Piezo-electric bimorph type transducer

Details Piezo-electric bimorph type transducer Piezo-electric bimorph type transducer

1981-04-02

1983-01-04

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

G11B 2110, G11B 2118

Patent

active

043675042

ABSTRACT:
A piezo-electric bimorph type transducer of a cantilever type for controlling the scan tracking of a magnetic tape by a rotating head in a helical-scan-type video tape recorder. In this transducer, piezo-electric thin plates which constitute a piezo-electric bimorph are formed in a different shape from the electrodes attached to the piezo-electric thin plates, and the width of the electrodes is smaller than the width of the piezo-electric thin plates in the direction from a fixed end of the transducer toward a movable end of the same, whereby in the bimorph element, a predetermined relationship is attained between the bending moment produced by a control voltage applied to the electrodes and the innertia generated in a dynamic condition, and the displacement of the magnetic head caused by the piezo-electric bimorph type transducer is in static and dynamic conformity, so that the tracking control is correctly carried out.

REFERENCES:
patent: 4093885 (1978-06-01), Brown
patent: 4099211 (1978-07-01), Hathaway
patent: 4106065 (1978-08-01), Ravizza
patent: 4151570 (1979-04-01), Ravizza et al.
patent: 4165523 (1979-08-01), Hathaway
patent: 4326228 (1982-04-01), Sakamoto

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