Patent ID: 6970306

Claim:
An imaging lens, comprising: a lens system, the lens system including, in order from an object side: a positive first lens with a convex surface facing the object side; an aperture stop provided on one of the object side and an image side of the first lens; a meniscus second lens with a concave surface facing the object side; and a meniscus third lens with a convex surface facing the object side; wherein: at least one of the first lens and the second lens includes an aspheric surface; the third lens is a biaspheric lens; the second lens and the third lens have paraxial focal lengths with different signs; the following condition is satisfied, 1.25 <v max/ v min, where v max and v min are a maximum Abbe number and a minimum Abbe number among the lenses, respectively; and at least one biaspheric lens of the lens system satisfies the following condition, 1.0 t max/ t min<1.4, where t min and t max are thicknesses of a thinnest part and a thickest part of the biaspheric lens, respectively, measured parallel to an optical axis in an effective diameter in which a light beam passes through.