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Light absorption device for the prevention of stray light in particular in a phototypesetter

  • US 4,185,902 A
  • Filed: 06/02/1978
  • Issued: 01/29/1980
  • Est. Priority Date: 06/03/1977
  • Status: Expired due to Term
First Claim
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1. An absorption device for use in a light ray projection system of a phototypesetter, having a primary ray and a secondary ray projection and wherein the secondary ray is directed into the primary ray with a partially translucent and partially reflecting surface, said surface being arranged within the path of said primary ray and said secondary ray projection, and including an absorption body disposed in an extension of the secondary ray projection from the backside of said partially reflecting and partially translucent surface, said absorption body arranged to absorb radiation of said secondary ray, said absorption body having a concave surface arranged to direct said secondary ray at an angle relative to the direction of the secondary ray projection and at a focal point, and black body means for absorbing light placed at the focal point for absorbing light from said concave surface.

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