Contact charging image forming apparatus having improved image transfer
US5708929A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1996 |
| Grant date | Jan 13, 1998 |
| Priority date | — |
| Expiry date | Mar 13, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2221/0005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an image forming apparatus, when a transferred material exists in a transfer position between a photoreceptor drum and a transfer unit during an image forming operation, a transfer voltage, which has opposite polarity to that of a voltage applied to a brush charger and is used for transferring a developer image on the photoreceptor drum onto the transferred material is applied to the transfer unit. Meanwhile, when a transferred material does not exist in the transfer position during the image forming operation, a non-transfer voltage, which is lower than the transfer voltage, is applied to the transfer unit. As a result, defects on an image due to returning of a developer from the brush charger to the photoreceptor drum can be prevented from being generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.