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Fisheye lens

A fisheye lens and lens technology, applied in the field of lenses, can solve the problems of poor visible and infrared confocality of the lens, high overall cost and weight of the lens, and poor control of lens edge distortion. perfect effect

Inactive Publication Date: 2022-03-01
XIAMEN LEADING OPTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still many shortcomings in the existing fisheye lens, such as too large optical TTL and too many lenses, which make the overall cost and weight of the lens too high, and the installation and use are limited; the visible and infrared confocal performance of the lens is poor. The image quality is not good; because the field of view is too large, the edge distortion control of the general lens is poor, so that the captured picture has obvious deformation, which affects the post-processing of the image

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] refer to figure 1 As shown, this embodiment discloses a fisheye lens, which sequentially includes a first lens 1, a second lens 2, a third lens 3, a diaphragm 7, and a fourth lens 4 along an optical axis from the object side A1 to the image side A2 , the fifth lens 5 and the sixth lens 6, each of the first lens 1 to the sixth lens 6 includes an object side facing the object side A1 and allowing the imaging light to pass through and an image facing the image side A2 and allowing the imaging light to pass through side;

[0129] The first lens 1 has a negative refractive power, the object side of the first lens 1 is convex, and the image side is concave;

[0130] The second lens 2 has a negative refractive power, the object side of the second lens 2 is concave, and the image side is convex;

[0131] The third lens 3 has a positive refractive power, the object side of the third lens 3 is concave, and the image side is convex;

[0132] The fourth lens 4 has a positive ref...

Embodiment 2

[0143] Cooperate Figure 8 to Figure 14 As shown, the concave-convex surface and refractive power of each lens in this embodiment and the first embodiment are roughly the same, and the optical parameters such as the radius of curvature of the lens surface and the thickness of the lens are different.

[0144] The detailed optical data of this specific embodiment is shown in Table 2.

[0145] The detailed optical data of table 2 embodiment two

[0146] surface type Caliber size (diameter) radius of curvature thickness material Refractive index Dispersion coefficient focal length 0 Infinity Infinity 1 4.939 6.400 0.3500 2 first lens 3.032 6.547 0.4498 D-LAF050 1.77 49.2902 -1.8000 3 1.529 1.111 0.6465 4 second lens 1.329 -1.567 0.8501 EP8000 1.67 20.3815 -12.3875 5 1.180 -2.353 0.0543 6 third lens 1.104 -6.654 0.4023 APL5014CL_14 1.55 55.9870 ...

Embodiment 3

[0151] Cooperate Figure 15 to Figure 21 As shown, the concave-convex surface and refractive power of each lens in this embodiment and the first embodiment are roughly the same, and the optical parameters such as the radius of curvature of the lens surface and the thickness of the lens are different.

[0152] The detailed optical data of this specific embodiment is shown in Table 3.

[0153] The detailed optical data of table 3 embodiment three

[0154] surface type Caliber size (diameter) radius of curvature thickness material Refractive index Dispersion coefficient focal length 0 Infinity Infinity 1 4.935 6.4000 0.3500 2 first lens 3.031 6.5611 0.4490 D-LAF050 1.7713 49.2902 -1.793 3 1.529 1.1083 0.6538 4 second lens 1.287 -1.5667 0.8506 EP9000 1.6776 19.2758 -12.362 5 1.126 -2.3498 0.0540 6 third lens 1.046 -6.722 0.403 K26R 1.54 55.71 2...

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Abstract

The invention discloses a fisheye lens, which comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens, and is characterized in that each of the first to sixth lenses comprises an object side surface and an image side surface; the first lens has a negative refractive index, the second lens has a negative refractive index, the third lens has a positive refractive index, the fourth lens has a positive refractive index, the fifth lens has a negative refractive index, the sixth lens has a positive refractive index, the fisheye lens has only six lenses with refractive indexes, TTL is less than 5mm, and TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis. The number of the lenses is small, the optical TTL is smaller than 5 mm, the cost of the lens is lower, the overall size is smaller, the weight is lighter, and installation and use are convenient; the lens is good in visible and infrared confocal property, and can have relatively good imaging quality under a night vision condition; distortion control is perfect, edge deformation of a shot picture is small, and later image processing is facilitated.

Description

technical field [0001] The invention relates to the technical field of lenses, in particular to a fisheye lens. Background technique [0002] A fisheye lens is a lens with a focal length of 16mm or less and a viewing angle close to or equal to 180°. Since the front lens of the lens has a large diameter and protrudes toward the front of the lens in a parabolic shape, it is quite similar to the eyes of a fish. Therefore, it is commonly known as "fisheye lens". At present, fisheye lens has been widely used in VR cameras, security monitoring, video conferencing, drones, vehicles and other fields. Therefore, the requirements for fisheye lenses are getting higher and higher. [0003] However, there are still many shortcomings in the existing fisheye lens, such as too large optical TTL and too many lenses, which make the overall cost and weight of the lens too high, and the installation and use are limited; the visible and infrared confocal performance of the lens is poor. The ima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/06G02B13/00G02B13/18G02B13/14
CPCG02B13/06G02B13/0015G02B13/0045G02B13/008
Inventor 游赐天范智宇张荣曜
Owner XIAMEN LEADING OPTICS