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. 06, 2001
Filed:
Nov. 23, 1999
Masatoshi Araki, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In the ink jet printer, a pressure generation chamber,is expanded in a stepped manner, which enables a high speed discharge of a very small ink droplet. Prior to the ink discharge, the pressure generation chamber is contracted so as to enable a high-accuracy gradation printing with a wide range of ink droplet size. A control unit,generates: a first contraction signal for contracting the pressure generation chamber,without discharging any ink droplet,a first expansion signal for expanding the pressure generation chamber,to discharge the ink droplet,and a second expansion signal to further expand the pressure generation chamber,so as to break off an ink column discharged from a nozzle,and pull an unnecessary portion of the ink back into the nozzle