| 摘要 |
An optical scanning system suitable for use, for example, in a phototypesetting machine. The system is capable of either scanning an object image across a planar surface or scanning a planar object and forming a stationary image thereof. The optical system includes, at successive positions along an optical path, an image-forming objective, a movable scanning mirror and an optical device having a curved optical surface for causing the optical system to satisfy the Petzval condition for a flat image surface notwithstanding changes in the angular position of the scanning mirror.
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