Photocopying – Contact printing – Light boxes
Patent
1989-03-01
1990-03-20
Prescott, A. C.
Photocopying
Contact printing
Light boxes
355203, 355208, 355261, G03G 1508
Patent
active
049105574
ABSTRACT:
An image density control method for an image forming apparatus controls any of various image forming conditions such as toner density on the basis of a result of image density detection which is executed in a pattern detection mode. A plurality of pattern detection modes are provided each for developing the latent image of a pattern having a reference voltage under a different potential for development. A development gamma characteristic representative of a characteristic relationship between the amount of toner deposited on the resulting toner image representative of the pattern and the potential for development on the basis of the results of detection which are individually associated with the plurality of pattern detection modes. The image forming condition is controlled such that the determined development gamma characteristic substantially coincides with a target development gamma characteristic.
REFERENCES:
patent: Re32330 (1987-01-01), Miyakawa et al.
patent: 4684239 (1987-08-01), Takayanagi et al.
patent: 4733276 (1988-03-01), Kakitani
patent: 4786924 (1988-11-01), Folkins
patent: 4796065 (1989-01-01), Kanbayashi
Prescott A. C.
Ricoh & Company, Ltd.
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