Optical apparatus for scanning radiation over a surface.

摘要

Optical apparatus for scanning radiation over a surface includes a plurality of angularly spaced rotating arms 74, 76, 78 extending from a central axis. A central reflector 134 is positioned at the axis of the arms and a radially remote reflector 120 is positioned on each arm for folding an optical radiation path toward the object to be scanned. The central reflector rotates with the arms but is sequentially indexed into optical path alignment with each radially remote reflector so that a beam of radiation in the optical path is scanned over the same predetermined arcuate segment by each of the remote reflectors.