Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2005-09-06
2005-09-06
Gordon, Raquel Y. (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
Reexamination Certificate
active
06938991
ABSTRACT:
A thermal actuator for a micro-electromechanical device such as an inkjet printer nozzle. The actuator has: (a) a base element; (b) a cantilevered element including a thermo-mechanical bender portion extending from the base element and a free end tip residing in a first position, the thermo-mechanical bender portion having a base end adjacent the base element and a free end adjacent the free end tip; and (c) apparatus adapted to apply a heat pulse having a spatial thermal pattern directly to the thermo-mechanical bender portion, causing the deflection of the free end tip of the cantilevered element to a second position, and wherein said spatial thermal pattern results in a substantially greater temperature increase of the base end than the free end of the thermo-mechanical bender portion. By designing the actuator such that the material with a high coefficient of thermal expansion heats with a predetermined spatial thermal pattern concentrated toward the base of the cantilever beam, the paddle end movement is greater and faster. The ink above the paddle is given the necessary pressure such that the ink in the bulging meniscus has sufficient momentum to break the surface tension and form a drop.
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Gordon Raquel Y.
Silverbrook Research PTY LTD
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