Developing device and image forming apparatus
US8731443B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 2012 |
| Grant date | May 20, 2014 |
| Priority date | — |
| Expiry date | Aug 30, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0827
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device has a first and a second developer conveyance path configured to convey and circulate the two-component developer; a first and a second conveyance member each having a helical blade for conveying the developer in one direction; a first communicating path for guiding the developer in the first developer conveyance path to the second developer conveyance path; a second communicating path. The second developer conveyance path includes a second upstream side end section having a bottom in a conical shape having an inner diameter conically increasing. The helical blade of the second conveyance member has a second conical helix portion having an outer diameter conically increasing along an inner wall surface of the bottom of the second upstream side end section. The bottom of the second upstream side end section is at a level lower than a bottom of the first developer conveyance path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.