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Zoom lens with large zoom ratio

A zoom lens and large zoom ratio technology, applied in the field of optical lenses, can solve problems such as poor manufacturability, large monitoring blind spots, and poor imaging quality, and achieve the effects of good manufacturability, large monitoring range, and small deformation in large batches

Pending Publication Date: 2021-12-28
XIAMEN LEADING OPTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing zoom lenses with large zoom ratios mainly have the following problems: large lens distortion, unable to meet the requirements of video communication; low image quality and definition; small field of view, large monitoring blind spots; large temperature drift, when the temperature is too high Or when it is too low, the imaging quality is poor; most of them use five-component mechanism, which leads to poor manufacturability and low yield

Method used

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  • Zoom lens with large zoom ratio
  • Zoom lens with large zoom ratio
  • Zoom lens with large zoom ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] refer to Figure 1 to Figure 2 As shown, the present invention discloses a large zoom ratio zoom lens, which includes a front fixed group, a zoom group, a rear fixed group and a compensation group arranged sequentially along an optical axis from the object side to the image side, and the front fixed group The positions of the fixed group and the rear fixed group are fixed. The zoom group can move along the optical axis to adjust the focal length of the lens. The compensation group can move along the optical axis to compensate for the offset of the image plane position of the lens during the zooming process. The coordinated movement of the magnification group and the compensation group realizes the zoom function of the entire lens. Wherein, the first lens of the variable power group close to the object side is a correction lens, and the correction lens is an aspherical lens, and both surfaces are aspherical.

[0081] In this embodiment, the zoom lens includes fourteen l...

Embodiment 2

[0099] Such as Figure 11 to Figure 12 As shown, the concave-convex surface shape and refractive index of each lens in this embodiment and embodiment 1 are roughly the same, and the optical parameters such as the radius of curvature of the lens surface and lens thickness are different.

[0100] The detailed optical data of this embodiment at the shortest focal length is shown in Table 2-1.

[0101] Detailed optical data at the time of the shortest focal length of table 2-1 embodiment 2

[0102]

[0103]

[0104] The detailed optical data of this embodiment at the longest focal length are shown in Table 2-2.

[0105] Detailed optical data at the time of the longest focal length of Table 2-2 embodiment 2

[0106]

[0107]

[0108] In this embodiment, the sixth lens 6 is an aspheric lens, and both surfaces thereof are aspherical, and the aspheric surface data are shown in Table 2-3.

[0109]

[0110] In this embodiment, when the zoom lens is at the shortest foca...

Embodiment 3

[0112] Such as Figure 21 to Figure 22 As shown, the concave-convex surface shape and refractive index of each lens in this embodiment and embodiment 1 are roughly the same, and the optical parameters such as the radius of curvature of the lens surface and lens thickness are different.

[0113] The detailed optical data at the shortest focal length of this embodiment are shown in Table 3-1.

[0114] Detailed optical data when the shortest focal length of table 3-1 embodiment 3

[0115]

[0116]

[0117] The detailed optical data at the longest focal length of this embodiment are shown in Table 3-2.

[0118] Detailed optical data at the longest focal length of Table 3-2 embodiment 3

[0119]

[0120]

[0121] In this embodiment, the sixth lens 6 is an aspheric lens, and both surfaces thereof are aspheric surfaces, and the aspheric surface data thereof are shown in Table 3-3.

[0122]

[0123] In this embodiment, when the zoom lens is at the shortest focal poin...

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Abstract

The invention discloses a zoom lens with a large zoom ratio. The zoom lens comprises a front fixed group, a zoom group, a rear fixed group and a compensation group which are sequentially arranged along an optical axis from an object side to an image side, the positions of the front fixed group and the rear fixed group are fixed, and the zoom group can move along the optical axis to adjust the focal length of the lens. The compensation group can move along the optical axis direction to compensate the offset of the image surface position of the lens in the zooming process, the first lens, close to the object side, of the zooming group is a correction lens, the correction lens is an aspheric lens, and the refractive index nd of the correction lens is greater than 1.8. The zoom lens with the large zoom ratio is small in full-focal-length distortion, clear in image quality and small in temperature drift, adopts a four-component structure, and is simple in structure, easy to assemble, high in yield and good in large-batch manufacturability.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to a large zoom ratio zoom lens. Background technique [0002] Due to the fixed field of view of the fixed-focus lens, a product can only be used in specific scenarios, resulting in fixed-focus lenses that cannot meet the use requirements in many scenarios. Large zoom ratio zoom lenses are more and more popular in the market because of their continuously variable focal length and continuously variable field of view within a certain range, which can adapt to more application scenarios. The existing zoom lenses with large zoom ratios mainly have the following problems: large lens distortion, unable to meet the requirements of video communication; low image quality and definition; small field of view, large monitoring blind spots; large temperature drift, when the temperature is too high Or when it is too low, the imaging quality is poor; most of them use five-component mechani...

Claims

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Application Information

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IPC IPC(8): G02B15/14G02B15/16
CPCG02B15/144G02B15/16
Inventor 张荣曜
Owner XIAMEN LEADING OPTICS