Patent ID: 6205301
Filing Date: 2001-03-20
Classification: G03G

Abstract:
A two-sided image forming apparatus comprising:(a) an image carrying member;(b) a toner image forming means for forming a toner image on the image carrying member;(c) a belt-shaped intermediate transfer body for conveying a transfer material, having a volume resistivity R (.OMEGA..multidot.cm) wherein the following expression is satisfied,10.sup.9.ltoreq.R<10.sup.12 ;(d) a primary transferring means for transferring the toner image on the image carrying member onto the intermediate transfer body or a front face of the transfer material; and(e) a secondary transferring means for transferring the toner image on the intermediate transfer body onto a rear face of the transfer material,wherein the following expressions are satisfied,0.2.ltoreq.I(1B)/V.ltoreq.0.7and0.6.times.I(1B).ltoreq.I(2).ltoreq.1.4.times.I(1B)where I(1B) (.mu.A) represents an absolute value of a primary transfer current when the toner image on the image carrying member is transferred to the front face of the transfer material by the primary transferring means, I(2) (.mu.A) represents an absolute value of a secondary transfer current when the toner image on the intermediate transfer body is transferred to the rear face of the transfer material by the secondary transferring means, and V (mm/sec) represents a moving velocity of the intermediate transfer body.