Method for driving liquid-jet head and liquid-jet apparatus

Details Method for driving liquid-jet head and liquid-jet apparatus Method for driving liquid-jet head and liquid-jet apparatus

2006-06-06

2006-06-06

Hsieh, Shih-wen (Department: 2861)

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Reexamination Certificate

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07055921

ABSTRACT:
Disclosed is a method for driving a liquid-jet head comprising a passage-forming substrate in which pressure generating chambers communicating with nozzle orifices are formed; and a piezoelectric element provided on one surface of the passage-forming substrate via a vibration plate, and consisting of a lower electrode, a piezoelectric layer, and an upper electrode. The piezoelectric layer consists of a relaxor ferroelectric. A voltage between a potential V1, at which the capacitance of the piezoelectric element is maximal in a capacitance-potential curve of the piezoelectric element, and a potential V2, which has a larger absolute value than the absolute value of the potential V1and at which an inflection point in the capacitance-potential curve is reached, is set as a drive start potential V0. The piezoelectric element is driven using a drive waveform having an ejection step for changing the potential from the drive start potential V0to a potential V3, at which a driving electric field having an electric field strength of 100 to 500 kV/cm is generated in the piezoelectric layer, to contract the pressure generating chamber, thereby ejecting liquid droplets through the nozzle orifice.

REFERENCES:
patent: 6830302 (2004-12-01), Masumoto et al.
patent: 08-192513 (1996-07-01), None
patent: 10-250061 (1998-09-01), None
patent: 2000-326507 (2000-11-01), None
patent: 2002-234156 (2002-08-01), None

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