JPS59129802A - Optical transmission line - Google Patents

Abstract

PURPOSE:To prevent a glass fiber from being broken by burying a core wire together with the glass fiber a protective tube, and suppressing a flexure of the protective tube to a bending limit or below. CONSTITUTION:A core wire 4 is buried together with a glass fiber 1 in a protective tube 2. In this way, even if a bending force within a prescribed force works on the protective tube 2, a flexture of the protective tube 2 is suppressed to the bending limit or below of the glass fiber by burying the core wire 4 having regidity of an extent that it is bent only to the bending limit or below of the glass fiber 1, in the protective tube 2, and it is prevented that the glass fiber 1 is bent exceeding its bending limit. Accordingly, the glass fiber 1 is prevented from being broken.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an optical transmission line for transmitting light, such as images, illumination light, laser light, etc., through a glass fiber whose outer periphery is covered with a protective tube. It is something.

(Conventional configuration and its problems) Figure 1 shows the configuration of a conventional optical transmission line, where 1 is a glass fiber that transmits images, illumination light, laser light, etc., and 2 is a glass fiber 1. It is a protective tube that covers the outer periphery of the

In the conventional example configured in this manner, the glass fiber 1 transmits the light sound incident on the light receiving end to the light emitting end, and then emits the light from the light emitting end. By the way, in order to allow the light-receiving end and the light-emitting end of the glass fiber 1 to move arbitrarily, it is necessary to make the protective chip 2 flexible to improve operability, or to absorb a certain amount of shock. However, increasing the elasticity of the protective tube 2 generally also increases its flexibility. However, since the glass fiber 1 is very brittle, when the flexibility of the protective tube 2 increases, the glass fiber 1
Since the glass fiber 1 bends beyond its bending limit and breaks, there is a drawback that light such as images, illumination light, laser light, etc. cannot be transmitted to the light emitting end of the glass fiber 1. In addition, in the case of laser light, the laser light emitted from the broken end face completely burned out the protective chip 2 and was irradiated onto peripheral equipment, the human body, etc., destroying or damaging peripheral equipment. It had drawbacks such as causing injury to the human body.

Figure 2 shows the configuration of another conventional optical transmission line, where the same reference numerals as those in Figure 1 indicate the same parts.
Further, reference numeral 3 denotes a ventilation hose through which a glass fiber 1 for laser beam transmission whose outer periphery is covered with a protective tube 2 is inserted. A gap is provided for.

In the conventional example configured in this way, the glass fiber 1 transmits the laser light incident on the light receiving end to the light emitting end, and then emits the laser light from the entire light emitting end to transmit data, or to transmit data to an object or a human body. Cutting, cutting, etc. In addition, the air passed through the hose 3 and sent to the light-emitting end of the glass fiber 1 suppresses heat generation at the light-emitting end of the glass fiber 1, and prevents heat generation from objects, human bodies, etc. irradiated with laser light. By blowing away fine particles such as smoke, it completely prevents fine particles from adhering to optical lenses, etc., and from floating on the optical path of the laser beam. By the way, in order to allow the light-receiving end and the light-emitting end of the glass fiber 1 to move arbitrarily, the protective tube 2 and the hose 3 must be made flexible in order to improve operability. However, since the glass fiber 1 is very brittle, if the flexibility of the protective tube 2 and hose 3 is increased, the glass fiber 1 will bend beyond its bending limit and break, causing the laser beam to Light emitting end 1
At the same time, the laser beam emitted from the broken end face completely burns out the protective tube 2 and hose 3, and irradiates peripheral equipment and the human body, causing destruction or damage to peripheral equipment, or causing injury to the human body. There were concerns such as causing injury.

(Object of the Invention) An object of the present invention is to suppress the deflection of the protective tube and the deflection of the protective tube and the hose to below the bending limit.

(Structure of the Invention) According to the present invention, a core wire of a glass fiber is buried in a protective tube, or a core wire of a glass fiber coated with a protective tube is inserted into a hose.

(Description of Embodiment) FIG. 3 shows the configuration of one embodiment of the present invention.
The same reference numerals as those in the figures indicate the same parts, and 4 is a core wire embedded in the protective tube 2 together with the glass fiber 1.

In this embodiment configured in this way, even if a bending force within a predetermined range is applied to the protective tube 2, the glass fiber 1
By embedding the core wire 4 in the protective tube 2 with such rigidity that it can be bent only below the bending limit of the glass fiber 1, the deflection of the protective tube 2 can be suppressed to below the bending limit of the glass fiber 1. is prevented from bending beyond its bending limit.

FIG. 4 shows the configuration of another embodiment of the present invention, and the same reference numerals as those in FIG. 2 indicate the same parts.)
Further, 5 is a glass fiber l coated on the protective tube 2.
It is also a core wire inserted into the hose 3.

In this embodiment configured in this way, even if a bending force within a predetermined range is applied to the protective cheep 2 through the entire hose 3,
By inserting a core a5t into the hose 3, which has such rigidity that it can be bent only below the bending limit of the glass fiber 1, the bending of the hose 3 is suppressed to below the bending limit of the glass fiber l, and the glass fiber 1 is prevented from bending beyond its bending limit.

In addition, the glass fiber 1 buried in the protective tube 2K is inserted into the hose 3 together with the core wire 4 in the space υ for inserting the glass fiber 1 covered by the protective tube 2 and the core wire 5 into the hose 3. Good too.

(Effects of the Invention) As explained above, according to the present invention, the core wire is embedded in the protective tube together with the glass fiber, and the core wire is inserted into the hose together with the glass fiber coated in the protective tube. Since the glass fiber can be prevented from breaking, it has the advantage that light such as images, illumination light, laser light, etc. can be transmitted to the light emitting end of the glass fiber.
In the case of laser light, it is possible to prevent the laser light from being emitted from the broken end face, which has the advantage of eliminating destruction or damage to peripheral equipment, injury to the human body, etc. caused by the laser light.

[Brief explanation of drawings]

Figures 1 and 2 are block diagrams of conventional optical transmission lines, respectively;
FIGS. 3 and 4 are configuration diagrams of embodiments of the present invention, respectively. 1...Glass fiber, 2...Protection tube, 3.
...Hose, 4,5... Core wire. Figure 1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) In an optical transmission line in which light is transmitted by a glass fiber whose outer periphery is covered with a protective tube, the entire core wire is buried together with the glass fiber in the protective tube,
An optical transmission line characterized in that the bending of the protective tube is suppressed below a bending limit by the rigidity of the core wire, thereby preventing breakage of the glass fiber. (2) In an optical transmission line in which light is transmitted through a glass fiber whose outer periphery is covered with a protective tube, a core wire is inserted into the hose together with the glass fiber covered with the protective tube, and the rigidity of the core wire is used to An optical transmission line characterized in that the glass fiber is prevented from breaking by suppressing the bending of the hose to below a bending limit.