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Zoom lens

A zoom lens and lens technology, applied in the field of zoom lenses, can solve the problems of poor imaging performance of zoom lenses, and achieve the effects of large aperture, uniform illumination, and uniform image quality

Pending Publication Date: 2021-02-09
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

[0004] The purpose of the present invention is to solve the above problems, provide a zoom lens to solve the problem of poor imaging performance of the zoom lens

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0055] Such as figure 1 As shown, according to an embodiment of the present invention, a zoom lens of the present invention includes: the first lens group G1 with positive refractive power arranged in sequence along the optical axis from the object side to the image side, and the first lens group G1 with negative refractive power The second lens group G2, the diaphragm, the third lens group G3 with positive refractive power, and the fourth lens group G4 with positive refractive power.

[0056] In this embodiment, the first lens group G1 and the third lens group G3 are fixed groups, the second lens group G2 is a zoom group that can move along the optical axis, and the fourth lens group G4 is a focus group that can move along the optical axis . In this embodiment, the distance between the second lens group G2 and the third lens group G3 gradually decreases from the wide-angle end to the telephoto end, and the second lens group G2 and the third lens group G3 satisfy:

[0057] 9...

Embodiment approach 1

[0092] The zoom lens according to the present invention has 18 lenses in total, including multiple cemented lens groups, plus the stop surface Stop, a total of 32 surfaces. The 32 surfaces are arranged sequentially according to the structural order of the present invention. For the convenience of description, the 32 surfaces are numbered sur1 to sur32, wherein the stop surface is replaced by Stop sur13, and the cemented surface in the cemented lens group is represented by a number. The imaging surface is represented as Image.

[0093] As mentioned above, in this embodiment, the specific parameters of the zoom lens of the present invention are shown in Table 2.

[0094] Table 2 is the parameter list of Embodiment 1:

[0095]

[0096]

[0097] Table 2

[0098] In this embodiment, the parameters of the zoom lens in this embodiment are shown in Table 3 below:

[0099] wide-angle end middle telephoto end focal length 19.4 38.8 77.2 FNO. 1.2 1...

Embodiment approach 2

[0106] The zoom lens according to the present invention has 18 lenses in total, including multiple cemented lens groups, plus the stop surface Stop, a total of 32 surfaces. The 32 surfaces are arranged sequentially according to the structural order of the present invention. For the convenience of description, the 32 surfaces are numbered sur1 to sur32, wherein the stop surface is replaced by Stop sur13, and the cemented surface in the cemented lens group is represented by a number. The imaging surface is represented as Image.

[0107] As mentioned above, in this embodiment, specific parameters of the zoom lens of the present invention are shown in Table 5.

[0108] Table 5 is the second parameter table of the embodiment:

[0109]

[0110]

[0111]

[0112] table 5

[0113] In this embodiment, the parameters of the zoom lens in this embodiment are shown in Table 6 below:

[0114] wide-angle end middle telephoto end focal length 19.35 38.7 77....

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Abstract

The invention relates to a zoom lens. The zoom lens comprises a first lens group with positive focal power, a second lens group with negative focal power, a diaphragm, a third lens group with positivefocal power and a fourth lens group with positive focal power, which are sequentially arranged from an object side to an image side; the first lens group and the third lens group are fixed groups, the second lens group is a zoom group capable of moving along an optical axis, and the fourth lens group is a focusing group capable of moving along the optical axis; the second lens group and the thirdlens group satisfy 9.5 <= (d1 - d2) / (fT / fW) <= 13, and d1 is the distance from the image side surface of the last lens of the second lens group to the object side surface of the first lens of the third lens group at the wide-angle end of the zoom lens; d2 is the distance from the image side surface of the last lens of the second lens group to the object side surface of the first lens of the thirdlens group at the telescopic end of the zoom lens; and fT is the focal length value of the telescopic end, and fW is the focal length value of the wide-angle end. The imaging quality is high.

Description

technical field [0001] The invention relates to the field of optical imaging, in particular to a zoom lens. Background technique [0002] The zoom lens is more and more popular in the security monitoring market because of its variable focal length, which can be applied to a variety of monitoring scenarios. [0003] The existing constant aperture zoom heads on the market still have some performance defects that limit their application scenarios. For example, the angle of the wide-angle end is not large enough, and the monitoring range is limited; the aperture is small, which cannot meet the monitoring needs of low-light environments; the resolution is insufficient, the resolution is low, the zoom range is small, and the monitoring range is limited. Contents of the invention [0004] The purpose of the present invention is to solve the above problems, and provide a zoom lens to solve the problem of poor imaging performance of the zoom lens. [0005] To achieve the above ob...

Claims

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Application Information

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IPC IPC(8): G02B15/14G02B15/20
CPCG02B15/20G02B15/144113
Inventor 周静
Owner 舜宇光学(中山)有限公司
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