Electrophotographic image-forming process using grey toner
US5077158A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 27, 1990 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Apr 27, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G13/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In forming an image by developing an electrostatic latent image with a grey toner, a mixture of a white toner and a black toner is used as the grey toner and the ratio (D) of the black toner to the entire toner, the developing voltage (DV) and the image density (ID) are set so that the requirement represented by the following formula is satisfied: EQU ID=A.sub.2 .times.(1-e.sup.-K 2.sup.D).times.(1-e.sup.-K 3.sup.DV) wherein A.sub.2 is a number of from 0.5 to 2.5, K.sub.2 is a number of from 1 to 2, and K.sub.3 is a number of from 0.001 to 0.01. According to this process, a copy having a grey image area corresponding precisely to the image of an original is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.