| 摘要 |
PURPOSE: To prevent the occurrence of the irregularity of an image due to the pin hole of a latent image carrier, to prevent the pin hole from being enlarged, and to eliminate the limitation of a brush material by specifying the drooping power characteristic of the current and the voltage of a power source in the case of electrification. CONSTITUTION: As to this brush electrifying device 1 having a brush in contact with a photoreceptor 3 and the power source 12 by which a DC voltage is applied on the brush; a specified voltage is kept in the case the drooping power characteristic of the current and the voltage of the power source 2 is <=20μA, and the drooping curve of the current and the voltage of the power source 2 passes through an area where electric power is >=45mW and <=108mW in the case the drooping power characteristic is >=20μA. When the drooping curve of the current and the voltage of the power source 12 by which the DC voltage is applied on the brush in contact with the photoreceptor 3 is in the area where the power is >=45mW and <=108mW, the pin hole exists on the photoreceptor 3, the lowering of the current and the voltage of the power source is small so as not to lower the potential of the photoreceptor 3 even though an excessive current flows between the pin hole and the brush, so that belt-like horizontal black stripe does not appear on an image. The brush is moderately melt by the current flowing between the pin hole and the brush, so that the pin hole is closed without being enlarged.
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