| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus that exactly detects that toner to be supplied to a developing device is unavailable or nearly unavailable, and prevent the occurrence of carrier adherence to a photoreceptor and reduction in image density due to decrease in toner concentration.SOLUTION: The image forming apparatus 100 is equipped with: a developing device 2; a toner supply device 22; a toner supply detecting sensor 119; a toner concentration control means for directing toner supply; and a toner empty detection means 400. The image forming apparatus 100 is further equipped with, as the toner empty detection means 400: a storage means 401 for storing the output difference of the toner supply detection sensor 119 before and after the toner supply; a toner supply quantity determination means 404 for determining that the amount of toner remaining in the toner supply device 22 is low and the amount of toner supply is low when the output difference or output ratio of the sensor is lower than a stipulated level Va; and an image quality adjustment control means 405 for instructing to perform process control in the above case. |
