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

2000-07-11

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

06088309&

ABSTRACT:
A method is provided for determining, and thus controlling, vertical alignment of a laser beam used to read and/or write data from or to a rotatable information storage medium, such as a CD-ROM or CD-ROM-like disk. For a period of time, light from the laser is made to impinge on the medium from slightly different directions. The reflected light is analyzed using frequency doubling principles to determine when the light beam is most nearly perpendicular to the medium.

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