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:
Nov. 21, 1989
Filed:
Sep. 02, 1988
Mitsuo Tsuzuki, Tokyo, JP;
Michihisa Suga, Tokyo, JP;
NEC Corporation, , JP;
Abstract
An on-demand type ink-jet print head requires only a small amount of energy for the droplet formation. A pressure chamber is filled with ink and a transducer or electromechanical conversion element applies a pressure on the ink pressure chamber. A fluid rectifier element (here, a check valve) is provided between the ink supply inlet and the pressure chamber so that a forwardly directed resistance is applied to ink flowing from the ink supply inlet to the pressure chamber and a reversely directed resistance is applied to ink flowing from the pressure chamber to the ink supply inlet. A fluid resistance element (here, a plate with many pinholes) is provided between the pressure chamber and the nozzle. The resistance of the fluid resistance element is greater than the forwardly directed resistance of the rectifier element.