Patent ID: 7453655

Claim:
A lens barrel having a plastic lens provided with a flange part having first, second, third, and fourth fixed protrusions and a lens holding portion provided with first, second, third, and fourth supporting holes corresponding to the first, second, third, and fourth respective fixed protrusions of the lens, in which among the first, second, third and fourth fixed protrusions, the first, second, and third fixed protrusions are arranged in an outer peripheral portion of the flange part at predetermined intervals for providing three-point support, and the fourth fixed protrusion is arranged on a line connecting the first fixed protrusion and the center of the lens; wherein the first supporting hole corresponding to the first fixed protrusion is provided as a reference hole including an opening having substantially a same size as the first fixed protrusion; the second and third fixed protrusions have approximately a same size and the second and third supporting holes have approximately a same size and further the second and third supporting holes corresponding to the second and third fixed protrusions are provided as loosely fitting holes including openings larger than the second and third fixed protrusions; the fourth supporting hole corresponding to the fourth fixed protrusion includes an elongated hole provided in such a manner as to be elongated along a direction of the first supporting hole, and in which the lens is further provided with a gate part located outwardly adjacent to the first fixed protrusion such that said gate part protrudes outwardly from the flange part on the line connecting the first fixed protrusion and the center of the lens, said gate part being an inlet for injecting resin into a mold when molding the lens.