Image forming apparatus including a developer bearing member with an alternate electric field being applied thereto
US8059995B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 2010 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Jun 17, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0634
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus including: an image bearing member; and a developer bearing member bearing a developer including a toner and a carrier, the developer bearing member developing an electrostatic image formed on the image bearing member with the developer, and the developer bearing member being applied with an alternate voltage in order to form an alternate electric field between the developer bearing member and the image bearing member, wherein assuming that electric field intensities Eb and Ed be Eb=|(Vp1−VL)/D| and Ed=|(Vp2−VL)/D|, a relationship, 0≧K1>K2, is satisfied, where K1: a gradient at Ed, and K2: a gradient at Eb, and wherein a resistivity ρb of the carrier at the electric field intensity Eb satisfies 1.1×106×en<ρb<6.0×107 [Ω·m] (where: e is the base of natural logarithms; and n=4×Eb×10−7).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.