| 摘要 |
An electrophotographic copying apparatus provided with a light receiving device disposed in a light path for receiving the light from the original document, a light shielding device disposed before the light receiving device and capable of altering a light receiving range of the light receiving device, a device for controlling a light shielding amount of the light shielding device so as to correspond to a size of the original document, and a device for controlling the image forming device based on outputs of the light receiving device.
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