Image transfer method for an image forming apparatus
US5599645A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1995 |
| Grant date | Feb 4, 1997 |
| Priority date | — |
| Expiry date | May 11, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0131
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an image forming apparatus of the type sequentially forming powder images of different colors on an image carrier, and sequentially transferring them to an acceptor one above the other (primary transfer), an image transfer method is disclosed which prevents transfer dust from being transferred to the acceptor at the time of the primary transfer. During the primary transfer, a bias potential V.sub.1 is applied to one of two conductors located at an upstream side. The potential V.sub.1 has the same polarity as the charged powder carried on the image carrier. A potential V.sub.2 is applied to the other conductor at a downstream side and provided with a polarity opposite to the polarity of the charged powder. Every time the primary transfer is repeated, the potentials V.sub.l and V.sub.2 are respectively sequentially shifted toward the polarity of the powder and toward the polarity opposite to the polarity of the powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.