US Patent 10488633 Imaging lens and image capturing device

An imaging lens (PL) has an image surface (I) curved to have a concave surface facing an object and comprises, in order from the object along the optical axis (Ax): a first lens (L1) having positive refractive power; a second lens (L2) having negative refractive power; a third lens (L3) having positive refractive power; a fourth lens (L4) having positive or negative refractive power; and a fifth lens (L5) having at least one lens surface formed as an aspherical surface and having negative refractive power. The following conditional expression is satisfied:0.005<f/|f4|<0.5where, f denotes a focal length of the imaging lens (PL), andf4 denotes a focal length of the fourth lens (L4).