Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2007-12-25
2007-12-25
Nguyen, Lam Son (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S054000, C347S056000
Reexamination Certificate
active
11225054
ABSTRACT:
The present invention provides a control method for controlling an ink jet head. The inkjet head includes an ejection port substrate having ejection ports for ejection of the droplets, ejection electrodes respectively being located in a position corresponding to each of the ejection ports, and a guard electrode formed in the ejection port substrate. The control method includes the steps of: applying a drive voltage to each of the ejection electrodes in accordance with a drawing signal; and applying an AC bias voltage to the guard electrode, the AC bias voltage having the same frequency as the drive voltage applied to each of the ejection electrodes and alternately repeating a first voltage and a second voltage being lower than the first voltage.
REFERENCES:
patent: 6158844 (2000-12-01), Murakami et al.
patent: 6286938 (2001-09-01), Okano et al.
patent: 6908177 (2005-06-01), Suganuma
patent: 0 899 106 (1999-03-01), None
patent: 2000-25233 (2000-01-01), None
patent: WO 02/057086 (2002-07-01), None
Japanese Abstract No. 2001030498, dated Feb. 6, 2001.
Japanese Abstract No. 2000127408, dated May 9, 2000.
Furukawa Koji
Nakazawa Yusuke
FUJIFILM Corporation
Nguyen Lam Son
Sughrue Mion Pllc.
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