Patent attributes
An image forming apparatus includes an image density control feature based on a result detected by an image density detection portion, wherea developer amount per 10 mm in a longitudinal direction of a first chamber of a developer carrying member is Y (g),a developer carrying velocity in the longitudinal direction inside the first chamber is VD (mm/sec),a toner carrying amount per unit area on an image bearing member when forming a maximum density is M (mg/cm2),a surface movement velocity of the image bearing member is Vp (mm/sec), anda distance from a position furthest downstream in a developer conveyance direction in a maximum area in which development is possible on the developer carrying member to a predetermined detection position in the maximum area in the longitudinal direction is X (mm),and the following relation is satisfied:X≦(45×Y×VD)/(M×Vp).
