| 摘要 |
An image forming apparatus includes an image carrier, a developer for developing an electrostatic latent image on the image carrier, a transfer device for transferring the developed image on the image carrier onto a transfer medium, a feed device for feeding the transfer medium to a transfer portion by the transfer device, and an optical element for optically detecting the amount of developing agent in the developer. The optical element is arranged at a side opposite to the developer with respect to the convey path of the transfer medium.
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