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CN-118671930-B - Optical lens

CN118671930BCN 118671930 BCN118671930 BCN 118671930BCN-118671930-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 object side of the first lens is a convex surface, the image side of the first lens is a concave surface, the second lens is a negative optical power, the third lens is a positive optical power, the fourth lens is a negative optical power, the fifth lens is a convex surface, the image side of the fifth lens is a positive optical power, the sixth lens is a positive optical power, the seventh lens is a negative optical power, the sixth lens is provided with a meniscus, and the radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens meet the conditions that R11-R12)/(R11+R12) is less than or equal to 0.97. The optical lens has a large field angle and high resolution through reasonable configuration of the lens surfaces and reasonable collocation of optical power, has good imaging quality and clear edge field imaging.

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 (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 having negative optical power; A third lens having positive optical power; a fourth lens having negative optical power; A fifth lens having positive optical power, an image side surface of which is convex; a sixth lens having positive optical power; a seventh lens having negative optical power; Wherein the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens are equal to or less than-0.99 and less than or equal to (R11-R12)/(R11 + R12) and less than or equal to 0.97; The effective focal length f of the optical lens, the real image height IH corresponding to the maximum field angle and the radian theta of the maximum half field angle meet the conditions that 1.28 is more than or equal to (IH/2)/(fxtheta) is more than or equal to 1.2; The maximum field angle FOV of the optical lens and the aperture value FNo of the optical lens meet 70 DEG < FOV/FNo <110 DEG; The effective focal length f of the optical lens and the focal length f4 of the fourth lens are up to-5002.24 and less than or equal to f4/f < -13.
  2. 2. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy 2< f5/f <4, and an effective focal length f of the optical lens and a focal length f6 of the sixth lens satisfy 2< f6/f <12.
  3. 3. The optical lens of claim 1, wherein the maximum field angle FOV of the optical lens satisfies 190 ∈fov >150 °.
  4. 4. The optical lens of claim 1, wherein a diaphragm is disposed between the third lens and the fourth lens, and a light-transmitting half-aperture of a surface behind the diaphragm is a minimum value among light-transmitting half-apertures of all lenses.
  5. 5. The optical lens of claim 1, wherein the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy-10 < f7/f < -1.
  6. 6. The optical lens according to claim 1, wherein the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy that 4.24 is equal to or greater than IH/f >3.
  7. 7. The optical lens of claim 1, wherein a real image height IH corresponding to a maximum field angle of the optical lens and a real image height IHm corresponding to a half of a value of the maximum field angle satisfy 0.42≤ IHm/IH <0.5.
  8. 8. The optical lens of claim 1, wherein the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy-15.65≤f1/f < -2.
  9. 9. The optical lens of claim 1, wherein the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy-8.98≤f2/f < -3.
  10. 10. The optical lens of claim 1, wherein the object-side light-transmitting half-aperture sagittal height Sag9 of the fifth lens and the object-side light-transmitting half-aperture d9 of the fifth lens satisfy 0< Sag9/d9<0.3.

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. 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 The invention aims to provide an optical lens with the advantage of good edge view field imaging effect. In order to achieve the above purpose, the invention adopts the following technical scheme: 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 having negative optical power; A third lens having positive optical power; a fourth lens having negative optical power; A fifth lens having positive optical power, an image side surface of which is convex; a sixth lens having positive optical power; a seventh lens having negative optical power; Wherein the sixth lens has a meniscus shape, and the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy that R11-R12 is less than or equal to-0.99 and R11+ R12 is less than or equal to-0.97. Further preferably, the effective focal length f of the optical lens, the real image height IH corresponding to the maximum field angle and the radian theta of the maximum half field angle meet (IH/2)/(f multiplied by theta) not less than 1.2. Further preferably, the maximum field angle FOV of the optical lens satisfies that FOV >150 °. Further preferably, a diaphragm is disposed between the third lens and the fourth lens, and the light-transmitting half-aperture of the surface behind the diaphragm is the minimum value of the light-transmitting half-apertures of all the lenses. Further preferably, the maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy 70 ° < FOV/Fno <110 °. Further preferably, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens meet IH/f >3. Further preferably, the real image height IH corresponding to the maximum field angle and the real image height IHm corresponding to the center field angle of the optical lens satisfy IHm/IH <0.5. Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy f1/f < -2. Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy f2/f < -3. Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy f4/f < -13 >. 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 requirements of I Sag3/d 3I <0.15. The optical lens provided by the invention has a large field angle and high resolution through reasonable configuration of the surface types of the lenses and reasonable collocation of the optical power, and has good imaging quality and clear edge field imaging. 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 an F-theta distortion curve of the optical lens in embodiment 1 of the present invention. Fig. 4 is a graph showing the relative illuminance of the optical lens in embodiment 1 of the present invention. Fig. 5 is an MTF graph of the optical lens in example 1 of the present invention. Fig. 6 is a schematic structural diagram of an optical lens in embodiment 2 of the present invention. Fig. 7 is a graph showing a field curvature of an optical lens in embodiment 2 of the present invention. Fig. 8 is an F-theta distortion curve of the optical lens in embodiment 2 of