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Wide angle binocular system with variable power capability

  • US 5,532,875 A
  • Filed: 11/09/1994
  • Issued: 07/02/1996
  • Est. Priority Date: 03/09/1993
  • Status: Expired due to Fees
First Claim
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1. A variable power eyepiece for viewing a real intermediate image comprising a negative lens unit, a first positive lens unit, a second positive lens unit, and means for moving the second positive lens unit, wherein:

  • (a) the negative lens unit is positioned before the real intermediate image and provides aberration correction for the eyepiece;

    (b) the first positive lens unit is positioned after the real intermediate image and has only positive lens elements; and

    (c) the second positive lens unit is positioned between the negative lens unit and the first positive lens unit, in the vicinity of the real intermediate image, variation in the power of the eyepiece being achieved by movement of the second positive lens unit by the means for moving.

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