Focus servo circuit apparatus with automatic bias adjustments

Details Focus servo circuit apparatus with automatic bias adjustments Focus servo circuit apparatus with automatic bias adjustments

1995-03-16

1995-12-12

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 54, G11B 7095

Patent

active

054756642

ABSTRACT:
In a recording and reproducing apparatus of CD or the like, it is adapted such that the time difference between an edge of a PLL clock synchronized with an EFM signal and a transition point of the EFM signal is measured in a time difference measuring circuit, a focus bias voltage to bring the time difference to a minimum is established in a bias voltage generator, the established focus bias voltage is added in an adder to a focus error signal generated in a focus error signal generator, and, thereby, the focus bias is automatically adjusted and focus servo is executed in accordance with the bias-adjusted focus error signal.

REFERENCES:
patent: 4755980 (1988-07-01), Yoshimaru et al.
patent: 5187696 (1993-02-01), Ishii et al.
patent: 5268888 (1993-12-01), Terada
patent: 5283774 (1994-02-01), Mashimo
G. Bouwhuis, J. Braat, A. Huijser, J. Pasman, G. Van Rosmalen and K. Schouhamer Immink: "Principles of Optical Disc Systems", Philips Research Laboratories, Eindhoven; Bristol, Great Britain, Adam Hilger, Ltd., 1986, pp. 58-64.

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