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OPTICAL RASTER SCAN GENERATOR

  • US 3,764,192 A
  • Filed: 05/28/1971
  • Issued: 10/09/1973
  • Est. Priority Date: 05/28/1971
  • Status: Expired due to Term
First Claim
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1. Apparatus for producing a non-astigmatic raster scan for an infrared detector suitable for use with an afocal magnifying system, said apparatus being characterized by:

  • a rotatable mirror structure mounted for rotation about a spin axis relative to said frame, including a plurality of radially directed axes defined on and rotating with said structure perpendicular to said spin axis, said axes being substantially uniformly spaced about said spin axis, a plurality of mirror surfaces on said mirror structure, each said mirror surface being perpendicular to a different one of said radial axes;

    means forming a mirror surface, mounted for oscillation relative to said frame about an oscillation axis parallel to a plane which is perpendicular to said spin axis;

    said oscillating mirror being positioned in a light path which periodically includes each of said rotating mirror surfaces, said oscillation axis orthogonally passing through a point on a locus of oscillation centers, said locus lying in the plane of the central rays incident on and reflected from said oscillating mirror and making an angle Beta with said reflected ray which is equal to the angle of incidence ( Beta ) of said central ray on said oscillating mirror when said mirror is in its nominal central position so that the orthogonally directed scans produced by said rotatable mirror and said oscillating mirror both appear to originate from substantially the same spot on a surface of said rotatable mirror.

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