Ink printing apparatus with improved heater

Details Ink printing apparatus with improved heater Ink printing apparatus with improved heater

1996-07-22

1998-09-22

Wong, Peter S.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 17, 347 59, 347 56, 347 61, B41J 206, B41J 205

Patent

active

058121595

ABSTRACT:
A liquid ink, drop-on-demand printhead includes a substrate having a plurality of drop-emitter orifices, an ink channel coupled to each of the orifices for delivery of a body of ink to the orifices at a pressure above ambient, thereby forming an ink meniscus at the orifices. Drop selection is effected by selectively delivering heat to ink which has been delivered to selectively addressed ones of the orifices, thereby causing a difference in meniscus position between ink in addressed and non-addressed orifices. A heater is suspended in each ink meniscus close to its surface when the meniscus is at its position in a non-addressed orifice, the heater being effective to heat the meniscus and to thereby reduce surface tension of the meniscus at selectively addressed orifices.

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