Focus servo system having object lens protection circuit for an

Details Focus servo system having object lens protection circuit for an Focus servo system having object lens protection circuit for an

1983-03-10

1985-09-10

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, 250201, G11B 700

Patent

active

045410844

ABSTRACT:
A focus servo system for an optical video disc player. A pair of signals generated by two pairs of photo-cells are supplied to an adder and a differential amplifier, an output signal of the adder is supplied to a first comparator and an output signal of the differential amplifier is supplied to a second comparator. When an output signal of the adder reaches a reference voltage of the first comparator, a focus servo pull-in range is detected. Thereafter, when an output signal of the differential amplifier reaches a reference voltage of the second comparator, a stable operation condition of the focus servo system is detected and a servo system loop is closed so that a malfunction is prevented.

REFERENCES:
patent: 3932700 (1976-01-01), Snopko
patent: 3974327 (1976-08-01), Van Dijk
patent: 4128847 (1978-12-01), Roullet et al.
patent: 4286147 (1981-08-01), Tsuboi et al.
patent: 4337532 (1982-06-01), Oprandi et al.
patent: 4426690 (1984-01-01), Motoyama

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