Fisheye lens

A fisheye lens and lens technology, applied in the field of lenses, can solve problems such as insufficiency, achieve long working distance, ensure light, and facilitate structural design and adjustment.

Pending Publication Date: 2020-07-31
FOCTEK PHOTONICS LNC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

F-thera of a small number of fisheye lenses is within +2%. This kind of fisheye lens has no problem in most scenes, but it is insufficient in situations such as video conferencing that require high edge images.

Method used

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Examples

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Embodiment Construction

[0059] The present invention is described in detail below in conjunction with accompanying drawing description:

[0060] Such as Figure 4-9 Shown, a kind of fisheye lens, it is characterized in that: comprise the front mirror group, diaphragm and rear mirror group that are arranged successively along the light incident direction, the ratio of the focal length f of described fisheye lens to the focal length f1 of front mirror group is: -4.2

[0061] The focal length f1 of the front lens group is: -4mm~-6mm, and the front lens group includes a first lens A, a second lens B, a third lens C, a fourth lens D, and a fifth lens arranged in sequence along the light incident direction E, and the sixth lens F;

[0062] The air gap between the first lens A and the second lens B is: 2 mm to 3 mm;

[0063] The air gap between the second lens B and the third len...

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PUM

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Abstract

The invention relates to the field of lenses and particularly relates to a fisheye lens. The fisheye lens comprises a front lens group, a diaphragm and a rear lens group which are sequentially arranged in the incident direction of light, wherein the ratio of the focal length f of the fisheye lens to the focal length f1 of the front lens group is -4.2 <f / f1<-3.6, and the ratio of the focal length fof the fisheye lens to the focal length f2 of the rear lens group is 3.4< f / f2< 5.5. The fisheye lens is advantaged in that the F-thermal distortion of the fisheye lens can reach +10%, the field angle is larger than 190 degrees, the application spectrum range is 400-950 nm, the center is 10 pixels / degrees, an edge is larger than 19.5 pixels / degrees, the pixel size of a sensor is larger than 1.5 microns, and the method can be applied to the environment with high edge image requirements.

Description

technical field [0001] The invention relates to the lens field, in particular to a fisheye lens. Background technique [0002] A fisheye lens is a super wide-angle lens with a short focal length and an angle close to or even exceeding 180°. Because its mechanism is similar to that of a fish's eye, it is called a fisheye lens. Due to the large optical distortion, the edge image is deformed and compressed. Very serious, it is necessary to use an algorithm to decompress and restore the image for easy observation. The fisheye lens based on bionics can "compress and deform" the object space by introducing barrel distortion, so as to obtain ultra-wide-angle imaging with a viewing angle of 180-270 degrees without affecting the resolution. [0003] The imaging of conventional optical systems follows the principle of Gaussian optics. When the object is at a finite distance, y’=βy, and when the object is at an infinite distance, y’=f*tan(ω). In the formula: y' is the ideal image hei...

Claims

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Application Information

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IPC IPC(8): G02B13/06G02B13/00G02B1/00
CPCG02B1/00G02B13/0015G02B13/006G02B13/06
Inventor 黄统樑邱滨滨黄木旺林勇杰刘亦崇
Owner FOCTEK PHOTONICS LNC
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