US 12,292,707 B2
Image forming apparatus
Koji Uno, Osaka (JP); Keisuke Oba, Osaka (JP); and Yasuhiro Michishita, Osaka (JP)
Assigned to KYOCERA Document Solutions Inc., Osaka (JP)
Filed by KYOCERA Document Solutions Inc., Osaka (JP)
Filed on May 10, 2024, as Appl. No. 18/661,185.
Claims priority of application No. 2023-082919 (JP), filed on May 19, 2023.
Prior Publication US 2024/0385553 A1, Nov. 21, 2024
Int. Cl. G03G 15/16 (2006.01); G03G 15/00 (2006.01); G03G 15/01 (2006.01)
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
OG exemplary drawing
 
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.