Zoom lens

A zoom lens and lens technology, applied in the field of zoom lenses, can solve the problems of increasing the number of lenses, the difficulty of the zoom optical system to take into account the high-resolution images without distortion and low cost, and the complex lens structure, etc. Market application prospects, the effect of eliminating back focus drift

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 short-range and long-range imaging quality
In addition,

Method used

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  • Zoom lens
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0053] figure 1 and figure 2 Schematic representations of the structures of the wide-angle end and the telephoto end of the zoom lens in this embodiment are shown respectively. to combine figure 1 and figure 2 As shown, in this embodiment, the first lens group a of the zoom lens includes three lenses, and the second lens group b includes five lenses, wherein the seventh lens 7 and the eighth lens 8 form a cemented lens group.

[0054] The following table 2 lists the relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0055] Surface serial number surface type radius of curvature thickness Refractive index Abbe number 1 sphere Infinity 0.61 1.71 50.3 2 sphere 7.638 4.46 3 Aspherical -15.372 1.16 1.53 56.1 4 Aspherical 13.285 0.15 5 Aspherical 11.645 2.15 1.64 23.5 6 Aspherical -360.125 ...

Embodiment approach 2

[0062] Figure 7 and Figure 8 Schematic representations of the structures of the wide-angle end and the telephoto end of the zoom lens in this embodiment are shown respectively. to combine Figure 7 and Figure 8 As shown, in this embodiment, the first lens group a of the zoom lens includes three lenses, and the second lens group b includes five lenses, wherein the seventh lens 7 and the eighth lens 8 form a cemented lens group.

[0063] The following table 4 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0064]

[0065]

[0066] Table 4

[0067] What table 5 listed is the aspheric coefficient of each aspherical lens in the present embodiment:

[0068] Surface serial number k a 4

a 6

a 8

a 10

a 12

3 -1.0 6.905E-04 -5.568E-05 1.605E-06 -2.725E-08 1.916E-010 4 -1.0 5.425E-04 -3.712E-05 -2.705E-08 4.078E...

Embodiment approach 3

[0072] Figure 13 and Figure 14 Schematic representations of the structures of the wide-angle end and the telephoto end of the zoom lens in this embodiment are shown respectively. to combine Figure 13 and Figure 14 As shown, in this embodiment, the first lens group a of the zoom lens includes three lenses, and the second lens group b includes five lenses, wherein the seventh lens 7 and the eighth lens 8 form a cemented lens group.

[0073] The following table 6 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0074]

[0075]

[0076] Table 6

[0077] What table 7 lists is the aspheric coefficient of each aspheric lens in the present embodiment:

[0078] Surface serial number k a 4

a 6

a 8

a 10

a 12

3 -1.0 9.217E-05 -3.074E-05 1.396E-06 -2.355E-08 1.306E-010 4 -1.0 -3.489E-05 -1.819E-05 5.158E-07 -3.54...

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PUM

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Abstract

The invention relates to a zoom lens, which sequentially comprises a compensation group (a) with negative focal power, a diaphragm and a zoom group (b) with positive focal power along the direction from an object side to an image side, wherein the focal length of the compensation group (a) is Fa, the focal length of the zoom group (b) is Fb, and Fa/Fb is greater than or equal to -0.98 and less than or equal to -0.79. The zoom lens provided by the invention has the characteristics of high pixel, low cost, athermalization and infrared confocal property.

Description

technical field [0001] The 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 surveillance sites, the camera needs to obtain clear imaging at both ends of the far and near, which requires the surveillance lens to have sufficient zoom effect. Zoom monitoring lens is often accompanied by an increase in the number of lenses and a complex lens structure while satisfying the quality of short-range and long-range imaging. In addition, the security field generally requires camera lenses to have the characteristics of infrared confocal performance and image distortion under high and low temperature. Low cost characteristics. Contents of the invention [0003] The object of the present invention is to solve the above problems and provide a zoom lens. [0004] In order to achieve the above object, the present invention provides a zoom lens, along the direct...

Claims

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Application Information

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IPC IPC(8): G02B15/14G02B13/14G02B13/18
CPCG02B13/146G02B13/18G02B15/1425
Inventor 赖景辉蓝岚杨学坤
Owner 舜宇光学(中山)有限公司
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