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Near-infrared large-aperture lens

A near-infrared and lens technology, applied in optics, optical components, instruments, etc., can solve the problems of insufficient collection of reflected infrared light, reduced three-dimensional space measurement accuracy, and difficulty in meeting a large amount of light. Small incident angle, the effect of reducing the incident angle

Pending Publication Date: 2018-10-12
舜宇光学(中山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the common large-aperture near-infrared lens is generally composed of 6-10 lenses. In the application environment with extremely weak light, it is difficult to meet the requirements of the large amount of light. It cannot collect enough reflected infrared light and the brightness of the edge of the imaging surface is relatively dark. , which reduces the measurement accuracy of the three-dimensional space

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0105] figure 1 It schematically shows the structural diagram of the near-infrared large aperture lens according to the first embodiment of the present invention.

[0106] According to the data given in Embodiment 1 in Table 1, in this embodiment, the effective focal length of the near-infrared large aperture lens is f=4.27mm, the aperture number F / #=1.10, the relative illuminance RI=59.85%, and the distortion Dis< 7.50%, half field of view angle FOV = 45 degrees, total length TTL = 19.65mm.

[0107] The following table 3 lists the relevant parameters of the lens lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number and conic coefficient:

[0108]

[0109]

[0110] table 3

[0111] In this embodiment, the aspherical data are shown in Table 4 below:

[0112] Aspheric coefficient

A4

A6

A8

A10

A12

S14

3.04E-003

-1.27E-004

-1.46E-006

7.32E-006

-2.20E-008

...

Embodiment approach 2

[0118] Figure 4 It schematically shows the structure diagram of the near-infrared large aperture lens according to the second embodiment of the present invention.

[0119] According to the data given in Embodiment 2 in Table 1, in this embodiment, the effective focal length f=4.24mm of the near-infrared large aperture lens, the aperture number F / #=1.05, the relative illuminance RI=56.79%, and the distortion Dis <7.00%, half field angle FOV=47 degrees, total length TTL=19.80mm.

[0120] The following table 5 lists the relevant parameters of the lens lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number and conic coefficient:

[0121]

[0122]

[0123] table 5

[0124] In this embodiment, the aspherical data are shown in Table 6 below:

[0125] Aspheric coefficient

A4

A6

A8

A10

A12

S14

3.25E-003

-1.14E-004

-9.90E-007

8.36E-007

-2.85E-008

S15

3.91E...

Embodiment approach 3

[0131] Figure 7 It schematically shows the structure diagram of the near-infrared large aperture lens according to the third embodiment of the present invention.

[0132] According to the data given in Embodiment 3 in Table 1, in this embodiment, the effective focal length of the near-infrared large aperture lens is f=4.27mm, the aperture number F / #=1.00, the relative illuminance RI=63.00%, and the distortion Dis< 7.50%, half field angle FOV=48 degrees, total length TTL=20.00mm.

[0133] The following table 7 lists the relevant parameters of the lens lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number and conic coefficient:

[0134]

[0135] Table 7

[0136] In this embodiment, the aspherical data are shown in Table 8 below:

[0137] Aspheric coefficient

A4

A6

A8

A10

A12

S14

1.41E-003

6.40E-005

-1.61E-005

6.16E-007

-1.23E-009

S15

6.29E-003

-3.10...

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PUM

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Abstract

The invention relates to a near-infrared large-aperture lens. The lens comprises a first lens,a second lens,a third lens,a diaphragm,a fourth lens,a fifth lens,a sixth lens and a seventh lens which are sequentially arranged from the object side to the imaging side; the first lens,the fourth lens and the fifth lens are negative light focus lenses; the second lens,the third lens,the sixth lens and the seventh lens are positive light focus power lenses; in the direction from the object side to the image side,the first lens is a convex-concave lens; the fifth lens is a concave-convex lens; the sixth lens is a dual-convex lens; the seven lens is a convex-concave lens. The near-infrared large-aperture lens has the advantages of being large in view angle,low in deformation and small in size.

Description

technical field [0001] The invention relates to the technical field of optical detection system design, in particular to a near-infrared large aperture lens. Background technique [0002] Infrared detection lenses are widely used in military equipment, security monitoring, three-dimensional space measurement, etc. With the expansion of applications to high-tech fields, new and higher requirements are put forward for infrared detection lenses. The most important performance index of the infrared detection lens is the requirement for the amount of received light, which requires that it can still collect the infrared light reflected by the object to the greatest extent in a weak light environment, so as to fully obtain the information of the target object; and ensure that The edge of the image plane has higher brightness to improve the detection ability of the edge field of view. At the same time, the infrared detection lens also needs to meet the requirements of large angle,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/14G02B13/18G02B13/06G02B1/00
CPCG02B13/06G02B13/14G02B13/18G02B1/00
Inventor 韦晓鹏
Owner 舜宇光学(中山)有限公司
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