Image forming apparatus having controller adjusting current to main charger and transfer charger
US5552861A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1994 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | Dec 2, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/1645
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus is provided with a high voltage transformer provided with one common secondary winding for supplying a high voltage power to a main charger and to a transferring charger, a resistor for sensing a shield current of the transferring charger, an error detecting amplifier for controlling a primary side of the high voltage transformer so that the sensed shield current is constant; a constant voltage device connected to a grid of the main charger for constant-voltage controlling the main charger, and a resistor inserted in a current path to the transferring charger for setting a current supplied from the high voltage transformer to the main charger to be greater than a current supplied from the high voltage transformer to the transferring charger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.