JPS58130301A - Optical fiber cable for power light - Google Patents

Abstract

PURPOSE:To make measure against accidents safe without degrading flexibility by providing a protective layer on the outside circumference of an optical fiber for conducting power light, winding a fusible conductor spirally around the protecting layer, and further covering a sheath consisting of rubber or the like on the outside circumference thereof. CONSTITUTION:A protecting layer 3 consisting of rubber or plastics is provided on the outside circumference of an optical fiber 2 for conducting power light such as a laser knife or the like and a fusible conductor 6 having the characteristics that the conductor is fused and cut when irradiated with said power light is wound spirally on the outside circumference of the layer 3. Then, a sheath 7 consisting of rubber or plastics is coated on the outer side of the conductor 6, whereby an optical fiber cable 1 for power light having flexibility is formed. The conductor 6 is of the construction wherein copper wires 6A are wound on low m.p. metallic tapes 6B of lead or the like. Said conductor is connected to a disconnection detector 10, and when the fiber 1 is disconnected by an accident, the conductor 6 is fused and cut to interrupt the supply of a power light generator 9 immediately. Thus, the flexible cable which prevents the generation of the damage by the leakage of the power light is obtained.

Description

[Detailed Description of the Invention] The present invention relates to a four-way optical fiber cable used for transmitting power light in a laser scalpel, laser processing machine, etc. This type of power optical fiber cable is In the event of an accident, when the original fiber is disconnected, it is necessary to take care to ensure that the powerful 14W and 7W does not dissipate from the disconnection point and cause damage to the human body or equipment.For this reason, conventional power As shown in FIG. 1, the optical fiber/4 cable 1 protects the outer periphery of an optical fiber 2 for guiding light with a protective layer 3 made of rubber or plastic. It has a structure in which the outer periphery of the pipe 3 is covered with a metal pipe 4, and the outer periphery is further covered with a sheath 5 made of rubber or plastic, so that when an accident occurs, the light leaking from the accident location is transferred to the metal pipe 4. Noshin Eve 4 was traced and made sure not to leak it to the outside.

However, the A-war optical fiber cable l provided with such a metal die 4 has the drawback that the flexibility of the cable l is significantly impaired, resulting in poor workability.

An object of the present invention is to provide an optical fiber cable for power light that can take measures against accidents without impairing its flexibility.

The optical fiber cable for two-to-one optical fiber according to the present invention is
A protective layer made of rubber or plastic is provided around the outer periphery of the original fiber that guides the working light, and a fusible cut-off conductor having a characteristic of melting when irradiated with the working light is spirally provided around the outer periphery of the protective layer. The tortoise is characterized in that the outer periphery of the protective layer provided with the fusible conductor is covered with a sheath made of rubber or plastic.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 2, the power source optical fiber cable 1 of this embodiment includes an optical fiber 2 for guiding power light, and the outer periphery of the optical fiber 2 is made of rubber or plastic.

The shoe is covered with a flexible sheath 3 that has a flexible sheath.

On the outer periphery of the flexible protective layer 3, there are two tape-shaped fusible conductors 6 that have the property of melting when irradiated with power light.
are insulated from each other and wound spirally. One ends of these two fusible conductors 6 are short-circuited to each other to form a folded detection line. The tape-shaped fusible conductor 6 is made of, for example, lead or other material. The outer periphery of the flexible protective layer 3 provided with such a fusible conductor 6 is covered with a flexible sheath 7 made of rubber or plastic.

Figure 3 shows such a /l optical fiber cable I.
One end of one pull l used as a cable for the rede scalpel 8 is connected to the power light generator 9, and the laser scalpel 8 is connected to the other end. Optical fiber cable for power light
The end of the fusible disconnected conductor 6 inside is connected to a disconnection detector 10. When the disconnection detector IO detects a disconnection, it controls the second light generator 9 and stops the supply of power light to the optical fiber cable 1 for power light.

With such a configuration, when the optical fiber 2 is broken midway due to an accident and power light leaks from the broken point, the fusible conductor 6 is fused by the power light. The breakage of the fusible conductor 6 is detected by a well-known disconnection detector 10, and the power light generator 9 is immediately controlled to stop the supply of power light to the optical fiber 2. In this way, damage caused by leakage of light can be eliminated.

In the present invention, the thickness of the tape-shaped fusible conductor 6 is preferably 1 or less because the thinner it is, the better the sensitivity is. Further, the width L of the fusible conductor 6 is preferably as narrow as possible since it can be fused more quickly than light.

The thickness of the fusible cut conductor 6 is thin (for example, 25μ) 1 the protective layer 3
If it is difficult to wrap the conductor around the outer periphery of the conductor, the fusible conductor 6 may be attached to a polyethylene plastic film 11 and wound as shown in FIG.

(9) By reducing the width or diameter of the fusible conductor 6 in order to improve the fusing characteristics, the fusible conductor 6 on the surface of the protective layer 3 is reduced.
If the coverage ratio of the conductor 6 decreases, the coverage ratio can be improved by making the fusible conductor 6 multi-stranded.

Furthermore, if the wire length of the fusible breakable conductor 6 is long and the electrical resistance is high, making it difficult to detect the disconnection, a good electrical conductor 6A such as copper may be used as the fusible breakable conductor 6, as shown in FIG. By using a tape-like material stretched at appropriate intervals on the melting point metal tape 6B, the electrical resistance value can be lowered and disconnection can be easily detected.

Note that the fusible breakable conductor 6 may have a single helical winding structure, and lead fasteners may be connected to both ends of the wire in the length direction to connect to a disconnection detector to detect disconnection.

As explained above, in the /4-wire optical fiber cable according to the present invention, the fusible disconnectable conductor is spirally provided around the outer periphery of the protective layer that protects the optical fiber and the When the fiber is disconnected, the fusible conductor is fused by the light leaking from the disconnected point, and by detecting the fusion, it is possible to immediately stop the supply of the 2-2 light, and to prevent the leakage of the 2-2 light. It is possible to prevent damage caused by Further, in the present invention, a spiral fusible conductor is used instead of a metal pipe, which improves the flexibility of the cable and prevents deterioration of workability.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional power source fiber optic cable, FIG. 2 is a vertical cross-sectional view showing an example of a /f power optical fiber cable according to the present invention, and FIG. A schematic configuration diagram showing an example of the usage state of such a cable, and FIGS. 4 and 5 are a perspective view and a plan view showing two other examples of the fusible breakable conductor used in the present invention. l... Ex-Fino 9 cable for power light, 2...
Optical fiber, 3...protective layer 1.6...fusible cut conductor,
7... Sheath, 8... Ledemes, 9... Arm power source generator, 10... Disconnection detector.

Claims (1)

[Claims] A protective layer made of rubber or plastic is provided around the outer periphery of the original fiber that guides the power light, and a fusible cut-off conductor having a characteristic of melting when irradiated with the power light is provided in a spiral shape around the outer periphery of the protective layer. , and a sheath made of rubber or plastic is coated on the outer periphery of the protective layer provided with the fusible cut conductor.