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:
Apr. 28, 2009
Filed:
Jun. 14, 2006
Tsutomu Kusakari, Kanagawa, JP;
Tsutomu Kusakari, Kanagawa, JP;
Fujifilm Corp., Tokyo, JP;
Abstract
The liquid ejection head comprises: an ejection hole which ejects liquid; a pressure chamber which accommodates the liquid to be ejected from the ejection hole; an ejection force generating element which applies an ejection force to the liquid inside the pressure chamber; and a pressure measurement device including a capacitance-type pressure measurement element which measures pressure generated in the pressure chamber, the pressure measurement device having a resistance and a capacitance whereby frequency f and cut-off frequency fof a measurement signal obtained from the pressure measurement element in accordance with the pressure generated in the pressure chamber satisfy a relationship of f<f.