Electric circuit for providing a position indicator signal in a

Details Electric circuit for providing a position indicator signal in a Electric circuit for providing a position indicator signal in a

1996-04-01

1998-05-26

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4411, G11B 700

Patent

active

057577439

ABSTRACT:
Laser light is focused in an accurate manner on selected layers in a multilayer optical disk recording system by means of an analysis of output electrical signals from a dithered source which results in the production of an electrical signal which is proportional to an amount by which the parts of the system are to be relatively moved in order to achieve the desired focus on one of the layers.

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patent: 4271334 (1981-06-01), Yardy
patent: 4301445 (1981-11-01), Robinson
patent: 4358774 (1982-11-01), Wilkinson
patent: 4397010 (1983-08-01), Nabeshima
patent: 4972397 (1990-11-01), Zurbrick et al.
patent: 5251198 (1993-10-01), Strickler

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