Photocopying – Contact printing – Light boxes
Patent
1992-05-21
1993-08-10
Fuller, Benjamin R.
Photocopying
Contact printing
Light boxes
355259, 118653, 118661, G03G 1506
Patent
active
052353877
ABSTRACT:
On the surface of a developing roller disposed closely to a photosensitive drum, a toner supplied from a toner container to the surface is spread into a thin layer by a toner distribution and charging blade. The triboelectric charge, q.sub.1, of the toner and the triboelectric charge, q.sub.2, of the surface of the toner distribution and charging blade are equalized in polarity and made to satisfy a relation, .vertline.q.sub.2 .vertline.<.vertline.q.sub.1 .vertline.. The triboelectric charge, q.sub.3, of the surface of the developing roller is made to satisfy a relation, -4.0.ltoreq.q.sub.1 /q.sub.3 .ltoreq.-1.2. The triboelectric charge of the toner, q.sub.1, and the triboelectric charge, q.sub.4, of the surface of a recovery blade for recovering the residue of toner adhering to the developing roller are equalized in polarity and, at the same time, made to satisfy a relation, .vertline.q.sub.4 .vertline.<.vertline.q.sub.1 .vertline.. The developing apparatus constructed of the component members satisfying these conditions constantly allows easy and infallible impartation of an appropriate triboelectric charge to the toner in an operation of supplying a thin layer of the toner to an electrostatic latent image carried on the sensitive drum thereby visualizing the electrostatic latent image.
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Hosoya Masahiro
Osugi Yukihiro
Saito Mitsunaga
Sato Shuitsu
Takano Hiroki
Fuller Benjamin R.
Gibson Randy W.
Kabushiki Kaisha Toshiba
Tokyo Electric Co. Ltd.
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