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:
Mar. 01, 2005
Filed:
Oct. 11, 2000
Clayton L Holstun, San Marcos, CA (US);
Jeffrey Allen Nielsen, Corvallis, OR (US);
Matthew D Giere, San Diego, CA (US);
Scott Norum, La Jolla, CA (US);
Stephen W Bauer, San Diego, CA (US);
Mark D Lund, Vancouver, WA (US);
Robert W Sperry, Austin, TX (US);
Dustin W Blair, San Diego, CA (US);
Clayton L Holstun, San Marcos, CA (US);
Jeffrey Allen Nielsen, Corvallis, OR (US);
Matthew D Giere, San Diego, CA (US);
Scott Norum, La Jolla, CA (US);
Stephen W Bauer, San Diego, CA (US);
Mark D Lund, Vancouver, WA (US);
Robert W Sperry, Austin, TX (US);
Dustin W Blair, San Diego, CA (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A printhead for an inkjet printer having geometric features which reduce drop placement error of main and satellite drops ejected from the nozzles of the printhead. Nozzles that are tilted along an axis corresponding to the direction of scanning of the printhead while printing have reduced drop placement error in the orthogonal direction to the scanning, and create a breakoff velocity for the satellite drop that can cause the main and satellite drops to be placed in a coincident location on the medium in one of the directions of scanning, thus forming desireable round printed spots and reducing drop placement error in the scan direction. These improvements can be repeatably achieved for all nozzles. Nozzles with non-circular and asymmetric bores also reduce drop placement errors, particularly when these types of nozzles are also tilted.