Electrographic printing device
US5278588A · kind A · utility
30Cited by
14References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 17, 1991 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | May 17, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/415
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An electrographic printhead is operated to focus charged particles on a print member. In one embodiment successive electrodes are maintained at potentials that define increasing electric field strengths in the successive regions along the particle trajectory. In another embodiment, a thick electrode face defines equipotential lines that shape a sharply focusing electrostatic field that penetrates the projection apertures of the printhead. Improved focusing diminishes charge spreading effects, and allows effective positioning of the printhead at greater spacings to reduce the risk of arcing without loss of print resolution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.