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

1996-07-09

1999-04-06

Hindu, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, 369 4435, 369 4441, G11B 700

Patent

active

058927417

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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patent: 5341353 (1994-08-01), Yoshino et al.
patent: 5406545 (1995-04-01), Kadowaki
patent: 5587985 (1996-12-01), Sano et al.
patent: 5633846 (1997-05-01), Okuyama et al.
Apr. 24, 1998, Communications from European Patent Office and attached Search Report.

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