Photo-detecting device

Details Photo-detecting device Photo-detecting device

1991-05-22

1992-08-04

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

051365677

ABSTRACT:
The light receiving surface of the light receiving element, which receives reflected light from an information recorded disc, is divided into sections along lines passing through the center of the surface which run parallel to and perpendicular to the direction of tracking and which also run at an angle of 45 degrees to the first two lines. The tracking errors are detected either by a push-pull method or a heterodyne method. The two methods are combined and alternately switched into operation depending on whether information is being written into or read from the information recording disc. The push-pull method uses a pair of opposing, divided light receiving surfaces disposed in the direction of tracking and the heterodyne method uses two pairs of opposing, divided surfaces disposed diagonally or at an angle of 45 degrees to the direction of tracking.

REFERENCES:
patent: 4544838 (1985-10-01), Musha et al.

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