GB2153102A - Optical fibre connector element - Google Patents
Optical fibre connector element Download PDFInfo
- Publication number
- GB2153102A GB2153102A GB08401448A GB8401448A GB2153102A GB 2153102 A GB2153102 A GB 2153102A GB 08401448 A GB08401448 A GB 08401448A GB 8401448 A GB8401448 A GB 8401448A GB 2153102 A GB2153102 A GB 2153102A
- Authority
- GB
- United Kingdom
- Prior art keywords
- optical fibre
- sleeve
- connector element
- connector
- fibre connector
- 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.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 52
- 230000001681 protective effect Effects 0.000 claims abstract description 23
- 230000037431 insertion Effects 0.000 claims abstract description 12
- 238000003780 insertion Methods 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims abstract description 4
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000010437 gem Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 239000006117 anti-reflective coating Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3847—Details of mounting fibres in ferrules; Assembly methods; Manufacture with means preventing fibre end damage, e.g. recessed fibre surfaces
- G02B6/3849—Details of mounting fibres in ferrules; Assembly methods; Manufacture with means preventing fibre end damage, e.g. recessed fibre surfaces using mechanical protective elements, e.g. caps, hoods, sealing membranes
-
- 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
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
- G02B6/325—Optical coupling means having lens focusing means positioned between opposed fibre ends comprising a transparent member, e.g. window, protective plate
-
- 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
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3834—Means for centering or aligning the light guide within the ferrule
- G02B6/3835—Means for centering or aligning the light guide within the ferrule using discs, bushings or the like
-
- 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
- G02B6/3897—Connectors fixed to housings, casing, frames or circuit boards
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
An optical fibre connector element has a sleeve (30) and an arrangement for securing an optical fibre within the sleeve (36, 38, 39) at one end such that the free end of the fibre (37) is positioned deeply within the sleeve, relative to the other end. A closure is provided which comprises a protective window (33) and which is slidably mounted in the sleeve and is displaceable a resilient bias (34) from a position at or near said other end of the sleeve to a position deeply within the sleeve upon insertion of a cooperating male optical fibre connector element into the sleeve. <IMAGE>
Description
SPECIFICATION
Optical fibre connector element
This invention relates to an optical fibre connector element for retaining an optical fibre and to permit coupling with another optical fibre.
Optical fibre connector elements which form a "contact" for use in a plug and socket arrangement normally employ protective win .dows which form closures for ferrules which contain the optical fibre elements and thereby prevent the ingress of dirt and dust. In use it is essential that such windows are maintained clean and clear to ensure optimum optical transmission between mated "contacts".
In the case of plug and socket type connectors in which the plug part has projecting connector elements and the socket part has tubular connector portions into which the projecting'elements of the plug part can engage, it is difficult to clean protective windows if they are provided deeply within the tubular connector portion.
The present invention seeks to provide a connector element for forming the socket portion of an optical fibre connector in which the cleaning of the protective window is facilitated.
According to the invention there is provided an optical fibre connector element, comprising a sleeve, means for securing an optical fibre within the sleeve at one end such that the free end of the fibre is positioned deeply within the sleeve relative to the other end, a closure comprising a protective window slidably mounted in the sleeve and displaceable against a resilient bias from a position at or near said other end of the sleeve to a position deeply within the sleeve upon insertion of a cooperating male optical fibre connector element into the sleeve.
The connector element thereby permits cleaning of the outer face of the window prior to engagement of a cooperating male optical fibre element because the window is accessible from the end of the sleeve.
The closure may comprise a tubular element of external dimensions conforming to the internal dimensions of the sleeve to permit a sliding fit therein, which tubular element carries the protective window.
The protective window may be located in a recess in the end of the tubular element.
preferably the recess is deeper than the thickness of the protective window such that the outer surface of the window is located just below the sleeve end.
A seal may be provided which acts between and extends around the outer surface of the tubular element.
The means for securing an optical fibre may comprise a ferrule of external dimensions conforming to the internal dimensions of the tubular element of the closure, which tubular element is slidably located over the ferrule.
The ferrule may be fitted with a rod lens. The resilient bias may be provided by a compression spring which acts between the tubular element and the sleeve.
The arrangement may be such that the sleeve is provided on its outer surface intermediate of its ends with an outwardly extending flange for cooperation with a retaining clip of a connector housing. The invention also includes an optical fibre connector element as previously defined in combination with a male optical fibre connector element comprising a sleeve of external dimensions conforming to the internal dimensions of the sleeve of the other connector element to permit slidable insertion therein which ferrule is provided at one end with a protective window and is provided with means for securing an optical fibre when inserted from the other end.
The sleeve of the male connector may be provided on its outer surface intermediate of its ends with an outwardly extending flange for cooperation with a retaining clip of a connector housing.
Similarly to the female connecting element, the means for securing an optical fibre of male connecting element may comprise a ferrule slidably locatable inside its sleeve. This ferrule may be fitted at one end with a rod lens.
The protective window in the male connecting element may be located in a recess in the sleeve of depth greater than the thickness of the protective window such that the outer surface of the window is located just below the sleeve end.
The invention according to a further aspect comprises first and second mating housings, the first housing forming a socket part and being fitted with a plurality of female connector elements, as previously defined, and a second housing forming a plug part fitted with a plurality of male connector elements, as previously defined, disposed so as to be inserted into the connector elements of the socket part when the two housings are mated.
The connector elements are preferably provided with flanged ferrules as previously defined and are secured each in a different through hole in the body of the first or second housing which hole has a portion of transaxial dimensions equal to the transaxial dimensions of the sleeve adjoining a portion of transaxial dimensions equal to the transaxial dimensions of the flange, the wall of which latter portion is provided with a spring clip which extends inwardly of the hole towards its axis, is deflected outwardly during insertion of the element and springs back behind the flange to secure the element in the body.
In order that the invention and its various other preferred features may be understood more easily, embodiments thereof will now be described, by way of example only, with reference to the drawings, in which:
Figure 1 is a cross sectional view of a male optical fibre connector element for use in combination with the female connecting element of Figure 2 and which is shown mounted in the body of a housing only part of which is shown,
Figure 2 is a cross sectional view of a female optical fibre connector element constructed in accordance with the invention and which is also shown mounted in the body of a housing only part of which is shown, and
Figure 3 is a cross sectional view showing the connector elements of Figures 1 and 2 when the two housings are coupled.
Referring now to Figure 1 a male connector element comprises a cylindrical metal sleeve 10 having a portion of narrow diameter, forming the front end of the connector element and a portion of larger diameter, forming the rear end, joined by a radially outwardly extending flange 11. The cylindrical bore commencing from the end of the narrow diameter portion of the sleeve has a narrow portion which extends into the larger diameter portion of the sleeve adjoining a larger diameter portion which extends to the other end of the sleeve. The transition between bore diameters defines an abrupt step 1 2.
Slidably located in the narrow portion of the cylindrical bore from the large diameter end there is an elongate ferrule 13, of cylindrical cross section, having at its rearward end an outwardly extending flange 1 4 which engages the abrupt step 1 2. The ferrule at its front end has a rod lens 15. The ferrule is for receiving a secondary coated optical fibre 1 6 (shown fitted in the drawing) which is fitted prior to insertion in the sleeve. The fibre is fitted in a hypodermic tube 1 7 and is accurately axially positioned therein by means of a pair of spaced apart jewels 1 8 and is secured therein by means of an adhesive e.g. an epoxy resin.
The tube is accurately located in the ferrule 1 3 such that the polished end of the optical fibre is positioned at the focus of the rod lens 1 5 and is secured therein by light crimping and/or an adhesive e.g. an epoxy resin.
The ferrule 1 3 is held in the sleeve 10 with its flange 1 4 against the step 1 2 by means of a split cylindrical spacer 1 9 of outer diameter equal to the larger diameter portion of the cylindrical bore which spacer fits around the tube 1 7 behind the flange 1 4 and the rear end of the sleeve is rolled inwardly over the spacer to hold the parts in intimate secure contact.
The element described is intended for insertion in the body of a conventional electrical connector housing to replace the conductive pin. To this end the external dimensions of the sleeve are similar to that of the pin and it is secured in such a body 20 by insertion from the rear into a through hole in the body which hole in a direction from the rear to the front has a portion of diameter slightly larger than the flange 11 adjoining, via an abrupt edge, a portion of diameter equal to the narrow diameter portion of the sleeve. The larger diameter portion of the hole is provided with a spring retaining clip 20a which extends inwardly of the hole towards its axis in a direction towards the narrow diameter portion.
This spring is the well known ITT Cannon
Little Caeser clip. It is deflected outwardly by the flange 11 upon insertion of the connector element and springs back behind the flange to retain the element in the body of the housing.
It can be released from the rear by insertion of an appropriate tool. The housing has an interfacial seal 21.
The front end of the sleeve 10 is provided with a recess in which there is a protective window 22. As can be seen from the drawing the recess is of depth slightly larger than the thickness of the protective window so that the window outer surface, which has an anti reflective coating, is disposed just inside the end of the sleeve. This is to protect the surface against scratching when mating with the female connector element of Figure 2 as the windows do not come into contact.
It will be appreciated that the protective window of this connector is located near the surface and is accessible for cleaning. This would not be the case for a female connector having a socket portion of shape complementary to the projecting front end of the sleeve 10 as the window would necessarily have to be located deep within the socket portion and accordingly would not be easily accessible for cleaning.
The socket type connector element of Figure 2 which is designed to mate with the element of Figure 1 overcomes this problem and will now be described.
The connector element of Figure 2 comprises a cylindrical sleeve 30 which is shaped to permit mounting in the body 31 of a conventional housing similarly to the sleeve 10 of Figure 1. This sleeve has a cylindrical through bore which has a front portion of diameter conforming to the external diameter of the front portion of the sleeve 10 to act as a socket therefore. This portion of the bore adjoins via an abrupt step, a second portion of larger diameter which extends to the other end, or rear of the sleeve. A closure for the socket is formed by a tube 32 provided at one end with a window 33 located in a recess which similarly to the recess in the sleeve 10 of Figure 1 is of depth slightly greater than the thickness of the window to protect the window surface.
The tube 32 has a front portion of external diameter equal to the diameter of the front portion of the through bore of the sleeve 30 and a rear portion of external diameter equal to the rear portion of the through bore and is slidably located from the rear therein. The larger diameter portion is urged into engagement with the step in the bore by a compression coil spring 34. An annular seal 35 of rubber or other resilient material is provided in a recess in the sleeve 30 near its front end and seals between the sleeve and the tube 32. A ferrule 36 of construction similar to ferrule 1 3 carries an optical fibre 37 in a tube 38 provided with jewels 39 and is provided with a rod lens 40. This assembly is similar to
Figure 1 and will not be further described.
The ferrule 36 is of external diameter equal to the internal diameter of the tube 32 and is slidably locatable therein. At its rear end the ferrule has an external flange 41 of external diameter equal to the larger diameter bore portion of the sleeve 30, and the spring 34 acts between this flange and the rear end of the tube 32 so that the tube is urged forwards. After fitting an optical fibre, the assembly is completed by rolling the back end of the sleeve 30 inwardly at 42.
It will be appreciated that the drawings show only single connector elements and that a plug or socket housing would normally be provided with a multiplicity of such connector elements appropriately spaced for mutual engagement. When the plug and socket housings are brought together, their sleeves 10 and 30 are aligned, and during completion of the engagement operation the front end of sleeves 10 contact the front end of tubes 32 of respective connector elements in opposing housings and the tubes with the protective window are moved back against the spring pressure so that the two rod lenses are brought into close proximity and alignment and assume the correct positional relationship required for proper spacing between the windows so as to provide optimum optical performance. This can be seen in Figure 3 which also shows the slight spacing between the protective windows 22 and 33 which prevents scratching during coupling and release.
Claims (18)
1. An optical fibre connector element, comprising a sleeve, means for securing an optical fibre within the sleeve at one end such that the free end of the fibre is positioned deeply within the sleeve relative to the other end, a closure comprising a protective window slidably mounted in the sleeve and displaceable against a resilient bias from a position at or near said other end of the sleeve to a position deeply within the sleeve upon insertion of a cooperating male optical fibre connector element into the sleeve.
2. An optical fibre connector element as claimed in claim 1, wherein the closure comprises a tubular element of external dimensions conforming to the internal dimensions of the sleeve to permit a sliding fit therein which tubular element carries the protective window.
3. An optical fibre connector element as claimed in claim 2, wherein the protective window is located in a recess in the end of the tubular element.
4. An optical fibre connector element as claimed in claim 3, wherein the recess is deeper than the thickness of the protective window such that the outer surface of the window is located just below the tubular element end.
5. An optical fibre connector element as claimed in claim 2, 3 or 4, comprising a seal acting between and extending around the inner surface of the sleeve and the outer surface of the tubular element.
6. An optical fibre connector element as claimed in any one of claims 2 to 5 wherein the means for securing an optical fibre comprises a ferrule of external dimensions conforming to the internal dimensions of the tubular element of the closure, which tubular element is slidably located over the ferrule.
7. An optical fibre connector element as claimed in claim 6, wherein the ferrule is fitted at one end with a rod lens.
8. An optical fibre connector element as claimed in any one of claims 2 to 7, wherein the resilient bias is provided by a compression spring which acts between the tubular element and the sleeve.
9. An optical fibre connector element as claimed in any one of the preceding claims, wherein the sleeve is provided on its outer surface intermediate of its ends with an out wardiy extending flange for cooperation with a retaining clip of a connector housing.
10. An optical fibre connector element sub stantiaily as described herein with reference to
Figure 2 of the drawings.
11. An optical fibre connector element as claimed in any one of the preceding claims in combination with a male optical fibre connector element comprising a sleeve of external dimensions conforming to the internal dimensions of the sleeve of the other connector element to permit slidable insertion therein which ferrule is provided at one end with a protective window and is provided with means for securing an optical fibre when inserted from the other end.
1 2. An optical fibre connector combination as claimed in claim 11, wherein the sleeve of the male connector is provided on its outer surface intermediate of its ends with an outwardly extending flange for cooperation with a retaining clip of a connector housing.
1 3. An optical fibre connector combination as claimed in claim 11 or 12, wherein the means for securing an optical fibre comprises a ferrule slidably locatable inside the sleeve of the male connector element.
14. An optical fibre connector combination as claimed in claim 13, wherein the ferrule of the male connector element is fitted at one end with a rod lens.
1 5. An optical fibre connector combination as claimed in any one of claims 11 to 14, wherein the protective window is located in a recess in the sleeve of depth greater than the thickness of the protective window such that the outer surface of the window is located just below the sleeve end.
1 6. An optical fibre connector element combination as claimed in claim 11 wherein the male connector element is substantially as described herein with reference to Figure 1 of the drawings.
1 7. An optical fibre coupling comprising first and second mating housings, the first housing forming a socket part and being fitted with a plurality of connector elements as claimed in any one of claims 1 to 10 and the second housing forming a plug part fitted with a plurality of male optical fibre connector elements as defined in any one of claims 1 2 to 1 6 disposed so as to be inserted into the connector elements of the socket part when the two housings are mated.
18. An optical fibre coupling as claimed in claim 1 7 employing connector elements as claimed in claim 9 and 1 2 which are secured each in a different through hole in the body of the first or second housing which hole has a portion of transaxial dimension equal to the transaxial dimensions of the sleeve adjoining a portion of transaxial dimensions equal to the transaxial dimensions of the flange, the wall of which latter portion is provided with a spring clip which extends inwardly of the hole towards its axis, is deflected outwardly during insertion of the element and springs back behind the flange to secure the element in the body.
1 9. An optical fibre coupling substantially as described herein with reference to Figure 3 of the drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08401448A GB2153102B (en) | 1984-01-19 | 1984-01-19 | Optical fibre connector element |
| DE19853501467 DE3501467A1 (en) | 1984-01-19 | 1985-01-18 | OPTICAL CONNECTOR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08401448A GB2153102B (en) | 1984-01-19 | 1984-01-19 | Optical fibre connector element |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8401448D0 GB8401448D0 (en) | 1984-02-22 |
| GB2153102A true GB2153102A (en) | 1985-08-14 |
| GB2153102B GB2153102B (en) | 1987-06-17 |
Family
ID=10555245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08401448A Expired GB2153102B (en) | 1984-01-19 | 1984-01-19 | Optical fibre connector element |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3501467A1 (en) |
| GB (1) | GB2153102B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0309214A2 (en) * | 1987-09-22 | 1989-03-29 | BAXTER INTERNATIONAL INC. (a Delaware corporation) | Fiber optical probe connector for physiologic measurement devices |
| US4974929A (en) * | 1987-09-22 | 1990-12-04 | Baxter International, Inc. | Fiber optical probe connector for physiologic measurement devices |
| US8517922B2 (en) | 2004-12-10 | 2013-08-27 | Olympus Corporation | Endoscope and endoscope system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004042142A1 (en) * | 2004-08-31 | 2006-03-16 | Telegärtner Gerätebau GmbH | Fiber optic connector for information processing and transmission, has protection component enclosing and overlapping plugging component and arranged such that it releases ferrule end of plugging component with establishment of connection |
| CN105044854B (en) * | 2015-06-28 | 2017-11-10 | 中航光电科技股份有限公司 | A kind of optical fiber connecting element |
| CN105044855A (en) * | 2015-06-28 | 2015-11-11 | 中航光电科技股份有限公司 | Optical fiber contact member positioning shell |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1461400A (en) * | 1973-06-06 | 1977-01-13 | Secr Defence | Connectors for liquid-core optical fibres |
| GB1478134A (en) * | 1975-03-28 | 1977-06-29 | Thomson Csf | Optical fibres bundles connector |
| GB1566929A (en) * | 1977-12-22 | 1980-05-08 | Standard Telephones Cables Ltd | Coupling optical fibres |
| GB2034496A (en) * | 1978-10-18 | 1980-06-04 | Bunker Ramo | Fibre optic connector |
-
1984
- 1984-01-19 GB GB08401448A patent/GB2153102B/en not_active Expired
-
1985
- 1985-01-18 DE DE19853501467 patent/DE3501467A1/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1461400A (en) * | 1973-06-06 | 1977-01-13 | Secr Defence | Connectors for liquid-core optical fibres |
| GB1478134A (en) * | 1975-03-28 | 1977-06-29 | Thomson Csf | Optical fibres bundles connector |
| GB1566929A (en) * | 1977-12-22 | 1980-05-08 | Standard Telephones Cables Ltd | Coupling optical fibres |
| GB2034496A (en) * | 1978-10-18 | 1980-06-04 | Bunker Ramo | Fibre optic connector |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0309214A2 (en) * | 1987-09-22 | 1989-03-29 | BAXTER INTERNATIONAL INC. (a Delaware corporation) | Fiber optical probe connector for physiologic measurement devices |
| EP0309214A3 (en) * | 1987-09-22 | 1990-03-14 | BAXTER INTERNATIONAL INC. (a Delaware corporation) | Fiber optical probe connector for physiologic measurement devices |
| US4974929A (en) * | 1987-09-22 | 1990-12-04 | Baxter International, Inc. | Fiber optical probe connector for physiologic measurement devices |
| US8517922B2 (en) | 2004-12-10 | 2013-08-27 | Olympus Corporation | Endoscope and endoscope system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8401448D0 (en) | 1984-02-22 |
| GB2153102B (en) | 1987-06-17 |
| DE3501467A1 (en) | 1985-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |