Optical imaging lens

1. An optical imaging lens, comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element arranged in sequence from an object side to an image side along an optical axis, and each of the first lens element through the fifth lens element comprising an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through;

the image-side surface of the first lens element comprising a convex portion in an optical axis region; and at least one of the object-side surface and the image-side surface of the first lens element being an aspheric surface;

the second lens element comprising negative refractive power, the object-side surface of the second lens element comprising a convex portion in an optical axis region and a concave portion in a periphery region, and at least one of the object-side surface and the image-side surface of the second lens element being an aspheric surface;

the third lens element comprising positive refractive power, the image-side surface of the third lens element comprising a concave portion in an optical axis region, and at least one of the object-side surface and the image-side surface of the third lens element being an aspheric surface;

the object-side surface of the fourth lens element comprising a concave portion in an optical axis region, at least one of the object-side surface and the image-side surface of the fourth lens element being an aspheric surface; and

the object-side surface of the fifth lens element comprising a convex portion in an optical axis region, the object-side surface and the image-side surface of the fifth lens element being an aspheric surface;

wherein the number of lens elements of the optical imaging lens having refractive power are only five, and the optical imaging lens satisfies:

TTL

EFL

×

F

⁢

/

⁢

#

≤

2.3

wherein TTL is a distance from the object-side surface of the first lens element to an image plane of the optical imaging lens along the optical axis, EFL is an effective focal length of the optical imaging lens, F/# is an f-number of the optical imaging lens, and a ratio obtained by dividing a distance from the object-side surface of the third lens element to the object-side surface of the fifth lens element along the optical axis by a thickness of the fifth lens element along the optical axis is less than or equal to 2.25.

2. The optical imaging lens according to claim 1 , wherein the optical imaging lens further satisfies EFL/(G12+G45)≤27.00, wherein G12 is an air gap between the first lens element and the second lens element along the optical axis, and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis.

3. The optical imaging lens according to claim 1 , wherein the optical imaging lens further satisfies (T2+G23)/(G12+G45)≤2.90, wherein T2 is a thickness of the second lens element along the optical axis, G23 is an air gap between the second lens element and the third lens element along the optical axis, G12 is an air gap between the first lens element and the second lens element along the optical axis, and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis.

4. The optical imaging lens according to claim 1 , wherein the optical imaging lens further satisfies (T2+T3+T4)/(G12+G45)≤7.50, wherein T2 is a thickness of the second lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, T4 is a thickness of the fourth lens element along the optical axis, G12 is an air gap between the first lens element and the second lens element along the optical axis, and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis.

5. The optical imaging lens according to claim 1 , wherein the optical imaging lens further satisfies (T2+G23+T3)/(G12+G45)≤8.00, wherein T2 is a thickness of the second lens element along the optical axis, G23 is an air gap between the second lens element and the third lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, G12 is an air gap between the first lens element and the second lens element along the optical axis, and G45 is an air gap between the fourth lens element and the fifth lens element.

6. The optical imaging lens according to claim 1 , wherein the optical imaging lens further satisfies (T2+AAG)/(G12+G45)≤8.00, wherein T2 is a thickness of the second lens element along the optical axis, AAG is a sum of four air gaps among the first lens element through the fifth lens element along the optical axis, G12 is an air gap between the first lens element and the second lens element along the optical axis, and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis.

7. The optical imaging lens according to claim 1 , wherein the optical imaging lens further satisfies (T2+AAG)/T1≤1.60, wherein T2 is a thickness of the second lens element along the optical axis, AAG is a sum of four air gaps among the first lens element through the fifth lens element along the optical axis, and T1 is a thickness of the first lens element along the optical axis.

8. The optical imaging lens according to claim 1 , wherein the optical imaging lens further satisfies (T2+G23+T3)/T1≤1.50, wherein T2 is a thickness of the second lens element along the optical axis, G23 is an air gap between the second lens element and the third lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, and T1 is a thickness of the first lens element along the optical axis.

9. The optical imaging lens according to claim 1 , wherein the optical imaging lens further satisfies (T2+T3+T4)/T1≤1.70, wherein T2 is a thickness of the second lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, T4 is a thickness of the fourth lens element along the optical axis, and T1 is a thickness of the first lens element along the optical axis.

10. The optical imaging lens according to claim 1 , wherein the optical imaging lens further satisfies ALT/(T1+G12)≤3.60, wherein ALT is a sum of thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element along the optical axis, T1 is the thickness of the first lens element along the optical axis, and G12 is an air gap between the first lens element and the second lens element along the optical axis.

11. The optical imaging lens according to claim 10 , wherein the optical imaging lens further satisfies ALT/T4≤5.10, wherein T4 is a thickness of the fourth lens element along the optical axis.

12. The optical imaging lens according to claim 10 , wherein the optical imaging lens further satisfies AAG/T4≤1.70, wherein AAG is a sum of four air gaps among the first lens element through the fifth lens element along the optical axis, and T4 is a thickness of the fourth lens element along the optical axis.

13. The optical imaging lens according to claim 1 , wherein the optical imaging lens further satisfies ALT/T1≤4.00, wherein ALT is a sum of thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, and the fifth lens element along the optical axis, and T1 is the thickness of the first lens element along the optical axis.

14. The optical imaging lens according to claim 13 , wherein the optical imaging lens further satisfies ALT/(T4+G45)≤4.80, wherein T4 is a thickness of the fourth lens element along the optical axis, and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis.

15. The optical imaging lens according to claim 13 , wherein the optical imaging lens further satisfies AAG/(T4+G45)≤1.60, wherein AAG is a sum of four air gaps among the first lens element through the fifth lens element along the optical axis, and T4 is a thickness of the fourth lens element along the optical axis, and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis.

16. An optical imaging lens, comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element arranged in sequence from an object side to an image side along an optical axis, and each of the first lens element through the fifth lens element comprising an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through;

the image-side surface of the first lens element comprising a convex portion in an optical axis region; and at least one of the object-side surface and the image-side surface of the first lens element being an aspheric surface;

the second lens element comprising negative refractive power, the object-side surface of the second lens element comprising a convex portion in an optical axis region and a concave portion in a periphery region, and at least one of the object-side surface and the image-side surface of the second lens element being an aspheric surface;

the third lens element comprising positive refractive power, the image-side surface of the third lens element comprising a concave portion in an optical axis region, and at least one of the object-side surface and the image-side surface of the third lens element being an aspheric surface;

the object-side surface of the fourth lens element comprising a concave portion in an optical axis region, at least one of the object-side surface and the image-side surface of the fourth lens element being an aspheric surface; and

the object-side surface of the fifth lens element comprising a convex portion in an optical axis region, the object-side surface and the image-side surface of the fifth lens element being an aspheric surface;

wherein the number of lens elements of the optical imaging lens having refractive power is only five, and the optical imaging lens satisfies:

TTL

EFL

×

F

⁢

/

⁢

#

≤

2.3

wherein TTL is a distance from the object-side surface of the first lens element to an image plane of the optical imaging lens along the optical axis, EFL is an effective focal length of the optical imaging lens, F/# is an f-number of the optical imaging lens, and a ratio obtained by dividing a distance from the object-side surface of the second lens element to the object-side surface of the fifth lens element along the optical axis by a thickness of the fifth lens element along the optical axis is less than or equal to 3.00.

17. The optical imaging lens according to claim 16 , wherein the optical imaging lens further satisfies EFL/(G12+G45)≤27.00, wherein G12 is an air gap between the first lens element and the second lens element along the optical axis, and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis.

18. The optical imaging lens according to claim 16 , wherein the optical imaging lens further satisfies (T2+G23)/(G12+G45)≤2.90, wherein T2 is a thickness of the second lens element along the optical axis, G23 is an air gap between the second lens element and the third lens element along the optical axis, G12 is an air gap between the first lens element and the second lens element along the optical axis, and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis.

19. The optical imaging lens according to claim 16 , wherein the optical imaging lens further satisfies (T2+T3+T4)/(G12+G45)≤7.50, wherein T2 is a thickness of the second lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, T4 is a thickness of the fourth lens element along the optical axis, G12 is an air gap between the first lens element and the second lens element along the optical axis, and G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis.

20. An optical imaging lens, comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element arranged in sequence from an object side to an image side along an optical axis, and each of the first lens element through the fifth lens element comprising an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through;

the image-side surface of the first lens element comprising a convex portion in an optical axis region; and at least one of the object-side surface and the image-side surface of the first lens element being an aspheric surface;

the second lens element comprising negative refractive power, the object-side surface of the second lens element comprising a convex portion in an optical axis region and a concave portion in a periphery region, and at least one of the object-side surface and the image-side surface of the second lens element being an aspheric surface;

the third lens element comprising positive refractive power, the image-side surface of the third lens element comprising a concave portion in an optical axis region, and at least one of the object-side surface and the image-side surface of the third lens element being an aspheric surface;

the object-side surface of the fourth lens element comprising a concave portion in an optical axis region, at least one of the object-side surface and the image-side surface of the fourth lens element being an aspheric surface; and

the object-side surface of the fifth lens element comprising a convex portion in an optical axis region, the object-side surface and the image-side surface of the fifth lens element being an aspheric surface;

wherein the number of lens elements of the optical imaging lens having refractive power is only five, and the optical imaging lens satisfies:

TTL

EFL

×

F

⁢

/

⁢

#

≤

2.3

wherein TTL is a distance from the object-side surface of the first lens element to an image plane of the optical imaging lens along the optical axis, EFL is an effective focal length of the optical imaging lens, F/# is an f-number of the optical imaging lens, and a ratio obtained by dividing a distance from the object-side surface of the second lens element to the object-side surface of the fourth lens element along the optical axis by a thickness of the fifth lens element along the optical axis is less than or equal to 1.90.