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CN-122018114-A - Optical lens

CN122018114ACN 122018114 ACN122018114 ACN 122018114ACN-122018114-A

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 positive focal power, the object side is provided with a convex surface, the second lens is provided with positive focal power, the object side is provided with a concave surface, the image side is provided with a convex surface, the third lens is provided with positive focal power, the object side is provided with a convex surface, the fourth lens is provided with negative focal power, the fifth lens is provided with focal power, and the sixth lens is provided with negative focal power, wherein the curvature radius R4 of the image side of the second lens and the curvature radius R5 of the object side of the third lens meet the condition that I (R4+R5)/(R4-R5) I <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 target surface, high imaging quality and the like.

Inventors

  • Ren Jiahao
  • CHEN WEIJIAN
  • CHEN XINGXING

Assignees

  • 江西联创电子有限公司

Dates

Publication Date
20260512
Application Date
20241112

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 positive focal power, the object side surface of which is a convex surface; a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a third lens having positive optical power, the object side surface of which is a convex surface; a fourth lens having negative optical power; A fifth lens having optical power; a sixth lens having negative optical power; wherein the image side curvature radius R4 of the second lens and the object side curvature radius R5 of the third lens satisfy | (R4+R5)/(R4-R5) | <1.
  2. 2. The optical lens according to claim 1, wherein the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy 10 ° < FOV/Fno <18 °, and the total optical length TTL of the optical lens, the real image height IH corresponding to the maximum field angle FOV of the optical lens and the maximum field angle of the optical lens satisfy 84<180 ° ×ttl/IH/FOV <135.
  3. 3. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f3 of the third lens satisfy 0.3< f3/f <1.3, and an effective focal length f of the optical lens and an object side radius of curvature R5 of the third lens satisfy R5/f >0.4.
  4. 4. The optical lens as claimed in claim 1, wherein the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy-5.6 < f4/f < -0.5, and the object-side surface radius of curvature R7 of the fourth lens and the image-side surface radius of curvature R8 of the fourth lens satisfy 0.3< R7/R8<8.8.
  5. 5. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a combined focal length f12 of the first lens and the second lens satisfy 1.3< f12/f <5, and an effective focal length f of the optical lens and a combined focal length f3456 of the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy 1.3< f3456/f <3.6.
  6. 6. The optical lens of claim 1, wherein the effective focal length f of the optical lens and the object-side radius of curvature R3 of the second lens satisfy-1 < R3/f < -0.4, and the effective focal length f of the optical lens and the image-side radius of curvature R4 of the second lens satisfy-1.1 < R4/f < -0.5.
  7. 7. The optical lens of claim 1, wherein the second lens element has an image-side radius of curvature R4 and an object-side radius of curvature R5 that satisfy 2.1< R4/R5<0, and wherein the second lens element has an object-side radius of curvature R3 and an object-side radius of curvature R5 that satisfy 1.8< R3/R5<0.
  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-26.7 < (R3+R4)/(R3-R4) < -7.9.
  9. 9. The optical lens of claim 1, wherein the object-side radius of curvature R3 of the second lens and the object-side radius of curvature R5 of the third lens satisfy | (R3+R5)/(R3-R5) | <1.
  10. 10. The optical lens of claim 1, wherein an object-side light-transmitting half-aperture height Sag3 of the second lens and an object-side light-transmitting half-aperture d3 of the second lens meet-0.3 < Sag3/d3< -0.1, an image-side light-transmitting half-aperture height Sag4 of the second lens and an image-side light-transmitting half-aperture d4 of the second lens meet-0.3 < Sag4/d4< -0.1, and an object-side light-transmitting half-aperture height Sag5 of the third lens and an object-side light-transmitting half-aperture d5 of the third lens meet d5/Sag5>3.3.

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 comprising six lenses 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 positive refractive power having a concave object-side surface and a convex image-side surface; a third lens having positive optical power, the object side surface of which is a convex surface; a fourth lens having negative optical power; A fifth lens having optical power; a sixth lens having negative optical power; wherein the image side curvature radius R4 of the second lens and the object side curvature radius R5 of the third lens satisfy | (R4+R5)/(R4-R5) | <1. Further preferably, the maximum field angle FOV of the optical lens and the aperture value FNo of the optical lens satisfy 10 DEG < FOV/FNo <18 DEG, and the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle FOV of the optical lens and the maximum field angle of the optical lens satisfy 84<180 DEG x TTL/IH/FOV <135. Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy 0.3< f3/f <1.3, and the effective focal length f of the optical lens and the object side curvature radius R5 of the third lens satisfy R5/f >0.4. Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens meet-5.6 < f4/f < -0.5, and the object-side surface curvature radius R7 of the fourth lens and the image-side surface curvature radius R8 of the fourth lens meet 0.3< R7/R8<8.8. Further preferably, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy 1.3< f12/f <5, and the effective focal length f of the optical lens and the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfy 1.3< f3456/f <3.6. Further preferably, the effective focal length f of the optical lens and the object side curvature radius R3 of the second lens meet the condition that 1< R3/f < -0.4, and the effective focal length f of the optical lens and the image side curvature radius R4 of the second lens meet the condition that 1.1< R4/f < -0.5. Further preferably, the image side curvature radius R4 of the second lens and the object side curvature radius R5 of the third lens satisfy-2.1 < R4/R5<0, and the object side curvature radius R3 of the second lens and the object side curvature radius R5 of the third lens satisfy-1.8 < R3/R5<0. 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-26.7 < (R3+R4)/(R3-R4) < -7.9. Further preferably, the object-side surface radius of curvature R3 of the second lens and the object-side surface radius of curvature R5 of the third lens satisfy | (R3+R5)/(R3-R5) | <1. Further preferably, the object side light-transmitting half-caliber sagittal height Sag3 of the second lens and the object side light-transmitting half-caliber d3 of the second lens meet the conditions that-0.3 < Sag3/d3< -0.1; the image side light transmission half-caliber sagittal height Sag4 of the second lens and the image side light transmission half-caliber d4 of the second lens meet the conditions that Sag4/d4< -0.1 is below-0.3, and the object side light transmission half-caliber sagittal height Sag5 of the third lens and the object side light transmission half-caliber d5 of the third lens meet the conditions that d5/Sag5 is above 3.3. 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 o