Method of contact-charging the surface of a photosensitive mater

Electricity: electrical systems and devices – Electric charging of objects or materials

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355219, G03G 1502

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active

054853443

ABSTRACT:
A charging method for charging a photosensitive material of, for example, the photosensitive drum of an electrophotographic copying apparatus is accomplished by bringing an endless electrically conducting flexible sheet containing a brush roller into physical contact with the surface of the photosensitive material and applying a voltage to the electrically conducting flexible sheet. The electrically conducting flexible sheet is a laminate of a first resistance layer positioned on the side of the brush roller and a second resistance layer positioned on the outer surface of the first resistance layer. The second resistance layer has an electric resistance greater than that of the first resistance layer. The method using the laminated flexible sheet makes it possible to uniformly and stably charge the surface of the photosensitive material without the life of the photosensitive material being deteriorated and without permitting the output of the power source to drop even when defects, such as pinholes, exist in the surface of the photosensitive material.

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