Liquid ejection head and ejection abnormality determination...

Details Liquid ejection head and ejection abnormality determination... Liquid ejection head and ejection abnormality determination...

2005-07-06

2009-06-02

Matthew, Luu (Department: 2861)

Incremental printing of symbolic information

Ink jet

Controller

C347S014000

Reexamination Certificate

active

07540580

ABSTRACT:
The liquid ejection apparatus comprises: an ejection head which has an ejection element, the ejection element including an ejection aperture through which a droplet of liquid is ejected onto an ejection receiving medium, a pressure chamber which is connected to the ejection aperture and accommodates the liquid to be ejected from the ejection aperture, and a pressurizing device which applies an ejection pressure to the liquid accommodated in the pressure chamber; a drive signal application device which applies to the pressurizing device a meniscus vibration drive signal for suppressing increase in viscosity of the liquid in vicinity of the ejection aperture by causing a meniscus surface of the liquid to vibrate and to eject no droplet from the ejection aperture; a pressure determination device which determines pressure in the pressure chamber when the meniscus surface is vibrated by the meniscus vibration drive signal; and a judgment device which judges an abnormal state of the ejection element from pressure information of the pressure chamber based on pressure determination information obtained by the pressure determination device.

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