Developing roller, with conductive elastic layer having exposed protrusions, cartridge and apparatus
US9921518B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2017 |
| Grant date | Mar 20, 2018 |
| Priority date | — |
| Expiry date | Feb 23, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G21/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
It is directed to providing a developing roller capable of forming a high-quality electrophotographic image. The developing roller includes a substrate, an electro-conductive elastic layer on the substrate, and a plurality of electrical insulating domains on the electro-conductive elastic layer. The developing roller has a length L of 200 mm or more in a longitudinal direction orthogonal to the circumferential direction thereof. The surface of the developing roller includes the surfaces of the domains and an exposed portion of the electro-conductive elastic layer, the exposed portion being uncovered with the domains. The developing roller has protrusions on the surface thereof, the protrusion being formed by the domains. The electro-conductive elastic layer has a plurality of protrusions at the exposed portion. The developing roller has an Asker C hardness of 50 degrees or more and 90 degrees or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.