Device for driving piezoelectric vibrator

Details Device for driving piezoelectric vibrator Device for driving piezoelectric vibrator

1990-11-16

1992-08-04

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310316, H01L 4108

Patent

active

051361990

ABSTRACT:
A device for driving a piezoelectric vibrator is comprised of an AC power supply for supplying electric power to a piezoelectric vibrator for vibration thereof, a detecting device for detecting current supplied to the piezoelectric vibrator, and a driving circuit interposed between the AC power supply and the piezoelectric vibrator so as to decrease the electric power being supplied to the piezoelectric vibrator as the current flowing therethrough increases. This structure brings a decrease in electric power being supplied to the piezoelectric vibrator when current flowing therethrough is increased during resonance of the piezoelectric vibrator, thereby enabling the restriction or regulation of the expansion and contraction of the piezoelectric vibrator while maintaining resonance thereof.

REFERENCES:
patent: 3432691 (1969-03-01), Shoh
patent: 3989042 (1976-11-01), Mitsui et al.
patent: 4271371 (1981-06-01), Furuchi et al.
patent: 4318062 (1982-03-01), Mitsui
patent: 4632311 (1986-12-01), Nakane
patent: 4689515 (1987-08-01), Benndorf et al.
patent: 4748365 (1988-05-01), Poupaert et al.
patent: 4879528 (1989-11-01), Gotanda
patent: 5025187 (1991-06-01), Fujie et al.

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