Zoom lens

A zoom lens and zoom lens technology, applied in the field of zoom lenses, can solve problems such as limited use scenarios, low resolution, and performance defects, and achieve the effects of wide field of view, high zoom ratio, and less deformation

Pending Publication Date: 2022-02-25
舜宇光学(中山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing high-magnification zoom lenses on the market still have some performance defects that limit their usage scenarios
For example, the resolution is insufficient and the resolution is low; the angle at the wide-angle end is not large enough, and the shooting range is limited; the magnification at the telephoto end is not large enough, and the magnification effect is insufficient; limited

Method used

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  • Zoom lens
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this embodiment, the second lens group G2 includes one lens with positive refractive power and three lenses with negative refractive power, and the sixth lens group G6 includes two lenses with positive refractive power and one lens with negative refractive power. power of the lens. The zoom lens also includes a glass aspheric lens. Each parameter of the zoom lens of the present embodiment is as follows:

[0064] TTL=120.01mm;

[0065] FNO(WIDE)=1.87;

[0066] Wide-angle end focal length fw=3.463mm;

[0067] The focal length at the telephoto end is ft=63.174mm.

[0068] The parameters of each lens of the zoom lens of the present embodiment include: surface type, radius of curvature (R value), thickness d, refractive index Nd of material, Abbe number Vd, as shown in Table 2 below:

[0069]

[0070]

[0071] Table 2

[0072] The aspheric coefficients of each aspherical lens of the zoom lens of the present embodiment include: the quadric constant K of the sur...

Embodiment 2

[0080] In this embodiment, the second lens group G2 includes one lens with positive refractive power and three lenses with negative refractive power, and the sixth lens group G6 includes two lenses with positive refractive power and one lens with negative refractive power. power of the lens. The zoom lens also includes a glass aspheric lens. Each parameter of the zoom lens of the present embodiment is as follows:

[0081] TTL=120.01mm;

[0082] FNO(WIDE)=1.88;

[0083] Focal length at wide-angle end fw=3.464mm;

[0084] The focal length at the telephoto end is ft=63.704mm.

[0085] The parameters of each lens of the zoom lens of the present embodiment include: surface type, radius of curvature (R value), thickness d, refractive index Nd of material, Abbe number Vd, as shown in Table 5 below:

[0086]

[0087]

[0088] table 5

[0089] The aspheric coefficients of each aspherical lens of the zoom lens of the present embodiment include: the quadric constant K of the ...

Embodiment 3

[0097] In this embodiment, the second lens group G2 includes two lenses with positive refractive power and two lenses with negative refractive power, and the sixth lens group G6 includes two lenses with positive refractive power and one lens with negative refractive power. power of the lens. The zoom lens also includes a plastic aspheric lens. Each parameter of the zoom lens of the present embodiment is as follows:

[0098] TTL=120.02mm;

[0099] FNO(WIDE)=1.88;

[0100] Wide-angle end focal length fw=3.470mm;

[0101] The focal length at the telephoto end is ft=64.344mm.

[0102] The parameters of each lens of the zoom lens of the present embodiment include: surface type, radius of curvature (R value), thickness d, refractive index Nd of material, Abbe number Vd, as shown in Table 8 below:

[0103]

[0104]

[0105] Table 8

[0106] The aspheric coefficients of each aspherical lens of the zoom lens of the present embodiment include: the quadric constant K of the s...

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Abstract

The invention relates to a zoom lens. The zoom lens comprises a first fixed lens group (G1) with positive focal power, a first zoom lens group (G2) with negative focal power, a diaphragm (STO), a second fixed lens group (G3) with positive focal power, a second zoom lens group (G4) with positive focal power, a third fixed lens group (G5) with negative focal power and a focusing lens group (G6) with positive focal power in sequence from an object side to an image side along an optical axis. According to the zoom lens, large zoom ratio, high resolution and low distortion can be taken into consideration, the focusing object distance range is wide, the zoom ratio change range of the zoom lens can reach 20X or above from the wide-angle end to the long-focus end, and meanwhile the absolute value of distortion in the whole zoom process is smaller than 5%.

Description

technical field [0001] The invention relates to the technical field of imaging lenses, in particular to a zoom lens. Background technique [0002] In recent years, with the development of chip technologies such as CCD or CMOS, and the improvement of people's requirements for video conferencing image quality, the imaging quality requirements for matching optical systems are also getting higher and higher. In order to meet this trend, optical lenses mounted on video conferencing products are further required to have high resolution, large magnification, and low distortion. [0003] The existing high-magnification zoom lenses on the market still have some performance defects that limit their application scenarios. For example, the resolution is insufficient and the resolution is low; the angle at the wide-angle end is not large enough, and the shooting range is limited; the magnification at the telephoto end is not large enough, and the magnification effect is insufficient; l...

Claims

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Application Information

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IPC IPC(8): G02B15/14
CPCG02B15/1461
Inventor 周静周小青梁伟朝
Owner 舜宇光学(中山)有限公司
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