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Magnetically coupled lens actuator

  • US 5,056,902 A
  • Filed: 04/25/1990
  • Issued: 10/15/1991
  • Est. Priority Date: 04/25/1990
  • Status: Expired due to Term
First Claim
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1. An apparatus for adjusting the position of a lens, comprising:

  • a sealed chamber surrounding said lens, said chamber including a window to permit light to enter said chamber and said lens;

    an actuator held inside said chamber, said actuator being movable with respect to said chamber, said actuator being arranged to cause motion of said lens when said actuator is moved, said actuator having a plurality of projections that extend radially toward an inner surface of said chamber to provide a spacing between said actuator and said inner surface that is less at said projections than in a region of said actuator disposed between said projections; and

    an element held outside said chamber and ferromagnetically coupled to at least some of said projections of said actuator through a surface of said chamber, said element being movable relative to said chamber to cause movement of said actuator to thereby adjust the position of said lens.

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