Photocopying – Contact printing – Light boxes
Patent
1989-01-11
1991-04-30
Braun, Fred L.
Photocopying
Contact printing
Light boxes
361235, G03G 1502
Patent
active
050122827
ABSTRACT:
A brush type charging unit having a constant-current regulated power supply for supplying a constant current to a moving photosensitive medium through a conductive brush fiber contacting the moving photosensitive medium for charging the photosensitive medium uniformly such that the charged potential varies within a range smaller than 10 V when an atmospheric condition changes from 5.degree. C.-20% RH to 35.degree. C.-80% RH. The constant-current regulated power supply has a pulse removing circuit for charging the moving photosensitive medium uniformly even when a few pin-holes exist in the photosensitive medium. A fiber element has a resistance between 4.5.times.10.sup.7 ohm and 1.times.10.sup.13 ohm when the fiber element has 1 denier in size and 1 mm in length, for charging the photosensitive medium and avoiding burning of the fiber element.
REFERENCES:
patent: 4387980 (1985-06-01), Ueno et al.
patent: 4455078 (1984-06-01), Mukai et al.
patent: 4727463 (1988-02-01), Suzuki
patent: 4761709 (1988-08-01), Ewing et al.
patent: 4783716 (1988-11-01), Nagase et al.
patent: 4803593 (1989-02-01), Matsumoto et al.
patent: 4868729 (1989-09-01), Suzuki
Kimura Masatoshi
Nakajima Junzo
Wanou Masahiro
Braun Fred L.
Fujitsu Limited
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