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Zoom lenses and optics

A technology of zoom lens and focal length, applied in the field of zoom lens, can solve problems such as difficult to realize, difficult to realize large aperture zoom lens, increasing lens aberration, etc.

Active Publication Date: 2021-07-02
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a large-aperture zoom lens, further widening the angle of view while maintaining the aperture ratio is difficult because lens aberrations increase
For example, it is difficult to achieve a large-aperture zoom lens with a half-field angle of about 45 degrees at the wide-angle end

Method used

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  • Zoom lenses and optics
  • Zoom lenses and optics
  • Zoom lenses and optics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0085] Hereinafter, a zoom lens ZL according to an example of the present embodiment will be described with reference to the drawings. figure 1 , image 3 , Figure 5 , Figure 7 , Figure 9 , Figure 11 It is a cross-sectional view showing the structure and distribution of refractive power of the zoom lenses ZL {ZL(1)-ZL(6)} of the first lens group to the sixth embodiment. In the lower part of the cross-sectional views of the zoom lenses ZL (1) to ZL (6), arrows show zooming from the wide-angle end state (w) to the telephoto end state (t) via the middle position (m) (zooming operation) The movement direction of each lens group along the optical axis. In this zoom lens ZL, the first lens group G1 is configured to move toward the image plane side when zooming (zooming operation) from the wide-angle end state (w) to the telephoto end state (t) via the intermediate position (m) .

[0086] In addition, the third lens group G3 is used as a focus lens, and in the figure, the ...

no. 1 Embodiment

[0099] use figure 1 , figure 2 And Table 1 describes the first embodiment. figure 1 It is a diagram showing the lens configuration of the zoom lens according to the first example of the present embodiment. The zoom lens ZL(1) of the first embodiment is composed of the first lens group G1 having negative refractive power, the second lens group G2 having positive refractive power, and the second lens group G2 having negative refractive power, which are arranged in order from the object side. The 3rd lens group G3 and the 4th lens group G4 with positive refractive power constitute. The sign (+) or (-) attached to each lens group number represents the refractive power of each lens group, and this is the same in all the following examples. An aperture stop S is provided between the first lens group G1 and the second lens group G2, and a glare cut stop FC is provided on the most image side, and an image plane I is provided on the image plane side of the fourth lens group G4. A ...

no. 2 Embodiment

[0128] use image 3 , Figure 4 and Table 2 to describe the second embodiment. image 3 It is a figure showing the lens structure of the zoom lens of the 2nd Example of this embodiment. The zoom lens ZL(2) of the second embodiment consists of the first lens group G1 having negative refractive power, the second lens group G2 having positive refractive power, and the second lens group G2 having negative refractive power, which are arranged in order from the object side. The 3rd lens group G3 and the 4th lens group G4 with positive refractive power constitute. An aperture stop S is provided between the first lens group G1 and the second lens group G2, and a glare cut stop FC is provided on the most image side, and an image plane I is provided on the image plane side of the fourth lens group G4. A filter FL and a cover glass CG (cover glass for the image plane I) are provided closer to the image plane I than the fourth lens group G4 on the image side. The filter FL is composed...

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Abstract

A kind of zoom lens, is constituted as having the 1st lens group (G1) with negative refractive power arranged in order from the object side along optical axis, the 2nd lens group (G2) with positive refractive power, has negative refractive power The third lens group (G3) with the refractive power and the fourth lens group (G4) with positive refractive power, and satisfy the following conditional formula: 1.60<(‑f1) / fw<2.50 Among them, f1: The focal length of the first lens group, fw: the focal length of the zoom lens as a whole in the wide-angle end state.

Description

technical field [0001] The present invention relates to a zoom lens, an optical device using the zoom lens, and a manufacturing method of the zoom lens. Background technique [0002] Large-diameter zoom lenses have been proposed as zoom lenses used in photographing optical systems of digital cameras, film cameras, video cameras, and the like (for example, refer to Patent Document 1). In such a large-aperture zoom lens, further widening the angle of view while maintaining the aperture ratio is difficult because lens aberrations increase. For example, it is difficult to realize a large-aperture zoom lens with a half-field angle of about 45 degrees at the wide-angle end. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2014-41222 Contents of the invention [0006] The zoom lens of the present invention includes a first lens group with negative refractive power, a second lens group with positive refractive po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/20G02B13/18
CPCG02B13/04G02B27/0025G02B27/646G02B15/144511G02B13/02G02B15/177G02B15/20
Inventor 古井田启吾
Owner NIKON CORP