Device for scanning an optically readable record carrier

Details Device for scanning an optically readable record carrier Device for scanning an optically readable record carrier

1996-12-13

1998-12-01

Hindi, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369110, 369112, G11B 700

Patent

active

058448705

ABSTRACT:
A device for optically scanning an information layer by means of a focused radiation beam. Radiation reflected from the information layer is made astigmatic by an oblique plane parallel plate and subsequently detected by a detection system. An electronic circuit derives a focus error signal, representing the distance between the focal point of the radiation beam and the information plane, from the electrical detector signals by using the high-frequency components in the detector signals. The influence of stray light falling on the detection system on the focus error signal is thereby reduced.

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patent: 5610883 (1997-03-01), Yanagawa
patent: 5642340 (1997-06-01), Nomura

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