| 摘要 |
PURPOSE:To position respective optical elements precisely and easily by arranging conical surfaces to be optionally engaged with each other and centered on respective axes on the peripheral part of a lens, a lens barrel, etc. which are combined with each other. CONSTITUTION:A flange-like projection part 2 projected to the inside of a radias direction is unitedly molded on the inwall of the lens barrel 1 and a contical surface 3 like a truncated cone expanded upwards is formed around the axis of the lens barrel 1 at one part of the inner peripheral surface. On the other hand, a lens 4 combined with the lens barrel 1 is obtained by unitedly molding an effective diameter part 5 and a flange 6 expanded rectangularly to the optical axis at the periphery and a conical surface 7 to be optionally engaged with the conical surface 3 of the lens barrel 1 is formed around the optical axis on the outer periphery of the flange part 6. The axes of the lens barrel 1 and the lens 4 are matched and combined with each other by engaging the lens barrel 1 and the lens 4 through the conical surfaces 3, 7 and laser beams are irradiated to weld the engaged part. |
