Developing roller, electrophotographic process cartridge, and electrophotographic image forming apparatus
US7127200B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2004 |
| Grant date | Oct 24, 2006 |
| Priority date | — |
| Expiry date | Sep 30, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0861
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing roller is provided having an elastic layer and a surface layer superposed thereon. The surface layer is formed of a resin material containing nitrogen atoms, and contains at least two types of particles, organic-compound particles (M) and organic-compound particles (N). The particles (N) are composed of nitrogen-containing heterocyclic-compound particles. The number-average particle diameter of the particles (N) in the surface layer is smaller than the number-average particle diameter of the particles (M) in the surface layer. Where the universal hardness of the elastic layer is represented by A and the universal hardness of the developing roller is represented by B, they satisfies 0.9≦B/A≦1.8.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.