| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent density unevenness in a vertical scanning direction of an image due to superposition of an AC component of AC voltage on a transfer voltage of a secondary transfer nip part. <P>SOLUTION: A heating-fixing device includes: a fixing roller 154 that contacts with a toner image 131 on a recording paper; a pressure roller 125 that forms a fixing nip part N1 for carrying the recording paper together with the fixing roller 154; and a heating roller 111 that forms a heating nip part N2 together with the fixing roller 154. In the heating-fixing device, a resistance value between the fixing nip part N1 and the heating nip part N2 is equal to or greater than a value predetermined times as large as a resistance value of a combined resistance when connecting a resistance with a resistance value (R<SB POS="POST">R</SB>+R<SB POS="POST">2</SB>) from the fixing nip part N1 to a ground through the pressure roller 125 in parallel to a resistance with a sum (R<SB POS="POST">T</SB>+R<SB POS="POST">1</SB>) of: a resistance value from a core metal 141 of a transfer roller 145 for transferring the toner image 131 on an intermediate transfer body 146 to the recording paper; and a resistance value of a resistance connected between a high-voltage power supply 144 for applying voltage to the transfer roller 145 and the core metal 141. <P>COPYRIGHT: (C)2013,JPO&INPIT |
