JPS62266504A - Light transmission hose - Google Patents

Abstract

PURPOSE:To surely prevent a liquid-like core material filled in a clad material from outflowing and to maintain a light transmission function over a long period, by bonding liquid-tightly sealing films or sealing plugs that cover both end aperture parts of the clad material to both end parts of the clad material. CONSTITUTION:A light transmission hose 1 is constituted by filling the inside of the cylindrical clad material 2 with liquid core material 3 having a refractive index higher than that of the clad material 2, a cylindrical window material 4 is inserted into one end part of the clad material 2 and a sealing film 5 is arranged between the clad material 2 and the window material 4. The sealing film 5 is obtained by extruding a ring-like collar body 5b integrally with the peripheral edge part of one end face of a cylindrical main body 5a whose the other end face is closed. The cylindrical main body 5a of the sealing film 5 is inserted into one end part of the clad material and at least the outer periphery of the main body 5a and the inner periphery of the clad material 2, the inside of the collar body 5b and the one end face of the clad material 2 or the inner periphery of a cylindrical joint part 5c and the outer periphery of the clad material 2 are stuck to each other with a bonding agent or the like or heat-fused. Consequently, one end aperture part of the clad material 2 is liquid-tightly closed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solution-type optical transmission hose whose core material is liquid. This invention relates to a light transmission hose whose function remains intact over a long period of time.

Problems to be Solved by the Prior Art and Invention) A transmission hose is usually a fibrous optical transmission medium consisting of a cladding material and a core material that have different refractive indexes. Since optical transmission is carried out by utilizing total reflection at the interface between the cladding material and the core material based on It has permeated a wide range of industrial fields and is used for a variety of purposes, including optical equipment, medical equipment, outdoor signboards, and various lighting methods for oil plants.

As such optical transmission hoses, all-solid optical transmission hoses, in which both the cladding material and core material are solid materials such as quartz fiber, optical glass fiber, or plastic fiber, have been put into practical use and are well known. In addition, gas Optical transmission hoses using solid or liquid core materials are also being considered.

Among these, optical transmission bows that use a gaseous core material are usually made by applying a temperature gradient to the gaseous core material sealed inside the cladding material to form a concentration difference, and a refractive index difference corresponding to this concentration difference. Furthermore, an optical transmission hose using a liquid core material utilizes the difference in refractive index between a cylindrical cladding material and a liquid cladding material filled inside the tubular cladding material.

Here, the optical transmission hose using the liquid core material will be described in more detail with reference to FIG. 25.

FIG. 25 is a schematic sectional view of a main part showing a conventional example of an optical transmission hose 1 using a liquid core material. Here, 2 in Figure 1 is a cladding material, the inside of which is filled with a liquid core material 3 having a higher refractive index than the cladding material 2, and the openings at both ends of the cladding material 2 are closed by window materials 4, respectively. It's blocked. This window material 4 not only seals the core material 3 but also performs optical functions such as guiding incident light and properly emitting light.

The optical transmission hose using the conventional liquid core material mentioned above is
Both ends of the cladding material are heat-shrinked, tied with hose bands, and rolled up with wire cables.

Tightening via sleeves, O-rings, gaskets, etc. 1 Mechanically seals the cladding material 2 and window material 4 very tightly to prevent leakage of the liquid core material. However, with the mechanical sealing method described above, over time, especially in an environment with a temperature exceeding 50°C, the gap formed at the joint surface between the cladding material 2 and the window material 4 gradually leaks. When the liquid core material 3 leaks, the liquid core material 3 flows out, and in the worst case, an unfilled portion of the core material 3, that is, a gas space such as a bubble or a gas pocket, is created inside the cladding material. This resulted in a significant loss of the optical transmission function required for the optical transmission hose.

・Therefore, although the solution-type optical transmission hose is excellent as a means of transmitting large amounts of light at low cost due to its simple structure, as mentioned above, it has the problem of leakage of the liquid core material. Therefore, a solution to this point has been sought.

The present invention has been made in view of the above circumstances, and it is possible to reliably prevent leakage of the liquid core material in an optical transmission hose using a liquid core material, thereby impairing the optical transmission function for a long period of time. The purpose of this invention is to provide a solution-type optical transmission hose that does not cause problems.

Means for Solving the Plate Point In order to achieve the above object, the solution type optical transmission hose of the present invention has a cylindrical cladding material filled with a liquid core material having a higher refractive index than the cladding material.

A window material is provided by closing the openings at both ends of the cladding material, and a sealing film or a sealing plug is provided at each end of the cladding material to cover the openings at both ends of the cladding material in a liquid-tight manner. They are joined by means such as adhesion or heat fusion.

The solution-type optical transmission hose according to the present invention has a sealing film or a sealing plug that covers the openings at both ends of the cladding material and is liquid-tightly bonded to both ends of the cladding material, so that the inside of the cladding material can be filled. The leakage of the liquid core material is reliably prevented, and therefore the optical transmission function can be maintained for a long period of time. below.

Representative embodiments of the present invention will be described with reference to FIGS. 1 to 23.

In the following examples, only the configuration on one end side of the cladding material will be described, and the configuration on the other end side is the same as the configuration on the one end side.

The explanation will be omitted.

Figure 1 shows an optical transmission hose 1 according to an embodiment of the present invention, in which a cylindrical cladding material 2 is filled with a liquid having a higher refractive index than the cladding material 2. Core material 3
The cladding material 2 is filled with cylindrical window material 4 and a cylindrical window material 4 is inserted into one end of the cladding material 2.
A sealing film 5 is interposed between the window material 4 and the window material 4 .

This sealing film 5 has a cylindrical main body 5a with one end closed and a ring-shaped flange 5b integrally protruding from the outer periphery of the other end, and a cylindrical joint body 5b on the outer periphery of the inner surface of the flange 5b. 5o is integrally provided in a protruding manner. In this case, this first
In the example of the figure! The outer diameter of the cylindrical main body 5a is the same as the inner diameter of one end of the cladding material 2, the axial length of the cylindrical main body 5a is the same as the axial length of the window material 4, and the diameter of the ring-shaped flange 5b is the same. The width in the direction is the same as the width in the radial direction of one end surface of the cladding material 2. The cylindrical main body 5a of the sealing film 5 is fitted into one end of the cladding material 2, and the outer circumferential surface of the cylindrical main body 5a, the inner circumferential surface of the cladding material 2, and the inner surface of the ring-shaped flange body 5b. One end surface of the cladding material 2, the inner circumferential surface of the cylindrical joint portion 5c, and at least one of the outer circumferential surfaces of the cladding material 2 are bonded or thermally fused with an adhesive or the like, so that the cladding material 2
One end of the opening is liquid-tightly closed.

In this state where the sealing film 5 is liquid-tightly bonded to the cladding material 2, the window material 4 is fitted into the cylindrical main body 5a of the sealing film 5, and therefore, with this configuration, the cladding film 5 is This ensures that the liquid core material 3 sealed within the material 2 is prevented from leaking.

In addition, when bonding the sealing film 5 to the cladding material 2, adhesion or thermal fusion between the outer circumferential surface of the cylindrical main body 5a and the inner circumferential surface of the cladding material 2 may cause the liquid core material 3 to seep into the joint. If the joining is obstructed, it is preferable to bond or heat-seal other parts. Furthermore, the adhesion or thermal fusion may be full-surface bonding or partial bonding, and furthermore, bonding between the sealing film 5 and the window material 4 is not necessarily required.

Here, clad material 2. Liquid core material 3. As the material for the window material 4, any commonly used material can be used.

In this case, the window material 4 disposed at both ends of the cladding material 2 has a manual guidance function, etc. for the light incidence part to direct the incident light into the core material 3 of the optical transmission hose at a certain angle. The light emitting section is provided with the output guidance function required to accurately input optical signals to these devices depending on the device to be connected. It is equipped with lenses, optical filters, thermal filters, etc. for condensing light, diffusing light, and selectively transmitting and absorbing light in specific wavelength ranges, and also for the connection parts that connect optical transmission hoses. In order to prevent light loss, the core material 3 is made of a material having substantially the same refractive index as that of the core material 3 and having excellent light transmittance. Examples of materials forming the window material 4 include fused silica, boric acid glass, pudding glass, crown glass, soda glass, chalcogenide glass, fluoride glass, lithium fluoride,
Sodium fluoride, calcium fluoride, barium fluoride, sodium chloride, calcium chloride, potassium chloride, thallium bromide, thallium iodide, KR8-5, KR3-6, sapphire, crystal, magnesia, titania, alumina, silicon,
Germanium, polystyrene, ABS copolymer, AS copolymer, styrene-maleic acid resin, methyl methacrylate-styrene copolymer resin, styrene-maleic anhydride resin, methacrylic resin, cellulose acetate, polyester carbonate, polyester, polymethyl One or more of pentene, polyarylate, polyether sulfone, polyether ether ketone, polycarbonate, nylon, polysulfone, etc. or 28! The above are mentioned,
Depending on the functions required of the window material 4, it is molded from a composition obtained by further adding pigments to these materials or a composite material obtained by combining the above materials, and a thin film of coloring material is added to the surface of the molded product. It is also possible to use the window material 3 after surface treatment.

Furthermore, the sealing film 5 should have excellent light transmittance.

It is preferable that the sealing film 5 has excellent flexibility and excellent adhesion and heat-sealing properties with the cladding material 2. Furthermore, when the sealing film 5 contacts the core material 3, it is preferable that the sealing film 5 has excellent adhesion and heat fusion properties with the cladding material 2. It is preferable that the sealing film 5 has solvent resistance against the liquid constituting the core material 3 at the contact portion thereof, and similarly, when the sealing film 5 is exposed to heat, light, oxygen, ozone, etc., it is stable against these. Something is preferable. Furthermore, if necessary, the sealing film 5 may have an optical filter effect such as wavelength selectivity for transmitted light.

It is also possible to impart functions such as antireflection effects and thermal filtering effects.

As the material for forming the sealing film 5, materials having the properties described in 1-1 are appropriately selected, and from this point of view, thermoplastic resins and nidistomers are suitable. Specifically, polyethylene,
Polypropylene, polyester, polyamide, natural rubber, synthetic polyisoprene, polybutadiene, styrene-butadiene copolymer, butyl rubber, EPDM, halogenated butyl rubber.

Chloroprene rubber, acrylonitrile-butadiene J (
Polymer, halogenated polyethylene, polyacrylonitrile, acrylonitrile-methyl methacrylate copolymer, polystyrene, acrylonitrile-styrene copolymer, ABS, styrene-methyl methacrylate copolymer, polymethyl methacrylate, cellulose acetate, polyacrylate, polycarbonate , polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, ionomer, ethylene-ethyl acrylate copolymer, polymethylpentene, polyfluoroisopropyl methacrylate-1, polydimethylsiloxane, polyvinyl acetate.

Polytetrafluoroethylene, polyacetal.

Polyvinylidene fluoride, polyvinyl fluoride, polymonochlorotrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkoxyethylene copolymer, tetrafluoroethylene-vinylidene fluoride Examples include one or more of copolymers, vinylidene fluoride-hexafluoropropylene copolymers, and the like.

In addition, when forming a film using the above-mentioned material in order to provide the sealing film 5 with the above-mentioned functions such as optical filtering effect, anti-reflection effect, thermal filtering effect, etc., a compounding agent such as a dye is added to the above-mentioned material. Alternatively, the light-transmitting portion of the sealing film may be coated with an antireflection film.

Further, the sealing film 5 formed of the above material may have either a single layer structure or a laminate structure. In this case, the laminate structure may be a full laminate structure or a partially laminate structure, and can be constructed from an appropriate material. For example, a film made of a material that has excellent adhesiveness and heat fusion properties with the cladding material 2 is placed on the part that joins with the cladding material 2, and the part that comes into contact with the core material 3 has heat resistance, light resistance, and ozone resistance. Core material 3 is used to place a film with excellent durability and trauma resistance, or to place emphasis on optical properties.
A full-scale laminate structure in which the material of the surface layer is partially changed to give each part the necessary properties, such as placing a single layer film with excellent light transmittance in the intervening part between the window material 4 and the window material 4, or A partially laminated structure can be used.

Furthermore, the thickness of the sealing film 5 varies depending on the optical properties such as light transmittance of the material constituting it, the properties such as flexibility and mechanical strength, and also depends on the dimensions of the inner and outer diameters of the cladding material. The required range varies depending on the size and is not particularly limited, but it is usually 20 μm to 500 μm, especially 50 μm.
A thickness of 1000 μm is preferable.

When bonding the sealing film 5 to the cladding material 2, it is preferable to perform pre-cleaning treatment such as degreasing with a solvent on the joint portion of the sealing film 5 and the cladding material 2, and if necessary, when bonding is performed. Sealing film 5. In order to provide stronger adhesion to the joint portion of the clad material 2, it is preferable to perform mechanical roughening treatment, corona discharge treatment, plasma treatment, metallic sodium solution treatment, flame treatment, etc.

In addition, in order to attach the liquid-tight sealing film 5 without creating a gap at the adhesive or heat-sealing location, the hose band is fastened at appropriate times during the process of adhesion or heat-sealing.

Winding with wire cable, sleeve, O-ring,
It can be fixed by tightening with a gasket or the like.

As mentioned above, when pre-cleaning treatment is performed as necessary, treatment for improving adhesion is performed on the edges of the cladding material 2 and necessary parts of the sealing film 5, and when adhesion is performed, the cladding material is If heat-sealing is performed after applying adhesive to the ends of the cladding material 2 and necessary parts of the sealing film 5, the cladding material 2 is directly applied.
After attaching the sealing film 5 to the ends of the cladding material 20, the openings at both ends of the cladding material 2 are closed by arranging the window material and sealing the both ends of the cladding material 20 directly or using the fixing means described above. The sealing film 5 is attached by bonding the film 5 and maintaining it at a predetermined temperature for a necessary time. In this last process, heating is applied when bonding is performed using a thermosetting adhesive or heat fusion. Heating is performed in a furnace, a micro burner, an air heater, etc.

In addition, when joining using an adhesive, various adhesives can be used such as room temperature curing type, thermosetting type, photo curing type, etc. Specifically, fluororesin type, silicone type, epoxy type, etc.
Phenol-based, urethane-based.

Diene type, butyral type, formal type, polyester type, polyamide type, polyamide-imide type.

Cellulose-based, polyimide-based, polyolefin-based.

Polyacrylate type, ionomer type, cyanoacrylate type, DAP resin type, melamine resin type.

Examples include urea resins, and one or more of these may be used.

2 to 15 show other embodiments of the present invention.

That is, in the embodiment shown in FIG. 2, the axial length of the cylindrical main body 5a of the sealing film 5 is formed to be longer than the axial length of the window material 4.

This is an example in which the window material 4 is deeply inserted into the cladding material 2,
In this example, the joint area between the outer circumferential surface of the cylindrical main body 5a and the inner circumferential surface of the clad material 2 can be increased. Third
The figure shows an example in which, contrary to FIG. 2, the axial length of the cylindrical main body 5a is formed shorter than the axial length of the window material 4, and a part of the window material 4 protrudes outward from one end of the cladding material 2. be. Here, long-distance optical transmission is possible by fitting the protrusion of the window material 4 in the embodiment shown in FIG. 3 into the cylindrical main body 5a in the embodiment shown in FIG. 2 and connecting the optical transmission hoses to each other. becomes.

In addition, when making connections, it is preferable to perform the connection in such a way as to prevent optical loss at the connection part.In this case, in order to prevent reflection at the connection part, the connection should be made using a connecting material that takes into account the refractive index of the connection part. can be done.

Further, the window material 4 used has a refractive index approximately the same as that of the core material 3.

The embodiment shown in FIG. 4 is an example in which the sealing film 5 has a cylindrical main body 5a and a ring-shaped flange 5b, and the embodiments shown in FIGS. 5 and 6 each have a cylindrical main body 5a. In the embodiment shown in FIG. 5, the axial length of the main body 5a is the same as that of the window material 4, and in the embodiment shown in FIG. It's a long one.

Furthermore, in the embodiment shown in FIG. 7, the sealing film 5 is formed into a cylindrical shape with both end faces closed, and the window member 4 is disposed within this cylindrical main body 5a.

Here, the sealing film 5 covering such a window material 4 is as follows.

It can be formed by dipping the window material 4 in a solution in which the sealing film component is dissolved in a solvent and then drying it.The window material coated with the sealing film can be coated with an adhesive or directly clad. It can be attached by placing it in the opening of the cladding material 2 and closing the cladding material 2, followed by adhesion or thermal fusion in the same manner as in the embodiment shown in FIG.

Furthermore, in the embodiment shown in FIG. 8, an adhesive or heat-fusible sheet 6 is laminated in advance on the outer peripheral surface of one end of the cladding material 2, and a sealing film 5 as shown in FIG. 1 is provided on this. In the examples shown in FIGS. 9 and 10, a heat shrink tube 7 is provided to cover the cylindrical joint 5c of the sealing film 5 in the example shown in FIG. Fig. 9 shows an example in which the heat-shrinkable tube 7 has a single-layer structure, and Fig. 10 shows an example in which the heat-shrinkable tube 7 is laminated with an inner layer 7a that is easily bonded or heat-shrinkable and an outer layer 7b that provides a high shrinkage force at the bonding or heat-sealing temperature. This is an example formed into a structure.

Furthermore, in the embodiments shown in FIGS. 11 to 15, the sealing film 5 is interposed between the cladding material 2 and the window material 4 in the embodiments shown in FIGS. 1 to 10. The sealing film 5 is not interposed between the cladding material 2 and the window material 4, and direct contact of the liquid core material 3 with the sealing film 5 is eliminated.

That is, in the embodiment shown in FIG. 11, the sealing film 5 is formed into a disk-shaped main body 5d.
It has a structure in which a cylindrical joint part 5c is integrally provided on the outer peripheral edge of the inner surface of the body, and in this example, the inner peripheral edge of the disc-shaped upper body 5d and one part of the cladding material 2. Either or both of the end face and the inner circumferential surface of the cylindrical joint portion 5c and the outer circumferential surface of the cladding material 2 are bonded or thermally fused. 12 and 13 show the sealing film 5 as a disk-shaped main body 5.
d, and one end surface of the cladding material 2 and the sealing film 5 are bonded together. In this case, in the embodiment shown in FIG. 13, an adhesive or heat-fusible sheet 6 is laminated on the outer periphery of one end of the cladding material 2, thereby increasing the bonding area on the cladding material 2 side. The embodiment shown in FIG. 14 has the same structure as the sealing film 5 of the embodiment shown in FIG. 3, and the embodiment shown in FIG. 15 has the same structure as the sealing film 5 of the embodiment shown in FIG. The cylindrical main body 5a of the sealing film 5 is inserted into one end of the cladding material 2 while the material 3 is directly and deeply inserted into one end of the cladding material 2.

Figures 16 to 23 show other embodiments of the present invention, in which a sealing plug is used in addition to or in place of the sealing membrane described above.

That is, the embodiment shown in FIG. 16 uses a sealing member 9 in which a cylindrical sealing film 5 is integrally provided on the outer peripheral edge of the inner surface of a disc-shaped or cylindrical sealing plug 8.

A sealing plug 8 is disposed in contact with one end surface of the cladding material 2, and the inner circumferential surface of the sealing film 5 and the outer circumferential surface of the cladding material 2 are bonded or heat-sealed. In this case, if necessary, the inner peripheral end of the sealing plug 8 and one end surface of the cladding material 2 are bonded or heat-sealed, but the joining of the sealing plug 8 and the window material 4 is not necessarily required.

In addition, in the embodiment of FIG. 16, as shown in FIGS. 17 and 18, respectively, FIGS.
A heat shrinkable tube 7 as described in the figures can be provided.

By arranging the sealing plug 8 in this manner, the selection range of shape and material τ can be expanded, and resistance to external force can be improved. In this case, various functions such as a lens function, an optical filter function, a heat filter function, etc. can be added to the sealing plug 8 if necessary.

In addition to the materials used for the sealing film mentioned above and those containing dyes, the material for the sealing plug 8 may be materials commonly used as optical window materials, such as melted materials. Quartz, borate glass, flint glass, crown glass, soda glass, chalcogenide glass, fluoride glass, lithium fluoride, sodium fluoride, calcium fluoride,
Barium fluoride, sodium chloride, calcium chloride, potassium chloride, thallium bromide, potassium iodide, K RS-5
, KR8-6, sapphire, crystal, magnesia, titania, alumina, silicon, germanium, polystyrene, A
58 polymerization i, ABs copolymer, styrene-maleic acid resin, metal methacrylate-1-styrene copolymer resin,
Styrene-maleic anhydride + M 1m, metal methacrylate-styrene copolymer resin, styrene-maleic anhydride resin, methacrylic resin, cellulose acetate,
polyester carbonate, polyester, polymethylpentene, polyarylate, polyether sulfone,
Single and multi-layered materials such as polyether ether ketone, polycarbonate t-, nylon, polysulfone and the like are exemplified.

In addition, in the sealing member 9 formed by integrating the sealing plug 8 and the sealing film 5 described above, the sealing plug 8 and the sealing film 5 may be made of the same material or different materials. Good too.

In the embodiment shown in FIG. 19, a disc-shaped or cylindrical sealing plug 8 is inserted into one end of the cladding material 2.

In the embodiment shown in FIG. 20, which is an example in which the outer circumferential surface of the sealing plug 8 and the inner circumferential surface of the cladding material 2 are bonded, there is no space between the sealing plug 8 and the cladding material 2 in the arrangement shown in FIG. An example in which the sealing film 5 is interposed and the sealing film 5 and the cladding material 2 are bonded (in this case,
Adhesion or thermal fusion of the sealing plug 8 and the sealing film 5 is not necessarily required).

In the embodiment shown in FIG. 21, a sealing plug 8 is disposed in contact with one end surface of a cladding material 2, and a sealing film 5 consisting of a disc-shaped main body 5d and a cylindrical joint part 5c is used to close the sealing plug 8. In the example in which the outer surface and outer peripheral surface are covered, the inner peripheral surface of the joint portion 5C of the sealing film 5 and the outer peripheral surface of the cladding material 2 are bonded or heat-sealed, but the sealing plug 8
and the sealing film 5 do not necessarily need to be bonded to each other. Furthermore, the embodiment of FIG. 22 has a sealing plug 8 similar to the embodiment of FIG. 21.
In the arrangement, a heat-shrinkable tube 7 as shown in FIGS. 9 and 10 is used to join the inner circumferential surface of the tube to the outer circumferential surface of the cladding material 2 and the outer circumferential surface of the sealing plug 8. Also, the second
The embodiment shown in FIG. 3 is different from the embodiment shown in FIG.
A sealing film 5 is interposed between the heat-shrinkable tube and the heat-shrinkable tube.

Among the embodiments described above, in the embodiments shown in FIGS. 11 to 23, the sealing film 5 and the sealing plug 8 are not in direct contact with the liquid core material 3, so the material thereof is not necessarily the same as the core material 3. There is no need to consider solvent resistance.

Furthermore, among the embodiments described above, in the embodiments shown in FIGS. 11 to 15 and the embodiments shown in FIGS. 20 to 23, the sealing film 5 is not necessarily formed into a film shape in advance. A solution prepared by dissolving a material capable of forming the sealing film 5 described above using a solvent, and various transparent paints and adhesives 1, for example, fluororesin-based, silicon-based, epoxy-based, and phenol-based.

Urethane type, diene type, butyral type, formal type,
One or two types of polyester, polyamide, polyamide-imide, cellulose, polyimide, polyolefin, polyacrylate, ionomer, cyanoacrylate, DAP resin, melamine resin, urine J resin, etc. The sealing film 5 can also be a surface coat film formed by applying or dipping a paint or adhesive made of the above mixture onto a necessary end portion of the optical transmission hose.

Although the above description describes preferred embodiments of the present invention, the present invention is not limited to the above embodiments, and the configuration of the present invention may be modified in various ways without departing from the gist thereof. obtain.

Hereinafter, the effects of the present invention will be specifically illustrated by experimental examples.

[Experiment example]

As shown in Fig. 24, the inner diameter is 5φ, the outer diameter is 6φ, and the length is 3φ.
After filling liquid paraffin (core material 3) into a circular chew (clad material 2) of tetrafluoroethylene-hexafluoropropylene copolymer (refractive index n = 1.338) of
Both ends of the tube were sealed with 3011II11 quartz ronds (window material 4), and on top of that, inner diameter 6φ and outer diameter 7
A cap (sealing film 5) made of tetrafluoroethylene-hexafluoropropylene copolymer having a diameter of 30+na+ was placed on the cap, and then wound up with a wire 10 and heat-sealed for 10 minutes.

Note that a micro burner was used for heating. For the purpose of confirming the end sealing ability of this optical transmission hose,
Although it was left in an oven at 0°C for 100 hours, no further damage was observed.

For comparison, both ends of a circular tube were sealed with iron rods made of stone, and then both ends were rolled up with wire without using a gear or knob. When this product was left in an oven at 100° C. for 100 hours, a space was found in the transmission medium.

In addition, the optical transmission hose of the present invention has a cylindrical cladding material filled with a liquid core material having a higher refractive index than the cladding material,
In the solution-type optical transmission hose in which a window material is provided by closing the openings at both ends of the cladding material, a sealing film or a sealing plug covering both ends and openings of the cladding material is provided at both ends of the cladding material. By liquid-tightly joining each to the core material, leakage of the liquid core material is reliably prevented even if exposed to a high temperature atmosphere for a long period of time.

[Brief explanation of the drawing]

1 to 24 are partially omitted cross-sectional views showing embodiments of the present invention, and FIG. 25 is a partially omitted cross-sectional view of a conventional example. 1... Optical transmission hose, 2... Clad material, 3...
Core material, 4... Window material, 5... Sealing film, 8... Sealing plug. Applicant Brideston Co., Ltd. Agent Patent Attorney Takashi Kojima 5a 5a
'io G. Q! ;0 / u P / b5 Q Charming (v-7・

Claims (1)

[Claims] 1. A solution type optical transmission in which a liquid core material having a higher refractive index than the cladding material is filled inside a cylindrical cladding material, and a window material is provided by closing the openings at both ends of the cladding material. 1. An optical transmission hose, characterized in that a sealing film or a sealing plug that covers both end openings of the cladding material is liquid-tightly joined to both ends of the cladding material.