Photocopying – Contact printing – Light boxes
Patent
1993-02-26
1995-06-13
Grimley, A. T.
Photocopying
Contact printing
Light boxes
347140, 355245, G03G 1509
Patent
active
054248116
ABSTRACT:
An imagewise exposure device exposes the inner surface of a rotating photoreceptor. A developer layer is provided around the surface of a first developing roller to which a DC voltage, the polarity of which is the same as that of charge given to the insulating toner of the developer, is applied. The developer layer on the first developing roller contacts the outer surface of the photoreceptor, corresponding to the inner surface exposed, so that a toner layer is formed on the outer surface of the photoreceptor. A toner image is formed when a developer layer provided around a second developing roller contacts the outer surface of the photoreceptor on which the toner layer is formed, wherein a DC voltage having polarity reverse to that of the first developing roller is applied to the second developing roller.
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Brase Sandra L.
Grimley A. T.
Konica Corporation
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