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. 30, 1993
Filed:
Apr. 03, 1992
Hiromichi Komai, Yokohama, JP;
Tomoaki Nakano, Yokohama, JP;
Toshio Inada, Sagamihara, JP;
Toshitaka Hirata, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A method of driving an ink jet type printing head is applied to a printing head which has a plurality of channels, a plurality of nozzles provided on ends of the channels and a plurality of piezoelectric elements for varying volumes of the channels in response to driving voltages so as to eject ink from each nozzle having a corresponding channel the volume of which is reduced by a corresponding one of the piezoelectric elements. The method includes the steps of applying a first driving voltage to a first group of piezoelectric elements and a second driving voltage to a second group of piezoelectric elements, and controlling a phase of at least one of the first and second driving voltages so that a predetermined phase difference exists between the first driving voltage and the second driving voltage.