TONER AMOUNT DETECTION MECHANISM, DEVELOPING DEVICE, PROCESS UNIT, AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To improve the accuracy of detecting the amount of toner stored in a toner storage part.SOLUTION: In a toner amount detection mechanism 50 of the present invention, a first light guide member 53 and a second light guide member 54 respectively include main body parts 53a and 54a, and covering materials 53b and 54b that partially cover the main body parts 53a and 54a to form a light output surface P1 or a light input surface P2. The covering materials 53b and 54b have translucency, and are formed of a material having an electrostatic property to the material of a rubbing part 60a of a cleaning member 60 lower than that of the material of the main body parts 53a and 54a.