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Iris recognition optical imaging lens group and imaging method thereof

An optical imaging and iris recognition technology, applied in the fields of optics, optical components, character and pattern recognition, etc., can solve the problems such as the total length of the optical system is not easy to be shortened, the degree of freedom of the optical system is reduced, and the number of components is not easy to decrease, etc. High-volume manufacturing, reduced sensitivity, and less TV distortion

Inactive Publication Date: 2019-01-22
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing optical imaging lens groups for iris recognition can usually meet the requirements of iris recognition, but have the following disadvantages: (1) The use of too many spherical lenses reduces the degree of freedom of the optical system, making it difficult to shorten the total length and weight of the optical system Lighter, smaller in size, and less in number of components; (2) Due to the characteristics of the optical cold processing process of the glass lens itself, the mass production performance of the product is poor

Method used

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  • Iris recognition optical imaging lens group and imaging method thereof
  • Iris recognition optical imaging lens group and imaging method thereof
  • Iris recognition optical imaging lens group and imaging method thereof

Examples

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Embodiment 1

[0045] Example 1 Reference Figure 2 to Figure 5

[0046] In this embodiment, the optical imaging lens group is mainly composed of three lenses, which are in order from the object side to the image side: the first lens with positive refractive power, the surface on the object side is convex, the surface on the image side is concave, and its material It is plastic, and the front object-side surface and image-side surface of the first lens are both aspherical; the second lens with negative refractive power has a convex object-side surface and a concave image-side surface, and its material is plastic. Both the object-side surface and the image-side surface of the lens are aspherical; the third lens with negative refractive power has a convex object-side surface and a concave image-side surface, and its material is plastic. The object-side surface of the third lens, The image-side surfaces are all aspherical, and there is at least one inflection point on the image-side surface of...

Embodiment 2

[0063] Example 2 Reference Figure 6 to Figure 9

[0064] In this embodiment, the optical imaging lens group is mainly composed of three lenses, which are in order from the object side to the image side: the first lens with positive refractive power, the surface 11 on the object side is convex, and the surface 11 on the image side is concave. The material is plastic, and the object-side surface and the image-side surface of the first lens are both aspherical; the second lens with negative focal power has a convex object-side surface and a concave image-side surface, and its material is plastic. Both the object-side surface and the image-side surface of the lens are aspherical; the third lens with negative refractive power has a convex object-side surface and a concave image-side surface, and its material is plastic. The object-side surface of the third lens and The image side surfaces are all aspherical, and there is at least one inflection point on the image side surface of ...

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Abstract

The present invention relates to an optical imaging lens group, in particular to an iris recognition optical imaging lens group and its imaging method, comprising a first lens, an aperture stop, a second lens and a third lens arranged sequentially from the object side to the image side; The object-side surface of the first lens is convex, the image-side surface is concave, and has positive refractive power; the object-side surface of the second lens is convex, the image-side surface is concave, and has negative refractive power, and the second The object-side surface and the image-side surface of the lens are both aspherical surfaces; the third lens has an M-shaped structure and has negative refractive power, the object-side surface of the third lens is convex, and the image-side surface is concave, and the third lens Both the object-side surface and the image-side surface are aspherical, and there is at least one inflection point on the image-side surface of the third lens. The iris recognition optical imaging lens group not only has a simple structure, but also has good mass production performance.

Description

technical field [0001] The invention relates to an optical imaging lens group, in particular to an iris recognition optical imaging lens group and an imaging method thereof. Background technique [0002] At present, with the in-depth research of iris recognition technology, hardware technology and algorithm design are constantly optimized, and iris recognition technology is expected to be widely used in the field of mobile payment. An iris recognition module can be integrated in smart mobile terminal devices such as mobile phones. Due to the widespread use of CMOS (complementary metal oxide semiconductor) sensors in mobile phones and the physical size characteristics of mobile phones, the iris recognition optical imaging lens group has similar requirements to the mobile phone optical imaging lens group. [0003] Existing optical imaging lens groups for iris recognition can usually meet the requirements of iris recognition, but have the following disadvantages: (1) The use o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/18G06K9/00
CPCG02B13/0035G02B13/18G06V40/1324
Inventor 林峰吴锦昇
Owner FUJIAN NORMAL UNIV
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