Voltage control apparatus for controlling a charger in an image forming apparatus
US5659839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1995 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Oct 11, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrographic copying machine has a photoreceptor drum which moves so that a photosensitive layer on its surface is successively charged, exposed, developed and charge-removed. The photosensitive layer is made of an amorphous material. The drum surface is charged by a charger before a latent image is formed thereon through exposure. A voltage generator is provided which supplies the charger with a voltage to charge the drum surface. It takes time for the potential of the charged drum surface at the developing section to reach a predetermined potential from a potential higher than the predetermined potential due to a rise characteristic of the surface potential. A controller is provided which corrects an output voltage value of the voltage generator to a voltage value necessary for the drum surface to be charged at the predetermined potential in a predetermined number of charging operations performed until the surface potential reaches the predetermined potential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.