| 摘要 |
PROBLEM TO BE SOLVED: To stabilize transfer property at a primary transfer position. SOLUTION: In this intermediate transfer unit, a toner image formed on a photoreceptor 110 is primarily transferred to an intermediate transfer belt 360 by supplying bias from a high-voltage power source to a primary transfer member 320 arranged on the back surface of the belt 360. The resistance value of the primary transfer member 320 is 10<6> to 10<8>Ω, the surface resistance value of the intermediate transfer belt is 10<8> to 10<12>Ω/square, and volume resistivity is 10<8> to 10<12>Ωcm. The high-voltage power source performs constant-current control when the impedance of the primary transfer part is large and performs constant-voltage control when the impedance is small.
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