| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing roll designed so as to prevent the effect of an insulation layer formed on the external circumferential part of a base rubber layer. SOLUTION: The base rubber layer 2 is formed along the external circumferential surface of a shaft body 1 by die molding. A large number of recesses A are formed in the external circumferential surface of the base rubber layer 2, which corresponds to the transfer surface of the die, by laser etching such that the edges of the openings of the recesses overlap and at least part of the external circumferential surface is removed. The proportion of the removed part is set to 80% or more of the area of the original external circumferential surface. The outermost layer 3 is formed along the external circumference of the base rubber layer 3. COPYRIGHT: (C)2007,JPO&INPIT |
