Patent ID: 6271973
Filing Date: 2001-08-07
Classification: G02B

Abstract:
A variable focal length lens system comprising:a first lens group having a positive refractive power;a second lens group having a positive refractive power disposed to an image side of said first lens group; anda third lens group having a negative refractive power disposed to the image side of said second lens group;wherein said third lens group consists of a positive lens element and a negative lens element arranged to the image side of said positive lens element; andwherein said first lens group, said second lens group, and said third lens group are moved toward an object in such a manner that an air gap between said first lens group and said second lens group is increased, and a space between said second lens group and said third lens group is decreased when a state of the focal length is changed from a wide-angle end state to a telephone end state; and the following condition is satisfied:0.28<f1/ft<0.48;where f1 denotes a focal length of said first lens group, and ft denotes a focal length of the lens system in the telephoto end state.