Photocopying – Contact printing – Light boxes
Patent
1992-08-26
1994-01-11
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355211, 355219, G03G 2100
Patent
active
052786129
ABSTRACT:
An image forming apparatus has a charging roller disposed in contact with a photoconductor having a photoconducting layer for charging the surface of the photoconductor, and a photoconductor life judging device including an element for detecting the change of the value of the current flowing through the charging roller and an element for judging the photoconductor life on the basis of the change of the current value.
REFERENCES:
patent: 5012282 (1991-04-01), Wanou et al.
patent: 5132738 (1992-07-01), Nakamura et al.
patent: 5160967 (1992-11-01), Tonegawa
Braun Fred L.
Conlin David G.
Corless Peter F.
Neuner George W.
Sharp Kabushiki Kaisha
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