| 摘要 |
A microfilm copying apparatus magnifies and copies images on microfilms. The microfilm copying apparatus can be constructed as a microfilm reader-printer. The microfilm copying apparatus has an illuminating optical system for illuminating a microfilm having an image to be copied and a slit exposure optical system having a projection lens. The illuminating optical system and the projection lens are movable in optically coaxial relation in a direction normal to a common optical axis thereof in synchronism with movement of the surface of the photosensitive body. Where the microfilm copying apparatus is constructed as a microfilm reader-printer, it has a screen housing unit disposed above a base apparatus portion and angularly movable into and out of contact therewith, and a light shielding plate is mounted on a first exposure mirror having a reflecting surface which is positioned in a focused light beam from the microfilm image when the microfilm image is copied. When the microfilm image is copied, external light from a screen is prevented by the light shielding plate from falling on the first exposure mirror.
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