Developing apparatus
US7379693B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2006 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Nov 23, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0921
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing apparatus having a rotatable developing sleeve having an elastic layer on the surface thereof for carrying a mono-component magnetic developer and urged against a photosensitive drum to develop an electrostatic image formed on the drum with the developer, a non-rotary magnet provided inside the sleeve for magnetically attracting the developer to the sleeve, and a blade having an abutting portion abutting against the sleeve in a counter direction for regulating the amount of the developer on the sleeve, a step portion spaced apart from the abutting portion, and a separating portion provided upstream of the step portion in the rotation direction of the sleeve, wherein the surface of the sleeve to which the separating portion is opposed includes a position satisfying |Br|/|B|≧0.5, where B(G): the magnitude of magnetic flux density formed on the surface of the sleeve, and Br(G): a component of the magnetic flux density in a direction perpendicular to the surface of the sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.