Patent ID: 9606489
Date: 2017-03-28
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: a rotatable image bearing member; a developer bearing member configured to bear a developer while rotating and form a toner image on a surface of the image bearing member by supplying toner contained in the developer to the image bearing member; a density detection section configured to detect density of the toner image formed on the surface of the image bearing member; a correction amount calculation section configured to calculate a correction amount for correcting density unevenness of the toner image caused in a sub-scanning direction that is a rotating direction of the developer bearing member based on a detection result of the density detection section; a correction section configured to correct the density unevenness based on the correction amount calculated by the correction amount calculation section; a conveyance amount calculation section configured to calculate an amount of the developer conveyed on the developer bearing member as a developer conveyance amount; and a control section configured to use a first developer conveyance amount and a first correction amount calculated by the conveyance amount calculation section and the correction amount calculation section respectively in a first state, a second developer conveyance amount and a second correction amount calculated by the conveyance amount calculation section and the correction amount calculation section respectively in a second state in which the developer conveyance amount is smaller than the developer conveyance amount of the first state, and a third developer conveyance amount detected by the conveyance amount calculation section in a third state in which the developer conveyance amount is smaller than the developer conveyance amount of the first state and is larger than the developer conveyance amount of the second state to calculate a third correction amount for correcting density unevenness of the toner image in the third state, and perform control to correct the density unevenness of the toner image based on the calculated third correction amount.