Canon Kabushiki Kaisha

Shigeru Ohki

Kazuhisa Kemmochi

Hiroyuki Suzuki

Yuji Sakemi

Masami Izumizaki

Koji Amemiya

Kunihiko Kitayama

An image forming apparatus includes an image bearing member for bearing an electrostatic latent image; developer carrying member for carrying a developer comprising toner particles; a voltage source for applying to the developer carrying member an oscillating voltage having a predetermined frequency; wherein the following is satisfied:

Image forming apparatus having developer carrying member supplied with

A developing device for developing an electrostatic latent image includes a rotatable developer carrying member for carrying a developer composed of toner particles and magnetic carrier particles, wherein the developer carrying member rotates through a supply position where the developer is supplied to a surface of the developer carrying member, a regulating position where a regulating member for regulating a thickness of a layer of the developer on the surface is disposed, a developing position where the electrostatic latent image is developed, and a removing position for removing the developer remaining on the surface after a developing operation, in the order named. A stationary magnet is disposed in the developer carrying member. The magnet includes a developing magnetic pole for forming a magnetic field at the developing position, and a plurality of conveying magnetic poles disposed between the supply position and the regulating position, wherein a peak of magnetic flux density of each of the conveying magnetic poles is 10-49% of a peak of the magnetic flux density of the developing magnetic pole.

Developing apparatus

An image forming apparatus includes an electrophotographic photosensitive member; a light source; a developing device for developing with a developer an electrostatic latent image formed on the photosensitive member by light from the light source, wherein the developer is a one component non-magnetic developer; and a controller responsive to image information to control a continuous light emitting period of the light source per one picture element.

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Yokohama, Japan

Shigeru Ohki