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CN-118981094-B - Optical imaging lens

CN118981094BCN 118981094 BCN118981094 BCN 118981094BCN-118981094-B

Abstract

The application discloses an optical imaging lens, which comprises a lens barrel, an imaging lens group and a spacing element group, wherein the imaging lens group and the spacing element group are arranged in the lens barrel, the imaging lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object side to an image side along an optical axis, the first lens, the fourth lens, the seventh lens have positive focal power, the third lens, the fifth lens, the sixth lens and the eighth lens have negative focal power, the spacing element group comprises a sixth spacing element and a seventh spacing element, the sixth spacing element is arranged on an image side of the sixth lens and is contacted with the image side of the sixth lens, the seventh spacing element is arranged on the image side of the seventh lens and is contacted with the image side of the seventh lens, the number of the lenses with the optical focal power is eight, the spacing distance T67 between the sixth lens and the seventh lens on the optical axis and the distance EP67 between the sixth spacing element and the seventh spacing element along the optical axis satisfies 10.3< EP67/T67.8, the radius of curvature R12 of the image side of the sixth lens and the distance EP 67/T6.8, and the radius of curvature R12 of the image side of the sixth lens and the distance R12 of the distance R6.6/D < 6.6.6/D < 1.95.6/6.

Inventors

  • HUANG CHONGJIAN
  • LI YANG
  • YAO ZEJIE
  • XING TIANXIANG
  • DING REN
  • FANG RONGBO
  • WENREN JIANKE
  • DAI FUJIAN

Assignees

  • 浙江舜宇光学有限公司

Dates

Publication Date
20260512
Application Date
20240923

Claims (17)

  1. 1. Optical imaging lens, its characterized in that includes: An imaging lens group including a first lens having positive optical power, a second lens having positive optical power or negative optical power, a third lens having negative optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, a sixth lens having negative optical power, a seventh lens having positive optical power, and an eighth lens having negative optical power, which are sequentially arranged from an object side to an image side along an optical axis; A spacer element group including a sixth spacer element disposed on and in contact with an image side of the sixth lens and a seventh spacer element disposed on and in contact with an image side of the seventh lens, and A lens barrel in which the imaging lens group and the spacing element group are disposed; wherein the number of lenses of the optical imaging lens having optical power is eight; A separation distance T67 of the sixth lens and the seventh lens on the optical axis and a distance EP67 of the sixth spacer element and the seventh spacer element along the optical axis satisfy 10.3< EP67/T67<34.8; The radius of curvature R12 of the image side of the sixth lens and the outer diameter D6s of the object side of the sixth spacing element satisfy 0.8< R12/D6 s≤1.90.
  2. 2. The optical imaging lens according to claim 1, wherein a radius of curvature R15 of an object side surface of the eighth lens and an outer diameter D7m of an image side surface of the seventh spacer element satisfy 0.40≤R15/D7 m≤0.70.
  3. 3. The optical imaging lens according to claim 1, wherein an on-axis distance SAG72 between an intersection of the image side surface of the seventh lens and the optical axis to an effective radius vertex of the image side surface of the seventh lens, an on-axis distance SAG82 between an intersection of the image side surface of the eighth lens and the optical axis to an effective radius vertex of the image side surface of the eighth lens, and a maximum thickness CP7 of the seventh spacer element satisfy 0.75 +|sag82|+|sag72|) per CP7 +.1.20.
  4. 4. The optical imaging lens according to claim 1, wherein a radius of curvature R14 of an image side surface of the seventh lens and an outer diameter D7s of an object side surface of the seventh spacer element satisfy 1.75≤R14/D7 s≤3.05.
  5. 5. The optical imaging lens according to claim 1, wherein an outer diameter D0s of an object side end surface of the lens barrel, an outer diameter D0m of an image side end surface of the lens barrel, and a half of a diagonal length ImgH of an effective pixel region on an imaging surface of the optical imaging lens satisfy 0.7< (D0 m-D0 s)/ImgH <1.25.
  6. 6. The optical imaging lens according to claim 1, wherein a sum Σat of a length L of the lens barrel in a direction where the optical axis is located and a distance separating any adjacent two lenses of the first lens to the eighth lens on the optical axis satisfies 2.75+.l/Σat <3.3.
  7. 7. The optical imaging lens of any of claims 1-6, wherein the spacer element group further comprises a first spacer element disposed on and in contact with an image side of the first lens; Wherein the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacing element satisfy 1.35< f1/d1s less than or equal to 1.60.
  8. 8. The optical imaging lens of any of claims 1-6, wherein the set of spacer elements further comprises a first spacer element disposed on and in contact with an image side of the first lens and a second spacer element disposed on and in contact with an image side of the second lens; Wherein a distance T12 of the first lens and the second lens on the optical axis, a distance T23 of the second lens and the third lens on the optical axis and a distance EP12 of the first spacer element and the second spacer element along the optical axis satisfy 3.05< EP 12/(T12+T23) <4.8.
  9. 9. The optical imaging lens of any of claims 1-6, wherein the set of spacer elements further comprises a second spacer element disposed on and in contact with an image side of the second lens; Wherein the curvature radius R4 of the image side surface of the second lens, the refractive index N2 of the second lens and the outer diameter D2s of the object side surface of the second spacing element satisfy R4 multiplied by N2/D2s which is 1.55-2.5.
  10. 10. The optical imaging lens of any of claims 1-6, wherein the set of spacer elements further comprises a second spacer element disposed on and in contact with an image side of the second lens and a third spacer element disposed on and in contact with an image side of the third lens; Wherein the distance EP23 between the second spacing element and the third spacing element along the optical axis, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis meet 1.0< EP 23/(CT 2+CT 3) less than or equal to 1.15.
  11. 11. The optical imaging lens of any of claims 1-6, wherein the spacer element group further comprises a third spacer element disposed on and in contact with an image side of the third lens; Wherein the radius of curvature R6 of the image side surface of the third lens, the refractive index N3 of the third lens and the outer diameter D3s of the object side surface of the third spacing element satisfy 0.75< R6XN 3/D3s <1.05.
  12. 12. The optical imaging lens of any of claims 1-6, wherein the set of spacer elements further comprises a third spacer element disposed on and in contact with an image side of the third lens and a fourth spacer element disposed on and in contact with an image side of the fourth lens; Wherein a distance T34 of the third lens and the fourth lens on the optical axis, a distance EP34 of the third spacer element and the fourth spacer element along the optical axis, and a maximum thickness CP4 of the fourth spacer element satisfy 1.1< T34/(EP 34+CP4) <1.5.
  13. 13. The optical imaging lens of any of claims 1-6, wherein the set of spacer elements further comprises a fourth spacer element disposed on and in contact with an image side of the fourth lens; Wherein the radius of curvature R9 of the object side of the fifth lens, the inner diameter D4m of the image side of the fourth spacing element and the outer diameter D4m of the image side of the fourth spacing element satisfy-14.05 < R9/(D4 m-D4 m) < -4.6.
  14. 14. The optical imaging lens of any of claims 1-6, wherein the set of spacer elements further comprises a fourth spacer element disposed on and in contact with an image side of the fourth lens and a fifth spacer element disposed on and in contact with an image side of the fifth lens; wherein a distance EP45 of the fourth and fifth spacing elements along the optical axis and a center thickness CT5 of the fifth lens on the optical axis satisfy 1.5< EP45/CT5<2.15.
  15. 15. The optical imaging lens of any of claims 1-6, wherein the spacer element group further comprises a fifth spacer element disposed on and in contact with an image side surface of the fifth lens; Wherein the curvature radius R10 of the image side surface of the fifth lens and the outer diameter D5s of the object side surface of the fifth interval element satisfy R10/D5s < -5.1 > of-11.35.
  16. 16. The optical imaging lens of any of claims 1-6, wherein the spacer element group further comprises a fifth spacer element disposed on and in contact with an image side surface of the fifth lens; wherein the radius of curvature R11 of the object side of the sixth lens and the outer diameter D5m of the image side of the fifth spacer element satisfy-1.35 < R11/D5m < -0.9.
  17. 17. The optical imaging lens as claimed in any one of claims 1 to 6, wherein, The object side surface of the first lens is a convex surface, and the image side surface is a concave surface; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a concave surface, and the image side surface is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface is a concave surface; The seventh lens element with a convex object-side surface and a concave image-side surface, and The object side surface of the eighth lens is a convex surface, and the image side surface is a concave surface.

Description

Optical imaging lens Technical Field The application relates to the field of optical devices, in particular to an optical imaging lens. Background In recent years, with the increasing consumer demand, the requirements of optical imaging lenses are becoming increasingly complex and diversified. Under different application scenes, the performances of the optical imaging lenses are different. Eight-piece optical imaging lenses have become mainstream, and are widely applied in the fields of mobile phones, virtual reality technology, augmented reality technology, machine vision technology and the like. The rear end lens has a larger influence on the overall imaging of the eight-lens optical imaging lens, for example, the sixth lens and the seventh lens are more sensitive, and when the arrangement of the sixth lens, the seventh lens and the adjacent interval elements is unreasonable, the assembly stability of the optical imaging lens is poor, so that the imaging quality of the optical imaging lens is affected. Disclosure of Invention An aspect of the present application provides an optical imaging lens including a barrel, and an imaging lens group and a spacer element group disposed in the barrel. The imaging lens group includes a first lens having positive optical power, a second lens having positive optical power or negative optical power, a third lens having negative optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, a sixth lens having negative optical power, a seventh lens having positive optical power, and an eighth lens having negative optical power, which are sequentially arranged from an object side to an image side along an optical axis. The spacer element group includes a sixth spacer element disposed on and in contact with the image side of the sixth lens element and a seventh spacer element disposed on and in contact with the image side of the seventh lens element. The number of lenses of the optical imaging lens having optical power is eight. The distance T67 of the sixth lens and the seventh lens on the optical axis and the distance EP67 of the sixth spacer element and the seventh spacer element along the optical axis satisfy 10.3< EP67/T67<34.8. The radius of curvature R12 of the image side of the sixth lens and the outer diameter D6s of the object side of the sixth spacing element satisfy 0.8< R12/D6s <1.95. According to an exemplary embodiment of the present application, the radius of curvature R15 of the object-side surface of the eighth lens element and the outer diameter D7m of the image-side surface of the seventh spacing element satisfy 0.4≤R15/D7 m≤0.7. According to an exemplary embodiment of the present application, an on-axis distance SAG72 between an intersection point of the image side surface of the seventh lens and the optical axis to an effective radius vertex of the image side surface of the seventh lens, an on-axis distance SAG82 between an intersection point of the image side surface of the eighth lens and the optical axis to an effective radius vertex of the image side surface of the eighth lens, and a maximum thickness CP7 of the seventh spacing element satisfy 0.7< (|SAG 82|+|SAG 72|)/CP 7. Ltoreq.1.2. According to an exemplary embodiment of the present application, the radius of curvature R14 of the image side of the seventh lens and the outer diameter D7s of the object side of the seventh spacer element satisfy 1.7< R14/D7s <3.1. According to an exemplary embodiment of the present application, an outer diameter D0s of an object side end surface of the lens barrel, an outer diameter D0m of an image side end surface of the lens barrel, and a half of a diagonal length of an effective pixel area on an imaging surface of the optical imaging lens satisfy 0.7< (D0 m-D0 s)/ImgH <1.25. According to an exemplary embodiment of the present application, the sum ΣAT of the length L of the lens barrel in the direction of the optical axis and the interval distance on the optical axis between any adjacent two lenses among the first lens to the eighth lens satisfies 2.7< L/ΣAT <3.3. According to an exemplary embodiment of the application, the spacer element group further comprises a first spacer element, which is placed on and in contact with the image side of the first lens. Wherein the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacing element satisfy 1.35< f1/d1s less than or equal to 1.6. According to an exemplary embodiment of the application, the spacer element group further comprises a first spacer element arranged at and in contact with the image side of the first lens and a second spacer element arranged at and in contact with the image side of the second lens. Wherein a separation distance T12 of the first lens and the second lens on the optical axis, a separation distance T23 of the second lens and the third lens on the optical axis and a distance EP12 of the fir