| 摘要 |
Provided is a developing apparatus, including: a developer carrying member for carrying a developer containing toner and a carrier; a first chamber having an opening in which the developer carrying member is disposed; a carrying member for carrying the developer in a longitudinal direction of the developer carrying member, the carrying member being disposed in the first chamber; a second chamber to which the developer is supplied from the first chamber through a first connection portion communicating with the first chamber and which supplies the developer to the first chamber through a second connection portion communicating with the first chamber; a spiral carrying member for agitating and carrying the developer by rotation, the spiral carrying member being obliquely disposed in the second chamber at an angle of 2° or more and 10° or less; and a developer replenishing apparatus for replenishing a developer for replenishment to a developer replenishment position in the second chamber, in which when a height with respect to a rotation axis of the spiral carrying member of an intersection of a circumference of the spiral carrying member and a developer surface in a first vertical plane on a downstream side of a developer carrying direction with respect to the developer replenishment position is denoted by Ha (mm) and a height with respect to the rotation axis of an intersection of the circumference of the spiral carrying member and the developer surface in a second vertical plane on a 50-mm downstream side of the first vertical plane in a direction of a horizontal direction component of the developer carrying direction is denoted by Hb (mm), Ha (mm) and Hb (mm) in a state where an attitude of the spiral carrying member in the first vertical plane and an attitude of the spiral carrying member in the second vertical plane are the same satisfy the relationship of Ha (mm)+2 (mm)<=Hb (mm).
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