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US 5,636,062 AGranted
Apparatus for driving a lens
AssigneeNikon Corporation
InventorsTakeshi Okuyama, Hirotake Nozaki, Koutarou Murakami
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AssigneeNikon Corporation
InventorsTakeshi Okuyama, Hirotake Nozaki, Koutarou Murakami
Estimating the term…
Disclosed is an apparatus for driving a lens, having first and second movable lens groups movable along an optic-axis direction, a crank member for moving the first and second movable lens groups along the optic-axis direction in a predetermined mutual relationship, a first moving member for moving the first movable lens group along the optic-axis direction by a force received from the crank member, a second moving member for moving the second movable lens group along the optic-axis direction by the force received by the crank member and a compensating device, disposed between the second movable lens group and the second moving member, for compensating a deviation quantity of the second movable lens group from a predetermined moving quantity.
An apparatus for driving a lens, comprising:
An apparatus for driving a lens, comprising:
An apparatus for driving a lens, comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
Term ended 3 Jun 2014 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to a lens driving apparatus disposed for moving lens groups in an enlarger, a telescope and a microscope, etc., and more particularly, to a lens driving apparatus for moving a plurality of movable lens groups such as zoom lens, etc., in a predetermined relationship.
2. Related Background Art
Other objects and advantages of the present invention will become apparent during the following discussion in conjunction with the accompanying drawings, in which:
FIG. 1 is a diagram illustrating a first embodiment of a lens driving apparatus of this invention;
FIG. 2 is a side view showing a support mechanism of a motor for rotating a driving crank;
Preferred embodiments of the present invention will hereinafter be described in detail with reference to the drawings.
FIG. 1 illustrates a first embodiment of a lens driving apparatus according to this invention. The numeral 1 designates a unit of some elements of an optical system in which first and second movable lens groups 2, 3 move on the optic axis in a predetermined relationship, whereby functions of variable power or focusing, etc. come to work.
Note that the lens driving apparatus in this embodiment is constructed to make a moving velocity of the first movable lens group 2 higher than a moving velocity of the second movable lens group 3. Further, a moving stroke of the first movable lens group 2 is set longer than a moving stroke of the second movable lens group 3. A tolerance of positional error of the first movable lens group 2 is set smaller than a tolerance of positional error of the second movable lens group 3.