Optical system for camera

Abstract

Disclosed herein is an optical system for a camera. The optical system for a camera includes: a first lens having positive refractive power and a meniscus shape concave toward an image; a second lens having negative refractive power and a shape concave toward the image; a third lens having the positive refractive power and a shape convex toward an object; a fourth lens having the positive refractive power and a shape convex toward the image; and a fifth lens having the negative refractive power, a shape convex toward the object and concave to the image, and one or more inflection point provided on an image surface.

What is claimed is: 
     
         1 . An optical system for a camera comprising:
 a first lens having positive refractive power and a meniscus shape concave toward an image;   a second lens having negative refractive power and a shape concave toward the image;   a third lens having the positive refractive power and a shape convex toward an object;   a fourth lens having the positive refractive power and a shape convex toward the image; and   a fifth lens having the negative refractive power, a shape convex toward the object and concave to the image, and one or more inflection point provided on an image surface,   wherein the first and second lenses include an aperture stop disposed therebetween in order to block unnecessary light in light passing through the optical system.   
     
     
         2 . The optical system for a camera according to  claim 1 , wherein the third lens is configured of a lens having a shape in which both surfaces thereof are convex. 
     
     
         3 . The optical system for a camera according to  claim 1 , wherein the fourth lens is configured of a lens having a meniscus shape convex toward the image. 
     
     
         4 . The optical system for a camera according to  claim 1 , wherein the fifth lens is configured of a lens having a shape concave toward the image. 
     
     
         5 . The optical system for a camera according to  claim 1 , further comprising an optical filter provided between the fifth lens and an image surface, wherein the optical filter is configured of a cover glass coated with an infrared blocking filter for blocking excessive infrared rays included in light introduced from the outside. 
     
     
         6 . The optical system for a camera according to  claim 1 , wherein the first to fifth lenses are configured of a plastic lens and have both surfaces configured of an aspherical surface. 
     
     
         7 . The optical system for a camera according to  claim 1 , wherein it satisfies the following Conditional Equation 1 with respect to chromatic aberration correction:
     f 3 /f< 2.0  [Conditional Equation 1]
   where f3 indicates a focal length of the third lens, and f indicates a focal length of the entire optical system.   
     
     
         8 . The optical system for a camera according to  claim 1 , wherein it satisfies the following Conditional Equation 2 with respect to chromatic aberration correction:
     R 31 /f< 1.2  [Conditional Equation 2]
   where R31 indicates a radius of curvature on a surface of the third lens toward the object, and f indicates a focal length of the entire optical system.