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DE-202026101637-U1 - Optical imaging lens assembly, image acquisition unit and electronic device

DE202026101637U1DE 202026101637 U1DE202026101637 U1DE 202026101637U1DE-202026101637-U1

Abstract

Optical imaging lens assembly comprising four lens elements (E1, E2, E3, E4), wherein the four lens elements (E1, E2, E3, E4) are arranged in the order from an object side to an image side along a beam path as a first lens element (E1), a second lens element (E2), a third lens element (E3) and a fourth lens element (E4), and each of the four lens elements (E1, E2, E3, E4) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a positive refractive power, the object-side surface of the second lens element (E2) is convex in a paraxial region thereof, the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the third lens element (E3) has a positive refractive power, the fourth lens element (E4) has a negative refractive power, the object-side surface of the fourth lens element (E4) is concave in a paraxial region thereof, the image-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, and at least one of the object-side surface and image-side surface of at least one lens element of the optical imaging lens assembly has at least one inflection point (P); where TD is an axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the fourth lens element (E4), BL is an axial distance between the image-side surface of the fourth lens element (E4) and an image surface (IMG), |f1| is an absolute value of the focal length of the first lens element (E1), |f2| is an absolute value of the focal length of the second lens element (E2), |f3| is an absolute value of the focal length of the third lens element (E3), |f4| is an absolute value of the focal length of the fourth lens element (E4), |f1| is a maximum value of |f1|, |f2|, |f3| and |f4| |f1|max, CT3 is a central thickness of the third lens element (E3), T34 is an axial distance between the third lens element (E3) and the fourth lens element (E4), and the following conditions are satisfied: 0,10 < TD / BL < 0,70 ; 0,20 < | f2 | / | fi | max ≤ 1 ,00; und 0,10 < CT3 / T34 < 1,20.

Assignees

  • LARGAN PRECISION CO LTD

Dates

Publication Date
20260513
Application Date
20260324
Priority Date
20250409

Claims (20)

  1. Optical imaging lens assembly comprising four lens elements (E1, E2, E3, E4), wherein the four lens elements (E1, E2, E3, E4) are arranged in the order from an object side to an image side along a beam path as a first lens element (E1), a second lens element (E2), a third lens element (E3) and a fourth lens element (E4), and each of the four lens elements (E1, E2, E3, E4) has an object-side surface facing the object side and an image-side surface facing facing the image side; wherein the first lens element (E1) has a positive refractive power, the object-side surface of the second lens element (E2) is convex in a paraxial region thereof, the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the third lens element (E3) has a positive refractive power, the fourth lens element (E4) has a negative refractive power, the object-side surface of the fourth lens element (E4) is concave in a paraxial region thereof, the image-side surface of the fourth lens element (E4) is convex in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of at least one lens element of the optical imaging lens assembly has at least one inflection point (P); where TD is an axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the fourth lens element (E4), BL is an axial distance between the image-side surface of the fourth lens element (E4) and an image surface (IMG), |f1| is an absolute value of the focal length of the first lens element (E1), |f2| is an absolute value of the focal length of the second lens element (E2), |f3| is an absolute value of the focal length of the third lens element (E3), |f4| is an absolute value of the focal length of the fourth lens element (E4), |f1| is a maximum value of |f1|, |f2|, |f3| and |f4| |f1|max, CT3 is a central thickness of the third lens element (E3), T34 is an axial distance between the third lens element (E3) and the fourth lens element (E4), and the following conditions are satisfied: 0,10 < TD / BL < 0,70 ; 0,20 < | f2 | / | fi | max ≤ 1 ,00; und 0,10 < CT3 / T34 < 1,20.
  2. Optical imaging lens assembly according to Claim 1 , where TL is an axial distance between the object-side surface of the first lens element (E1) and the image surface (IMG), is a maximum image height of the optical imaging lens assembly ImgH, and the following condition is met: 3,00 < TL / ImgH < 6,00.
  3. Optical imaging lens assembly according to Claim 1 , where BL is the axial distance between the image-side surface of the fourth lens element (E4) and the image surface (IMG), f is a focal length of the optical imaging lens assembly and the following condition is satisfied: 0,70 < BL / f < 1,30.
  4. Optical imaging lens assembly according to Claim 1 , where f is the focal length of the optical lens assembly, f is the focal length of the second lens element (E2), and the following condition is satisfied: − 3,00 < f / f2 < 0,80.
  5. Optical imaging lens assembly according to Claim 1 , where the focal length of the second lens element (E2) is f2, the focal length of the fourth lens element (E4) is f4 and the following condition is met: 0,00 < | f4 / f2 | < 5,00.
  6. Optical imaging lens assembly according to Claim 1 , where a radius of curvature of the image-side surface of the first lens element (E1) is R2, a radius of curvature of the object-side surface of the second lens element (E2) is R3 and the following condition is satisfied: 0,00 < | R3 / R2 | < 1,00.
  7. Optical imaging lens assembly according to Claim 1 , where a radius of curvature of the object-side surface of the first lens element (E1) is R1, a radius of curvature of the image-side surface of the third lens element (E3) is R6, a radius of curvature of the image-side surface of the fourth lens element (E4) is R8 and the following conditions are met: 0,00 < | R8 / R1 | < 1,50 ; und 0,00 < | R8 / R6 | < 1,20.
  8. Optical imaging lens assembly according to Claim 1 , where the axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the fourth lens element (E4) is TD, the axial distance between the image-side surface of the fourth lens element (E4) and the image surface (IMG) is BL, an axial distance between the object-side surface of the first lens element (E1) and the image surface (IMG) is TL, a radius of curvature of the object-side surface of the third lens element (E3) is R5, and the following conditions are met: 0,10 < TD / BL < 0,55 ; und − 2,00 < TL / R5 < 6,00.
  9. Optical imaging lens assembly according to Claim 1 , where V1 is an Abbe number of the first lens element (E1), N1 is a refractive index of the first lens element (E1), and the following condition is satisfied: 18,00 < V1 / N1 < 43,00.
  10. Optical imaging lens assembly according to Claim 1 , where a maximum effective radius of the object-side surface of the first lens element (E1) is Y1R1, a maximum effective radius of the image-side surface of the fourth lens element (E4) is Y4R2 and the following condition is satisfied: 1,00 < Y1R1 / Y4R2 < 1,70.
  11. Optical imaging lens assembly according to Claim 1 , wherein the optical imaging lens assembly has a first state corresponding to an infinite object distance and a second state corresponding to a finite object distance, and the finite object distance is equal to or less than 1000 millimeters; when an imaged object moves from infinity towards the finite object distance, at least one lens element of the optical imaging lens assembly moves along an optical axis direction with respect to other lens elements of the optical imaging lens assembly to perform a motion focusing process, such that the optical imaging lens assembly transitions from the first state to the second state.
  12. Optical imaging lens assembly according to Claim 1 , which further comprises at least one reflective element (E5, LF), wherein the at least one reflective element (E5, LF) is arranged between the fourth lens element (E4) and the image surface (IMG).
  13. Image acquisition unit (100), comprising: the optical imaging lens assembly according to Claim 1 ; and an image sensor (103) arranged on the image surface (IMG) of the optical imaging lens assembly.
  14. Electronic device (200), comprising: the image acquisition unit (100) according to Claim 13 .
  15. Optical imaging lens assembly comprising four lens elements (E1, E2, E3, E4), wherein the four lens elements (E1, E2, E3, E4) are arranged in the order from an object side to an image side along a beam path as a first lens element (E1), a second lens element (E2), a third lens element (E3) and a fourth lens element (E4), and each of the four lens elements (E1, E2, E3, E4) has an object-side surface facing the object side and an image-side surface facing the image side; wherein the first lens element (E1) has a positive refractive power, the object-side surface of the second lens element (E2) is convex in a paraxial region thereof, the image-side surface of the second lens element (E2) is concave in a paraxial region thereof, the third lens element (E3) has a positive refractive power, the fourth lens element (E4) has a negative refractive power, the object-side surface of the fourth lens element (E4) is concave in a paraxial region thereof, and the image-side surface of the fourth lens element (E4) is convex in a paraxial region thereof; wherein an axial distance between the object-side surface of the first lens element (E1) and the image-side surface of the fourth lens element (E4) is TD, an axial distance between the image-side surface of the fourth lens element (E4) and an image surface (IMG) BL is, an Abbe number of the fourth lens element (E4) is V4, a central thickness of the first lens element (E1) is CT1, an axial distance between the second lens element (E2) and the third lens element (E3) is T23, a radius of curvature of the object-side surface of the second lens element (E2) is R3, a radius of curvature of the image-side surface of the third lens element (E3) is R6, and the following conditions are met: 0,10 < TD / BL < 0,60 ; 5,0 < V4 < 40,0 ; 1,00 < CT1 / T23 < 4,00 ; und 0,00 < | R3 / R6 | < 0,80.
  16. Optical imaging lens arrangement according to Claim 15 , wherein the image-side surface of the third lens element (E3) has at least one inflection point (P); wherein TL is an axial distance between the object-side surface of the first lens element (E1) and the image surface (IMG), f is a focal length of the optical imaging lens assembly, and the following condition is satisfied: 1,15 < TL / f < 1,55.
  17. Optical imaging lens assembly according to Claim 15 , where the maximum field of view of the optical imaging lens assembly is FOV and the following condition is met: 25 Grad < FOV < 40 Grad .
  18. Optical imaging lens assembly according to Claim 15 , where ΣCT is a sum of the central thicknesses of all lens elements of the optical imaging lens assembly, ΣAT is a sum of the axial distances between each of all adjacent lens elements of the optical imaging lens assembly, and the following condition is satisfied: 0,90 < ∑ CT / ∑ AT < 2,00.
  19. Optical imaging lens assembly according to Claim 15 , where the focal length of the first lens element (E1) is f1, the focal length of the third lens element (E3) is f3 and the following condition is met: 0,30 < | f1 / f3 | < 3,00.
  20. Optical imaging lens assembly according to Claim 15 , where the focal length of the second lens element (E2) is f2, the focal length of the third lens element (E3) is f3 and the following condition is met: 0,00 < | f3 / f2 | < 2,50.

Description

BACKGROUND field of expertise The present disclosure relates to an optical imaging lens assembly, an image acquisition unit and an electronic device, in particular an optical imaging lens assembly and an image acquisition unit that can be used in an electronic device. Description of related technology With the development of semiconductor manufacturing technology, the performance of image sensors has improved and their pixel size has decreased. Therefore, high image quality is now one of the essential features of an optical system. Furthermore, due to rapid technological advancements, electronic devices equipped with optical systems are increasingly becoming multifunctional for various applications, thereby raising the bar for the functionality of these optical systems. However, for a conventional optical system, it is challenging to strike a balance between requirements such as high image quality, low sensitivity, appropriate aperture, miniaturization, and a desirable field of view. SUMMARY According to one aspect of the present disclosure, an optical imaging lens assembly comprises four lens elements. The four lens elements are, in order from an object side to an image side along a beam path, a first lens element, a second lens element, a third lens element, and a fourth lens element. Each of the four lens elements has an object side facing the object side and an image-side surface facing the image side. Preferably, the first lens element has a positive refractive power. Preferably, the object-side surface of the second lens element is convex in a paraxial region. Preferably, the image-side surface of the second lens element is concave in a paraxial region. Preferably, the third lens element has a positive refractive power. Preferably, the fourth lens element has a negative refractive power. Preferably, the object-side surface of the fourth lens element is concave in a paraxial region. Preferably, the image-side surface of the fourth lens element is convex in a paraxial region. Preferably, at least one inflection point exists between the object-side surface and the image-side surface of at least one lens element of the optical imaging lens assembly. If an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is TD, an axial distance between the image-side surface of the fourth lens element and an image surface is BL, an absolute value of a focal length of the first lens element is |f1|, an absolute value of a focal length of the second lens element is |f2|, an absolute value of a focal length of the third lens element is |f3|, an absolute value of a focal length of the fourth lens element is |f4|, a maximum value of |f1|, |f2|, |f3| and |f4| is |fi|max, a central thickness of the third lens element is CT3, and an axial distance between the third lens element and the fourth lens element is T34, then the following conditions are preferably satisfied: 0,10<TD/BL<0,70;0,20<|f2|/|fi|max≤1,00; und0,10<CT3/T34<1,20. According to another aspect of the present disclosure, an optical imaging lens assembly comprises four lens elements. The four lens elements are, in order from an object side to an image side along a beam path, a first lens element, a second lens element, a third lens element, and a fourth lens element. Each of the four lens elements has an object-side A surface facing the object side and an image-side surface facing the image side. Preferably, the first lens element has a positive refractive power. Preferably, the object-side surface of the second lens element is convex in a paraxial region. Preferably, the image-side surface of the second lens element is concave in a paraxial region. Preferably, the third lens element has a positive refractive power. Preferably, the fourth lens element has a negative refractive power. Preferably, the object-side surface of the fourth lens element is concave in a paraxial region. Preferably, the image-side surface of the fourth lens element is convex in a paraxial region. If an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is TD, an axial distance between the image-side surface of the fourth lens element and an image surface is BL, an Abbe number of the fourth lens element is V4, a central thickness of the first lens element is CT1, an axial distance between the second lens element and the third lens element is T23, a radius of curvature of the object-side surface of the second lens element is R3, and a radius of curvature of the image-side surface of the third lens element is R6, then the following conditions are preferably met: 0,10<TD/BL<0,60;5,0<V4<40,0;1,00<CT1/T23<4,00; und0,00<|R3/R6|<0,80. According to another aspect of the present disclosure, an image acquisition unit comprises one of the above-mentioned optical imaging lens assemblies and an image sensor, wherein the image sensor is arranged on the image