Thermal ink jet with half-select thermal addressing

Details Thermal ink jet with half-select thermal addressing Thermal ink jet with half-select thermal addressing

1999-02-04

1999-12-28

Barlow, John

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 205

Patent

active

060071869

ABSTRACT:
Thermal ink jet apparatus includes an ink jet pen with a plurality of ink ejection nozzles. Associated with each nozzle is a first resistor and second resistor. A feed channel introduces a quantum of ink into thermal communication with each first resistor and second resistor. The quantum of ink requires a level of applied thermal energy of E.sub.min to be caused to be ejected from the associated nozzle. An X-Y matrix drive circuit selectively applies a half-select address current to a first resistor and a half-select address current to a second resistor, both resistors located at a common nozzle. Each half-select current is insufficient to cause a resistor to emit E.sub.min thermal energy, but both half-select currents cause the first and second resistors to couple at least E.sub.min of thermal energy to the co-located quantum of ink so as to enable an ejection thereof.

REFERENCES:
patent: 4458256 (1984-07-01), Shirato et al.
patent: 5103246 (1992-04-01), Dunn

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