Imaging lens

An imaging lens for an image sensor which includes elements arranged in order from an object side to an image side, comprising:

• a first lens having positive refractive power and a convex surface on the object side;
• an aperture stop;
• a second lens that is a meniscus double-sided aspheric lens having negative refractive power and a concave surface on the object side;
• and
• a third lens that is a meniscus double-sided aspheric lens having positive refractive power near an optical axis and a concave surface on the image side, wherein
• a diffractive optical surface is formed on the object-side surface of the second lens;
• the aspheric object-side and image-side surfaces of the third lens have pole-change points off an optical axis;
• and
• conditional expressions (1) to (4) below are satisfied:
• 8.0<fdoe/f<26.0 (1)
• 20<vd1−vd2<40 (2)
• 20<vd3−vd2<40 (3)
• 0.8<ih/f<0.95 (4)
• where
• fdoe:
• focal length of the diffractive optical surface,
• f:
• focal length of an overall optical system of the imaging lens,
• vd1:
• Abbe number of the first lens at d-ray,
• vd2:
• Abbe number of the second lens at d-ray,
• vd3:
• Abbe number of the third lens at d-ray, and
• ih:
• maximum image height.