Magnetic brush apparatus for developing electrostatic images
US4638759A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1985 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Jun 17, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0921
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnetic brush apparatus for use in electrographic copiers and the like for applying magnetic developer to electrostatic images at a development zone to effect development of such images. Such apparatus includes a non-magnetic sleeve having a rotatably driven magnetic roller therein, and magnetic shunt means for selectively reducing the magnetic field produced by the magnetic roller outside the sleeve. By reducing the magnetic field shortly after the developer first contacts the image and maintaining the reduced field until the developed image is advanced beyond the influence of the magnetic roller, a trailing edge development artifact is avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.