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Zoom lens

A zoom lens and zoom lens technology, applied in the field of zoom lenses, can solve the problems of complex lens structure, lens addition, and difficulty in achieving low cost, and achieve the effects of simplified lens composition, good field curvature aberration, and low cost

Pending Publication Date: 2020-12-15
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

Zoom monitoring lens is often accompanied by an increase in the number of lenses and a complex lens structure while satisfying the imaging quality of short-range and long-range
[0003] In addition, the security field generally requires camera lenses to have the characteristics of infrared confocal performance without image distortion under high and low temperature. However, the zoom system takes into account high resolution, infrared confocal and high and low temperature performance, and it is difficult to achieve low cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0068] figure 1 and figure 2 The structure diagram of the wide-angle end and the structure diagram of the telephoto end of the zoom lens of this embodiment are respectively schematically shown. In this embodiment, the focal length of the zoom lens is 9mm-23mm, the compensation group includes three lenses, and the variable magnification group includes seven lenses, of which the second lens L2, the third lens L3, the sixth lens L6, and the seventh lens L7 and the tenth lens L10 are plastic aspherical lenses.

[0069] The following table 2 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, and Abbe number:

[0070]

[0071]

[0072] Table 2

[0073] Table 3 lists the aspheric coefficients of each aspheric lens in this embodiment, K is the quadric constant of the surface, a 4 , a 6 , a 8 , a 10 , a 12 are the aspheric coefficients of the fourth, sixth, eighth, tenth, an...

Embodiment approach 2

[0081] Figure 7 and Figure 8 The structure diagram of the wide-angle end and the structure diagram of the telephoto end of the zoom lens of this embodiment are respectively schematically shown. In this embodiment, the focal length of the zoom lens is 9mm-23mm, the compensation group includes three lenses, and the variable magnification group includes seven lenses, of which the second lens L2, the third lens L3, the sixth lens L6, and the seventh lens L7 and the tenth lens L10 are plastic aspherical lenses.

[0082] The following table 5 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, and Abbe number:

[0083] surface serial number surface type Radius of curvature thickness refractive index Abbe number 1 spherical 31.01 0.84 1.52 64 2 spherical 15.71 2.31 3 Aspherical -15.83 1.12 1.54 55 4 Aspherical 18.75 0.46 ...

Embodiment approach 3

[0093] Figure 13 and Figure 14 The structure diagram of the wide-angle end and the structure diagram of the telephoto end of the zoom lens of this embodiment are respectively schematically shown. In this embodiment, the focal length of the zoom lens is 9mm-23mm, the compensation group includes three lenses, and the variable magnification group includes seven lenses, of which the second lens L2, the third lens L3, the sixth lens L6, and the seventh lens L7 and the tenth lens L10 are plastic aspherical lenses.

[0094] The following Table 8 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, and Abbe number:

[0095]

[0096]

[0097] Table 8

[0098] Table 9 lists the aspheric coefficients of each aspheric lens in this embodiment, K is the quadric constant of the surface, a 4 , a 6 , a 8 , a 10 , a 12 are the aspheric coefficients of the fourth, sixth, eighth, tenth, a...

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Abstract

The invention relates to a zoom lens, which sequentially comprises a compensation lens group with negative focal power, a diaphragm and a zoom lens group with positive focal power along the directionfrom an object side to an image side, and is characterized in that the compensation lens group comprises two negative focal power lenses and a positive focal power lens or comprises three negative focal power lenses and a positive focal power lens. The zoom lens provided by the invention has the advantages of high resolution, infrared confocal property, athermalization, no out-of-focus in high andlow temperature environments, miniaturization and low cost.

Description

technical field [0001] The present invention relates to the technical field of optical system and device design, in particular to a zoom lens. Background technique [0002] In order to adapt to the diversity of monitoring places, camera monitoring needs to obtain clear images at the far and near ends, which requires the monitoring lens to have sufficient zooming effect. The zoom surveillance lens is often accompanied by an increase in the number of lenses and a complex lens structure while satisfying the imaging quality at close and long distances. [0003] In addition, the security field generally requires the camera lens to have infrared confocal performance without image distortion at high and low temperature. However, the zoom system takes into account high resolution, infrared confocal and high and low temperature performance, and it is difficult to achieve low cost. SUMMARY OF THE INVENTION [0004] The purpose of the present invention is to solve the above problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/14G02B13/14G02B13/18
CPCG02B15/1425G02B13/146G02B13/18
Inventor 蓝岚周小青
Owner 舜宇光学(中山)有限公司