Optical imaging system and camera module

Abstract

An optical imaging system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed in order from an object side, wherein one or more of the first to sixth lenses is disposed between a stop and an imaging plane and of those, one or more has positive refractive power and one is made of a glass material, and four or more of the first to sixth lenses are made of a plastic material.

What is claimed is: 
     
         1 . An optical imaging system comprising:
 a first lens comprising negative refractive power;   a second lens comprising a refractive power;   a third lens comprising positive refractive power and a convex image-side surface;   a fourth lens comprising a convex object-side surface;   a fifth lens comprising a refractive power; and   a sixth lens comprising a convex object-side surface,   wherein the first to sixth lenses are sequentially disposed in ascending numerical order from an object side of the optical imaging system toward an imaging plane,   a thickness of the third lens is greater than a distance from the image-side surface of the third lens to the object-side surface of the fourth lens,   a thickness of the second lens is greater than a thickness of the fifth lens, and   a radius of curvature of an image-side surface of the second lens is greater than a radius of curvature of an object-side surface of the second lens.   
     
     
         2 . An optical imaging system of  claim 1 , wherein the second lens has a concave image-side surface. 
     
     
         3 . An optical imaging system of  claim 1 , wherein the third lens has a convex object-side surface. 
     
     
         4 . An optical imaging system of  claim 1 , wherein the fourth lens has positive refractive power. 
     
     
         5 . An optical imaging system of  claim 1 , wherein the fourth lens has a convex image-side surface. 
     
     
         6 . An optical imaging system of  claim 1 , wherein the fifth lens has a concave object-side surface. 
     
     
         7 . An optical imaging system of  claim 1 , wherein the fifth lens has negative refractive power. 
     
     
         8 . An optical imaging system of  claim 1 , wherein the sixth lens has positive refractive power. 
     
     
         9 . An optical imaging system of  claim 1 , wherein a focal length of the third lens is within a range of 3.0 mm to 10.0 mm. 
     
     
         10 . An optical imaging system of  claim 1 , wherein a focal length of the fourth lens is within a range of 2.0 mm to 6.0 mm.