Amorphous diffusion barrier for thermal ink jet print heads

Details Amorphous diffusion barrier for thermal ink jet print heads Amorphous diffusion barrier for thermal ink jet print heads

1989-03-22

1990-10-23

Hartary, Joseph W.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346140R, B41J 205

Patent

active

049656112

ABSTRACT:
Disclosed is an improved thermal ink jet print head with an amorphous diffusion barrier that inhibits corrosion associated with ink. The head has a silicon substrate, a silicon dioxide insulating layer, a tantalum aluminum alloy (TaAl) resistive layer, and two separated gold conductive regions formed over the resistive layer. Ink is drawn into a channel bounded above by an orifice plate and below by the TaAl exposed between the two separated gold regions. The ink is superheated and expelled as fine droplets through the orifice plate. The invention minimizes corrosion by placing a thin corrosion-resistant layer of amorphous metallic alloy over the conductive layer, thereby improving durability of the print head.

REFERENCES:
patent: 4370668 (1983-01-01), Hara
patent: 4490728 (1984-12-01), Vaught
patent: 4535343 (1985-08-01), Wright
patent: 4596994 (1986-06-01), Matsuda
patent: 4809428 (1989-03-01), Aden

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