Optical imaging lens and electronic device comprising the same

1. An optical imaging lens set, from an object side toward an image side in order along an optical axis 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, said first lens element to said sixth lens element each having an object-side surface facing toward the object side as well as an image-side surface facing toward the image side, wherein:

said first lens element has an image-side surface of a concave part in a vicinity of the optical axis;

said second lens element has an object-side surface of a concave part in a periphery region, and an image-side surface of a concave part in a vicinity of the optical axis and of a concave part in a periphery region;

said third lens element has an object-side surface of a concave part in a periphery region;

said fourth lens element of positive refractive power has an object-side surface of a concave part of the optical axis, and

the optical imaging lens set exclusively has six lens elements with refractive power, said third lens element has a third lens element thickness T 3 , there is an air gap G 34 between said third lens element and said fourth lens element and there is an air gap G 45 between said fourth lens element and said fifth lens element to satisfy (T 3 +G 45 )/G 34 ≦1.20.

2. The optical imaging lens set of claim 1 , wherein an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis satisfies 0.70≦(T 3 /G 56 )≦5.40.

3. The optical imaging lens set of claim 1 , wherein an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis satisfies 1.00≦(G 34 /G 56 )≦5.50.

4. The optical imaging lens set of claim 1 , wherein an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis satisfies 0.90≦G 34 /(G 45 +G 56 )≦3.80.

5. The optical imaging lens set of claim 1 , wherein ALT is the total thickness of all six lens elements and said third lens element has a third lens element thickness T 3 to satisfy 5.50≦ALT/T 3 .

6. The optical imaging lens set of claim 5 , wherein the sum of all air gaps AAG between each lens elements from said first lens element to said sixth lens element along the optical axis satisfies 1.80≦ALT/AAG.

7. The optical imaging lens set of claim 1 , wherein TTL is a distance from the first object-side surface to an image plane to satisfy 10.20≦TTL/T 3 .

8. The optical imaging lens set of claim 7 , wherein a second lens element thickness T 2 of said second lens element and an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis satisfy 0.50≦T 2 /(G 45 +G 56 )≦1.80.

9. The optical imaging lens set of claim 1 , wherein a distance TTL from the first object-side surface to an image plane and an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis satisfy 10.00≦(TTL/G 56 )≦50.10.

10. The optical imaging lens set of claim 1 , wherein a distance BFL between said image-side surface of said sixth lens element to an image plane along the optical axis and an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis satisfy 2.00≦(BFL/G 56 )≦12.30.

11. The optical imaging lens set of claim 1 , wherein ALT is the total thickness of all six lens elements and there is an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis to satisfy 5.00≦(ALT/G 56 )≦26.80.

12. The optical imaging lens set of claim 1 , wherein the sum of all air gaps AAG between each lens elements from said first lens element to said sixth lens element along the optical axis and an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis satisfy 3.00≦(AAG/G 56 )≦11.10.

13. The optical imaging lens set of claim 1 , wherein a second lens element thickness T 2 of said second lens element and an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis satisfy 0.50≦(T 2 /G 56 )≦2.60.

14. The optical imaging lens set of claim 1 , wherein an air gap G 23 between said second lens element and said third lens element along said optical axis satisfy T 3 /G 23 ≦2.60.

15. The optical imaging lens set of claim 14 , wherein said fifth lens element has a fifth lens element thickness T 5 to satisfy G 34 /T 5 ≦1.40.

16. The optical imaging lens set of claim 1 , wherein a second lens element thickness T 2 of said second lens element satisfies T 3 /T 2 ≦1.90.

17. The optical imaging lens set of claim 16 , wherein the sum of all air gaps AAG between each lens elements from said first lens element to said sixth lens element along the optical axis and a fourth lens element thickness T 4 of said fourth lens element satisfy AAG/T 4 ≦2.70.

18. The optical imaging lens set of claim 1 , wherein a distance BFL between said image-side surface of said sixth lens element to an image plane along the optical axis satisfies 2.50≦BFL/T 3 .

19. The optical imaging lens set of claim 18 , wherein ALT is the total thickness of all six lens elements satisfies 5.60≦(G 45 +ALT)/G 34 .

20. An electronic device, comprising:

a case; and

an image module disposed in said case and comprising:

an optical imaging lens set of claim 1 ;

a barrel for the installation of said optical imaging lens set;

a module housing unit for the installation of said barrel; and

an image sensor disposed at an image side of said optical imaging lens set.