Ink jet head incorporating a thick unpassivated TaAl resistor

Details Ink jet head incorporating a thick unpassivated TaAl resistor Ink jet head incorporating a thick unpassivated TaAl resistor

1989-02-28

1990-06-05

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

338333, B41J 205

Patent

active

049318136

ABSTRACT:
A thermal ink jet head incorporates bubble-generating resistors, each with a relatively thick layer of unpassivated resistive material, such as TaAl. The thermal ink jet head includes an ink source, ink channels, respective orifices, and circuitry for providing the electrical energy which the resistors convert to heat to form bubbles which expel ink through respective orifices. A range between 3,000 .ANG. and 5,000 .ANG. is preferred for the resistive material to minimize failure rate while avoiding thermal, electrical and manufacturing limitations of passivated resistors.

REFERENCES:
patent: 4296421 (1981-10-01), Hara
patent: 4313124 (1982-01-01), Hara
patent: 4336548 (1982-06-01), Matsumoto
patent: 4490728 (1984-12-01), Vaught
patent: 4490731 (1984-12-01), Vaught
patent: 4535343 (1985-08-01), Wright
patent: 4590482 (1986-05-01), Hay
patent: 4631555 (1986-12-01), Ikeda
patent: 4716423 (1987-12-01), Chan

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