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CN-118671937-B - Optical lens

CN118671937BCN 118671937 BCN118671937 BCN 118671937BCN-118671937-B

Abstract

The invention discloses an optical lens, which sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with positive focal power, a seventh lens with negative focal power, a concave object side and a concave image side, from an object side to an imaging surface along an optical axis. According to the invention, seven lenses are adopted, through specific surface shape arrangement and reasonable focal power distribution, and particularly, the first lens and the second lens adopt negative focal power, so that the optical lens can collect a large range of light rays, the view angle of the optical lens is improved, meanwhile, the optical lens is provided with larger positive distortion, the edge view field occupation ratio can be effectively improved, and the angular resolution of the edge view field is improved.

Inventors

  • LONG LEI
  • CHEN WEIJIAN
  • WANG KEMIN

Assignees

  • 江西联创电子有限公司

Dates

Publication Date
20260512
Application Date
20240628

Claims (13)

  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: A first lens having negative optical power, the image side surface of which is concave; a second lens having negative optical power; 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 having positive optical power; a fifth lens having positive optical power; a sixth lens having positive optical power; a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface; Wherein the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens meet 1.0< (R5-R6)/(R5 + R6) is less than or equal to 3.72; The radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens meet that 1.0< | (R13-R14)/(R13+R14) | is less than or equal to 2.71; the 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 value theta of the maximum half field angle of the optical lens meet the conditions that (IH/2)/(fxtheta) is less than or equal to 1.21 and less than or equal to 1.30; The maximum field angle FOV of the optical lens and the aperture value FNO of the optical lens satisfy 70 DEG < FOV/FNO <95 deg.
  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 12.0< TTL/f <26.0.
  3. 3. The optical lens according to claim 1, wherein an image height IH of the optical lens, corresponding to the maximum field angle of the optical lens, is satisfied with 3.80< TTL/IH <7.0.
  4. 4. The optical lens according to claim 1, wherein an image height IH corresponding to a maximum field angle of the optical lens, an effective focal length f of the optical lens and an radian value θ of a maximum half field angle of the optical lens satisfy 1.21≤IH/2)/(fxθ≤1.26.
  5. 5. The optical lens of claim 1, wherein a maximum field angle FOV of the optical lens and an aperture value FNO of the optical lens satisfy 72.73 ° -FOV/FNO-93.6 °.
  6. 6. The optical lens according to claim 1, wherein an image height IH corresponding to a maximum field angle of the optical lens and an effective focal length f of the optical lens satisfy 3.2< IH/f≤4.17.
  7. 7. The optical lens according to claim 1, wherein the effective focal length f between the optical back focal length BFL of the optical lens and the optical lens is 1.5< BFL/f≤2.48.
  8. 8. The optical lens of claim 1, wherein a real image height IHm corresponding to half of a value of a maximum field angle of the optical lens and an image height IH corresponding to the maximum field angle of the optical lens satisfy that 0.42 is equal to or less than IHm/IH <0.49.
  9. 9. The optical lens of claim 1, wherein the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy-10.68≤f1/f < -2.5.
  10. 10. The optical lens of claim 1, wherein the effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy-10.09≤f2/f < -3.2.
  11. 11. The optical lens as claimed in claim 1, wherein an effective focal length f3 of the third lens and an effective focal length f of the optical lens satisfy 4.5< f 3/f≤7.52.
  12. 12. The optical lens as claimed in claim 1, wherein an effective focal length f4 of the fourth lens and an effective focal length f of the optical lens satisfy 30.0< f 4/f≤ 830.17; The radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens are 1.02-R6)/(R5+R6) to 3.72; the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy 1.01 < 2.71 (R13-R14)/(R13+R14).
  13. 13. The optical lens according to claim 1, wherein a sum Σct of an optical total length TTL of the optical lens and center thicknesses of the first lens to the seventh lens along an optical axis, respectively, satisfies 0.35< Σct/TTL <0.75.

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. The side view lens of the existing ADAS system is required to be provided with a plurality of lenses on two sides of a vehicle body to realize view angle fusion, and the problem that imaging quality is poor and obstacles cannot be clearly distinguished exists at the edge of a view field. Disclosure of Invention Therefore, the invention aims to provide the optical lens which has at least the advantages of large field angle and good edge field imaging effect. The invention provides an optical lens, which sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with positive focal power, a seventh lens with negative focal power, wherein the object side of the third lens is a concave surface, the image side of the third lens is a convex surface, the fourth lens with positive focal power is a fifth lens with positive focal power, and the seventh lens with negative focal power is a concave surface. In some embodiments, the maximum field angle FOV of the optical lens satisfies 150 ° < FOV. In some embodiments, the aperture value FNO of the optical lens satisfies 2.0< FNO <2.30. In some embodiments, the angle of incidence CRA of the maximum field angle chief ray of the optical lens on the image plane satisfies 12 ° < CRA <40 °. In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy 12.0< TTL/f <26.0. In some embodiments, the total optical length TTL of the optical lens and the image height IH corresponding to the maximum field angle of the optical lens satisfy 3.80< TTL/IH <7.0. In some embodiments, the 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 value θ of the maximum half field angle of the optical lens satisfy 1.20< (IH/2)/(f×θ). Preferably, the 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 value theta of the maximum half field angle of the optical lens satisfy that (IH/2)/(fxtheta) <1.30 is less than or equal to 1.21. In some embodiments, the maximum field angle FOV of the optical lens and the aperture value FNO of the optical lens satisfy 70 DEG < FOV/FNO <95 deg. In some embodiments, the image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy 3.2< IH/f. In some embodiments, the optical back focal length, BFL, of the optical lens and the effective focal length, f, of the optical lens satisfy 1.5< BFL/f. In some embodiments, the real image height IHm corresponding to the optical lens center field angle (which is half the value of the maximum field angle) and the image height IH corresponding to the optical lens maximum field angle satisfy IHm/IH <0.49. Preferably, the real image height IHm corresponding to the center angle of view of the optical lens (the value is half of the value of the maximum angle of view) and the image height IH corresponding to the maximum angle of view of the optical lens satisfy IHm/IH is less than or equal to 0.44. In some embodiments, the effective focal length f1 of the first lens and the effective focal length f of the optical lens satisfy f1/f < -2.5. In some embodiments, the effective focal length f2 of the second lens and the effective focal length f of the optical lens satisfy f2/f < -3.2. In some embodiments, the effective focal length f3 of the third lens and the effective focal length f of the optical lens satisfy 4.5< f3/f. In some embodiments, the effective focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy 30.0< f4/f. In some embodiments, the effective focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy 2.2< f5/f. In some embodiments, the effective focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy 2.0< f6/f. In some embodiments, the effective focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy f7/f < -2.0. In some embodiments, the