Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1998-08-20
2000-01-11
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
399 49, G03G 13045
Patent
active
060134038
ABSTRACT:
When the uniformly charged surface of a photoreceptor is exposed to an intensive light (a), a potential at an exposed position (Vx) is lower than a bias voltage (Vbias-A) of a first developing unit (b), toner A attaches to the exposed position (Vx) after its developing process, and its potential is lower than a bias voltage (Vbias-B) of a second developing unit (c). When the uniformly charged surface of a photoreceptor is exposed to a weak light, a potential at the exposed position (Vx) is lower than the bias voltage (Vbias-B) but higher than the bias voltage (Vbias-A) (e). Only toner B attaches to the photoreceptor (f). If the toner A and toner B belong to the same color family and are black toner and gray toner, an image of two density levels is formed, and the gradation and the graininess of the resultant picture are improved.
REFERENCES:
patent: 5305057 (1994-04-01), Hattori et al.
patent: 5372906 (1994-12-01), Haneda et al.
Fuji 'Xerox Co., Ltd.
Goodrow John
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