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:
Sep. 22, 1981
Filed:
Jun. 20, 1979
Sadao Kakeno, Yokohama, JP;
Taisen Hayashi, Tokyo, JP;
Hiromichi Komai, Kawasaki, JP;
Hiroshi Yamazaki, Tokyo, JP;
Ricoh Co., Ltd., Tokyo, JP;
Abstract
In one embodiment of the present invention an ink manifold is divided into a first ink chamber communicated with an ink drop issuing nozzle and a second ink chamber communicated with an ink source and the first ink chamber through a narrow passage. First and second piezoelectric elements are mounted in opposed relationship with the first and second ink chambers, respectively. The second piezoelectric element is normally applied with such a second driving voltage that the ink will not issue through the nozzle. The frequency of a first driving voltage applied to the first piezoelectric element is twice as high as that of the second driving voltage, and the first driving voltage is selectively applied in synchronism with the second driving voltage only during the positive going half cycle thereof so that an ink drop may be issued through the nozzle during the positive going half cycle of the first driving voltage. In another embodiment of the present invention a plurality of ink drop generating cells substantially similar in construction to the ink drop generator described above are assembled to provide an ink drop generator having an array of nozzle matrix.