Information recording medium and tracking error signal detection

Details Information recording medium and tracking error signal detection Information recording medium and tracking error signal detection

1998-12-07

1999-12-28

Hindi, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 369 4437, G11B 700

Patent

active

060090545

ABSTRACT:
In a magnetic recording medium to detect tracking error signals optically where an optical head and a magnetic head scan different tracks, two signals having phases different by .pi./2 are generated and added or subtracted. By changing the amplitude of the two signals with a changeable gain amplifying means, a phase of a tracking error signal is changed so that the servo operation is conducted at the middle of the amplitude of the tracking error signal to keep the magnetic head on track.

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Communication from European Patent Office and attached Search Report.

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