US20090092360A1 - Small form factor, field-installable optical fiber connector - Google Patents
Small form factor, field-installable optical fiber connector Download PDFInfo
- Publication number
- US20090092360A1 US20090092360A1 US11/869,542 US86954207A US2009092360A1 US 20090092360 A1 US20090092360 A1 US 20090092360A1 US 86954207 A US86954207 A US 86954207A US 2009092360 A1 US2009092360 A1 US 2009092360A1
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- United States
- Prior art keywords
- optical fiber
- fiber connector
- connector
- protrusion
- housing
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- 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
- G02B6/3846—Details of mounting fibres in ferrules; Assembly methods; Manufacture with fibre stubs
-
- 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
- G02B6/3855—Details of mounting fibres in ferrules; Assembly methods; Manufacture characterised by the method of anchoring or fixing the fibre within the ferrule
- G02B6/3858—Clamping, i.e. with only elastic deformation
Definitions
- the present invention generally relates to an optical fiber connector, and more particularly to an optical fiber connector including a clamping assembly having a groove of a cam member, which can generate a clamping force and be adapted to clamp a terminating fiber.
- optical fibers have been widely used as signal transmission media because of their high bandwidth and low loss nature.
- An optical fiber connector is a mechanical device disposed at an end of the optical fiber and acts as a connector of optical path when the optical fibers are joined to each other.
- U.S. Pat. No. 6,318,903 B1 entitled “Optical fiber connector for backplane” discloses an optical fiber connector 11 including a protective dust cap 48 , a connector housing 12 , a ferrule-barrel assembly 20 , a coil spring 26 , an insert 27 , a crimping member 34 , a clip member 40 , a protective boot 46 and an incoming fiber cable 36 , which are assembled in sequence so as to finish the optical fiber connector 11 shown in FIG. 2 .
- the end of the optical fiber is commonly presented for mating in a polished ferrule.
- the Fresnel loss is a loss of light quantity between interfaces of two mediums when the light is transmitted from a medium to another medium.
- a polished ferrule assembly is most readily prepared in a controlled setting, wherein precision equipment and skilled craftsmen are available for cleaving the optical fiber, and terminating it in a ferrule, and polishing the ferrule and the optical fiber to exacting tolerances.
- an optical fiber connector that can be installed in the field where such facilities and craftsmen are not available. Under these conditions, it is desirable to omit the step of the polishing the ferrule/optical fiber in the field by instead terminating the optical fiber in an optical fiber connector which has a fiber stub already terminated and polished in a ferrule. Then, a terminating fiber of an incoming fiber cable is optically coupled to the fiber stub in the optical fiber connector, often with the use of a refractive index matched gel to improve optical coupling therebetween.
- U.S. Patent Publication No. 2006/0002662 A1 entitled “Small Form Factor, Field-Installable Connector” discloses a small form factor, field-installable optical fiber connector 110 including a connector housing 112 , a ferrule 113 , a clamping assembly 111 , a resilient member 115 and a rear body 116 .
- the ferrule 113 is disposed in the connector housing 112 .
- a fiber stub 114 is already terminated, polished in a ferrule 113 , and mounted in the ferrule 113 by means of a conventional adhesive, e.g. epoxy.
- the clamping assembly 111 is disposed in the connector housing 112 and located behind the ferrule 113 .
- the clamping assembly 111 includes a housing 120 , a platform 130 , first and second cam members 140 , 150 and an actuator 160 , wherein all the platform 130 , the first and second cam members 140 , 150 and the actuator 160 are disposed in the housing 120 .
- the resilient member 115 is disposed in the connector housing 112 .
- the rear body 116 is disposed at the rear end of the connector housing 112 and configured to provide a backstop against which the resilient member 115 can press to bias the ferrule 113 and the clamping assembly 111 forward.
- the present invention provides an optical fiber connector including a connector housing, a ferrule and a clamping assembly.
- the connector hosing has a front end and a rear end.
- the ferrule is disposed in the connector housing and projects from the front end of the connector housing.
- the clamping assembly is disposed in the connector housing for mounting the ferrule, and includes a hollow housing and a cam member, wherein the cam member includes a groove adapted to clamp a terminating fiber when a cam effect between the hollow housing and the cam member is generated and further the cam effect causes the groove of the cam member to generate a clamping force.
- the optical fiber connector of the present invention it is easy to rework for the terminating fiber disclosed in the present invention. Once the installation of the terminating fiber is wrong, the terminating fiber can be pulled out from the optical fiber connector by a hand with/without a tool. Compared with the prior art, the clamping assembly of the present invention is a simple structure and is easily used.
- FIG. 1 is an exploded perspective schematic view of an optical fiber connector in the prior art, showing a small form factor, factory-installable optical fiber connector.
- FIG. 2 is a perspective schematic view of the optical fiber connector of FIG. 1 after assembly.
- FIG. 3 is cross-sectional schematic view of another optical fiber connector in the prior art, showing a small form factor, field-installable optical fiber connector.
- FIG. 4 is an exploded perspective schematic view of an optical fiber connector according to an embodiment of the present invention.
- FIG. 5 is a perspective schematic view of the optical fiber connector of FIG. 4 after assembly.
- FIG. 6 is a cross-sectional schematic view of the optical fiber connector of FIG. 4 after assembly.
- FIG. 7 is an exploded perspective schematic view of a clamping assembly according to the embodiment of the present invention.
- FIG. 8 is a perspective schematic view of the clamping assembly of FIG. 7 after assembly.
- FIG. 9 is a cross-sectional schematic view of the cam member along line 9 - 9 of FIG. 7 .
- FIG. 10 is a cross-sectional schematic view of the clamping assembly along line 10 - 10 of FIG. 8 .
- FIG 11 a is a cross-sectional schematic view of the clamping assembly of the present invention, showing that the cam member further includes a sheet element.
- FIG. 11 b is a cross-sectional schematic view of the clamping assembly of the present invention, showing that the width of the sheet element of the cam member is bigger than the difference between the depth of the U-shaped groove and the diameter of the terminating fiber
- FIG. 12 is a cross-sectional schematic view of a clamping assembly according to an alternative embodiment of the present invention.
- FIGS. 4 to 6 they depict an optical fiber connector 210 according to an embodiment of the present invention.
- the optical fiber connector 210 can be a kind of small form factor, field-installable optical fiber connector, or a kind of small form factor, factory-installable optical fiber connector.
- the optical fiber connector 210 which is the small form factor, field-installable optical fiber connector is discussed in greater detail below.
- the optical fiber connector 210 includes a connector housing 212 , a ferrule 213 , a clamping assembly 211 , a resilient member 215 and an insert member 216 .
- the connector housing 212 can be a small form factor housing and defines a front orientation 206 and a back orientation 208 .
- the ferrule 213 is disposed in the connector housing 212 and projects from a front end 274 of the connector housing 212 along the front orientation 206 .
- a fiber stub 214 is already terminated, polished in a ferrule 213 , and mounted in the ferrule 213 by means of a conventional adhesive, e.g. epoxy.
- a terminating fiber 204 of an incoming fiber cable is optically coupled to the fiber stub 214 in the optical fiber connector 210 , often with the use of a refractive index matched gel to improve optical coupling therebetween.
- the clamping assembly 211 is disposed in the connector housing 212 for mounting the ferrule 213 , and is adapted for clamping the terminating fiber 204 , i.e. the terminating fiber 204 cannot escape from the optical fiber connector 110 .
- the clamping assembly 211 includes a hollow housing 220 and a cam member 240 .
- the front portion 232 of the hollow housing 220 can be adapted to mount the ferrule 213 , and cause the ferrule 213 to align with the clamping assembly 211 along the front orientation 206 .
- the front portion 232 of the hollow housing 220 has an annular flange 222 , which contacts the resilient member 215 and is adapted for stopping the hollow housing 220 on the inner wall 230 of the connector housing 212 (shown in FIG. 6 ).
- the hollow housing 220 has an L-shaped opening 262 which is located at the rear portion 232 thereof, and the L-shaped opening 262 is a through opening and includes a first opening 264 and a second opening 266 .
- the cam member 240 includes a cylindrical portion 242 and a holding portion 244 , wherein the cylindrical portion 242 is physically connected to the holding portion 244 .
- the cylindrical portion 242 is disposed in the rear portion 234 of the hollow housing 220 , and the holding portion 244 is exposed out from the rear portion 234 of the hollow housing 220 .
- the diameter of the cylindrical portion 242 is equal to or slightly less than the inner diameter of the rear portion 234 of the hollow housing 220 (shown in FIG. 6 ).
- the front end of the cylindrical portion 242 is provided with a first protrusion 246 , e.g.
- the surface of the cylindrical portion 242 is provided with a second protrusion 248 , e.g. arc bar-shaped protrusion.
- the second protrusion 248 and the first protrusion 246 define a direction, which is parallel to the back orientation 208 of the connector housing 212 , and the second protrusion 248 can be physically connected to the first protrusion 246 .
- the height H 1 of the first protrusion 246 can be more than the height H 2 of the second protrusion 248 .
- the height H 1 of the first protrusion 246 can be equal to or less than the difference between the outer radius and the inner radius of the rear portion 234 of the hollow housing 220 .
- the height H 2 of the second protrusion 248 can be equal to or less than a half of the difference between the outer radius and the inner radius of the rear portion 234 of the hollow housing 220 .
- the cam member 240 further includes a U-shaped groove 252 , which passes through a half of volumes of the cylindrical portion 242 and the holding portion 244 , respectively.
- the space of the first bottom 254 of the U-shaped groove 252 is equal to or slightly bigger than the volume of the terminating fiber 204 , whereby the U-shaped groove 252 accommodates the terminating fiber 204 during installation.
- the space of the second bottom 256 of the U-shaped groove 252 is bigger than the volume of the terminating fiber 204 , wherein the space of the second bottom 256 is bigger than the space of the first bottom 254 , whereby the insert member 216 cannot harmfully pressurize the terminating fiber 204 after installation (shown in FIG. 6 ).
- the first protrusion 246 is moved along the first opening 264 of the L-shaped opening 262 , and simultaneously the cylindrical portion 242 is inserted into the rear portion 234 of the hollow housing 220 .
- the space of the first bottom 254 of the U-shaped groove 252 has accommodated a part of the fiber stub 214 .
- the terminating fiber 204 is inserted into the spaces of the bottom 254 , 256 of the U-shaped groove 252 and is optically coupled to the fiber stub 214 .
- the holding portion 244 of the cam member 240 is turned (e.g. clockwise), i.e.
- the first protrusion 246 is moved along the second opening 266 of the L-shaped opening 262 so as to position the cam member 240 and to prevent the cam member 240 from slip.
- the inner wall 278 of the hollow housing 220 compresses the second protrusion 248 , and thus a cam effect (i.e. the first cam effect) between the hollow housing 220 and the first cam member 240 is generated and further the cam effect causes two sides 272 of the U-shaped groove 252 of the cam member 240 to generate a clamping force so as to clamp the terminating fiber 204 , shown in FIG. 10 .
- a predetermined angle ⁇ is formed between the orientations the U-shaped groove 252 and the second protrusion 248 .
- the predetermined angle ⁇ can affect the clamping force, and is not more than 71.5 degrees. Furthermore, if the optical fiber connector is requested to be disassembled in the field, the above-mentioned clamping processes will be contrarily carried out. For example, the holding portion 244 of the cam member 240 is turned (e.g. anticlockwise) so as to loosen the terminating fiber 204 . In addition, if the terminating fiber 204 is not a symmetrical circle of 360 degrees (e.g. the terminating fiber 204 is a polarizing fiber), the cam member 240 can be turned to the necessary angle.
- the cam member 240 further includes a sheet element 280 .
- the sheet element 280 is put in the U-shaped groove 252 and contacts the terminating fiber 204 .
- the holding portion 244 of the cam member 240 is turned so as to drive the cylindrical portion 242 to be turned.
- the cam effect causes two sides 272 of the U-shaped groove 252 of the cam member 240 to generate a clamping force so as to clamp the terminating fiber 204 and the sheet element 280 .
- the sheet element 280 can be adapted to effectively mount the terminating fiber 204 in the optical fiber connector, and prevents the terminating fiber 204 from moving.
- the size of the sheet element 280 is not bigger than the size of the U-shaped groove 252 .
- the thickness of the sheet element 280 is not bigger than the distance between the two sides 272 of the U-shaped groove 252 , the length of the sheet element 280 is not bigger than the length of the U-shaped groove 252 , and the width of the sheet element 280 is not bigger than the difference between the depth of the U-shaped groove 252 and the diameter of the terminating fiber 204 .
- the thickness of the sheet element 280 is equal to a half of the distance between the two sides 272 of the U-shaped groove 252 .
- the width of the sheet element 280 is bigger than the difference between the depth of the U-shaped groove 252 and the diameter of the terminating fiber 204 .
- the cylindrical portion 242 of the cam member 240 is turned, the inner wall 278 of the hollow housing 220 compresses the sheet element 280 and thus another cam effect (i.e. the second cam effect) between the hollow housing 220 and the cam member 240 is generated.
- the second cam effect also causes the sheet element 280 to generate a clamping force so as to clamp the terminating fiber 204 .
- the present invention can independently provide the second cam effect by only using the sheet element 280 without the second protrusion 248 , thereby clamping the terminating fiber 204 .
- FIG. 12 it depicts a clamping assembly 211 ′ according to an alternative embodiment of the present invention.
- the clamping assembly 211 ′ is substantially similar to the clamping assembly 211 , wherein the similar elements are designated with the similar reference numerals.
- the clamping assembly 211 ′ includes a hollow housing 220 ′ and a cam member 240 ′.
- the difference between the clamping assembly 211 ′ and the clamping assembly 211 is that the cam member 240 ′ includes a through groove 252 ′ rather than a U-shaped groove 252 .
- the through groove 252 ′ passes through all volumes of the cylindrical portion 242 ′ and the holding portion (not shown), respectively.
- the cylindrical portion 242 ′ and the holding portion are constituted by a first portion 243 a and a second portion 243 b .
- the space of the intermediate region 254 ′ of the through groove 252 ′ is equal to or slightly bigger than the volume of the terminating fiber 204 , whereby the through groove 252 ′ accommodates the terminating fiber 204 during installation.
- the champing and assembling processes of the clamping assembly 211 ′ is substantially similar to those of the clamping assembly 211 in the field.
- the optical fiber connector of the present invention it is easy to rework for the terminating fiber disclosed in the present invention. Once the installation of the terminating fiber is wrong, the terminating fiber can be pulled out from the optical fiber connector by a hand with/without a tool. Compared with the prior art, the clamping assembly of the present invention is a simple structure and is easily used.
- the resilient member 215 e.g. spring
- the insert member 216 is disposed in the rear end 276 of the connector housing 212 (e.g. a part of the insert member 216 is screwedly mounted in the rear end 276 of the connector housing 212 ), and exposes out a part of the clamping assembly (i.e. the holding portion 244 of the cam member 240 ), wherein during assembly of the optical fiber connector the resilient member 215 can press to bias the ferrule 213 and the clamping assembly 211 forward so as to finish the optical fiber connector 210 .
- the ferrule 213 of the optical fiber connector 210 is not provided with the fiber stub 214 .
- the terminating fiber 204 of the factory-installable optical fiber connector will be extended to the original location of the fiber stub 214 of the field-installable optical fiber connector.
- the method for assembling the small form factor, factory-installable optical fiber connector has no step adapted for optically coupling the terminating fiber 204 to the fiber stub 214 .
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Abstract
Description
- 1. Field of the Invention
- The present invention generally relates to an optical fiber connector, and more particularly to an optical fiber connector including a clamping assembly having a groove of a cam member, which can generate a clamping force and be adapted to clamp a terminating fiber.
- 2. Description of the Related Art
- Recently, optical fibers have been widely used as signal transmission media because of their high bandwidth and low loss nature. In order to transmit over a longer distance, it is common to use a high power diode laser to launch a laser beam into the optical fiber. An optical fiber connector is a mechanical device disposed at an end of the optical fiber and acts as a connector of optical path when the optical fibers are joined to each other.
- A conventional small form factor, optical fiber connector must be readily assembled in the factory, and there are too many separated components so as to have a complex processes of assembly. For example, referring to
FIG. 1 , U.S. Pat. No. 6,318,903 B1, entitled “Optical fiber connector for backplane” discloses anoptical fiber connector 11 including aprotective dust cap 48, aconnector housing 12, a ferrule-barrel assembly 20, acoil spring 26, aninsert 27, acrimping member 34, aclip member 40, aprotective boot 46 and anincoming fiber cable 36, which are assembled in sequence so as to finish theoptical fiber connector 11 shown inFIG. 2 . - In order to effect optical coupling and minimize the Fresnel loss, the end of the optical fiber is commonly presented for mating in a polished ferrule. The Fresnel loss is a loss of light quantity between interfaces of two mediums when the light is transmitted from a medium to another medium. In the factory, a polished ferrule assembly is most readily prepared in a controlled setting, wherein precision equipment and skilled craftsmen are available for cleaving the optical fiber, and terminating it in a ferrule, and polishing the ferrule and the optical fiber to exacting tolerances.
- However, there is a need for an optical fiber connector that can be installed in the field where such facilities and craftsmen are not available. Under these conditions, it is desirable to omit the step of the polishing the ferrule/optical fiber in the field by instead terminating the optical fiber in an optical fiber connector which has a fiber stub already terminated and polished in a ferrule. Then, a terminating fiber of an incoming fiber cable is optically coupled to the fiber stub in the optical fiber connector, often with the use of a refractive index matched gel to improve optical coupling therebetween.
- For example, referring to FIG. 3, U.S. Patent Publication No. 2006/0002662 A1, entitled “Small Form Factor, Field-Installable Connector” discloses a small form factor, field-installable
optical fiber connector 110 including aconnector housing 112, aferrule 113, aclamping assembly 111, aresilient member 115 and arear body 116. Theferrule 113 is disposed in theconnector housing 112. Afiber stub 114 is already terminated, polished in aferrule 113, and mounted in theferrule 113 by means of a conventional adhesive, e.g. epoxy. Then, a terminating fiber (not shown) is optically coupled to thefiber stub 114 in theoptical fiber connector 110. Theclamping assembly 111 is disposed in theconnector housing 112 and located behind theferrule 113. Theclamping assembly 111 includes ahousing 120, aplatform 130, first andsecond cam members actuator 160, wherein all theplatform 130, the first andsecond cam members actuator 160 are disposed in thehousing 120. Since theactuator 160 forces thesecond cam member 150 forward relative to thefirst cam members 140, a cam effect between the first andsecond cam members platform 130 and thefirst cam members 140 is generated so as to receive and retain the terminating fiber, i.e. the terminating fiber cannot escape from theoptical fiber connector 110. Theresilient member 115 is disposed in theconnector housing 112. Therear body 116 is disposed at the rear end of theconnector housing 112 and configured to provide a backstop against which theresilient member 115 can press to bias theferrule 113 and theclamping assembly 111 forward. - However, it is difficult to rework for the terminating fiber disclosed in U.S. Patent Publication No. 2006/0002662 A1. Once the installation of the terminating fiber is wrong, the terminating fiber must be pulled out from the optical fiber connector by a tool. Furthermore, the clamping assembly disclosed by U.S. Patent Publication No. 2006/0002662 A1 is a complex structure.
- Accordingly, there exists a need for an optical fiber connector capable of solving the above-mentioned problems.
- It is an object of the present invention to provide an optical fiber connector including a clamping assembly having a groove of a cam member, which can generates a clamping force and be adapted to clamp a terminating fiber.
- In order to achieve the foregoing object, the present invention provides an optical fiber connector including a connector housing, a ferrule and a clamping assembly. The connector hosing has a front end and a rear end. The ferrule is disposed in the connector housing and projects from the front end of the connector housing. The clamping assembly is disposed in the connector housing for mounting the ferrule, and includes a hollow housing and a cam member, wherein the cam member includes a groove adapted to clamp a terminating fiber when a cam effect between the hollow housing and the cam member is generated and further the cam effect causes the groove of the cam member to generate a clamping force.
- According to the optical fiber connector of the present invention, it is easy to rework for the terminating fiber disclosed in the present invention. Once the installation of the terminating fiber is wrong, the terminating fiber can be pulled out from the optical fiber connector by a hand with/without a tool. Compared with the prior art, the clamping assembly of the present invention is a simple structure and is easily used.
- The foregoing, as well as additional objects, features and advantages of the invention will be more apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
-
FIG. 1 is an exploded perspective schematic view of an optical fiber connector in the prior art, showing a small form factor, factory-installable optical fiber connector. -
FIG. 2 is a perspective schematic view of the optical fiber connector ofFIG. 1 after assembly. -
FIG. 3 is cross-sectional schematic view of another optical fiber connector in the prior art, showing a small form factor, field-installable optical fiber connector. -
FIG. 4 is an exploded perspective schematic view of an optical fiber connector according to an embodiment of the present invention. -
FIG. 5 is a perspective schematic view of the optical fiber connector ofFIG. 4 after assembly. -
FIG. 6 is a cross-sectional schematic view of the optical fiber connector ofFIG. 4 after assembly. -
FIG. 7 is an exploded perspective schematic view of a clamping assembly according to the embodiment of the present invention. -
FIG. 8 is a perspective schematic view of the clamping assembly ofFIG. 7 after assembly. -
FIG. 9 is a cross-sectional schematic view of the cam member along line 9-9 ofFIG. 7 . -
FIG. 10 is a cross-sectional schematic view of the clamping assembly along line 10-10 ofFIG. 8 . - FIG 11 a is a cross-sectional schematic view of the clamping assembly of the present invention, showing that the cam member further includes a sheet element.
-
FIG. 11 b is a cross-sectional schematic view of the clamping assembly of the present invention, showing that the width of the sheet element of the cam member is bigger than the difference between the depth of the U-shaped groove and the diameter of the terminating fiber -
FIG. 12 is a cross-sectional schematic view of a clamping assembly according to an alternative embodiment of the present invention. - Referring to
FIGS. 4 to 6 , they depict anoptical fiber connector 210 according to an embodiment of the present invention. Theoptical fiber connector 210 can be a kind of small form factor, field-installable optical fiber connector, or a kind of small form factor, factory-installable optical fiber connector. In this embodiment, theoptical fiber connector 210 which is the small form factor, field-installable optical fiber connector is discussed in greater detail below. - The
optical fiber connector 210 includes aconnector housing 212, aferrule 213, aclamping assembly 211, aresilient member 215 and aninsert member 216. Theconnector housing 212 can be a small form factor housing and defines afront orientation 206 and aback orientation 208. Theferrule 213 is disposed in theconnector housing 212 and projects from afront end 274 of theconnector housing 212 along thefront orientation 206. Afiber stub 214 is already terminated, polished in aferrule 213, and mounted in theferrule 213 by means of a conventional adhesive, e.g. epoxy. Then, a terminatingfiber 204 of an incoming fiber cable is optically coupled to thefiber stub 214 in theoptical fiber connector 210, often with the use of a refractive index matched gel to improve optical coupling therebetween. The clampingassembly 211 is disposed in theconnector housing 212 for mounting theferrule 213, and is adapted for clamping the terminatingfiber 204, i.e. the terminatingfiber 204 cannot escape from theoptical fiber connector 110. - Referring to
FIGS. 7 and 8 , the clampingassembly 211 includes ahollow housing 220 and acam member 240. After assembly, thefront portion 232 of thehollow housing 220 can be adapted to mount theferrule 213, and cause theferrule 213 to align with the clampingassembly 211 along thefront orientation 206. Also, thefront portion 232 of thehollow housing 220 has anannular flange 222, which contacts theresilient member 215 and is adapted for stopping thehollow housing 220 on theinner wall 230 of the connector housing 212 (shown inFIG. 6 ). Also, thehollow housing 220 has an L-shapedopening 262 which is located at therear portion 232 thereof, and the L-shapedopening 262 is a through opening and includes afirst opening 264 and asecond opening 266. - The
cam member 240 includes acylindrical portion 242 and a holdingportion 244, wherein thecylindrical portion 242 is physically connected to the holdingportion 244. After the clampingassembly 211 is assembled, thecylindrical portion 242 is disposed in therear portion 234 of thehollow housing 220, and the holdingportion 244 is exposed out from therear portion 234 of thehollow housing 220. The diameter of thecylindrical portion 242 is equal to or slightly less than the inner diameter of therear portion 234 of the hollow housing 220 (shown inFIG. 6 ). Referring toFIG. 7 again, the front end of thecylindrical portion 242 is provided with afirst protrusion 246, e.g. rectangular or circular lump-shaped protrusion, and the surface of thecylindrical portion 242 is provided with asecond protrusion 248, e.g. arc bar-shaped protrusion. Thesecond protrusion 248 and thefirst protrusion 246 define a direction, which is parallel to theback orientation 208 of theconnector housing 212, and thesecond protrusion 248 can be physically connected to thefirst protrusion 246. ReferringFIG. 9 , the height H1 of thefirst protrusion 246 can be more than the height H2 of thesecond protrusion 248. The height H1 of thefirst protrusion 246 can be equal to or less than the difference between the outer radius and the inner radius of therear portion 234 of thehollow housing 220. The height H2 of thesecond protrusion 248 can be equal to or less than a half of the difference between the outer radius and the inner radius of therear portion 234 of thehollow housing 220. Thecam member 240 further includes aU-shaped groove 252, which passes through a half of volumes of thecylindrical portion 242 and the holdingportion 244, respectively. The space of thefirst bottom 254 of theU-shaped groove 252 is equal to or slightly bigger than the volume of the terminatingfiber 204, whereby theU-shaped groove 252 accommodates the terminatingfiber 204 during installation. Also, the space of thesecond bottom 256 of theU-shaped groove 252 is bigger than the volume of the terminatingfiber 204, wherein the space of thesecond bottom 256 is bigger than the space of thefirst bottom 254, whereby theinsert member 216 cannot harmfully pressurize the terminatingfiber 204 after installation (shown inFIG. 6 ). - More detailed, during assembly of the optical fiber connector in the field, the
first protrusion 246 is moved along thefirst opening 264 of the L-shapedopening 262, and simultaneously thecylindrical portion 242 is inserted into therear portion 234 of thehollow housing 220. The space of thefirst bottom 254 of theU-shaped groove 252 has accommodated a part of thefiber stub 214. Then, the terminatingfiber 204 is inserted into the spaces of the bottom 254, 256 of theU-shaped groove 252 and is optically coupled to thefiber stub 214. Finally, the holdingportion 244 of thecam member 240 is turned (e.g. clockwise), i.e. thefirst protrusion 246 is moved along thesecond opening 266 of the L-shapedopening 262 so as to position thecam member 240 and to prevent thecam member 240 from slip. Simultaneously, theinner wall 278 of thehollow housing 220 compresses thesecond protrusion 248, and thus a cam effect (i.e. the first cam effect) between thehollow housing 220 and thefirst cam member 240 is generated and further the cam effect causes twosides 272 of theU-shaped groove 252 of thecam member 240 to generate a clamping force so as to clamp the terminatingfiber 204, shown inFIG. 10 . Referring toFIG. 9 again, a predetermined angle θ is formed between the orientations theU-shaped groove 252 and thesecond protrusion 248. The predetermined angle θ can affect the clamping force, and is not more than 71.5 degrees. Furthermore, if the optical fiber connector is requested to be disassembled in the field, the above-mentioned clamping processes will be contrarily carried out. For example, the holdingportion 244 of thecam member 240 is turned (e.g. anticlockwise) so as to loosen the terminatingfiber 204. In addition, if the terminatingfiber 204 is not a symmetrical circle of 360 degrees (e.g. the terminatingfiber 204 is a polarizing fiber), thecam member 240 can be turned to the necessary angle. - Referring to FIG 11 a, the
cam member 240 further includes asheet element 280. After the terminatingfiber 204 is inserted into the spaces of the bottom 254, 256 of theU-shaped groove 252, thesheet element 280 is put in theU-shaped groove 252 and contacts the terminatingfiber 204. Then, the holdingportion 244 of thecam member 240 is turned so as to drive thecylindrical portion 242 to be turned. Specifically, the cam effect causes twosides 272 of theU-shaped groove 252 of thecam member 240 to generate a clamping force so as to clamp the terminatingfiber 204 and thesheet element 280. Thesheet element 280 can be adapted to effectively mount the terminatingfiber 204 in the optical fiber connector, and prevents the terminatingfiber 204 from moving. The size of thesheet element 280 is not bigger than the size of theU-shaped groove 252. For example, before the holdingportion 244 of thecam member 240 is turned, the thickness of thesheet element 280 is not bigger than the distance between the twosides 272 of theU-shaped groove 252, the length of thesheet element 280 is not bigger than the length of theU-shaped groove 252, and the width of thesheet element 280 is not bigger than the difference between the depth of theU-shaped groove 252 and the diameter of the terminatingfiber 204. Preferably, the thickness of thesheet element 280 is equal to a half of the distance between the twosides 272 of theU-shaped groove 252. - Otherwise, referring to
FIG. 11 b, in an alternative embodiment, the width of thesheet element 280 is bigger than the difference between the depth of theU-shaped groove 252 and the diameter of the terminatingfiber 204. When thecylindrical portion 242 of thecam member 240 is turned, theinner wall 278 of thehollow housing 220 compresses thesheet element 280 and thus another cam effect (i.e. the second cam effect) between thehollow housing 220 and thecam member 240 is generated. The second cam effect also causes thesheet element 280 to generate a clamping force so as to clamp the terminatingfiber 204. Furthermore, in another alternative embodiment, the present invention can independently provide the second cam effect by only using thesheet element 280 without thesecond protrusion 248, thereby clamping the terminatingfiber 204. - Referring to
FIG. 12 , it depicts a clampingassembly 211′ according to an alternative embodiment of the present invention. The clampingassembly 211′ is substantially similar to the clampingassembly 211, wherein the similar elements are designated with the similar reference numerals. The clampingassembly 211′ includes ahollow housing 220′ and acam member 240′. The difference between the clampingassembly 211′ and the clampingassembly 211 is that thecam member 240′ includes a throughgroove 252′ rather than aU-shaped groove 252. The throughgroove 252′ passes through all volumes of thecylindrical portion 242′ and the holding portion (not shown), respectively. In other words, thecylindrical portion 242′ and the holding portion are constituted by afirst portion 243 a and asecond portion 243 b. The space of theintermediate region 254′ of the throughgroove 252′ is equal to or slightly bigger than the volume of the terminatingfiber 204, whereby the throughgroove 252′ accommodates the terminatingfiber 204 during installation. More detailed, the champing and assembling processes of the clampingassembly 211′ is substantially similar to those of the clampingassembly 211 in the field. - According to the optical fiber connector of the present invention, it is easy to rework for the terminating fiber disclosed in the present invention. Once the installation of the terminating fiber is wrong, the terminating fiber can be pulled out from the optical fiber connector by a hand with/without a tool. Compared with the prior art, the clamping assembly of the present invention is a simple structure and is easily used.
- Referring to
FIG. 6 again, theresilient member 215, e.g. spring, is disposed in theconnector housing 212, and encloses thehollow housing 220. Theinsert member 216 is disposed in therear end 276 of the connector housing 212 (e.g. a part of theinsert member 216 is screwedly mounted in therear end 276 of the connector housing 212), and exposes out a part of the clamping assembly (i.e. the holdingportion 244 of the cam member 240), wherein during assembly of the optical fiber connector theresilient member 215 can press to bias theferrule 213 and the clampingassembly 211 forward so as to finish theoptical fiber connector 210. - In addition, if the
optical fiber connector 210 is a small form factor, factory-installable optical fiber connector, theferrule 213 of theoptical fiber connector 210 is not provided with thefiber stub 214. In other words, the terminatingfiber 204 of the factory-installable optical fiber connector will be extended to the original location of thefiber stub 214 of the field-installable optical fiber connector. Thus, the method for assembling the small form factor, factory-installable optical fiber connector has no step adapted for optically coupling the terminatingfiber 204 to thefiber stub 214. - Although the invention has been explained in relation to its preferred embodiment, it is not used to limit the invention. It is to be understood that many other possible modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (27)
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US11/869,542 US7513695B1 (en) | 2007-10-09 | 2007-10-09 | Small form factor, field-installable optical fiber connector |
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US11/869,542 US7513695B1 (en) | 2007-10-09 | 2007-10-09 | Small form factor, field-installable optical fiber connector |
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US20090092360A1 true US20090092360A1 (en) | 2009-04-09 |
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