Toner projection printer with means to reduce toner spreading
US5867191A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1995 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Jul 6, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/4155
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A toner projection printer is provided with a developer surface which manifests a developer bias, and includes a cloud of entrained toner particles. A platen structure is positioned opposed to the developer surface and manifests a platen voltage that is attractive to the toner particles. An address plate is positioned between the developer surface and the platen structure. The address plate includes a determined thickness insulator with through pixel apertures. Each pixel aperture has at least first and second conductors that are electrically insulated from each other by the insulator, and a screen electrode for distorting the electric field between the address plate and the platen structure in a manner to reduce toner spreading. A first drive circuit is coupled to the first conductor for controllably applying a row drive voltage which is either a reference potential that exerts a repulsive force on the toner particles or a high voltage which is attractive to the toner particles. A second drive circuit is coupled to the second conductor for controllably applying a column voltage drive that is either a reference voltage (repulsive to the toner particles) or a high voltage (attractiv…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.