Magnetic recording/reproducing device having position control

Details Magnetic recording/reproducing device having position control Magnetic recording/reproducing device having position control

2006-05-16

2006-05-16

Sniezek, Andrew L. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S061000, C386S349000

Reexamination Certificate

active

07046479

ABSTRACT:
Track thinning at an IN point of consecutive recording is prevented by doing a head-track one-edge coincidence tracking by using a head of a larger width than the track width. ATF control unit (15) makes a control during reproduction of pre-roll of consecutive recording according to a pilot signal out of the reproduction output from heads (1a, 1c) so that centers of the heads (1a, 1c) may scan the center line of the track. A positioning signal (6g) during the control and a phase of HSW are detected by a detecting circuit (16), and a desired phase having a predetermined advanced amount is set by a desired phase setting unit (18) and stored in a storage unit (19). After this, a tracking method switching control unit (23) switches the tracking method into another by which a control unit (20) controls the difference in phase between the positioning signal (6g) and the HSW to a desired value stored in the storage unit (19).

REFERENCES:
patent: 5546248 (1996-08-01), Sakakibara et al.
patent: 5589992 (1996-12-01), Shibata et al.
patent: 5978171 (1999-11-01), Shimura
patent: 6704490 (2004-03-01), Shibata
patent: 8-55389 (1996-02-01), None
patent: 2000-30324 (2000-01-01), None

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