System for creating, reading and writing on rotatable informatio

Details System for creating, reading and writing on rotatable informatio System for creating, reading and writing on rotatable informatio

1998-02-13

2000-03-07

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4438, 369 94, G11B 709

Patent

active

060349298

ABSTRACT:
A laser beam is split into two beams. One beam is oscillatorily at a first frequency in a direction associated with control of beam focus within two or more layers of a rotatable information storage medium, that is, in a CD-ROM-like device. The second beam is oscillatorily varied at a second (different) frequency in a direction so that it moves back and forth across an edge of a reference track. Separate filters are used to examine the reflected light so as to simultaneously control positioning of the laser light source along two axes.

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