The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 2009
Filed:
Jul. 06, 2005
Seiichiro Oku, Kanagawa, JP;
Seiichiro Oku, Kanagawa, JP;
Fujifilm Corporation, Tokyo, JP;
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.