04789425 is referenced by 90 patents and cites 9 patents.

A thermal ink jet printhead of the type which expels droplets on demand towards a recording medium from nozzles located above and generally parallel with the bubble generating heating elements contained therein is disclosed, together with fabrication processes therefor. The droplets are propelled along trajectories that are perpendicular to the heating element surfaces and from nozzles located in the printhead roof; such configuration is generally referred to as "roofshooter". Each printhead comprises a silicon heater plate and a fluid directing structural member. The heater plate has a linear array of heating elements associated addressing electrodes, and an elongated ink fill hole parallel with the heating element array. The structural member contains at least one recessed cavity, a plurality of nozzles, and a plurality of parallel walls within the recessed cavity which define individual ink channels for directing ink to the nozzles. The recessed cavity and fill hole are in communication with each other and form the ink reservoir within the printhead. The ink holding capacity of the fill hole is larger than that of the recessed cavity. The fill hole is precisely formed and positioned within the heater plate by anisotropic etching. The structural member may be fabricated either from two layers of photoresist, a two-stage flat nickel electroform, or a single photoresist layer and a single stage flat nickel electroform.

Title
Thermal ink jet printhead fabricating process
Application Number
7/82417
Publication Number
4789425
Application Date
August 6, 1987
Publication Date
December 6, 1988
Inventor
Raymond E Bailey
Webster
NY, US
Pamela J Hartman
Hilton
NY, US
Michael R Campanelli
Webster
NY, US
Stephen F Pond
Pittsford
NY, US
William G Hawkins
Webster
NY, US
Donald J Drake
Rochester
NY, US
Agent
Robert A Chittum
Assignee
Xerox Corporation
CT, US
IPC
G01D 15/16
B23P 15/00
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