Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1981-02-06
1983-06-28
Pellinen, A. D.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 1, 355 14D, G03G 1504
Patent
active
043902669
ABSTRACT:
An exposure apparatus for an electronic duplicator including a first light-receiving element for receiving light reflected by a reference reflector plate or by an original and a second light-receiving element for receiving light reflected from an image focusing point of a photosensitive medium. The doses of light received by these light-receiving elements are converted to voltage signals for comparison with a reference voltage level in a comparator. The output of the comparator is coupled through a control signal generator and a trigger pulse generator to a lamp driver for controlling the document illuminating lamp light intensity and is also coupled through the control signal generator and a transformer for controlling the bias voltage applied to a developing device.
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George Keith E.
Pellinen A. D.
Tokyo Shibaura Denki Kabushiki Kaisha
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