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US-20260126648-A1 - IMAGING LENS ASSEMBLY AND ELECTRONIC DEVICE

US20260126648A1US 20260126648 A1US20260126648 A1US 20260126648A1US-20260126648-A1

Abstract

An imaging lens assembly includes a plurality of optical lens elements, a single-piece-formed light blocking sheet and a lens barrel. The lens barrel has a circular light-passing hole corresponding to the plurality of optical lens elements and the single-piece-formed light blocking sheet. The single-piece-formed light blocking sheet has a central aperture corresponding to the lens barrel and the plurality of optical lens elements. A maximum aperture diameter is defined by the central aperture. The single-piece-formed light blocking sheet comprises a plurality of light blocking structures surrounding and disposed adjacent to the central aperture. A minimum inner radius of the central aperture is defined near the center of each of the light blocking structures.

Inventors

  • Chih-Wen Hsu
  • Hsiu-Yi HSIAO
  • Ming-Ta Chou

Assignees

  • LARGAN PRECISION CO., LTD.

Dates

Publication Date
20260507
Application Date
20251218

Claims (20)

  1. 1 . An imaging lens assembly, comprising: a plurality of optical lens elements; a light blocking sheet having a central aperture; and a lens barrel having a light-passing hole corresponding to the plurality of optical lens elements and the central aperture; wherein the light blocking sheet comprises a plurality of light blocking structures surrounding and disposed adjacent to the central aperture, a number of the plurality of light blocking structures is three to ten, a center of each of the light blocking structures is closer to a center of the central aperture than two ends of each of the light blocking structures; wherein a maximum aperture radius of the central aperture is Rmax, a minimum inner radius of the central aperture is Rmin, a roundness coefficient of the central aperture is tc, and the following condition is satisfied: 0.41 % ≤ tc ≤ 10.2 % , wherein ⁢ tc = ( ( Rmax - Rmin ) / Rmax ) × 100 ⁢ % ; wherein the light blocking sheet further comprises a plurality of radius structures, the plurality of radius structures surround and are disposed adjacent to the central aperture, a number of the plurality of radius structures is three to ten, each of the radius structures is connected to two of the light blocking structures adjacent thereto, and each of the radius structures is arc-shaped.
  2. 2 . The imaging lens assembly of claim 1 , wherein a curvature radius of each of the radius structures is R, and the following condition is satisfied: 0.25 mm < R < 4.2 mm .
  3. 3 . The imaging lens assembly of claim 1 , wherein the maximum aperture radius of the central aperture is Rmax, a curvature radius of each of the radius structures is R, and the following condition is satisfied: R = Rmax .
  4. 4 . The imaging lens assembly of claim 1 , wherein the plurality of radius structures and the plurality of light blocking structures are disposed alternately and surround the central aperture.
  5. 5 . The imaging lens assembly of claim 1 , wherein a focal length of the imaging lens assembly is f, the maximum aperture radius of the central aperture is Rmax, and the following condition is satisfied: 0.9 < F < 3.25 , wherein ⁢ F = f / 2 ⁢ Rmax .
  6. 6 . The imaging lens assembly of claim 1 , wherein each of the light blocking structures is a straight-line segment.
  7. 7 . The imaging lens assembly of claim 1 , wherein the roundness coefficient of the central aperture is tc, and the following condition is satisfied: 0.83 % ≤ tc ≤ 8.6 % .
  8. 8 . The imaging lens assembly of claim 1 , wherein the number of the plurality of light blocking structures is four, and the number of the plurality of radius structures is four.
  9. 9 . The imaging lens assembly of claim 1 , wherein each of the light blocking structures comprises a plurality of protrusions.
  10. 10 . The imaging lens assembly of claim 1 , wherein a thickness of the light blocking sheet is S, and the following condition is satisfied: 5 ⁢ μm < S < 210 ⁢ μm .
  11. 11 . An electronic device, comprising: the imaging lens assembly of claim 1 ; and an image sensor, wherein the image sensor is disposed on an image surface of the imaging lens assembly.
  12. 12 . An imaging lens assembly, comprising: a plurality of optical lens elements; a light blocking sheet having a central aperture; and a lens barrel having a light-passing hole corresponding to the plurality of optical lens elements and the central aperture; wherein the light blocking sheet comprises a plurality of light blocking structures surrounding and disposed adjacent to the central aperture, a number of the plurality of light blocking structures is three to ten, a center of each of the light blocking structures is closer to a center of the central aperture than two ends of each of the light blocking structures; wherein the light blocking sheet further comprises a plurality of radius structures, the plurality of radius structures surround and are disposed adjacent to the central aperture, a number of the plurality of radius structures is three to ten, each of the radius structures is connected to two of the light blocking structures adjacent thereto, and each of the radius structures is arc-shaped; wherein each of the light blocking structures comprises a plurality of protrusions.
  13. 13 . The imaging lens assembly of claim 12 , wherein the plurality of protrusions comprises: at least one first arc, a curvature center of the first arc is in a direction towards the center of the central aperture and has a first radius being r 1 ; and at least one second arc, a curvature center of the second arc is in a direction away from the center of the central aperture and has a second radius being r 2 , and the at least one first arc and the at least one second arc are disposed alternately.
  14. 14 . The imaging lens assembly of claim 13 , wherein the plurality of protrusions further comprises: at least one third arc, the at least one third arc is disposed on at least one of two ends of each of the light blocking structures.
  15. 15 . The imaging lens assembly of claim 14 , wherein the first radius of the at least one first arc is r 1 , the second radius of the at least one second arc is r 2 , a third radius of the at least one third arc is r 3 , and the following conditions are satisfied: 0 < r ⁢ 1 / r ⁢ 3 ≤ 1 ; and 0 < r ⁢ 2 / r ⁢ 3 ≤ 1.
  16. 16 . The imaging lens assembly of claim 13 , wherein the first radius of the at least one first arc is r 1 , the second radius of the at least one second arc is r 2 , and the following condition is satisfied: 1. < r ⁢ 1 / r ⁢ 2 < 3. .
  17. 17 . The imaging lens assembly of claim 12 , wherein the light blocking sheet comprises: a first surface layer; a second surface layer; and an inner substrate layer is disposed between the first surface layer and the second surface layer.
  18. 18 . The imaging lens assembly of claim 17 , wherein the inner substrate layer comprises plastic material, and each of the first surface layer and the second surface layer comprises carbon material.
  19. 19 . The imaging lens assembly of claim 17 , wherein the light blocking sheet further comprises an air layer, the air layer is disposed between the first surface layer and the second surface layer, and is closer to the central aperture than the inner substrate layer.
  20. 20 . The imaging lens assembly of claim 17 , wherein a thickness of the light blocking sheet is S, a thickness of the inner substrate layer is d, and the following condition is satisfied: 0.2 < d / S < 0.8 .

Description

RELATED APPLICATIONS This application is a Continuation-in-part of U.S. application Ser. No. 18/192,837, filed on Mar. 30, 2023, which claims priority to U.S. Provisional Application Ser. No. 63/328,757, filed Apr. 8, 2022, which is herein incorporated by reference. BACKGROUND Technical Field The present disclosure relates to an imaging lens assembly and an electronic device. More particularly, the present disclosure relates to an imaging lens assembly which can be applied to portable electronic devices. Description of Related Art In recent years, because the rapid development of portable electronic devices, such as intelligent electronic devices, tablets, etc., are found throughout modern people's whole lives, the imaging lens assemblies applied to portable electronic devices have also flourished. However, with the continuous advancement of technology, users have more requirements for the quality of imaging lens assemblies. SUMMARY According to one aspect of the present disclosure, an imaging lens assembly includes a plurality of optical lens elements, a light blocking sheet and a lens barrel. The light blocking sheet has a central aperture. The lens barrel has a light-passing hole corresponding to the plurality of optical lens elements and the central aperture. The light blocking sheet includes a plurality of light blocking structures surrounding and is disposed adjacent to the central aperture, a number of the plurality of light blocking structures is three to ten, a center of each of the light blocking structures is closer to a center of the central aperture than two ends of each of the light blocking structures. When a maximum aperture radius of the central aperture is Rmax, a minimum inner radius of the central aperture is Rmin, and a roundness coefficient of the central aperture is tc, the following condition is satisfied: 0.41%≤tc≤10.2%, wherein tc=((Rmax−Rmin)/Rmax)×100%. The light blocking sheet further includes a plurality of radius structures, the plurality of radius structures surround and are disposed adjacent to the central aperture, a number of the plurality of radius structures is three to ten, each of the radius structures is connected to two of the light blocking structures adjacent thereto, and each of the radius structures is arc-shaped. According to one aspect of the present disclosure, an electronic device includes the imaging lens assembly according to the aforementioned aspect and an image sensor disposed on an image surface of the imaging lens assembly. According to one aspect of the present disclosure, an imaging lens assembly includes a plurality of optical lens elements, a light blocking sheet and a lens barrel. The light blocking sheet has a central aperture. The lens barrel has a light-passing hole corresponding to the plurality of optical lens elements and the central aperture. The light blocking sheet includes a plurality of light blocking structures surrounding and is disposed adjacent to the central aperture, a number of the plurality of light blocking structures is three to ten, a center of each of the light blocking structures is closer to a center of the central aperture than two ends of each of the light blocking structures. The light blocking sheet further includes a plurality of radius structures, the plurality of radius structures surround and are disposed adjacent to the central aperture, a number of the plurality of radius structures is three to ten, each of the radius structures is connected to two of the light blocking structures adjacent thereto, and each of the radius structures is arc-shaped. Each of the light blocking structures includes a plurality of protrusions. BRIEF DESCRIPTION OF THE DRAWINGS The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows: FIG. 1A is a schematic view of an imaging lens assembly according to the 1st embodiment of the present disclosure. FIG. 1B is an exploded view of the imaging lens assembly of FIG. 1A. FIG. 2A is a cross-sectional view of a single-piece-formed light blocking sheet of the imaging lens assembly according to the 1st example of the 1st embodiment of FIG. 1A. FIG. 2B is a schematic view of the single-piece-formed light blocking sheet of FIG. 2A. FIG. 3A is a cross-sectional view of a single-piece-formed light blocking sheet of the imaging lens assembly according to the 2nd example of the 1st embodiment of FIG. 1A. FIG. 3B is a schematic view of the single-piece-formed light blocking sheet of FIG. 3A. FIG. 4A is a cross-sectional view of a single-piece-formed light blocking sheet of the imaging lens assembly according to the 3rd example of the 1st embodiment of FIG. 1A. FIG. 4B is a schematic view of the single-piece-formed light blocking sheet of FIG. 4A. FIG. 5A is a cross-sectional view of a single-piece-formed light blocking sheet of the imaging lens assembly according to the 4th example of t