IMAGING LENS
An imaging lens includes a lens barrel, and a lens installed in a lens barrel. At least an edge surface of an edge portion on an incident surface side of the lens is formed of a diffusing surface, the edge portion being formed outside an effective diameter of the lens, to surround the lens.
1 . An imaging lens comprising a lens installed in a lens barrel, wherein
at least an edge surface of an edge portion on an incident surface side of the lens is formed of a diffusing surface, the edge portion being formed outside an effective diameter of the lens, to surround the lens.
2 . The imaging lens according to claim 1 , wherein an edge surface of the edge portion on an exit surface side of the lens is further formed of the diffusing surface.
3 . The imaging lens according to claim 1 , wherein a circumference surface of the edge portion of the lens is further formed of the diffusing surface.
4 . The imaging lens according to claim 1 , wherein the edge surface is formed in such a direction that a light beam reaching the edge surface from outside the lens is diffused and reflected more strongly in a direction toward an inner wall of the lens barrel.
5 . The imaging lens according to claim 1 , wherein the diffusing surface is a sand finish surface.
6 . The imaging lens according to claim 1 , wherein the lens is manufactured using a mold having a mold surface corresponding to the edge portion of the lens and being formed of a rough surface.
7 . The imaging lens according to claim 1 , wherein coating reducing reflectance is applied to the diffusing surface formed on the edge portion of the lens.
8 . The imaging lens according to claim 7 , wherein the coating is black coating.