Patent ID: 9405101
Filing Date: 2016-08-02
CPC Classification: G02B

Claim Text:
1. An imaging lens, substantially consisting of six lenses, composed of a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power, disposed in order from the object side, wherein the imaging lens satisfies conditional expressions given below: where Db12: air space on the optical axis between the first lens and the second lens, D3: center thickness of the second lens, f2: focal length of the second lens, f: focal length of the entire system, R1f: paraxial radius of curvature of the object side surface of the first lens, and R1r: paraxial radius of curvature of the image side surface of the first lens.