Hewlett-Packard Development Company, L.p.

Valery Risson

Alejandro Manuel De Pena

Oriol Borrell Avila

David Gaston Llado

Roma Segura Fabregas

A method for reducing vertical banding of a printed image, the method performed by a control system associated with a printer, the method includes, with the control system, adjusting the spacing between which ink droplets are fired from ink nozzles of the printer as the ink nozzles move in relation to a substrate. A printing apparatus includes a platen and a carriage including a number of ink nozzles, the carriage being configured to move across a substrate placed on top of the platen; and a control system configured to adjust the spacing between which ink droplets are fired from ink nozzles of the printer as the ink nozzles move in relation to a substrate.

Reducing vertical banding

The invention relates to a method of estimating the alignment in the printing medium direction between a first and a second pen of a printing system having a scan axis, whereby: the first, respectively second pen prints a first, respectively second pattern element; the first and second pattern elements are substantially aligned and separated by a space along the scan axis; each of the first and second pattern elements comprises a first and an associated second mark separated by a blank along the scan axis, the first and the second marks being staggered in the printing medium direction; an optical sensor scans along the scan axis over the first and second pattern elements, an analysis of the sensor output leading to estimating the alignment.

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Barcelona, Spain

Valery Risson