Photocopying – Contact printing – Light boxes
Patent
1988-04-08
1990-10-09
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355219, 355246, G03G 2100
Patent
active
049624075
ABSTRACT:
An electrophotographic copying apparatus includes a photosensitive member, a sensitizing charger, a developing unit for developing the electrostatic latent image by a developer incorporating toner and carrier, and a system for compensating toner concentration and charging potential of the photosensitive member surface. The system forms two reference toner images on the photosensitive member surface under different conditions so as to cause the two reference toner images to have different densities and optically measures the densities of the two reference toner images. Toner concentration in the developer can be detected based on the two reference toner image densities. When the toner concentration is less than a specified value, toner is supplied to the developer. Further, the charging potential of the photosensitive member surface is determined based on the toner concentration and the density of the reference toner image formed under the normal image formation condition, and may be corrected in accordance with the determined potential.
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Braun Fred L.
Minolta Camera Kabushiki Kaisha
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