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Zoom lens system, optical apparatus, and method for forming an image

A zoom lens and lens group technology, applied in the field of zoom lens system, can solve the problems of low zoom ratio, can not fully meet the needs of high zoom ratio, etc., and achieve the effect of high zoom ratio and high optical performance

Inactive Publication Date: 2008-12-03
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But such a conventional zoom lens with a low zoom ratio cannot sufficiently satisfy the need for a high zoom ratio

Method used

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  • Zoom lens system, optical apparatus, and method for forming an image
  • Zoom lens system, optical apparatus, and method for forming an image
  • Zoom lens system, optical apparatus, and method for forming an image

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0094] FIG. 1 is a sectional view showing a lens layout of a zoom lens system according to Example 1 together with a zoom locus of each lens group.

[0095] The zoom lens system according to Example 1 is composed of, in order from the object along the optical axis: 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; and a fourth lens group having positive refractive power disposed on the most image plane I side.

[0096] When zooming from the wide-angle end state W to the telephoto end state T, the first lens group G1, the third lens group G3, and the fourth lens group G4 move toward the object, and the second lens group G2 moves so that the first lens group The distance between G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, and the distance between the third lens group G3 and the...

example 2

[0206] 4 is a sectional view showing a lens layout of a zoom lens system according to Example 2 together with a zoom locus of each lens group.

[0207] The zoom lens system according to Example 2 is composed of the following parts in order from the object along the optical axis: the first lens group G1 having positive refractive power, the second lens group G2 having negative refractive power, the second lens group G2 having positive refractive power, The third lens group G3 with refractive power, and the fourth lens group with positive refractive power disposed on the most image plane I side.

[0208] When zooming from the wide-angle end state W to the telephoto end state T, the first lens group G1, the third lens group G3, and the fourth lens group G4 move toward the object, and the second lens group G2 moves so that the first lens group The distance between G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 d...

example 3

[0307] 7 is a sectional view showing a lens layout of a zoom lens system according to Example 3 together with a zoom locus of each lens group.

[0308] The zoom lens system according to Example 3 is composed of the following parts in order from the object along the optical axis: the first lens group G1 having positive refractive power, the second lens group G2 having negative refractive power, the second lens group G2 having positive refractive power, The third lens group G3 with refractive power, and the fourth lens group with positive refractive power disposed on the most image plane I side.

[0309] When zooming from the wide-angle end state W to the telephoto end state T, the first lens group G1, the third lens group G3, and the fourth lens group G4 move toward the object, and the second lens group G2 moves so that the first lens group The distance between G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 d...

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Abstract

Providing a zoom lens system having a high zoom ratio being compact with high optical performance. The system includes, in order from an object along an optical axis, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, at least one lens group having positive refractive power, and an n-th lens group GN being disposed to the most image side. The n-th lens group GN with positive refractive power includes, in order from the object, a front group GNa and a rear group GNb having positive refractive power. Focusing on an object is carried out by moving the rear group GNb along the optical axis, and a given conditional expression is satisfied.

Description

[0001] The disclosures of the following prior applications are hereby incorporated by reference: [0002] Japanese Patent Application No. 2007-142228 filed May 29, 2007; and [0003] Japanese Patent Application No. 2008-113408 filed April 24, 2008. technical field [0004] The present invention relates to zoom lens systems, optical devices and methods for forming images of objects. Background technique [0005] For example, Japanese Patent Application Laid-Open No. 2003-241097 has proposed a zoom lens as a high zoom ratio zoom lens, which includes, in order from the object: a first lens group with positive refractive power; a second lens group; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, and zooming is performed by moving each lens group. [0006] But such a conventional zoom lens having a low zoom ratio cannot sufficiently satisfy the demand for a high zoom ratio. Furthermore, when focusing is performed b...

Claims

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Application Information

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IPC IPC(8): G02B15/16G02B13/18G03B5/00
Inventor 满木伸一
Owner NIKON CORP
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