| 摘要 |
PURPOSE:To improve the lens performance greatly by bringing plural resin-made lenses into mutual contact by integral molding. CONSTITUTION:A cylinder body 1 is molded (primarily) by using the injection metallic mold consisting of a fixed-side insert 12, a fixed mold 10, a movable mold 13 which forms the external surface of the cylinder body 1, and a movable liner 14 which forms the inner peripheral surface of a reception part 1c and the convex surface 2a and recessed part 2a of a convex lens 2. A 2nd fixed-side insert 17 is used to form the concave surface 3b of a concave lens 3 and the annular surface of a collar part 3d connecting with it, and a passage 18 for supplying resin (tertinary injected material) for molding the concave lens 3 is formed inside. In this case, plural lenses are molded out of resin in one body to securely and easily contact one another. Consequently, the adhesive strength of the border surfaces between the lenses becomes excellent and the lens performance can be improved greatly. |
