CA1170089A - Infrared light transmitting fiber - Google Patents
Infrared light transmitting fiberInfo
- Publication number
- CA1170089A CA1170089A CA000378476A CA378476A CA1170089A CA 1170089 A CA1170089 A CA 1170089A CA 000378476 A CA000378476 A CA 000378476A CA 378476 A CA378476 A CA 378476A CA 1170089 A CA1170089 A CA 1170089A
- Authority
- CA
- Canada
- Prior art keywords
- metal
- infrared light
- fiber
- coating
- light transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An infrared light transmission fiber is disclosed which comprises a fibrous metal halide infrared light transmission path covered sequentially with a resin coating and a metal coating.
An infrared light transmission fiber is disclosed which comprises a fibrous metal halide infrared light transmission path covered sequentially with a resin coating and a metal coating.
Description
- 3 ~7(~1)89 INFRARED LIGHT TRANSMITTING FIBER
FIELD OF THE INVENTION
This invention relatcs to the structure of an infrared light transmitting fiber composed of a metal halide.
BACKGROUND OF THE INVENTION
Fibers made of oxide glass such as quartz glass are currently used in optical communication, but they have a great transmission loss in the infrared spectrum and are not suitable for use in transmitting infrared light rays. Alkali metal halides, alkaline earth metal halides, silver halides, and thallium halides are known as materials that transmit infrared light rays. But thallium halide and silver halide are sensitive to ultraviolet and visible rays to cause increased trans-mission loss, whereas alkali metal- halides are highly hydro--scopic and their surface is easlly deteriorated;to cause increased transmisslon loss or reduce their mechanical strength.
SU~IMARY OF THE INVENTION
_ Thereore, one object` of this invention is to provide an easy-to-handle and durable infrared light transmisslan fiber that shields the central infrared light transmitting path from~
external atmosphere and light ~to prevent the deterioration of~
the opticaI and mechanical characteristics of the path due to moisture, visible and ultraviolet rays, as well as to protect the path from external~mechanical forces.
~: , 7()~89 This object of the invention is achieved by an infrared light transmission fiber wherein the central infrared light transmitting path composed of an in-frared light trans-mitting material is covered with a resin layer in contact with said infrared light transmitting material and said resin layer is further covered with a metal layer.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a cross section of an infrared light transmitting fiber and it schematically represents the sequence of producing an infrared light transmitting fiber in Examples 1 and 2; and Figure 2 is a cross section of an extruding machine used for preparing a light transmitting section of metal halide.
DETAILED DESCRIPTION OF THE INVENTION
A fibrous infrared light ~ransmitting path made of metal halide having a primary resin coating and a secondary metal coating has increased reslstance to impacts and other e~ternal forces as compared with an uncoated transmission path.
~letal halides have a higher thermal expansion coefficient than metals and it has been difficult to form a metal coating on them directly, but according to this invention, a metal halide fiber is first coated with a resin layer and hence can be ' provided with a metal coating consistently. The combined effect of the resin and metal layers formed on the metal halide fiber is satisfa~tory even lf only one resin layer and :
:. :
7~
one metal layer are used, but a better result is obtained by using a plurality of resin and metal layers. When more than one resin and metal layers are used, they need not be made of the same material and different resins or metals may be used depending on the case.
Figure 1 is a cross section that schematically represents the sequence of producing an infrared light transmitting fiber in Examples 1 and 2. The optical fiber shown in Figure 1 comprises a light transmitting path of step index type wherein a core 1 has a higher refractive index to infrared rays than a cladding 2 to confine light rays in the core. The path is prepared by hot extrusion and subsequently covered with a primary coating and a secondary coating. A suitable combination of alkali metal halides that provide different refractive indices is sodium chloride ~for the core 1) and potasslum chloride Cfor the cladding 2~, potassium chloride and potassium bromide9 or cesium iodide and cesium bromide;
a suitable combination of sllver halides~is silver bromide and silver chloride; and a suitable combination of thallium halldes is KRS-5;and KRS-6, or KRS-5 and thallium bromide. The silver halides and thallium halides are preferred materials since they have a high flexibllity in a single ~crystal or mixed crystals.
. ~ ` :
` '.
`~
' ~ ' ' . ` , ' ' `
~ 7(~
Figure 2 depicts an extrusion machine for use in preparing the light transmission section of Figure 1.
An extrudable billet made of the core 1 and cladding 2 is charged into a container 11 which is heated with an oven 14. An extruding punch 13 is advanced ~oward a die 12 in an axial direction to force the billet through the die 12 to form a fibrous light transmitting path. The die orifice is designed to pro~ide a fibrous light transmitting path having a diameter of 0.2 to 0.8 mm.
The metal halide fiber is covered with a primary coating 3 which is preferably a highly corrosion-resistant resin such as tetrafluoride resin, siliconé resin, epoxy resin or cyanoacrylate resin, e.g., methyl or~ethyl 2-cyanoacrylate resin. The resin-coating~ls formed by coating and baking or extrusion coating. The resin coatlng is then cov0red with a secondary metal coating 4 which shields the fiber ~rom water and light and increases its mechanical :
strength. Since the resin~forming the primary coatlng has a low melting point, a low crystallizing point and~
other factors where the resin lS detérlorated are ~low temperatures, the metal coating is preferably formed by vacuum deposition;, lon platlng OT sputte~rlng that is effective~for~providing a dense metal layer having uniform~bond strength.
.
'.
' ~7~
The secondary coating is suitably made of a metal that is corrosion-resistant in atmosphere and provides good adhesion ~o t~e resin, and examples of such metal are iron, nickel, chromium, aluminum, copper and their alloys. A low-melting metal such as lead and a low-melting alloy such as lead-tin can be directly extruded over the resin layer. Also, the metal layer can be provided on the resin coating by the metal tape formation or the metal pipe fitting.
This invention is now described in greater detail by reference to the following examples which are given here for illustrative purposes only and are by no means intended to limit the scope of the invention.
EXAMPLE
A cylinder~of ground potassium bromide crystal was fitted into a hollow cylinder of potasslum chloride crystal to form an extrudable billet. The billet was hot extruded through an extruding machine (as shown in Pigure 2) at a temperature between 500 and 600C~to make Z0 a light transmission path 0.5 mm in diameter that was composed~of a core and a cladding both made of a metal halide but having di~ferent refractive indices. The light transmitting path was covered with a primary coating ~ .
of ~ethyl 2-cyanoacrylate resin 0.5 mm thick which was :~
further covere~d with a secondary coating of chromium ~ 5 ` ' ` ' `' ' ~, ~ ~L7(~8~3 10 ~m thick by vacuum deposition. To enhance the combined effect of resin and metal coatings, an epoxy resin coating 0.5 mm thick was applied and baked onto the chromium coating to provide an infrared light transmitting fiber having an overall diameter of about
FIELD OF THE INVENTION
This invention relatcs to the structure of an infrared light transmitting fiber composed of a metal halide.
BACKGROUND OF THE INVENTION
Fibers made of oxide glass such as quartz glass are currently used in optical communication, but they have a great transmission loss in the infrared spectrum and are not suitable for use in transmitting infrared light rays. Alkali metal halides, alkaline earth metal halides, silver halides, and thallium halides are known as materials that transmit infrared light rays. But thallium halide and silver halide are sensitive to ultraviolet and visible rays to cause increased trans-mission loss, whereas alkali metal- halides are highly hydro--scopic and their surface is easlly deteriorated;to cause increased transmisslon loss or reduce their mechanical strength.
SU~IMARY OF THE INVENTION
_ Thereore, one object` of this invention is to provide an easy-to-handle and durable infrared light transmisslan fiber that shields the central infrared light transmitting path from~
external atmosphere and light ~to prevent the deterioration of~
the opticaI and mechanical characteristics of the path due to moisture, visible and ultraviolet rays, as well as to protect the path from external~mechanical forces.
~: , 7()~89 This object of the invention is achieved by an infrared light transmission fiber wherein the central infrared light transmitting path composed of an in-frared light trans-mitting material is covered with a resin layer in contact with said infrared light transmitting material and said resin layer is further covered with a metal layer.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a cross section of an infrared light transmitting fiber and it schematically represents the sequence of producing an infrared light transmitting fiber in Examples 1 and 2; and Figure 2 is a cross section of an extruding machine used for preparing a light transmitting section of metal halide.
DETAILED DESCRIPTION OF THE INVENTION
A fibrous infrared light ~ransmitting path made of metal halide having a primary resin coating and a secondary metal coating has increased reslstance to impacts and other e~ternal forces as compared with an uncoated transmission path.
~letal halides have a higher thermal expansion coefficient than metals and it has been difficult to form a metal coating on them directly, but according to this invention, a metal halide fiber is first coated with a resin layer and hence can be ' provided with a metal coating consistently. The combined effect of the resin and metal layers formed on the metal halide fiber is satisfa~tory even lf only one resin layer and :
:. :
7~
one metal layer are used, but a better result is obtained by using a plurality of resin and metal layers. When more than one resin and metal layers are used, they need not be made of the same material and different resins or metals may be used depending on the case.
Figure 1 is a cross section that schematically represents the sequence of producing an infrared light transmitting fiber in Examples 1 and 2. The optical fiber shown in Figure 1 comprises a light transmitting path of step index type wherein a core 1 has a higher refractive index to infrared rays than a cladding 2 to confine light rays in the core. The path is prepared by hot extrusion and subsequently covered with a primary coating and a secondary coating. A suitable combination of alkali metal halides that provide different refractive indices is sodium chloride ~for the core 1) and potasslum chloride Cfor the cladding 2~, potassium chloride and potassium bromide9 or cesium iodide and cesium bromide;
a suitable combination of sllver halides~is silver bromide and silver chloride; and a suitable combination of thallium halldes is KRS-5;and KRS-6, or KRS-5 and thallium bromide. The silver halides and thallium halides are preferred materials since they have a high flexibllity in a single ~crystal or mixed crystals.
. ~ ` :
` '.
`~
' ~ ' ' . ` , ' ' `
~ 7(~
Figure 2 depicts an extrusion machine for use in preparing the light transmission section of Figure 1.
An extrudable billet made of the core 1 and cladding 2 is charged into a container 11 which is heated with an oven 14. An extruding punch 13 is advanced ~oward a die 12 in an axial direction to force the billet through the die 12 to form a fibrous light transmitting path. The die orifice is designed to pro~ide a fibrous light transmitting path having a diameter of 0.2 to 0.8 mm.
The metal halide fiber is covered with a primary coating 3 which is preferably a highly corrosion-resistant resin such as tetrafluoride resin, siliconé resin, epoxy resin or cyanoacrylate resin, e.g., methyl or~ethyl 2-cyanoacrylate resin. The resin-coating~ls formed by coating and baking or extrusion coating. The resin coatlng is then cov0red with a secondary metal coating 4 which shields the fiber ~rom water and light and increases its mechanical :
strength. Since the resin~forming the primary coatlng has a low melting point, a low crystallizing point and~
other factors where the resin lS detérlorated are ~low temperatures, the metal coating is preferably formed by vacuum deposition;, lon platlng OT sputte~rlng that is effective~for~providing a dense metal layer having uniform~bond strength.
.
'.
' ~7~
The secondary coating is suitably made of a metal that is corrosion-resistant in atmosphere and provides good adhesion ~o t~e resin, and examples of such metal are iron, nickel, chromium, aluminum, copper and their alloys. A low-melting metal such as lead and a low-melting alloy such as lead-tin can be directly extruded over the resin layer. Also, the metal layer can be provided on the resin coating by the metal tape formation or the metal pipe fitting.
This invention is now described in greater detail by reference to the following examples which are given here for illustrative purposes only and are by no means intended to limit the scope of the invention.
EXAMPLE
A cylinder~of ground potassium bromide crystal was fitted into a hollow cylinder of potasslum chloride crystal to form an extrudable billet. The billet was hot extruded through an extruding machine (as shown in Pigure 2) at a temperature between 500 and 600C~to make Z0 a light transmission path 0.5 mm in diameter that was composed~of a core and a cladding both made of a metal halide but having di~ferent refractive indices. The light transmitting path was covered with a primary coating ~ .
of ~ethyl 2-cyanoacrylate resin 0.5 mm thick which was :~
further covere~d with a secondary coating of chromium ~ 5 ` ' ` ' `' ' ~, ~ ~L7(~8~3 10 ~m thick by vacuum deposition. To enhance the combined effect of resin and metal coatings, an epoxy resin coating 0.5 mm thick was applied and baked onto the chromium coating to provide an infrared light transmitting fiber having an overall diameter of about
2.5 mm.
EXAMPL~l 2 A c)linder of ground silver bromide crystal was fitted into a hollow cylinder of silver chloride crystal to form an extrudable billet. The billet was hot extruded through an extruding machine ~~as shown in Figure 2) at a temperature between 180 and 350C to make a light transmission path 0.5 mm ln diameter that was composed of a core and a cladding both made of a metal halide but having different refractive indices. The light transmitting path was covered with a primary coating of methyl 2-cyanoacrylate resin coating which was further covered with a secondary coating of~chromium 10 ~m thick by vacuum deposition. The preparation of the silver halide crystalsj their extrusion and the coating of light-shielding layer were carrled out~in a dark room using a red safety lamp to prevent the crystals and light-transmissi;on path from bein~g sensitized with ultraviolet or visible rays. To enhance the combined effect of resin and metal coat~ings,~an epoxy resin : ~ :
... . ... .. . .. ... . ..
~ ~7(~O ~
coating 0.5 mm thick was applied and baked onto the chromium coating to provide an infrared light transmit-ting fiber having an outer diameter of about 2.5 mm.
A test was conduçted to evaluate the optical and mechanical characteristics of the infrared light transmitting fibers prepared in Examples 1 and 2. The infrared light transmitting fiber prepared in Example 1 that comprised a light transmlssion path made of potassium bTomide and potassium chloride and which was covered sequentially with a cyanoacrylate coating, a chromium coating and an epoxy resin coating, as well as a ligh* transmission path made of potassium bromide and potassium chloride having no ~esin or metal çoating were left to stand in an indoor laboratory for one month.
The sample of Example 1 was found to have experienced no change in the transmission loss of CO2 laser beams and the break strength even after standing for one month.
The control sample right after its preparation had the same optical character~istics as the sample oE Example 1, -but upon standing for one month~, it became so brittle th~at it could not be mounted ln~an in~strument for measuring~the transmission loss of CO2 laser beams or a tensile~tester.
; ~ ~The m frared~light-transmlttlng fiber prepaTed in Example 2 that;comprise~d a~1ight transmission path made of silver bromide ~and silver~chloride and~which was ~ 9 sequentially covered with a cyanoacrylate resin coating, a chromium coating and an epoxy resin coating, as well as a light transmission path made of silver bromide and silver chloride having no resin or metal coating were left to stand in an indoor laboratory for one month.
The sample of Example 1 was found to have experienced no change in the transmission loss of C02 laser beams and the break strength even after standing for one month.
The break strength of the control sample did not change even after standing for one month, but its surface turned black and upon irradiation with C0~ laser beams at 2 W, the beam spot emitted red light and the surface began to melt.
As described in the foregoing, by covering a fibrous metal halide light transmission path with a primary resin coating and a secondary metal coat;ng, a stable infrared light transmission fiber is obtained wherein the light transmission path is protected against deterioration of its optical and mechanical characteris-tics due to moisture and visible and ultraviolet raysand has increased mechanical strength. Such infrared light transmission fiber can be used to connect infrared light rays to a remote photosensor or can be used to direct C0 or C02 laser beams to a heating or working machine in a remote or inaccessible site.
' '`
' .
~:~ 7(.~ 8~
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
:
.
- ::
., ' ~ ~ g ~
.
" ~l7~)~)8~
1 SUPPI,EMENTARY DISCLOSURE
In the principal disclosure, the inventors have disclosed several me-thods for forming the metal coating on the surface of the resin coated fiber. ~urther and more particular details will now be given illustrating the metal tape formation and the metal pipe fitting methods.
BRIEF DESCR;IPTION OF THE DRAWINGS
Figures3, 3a and 3b represent schematic drawings il-lustrating the steps of the meta~ tape formation method.
Figure ~ represents a sectionaI view of the fibre and metal pipe passing through a die, illustrating one embodiment of the metal pipe fitting method.
Figures5a,Sb and 5c are schematic drawings illustrat-ing the steps of a second embodiment of the metal pipe fitting me-thod.
DETAILED DESCRIPTION OF THE INVENTION
As stated hereinbefore, the metal coating may be formed on the surface of the resin coated fiber using one of several different methods.
One of such methods involves the winding of a metal tape around the outer surface of the resin coated fiber, to form a metal pipe. The tape may be made of any suitable material and preferably, is made of aluminum, copper or lead and has a thickness of about 0.01 mm to about 0.2 mm and a width of about 5mm to about 20 mm. It is wound spirally about the outer surface of the fiber.
The metal tape may also, if desired, be roll-molded in a pipe form around the outer surface of the resin coated fiber.
Figure 3 illustrates the steps of this process in a simplified manner. The fiber comprising the core 1 and the primary coating 3, 1 and the tape 4, are placed in a roll-molding machine which has a plurality of pairs of rolls 5 which bend or roll the tape 4 to the desired shape. The rolls may have any desired radius curvature. In the product of (a) of figure 3, the tape 4 is rolled such that its ends are contiyuous. In the product of (b) of figure 3, the tape is partially overlapping.
In yet a further embodiment, the metal coating can be formed by inserting the resin coated fiber loosely into a previously formed pipe which has an inside diameter slightly greater than the outer diameter of the resin coated fiber.
The pipe, preferably made of aluminum, copper or lead, is then subjected to reduction of its diameter so that the metal pipe ~its around the outer surface of the resin coated fiber.
This may be achieved by several methods. One of such methods is shown in figure 4 which shows the metal pipe 10 and the resin coated fiber 12 being drawn through a die 14 in the direction of the arrow. As the fiber emerges from the die 14, the diameter of the pipe 10 is reduced so that the pipe 10 fits around the fiber 12.
~ A second of such methods is illustrated in figures Sa to 5c which sh~w the resin coated fiber`bein~ placed inside of a metal pipe 10 in part (a). As seen in this figure, the pipe 10 has an inner diameter which is greater than the outer diameter of the fiber 12. As shown ln part (b), the metal tube 10 is then subjected to diame-ter reduction by crimping or pinching off the excess material such that the metal tube is now contiquous with the coated fiber. The next step as shown in figure S(c) is to bend the flap or excess material of the pipe around the outer surface of the metal pipe.
The foregoing examples are given for illustrative purposes only and are not intended to limit the scope of the invention.
, .,
EXAMPL~l 2 A c)linder of ground silver bromide crystal was fitted into a hollow cylinder of silver chloride crystal to form an extrudable billet. The billet was hot extruded through an extruding machine ~~as shown in Figure 2) at a temperature between 180 and 350C to make a light transmission path 0.5 mm ln diameter that was composed of a core and a cladding both made of a metal halide but having different refractive indices. The light transmitting path was covered with a primary coating of methyl 2-cyanoacrylate resin coating which was further covered with a secondary coating of~chromium 10 ~m thick by vacuum deposition. The preparation of the silver halide crystalsj their extrusion and the coating of light-shielding layer were carrled out~in a dark room using a red safety lamp to prevent the crystals and light-transmissi;on path from bein~g sensitized with ultraviolet or visible rays. To enhance the combined effect of resin and metal coat~ings,~an epoxy resin : ~ :
... . ... .. . .. ... . ..
~ ~7(~O ~
coating 0.5 mm thick was applied and baked onto the chromium coating to provide an infrared light transmit-ting fiber having an outer diameter of about 2.5 mm.
A test was conduçted to evaluate the optical and mechanical characteristics of the infrared light transmitting fibers prepared in Examples 1 and 2. The infrared light transmitting fiber prepared in Example 1 that comprised a light transmlssion path made of potassium bTomide and potassium chloride and which was covered sequentially with a cyanoacrylate coating, a chromium coating and an epoxy resin coating, as well as a ligh* transmission path made of potassium bromide and potassium chloride having no ~esin or metal çoating were left to stand in an indoor laboratory for one month.
The sample of Example 1 was found to have experienced no change in the transmission loss of CO2 laser beams and the break strength even after standing for one month.
The control sample right after its preparation had the same optical character~istics as the sample oE Example 1, -but upon standing for one month~, it became so brittle th~at it could not be mounted ln~an in~strument for measuring~the transmission loss of CO2 laser beams or a tensile~tester.
; ~ ~The m frared~light-transmlttlng fiber prepaTed in Example 2 that;comprise~d a~1ight transmission path made of silver bromide ~and silver~chloride and~which was ~ 9 sequentially covered with a cyanoacrylate resin coating, a chromium coating and an epoxy resin coating, as well as a light transmission path made of silver bromide and silver chloride having no resin or metal coating were left to stand in an indoor laboratory for one month.
The sample of Example 1 was found to have experienced no change in the transmission loss of C02 laser beams and the break strength even after standing for one month.
The break strength of the control sample did not change even after standing for one month, but its surface turned black and upon irradiation with C0~ laser beams at 2 W, the beam spot emitted red light and the surface began to melt.
As described in the foregoing, by covering a fibrous metal halide light transmission path with a primary resin coating and a secondary metal coat;ng, a stable infrared light transmission fiber is obtained wherein the light transmission path is protected against deterioration of its optical and mechanical characteris-tics due to moisture and visible and ultraviolet raysand has increased mechanical strength. Such infrared light transmission fiber can be used to connect infrared light rays to a remote photosensor or can be used to direct C0 or C02 laser beams to a heating or working machine in a remote or inaccessible site.
' '`
' .
~:~ 7(.~ 8~
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
:
.
- ::
., ' ~ ~ g ~
.
" ~l7~)~)8~
1 SUPPI,EMENTARY DISCLOSURE
In the principal disclosure, the inventors have disclosed several me-thods for forming the metal coating on the surface of the resin coated fiber. ~urther and more particular details will now be given illustrating the metal tape formation and the metal pipe fitting methods.
BRIEF DESCR;IPTION OF THE DRAWINGS
Figures3, 3a and 3b represent schematic drawings il-lustrating the steps of the meta~ tape formation method.
Figure ~ represents a sectionaI view of the fibre and metal pipe passing through a die, illustrating one embodiment of the metal pipe fitting method.
Figures5a,Sb and 5c are schematic drawings illustrat-ing the steps of a second embodiment of the metal pipe fitting me-thod.
DETAILED DESCRIPTION OF THE INVENTION
As stated hereinbefore, the metal coating may be formed on the surface of the resin coated fiber using one of several different methods.
One of such methods involves the winding of a metal tape around the outer surface of the resin coated fiber, to form a metal pipe. The tape may be made of any suitable material and preferably, is made of aluminum, copper or lead and has a thickness of about 0.01 mm to about 0.2 mm and a width of about 5mm to about 20 mm. It is wound spirally about the outer surface of the fiber.
The metal tape may also, if desired, be roll-molded in a pipe form around the outer surface of the resin coated fiber.
Figure 3 illustrates the steps of this process in a simplified manner. The fiber comprising the core 1 and the primary coating 3, 1 and the tape 4, are placed in a roll-molding machine which has a plurality of pairs of rolls 5 which bend or roll the tape 4 to the desired shape. The rolls may have any desired radius curvature. In the product of (a) of figure 3, the tape 4 is rolled such that its ends are contiyuous. In the product of (b) of figure 3, the tape is partially overlapping.
In yet a further embodiment, the metal coating can be formed by inserting the resin coated fiber loosely into a previously formed pipe which has an inside diameter slightly greater than the outer diameter of the resin coated fiber.
The pipe, preferably made of aluminum, copper or lead, is then subjected to reduction of its diameter so that the metal pipe ~its around the outer surface of the resin coated fiber.
This may be achieved by several methods. One of such methods is shown in figure 4 which shows the metal pipe 10 and the resin coated fiber 12 being drawn through a die 14 in the direction of the arrow. As the fiber emerges from the die 14, the diameter of the pipe 10 is reduced so that the pipe 10 fits around the fiber 12.
~ A second of such methods is illustrated in figures Sa to 5c which sh~w the resin coated fiber`bein~ placed inside of a metal pipe 10 in part (a). As seen in this figure, the pipe 10 has an inner diameter which is greater than the outer diameter of the fiber 12. As shown ln part (b), the metal tube 10 is then subjected to diame-ter reduction by crimping or pinching off the excess material such that the metal tube is now contiquous with the coated fiber. The next step as shown in figure S(c) is to bend the flap or excess material of the pipe around the outer surface of the metal pipe.
The foregoing examples are given for illustrative purposes only and are not intended to limit the scope of the invention.
, .,
Claims (6)
1. An infrared light transmission fiber comprising a fibrous metal halide infrared light transmission path covered sequentially with a resin coating and a metal coating,
2. An infrared light transmission fiber as claimed in claim 1 wherein the metal coating is formed by vacuum deposition, ion plating or sputtering.
3. An infrared light transmission fiber as claimed in claim 1 wherein said metal halide is a thallium halide or a silver halide.
CLAIMS SUPPORTED BY THE SUPPLEMENTARY DISCLOSURE
CLAIMS SUPPORTED BY THE SUPPLEMENTARY DISCLOSURE
4. An infrared light transmission fiber as claimed in claim 1 wherein said metal coating is formed by winding a metal tape spirally around the outer surface of the resin coated fiber.
5. An infrared light transmission fiber as claimed in claim 1 wherein said metal coating is formed by roll-molding a metal tape around the outer surface of the resin coated fiber.
6. An infrared light transmission fiber as claimed in claim 1 wherein said metal coating is formed by loosely insert-ing the resin coated fiber into a metal pipe and then reducing the diameter of the metal pipe to fit he metal pipe around the outer surface of the resin coated fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000378476A CA1170089A (en) | 1981-05-27 | 1981-05-27 | Infrared light transmitting fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000378476A CA1170089A (en) | 1981-05-27 | 1981-05-27 | Infrared light transmitting fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1170089A true CA1170089A (en) | 1984-07-03 |
Family
ID=4120082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000378476A Expired CA1170089A (en) | 1981-05-27 | 1981-05-27 | Infrared light transmitting fiber |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1170089A (en) |
-
1981
- 1981-05-27 CA CA000378476A patent/CA1170089A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4397524A (en) | Image-transmitting bundled optical fibers | |
| CA1093357A (en) | Optical waveguide with protective compression coating of metallic glass | |
| US4089585A (en) | Optical guides | |
| US4647153A (en) | Image guide | |
| JPS61250605A (en) | Image fiber with optical waveguide | |
| GB1559630A (en) | Lowloss multilayer optical fibre | |
| EP3475748B1 (en) | Fire retardant optical fiber cable | |
| US11187866B2 (en) | Fiber multitube optical fiber cable | |
| CA1283568C (en) | Crystalline optical fiber and its method of manufacture | |
| JPH0684254B2 (en) | Radiation resistant multiple fibers | |
| EP0261484B1 (en) | Infrared transmitting fibre | |
| CA1051239A (en) | Photoconductive fiber or rod | |
| CA1170089A (en) | Infrared light transmitting fiber | |
| US4764194A (en) | Method of manufacturing hollow core optical fibers | |
| US4375314A (en) | Infrared optical fiber | |
| GB1602052A (en) | Optical fibre manufacture | |
| GB2100464A (en) | An improved optical fibre | |
| EP0068175B1 (en) | Image conducting fiber device | |
| CA1087889A (en) | Optical fiber waveguide with effective refractive index profile | |
| JPS6051083B2 (en) | Optical transmitter for infrared transmission | |
| JPH07128558A (en) | Production of optical fiber | |
| CN208110123U (en) | A kind of composite fire indoor flexible optical cable | |
| JPH08136747A (en) | Production of image fiber with light guide | |
| Hilton Sr | Infrared imaging bundle development at amorphous materials | |
| JPH0755511Y2 (en) | Fiber optic radiation dosimeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |