Patent ID: 9057816
Filing Date: 2015-06-16
Classification: C03C,G02B

Abstract:
1. A resin-coated optical fiber, comprising at least: a glass optical fiber composed of a core and a clad for coating the core; a primary layer made of UV-curing resin in contact with the glass optical fiber; and a secondary layer made of UV-curing resin disposed on an outer periphery of the primary layer, wherein the primary layer has a two-layer structure of an inner layer directly in contact with a surface of the clad, and an outer layer for coating the inner layer, wherein a Young's modulus of the UV-curing resin of the inner layer is higher than a Young's modulus of the UV-curing resin of the outer layer, and the Young's modulus of the UV-curing resin of the secondary layer is higher than the Young's modulus of the UV-curing resin of the inner layer, wherein a film thickness of the inner layer is 10 μm or less, the film thickness of the inner layer larger than a depth of a recess portion formed on a surface of the clad when the glass optical fiber is drawn, wherein the UV-curing resin of the inner layer has a Young's modulus of 0.9 MPa or more and 3.0 MPa or less at room temperature in a film state based on JIS standard K7113, and the UV-curing resin of the outer layer has a Young's modulus of 0.1 MPa or more and 0.7 MPa or less at room temperature in a film state based on JIS standard K7113, and wherein the UV-curing resin of the secondary layer has a Young's modulus of 600 MPa or more at room temperature in a film state based on JIS standard K7113.