Thermal ink jet printer and a method of driving the same

Details Thermal ink jet printer and a method of driving the same Thermal ink jet printer and a method of driving the same

1995-03-17

1998-03-31

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 205

Patent

active

057343985

ABSTRACT:
A thermal ink jet printer includes a plurality of ink channels filled with ink, and a plurality of nozzles corresponding to respective ones of the plurality of ink channels individually. Each nozzle brings the corresponding ink channel into fluid communication with an outside atmosphere. A plurality of protection-layerless heaters are provided on respective ones of the plurality of ink channels individually to face a corresponding nozzle. An LSI device with drive circuits is connected to each heater for applying a print signal to a selective one of the heaters. To drive the printer, every other heater is sequentially driven at a predetermined interval of less than 1 microsecond so that ink droplets are sequentially ejected, when the print signals are produced, from odd-numbered nozzles and thereafter from even-numbered nozzles. To this effect, each of the heaters is applied with a pulse of voltage having a duration of 3 microseconds or less so that a portion of the ink in a corresponding ink channel is rapidly vaporized to produce a bubble caused by fluctuation nucleation. Expansion of the bubble ejects the ink droplet from a corresponding nozzle. At least 20 microseconds is paused between the ejection of the ink droplets from the odd-numbered nozzles and the ejection of the ink droplets from the even-numbered nozzles.

REFERENCES:
patent: 4683481 (1987-07-01), Johnson
patent: 5142296 (1992-08-01), Lopez et al.
patent: 5537133 (1996-07-01), Marler

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