a focusing direction or in a tracking direction. Also provided is, a tracking servo device for moving the objective lens in the tracking direction on the basis of the output signal from the tracking error signal forming device to effect a tracking servo, a period detection device for detecting whether the period of a tracking servo indicating a relative movement between a track on an optical disk and a light beam from the optical disk is not more than a predetermined value, and a d.c. component switching device for switching the gain of an amplifier stage stepwise, with the amplifier stage being adapted for amplifying a detection output signal of one of at least a pair of light beam detectors and supplying the amplified signal to the tracking error signal forming device. An offset eliminating device controls the d.c. component switching device to effect switching of the gain of the amplifier stage stepwise to produce compensation data compensating the offset of the tracking error signal, only when the detection output from the period detection means indicates that the traverse signal is not more than a predetermined value, with the tracking servo means being off.
REFERENCES:
patent: 4748610 (1988-05-01), Nakata et al.
patent: 4878211 (1989-10-01), Suzuki et al.
patent: 5050151 (1991-09-01), Katz
Hashimoto Minoru
Oinoue Hiroshi
Tamura Takeo
Chevalier Robert
Chin Tommy P.
Eslinger Lewis H.
Maioli Jay H.
Sony Corporation
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