Electrophotographic image forming apparatus
US5581221A · kind A · utility
11Cited by
5References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1994 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Dec 13, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00042
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A copying machine wherein a developing device is provided with a first sensor for detecting the toner density in a developer and a second sensor which is provided around a photosensitive drum for detecting the amount of deposited toner on a test pattern. The toner supply is controlled according to a result detected by the second sensor. When the toner density is judged high from a result detected by the first sensor, a developing bias voltage is set high by a computer, and when the toner density is judged low, the developing bias voltage is set low.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.