Developing apparatus with a DC electric field formed between a developer carrying member and a developer regulating member and image forming apparatus using the same

摘要

A developing apparatus includes a developer carrying member carrying thereon a developer having a magnetic substance. The developer carried on the developer carrying member contacts an image holding member in a developing portion. A regulating member abuts against the developer carried on the developer carrying member and regulates the layer thickness of the developer carried on the developer carrying member. A DC electric field forming unit forms a DC electric field between the developer carrying member and the regulating member. The intensity of the electric field formed between the developer carrying member and the regulating member being 10x106 to 28.3x106 (V/m).