Inkjet head for inkjet printing apparatus

Details Inkjet head for inkjet printing apparatus Inkjet head for inkjet printing apparatus

2005-01-11

2005-01-11

Brooke, Michael S. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

Reexamination Certificate

active

06840602

ABSTRACT:
An inkjet head has a plurality of pressure chambers. An end of each pressure chamber is connected to a discharging nozzle and the other end to an ink supplier. The pressure chamber has a rhombic shape having longer and shorter diagonals. The inkjet head further includes an actuator unit, which has at least one planar piezoelectric layer covering over the plurality of pressure chambers, a common electrode provided on one side surface of one of the at least one planar piezoelectric layer, and a plurality of driving electrodes provided for the pressure chambers, respectively. The plurality of driving electrodes are formed on the other side of the one of the at least one planar piezoelectric layer. Further, conditions: 0.1 mm≦L and 0.29≦δ/λ≦1 are satisfied, where L represents the length of the shorter diagonal and δ represents a length of a driving electrode extending in parallel with the width L.

REFERENCES:
patent: 4578686 (1986-03-01), Vollert
patent: 5402159 (1995-03-01), Takahashi et al.
patent: 5856837 (1999-01-01), Kitahara et al.
patent: 5933167 (1999-08-01), Shimada et al.
patent: 6488355 (2002-12-01), Nakamura et al.
patent: 0 698 490 (1996-02-01), None
patent: 1 138 493 (2001-10-01), None
patent: A 4-341852 (1992-11-01), None

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