| 摘要 |
PURPOSE:To form a uniform coating layer having low transmission loss, by applying a gas stream flowing along the running direction of the optical fiber to the circumference of the uncured coating layer in the coating of an optical fiber with a layer of an ultraviolet-curing resin. CONSTITUTION:The optical fiber 12 is coated with an ultraviolet-curing resin by the coating means 16 in the coating apparatus 10. The uncured coating layer 14 on the optical fiber 12 is irradiated with ultraviolet radiation by the ultraviolet radiation means 18 to obtain the cured coating layer 14'. In the above process, a vessel 22 is inserted between the coating means 16 and the ultraviolet radiation means 18, and a gas stream 20 flowing along the running direction of the optical fiber is formed around the optical fiber 12. The speed of the gas stream is made higher than the running speed of the optical fiber 12, and the gas is cooled beforehand. Since the uncured coating layer 14 is shielded from the high-temperature of the ultraviolet radiation means 18 by the gas stream 20, the fluidity increase of the uncured coating material can be prevented, the formed coating layer 14' can be uniformized, and the residual strain can be lowered.
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