Liquid ejection head and image forming apparatus

Details Liquid ejection head and image forming apparatus Liquid ejection head and image forming apparatus

2006-02-17

2008-12-16

Meier, Stephen D (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S071000, C347S072000, C347S064000

Reexamination Certificate

active

07465039

ABSTRACT:
The liquid ejection head comprises: a plurality of ejection ports which eject liquid; a plurality of pressure chambers which are communicated with the ejection ports; a plurality of piezoelectric elements which are arranged to sides of the pressure chambers opposite sides of the pressure chambers where the ejection ports are formed, the piezoelectric elements each having driving electrodes, the piezoelectric elements each deforming the pressure chambers when drive signals are applied through the driving electrodes; a protective member which covers the piezoelectric elements and has a first wiring layer electrically connected to a first external wiring; a common liquid chamber which is arranged on the protective member on the sides of the plurality of pressure chambers opposite the sides of the pressure chambers where the ejection ports are formed, a wall of the common liquid chamber opposite the protective member having a second wiring layer electrically connected to a second external wiring, the common liquid chamber supplying the liquid to the plurality of pressure chambers; and a plurality of wiring members which are electrically connected to the second wiring layer and formed so that at least a part of each of the wiring members extends inside the common liquid chamber in a direction substantially perpendicular to a surface on which the piezoelectric elements are arranged, wherein a part of the driving electrodes of the piezoelectric elements are electrically connected to the first wiring layer, and another part of the driving electrodes of the piezoelectric elements are electrically connected to the second wiring layer through the wiring members.

REFERENCES:
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patent: 2006/0061631 (2006-03-01), Yokouchi
patent: 2006/0066677 (2006-03-01), Hori
patent: 2006/0066688 (2006-03-01), Sugimoto et al.
patent: 2006/0066689 (2006-03-01), Hori
patent: 2006/0077229 (2006-04-01), Yokouchi
patent: 2006/0176344 (2006-08-01), Mita
patent: 9-226114 (1997-09-01), None
patent: 2001-179973 (2001-07-01), None
patent: 2001-353871 (2001-12-01), None
patent: 2002-36547 (2002-02-01), None
patent: 2002-86724 (2002-03-01), None
patent: 2002-264331 (2002-09-01), None

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