Printer with microelectromechanical printhead having...

Details Printer with microelectromechanical printhead having... Printer with microelectromechanical printhead having...

2005-11-01

2005-11-01

Stephens, Juanita D. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C060S528000

Reexamination Certificate

active

06959983

ABSTRACT:
A printer includes a microelectromechanical printhead incorporating a plurality of ink ejection nozzles. Each of the ink ejection nozzles includes an ink well to contain printing fluid and an electrically operated thermal ink ejection actuator assembly. The ink ejection actuator includes a pair of substantially parallel opposed activation members that extend from a substrate and define a gap therebetween. An actuator arm extends from the distal end of the paired activation members. In use an electrical driving circuit causes differential thermal expansion of the activation members that results in the free end of the actuator arm pivoting into the ink well in order to cause ink ejection. In order to maintain a relatively constant heating temperature along the length of the activation members, heat sinks are located in the gap and extend between the paired members. The heat sinks also act to provide increased strength and functional integrity.

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