Patent ID: 7486328

Claim:
A picture-taking lens for forming an image of an object image on a solid picture-taking element, comprising in order from the object side: a first lens having a positive refractive power and directing a convex surface toward the object side; an aperture stop, a second lens having a positive refractive power and a meniscus shape directing a convex surface toward the image side; and a third lens having a negative refractive power and directing a concave surface toward the image side, wherein the picture-taking lens satisfies the following conditional expression: 0.20< R 1/ f< 0.42 (1) 0.10< D 2/ f< 0.40 (2), where R 1 is a radius of curvature of the object side surface of the first lens, D 2 is an air gap on the axis between the first lens and the second lens, f is a focal length of a whole system of the picture-taking lens.