Optical imaging lens

Abstract

Present embodiments relate to an optical imaging lens. The optical imaging lens may include a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element positioned sequentially from an object side to an image side. Through arrangement of convex or concave surfaces of the five lens elements, the length of the optical imaging lens may be shortened while providing improved optical characteristics and imaging quality.

What is claimed is: 
     
         1 . An optical imaging lens, comprising first, second, third, fourth, and fifth lens elements as five frontmost lens elements having refracting power arranged sequentially in ascending order from an object side to an image side along an optical axis, each of the first, second, third, fourth, and fifth lens elements having refracting power, an object-side surface facing toward the object side, an image-side surface facing toward the image side, wherein:
 a F-number of the optical imaging lens is represented by Fno;   an image height of the optical imaging lens is represented by ImgH;   an effective focal length of the optical imaging lens is represented by EFL;   a sum of the all air gaps from the first lens element to the fifth lens element along the optical axis is represented by AAG;   an air gap between the second lens element and the third lens element along the optical axis is represented by G23; and   the optical imaging lens further satisfies inequalities: Fno*ImgH/EFL≤0.716 and AAG/G23≤4.   
     
     
         2 . The optical imaging lens according to  claim 1 , wherein a central thickness of the first lens element along the optical axis is represented by T1, a central thickness of the fifth lens element along the optical axis is represented by T5, and the optical imaging lens further satisfies an inequality: (AAG+T5)/T13≤3.01. 
     
     
         3 . The optical imaging lens according to  claim 1 , 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: EFL/BFL≤4.2. 
     
     
         4 . The optical imaging lens according to  claim 1 , wherein a central thickness of the fourth lens element along the optical axis is represented by T4, and the optical imaging lens further satisfies an inequality: AAG/T4≤7.2. 
     
     
         5 . The optical imaging lens according to  claim 1 , wherein a central thickness of the first lens element along the optical axis is represented by T1, a distance from the object-side surface of the first lens element to an image plane along the optical axis is represented by TTL, and the optical imaging lens further satisfies an inequality: 1.885≤(TTL*ImgH)/(EFL*T1)≤2.423. 
     
     
         6 . The optical imaging lens according to  claim 1 , wherein a distance from the object-side surface of the first lens element to an image plane along the optical axis is represented by TTL, a distance from the image-side surface of the fifth lens element to the image plane along the optical axis is represented by BFL, and the optical imaging lens further satisfies an inequality: 0.564≤(TTL*ImgH)/(EFL*BFL)≤1.078. 
     
     
         7 . The optical imaging lens according to  claim 1 , wherein the optical imaging lens further satisfies an inequality: EFL≥8 mm. 
     
     
         8 . An optical imaging lens, comprising first, second, third, fourth, and fifth lens elements as five frontmost lens elements having refracting power arranged sequentially in ascending order from an object side to an image side along an optical axis, each of the first, second, third, fourth, and fifth lens elements having refracting power, an object-side surface facing toward the object side, an image-side surface facing toward the image side, wherein:
 the image-side surface of the fifth lens element comprises a convex portion in a vicinity of a periphery of the fifth lens element;   a F-number of the optical imaging lens is represented by Fno;   an image height of the optical imaging lens is represented by ImgH;   an effective focal length of the optical imaging lens is represented by EFL;   a sum of the all air gaps from the first lens element to the fifth lens element along the optical axis is represented by AAG;   an air gap between the second lens element and the third lens element along the optical axis is represented by G23;   a distance from the object-side surface of the first lens element to an image plane along the optical axis is represented by TTL;   a distance from the image-side surface of the fifth lens element to the image plane along the optical axis is represented by BFL;   a central thickness of the second lens element along the optical axis is represented by T2;   a central thickness of the fifth lens element along the optical axis is represented by T5; and   the optical imaging lens further satisfies inequalities: Fno*ImgH/EFL≤0.716, TTL/BFL≤3.61, and (AAG+T5)/(T2+G23)≤4.2.   
     
     
         9 . The optical imaging lens according to  claim 8 , wherein a sum of central thicknesses from the first to the fifth lens elements along the optical axis is represented by ALT, and the optical imaging lens further satisfies an inequality: TTL/ALT≤2.21. 
     
     
         10 . The optical imaging lens according to  claim 8 , wherein the optical imaging lens further satisfies an inequality: AAG/G23≤4. 
     
     
         11 . The optical imaging lens according to  claim 8 , wherein a central thickness of the fourth lens element along the optical axis is represented by T4, and the optical imaging lens further satisfies an inequality: (AAG+T2)/T4≤8.51. 
     
     
         12 . The optical imaging lens according to  claim 8 , wherein a central thickness of the first lens element along the optical axis is represented by T1, an air gap between the first lens element and the second lens element along the optical axis is represented by G12, an air gap between the fourth lens element and the fifth lens element along the optical axis is represented by G45, and the optical imaging lens further satisfies an inequality: (G12+T2+G45+T5)/T1≤2.2. 
     
     
         13 . The optical imaging lens according to  claim 8 , wherein a central thickness of the third lens element along the optical axis is represented by T3, an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, an air gap between the fourth lens element and the fifth lens element along the optical axis is represented by G45, and the optical imaging lens further satisfies an inequality: (T2+G23+G34+G45+T5)/T3≤6. 
     
     
         14 . The optical imaging lens according to  claim 8 , wherein a central thickness of the first lens element along the optical axis is represented by T1, an air gap between the third lens element and the fourth lens element along the optical axis is represented by G34, an air gap between the fourth lens element and the fifth lens element along the optical axis is represented by G45, and the optical imaging lens further satisfies an inequality: (T2+G23+G34+G45+T5)/T1≤3.3. 
     
     
         15 . An optical imaging lens, comprising first, second, third, fourth, and fifth lens elements as five frontmost lens elements having refracting power arranged sequentially in ascending order from an object side to an image side along an optical axis, each of the first, second, third, fourth, and fifth lens elements having refracting power, an object-side surface facing toward the object side, an image-side surface facing toward the image side, wherein:
 the image-side surface of the fifth lens element comprises a convex portion in a vicinity of a periphery of the fifth lens element;   a F-number of the optical imaging lens is represented by Fno;   an image height of the optical imaging lens is represented by ImgH; an effective focal length of the optical imaging lens is represented by EFL;   a distance from the object-side surface of the first lens element to an image plane along the optical axis is represented by TTL;   a distance from the image-side surface of the fifth lens element to the image plane along the optical axis is represented by BFL;   a central thickness of the first lens element along the optical axis is represented by T1;   a central thickness of the second lens element along the optical axis is represented by T2;   a central thickness of the fifth lens element along the optical axis is represented by T5;   an air gap between the first lens element and the second lens element along the optical axis is represented by G12;   an air gap between the fourth lens element and the fifth lens element along the optical axis is represented by G45; and   the optical imaging lens further satisfies inequalities: Fno*ImgH/EFL≤0.716, TTL/BFL≤3.61, and (G12+T2+G45+T5)/T1≤2.2.   
     
     
         16 . The optical imaging lens according to  claim 15 , wherein a sum of the all air gaps from the first to the fifth lens elements along the optical axis is represented by AAG, an air gap between the second lens element and the third lens element along the optical axis is represented by G23, and the optical imaging lens further satisfies an inequality: (AAG+T5)/(T2+G23)≤4.2. 
     
     
         17 . The optical imaging lens according to  claim 15 , wherein a sum of the all air gaps from the first to the fifth lens elements along the optical axis is represented by AAG, and the optical imaging lens further satisfies an inequality: (AAG+T2)/T5≤4.6. 
     
     
         18 . The optical imaging lens according to  claim 15 , wherein a sum of central thicknesses from the first to the fifth lens elements along the optical axis is represented by ALT, and the optical imaging lens further satisfies an inequality: EFL/ALT≤2.4. 
     
     
         19 . The optical imaging lens according to  claim 15 , wherein a central thickness of the third lens element along the optical axis is represented by T3, and the optical imaging lens further satisfies an inequality: (G12+T2+G45+T5)/T3≤4.1. 
     
     
         20 . The optical imaging lens according to  claim 15 , wherein an abbe number of the fifth lens element is represented by v5, and the optical imaging lens further satisfies an inequality: v5≤35.