Developing unit
US6192209A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1999 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Aug 9, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0861
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing unit of the present invention includes a case which accommodates toner containing pigment, a developing roller, a supply roller having chamfered ends and formed of an elastic member arranged to be pressed against a surface of the developing roller in such a manner as to supply toner to the surface of the developing roller. Also a first sealing member is disposed on the side ends faces of the developing roller and supply roller so as to prevent leakage to the outside portion of the case. Further, a second sealing member in the form of a film is pressed against a lower surface of the developing roller in order to prevent leakage of toner, wherein a quantity .delta. of displacement of the sealing member due to its abutment against the developing roller satisfies 0.1 mm<.delta.<0.8 mm, and the thickness t of the second sealing member satisfies 50 .mu.m<t<500 .mu.m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.