Ink jet printer for magnetic image character recognition printing
US5382963A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1992 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Sep 21, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K1/125
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A thermal ink jet printer for printing MICR images by liquid ink droplets. The ink contains a magnetic pigment, magnetic particles, or a combination of both. An external magnetic field in the printing zone orients the magnetic pigment in a preferred direction while the printed ink droplet is still wet, so that the magnetic pigment is mobile in a liquid medium. The printed droplet is allowed to dry under the influence of the magnetic field, thereby permanently preserving the specific orientation. As a result, the remanence of the magnetic material in the images are increased and less magnetic pigment is needed for the necessary signal for MICR. This reduction in magnetic material enables the printing by a thermal ink jet printer, because nozzle clogging is avoidable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.