| US 7,467,858 B2 | ||
| Back pressure control in inkjet printing | ||
| Hector J. Lebron, San Diego, Calif. (US); Clayton L. Holstun, San Marcos, Calif. (US); and Dustin W. Blair, San Diego, Calif. (US) | ||
| Assigned to Hewlett-Packard Development Company, L.P., Houston, Tex. (US) | ||
| Filed on Oct. 12, 2005, as Appl. No. 11/248,907. | ||
| Prior Publication US 2007/0081052 A1, Apr. 12, 2007 | ||
| Int. Cl. B41J 2/175 (2006.01) | ||
| U.S. Cl. 347—85 | 24 Claims |
| 1. A printing system comprising:
an ink supply;
a printhead fluidly connected to said ink supply, said printhead including a plurality of ink ejection nozzles;
a plurality of pressure chambers, each configured to maintain a different back pressure during printing operations; and
a valve between said pressure chambers and said printhead, wherein said valve selectively couples one of said pressure chambers
to said printhead to control a back pressure in said printhead based on a current print mode.
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