JP4255803B2 - Optical connector - Google Patents

Description

  The present invention relates to an optical connector that can be easily connected to an optical fiber at the site or the like to easily achieve connector termination of the optical fiber.

  As a conventional technique related to optical fiber connector termination or the like installed in a building or a house, there is, for example, Patent Document 1. The technique (optical outlet) described in Patent Document 1 includes a box into which an optical fiber cable (first optical fiber cable) is drawn, an optical connector adapter attached to the box via a mounting frame, and an optical connector adapter. A light having a cover that covers from the outside, and is terminated (connector terminated) so that the optical fiber cable and one end can be connected to a connector by an optical connector (optical connector plug) connected to the optical connector adapter. The optical fiber cable is connected to the other end of a fiber cable (second optical fiber cable; hereinafter referred to as an optical fiber with a connector) and the optical connector plug of the optical fiber with the connector is connected to the optical connector adapter. Connector termination by the optical connector at the tip (one end) of the attached optical fiber, and this optical fiber Optic cabling and mounting of the connector termination to an optical connector (optical connector of the connector-equipped optical fiber) is being implemented.

  By the way, in the technique described in Patent Document 1 described above, an optical fiber cable drawn into a box and an optical fiber with a connector are connected by an optical connector (specifically, an MT optical connector). In addition to this, it is necessary to assemble an optical connector at the tip of the optical fiber cable drawn into the box. For this reason, when an optical fiber cable without an optical connector is used as the optical fiber cable to be drawn into the box, it is necessary to attach the connector at the site, which takes much time for assembly.

  As a technology that makes it easy to attach connectors to optical fibers that are not terminated with connectors and to mount optical connectors attached to the tips of optical fibers to the outlets. Using optical connectors (field-attached optical connectors) that can be used, (b) optical fibers that have been fused with optical connectors in advance (fibers with connectors) However, the fusion splicing in (b) requires the labor of carrying in the fusing machine and the extra length processing after the connection, whereas the technique (a) requires such a labor. Since it is unnecessary, it has been rapidly spreading in recent years.

FIG. 6 shows an example of an optical connector outlet to which the field-attached optical connector (a) is applied.
6, reference numeral 101 denotes an optical connector outlet, 102 denotes an outer case of the optical connector outlet 101, 103 denotes a wall (a wall of a structure such as a building) to which the optical connector outlet 101 is attached, and 104 denotes an outer case 102. This is an optical connector receptacle provided on the front side (left side in FIG. 6).
In FIG. 6, an optical fiber 105 drawn from a wall 103 is drawn into the outer case 102 of the optical connector outlet 101. The tip of the optical fiber 105 is terminated by an on-site optical connector 106 (described later). This on-site optical connector 106 is incorporated in an optical connector receptacle 104, and an optical fiber (hereinafter referred to as an external optical fiber) tip is separately connected to the optical connector receptacle 104 from the outside of the optical connector outlet 101. When the optical connector is inserted and connected, the optical fiber 105 and the external optical fiber are optically connected by connecting the optical connectors in the optical connector receptacle 104.

Here, as disclosed in, for example, Patent Document 2, the optical connector 106 is a pair of optical fibers that are butt-connected on the rear end side of the ferrule 107 facing the joint end surface 107a side (front end side) for butt connection. A clamp unit 108 that clamps and fixes the fiber between the half-structured elements is provided.
As shown in FIGS. 7 and 8, the clamp portion 108 has a configuration in which a plurality of members are assembled to an extending portion 107 c extending from the flange portion 107 b of the ferrule 107 toward the rear end side of the optical connector 106. Hereinafter, the ferrule 107 in which the clamp portion 108 is assembled may be referred to as a ferrule 131 with a clamp portion.
The clamp part 108 includes an extension part 107c extending from the flange part 107b of the ferrule 107 and lid-side elements 116 and 117 arranged on the mating surface 111 of the extension part (hereinafter referred to as element) 107c. The sleeve-shaped springs 114a and 114b (C-shaped springs) are housed inside. The extending portion 107c constitutes one of the half elements constituting the clamp portion 108, that is, the two lid-side elements 116 and 117 constitute the other half element (element 118) constituting the clamp portion 108. The clamp unit 108 is configured to clamp and fix the optical fiber between the pair of halves 107c and 118. The two lid-side elements 116 and 117 are arranged in the front-rear direction of the optical connector 106 so that one (element 116) is closer to the ferrule 107 than the other (element 117). The spring 114 causes the elasticity of the spring 114 to act on the two lid-side elements 116 and 117 separately by a slit 119 formed in the spring 114 near the boundary between the two lid-side elements 116 and 117. It has become. However, the set of one lid side element 116 and the extension portion 107c and the set of the other lid side element 117 and the extension portion 107c can also function as independent clamp portions.

When connecting the optical fiber 105, as shown in FIG. 6, the elements 107c and 118 are opened using a wedge, and the optical fiber 105 inserted between the elements 107c and 118 is fixed internally to the ferrule 107 in advance. After the optical fiber 105 is connected to the portion extending from the ferrule 107 to the clamp portion 108, the wedge is pulled out from the element and the elements 107c and 118 are closed to clamp and fix the optical fiber 105 in the connected state. To maintain the connection status. The optical fiber 105 inserted between the elements 107c and 118 is precisely positioned and aligned by positioning grooves (such as V-grooves) formed on the mating surfaces of the elements 107c and 118 having a halved structure. Low loss can be achieved when butt-connected.
Japanese Patent Laid-Open No. 6-201953 JP 2001-235655 A

  However, in the optical connector 106 as described above, it is difficult to reduce the dimension in the axial direction (the direction in which the microholes extend) due to the protruding dimension of the clamp portion 108 from the ferrule 107, which becomes an obstacle to the reduction in the mounting space. It was. Further, in the optical connector outlet 101 as described above, in order to secure a storage space for the field-attached optical connector 106 in the exterior case 102, the depth dimension of the exterior case 102 must be increased, and the exterior case 102 is reduced in size. There was dissatisfaction that it was not possible. In addition, the optical fiber 105 drawn into the outer case 102 needs to be housed in the outer case 102 with an allowable bending that does not affect the optical transmission characteristics. In addition, it is necessary to ensure a sufficient bending space of the optical fiber 105 in the vicinity of the protruding end of the clamp portion 108 from the ferrule 107, and to gently bend the optical fiber 105, and it is difficult to reduce the depth dimension of the outer case 102. In this respect, it is difficult to reduce the size of the outer case 102.

  The present invention has been made in consideration of such circumstances, and its object is to realize (a) reduction in dimensions, particularly in the axial direction (extending direction of the micropores). (B) To provide an optical connector capable of improving the workability of attaching an optical fiber terminated with a connection to a built-in optical fiber.

In order to achieve the above object, the present invention proposes the following means.
The invention according to claim 1 is directed to a ferrule in which a minute hole is formed, a built-in optical fiber preliminarily provided on a joining end surface side of the minute hole of the ferrule, a housing that accommodates the ferrule, and the joining of the ferrule. A clamp portion that clamps and fixes the optical fiber inserted into the fine hole from the rear end side facing the end surface; and a fixing means that fixes the coating portion of the optical fiber, and the built-in optical fiber includes the ferrule as a range of up to the middle of the joint end face or al the micropores being furnished fixed to the micropores, the micropores, the optical fiber inserted from the extending direction of the central axis of the micropores The fixing means is abutting and connected to the built-in optical fiber in the fine hole, and the fixing means is a pressing member provided at a rear end portion of the housing, and a shaft portion. And a clamp part receiving hole that receives the clamp part by being spaced from the pressing member by a pivotal support that is pivotally supported and pivoted around the shaft part. Each of the pressing members) is provided with a curved surface for securing a bending radius greater than an allowable bending radius of the optical fiber. the covering portion of the along the optical fiber was characterized that you clamping.

  According to the optical connector of the present invention, the built-in optical fiber and the optical fiber are connected in the fine hole of the ferrule accommodated in the housing, and the coating portion of the optical fiber is fixed by the fixing means. Thereby, the insertion state of the optical fiber tip with respect to the fine hole is maintained, and the connection state between the built-in optical fiber and the optical fiber can be maintained. For this reason, it is not necessary to provide a connection mechanism (clamp with alignment mechanism) that clamps the built-in optical fiber and the optical fiber butt-connected to the built-in optical fiber to maintain the connection state.

Further , according to the optical connector of the present invention, the optical fiber covering portion is inserted along the curved surface, and the curved portion and the optical fiber covering portion are clamped and fixed, so that the optical fiber is firmly fixed. Can do. In addition, since the curved surface is curved more than the allowable bending radius, it does not affect or adversely affect the optical transmission characteristics of the optical fiber.

According to a second aspect of the present invention, in the optical connector according to the first aspect, the curved surface is formed to bend in a different direction from the optical axis direction of the optical fiber, and the rear end side of the optical fiber is It is characterized by bending in a direction different from the optical axis direction.
According to the optical connector of the present invention, the optical fiber (pigtail) extending from the fixing means is drawn out in a direction inclined with respect to the axial direction of the fine hole. For this reason, even when there is not enough space on the rear end side of the optical connector (side facing the joining end surface of the ferrule), it is possible to easily realize the routing of the optical fiber extending from the rear end of the optical connector.

According to a third aspect of the present invention, in the optical connector according to the first or second aspect, the housing has an optical connector receiving hole into which an optical connector to be connected while being opposed to the joining end surface of the ferrule is inserted. It is characterized by.
The optical connector according to the present invention is one in which another optical connector is inserted into the optical connector housing hole and connected to the built-in optical fiber. For example, an optical connector into which a connector plug is inserted and connected as the other optical connector Can function as a receptacle or the like.

According to the present invention, since the connection between the built-in optical fiber and the optical fiber is performed in the fine hole formed in the ferrule as in the prior art, there is no need to provide a connection mechanism. Therefore, since the optical connector can be downsized, the connection workability can be ensured even in a narrow installation place.
Further, the connecting operation between the built-in optical fiber and the optical fiber can be easily performed because the optical fiber is simply fixed by the fixing means after the optical fiber is inserted into the ferrule and abutted against the built-in optical fiber.
Furthermore, the built-in optical fiber housed in the range from the joining end face of the ferrule to the middle of the fine hole and restrained from being displaced by the inner face of the fine hole was inserted into the fine hole from the rear end side of the ferrule. Since the optical fiber is abutted, the inconvenience of inadvertently bending or breaking the built-in optical fiber due to the pressing force at the butt connection can be avoided.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the optical connector 1 includes a ferrule 2 with a built-in optical fiber 6 fixed in advance, a clamp portion 3 that clamps and fixes the optical fiber 7, and a fixing portion that clamps and fixes the optical fiber 7. (Fixing means) 4 and a housing 5 in which the ferrule 2 and the clamp part 3 are housed. A fine hole 9 is formed in the ferrule 2, and one end of the fine hole 9 is opened in the joining end surface 2 a, and the other end is opened in the rear end facing the joining end surface 2 a of the ferrule 2. . The clamp part 3 has a configuration in which a plurality of members are assembled on the rear end side of the ferrule 2. Hereinafter, the ferrule 2 in which the clamp part 3 is assembled may be described as a “ferrule 2A with a clamp part”. The housing 5 has an optical connector housing hole 11 for inserting and housing the optical connector 13 (optical connector plug) shown in FIG. 5 which is disposed so as to be opposed to and connected to the joining end surface 2a of the ferrule 2, and the optical connector receptacle. It functions as. In this embodiment, the left side in FIGS. 1 and 2 will be described as the front, and the right side will be described as the rear.

  The optical connector 1 is an optical connector receptacle to which an SC-type optical connector plug (SC: Single fiber Coupling) defined by JIS C 5973 is inserted and connected as an optical connector (optical connector plug). It is. The optical connector 1 has a configuration in which the optical fiber 7 extending from the housing 5 is protected by an elastomer (rubber or the like) boot attached to the rear end portion of the housing 5.

  As shown in FIG. 2, the ferrule 2 is a sleeve made of a hard material such as ceramics such as zirconia or glass, and is inserted into a ferrule housing hole 12 formed in the housing 5. The housing 5 is configured to receive the clamp portion 3 in a clamp portion receiving hole 14 having a shape in which one end of the optical connector receiving hole 11 is expanded, and the ferrule 2A with a clamp portion is disposed on the rear side of the housing 5. The ferrule 2 is inserted into the ferrule accommodation hole 12 through the opening 14 a of the clamp portion accommodation hole 14 that opens, and the clamp portion 3 is accommodated in the clamp portion accommodation hole 14. Here, engaging claws (elastic claws) 34 are formed on opposite sides of the housing 5 in the vicinity of the opening 14a. The engaging claws 34 clamp the inserted ferrule 2A with a clamp portion. When inserted into the accommodation hole 14, it is pushed open, and when the insertion is completed, the rear end of the ferrule 2A with a clamp portion is locked by elasticity. Thereby, the ferrule 2A with a clamp part can be firmly fixed, and wobble can be prevented.

  The optical connector housing hole 11 has a configuration in which the other end of the ferrule housing hole 12 is expanded, and the ferrule 13a of the optical connector 13 inserted into the optical connector housing hole 11 is inserted into the ferrule housing hole 12 and the ferrule housing hole is inserted. 12, the ferrule 2 of the ferrule 2A with a clamp part is butt-connected. Here, the ferrule housing hole 12 functions as a means for positioning and aligning the ferrules 2 and 13a so that they can be connected to each other. However, for example, a configuration in which a positioning sleeve for the ferrules 2 and 13a is separately incorporated may be employed. Here, the built-in optical fiber 6 housed in the ferrule 2 is a bare optical fiber, and is internally fixed to the fine hole 9 so as to reach the middle of the fine hole 9.

The clamp part 3 is comprised from the elements 21 and 22 of a split structure, and the U-shaped spring member 23 with which these elements 21 and 22 are mounted | worn and clamped so that these may be inserted | pinched. Here, the elements 21 and 22 are integrated into a prismatic shape by clamping with the clamping force of the spring member 23. The elements 21 and 22 may have various cross-sectional shapes such as a cylindrical shape (each element divided in half is a semicircular cross section). Also, the spring member 23 can be of various configurations, such as a C-shaped member.
One of the pair of elements 21 and 22 (here, element 22) is fixed to the ferrule 2. Here, the elements 21 and 22 are plastic members. Specifically, the element 22 has an extending portion 24 formed so as to avoid a portion overlapping with the element 21, and the extending portion 24. Is fixed to the ferrule 2 by being molded into a fixing protrusion 31 protruding from the rear end of the ferrule 2.

  As shown in FIG. 3, a semicircular round groove 21 b is formed on the mating surface 21 a of the element 21, and a V-groove 22 b is formed on the mating surface 22 of the element 22. The mating surfaces 21a and 22a are overlapped, and the round groove 21b and the V-groove 22b are matched to form a positioning groove 26 that positions and aligns the optical fiber 7. Here, the positioning groove 26 is formed on both sides of the element 21 and the element 22, but the present invention is not limited to this, and the positioning groove 26 is formed only on one of the pair of elements 21 and 22. It is also possible to adopt a configuration comprising a groove. The cross-sectional shape of the positioning groove 26 is not limited to the above shape, and may be a V-groove, U-groove, round groove (groove with a semicircular cross section), or the like.

  A tapered hole 32 for guiding the optical fiber 7 to the minute hole 9 is formed in the extending part 31 of the ferrule 2 and is inserted into the positioning groove 26 of the clamp part 3 from the rear end side of the optical connector 1. Thus, the optical fiber 7 penetrating the clamp portion 3 can be smoothly pushed into the fine hole 9.

  The optical fiber 7 is an optical fiber that is optically connected to the built-in optical fiber 6 housed in the ferrule 2 in the fine hole 9, and here, an optical fiber cable having a structure in which the optical fiber core wire 7b is housed in an outer sheath. 7c (covering part) is used. The optical fiber 7 that is optically connected to the built-in optical fiber 6 and terminated by the optical connector 1 is not limited to an optical fiber cable, and an optical fiber strand is used depending on the configuration of the ferrule 2 and the like. Various single-core or multi-core optical fibers such as multi-core optical fiber ribbons can be employed.

  Further, as shown in FIG. 3, a wedge insertion hole 29 for inserting the tip protrusion 28 of the wedge 27 is formed at one side edge of the mating surfaces 21a and 22a on which the element 21 and the element 22 are overlapped. The housing 5 is formed with a wedge insertion window 30 for inserting the wedge 27 into the clamp portion 3 from the outside of the housing 5. The clamp portion 3 can push the elements 21 and 22 against the clamping force of the spring member 23 by press-fitting the wedge 28 into the wedge insertion groove 29 from the wedge insertion window 30. When the wedge 28 is removed from the wedge insertion groove 29, the space between the elements 21 and 22 can be closed, and the state can be brought into an integrated state by clamping with the clamping force of the spring member 23 again.

  As shown in FIGS. 1 and 2, on the rear side (right side in FIG. 2) of the opening 14 a of the clamp portion accommodation hole 14, there is a fixing portion 4 that clamps and fixes the optical fiber 7 whose tip is inserted into the optical connector 1. Is provided. The fixing portion 4 includes a pressing member 41 projecting from the rear end portion of the housing 5 and a pressing member 42 pivotally supported by a shaft portion 43. As shown in FIG. 5, the holding member 42 is rotated around the shaft portion 43, and as shown in FIG. 5, the holding member 42 is spaced from the holding member 41 and interferes with the insertion of the optical fiber 7 into the housing 5. In order to prevent this, it is possible to switch the retracted position (the position in FIG. 4) where the opening 14a is exposed. In addition, the holding member 41 is formed with a curved surface 41a that is curved from the axial direction of the fine hole 9 with a radius that is equal to or larger than the allowable bending radius of the optical fiber 7, and is substantially orthogonal to the axial direction. When the pressing member 42 is rotated to sandwich the optical fiber 7, the optical fiber 7 is bent and fixed along the curved surface 14 a of the pressing member 41. Here, the optical fiber 7 is sandwiched between the curved surfaces 41a and 42a formed on the pressing members 41 and 42, that is, the optical fiber 7 is formed between the two curved surfaces 41a and 42a. The clamp is fixed between the presser member 41 and the presser member 42 in a state of being accommodated in the presser groove 47. One end of the pressing groove 47 faces the opening 14a and is opened with an axis in a direction deviated from the extension of the central axis of the fine hole 9. However, the fixing groove 4 (specifically, the fixing portion 4) The drawing direction of the optical fiber 7 from the holding groove 47) is a direction deviated from the axial direction of the fine hole 9, in this case, substantially perpendicular to the axial direction of the fine hole 9. One of the two may be changed to an uneven portion. Further, the bending direction of the curved surfaces 41 a and 42 a is not limited to the above-described form, and may be a direction shifted from the axial direction of the microhole 9. The cross-sectional shape of the pressing groove 47 is, for example, a round groove (a semicircular cross-sectional groove), but may be a V groove, a U groove, or the like.

  Reference numeral 44 denotes a bearing portion 44 that is fitted to the shaft portion 43 in the pressing member 41. The pressing member 41 includes an engagement hole 45, and the pressing member 42 includes an engagement pin 46. When the pressing member 42 rotates, the engaging pin 46 and the engaging hole 45 are engaged, and the pressing member 42 is fixed at the clamp position.

  As the optical connector 1, the wedge 28 is inserted between the elements 21 and 22 in advance, and the optical fiber 7 (specifically, the optical fiber core wire 7 b) can be inserted into the positioning groove 26. Can also be adopted. In this case, since the optical fiber 7 can be easily fixed by pulling out the wedge 28 from between the elements 21 and 22, there is no need to insert the wedge 28 into the clamp portion 2 at the site.

  In the optical connector 1 having the above configuration, when the built-in optical connector and the optical connector are attached, as shown in FIG. 3B, the elements 21 and 22 are first opened using the opening member 27, As shown in FIG. 1, the optical fiber 7 is inserted into the positioning groove 26 from the rear end side of the optical connector 1, and the optical fiber 7 (specifically, the optical fiber core led out to the tip of the optical fiber 7). The optical fiber 7 (specifically, the optical fiber core wire 7b) is exposed in advance to the bare optical fiber 7a, and the built-in optical fiber 6 is embedded in advance. The end of the bare optical fiber 7a is abutted and connected to the built-in optical fiber 6 (see FIG. 4). Thus, the built-in optical fiber 6 and the optical fiber 7 can be optically connected.

  Thereafter, the optical fiber 7 is fixed by the fixing portion 4. That is, the pressing member 42 is rotated about the shaft 43 in the rotation direction T, and the optical fiber cable 7c of the optical fiber 7 is sandwiched between the curved surfaces 41a and 42a as shown in FIG. The sandwiched optical fiber cable 7c is engaged with an engagement hole 45 formed in the pressing member 41 and an engagement pin 46 provided in the pressing member 42, and a clamping force is generated, whereby the curved surfaces 41a and 42a. Curved and fixed. At this time, it is possible to secure a slight deflection in the optical fiber core wire 7b, and to apply a butt force against the built-in optical fiber 6 to the optical fiber 7 (the optical fiber core wire 7b and the bare optical fiber 7a) by this deflection. is there.

  After the optical fiber cable 7c of the optical fiber 7 is fixed by the fixing part 4, the release member 27 press-fitted into the wedge insertion groove 29 of the clamp part 2 is pulled out. Then, the opened positioning groove 26 is closed by the elastic force of the spring member 23, and the optical fiber core wire 7b sandwiched between the round groove 21b and the V groove 22b is firmly clamped. become.

  According to the above configuration, the built-in optical fiber 6 and the optical fiber 7 are optically connected in the fine hole 9 of the ferrule 2, and the optical fiber 7 is fixed by the clamp part 3 and the fixing part 4. The connection state between the optical fiber 7 and the optical fiber 7 is maintained. As a result, the optical connector 1 having the above-described configuration is, as in the prior art (see FIG. 7), the elements (107b and 116 in FIG. 7) for optically connecting the clamp portions (108 in FIG. 7) and the optical fiber (FIG. 7). 105) is divided into the elements (107b and 113 in FIG. 7) for fixing the optical fiber core wire, and it is not necessary to clamp and fix each of them, so that it is shortened compared with the conventional optical connector (106 in FIG. 7). Can do. Therefore, since the optical connector 1 having the above configuration can be reduced in size, connection workability can be ensured even in a narrow installation place.

  In the embodiment of the above configuration, the configuration in which the clamp portion 3 for fixing the optical fiber core wire 7b of the optical fiber 7 is provided between the ferrule 2 is illustrated, but the present invention is not limited to this. Alternatively, a configuration in which the installation of the clamp unit 3 is omitted can be employed. Even if the clamp part 3 is omitted, the optical fiber 7 is fixed by the fixing part 4, so that the built-in optical fiber 6 and the optical fiber 7 in the fine hole 9 of the ferrule 2 (in the above-described embodiment, the bare optical fiber 7a). ) Can be prevented from being affected by the tensile force acting on the optical fiber 7 and the connection state can be maintained safely. Moreover, since the clamp part 3 is omitted, the length (axial dimension) of the optical connector 1 can be shortened accordingly. Therefore, the optical connector 1 can be downsized. As a result, connection workability can be ensured even in a narrow installation place. Also, the connecting operation between the built-in optical fiber 6 and the optical fiber 7 is only to fix the optical fiber 7 by the fixing portion 4 after inserting the optical fiber 7 into the ferrule 2 and making it face the built-in optical fiber 6. Therefore, connection work can be performed easily. Therefore, attachment workability can be improved.

The present invention can also be applied to an optical connector in which a plurality of optical fiber accommodation holes are formed in a ferrule and a built-in optical fiber is housed in each of the optical fiber accommodation holes. In this case, if there are at least as many aligning grooves such as positioning grooves provided in the clamp portion as the number of built-in optical fibers, each of the optical fibers terminated by the optical connector is connected to the built-in optical fiber by the aligning groove. It can be optically connected to the fiber. As such an optical connector, for example, an optical connector whose ferrule is an MT type optical connector ferrule (MT: Mechanically Transferable) defined in JIS C 5981 or the like is exemplified.
The present invention can also be applied to a plug by changing the housing shape.

It is a figure which shows the optical connector and optical fiber which concern on one Embodiment of this invention. It is a figure which shows the principal part of the optical connector which concerns on one Embodiment of this invention. It is sectional drawing which shows the clamp part of the optical connector of FIG. 1, (a) is before sectional insertion of a wedge, (b) is sectional drawing after wedge insertion. It is the figure which inserted the optical fiber in the optical connector which concerns on one Embodiment of this invention. It is the figure which inserted the optical fiber in the optical connector which concerns on one Embodiment of this invention, and was fixed by the fixing | fixed part. It is sectional drawing which shows the outlet of a prior art example. It is sectional drawing of the ferrule built into the optical connector of a prior art example, and a clamp part. It is a perspective view of the ferrule built in the optical connector of a prior art example, and a clamp part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical connector, 2 ... Ferrule, 3 ... Clamp part, 4 ... Fixing part (fixing means), 5 ... Housing, 6 ... Built-in optical fiber, 7 ... Optical fiber, 7c ... Optical fiber cable (covering part), 9 ... Micropore

Claims (3)

A ferrule (2) in which micropores (9) are formed;
A built-in optical fiber (6) preliminarily embedded in the joint end face (2a) side of the fine hole of the ferrule;
A housing (5) for housing the ferrule;
A clamp portion (3) for clamping and fixing an optical fiber (7) to be inserted into the fine hole from the rear end side facing the joining end face of the ferrule;
And a fixing means (4) for fixing the coating portion (7c) of the optical fiber,
The built-in optical fiber is internally fixed to the microhole so as to be in the range from the joining end surface (2a) of the ferrule to the middle of the microhole, and the microhole has a center axis line of the microhole. The optical fiber inserted from the extension direction is abutted and connected to the built-in optical fiber in the fine hole,
The fixing means is pivotally supported around a pressing member (41) and a shaft portion (43) provided at the rear end portion of the housing, and by rotating around the shaft portion, Switching between a clamp position for sandwiching the optical fiber covering portion and a retreat position for exposing the opening (14a) of the clamp portion accommodation hole (14) for accommodating the clamp portion apart from the pressing member (41). The pressing member (42) is configured by a curved surface (41a, 42a) for securing a bending radius equal to or larger than an allowable bending radius of the optical fiber. optical connector which is characterized that you clamping the covering portion of the optical fiber along a (1). The optical connector according to claim 1 ,
The curved surface is formed so as to bend in a different direction from the axial direction of the microhole, and the fixing means bends and fixes the optical fiber in a direction shifted from the axial direction of the microhole. Optical connector. The optical connector according to claim 1 or 2 ,
The optical connector is characterized in that the housing has an optical connector receiving hole (11) into which an optical connector (13) connected so as to face the joining end face of the ferrule is inserted.

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