Imaging lens, image capturing unit and electronic device

Abstract

An imaging lens includes a plurality of lens elements, a lens barrel, a first opening element and a second opening element. The lens elements are arranged along an optical axis and include a first lens element. The lens barrel includes a tube portion and an opening portion. The tube portion surrounds the optical axis. The lens elements are disposed in the tube portion. The opening portion extends along a direction from the tube portion towards the optical axis. The opening portion has a barrel opening and a first step surface. The barrel opening is located on an object side of the first lens element. The first opening element is disposed between the first lens element and the opening portion to space the first lens element apart from the opening portion. The first opening element and the first step surface form a gap therebetween. The first opening element has a first light-passable opening disposed corresponding to the barrel opening. The second opening element is disposed in the gap. The second opening has a second light-passable opening disposed opposite to the first light-passable opening.

Claims

1. An imaging lens, comprising: a plurality of lenses arranged sequentially along an optical axis, wherein the lenses include a first lens, and the first lens is the one of the lenses closest to the object side of the imaging lens; a lens barrel, comprising: a tubular portion surrounding the optical axis, wherein the lenses are disposed in the tubular portion; and a through-hole portion extending from the tubular portion toward the optical axis, wherein the through-hole portion has a lens barrel light-transmitting hole and a first stepped surface, and the lens barrel light-transmitting hole is located on the object side of the first lens; a first through-hole element disposed between the first lens and the through-hole portion to space the first lens and the through-hole portion, wherein a gap is formed between the first through-hole element and the first stepped surface, the first through-hole element has a first light-transmitting hole, and the first light-transmitting hole is correspondingly disposed with respect to the lens barrel light-transmitting hole; and a second through-hole element disposed in the gap, wherein the second through-hole element has a second light-transmitting hole, and the second light-transmitting hole is opposite to the first light-transmitting hole.

2. The imaging lens as described in claim 1, wherein, The through-hole portion further has a second stepped surface, and the second stepped surface of the through-hole portion at least partially overlaps with the first lens in a direction parallel to the optical axis; wherein, the first through-hole element further has a third stepped surface, and the third stepped surface of the first through-hole element is in solid contact with the second stepped surface of the through-hole portion.

3. The imaging lens as described in claim 2, wherein the second stepped surface is farther from the optical axis than the first stepped surface; wherein, The through-hole portion further has a first connecting surface, and the first connecting surface connects the first step surface and the second step surface; wherein, the first through-hole element further has a second connecting surface, and the second connecting surface extends from the side of the third step surface near the optical axis toward the first step surface; wherein, the first connecting surface and the second connecting surface are spaced apart, and the through-hole portion and the first through-hole element respectively contact the second through-hole element through the first connecting surface and the second connecting surface.

4. The imaging lens as claimed in claim 3, wherein the first through-hole element further has a fourth stepped surface, the fourth stepped surface extending from the side of the second connecting surface near the first stepped surface toward the optical axis, and the gap is formed between the fourth stepped surface and the first stepped surface.

5. The imaging lens as claimed in claim 2, wherein the minimum width of the gap between the first stepped surface and the first through-hole element in the direction parallel to the optical axis is G, and the shortest distance between the first stepped surface and the second stepped surface in the direction parallel to the optical axis is D12, which satisfies the following condition: 0.06 ≤ G / D12 ≤ 0.

5.

6. The imaging lens as claimed in claim 2, wherein the minimum thickness of the through-hole portion at the first stepped surface in the direction parallel to the optical axis is less than the minimum thickness of the through-hole portion at the second stepped surface in the direction parallel to the optical axis.

7. The imaging lens as claimed in claim 1, wherein the second through-hole element is a light-shielding plate; wherein, The minimum width of the gap between the first stepped surface and the first through-hole element in the direction parallel to the optical axis is G, and the thickness of the light-shielding sheet is T, which satisfies the following conditions: 1.03 ≤ G / T ≤ 1.

97.

8. The imaging lens as claimed in claim 1, wherein the through-hole portion further has a first conical surface, the first conical surface being away from the optical axis in a direction close to the second through-hole element, the first conical surface including an anti-reflective structure surrounding the optical axis, and the anti-reflective structure including a plurality of protrusions.

9. The imaging lens as claimed in claim 1, wherein the first through-hole element further has a second conical surface that is away from the optical axis in a direction close to the second through-hole element, the second conical surface including an anti-reflective structure surrounding the optical axis, and the anti-reflective structure including a plurality of protrusions.

10. The imaging lens as claimed in claim 1, wherein the lens barrel aperture, the first aperture, and the second aperture each have a maximum opening diameter; wherein, The maximum opening diameter of the light-transmitting aperture of the lens tube is Dib, the maximum opening diameter of the first light-transmitting aperture is Di1, and the maximum opening diameter of the second light-transmitting aperture is Di2, which satisfy the following conditions: 0.85 ≤ Dib / Di2 ≤ 1.15; and 0.85 ≤ Di1 / Di2 ≤ 1.

15.

11. The imaging lens as claimed in claim 1, wherein the minimum thickness of the through-hole portion at the first stepped surface in the direction parallel to the optical axis is T1, and the thickness of the first through-hole element in the direction parallel to the optical axis is TS1, which satisfies the following condition: 0.14 ≤ T1 / TS1 ≤ 0.

92.

12. The imaging lens as claimed in claim 1, wherein the shortest distance between the first lens and the first light-transmitting aperture is less than the shortest distance between the second through-hole element and the first light-transmitting aperture.

13. The imaging lens as claimed in claim 1, wherein the shortest distance between the first lens and the first light aperture is less than the shortest distance between the first lens and the second light aperture.

14. An imaging lens, comprising: a plurality of lenses arranged sequentially along an optical axis, wherein the lenses include a first lens; a lens barrel, comprising: a tubular portion surrounding the optical axis, wherein the lenses are disposed in the tubular portion; and a through-hole portion extending from the tubular portion toward the optical axis, wherein the through-hole portion has a lens barrel light-transmitting hole and a first stepped surface; a first through-hole element, the side of which is away from the through-hole portion for the first lens to rest against, wherein a gap is formed between the first through-hole element and the first stepped surface, the first through-hole element having a first light-transmitting hole, and the first light-transmitting hole being correspondingly disposed with respect to the lens barrel light-transmitting hole; and a second through-hole element disposed in the gap, wherein the second through-hole element having a second light-transmitting hole, and the second light-transmitting hole being opposite to the first light-transmitting hole.

15. The imaging lens as claimed in claim 14, wherein the through-hole portion further has a second stepped surface, and the second stepped surface is farther away from the lens barrel light-transmitting aperture than the first stepped surface; wherein, The first through-hole element further has a third stepped surface, and the third stepped surface of the first through-hole element is in solid contact with the second stepped surface of the through-hole portion; wherein, the minimum width of the gap between the first stepped surface and the first through-hole element in the direction parallel to the optical axis is G, and the shortest distance between the first stepped surface and the second stepped surface in the direction parallel to the optical axis is D12, which satisfies the following condition: 0.06 ≤ G / D12 ≤ 0.

5.

16. The imaging lens as claimed in claim 15, wherein the second stepped surface is farther from the optical axis than the first stepped surface; wherein, The through-hole portion further has a first connecting surface, and the first connecting surface connects the first step surface and the second step surface; wherein, the first through-hole element further has a second connecting surface, and the second connecting surface extends from the side of the third step surface near the optical axis toward the first step surface; wherein, the first connecting surface and the second connecting surface are spaced apart, and the through-hole portion and the first through-hole element respectively contact the second through-hole element through the first connecting surface and the second connecting surface.

17. The imaging lens as claimed in claim 14, wherein the second through-hole element is a light-shielding plate; wherein, The minimum width of the gap between the first stepped surface and the first through-hole element in the direction parallel to the optical axis is G, and the thickness of the light-shielding sheet is T, which satisfies the following conditions: 1.03 ≤ G / T ≤ 1.

97.

18. The imaging lens as claimed in claim 14, wherein the through-hole portion further comprises a first conical surface, the first conical surface being located away from the optical axis in a direction closer to the second through-hole element from the lens barrel light-transmitting aperture; wherein, The first through-hole element further has a second conical surface, which is located away from the optical axis from the first light-transmitting hole in a direction closer to the second through-hole element; wherein at least one of the first conical surface and the second conical surface includes an anti-reflection structure, which surrounds the optical axis and includes a plurality of protrusions.

19. The imaging lens as claimed in claim 14, wherein the lens barrel aperture, the first aperture, and the second aperture each have a maximum opening diameter; wherein, The maximum opening diameter of the light-transmitting aperture of the lens tube is Dib, the maximum opening diameter of the first light-transmitting aperture is Di1, and the maximum opening diameter of the second light-transmitting aperture is Di2, which satisfy the following conditions: 0.8 ≤ Dib / Di2 ≤ 1.2; and 0.8 ≤ Di1 / Di2 ≤ 1.

2.

20. The imaging lens as claimed in claim 14, wherein the minimum thickness of the through-hole portion at the first stepped surface in the direction parallel to the optical axis is T1, and the thickness of the first through-hole element in the direction parallel to the optical axis is TS1, which satisfies the following condition: 0.14 ≤ T1 / TS1 ≤ 0.

92.

21. The imaging lens as claimed in claim 14, wherein the shortest distance between the first lens and the first light-transmitting aperture is less than the shortest distance between the second through-hole element and the first light-transmitting aperture.

22. An imaging lens, comprising: a plurality of lenses arranged sequentially along an optical axis, wherein the lenses include a first lens; a lens barrel, comprising: a tubular portion surrounding the optical axis, wherein the lenses are disposed in the tubular portion; and a lens barrel through-hole element fixed to the tubular portion, wherein the lens barrel through-hole element has a through-hole portion extending toward the optical axis, and the through-hole portion has a lens barrel light-transmitting aperture and a first stepped surface; a first through-hole element having a side away from the through-hole portion for the first lens to rest against, wherein a gap is formed between the first through-hole element and the first stepped surface, the first through-hole element having a first light-transmitting aperture, and the first light-transmitting aperture being correspondingly disposed with respect to the lens barrel light-transmitting aperture; and a second through-hole element disposed in the gap, wherein the second through-hole element has a second light-transmitting aperture, and the second light-transmitting aperture being opposite to the first light-transmitting aperture.

23. The imaging lens as claimed in claim 22, wherein the through-hole portion further has a second stepped surface, and the second stepped surface is farther away from the lens barrel light-transmitting aperture than the first stepped surface; wherein, The first through-hole element is in contact with the second stepped surface of the through-hole portion; wherein, the minimum width of the gap between the first stepped surface and the first through-hole element in the direction parallel to the optical axis is G, and the shortest distance between the first stepped surface and the second stepped surface in the direction parallel to the optical axis is D12, which satisfies the following condition: 0.06 ≤ G / D12 ≤ 0.

5.

24. The imaging lens as claimed in claim 22, wherein the second through-hole element is a light-shielding plate; wherein, The minimum width of the gap between the first stepped surface and the first through-hole element in the direction parallel to the optical axis is G, and the thickness of the light-shielding sheet is T, which satisfies the following conditions: 1.03 ≤ G / T ≤ 1.

97.

25. The imaging lens as claimed in claim 22, wherein the through-hole portion further has a first conical surface, the first conical surface being located away from the optical axis in a direction closer to the second through-hole element from the lens barrel light-transmitting hole; wherein, The first through-hole element further has a second conical surface, which is located away from the optical axis from the first light-transmitting hole in a direction closer to the second through-hole element; wherein at least one of the first conical surface and the second conical surface includes an anti-reflection structure, which surrounds the optical axis and includes a plurality of protrusions.

26. The imaging lens as claimed in claim 22, wherein the lens barrel aperture, the first aperture, and the second aperture each have a maximum opening diameter; wherein, The maximum opening diameter of the light-transmitting aperture of the lens tube is Dib, the maximum opening diameter of the first light-transmitting aperture is Di1, and the maximum opening diameter of the second light-transmitting aperture is Di2, which satisfy the following conditions: 0.8 ≤ Dib / Di2 ≤ 1.2; and 0.8 ≤ Di1 / Di2 ≤ 1.

2.

27. The imaging lens as claimed in claim 22, wherein the minimum thickness of the through-hole portion at the first stepped surface in the direction parallel to the optical axis is T1, and the thickness of the first through-hole element in the direction parallel to the optical axis is TS1, which satisfies the following condition: 0.14 ≤ T1 / TS1 ≤ 0.

92.

28. The imaging lens as claimed in claim 22, wherein the shortest distance between the first lens and the first light-transmitting aperture is less than the shortest distance between the second through-hole element and the first light-transmitting aperture.

29. An image capturing device comprising: an imaging lens as described in any one of claims 1, 14, and 22.

30. An electronic device comprising: an image capturing device as described in claim 29.

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