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CN-116819731-B - Optical imaging lens

CN116819731BCN 116819731 BCN116819731 BCN 116819731BCN-116819731-B

Abstract

The application discloses an optical imaging lens which comprises an imaging lens group, a plurality of spacers, a lens barrel and a lens barrel, wherein the imaging lens group consists of a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis, three lenses with positive focal power are included in the lenses with refractive indexes smaller than 1.65 in the imaging lens group, the absolute value of the effective focal length of the fifth lens in the imaging lens group is minimum, the plurality of spacers comprise a second spacer which is supported on the image side surface of the second lens and a third spacer which is supported on the image side surface of the third lens, the lens barrel is used for accommodating the imaging lens group and the plurality of spacers, the effective focal length f3 of the third lens, the effective focal length f2 of the second lens, the interval EP23 between the second spacer and the third spacer along the optical axis satisfies that 6.5< |f2|/EP 23.5, and the radius of curvature R0 m of the image side end of the imaging lens group satisfies that R0 m and R0/R0 < 0.10|m.

Inventors

  • WANG CHAO
  • GUO YANLING
  • DING XIANCUI
  • DAI FUJIAN
  • ZHAO LIEFENG

Assignees

  • 浙江舜宇光学有限公司

Dates

Publication Date
20260505
Application Date
20221104

Claims (14)

  1. 1. An optical imaging lens, comprising: an imaging lens group, which consists of a first lens with positive focal power, a second lens with focal power, a third lens with positive focal power, a fourth lens with positive focal power and a fifth lens with negative focal power, wherein the first lens with positive focal power, the second lens with focal power, the third lens with positive focal power, the fourth lens with positive focal power and the fifth lens with negative focal power are sequentially arranged from an object side to an image side along an optical axis, and the lenses with refractive indexes less than 1.65 in the imaging lens group comprise three lenses with positive focal powers, and the absolute value of the effective focal length of the fifth lens in the imaging lens group is the smallest; A plurality of spacers including a second spacer disposed between the second lens and the third lens and bearing against an image side of the second lens and a third spacer disposed between the third lens and the fourth lens and bearing against an image side of the third lens, and A lens barrel for accommodating the imaging lens group and the plurality of spacers; The number of lenses with focal power in the optical imaging lens is five; the object side surface of the first lens is a convex surface; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the image side surface of the third lens is a convex surface; the effective focal length f3 of the third lens, the effective focal length f2 of the second lens, the interval EP23 between the second spacer and the third spacer along the optical axis direction satisfy that 7.33 is more than or equal to |f3- |f2|/EP 23 is more than or equal to 29.76, and The outer diameter D0m of the image side end of the lens barrel and the curvature radius R10 of the image side surface of the fifth lens meet the condition that D0m/R10 is less than or equal to 1.76 and less than or equal to 4.97.
  2. 2. The optical imaging lens of claim 1, wherein the plurality of spacers further comprises a first spacer disposed between the first lens and the second lens and bearing against an image side of the first lens and a fourth spacer disposed between the fourth lens and the fifth lens and bearing against an image side of the fourth lens.
  3. 3. The optical imaging lens of claim 2, further comprising at least one of a third auxiliary spacer disposed between an image side of the third spacer and an object side of the fourth lens and a fourth auxiliary spacer disposed between an image side of the fourth spacer and an object side of the fifth lens.
  4. 4. The optical imaging lens according to claim 1, wherein a radius of curvature R4 of an image side surface of the second lens, a radius of curvature R6 of an image side surface of the third lens, a maximum thickness CP2 of the second spacer in the optical axis direction, and a maximum thickness CP3 of the third spacer in the optical axis direction satisfy: -107.43mm < (R4X R6)/CP 2/10 < 24.23mm, and -68.04mm≤(R4×R6)/CP3/10≤-1.98mm。
  5. 5. The optical imaging lens according to claim 1, wherein an air gap T23 of the second lens and the third lens on the optical axis, a maximum thickness CP2 of the second spacer in the optical axis direction, a maximum thickness CP3 of the third spacer in the optical axis direction, and an air gap T34 of the third lens and the fourth lens on the optical axis satisfy that 8.15≤t23/CP 2+cp 3/T34≤21.30.
  6. 6. The optical imaging lens according to claim 1, wherein a maximum height L of the lens barrel in the optical axis direction, an effective focal length f of the optical imaging lens, and a maximum half field angle Semi-FOV of the optical imaging lens satisfy 1.12+.l/(f×tan (Semi-FOV))+≤1.30.
  7. 7. The optical imaging lens according to claim 2, wherein a distance TD between an object side surface of the first lens and an image side surface of the fifth lens on the optical axis, a spacing EP23 between the second spacer and the third spacer in the optical axis direction, and a spacing EP12 between the first spacer and the second spacer in the optical axis direction satisfy 3.55+.td/(EP 23+ep 12) +.5.67.
  8. 8. The optical imaging lens according to claim 2, wherein a radius of curvature R3 of an object side surface of the second lens, a radius of curvature R4 of an image side surface of the second lens, a maximum thickness CP1 of the first spacer in the optical axis direction, and a maximum thickness CP2 of the second spacer in the optical axis direction satisfy 6.63+.r3+r4)/(CP 1+cp 2)/10+.20.83.
  9. 9. The optical imaging lens as claimed in claim 1, wherein an effective focal length f of the optical imaging lens, an inner diameter d0m of an image side end of the lens barrel, and an inner diameter d0s of an object side end of the lens barrel satisfy 4.28mm 2 ≤f×(d0m-d0s)≤10.84mm 2 .
  10. 10. The optical imaging lens of claim 1, wherein an outer diameter D3m of the image side surface of the third spacer, an outer diameter D2m of the image side surface of the second spacer, a maximum effective radius DT32 of the image side surface of the third lens, and a maximum effective radius DT22 of the image side surface of the second lens satisfy: 0.14≤(D3m-D2m)/(DT32-DT22)≤5.13。
  11. 11. the optical imaging lens according to claim 1, wherein a radius of curvature R4 of an image side surface of the second lens, a radius of curvature R6 of an image side surface of the third lens, an inner diameter d3s of an object side surface of the third spacer, and an inner diameter d2m of an image side surface of the second spacer satisfy 4.46≤R 4-R6)/(d 3s-d2 m≤25.10.
  12. 12. The optical imaging lens as claimed in claim 1, wherein a radius of curvature R4 of the image side of the second lens, a radius of curvature R6 of the image side of the third lens, an inner diameter d3s of the object side of the third spacer and an inner diameter d2s of the object side of the second spacer satisfy-7.86≤R6/R4+d3s/d2s≤0.51.
  13. 13. The optical imaging lens according to claim 11, wherein a spacing EP23 between the second spacer and the third spacer in the optical axis direction, a refractive index N2 of the second lens and a refractive index N3 of the third lens satisfy 2.94 mm≤ep 23/(N2-N3). Ltoreq.10.81 mm.
  14. 14. The optical imaging lens according to claim 2, wherein a maximum height L of the lens barrel in the optical axis direction, a distance EP01 from an object side end of the lens barrel to an object side surface of the first spacer on the optical axis, and a sum Σat of air gaps on the optical axis between any adjacent two lenses of the first lens to the fifth lens satisfy that L/EP01×Σatis 5.16mm or less and 10.46mm or less.

Description

Optical imaging lens Statement of divisional application The application is a divisional application of China patent application with the application number 202211375124.9, which is filed by 11 months and 04 days in 2022 and is named as an optical imaging lens. Technical Field The application relates to the field of optical elements, in particular to an optical imaging lens. Background In recent years, the mobile phone industry has been moving toward portability, high pixel count and multifunction, and the limitations of mobile phones on imaging lenses mounted thereon are becoming more and more severe, especially in terms of flare, weight, optical parameters, reliability, etc., and in the case of mobile phone lenses mounted with conventional optical elements, problems of flare, optical parameters out of range and poor product reliability are likely to occur without limiting the reasonable range of these parameters, thereby affecting the product yield, and therefore, how to improve the above problems has become one of the key subjects of the development of the lens industry. For five-lens, especially small-head and ultra-thin lenses, stray light is easily generated by lenses with high refractive index, and a certain limit process is provided for lens molding, and in addition, the problem of assembly stability caused by large step difference occurs. Therefore, in order to realize the customer demand, design a five-piece type optical imaging lens under the premise of guaranteeing good optical imaging quality, rationally optimize the focal power, the surface shape and the size of the spacer of the lens, solve the problem of poor stability of lens assembly and stray light and have practical significance. Disclosure of Invention The application provides an optical imaging lens which comprises an imaging lens group, a plurality of spacers and a lens barrel, wherein the imaging lens group consists of a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis, the lenses with refractive indexes smaller than 1.65 in the imaging lens group comprise three lenses with positive focal power, the absolute value of the effective focal length of the fifth lens in the imaging lens group is minimum, the plurality of spacers comprise a second spacer which is arranged between the second lens and the third lens and is supported by an image side of the second lens, and a third spacer which is arranged between the third lens and the fourth lens and is supported by an image side of the third lens, and the lens barrel is used for accommodating the imaging lens group and the plurality of spacers, the maximum height L of the lens barrel along the optical axis direction, the effective focal length f of the optical imaging lens and the maximum half field angle of the optical imaging lens satisfy 0.8< L/(f×tan (Semi-FOV)) <1.7, and the inner diameter of the second lens with the inner diameter of the third lens R4, and the inner diameter of the third lens and the inner diameter of the third spacer which is satisfied by R4 and the inner diameter of the third lens and the inner diameter of the third spacer which is 2.3 m < 3.6 and the inner diameter of the third spacer is satisfied. On the other hand, the application also provides an optical imaging lens, which comprises an imaging lens group, a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged from an object side to an image side along an optical axis, the lenses with refractive indexes smaller than 1.65 in the imaging lens group comprise three lenses with positive focal power, and the absolute value of the effective focal length of the fifth lens in the imaging lens group is minimum; the lens assembly comprises a plurality of spacers, a lens barrel, a lens assembly and a lens assembly, wherein the spacers comprise a second spacer which is arranged between a second lens and a third lens and is supported by an image side surface of the second lens, and a third spacer which is arranged between the third lens and a fourth lens and is supported by an image side surface of the third lens, the lens assembly comprises three lenses with positive optical power, the absolute value of the effective focal length of the fifth lens in the imaging lens assembly is minimum, the spacers comprise a second spacer which is supported by the image side surface of the second lens and a third spacer which is supported by the image side surface of the third lens, the lens barrel is used for accommodating the imaging lens assembly and the spacers, the effective focal length f3 of the third lens, the effective focal length f2 of the second lens and the third spacer along the optical axis direction are separated by EP23, the effective focal length f2 of the second spacer and