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CN-118642250-B - Optical lens

CN118642250BCN 118642250 BCN118642250 BCN 118642250BCN-118642250-B

Abstract

The invention provides an optical lens which comprises seven 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 convex surface, the image side is a concave surface, the second lens is provided with negative focal power, the object side is a concave surface at a paraxial region, the image side is a concave surface, the third lens is provided with negative focal power, the object side and the image side are both concave surfaces, the fourth lens is provided with positive focal power, the object side is a convex surface, the image side is a concave surface, the fifth lens is provided with positive focal power, the object side and the image side are both convex surfaces, the sixth lens is provided with negative focal power, the object side is a concave surface at a paraxial region, the object side is a convex surface at a paraxial region, and the image side is a convex surface. The optical lens provided by the invention has one or more advantages of large aperture, large field angle, high imaging quality and the like through specific surface shape collocation and reasonable focal power distribution.

Inventors

  • LIU XIN
  • BAO YUMIN
  • WANG KEMIN

Assignees

  • 江西联创电子有限公司

Dates

Publication Date
20260512
Application Date
20240621

Claims (10)

  1. 1. An optical lens comprising seven lenses in total, in order from an object side to an imaging surface along an optical axis, comprising: the first lens with negative focal power has a convex object side surface and a concave image side surface; A second lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface; A third lens having negative optical power, both the object-side surface and the image-side surface of which are concave surfaces; A fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a fifth lens element with positive refractive power having convex object-side and image-side surfaces; A sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface at a paraxial region; a seventh lens element with positive refractive power having a convex object-side surface at a paraxial region and a convex image-side surface; wherein the curvature radius R3 of the second lens object-side surface and the curvature radius R8 of the fourth lens image-side surface satisfy 1.1< (R3-R8)/(R3 + R8) <1.5; 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 the condition that IH/EPD is 6.5< 8.5.
  2. 2. The optical lens as claimed in claim 1, wherein the radius of curvature R3 of the object side surface of the second lens element, the radius of curvature R4 of the image side surface of the second lens element and the center thickness CT2 of the second lens element satisfy-20 < R3/(R4+CT2) < -15.
  3. 3. The optical lens of claim 1, wherein the object-side light-transmitting half-caliber Sag13 of the seventh lens element satisfies 0< Sag13<0.1mm, and the vertical distance YC13 between the object-side inflection point of the seventh lens element and the optical axis satisfies 0.6< YC13/d13<0.8.
  4. 4. The optical lens according to claim 1, wherein a maximum field angle FOV of the optical lens and an aperture value FNO of the optical lens satisfy 95 ° < FOV/FNO is 108.7 °; the curvature radius R3 of the object side surface of the second lens and the curvature radius R8 of the image side surface of the fourth lens are 1.32-1 (R3-R8)/(R3 + R8); 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 are 6.76-7.83.
  5. 5. The optical lens of claim 1, wherein a focal length f3 of the third lens and an effective focal length f of the optical lens satisfy-3.3 < f3/f < -2.7, and a radius of curvature R6 of an image side of the third lens and an effective focal length f of the optical lens satisfy 8< R6/f <9.2.
  6. 6. The optical lens of claim 1, wherein a combined focal length f1234 of the first, second, third and fourth lenses and an effective focal length f of the optical lens satisfy-1.5 < f1234/f < -1.1.
  7. 7. The optical lens of claim 1, wherein the object-side radius of curvature R3 of the second lens and the effective focal length f of the optical lens satisfy-40 < R3/f < -30, and the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy-25 < R3/R4< -15.
  8. 8. The optical lens of claim 1, wherein an image-side curvature radius R8 of the fourth lens and an effective focal length f of the optical lens satisfy 4< R8/f <6, and an image-side light-transmitting half-caliber saggita 8 of the fourth lens and an image-side light-transmitting half-caliber d8 of the fourth lens satisfy 0< Sag8/d8<0.2.
  9. 9. The optical lens of claim 1, wherein the image-side radius of curvature R12 of the sixth lens element and the effective focal length f of the optical lens element satisfy 1.5< R12/f <2.9, and the object-side radius of curvature R11 of the sixth lens element and the image-side radius of curvature R12 of the sixth lens element satisfy-1.2 < R12/R11< -0.2.
  10. 10. The optical lens of claim 1, wherein the object-side radius of curvature R13 of the seventh lens and the effective focal length f of the optical lens satisfy 1.1< R13/f <1.9, and wherein the image-side radius of curvature R14 of the seventh lens and the effective focal length f of the optical lens satisfy-2.2 < R14/f < -1.7.

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. For example, generally, one panoramic lens is mounted in each of the four directions of the front, rear, left and right of the vehicle, and 360 panoramic images around the vehicle body can be provided to the driver by performing processing such as stitching on the images collected by the four panoramic lenses. With the rapid development of advanced driving assistance systems, the requirements for the looking-around 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 seven lenses in order from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object side surface and a concave image side surface; A second lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface; A third lens having negative optical power, both the object-side surface and the image-side surface of which are concave surfaces; A fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a fifth lens element with positive refractive power having convex object-side and image-side surfaces; A sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface at a paraxial region; a seventh lens element with positive refractive power having a convex object-side surface at a paraxial region and a convex image-side surface; Wherein the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy 1.1< (R3-R8)/(R3+R8)<1.5。 Further preferably, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens and the center thickness CT2 of the second lens satisfy-20 < R3/(R4+CT2) < -15. Further preferably, the object-side light-transmitting half-caliber Sag Sag13 of the seventh lens meets the condition that 0< Sag13<0.1mm, and the vertical distance YC13 between the object-side upper inflection point of the seventh lens and the optical axis and the object-side light-transmitting half-caliber d13 of the seventh lens meet the condition that 0.6< YC13/d13<0.8. Further preferably, the maximum field angle FOV of the optical lens and the aperture value FNO of the optical lens satisfy FOV/FNO >95 deg. Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens meet-3.3 < f3/f < -2.7, and the curvature radius R6 of the image side of the third lens and the effective focal length f of the optical lens meet 8< R6/f <9.2. Further preferably, the combined focal length f1234 of the first, second, third and fourth lenses and the effective focal length f of the optical lens meet-1.5 < f1234/f < -1.1. Further preferably, the object-side radius of curvature R3 of the second lens element and the effective focal length f of the optical lens element satisfy-40 < R3/f < -30 >, and the object-side radius of curvature R3 of the second lens element and the image-side radius of curvature R4 of the second lens element satisfy-25 < R3/R4< -15. Further preferably, the image-side curvature radius R8 of the fourth lens element and the effective focal length f of the optical lens element satisfy 4< R8/f <6, and the image-side light-transmitting half-caliber sagittal height Sag8 of the fourth lens element and the image-side light-transmitting half-caliber d8 of the fourth lens element satisfy 0< Sag8/d8<0.2. Further preferably, the image-side radius of curvature R12 of the sixth lens element and the effective focal length f of the optical lens element satisfy 1.5< R12/f <2.9, and the object-side radius of curvature R11 of the sixth lens element and the image-side radius of curvature R12 of the sixth lens element satisfy-1.2 < R12/R11< -0.2. Further preferably, the object-side radius of curvature R13 of the seventh lens element and the effective focal length f of the optical lens el