Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1985-04-03
1987-04-21
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
118657, 355300, G03G 1508
Patent
active
046592113
ABSTRACT:
A copying apparatus capable of forming an electrostatic latent image in the form of a positive image and/or a negative image on a photosensitive member for obtaining a positive image copy by developing the electrostatic latent image, is characterized in that there are provided a first developing device for subjecting the electrostatic latent image to regular development through employment of a developing material composed of a mixture of electrically insulative toner, and carrier capable of triboelectrically charging the electrically insulative toner to a polarity opposite to that of the electrostatic latent image, and a second developing device for subjecting the electrostatic latent image to reversal development through employment of a developing material composed of a mixture of the same electrically insulative toner, and carrier capable of triboelectrically charging the electrically insulative toner to the same polarity as that of the electrostatic latent image.
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Braun Fred L.
Minolta Camera Kabushiki Kaisha
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