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Zoom lens

A zoom lens and lens technology, applied in the field of zoom lenses, can solve the problems of inability to balance infrared performance and high and low temperature performance, inability to meet the requirements of image brightness, inability to balance large image area and small volume, etc., and achieve excellent resolution. And the effect of good assembly tolerance and reduced design cost

Pending Publication Date: 2022-03-25
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 lenses generally have the following disadvantages: small aperture, which cannot meet the brightness requirements of images in low-light environments; large image area and small size cannot be balanced, and cannot meet the space requirements of the lens; The rate is 2 million, which can no longer meet the needs of face recognition for high pixels; infrared performance and high and low temperature performance cannot be balanced, often by sacrificing high and low temperature performance to meet the requirements of day and night confocal, but this can no longer meet the needs of people in high and low temperature environments. Real-time requirements for face recognition
[0004] A zoom lens disclosed in Chinese patent CN102087404B mainly solves the problem of increasing the amount of incoming light and the zoom ratio while meeting the requirement of a compact volume, and cannot take into account the above-mentioned various performances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] see figure 1 and figure 2 , in this embodiment, the parameters of the zoom lens are as follows:

[0093] TTL=48.53mm;

[0094] FNO(WIDE)=1.60;

[0095] Wide-angle end focal length fw=13.1mm;

[0096] The focal length at the telephoto end is ft=21.0mm.

[0097] The relevant parameters of each lens of the zoom lens of this embodiment include surface type, radius of curvature R value, thickness d, refractive index ND of material and Abbe number VD, surf1 to surf27 represent each lens, cemented lens, Each surface of the diaphragm stop is shown in Table 2 below.

[0098]

[0099]

[0100] Table 2 In this embodiment, the aspherical lens of the zoom lens satisfies the following formula:

[0101]

[0102] Among them, Z represents the axial distance from the curved surface to the apex at a position perpendicular to the optical axis at a height h along the optical axis; c represents the curvature at the apex of the aspheric surface; k represents the conic coeffici...

Embodiment 2

[0113] see Figure 9 and Figure 10 , in this embodiment, the parameters of the zoom lens are as follows:

[0114] TTL=54.03mm;

[0115] FNO(WIDE)=1.65;

[0116] Focal length at wide-angle end fw=10.7mm;

[0117] The focal length at the telephoto end is ft=22.3mm.

[0118] The relevant parameters of each lens of the zoom lens of this embodiment include surface type, radius of curvature R value, thickness d, refractive index ND and Abbe number VD of the material, and surf 1 to surf 27 represent each piece of lens in the zoom lens, cemented Each surface of the lens and diaphragm stop is shown in Table 5 below.

[0119]

[0120]

[0121] Table 5 In this embodiment, the aspheric lens of the zoom lens satisfies the following formula:

[0122]

[0123] Among them, Z represents the axial distance from the curved surface to the apex at a position perpendicular to the optical axis at a height h along the optical axis; c represents the curvature at the apex of the aspheri...

Embodiment 3

[0134] see Figure 17 and Figure 18 , in this embodiment, the parameters of the zoom lens are as follows:

[0135] TTL=48.25mm;

[0136] FNO(WIDE)=1.8;

[0137] Focal length at wide-angle end fw=12.5mm;

[0138] The focal length at the telephoto end is ft=27.4mm.

[0139] The relevant parameters of each lens of the zoom lens of this embodiment include surface type, radius of curvature R value, thickness d, refractive index ND and Abbe number VD of the material, and surf 1 to surf 27 represent each piece of lens in the zoom lens, cemented Each surface of the lens and diaphragm stop is shown in Table 8 below.

[0140]

[0141]

[0142] Table 8

[0143] In this embodiment, the aspheric lens of the zoom lens satisfies the following formula:

[0144]

[0145] Among them, Z represents the axial distance from the curved surface to the apex at a position perpendicular to the optical axis at a height h along the optical axis; c represents the curvature at the apex of the...

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Abstract

The present invention relates to a zoom lens comprising, in order from an object side to an image side along an optical axis, a first lens group (G1) having a positive refractive power, a second lens group (G2) having a negative refractive power, a stop, a third lens group (G3) having a positive refractive power, and a fourth lens group (G4) having a positive refractive power, the second lens group (G2) and the fourth lens group (G4) move along an optical axis. Distance d12t from the last surface of the first lens group (G1) to the first surface of the second lens group (G2) when the zoom lens is at the telephoto end, and distance d12t from the last surface of the first lens group (G1) to the second lens group (G2) when the zoom lens is at the wide-angle end The distance d12w of the first surface and the focal length fw of the zoom lens at the wide-angle end satisfy the relational expression: 0.7 < = (d12t-d12w) / fw < = 1.2. The zoom lens realizes high imaging performance of wide field of view, small size, low cost and resolution of more than 4k.

Description

technical field [0001] The invention relates to the technical field of imaging optical systems, in particular to a zoom lens. Background technique [0002] The development of AI face recognition technology has put forward higher requirements for the aperture, image plane, resolution, infrared performance and high and low temperature performance of the camera lens. [0003] The existing lenses generally have the following disadvantages: small aperture, which cannot meet the brightness requirements of images in low-light environments; large image area and small size cannot be balanced, and cannot meet the space requirements of the lens; The rate is 2 million, which can no longer meet the needs of face recognition for high pixels; infrared performance and high and low temperature performance cannot be balanced, often by sacrificing high and low temperature performance to meet the requirements of day and night confocal, but this can no longer meet the needs of people in high and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/14
CPCG02B15/144113
Inventor 胡可欣梁伟朝陈礼光范家永
Owner 舜宇光学(中山)有限公司
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