Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,...
Patent
1992-04-07
1993-11-02
McCamish, Marion E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
430 30, 355246, 355282, G03G 1508
Patent
active
052582485
ABSTRACT:
An image density control method for an image forming apparatus of the type forming a latent image of a document image on a photoconductive element and developing the latent image by a toner to produce a toner image by an electrophotographic procedure. A background pattern whose density is substantially the same as the background density of a document, i.e., a light pattern is illuminated to electrostatically form a latent image thereof on the photoconductive element. The latent image is developed by the toner, and the density of the resultant toner image is optically sensed by an image density sensor. A change in background density due to contamination or an increase in background potential, for example, is detected. Based on the detected change in background density, a quantity of light for imagewise exposure or similar factor dictating the developing ability is corrected, i.e., it is controlled to the light side if the density has been shifted to the dark side. The detection of the background density and the control for correction are effected only when the charge retaining ability of the photoconductive element is stable.
REFERENCES:
patent: 4466731 (1984-08-01), Champion et al.
patent: 4801980 (1989-01-01), Arai et al.
patent: 4870460 (1989-09-01), Harada et al.
Bisaiji Takashi
Imai Chikara
Ishigaki Kouji
Koike Moriyuki
Tokuhashi Masaki
McCamish Marion E.
Ricoh & Company, Ltd.
Rosasco S.
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