Vibration-proof zoom lens and camera provided with the same
First Claim
1. A vibration-proof zoom lens for preventing deviation of an image of a subject when vibration of camera occurs, said image of the subject being formed on an image plane, said zoom lens comprising:
- a positive first lens group fixed at a side of said subject;
a negative second lens group disposed between said first lens group and said image plane so as to be movable along an optical axis of said zoom lens, said second lens group moving toward said image plane to change a magnification from a wide-angle end to a telephoto end;
a positive third lens group disposed between said second lens group and said image plane, said third lens group including a first subgroup, a second subgroup and a third subgroup, and said second subgroup being moved in a plane perpendicular to said optical axis to correct a blur of said image at a time of the vibration of said camera;
a positive fourth lens group disposed between said third lens group and said image plane so as to be movable along said optical axis, said fourth lens group being moved to correct variation of said image plane, which is caused in accordance with a change of the magnification, and to perform focusing; and
a positive fifth lens group fixed between said fourth lens group and said image plane.
1 Assignment
0 Petitions
Accused Products
Abstract
A vibration-proof zoom lens comprises a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a positive fifth lens group, which are disposed in this order from a subject side. The second lens group moves toward an image side at a time when magnification changes from a wide-angle end to a telephoto end. The fourth lens group moves to correct variation of an image plane at the time of magnification change. The first, third and fifth lens groups are fixed. The third lens group is composed of first to third subgroups. When vibration occurs, the second subgroup is moved in a plane perpendicular to an optical axis to correct an image position so that an image blur is prevented.
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Citations
11 Claims
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1. A vibration-proof zoom lens for preventing deviation of an image of a subject when vibration of camera occurs, said image of the subject being formed on an image plane, said zoom lens comprising:
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a positive first lens group fixed at a side of said subject;
a negative second lens group disposed between said first lens group and said image plane so as to be movable along an optical axis of said zoom lens, said second lens group moving toward said image plane to change a magnification from a wide-angle end to a telephoto end;
a positive third lens group disposed between said second lens group and said image plane, said third lens group including a first subgroup, a second subgroup and a third subgroup, and said second subgroup being moved in a plane perpendicular to said optical axis to correct a blur of said image at a time of the vibration of said camera;
a positive fourth lens group disposed between said third lens group and said image plane so as to be movable along said optical axis, said fourth lens group being moved to correct variation of said image plane, which is caused in accordance with a change of the magnification, and to perform focusing; and
a positive fifth lens group fixed between said fourth lens group and said image plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification