| 摘要 |
A developer supply device supplies a toner supply amount to a developing chamber based on an output of an inductance sensor. An elapsed time is set such that the toner supply amount is smaller with respect to the same output of the inductance sensor when the elapsed time after conveyance start of a developer according to an image formation start signal is less than a predetermined time until a surface level of the developer is stabilized than when the elapsed time is equal to or greater than the predetermined time. As the elapsed time approaches the predetermined time, a ratio at which the toner supply amount is set to be small with respect to the same output of the inductance sensor is reduced.
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