Developing device and image forming apparatus using the same
US8045896B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 2010 |
| Grant date | Oct 25, 2011 |
| Priority date | — |
| Expiry date | May 27, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0879
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device includes a developing vessel for storing a developer, a first conveying passage, a second conveying passage, a first conveying member and a second conveying member to supply toner to a photoreceptor drum. The first conveying member includes a first rotary shaft and a first multi-helically structured blade. The first multi-helically structured blade includes a first inner helical blade and ring-shaped first outer helical blade. The first inner helical blade is formed so that the radius of the helical blade varies cyclically. The second helical pitch of the first outer helical blade is smaller than the first helical pitch of the first inner helical blade. The first outer helical blade inscribes the outer periphery of the first inner helical blade at its minimum radius portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.