Drive unit for liquid ejection head

Details Drive unit for liquid ejection head Drive unit for liquid ejection head

2005-02-01

2005-02-01

Meier, Stephen D. (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S011000, C347S068000

Reexamination Certificate

active

06848763

ABSTRACT:
A drive unit for a liquid ejection head in which shrinkage of a pressure chamber and ejection of the liquid are caused by the application of a voltage to a piezoelectric body, wherein: (A) a drive pulse with an electric field exceeding the coercive electric field of the piezoelectric body is applied to the piezoelectric body during the liquid ejection operation such as printing, and (B) a pulse that eliminates polarization remaining in the piezoelectric body is applied to the piezoelectric body when no liquid ejection operation is conducted. As a result, a difference between the elements can be prevented even as time elapses, and a stable ejection characteristic can be obtained.

REFERENCES:
patent: 4577201 (1986-03-01), Murakami et al.
patent: 4988909 (1991-01-01), Hagimura et al.
patent: 5202703 (1993-04-01), Hosington et al.
patent: 5466985 (1995-11-01), Suzuki
patent: 5790156 (1998-08-01), Mutton et al.
patent: 5923352 (1999-07-01), Kikuchi et al.
patent: 6140750 (2000-10-01), Ueyama
patent: 6286923 (2001-09-01), Sugahara
patent: 09-141866 (1997-06-01), None
patent: 09-226106 (1997-09-01), None
patent: 10-024570 (1998-01-01), None
English Language Abstract of Japanese Publication No. 09-141866, published Jun. 1997.
English Language Abstract of Japanese Publication No. 09-226106, published Sep. 1997.
English Language Abstract of Japanese Publication No. 10-024570, published Jan. 1998.

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