Imaging lens comprising seven lenses of −+−−++−, −+−+++−, ++−−++−, ++−−+−− or ++−−++− refractive powers

Abstract

There is provided an imaging lens with excellent optical characteristics which satisfies demand of wide field of view, low profile and low F-number. An imaging lens comprises, in order from an object side to an image side, a first lens, an aperture stop, a second lens with positive refractive power in a paraxial region, a third lens with negative refractive power in the paraxial region, a fourth lens, a fifth lens with the positive refractive power in the paraxial region, a sixth lens being a double-sided aspheric lens, and a seventh lens with negative refractive power having an image-side surface being concave in the paraxial region and an aspheric surface having at least one pole point in a position off the optical axis.