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:
Apr. 09, 2002
Filed:
Nov. 24, 1998
Paul D. Gast, Camas, WA (US);
James L. McCullough, San Diego, CA (US);
Albert Serra, Barcelona, ES;
Xavier Gros, Barcelona, ES;
Jose J Doval, Escondido, CA (US);
Stefano Schiaffino, Menlo Park, CA (US);
Ronald A. Askeland, San Diego, CA (US);
Clayton L. Holstun, San Marcos, CA (US);
Scott Norum, La Jolla, CA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A misalignment compensation technique for a dot printer is disclosed. This technique first supplies printing instructions to a printhead for energizing printing elements in various groups (primitives) to print a pattern on a medium. The printed pattern is then detected by optical sensors in the printer. Based on the detection, a position offset error for each primitive is determined. These errors are used to generate a separate time correction for each of the primitives such that, when the printer is used normally, the time period for printing a dot will be advanced or delayed for each primitive so as to align the dots printed by the primitives. In another embodiment, alignment data taken by a manufacturing line sensor is stored in a memory on the print cartridge. After the print cartridge is installed in the printer, a second optical test completes the data needed to create timing correction values.