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DETECTING SYSTEMS AND THE LIKE

  • US 3,711,722 A
  • Filed: 07/28/1958
  • Issued: 01/16/1973
  • Est. Priority Date: 07/28/1958
  • Status: Expired due to Term
First Claim
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1. A light-collecting and detecting system comprising a lens having an annularly shaped toric refracting surface formed thereon in concentric relation to a central axis of said system, and in predetermined spaced relation to a preselected focal point on said axis, said lens having a second surface thereon transversely intersecting said axis substantially at said focal point, a layer of photosensitive material of relatively small size carried by said second surface adjacent said focal point, said annular refracting surface being, in all radial sections thereof, so disposed in offset relation to said axis and so spaced relative to said focal point and so convexly elliptically curved as to face outwardly in predetermined angular relation to said optical axis and simultaneously direct and concentrate substantially all of the light being received from corresponding parts of a conically shaped hollow annular object field of predetermined mean angular value and width onto said layer, whereby any material change in intensity in the light being received from any part of said annular object field will be detected by said photosensitive layer.

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