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:
Jul. 15, 2003
Filed:
Nov. 09, 2001
Applicant:
Inventors:
Yoshitaka Akiyama, Hitachinaka, JP;
Nobuhiro Noto, Hitachinaka, JP;
Yutaka Shoji, Hitachinaka, JP;
Hiroshi Takahagi, Hitachinaka, JP;
Osamu Machida, Hitachinaka, JP;
Yoshinari Suzuki, Hitachinaka, JP;
Assignee:
Hitachi Koki Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J 2/938 ; B41J 2/195 ;
U.S. Cl.
CPC ...
B41J 2/938 ; B41J 2/195 ;
Abstract
An appropriate pulse width of a driving pulse for driving a piezoelectric element of ink jet head is determined by using the head difference. That is, the pulse width with which the least change in the ink speed occurs can be used as the pulse width of the driving signal for the piezoelectric actuator. As a result, a reliable ink jet printer head capable of stably ejecting ink droplets over a long period of time and having excellent frequency characteristics can be provided.