Image forming apparatus with constant voltage and constant current control
US5179397A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1990 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Mar 28, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/1652
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes a movable image bearing member; an image forming device for forming a toner image on the image bearing member; image transfer device for transferring the toner image from the image bearing member to a transfer material at an image transfer station, wherein the transfer device includes a charging member press-contacted or faced to the image bearing member and a device for applying a voltage to the charging member, wherein the voltage applying device applies a voltage to the charging member so that the charging member is constant-voltage-controlled when an image region of the image bearing member is in the transfer station, and the charging member is constant-current-controlled during at least a part of a period when it is not in the transfer station, wherein a voltage V2 applied during the constant voltage control is a voltage V1 appearing in the transfer device during the constant current control multiplied by a coefficient R, in which R is larger than 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.