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Convergent beam scanner linearizing method and apparatus

  • US 5,874,733 A
  • Filed: 10/16/1997
  • Issued: 02/23/1999
  • Est. Priority Date: 10/16/1997
  • Status: Expired due to Fees
First Claim
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1. An apparatus for position encoding in a convergent beam scanned imaging system, comprising:

  • gradation means affixed to a reflective surface for providing increments of position of said reflective surface, said reflective surface both rotating and substantially linearly translating in a reference plane that is substantially perpendicular to said reflective surface such that said reflective surface substantially follows a locus of tangents to an ellipse in said reference plane, said ellipse being substantially fixed in said reference plane, said gradation means moving substantially with said reflective surface in said reference plane; and

    position encoding means located at a position along said gradation means and substantially fixed in said reference plane for monitoring movement of said gradation means and, thereby monitoring said rotation and said substantially linear translation of said reflective surface, said position encoding means for outputting a signal indicative of said rotation and a portion of said substantially linear translation of said reflective surface, said position optimized such that said signal is substantially linear with respect to an object space angle.

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