| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high quality image by preventing failure in contact between bias electrodes or a leakage. SOLUTION: In the image forming device equipped with a black developing device 7, detachable from an image forming device body, which performs a specific operation by being supplied with power by the image forming device body, the electrode 32 on the image forming device body side for the power supply and the electrode 77 on the side of the black developing device 7 are slid against each other by changes in a contact area between both the electrodes during the attachment of the black developing device 7 to the image forming device body. |
