Driver circuit for piezoelectric actuator, and dot-matrix head a

Details Driver circuit for piezoelectric actuator, and dot-matrix head a Driver circuit for piezoelectric actuator, and dot-matrix head a

1989-10-26

1992-09-15

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

4001573, B41J 295

Patent

active

051471418

ABSTRACT:
A driver circuit for driving a piezoelectric element, including a charging circuit having a DC power source and a coil for charging the piezoelectric element, and a discharging circuit for discharging the piezoelectric element. When the piezoelectric element is charged, a first switching device in the charging circuit is held on until a voltage of the element reaches a predetermined level below a line voltage of the power source. A second switching device provided in the discharging circuit is turned on at the time when the first switching device is turned off or at a predetermined later time, and is turned off by the time when said first switching device is again turned on next activation of the piezoelectric element. A voltage limiter inhibits the voltage of the piezoelectric element element from exceeding the predetermined level. The driver circuit may be used for a dot-matrix printer, which may be adapted to discharge the piezoelectric element for a comparatively long time where a distance between adjacent two dots to be formed is larger than a predetermined value.

REFERENCES:
patent: 4262592 (1981-04-01), Araki
patent: 4348119 (1982-09-01), Carson, Jr. et al.
patent: 4595854 (1986-06-01), Yano et al.
patent: 4850724 (1989-07-01), Fattori
IBM Technical Disclosure Bulletin, vol. 27, No. 12, May 1985, "Electronic Print Hammer Damping".

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