Photocopying – Contact printing – Light boxes
Patent
1993-08-05
1994-11-15
Moses, R. L.
Photocopying
Contact printing
Light boxes
355208, G03G 1501
Patent
active
053653254
ABSTRACT:
Each of a charging process on and after a second time is carried out by a charging means having a controlling electrode. The relationship between a controlling potential (Vg) applied to the controlling electrode of each charming means, the target surface potential (Vo) of a non-image portion of a surface of a photosensitive body and the direct current component potential (Vdc) of a developing bias potential in each developing process is satisfied by the formula, which is .vertline.Vo.vertline.>.vertline.Vdc.vertline..gtoreq..vertline.Vg.vertlin e.. Thereby the corona current ia supplied to flow sufficiently, it can rise the surface potential of a toner image portion of the surface of the photosensitive body after the re-charming without the excessive rise of the surface potential of the non-image portion of the photosensitive body. The surface potential of the toner image portion of the photosensitive body after the re-charging becomes to higher than the direct component potential (Vdc) of the developing bias potential, it can prevent from mixing the toners having other color.
REFERENCES:
patent: 4736223 (1988-04-01), Suzuki
patent: 4791452 (1988-12-01), Kasai et al.
patent: 4860048 (1989-08-01), Itoh et al.
patent: 5034772 (1991-07-01), Suzuki
patent: 5066979 (1991-11-01), Goto et al.
Kumasaka Takao
Miyasaka Toru
Otome Yukio
Shimazaki Yuzuru
Hitachi , Ltd.
Hitachi Koki Co,. Ltd.
Moses R. L.
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