Zooming mechanism for zoom lens
First Claim
1. A zooming mechanism for a zoom lens including a plurality of lens groups, comprising:
- a zooming frame movable in a direction of an optical axis with respect to a stationary member and carrying at least one lens group;
drive means for moving the zooming frame in the direction of the optical axis;
a carrier frame carrying another zoom lens group and supported by a support member within the zooming frame for movement back and forth in the direction of the optical axis;
means for deriving a rotational drive responsive to the movement of the zooming frame in the direction of the optical axis;
and means responsive to said .Iadd.means .Iaddend.for deriving a rotational drive .[.means.]. to cause a non-linear movement of the carrier frame.
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Accused Products
Abstract
A zooming mechanism for a zoom lens comprises a zooming frame disposed for translation back and forth with respect to a stationary member in the direction of an optical axis and carrying a focus lens group in a manner to permit its focus adjustment; a drive for translating the zooming frame in the direction of the optical axis, a carrier frame for carrying another zoom lens group and supported within the zooming frame by a support member located therein for translation back and forth in the direction of the optical axis, a device for deriving a rotational drive in association with the translation of the zooming frame in the direction of the optical axis, and a device responsive to the rotational drive to cause a non-linear movement of the carrier frame. A rotational drive is derived in association with the translation of the zooming frame in the direction of the optical axis, and utilized by said non-linear moving device to cause a non-linear movement of the carrier frame to achieve a zooming operation.
26 Citations
40 Claims
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1. A zooming mechanism for a zoom lens including a plurality of lens groups, comprising:
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a zooming frame movable in a direction of an optical axis with respect to a stationary member and carrying at least one lens group; drive means for moving the zooming frame in the direction of the optical axis; a carrier frame carrying another zoom lens group and supported by a support member within the zooming frame for movement back and forth in the direction of the optical axis; means for deriving a rotational drive responsive to the movement of the zooming frame in the direction of the optical axis; and means responsive to said .Iadd.means .Iaddend.for deriving a rotational drive .[.means.]. to cause a non-linear movement of the carrier frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A zooming mechanism for a zoom lens including a plurality of lens groups, comprising:
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a zooming frame linearly movable in the direction of an optical axis and carrying at least one lens group; drive means for moving said zooming frame; a carrier frame slidably disposed within said zooming frame and carrying another lens .[.groups.]. .Iadd.group.Iaddend.; and means responsive to linear movement of said zooming frame for moving said carrier frame in a non-linear manner. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A zooming mechanism for a zoom lens, comprising;
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a zooming frame provided on a zoom lens having a plurality of lens groups, said frame being movable back and forth in the direction of an optical axis with respect to a stationary member and carrying at least one lens group in such a manner that the lens group is movable back and forth in the direction of said optical axis; drive means for moving said zooming frame in the direction of said optical axis; a carrier frame movably disposed within said zoom frame by a support member provided in the zooming frame, said carrier frame being movable back and forth in the direction of said optical axis and carrying another lens group; means for deriving a rotational drive responsive to the movement of the zooming frame in the direction of said optical axis, said means being rotatably supported on said zooming frame; and means rotatably supported on said zooming frame, which is rotated by said rotational drive for moving said carrier frame in a non-linear manner. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A zooming system of a zoom lens composed of a plurality of lens groups having a common optical axis comprising:
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a zooming frame supporting at least one lens group and movable in back-and-forth directions of the optical axis; driving means for selectively moving said zooming frame in one of said back-and-forth directions; a carrier frame supporting another zoom lens group being movably supported for back-and-forth movement along said optical axis; intermediate driving means responsive to movement of said zooming frame for providing a rotational output; and means for moving said carrier frame in a non-linear manner responsive to the rotational output of said intermediate driving means. .Iaddend. .Iadd.41. A zooming system of a zoom lens according to claim 40 wherein said intermediate driving means rotates about an axis perpendicular to said optical axis. .Iaddend.
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Specification