Developing apparatus capable of preventing leakage of a developer
US4963930A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Aug 9, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0898
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing apparatus using a dry developer in the form of a toner. The apparatus includes a housing having an opening which is located to face a photoconductive element. A vent is formed through the housing to release a pressure being developed in the housing, while a filter closes the vent to filter out a toner cloud. A smooth air guide plate which is more than 5 millimeters wide is provided in an edge portion of the opening downstream of a developing position with respect to an intended direction of a rotation of the photoconductive element. The air guide plate is spaced apart from the photoconductive element by a distance less than 2 millimeters and serves to increase the velocity of air flowing into the housing through the opening and, thereby, prevents toner particles from being released to the outside of the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.