Photocopying – Contact printing – Light boxes
Patent
1992-06-30
1994-02-15
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355274, 355277, 361225, G03G 1500, G03G 1516
Patent
active
052871460
ABSTRACT:
A contact type charging device having a contact member for making contact with the surface of a charge bearing member so as to apply an electric charge to the surface in an image forming apparatus of the electrophotographic type, and having a charging device which has a high resistance resistor connected serially to the contact member so as to apply a voltage to the contact member. The contact type charging device has a regulating member for regulating the upper limit of the absolute value of the voltage applied to the contact member to prevent excessive current flow to the contact member, or has a regulating member for regulating the lower limit of the absolute value of the voltage applied to the contact member to prevent a greater than necessary drop of the voltage applied to the charge bearing member.
REFERENCES:
patent: 3879120 (1975-04-01), Kurokawa et al.
patent: 3924943 (1975-12-01), Fletcher
patent: 4383752 (1983-05-01), Kisler
patent: 4466732 (1984-08-01), Folkins
patent: 4565438 (1986-01-01), Folkins
patent: 4631470 (1986-12-01), Bingley
patent: 4977430 (1990-12-01), Florack et al.
patent: 5084740 (1992-01-01), Simizu
Oka Tateki
Saito Hitoshi
Tanaka Yasuo
Uno Koji
Beatty Robert
Grimley A. T.
Minolta Camera Kabushiki Kaisha
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