Thermal ink jet printhead with rotatable heater element

Details Thermal ink jet printhead with rotatable heater element Thermal ink jet printhead with rotatable heater element

2006-09-26

2006-09-26

Patel, Vip (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S061000

Reexamination Certificate

active

07111926

ABSTRACT:
There is disclosed an ink jet printhead that has a plurality of nozzles3and a bubble forming chamber7corresponding to each nozzle respectively. At least one heater element10suspended in each bubble forming chamber7to heat a bubble forming liquid11to a temperature above its boiling point to form a gas bubble12therein. The generation of the bubble12causes the ejection of a drop16of an ejectable liquid (such as ink) through an ejection aperture5in each nozzle3, to effect printing. The heater element has a rotatable section configured such that the strain of thermal expansion is relieved by rotation of the rotatable section within the plane of the heater element. The heater elements are formed by depositing a thin strip of heater material, usually less than 1 micron thick. Repeated bending of the element can lead to oxidation and embrittlement, especially at small radius bends. This, in turn, leads to cracking and ultimately failure. Heater elements according to this invention are configured so that the thermal expansion is accommodated by the rotation of a section within the plane of lamination.

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