US2023296867A1PendingUtilityA1

Wide-Angle Lens Assembly

73
Assignee: SINTAI OPTICAL SHENZHEN CO LTDPriority: Dec 19, 2019Filed: May 26, 2023Published: Sep 21, 2023
Est. expiryDec 19, 2039(~13.4 yrs left)· nominal 20-yr term from priority
Inventors:Yuan-Chen Chen
G02B 13/06G02B 9/62G02B 13/0015G02B 13/0045G02B 9/60G02B 13/04G02B 13/18
73
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Claims

Abstract

A wide-angle lens assembly includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, all of which are arranged in order from an object side to an image side along an optical axis. The first lens is a meniscus lens with negative refractive power. The second lens is a meniscus lens with positive refractive power and includes a concave surface facing the object side and a convex surface facing the image side. The third lens is with positive refractive power and includes a convex surface facing the object side. The fourth lens is with positive refractive power. The fifth lens is with negative refractive power. The wide-angle lens assembly satisfies: −3<f 2 /f 1 <−1; wherein f 1 is an effective focal length of the first lens and f 2 is an effective focal length of the second lens.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A wide-angle lens assembly, comprising sequentially from an object side to an image side along an optical axis:
 a first lens which is a meniscus lens with negative refractive power;   a second lens which is a meniscus lens with positive refractive power,
 comprising a concave surface facing the object side and a convex surface facing the image side; 
   a third lens with positive refractive power, comprising a convex surface facing the object side;   a fourth lens with positive refractive power; and   a fifth lens with negative refractive power;   wherein the wide-angle lens assembly satisfies:
   −< f   2   /f   1 <−1;
 
   wherein f 1  is an effective focal length of the first lens and f 2  is an effective focal length of the second lens.   
     
     
         2 . The wide-angle lens assembly as claimed in  claim 1 , wherein the first lens further comprises a convex surface facing the object side and a concave surface facing an image side. 
     
     
         3 . The wide-angle lens assembly as claimed in  claim 1 , wherein the third lens further comprises a convex surface facing the image side. 
     
     
         4 . The wide-angle lens assembly as claimed in  claim 1 , wherein the fourth lens further comprises a convex surface facing the object side and another convex surface facing the image side. 
     
     
         5 . The wide-angle lens assembly as claimed in  claim 1 , wherein the fifth lens further comprises a convex surface facing the object side and a concave surface facing the image side. 
     
     
         6 . The wide-angle lens assembly as claimed in  claim 1 , wherein the fifth lens further comprises a concave surface facing the object side and a concave surface facing the image side. 
     
     
         7 . The wide-angle lens assembly as claimed in  claim 1 , further comprising a sixth lens disposed between the third lens and the fourth lens, wherein the sixth lens is with negative refractive power. 
     
     
         8 . The wide-angle lens assembly as claimed in  claim 7 , wherein the sixth lens further comprises a concave surface facing the object side and another concave surface facing the image side. 
     
     
         9 . The wide-angle lens assembly as claimed in  claim 1 , wherein the wide-angle lens assembly satisfies at least one of following conditions:
   1 <f   2   /f   4 <3;     0.5 <f   1   /f   5 <1.5;     3 <R   11   /R   12 <5;     −11 <R   31   /R   32 <−3;
     −20<TTL/ T   1 <21.5;
     8<TTL/ T   3 <10;     10<TTL/ T   4 <13;     72.08<TTL/AT 34 <114.3;     106.3<TTL/AT 45 <115;   wherein f 1  is the effective focal length of the first lens, f 2  is the effective focal length of the second lens, f 4  is an effective focal length of the fourth lens, f 5  is an effective focal length of the fifth lens, R 11  is a radius of curvature of the object side surface of the first lens, R 12  is a radius of curvature of the image side surface of the first lens, R 31  is a radius of curvature of the object side surface of the third lens, and R 32  is a radius of curvature of the image side surface of the third lens, TTL is an interval from the object side surface of the first lens to an image plane along the optical axis, T 1  is a thickness of the first lens, T 3  is a thickness of the third lens, T 4  is a thickness of the fourth lens, AT 34  is an air-interval from the third lens to the fourth lens along the optical axis, and AT 45  is an air-interval from the fourth lens to the fifth lens along the optical axis.   
     
     
         10 . A wide-angle lens assembly, comprising sequentially from an object side to an image side along an optical axis:
 a first lens which is a meniscus lens with negative refractive power;   a second lens which is a meniscus lens with positive refractive power;   a third lens with positive refractive power, comprising a convex surface facing the object side;   a fourth lens with positive refractive power, comprising a convex surface facing the object side; and   a fifth lens with negative refractive power;   wherein the wide-angle lens assembly satisfies:
   −3 <f   2   /f   1 <−1;
 
   wherein f 1  is an effective focal length of the first lens and f 2  is an effective focal length of the second lens.   
     
     
         11 . The wide-angle lens assembly as claimed in  claim 10 , wherein the first lens further comprises a convex surface facing the object side and a concave surface facing an image side. 
     
     
         12 . The wide-angle lens assembly as claimed in  claim 10 , wherein the second lens further comprises a concave surface facing the object side and a convex surface facing the image side. 
     
     
         13 . The wide-angle lens assembly as claimed in  claim 10 , wherein the third lens further comprises a convex surface facing the image side and the fourth lens further comprises a convex surface facing the image side. 
     
     
         14 . The wide-angle lens assembly as claimed in  claim 10 , wherein the fifth lens further comprises a convex surface facing the object side and a concave surface facing the image side. 
     
     
         15 . The wide-angle lens assembly as claimed in  claim 10 , wherein the fifth lens further comprises a concave surface facing the object side and a concave surface facing the image side. 
     
     
         16 . The wide-angle lens assembly as claimed in  claim 10 , further comprising a sixth lens disposed between the third lens and the fourth lens, wherein the sixth lens is with negative refractive power. 
     
     
         17 . The wide-angle lens assembly as claimed in  claim 16 , wherein the sixth lens further comprises a concave surface facing the object side and another concave surface facing the image side. 
     
     
         18 . The wide-angle lens assembly as claimed in  claim 10 , wherein the wide-angle lens assembly satisfies at least one of following conditions:
   1 <f   2   /f   4 <3;     0.5 <f   1   /f   5 <1.5;     3 <R   11   /R   12 <5;     −11 <R   31   /R   32 <−3;
     −20<TTL/ T   1 <21.5;
     8<TTL/ T   3 <10;     10<TTL/ T   4 <13;     72.08<TTL/AT 34 <114.3;     106.3<TTL/AT 45 <115;   wherein f 1  is the effective focal length of the first lens, f 2  is the effective focal length of the second lens, f 4  is an effective focal length of the fourth lens, f 5  is an effective focal length of the fifth lens, R 11  is a radius of curvature of the object side surface of the first lens, R 12  is a radius of curvature of the image side surface of the first lens, R 31  is a radius of curvature of the object side surface of the third lens, and R 32  is a radius of curvature of the image side surface of the third lens, TTL is an interval from the object side surface of the first lens to an image plane along the optical axis, T 1  is a thickness of the first lens, T 3  is a thickness of the third lens, T 4  is a thickness of the fourth lens, AT 34  is an air-interval from the third lens to the fourth lens along the optical axis, and AT 45  is an air-interval from the fourth lens to the fifth lens along the optical axis.   
     
     
         19 . A wide-angle lens assembly, comprising sequentially from an object side to an image side along an optical axis:
 a first lens which is a meniscus lens with negative refractive power;   a second lens which is a meniscus lens with positive refractive power, comprising a concave surface facing the object side and a convex surface facing the image side;   a third lens with positive refractive power, comprising a convex surface facing the object side;   a sixth lens with negative refractive power;   a fourth lens with positive refractive power; and   a fifth lens with negative refractive power.   
     
     
         20 . The wide-angle lens assembly as claimed in  claim 19 , wherein the sixth lens further comprises a concave surface facing the object side and another concave surface facing the image side and the wide-angle lens assembly satisfies:
   −3 <f   2   /f   1 <−1 ;
   
       wherein f 1  is an effective focal length of the first lens and f 1  is an effective focal length of the second lens.

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