| 摘要 |
PROBLEM TO BE SOLVED: To provide a toner adhesion amount measurement device capable of measuring toner adhesion amounts of both of a low toner adhesion amount of an area gradation region and a high toner adhesion amount of a density (thickness) gradation region by the single toner adhesion amount measurement device. ! SOLUTION: When a toner patch 71 or the like starts entering a detection range D, a sensor voltage VS of an optical sensor 8 increases from a reflection reference level LR and indicates a peak value PM or the like in response to an angle of inclination θ. When the toner patch 71 or the like is completely positioned inside the detection range D, the sensor voltage VS of the optical sensor 8 decreases from the reflection reference level LR due to diffuse reflection by toner particles of the toner patch 71 or the like and indicates a bottom value BM or the like. In order to detect a toner adhesion layer thickness of a density (thickness) gradation region, the angle of inclination θ of the optic |
