CA1109306A - Optical fibre connector - Google Patents
Optical fibre connectorInfo
- Publication number
- CA1109306A CA1109306A CA330,305A CA330305A CA1109306A CA 1109306 A CA1109306 A CA 1109306A CA 330305 A CA330305 A CA 330305A CA 1109306 A CA1109306 A CA 1109306A
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- connector
- tube
- fibre optic
- bore
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3887—Anchoring optical cables to connector housings, e.g. strain relief features
- G02B6/3888—Protection from over-extension or over-compression
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A fibre optic connector for receiving and fixedly securing a fibre optic having a core and a coating therearound, comprising : a plastically deformable sleeve having an inner bore which is sized for slidably fitting around an end of a fibre optic, said bore having an inner surface provided with protrusions, said deformable sleeve being made out of a material which is harder than that of the fibre optic coating;
and a tube within which said sleeve may be inserted, said tube being permanently deformable under external compression force for applying pressure to said sleeve inserted therein to drive and maintain said protrusions into the plastic coating of a fibre optic introduced in said bore.
A fibre optic connector for receiving and fixedly securing a fibre optic having a core and a coating therearound, comprising : a plastically deformable sleeve having an inner bore which is sized for slidably fitting around an end of a fibre optic, said bore having an inner surface provided with protrusions, said deformable sleeve being made out of a material which is harder than that of the fibre optic coating;
and a tube within which said sleeve may be inserted, said tube being permanently deformable under external compression force for applying pressure to said sleeve inserted therein to drive and maintain said protrusions into the plastic coating of a fibre optic introduced in said bore.
Description
3'~6 The object o:E the present invention is an optical fibre connector.
It has already been proposed, for its connection, to immobilize an optical fibre provided with a plastics material coating inside a tube device through ribs or Eillets protru~
ding inside a tube which is longitudinally slit, so that when the tube is being tightened on its outer surface, there appears a deformation of the tongs limited by the slits ensuring the penetration of the fillets or similar in -the coa-ting of the fibre.
According to the present invention there is provided a fibre optic connector for receiving and fixedly securing a fibre optic having a core and a coating therearound, comprising : a plasti.cally deformable sleeve having an inner bore which is sized for slidably fitting around an end of a fibre optic, said bore having an inner surface provided with protrusions, said deformable sleeve being made out oE a material which is harder than that of the fibre optic coating; and a tube within which said sleeve may be inserted, said tube being : 20 permanently deformable under external compression force for applying pressure to said sleeve inserted therein to drive and maintain said protrusionsinto the plastic coating of a fibre optic introduced in said bore.
It has been established that by providing~protrusions) fillets or ribs on the inner surface of a tube which is not slit and is relatively deformable, it was possible to ensure the effective immobilization of -the optical fibre provided with its coa-ting by a simple outer tightening operation of the portion of the tube which is opposite the protrusions : the tube becomes deformed in such a manner that not only the fillets are driven into the plastics coating, hut also this embedding remains after -the tightening effort has ceased.
:
~ ' :
3'146 The tightening effortmay be provided by a -tool which is currently available in the industry, for instance so-called tube pliers with two jaws leaving an hexagonal housing in which isplaced the tube for -the tiyhtening operation.
The :Eillets, which advantageously may be in -the form of a tapping or of a threading, may be present on a tube or sleeve of semi-rigid plastics material which is housed inside a metallic tube not sli-t and the wall of which is relatively thin, -the tightening pressure exerted on the metallic tube providing the driving of the protrusions of the sleeve inside the coating of the optical fibre.
It has been established that once the tightening effort has ceased, the formation of the metallic tube, which is permanent, maintains the protrusions firmly anchored in-side the coating of the fibre.
Due to this disposition, one takes advantage not only of the good adaptability of the plastics material forming the sleeve with regards to the outer coating of the fibre, but also it is possible to use metallic tubes with a same diame-ter for the fixation of fibers of different diameters, the adaptation to the various diameters of the fibres being possible by an appropriate choice of the thickness of the sleeve wall, said sleeve forming for example part of a se-t of sleeves.
The user, instead of being compelled to have available as many types of metallic tubes as there are types of optical fibres to be assembled, can use the same type of tube, with the benefit of a simplification of supplies and s-torage.
The following description, which is given by wa~ of example, refers to the accompanying drawings wherein :
Figure 1 is a cross-sectional view of a metallic tube de~ice ;
3~
Figure 2 is an axial cross-sectional view of a sleeve;
Figure 3 shows in axial cross-section the constitu--tion of an op-tical fibre;
Figure 4 shows -the optical fibre after assembly with the tube; and Figure 5 is a view simila:r to that of Figure 4, but for an optical fibre of larger diameter than that of the fibre shown in Figure 4.
A metallic tube device 41 (Figure 1) which has to be fixed on an optical fibre for its connection therewi-th, comprises a body 42 extending into a skirt relativel~ -thin, the thickness of its wall being of the order of a :Eew tenths of a millimetre. For the assembly with an optical fibre, one starts by introducing in the skirt 43 a sleeve 44 (Figure 2), made of a semi-rigid plastics material, advantageously in polyamide of the nylon or rilsan>~ * (* a trade mark of Rhône-Polenc, a French Corporation, designating a Polyamid-12 molecular compound) type, which comprises a cylindrical body 45 with, at one end, a flange 46 of outer diameter larger than that of the body 45. The inner surface of the sleeve is formed with protrusions, such as for example those formed by a tapping 47.
The sleeve 44 is chosen such that the thickness of its wall 48 allows the introduction with a snug fit inside channel 49 which it provides, of the optical fibre 51 (Fig.3) formed for example of a core in silica glass 52 and a coating 53 comprising for example an ou-ter layer 54 for the protection, for example in Tefzel (registered trade-mark of Du Pont de Nemours) and a plastics optical layer or sleeve 55 having a refractive index lower than that of the glass.
After the introduction, a crimping operation is carried out by tightening the skirt 43 with pliers, the jaws ~7 - 3 -, 3~
of which for example delimit an hexagonal housing.
The tighteniny effort is transmi-ttecl by the skirt 43 which is deformed to the body 45 of sleeve 44, and the helical protrusion formed by the tapping 47 drives into the coatiny 54, without however passinq completely through it.
When the tightening effort is released, the skirt 43, which is permanently deformed, maintains in the position reached the body 45 of the sleeve, and the crimping remains.
For an assembly with an optical fibre of larger diameter, one uses a metallic tube 41 of same gauge, but which one provides with a sleeve 44' the wall 48' of body 45' having a smaller thickness, as is shown in Figure 5.
On the contrary, for an assembly with an optical fibre of smaller diameter, one uses a sleeve wi-th a thicker wall.
The risks of damage to the coating of the optical fibre are reduced relative to a crimping operation which is carried out with a tapping formed on a metallic wall.
In addition, the crimping effect is better distri-buted : it appears practically on the whole of the peripheryof the fibre, in spite of the polygonal shape of the crimping pliers.
Good results are obtained with tightening pressures varying within wide limits, so that i-t is not necessary to 9 set regulations of high precision for the tightening effort.
~ , : : '
It has already been proposed, for its connection, to immobilize an optical fibre provided with a plastics material coating inside a tube device through ribs or Eillets protru~
ding inside a tube which is longitudinally slit, so that when the tube is being tightened on its outer surface, there appears a deformation of the tongs limited by the slits ensuring the penetration of the fillets or similar in -the coa-ting of the fibre.
According to the present invention there is provided a fibre optic connector for receiving and fixedly securing a fibre optic having a core and a coating therearound, comprising : a plasti.cally deformable sleeve having an inner bore which is sized for slidably fitting around an end of a fibre optic, said bore having an inner surface provided with protrusions, said deformable sleeve being made out oE a material which is harder than that of the fibre optic coating; and a tube within which said sleeve may be inserted, said tube being : 20 permanently deformable under external compression force for applying pressure to said sleeve inserted therein to drive and maintain said protrusionsinto the plastic coating of a fibre optic introduced in said bore.
It has been established that by providing~protrusions) fillets or ribs on the inner surface of a tube which is not slit and is relatively deformable, it was possible to ensure the effective immobilization of -the optical fibre provided with its coa-ting by a simple outer tightening operation of the portion of the tube which is opposite the protrusions : the tube becomes deformed in such a manner that not only the fillets are driven into the plastics coating, hut also this embedding remains after -the tightening effort has ceased.
:
~ ' :
3'146 The tightening effortmay be provided by a -tool which is currently available in the industry, for instance so-called tube pliers with two jaws leaving an hexagonal housing in which isplaced the tube for -the tiyhtening operation.
The :Eillets, which advantageously may be in -the form of a tapping or of a threading, may be present on a tube or sleeve of semi-rigid plastics material which is housed inside a metallic tube not sli-t and the wall of which is relatively thin, -the tightening pressure exerted on the metallic tube providing the driving of the protrusions of the sleeve inside the coating of the optical fibre.
It has been established that once the tightening effort has ceased, the formation of the metallic tube, which is permanent, maintains the protrusions firmly anchored in-side the coating of the fibre.
Due to this disposition, one takes advantage not only of the good adaptability of the plastics material forming the sleeve with regards to the outer coating of the fibre, but also it is possible to use metallic tubes with a same diame-ter for the fixation of fibers of different diameters, the adaptation to the various diameters of the fibres being possible by an appropriate choice of the thickness of the sleeve wall, said sleeve forming for example part of a se-t of sleeves.
The user, instead of being compelled to have available as many types of metallic tubes as there are types of optical fibres to be assembled, can use the same type of tube, with the benefit of a simplification of supplies and s-torage.
The following description, which is given by wa~ of example, refers to the accompanying drawings wherein :
Figure 1 is a cross-sectional view of a metallic tube de~ice ;
3~
Figure 2 is an axial cross-sectional view of a sleeve;
Figure 3 shows in axial cross-section the constitu--tion of an op-tical fibre;
Figure 4 shows -the optical fibre after assembly with the tube; and Figure 5 is a view simila:r to that of Figure 4, but for an optical fibre of larger diameter than that of the fibre shown in Figure 4.
A metallic tube device 41 (Figure 1) which has to be fixed on an optical fibre for its connection therewi-th, comprises a body 42 extending into a skirt relativel~ -thin, the thickness of its wall being of the order of a :Eew tenths of a millimetre. For the assembly with an optical fibre, one starts by introducing in the skirt 43 a sleeve 44 (Figure 2), made of a semi-rigid plastics material, advantageously in polyamide of the nylon or rilsan>~ * (* a trade mark of Rhône-Polenc, a French Corporation, designating a Polyamid-12 molecular compound) type, which comprises a cylindrical body 45 with, at one end, a flange 46 of outer diameter larger than that of the body 45. The inner surface of the sleeve is formed with protrusions, such as for example those formed by a tapping 47.
The sleeve 44 is chosen such that the thickness of its wall 48 allows the introduction with a snug fit inside channel 49 which it provides, of the optical fibre 51 (Fig.3) formed for example of a core in silica glass 52 and a coating 53 comprising for example an ou-ter layer 54 for the protection, for example in Tefzel (registered trade-mark of Du Pont de Nemours) and a plastics optical layer or sleeve 55 having a refractive index lower than that of the glass.
After the introduction, a crimping operation is carried out by tightening the skirt 43 with pliers, the jaws ~7 - 3 -, 3~
of which for example delimit an hexagonal housing.
The tighteniny effort is transmi-ttecl by the skirt 43 which is deformed to the body 45 of sleeve 44, and the helical protrusion formed by the tapping 47 drives into the coatiny 54, without however passinq completely through it.
When the tightening effort is released, the skirt 43, which is permanently deformed, maintains in the position reached the body 45 of the sleeve, and the crimping remains.
For an assembly with an optical fibre of larger diameter, one uses a metallic tube 41 of same gauge, but which one provides with a sleeve 44' the wall 48' of body 45' having a smaller thickness, as is shown in Figure 5.
On the contrary, for an assembly with an optical fibre of smaller diameter, one uses a sleeve wi-th a thicker wall.
The risks of damage to the coating of the optical fibre are reduced relative to a crimping operation which is carried out with a tapping formed on a metallic wall.
In addition, the crimping effect is better distri-buted : it appears practically on the whole of the peripheryof the fibre, in spite of the polygonal shape of the crimping pliers.
Good results are obtained with tightening pressures varying within wide limits, so that i-t is not necessary to 9 set regulations of high precision for the tightening effort.
~ , : : '
Claims (7)
1. A fibre optic connector for receiving and fixedly securing a fibre optic having a core and a coating therearound, comprising :
a plastically deformable sleeve having an inner bore which is sized for slidably fitting around an end of a fibre optic, said bore having an inner surface provided with protrusions, said deformable sleeve being made out of a material which is harder than that of the fibre optic coating ; and a tube within which said sleeve may be inserted, said tube being permanently deformable under external compression force for applying pressure to said sleeve inserted therein to drive and maintain said protrusions into the plastic coating of a fibre optic introduced in said bore.
a plastically deformable sleeve having an inner bore which is sized for slidably fitting around an end of a fibre optic, said bore having an inner surface provided with protrusions, said deformable sleeve being made out of a material which is harder than that of the fibre optic coating ; and a tube within which said sleeve may be inserted, said tube being permanently deformable under external compression force for applying pressure to said sleeve inserted therein to drive and maintain said protrusions into the plastic coating of a fibre optic introduced in said bore.
2. The connector of claim 1, wherein said protrusions are formed by a threading on said inner surface of the bore in the sleeve.
3. The connector of any claims 1 or 2, wherein after permanent deformation said connector tube has a polygonal cross-sectional contour.
4. The connector of any of claims 1 or 2, wherein said sleeve has an outwardly extending terminal flange having a cross-sectional dimension larger than the internal dimension of said tube.
5. The connector of any of claims 1 or 2, wherein said tube has a thickness in the order of a few tenth of a millimeter.
6. The connector of any of claims 1 or 2 wherein said connector sleeve is a non slit sleeve.
7. The connector of any of claims 1 or 2 which is part of a set of connectors for fibre optics of different cross-sectional dimensions having each a core and a coating therearound, each connector tube having an internal cross-sectional dimension which is the same for all said different fibre optics, and each connector sleeve having an external cross-sectional dimension adapted to slidingly fit within the respective tube, and an inner bore sized for fitting around an end of the fibre optic of respective dimension.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7904696A FR2454108A1 (en) | 1979-02-23 | 1979-02-23 | DEVICE FOR ASSEMBLING AN OPTICAL FIBER WITH A PERIPHERAL METAL TUBE |
| FR7904696 | 1979-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1109306A true CA1109306A (en) | 1981-09-22 |
Family
ID=9222381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA330,305A Expired CA1109306A (en) | 1979-02-23 | 1979-06-21 | Optical fibre connector |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS55113010A (en) |
| CA (1) | CA1109306A (en) |
| DE (1) | DE2926575A1 (en) |
| FR (1) | FR2454108A1 (en) |
| GB (1) | GB2042755B (en) |
| IT (1) | IT1118989B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4789216A (en) * | 1981-09-25 | 1988-12-06 | Amphenol Corporation | Guide device for a light wave conductor |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5966220U (en) * | 1982-10-25 | 1984-05-02 | 三菱レイヨン株式会社 | cable plug |
| JPS5979814U (en) * | 1982-11-22 | 1984-05-30 | 矢崎総業株式会社 | Optical fiber connector ferrule |
| JPS59160112A (en) * | 1983-03-02 | 1984-09-10 | Fujitsu Ltd | Structure for fixing optical fiber of optical connector |
| FR2552889B1 (en) * | 1983-09-29 | 1985-12-13 | Souriau & Cie | METHOD FOR PRODUCING A PARTICULARLY OPTICAL FIBER CONNECTOR PLUG AND DEVICE FOR IMPLEMENTING THE METHOD |
| KR910006773B1 (en) * | 1984-01-30 | 1991-09-02 | 후루까와덴끼 고오교오 가부시끼가이샤 | Plastic optical fiber cord withe ferrule |
| JPS6188208A (en) * | 1984-10-08 | 1986-05-06 | Nec Corp | Optical fiber connector |
| DE3517388A1 (en) * | 1985-05-14 | 1986-11-20 | Allied Corp., Morristown, N.J. | CONNECTING PART FOR A FIBER-OPTICAL CABLE |
| GB2233471B (en) * | 1989-06-30 | 1993-02-24 | Philips Nv | Optical fibre connectors |
| JP2813432B2 (en) * | 1990-07-10 | 1998-10-22 | 古河電気工業株式会社 | Optical connector cover |
| US5073043A (en) * | 1990-09-06 | 1991-12-17 | Dimarco Brain A | Cable jacket restraint in optical fiber connectors |
| DE4410444C2 (en) * | 1994-03-25 | 1998-02-26 | Framatome Connectors Int | FO connector |
| DE19822005B4 (en) * | 1998-05-15 | 2007-08-30 | Lisa Dräxlmaier GmbH | Fiber optic connector barrel interconnection |
| EP1380866A1 (en) * | 2002-07-11 | 2004-01-14 | Agilent Technologies, Inc. - a Delaware corporation - | Optical fiber coupling apparatus |
| CN104384866A (en) * | 2014-11-25 | 2015-03-04 | 吴中区长桥诚惠机械加工厂 | Machining technology of solenoid |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3946467A (en) * | 1974-12-09 | 1976-03-30 | Northern Electric Company, Limited | Clamp for an optical fibre |
| FR2313687A1 (en) * | 1975-03-28 | 1976-12-31 | Thomson Csf | CONNECTOR FOR OPTICAL FIBER HARNESS |
| GB1556046A (en) * | 1975-07-09 | 1979-11-21 | Elliott Bros | Optical-fibre cables |
| DE2638110C3 (en) * | 1976-08-20 | 1981-05-21 | Siemens AG, 1000 Berlin und 8000 München | Capping for optical cables |
| GB1521778A (en) * | 1977-04-28 | 1978-08-16 | Post Office | Dielectric optical waveguides |
-
1979
- 1979-02-23 FR FR7904696A patent/FR2454108A1/en active Granted
- 1979-06-20 GB GB7921529A patent/GB2042755B/en not_active Expired
- 1979-06-21 IT IT68322/79A patent/IT1118989B/en active
- 1979-06-21 CA CA330,305A patent/CA1109306A/en not_active Expired
- 1979-06-30 DE DE19792926575 patent/DE2926575A1/en not_active Withdrawn
- 1979-07-20 JP JP9313379A patent/JPS55113010A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4789216A (en) * | 1981-09-25 | 1988-12-06 | Amphenol Corporation | Guide device for a light wave conductor |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1118989B (en) | 1986-03-03 |
| IT7968322A0 (en) | 1979-06-21 |
| FR2454108A1 (en) | 1980-11-07 |
| GB2042755B (en) | 1983-05-25 |
| JPS55113010A (en) | 1980-09-01 |
| DE2926575A1 (en) | 1980-08-28 |
| FR2454108B1 (en) | 1983-12-09 |
| GB2042755A (en) | 1980-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |