Imaging lens

An imaging lens for a solid-state image sensor in which lenses are arranged in order from an object side to an image side, comprising:

• a first lens with positive refractive power having a convex surface on the object side near an optical axis;
• a second lens having a positive meniscus shape near the optical axis;
• a third lens with positive refractive power having a convex surface on the image side near the optical axis;
• and
• a fourth lens with negative refractive power having a concave surface on the image side near the optical axis,
• wherein both surfaces of each lens are aspheric;
• wherein the image-side aspheric surface of the fourth lens has a pole-change point in a position off the optical axis;
• and
• wherein conditional expressions (1) and (2) below are satisfied:
• 0.75<TLA/(2IH)<0.90 (1)
• 0.90<TLA/f<1.30 (2)
• where
• TLA:
• distance on the optical axis from the object-side surface of the first lens to an image plane of the image sensor when a filter between the fourth lens and the image sensor is removed
• IH:
• maximum image height
• f:
• focal length of an overall optical system of the imaging lens.