| 摘要 |
The electrophotographic copying machine of the present disclosure includes a slit mechanism having two different forms of slits, an optical device to project the image of the original to be copied onto a photoreceptor surface a shifting mechanism for shifting the optical device between a first position suitable for performing an equal size copying operation and a second position suitable for performing a different size copying operation, such as a reduced size copying operation. During the equal size copying operation, the slit mechanism provides a slit having a large size, while during the other size copying operation, for example, a reduced size copying operation, the slit mechanism provides a slit having a different size, for example a small size, so as to maintain the distribution of the amount of exposure on the photoreceptor surface in a predetermined distribution regardless of the type of copying operation.
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