US 12,346,048 B2
Image forming apparatus
Katsuyuki Kitajima, Kanagawa (JP); Naoki Ota, Kanagawa (JP); Masataka Kuribayashi, Kanagawa (JP); Yusuke Fukuda, Kanagawa (JP); Yasuhisa Morooka, Kanagawa (JP); Tatsuhiro Igarashi, Kanagawa (JP); Teppei Yawada, Kanagawa (JP); and Shota Oshima, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on May 15, 2024, as Appl. No. 18/664,642.
Claims priority of application No. 2023-199418 (JP), filed on Nov. 24, 2023.
Prior Publication US 2025/0172895 A1, May 29, 2025
Int. Cl. G03G 15/00 (2006.01); G03G 9/087 (2006.01); G03G 15/06 (2006.01); G03G 15/09 (2006.01)
CPC G03G 15/5004 (2013.01) [G03G 9/08711 (2013.01); G03G 15/5041 (2013.01); G03G 15/065 (2013.01); G03G 15/0907 (2013.01); G03G 2215/0648 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an electrophotographic photoreceptor;
a charging device that charges a surface of the electrophotographic photoreceptor;
an electrostatic charge image-forming device that forms an electrostatic charge image on the charged surface of the electrophotographic photoreceptor;
a developing device that stores a developer containing a toner, and supplies the developer to develop the electrostatic charge image on the surface of the electrophotographic photoreceptor into a toner image, wherein the developing device has: a first developing member that is disposed to face the electrophotographic photoreceptor, holds the developer, and transports the developer to a development region; a second developing member that is disposed downstream of the first developing member in a rotation direction of the electrophotographic photoreceptor so as to face the electrophotographic photoreceptor, holds the developer, and transports the developer to a development region; a first power source that applies, to the first developing member, a developing voltage obtained by superimposing an AC voltage on a DC voltage; and a second power source that applies, to the second developing member, a developing voltage obtained by superimposing an AC voltage on a DC voltage;
a transfer device that transfers the toner image on the surface of the electrophotographic photoreceptor to a surface of a recording medium;
a fixing device that fixes the toner image to the surface of the recording medium; and
a control device that acquires image information regarding the toner image, and controls at least one of the first power source and the second power source according to the image information such that the AC voltage of the developing voltage applied to the second developing member has a lower frequency than the AC voltage of the developing voltage applied to the first developing member.