Photocopying – Contact printing – Light boxes
Patent
1993-10-08
1996-04-02
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355246, G03G 1500
Patent
active
055045570
ABSTRACT:
An electrified portion electric-potential, exposed portion electric-potential, and developing biasing electric-potential are controlled so as to obtain a constant ratio between an input level in exposure to generate the electrostatic latent image and the density associated with the toner-made image resulting from the developing for said electrostatic latent image. A target electric-potential determination table obtains therefrom respective target values for the electrified portion electric-potential, exposed portion electric-potential, and developing biasing electric-potential, wherein the target values obtained may vary depending on variation in the relevant characteristics due to ambience and/or aging of the developing system. A control-input determination unit determines control-input for controlling the electrified portion electric-potential, exposed portion electric-potential and developing biasing electric-potential so that these potentials equal their respective target values.
REFERENCES:
patent: 5101231 (1992-03-01), Saitoh
patent: 5220373 (1993-06-01), Kanaya
patent: 5225872 (1993-07-01), Fukushima
patent: 5298943 (1994-03-01), Ide et al.
Otsuka, S., Organic Photoconductor--Its Electrophotographic Properties and Basic Physical Processes, Electrophotographic Society Bulletin, vol. 27, No. 4, 1988, pp. 588-594.
Katou, M., Measurment for Toner and Developer, Electrophotographic Society Bulletin, vol. 30, No. 2, 1991, pp. 158-167.
Kimura, M., Toner-Charge Measuring Method, Electrophotographic Society Bulletin, vol. 30, No. 2, 1991, pp. 168-171.
Pendegrass Joan H.
Ricoh Co. Ltd.
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