Piezoelectric element driving circuit

Details Piezoelectric element driving circuit Piezoelectric element driving circuit

1994-01-28

1995-02-07

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310315, 310346, H01L 4109

Patent

active

053878345

ABSTRACT:
To drive a piezoelectric element for use in a dot matrix printer for a period of time defined by .pi.LC/2, the fact that the electrostatic capacitance C of a piezoelectric element changes depending on the temperature thereof is considered. The piezoelectric element is supplied with a voltage from a D.C. power source when a switching transistor is being ON. A temperature sensor is provided which senses the temperature of the piezoelectric element. A microcomputer serving as a control circuit has a ROM in which ON durations Ton for the switching transistor are stored in relation to temperatures to be output from the temperature sensor. At the time of printing, a suitable ON duration corresponding to the sensed temperature is selected by the control circuit from the table so that the piezoelectric element is always displaced the same amount independently of the temperature of the piezoelectric element.

REFERENCES:
patent: 4866326 (1989-09-01), Niikawa et al.
patent: 5037217 (1991-08-01), Suzuki et al.
patent: 5053668 (1991-10-01), Mitsuyasu
patent: 5095256 (1992-03-01), Ueyama et al.
patent: 5190383 (1993-03-01), Suzuki et al.
patent: 5214340 (1993-05-01), Suzuki

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