Electrophotographic apparatus and method for inhibiting charge over-transfer
US5697015A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1996 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | May 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/1614
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Method and apparatus are provided for inhibiting toner transfer defects, and in particular, to inhibit over-transfer of electrical charge through a transfer medium to a toner after development of a latent image on a photoconductor in an electrophotographic imaging device. Toner transfer defects are inhibited near the leading edge of a print medium by a method which includes the step of providing a controlled ramped voltage output to a transfer member so as to provide a controlled flow of charge from the transfer member to the transfer medium during an initial application of electrical charge to a first region of the transfer medium adjacent a leading edge of the transfer medium. To inhibit intra-page toner transfer defects, the method of the invention includes the step of selectively activating a light source when the transfer medium is present in the nip region so as to partially discharge a portion of the photoconductor not containing a developed image when a servo voltage is below a servo threshold voltage during an image transfer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.