Ink jet printer driving circuit

Details Ink jet printer driving circuit Ink jet printer driving circuit

1977-08-29

1978-11-21

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

310317, G01D 1516

Patent

active

041268679

ABSTRACT:
An electronic circuit for driving an ink jet print head of the type wherein a droplet of ink is ejected from an ink chamber through an orifice upon demand by pulsing a piezoelectric element in a manner to suddenly reduce the volume of the chamber. Switching circuits responsive to a low level control signal cooperatively energize the piezoelectric element for the duration of a control pulse and discharge the inherent capacitance of the crystal at the end of the control pulse. A storage capacitor is connected in a way to reduce the current drain on the power supply. Critical semi-conductor switching elements are provided with variable biases to maximize their switching speed.

REFERENCES:
patent: 3683212 (1972-08-01), Zoltan
patent: 3946398 (1976-03-01), Kyser
patent: 4034380 (1977-07-01), Isayama

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