Position detecting method, information recording/reproducing...

Details Position detecting method, information recording/reproducing... Position detecting method, information recording/reproducing...

2006-03-07

2006-03-07

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Modulating or demodulating

C360S077080, C360S078140, C360S077020, C360S077030, C360S078040, C369S043000, C369S044110, C369S044260

Reexamination Certificate

active

07009791

ABSTRACT:
A position information signal pattern is recorded into a recording medium. The position information signal pattern is configured by arranging graphics having a circular shape, a rectangular shape or the like surrounded by a certain closed curve as pattern elements on a plane, and arranging the pattern elements in circumferential and radial directions of a disc so that a phase and a head position establish a proportional relationship in two or more frequency components of a reproduced signal. Position signals of the two frequency components included in the reproduced signal from the position information signal pattern are obtained, and the two position signals are added up with a certain ratio so that a position signal without error is obtained.

REFERENCES:
patent: 4549232 (1985-10-01), Axmear et al.
patent: 6349079 (2002-02-01), Belser et al.
patent: 6754016 (2004-06-01), Messner et al.
patent: 7-105643 (1995-04-01), None
patent: 10-83640 (1998-03-01), None
patent: 10-083640 (1998-03-01), None
patent: 2001-110027 (2001-04-01), None
“Disk File Phase-Encoded Sector Servo Pattern with data and Reference Fields in Each Sector”;IBM Technical Disclosure Bulletin; vol. 29, No. 8; Jan. 1, 1987; pp. 3697-3699.

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