Optical lens assembly and imaging device

Abstract

The present disclosure discloses an optical lens assembly and an imaging device including the same. The optical lens assembly includes seven lenses, wherein a first lens has a negative refractive power, an object-side surface thereof is a convex surface, and an image-side surface thereof is a concave surface; a second lens has a negative refractive power, and an image-side surface thereof is a concave surface; a third lens has a negative refractive power, and an object-side surface thereof is a concave surface; a fourth lens has a positive refractive power, and an object-side surface thereof is a convex surface; an object-side surface of a fifth lens is a convex surface; and a seventh lens has a positive refractive power, and an object-side surface thereof is a convex surface. The optical lens assembly satisfies TTL/h/FOV≤0.025.

What is claimed is: 
     
         1 . An optical lens assembly, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, which are sequentially arranged from an object side of the optical lens assembly to an image side of the optical lens assembly along an optical axis of the optical lens assembly,
 wherein,   the first lens has a negative refractive power, an object-side surface of the first lens is a convex surface, and an image-side surface of the first lens is a concave surface;   the second lens has a negative refractive power, and an image-side surface of the second lens is a concave surface;   the third lens has a negative refractive power, and an object-side surface of the third lens is a concave surface;   the fourth lens has a positive refractive power, and an object-side surface of the fourth lens is a convex surface;   an object-side surface of the fifth lens is a convex surface;   the seventh lens has a positive refractive power, and an object-side surface of the seventh lens is a convex surface, and   the optical lens assembly satisfies: TTL/h/FOV≤0.025,   where TTL is a distance on the optical axis from a center of the object-side surface of the first lens to an imaging plane of the optical lens assembly;   h is an image height corresponding to a maximum field-of-view of the optical lens assembly; and   FOV is the maximum field-of-view of the optical lens assembly.   
     
     
         2 . The optical lens assembly according to  claim 1 , wherein the fourth lens of the optical lens assembly satisfies: 0.4≤(|r41|+d4)/|r42|≤0.8,
 where r41 is a radius of curvature of the object-side surface of the fourth lens of the optical lens assembly; 
 d4 is a center thickness of the fourth lens of the optical lens assembly; and 
 r42 is a radius of curvature of an image-side surface of the fourth lens of the optical lens assembly. 
 
     
     
         3 . The optical lens assembly according to  claim 1 , wherein the optical lens assembly satisfies: D/h/FOV≤0.025,
 where FOV is the maximum field-of-view of the optical lens assembly; 
 D is a maximum effective aperture radius of the object-side surface of the first lens corresponding to the maximum field-of-view of the optical lens assembly; and 
 h is the image height corresponding to the maximum field-of-view of the optical lens assembly. 
 
     
     
         4 . The optical lens assembly according to  claim 1 , wherein the optical lens assembly satisfies: BFL/TTL≥0.05,
 where BFL is a distance on the optical axis from a center of an image-side surface of the seventh lens to the imaging plane of the optical lens assembly; and 
 TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging plane of the optical lens assembly. 
 
     
     
         5 . The optical lens assembly according to  claim 1 , wherein the optical lens assembly satisfies: (|r31|+d3)/|r32|≤12,
 where r31 is a radius of curvature of the object-side surface of the third lens, 
 r32 is a radius of curvature of an image-side surface of the third lens, and 
 d3 is a center thickness of the third lens. 
 
     
     
         6 . The optical lens assembly according to  claim 1 , wherein the optical lens assembly satisfies: d12/TTL≥0.035,
 where d12 is an air interval between the sixth lens and the seventh lens, and 
 TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging plane of the optical lens assembly. 
 
     
     
         7 . The optical lens assembly according to  claim 1 , wherein the optical lens assembly satisfies: (FOV×F)/h≥45,
 where FOV is the maximum field-of-view of the optical lens assembly; 
 F is a total focal length of the optical lens assembly; and 
 h is the image height corresponding to the maximum field-of-view of the optical lens assembly. 
 
     
     
         8 . The optical lens assembly according to  claim 1 , wherein a focal length F2 of the second lens and a focal length F3 of the third lens satisfy: F3/F2≤1.6. 
     
     
         9 . The optical lens assembly according to  claim 1 , wherein a focal length F7 of the seventh lens and a total focal length F of the optical lens assembly satisfy: F7/F3. 
     
     
         10 . The optical lens assembly according to  claim 1 , wherein a combined focal length F56 of the fifth lens and the sixth lens and a total focal length F of the optical lens assembly satisfy: F56/F≤−10. 
     
     
         11 . The optical lens assembly according to  claim 1 , wherein the fifth lens and the sixth lens are cemented to form a cemented lens. 
     
     
         12 . The optical lens assembly according to  claim 1 , wherein the optical lens assembly satisfies: d2/TTL≥0.2,
 where d2 is an air interval between the first lens and the second lens; and 
 TTL is the distance on the optical axis from the center of the object-side surface of the first lens to the imaging plane of the optical lens assembly. 
 
     
     
         13 . An imaging device, wherein the imaging device comprises the optical lens assembly of  claim 1  and an imaging element for converting an optical image formed by the optical lens assembly into an electrical signal. 
     
     
         14 . An optical lens assembly, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, which are sequentially arranged from an object side of the optical lens assembly to an image side of the optical lens assembly along an optical axis of the optical lens assembly,
 wherein,   the first lens has a negative refractive power, an object-side surface of the first lens is a convex surface, and an image-side surface of the first lens is a concave surface;   the second lens has a negative refractive power, and an image-side surface of the second lens is a concave surface;   the third lens has a negative refractive power, and an object-side surface of the third lens is a concave surface;   the fourth lens has a positive refractive power, and an object-side surface of the fourth lens is a convex surface;   an object-side surface of the fifth lens is a convex surface;   the seventh lens has a positive refractive power, and an object-side surface of the seventh lens is a convex surface; and   the optical lens assembly satisfies: D/h/FOV≤0.025,   where FOV is a maximum field-of-view of the optical lens assembly;   D is a maximum effective aperture radius of the object-side surface of the first lens corresponding to the maximum field-of-view of the optical lens assembly; and   h is an image height corresponding to the maximum field-of-view of the optical lens assembly.   
     
     
         15 . The optical lens assembly according to  claim 14 , wherein the fourth lens of the optical lens assembly satisfies: 0.4≤(|r41|+d4)/|r42≤0.8,
 where r41 is a radius of curvature of the object-side surface of the fourth lens of the optical lens assembly; 
 d4 is a center thickness of the fourth lens of the optical lens assembly; and 
 r42 is a radius of curvature of an image-side surface of the fourth lens of the optical lens assembly. 
 
     
     
         16 . The optical lens assembly according to  claim 14 , wherein the optical lens assembly satisfies: BFL/TTL≥0.05,
 where BFL is a distance on the optical axis from a center of an image-side surface of the seventh lens to an imaging plane of the optical lens assembly; and 
 TTL is a distance on the optical axis from a center of the object-side surface of the first lens to the imaging plane of the optical lens assembly. 
 
     
     
         17 . The optical lens assembly according to  claim 14 , wherein the optical lens assembly satisfies: (|r31|+d3)/|r32|≤12,
 where r31 is a radius of curvature of the object-side surface of the third lens, 
 r32 is a radius of curvature of an image-side surface of the third lens, and 
 d3 is a center thickness of the third lens. 
 
     
     
         18 . The optical lens assembly according to  claim 14 , wherein the optical lens assembly satisfies: d12/TTL≥0.035,
 where d12 is an air interval between the sixth lens and the seventh lens, and 
 TTL is a distance on the optical axis from a center of the object-side surface of the first lens to an imaging plane of the optical lens assembly. 
 
     
     
         19 . The optical lens assembly according to  claim 14 , wherein the optical lens assembly satisfies: (FOV×F)/h≥45,
 where FOV is the maximum field-of-view of the optical lens assembly; 
 F is a total focal length of the optical lens assembly; and 
 h is the image height corresponding to the maximum field-of-view of the optical lens assembly. 
 
     
     
         20 . The optical lens assembly according to  claim 14 , wherein a focal length F2 of the second lens and a focal length F3 of the third lens satisfy: F3/F2≤1.6. 
     
     
         21 . The optical lens assembly according to  claim 14 , wherein a focal length F7 of the seventh lens and a total focal length F of the optical lens assembly satisfy: F7/F≤3. 
     
     
         22 . The optical lens assembly according to  claim 14 , wherein a combined focal length F56 of the fifth lens and the sixth lens and a total focal length F of the optical lens assembly satisfy: F56/F≤−10. 
     
     
         23 . The optical lens assembly according to  claim 14 , wherein the fifth lens and the sixth lens are cemented to form a cemented lens. 
     
     
         24 . The optical lens assembly according to  claim 14 , wherein the optical lens assembly satisfies: d2/TTL≥0.2,
 where d2 is an air interval between the first lens and the second lens; and 
 TTL is a distance on the optical axis from a center of the object-side surface of the first lens to an imaging plane of the optical lens assembly.