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A long focal length zoom lens and image pickup device

A zoom lens and long focal length technology, applied in the field of optics, can solve problems such as image quality limitations at the telephoto end, achieve the effects of reducing insufficient optical power, realizing miniaturization, and reducing costs

Active Publication Date: 2022-04-22
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the field of security lenses, the common ultra-telephoto lens is still a zoom lens with a large zoom ratio. Image quality is limited to a certain extent

Method used

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  • A long focal length zoom lens and image pickup device
  • A long focal length zoom lens and image pickup device
  • A long focal length zoom lens and image pickup device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment one, such as figure 1 and figure 2 As shown, a long focal length zoom lens, the long focal length zoom lens is composed of five lens groups, and the long focal length zoom lens includes in turn from the object plane side to the image plane side:

[0034] The first fixed lens group G1 of positive power, the zoom lens group G2 of negative power, the stop STO, the second fixed lens group G3 of positive power, the focusing lens group G4 of positive power, and the adjustment lens group G5, The zoom lens group G2 and the focus lens group G4 move along the optical axis direction of the long focal length zoom lens.

[0035] The first fixed lens group G1 is sequentially composed of a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, and a third lens L3 with negative refractive power from the object plane side to the image plane side. The fourth lens L4 is composed of the fi...

Embodiment 2

[0067] Embodiment two, such as Figure 1 to Figure 4 As shown, a long focal length zoom lens, the long focal length zoom lens is composed of five lens groups, and the long focal length zoom lens includes in turn from the object plane side to the image plane side:

[0068] The first fixed lens group G1 with positive refractive power, the zoom lens group G2 with negative refractive power, the diaphragm STO, the second fixed lens group G3 with positive refractive power, the focusing lens group G4 with positive refractive power, the The adjustment lens group G5 and the auxiliary group, the zoom lens group G2 and the focus lens group G4 move along the optical axis direction of the zoom lens.

[0069] The first fixed lens group G1 consists of the first lens L1 with positive refractive power, the second lens L2 with negative refractive power, the third lens L3 with positive refractive power, and the third lens L3 with negative refractive power from the object plane side to the image ...

Embodiment 3

[0103] Embodiment three, such as Figure 5 to Figure 8 As shown, a long focal length zoom lens, the long focal length zoom lens is composed of five lens groups, and the long focal length zoom lens includes in turn from the object plane side to the image plane side:

[0104]The first fixed lens group G1 with positive refractive power, the zoom lens group G2 with negative refractive power, the diaphragm STO, the second fixed lens group G3 with positive refractive power, the focusing lens group G4 with positive refractive power, the The adjustment lens group G5 and the auxiliary group, the zoom lens group G2, the focus lens group G4 and the adjustment lens group G5 move along the optical axis direction of the zoom lens.

[0105] The first fixed lens group G1 consists of the first lens L1 with positive refractive power, the second lens L2 with negative refractive power, the third lens L3 with positive refractive power, and the third lens L3 with negative refractive power from the ...

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Abstract

The invention discloses a long focal length zoom lens and an image pickup device, and relates to the technical field of optics. The telephoto zoom lens is composed of five lens groups. The telephoto zoom lens includes in order from the object surface side to the image plane side: a first fixed lens group with positive refractive power, a zoom lens group with negative refractive power, diaphragm, positive light The second fixed lens group of power, the focus lens group of positive refractive power and the adjustment lens group, the zoom lens group and the focus lens group move along the optical axis direction of the long focal length zoom lens; the first fixed lens group is from the object side to the image The face side is composed of a first lens with positive power, a second lens with negative power, a third lens with positive power, a fourth lens with negative power and a fifth lens with positive power. The first lens is cemented with the second lens, and the fourth lens is cemented with the fifth lens. The miniaturization of the telephoto zoom lens is realized, and the cost of the telephoto zoom lens is greatly reduced.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a long focal length zoom lens and an image pickup device. Background technique [0002] In the field of photography and security lenses, the wide-angle end of the optical lens is generally to restore the effect of the human eye to obtain the field of view, while the telephoto end of the optical lens is often a visual experience that cannot be directly touched by the human eye. Therefore, extending the focal length of the telephoto end has always been a The research direction of the lens company. [0003] In the field of photographic lenses, companies such as Canon and Fuji have launched their own lenses with a focal length of 100-400mm. Compared with the traditional 70-200mm, the close-up lens at the telephoto end has significantly improved. [0004] In the field of security lenses, the common ultra-telephoto lens is still a zoom lens with a large zoom ratio. The picture quali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/14G02B15/16
CPCG02B15/145113G02B15/145129G02B15/16
Inventor 向诗文徐云彬诸益炜
Owner JIAXING ZHONGRUN OPTICAL TECH