Optical imaging lens and electronic device comprising the same
An optical imaging lens includes: a first, second, third and fourth lens element, the first lens element has negative refractive power, the second lens element has an image-side surface with a concave part in a vicinity of the optical axis, the third lens element has positive refractive power, and has an object-side surface with a convex part in a vicinity of the optical axis, the fourth lens element has an image-side surface with a concave part in a vicinity of the optical axis, where the optical imaging lens set does not include any lens element with refractive power other than said first, second, third and fourth lens elements.
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 and a fourth lens element, 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:
said first lens element has negative refractive power;
said second lens element has an image-side surface with a concave part in a vicinity of the optical axis;
said third lens element has positive refractive power, and has an object-side surface with a convex part in a vicinity of the optical axis;
said fourth lens element has an image-side surface with a concave part in a vicinity of the optical axis; and
wherein the optical imaging lens set does not include any lens element with refractive power other than said first, second, third and fourth lens elements, in addition, a thickness T 1 of said first lens element along said optical axis, and a distance TTL between said object-side surface of said first lens element to an image plane satisfy a relationship TTL/T 1 ≦17.06.
2. The optical imaging lens set of claim 1 , wherein an effective focal length EFL of the optical imaging lens set, and a distance BFL between the image-side surface of said fourth lens element to an image plane satisfy a relationship EFL/BFL≦2.35.
3. The optical imaging lens set of claim 2 , wherein a 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 TTL/AAG≦13.94.
4. The optical imaging lens set of claim 1 , further comprising an aperture stop disposed between said second lens element and said third lens element.
5. The optical imaging lens set of claim 4 , wherein an air gap G 12 between said first lens element and said second lens element along said optical axis satisfies a relationship TTL/G 12 ≦89.82.
6. The optical imaging lens set of claim 1 , wherein a thickness T 2 of said second lens element along said optical axis satisfies a relationship TTL/T 2 ≦32.35.
7. The optical imaging lens set of claim 6 , 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 an air gap G 23 between said second lens element and said third lens element along said optical axis satisfy a relationship ALT/G 23 ≦47.81.
8. 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 satisfies a relationship TTL/G 23 ≦71.93.
9. 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 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 ≦40.80.
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 TTL/G 34 ≦61.66.
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 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 ALT/T 2 ≦20.82.
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 TTL/T 3 ≦12.87.
13. The optical imaging lens set of claim 1 , wherein a thickness T 4 of said fourth lens element along said optical axis satisfies a relationship TTL/T 4 ≦21.49.
14. The optical imaging lens set of claim 1 , wherein a distance BFL between the image-side surface of said fourth lens element to an image plane satisfies a relationship TTL/BFL≦5.77.
15. The optical imaging lens set of claim 14 , wherein an Abbe number ν 2 of said second lens element, and an Abbe number ν 3 of said third lens element satisfy a relationship |ν 2 −ν 3 |≦10.
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 and said fourth lens element along said optical axis, and a 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 ALT/AAG≦9.22.
17. The optical imaging lens set of claim 16 , 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 ≦4.34.
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.