Magnetic head with versatile gap

Details Magnetic head with versatile gap Magnetic head with versatile gap

1981-08-03

1983-08-09

Stellar, George G.

Dynamic magnetic information storage or retrieval

Head

Hall effect

360119, 360120, G11B 522, G11B 525, G11B 5251

Patent

active

043982298

ABSTRACT:
Apparatus squeezes together, on selective command, the poles of a core having a gap of a given physical gap length, thereby to place the poles under stress. Stress decreases the permeability of the pole material. Attendantly, in response to the application of stress, the effective gap of the core lengthens. Release of the applied stress restores the effective gap length to that corresponding to the physical gap length. To increase pole stress, the invention employs a piezoelectric element that is bonded to the core across its gap. Application of an electrical signal (of predetermined polarity) to the piezoelectric element causes the element to contract, thereby squeezing the poles together.

REFERENCES:
patent: 2822428 (1958-02-01), Wood
patent: 2928906 (1960-03-01), Gernert
patent: 3043919 (1962-07-01), Tannenbaum et al.
patent: 3480935 (1969-11-01), Springer
patent: 3546398 (1970-12-01), French
patent: 3549824 (1970-12-01), Brewster
patent: 3591729 (1971-07-01), Camras
patent: 3686467 (1972-08-01), Camras
patent: 3797032 (1974-03-01), Kelley
patent: 3855618 (1974-12-01), Koorneef et al.
patent: 3855629 (1974-12-01), Koorneef et al.
patent: 4017899 (1977-04-01), Bagby
Physical Acoustics-Principles and Methods, vol. 1-Part A, edited by Warren P. Mason, Academic Press, Inc., 1964, p. 188.

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