Magnetic head drive which uses independently controlled piezo-el

Details Magnetic head drive which uses independently controlled piezo-el Magnetic head drive which uses independently controlled piezo-el

1994-05-18

1996-03-19

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360106, 360109, 310317, 310331, G11B 5592

Patent

active

055007775

ABSTRACT:
In a magnetic head drive for a magnetic tape recorder of a helical scan system, a pair of first and second longitudinal bimorph elements fixed to a support member is connected to a flexible bridge member and a magnetic head is mounted to the bridge member. A pair of first and second electric sources supply electric voltages independently to electrodes of the first and second bimorph elements. The voltages applied to the bimorphs are controlled against a deviation from a record track in a magnetic tape to keep a protrusion quantity of the magnetic head constant for automatic tracking. In a magnetic tape recorder wherein the upper and lower drums of a rotating head scanner are fixed and the magnetic head is rotated along an elliptical orbit, the two bimorphs are controlled not only against a deviation from a record track in a magnetic tape but also to a rotation angle of the magnetic head in order to keep a protrusion quantity of the magnetic head constant.

REFERENCES:
patent: 4169276 (1979-09-01), Rodal
patent: 4233637 (1980-11-01), Kubota
patent: 4441128 (1984-04-01), Ohba et al.
patent: 4862029 (1989-08-01), Kasai et al.
patent: 5270890 (1993-12-01), Katou et al.
patent: 5384507 (1995-01-01), Takada et al.
patent: 5387834 (1995-02-01), Suzuki
patent: 5402279 (1995-03-01), Yanagawa et al.

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