Photocopying – Contact printing – Light boxes
Patent
1992-07-29
1994-07-05
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355273, 428323, 428408, 428702, 428906, G03G 1516, B32B 2700
Patent
active
053272005
ABSTRACT:
A transfer sheet-carrying member for use in a transfer-type electrophotographic image forming apparatus is characterized by having a surface sheet showing a downwardly convex current-voltage characteristic across its thickness such that when a first test current I.sub.10 is passed at an applied voltage of 10 volts, a second test current I.sub.50 is passed at an applied voltage of 50 volts and a third test current I.sub.4000 is passed at an applied voltage of 4000 volts, the current-voltage characteristic satisfies the relationships of: I.sub.50 <5.times.I.sub.10 and I.sub.50 .ltoreq.I.sub.4000 /100. The current-voltage characteristic may be regarded as downwardly convex, and the current passage is suppressed at a low voltage level. As a result, a certain amount of transfer charge is provided to the surface sheet at a single charging operation to suppress transfer irregularities.
REFERENCES:
patent: 4737816 (1988-04-01), Inoue et al.
patent: 4853736 (1989-08-01), Goto et al.
patent: 5091751 (1992-02-01), Inoue et al.
patent: 5138363 (1992-08-01), Yuge
patent: 5172173 (1992-12-01), Goto et al.
Ohtani Noriko
Sakakibara Teigo
Canon Kabushiki Kaisha
Grimley A. T.
Ramirez Nestor R.
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