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Zoom lens and imaging device

A zoom lens and lens technology, applied in the optical field, can solve the problems of reducing the scope of application of the zoom lens, difficulty in using the zoom lens, and small amount of light entering the zoom lens, so as to increase the scope of application, reduce aberration and coma, and increase imaging quality effect

Pending Publication Date: 2022-08-02
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 zoom lenses, it has played an important role in more and more fields such as monitoring and video communication. During the design process of zoom lenses, the size of the zoom group is small, which in turn leads to a small amount of light entering the zoom lens. Difficult to use zoom lenses in low light places, reducing the scope of application of the zoom lens

Method used

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  • Zoom lens and imaging device
  • Zoom lens and imaging device
  • Zoom lens and imaging device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A zoom lens, the zoom lens includes sequentially from the object plane side to the image plane side:

[0074] The first lens group G1 with positive power, the second lens group G2 with negative power, the third lens group G3 with positive power, the fourth lens group G4 with negative power, and the fifth lens group with positive power G5;

[0075] The zoom lens satisfies the following conditional formula:

[0076] FNow<1.5;

[0077] φG2 / TTL>0.17;

[0078] Wherein, FNOW is the aperture number of the zoom lens in the wide-angle state, φG2 is the outer diameter of the second lens group G2, and TTL is the total optical length of the zoom lens.

[0079] In this embodiment, through the limitation of the number of apertures, the amount of light entering the zoom lens under the condition of low light is increased, and at the same time, the outer diameter of the second lens group is increased, which further increases the amount of light entering the zoom lens, and reliably re...

Embodiment 2

[0123] A zoom lens, the zoom lens includes sequentially from the object plane side to the image plane side:

[0124] 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 with negative refractive power, the The fifth lens group G5 and the auxiliary component G6.

[0125] The first lens group G1 includes sequentially from the object plane side to the image plane side:

[0126] The first lens L1 with negative refractive power, the second lens L2 with positive refractive power, the third lens L3 with positive refractive power, the first lens L1 and the second lens L2 are cemented together.

[0127] The second lens group G2 includes sequentially from the object plane side to the image plane side:

[0128] The fourth lens L4 with negative refractive power, the fifth lens L5 with negative refractive power, the sixth lens L6 ...

Embodiment 3

[0159] A zoom lens, the zoom lens includes sequentially from the object plane side to the image plane side:

[0160] 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 with negative refractive power, the The fifth lens group G5 and the auxiliary component G6.

[0161] The first lens group G1 includes sequentially from the object plane side to the image plane side:

[0162] The first lens L1 with negative refractive power, the second lens L2 with positive refractive power, the third lens L3 with positive refractive power, the first lens L1 and the second lens L2 are cemented together.

[0163] The second lens group G2 includes sequentially from the object plane side to the image plane side:

[0164] The fourth lens L4 with negative refractive power, the fifth lens L5 with negative refractive power, the sixth lens L6 ...

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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 third lens group with positive focal power, a fourth lens group with negative focal power and a fifth lens group with positive focal power from the object plane side to the image plane side. The zoom lens satisfies the following conditional expressions: FNOw is less than 1.5; [phi] G2 / TTL > 0.17; wherein FNOw is the number of apertures of the zoom lens in a wide-angle state, phi G2 is the outer diameter of the second lens group, and TTL is the total optical length of the zoom lens. Through the limitation of the number of the apertures, the light incoming amount of the zoom lens under the condition of darker light is increased, the outer diameter of the second lens group is increased, the light incoming amount of the zoom lens is further increased, the number of the apertures of the zoom lens is reliably reduced, and the application range of the zoom lens is increased.

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] A zoom lens is a lens that can change the focal length within a certain range to obtain different wide and narrow field angles, images of different sizes 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. In the design process of the zoom lens, the zoom group is small, which in turn leads to a small amount of light entering the zoom lens. Zoom lenses are difficult to use in dimly lit places, reducing the scope of application of zoom lenses. SUMMARY OF THE INVENTION [0004] The present invention will solve the existing technical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/14
CPCG02B15/145121
Inventor 江秉儒马培培江中昊唐家骏
Owner JIAXING ZHONGRUN OPTICAL TECH