Patent ID: 7391581
Filing Date: 2008-06-24
Classification: G02B

Abstract:
1. A lens barrel for holding an optical lens system including a plastic lens formed by molding therein, said plastic lens ending up having decentering eccentricity of an optical axis from a geometric axis thereof due to a manufacturing error entailed by a molding die used for said plastic lens, said lens barrel comprising: a lens holding barrel for fixedly holding said plastic lens therein; and locating and joining means for placing said plastic lens in a location where said plastic lens is in a desired axial position and an optical axis of said plastic lens is coaxial with a geometric axis of said lens holding barrel and fixedly joining said plastic lens to said lens holding barrel in said location; wherein said axial projections are fitted in said axial bores of one of said at least two sets selected for axial position adjustment of said plastic lens of one of said groups selected for coaxial adjustment of said plastic lens, respectively, so as thereby to place said plastic lens in said location and join said plastic lens to said lens holding barrel.