Developing unit and image forming device
US8249489B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2011 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Jul 15, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0818
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing unit includes a developing roller which rotates about a rotational axis to supply toner to a photoreceptor, and a magnetic roller which forms a magnetic brush with a two-component developing agent having carrier and the toner and thereby forms a toner layer on the developing roller, the developing roller including: a cylindrical core portion which includes an electric conductor; a first resistive layer which covers a cylindrical surface of the core portion; a second resistive layer which covers the first resistive layer, and has electric-resistivity lower than that of the first resistive layer; and a current leakage control member which prevents leakage of electric current from the core portion toward the second resistive layer through an end of the developing roller along a direction of the rotational axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.