| 摘要 |
Scanning imaging systems are described in which an image of a viewed area is scanned across a detector by a line and frame scanning arrangement including a rotatable faceted mirror drum which is of smaller size than hitherto as radiation going to and from the drum passes through an optical system of two elements separated by their focal length. For radiation passing to the drum the optical system can be an objective lens and a collimating lens to produce a small exit pupil within the circumcircle of the drum facets. The drum and a plane oscillatable mirror may both scan the viewed area image of collimated radiation across the detector to permit the generation of a sequential radiation intensity signal and recreate an image, which may be viewable by eye through the optical system, by scanning a beam of parallel light of intensity corresponding to the radiation signal.
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