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CN-122018116-A - Optical lens

CN122018116ACN 122018116 ACN122018116 ACN 122018116ACN-122018116-A

Abstract

The invention provides an optical lens, which comprises six lenses with optical power, a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power and a sixth lens with positive optical power, wherein the first lens with positive optical power, the object side of the first lens is a convex surface, the object side of the second lens with negative optical power is a concave surface, the image side of the second lens is a concave surface, the object side of the third lens with positive optical power is a convex surface, the image side of the third lens with positive optical power is a convex surface, the object side of the fourth lens with positive optical power is a convex surface, the fifth lens with negative optical power and the sixth lens with positive optical power are arranged in sequence from the object side to the imaging surface along an optical axis, the focal length f6 of the sixth lens and the effective focal length f of the optical lens are 1< f6/f <5, and the curvature radius R4 of the image side of the second lens and the effective focal length f of the optical lens are 0.65< R4/f <2.2. The optical lens provided by the invention has one or more advantages of long focus, large aperture, high imaging quality and the like through specific surface shape collocation and reasonable focal power distribution.

Inventors

  • CUI KEXIN

Assignees

  • 合肥联创光学有限公司

Dates

Publication Date
20260512
Application Date
20251204

Claims (10)

  1. 1. An optical lens having six lenses in number of optical power, characterized by comprising, in order from an object side to an imaging surface along an optical axis: a first lens with positive focal power, the object side surface of which is a convex surface; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; a fourth lens with positive focal power, the object side surface of which is a convex surface; A fifth lens having negative optical power; a sixth lens having positive optical power; the focal length f6 of the sixth lens and the effective focal length f of the optical lens meet 1< f6/f <5, and the image side curvature radius R4 of the second lens and the effective focal length f of the optical lens meet 0.65< R4/f <2.2.
  2. 2. 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 f36 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfy-4.2 < f12/f36< -1.2.
  3. 3. The optical lens of claim 1, wherein an object-side light-transmitting half-diameter d1 of the first lens and an image-side light-transmitting half-diameter d12 of the sixth lens satisfy 1.2< d1/d12<2.9.
  4. 4. The optical lens system according to claim 1, wherein the object-side light-transmitting half-caliber sagittal height SAG3 of the sixth lens, the image-side light-transmitting half-caliber sagittal height SAG4 of the sixth lens and the center thickness CT2 of the sixth lens satisfy 0.2< (SAG 4-SAG 3)/CT 2<2.5.
  5. 5. The optical lens of claim 1, wherein the total optical length TTL of the optical lens, the real image height IH of the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy 0.1/° < TTL/IH/FOV <0.3/°.
  6. 6. The optical lens according to claim 1, wherein a real image height IH corresponding to a maximum field angle of the optical lens, an effective focal length f of the optical lens, and a maximum field angle FOV of the optical lens satisfy 50 ° < f x FOV/IH <60 °.
  7. 7. The optical lens of claim 1, wherein a focal length f5 of the fifth lens and a focal length f6 of the sixth lens satisfy-0.6 < f5/f6< -0.1.
  8. 8. 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-2.9 < R3/R4< -0.55.
  9. 9. The optical lens of claim 1, wherein the object-side light-passing half-caliber sagittal height SAG11 of the sixth lens, the image-side light-passing half-caliber sagittal height SAG12 of the sixth lens and the center thickness CT6 of the sixth lens satisfy-0.1 < (SAG 12-SAG 11)/CT 6<0.1.
  10. 10. The optical lens of claim 1, wherein the object-side radius of curvature R11 of the sixth lens and the image-side radius of curvature R12 of the sixth lens satisfy-0.4 < (R11-R12)/(R11+R12) <1.1.

Description

Optical lens Technical Field The invention relates to the technical field of imaging lenses, in particular to an optical lens. Background Along with the continuous improvement of the requirements of people on driving experience, the vehicle-mounted application optical lens is increasingly used in intelligent driving, and the position of the vehicle-mounted optical lens in the related industries of automobiles is continuously improved. Advanced Driving Assistance Systems (ADASs) play an important role in intelligent driving, and collect environmental information through various lenses in combination with sensors to ensure driving safety of drivers. In addition to the light, thin, short, small, and high-pixel and high-resolution characteristics of the conventional ADAS system lens, the optical lens is required to be capable of clearly imaging under a low-illuminance condition, so that it is required to develop an optical lens with 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 having six lenses of optical power, comprising, in order from an object side to an imaging surface along an optical axis: a first lens with positive focal power, the object side surface of which is a convex surface; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; a fourth lens with positive focal power, the object side surface of which is a convex surface; A fifth lens having negative optical power; a sixth lens having positive optical power; the focal length f6 of the sixth lens and the effective focal length f of the optical lens meet 1< f6/f <5, and the image side curvature radius R4 of the second lens and the effective focal length f of the optical lens meet 0.65< R4/f <2.2. Further preferably, the combined focal length f12 of the first lens and the second lens and the combined focal length f36 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfy-4.2 < f12/f36< -1.2. Further preferably, the object-side light-transmitting half aperture d1 of the first lens and the image-side light-transmitting half aperture d12 of the sixth lens satisfy 1.2< d1/d12<2.9. Further preferably, the object-side light-transmitting half-caliber sagittal height SAG3 of the sixth lens, the image-side light-transmitting half-caliber sagittal height SAG4 of the sixth lens and the center thickness CT2 of the sixth lens satisfy 0.2< (SAG 4-SAG 3)/CT 2<2.5. Further preferably, the total optical length TTL of the optical lens, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens meet 0.1/° and the total optical length TTL/IH/FOV is less than 0.3/°. 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 50 DEG < f X FOV/IH <60 deg. Further preferably, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy-0.6 < f5/f6< -0.1. 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-2.9 < R3/R4< -0.55. Further preferably, the object-side light-transmitting half-caliber sagittal height SAG11 of the sixth lens, the image-side light-transmitting half-caliber sagittal height SAG12 of the sixth lens and the center thickness CT6 of the sixth lens satisfy-0.1 < (SAG 12-SAG 11)/CT 6<0.1. Further preferably, the object-side radius of curvature R11 of the sixth lens and the image-side radius of curvature R12 of the sixth lens satisfy-0.4 < (R11-R12)/(R11+R12) <1.1. The optical lens provided by the invention adopts six 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 long focus, large aperture, high imaging quality and the like. Drawings The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which: fig. 1 is a schematic structural diagram of an optical lens in embodiment 1 of the present invention. Fig. 2 is a graph showing a field curvature of an optical lens in embodiment 1 of the present invention. Fig. 3 is a distortion curve of F-Tan (Theta) of the optical lens in embodiment 1 of th