Direct printing method with improved control function
US6109730A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Mar 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2217/0025
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a direct electrostatic printing method, in which a stream of computer generated signals, defining an image information, are converted to a pattern of electrostatic fields which selectively permit or restrict the transport of charged toner particles from a particle source toward a back electrode and control the deposition of those charged toner particles in an image configuration onto an image receiving medium. Particularly, the present invention refers to a direct electrostatic printing method performed in consecutive print cycles, each of which includes at least one development period (t.sub.b) and at least one recovering period (t.sub.w) subsequent to each development period (t.sub.b), wherein the pattern of electrostatic fields is produced during at least a part of each development period (t.sub.b) to selectively permit or restrict the transport of charged toner particles from a particle source toward a back electrode, and wherein a supplemental voltage source is applied at the beginning of each development period to enhance the transport of the particle source at the beginning of each development period. Advantageously, an additional electric fi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.