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CN-122018119-A - Optical imaging lens

CN122018119ACN 122018119 ACN122018119 ACN 122018119ACN-122018119-A

Abstract

The application provides an optical imaging lens and electronic equipment. The optical imaging lens sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, the optical imaging lens further comprises a plurality of interval elements, the plurality of interval elements comprise a first interval element, a second interval element and a third interval element, f1/R1 is more than or equal to 0.30 and less than or equal to 0.70, f34/f2 is more than or equal to 0.90 and less than or equal to 1.25, E01/(EP 12 plus sigma CP 1) <1.25, f1 is an effective focal length of the first lens, R1 is a curvature radius of an object side surface of the first lens, f34 is a combined focal length of the third lens and the fourth lens, f2 is an effective focal length of the second lens, EP01 is a distance from an object side end surface of a lens barrel to the object side surface of the first interval element along the optical axis direction, EP12 is a distance between the first interval element and the second interval element along the optical axis direction, and sigma CP1 is a sum of maximum thicknesses of all interval elements between the first lens and the second lens along the optical axis direction. The possibility of lens cracking in the optical imaging lens is reduced, and the production yield and the long-term stability of the lens are improved.

Inventors

  • XU SHUAIFENG
  • MEI FANG
  • WANG CHAO
  • LV SAIFENG

Assignees

  • 浙江舜宇光学有限公司

Dates

Publication Date
20260512
Application Date
20260304

Claims (12)

  1. 1. An optical imaging lens is characterized by comprising a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power and a fourth lens with negative focal power in sequence from an object side to an image side along an optical axis, The object side surface of the first lens is a concave surface, and the image side surface of the first lens is a concave surface; The object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; 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; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; Each adjacent lens of the first, second, third and fourth lenses has an on-axis air gap therebetween, the on-axis air gap between the third and fourth lenses being the smallest of the on-axis air gaps between each adjacent lens, The optical imaging lens further includes a plurality of spacer elements including a first spacer element, a second spacer element and a third spacer element, The first spacer element is disposed on the image side of the first lens and in contact with the image side of the first lens; the second spacer element is disposed on the image side of the second lens and in contact with the image side of the second lens; The third spacer element is disposed on the image side of the third lens and in contact with the image side of the third lens; the plurality of spacer elements, the first lens, the second lens, the third lens, and the fourth lens are disposed within a lens barrel, Wherein, the 0.30 < f1/R1<0.70,0.90< f34/f2 <1.25, 0.50< EP 01/(EP 12 +. Sigma. CP 1) <1.25, F1 is an effective focal length of the first lens, R1 is a radius of curvature of an object side surface of the first lens, f34 is a combined focal length of the third lens and the fourth lens, f2 is an effective focal length of the second lens, EP01 is a distance from an object side end surface of the lens barrel to the object side surface of the first spacing element along the optical axis direction, EP12 is a spacing distance between the first spacing element and the second spacing element along the optical axis direction, and Σcp1 is a sum of maximum thicknesses of all spacing elements between the first lens and the second lens along the optical axis direction.
  2. 2. The optical imaging lens according to claim 1, wherein a center thickness CT2 of the second lens, a center thickness CT1 of the first lens, a sum Σcp1 of maximum thicknesses of all spacer elements between the first lens and the second lens in the optical axis direction, a sum Σcp2 of maximum thicknesses of all spacer elements between the second lens and the third lens in the optical axis direction, and a spacing distance EP12 of the first spacer element and the second spacer element in the optical axis direction satisfy 1.65< CT2/CT 1+ 3.00,1.25 +Σcp 2)/EP 12<6.00.
  3. 3. The optical imaging lens as claimed in claim 1, wherein an inner diameter d0s of an object side end surface of the lens barrel, an inner diameter d3s of an object side surface of the third interval element, and an entrance pupil diameter EPD of the optical imaging lens satisfy 1.45+.d0s/d3s <2.30,2.50< d0s/EPD <4.00.
  4. 4. The optical imaging lens as claimed in claim 1, wherein the plurality of spacer elements further comprises a fourth spacer element disposed on an image side of the fourth lens and in contact with an image side of the fourth lens, The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air gap T34 between the third lens and the fourth lens on the optical axis, the spacing distance EP23 between the second spacing element and the third spacing element along the optical axis direction and the spacing distance EP34 between the third spacing element and the fourth spacing element along the optical axis direction meet that (f3+f4)/T34 < -5.50,10.45 is less than or equal to (EP 23+EP 34)/T34 is less than or equal to 15.20.
  5. 5. The optical imaging lens as claimed in claim 1, wherein the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfy-1.30 < f1/d1s < -0.50.
  6. 6. The optical imaging lens as set forth in claim 1, wherein an effective focal length f1 of the first lens, an effective focal length f of the optical imaging lens, a distance EP01 from an object side end surface of the lens barrel to an object side surface of the first spacer element in the optical axis direction, and a center thickness CT1 of the first lens satisfy-1.30 < f1/f < -0.95,3.90< EP01/CT1<7.40.
  7. 7. The optical imaging lens according to claim 1, wherein a sum Σcp1 of maximum thicknesses of all spacer elements between the first lens and the second lens in the optical axis direction, a sum Σcp2 of maximum thicknesses of all spacer elements between the second lens and the third lens in the optical axis direction, an air gap T12 between the first lens and the second lens in the optical axis, an air gap T23 between the second lens and the third lens in the optical axis, an air gap T34 between the third lens and the fourth lens in the optical axis, a maximum height L of a lens barrel, a sum Σcp2 of maximum thicknesses of all spacer elements between the second lens and the third lens in the optical axis direction satisfy 19.75+.t23)/t34 <34.45, 2.40+Σcp2) <4.45.
  8. 8. The optical imaging lens as claimed in claim 1, wherein an inner diameter d0m of an image side end surface of the lens barrel, an effective focal length f of the optical imaging lens and a half Semi-FOV of a maximum field angle of the optical imaging lens satisfy 3.40< d0 m/(f) tan(Semi-FOV))<4.75。
  9. 9. The optical imaging lens according to claim 1, wherein an air gap T23 between the second lens and the third lens on the optical axis and a maximum value CP2max of a maximum thickness of all spacer elements between the second lens and the third lens in the optical axis direction satisfy 0.80< T23/CP2max <1.20.
  10. 10. The optical imaging lens of claim 1, wherein an image side outer diameter D3m of the third spacer element and an object side inner diameter D3s of the third spacer element satisfy 2.05< D3m/D3s <4.25.
  11. 11. The optical imaging lens as claimed in claim 1, wherein an effective focal length f3 of the third lens, an effective focal length f of the optical imaging lens, and an effective focal length f4 of the fourth lens satisfy 0.60≤f3/f≤0.75, -1.55< f4/f3< -1.30.
  12. 12. The optical imaging lens of claim 1, wherein the f-number FNO of the optical imaging lens and half of the maximum field angle Semi-FOV of the optical imaging lens satisfy 2.35< FNO/tan (Semi-FOV) <2.80.

Description

Optical imaging lens Technical Field The present application relates to the field of optics, and more particularly, to an optical imaging lens. Background With the progress of science and technology and the development of society, the application of optical imaging lenses is becoming wider and wider, which puts higher demands on the optical imaging lenses. For example, the increasing safety awareness and the increasing popularity of security monitoring facilities make consumers increasingly demanding monitoring environments and pictures, and consumers want to capture clear pictures in various environments. In order to realize excellent optical performance such as high resolution and large field angle, the optical system design of the optical imaging lens is more complex, and generally, a plurality of lenses with different curvatures and different materials are assembled according to the requirements of precise optical spacing and coaxiality, namely, high-precision assembly and adjustment are required. The assembling process is a core link in the production and manufacture of the optical imaging lens, and the assembly precision determines the final imaging quality of the lens, so that the requirements on the refinement degree and the stability of the assembly process are extremely high. In the high-precision assembly process of the optical imaging lens, the lens is used as a core optical element, and the stress concentration problem becomes a technical pain point commonly faced in the industry due to the interaction of the material characteristics and the assembly environment. The cracking problem of the lens caused by stress concentration has a significant negative effect on the production and use of the optical imaging lens. Disclosure of Invention An aspect of the embodiment of the present application provides an optical imaging lens, including, in order from an object side to an image side along an optical axis, a first lens having negative optical power, a second lens having positive optical power, a third lens having positive optical power, and a fourth lens having negative optical power, wherein an object side surface of the first lens is a concave surface, and an image side surface of the first lens is a concave surface; the object side of the second lens is convex, the image side of the second lens is convex, the object side of the third lens is convex, the image side of the third lens is convex, the object side of the fourth lens is concave, the image side of the fourth lens is convex, each adjacent lens of the first lens, the second lens, the third lens and the fourth lens has an on-axis air gap, the on-axis air gap between the third lens and the fourth lens is the minimum value of the on-axis air gaps between the adjacent lenses, the optical imaging lens further comprises a plurality of spacing elements, the plurality of spacing elements comprise a first spacing element, a second spacing element and a third spacing element, the first spacing element is arranged on the image side of the first lens and is in contact with the image side of the first lens, the second spacing element is arranged on the image side of the second lens and is in contact with the image side of the second lens, the third spacing element is arranged on the image side of the third lens and is in contact with the image side of the fourth lens, the third spacing element is arranged on the image side of the lens and is equal to or less than or equal to 0.1.1.0.1.5 f < 0.1.1.5.1.1.1.5.1.1.0.0.0.0.0.1.1.1.0.0.0.0.0.0.0 lens, r1 is the radius of curvature of the object side surface of the first lens, f34 is the combined focal length of the third lens and the fourth lens, f2 is the effective focal length of the second lens, EP01 is the distance from the object side end surface of the lens barrel to the object side surface of the first spacing element along the optical axis direction, EP12 is the spacing distance between the first spacing element and the second spacing element along the optical axis direction, and ΣCP1 is the sum of the maximum thicknesses of all spacing elements between the first lens and the second lens along the optical axis direction. According to the embodiment of the application, the center thickness CT2 of the second lens, the center thickness CT1 of the first lens, the sum of the maximum thicknesses of all spacing elements between the first lens and the second lens along the optical axis direction Sigma CP1, the sum of the maximum thicknesses of all spacing elements between the second lens and the third lens along the optical axis direction Sigma CP2 and the spacing distance EP12 between the first spacing element and the second spacing element along the optical axis direction satisfy that 1.65< CT2/CT1 is less than or equal to 3.00,1.25 (Sigma CP1 plus Sigma CP 2)/EP 12<6.00. According to the embodiment of the application, the inner diameter d0s of the object side end surface of the lens barrel, the inner dia