OPTICAL LENS SET
An optical lens set includes a first lens element of an object-side surface with a convex portion in a vicinity of an optical axis, a second lens element of an image-side surface with a concave portion in a vicinity of its periphery and a sixth lens element of an image-side surface with a convex portion in a vicinity of its periphery. T 5 min is the minimal distance from the object-side surface of the fifth lens element to the image-side surface of the fifth lens element and the fifth lens element has a fifth lens element thickness T 5 along the optical axis to satisfy T 5 min/T 5 ≦0.6.
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 object-side surface with a convex portion in a vicinity of the optical axis;
said second lens element an image-side surface with a concave portion in a vicinity of its periphery;
said sixth lens element has an image-side surface with a convex portion in a vicinity of its periphery, the optical imaging lens set exclusively has six lens elements with refractive power, T 5 min is the minimal distance from the object-side surface of said fifth lens element to the image-side surface of said fifth lens element and said fifth lens element has a fifth lens element thickness T 5 along the optical axis to satisfy T 5 min/T 5 ≦0.6.
2 . The optical imaging lens set of claim 1 , wherein ALT is the total thickness of all six lens elements, an air gap G 34 between said third lens element and said fourth 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 to satisfy ALT/(G 34 +G 56 )≦17.5.
3 . The optical imaging lens set of claim 1 , wherein EFL is the effective focal length of the optical imaging lens set and the third lens element has a third lens element thickness T 3 along the optical axis to satisfy EFL/T 3 ≦18.5.
4 . The optical imaging lens set of claim 1 , wherein the fourth lens element has a fourth lens element thickness T 4 along the optical axis to satisfy T 5 /T 4 ≦3.5.
5 . The optical imaging lens set of claim 1 , wherein ALT is the total thickness of all six lens elements and the second lens element has a second lens element thickness T 2 along the optical axis to satisfy ALT/T 2 ≦13.5.
6 . The optical imaging lens set of claim 1 , wherein the third lens element has a third lens element thickness T 3 along the optical axis and the sum of all air gaps AAG between each lens elements from said first lens element to said sixth lens element along the optical axis to satisfy AAG/T 3 ≧1.8.
7 . The optical imaging lens set of claim 1 , wherein EFL is the effective focal length of the optical imaging lens set, an air gap G 12 between said first lens element and said second 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 to satisfy EFL/(G 12 +G 23 )≦13.
8 . The optical imaging lens set of claim 1 , wherein the first lens element has a first lens element thickness T 1 along the optical axis and the second lens element has a second lens element thickness T 2 along the optical axis to satisfy T 1 /T 2 ≦3.6.
9 . The optical imaging lens set of claim 1 , wherein the second lens element has a second lens element thickness T 2 along the optical axis, an air gap G 23 between said second lens element and said third lens element along said optical axis and an air gap G 45 between said fourth lens element and said fifth lens element along said optical axis to satisfy (G 23 +G 45 )/T 2 ≦4.
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 and an air gap G 45 between said fourth lens element and said fifth lens element along said optical axis to satisfy T 5 /(G 34 +G 45 )≦3.5.
11 . The optical imaging lens set of claim 1 , wherein ALT is the total thickness of all six lens elements, the second lens element has a second lens element thickness T 2 along the optical axis and the sixth lens element has a sixth lens element thickness T 6 along the optical axis to satisfy ALT/(T 2 +T 6 )≦4.4.
12 . The optical imaging lens set of claim 1 , wherein EFL is the effective focal length of the optical imaging lens set, the third lens element has a third lens element thickness T 3 along the optical axis and the sixth lens element has a sixth lens element thickness T 6 along the optical axis to satisfy EFL/(T 3 +T 6 )≦6.5.
13 . The optical imaging lens set of claim 1 , wherein said fifth lens element has an image-side surface with a convex portion in a vicinity of said optical axis.
14 . The optical imaging lens set of claim 1 , wherein the second lens element has a second lens element thickness T 2 along the optical axis, the third lens element has a third lens element thickness T 3 along the optical axis and the sum of all air gaps AAG between each lens elements from said first lens element to said sixth lens element along the optical axis to satisfy AAG/(T 2 +T 3 )≦3.5.
15 . The optical imaging lens set of claim 1 , wherein the first lens element has a first lens element thickness T 1 along the optical axis and the third lens element has a third lens element thickness T 3 along the optical axis to satisfy T 1 /T 3 ≧1.
16 . 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, an air gap G 56 between said fifth lens element and said sixth lens element along said optical axis and the second lens element has a second lens element thickness T 2 along the optical axis to satisfy (G 23 +G 56 )/T 2 ≦3.6.
17 . The optical imaging lens set of claim 1 , wherein EFL is the effective focal length of the optical imaging lens set, the fourth lens element has a fourth lens element thickness T 4 along the optical axis and the sixth lens element has a sixth lens element thickness T 6 along the optical axis to satisfy EFL/(T 4 +T 6 )≦5.7.
18 . The optical imaging lens set of claim 1 , wherein ALT is the total thickness of all six lens elements, an air gap G 23 between said second lens element and said third 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 to satisfy ALT/(G 23 +G 34 )≦8.
19 . The optical imaging lens set of claim 1 , wherein EFL is the effective focal length of the optical imaging lens set, the first lens element has a first lens element thickness T 1 along the optical axis and the third lens element has a third lens element thickness T 3 along the optical axis to satisfy EFL/(T 1 +T 3 )≦5.
20 . 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 and an air gap G 23 between said second lens element and said third lens element along said optical axis to satisfy T 5 /(G 12 +G 23 )≦1.8.