US 11,754,957 B2
Image forming apparatus
Yusuke Minato, Chiba (JP); and Takenori Sueoka, Ibaraki (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 4, 2022, as Appl. No. 17/686,660.
Claims priority of application No. 2021-059836 (JP), filed on Mar. 31, 2021.
Prior Publication US 2022/0317610 A1, Oct. 6, 2022
Int. Cl. G03G 15/16 (2006.01); G03G 15/00 (2006.01); G06K 15/12 (2006.01); G06K 15/02 (2006.01)
CPC G03G 15/5041 (2013.01) [G06K 15/027 (2013.01); G06K 15/129 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an image bearing member configured to bear a toner image;
an image forming portion configured to form the toner image on said image bearing member;
a transfer member configured to transfer the toner image from said image bearing member onto a recording material;
a power source configured to apply a transfer voltage, to said transfer member, for transferring the toner image from said image bearing member onto the recording material;
an acquiring portion configured to acquire information on an image density of an image transferred on the recording material; and
a controller capable of executing an operation in an adjustment mode in which a test chart is outputted by transferring a plurality of test toner images onto the recording material under application of a plurality of different test voltages from said power source and then on the basis of densities of said test toner images transferred on the test chart, the transfer voltage set for transfer of the toner image from said image bearing member onto the recording material is adjusted,
wherein said test toner images include a first test toner image transferred onto the recording material under application of a first test voltage and a second test toner image transferred onto the recording material under application of a second test voltage different from the first test voltage, and
wherein in the operation in the adjustment mode, said controller adjusts the transfer voltage set for the transfer on the basis of first information on variation in image density acquired in different regions of said first test toner image and second information on variation in image density acquired in different regions of said second test toner image.