Pressure generating mechanism, manufacturing method thereof,...

Details Pressure generating mechanism, manufacturing method thereof,... Pressure generating mechanism, manufacturing method thereof,...

2005-12-06

2005-12-06

Shah, Manish S. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S040000, C347S072000

Reexamination Certificate

active

06971737

ABSTRACT:
An actuator unit includes piezoelectric ceramic sheets put in layers. Common and individual electrodes are disposed alternately between the piezoelectric ceramic sheets. Each portion of a piezoelectric ceramic sheet where common and individual electrodes overlap each other is a deformable active portion. Each active portion corresponds to a pressure chamber of an ink passage unit. When a drive electric field is applied selectively between common and individual electrodes in a pair, the corresponding active portion is deformed along the thickness direction of the piezoelectric ceramic sheet to change the volume of the corresponding pressure chamber. Microcrack regions provided on both sides of the deformed active portion prevent the deformation of the active portion from propagating to neighboring active portions.

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