Canon Kabushiki Kaisha

Kaito Sunamura

Shuji Saito

An image forming apparatus includes an image bearing member, an intermediary transfer member having ion conductivity and a rotatable endless belt shape, a primary transfer member, a secondary transfer member, a cleaning member, an environment sensor and a controller. Based on a result of the environment sensor, the controller controls so as to change a current balance based on an integrated value of a first current value and an integrated value of a second current value. The first current value is a current flowing from inside of the intermediary transfer member to outside thereof and the second current value is a current flowing from outside of the intermediary transfer member to inside thereof.

Image forming apparatus controlling current balance based on environmental conditions

An image forming apparatus includes a photosensitive drum, a developing member, an applying device forming a developing potential on the developing member, a driver rotationally driving the developing member, and a controller. The controller selectively executes an operation in first and second modes by controlling a circumferential speed ratio of a circumferential speed of the developing member to a circumferential speed of the drum and a potential difference between a surface potential of the image bearing member in a region where an electrostatic latent image is formed and the developing potential. In the first mode, the ratio is a first ratio of 50% to 100% and the potential difference is a first potential difference, and in the second mode the ratio is a second ratio larger than the first ratio and less than 150% and the potential difference is a second potential difference less than the first potential difference.

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Kanagawa, Japan

Kaito Sunamura