Photographing optical system, image capturing unit and electronic device

Abstract

A photographic optical system includes five lenses. The five lenses, arranged sequentially from the object side to the image side along the optical path, are a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. Each of the five lenses has an object-side surface facing the object side and an image-side surface facing the image side. The first lens has positive refractive power. The object-side surface of the second lens is concave near the optical axis. The fifth lens has negative refractive power, and its image-side surface is concave near the optical axis. Under certain conditions, the photographic optical system can simultaneously meet the requirements of miniaturization and high image quality.

Claims

1. A photographic optical system comprising five lenses, which are sequentially arranged from the object side to the image side along a light path as a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, and each of the five lenses has an object-side surface facing the object side and an image-side surface facing the image side; wherein, The first lens has positive refractive power; the object-side surface of the second lens is concave near the optical axis, and the image-side surface of the second lens is convex near the optical axis; the fifth lens has negative refractive power, and its image-side surface is concave near the optical axis. The Abbe number of the second lens is V2, the Abbe number of the third lens is V3, the Abbe number of the fourth lens is V4, the thickness of the fifth lens along the optical axis is CT5, the distance between the third and fourth lenses along the optical axis is T34, the focal length of the photographic optical system is f, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4, satisfying the following conditions: 40.0 < V2 + V3 + V4 < 80.0; 0.00 < CT5 / T34 < 1.00; and 0.00 < |f / f2| + |f / f3| + |f / f4|. < 1.

00.

2. The photographic optical system as claimed in claim 1, wherein the object-side surface of the first lens is convex near the optical axis, the image-side surface of the first lens is concave near the optical axis, the image-side surface of the third lens is convex near the optical axis, the object-side surface of the fifth lens is convex near the optical axis, and the image-side surface of the fifth lens has at least one critical point off-axis.

3. The photographic optical system as claimed in claim 1, wherein the maximum imaging height of the photographic optical system is ImgH, and the focal length of the photographic optical system is f, which satisfies the following condition: 0.90 < ImgH / f < 1.

20.

4. The photographic optical system as claimed in claim 1, wherein the distance between the first lens and the second lens on the optical axis is T12, and the distance between the fourth lens and the fifth lens on the optical axis is T45, which satisfies the following condition: 0.10 < T12 / T45 < 0.

60.

5. The photographic optical system as claimed in claim 1, wherein the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the third lens is Dr1r6, and the distance on the optical axis from the image-side surface of the third lens to the image-side surface of the fifth lens is Dr6r10, which satisfies the following condition: 0.20 < Dr1r6 / Dr6r10 < 1.

00.

6. The photographic optical system as claimed in claim 1, wherein the radius of curvature of the image-side surface of the first lens is R2 and the radius of curvature of the image-side surface of the second lens is R4, which satisfy the following condition: 0.00 < |R2 / R4| < 1.

00.

7. The photographic optical system as claimed in claim 1, wherein the radius of curvature of the image-side surface of the second lens is R4 and the radius of curvature of the object-side surface of the third lens is R5, which satisfies the following condition: -0.10 < (R4-R5) / (R4+R5) < 12.

00.

8. The photographic optical system as claimed in claim 1, wherein the distance from the object-side surface of the first lens to an imaging surface on the optical axis is TL, and the radius of curvature of the object-side surface of the fourth lens is R7, which satisfies the following condition: -0.30 < TL / R7 < 1.

40.

9. The photographic optical system as claimed in claim 1, wherein the distance from the image-side surface of the fifth lens to an imaging plane on the optical axis is BL, the distance between the third lens and the fourth lens on the optical axis is T34, the thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT5, which satisfy the following conditions: 0.40 < BL / T34 < 2.00; and 0.40 < CT4 / CT5 < 1.

40.

10. An image capturing device comprising: a photographic optical system as described in claim 1; and an electronic photosensitive element disposed on an imaging surface of the photographic optical system.

11. An electronic device comprising: an image capturing device as described in claim 10.

12. A photographic optical system comprising five lenses, which are sequentially arranged along a light path from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, and each of the five lenses has an object-side surface facing the object side and an image-side surface facing the image side; wherein, The first lens has positive refractive power, the image-side surface of the second lens is convex near the optical axis, the image-side surface of the third lens is convex near the optical axis, the object-side surface of the fifth lens is convex near the optical axis, and the object-side surface of the fifth lens has at least one inflection point; wherein, the Abbe number of the second lens is V2, the Abbe number of the third lens is V3, the Abbe number of the fourth lens is V4, the thickness of the fifth lens on the optical axis is CT5, the optical axis spacing between the first lens and the second lens is T12, the optical axis spacing between the third lens and the fourth lens is T34, and the optical axis spacing between the fourth lens and the fifth lens is T45, which satisfy the following conditions: 30.0 < V2+V3+V4 < 90.0; 0.00 < CT5 / T34 < 1.00; and 0.00 < T12 / T45 < 0.

70.

13. The photographic optical system as claimed in claim 12, wherein the object-side surface of the first lens is convex near the optical axis, the image-side surface of the first lens is concave near the optical axis, the object-side surface of the second lens is concave near the optical axis, the fifth lens has negative refractive power, and the image-side surface of the fifth lens is concave near the optical axis.

14. The photographic optical system as claimed in claim 12, wherein the distance on the optical axis from the object-side surface of the first lens to an imaging surface is TL, the maximum imaging height of the photographic optical system is ImgH, the maximum effective radius of the image-side surface of the third lens is Y3R2, and the maximum effective radius of the image-side surface of the fifth lens is Y5R2, which satisfy the following conditions: 0.80 < TL / ImgH < 1.30; and 2.00 < Y5R2 / Y3R2 < 4.

50.

15. The photographic optical system as claimed in claim 12, wherein the distance on the optical axis from the object-side surface of the first lens to an imaging surface is TL, and the radius of curvature of the image-side surface of the fourth lens is R8, which satisfies the following condition: -0.20 < TL / R8 < 1.

30.

16. The photographic optical system as claimed in claim 12, wherein the focal length of the photographic optical system is f, the focal length of the third lens is f3, the focal length of the fifth lens is f5, and the combined focal length of the third lens and the fourth lens is f34, which satisfies the following conditions: 0.00 ≤ |f5 / f3| < 1.00; and -0.50 < f / f34 < 0.

40.

17. The photographic optical system as claimed in claim 12, wherein the distance between the third lens and the fourth lens on the optical axis is the largest among the distances between all adjacent lenses on the optical axis in the photographic optical system; wherein, The first lens has a focal length of f1, and the second lens has a focal length of f2, satisfying the following condition: 0.00 < |f1 / f2| < 1.

00.

18. The photographic optical system as claimed in claim 12, wherein the focal length of the photographic optical system is f, 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 Abbe number of the second lens is V2, the Abbe number of the third lens is V3, and the Abbe number of the fourth lens is V4, which satisfy the following conditions: 0.10 < |f / f2|+|f / f3|+|f / f4| < 0.80; and 35.0 < V2+V3+V4 < 85.

0.

19. The photographic optical system as claimed in claim 12, wherein the radius of curvature of the object-side surface of the second lens is R3, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the object-side surface of the fourth lens is R7, and the radius of curvature of the object-side surface of the fifth lens is R9, which satisfy the following conditions: 0.00 < |R9 / R7| < 1.10; and 0.00 < |R3 / R5| < 1.

10.

20. A photographic optical system as claimed in claim 12, wherein the Abbe number of the second lens is V2, the Abbe number of the third lens is V3, the Abbe number of the fourth lens is V4, the thickness of the fifth lens on the optical axis is CT5, the optical axis spacing between the first and second lenses is T12, the optical axis spacing between the third and fourth lenses is T34, the optical axis spacing between the fourth and fifth lenses is T45, the focal length of the photographic optical system is f, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4, satisfying the following conditions: 48.9 ≤ V2+V3+V4 ≤ 76.4; 0.46 ≤ CT5 / T34 ≤ 0.90; 0.20 ≤ T12 / T45 ≤ 0.40; and 0.20 ≤ |f / f2|+|f / f3|+|f / f4| ≤ 0.72.

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