Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1984-07-17
1986-09-23
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
324452, 324457, 355 14CH, 355140, G03G 1502, G03G 1506
Patent
active
046132287
ABSTRACT:
A surface potentiometer having a movable shield member for intermittently shielding a clearance between a measurement electrode and a surface to be measured to cause a potential of the surface to be measured to be induced as an AC signal in the measurement electrode. A voltage greater than or equal to a maximum value of the potential of the surface to be measured or a voltage smaller than or equal to a minimum value of the surface potential is applied as a bias voltage to the shield member to thereby permit discrimination between positive and negative polarities of the surface potential. A rectifier is provided for rectifying the voltage induced in the electrode, and an operational device substracts the bias voltage from the rectified voltage.
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patent: 3729675 (1973-04-01), Vosteen
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patent: 3998538 (1976-12-01), Urso et al.
patent: 4063154 (1977-12-01), Andrus et al.
patent: 4100484 (1978-07-01), Buchheit
patent: 4106869 (1978-08-01), Buchheit
patent: 4127806 (1978-11-01), Shuey et al.
Kawatsura Yoshihiro
Suzuki Koji
Braun Fred L.
Canon Kabushiki Kaisha
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