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 with a convex portion in a vicinity of its periphery;

said second lens element has an image-side surface with a concave portion in a vicinity of said optical axis and a convex portion in a vicinity of its periphery;

said third lens element is made of plastic;

said fourth lens element has an image-side surface with a concave portion in a vicinity of its periphery;

said fifth lens element is made of plastic; and

said sixth lens element is made of plastic and has an object-side surface with a concave portion in a vicinity of said optical axis, and said optical imaging lens set exclusively has 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 with refractive power.

2. The optical imaging lens set of claim 1 , wherein the effective focal length EFL of said optical imaging lens set and a thickness T 1 of said first lens element along said optical axis satisfy a relationship EFL/T 1 ≦7.5.

3. The optical imaging lens set of claim 2 , wherein an air gap G 34 between said third lens element and said fourth lens element along said optical axis and a thickness T 6 of said sixth lens element along said optical axis satisfy a relationship T 6 /G 34 ≦4.

4. The optical imaging lens set of claim 2 , wherein a total thickness ALT 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 ALT/G 34 ≦19.

5. The optical imaging lens set of claim 2 , wherein a distance BFL between said image-side surface of said sixth lens element to an image plane and a thickness T 2 of said second lens element along said optical axis satisfy a relationship BFL/T 2 ≦5.77.

6. The optical imaging lens set of claim 1 , wherein a thickness T 2 of said second lens element along said optical axis and a thickness T 6 of said sixth lens element along said optical axis satisfy a relationship 0.45≦T 2 /T 6 .

7. The optical imaging lens set of claim 6 , wherein a thickness T 1 of said first lens element along said optical axis, and a thickness T 5 of said fifth lens element along said optical axis satisfy a relationship T 5 /T 1 ≦1.4.

8. The optical imaging lens set of claim 1 , wherein the effective focal length EFL of said optical imaging lens set and a thickness T 2 of said second lens element along said optical axis satisfy a relationship EFL/T 2 ≦16.

9. The optical imaging lens set of claim 8 , wherein a thickness T 1 of said first lens element along said optical axis, and a thickness T 3 of said third lens element along said optical axis satisfy a relationship 1≦T 1 /T 3 .

10. The optical imaging lens set of claim 1 , wherein a total thickness ALT 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 a thickness T 1 of said first lens element along said optical axis satisfy a relationship ALT/T 1 ≦7.

11. The optical imaging lens set of claim 10 , wherein the effective focal length EFL of said optical imaging lens set and an air gap G 34 between said third lens element and said fourth lens element along said optical axis satisfy a relationship EFL/G 34 ≦25.2.

12. The optical imaging lens set of claim 10 , wherein the sum of all five air gaps AAG between each lens element from said first lens element to said sixth lens element along the optical axis, an air gap G 45 between said fourth lens element and said fifth lens element along said optical axis and an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis satisfy a relationship 2.41≦AAG/(G 45 +G 56 ).

13. The optical imaging lens set of claim 1 , wherein a thickness T 5 of said fifth lens element along said optical axis and a thickness T 6 of said sixth lens element along said optical axis satisfy a relationship T 5 /T 6 ≦2.08.

14. The optical imaging lens set of claim 13 , wherein the effective focal length EFL of said optical imaging lens set and a thickness T 4 of said fourth lens element along said optical axis satisfy a relationship EFL/T 4 ≦9.38.

15. The optical imaging lens set of claim 1 , wherein a thickness T 4 of said fourth lens element along said optical axis and a thickness T 5 of said fifth lens element along said optical axis satisfy a relationship T 5 /T 4 ≦1.29.

16. The optical imaging lens set of claim 1 , wherein a total thickness ALT 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 a thickness T 4 of said fourth lens element along said optical axis satisfy a relationship ALT/T 4 ≦6.5.

17. 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.