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A Wide Working Distance Iris Imaging Lens

An imaging lens and working distance technology, applied in instruments, computing, optics, etc., can solve the problems of iris recognition equipment that is not suitable for the number of times of use, easy wear and tear of rivets and cam grooves, and reduced service life, and achieves light weight and high strength. The number of times of use required, the effect of small deformation of the iris image

Active Publication Date: 2021-05-25
SUZHOU SIYUAN KEAN INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional zoom lens combined with the ultrasonic motor can meet the working distance of a small range, but because the zoom is controlled by the cam groove, the rivet and the cam groove are easy to wear, which greatly reduces the service life, and is not suitable for iris recognition equipment with a large number of uses.
The aspherical iris lens can improve its depth of field to a certain extent, but the improvement is limited and the manufacturing cost is expensive, so it has not been widely used.
None of the current iris recognition objective lenses can well meet the needs of wide working distance, long service life, low manufacturing cost, and high imaging quality

Method used

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  • A Wide Working Distance Iris Imaging Lens
  • A Wide Working Distance Iris Imaging Lens
  • A Wide Working Distance Iris Imaging Lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Now take the embodiment of the iris imaging system of the present invention as an example to illustrate the actual effect it can achieve.

[0040] Optical system parameters EFL=1.0mm BFL=0.38mm

[0041]

[0042] This embodiment is a wide working distance iris imaging lens, such as figure 1 As shown, it consists of 7 groups of 8 lens structures, including: the front component G1 with positive refractive power, the zoom component G2 with variable refractive power, and the positive refractive power The rear component G3.

[0043] The front component G1 includes a first lens 1 with positive refractive power, a second lens 2 with positive refractive power, and a third lens 3 with negative optical focal length arranged in sequence from the object side to the image side.

[0044] The zoom component G2 is composed of a fourth lens 4 with a variable focal length.

[0045] The rear component G3 includes the fifth lens 5 with a negative optical focal length, the sixth lens 6...

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Abstract

The invention discloses a wide working distance iris imaging lens, which comprises sequentially arranged from the object side to the image side: a front component with positive optical power, a zoom component with variable optical power and a rear group with positive optical power It is composed of 7 groups of lenses, with simple structure, convenient installation, small and compact size and light weight, low manufacturing cost, wide working distance, clear imaging, uniform and bright image, and small deformation of iris image.

Description

technical field [0001] The invention relates to an iris imaging device, in particular to an iris imaging lens with a wide working distance. Background technique [0002] Nowadays, with the continuous improvement of material living standards, Internet information security and identity authentication have been continuously improved and improved. Among many biometric authentication technologies, iris recognition technology has been recognized by the market due to its advantages of non-contact, high accuracy, good stability, and high security. However, the ordinary iris recognition equipment currently on the market requires that the distance from the user's eyes to the iris recognition objective lens be equal to a certain fixed value when taking iris images, so that the instrument can effectively capture the iris of the human eye and obtain a clear iris image, which greatly increases the It is difficult for users to use, which is extremely inconvenient and affects user experien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/04G06K9/00
Inventor 倪蔚民吴锦昇
Owner SUZHOU SIYUAN KEAN INFORMATION TECH
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