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Zooming security lens

A lens and security technology, used in optical components, optics, instruments, etc., can solve the problems of serious ghosting and stray light, reduced picture quality, and unfavorable face recognition, so as to improve the recognition speed and accuracy, and reduce ghosting. and stray light to ensure the effect of image quality

Active Publication Date: 2019-12-17
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the existing lenses used for face recognition are fixed-focus lenses, which only have a fixed field of view. When recognizing long-distance faces, the imaging quality is low and the aperture is small, which affects the face when the light is dark. Recognition accuracy; the light distribution of the picture is not uniform enough, the center is bright and the periphery is dark, which is not conducive to the recognition of faces in the peripheral field of view; the ghost and stray light of the system are serious, and the picture quality decreases rapidly under strong light, resulting in the inability to accurately identify people Face

Method used

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  • Zooming security lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 As shown, it is the zoom optical system of this embodiment, which includes in order from the object plane side to the image plane side: the first fixed lens group A with positive refractive power, the zoom lens group B with negative refractive power, the diaphragm S, The second fixed lens group C with positive refractive power and the focusing lens group D with positive refractive power, wherein: the first fixed lens group A and the second fixed lens group C are always in a fixed state, and the variable power lens group B moves along the light The axis moves from the object side to the image plane side as a zoom group, so that the field of view of the lens can be zoomed from the wide-angle end to the telephoto end. At the same time, by making the focusing lens group D align with the zoom lens group B position along the optical axis, The non-linear movement of the imaging wavelength, temperature, and imaging object distance that have a specific functiona...

Embodiment 2

[0066] Such as figure 2 As shown, it is the variable focal length optical system of this embodiment, compared with Embodiment 1, the specific settings of this embodiment are as follows:

[0067] Wide-angle end focal length f W =6.5mm, telephoto end focal length f T =35mm; wide-angle end aperture number FNO W =1.30, the aperture number FNO at the telephoto end T =1.50; wide-angle end half field of view ω W =28.0°, telephoto end half field of view ω T =5.8°; the total optical length of the optical system (that is, the distance from the center apex of the front surface of the first lens to the image plane) TTL=60mm.

[0068]

[0069]

[0070] The corresponding conical coefficient (K) and aspheric coefficient (A, B, C, D, E) of the applied aspheric lens in the present embodiment are as follows:

[0071]

[0072] In this embodiment, the zoom data at the wide-angle end, intermediate magnification position, and telephoto end are as follows:

[0073]

[0074]

...

Embodiment 3

[0085] Such as image 3 Shown is the zoom optical system of this embodiment. Compared with Embodiment 1, the C1 lens and the C2 lens in this embodiment continuously use two pieces of positive power lenses to realize the effect achieved when only one C1 positive lens is used. The focal length of C1 and C2 lenses in this embodiment , Refractive index and Abbe number are in the same range as when only one C1 positive lens is used.

[0086] The specific settings of the zoom optical system in the present embodiment are as follows:

[0087] Wide-angle end focal length f W =10.0mm, telephoto focal length f T =50.0mm; wide-angle end aperture number FNO W =1.30, the aperture number FNO at the telephoto end T =1.50; wide-angle end half field of view ω W =24.5°, telephoto end half field of view ω T =5.0°; the total optical length of the optical system (that is, the distance from the center apex of the front surface of the first lens to the image plane) TTL=85.0mm.

[0088]

[...

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Abstract

he invention discloses a zooming security lens comprising a first fixed lens group with the positive focal power, a zoom lens group with the negative focal power, a diaphragm, a second fixed lens group with the positive focal power, a focusing lens group with the positive focal power and an imaging surface that are arranged successively from an object plane side to an image plane side. While the zoom lens group moves from the object side to the image surface side along the optical axis, the focusing lens group performs nonlinear movement corresponding to the zoom lens group along the optical axis for compensation, so that the high stability of the system image surface in the focal length change process is ensured. According to the lens, 4K resolution, large aperture and infrared confocal performance are realized; distortion of an optical system is remarkably reduced; the brightness ratio is improved; the stray light is eliminated; and popularization of a zoom face recognition camera isfacilitated.

Description

technical field [0001] The invention relates to a technology in the field of optical devices, in particular to a zoom security lens for face recognition. Background technique [0002] Most of the existing lenses used for face recognition are fixed-focus lenses, which only have a fixed field of view. When recognizing long-distance faces, the imaging quality is low and the aperture is small, which affects the face when the light is dark. Recognition accuracy; the light distribution of the picture is not uniform enough, the center is bright and the periphery is dark, which is not conducive to the recognition of faces in the peripheral field of view; the ghost and stray light of the system are serious, and the picture quality decreases rapidly under strong light, resulting in the inability to accurately identify people Face. Contents of the invention [0003] Aiming at the defects and deficiencies of the prior art, the present invention proposes a zoom security lens, which si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/173
CPCG02B15/173
Inventor 廖一州葛航笠盛亚茗尚洁阳
Owner JIAXING ZHONGRUN OPTICAL TECH
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