Multi-color image forming apparatus having arrangements for redu

Details Multi-color image forming apparatus having arrangements for redu Multi-color image forming apparatus having arrangements for redu

1997-08-20

1999-04-13

Lee, S.

Electrophotography

Image formation

Treatment of developed image prior to transfer

399 98, G03G 1516, G03G 2100

Patent

active

058936645

ABSTRACT:
A multi-color image forming apparatus is capable of decreasing the amount of ozone generation which occurs during the formation of a multi-color image. For this purpose, a charged latent image having a tri-level electric potential is formed on a positive charging photoconductor by a charging means and an exposing means. A first color toner having one of a positive polarity and a negative polarity is caused to adhere onto one of the charged latent images having the highest electric potential level at a first developing unit of the apparatus, and a second color toner having the other polarity is caused to adhere onto the other of charged latent images having the lowest electric potential at a second developing unit of the apparatus. After that, the polarity of the toner having the negative polarity is reversed using a positive corona produced by a pre-transfer charging means to unify both polarities of the two color toners, and then both toners having the unified polarity are s transferred onto a sheet of paper.

REFERENCES:
patent: 4078929 (1978-03-01), Gundlach
patent: 4189224 (1980-02-01), Sakai
patent: 4264185 (1981-04-01), Ohta
patent: 4937629 (1990-06-01), Maruyama et al.
patent: 4937630 (1990-06-01), Yoshikawa et al.
patent: 5406313 (1995-04-01), Noami et al.
patent: 5459563 (1995-10-01), Fuma et al.

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