Color image forming apparatus and method
US5406313A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1993 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Jun 23, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0163
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A first negative or positive latent electrostatic image is formed on a latent image bearing body with a first writing device, and developed with a monochromatic toner. A second latent image of the type different than the first latent image is formed by a second writing device after setting the background voltage of the second image to have an absolute value larger than the first image, and then developed with one or two color toners selected from three color toners of respective multi-color developing units. A plurality of multi-color toner images may be formed in respective rotation cycles of the latent image bearing body. A monochromatic toner image may be formed in the same rotation cycle as one of the multi-color toner images. Finally, a plurality of toner images thus produced are transferred onto a recording sheet at once after polarities of the plurality of toner images have been arranged into the same polarity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.