Patent ID: 9285565
Filing Date: 2016-03-15
CPC Classification: G02B,G03B

Claim Text:
1. An imaging lens, substantially consisting of five lenses, composed of: a first lens having a positive refractive power and a convex surface on the object side; a second lens having a negative refractive power and a concave surface on the object side; a third lens having a negative refractive power and a meniscus shape with a convex surface on the object side; a fourth lens having a positive refractive power and a meniscus shape with a concave surface on the object side; and a fifth lens having a negative refractive power and a concave surface on the image side, the image side surface having an aspherical shape with at least one inflection point located inward in a radial direction from the intersection between the image side surface and a principal ray of the maximum angle of view toward the optical axis, disposed in order from the object side, wherein the imaging lens satisfies conditional expressions given below: where f: focal length of the entire system, f1: focal length of the first lens, f5: focal length of the fifth lens, TTL: distance on the optical axis from the object side surface of the first lens to the image plane when the back focus is expressed in air equivalent distance, and ω: maximum half angle of view when an object at infinity is in focus.