Optical imaging lens and electronic device comprising the same

1. An optical imaging lens set, 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 from an object side toward an image side in order along an optical axis and each lens element has an object-side surface facing toward said object side and allowing imaging light to pass through as well as an image-side surface facing toward said image side and allowing said imaging light to pass through, wherein:

said first lens element has negative refractive power;

said second lens element has a second object-side surface with a convex portion in a vicinity of a circular periphery of said second lens element;

said third lens element has a third object-side surface with a convex portion in a vicinity of a circular periphery of said third lens element;

said fourth lens element has refractive power;

said fifth lens element has a fifth image-side surface with a convex portion in a vicinity of said optical axis; and

said sixth lens element has a sixth object-side surface with a concave portion in a vicinity of a circular periphery of said sixth lens element, wherein said optical imaging lens set exclusively has six lens elements with refractive power, and a distance L tt from said first object-side surface to an imaging plane on said image side along said optical axis and an air gap G 23 between said second lens element and said third lens element along said optical axis satisfy a relationship L tt /G 23 ≦20.0.

2. The optical imaging lens set of claim 1 , wherein a total thickness T all of said first lens element, said second lens element, said third lens element, said fourth lens element, said fifth lens element and said sixth lens element along said optical axis satisfies a relationship T all /G 23 ≦10.0.

3. The optical imaging lens set of claim 2 , satisfying a relationship L tt /T all ≦3.0.

4. The optical imaging lens set of claim 3 , wherein a thickness T 5 of said fifth lens element along said optical axis satisfies a relationship T all /T 5 ≦11.0.

5. The optical imaging lens set of claim 1 , wherein the sum of all four air gaps G aa between each lens element from said first lens element to said sixth lens element along the optical axis satisfies a relationship G aa /G 23 ≦4.5.

6. The optical imaging lens set of claim 5 , wherein a thickness T 1 of said first lens element along said optical axis satisfies a relationship L tt /T 1 ≦23.0.

7. The optical imaging lens set of claim 1 , wherein a total thickness T all of said first lens element, said second lens element, said third lens element, said fourth lens element, said fifth lens element and said sixth lens element along said optical axis and an air gap G 34 between said third lens element and said fourth lens element along said optical axis satisfy a relationship T all /G 34 ≦23.0.

8. The optical imaging lens set of claim 7 , wherein a thickness T 2 of said second lens element along said optical axis satisfies a relationship T all /T 2 ≦7.5.

9. The optical imaging lens set of claim 8 , wherein a thickness T 1 of said first lens element along said optical axis satisfies a relationship L tt /T 1 ≦23.0.

10. The optical imaging lens set of claim 1 , wherein an air gap G 34 between said third lens element and said fourth lens element along said optical axis satisfies a relationship L tt /G 34 ≦35.0.

11. The optical imaging lens set of claim 10 , wherein a thickness T 2 of said second lens element along said optical axis satisfies a relationship L tt /T 2 ≦17.0.

12. The optical imaging lens set of claim 11 , wherein a thickness T 3 of said third lens element along said optical axis satisfies a relationship L tt /T 3 ≦8.5.

13. The optical imaging lens set of claim 1 , wherein the sum of all five air gaps G aa between each lens element from said first lens element to said sixth lens element along the optical axis satisfies a relationship L tt /G aa ≦5.0.

14. The optical imaging lens set of claim 13 , wherein a thickness T 4 of said fourth lens element along said optical axis satisfies a relationship 8.5≦G aa /T 4 .

15. The optical imaging lens set of claim 14 , wherein a thickness T 5 of said fifth lens element along said optical axis satisfies a relationship L tt /T 5 ≦11.0.

16. 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;

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

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

17. The optical imaging lens set of claim 1 , wherein a thickness T 5 of said fifth lens element along said optical axis satisfies a relationship L tt /T 5 ≦11.0.