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 to sixth lens elements with refractive power, having an object-side surface facing toward the object side as well as an image-side surface facing toward the image side, wherein:

the first lens element has positive refractive power, and has an image-side surface with a concave part in an outermost portion for an imaging rays passing through;

the second lens element has an object-side surface with a concave part in an outermost portion for the imaging rays passing through, and an image-side surface with a concave part in an outermost portion for the imaging rays passing through;

the fourth lens element has negative refractive power, and has an image-side surface with a convex part in a vicinity of the optical axis, and an image-side surface with a convex part in an outermost portion for the imaging rays passing through;

the fifth lens element has an object-side surface with a convex part in a vicinity of the optical axis, and an image-side surface with a concave part in a vicinity of the optical axis;

the sixth lens element has an image-side surface with a convex part in an outermost portion for the imaging rays passing through, and the sixth lens element being made of plastic; and

the optical imaging lens set does not include any lens element with refractive power other than said first lens element, second lens element, third lens element, fourth lens element, fifth lens element and sixth lens element, in addition, an air gap G 23 between said second lens element and said third lens element along said optical axis, 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, and a thickness T 6 of said sixth lens element along said optical axis satisfy relationships AAG/T 6 ≦2.9 and 1≦T 6 /G 23 ≦3.5.

2. The optical imaging lens set of claim 1 , wherein a thickness T 1 of said first lens element along said optical axis further satisfies a relationship T 1 /T 6 ≦1.4.

3. The optical imaging lens set of claim 2 , wherein a distance BFL between the image-side surface of the 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 a relationship 2≦BFL/G 56 ≦11.0.

4. The optical imaging lens set of claim 3 , wherein the effective focal length EFL of the optical imaging lens set satisfies a relationship 10.5≦EFL/G 23 ≦30.

5. The optical imaging lens set of claim 1 , wherein an air gap G 12 between said first lens element and said second lens element along said optical axis further satisfies a relationship AAG/G 12 ≦9.

6. The optical imaging lens set of claim 5 , wherein a distance BFL between the image-side surface of the sixth lens element to an image plane along the optical axis, and a thickness T 5 of said fifth lens element along said optical axis satisfy a relationship 1.9≦BFL/T 5 ≦4.0.

7. The optical imaging lens set of claim 1 , wherein a thickness T 5 of said fifth lens element along said optical axis further satisfies a relationship T 5 /T 6 ≦1.22.

8. The optical imaging lens set of claim 7 , wherein a thickness T 1 of said first lens element along said optical axis, and an air gap G 12 between said first lens element and said second lens element along said optical axis satisfy a relationship T 1 /G 12 ≦3.

9. The optical imaging lens set of claim 7 , wherein an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis, and an air gap G 12 between said first lens element and said second lens element along said optical axis satisfy a relationship G 56 /G 12 ≦4.

10. The optical imaging lens set of claim 9 , wherein a thickness T 3 of said third lens element along said optical axis, and a thickness T 4 of said fourth lens element along said optical axis satisfy a relationship 1.1≦T 3 /T 4 ≦3.0.

11. 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 further satisfies a relationship ALT/T 6 ≦6.

12. The optical imaging lens set of claim 11 , wherein an air gap G 12 between said first lens element and said second lens element along said optical axis satisfies a relationship G 23 /G 12 ≦5.5.

13. The optical imaging lens set of claim 12 , wherein a thickness T 3 of said third lens element along said optical axis, and a thickness T 5 of said fifth lens element along said optical axis satisfy a relationship 0.85≦T 3 /T 5 ≦2.0.

14. The optical imaging lens set of claim 11 , wherein a distance BFL between the image-side surface of the sixth lens element to an image plane along the optical axis satisfies a relationship 2.6≦BFL/G 23 ≦10.

15. The optical imaging lens set of claim 1 , wherein an air gap G 12 between said first lens element and said second lens element along said optical axis further satisfies a relationship AAG/G 12 ≦7.

16. The optical imaging lens set of claim 15 , wherein the effective focal length EFL of the optical imaging lens set, and a thickness T 5 of said fifth lens element along said optical axis satisfy a relationship 1.9≦EFL/T 5 ≦14.0.

17. 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 an air gap G 12 between said first lens element and said second lens element along said optical axis satisfy a relationship ALT/G 12 ≦13.6.

18. 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 an installation of said optical imaging lens set;

a module housing unit for an installation of said barrel;

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

an image sensor disposed on the substrate and disposed at an image side of said optical imaging lens set.