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. 17, 1984
Filed:
Nov. 25, 1981
Haruhiko Koto, Shiojiri, JP;
Epson Corporation, Nagano, JP;
Kabushiki Kaisha Suwa Seikosha, Tokyo, JP;
Abstract
An ink jet print head for projecting droplets of ink on demand includes a pressurization chamber including at least one wall defining a vibratory plate. A nozzle is open to the pressurization chamber and defines a fluid passage through which ink is ejected. A piezoelectric element is operatively coupled to the vibratory plate which is selectively energized to vibrate the wall thereby changing the volume of the pressurization chamber to eject ink through the nozzle. A vibratory system is defined by the piezoelectric element and the vibratory plate with the acoustic capacitance of the vibratory system being less than or equal to 9.times.10.sup.-17 m.sup.5 /N.