Fisheye lens

A fisheye lens and lens technology, applied in the field of imaging lens, can solve the problem that it is difficult to meet the diversified use requirements of drones, and achieve the effects of reasonable setting, strong thermal stability, and reduced volume and weight

Active Publication Date: 2022-02-01
JIANGXI LIANCHUANG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, conventional optical lenses on the market are difficult to meet the diversified use needs of drones

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] see figure 1 , which is a schematic structural diagram of the fisheye lens 100 provided in Embodiment 1 of the present invention, the fisheye lens includes in sequence from the object side to the imaging surface along the optical axis: a first lens L1, a second lens L2, a third lens L3, The optical centers of the diaphragm ST, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1 are located on the same straight line.

[0120] The first lens L1 has negative refractive power, the object side S1 of the first lens is a convex surface, and the image side S2 of the first lens is a concave surface;

[0121] The second lens L2 has a negative refractive power, the object side S3 of the second lens is a convex surface, and the image side S4 of the second lens is a concave surface;

[0122] The third lens L3 has positive refractive power, the object side S5 of the third lens is a convex surface at the near optical axis, and the image si...

Embodiment 2

[0139] see Figure 5 , which is a schematic structural view of the fisheye lens 200 provided in Embodiment 2 of the present invention. The fisheye lens 200 in this embodiment is roughly the same as the fisheye lens 100 in Embodiment 1. The reason is that there are differences in the radius of curvature and thickness of each lens and the air space between each lens.

[0140] The relevant parameters of each lens of the fisheye lens 200 provided in this embodiment are shown in Table 2-1.

[0141] table 2-1

[0142]

[0143] The relevant parameters of the aspheric lens of the fisheye lens 200 in this embodiment are shown in Table 2-2.

[0144] Table 2-2

[0145]

[0146] In this embodiment, the MTF curve, the F-Theta distortion curve, and the axial chromatic aberration curve of the fisheye lens 200 are as follows: Image 6 , Figure 7 and Figure 8 shown.

[0147] see Image 6 , shows the MTF curve diagram of the fisheye lens in this embodiment, the horizontal axis r...

Embodiment 3

[0151] see Figure 9 , which is a schematic structural diagram of the fisheye lens 300 provided in Embodiment 3 of the present invention. The surface unevenness of each lens of the fisheye lens 300 in this embodiment and the fisheye lens 100 in Embodiment 1 is roughly the same, and the difference is The reason is that there are differences in the radius of curvature and thickness of each lens and the air space between each lens.

[0152] The relevant parameters of each lens of the fisheye lens 300 provided in this embodiment are shown in Table 3-1.

[0153] Table 3-1

[0154]

[0155] The relevant parameters of the aspheric lens of the fisheye lens 300 in this embodiment are shown in Table 3-2.

[0156] Table 3-2

[0157]

[0158] In this embodiment, the MTF curve diagram, the F-Theta distortion curve diagram, and the axial chromatic aberration curve diagram of the fisheye lens 300 are respectively as follows Figure 10 , Figure 11 and Figure 12 shown.

[0159] ...

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Abstract

The invention discloses a fisheye lens which comprises seven lenses in total, and the fisheye lens sequentially comprises first to third lenses, a diaphragm and fourth to seventh lens from an object side to an imaging surface along the optical axis; the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, the object side surface of the third lens near the optical axis is a convex surface, and the image side surface of the third lens is a convex surface ; the object side surface and the image side surface of the fourth lens with positive focal power are convex surfaces; the fifth lens has positive focal power, and the object side surface and the image side surface of the fifth lens are convex surfaces; the sixth lens has negative focal power, and the object side surface and the image side surface of the sixth lens are concave surfaces; and the object side surface and the image side surface of the seventh lens with positive focal power are convex surfaces. The fisheye lens at least comprises a lens made of a glass material and a lens made of a plastic material. The fisheye lens has the advantages of high thermal stability, miniaturization, light weight, large aperture, ultra-large wide angle and the like.

Description

technical field [0001] The invention relates to the technical field of imaging lenses, in particular to a fisheye lens. Background technique [0002] With the development of mobile internet, coupled with the popularity of social networking, video, and live broadcast software, people are more and more fond of photography, and their pursuit of imaging effects is also more diversified, requiring not only high-definition image quality, but also a large field of view With the ability to capture large-scale images with strong visual impact, drones have won the favor of consumers for their unique high-altitude perspective and wide-format shooting images. At present, UAVs are developing rapidly, and correspondingly, the demand for their supporting optical lenses is also increasing. [0003] Since UAVs are often used in complex environments such as severe vibration, high pressure and extreme temperature, the performance requirements for the optical lens are extremely high. It must h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/06
CPCG02B13/0045G02B13/06
Inventor 高博鲍海江李伟娜赖晗何晓源岑镜谋
Owner JIANGXI LIANCHUANG ELECTRONICS CO LTD
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