| 摘要 |
A toner supply roller of a developing device includes a shaft and a resilient member enclosing the shaft. The resilient member includes a hybrid polyurethane foam containing an ionic conductive substance and an electron conductive substance. The toner supply roller is manufactured by impregnating a semi-conductive polyurethane foam having the ionic conductive substance with a resin solution containing the electron conductive substance, drying and cutting the impregnated polyurethane foam, and inserting and adhering a shaft into the dried, cut, and impregnated polyurethane foam.
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