Imaging lens composed of seven optical elements

An imaging lens which forms an image of an object on a solid-state image sensor, the imaging lens comprising:

• a first optical element that is a first lens having positive refractive power and a convex object-side surface;
• a second optical element that is a second lens that is a meniscus lens having negative refractive power and a concave image-side surface;
• a third optical element that is a third lens having positive or negative refractive power and at least one aspheric surface;
• a fourth optical element that is a fourth lens having positive or negative refractive power and at least one aspheric surface;
• a fifth optical element that is a fifth lens having positive or negative refractive power and at least one aspheric surface;
• a sixth optical element that is a sixth lens that is a double-sided aspheric lens having positive or negative refractive power and a concave image-side surface with an aspheric shape, the image-side surface of the sixth lens having pole-change points separated from an optical axis of the imaging lens;
• and
• a seventh optical element that is one double-sided aspheric aberration correction optical element with virtually no refractive power located between the first lens and an image plane,
• wherein the first through sixth optical elements are arranged sequentially from an object side to an image side of the imaging lens, and
• conditional expressions (1) to (3) below are satisfied:
• 0.05<TN/f<0.35 (1)
• 0.03<dN/f<0.25 (2)
• 45<νdN<65 (3)
• where
• f is an overall focal length of the imaging lens,
• TN is a distance on the optical axis between lenses where the seventh optical element is located,
• dN is a thickness of the seventh optical element on the optical axis, and
• νdN is an Abbe number of the seventh optical element at d-ray.