Developing device and image forming apparatus
US8874008B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 2011 |
| Grant date | Oct 28, 2014 |
| Priority date | — |
| Expiry date | Jul 10, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0844
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Developing device supplying developer to developing roller, while causing developer to circulate in passage including first and second conveying passages in parallel, and while ejecting part of developer to outside via ejection passage formed as extension of first conveying passage on downstream side in developer conveying direction, developing roller being provided along first conveying passage. Developing device includes: first communication path provided as branch of first conveying passage on downstream side, allowing first passage to communicate with second passage; first conveying part conveying developer in first passage toward first communication path; and entrance allowance unit allowing developer to enter ejection passage from first passage depending on pressure of developer in first passage, first conveying part including main and sub-conveying parts, main conveying part being provided in region corresponding to roller, sub-conveying part, provided downstream of main conveying part, conveying smaller amount of developer per unit time than main conveying part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.