Controlling toner concentration of dry developing agent in electrophotography

摘要

A method and a device for controlling a toner concentration of a dry developing agent used in an electrophotographic apparatus wherein an electrostatic latent image is developed by a dry developing agent including toner and magnetizable carrier used to be circulated, and wherein a toner is appropriately and timely supplied to the developing agent to maintain a toner concentration within a predetermined value. The developing agent is directed to flow on an inclined member disposed on a portion of a path of circulation of the developing agent, and when a depth of the flow of the developing agent on the inclined member is reduced below a predetermined value, the toner is supplied to the developing agent.