Patent ID: 11650521

Abstract:
A developing device includes a developing container, a first stirring conveyance member, a second stirring conveyance member, a developer carrying member, a toner concentration sensor, and a scraper. The first stirring conveyance member includes a rotary shaft, a first conveyance blade that is formed on an outer circumferential surface of the rotary shaft and conveys a developer in a first direction, and a second conveyance blade that has the opposite phase to the first conveyance blade and has a lower radial height than the first conveyance blade. The scraper is arranged substantially parallel to the rotary shaft at a position shifted in an axial direction from intersections between the first conveyance blade and the second conveyance blade and has a phase of 45° to 135° with respect to the closest one of the intersections on an upstream side in the first direction.