Current-controlled image transfer
US4772918A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1985 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Jul 1, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/1645
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image transfer system includes an image bearing member made of a photoconductive layer and an electrically conductive backing layer, a current detector connected between the backing layer and ground, a transfer corona unit for applying corona ions to a back side of a transfer sheet brought into contact with the exposed surface of the photoconductive layer on which a toner image is carried, a power supply for applying power to the corona unit, and a controller for controlling the power supply in response to a current level detected by the current detector. This system maintains the image transfer efficiency substantially at a constant level irrespective of the condition of transfer sheet used, and in particular to the water content of the sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.