Photocopying – Contact printing – Light boxes
Patent
1991-09-24
1993-08-17
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355208, 355209, 430120, G03G 1516
Patent
active
052373711
ABSTRACT:
An electrophotographic printing apparatus includes a developing device which uses developer including toner and carrier particles. The quantity of electrical charges on the developer is measured and the developer is charged to a constant charge level in accordance with the result of the measurement. Accordingly, the developing density can be stabilized and the service life of the developer can be lengthened and predicted. A computer provides automatic processing to control the quantity of electric charges on the developer.
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R. M. Schaffert, "Electrophotography", The Focal Press Theory On Development Of Zerography Image, Kyoritu Publishing, Section 5, pp. 329-347.
Beatty Robert
Grimley A. T.
Hitachi , Ltd.
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