Printhead nozzle arrangement with dual mode thermal actuator

Details Printhead nozzle arrangement with dual mode thermal actuator Printhead nozzle arrangement with dual mode thermal actuator

2011-05-31

2011-05-31

Nguyen, Lamson D (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S013000

Reexamination Certificate

active

07950771

ABSTRACT:
A pagewidth inkjet printhead assembly has a plurality of nozzle arrangements. Each nozzle arrangement comprises walls defining an ink chamber having an ink supply channel and an ink ejection port having an ink spreading prevention rim; a thermal actuator mechanism for ejecting ink from the chamber via the ejection port, the thermal actuator mechanism including an actuator arm having two layers which are formed from a conductive, resiliently flexible material, said layers surrounding a central material layer so that said two layers are in thermal balance with the arm in a quiescent state; and drive circuitry for supplying the thermal actuator mechanism with a drive current, the drive circuitry being operable in a first and second operative mode. Tn the first operative mode, the drive circuitry supplies current to the thermal actuator mechanism sufficient to cause the thermal actuator mechanism to bend to a degree whereby ink is expelled from the ink ejection port. In the second operative mode, the drive circuitry supplies current to the thermal actuator mechanism insufficient to cause ink the thermal actuator mechanism to bend to such degree whereby ink is expelled from the ink ejection port.

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