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CN-118671928-B - Optical lens

CN118671928BCN 118671928 BCN118671928 BCN 118671928BCN-118671928-B

Abstract

The invention provides an optical lens which comprises six lenses in sequence from an object side to an imaging surface along an optical axis, wherein the first lens is provided with negative focal power, the object side is a concave surface, the second lens is provided with positive focal power, the object side is a concave surface, the image side is a convex surface, the third lens is provided with positive focal power, the object side is a concave surface, the image side is a convex surface, the fourth lens is provided with negative focal power, the object side and the image side are both concave surfaces, the fifth lens is provided with positive focal power, the object side and the image side are both convex surfaces, and the sixth lens is provided with negative focal power. The optical lens provided by the invention has one or more advantages of low cost, high resolution, high imaging quality and the like through specific surface shape collocation and reasonable focal power distribution.

Inventors

  • Xiao Pulu
  • WEI WENZHE
  • WANG KEMIN

Assignees

  • 江西联创电子有限公司

Dates

Publication Date
20260512
Application Date
20240628

Claims (10)

  1. 1. An optical lens comprising six lenses in order from an object side to an imaging surface along an optical axis, comprising: A first lens with negative focal power, the object side surface of which is a concave surface; a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; A fourth lens element having negative optical power, both the object-side and image-side surfaces thereof being concave; a fifth lens element with positive refractive power having convex object-side and image-side surfaces; a sixth lens having negative optical power; Wherein, the curvature radius R10 of the image side surface of the fifth lens and the focal length f5 of the fifth lens meet 13< R10/f5< -0.5; The combined focal length f12 of the first lens and the second lens and the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfy 0.1< f12/f3456<0.8; 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 meet 1.8< IH/EPD <2.5.
  2. 2. The optical lens according to claim 1, wherein the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy-4.5 < f1/f < -1.5.
  3. 3. The optical lens of claim 1, wherein the radius of curvature R10 of the image-side surface of the fifth lens and the focal length f5 of the fifth lens satisfy-11.3 < R10/f5< -1.3; The combined focal length f12 of the first lens and the second lens and the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfy 0.17< f12/f3456<0.52; 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 meet 1.9< IH/EPD <2.2.
  4. 4. The optical lens of claim 1, wherein the radius of curvature R3 of the object-side surface of the second lens and the effective focal length f of the optical lens satisfy-10.2 < R3/f < -6.8, and the radius of curvature R4 of the image-side surface of the second lens and the effective focal length f of the optical lens satisfy-1.3 < R4/f < -0.9.
  5. 5. The optical lens of claim 1, wherein the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy 5.8< R3/R4<8.3.
  6. 6. The optical lens assembly of claim 1, wherein the radius of curvature R3 of the object-side surface of the second lens element and the focal length f2 of the second lens element satisfy-6.5 < R3/f2< -4.4, and the radius of curvature R4 of the image-side surface of the second lens element and the focal length f2 of the second lens element satisfy-0.9 < R4/f2< -0.6.
  7. 7. The optical lens of claim 1, wherein the radius of curvature R5 of the third lens element and the focal length f3 of the third lens element satisfy-4.9 < R5/f3< -3.1, and the radius of curvature R7 of the fourth lens element and the focal length f4 of the fourth lens element satisfy 2.8< R7/f4<10.2.
  8. 8. The optical lens according to claim 1, wherein 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 radian θ of the maximum half field angle of the optical lens satisfy 0.90< (IH/2)/(f x θ) <1.00.
  9. 9. The optical lens of claim 1, wherein the light-transmitting half-aperture d3 of the second lens object-side surface and the light-transmitting half-aperture sagittal height Sag3 of the second lens object-side surface satisfy-0.2 < Sag3/d3<0, and the light-transmitting half-aperture d4 of the second lens image-side surface and the light-transmitting half-aperture sagittal height Sag4 of the second lens image-side surface satisfy-0.3 < Sag4/d4<0.
  10. 10. The optical lens of claim 1, wherein a center thickness CT2 of the second lens and a center thickness CT6 of the sixth lens satisfy 5.9< CT2/CT6<9.1.

Description

Optical lens Technical Field The invention relates to the technical field of imaging lenses, in particular to an optical lens. Background In modern automotive technology, vehicle cameras play a vital role. They include multiple types of cameras, such as inward looking, rearward looking, forward looking, side looking, and around looking cameras, each with its unique application scenario. For example, the rearview camera is mainly used for reversing images, and the looking-around camera provides 360-degree panoramic view, so that the perception capability of a driver is greatly enhanced. Among the vehicle-mounted cameras, a front-view camera is a core component of an ADAS (advanced driving assistance system), which is generally mounted on a front windshield, and is mainly responsible for forward collision early warning, lane departure warning, pedestrian detection, and the like. Currently, the price of a front-view camera is usually far higher than that of other types of cameras due to the complex algorithm and chip processing involved, which also reflects the importance of the front-view camera in a vehicle-mounted camera system. With the rapid development of advanced driving assistance systems, the requirements for the front view lens are also increasing. Therefore, it is necessary to develop an optical lens having a good imaging effect. 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 six lenses in order from an object side to an imaging surface along an optical axis: A first lens with negative focal power, the object side surface of which is a concave surface; a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; A fourth lens element having negative optical power, both the object-side and image-side surfaces thereof being concave; a fifth lens element with positive refractive power having convex object-side and image-side surfaces; a sixth lens having negative optical power; The curvature radius R10 of the image side surface of the fifth lens and the focal length f5 of the fifth lens meet 13R 10/f5< -0.5. Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy-4.5 < f1/f < -1.5. Further preferably, the combined focal length f12 of the first lens and the second lens and the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfy 0.1< f12/f3456<0.8. Further preferably, the radius of curvature R3 of the object side surface of the second lens and the effective focal length f of the optical lens meet the condition that R3/f < -6.8 is less than 10.2, and the radius of curvature R4 of the image side surface of the second lens and the effective focal length f of the optical lens meet the condition that R4/f < -0.9 is less than 1.3. Further preferably, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy 5.8< R3/R4<8.3. Further preferably, the radius of curvature R3 of the object side surface of the second lens and the focal length f2 of the second lens meet the condition that R3/f2< -4.4 is 6.5, and the radius of curvature R4 of the image side surface of the second lens and the focal length f2 of the second lens meet the condition that R4/f2< -0.6 is 0.9. Further preferably, the radius of curvature R5 of the object side of the third lens and the focal length f3 of the third lens meet-4.9 < R5/f3< -3.1, and the radius of curvature R7 of the object side of the fourth lens and the focal length f4 of the fourth lens meet-2.8 < R7/f4<10.2. 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 radian theta of the maximum half field angle of the optical lens satisfy 0.90< (IH/2)/(f x theta) <1.00. Further preferably, the light transmission half-caliber d3 of the second lens object side surface and the light transmission half-caliber sagittal height Sag3 of the second lens object side surface meet the condition that the ratio of-0.2 < Sag3/d3<0, and the light transmission half-caliber d4 of the second lens image side surface and the light transmission half-caliber sagittal height Sag4 of the second lens image side surface meet the condition that the ratio of-0.3 < Sag4/d4<0. Further preferably, the center thickness CT2 of the second lens and the center thickness CT6 of the sixth lens satisfy 5.9< CT2/CT6<9.1. The optical lens provided by the invention adopts six lenses with specific focal power, and can improve the i