Intermediate transfer unit, image forming apparatus including same and method for manufacturing intermediate transfer unit

A method for manufacturing an intermediate transfer unit,

• wherein the intermediate transfer unit includes:
• a seamless intermediate transfer belt on which toner images formed on a plurality of image carrying members are sequentially stacked;
• a plurality of primary transfer members that
• are respectively arranged opposite the image carrying members via the intermediate transfer belt, and
• transfer the toner images formed on the image carrying members onto the intermediate transfer belt;
• a power supply line that
• branches to at least two or more locations from a transfer voltage power supply which applies a primary transfer voltage to each of the primary transfer members to cause a primary transfer current to flow to each of the primary transfer members;
• and
• a high-voltage resistor unit that connects the power supply line and each of the primary transfer members,
• the method for manufacturing an intermediate transfer unit comprises:
• a current measurement step of measuring the primary transfer current flowing to each of the primary transfer members;
• and
• a resistor determination step of determining a resistor of the high-voltage resistor unit based on the primary transfer current measured in the current measurement step
• the current measurement step and the resistor determination step are sequentially, and
• a resistance value of the high-voltage resistor unit is adjusted by combination of a plurality of resistors connected in series and having different resistance values.