Developing device methods of image forming and apparatus for image forming

摘要

A developing device comprises a developer container configured to contain a developer including a toner and a carrier, a developer delivering mechanism configured to deliver the developer toward an image bearing member of an image forming apparatus, and a detecting mechanism (18,88,90) characterized in that the detecting mechanism is configured to detect deterioration of the carrier and/or toner of the developer based on a predetermined characteristic of the developer.

<Paragraphs id="pa02" num="0002" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">The developing device may be used in an electrophotographic image forming method and an electrophotographic image forming device.