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Focusing screen including different height microlenses arranged in a cyclical pattern

  • US 5,177,637 A
  • Filed: 09/06/1991
  • Issued: 01/05/1993
  • Est. Priority Date: 09/11/1990
  • Status: Expired due to Term
First Claim
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1. In a focusing screen having a large number of microlenses regularly distributed in an array, the improvement wherein said microlenses are substantially uniformly cross-dimensioned and arranged as a plurality of intermingled groups, with the microlenses of each group having a predetermined height different from that of the microlenses of each other group and occupying a respective cyclical pattern of positions within said array.

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