EP0364288A2
Expired / Lapsed
EP
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Optical fiber composite insulator and method of producing the same
Assignee: NGK Insulators Ltd
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Filing: 1989-10-13
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Granted: —
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Expires: 2009-10-13
Abstract
Abstract An optical fiber composite insulator comprises a hollow insulator body (1) having an axial through-hole (2) and at least one optical fiber (4) extending through the through-hole and hermetically sealed to the inner surface of the through-hole by a sealing material (6). The relationship between the condition of the inner surface of the through-hole and the sealing material, and the relationship between the inner diameters of the through-hole and the outer diameter of the hollow insulator body or a coating material on the optical fiber, are selected to provide high insulating property, mechanical strength and airtight property of the optical fiber composite insulator.
Inventors
- 👤 Shoji Seike
- 👤 Toshiyuki Mima
- 👤 Masayuki Nozaki
- 👤 Naoki Tani
- 👤 Mitsuji Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:46
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4415; G02B6/4416; G02B6/4417; G02B6/442; G02B6/46; G02B6/50; H; H01; H01B; H01B17/00; H01B17/005
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
An optical fiber composite insulator comprising a hollow insulator body having an axial through-hole and at least one optical fiber extended through the through-hole and hermetically sealed to the inner surface of the through-hole by means of a sealing material, said sealing material being an organic sealing material and the inner surface of the through-hole being a glazed surface which is applied with a glaze and fired.
Claim 2
Dependent Claim
67 words
An optical fiber composite insulator comprising a hollow insulator body having an axial through-hole and at least one optical fiber extended through the through-hole and hermetically sealed to the inner surface of the through-hole by means of a sealing material, said sealing material being an organic sealing material and the inner surface of the through-hole being a glazed surface which is applied with a glaze and fired.
Claim 3
Dependent Claim
73 words
An optical fiber composite insulator comprising a hollow insulator body having an axial through-hole and at least one optical fiber extended through the through-hole and hermetically sealed to the inner surface of the through-hole by means of a sealing material, said sealing material being an inorganic sealing material, and the inner surface of the through-hole being an unglazed surface which is not applied with a glaze and is fired or a polished surface.
Claim 4
Dependent Claim
73 words
An optical fiber composite insulator comprising a hollow insulator body having an axial through-hole and at least one optical fiber extended through the through-hole and hermetically sealed to the inner surface of the through-hole by means of a sealing material, said sealing material being an inorganic sealing material, and the inner surface of the through-hole being an unglazed surface which is not applied with a glaze and is fired or a polished surface.
Claim 5
Dependent Claim
68 words
An optical fiber composite insulator comprising a hollow insulator body having an axial through-hole and at least one optical fiber extended through the through-hole and hermetically sealed to the inner surface of the through-hole by a sealing material, a ratio d/D of the inner diameter "d" of the inner through-hole of the hollow insulator body to the outer diameter "D" of the hollow insulator being at most 0.25.
Claim 6
Dependent Claim
68 words
An optical fiber composite insulator comprising a hollow insulator body having an axial through-hole and at least one optical fiber extended through the through-hole and hermetically sealed to the inner surface of the through-hole by a sealing material, a ratio d/D of the inner diameter "d" of the inner through-hole of the hollow insulator body to the outer diameter "D" of the hollow insulator being at most 0.25.
Claim 7
Dependent Claim
22 words
An optical fiber composite insulator claimed in claim 3, wherein the inner diameter of the through-hole is at least 3 mm .
Claim 8
Dependent Claim
94 words
An optical fiber composite insulator composed of a hollow insulator body having an axial through=hole, at least one optical fiber extended through the through-hole, and hermetically sealed to the inner surface of the through-hole, the coated portion of the optical fiber being hermetically sealed to the inner surface of the through-hole by means of an organic sealing material such as silicone rubber, the coated portion of the optical fiber including a buffer layer of a resin of a Young's modulus of at least 10 kg/mn² and a tensile strength of at least 300 kg/cm².
Claim 9
Dependent Claim
94 words
An optical fiber composite insulator composed of a hollow insulator body having an axial through=hole, at least one optical fiber extended through the through-hole, and hermetically sealed to the inner surface of the through-hole, the coated portion of the optical fiber being hermetically sealed to the inner surface of the through-hole by means of an organic sealing material such as silicone rubber, the coated portion of the optical fiber including a buffer layer of a resin of a Young's modulus of at least 10 kg/mn² and a tensile strength of at least 300 kg/cm².
Claim 10
Dependent Claim
39 words
An optical fiber composite insulator claimed in claim 5, wherein the organic sealing material is silicone rubber having material properties such that an elongation at breakout is at least 300% and a tensile strength is at least 30 kg/cm².
Claim 11
Independent Claim
91 words
A method of producing the optical fiber composite insulator comprising steps of passing at least one optical fiber through a through-hole formed in a hollow insulator body and hermetically sealing the optical fiber in the through-hole by the organic sealing material such as silicone rubber, wherein a portion of the optical fiber to be sealed in the through-hole is coated by a resin of a Young's modulus of at least 10 kg/mm² and a tensile strength of at least 300 kg/cm², and a primer treatment is applied to the coated portion.
Claim 12
Independent Claim
91 words
A method of producing the optical fiber composite insulator comprising steps of passing at least one optical fiber through a through-hole formed in a hollow insulator body and hermetically sealing the optical fiber in the through-hole by the organic sealing material such as silicone rubber, wherein a portion of the optical fiber to be sealed in the through-hole is coated by a resin of a Young's modulus of at least 10 kg/mm² and a tensile strength of at least 300 kg/cm², and a primer treatment is applied to the coated portion.
Claim 13
Dependent Claim
57 words
A method as claimed in claim 7, wherein a silicone rubber is filled in a clearance between the coated portion of the optical fiber and the inner surface of the through-hole and is cured at a temperature not lower than 60°C to hermetically seal between the optical fiber and the inner surface of the hollow insulator body.
References Cited (Backward Citations)
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