Patent ID: 7003238

Claim:
An intermediate image transfer type of image forming apparatus comprising: an image carrier; an intermediate image transfer body; primary image transferring means for transferring a toner image formed on said image carrier to one surface of said intermediate image transfer body; and secondary image transferring means for transferring the toner image from said intermediate image transfer body to a recording medium; wherein said primary image transferring means comprises primary bias applying means for applying a primary image transfer bias to the other surface of said intermediate image transfer body opposite to the one surface, and wherein when a surface resistivity of said intermediate image transfer body is measured by a method that repeatedly applies a voltage v 1 of 200 V for a period of time t 1 of 60 seconds to said intermediate image transfer body and grounds said intermediate image transfer body for a period of time t 2 of 10 seconds a number of times N 1 of 1,000, a difference in absolute value between a logarithm of a first time of measurement and logarithm of a thousandth time of measurement is 0.5 log Ω/□ or below.