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Lens

A lens and lens technology, applied in the field of lenses, can solve the problems of large volume and small aperture, and achieve the effects of high image resolution, increased target surface size and aperture, and good image quality.

Active Publication Date: 2019-08-30
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present invention provides a lens to solve the problems of the prior art that the target size of the lens is small, the aperture is small, and the volume is large

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The focal length of the lens is 13-24.39 mm, the aperture Fno is 1.42, and the total length TTL of the lens is 164.09 mm. The data such as the radius of curvature, center thickness, refractive index nd, and Abbe number Vd of each lens are shown in Table 1:

[0081]

[0082]

[0083]

[0084] Table 1

[0085] When D5, D12, D26, and D31 in Table 1 are at wide-angle end W and telephoto end T:

[0086] D5 D12 D26 D31 W 1.06 16.12 3.67 2.54 T 17.05 0.12 1.80 4.42

[0087] In Table 1, the values ​​of D32, D33, D34, and D35 when arriving at image plane 2 along the AOB path and arriving at image plane 1 along the AOC path are respectively:

[0088] D32 D33 D34 D35 AOB path 24.95 3.82 0.55 3.16 AOC path 25.5 7.03 0 0

[0089] Among them, D32 represents the distance that light passes through the prism group along the AOB path or AOC path, and D34 being 0 means that the component is not placed.

[0...

Embodiment 2

[0097] The focal length of the lens is 13-24.41 mm, the aperture Fno is 1.45, and the total length TTL of the lens is 164.75 mm. The data such as the radius of curvature, central thickness, refractive index nd, and Abbe number Vd of each lens are shown in Table 2:

[0098]

[0099]

[0100]

[0101] Table 2

[0102] In Table 2, when D5, D12, D26, and D31 are at the wide-angle end W and the telephoto end T:

[0103] D5 D12 D13 D26 D31 1.02 18.50 26.73 3.58 2.47 17.93 0.10 28.23 1.57 4.49

[0104] The value change of the position D13 of the vignetting diaphragm indicates that the vignetting diaphragm moves along the optical axis within a small range, so as to eliminate the light that is not conducive to imaging to the greatest extent.

[0105] In Table 2, the values ​​of D32, D33, D34, and D35 when arriving at image plane 2 along the AOB path and arriving at image plane 1 along the AOC path are respectively:

[0106] D32 D...

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Abstract

The invention discloses a lens. The lens comprises a first lens group, a second lens group, a third lens group, a fourth lens group and an imaging surface, which are sequentially arranged from an object side to an image side; the positions of the first lens group and the third lens group are fixed, and the second lens group and the fourth lens group can move along an optical axis; the lens group satisfies the following conditions: |f3 / f short focus| is greater than or equal to 10 and is less than or equal to 17, and (TTL-D flat plate) / f long focus is greater than 4 and is less than 7, whereinthe f3 represents a focal length of the third lens group, the f short focus represents a system focal length of the lens in a short focus state, and the f long focus represents the system focal lengthof the lens in a long focus state, the TTL represents a total optical length of the lens, and the D flat plate represents the distance between the fourth lens group and the imaging surface. Accordingto the lens provided by the embodiment of the invention, the size and the aperture of a target surface of the lens are increased, the image resolution is relatively high, the image quality obtained in a low illumination scene is better, and the total optical length of the lens is reduced.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a lens. Background technique [0002] With the development of society, people's awareness of safety precautions has been continuously improved, and the security monitoring industry has also developed rapidly, and the role of monitoring is becoming more and more important. Zoom lenses have been actually designed and used in the last century. With the development of lens design technology, the application occasions of zoom lenses are gradually increasing. Today, zoom lenses have been widely used in civilian products, security monitoring and other fields. However, because the imaging quality of the zoom lens is worse than that of the ordinary fixed focal length lens, the penetration rate of the zoom lens is not high. Moreover, most of the zoom lenses currently on the market are simple in structure and small in target size, resulting in low resolution of the collected image...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/163G02B15/20
CPCG02B15/163G02B15/20
Inventor 林法官刘凯丁洪兴
Owner ZHEJIANG DAHUA TECH CO LTD
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