H - Electricity – 05 – K
Patent
H - Electricity
05
K
356/7, 101/96.02
H05K 3/10 (2006.01) B41J 2/14 (2006.01) B41J 2/16 (2006.01)
Patent
CA 1277774
Abstract The specification describes a new and improved thermal ink jet printhead and fabrication process therefor wherein the heater resistors are formed on one area of an insulating substrate and relative large area electrical contacts are formed on an adjacent area of the insulating substrate. A barrier layer is formed over the conductive trace pattern defining the heater resistors on the one area, and a small via in this layer provides an electrical path between the large area electrical contacts and the conduc- tive track pattern, and thus provides a current drive path for the heater resistors. The small via provides minimum exposure of the barrier sidewall area and area of the con- ductive trace pattern and thus improve device reliability and fabrication yields and also improves electrical contact to the printhead Alternatively, the barrier layer may be made less than laterally coextensive with the conductive trace mater- ial to thereby leave a small area of the trace material available for metal overlay connection to the large area contact pad which is formed to the side of the conductive trace material.
543170
Hewlett-Packard Company
Sim & Mcburney
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