Image forming apparatus having a plurality of developers and a detection and control arrangement for detecting the density of a formed image and a controller for controlling the density of the image
US4866481A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1987 |
| Grant date | Sep 12, 1989 |
| Priority date | — |
| Expiry date | Aug 24, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/01
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus including a rotatable electrostatic latent image support member, a corona charger, an exposure device, a first developing device confronting the support member and having an effective developing width for developing an electrostatic latent image formed on the support member, a second developing device confronting the support member upstream of the first developing device in a rotational direction of the support member and having an effective developing width for developing, on the support member, not only a first area not to be developed by the first developing device but a second area for forming the electrostatic latent image, a device for forming, in the first area, a reference latent image for detecting a density of the image, a detection device for detecting a density of a reference toner image obtained by developing the reference latent image by the second developing device and a control device for controlling, on the basis of a detection signal from the detection device, the density of the image formed by the second developing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.