Printhead integrated circuit comprising thermal bend actuator

Details Printhead integrated circuit comprising thermal bend actuator Printhead integrated circuit comprising thermal bend actuator

2007-01-09

2007-01-09

Stephens, Juanita D. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S020000

Reexamination Certificate

active

11165302

ABSTRACT:
A printhead integrated circuit comprising a drive circuitry and a plurality of nozzles is provided. Each nozzle comprises a chamber for holding ink to be ejected, the chamber having an opening defined in a roof structure; and a thermal bend actuator for ejecting droplets of ink from the chamber through the opening. The bend actuator is configured as a cantilever with one end of the cantilever anchored to a base and the opposite end supporting a paddle. The actuator has a deflector section constructed of a material having a high coefficient of thermal expansion and a barrier layer constructed of a dielectric material having low thermal conductivity. A supply of current from the drive circuitry to the deflector section causes differential thermal expansion between the deflector section and the barrier layer, such that the actuator bends and the paddle ejects a droplet of ink from the nozzle.

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