Patent ID: 8000040
Filing Date: 2011-08-16
Classification: G02B,Y10S

Abstract:
1. An imaging lens having a plurality of lenses, comprising: a first lens in which a resin lens is bonded to a base member lens; a second lens arranged according to a prescribed positional relationship of said first lens; and a lens barrel in which said first lens and said second lens are arranged, wherein where a contour center axis is an axis passing through the center of circles along respective contours of said base member lens, said resin lens, and said second lens, where a barrel center axis is an axis passing through the center of said lens barrel, where one of said contour center axis and said barrel center axis is a prescribed center axis, where a first transmission decentration amount is a positional displacement amount, with respect to an optical axis, of a position where an image is formed by light transmitted through said base member lens before having said resin lens bonded to the base member lens and through said second lens, attributed to a positional displacement amount, with respect to said prescribed center axis, of an incident surface center and an output surface center of said base member lens before having said resin lens bonded to the base member lens and attributed to a positional displacement amount, with respect to said prescribed center axis, of an incident surface center and an output surface center of said second lens, and where a second transmission decentration amount is a positional displacement amount, with respect to said optical axis, of a position where an image is formed by light transmitted through said resin lens, attributed to a positional displacement amount, with respect to said prescribed center axis, of an incident surface center and an output surface center of said resin lens, in said first lens, said resin lens is bonded to said base member lens, having said output surface center of said resin lens and said output surface center of said base member lens displaced from each other by a prescribed amount, so that said first transmission decentration amount is cancelled by said second transmission decentration amount when taken as a whole lens system including said first lens and said second lens.