Photocopying – Contact printing – Light boxes
Patent
1990-06-26
1992-09-22
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355210, 361220, G03G 502, G03G 2100
Patent
active
051501570
ABSTRACT:
A conductive plate is separated from a rotary drum type photosensitive member so that the plate and the member are not in contact. A DC constant voltage which is greater than 2000 volts and less than 3000 volts is applied between the conductive plate and the rotary drum type photosensitive member is a dark chamber. As a result, an electric charge is attached uniformly on the surface of the rotary drum type photosensitive member. The rotary drum type photosensitive member, which has the uniform electric charge on the surface thereof, is exposed by a laser and developed by a development counter, and an image on the rotary drum type photosensitive member is transferred to a paper by a transfer unit. An erase lamp erases the surface potential of the rotary drum type photosensitive member.
REFERENCES:
patent: 2833930 (1958-05-01), Walkup
patent: 3272626 (1966-09-01), Shinn
patent: 3373019 (1968-03-01), Bixby
patent: 4450220 (1984-05-01), Haneda et al.
patent: 4589053 (1986-05-01), Hosono et al.
patent: 4700261 (1987-10-01), Nagase et al.
patent: 4709298 (1987-11-01), Hosono et al.
patent: 4785372 (1988-11-01), Hosono et al.
"Base and Application of Electrophotographic Technique" distributed on Jun. 15, 1988 by Corona Publishing Co., Japan.
Grimley A. T.
Hitachi , Ltd.
Smith Matthew S.
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