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:
Jun. 17, 2008
Filed:
Aug. 16, 2005
Chee-wah See Toh, Singapore, SG;
Fei Guo, Singapore, SG;
Ling-hwee Ong, Singapore, SG;
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A calibration method for a printing apparatus is disclosed. The printing apparatus has at least one ink pen and a carriage for scanning the ink pen across a printing region. The calibration method includes: (a) printing a test pattern across a print medium at a constant carriage velocity; (b) optically scanning the printed test pattern to obtain a sensor signal thereof; (c) setting the carriage velocity so that there are acceleration, deceleration and constant velocity printing regions; (d) printing the same test pattern; (e) optically scanning the subsequent test pattern to obtain a sensor signal thereof; (f) comparing the sensor signals of the two test patterns to determine ink dot placement errors; and (g) calibrating time-delay compensation values based on the dot placement errors.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile