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
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But such a conventional zoom lens with a low zoom rat

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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 Embodiment

[0093]

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

[0095] The zoom lens system according to Example 1 is composed of the following parts 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 with positive refractive power; and a fourth lens group with positive refractive power provided 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 t...

Example Embodiment

[0205]

[0206] 4 is a cross-sectional view showing the lens layout of the zoom lens system according to Example 2 together with the zoom trajectory 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: a first lens group G1 with positive refractive power, a second lens group G2 with negative 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 decreases, and the distance between the third...

Example Embodiment

[0306]

[0307] 7 is a cross-sectional view showing the lens layout of a zoom lens system according to Example 3 together with the zoom trajectory 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: a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, and a The third lens group G3 having refractive power, and the fourth lens group having 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 decreases, and the distance between t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G02B15/16G02B13/18G03B5/00
Inventor 满木伸一
Owner NIKON CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap