| 摘要 |
<p>In an image forming apparatus, the magnetic sensor obtains an output value varying with a magnetic toner amount in a development device. The correlative data storing part prestores correlative data relating to the output value when there is no magnetic toner in the development device and the output value when the magnetic toner amount is a predetermined setting value. The standard value storing part prestores an initial value of a standard value being the output value when the magnetic toner amount is the setting value. The standard value setting part makes the standard value storing part store the output value corresponding to the magnetic toner amount being the setting value, as new standard value, by the output value when there is no magnetic toner in the development device and the correlative data. The toner amount deciding part decides the magnetic toner amount by the output value and the standard value.</p> |
