Image forming apparatus having means for measuring the amount of developing agent on the image carrier
US5270784A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1992 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | Aug 29, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00042
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes a measuring for measuring an amount of a toner agent deposited on the image carrier. The measuring device has measuring section facing the image carrier, and a conductive cover plate arranged between the measuring section and the image carrier. The cover plate is applied with a voltage whose polarity is equal to the polarity of the toner so that an electric field is generated between the image carrier and the cover plate. The electric field prevents the toner, dispersed from the image carrier, from reaching the measuring section. The toner may also be kept from adhering to the elements of the measuring section by placing a transparent plate between the image carrier and the measuring device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.