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CN-121634480-B - Optical lens

CN121634480BCN 121634480 BCN121634480 BCN 121634480BCN-121634480-B

Abstract

The invention provides an optical lens, which comprises seven lenses with focal power, a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a concave object side and a seventh lens with negative focal power, wherein the object side curvature radius R3 of the second lens and the image side curvature radius R4 of the second lens meet the condition that (R3-R4)/(R3+R 4) < -0.1. The optical lens provided by the invention can improve the imaging quality of the optical lens, reduce the aberration and improve the imaging quality of the optical lens.

Inventors

  • BAO YUMIN

Assignees

  • 江西联创电子有限公司

Dates

Publication Date
20260512
Application Date
20260202

Claims (10)

  1. 1. An optical lens having seven lenses in number of optical power, characterized by comprising, 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 and a convex image-side surface; a third lens having negative optical power, the image-side surface of which is concave; a fourth lens with positive focal power, the object side surface of which is a convex surface; a fifth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; A sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; a seventh lens having negative optical power; The object side curvature radius R3 of the second lens and the image side curvature radius R4 of the second lens meet the condition that (R3-R4)/(R3+R 4) < -0.1, the total optical length TTL of the optical lens and the effective focal length f of the optical lens meet the condition that 4.5< TTL/f <5.5, 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 FOV of the maximum field angle of the optical lens meet the condition that 0.9< (IH/2)/(f multiplied by tan (FOV/2)) <0.96, and the focal length f6 of the sixth lens and the effective focal length f of the optical lens meet the condition that 2.1 </f 6/f < -0.8.
  2. 2. The optical lens according to claim 1, wherein the optical lens satisfies one or more of the following conditional expressions that an optical total length TTL of the optical lens and an effective focal length f of the optical lens satisfy 4.88< TTL/f <5.04, and a real image height IH corresponding to a maximum field angle of the optical lens satisfies 3.6< TTL/IH <4.2.
  3. 3. The optical lens according to claim 1, wherein the optical lens satisfies one or more of the following conditional expressions that a real image height IH corresponding to a maximum field angle of the optical lens and an entrance pupil diameter EPD of the optical lens satisfy 1.9< IH/EPD <2.3, and that a real image height IH corresponding to a maximum field angle of the optical lens and an effective focal length f of the optical lens satisfy 1.2< IH/f <1.4.
  4. 4. The optical lens according to claim 1, wherein the optical lens satisfies one or more of an optical total length TTL of the optical lens, a real image height IH corresponding to a maximum field angle of the optical lens and a maximum field angle FOV of the optical lens of 0.21<1 DEG x TTL/(IH/2)/(FOV/2) <0.24, and an effective focal length f of the optical lens, a real image height IH corresponding to a maximum field angle of the optical lens and a maximum field angle FOV of the optical lens of 50 DEG < f x FOV/IH <60 °.
  5. 5. The optical lens system according to claim 1, wherein the object-side light passing half aperture d1 of the first 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 satisfy 2.11< d 1/(IH/2)/tan (FOV/2) <3.05.
  6. 6. The optical lens according to claim 1, wherein the optical lens satisfies one or more of the following conditional expressions that a focal length f1 of the first lens and an effective focal length f of the optical lens satisfy-3.8 < f1/f < -2, a focal length f4 of the fourth lens and an effective focal length f of the optical lens satisfy-1.4 < f4/f <1.7, a focal length f5 of the fifth lens and an effective focal length f of the optical lens satisfy-0.7 < f5/f <1.3, and a focal length f7 of the seventh lens and an effective focal length f of the optical lens satisfy-14.5 < f7/f < -7.
  7. 7. The optical lens of claim 1, wherein the optical lens satisfies one or more of the following conditional expressions that a focal length f2 of the second lens and an effective focal length f of the optical lens satisfy-15 < f2/f < -5, an object-side surface radius of curvature R3 of the second lens and an image-side surface radius of curvature R4 of the second lens satisfy-0.33 < - (R3-R4)/(R3+R4) < -0.17, an object-side surface radius of curvature R3 of the second lens and an effective focal length f of the optical lens satisfy-1.5 < R3/f < -1.2, and an image-side surface radius of curvature R4 of the second lens and an effective focal length f of the optical lens satisfy-2.9 < R4/f < -1.7.
  8. 8. The optical lens as claimed in claim 1, wherein the optical lens satisfies one or more of a focal length f3 of the third lens and an effective focal length f of the optical lens of-13 < f3/f < -4, an image side curvature radius R6 of the third lens and an effective focal length f of the optical lens of 0.9< R6/f <7, and an image side curvature radius R6 of the third lens and an object side curvature radius R7 of the fourth lens of 0.9< R6/R7<8.
  9. 9. The optical lens as claimed in claim 1, wherein the optical lens satisfies one or more of the following conditional expressions that a focal length f6 of the sixth lens and an effective focal length f of the optical lens satisfy-2.02 < f6/f < -0.83, an object-side radius of curvature R11 of the sixth lens and an effective focal length f of the optical lens satisfy-2.5 < R11/f < -0.7, an image-side radius of curvature R12 of the sixth lens and an effective focal length f of the optical lens satisfy-2.8 < R12/f <6.5, and an object-side radius of curvature R11 of the sixth lens and an image-side radius of curvature R12 of the sixth lens satisfy-0.7 < (R11+R12)/(R11-R12) < -0.1.
  10. 10. The optical lens according to claim 1, wherein the optical lens satisfies one or more of the following conditional expressions that a focal length f1 of the first lens and a combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens satisfy-1.1 < f1/f1234< -0.7, a combined focal length f567 of the seventh lens and the fifth lens, the sixth lens and the seventh lens satisfy-6.5 < f7/f567< -2.4, and a focal length f1 of the first lens and a focal length f7 of the seventh lens satisfy-0.2 < f1/f7<0.35.

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. In order to achieve the above purpose, the invention adopts the following technical scheme: an optical lens having seven lenses in number of optical power, comprising, 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 and a convex image-side surface; a third lens having negative optical power, the image-side surface of which is concave; a fourth lens with positive focal power, the object side surface of which is a convex surface; a fifth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; A sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; a seventh lens having negative optical power; Wherein the object-side curvature radius R3 of the second lens and the image-side curvature radius R4 of the second lens satisfy-0.4 < (R3-R4)/(R3 + R4) < -0.1. Further preferably, the optical lens satisfies one or more of the following conditional expressions that the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy 4.5< TTL/f <5.5, and the real image height IH corresponding to the maximum field angle of the optical lens and the optical total length TTL of the optical lens satisfy 3.6< TTL/IH <4.2. Further preferably, the optical lens satisfies one or more of the following conditional expressions that a real image height IH corresponding to a maximum field angle of the optical lens and an entrance pupil diameter EPD of the optical lens satisfy 1.9< IH/EPD <2.3, and a real image height IH corresponding to a maximum field angle of the optical lens and an effective focal length f of the optical lens satisfy 1.2< IH/f <1.4. Further preferably, the optical lens satisfies one or more of the following conditional expressions that an optical total length TTL of the optical lens, a real image height IH corresponding to a maximum field angle of the optical lens and a maximum field angle FOV of the optical lens satisfy 0.21<1 DEG x TTL/(IH/2)/(FOV/2) <0.24, and an effective focal length f of the optical lens, a real image height IH corresponding to a maximum field angle of the optical lens and a maximum field angle FOV of the optical lens satisfy 50 DEG < f x FOV/IH <60 deg. Further preferably, the optical lens satisfies one or more of the following conditional expressions that the object side light passing half aperture d1 of the first 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 satisfy 2.11< d 1/(IH/2)/tan (FOV/2) <3.05, and 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 FOV of the maximum field angle of the optical lens satisfy 0.9< (IH/2)/(f×tan (FOV/2)) <0.96. Further preferably, the optical lens satisfies one or more of the following conditional expressions that a focal length f1 of the first lens and an effective focal length f of the optical lens satisfy-3.8 < f1/f < -2, a focal length f4 of the fourth lens and an effective focal length f of the optical lens satisfy-1.4 < f4/f <1.7, a focal length f5 of the fifth lens and an effective focal length f of the optical lens satisfy-0.7 < f5/f <1.3, and a focal length f7 of the seventh lens and an effective focal length f of the optical lens satisfy-14.5 < f7/f < -7. Further preferably, the optical lens satisfies one or more of the following conditional expressions that a focal length f2 of the second lens and an effective focal length f of the optical lens satisfy-15 < f2/f < -5,