Optical pickup for an optical disc

Details Optical pickup for an optical disc Optical pickup for an optical disc

1994-09-13

1995-12-05

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 369112, G11B 713

Patent

active

054735866

ABSTRACT:
An optical pickup is adapted to be operated in accordance with a tracking error signal obtained by a push-pull method. The pickup has a photodetector including a pair of detector elements disposed side by side. An astigmatizer is disposed on an axis of a light beam reflected from an optical disc for producing an astigmatic beam. The photodetector is positioned outside a point where a spot of the astigmatic beam becomes a circular shape, and a boundary line between the two detector elements is disposed on a line along which the spot moves in a tracking operation.

REFERENCES:
patent: 5084850 (1992-01-01), Yanagawa et al.
patent: 5113386 (1992-05-01), Whitehead et al.

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