Optical imaging lens

Abstract

An optical imaging lens may include a first, a second, a third, a fourth and a fifth lens elements positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of some of the five lens elements, the optical imaging lens may provide improved imaging quality and optical characteristics, increased focal length of the optical imaging lens, improved assembly yield and reduced size of the imaging lens.

What is claimed is: 
     
         1 . An optical imaging lens comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element sequentially from an object side to an image side along an optical axis, each of the first, second, third fourth and fifth lens elements having an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through, wherein:
 the first lens element is arranged to be a lens element in a first order from the object side to the image side;   the second lens element is arranged to be a lens element in a second order from the object side to the image side and has negative refracting power;   the third lens element is arranged to be a lens element in a third order from the object side to the image side;   the fourth lens element is arranged to be a lens element in a fourth order from the object side to the image side;   an optical axis region of the image-side surface of the fourth lens element is concave;   the fifth lens element is arranged to be a lens element in a fifth order from the object side to the image side; and   a half field of view of the optical imaging lens is represented by HFOV, a distance from the image-side surface of the fifth lens element to an image plane along the optical axis is represented by BFL, a distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element along the optical axis is represented by TL, a distance from the object-side surface of the first lens element to the image plane along the optical axis is represented by TTL, an effective focal length of the optical imaging lens is represented by EFL, and the optical imaging lens satisfies inequalities: HFOV/BFL≤4.400°/mm, HFOV/TL≤2.500°/mm and TTL/EFL≤0.950.   
     
     
         2 . The optical imaging lens according to  claim 1 , wherein a distance from the image-side surface of the first lens element to the object-side surface of the second lens element along the optical axis is greater than a distance from the image-side surface of the third lens element to the object-side surface of the fourth lens element along the optical axis. 
     
     
         3 . The optical imaging lens according to  claim 1 , wherein a F-number of the optical imaging lens is represented by Fno, and the optical imaging lens further satisfies an inequality: HFOV/Fno≤4.200°. 
     
     
         4 . The optical imaging lens according to  claim 1 , wherein a thickness of the fifth lens element along the optical axis is represented by T5, a distance from the image-side surface of the first lens element to the object-side surface of the second lens element along the optical axis is represented by G12, a distance from the image-side surface of the third lens element to the object-side surface of the fourth lens element along the optical axis is represented by G34, a distance from the image-side surface of the fourth lens element to the object-side surface of the fifth lens element along the optical axis is represented by G45, a thickness of the first lens element along the optical axis is represented by T1, a thickness of the fourth lens element along the optical axis is represented by T4, and the optical imaging lens further satisfies an inequality: (T5+G12+G34+G45)/(T1+T4)≤2.200. 
     
     
         5 . The optical imaging lens according to  claim 1 , wherein a thickness of the second lens element along the optical axis is represented by T2, a thickness of the fourth lens element along the optical axis is represented by T4, a distance from the image-side surface of the first lens element to the object-side surface of the second lens element along the optical axis is represented by G12, a distance from the image-side surface of the third lens element to the object-side surface of the fourth lens element along the optical axis is represented by G34, a thickness of the first lens element along the optical axis is represented by T1, and the optical imaging lens further satisfies an inequality: (T2+T4+G12+G34)/T1≤3.200. 
     
     
         6 . The optical imaging lens according to  claim 1 , wherein a sum of the thicknesses of five lens elements from the first lens element to the fifth lens element along the optical axis is represented by ALT, and the optical imaging lens further satisfies an inequality: HFOV/ALT≤3.300°/mm. 
     
     
         7 . The optical imaging lens according to  claim 1 , wherein a sum of four air gaps from the first lens element to the fifth lens element along the optical axis is represented by AAG, a thickness of the third lens element along the optical axis is represented by T3, and the optical imaging lens further satisfies an inequality: AAG/T3≤3.500. 
     
     
         8 . An optical imaging lens comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element sequentially from an object side to an image side along an optical axis, each of the first, second, third fourth and fifth lens elements having an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through, wherein:
 the first lens element is arranged to be a lens element in a first order from the object side to the image side;   a periphery region of the image-side surface of the first lens element is concave;   the second lens element is arranged to be a lens element in a second order from the object side to the image side;   the third lens element is arranged to be a lens element in a third order from the object side to the image side;   the fourth lens element is arranged to be a lens element in a fourth order from the object side to the image side;   the fifth lens element is arranged to be a lens element in a fifth order from the object side to the image side; and   a half field of view of the optical imaging lens is represented by HFOV, a distance from the image-side surface of the fifth lens element to an image plane along the optical axis is represented by BFL, a F-number of the optical imaging lens is represented by Fno, a sum of four air gaps from the first lens element to the fifth lens element along the optical axis is represented by AAG, a thickness of the third lens element along the optical axis is represented by T3, and the optical imaging lens satisfies inequalities: HFOV/BFL≤4.400°/mm, HFOV/Fno≤4.200° and AAG/T3≤3.500.   
     
     
         9 . The optical imaging lens according to  claim 8 , wherein the thickness of the third lens element along the optical axis is greater than a thickness of the fifth lens element along the optical axis. 
     
     
         10 . The optical imaging lens according to  claim 8 , wherein a distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element along the optical axis is represented by TL, and the optical imaging lens further satisfies an inequality: HFOV/TL≤2.500°/mm. 
     
     
         11 . The optical imaging lens according to  claim 8 , wherein a thickness of the second lens element along the optical axis is represented by T2, a distance from the image-side surface of the second lens element to the object-side surface of the third lens element along the optical axis is represented by G23, a distance from the image-side surface of the third lens element to the object-side surface of the fourth lens element along the optical axis is represented by G34, a thickness of the fourth lens element along the optical axis is represented by T4, a distance from the image-side surface of the fourth lens element to the object-side surface of the fifth lens element along the optical axis is represented by G45, a thickness of the fifth lens element along the optical axis is represented by T5, a thickness of the first lens element along the optical axis is represented by T1, a distance from the image-side surface of the first lens element to the object-side surface of the second lens element along the optical axis is represented by G12, and the optical imaging lens further satisfies an inequality: (T2+G23+T3+G34+T4+G45+T5)/(T1+G12)≤2.200. 
     
     
         12 . The optical imaging lens according to  claim 8 , wherein a distance from the image-side surface of the first lens element to the object-side surface of the second lens element along the optical axis is represented by G12, a distance from the image-side surface of the second lens element to the object-side surface of the third lens element along the optical axis is represented by G23, a thickness of the fifth lens element along the optical axis is represented by T5, a thickness of the second lens element along the optical axis is represented by T2, a distance from the image-side surface of the third lens element to the object-side surface of the fourth lens element along the optical axis is represented by G34, and the optical imaging lens further satisfies an inequality: (G12+G23+T5)/(T2+G34)≤3.700. 
     
     
         13 . The optical imaging lens according to  claim 8 , wherein a distance from the object-side surface of the first lens element to the image plane along the optical axis is represented by TTL, an effective focal length of the optical imaging lens is represented by EFL, and the optical imaging lens further satisfies an inequality: TTL/EFL≤0.950. 
     
     
         14 . The optical imaging lens according to  claim 8 , wherein a thickness of the first lens element along the optical axis is represented by T1, and the optical imaging lens further satisfies an inequality: AAG/T1≤2.100. 
     
     
         15 . An optical imaging lens comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element sequentially from an object side to an image side along an optical axis, each of the first, second, third fourth and fifth lens elements having an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through, wherein:
 the first lens element is arranged to be a lens element in a first order from the object side to the image side;   a periphery region of the image-side surface of the first lens element is concave;   the second lens element is arranged to be a lens element in a second order from the object side to the image side;   an optical axis region of the object-side surface of the second lens element is convex;   the third lens element is arranged to be a lens element in a third order from the object side to the image side;   the fourth lens element is arranged to be a lens element in a fourth order from the object side to the image side;   the fifth lens element is arranged to be a lens element in a fifth order from the object side to the image side;   lens elements of the optical imaging lens are five or six lens elements; and   a half field of view of the optical imaging lens is represented by HFOV, a distance from the object-side surface of the first lens element to the image-side surface of the fifth lens element along the optical axis is represented by TL, a thickness of the second lens element along the optical axis is represented by T2, a distance from the image-side surface of the second lens element to the object-side surface of the third lens element along the optical axis is represented by G23, a thickness of the third lens element along the optical axis is represented by T3, a distance from the image-side surface of the third lens element to the object-side surface of the fourth lens element along the optical axis is represented by G34, a thickness of the fourth lens element along the optical axis is represented by T4, a distance from the image-side surface of the fourth lens element to the object-side surface of the fifth lens element along the optical axis is represented by G45, a thickness of the fifth lens element along the optical axis is represented by T5, a thickness of the first lens element along the optical axis is represented by T1, a distance from the image-side surface of the first lens element to the object-side surface of the second lens element along the optical axis is represented by G12, and the optical imaging lens satisfies inequalities: (T2+G23+T3+G34+T4+G45+T5)/(T1+G12)≤2.200 and HFOV/TL≤2.500°/mm; and   the distance from the image-side surface of the first lens element to the object-side surface of the second lens element along the optical axis is greater than the distance from the image-side surface of the second lens element to the object-side surface of the third lens element along the optical axis.   
     
     
         16 . The optical imaging lens according to  claim 15 , wherein the thickness of the third lens element along the optical axis is greater than the thickness of the second lens element along the optical axis. 
     
     
         17 . The optical imaging lens according to  claim 15 , wherein a distance from the image-side surface of the fifth lens element to an image plane along the optical axis is represented by BFL, and the optical imaging lens further satisfies an inequality: HFOV/BFL≤4.400°/mm. 
     
     
         18 . The optical imaging lens according to  claim 15 , wherein the optical imaging lens further satisfies an inequality: (T5+G12+G23+G34)/(T1+T2)≤1.800. 
     
     
         19 . The optical imaging lens according to  claim 15 , wherein the optical imaging lens further satisfies an inequality: (T2+T4+G12+G34)/T3≤3.600. 
     
     
         20 . The optical imaging lens according to  claim 15 , wherein the optical imaging lens further satisfies an inequality: (G12+G45+T5)/(T4+G34)≤3.200.