Photocopying – Contact printing – Light boxes
Patent
1993-06-24
1995-04-11
Hoyer, William J.
Photocopying
Contact printing
Light boxes
355219, 361225, G03G 1500
Patent
active
054063531
ABSTRACT:
An electrophotographic printer is disclosed with the printer having a cylindrical, electrostatic latent image-bearing member, a non-corona-discharge electric charging device, an electrostatic latent image former, a developer, a device for transferring the developed image onto a recording medium, a cleaner for cleaning the surface of the latent image-bearing member, and a fixing device located downstream of the latent image bearing member for heat fixing a developed image onto the recording medium. The charging device is provided by a permanently magnetized charging roll and magnetic powder having an intrinsic volume resistance of 10.sup.2 -10 .OMEGA..cm. The magnetic powder is attracted onto the charging roll forming a magnetic brush without an externally applied bias voltage on the surface of the charging roll.
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patent: 4833547 (1989-05-01), Mase
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patent: 4959688 (1990-09-01), Koitabashi
patent: 5051784 (1991-09-01), Yamamoto et al.
patent: 5064739 (1991-11-01), Asanae et al.
Hitachi Metals Ltd.
Hoyer William J.
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