| 摘要 |
A multiple lens image rotation system includes an elongated base fixedly mounted to a microfilm reader apparatus having a plurality of projection lenses with different magnification levels on a carrier movably mounted with respect to the base. The carrier is adapted to move along an axis generally parallel to the longitudinal axis of the base defining a first position wherein one projection lens is aligned with an image projection path and a second position and subsequent positions wherein other projection lenses are aligned with the image projection path. A single image rotation prism is rotatably mounted in the image projection path for use with the plurality of projection lenses one at a time. The image rotation prism is adapted to rotate about an axis generally coaxial with the image projection path.
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