Developer bearing body and image forming apparatus
US7190926B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 2005 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Sep 15, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0818
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an electrophotographic image forming apparatus, a contact-type developing roller contacts a photosensitive drum, a developing blade, a supply roller or the like. If the surface of the developing roller is excessively hard, there is a possibility that a pressure applied between the developing roller and the photosensitive drum or the like may increase, and may cause a filming, i.e., a phenomena in which a toner is degraded and welded to the surface of the developing roller. The filming can be prevented when a JIS-A hardness HA (degree) of a resilient layer of the developing roller and a dynamic hardness HS (mN/μm2) of a surface layer of the developing roller satisfy the following relationship: HA×HS<15.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.