Limiting propagation of thin film failures in an inkjet printhea

Details Limiting propagation of thin film failures in an inkjet printhea Limiting propagation of thin film failures in an inkjet printhea

1997-10-21

2000-03-21

Barlow, John

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 67, B41J 205

Patent

active

060394382

ABSTRACT:
A crack or delamination occurring within a thin film structure of a printhead is limited to a local region by strategically locating openings within the thin film structure. The etched openings serve to partially isolate each nozzle chamber. The openings are etched in passivation and other layers of the thin film to limit the propagation of the crack or delamination. As thermal stresses re-occur the crack or delamination extends. In may cases the crack or delamination eventually extends to the etched opening. The crack or delamination then ceases its propagation, in effect being blocked by the etched opening. By including an etched opening within the thin film near each nozzle chamber, a given nozzle chamber is isolated from a crack or delamination in the thin film at an adjacent or nearby nozzle. Reliability of a given nozzle therefore is less dependent upon the reliability of an adjacent nozzle.

REFERENCES:
patent: 4590482 (1986-05-01), Hay et al.
patent: 5124720 (1992-06-01), Schantz
patent: 5317346 (1994-05-01), Garcia
patent: 5434605 (1995-07-01), Osborne
patent: 5450109 (1995-09-01), Hock
patent: 5479197 (1995-12-01), Fujikawa et al.
patent: 5517217 (1996-05-01), Haselby et al.
patent: 5872583 (1999-02-01), Yamamoto et al.

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