Ink jet printhead having compensation for topographical formatio

Details Ink jet printhead having compensation for topographical formatio Ink jet printhead having compensation for topographical formatio

1992-12-28

1995-05-02

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 42, 347 43, B41J 2145, B41J 205

Patent

active

054124123

ABSTRACT:
An improved thermal ink jet printhead is formed by the alignment and bonding of an anisotropically etched silicon wafer channel plate, containing a plurality of channel grooves, to a silicon wafer heater plate, containing a plurality of heating and addressing elements which are covered by a patterned thick film layer. The printhead enables better bonding of the two plates by compensating for raised lips or edges formed on the outside edge of opposing last pits in an array of pits located in the thick film layer that are created while photofabricating the pits in the insulating layer. The fabrication sequence compensates for the raised edges by including a non-functional straddling channel that nullifies the standoff created by the raised edge and a corresponding additional non-functional pit that positions the raised edge away from the functional channels and nozzles.

REFERENCES:
patent: Re32572 (1988-01-01), Hawkins et al.
patent: 4463359 (1984-07-01), Ayata et al.
patent: 4638337 (1987-01-01), Torpey et al.
patent: 4678529 (1987-07-01), Drake et al.
patent: 4740800 (1988-04-01), Kyoshima
patent: 4774530 (1988-09-01), Hawkins
patent: 4899181 (1990-02-01), Hawkins et al.

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