Zoom lens mount assembly
First Claim
Patent Images
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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Abstract
A zoom lens mount assembly in which a zooming cam frame is moved along the optical axis while rotating therearound and respective movable frames supporting an optical system are driven by such rotation and movement of the cam frame to effect a desired zooming. In another aspect there is provided a focussing cam frame adapted to be moved along the optical axis and to drive a movable frame provided with a focussing optical system and a program lens shutter.
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Citations
16 Claims
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1. Zoom lens mount assembly comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Zoom lens mount assembly comprising:
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an optical system having an optical axis; a generally cylindrical stationary frame including stationary cam followers; a plurality of movable frames adapted to support the optical system, the plurality of movable frames including a generally cylindrical main movable frame having a plurality of cam slots, said main movable frame being slidably received about an exterior surface of said stationary frame, and said stationary cam followers slidably engaging the corresponding number of the plurality of cam slots; and a generally cylindrical zooming cam frame slidably received about an exterior surface of said main movable 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 in camming engagement with said stationary cam followers of said stationary frame and being coupled to said main movable frame so that rotation of said zooming cam frame around an optical axis causes said main movable frame together with said cam frame to move along the optical axis with respect to said stationary frame. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A zoom lens mount assembly, comprising:
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an optical system comprising a plurality of lenses aligned to define an optical axis; a generally stationary frame having a cam follower; a main movable frame slidingly carried by the stationary frame and adapted to carry one or more lenses of the optical system; and a generally cylindrical zooming cam frame slidingly and rotationally carried by the stationary frame and rotationally coupled to the main movable frame, said zooming cam frame having a camming surface positioned to engage the stationary cam follower of the stationary frame upon rotation of the zooming cam frame and shaped so as to axially displace, upon rotation of the zooming cam frame, the zooming cam frame and the main movable frame which is rotationally coupled to the zooming cam frame. - View Dependent Claims (15, 16)
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Specification