Multiple inkjet cartridge alignment for bidirectional printing by scanning a reference pattern
US5448269A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1993 |
| Grant date | Sep 5, 1995 |
| Priority date | — |
| Expiry date | Apr 30, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J19/142
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A system for correcting for a time of flight delay of a drop of ink from an inkjet printhead. The inventive system includes a first mechanism for scanning the printhead along a first axis at a first velocity. A control circuit, responsive to inkjet timing signals, causes the printhead to eject ink onto a media to create a test pattern thereon as the printhead is scanned along the first axis. A sensor optically sense the test pattern and provides a time of flight dependent phase signal in response thereto. This signal is processed to provide time of flight delay corrected inkjet timing signals for the first velocity in response to the phase signal. In a particular implementation, the processor is adapted to add an additional delay to the corrected timing signals to correct for curvature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.