| 摘要 |
In an optical instrument like photographic cameras, a light refracting optical element such as a prism having different parts effecting refraction in different directions is located substantially on an image plane of the objective of the optical instrument and periodically moved in the plane to bring the different parts to a point on the plane periodically. When the image formed on the plane is just focused on the light refracting optical element, the image viewed from behind stands still. When the image formed on the plane is out of focus, that is the image is not focused precisely on the light refracting optical element, the image viewed from behind periodically moves.
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