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Zoom lens mount assembly

  • US 5,037,187 A
  • Filed: 07/14/1989
  • Issued: 08/06/1991
  • Est. Priority Date: 08/12/1988
  • Status: Expired due to Term
First Claim
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1. Zoom lens mount assembly comprising:

  • an optical system having an optical axis;

    a plurality of movable frames including a main movable frame adapted to support the optical system, at least one of the movable frames having a plurality of cam followers;

    a zooming cam frame for moving the plurality of movable frames in operative association with rotation of said zooming cam frame to achieve an optical variable magnification, said zooming cam frame being coupled to said main movable frame of the plurality of movable frames so that, around the optical axis, only said zooming cam frame is rotatable but, along the optical axis, said zooming cam frame is movable together with said main movable frame;

    a stationary frame having stationary cam followers; and

    at least first and second sets of cam tracks provided on said zooming cam frame, the first set of cam tracks being operatively associated with said stationary cam followers and the second set of cam tracks being operatively associated with the cam followers of the one movable frame wherein the respective movable frames are moved along the optical axis by rotation of said zooming cam frame and the movement of said zooming cam frame along the optical axis occurs concurrently with said rotation thereof.

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