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Scanning device for radiation beams

  • US 4,121,883 A
  • Filed: 01/06/1977
  • Issued: 10/24/1978
  • Est. Priority Date: 04/22/1974
  • Status: Expired due to Term
First Claim
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1. A scanning device for a radiation beam, comprising:

  • a radiation beam source;

    scanning means for receiving the radiation beam from said source, and for deflecting the beam along a scanning surface in a predetermined scanning direction; and

    converging optical means interposed between said scanning means and the scanning surface to converge the scanning light beam from said scanning means onto said scanning surface, said converging optical means consisting of an afocal anamorphic optical system and a light beam converging optical device comprising an f-θ

    lens, wherein coincidence exists between a direction along which said afocal anamorphic optical system has no refractive power, and a scanning direction of the beam incident on said optical system, and wherein the radiant beam converged on the scanning surface scans said surface at a constant speed.

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