Use of a laser light source as a detector via a dithering modula

Details Use of a laser light source as a detector via a dithering modula Use of a laser light source as a detector via a dithering modula

1996-04-01

1997-11-04

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369100, G11B 700

Patent

active

056847823

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: 4358774 (1982-11-01), Wilkinson
patent: 4972397 (1990-11-01), Zurbrick et al.
patent: 5070496 (1991-12-01), Ogawa et al.
patent: 5251198 (1993-10-01), Strickler
patent: 5386409 (1995-01-01), Yokota et al.
patent: 5506826 (1996-04-01), Kobayashi
patent: 5511059 (1996-04-01), Brazas, Jr.

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