Self-cooling thermal ink jet printhead

Details Self-cooling thermal ink jet printhead Self-cooling thermal ink jet printhead

2003-11-17

2008-08-05

Luu, Matthew (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S061000, C347S010000, C347S017000

Reexamination Certificate

active

07407271

ABSTRACT:
There is disclosed an ink jet printhead which comprises a plurality of nozzles and one or more heater elements corresponding to each nozzle. Each heater element is configured to heat a ejectable liquid in the printhead to a temperature above its boiling point to form a gas bubble therein. The generation of the bubble causes the ejection of a drop of the ejectable liquid (such as ink) through the respective corresponding nozzle, to effect printing. Each heater element is configured such that the energy applied to it to heat the ejectable liquid to cause the ejection of a drop is less than that required to heat a volume of the ejectable liquid equal to the volume of such a drop, from an ambient temperature (being the temperature at which the ejectable liquid enters the printhead) to the temperature of such a drop when it is ejected. The printhead thus has a self-cooling function.

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