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CN-224232032-U - Receiving lens

CN224232032UCN 224232032 UCN224232032 UCN 224232032UCN-224232032-U

Abstract

The utility model provides a receiving lens, which belongs to the technical field of optical imaging and comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged along the direction of an optical axis, wherein the object side surfaces and the image side surfaces of the first lens and the fifth lens are rotationally symmetrical aspheric surfaces, the focal power of the five groups of lenses is sequentially negative focal power, positive focal power, negative focal power, positive focal power and positive focal power along the arrangement direction, or the object side surfaces and the image side surfaces of the first lens and the third lens are rotationally symmetrical aspheric surfaces, the focal power of the five groups of lenses is sequentially negative focal power, positive focal power along the arrangement direction, the substrate materials of the five groups of lenses are high-temperature resistant materials, and the receiving lens also meets the set optical parameter conditions. The utility model can simultaneously meet the requirements of large aperture, small size and high resolution capability under the condition of ensuring that the receiving lens meets a large field angle.

Inventors

  • HAN JIAHUI
  • DANG XUWEN
  • WANG LIZHONG

Assignees

  • 江西凤凰光学科技有限公司

Dates

Publication Date
20260512
Application Date
20250522

Claims (10)

  1. 1. The receiving lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged along the optical axis direction; The object side surface and the image side surface of the first lens are both rotationally symmetrical aspheric surfaces, the object side surface and the image side surface of the fifth lens are rotationally symmetrical aspheric surfaces, and the focal power of the five groups of lenses sequentially comprises negative focal power, positive focal power, negative focal power, positive focal power and positive focal power along the arrangement direction; Or the object side surface and the image side surface of the first lens are both rotationally symmetrical aspheric surfaces, the object side surface and the image side surface of the third lens are rotationally symmetrical aspheric surfaces, and the focal power of the five groups of lenses sequentially comprises negative focal power, positive focal power and positive focal power along the arrangement direction; Wherein, the substrate materials of the five groups of lenses are all high temperature resistant materials; The receiving lens also satisfies the following optical parameter conditions: 0.3<|f1/f2|<1.6; 0.3<|f2/f3|<2.5; 0.2<|f3/f4|<2.55; 0.4<|f4/f5|<1.8; 20≤TTL≤25.5; 90°<FOV<120°; wherein f1, f2, f3, f4, f5 are the effective focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens, respectively, TTL is the total optical length of the receiving lens, the unit is millimeter, and FOV is the angle of view of the receiving lens.
  2. 2. The receiving lens of claim 1, further comprising an aperture stop; When the object side surface and the image side surface of the first lens are both rotationally symmetrical aspheric surfaces, the aperture diaphragm is arranged between the first lens and the second lens; when the object side surface and the image side surface of the first lens are both rotationally symmetrical aspheric surfaces, and the object side surface and the image side surface of the third lens are both rotationally symmetrical aspheric surfaces, the aperture stop is arranged between the second lens and the third lens.
  3. 3. The receiving lens of claim 2, wherein the receiving lens satisfies the following optical parameter conditions: 0.45<SL/TTL<0.85; The SL is the distance from the aperture diaphragm to the image plane of the receiving lens, and the unit is millimeter.
  4. 4. The receiving lens of claim 1, wherein the receiving lens satisfies the following optical parameter conditions: 0.125<BFL/TTL<0.195; The BFL is a distance between the image side surface of the fifth lens and the image surface of the receiving lens on the optical axis, and the unit is millimeter.
  5. 5. The receiving lens of claim 1, wherein the receiving lens satisfies the following optical parameter conditions: 13.5°≤θ≤15°; And θ is the maximum chief ray incidence angle of the image plane of the receiving lens.
  6. 6. The receiving lens of claim 1, wherein the receiving lens satisfies the following optical parameter conditions: 2.1≤f≤3.5; f is the total effective focal length of the receiving lens, and the unit is millimeter.
  7. 7. The receiving lens of claim 6, wherein the receiving lens satisfies the following optical parameter conditions: 9≤TTL/IH≤13; IH is the half image height of the target surface of the receiving lens.
  8. 8. The receiving lens of claim 1, wherein the receiving lens satisfies the following optical parameter conditions: 9≤SD1≤10; 4≤SD5≤10; wherein SD1 is the physical caliber of the first lens, SD5 is the physical caliber of the fifth lens, and the unit is millimeter.
  9. 9. The receiving lens of claim 8, wherein the receiving lens satisfies the following optical parameter conditions: 1.15≤Fno≤1.23; Wherein FNo is the aperture size of the receiving lens.
  10. 10. The receiving lens according to any one of claims 1 to 9, wherein an operating band of the receiving lens is 255 nm to 950nm, and a dominant wavelength is 940nm.

Description

Receiving lens Technical Field The utility model relates to the technical field of optical imaging, in particular to a receiving lens. Background In recent years, along with the expansion of the photosensitive area and the improvement of the low-illumination performance of CMOS (Complementary Metal Oxide Semiconductor) image sensors, in combination with the breakthrough progress of the DSP (DIGITAL SIGNAL Processing) digital signal Processing technology, the application of an optical imaging system in the fields of vehicle ADAS (Advanced Driving Assistant System), intelligent security, machine vision and the like presents a development trend of miniaturization, high performance and high speed. Among them, how to ensure that the receiving lens satisfies a large aperture, a small size, and a high resolution in the case of satisfying a large angle of view has become the current research direction. In the design of the existing receiving lens, for example, patent document CN112099193a discloses a small TOF (Time of Flight) lens, a hybrid structure comprising two plastic aspherical lenses and four glass spherical lenses is adopted, the optical total length of the TOF lens is larger, the space utilization rate is insufficient, and the resolution is poor due to the fact that the plastic aspherical lenses are adopted, a larger defocus amount can be generated in a high-temperature environment, for example, patent document CN113311571a discloses a small-volume vehicle-mounted TOF lens, the optical total length of 10mm is realized through five all glass lenses, meanwhile, the distortion is smaller, but the architecture is limited by petzval field curvature correction conditions, and the half field angle is forced to be smaller than 10 degrees. The technical bottleneck causes the prior receiving lens to face the contradiction of 'large view field and small size can not be compatible' and 'high resolution capability and weather resistance are mutually restricted' in the practical application field, thereby severely restricting the application development of the receiving lens. Disclosure of utility model Based on the above, the purpose of the utility model is to provide a receiving lens, which aims to ensure that the receiving lens meets the requirements of large aperture, small size and high resolution capability under the condition of large field angle. In order to achieve the above purpose, the utility model adopts the following technical scheme that the receiving lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged along the direction of an optical axis, wherein the object side surface and the image side surface of the first lens are all rotationally symmetrical aspheric surfaces, the object side surface and the image side surface of the fifth lens are rotationally symmetrical aspheric surfaces, the focal power of the five lens is sequentially negative focal power, positive focal power, negative focal power, positive focal power and positive focal power along the direction of arrangement, or the object side surface and the image side surface of the first lens are rotationally symmetrical aspheric surfaces, the object side surface and the image side surface of the third lens are rotationally symmetrical aspheric surfaces, the focal power of the five lens is sequentially negative focal power, positive focal power and positive focal power along the direction of arrangement, the substrate materials of the five lens are high-temperature resistant materials, and the receiving lens also meets the following optical parameter conditions: 0.3<|f1/f2|<1.6; 0.3<|f2/f3|<2.5; 0.2<|f3/f4|<2.55; 0.4<|f4/f5|<1.8; 20≤TTL≤25.5; 90°<FOV<120°; wherein f1, f2, f3, f4, f5 are the effective focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens, respectively, TTL is the total optical length of the receiving lens, the unit is millimeter, and FOV is the angle of view of the receiving lens. In addition, the receiving lens according to the present utility model may further have the following additional technical features: The receiving lens further comprises an aperture stop, wherein the aperture stop is arranged between the first lens and the second lens when the object side surface and the image side surface of the first lens are both rotationally symmetrical aspheric surfaces, and the aperture stop is arranged between the second lens and the third lens when the object side surface and the image side surface of the third lens are both rotationally symmetrical aspheric surfaces. Further, the receiving lens satisfies the following optical parameter conditions: 0.45<SL/TTL<0.85; The SL is the distance from the aperture diaphragm to the image plane of the receiving lens, and the unit is millimeter. Further, the receiving lens satisfies the following optical parameter conditions: 0.125<BFL/TTL<0.195; The BFL is a distance between the