Actuator device, liquid ejection head, and method of...

Details Actuator device, liquid ejection head, and method of... Actuator device, liquid ejection head, and method of...

2007-04-24

2007-04-24

Huffman, Julian D. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

Reexamination Certificate

active

11381083

ABSTRACT:
A substrate is formed with a pressure generating chamber. A vibration plate is joined to the substrate so as to form a part of the pressure generating chamber. A first piezoelectric element is disposed on a part of the vibration plate facing the pressure generating chamber. The first piezoelectric element includes a first electrode disposed on the part of the vibration plate, a first piezoelectric layer laminated on the first electrode, a second electrode disposed on the first piezoelectric layer, a second piezoelectric layer laminated on the first piezoelectric layer while covering the second electrode, and a third electrode disposed on the second piezoelectric layer and electrically connected to the first electrode. A second piezoelectric element is disposed on the vibration plate, and including at least the first piezoelectric layer, the second electrode, and the second piezoelectric layer, such that an electrostatic capacity of either the first piezoelectric layer or the second piezoelectric layer is adapted to be measured. The second piezoelectric element is arranged adjacent to the first piezoelectric element in a first direction corresponding to a shorter width of the first piezoelectric element.

REFERENCES:
patent: 5886717 (1999-03-01), Satake et al.
patent: 5912526 (1999-06-01), Okawa et al.
patent: 6781290 (2004-08-01), Kurihara et al.
patent: 01-214009 (1989-08-01), None
patent: 06-008423 (1994-01-01), None
patent: 06-166178 (1994-06-01), None
patent: 07-227964 (1995-08-01), None
patent: 11-227186 (1999-08-01), None
patent: 2-289832 (2006-05-01), None

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