High-definition zoom lens and security camera device

A zoom lens, high-definition technology, applied in the optical field, can solve the problems of true 4K, staying in the field of small magnification, etc., to increase the clarity, reduce the processing cost, and achieve the effect of miniaturization

Pending Publication Date: 2020-05-05
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, when the security lens satisfies a large zoom ratio, due to various reasons, such as the diffraction limit at the telephoto end, the structure of the lens group, etc., it is often impossible to achieve true 4K resolution. Stay in the field of small magnification

Method used

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  • High-definition zoom lens and security camera device
  • High-definition zoom lens and security camera device
  • High-definition zoom lens and security camera device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment one: if figure 1 As shown, a high-definition zoom lens, from the object side to the image side, includes:

[0040] The first fixed lens group G1 with positive refractive power, the zoom lens group G2 with negative refractive power, the stop STP, the second fixed lens group G3 with positive refractive power, the focusing lens group G4 with negative refractive power, and the positive refractive power The third fixed lens group G5;

[0041] The amount of movement of the zoom lens group G2 satisfies the following conditional expression:

[0042] ΔB1 / TTL∈(0.15, 0.35)...(1);

[0043] Among them: ΔB1 is the relative displacement between the wide-angle end position and the telephoto end position of the zoom lens group G2, and TTL is the total length of the high-definition zoom lens.

[0044] The focusing lens group G4 moves along the optical axis to compensate for the moving zoom lens group G2.

[0045] In this embodiment, the resolution of the zoom lens is incre...

Embodiment 2

[0058] Embodiment two: if figure 1 As shown, a high-definition zoom lens, the difference between this embodiment and Embodiment 1 lies in the relationship between the number of lenses in each lens group.

[0059] Based on the first embodiment, the number of lenses in the second fixed lens group G3 is greater than the number of lenses in the first fixed lens group G1 and the number of lenses in the third fixed lens group G5.

[0060] When the number of lenses in the second fixed lens group G3 is large, the volume of the second fixed lens group G3 also increases correspondingly, and the overall center of gravity of the lens can also be located in the second fixed lens group G3, which increases the stability of the lens; at the same time, Since the second fixed lens group G3 can simultaneously adjust the parameters of the wide-angle end and the telephoto end, and the adjustment efficiency is high, therefore, by increasing the number of the second fixed lens group G3, the remainin...

Embodiment 3

[0065] Embodiment three: as figure 1 As shown, a high-definition zoom lens, from the object side to the image side, includes:

[0066] The first fixed lens group G1 with positive refractive power, the zoom lens group G2 with negative refractive power, the diaphragm STP, the second fixed lens group G3 with positive refractive power, the focusing lens group G4 with negative refractive power, and the positive refractive power The third fixed lens group G5 and auxiliary component G6.

[0067] The first fixed lens group G1 includes: a first lens L1 with negative power, a second lens L2 with positive power, and a third lens L3 with positive power; the first lens L1 and the second lens L2 are cemented.

[0068] The zoom lens group G2 includes: a fourth lens L4 with negative power, a fifth lens L5 with negative power, a sixth lens L6 with positive power, and a seventh lens L7 with negative power; The fifth lens L5 and the sixth lens L6 are cemented.

[0069] The second fixed lens g...

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Abstract

The invention discloses a high-definition zoom lens and a security camera device, and relates to the technical field of optics. The zoom lens sequentially comprises a first fixed lens group with positive focal power, a zoom lens group with negative focal power, a diaphragm, a second fixed lens group with positive focal power, a focusing lens group with negative focal power and a third fixed lens group with positive focal power from an object plane side to an image plane side, the amount of movement of the zoom lens group satisfies the following conditional expressions: [delta]B1 / TTL belongs to(0.15, 0.35), wherein [delta]B1 is the relative displacement of the zoom lens group at the wide-angle end and the telescopic end, and TTL is the total length of the high-definition zoom lens; and thefocusing lens group moves in the optical axis direction and is used for compensating the moving zoom lens group. The change range of the relative displacement of the zoom lens group is large, that is, the zoom range of the high-definition zoom lens is large, and the application range of the high-definition zoom lens is wide.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a high-definition zoom lens and a security camera device. Background technique [0002] In response to the national ultra-high-definition video industry development action plan, in accordance with the overall technical route of "4K first, taking into account 8K", the security industry will also fully enter the ultra-high-definition era in the future. In this context, there has been a vacancy in the high-end high-magnification zoom field of traditional security lenses in the past. [0003] In the past, when the security lens satisfies a large zoom ratio, due to various reasons, such as the diffraction limit at the telephoto end, the structure of the lens group, etc., it is often impossible to achieve true 4K resolution. Stay in the field of small magnification. Contents of the invention [0004] The present invention will solve the existing technical problems and provide a hi...

Claims

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Application Information

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IPC IPC(8): G02B15/173G02B15/20
CPCG02B15/173G02B15/20
Inventor 张平华张思慎厉冰川盛亚茗尚洁阳张杰
Owner JIAXING ZHONGRUN OPTICAL TECH
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