Mobile device and optical imaging lens thereof

Abstract

An optical imaging lens includes six lens elements positioned sequentially from an object side to an image side along an optical axis. The image-side surface of the first lens element has a concave portion in a vicinity of the periphery of the first lens element and the object-side surface of the sixth lens element has a convex portion in a vicinity of the periphery of the sixth lens element. Gaa is a sum of all five air gaps from the first lens element to the sixth lens element along the optical axis, T5 is a central thickness of the fifth lens element along the optical axis, and Gaa and T5 satisfy the equation Gaa/T5≤3.85.

What is claimed is: 
     
         1 . An optical imaging lens, comprising sequentially from an object side to an image side along an optical axis, first, second, third, fourth, fifth, and sixth lens elements, each of the lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein:
 the image-side surface of the first lens element comprises a concave portion in a vicinity of a periphery of the first lens element; and   the object-side surface of the sixth lens element comprises a convex portion in a vicinity of a periphery of the sixth lens element;   wherein Gaa is a sum of all five air gaps from the first lens element to the sixth lens element along the optical axis, T5 is a central thickness of the fifth lens element along the optical axis, and Gaa and T5 satisfy the equation:
     Gaa/T 5≤3.85.
 
   
     
     
         2 . The optical imaging lens of  claim 1 , wherein ALT is a sum of thicknesses of all six lens elements along the optical axis, G23 is an air gap between the second lens element and the third lens element along the optical axis, and ALT and G23 satisfy the equation:
     ALT/G 23≤55.00.
   
     
     
         3 . The optical imaging lens of  claim 1 , wherein Fno is an f-number of the optical imaging lens, T1 is a central thickness of the first lens element along the optical axis, Fno and T1 satisfy the equation:
     Fno/T 1≤5.80.
   
     
     
         4 . The optical imaging lens of  claim 1 , wherein Fno is an f-number of the optical imaging lens, G56 is an air gap between the fifth lens element and the sixth lens element along the optical axis, G12 is an air gap between the first lens element and the second lens element along the optical axis, and Fno, G56 and G12 satisfy the equations:
   4.621≤ Fno /( G 12+ G 56)≤10.415.
   
     
     
         5 . The optical imaging lens of  claim 1 , wherein T1 is a central thickness of the first lens element along the optical axis, T3 is a central thickness of the third lens element along the optical axis, T6 is a central thickness of the sixth lens element along the optical axis, G12 is an air gap between the first lens element and the second lens element along the optical axis, G23 is an air gap between the second lens element and the third lens element along the optical axis and T3, T6, G12, T1 and G23 satisfy the equation:
   1.540≤( T 3+ T 6+ G 12)/( T 1+ G 23)≤1.967.
   
     
     
         6 . The optical imaging lens of  claim 1 , wherein Fno is an f-number of the optical imaging lens, T4 is a central thickness of the fourth lens element along the optical axis, Fno and T4 satisfy the equation:
     Fno/T 4≤5.900.
   
     
     
         7 . The optical imaging lens of  claim 1 , wherein T2 is a central thickness of the second lens element along the optical axis, T3 is a central thickness of the third lens element along the optical axis, T6 is a central thickness of the sixth lens element along the optical axis, G34 is an air gap between the third lens element and the fourth lens element along the optical axis, G23 is an air gap between the second lens element and the third lens element along the optical axis, and T3, T6, G34, T2 and G23 satisfy the equation:
   1.558≤( T 3+ T 6+ G 34)/( T 2+ G 23)≤1.766.
   
     
     
         8 . An optical imaging lens, comprising sequentially from an object side to an image side along an optical axis, first, second, third, fourth, fifth, and sixth lens elements, each of the lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein:
 the object-side surface of the second lens element comprises a convex portion in a vicinity of the optical axis of the second lens element;   the fifth lens element has positive refractive power; and   the object-side surface of the sixth lens element comprises a convex portion in a vicinity of a periphery of the sixth lens element;   wherein f is an effective focal length of the optical imaging lens, T4 is a central thickness of the fourth lens element along the optical axis, G56 is an air gap between the fifth lens element and the sixth lens element along the optical axis, and f, T4 and G56 satisfy the equations:
   4.484≤ f /( T 4+ G 56)≤5.615.
 
   
     
     
         9 . The optical imaging lens of  claim 8 , wherein Fno is an f-number of the optical imaging lens, T2 is a central thickness of the second lens element along the optical axis, Fno and T2 satisfy the equation:
   2.839≤ Fno/T 2≤3.069.
   
     
     
         10 . The optical imaging lens of  claim 8 , Gaa is a sum of all five air gaps from the first lens element to the sixth lens element along the optical axis, G45 is an air gap between the fourth lens element and the fifth lens element along the optical axis, Gaa and G45 satisfy the equation:
     Gaa/G 45≤21.0.
   
     
     
         11 . The optical imaging lens of  claim 8 , Gaa is a sum of all five air gaps from the first lens element to the sixth lens element along the optical axis, T3 is a central thickness of the third lens element along the optical axis, Gaa and T3 satisfy the equation:
     Gaa/T 3≤6.5.
   
     
     
         12 . The optical imaging lens of  claim 8 , ALT is a sum of thicknesses of all six lens elements along the optical axis, T6 is a central thickness of the sixth lens element along the optical axis, ALT and T6 satisfy the equation:
     ALT/T 68.5.   
     
     
         13 . The optical imaging lens of  claim 8 , TTL is a sum of the system length of the optical imaging lens, T1 is a central thickness of the first lens element along the optical axis, TTL and T1 satisfy the equation:
     TTL/T 11≤1.5.
   
     
     
         14 . The optical imaging lens of  claim 8 , ALT is a sum of thicknesses of all six lens elements along the optical axis, G56 is an air gap between the fifth lens element and the sixth lens element along the optical axis, ALT and G56 satisfy the equation:
     ALT/G 56≤30.0.
   
     
     
         15 . An optical imaging lens, comprising sequentially from an object side to an image side along an optical axis, first, second, third, fourth, fifth, and sixth lens elements, each of the lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein:
 the image-side surface of the first lens element comprises a concave portion in a vicinity of a periphery of the first lens element;   the image-side surface of the second lens element comprises a convex portion in a vicinity of the optical axis of the second lens element; and   the object-side surface of the sixth lens element comprises a convex portion in a vicinity of a periphery of the sixth lens element.   
     
     
         16 . The optical imaging lens of  claim 15 , Gaa is a sum of all five air gaps from the first lens element to the sixth lens element along the optical axis, T2 is a central thickness of the second lens element along the optical axis, Gaa and T2 satisfy the equation:
     Gaa/T 2≤5.5.
   
     
     
         17 . The optical imaging lens of  claim 15 , Gaa is a sum of all five air gaps from the first lens element to the sixth lens element along the optical axis, T1 is a central thickness of the first lens element along the optical axis, Gaa and T1 satisfy the equation:
     Gaa/T 1≤3.8.
   
     
     
         18 . The optical imaging lens of  claim 15 , T2 is a central thickness of the second lens element along the optical axis, T5 is a central thickness of the fifth lens element along the optical axis, T2 is greater than T5. 
     
     
         19 . The optical imaging lens of  claim 15 , wherein Fno is an f-number of the optical imaging lens, T4 is a central thickness of the fourth lens element along the optical axis, Fno and T4 satisfy the equation:
     Fno/T 4≤5.900.
   
     
     
         20 . The optical imaging lens of  claim 15 , wherein T1 is a central thickness of the first lens element along the optical axis, T5 is a central thickness of the fifth lens element along the optical axis, T6 is a central thickness of the sixth lens element along the optical axis, T1, T5 and T6 satisfy the equation:
   2.191≤( T 5+ T 6)/ T 1≤2.626.