Back to results
US 11,306,025 B2Granted
Manufacturing method of optical fiber
AssigneeFujikura Ltd.
InventorItaru Ishida
Life of this patent
Estimating the term…
Abstract
An optical fiber manufacturing method includes: drawing an optical fiber preform to form a bare optical fiber; cooling the bare optical fiber; coating an uncured coating layer that includes a resin precursor on an outer periphery of the bare optical fiber; curing the uncured coating layer to form a semi-cured coating layer; further curing the semi-cured coating layer; and cooling the semi-cured coating layer by at least one non-contact direction changer between the curing of the uncured coating layer and the curing of the semi-cured coating layer.
Claims4
An optical fiber manufacturing method comprising:
- drawing an optical fiber preform to form a bare optical fiber;
- cooling the bare optical fiber;
- coating an uncured coating layer that includes a resin precursor on an outer periphery of the bare optical fiber;
- curing the uncured coating layer to form a semi-cured coating layer;
- further curing the semi-cured coating layer;
- and
- cooling the semi-cured coating layer by at least one non-contact direction changer between the curing of the uncured coating layer and the curing of the semi-cured coating layer, wherein
- during the cooling of the semi-cured coating layer, gas is sprayed onto the semi-cured coating layer by the non-contact direction changer, the gas being air whose oxygen concentration has been adjusted to be 10% or less by adding nitrogen.
5 more elements
Dependencies are inferred from the claim text.