Zoom lens and imaging device

A zoom lens and lens technology, applied in the field of optics, can solve the problems of zoom lens volume increase, achieve the effects of improving chromatic aberration and astigmatism, reducing excessive volume, and increasing imaging quality

Pending Publication Date: 2022-07-29
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the increasing popularity of the zoom lens, it has played an important role in more and more fields such as monitoring and video communication. However, in order to make the zoom lens have a higher resolution, it is usually achieved by increasing the number of lenses in the zoom lens. Increase the resolution of the zoom lens, which also results in an increase in the size of the zoom lens

Method used

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  • Zoom lens and imaging device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] like figure 1 , Figure 5 and Figure 9 As shown, a zoom lens, the zoom lens includes sequentially from the object plane side to the image plane side:

[0063] The first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the diaphragm STO, the third lens group G3 with positive refractive power, the fourth lens group G4, and the fifth lens group G5 with positive refractive power .

[0064] The second lens group G2, the fourth lens group G4, and the fifth lens group G5 move in the direction of the main optical axis of the zoom lens.

[0065] The fourth lens group G4 includes one lens with positive refractive power and one lens with negative refractive power in sequence from the object surface side to the image surface side.

[0066] The zoom lens satisfies the following conditional formula:

[0067] ft>175mm;

[0068] TTL<135mm.

[0069] Wherein, ft is the focal length of the zoom lens in the telephoto state, and ...

Embodiment 2

[0102] like Figure 1 to Figure 4 As shown, a zoom lens, the zoom lens is composed of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a diaphragm STO, a positive refractive power The third lens group G3, the fourth lens group G4, the fifth lens group G5 with positive refractive power and the auxiliary component G6 are composed.

[0103] The second lens group G2, the fourth lens group G4, and the fifth lens group G5 move in the direction of the main optical axis of the zoom lens.

[0104] The first lens group G1 includes sequentially from the object plane side to the image plane side:

[0105] The first lens L1 with negative refractive power, the second lens L2 with positive refractive power, the third lens L3 with positive refractive power, and the fourth lens L4 with positive refractive power.

[0106] The second lens group G2 includes sequentially from the object plane side to the image plane side:

[0107] The ...

Embodiment 3

[0134] like Figure 5 to Figure 8 As shown, a zoom lens, the zoom lens includes sequentially from the object plane side to the image plane side:

[0135] The first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the diaphragm STO, the third lens group G3 with positive refractive power, the fourth lens group G4, and the fifth lens group G5 with positive refractive power and auxiliary component G6.

[0136] The second lens group G2, the fourth lens group G4, and the fifth lens group G5 move in the direction of the main optical axis of the zoom lens.

[0137] The first lens group G1 includes sequentially from the object plane side to the image plane side:

[0138] The first lens L1 with negative refractive power, the second lens L2 with positive refractive power, the third lens L3 with positive refractive power, and the fourth lens L4 with positive refractive power.

[0139] The second lens group G2 includes sequentially f...

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PUM

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Abstract

The invention relates to the field of optics, in particular to a zoom lens and an imaging device. The zoom lens is sequentially composed of a first lens group with positive focal power, a second lens group with negative focal power, a diaphragm, a third lens group with positive focal power, a fourth lens group and a fifth lens group with positive focal power from an object plane side to an image plane side. The second lens group, the fourth lens group and the fifth lens group move in the main optical axis direction of the zoom lens; the fourth lens group sequentially comprises a positive focal power lens and a negative focal power lens from the object plane side to the image plane side; the zoom lens satisfies the following conditional expressions: ft is greater than 175 mm; tTL is less than 135 mm; wherein ft is the focal length of the zoom lens in the telescopic state, and TTL is the total optical length of the zoom lens. Through the limitation of the structure and the parameters, the number of the lenses in the zoom lens is small under the condition that the resolving power basis is realized, and the functions of small size and ultra-long focus of the zoom lens are realized.

Description

technical field [0001] The invention relates to the field of optics, in particular to a zoom lens and an imaging device. Background technique [0002] The zoom lens is a lens that can change the focal length within a certain range, so as to obtain different wide and narrow field angles, different sizes of images and different scene ranges. The zoom lens can change the shooting range by changing the focal length without changing the shooting distance. , so it is very beneficial to the composition of the picture. [0003] With the increasing popularity of the zoom lens, it has played an important role in more and more fields such as surveillance and video. However, in order to make the zoom lens have a higher resolution, the number of lenses in the zoom lens is usually increased. The resolution of the zoom lens is increased, which also results in an increase in the volume of the zoom lens. SUMMARY OF THE INVENTION [0004] The present invention will solve the existing tech...

Claims

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Application Information

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IPC IPC(8): G02B15/14
CPCG02B15/145129G02B15/1451
Inventor 江秉儒徐云斌詹康盛张伟
Owner JIAXING ZHONGRUN OPTICAL TECH
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