Canon Kabushiki Kaisha

Tatsuya Inoue

Masahiro Ootsuka

Yasushi Takeuchi

Mitsuhiro Furukawa

Ryohei Terada

Yukari Shibuya

Shunichi Takada

Ichiro Katsuie

Shoji Naruge

An image forming apparatus includes a rotatable photosensitive member, a charging member, a developing device, a blade, a detecting portion, and a controller. The controller causes the photosensitive member to rotate through one full circumference or more on the following conditions during a predetermined operation: (i) a voltage which is a discharge start voltage or more is applied to the charging member, and (ii) an operation condition of the developing device is a first condition on which an amount of fog toner deposited from the developer carrying member on the photosensitive member is less than an amount of the fog toner in a second condition which is an operation condition of the developing device during a sheet interval before the image formation during the continuous image formation is interrupted.

Image forming apparatus

An image forming apparatus to execute an image forming operation for forming an image includes an image bearing member, a development unit, a drive unit, a controller, and a humidity detection unit to detect humidity near the development unit. The development unit contains developer and includes a conveyance member to convey the developer and a developer carrying member to carry the developer to a position where an electrostatic latent image formed on the image bearing member is developed. The controller controls the conveyance and the developer carrying member through the drive unit not to execute a mode for driving the conveyance and the developer carrying member without executing the image forming operation when the humidity detected when power of the image forming apparatus is shifted from off to on is higher than a predetermined value, and to execute the mode when the detected humidity falls below the predetermined value afterward.

Image forming apparatus that executes a mode for driving each of conveyance member and developer carrying member without executing image forming operation

A developing device includes a rotatable developer carrying member enclosing a magnetic field generating portion including a plurality of magnetic poles and configured to carry a developer; and a resinous regulating portion provided at a position opposing the developer carrying member and configured to regulate an amount of the developer carried by the developer carrying member. The regulating portion is formed of a resin material containing magnetic powder, and at least a free end portion, opposed to the developer carrying member, of the regulating portion has relative permeability of 10 or more and 60 or less.

Developing device

Growing community of inventors

Ushiku, Japan

Tatsuya Inoue