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Near-infrared large-aperture lens

A near-infrared and aperture technology, applied in the field of optical lenses, can solve problems such as small field of view, small aperture, and large distortion

Active Publication Date: 2016-08-31
HUNAN VISUALTOURING INFORMATION TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary lenses used for surveillance have shortcomings such as small field of view, small aperture, and large distortion, and cannot fully meet the needs of increasingly popular technologies such as 3D recognition and somatosensory interaction. Therefore, there is an urgent need for a large aperture, large field of view, and small distortion. Small and lightweight near-infrared optical lens

Method used

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  • Near-infrared large-aperture lens

Examples

Experimental program
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Embodiment 1

[0038] see figure 1 , the present embodiment provides a near-infrared large-aperture lens 10, the near-infrared large-aperture lens 10 includes seven lenses arranged in sequence along the optical axis from the object side to the image side, wherein;

[0039] The first lens 100 has a meniscus shape with negative refractive power, and the convex surface faces the object side;

[0040] The second lens 200 is a biconvex lens with positive power;

[0041] The third lens 300 is a biconvex lens with positive power;

[0042] The fourth lens 400 is a biconcave lens with negative power;

[0043] The fifth lens 500 has a meniscus shape with a positive refractive power, and the convex surface faces the image side;

[0044] The sixth lens 600 is a biconvex lens with positive power;

[0045] The seventh lens 700 has a meniscus shape with negative refractive power, and its convex surface faces the object side.

[0046] On the basis of the above structure, further, the first lens 100 , t...

Embodiment 2

[0063] see figure 2 , the near-infrared large-aperture lens 20 provided by this embodiment has the same basic structure, principle and technical effect as that of the first embodiment. For a brief description, the part not mentioned in this embodiment can refer to the first embodiment corresponding content in the example.

[0064] Table 2 lists the relevant parameters of each lens in this embodiment, including the surface shape and radius of curvature of the lens, as well as the thickness, material, effective diameter and conic coefficient of each lens.

[0065] In this embodiment, system parameters: 1 / 3", aperture 1.2, diagonal field of view 50°, sensing wavelength 830-870nm.

[0066] Table II

[0067]

[0068]

[0069] Figure 6 to Figure 10 The optical performance curve corresponding to the near-infrared large aperture lens 20 provided in this embodiment. Figure 6 to Figure 9 Characterize the MTF (Modulation Transfer Function) curves of the near-infrared large-a...

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Abstract

The invention provides a near-infrared large-aperture lens which comprises seven lenses which are sequentially arranged from the object space to the image space along the direction of an optical axis, wherein the first lens is in crescent shape with negative power, and the convex side faces to the object space; the second lens is a biconvex lens with positive focal power; the third lens is a biconvex lens with positive focal power; the fourth lens is a biconcave lens with negative focal power; the fifth lens is in crescent shape with a positive focal power, and the convex side faces to the image space; the sixth lens is a biconvex lens with positive focal power; and the seventh lens is in crescent shape with positive focal power, and the convex side faces to the object space. According to the near-infrared large-aperture lens, seven lenses are adopted, and by designing the shapes of the seven lenses and utilizing focal power distribution, the near-infrared large-aperture lens realizes the optical performances of large aperture, large visual field and small distortion.

Description

technical field [0001] The invention relates to the field of optical lenses, in particular to a near-infrared large aperture lens. Background technique [0002] With the development of laser lighting technology, three-dimensional recognition, somatosensory interaction, and gesture recognition technology, the demand for near-infrared light sources and near-infrared optical lenses is becoming more and more extensive. The existing near-infrared lenses on the market are generally ordinary day and night lenses with IR, and there are very few lenses professionally used for near-infrared imaging. Ordinary lenses used for surveillance have shortcomings such as small field of view, small aperture, and large distortion, and cannot fully meet the needs of increasingly popular technologies such as 3D recognition and somatosensory interaction. Therefore, there is an urgent need for a large aperture, large field of view, and small distortion. Small and lightweight near-infrared optical l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/14G02B13/00
CPCG02B13/005G02B13/14
Inventor 陈杭李洪
Owner HUNAN VISUALTOURING INFORMATION TECH CO LTD
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