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:
May. 15, 2001
Filed:
Apr. 13, 1998
Masaharu Ito, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya, JP;
Abstract
In an ink-jet printing apparatus, a first drive pulse is applied to an actuator of a printing head and then a second drive pulse is applied to the same actuator of the printing head. The second drive pulse has a magnitude equal to that of the first drive pulse and a pulse width equal to approximately 0.20 to 0.40 times the one-way propagation time T of pressure wave in an ink channel and the second drive pulse is terminated within a range of approximately 2.60 to 2.80 times the one-way propagation time T from an end time of the first drive pulse. This control suppresses effectively the residual pressure wave vibration thereby to reduce variations in the ink ejection speed even when the actuator driving frequency changes.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile