Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1989-05-01
1990-08-07
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
338333, B41V 205
Patent
active
049471937
ABSTRACT:
An improved thermal ink jet printhead has a plurality of heating elements in ink channels selectively addressable by electrical signals to eject ink droplets from nozzles located at one end of the ink channels on demand. The heating elements each have a passivated layer of resistive material that has non-uniform sheet resistance in a direction transverse to the direction of ink in the channels. The non-uniform sheet resistance provides a substantially uniform temperature across the width of the resistive layer, so that the power required to eject a droplet is reduced and the droplet size dependence on electrical signal energy is eliminated.
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Chittum Robert A.
Hartary Joseph W.
Xerox Corporation
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