| 摘要 |
A rear screen optic projection apparatus is provided having a multiple mirror reflection system mounted in a supporting enclosure and adapted for utilization with photographic projection equipment such as slide projectors and motion picture projectors. The reflector-type optic system of this apparatus includes three mirrors which are angularly displaced with respect to each other for providing a substantially long optical path from the projector to a viewing screen. The supporting structure is designed with a viewing screen and an entrance aperture for an image to be projected along the optical path. A plurality of the apparatus in a stored configuration by covering the viewing screen and closing the entrance aperture. Two door closure elements are provided the one element including two sections that pivot about respective vertical axes at each side of the aperture with the other door element pivoted about a horizontal axis to form an inverted U-shaped channel with the first door element when in an open configuration and thus shield the interior from ambient light that could otherwise enter the optical path through the aperture and interfere with the image to be projected.
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