Patent ID: 8094383

Claim:
An optical imaging lens, comprising in order along an optical axis thereof from an object side to an image side: a first lens element with positive refractive power that is a meniscus aspherical lens having a convex surface on the object side; an aperture stop; a second lens element with negative refractive power that is a meniscus aspherical lens having a convex surface on the image side; and a third lens element with positive refractive power that is an aspherical lens whose center is on the optical axis, while on the lens center, a convex surface is on the object side and a concave surface is on the image side; from the center of the third lens element toward the edge thereof, the refractive power changes from positive power, through an inflection point, to negative power; wherein the optical imaging lens satisfies conditions of 0.5 < f 1 f < 1.0 ; ⁢ - 0.3 < f 2 f < - 1.0 ; 0.05 < d 3 f < 0.2 ;  R 21 - R 22 R 21 + R 22  < 0.15 ; wherein f is effective focal length of the optical imaging lens, f 1 is effective focal length of the first lens element, f 2 is effective focal length of the second lens element, d 3 is distance from the image side of the first lens element to the object side of the second lens element, R 21 is radius of curvature of the object side of the second lens element and R 22 is radius of curvature of the image side of the second lens element.