Image forming apparatus having transfer voltage control
US5438399A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 18, 1994 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Jan 18, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/1675
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes a movable image bearing member; an image forming device for forming an image on the image bearing member; a charging member press-contacted to or faced to the image bearing member to transfer the image from the image bearing member onto the transfer material passed therebetween; a bias voltage applying device for applying a bias voltage to the charging member, wherein the voltage applying device constant-voltage-controlled the charging member in a period when an image region of the image bearing member is present in the transfer position, and constant-current-controls the charging member in another period, and wherein a voltage applied to the charging member during the constant voltage control is a sum of a voltage provided during the constant current control and a predetermined voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.