OPTICAL IMAGING LENS AND ELETRONIC 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, an aperture stop, a second lens element, a third lens element and a fourth lens element, all of the first lens element, the second lens element, the third lens element and the fourth lens element having refractive power, said first to fourth lens elements 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 having an object-side surface with a convex part in a vicinity of the optical axis, and with a convex part in a vicinity of its periphery;

the second lens element with negative refractive power;

the third lens element with positive refractive power, having an object-side surface with a concave part in a vicinity of its periphery, and having an image-side surface with a convex part in a vicinity of the optical axis;

the fourth lens element having an object-side surface with a convex part in a vicinity of its periphery, and having an image-side surface with a concave part in a vicinity of the optical axis, and a convex part in a vicinity of its periphery; and

the optical imaging lens set not including any lens element with refractive power other than said first lens element, second lens element, third lens element and fourth lens element.

2 . The optical imaging lens set of claim 1 , wherein a distance BFL between the image-side surface of the fourth lens element to an image plane along the optical axis, and the sum of all three air gaps AAG between each lens element from said first lens element to said fourth lens element along the optical axis satisfy a relationship BFL/AAG≦2.0.

3 . The optical imaging lens set of claim 2 , wherein an air gap AG 12 between said first lens element and said second lens element along said optical axis, an air gap AG 34 between said third lens element and said fourth lens element along said optical axis, and a thickness T 2 of said second lens element along said optical axis satisfy a relationship (AG 12 +AG 34 )/T 2 ≦1.

4 . The optical imaging lens set of claim 3 , wherein a thickness T 4 of said fourth lens element along said optical axis satisfies a relationship 1.6≦T 4 /T 2 .

5 . The optical imaging lens set of claim 3 , wherein a thickness T 1 of said first lens element along said optical axis satisfies a relationship 1.3≦AAG/T 1 .

6 . The optical imaging lens set of claim 2 , 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 T 3 /T 4 ≦1.2.

7 . The optical imaging lens set of claim 1 , wherein a thickness T 3 of said third lens element along said optical axis, and the sum of all three air gaps AAG between each lens element from said first lens element to said fourth lens element along the optical axis satisfy a relationship T 3 /AAG≦0.95.

8 . The optical imaging lens set of claim 7 , wherein an air gap AG 12 between said first lens element and said second lens element along said optical axis, an air gap AG 34 between said third lens element and said fourth lens element along said optical axis, and a thickness T 2 of said second lens element along said optical axis satisfy a relationship (AG 12 +AG 34 )/T 2 ≦1.

9 . The optical imaging lens set of claim 8 , wherein a thickness T 4 of said fourth lens element along said optical axis satisfies a relationship AAG/T 4 ≦1.7.

10 . The optical imaging lens set of claim 8 , wherein a total thickness ALT of said first lens element, said second lens element, said third lens element and said fourth lens element along said optical axis, and a thickness T 1 of said first lens element along said optical axis satisfy a relationship 3.45≦ALT/T 1 .

11 . The optical imaging lens set of claim 1 , wherein an air gap AG 12 between said first lens element and said second lens element along said optical axis, an air gap AG34 between said third lens element and said fourth lens element along said optical axis, and a thickness T 2 of said second lens element along said optical axis satisfy a relationship (AG 12 +AG 34 )/T 2 ≦1.

12 . The optical imaging lens set of claim 11 , wherein a total thickness ALT of said first lens element, said second lens element, said third lens element and said fourth 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 ≦3.8.

13 . The optical imaging lens set of claim 12 , wherein the sum of all three air gaps AAG between each lens element from said first lens element to said fourth lens element along the optical axis satisfies a relationship 2.7≦AAG/T 2 .

14 . The optical imaging lens set of claim 1 , 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 T 3 /T 4 ≦1.2.

15 . The optical imaging lens set of claim 14 , wherein a total thickness ALT of said first lens element, said second lens element, said third lens element and said fourth lens element along said optical axis, an air gap AG 12 between said first lens element and said second lens element along said optical axis, an air gap AG 34 between said third lens element and said fourth lens element along said optical axis satisfy a relationship 7.0≦ALT/(AG 12 +AG 34 ).

16 . The optical imaging lens set of claim 15 , wherein the sum of all three air gaps AAG between each lens element from said first lens element to said fourth lens element along the optical axis satisfies a relationship 3.0≦AAG/(AG 12 +AG 34 ).

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;

a substrate for the 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.