US 11,815,836 B2
Image forming apparatus using test chart in two-sided printing
Yusuke Minato, Chiba (JP); Takenori Sueoka, Ibaraki (JP); and Tatsuya Kohno, Chiba (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 22, 2022, as Appl. No. 17/700,829.
Claims priority of application No. 2021-059834 (JP), filed on Mar. 31, 2021.
Prior Publication US 2022/0317608 A1, Oct. 6, 2022
Int. Cl. G03G 15/00 (2006.01); G03G 15/01 (2006.01); G06K 15/02 (2006.01)
CPC G03G 15/50 (2013.01) [G03G 15/01 (2013.01); G06K 15/027 (2013.01)] 5 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 having a first side and a second side;
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;
a current detecting portion configured to detect a current outputted from said power source;
an acquiring portion configured to acquire information on a density of the toner 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 (i) by transferring a plurality of first test toner images onto the first side of the recording material under application of a plurality of different test voltages by said power source and then (ii) by transferring a plurality of second test toner images onto the second side of the recording material under application of a plurality of different test voltages by said power source, and then on the basis of information on densities of the first test toner images and the second test toner images transferred on the test chart, the transfer voltage set for transfer of the toner image from said image bearing member onto each of the first side and the second side of the recording material is adjusted,
wherein in the operation in the adjustment mode, said controller (i) selects the test toner images for setting the transfer voltage for the second side of the recording material from the second test toner images, on the basis of the information on the densities of the second test toner images acquired by said acquiring portion, and then (ii) sets the transfer voltage for the second side of the recording material on the basis of the current detected by said current detecting portion when the selected test toner images are transferred onto the recording material.