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CN-117687183-B - Imaging lens group and camera module

CN117687183BCN 117687183 BCN117687183 BCN 117687183BCN-117687183-B

Abstract

The invention provides an imaging lens group which sequentially comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side, wherein the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the curvature radius of the object side surface of the third lens is R5, the curvature radius of the object side surface of the fourth lens is R7, the distance from the object side surface of the first lens to an imaging surface on an optical axis is TL, and the following conditions of 50.7< f 3R 7/TL <378.7, and-1375.8 < (f 2/f 4) R5< -21.5 are satisfied.

Inventors

  • WANG QICHANG

Assignees

  • 新钜科技股份有限公司

Dates

Publication Date
20260512
Application Date
20221021
Priority Date
20220905

Claims (14)

  1. 1. An imaging lens assembly, comprising, in order from an object side to an image side: A diaphragm; A first lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a concave image-side surface at a paraxial region; a third lens element with negative refractive power having a convex object-side surface and a concave image-side surface; A fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface, and A fifth lens element with negative refractive power having a concave image-side surface at a paraxial region thereof; The total number of lenses with refractive power in the imaging lens assembly is five, the focal length of the second lens element is f2, the focal length of the third lens element is f3, the focal length of the fourth lens element is f4, the radius of curvature of the image-side surface of the first lens element is R2, the radius of curvature of the object-side surface of the second lens element is R3, the radius of curvature of the object-side surface of the third lens element is R5, the radius of curvature of the image-side surface of the third lens element is R6, the radius of curvature of the object-side surface of the fourth lens element is R7, the distance from the object-side surface of the first lens element to the image plane on the optical axis is TL, and the following conditions are satisfied: 50.7mm < f3×r7/TL < 378.7mm, -1375.8mm < (f 2/f 4) ×r5< -21.5mm, and-657 < (r7+r6)/(r2+r3) < -8.7.
  2. 2. The imaging lens group according to claim 1, wherein a radius of curvature of an image side surface of the second lens is R4, and a radius of curvature of an object side surface of the fourth lens is R7, and the following condition is-9.9 < R7/R4< -1.2.
  3. 3. The imaging lens assembly of claim 1, wherein a distance between an object-side surface of the first lens element and an image-side surface of the fifth lens element on an optical axis is TD, a distance between an image-side surface of the fifth lens element and an imaging plane on the optical axis is BFL, and the following condition is 2.7< TD/BFL <4.9.
  4. 4. The imaging lens assembly of claim 1, wherein a distance from an image side surface of the fifth lens element to an image plane on an optical axis is BFL, a distance from the second lens element to the third lens element on the optical axis is T23, a distance from the third lens element to the fourth lens element on the optical axis is T34, and a condition of 0.8< BFL/(t23+t34) <2.7 is satisfied.
  5. 5. The imaging lens group as claimed in claim 1, wherein the second lens has an object-side surface radius of curvature of R3, and the third lens has an object-side surface radius of curvature of R5, and the following condition-2.6 < R5/R3<4.2 is satisfied.
  6. 6. The imaging lens assembly of claim 1 wherein said first lens has a focal length f1 and said second lens has a focal length f2 and satisfies the following condition-50.3 mm 2 ＜f1*f2＜-28.6mm 2 .
  7. 7. The imaging lens assembly of claim 1, wherein an object-side surface of the first lens element has an optical axis distance TL and an optical axis thickness CT2, and wherein 15.2< TL/CT2<30.6 is satisfied.
  8. 8. The imaging lens assembly of claim 1, wherein an amount of displacement from an intersection of an image side surface of the fourth lens element on an optical axis to a position of a maximum effective radius of an image side surface of the fourth lens element parallel to the optical axis is TDP8, an amount of displacement from an intersection of an object side surface of the fifth lens element on the optical axis to a position of a maximum effective radius of an object side surface of the fifth lens element parallel to the optical axis is TDP9, and a condition of 0.2< |TDP9/TDP8| <1.7 is satisfied.
  9. 9. The imaging lens assembly of claim 1, wherein an amount of displacement from an intersection of an object-side surface of the fourth lens element on an optical axis to a position of a maximum effective radius of the object-side surface of the fourth lens element parallel to the optical axis is TDP7, an amount of displacement from an intersection of an object-side surface of the fifth lens element on the optical axis to a position of a maximum effective radius of the object-side surface of the fifth lens element parallel to the optical axis is TDP9, and a condition of 0.6< |TDP9/TDP7| <1421.4 is satisfied.
  10. 10. The imaging lens assembly of claim 1, wherein a distance from an image side surface of the fifth lens element to the image plane on the optical axis is BFL, and a sum of distances between all adjacent lens elements in the imaging lens assembly along the optical axis is Σat, and a condition of 0.5< BFL/Σat <1.2 is satisfied.
  11. 11. The imaging lens group as claimed in claim 1, wherein a maximum imaging height of the imaging lens group is IMH, and a radius of curvature of an object-side surface of the fourth lens is R7, and the following condition-161.5 mm 2 ＜IMH*R7＜-33.1mm 2 is satisfied.
  12. 12. The imaging lens assembly of claim 1, wherein said fifth lens element has an object-side surface with a radius of curvature of R9, wherein half of said imaging lens assembly's maximum viewing angle is HFOV, and wherein said imaging lens assembly has an overall focal length of f, and wherein-2664.0 DEG < R9 > HFOV/f <70.9 DEG is satisfied.
  13. 13. The imaging lens assembly of claim 1 wherein half of the maximum viewing angle of the imaging lens assembly is HFOV, the overall focal length of the imaging lens assembly is f, the image side surface radius of curvature of the first lens is R2, and the condition 11.4 ° < HFOV/f/R2 <28.1 ° is satisfied.
  14. 14. A camera module, comprising: A lens barrel; An imaging lens group as claimed in any one of claims 1 to 13, provided in the barrel, and An image sensor is arranged on the imaging surface of the imaging lens group.

Description

Imaging lens group and camera module Technical Field The present invention relates to an imaging lens assembly, and more particularly, to an imaging lens assembly for an electronic device. Background Due to the rapid development of semiconductor manufacturing technology, for portability, a miniaturized optical lens is indispensable for a portable electronic device, and it is an important research direction to obtain a large aperture, high resolution, low distortion, and miniaturized optical lens. In the prior art, five-piece type small lenses such as mobile phones and tablet personal computers and other wearable electronic devices are often accompanied with the problem of manufacturing and assembling sensitivity during large aperture, so that mass production is not easy, further the manufacturing cost is high, in addition, in order to reduce the assembly tolerance, the imaging quality of the periphery is often required to be sacrificed, and the imaging of the periphery is blurred or deformed, which is a problem to be improved. Disclosure of Invention The present invention is directed to solving the above-mentioned problems of five-lens-element sensitivity and imaging quality of the large aperture, and the present invention provides an imaging lens assembly comprising, in order from an object side to an image side, a diaphragm, a first lens element with positive refractive power, a convex surface at a paraxial region of an object side surface of the first lens element, a concave surface at a paraxial region of an image side surface of the first lens element, a second lens element with negative refractive power, a concave surface at a paraxial region of an image side surface of the second lens element, a third lens element with negative refractive power, a convex surface at a paraxial region of an object side surface of the third lens element, a concave surface at a paraxial region of an image side surface of the third lens element, a fourth lens element with positive refractive power, a concave surface at a paraxial region of an object side surface of the fourth lens element, a convex surface at a paraxial region of an image side surface of the fourth lens element, and a fifth lens element with negative refractive power. The focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the curvature radius of the object side surface of the third lens is R5, the curvature radius of the object side surface of the fourth lens is R7, the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the following conditions are 50.7< f 3R 7/TL <378.7, and-1375.8 < (f 2/f 4) R5< -21.5 are satisfied. When the imaging lens group satisfies 50.7< f3×r7/TL <378.7 and-1375.8 < (f 2/f 4) ×r5< -21.5, the proper configuration can achieve the effects of reducing the sensitivity of the lens, reducing the assembly tolerance and improving the imaging quality. The total number of the lenses with refractive power in the imaging lens group is five. The curvature radius of the image side surface of the second lens is R4, the curvature radius of the object side surface of the fourth lens is R7, and the following conditions are satisfied that-9.9 < R7/R4< -1.2, by proper configuration of the curvature radius of the image side surface of the second lens and the curvature radius of the object side surface of the fourth lens, the field curvature of the imaging lens group can be effectively corrected, and the imaging quality of the periphery of a picture can be improved. The distance between the object side surface of the first lens and the image side surface of the fifth lens is TD, the distance between the image side surface of the fifth lens and the imaging surface is BFL, and the following conditions are satisfied that 2.7< TD/BFL <4.9, thereby providing enough back focal length to avoid interference of mechanism appearance. The distance from the image side surface of the fifth lens element to the image plane on the optical axis is BFL, the distance from the second lens element to the third lens element on the optical axis is T23, the distance from the third lens element to the fourth lens element on the optical axis is T34, and the following conditions are satisfied that 0.8< BFL/(T23+T34) <2.7, thereby providing a proper lens space and increasing the back focal length. The curvature radius of the object side surface of the second lens is R3, the curvature radius of the object side surface of the third lens is R5, and the following conditions are satisfied that R5/R3 is less than 2.6 and less than 4.2, thereby effectively correcting the field curvature of the imaging lens group and improving the imaging quality of the periphery of a picture. The focal length of the first lens is f1, the focal length of the second lens is f2, and the following conditions are satisfied that-50.3 < f1 x f2< -28.6, and the aberration of the ima