Patent ID: 9678310
Date: 2017-06-13
CPC Classifications: G02B

Claim:
1. An imaging lens consisting of five lenses, including, in order from the object side to the image side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; and a fifth lens having a negative refractive power; an aperture stop being positioned at the object side of the surface toward the object side of the first lens; and the conditional formulae below being satisfied: wherein f is the focal length of the entire lens system, fl is the focal length of the first lens, and TL is the distance along the optical axis from the surface of the first lens toward the object side to the paraxial focal point position at the image side in the case that the portion corresponding to back focus is an air converted length.