Image-quality stabilizer for use in an electrophotographic apparatus
US5708915A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1996 |
| Grant date | Jan 13, 1998 |
| Priority date | — |
| Expiry date | Apr 24, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00054
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image-quality stabilizer in a copying machine feedback-controls a charger output according to an amount of toner on a photoreceptor drum detected by a patch sensor during a rotation of the photoreceptor drum after a copying operation. The image-quality stabilizer counts time that the copying machine is unused, i.e., time that the photoreceptor drum is stopped being rotated using a timer, and one-way controls the charger output according to the time immediately before the next copying operation. With these controlling operations, it is possible to correct a change in the copy density which is caused when the copying machine is used or left unused without increasing the consumption of toner and impairing the responsiveness of the copying machine, thereby achieving stable image quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.