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CN-118859478-B - Optical lens

CN118859478BCN 118859478 BCN118859478 BCN 118859478BCN-118859478-B

Abstract

The invention provides an optical lens which comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, an object side with convex surface and an image side with concave surface, wherein the object side and the image side of the first lens are concave surfaces, the object side of the third lens with negative focal power is concave, the object side of the fourth lens with positive focal power is concave, the image side of the fourth lens with positive focal power is convex, the object side of the fifth lens with negative focal power is convex, and the image side of the fifth lens with negative focal power is concave, and the maximum field angle FOV and the aperture value FNO of the optical lens meet 52.4 degrees < FOV/FNO <67.3 degrees. The optical lens provided by the invention can improve the imaging quality of the optical lens, reduce the aberration and improve the imaging quality of the optical lens, so that the lens has one or more advantages of miniaturization, large aperture, large field angle, high imaging quality and the like.

Inventors

  • Li Zhaochenxi
  • YANG RUI
  • WEI WENZHE

Assignees

  • 江西联创电子有限公司

Dates

Publication Date
20260512
Application Date
20240830

Claims (11)

  1. 1. An optical lens comprising five lenses in order from an object side to an imaging surface along an optical axis, comprising: A first lens having negative optical power, both the object-side surface and the image-side surface of which are concave surfaces; a second lens having positive optical power; a third lens with negative focal power, the object side surface of which is a concave surface; a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; wherein the maximum field angle FOV and aperture value FNO of the optical lens satisfy 52.4 DEG < FOV/FNO <67.3 DEG; The real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens and the maximum field angle FOV of the optical lens satisfy 0.9< (IH/2)/(f×tan (FOV/2)) <1.
  2. 2. The optical lens according to claim 1, wherein the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy 1.9< TTL/f <2.7.
  3. 3. The optical lens of claim 1, wherein the maximum field angle FOV and aperture value FNO of the optical lens satisfies 58.27 ° < FOV/FNO <61.21 °; The real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens and the maximum field angle FOV of the optical lens satisfy 0.91< (IH/2)/(f×tan (FOV/2)) <0.99.
  4. 4. The optical lens of claim 1, wherein a real image height IH corresponding to a maximum field angle of the optical lens and an entrance pupil diameter EPD of the optical lens satisfy 1.1< IH/EPD <1.5.
  5. 5. The optical lens as claimed in claim 1, wherein the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy-13.6 < f3/f < -2.8, and the effective focal length f of the optical lens and the object side curvature radius R5 of the third lens satisfy-16.2 < R5/f < -1.4.
  6. 6. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy 1.6< f4/f <3.6, and an object-side radius of curvature R7 of the fourth lens and an image-side radius of curvature R8 of the fourth lens satisfy 1.5< R7/R8<2.3.
  7. 7. The optical lens of claim 1, wherein a combined focal length f12 of the first lens and the second lens and a combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy 0.01< f12/f345<0.9.
  8. 8. The optical lens of claim 1, wherein the effective focal length f of the optical lens and the object-side radius of curvature R7 of the fourth lens satisfy-3.1 < R7/f < -0.8.
  9. 9. The optical lens of claim 1, wherein the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy 0.05< R3/R4 +. 2809.50, and the second lens is a meniscus lens.
  10. 10. The optical lens of claim 1, wherein an object-side light-transmitting half-caliber Sag7 of the fourth lens and an object-side light-transmitting half-caliber d7 of the fourth lens meet-0.3 < Sag7/d7< -0.01, and an image-side light-transmitting half-caliber Sag8 of the fourth lens and an image-side light-transmitting half-caliber d8 of the fourth lens meet-0.4 < Sag8/d8< -0.1.
  11. 11. The optical lens of claim 1, wherein an object-side radius of curvature R9 of the fifth lens, an image-side radius of curvature R10 of the fifth lens and a center thickness CT5 of the fifth lens satisfy 0.7< R9/(R10+CT5) <1.1.

Description

Optical lens Technical Field The invention relates to the technical field of imaging lenses, in particular to an optical lens. Background Today, lidar is widely used for detecting three-dimensional coordinates of objects and ranging. The laser radar comprises a controller, a light source and a receiving device, wherein the controller is used for controlling the light source to emit light beams, the light beams are diffusely reflected after encountering a target object, the receiving device is used for receiving reflected light beams, and relevant information of the target object, such as parameters of target distance, azimuth, height, speed, gesture, even shape and the like, is determined according to the emitted light beams and the reflected light beam information. The laser radar is widely applied to automatic driving automobiles, unmanned aerial vehicles, autonomous robots, satellites, rockets and the like. The optical lens is used as a key part of the laser radar, can receive and process reflected light reflected back, has the problem of low imaging quality and cannot meet market demands. Disclosure of Invention In view of the foregoing, an object of the present invention is to provide an optical lens having an advantage of excellent imaging quality. The invention adopts the technical scheme that: an optical lens comprising five lenses in order from an object side to an imaging surface along an optical axis: A first lens having negative optical power, both the object-side surface and the image-side surface of which are concave surfaces; a second lens having positive optical power; a third lens with negative focal power, the object side surface of which is a concave surface; a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; wherein the maximum field angle FOV and aperture value FNO of the optical lens satisfy 52.4 DEG < FOV/FNO <67.3 deg. Further preferably, the optical total length TTL of the optical lens and the effective focal length f of the optical lens meet 1.9< TTL/f <2.7. Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens and the maximum field angle FOV of the optical lens satisfy 0.9< (IH/2)/(f×tan (FOV/2)) <1. Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy 1.1< IH/EPD <1.5. Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens meet the condition that 13.6< f3/f < -2.8, and the effective focal length f of the optical lens and the object side surface curvature radius R5 of the third lens meet the condition that 16.2< R5/f < -1.4. Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy 1.6< f4/f <3.6, and the object-side curvature radius R7 of the fourth lens and the image-side curvature radius R8 of the fourth lens satisfy 1.5< R7/R8<2.3. Further preferably, the combined focal length f12 of the first lens and the second lens and the combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy 0.01< f12/f345<0.9. Further preferably, the effective focal length f of the optical lens and the object side curvature radius R7 of the fourth lens satisfy-3.1 < R7/f < -0.8. Further preferably, the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy R3/R4>0.05, and the second lens is a meniscus lens. Further preferably, the object-side light-transmitting half-caliber rise Sag7 of the fourth lens and the object-side light-transmitting half-caliber d7 of the fourth lens meet the condition that the object-side light-transmitting half-caliber rise Sag8 of the fourth lens and the object-side light-transmitting half-caliber d8 of the fourth lens meet the condition that the object-side light-transmitting half-caliber of the fourth lens meets the object-side light-transmitting half-caliber of the fourth lens. Further preferably, the object-side radius of curvature R9 of the fifth lens, the image-side radius of curvature R10 of the fifth lens and the center thickness CT5 of the fifth lens satisfy 0.7< R9/(R10+CT5) <1.1. The optical lens provided by the invention adopts five lenses with specific focal power, and can improve the imaging quality of the optical lens, reduce the aberration and improve the imaging quality of the optical lens through specific surface shape collocation and reasonable focal power distribution, so that the lens has one or more advantages of miniaturization, large aperture, large field angle, high imaging quality and the like. Drawings The foregoing and/or additi