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摘要

PROBLEM TO BE SOLVED: To provide a toner supply roller not causing a lateral white stripe image defect.;SOLUTION: The toner supply roller 10 has cells 3 each having an aperture opening toward the outer surface with an average diameter of 300-1,000 μm. The outer circumferential surface of the elastic layer is covered with a pipe having an outer diameter the same as that of the elastic layer with both ends closed. Assuming that the supply air pressure necessary for feeding air of a 5 l/m flow rate through a conduit from a hole 25 with an open area of a 1.2 mm² formed at a point on the circumference at the central position in the longitudinal direction of the pipe to a notch portion 26 of a 15 mm width notched for an angle of a half-circumference to the circumferential direction position just opposite to the hole 25 is defined as the roller ventilation resistance, the roller ventilation resistance is 10 kPa or more.;COPYRIGHT: (C)2009,JPO&INPIT