| 摘要 |
PURPOSE:To obtain the lense tube unit, capable of regulating a clearance between a male tube and a female tube arbitrarily and setting the magnitude of rotating torque arbitrarily, by a method wherein the effective engaging section of the male tube between the female tube to be molded is coated by a film consisting of a soluble material and the female tube is formed utilizing the coated male tube as a male mold. CONSTITUTION:The male tube 1, consisting of metallic material (stainless steel, aluminum alloy or the like) or a resin material (polycarbonate series), is dipped into solution prepared by melting the soluble material. Next, the male tube 1, whose soluble film 2 is cured already, is mounted in a casting mold to mold the female tube 3. The female tube 3 is formed with a screw transferred from the soluble film. The soluble film 2 is molten and removed from the molded form, whose molding is finished and taken out of the mold, whereby the tube unit having a clearance S may be obtained. |
