Thermal ink jet printhead with location control of bubble collapse

A thermal ink jet printhead is disclosed having an ink channel geometry that controls the location of the bubble (42) collapse on the heating elements. The ink channels (36) provide the flow path between the printhead ink reservoir (24) and the printhead nozzles (27). In one embodiment, the heating...

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Bibliographische Detailangaben
1. Verfasser:	DESHPANDE, NARAYAN V
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CORRECTION OF TYPOGRAPHICAL ERRORS i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES PERFORMING OPERATIONS PRINTING SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A thermal ink jet printhead is disclosed having an ink channel geometry that controls the location of the bubble (42) collapse on the heating elements. The ink channels (36) provide the flow path between the printhead ink reservoir (24) and the printhead nozzles (27). In one embodiment, the heating elements are located in a pit (37) a predetermined distance upstream from the nozzle (27). 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 (42) collapse on the heating element to a location substantially in the center of the heating elements.