Charging member, process cartridge and electrophotographic apparatus
US6703094B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2001 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Nov 6, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1393
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A charging member includes a conductive mandrel, a semiconductive foamed elastic layer provided on the periphery of the mandrel, and a functional double-layer film provided on the periphery of the semiconductive foamed elastic layer. The semiconductive foamed elastic layer is a layer formed by making the mandrel and a semiconductive rubber composition standing uncured and unfoamed pass through a crosshead die of an extruder to set the composition on the periphery of the mandrel, followed by curing and foaming. The semiconductive rubber composition has a Mooney viscosity of from 15 to 30 and has a curing percentage of 40% or less when the foaming pressure reaches 50%. The functional double-layer film is a double-layer tube having a thin layer such that a tube formed out of only the layer is hard to use for covering. Also disclosed are a process cartridge and an electrophotographic apparatus which have such a charging member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.