Head shifting device in a recording and/or reproducing apparatus

Details Head shifting device in a recording and/or reproducing apparatus Head shifting device in a recording and/or reproducing apparatus

1993-05-12

1995-08-15

Envall, Jr., Roy N.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7801, 360 7813, 369 32, G11B 2102

Patent

active

054424976

ABSTRACT:
In a head shifting device where a head is shifted by a first prescribed amount for every n (.gtoreq.2) drive steps of a stepwise drive source, the positioning of the head is performed in such a way that before the fact that the head has overrun a prescribed position is detected, the head is shifted stepwise by the aforesaid first prescribed amount, and it is then driven by a second prescribed amount, defined by m (<n) drive steps of the stepwise drive source, so that the head is shifted back stepwise and is stopped when the fact that the aforesaid prescribed position has been reached is detected.

REFERENCES:
patent: 3646261 (1972-02-01), Kinjo et al.
patent: 3956766 (1976-05-01), Hanson et al.
patent: 3977024 (1976-08-01), Haneji et al.
patent: 4272793 (1981-06-01), Van Landingham
patent: 4313141 (1982-01-01), Yanagida et al.
patent: 4394696 (1983-07-01), Yoshimaru
patent: 4594620 (1986-06-01), Shoji et al.
patent: 4620244 (1986-10-01), Krause
patent: 4627043 (1986-12-01), Uehara
patent: 4698702 (1987-10-01), Miyake
IBM TDB vol. 19, No. 4, "Head-to-Track Synchronizing Mechanism for Magnetic Disks" Porter et al., Sep. 1976, pp. 1393-1395.

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