JPS58166304A - Production of optical fiber penetration type hermetic terminal board - Google Patents

Abstract

PURPOSE:To produce a single polar or multipolar optical fiber penetrated terminal board which is made airtight by inserting one or plural pieces of treated single type optical fibers into dies for the terminal board, and molding the same into one body with an epoxy resin. CONSTITUTION:The outermost layer 3 of the single type optical fiber 2 in a terminal board 1 is partly removed to expose an intermediate layer 4 and an epoxy resin adhesive is impregnated therein and is cured in order to prevent the leakage of, for example, gaseous SFe in an electric apparatus through the fine void in the layer 4 of a fibrous material. A metallic sleeve 7 is press stuck and fixed on the layer 3 as near the boundary 6 thereof as possible in order to prevent the penetration of the adhesive in this stage. An O-ring is put into a ring groove 8 to seal a terminal board 1 in the stage of mounting said board to the apparatus body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a monopolar or multipolar epoxy resin terminal board having one or more optical fins (-) passed through it.

In recent years, the range of applications of optical fibers has become extremely wide, and in addition to general communications applications, they have also come to be used in electrical equipment. Examples of such electrical equipment include switches, transformers, and electrical equipment related to DC power transmission. In such devices, optical fibers are used to convert optical signals or electrical energy into light, introduce it, and extract it. In addition, in such equipment, maintaining the insulation properties within the equipment,
Generally, sulfur hexafluoride (SF・) gas is used for cooling, arc extinguishing, etc.
It is sealed at a constant pressure below Qfl. If the enclosed SF-gas leaks from the terminal board used in such electrical equipment, it is unacceptable because it will make the equipment itself unusable.

There are various types of optical fibers depending on their configuration, but the optical fiber used in the present invention has a diameter of, for example, 0.1-0.
6 m, usually Ojl -0,81111 (D) A single filament coated with a protective coating (hereinafter referred to as a single type optical fiber). , a cladding layer of metal or the like is provided, and the filament is surrounded by a protective coating consisting of, for example, an inner layer of nylon coating, an intermediate layer of fibrous material, and an outermost layer of polyethylene or polyvinyl chloride coating in this order. Other configurations of these protective coatings are well known and need not be discussed in detail here.

A terminal board made by casting an epoxy resin casting material has been developed as a terminal board for the above-mentioned various electric devices through which an optical fiber having such a protective coating is passed.

In such a terminal board, an airtight seal can be achieved by conventional means when attaching the terminal board itself to the machine opening, but optical fibers cannot be said to be completely airtight due to their structure, and high-pressure SF and gas inside the equipment cannot be said to be completely airtight. is the interlayer of optical fiber woven edge material.
- It had the disadvantage of leakage through mirror-like microscopic voids.

In order to eliminate the defects of the optical fiber feed-through terminal plate due to the structure of the optical fiber described above, the present inventors remove a part of the outermost layer of the protective coating, e.g. made of epoxyethylene, and expose the intermediate layer of fiber material. By impregnating this part with a low-viscosity epoxy resin adhesive and curing it, the above-mentioned microscopic voids can be sealed and the airtight sealing property can be maintained.
I discovered that. However, when impregnating and curing the epoxy resin adhesive, the epoxy resin adhesive
The impregnation does not stop at the interface of the remaining protective coating and penetrates into the gaps in the remaining outermost layer of the protective coating (
As a result, the strength of the single type optical fiber decreases, resulting in optical loss, and it has been found that some fibers may break when external stress is applied. r-, the inventors crimped and fixed a metal sleeve to each remaining end of a single optical fiber whose outermost protective coating had been removed, thereby preventing penetration of the epoxy resin adhesive. It was also discovered that it can prevent defects.

Terminal boards are manufactured by inserting one or more single optical fibers treated as described above into a mold for the intended terminal board, assembling them, and casting epoxy casting material in the usual manner. do.

The present invention will be explained below with reference to the drawings.

On the 11th side, (1) is an epoxy resin cast terminal board through which the required number of single type optical fibers (:) (8 in the illustrated example) pass through. The single type optical fiber (2) is, for example, the outermost Jl (3) made of polyethylene,
For example, the intermediate layer (4) made of a nylon fiber material has a protective coating consisting of an inner layer (6) made of, for example, nylon. In order to prevent SFs gas from leaking, a part of the outermost layer (3) of the single type optical fiber mill (located inside the terminal plate (1)) is removed to expose the fiber material intermediate layer (0). Impregnated with epoxy resin adhesive, soaked in soda and cured.

In this state, it was impossible to prevent the epoxy resin adhesive from penetrating into the protective coating from the interface (6) of the protective coating that remained unremoved in the outermost layer (3). In the present invention, in order to prevent the penetration of such epoxy resin adhesive, a metal sleeve (7) is placed as close as possible to the interface (6) of the outermost layer (3) of the protective coating. ) is crimped and fixed. (8) is an O-ring groove, which forms an airtight seal when the terminal plate (1) is attached to the device body by inserting an O-ring into the cc. (9) is a hole in which a fitting (not shown) for attaching the terminal plate (1) to the main body of the device can be inserted.

According to the present invention, the metal sleeve (7) is crimped and fixed to the single optical fiber (2) as described above, thereby preventing the adhesive from penetrating into the outermost layer of the protective coating through the interface (6). It is possible to prevent the 8.
Crack formation in a single type optical fiber that had become mK,
It is possible to eliminate defects such as defects and disconnections.

A single type optical fiber processed in this way is 1
An airtight monopolar or multipolar optical fiber penetrating terminal board can be made by inserting a plurality of terminals into a mold for the desired terminal plate and integrally molding them with epoxy resin casting material using a conventional method. .

Any commercially available epoxy resin adhesive and epoxy resin casting material used in the present invention can be used.
For example, Araldite (Switzerland: Ciba Geigy product),
Examples include Epon (USA: Shell Chemical Company product).

Further, the impregnation curing and casting curing methods themselves can be carried out by any known method.

[Brief explanation of drawings]

The false group 4 is in a longitudinal cross section showing an example of one piece of a terminal board manufactured according to the present invention. (1) is an epoxy resin terminal board, (2) is a single type optical fiber, (3) is the outermost layer of the protective coating, (4) is the fiber material intermediate phase, (5) is the inner layer of the protective coating, (6) is the interface, ( 7)
is a metal sleeve, and (8) is an O-ring groove. Representative Patent Attorney Ge Shu Xin - Procedural Amendment (Voluntary) Commissioner of the Patent Office 1, Indication of Case Patent Application No. 57-48622 2,
Title of the invention: Method for manufacturing an optical fiber penetrating hermetic terminal plate 3, Person making the amendment 5, Detailed description of the invention column 6 of the specification subject to the amendment, Contents of the amendment (1) Page 3, line 1 of the specification: Corrected to be ``of metal, etc.'' [of silicone resin, etc.]. (2) On page 3, line 2, "filament" is corrected to "filament." (3) Correct “nylon fiber material” in line 8 of page 5 to “polyamide fiber material” 0 (4) Correct “Epon” in line 3 of page 7 to “Epon” @ 1 or more

Claims (1)

[Claims] (1) In a method for manufacturing a monopolar or multipolar epoxy resin terminal board with one or more optical fibers (-) passing through, the outermost layer of the protective coating of the optical fiber/<- located inside the terminal board penetration part. removing a portion to expose the intermediate layer of fibrous material, and crimping and fixing a metal sleeve to each end of the remaining protective coating of the outermost layer adjacent to the exposed portion;
Thereafter, the exposed portion of the intermediate layer of the fiber material is impregnated with an epoxy resin adhesive and cured.
A method for manufacturing an optical fiber penetrating terminal board, which comprises inserting the terminal board into a terminal board mold, assembling the mold, and casting the terminal board with epoxy resin.