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:
Oct. 08, 1985
Filed:
Jun. 30, 1982
Haruhiko Koto, Shiojiri, JP;
Epson Corporation, both of, JP;
Kabushiki Kaisha Suwa Seikosha, both of, JP;
Abstract
An ink-jet printer head comprises a piezoelectric element, a pressurization chamber coupled to the piezoelectric element for containing ink therein, and a nozzle communicating with the pressurization chamber, the piezoelectric element being deformable upon application of a drive voltage V to increase the volume of the pressurization chamber, removal of the driving signal restoring the volume and ejecting ink from the nozzle. The vibratory system including the piezoelectric element has an acoustic capacitance Co selected with respect to the flow passage system including said nozzle, said pressurization chamber and an ink supply passage, so as to minimize the drive voltage V. Drive voltage is related to the capacitance Co, electrical capacitance cp of the piezoelectric element and pressure .psi. as follows: ##EQU1## K is a constant.