| 摘要 |
An image forming apparatus includes: a photosensitive member; an exposure portion; a developing portion; a sensor; a supply portion; a controller for controlling a developer amount based on density information outputted from the sensor after an electrostatic image for a supply control toner image is exposed to light under an exposure condition for supply control and then is developed into the supply control toner image, which is then detected by the sensor; a storing portion; and an exchange detecting portion. The controller is capable of executing an operation in a mode, in which the exposure condition for the supply control, based on information detected by the exchange detecting portion. In the mode, the exposure condition for the supply control is controlled based on the information stored in the storing portion and a detection result, by the sensor, of a control toner image formed during the operation in the mode. |
| 主权项 |
1. An image forming apparatus comprising:
a photosensitive member; an exposure portion for exposing said photosensitive member to light to form an electrostatic image; a developing portion for developing the electrostatic image on said photosensitive member with a developer containing a toner and a carrier; a sensor for detecting a toner image formed by said developing portion to output density information depending on a toner amount per unit area; a supply portion for supplying the developer to said developing portion; a controller for controlling an amount of the developer, to be supplied from said supply portion, on the basis of the density information, wherein the density information is outputted from said sensor after an electrostatic image for a supply control toner image is exposed to light by said exposure portion under an exposure condition for supply control and then is developed by said developing portion into the supply control toner image, which is then detected by said sensor; a storing portion for storing the density information outputted from said sensor; and an exchange detecting portion for detecting information for discriminating exchange of said photosensitive member, wherein said controller is capable of executing an operation in a mode, in which the exposure condition for the supply control is adjusted, on the basis of the information detected by said exchange detecting portion, and wherein in the mode, the exposure condition for the supply control is controlled on the basis of the information stored in said storing portion and a detection result of a control toner image, which is formed during the operation in the mode, detected by said sensor. |
