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CN-121978819-A - Infrared lens, infrared camera and night vision traffic system

CN121978819ACN 121978819 ACN121978819 ACN 121978819ACN-121978819-A

Abstract

The application relates to an infrared lens, an infrared camera and a night vision traffic system, which belong to the field of optical lenses, and are sequentially provided with a first lens, a second lens and a third lens along an optical axis from an object plane to an image plane, wherein the first lens is an aspheric lens, one of the second lens and the third lens is a super-surface lens, and the other lens is an aspheric lens. The application reduces the volume and weight of the lens of the optical system by utilizing the technical scheme of the super surface, is convenient to integrate into a night vision traffic system, and realizes miniaturization, light weight and integrated design.

Inventors

  • WANG JIAOJIAO
  • LI XINGYI
  • XING YUANYUAN
  • GONG YONGXING

Assignees

  • 杭州纳境科技有限公司

Dates

Publication Date
20260505
Application Date
20260227
Priority Date
20250616

Claims (10)

  1. 1. The infrared lens is characterized in that a first lens, a second lens and a third lens are sequentially arranged from an object plane to an image plane along an optical axis, wherein the first lens is an aspheric lens, one of the second lens and the third lens is an ultra-surface lens, and the other lens is an aspheric lens; the infrared lens satisfies the following conditions: ; Wherein, the Is the thickness of the substrate of the super surface lens, For the total length of the optical system, Is the radius of curvature of the first surface of the first lens, Is the center thickness of the first lens; Is the radius of curvature of the first surface of the other aspherical lens, Is the center thickness of the aspherical lens.
  2. 2. The infrared lens as set forth in claim 1, wherein the first lens is a lens having positive optical power, an object side surface of the first lens is convex, and both an object side surface and an image side surface of the first lens are aspherical.
  3. 3. The infrared lens assembly of claim 1, wherein the aspheric lenses of the second and third lenses are positive focal power lenses having a convex object-side surface and a concave image-side surface, and wherein the aspheric lenses of the second and third lenses have a microstructure array on the image-side surface and a planar object-side surface.
  4. 4. An infrared lens as set forth in claim 3, wherein the second lens is a super surface lens and the third lens is an aspherical lens.
  5. 5. The infrared lens as claimed in claim 1, wherein a distance TTL from an optical axis center of the object side of the first lens element to an image plane is as follows: 。
  6. 6. The infrared lens of claim 1, further comprising a diaphragm positioned behind the first lens.
  7. 7. An infrared lens according to claim 1, wherein the F-number of the infrared lens satisfies the following condition 1.1。
  8. 8. An infrared lens as claimed in claim 1, wherein the relative illuminance of the infrared lens satisfies the following condition The angle of view satisfies 。
  9. 9. The infrared camera is characterized by comprising the infrared lens of any one of claims 1-8.
  10. 10. Night vision traffic system, characterized in that it comprises an infrared camera according to claim 9.

Description

Infrared lens, infrared camera and night vision traffic system Technical Field The invention belongs to the field of optical lenses, and particularly relates to an infrared lens and a night vision traffic system. Background Night vision traffic technology refers to technology that enhances visibility and improves traffic safety and efficiency by technical means at night or in low light environments. It utilizes various sensors and imaging techniques to help drivers, traffic management systems and monitoring devices clearly identify roads, vehicles, pedestrians and other obstacles in the event of insufficient light. Night vision traffic technologies include active infrared night vision and passive infrared night vision (thermal imaging). Active infrared night vision refers to the use of an infrared light source to illuminate a target, and the use of an infrared camera to capture reflected light to generate a visible image, which is commonly used in traffic monitoring and vehicle-mounted night vision systems. Passive infrared night vision (thermal imaging) refers to the use of infrared radiation emitted by an object itself, the generation of an image by a thermal imager, the display of temperature differences, which is commonly applied to the detection of heat-generating objects such as pedestrians and animals, and is suitable for use in a matt environment. Night vision traffic systems are comprised of a number of key components that cooperate together to promote traffic safety and efficiency in night or low light environments. The main components include an infrared light source, an infrared camera, a thermal imager, a high-sensitivity sensor, an image processing unit, a display device, a communication module and the like. The long-wave infrared imaging lens is a key component of a night vision traffic system, the traditional long-wave infrared imaging lens generally adopts a three-piece type or four-piece type lens group, and adopts a "+, -, +" structure (namely a positive lens, a negative lens and a positive lens combination) to realize aberration correction and thermal stability, but the materials and the processing cost are higher, the volume and the weight are larger, and the design complexity is high. Disclosure of Invention The application provides an infrared lens and a night vision traffic system, which at least solve the technical problems in the prior art. The first aspect of the embodiment of the application provides an infrared lens, which is provided with a first lens, a second lens and a third lens in sequence from an object plane to an image plane along an optical axis, wherein the first lens is an aspheric lens, one of the second lens and the third lens is an ultra-surface lens, and the other lens is an aspheric lens; the infrared lens satisfies the following conditions: ; Wherein, the Is the thickness of the substrate of the super surface lens,For the total length of the optical system,Is the radius of curvature of the first surface of the first lens,Is the center thickness of the first lens; Is the radius of curvature of the first surface of the other aspherical lens, Is the center thickness of the aspherical lens. In one embodiment, the first lens is a lens with positive optical power, the object side surface of the first lens is a convex surface, and the object side surface and the image side surface of the first lens are aspheric surfaces. In an embodiment, the aspheric lenses in the second lens element and the third lens element are lenses with positive focal power, the object-side surface is convex, the image-side surface is concave, and the object-side surface and the image-side surface are aspheric, and the ultra-surface lenses in the second lens element and the third lens element have microstructure arrays on the image-side surfaces and the object-side surface is plane. In one embodiment, the second lens is a super surface lens and the third lens is an aspherical lens. In an embodiment, a distance TTL from an optical axis center of the first lens object-side surface to an image plane is as follows:。 in one embodiment, the lens further comprises a diaphragm positioned behind the first lens. In one embodiment, the infrared lens has an F number that satisfies1.1。 In one embodiment, the relative illuminance of the infrared lens satisfiesThe angle of view satisfies; The second aspect of the embodiment of the application provides an infrared camera, which comprises any one of the infrared lenses. A third aspect of the embodiments of the present application provides a night vision traffic system, including any one of the above-mentioned infrared cameras. Drawings Fig. 1 is a schematic structural diagram of an infrared lens in embodiments 1 and 2 of the present application; FIG. 2 is a schematic view of the MTF of the infrared lens in embodiment 1 of the present application; FIG. 3 is a schematic view of diffuse speckles of an infrared lens in embodiment 1 of the present application; FIG