Developing device having first and second toner supply means with an electric field generated therebetween
US5324884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1992 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Nov 24, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0808
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device includes a storage portion for storing toner, a developing roller facing and supplying the toner to an image carrier, and a rotatable supply roller for supplying the toner in the storage portion to the developing roller. A thin layer of the toner supplied from the supply roller is formed on the circumferential surface of the developing roller by a blade. Different bias potentials are individually applied to the supply roller and the developing roller by means of first and second power source so that the bias potential of the supply roller is higher than that of the developing roller with respect to the polarity of the toner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.