Driver circuit for piezoelectric actuator, and impact dot-matrix

Details Driver circuit for piezoelectric actuator, and impact dot-matrix Driver circuit for piezoelectric actuator, and impact dot-matrix

1988-02-17

1989-09-12

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310316, 310317, H01L 4108

Patent

active

048663263

ABSTRACT:
An impact dot-matrix printer having a print head which includes a piezoelectric element and a print element such as a print wire activated by the piezoelectric element, wherein the print head is movable between a printing area and a non-printing area of the printer. A pressure detector is provided for detecting a printing pressure of the print element. The detector includes a pressure-sensitive element which is disposed in a predetermined position in the non-printing area, in which the print element is operable to act on the pressure-sensitive element. A voltage controller connected to the pressure detector and the piezoelectric element is provided for controlling a voltage applied to the piezoelectric element, based on an output of the pressure detector, such that the printing pressure coincides with a predetermined value. Since the printing pressure is varied with a temperature of the piezoelectric element, the voltage may be controlled based on the temperature of the piezoelectric element detected by a temperature sensor.

REFERENCES:
patent: 3297889 (1967-01-01), Breskend
patent: 4275402 (1981-06-01), Kern
patent: 4352114 (1982-09-01), Kyogoku
patent: 4400705 (1983-08-01), Horike
patent: 4567766 (1986-02-01), Seiferling
patent: 4583059 (1986-04-01), Konno
patent: 4595854 (1986-06-01), Yano et al.
patent: 4608506 (1986-08-01), Tanuma
patent: 4660057 (1987-04-01), Watanabe et al.

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