Optical imaging lens

1. An optical imaging lens, sequentially comprising a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element along an optical axis from an object side to an image side, each of the first to sixth lens elements having an object side surface facing toward the object side and allowing an imaging ray to pass through and an image side surface facing toward the image side and allowing the imaging ray to pass through, the optical imaging lens further comprising an aperture stop located between the object side and the image side, wherein:

the first lens element is a lens element having refracting power in a first order from the object side to the image side,

the second lens element is a lens element having refracting power in a second order from the object side to the image side, and the second lens element has negative refracting power,

the third lens element is a lens element having refracting power in a third order from the object side to the image side,

the fourth lens element is a lens element having refracting power in a third order from the image side to the object side, and a periphery region of the object side surface of the fourth lens element is convex,

the fifth lens element is a lens element having refracting power in a second order from the image side to the object side, and a periphery region of the image side surface of the fifth lens element is convex,

the sixth lens element is a lens element having refracting power in a first order from the image side to the object side, and

the optical imaging lens satisfies conditions as follows:

HFOV≤45°, wherein HFOV is a half field of view of the optical imaging lens;

2.000≤D 1 /D2, wherein D1 is an effective radius of the object side surface of the first lens element, and D2 is a radius of the aperture stop; and

TTL/T6≤6.300, wherein TTL is a distance between the object side surface of the first lens element and an image plane of the optical imaging lens along the optical axis, and T6 is a thickness of the sixth lens element along the optical axis.

2. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

TTL/(T4+T6)≤3.800, wherein T4 is a thickness of the fourth lens element along the optical axis.

3. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

TTL/(T1+T6)≤5.000, wherein T1 is a thickness of the first lens element along the optical axis.

4. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

TTL/(T1+G12+T2+G23+T3)≤4.800, wherein T1 is a thickness of the first lens element along the optical axis, G12 is a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, G23 is a distance between the image side surface of the second lens element to the object side surface of the third lens element along the optical axis, and T3 is a thickness of the third lens element along the optical axis.

5. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

TL/(T1+G12+G45+G56)≤7.000, wherein TL is a distance between the object side surface of the first lens element and the image side surface of the sixth lens element along the optical axis, T1 is a thickness of the first lens element along the optical axis, G12 is a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, G45 is a distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element along the optical axis, and G56 is a distance between the image side surface of the fifth lens element to the object side surface of the sixth lens element along the optical axis.

6. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

TL/(T1+T2+T3)≤7.000, wherein TL is a distance between the object side surface of the first lens element and the image side surface of the sixth lens element along the optical axis, T1 is a thickness of the first lens element along the optical axis, T2 is a thickness of the second lens element along the optical axis, and T3 is a thickness of the third lens element along the optical axis.

7. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

ALT/(G12+G34)≤8.400, wherein ALT is a total of thicknesses of all the lens elements having refracting power of the optical imaging lens along the optical axis, G12 is a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, and G34 is a distance between the image side surface of the third lens element and the object side surface of the fourth lens element along the optical axis.

8. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

ALT/(T2+G23)≤8.900, wherein ALT is a total of thicknesses of all the lens elements having refracting power of the optical imaging lens along the optical axis, T2 is a thickness of the second lens element along the optical axis, and G23 is a distance between the image side surface of the second lens element and the object side surface of the third lens element along the optical axis.

9. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

AAG/(T5+G56)≤4.700, wherein AAG is a sum of a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, a distance between the image side surface of the second lens element and the object side surface of the third lens element along the optical axis, a distance between the image side surface of the third lens element and the object side surface of the fourth lens element along the optical axis, a distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element along the optical axis, and a distance between the image side surface of the fifth lens element and the object side surface of the sixth lens element along the optical axis, T5 is a thickness of the fifth lens element along the optical axis, and G56 is a distance between the image side surface of the fifth lens element and the object side surface of the sixth lens element along the optical axis.

10. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

AAG/(T3+G45)≤6.900, wherein AAG is a sum of a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, a distance between the image side surface of the second lens element and the object side surface of the third lens element along the optical axis, a distance between the image side surface of the third lens element and the object side surface of the fourth lens element along the optical axis, a distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element along the optical axis, and a distance between the image side surface of the fifth lens element and the object side surface of the sixth lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, and G45 is a distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element along the optical axis.

11. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

(T1+T2+T3)/(G12+G34)≤4.100, wherein T1 is a thickness of the first lens element along the optical axis, 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, G12 is a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, and G34 is a distance between the image side surface of the third lens element and the object side surface of the fourth lens element along the optical axis.

12. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

(G12+T3+T5+T6)/(T1+G23)≤3.000, wherein G12 is a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, T3 is a thickness of the third lens element along the optical axis, T5 is a thickness of the fifth lens element along the optical axis, T1 is a thickness of the first lens element along the optical axis, and G23 is a distance between the image side surface of the second lens element and the object side surface of the third lens element along the optical axis.

13. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

EFL/(T1+T2)≤4.000, wherein EFL is an effective focal length of the optical imaging lens, T1 is a thickness of the first lens element along the optical axis, and T2 is a thickness of the second lens element along the optical axis.

14. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

EFL/(G12+G45+G56)≤7.200, wherein EFL is an effective focal length of the optical imaging lens, G12 is a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, G45 is a distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element along the optical axis, and G56 is a distance between the image side surface of the fifth lens element and the object side surface of the sixth lens element along the optical axis.

15. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

TTL/(T1+G23)≤9.000, wherein T1 is a thickness of the first lens element along the optical axis, and G23 is a distance between the image side surface of the second lens element and the object side surface of the third lens element along the optical axis.

16. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

(T3+G34+T4)/(T1 T2)≤2.000, wherein T3 is a thickness of the third lens element along the optical axis, G34 is a distance between the image side surface of the third lens element and the object side surface of the fourth lens element along the optical axis, T4 is a thickness of the fourth lens element along the optical axis, T1 is a thickness of the first lens element along the optical axis, and T2 is a thickness of the second lens element along the optical axis.

17. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

BFL/(G12+G23)≤3.400, wherein BFL is a distance between the image side surface of the sixth lens element and an image plane of the optical imaging lens along the optical axis, G12 is a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, and G23 is a distance between the image side surface of the second lens element and the object side surface of the third lens element along the optical axis.

18. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

(T6+BFL)/(G34+G45+G56)≤8.000, wherein BFL is a distance between the image side surface of the sixth lens element and an image plane of the optical imaging lens along the optical axis, G34 is a distance between the image side surface of the third lens element and the object side surface of the fourth lens element along the optical axis, G45 is a distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element along the optical axis, and G56 is a distance between the image side surface of the fifth lens element and the object side surface of the sixth lens element along the optical axis.

19. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

(AAG+BFL)/(T2+T3+T4)≤4.100, wherein AAG is a sum of a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, a distance between the image side surface of the second lens element and the object side surface of the third lens element along the optical axis, a distance between the image side surface of the third lens element and the object side surface of the fourth lens element along the optical axis, a distance between the image side surface of the fourth lens element and the object side surface of the fifth lens element along the optical axis, and a distance between the image side surface of the fifth lens element and the object side surface of the sixth lens element along the optical axis, BFL is a distance between the image side surface of the sixth lens element and an image plane of the optical imaging lens along the optical axis, 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, and T4 is a thickness of the fourth lens element along the optical axis.

20. The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies a condition as follows:

(ALT+BFL)/(G12+G23+G34)≤6.100, wherein ALT is a total of thicknesses of all the lens elements having refracting power of the optical imaging lens along the optical axis, BFL is a distance between the image side surface of the sixth lens element and an image plane of the optical imaging lens along the optical axis, G12 is a distance between the image side surface of the first lens element and the object side surface of the second lens element along the optical axis, G23 is a distance between the image side surface of the second lens element and the object side surface of the third lens element along the optical axis, and G34 is a distance between the image side surface of the third lens element and the object side surface of the fourth lens element along the optical axis.