Reproducing apparatus which can play multiple types of discs and

Details Reproducing apparatus which can play multiple types of discs and Reproducing apparatus which can play multiple types of discs and

1995-01-17

1995-10-31

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 58, G11B 700

Patent

active

054636027

ABSTRACT:
An optical disc reproducing apparatus can play multiple types of discs. The apparatus biases a focusing error signal based on the disc type. An analyzer receives reflected light of a light beam irradiated from an optical pick-up to a disc. A focus error signal is generated based on the signal supplied the analyzer. A switch selectively provides one of first and second bias voltages. A control controls which of the first and second bias voltages the switch provides based on the type of disc. The bias voltage is added to the focus error signal. An object lens of the optical pickup is driven based on the focus error signal with the bias voltage added.

REFERENCES:
patent: 4512003 (1985-04-01), Kimura et al.
patent: 4707648 (1987-11-01), Minami
patent: 4769801 (1988-09-01), Funada et al.
patent: 4890274 (1989-12-01), Kaneko et al.
patent: 5003521 (1991-03-01), Yoshida et al.
patent: 5173886 (1992-12-01), Satoh et al.
patent: 5177726 (1993-01-01), Terada
patent: 5289451 (1994-02-01), Ashinuma et al.

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