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:
Jan. 13, 2009
Filed:
Sep. 29, 2005
Seiichiro Oku, Kanagawa, JP;
Seiichiro Oku, Kanagawa, JP;
Fujifilm Corporation, Tokyo, JP;
Abstract
The liquid ejection apparatus includes: ejection head which includes: a nozzle through which a droplet of liquid is ejected onto an ejection receiving medium; a pressure chamber which accommodates the liquid to be ejected from the nozzle; and a piezoelectric element which is provided at the pressure chamber and applies an ejection force to the liquid inside the pressure chamber; a pressure sensor which is provided at the pressure chamber and generates a determination signal corresponding to pressure in the pressure chamber; an integration device which integrates the determination signal obtained by the pressure sensor for a prescribed integration time period; and an ejection abnormality judgment device which judges whether or not an ejection abnormality occurs in the nozzle, according to a comparison result of comparing an integration result obtained from the integration device with a previously established threshold value.