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Variable-focal-length lens

  • US 4,564,267 A
  • Filed: 12/27/1982
  • Issued: 01/14/1986
  • Est. Priority Date: 01/07/1982
  • Status: Expired due to Term
First Claim
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1. A variable-focal-length lens comprising:

  • a lens system including at least one set of electrooptic crystals cemented together on curved surfaces thereof so that the directions of their respective axes of rotatory inversion are coincident with each other and so that the directions of their respective two corresponding rotation axes differ from each other;

    means for applying an electric field of uniform intensity distribution to said cemented surfaces of said electrooptic crystals so as to make said cemented surfaces refraction surfaces having a lens action; and

    means for varying the intensity of the electric field to be applied, to thereby vary the focal length of said lens system.

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