Developing device having dispersed floating electrodes in a dielectric layer
US4564285A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1983 |
| Grant date | Jan 14, 1986 |
| Priority date | — |
| Expiry date | May 27, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0653
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device includes a developing sleeve driven to rotate to transport a film of developer riding on its outer peripheral surface, the developing sleeve including an electrically conductive cylinder, a dielectric layer formed on the cylinder and a plurality of fine electrodes provided electrically isolated from each other at least at the outer peripheral surface of the dielectric layer. In one form, each of the fine electrodes is previously coated with an insulating material having the volume resistivity of 10.sup.12 ohms-cm or more to a thickness of 0.5 microns to 0.5 mm. An intermediate dielectric layer may be provided between the cylinder and the first dielectric layer. Further, an electrically conductive layer may be provided as sandwiched between the two dielectric layers. Moreover, the outermost surface of the sleeve may be appropriately roughened in view of the average diameter of toner particles used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.