Variable-focus optical element and focus detecting device utilizing the same

  • US 4,802,746 A
  • Filed: 02/25/1986
  • Issued: 02/07/1989
  • Est. Priority Date: 02/26/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. A variable-focus optical element comprising:

  • plural elastic members laminated in the direction of an optical axis; and

    deforming means for deforming said elastic members thereby causing a surface thereof to protrude or retract from a determined aperture;

    the elastic modulus of a first elastic member positioned at the protruding or retracting side of said plural elastic members being larger than that of a second elastic member neighboring said first elastic member.

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