PRODUCTION OF OPTICAL FIBER CORE

摘要

PURPOSE:To obtain the titled optical fiber core consisting of a molten liq. crystalline high molecular substance exhibiting a stabilized characteristic by evacuating the space between an optical fiber strand and a molten thermoplastic resin and simultaneously compressing from the outer side of the thermoplastic resin. CONSTITUTION:In the production of an optical fiber core by forming the secondary coated layer 4 of a molten liq. crystalline high molecular substance (hereinafter referred to as LCP) on the outer periphery of an optical fiber strand 3, the space between the optical fiber strand 3 and the molten LCP is evacuated 5 and simultaneously the optical fiber strand 3 and the secondary coated layer 4 of LCP are firmly attached by compression 8 from the outside of LCP. By this method, since the attached point 9 between the optical fiber strand 3 and the secondary coated layer 4 of LCP is controlled by both evacuation and compression, the movement of the attached point 9 causing the variations of the diameter of the optical fiber core and the inclusion of air bubbles can be easily controlled and an optical fiber core exhibiting a stabilized characteristic can be obtained.