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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 insufficient shooting effect, poor picture clarity and sharpness, etc., to increase the shooting effect, reduce the excessive thickness of the lens, and achieve the effect of miniaturization

Active Publication Date: 2021-11-02
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]At present, security zoom lenses on the market generally have insufficient shooting effects at night, that is, in low-light environments. The clarity and sharpness of the picture are far inferior to the daytime shooting effect, so the market demand for low-light shooting is becoming stronger and stronger, and the excellent low-light effect must require the lens to have the largest possible aperture number

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Such as figure 1 As shown, a zoom lens, the zoom lens sequentially includes from the object plane side to the image plane side:

[0084] The first lens group G1 of positive refractive power, the second lens group G2 of negative refractive power, the third lens group G3 of negative refractive power, the stop STO and the fourth lens group G4 of positive refractive power.

[0085] The second lens group G2 and the third lens group G3 move along the main optical axis direction of the zoom lens, and the second lens group G2 and the third lens group G3 move in the same direction.

[0086] The first lens group G1 sequentially includes from the object plane side to the image plane side:

[0087] The first lens group G1 with negative refractive power, the second lens group G2 with positive refractive power, and the third lens group G3 with positive refractive power.

[0088] The second lens group G2 sequentially includes from the object plane side to the image plane side:

[0...

Embodiment 2

[0128] Such asfigure 1 As shown, a zoom lens, the zoom lens sequentially includes from the object plane side to the image plane side:

[0129] The first lens group G1 of positive refractive power, the second lens group G2 of negative refractive power, the third lens group G3 of negative refractive power, the stop STO and the fourth lens group G4 of positive refractive power.

[0130] The second lens group G2 and the third lens group G3 move along the main optical axis direction of the zoom lens, and the second lens group G2 and the third lens group G3 move in the same direction.

[0131] The first lens group G1 sequentially includes from the object plane side to the image plane side:

[0132] The first lens group G1 with negative refractive power, the second lens group G2 with positive refractive power, and the third lens group G3 with positive refractive power.

[0133] The second lens group G2 sequentially includes from the object plane side to the image plane side:

[013...

Embodiment 3

[0166] Such as Figure 8 As shown, a zoom lens, the zoom lens sequentially includes from the object plane side to the image plane side:

[0167] The first lens group G1 of positive refractive power, the second lens group G2 of negative refractive power, the third lens group G3 of negative refractive power, the stop STO and the fourth lens group G4 of positive refractive power.

[0168] The second lens group G2 and the third lens group G3 move along the main optical axis direction of the zoom lens, and the second lens group G2 and the third lens group G3 move in the same direction.

[0169] The first lens group G1 sequentially includes from the object plane side to the image plane side:

[0170] The first lens group G1 with negative refractive power, the second lens group G2 with positive refractive power, and the third lens group G3 with positive refractive power.

[0171] The second lens group G2 sequentially includes from the object plane side to the image plane side:

[...

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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 sequentially comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with negative focal power, a diaphragm and a fourth lens group with positive focal power from the object plane side to the image plane side; the second lens group and the third lens group move in the main optical axis direction of the zoom lens, and the moving directions of the second lens group and the third lens group are the same; the zoom lens satisfies the following conditional expressions: TTL < 100 mm; FNO is less than 1.8; wherein TTL is the total optical length of the zoom lens, and FNO is the number of apertures of the zoom lens. According to the technical scheme, the zoom lens with a small size is realized, meanwhile, a large aperture number can be realized, the shooting effect of the zoom lens in a low-illumination environment is improved, and the user experience is improved.

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] With the construction of digital cities and smart cities, the demand for surveillance cameras in the field of urban security monitoring is also constantly escalating. The use environment and functional requirements vary widely, which requires security lenses to have a wider range of imaging quality and scope of application. [0003] In the field of security, without changing the distance of the shooting object, the zoom lens can change the field of view angle under the same target surface through the change of the focal length, so as to obtain the change of the size of the imaging picture. When the zoom lens is at the short-focus end, it can take a relatively wide-angle picture to obtain more environmental information, and when it is necessary to zoom in on certain parts of the picture, it can be adjusted to the long-focus end...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/14G02B15/16
CPCG02B15/144109G02B15/16
Inventor 袁多王利钦陈文嘉
Owner JIAXING ZHONGRUN OPTICAL TECH
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