OPTICAL IMAGING LENS
An optical imaging lens including an aperture stop, 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 arranged in sequence from an object side to an image side along an optical axis is provided. Each lens element includes an object-side surface and an image-side surface. The material of the first lens element is plastic. The object-side surface of the second lens element has a concave portion in a vicinity of the optical axis. The image-side surface of the second lens element has a concave portion in a vicinity of a periphery of the second lens element. The object-side surface of the third lens element has a concave portion in a vicinity of a periphery of the third lens element. The image-side surface of the third lens element has a concave portion in a vicinity of the optical axis. The fourth lens element has positive refractive power. The image-side surface of the fifth lens element has a convex portion in a vicinity of the optical axis. The material of the sixth lens element is plastic.
1 . An optical imaging lens, comprising an aperture stop, 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 arranged in sequence from an object side to an image side along an optical axis, wherein each of the first to sixth lens elements comprises an object-side surface facing toward the object side and allowing an imaging ray to pass through and an image-side surface facing toward the image side and allowing the imaging ray to pass through,
a material of the first lens element comprises a plastic material,
the object-side surface of the second lens element has a concave portion in a vicinity of the optical axis, and the image-side surface of the second lens element has a concave portion in a vicinity of a periphery of the second lens element, p 1 the object-side surface of the third lens element has a concave portion in a vicinity of a periphery of the third lens element, and the image-side surface of the third lens element has a concave portion in a vicinity of the optical axis,
the fourth lens element has a positive refracting power,
the image-side surface of the fifth lens element has a convex portion in a vicinity of the optical axis,
a material of the sixth lens element comprises a plastic material, and
the optical imaging lens only has the six lens elements having a refracting power and satisfies |V2−V3|≦20 and AAG/(G34+G56)≦2.8,
wherein V2 represents an Abbe number of the second lens element, V3 represents an Abbe number of the third lens element, AAG represents a total of five air gaps on the optical axis from the first lens element to the sixth lens element, G34 represents an air gap from the third lens element to the fourth lens element on the optical axis, and G56 represents an air gap from the fifth lens element to the sixth lens element on the optical axis.
2 . The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies T1/T3≧2.4, wherein T1 represents a thickness of the first lens element on the optical axis, and T3 represents a thickness of the third lens element on the optical axis.
3 . The optical imaging lens as claimed in claim 2 , wherein the optical imaging lens further satisfies EFL/(G23+G34)≧6.0, wherein EFL represents an effective focal length of the optical imaging lens, and G23 represents an air gap from the second lens element to the third lens element on the optical axis.
4 . The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies AAG/T2≧4.5, wherein T2 represents a thickness of the second lens element on the optical axis.
5 . The optical imaging lens as claimed in claim 4 , wherein the optical imaging lens further satisfies ALT/(G56+T6)≦3.5, wherein ALT represents a total of thicknesses of the first lens element to the sixth lens element on the optical axis, and T6 represents the thickness of the sixth lens element on the optical axis.
6 . The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies T1/T2≧2.7, wherein T1 represents a thickness of the first lens element on the optical axis, and T2 represents a thickness of the second lens element on the optical axis.
7 . The optical imaging lens as claimed in claim 6 , wherein the optical imaging lens further satisfies AAG/(G12+G34)≧3.5, wherein G12 represents an air gap from the first lens element to the second lens element on the optical axis.
8 . The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies AAG/(T2+T3)≧2.5, wherein T2 represents a thickness of the second lens element on the optical axis, and T3 represents a thickness of the third lens element on the optical axis.
9 . The optical imaging lens as claimed in claim 8 , wherein the optical imaging lens further satisfies ALT/T5≧4.2, wherein ALT represents a total of thicknesses of the first lens element to the sixth lens element on the optical axis, and T5 represents the thickness of the fifth lens element on the optical axis.
10 . The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies ALT/(G34+G45)≦6.2, wherein ALT represents a total of thicknesses of the first lens element to the sixth lens element on the optical axis, and G45 represents an air gap from the fourth lens element to the fifth lens element on the optical axis.
11 . The optical imaging lens as claimed in claim 10 , wherein the optical imaging lens further satisfies EFL/(T2+T5)≧4.5, wherein EFL represents an effective focal length of the optical imaging lens, T2 represents the thickness of the second lens element on the optical axis, and T5 represents the thickness of the fifth lens element on the optical axis.
12 . The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies AAG/(G12+G23)≧3.6, wherein G12 represents an air gap from the first lens element to the second lens element on the optical axis, and G23 represents an air gap from the second lens element to the third lens element on the optical axis.
13 . The optical imaging lens as claimed in claim 12 , wherein the optical imaging lens further satisfies T5/(G12+G56)≦1.7, wherein T5 represents a thickness of the fifth lens element on the optical axis.
14 . The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies ALT/(G12+G45)≦8.3, wherein ALT represents a total of thicknesses of the first lens element to the sixth lens element on the optical axis, G12 represents an air gap from the first lens element to the second lens element on the optical axis, and G45 represents an air gap from the fourth lens element to the fifth lens element on the optical axis.
15 . The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies (G45+G56)/T4≧1.5, wherein G45 represents an air gap from the fourth lens element to the fifth lens element on the optical axis, and T4 represents the thickness of the fourth lens element on the optical axis.
16 . The optical imaging lens as claimed in claim 1 , wherein the optical imaging lens further satisfies EFL/(G23+G45)≦8.0, wherein EFL represents an effective focal length of the optical imaging lens, G23 represents an air gap from the second lens element to the third lens element on the optical axis, and G45 represents an air gap from the fourth lens element to the fifth lens element on the optical axis.