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CN-224232033-U - Ultra-clear undistorted face recognition lens

CN224232033UCN 224232033 UCN224232033 UCN 224232033UCN-224232033-U

Abstract

The utility model provides an ultra-clear undistorted face recognition lens, in particular relates to the technical field of camera lenses, and aims to solve the technical problems that an existing face recognition lens is poor in stability under a high-temperature environment, and image quality is easily interfered under night or complex light conditions, so that using effects are affected. The utility model comprises a lens shell, a first lens element, a second lens element, a third lens element, a fourth lens element, a diaphragm, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element, a cover, a rear cover and a lens barrel which are arranged in sequence from the object side to the image side and are arranged in the lens shell. The utility model effectively inhibits and corrects various aberrations, thereby realizing wide field angle, good aperture control and clear imaging effect, simultaneously still maintaining stable and high-quality imaging effect under complex light and high-temperature environment, and being particularly suitable for diversified requirements in various face recognition and monitoring scenes.

Inventors

  • YANG WENHUI
  • WANG PENG

Assignees

  • 大英彰骏光电科技有限公司

Dates

Publication Date
20260512
Application Date
20250710

Claims (8)

  1. 1. The ultra-clear undistorted face recognition lens is characterized by comprising a lens shell (1), a first lens element (L1), a second lens element (L2), a third lens element (L3), a fourth lens element (L4), a diaphragm (2), a fifth lens element (L5), a sixth lens element (L6), a seventh lens element (L7), an eighth lens element (L8), a cover, a rear cover and a lens barrel, wherein the first lens element, the second lens element, the third lens element (L3), the fourth lens element (L4), the diaphragm (2), the fifth lens element (L5) and the sixth lens element (L6) are arranged in sequence from the object side to the image side; The first lens element (L1) is a meniscus lens, the second lens element (L2) is a meniscus lens, the third lens element (L3) is a meniscus lens, the fourth lens element (L4) is a biconvex lens, the diaphragm (2) is a diameter for controlling the size of an aperture, the fifth lens element (L5) is a meniscus lens, the sixth lens element (L6) is a plano-convex lens, the seventh lens element (L7) is a meniscus lens, and the eighth lens element (L8) is a biconvex lens; the mirror surface of the sixth lens element (L6) is matched with the object surface of the seventh lens element (L7); The first lens element (L1), the second lens element (L2), the third lens element (L3), the fourth lens element (L4), the fifth lens element (L5), the sixth lens element (L6), the seventh lens element (L7) and the eighth lens element (L8) are all glass lens elements.
  2. 2. The ultra-clear distortion-free face recognition lens according to claim 1, wherein the first to eighth lens elements (L1) to (L8) satisfy the following conditional formulas ：Nd1≥1.78800,Vd1≥47.50;Nd2≥1.78800,Vd2≥47.50;Nd3≥1.78800,Vd3≥47.50;Nd4≥1.92286,Vd4≥20.88;Nd5≥1.51700,Vd5≥64.20;Nd6≥1.49100,Vd6≥57.40;Nd7≥1.88300,Vd7≥40.50;Nd8≥1.88300,Vd8≥40.50;, nd2, nd3, nd4, nd5, nd6, nd7, nd8 respectively, wherein Nd1, nd6, nd7, nd8 respectively represent the d-ray refractive index of the material of the first lens element (L1), the second lens element (L2), the third lens element (L3), the fourth lens element (L4), the fifth lens element (L5), the sixth lens element (L6), the seventh lens element (L7), the eighth lens element (L8), and Vd1, vd2, vd3, vd4, vd5, vd6, vd7, vd8 respectively represent the light constants of the material of the first lens element (L1), the second lens element (L2), the third lens element (L3), the fourth lens element (L4), the fifth lens element (L5), the sixth lens element (L6), the seventh lens element (L7), and the eighth lens element (L8).
  3. 3. The ultra-clear undistorted face recognition lens as claimed in claim 1, wherein the distance from the outermost point of the object side of the first lens element (L1) to the imaging plane is such that the total optical length S4=28.7+ -0.3 mm is satisfied.
  4. 4. The ultra-clear undistorted face recognition lens as claimed in claim 1, wherein the lens housing (1) is made of all-metal materials.
  5. 5. The ultra-clear undistorted face recognition lens as claimed in claim 1, wherein the total lens composition is s2=21.26±0.3mm, the total lens product is s3=22.6±0.3mm, the total lens structure is s5=24.1±0.3mm, the mechanical back focus s6=3.8±0.1mm, and the optical back focus s7=3.0±0.1mm.
  6. 6. The ultra-clear undistorted face recognition lens as recited in claim 4, wherein the surfaces of the first lens element (L1) and the eighth lens element (L8) are provided with infrared cut-off films.
  7. 7. The ultra-clear undistorted face recognition lens as recited in claim 1, wherein the sixth lens element (L6) is an aspherical lens.
  8. 8. The ultra-clear undistorted face recognition lens as recited in claim 1, wherein surfaces of the first lens element (L1) to the eighth lens element (L8) are plated with a plurality of layers of wide-spectrum antireflection films.

Description

Ultra-clear undistorted face recognition lens Technical Field The utility model relates to the technical field of camera lenses, in particular to an ultra-clear undistorted face recognition lens. Background Currently, face recognition technology is widely applied in various fields, and the performance of the face recognition technology directly determines the application effect. However, the existing optical lens has a plurality of defects in terms of recognition accuracy and distortion-free control. The lens adopting the traditional optical design can keep the image clear in the center of the human face, but blurring or no distortion easily occurs at the boundary, and especially in a wide-angle lens, the image is more obvious in no distortion, so that the accuracy of human face recognition is affected. In addition, as the image quality requirements increase, 2K pixel-level lenses are a goal pursued by the industry. In order to realize 2K pixels, the existing optical lens needs to add more lenses and complex optical structures, which not only leads to the increase of the cost of the lens, but also increases the thickness and weight of the lens, so that the design and installation of the lens are more complex. Meanwhile, some special application occasions, such as work under high-temperature environment, night or use under complex light environment, have higher requirements on the durability and adaptability of the lens. The existing lens has poor stability under high-temperature environment, and the image quality is easy to be interfered at night or under complex light conditions, so that the using effect is affected. Therefore, the ultra-clear undistorted face recognition optical lens capable of meeting the requirements of high definition, no distortion, high temperature resistance and complex light conditions is developed, and has important practical significance. Disclosure of utility model The utility model aims to provide an ultra-clear undistorted face recognition lens which effectively inhibits and corrects various aberrations, so that a wide field angle, good aperture control and a clear imaging effect are realized, meanwhile, the stable and high-quality imaging effect can be kept under complex light and high-temperature environments, and the ultra-clear undistorted face recognition lens is particularly suitable for diversified requirements in various face recognition and monitoring scenes. The embodiment of the utility model is realized by the following technical scheme: An ultra-clear undistorted face recognition lens comprises a lens shell, a first lens element, a second lens element, a third lens element, a fourth lens element, a diaphragm, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element, a cover, a rear cover and a lens barrel, wherein the first lens element, the second lens element, the third lens element, the fourth lens element, the diaphragm, the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element, the cover, the rear cover and the lens barrel are arranged in sequence from an object side to an image side; The lens comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a diaphragm, a fifth lens element, a seventh lens element and an eighth lens element, wherein the first lens element is a meniscus lens, the second lens element is a meniscus lens, the third lens element is a meniscus lens, the fourth lens element is a biconvex lens, the diaphragm is a diameter for controlling the size of the diaphragm, the fifth lens element is a meniscus lens, the sixth lens element is a plano-convex lens, the seventh lens element is a meniscus lens, and the eighth lens element is a biconvex lens; the mirror surface of the sixth lens element is matched with the object surface of the seventh lens element; The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element and the eighth lens element are all glass lens elements. In some embodiments, the first to eighth lens elements satisfy the following conditional formula ：Nd1≥1.78800,Vd1≥47.50;Nd2≥1.78800,Vd2≥47.50;Nd3≥1.78800,Vd3≥47.50;Nd4≥1.92286,Vd4≥20.88;Nd5≥1.51700,Vd5≥64.20;Nd6≥1.49100,Vd6≥57.40;Nd7≥1.88300,Vd7≥40.50;Nd8≥1.88300,Vd8≥40.50;, respectively, wherein Nd1, nd2, nd3, nd4, nd5, nd6, nd7, nd8 represent d-ray refractive indices of the first, second, third, fourth, fifth, sixth, seventh, eighth lens element materials, respectively, and Vd1, vd2, vd3, vd4, vd5, vd6, vd7, vd8 represent d-ray abbe constants of the first, second, third, fourth, fifth, sixth, seventh, eighth lens element materials, respectively. In some embodiments, a stop is further included, the stop being disposed between the third lens element and the fourth lens element. In some embodiments, the lens further comprises a ninth lens element arranged in