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VIEW EXPANDING AND DIRECTING OPTICAL SYSTEM

  • US 3,809,461 A
  • Filed: 05/12/1972
  • Issued: 05/07/1974
  • Est. Priority Date: 05/12/1972
  • Status: Expired due to Term
First Claim
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1. A view expanding and directing optical unit comprising the combination of optical elements including a Fresnel lens having a negative focal length and a Fresnel prism, said lens and prism located adjacent one another and arranged to intersect a desired line of sight to provide to a person viewing along said line of sight an expanded field of view in which the objects in said field of view are demagnified;

  • said optical elements each including a grooved and a generally flat side;

    the generally flat side of one of said otpical elements facing away from said other optical element.

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