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. 27, 2001
Filed:
May. 10, 1999
James M. Brenner, Vancouver, WA (US);
Steven H. Walker, Camas, WA (US);
Allan D. Donley, Vancouver, WA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
In an inkjet printing machine, an ink drop error correction apparatus includes a position extrapolator that is responsive to conventional position encoder pulses and uses a second order polynomial equation to compensated for ink drop distortions induced at higher carriage velocities of at least 25 inches per second for generating a series of nozzle firing sub-pulses that account for different carriage velocities. A fire pulse generator responsive to the sub-pulses further adjusts the firing time of the printing machine nozzles to correct for the carriage velocity induced ink drop positional errors for both non constant and constant carriage velocity conditions.