Patent · US Expired

Method of forming dichromatic copy images

US4539281A · kind A · utility

11Cited by

11References

6Claims

0Family size

Assignee

Minolta Camera Kabushiki Kaisha · JP

Inventors

Susumu Tanaka · Tokyo, JP
Kaoru Takebe · Toyokawa, JP

Key dates

Filing date	Nov 30, 1983
Grant date	Sep 3, 1985
Priority date	—
Expiry date	Nov 30, 2003

Classification

Technology area (CPC G)Physics
CPC primaryG03G2215/0609
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The invention disclosed concerns a method of forming dichromatic copy images. An electrostatic latent image having a first image portion and a second image portion is formed. The first image portion is developed by a first magnetic brush developing device using at least a magnetic toner of first color triboelectrically chargeable to a specific polarity. The second image portion is developed by a second magnetic brush developing device using a mixture of a magnetic carrier substantially not triboelectrically chargeable with the magnetic toner and a non-magnetic toner of a second color triboelectrically chargeable to a polarity opposite to that of the magnetic toner by contact with the magnetic carrier.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.