Photocopying – Contact printing – Light boxes
Patent
1991-03-25
1992-11-17
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355 69, 355214, 355219, G03G 1502, G03G 1504, G03G 2100
Patent
active
051647710
ABSTRACT:
An image forming apparatus includes a detector for measuring the surface potential of a photosensitive member on which an electrostatic latent image is formed and a controller which regulates image formation plural times in accordance with the measured surface potential based on the length of time between image formations. In another aspect, the image forming apparatus includes a light source and a setting device for manually setting the quantity of light therefrom between a maximum and minimum value. A test sample of a predetermined optical density is arranged to be illuminated by the light source so as to produce a test light for projection onto a recording medium. A detector detects an electrical surface condition of the test-lighted recording medium. In response to the detected electrical surface conditions, and a controller regulates the image formation in accordance with the detector. The light from the light source is adjusted so that illumination of the test sample assumes a standard value intermediate the maximum and minimum values, and so that illumination of an original assumes the value set by the setting device.
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Iwasaki Shinichi
Kawatsura Yoshihiro
Suzuki Koji
Takahashi Shinkichi
Tsuchiya Hiroaki
Braun Fred L.
Canon Kabushiki Kaisha
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