CPC G03G 15/162 (2013.01) [G03G 15/0189 (2013.01); G03G 15/1605 (2013.01); G03G 15/1645 (2013.01); G03G 15/5054 (2013.01); G03G 2215/0609 (2013.01); G03G 2215/1614 (2013.01)] | 3 Claims |
1. An image forming apparatus comprising:
a plurality of image carriers each of which has a surface on which an amorphous silicon photosensitive layer is formed;
a charging device that charges the surface of the image carrier;
an exposure device that exposes the surface of the image carrier charged by the charging device, so as to form an electrostatic latent image on the surface of the image carrier;
a development device that develops the electrostatic latent image formed on the surface of the image carrier into a toner image, using developer containing toner;
an intermediate transfer belt onto which the toner images formed on the image carriers are primarily transferred sequentially;
a plurality of primary transfer rollers each of which is pressed to contact the image carrier via the intermediate transfer belt; and
a secondary transfer roller that secondarily transfers the toner images, which have been primarily transferred onto the intermediate transfer belt, to the recording medium, wherein
the intermediate transfer belt is a plastic belt having a surface resistivity of 9.5 to 10.5 log Ω/square,
an offset amount of the primary transfer roller from the image carrier is 0 to 2 mm,
a contact surface pressure between the image carrier and the intermediate transfer belt is 0.5 to 1.5 gf/mm2, and
a charge density of primary transfer current that flows when the primary transfer voltage is applied to the primary transfer roller is 0.016 to 0.040 μC/cm2.
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