Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

1989-05-11

1992-02-11

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 4411, G11B 7095

Patent

active

050880780

ABSTRACT:
An optical pickup apparatus in which a laser beam reflected from an optical memory medium is separated and incident to a light-receiving element having a plurality of divided light-receiving faces and a focusing error signal is formed on the basis of a difference signal provided by a predetermined combination of light-receiving signals outputted from the respective light-receiving faces of the light-receiving element, comprises a bias signal forming device for forming a bias signal in accordance with a reflectance ratio of the optical memory medium based on a sum of the light-receiving signals outputted from the respective light-receiving faces of the light-receiving element; and a device for superimposing the bias signal on the focusing error signal in an accessing stand-by state with respect to the optical memory medium.

REFERENCES:
patent: 4617654 (1986-10-01), Gross et al.
patent: 4755980 (1988-07-01), Yoshimaru et al.

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