Imaging lens unit

An image lens unit, comprising:

• a first lens having positive (+) power and being convex toward an object side;
• a second lens having negative (−) power and being concave toward an image side;
• a third lens having positive (+) power and being concave near an axial perimeter toward the object side and convex toward the image side;
• a fourth lens having negative (−) power and being concave in the center toward the object side and convex toward the image side;
• and
• a fifth lens having a refractive power and comprising:
• an object-side surface being convex in the center and concave at the periphery, and
• an image-side surface being concave in the center and convex at the periphery,
• wherein:
• an Abbe number v1 of the first lens, an Abbe number v2 of the second lens, an Abbe number v3 of the third lens, and an Abbe number v4 of the fourth lens satisfy the following conditional expressions:
• 0<v2<30,
• 0<v4<30 and
• 0.7<(v1+v2)/(v3+v4)<1.0,
• a total focal length f of the imaging lens unit and a distance tt on an optical axis from an object-side surface of the first lens to an imaging sensor satisfy the following conditional expression:
• 0<tt/f<1.3,
• the third and fourth lenses have a meniscus shape, and
• the first lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in order from the object side toward the image side.