Back to results
US 9,176,307 B2Granted
Zoom lens system, optical apparatus, and method for manufacturing zoom lens system
AssigneeNikon Corporation
InventorSatoshi Hayakawa
Life of this patent
Estimating the term…
Abstract
A zoom lens system ZL comprising, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; a fourth lens group G4 having negative refractive power; and a fifth lens group G5 having positive refractive power; upon zooming the first lens group G1 being fixed with respect to an image plane in the direction of the optical axis, upon focusing at least a portion of the third lens group G3 being moved along the optical axis, and the zoom lens system satisfying predetermined conditions. An optical apparatus is equipped with the zoom lens system, and there is a method for manufacturing the zoom lens system.
Claims27
A zoom lens system comprising, in order from an object side:
- a first lens group having positive refractive power;
- a second lens group having negative refractive power;
- a third lens group having positive refractive power;
- a fourth lens group having negative refractive power;
- and a fifth lens group having positive refractive power;
- upon zooming the first lens group being fixed with respect to an image plane in the direction of the optical axis,
- upon focusing at least a portion of the third lens group being moved along the optical axis, and
- the zoom lens system satisfying the following conditional expression:
- 0.010<f1/f3<1.410,
- where f1 denotes a focal length of the first lens group, and
- f3 denotes a focal length of the third lens group,
- wherein
- upon zooming from a wide angle end state to a telephoto end state, a distance between the first lens group and the second lens group is increased, a distance between the second lens group and the third lens group is decreased, a distance between the third lens group and the fourth lens group is increased, and a distance between the fourth lens group and the fifth lens group is decreased.
10 more elements
A method for manufacturing a zoom lens system which comprises, in order from an object side:
- a first lens group having positive refractive power;
- a second lens group having negative refractive power;
- a third lens group having positive refractive power;
- a fourth lens group having negative refractive power;
- and a fifth lens group having positive refractive power, the method comprising steps of disposing the lens groups such that, upon zooming, the first lens group being fixed with respect to an image plane in the direction of the optical axis;
- disposing the lens groups such that, upon focusing, at least a portion of the third lens group is moved along the optical axis, and disposing the lens groups such that the zoom lens system satisfies the following conditional expression:
- 0.010<f1/ f3<1.410,
- where f1 denotes a focal length of the first lens group, and f3 denotes a focal length of the third lens group,
- wherein upon zooming from a wide angle end state to a telephoto end state, a distance between the first lens group and the second lens group is increased, a distance between the second lens group and the third lens group is decreased, a distance between the third lens group and the fourth lens group is increased, and a distance between the fourth lens group and the fifth lens group is decreased.
6 more elements
A zoom lens system comprising, in order from an object side:
- a first lens group having positive refractive power;
- a second lens group having negative refractive power;
- a third lens group having positive refractive power;
- a fourth lens group having negative refractive power;
- and a fifth lens group having positive refractive power;
- upon zooming the first lens group being fixed with respect to an image plane in the direction of the optical axis,
- upon focusing at least a portion of the third lens group being moved along the optical axis, and
- the zoom lens system satisfying the following conditional expression:
- 0.010<f1/f3<1.410,
- where f1 denotes a focal length of the first lens group, and
- f3 denotes a focal length of the third lens group,
- wherein,
- upon zooming, the second lens group, the third lens group, the fourth lens group and the fifth lens group are moved.
10 more elements
A method for manufacturing a zoom lens system comprising:
- providing in order from an object side:
- a first lens group having positive refractive power;
- a second lens group having negative refractive power;
- a third lens group having positive refractive power;
- a fourth lens group having negative refractive power;
- and a fifth lens group having positive refractive power;
- constructing the zoom lens system such that:
- upon zooming the first lens group being fixed with respect to an image plane in the direction of the optical axis,
- upon focusing at least a portion of the third lens group being moved along the optical axis, and
- the zoom lens system satisfies the following conditional expression:
- 0.010<f1/f3<1.410,
- where f1 denotes a focal length of the first lens group, and
- f3 denotes a focal length of the third lens group, and
- upon zooming, the second lens group, the third lens group, the fourth lens group and the fifth lens group are moved.
11 more elements
A zoom lens system comprising, in order from an object side:
- a first lens group having positive refractive power;
- a second lens group having negative refractive power;
- a third lens group having positive refractive power;
- a fourth lens group having negative refractive power;
- and a fifth lens group having positive refractive power;
- upon zooming the first lens group being fixed with respect to an image plane in the direction of the optical axis,
- upon focusing at least a portion of the third lens group being moved along the optical axis, and
- the zoom lens system satisfying the following conditional expression:
- 0.010<f1/f3<1.410,
- where f1 denotes a focal length of the first lens group, and
- f3 denotes a focal length of the third lens group,
- wherein the following conditional expression is satisfied:
- 0.370<f3/(−f4)<0.620,
- where f4 denotes a focal length of the fourth lens group.
11 more elements
A method for manufacturing a zoom lens system comprising:
- providing in order from an object side:
- a first lens group having positive refractive power;
- a second lens group having negative refractive power;
- a third lens group having positive refractive power;
- a fourth lens group having negative refractive power;
- and a fifth lens group having positive refractive power;
- constructing the zoom lens system such that:
- upon zooming the first lens group being fixed with respect to an image plane in the direction of the optical axis,
- upon focusing at least a portion of the third lens group being moved along the optical axis, and
- the zoom lens system satisfies the following conditional expression:
- 0.010<f1/f3<1.410,
- where f1 denotes a focal length of the first lens group, and
- f3 denotes a focal length of the third lens group,
- and the following conditional expression is satisfied:
- 0.370<f3/(−f4)<0.620,
- where f4 denotes a focal length of the fourth lens group.
13 more elements
A zoom lens system comprising, in order from an object side:
- a first lens group having positive refractive power;
- a second lens group having negative refractive power;
- a third lens group having positive refractive power;
- a fourth lens group having negative refractive power;
- and a fifth lens group having positive refractive power;
- upon zooming the first lens group being fixed with respect to an image plane in the direction of the optical axis,
- upon focusing at least a portion of the third lens group being moved along the optical axis, and
- the zoom lens system satisfying the following conditional expression:
- 0.010<f1/f3<1.410,
- where f1 denotes a focal length of the first lens group, and
- f3 denotes a focal length of the third lens group,
- wherein the following conditional expression is satisfied:
- 1.140<(−f4)/f5<1.540,
- where f4 denotes a focal length of the fourth lens group, and
- f5 denotes a focal length of the fifth lens group.
12 more elements
A method for manufacturing a zoom lens system comprising:
- providing in order from an object side:
- a first lens group having positive refractive power;
- a second lens group having negative refractive power;
- a third lens group having positive refractive power;
- a fourth lens group having negative refractive power;
- and a fifth lens group having positive refractive power;
- constructing the zoom lens system such that:
- upon zooming the first lens group being fixed with respect to an image plane in the direction of the optical axis,
- upon focusing at least a portion of the third lens group being moved along the optical axis, and
- the zoom lens system satisfies the following conditional expression:
- 0.010<f1/f3<1.410,
- where f1 denotes a focal length of the first lens group, and
- f3 denotes a focal length of the third lens group,
- and the following conditional expression is satisfied:
- 1.140<(−f4)/f5<1.540,
- where f4 denotes a focal length of the fourth lens group, and
- f5 denotes a focal length of the fifth lens group.
14 more elements
Dependencies are inferred from the claim text.