DEVELOPER DETERIORATION DETECTION METHOD, DEVELOPER DETERIORATION DETECTOR, DEVELOPING DEVICE, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD

摘要

PROBLEM TO BE SOLVED: To provide; a developer deterioration detection method of favorably detecting deterioration of a developer containing toner and magnetic carrier while collateralizing the suppression of cost; a developer deterioration detector using this method; a developing device having the developer deterioration detector; an image forming apparatus using this method or having these devices; and an image forming method using this method or these devices.

SOLUTION: Detection means 18, 88, 89, and 90 are used which detect deterioration of the developer containing toner and carrier, on the basis of a prescribed characteristic of the developer moved by a moving member for moving the developer.

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