In system for creating reading and writing on rotatable informat

Details In system for creating reading and writing on rotatable informat In system for creating reading and writing on rotatable informat

1998-02-13

1999-04-06

Hindi, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4423, 369 4435, 369 54, G11B 700

Patent

active

058927395

ABSTRACT:
A laser beam is split into two beams. One beam is oscillatorily varied at a first frequency in a direction associated with control of beam focus within two or more layers of a rotatable information storage medium. 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. In the embodiment herein both beams, after reflection from the medium, are returned to the laser source which is also used as a photodetector. Separate filters are used to examine the electrical output of the photodetector/source so as to simultaneously control positioning of the laser light source along the axes.

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