Method for evaluating changes in resistance of electric resistance member and image forming apparatus using same
US7280792B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2004 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | Jul 27, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/1685
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for evaluating an electric resistance member of an image forming apparatus which can maintain good image quality, without the occurrence of transfer defects such as insufficient transfer, even in a long-term use. An intermediate transfer belt of the image forming apparatus, which is evaluated based on a fluctuation characteristic of the resistivity in a period of continuous voltage application, is used. The absolute value Δρs of the amount of changes in the surface resistivity of the intermediate transfer belt within 2 seconds to 100 seconds from the beginning of voltage application is 0.3 [Log(Ω/)] or less, when the surface resistivity ρs is measured by applying a voltage of 500 V. The absolute value Δρv of the amount of changes in the volume resistivity within 2 seconds to 100 seconds from the beginning of voltage application is 0.5 [Log(Ω·cm)] or less, when the volume resistivity ρv is measured by applying a voltage of 200 V.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.