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High-efficiency symmetrical scanning optics

  • US 4,274,703 A
  • Filed: 10/29/1979
  • Issued: 06/23/1981
  • Est. Priority Date: 08/01/1977
  • Status: Expired due to Term
First Claim
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1. A flying spot optical scanning system for sweeping an optical scanning spot across an imaging surface, said system comprising the combination ofa source for supplying a light beama beam scanning element having a plurality of reflective facets circumferentially distributed in a tangential plane about an axis of rotation;

  • means for rotating said scanning element on said axis of rotation, whereby said facets serially intercept and reflect said light beam;

    lens means optically interposed between said source and said surface for serially focusing the light beam onto successive ones of said facets and for refocusing light reflected from said facets onto said surface, said lens means being substantially symmetrical about an optical axis which is essentially normal to said axis of rotation, said light beam underfilling and remaining fully seated on the facet upon which it is focused while the reflected light is scanned through a predetermined scan angle.

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