Printhead control
US9463639B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2014 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | Nov 19, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2002/063
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of printing a two-dimensional bit-mapped image having a number of pixels per row for printing using a plurality of overlapping printheads or a printhead or printheads indexed through overlapping positions, the or each printhead having a row of ejection channels, each ejection channel having associated ejection electrodes, the method comprising: applying a voltage to the ejection channels sufficient to cause concentration of particles in the printing fluid at the ejection channels, applying voltage pulses of respective predetermined amplitude and/or duration, as determined by respective image pixel bit values, to the electrodes of the selected ejection channels in order to cause volumes of printing fluid to be ejected from selected ejection channels of the overlapping printheads, thereby forming a pixel of a predetermined optical density, adjusting, for each row of the image, the values of the voltage pulses to be applied to the overlapping printheads to form pixels printed by overlapped ejection channels in dependence on the position of the pixel within an overlapped region of the printheads and in dependence on the predetermined optical density of the pixel, wherein, for …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.