Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1990-07-02
1991-08-20
Hartary, Joseph W.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
346140R, B41J 205
Patent
active
050418440
ABSTRACT:
A thermal ink jet printhead is disclosed having an ink channel geometry that controls the location of the bubble collapse on the heating elements. The ink channels provide the flow path between the printhead ink reservoir and the printhead nozzles. In one embodiment, the heating elements are located in a pit a predetermined distance upstream from the nozzle. The channel portion upstream from the heating element has a length and a cross-sectional flow area that is adjusted relative to the channel portion downstream from the heating element, so that the upstream and downstream portions of channel have substantially equal ink flow impedances. This results in controlling the location of the bubble collapse on the heating element to a location substantially in the center of the heating elements.
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patent: 4723136 (1988-02-01), Suzumura
patent: 4774530 (1988-09-01), Hawkins
patent: 4835553 (1989-05-01), Torpey et al.
patent: 4897674 (1990-01-01), Hirasawa
Chittum Robert A.
Hartary Joseph W.
Xerox Corporation
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