Image capturing lens assembly, image capturing device and electronic device

1. An image capturing lens assembly comprising five lens elements, the five lens elements being, in order from an object side to an image side:

a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element; each of the five lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;

wherein the first lens element has positive refractive power; one of the five lens elements with positive refractive power has an Abbe number smaller than 30; the first lens element has greatest refractive power among the five lens elements;

wherein a central thickness of the first lens element is larger than a central thickness of the fifth lens element

wherein a total number of the lens elements in the image capturing lens assembly is five, an entrance pupil diameter of the image capturing lens assembly is EPD, a maximum image height of the image capturing lens assembly is ImgH, a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, a refractive index of the third lens element is N3, a refractive index of the fourth lens element is N4, a refractive index of the fifth lens element is N5, a maximum of N1, N2, N3, N4 and N5 is Nmax, and the following relationships are satisfied:

0.7< EPD /ImgH<2.0; and

1.65≤ N max <1.70.

2. The image capturing lens assembly of claim 1 , wherein the second lens element has negative refractive power; the object-side surface of the first lens element is convex in a paraxial region thereof; the object-side surface and the image-side surface of each of the five lens elements are aspheric; at least one of the five lens elements comprises at least one inflection point.

3. The image capturing lens assembly of claim 1 , wherein the fifth lens element comprises at least one inflection point; the five lens elements are made of plastic material; there is an air gap between each of adjacent lens elements of the five lens elements.

4. The image capturing lens assembly of claim 1 , wherein the object-side surface of the fifth lens element is concave in a paraxial region thereof, and the image-side surface of the fifth lens element is convex in a paraxial region thereof.

5. The image capturing lens assembly of claim 1 , wherein the entrance pupil diameter of the image capturing lens assembly is EPD, the maximum image height of the image capturing lens assembly is ImgH, and the following relationship is satisfied:

1.16≤ EPD /ImgH<2.0.

6. The image capturing lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, and the following relationship is satisfied:

−1.5<( R 1+ R 2)/( R 1− R 2)<0.

7. The image capturing lens assembly of claim 6 , wherein the curvature radius of the object-side surface of the first lens element is R1, the curvature radius of the image-side surface of the first lens element is R2, and the following relationship is satisfied:

−0.91≤( R 1+ R 2)/( R 1− R 2)<0.

8. The image capturing lens assembly of claim 1 , further comprising:

an aperture stop, wherein an axial distance between the aperture stop and the image-side surface of the fifth lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, and the following relationship is satisfied:

0.72≤ SD/TD< 1.0.

9. The image capturing lens assembly of claim 1 , wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, the maximum image height of the image capturing lens assembly is ImgH, and the following relationship is satisfied:

2.0< TL /ImgH≤2.87.

10. The image capturing lens assembly of claim 1 , wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following relationship is satisfied:

TL< 7.5 mm.

11. The image capturing lens assembly of claim 10 , wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, and the following relationship is satisfied:

TL≤ 5.98 mm.

12. The image capturing lens assembly of claim 1 , further comprising:

an aperture stop, wherein a focal length of the image capturing lens assembly is f, the maximum image height of the image capturing lens assembly is ImgH, an axial distance between the aperture stop and the image-side surface of the fifth lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, and the following relationships are satisfied:

2.3< f /ImgH<6.0; and

0.65< SD/TD< 1.0.

13. The image capturing lens assembly of claim 1 , wherein a focal length of the image capturing lens assembly is f, an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following relationship is satisfied:

0.75< TL/f< 1.0.

14. The image capturing lens assembly of claim 1 , wherein a half of a maximal field of view of the image capturing lens assembly is HFOV, and the following relationship is satisfied:

0.3<tan(2×HFOV)<1.1.

15. The image capturing lens assembly of claim 1 , wherein a focal length of the first lens element is f1, a focal length of the fourth lens element is f4, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, and the following relationships are satisfied:

−1.0< f 1/ f 4<0; and

T 34/ T 45<1.2.

16. The image capturing lens assembly of claim 1 , wherein a curvature radius of the image-side surface of the fourth lens element is R8, a curvature radius of the object-side surface of the fifth lens element is R9, and the following relationship is satisfied:

−0.1<( R 8+ R 9)/( R 8− R 9).

17. The image capturing lens assembly of claim 1 , wherein a composite focal length of the first lens element and the second lens element is f12, a composite focal length of the fourth lens element and the fifth lens element is f45, and the following relationship is satisfied:

−2.0< f 12/ f 45<0.

18. The image capturing lens assembly of claim 1 , wherein an axial distance between the fourth lens element and the fifth lens element is a maximum among axial distances between adjacent lens elements of the five lens elements.

19. The image capturing lens assembly of claim 1 , wherein the central thickness of the first lens element is a maximum among central thicknesses of the five lens elements.

20. The image capturing lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the second lens element and a curvature radius of the image-side surface of the second lens element have the same sign.

21. The image capturing lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the third lens element and a curvature radius of the image-side surface of the third lens element have the same sign.

22. The image capturing lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the fifth lens element and a curvature radius of the image-side surface of the fifth lens element have the same sign.

23. An image capturing device, comprising:

the image capturing lens assembly of claim 1 ; and

an image sensor disposed on an image surface of the image capturing lens assembly.

24. An electronic device, comprising:

the image capturing device of claim 23 .