Drive circuit for controlling a movable magnetic head

Details Drive circuit for controlling a movable magnetic head Drive circuit for controlling a movable magnetic head

1977-10-17

1979-09-25

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360107, 360109, G11B 552, G11B 2110, G11B 2118

Patent

active

041692764

ABSTRACT:
An improved drive circuitry for controlling the deflection of a bimorph comprising a pair of electrically poled piezo-ceramic elements bonded to a common substrate is disclosed which applies deflection voltage in a manner whereby the polarity is always in the poling direction of each of the elements so that depolarization of the piezo-ceramic elements does not occur. The circuitry applies a common polarity D. C. biasing voltage to both of the piezo-ceramic elements of the bimorph and also applies oppositely phased A. C. deflection signals to the respective piezo-ceramic elements.

REFERENCES:
patent: 2863076 (1958-12-01), Koren et al.
patent: 3170102 (1965-02-01), Hayes
patent: 3526726 (1970-09-01), Corbett et al.
patent: 3787616 (1974-01-01), Falk et al.
patent: 3958161 (1976-05-01), Dixon
patent: 4080636 (1978-03-01), Ravizza
patent: 4093885 (1978-06-01), Brown
patent: 4099211 (1978-07-01), Hathaway
patent: 4106065 (1978-08-01), Ravizza
1954 Joint Convention of Branches of Three Institutes of Electrical Engineers, p. 677, Electro-Striction Type Relay Using Barium Titanate Ceramics, Kiyoshi Abe, et al.
Charles Edmiston, Electronic Design 18, Sep. 1, 1974, pp. 78-82.

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