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Apparatus for driving objective lens

  • US 4,472,024 A
  • Filed: 01/07/1982
  • Issued: 09/18/1984
  • Est. Priority Date: 01/07/1981
  • Status: Expired due to Fees
First Claim
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1. An apparatus for driving an objective lens in its optical axis direction for effecting a focussing control comprising:

  • a cylindrical frame;

    means for holding the objective lens;

    a plurality of spiral leaf springs, each partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each spiral leaf spring having a centrally located annular root portion fixed to the objective lens holding means and each sprial leaf spring having a plurality of arcuate arms having two ends occurring in a plane which is substantially perpendicular to the optical axis of the objective lens, a first end is fixed to said cylindrical frame and a second end is fixed to said annular root portion;

    means for driving the objective lens in the optical axis direction in accordance with a focus control signal, thereby correcting any focussing error; and

    a plurality of damping members partially extending in a plane which is substantially perpendicular to the optical axis of the objective lens, each of said damping members contacting a spiral leaf spring near said annular root portion of the spiral leaf spring.

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