Photocopying – Projection printing and copying cameras – With developing
Patent
1990-07-19
1992-01-14
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
With developing
250561, 355 68, G03B 2732, G03B 2752
Patent
active
050814842
ABSTRACT:
An image recording medium is provided with an identifying index indicative of whether or not one side of the image recording medium is a front side coated with developing agent. In another image recording medium coated with developing agent, electrical resistance material is coated on at least one side of the image recording medium. In a detecting device for the another image recording medium, an electrode unit is provided for measuring electric conductivity of one side of the image recording medium. A control unit is connected to the electrode unit for identifying the image recording medium on the basis of the electric conductivity measured by the electrode unit. In another detecting device, a light emitting unit emits light with which at least one of front and back sides of an image recording medium is illuminated. A light receiving unit receives light reflected from the at least one side of the image recording medium. An identifying unit is connected to the light receiving unit for identifying the front and back sides and presence and absence of the image recording medium on the basis of the light received by the light receiving unit.
REFERENCES:
patent: 4782365 (1988-11-01), Takagi
patent: 4845374 (1989-07-01), White et al.
patent: 4919531 (1990-04-01), Mashiko et al.
Higashiyama Shunichi
Kawahara Hiroshi
Kuwabara Satoru
Nakata Takashi
Ohta Mitsuru
Brother Kogyo Kabushiki Kaisha
Wintercorn Richard A.
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