| 摘要 |
<p>PURPOSE:To make the thickness of a coated resin film uniform by a simple means by spinning a base material for a glass fiber for optical transmission, spray-coating a resin composition on the surface of the resulting optical fiber, heating the coated surface to make the thickness of the resin film uniform, and curing the resin. CONSTITUTION:An optical fiber 2 melt-spun out of a base material 1 for a glass fiber for optical transmission is introduced into a sprayer 3, where a resin composition such as silicon resin or epoxy resin is spray-coated on the fiber 2, and the fiber 2 is introduced into a heat smoothening device 7. The preferred device 7 has a structure in which heating is carried out with air or an inert gas G heated to 400-1,000 deg.C with an electric heating wire 8 or the like. The surface of the coated resin film on the fiber 2 is heated in the device 7 to reduce the viscosity of the resin and to make the thickness uniform. At the same time, excessive resin is removed by blowing. The fiber 2 is then introduced into a curing furnace 5 to cure the resin and the fiber 2 is coiled around a coiler 6.</p> |
