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

2000-09-12

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4413, G11B 709

Patent

active

061187402

ABSTRACT:
A method for writing information on a laser writable recording blank with reference tracks utilizes a split laser beam. A first of these beams is used for writing while the second is directed to a mirror or similar device which causes the second beam to move across a track edge in an oscillatory manner. The laser light reflected in this process is converted to an electrical signal which is analyzed to determine very precisely the distance between the track edge and the point of impingement of the first beam on the disk. Power in this first beam is then controlled so as to write information on the disk. The precise control allows a plurality of information tracks to be written between adjacent reference track portions.

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