Aligning method for multiple ink jet color printheads with built-in optoelectronic position detector
US6508530B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2001 |
| Grant date | Jan 21, 2003 |
| Priority date | — |
| Expiry date | Sep 28, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2202/13
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The single heads (40) mounted on a single print carriage of an ink jet printer comprise a column (50) of phototransistors (51-i), built directly into the chip of each head in the same process steps as used for the circuits for selecting and driving the actuating resistors; an illuminating device (43) on board the printer focuses a light spot (70) on the column (50) of phototransistors (51-i) which, scanned in sequence, provide the electronic controller of the printer a video output (57); from the output (57), processing and computing means produce a measurement of the vertical and horizontal misalignment of each head (40), a measurement used subsequently to automatically compensate this misalignment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.