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:
Jan. 03, 1984
Filed:
Oct. 15, 1981
Hitachi, Ltd., Tokyo, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
An ink jet printing apparatus comprises a nozzle head including, orifices for ejecting ink particles, pressure chambers each having a piezoelectric element for applying a pressure wave to ink in the chamber and each communicating with corresponding one of the orifices and an ink chamber communicating with the pressure chambers, and electrical signal applying device for applying an electrical signal to selected one or ones of the piezoelectric elements to produce the pressure waves. The electrical signal applying device applies a main electrical signal pulse to the selected one or ones of the piezoelectric elements for inducing rises of the pressure waves and applies a sub-electrical signal pulse for suppressing the pulsations of the pressure waves a predetermined time interval after the main electrical signal.