Developing roller, developing device, and image forming apparatus including developing device
US9122194B2 · kind B2 · utility
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7Claims
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Key dates
| Filing date | Dec 16, 2014 |
| Grant date | Sep 1, 2015 |
| Priority date | — |
| Expiry date | Dec 16, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing roller includes a roller main body disposed to face, without contact, an outer circumferential surface of an image carrier. The roller main body includes a resin coat layer that is formed on an outer circumferential surface of a base body that is made of a metal including aluminum, the resin coat layer being made of a resin material and having electric conductivity. An AC impedance Z obtained from an application of an AC voltage at a frequency in a range from 0.05 Hz to 100 Hz is equal to or higher than 100Ω, and a phase angle θ satisfies a relationship of 0 rad<θ<0.1 rad when a power factor is cos θ=Za/Z.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.