WO2019193893A1 - Clamp member, optical connector and method of manufacturing optical connector - Google Patents

Abstract

[Problem] To fix a tensile member of an optical cable and a housing of an optical connector in a simple manner. [Solution] A clamp member of the present disclosure is fixed to an end of an optical cable having an optical fiber and a tensile member, and is fixed to and accommodated in an outer housing of an optical connector. The clamp member includes a main body and a retaining nut. The main body has a fiber insertion hole through which the optical fiber is inserted, a tensile member groove for arranging the tensile member, and a male screw portion. The retaining nut has a female screw portion fitted on the male screw portion of the main body, and fixes the tensile body to the main body portion by being fitted to the main body.

Description

Clamp member, optical connector, and optical connector manufacturing method

The present invention relates to a clamp member, an optical connector, and an optical connector manufacturing method.

Patent Documents 1 to 3 describe bonding an optical cable strength member and a predetermined part (for example, a housing) of an optical connector in order to fix the optical cable to the optical connector.

US 7090406 JP 2008-52236 A JP 2016-164598 A

When fixing the tensile body of the optical cable and the housing of the optical connector with an adhesive, facilities such as a heater and an ultraviolet irradiation device for curing the adhesive are required. Moreover, in order to ensure a stable adhesive force, it is necessary to manage the curing conditions of the adhesive. For these reasons, it is required to fix the tensile member of the optical cable and the housing of the optical connector by a simple method without using an adhesive.

An object of the present invention is to easily fix a tensile body of an optical cable and a housing of an optical connector.

The main invention for achieving the above object is:
A clamp member that is fixed to an end portion of an optical cable having an optical fiber and a tensile body, and is fixed and accommodated in an external housing of the optical connector,
A fiber insertion hole through which the optical fiber is inserted, a tensile strength body groove in which the tensile strength body is disposed, and a main body portion having a male screw portion;
A clamp having a female screw portion that fits into the male screw portion of the main body portion, and a retaining nut that fixes the strength member to the main body portion by fitting into the main body portion. It is a member.

Other features of the present invention will be made clear by the description and drawings described later.

According to the present invention, the tensile member of the optical cable and the housing of the optical connector can be easily fixed.

FIG. 1A is a perspective view of the optical connector 100. FIG. 1B is an exploded view of the optical connector 100. FIG. 2 is a cross-sectional view of the optical connector 100. 3A and 3B are explanatory views of the main body portion 11 of the clamp member 10. 4A and 4B are explanatory views of the clamp member 10. FIG. 3 is a perspective view of a state before the main body portion 11 and the retaining nut 13 are fitted together. FIG. 4B is a perspective view of the state after fitting. FIG. 5A is a view of the main body 11 of FIG. 4A (or FIG. 3B) viewed from the front side. FIG. 5B is a view of the clamp member 10 of FIG. 4B as viewed from the front side. FIG. 6 is an explanatory diagram of a fastening tool 60 used for fastening the main body 11 and the retaining nut 13. 7A to 7D are explanatory views showing a state in which the connector unit 20 is attached. FIG. 8 is an explanatory diagram of a state when the optical connector 100 is assembled. FIG. 9 is a cross-sectional view of the vicinity of the rear protection unit 40. 10A and 10B are explanatory views of the clamp member 10 of the second embodiment.

(1)
At least the following matters will be apparent from the description and drawings described below.

A clamp member that is fixed to an end portion of an optical cable having an optical fiber and a tensile body, and is fixed and accommodated in an external housing of the optical connector,
A fiber insertion hole through which the optical fiber is inserted, a tensile strength body groove in which the tensile strength body is disposed, and a main body portion having a male screw portion;
A clamp having a female screw portion that fits into the male screw portion of the main body portion, and a retaining nut that fixes the strength member to the main body portion by fitting into the main body portion. The member becomes clear. According to such a clamp member, the strength member of the optical cable and the housing of the optical connector can be easily fixed.

The main body has an interposition member, and the interposition member deformed by receiving a force from the retaining nut presses the strength member by fitting the retaining nut to the main body, It is desirable that the strength member is fixed to the main body. Thereby, the area which presses a tensile strength body can be enlarged, and strong retention force can be implement | achieved. However, the retaining nut may be brought into contact with the strength member without interposing any intervening member.

It is desirable that the interposition member is a cylindrical metal sleeve disposed in the strength member groove. Thus, the tensile strength body can be pressed by deforming the metal sleeve with the retaining nut in a state where the tensile strength body is inserted through the cylindrical metal sleeve.

It is desirable that the metal sleeve has a slit along the longitudinal direction. Thereby, the metal sleeve is easily deformed.

It is desirable that the metal sleeve be disposed in the strength member groove so that the slit faces the bottom surface side of the strength member groove. Thereby, breakage of the strength member can be suppressed.

It is desirable that the metal sleeve has an inclined opening. This makes it easier to fit the retaining nut to the main body.

The interposition member is a clamping member having a tapered surface and a contact surface. When the interposition member is attached to the main body portion, a side surface of the tensile strength body groove is constituted by the contact surface, and the main body portion is used for the retention. It is desirable that when the nut is fitted, the interposed member is deformed by receiving a force from the retaining nut at the tapered surface, and the contact surface presses the tensile body. Thereby, the area which presses a tensile strength body can be enlarged, and strong retention force can be implement | achieved.

An optical connector attached to an end of an optical cable having an optical fiber and a tensile body,
An outer housing;
A clamp member that is fixed to the tensile body of the optical cable and is housed by being fixed to the external housing;
The clamp member is
A fiber insertion hole through which the optical fiber is inserted, a tensile strength body groove in which the tensile strength body is disposed, and a main body portion having a male screw portion;
A light having a female screw portion that fits into the male screw portion of the main body portion, and a retaining nut that fixes the strength member to the main body portion by fitting into the main body portion. The connector becomes clear. According to such an optical connector, the strength member of the optical cable and the housing of the optical connector can be easily fixed.

A method of manufacturing an optical connector attached to an end of an optical cable having an optical fiber and a tensile body,
Inserting the optical fiber into the fiber insertion hole of the main body portion constituting the clamp member, and disposing the tensile body in the tensile body groove of the main body portion;
Fixing the tensile body to the clamp member by fitting a retaining nut to the male thread portion of the main body; and
The method for manufacturing an optical connector is characterized in that the clamp member is housed and fixed in an external housing. According to such a manufacturing method, the strength member of the optical cable and the housing of the optical connector can be easily fixed.

(2)
By the way, Patent Documents 1 to 3 describe an optical connector attached to an end of an optical cable. Such an optical connector is provided with a boot for protecting the optical cable by reducing the bending load on the optical cable.

If water enters the inside of the optical connector from the gap near the boot, the optical connector may be damaged. For this reason, it is desirable to close the gap near the boot. However, in the configuration in which the gap near the boot is waterproofed with a heat-shrinkable tube, a heater or the like is required. In addition, in the configuration in which the gap in the vicinity of the boot is waterproofed with an adhesive, it is necessary to manage the curing conditions of the adhesive. For this reason, it is desirable to realize waterproofing of the optical connector by a simple method. Also, even when waterproofing without using boots, it is desirable to protect the optical cable by reducing the bending load on the optical cable.

Therefore, at least the following matters will be apparent from the description and drawings described below.

An optical connector attached to an end of an optical cable, comprising: a housing; a fastening member fastened to the housing; and a gasket that narrows a gap by being pressed from the fastening member, and the fastening member The optical connector is characterized in that the inner wall surface is provided with a pressing portion for pressing the gasket and a curved portion facing the optical cable on the rear side of the pressing portion and the gasket. . According to such an optical connector, waterproofing and protection of the optical connector can be realized by a simple method.

It is desirable that the curvature radius of the curved portion is greater than or equal to the allowable curvature radius of the optical cable. Thereby, damage to the optical cable can be suppressed.

It is desirable that the curvature radius of the curved portion is equal to or less than the allowable curvature radius of the optical fiber of the optical cable. Thereby, size reduction of an optical connector is realizable.

It is desirable that when the fastening member is fastened to the housing, the gap between the housing and the gasket is narrowed by pressing the gasket in a direction from the fastening member toward the housing. Thereby, the water immersion from the clearance gap between the said housing and the said gasket can be suppressed.

When the fastening member is fastened to the housing, it is preferable that the gap between the gasket and the optical cable is narrowed by pressing the gasket in a direction from the fastening member toward the housing. Thereby, the water immersion from the clearance gap between the said gasket and the said optical cable can be suppressed.

The gasket has a receiving portion formed in a tapered shape, and when the fastening member is fastened to the housing, the receiving portion is pressed in a direction from the fastening member toward the housing, The gap between the housing and the gasket may be narrowed, and the gap between the gasket and the optical cable may be narrowed by pressing the receiving portion in the direction from the fastening member toward the optical cable. desirable. Thereby, it is possible to suppress water intrusion from both the gaps (the gap between the housing and the gasket and the gap between the gasket and the optical cable) by a simple method.

=== First Embodiment ===
<Basic Configuration of Optical Connector 100>
FIG. 1A is a perspective view of the optical connector 100. FIG. 1B is an exploded view of the optical connector 100. FIG. 2 is a cross-sectional view of the optical connector 100.

In the following explanation, each direction is defined as shown in the figure. That is, the connector mounting / removal direction is “front / rear direction”, the opposite optical connector side is “front”, and the opposite side is “rear”. In addition, the longitudinal direction of the optical cable 1 (or the optical fiber 3 or the strength member 5) is the front-rear direction. The major axis direction of the cross section of the flat optical cable 1 (the direction in which the two strength members 5 of the optical cable 1 are arranged) is the left-right direction, and the right hand side when viewed from the rear side toward the front side is “right”. The opposite side is “left”. A direction perpendicular to the front-rear direction and the left-right direction is referred to as “up-down direction”. The minor axis direction (thickness direction of the optical cable 1) of the cross section of the flat optical cable 1 is the vertical direction.

The optical connector 100 in the figure is a connector attached to the end of the optical cable 1, and is a connector that can be attached to and detached from a not-shown counterpart optical connector (for example, a receptacle-side optical connector). The optical connector 100 of the present embodiment is a connector that is attached to the end of the optical cable 1 processed in the field, and is called a field-assembled optical connector or a field-mounted optical connector. When the optical connector 100 is connected to an optical connector on the other side (not shown), the end surfaces of the ferrule 21 will abut against each other. As a result, the end faces of the optical fiber 3 physically hit each other, and the optical fiber 3 is optically connected. The optical cable 1 extends from the rear side of the optical connector 100. The optical cable 1 to which the optical connector 100 is attached becomes an optical cable with an optical connector.

The optical cable 1 has an optical fiber 3 and two strength members 5 (see FIG. 1B). Here, the optical fiber 3 is accommodated in a tube cable 2 in which a tube is filled with gel. The tube cable 2 accommodates one optical fiber 3, but it is also possible to accommodate a plurality of optical fibers 3. Moreover, the optical fiber 3 may be directly accommodated in the jacket 7 of the optical cable 1 without using a tube. The two strength members 5 are arranged so as to sandwich the optical fiber 3 (tube cable 2). For this reason, the cross section of the optical cable 1 configured by covering the optical fiber 3 (tube cable 2) and the two strength members 5 with the jacket 7 is flat. In the optical cable 1, a member (for example, a lip cord or a water absorbing yarn) other than the optical fiber 3 and the tensile body 5 may be accommodated in the outer jacket 7.

The optical connector 100 includes a clamp member 10, a connector unit 20, a coupling unit 30, an applying mechanism 35, and a rear protection unit 40.

The clamp member 10 is a housing attached to the end of the optical cable 1. Since the clamp member 10 is a housing that is fixed to the end portion of the optical cable 1, it may be called a fixing housing. The clamp member 10 includes a main body 11 and a retaining nut 13. The main body 11 has a fiber insertion hole 11A and a strength member groove 11B. The optical fiber 3 led out from the optical cable 1 is inserted into the fiber insertion hole 11 </ b> A of the main body portion 11, and the tensile body 5 led out from the optical cable 1 is arranged in the tensile body groove 11 </ b> B of the main body portion 11. . In the present embodiment, the tension body 13 is fastened to the main body 11 by fastening the retaining nut 13 to the main body 11, and the clamp member 10 is fixed to the end of the optical cable 1. Will be. A detailed configuration of the clamp member 10 will be described later.

The connector unit 20 includes a ferrule 21, a mechanical splice portion 23, and a connector unit housing 25. Here, the ferrule 21 is a cylindrical ferrule used for a single-core optical connector. The front end of the built-in fiber is fixed to the ferrule 21 in advance, and the built-in fiber is end-polished together with the ferrule 21. The rear end portion of the built-in fiber is disposed in the aligning groove of the mechanical splice portion 23. The mechanical splice part 23 is a member that aligns (aligns) the built-in fiber and the optical fiber 3 led out from the optical cable 1 by the mechanical splice method, and fixes the built-in fiber and the optical fiber 3 in a state of being attached together. is there. The optical fiber 3 led out from the optical cable 1 is inserted into the mechanical splice portion 23 from the rear side of the connector unit 20 and is abutted against the built-in fiber. When the insertion member 27 (see FIGS. 7A to 7C) attached to the connector unit 20 is removed with the end faces of the optical fibers 3 being in contact with each other, the optical fiber 3 is fixed by the mechanical splice portion 23. become. The connector unit housing 25 is a housing for housing a part (flange portion) of the ferrule 21 and the mechanical splice portion 23. In the present embodiment, since the built-in fiber and the optical fiber 3 can be connected by the mechanical splice method, the optical connector can be assembled by a simple assembling work at the assembly site.

The coupling unit 30 is a member that is coupled to a coupling member (coupling mechanism) of a not-shown counterpart optical connector. The coupling unit 30 includes a rotating member 31 and a front housing 33, and is configured as a bayonet type coupling mechanism. The rotating member 31 is a cylindrical member that can rotate with respect to the front housing 33, and has a locking portion for locking (hooking) the coupling member of the counterpart optical connector. The front housing 33 is a housing for housing the connector unit 20 and the applying mechanism 35. The front portion of the front housing 33 serves as an insertion portion that is inserted inside a cylindrical coupling member (not shown) of the counterpart optical connector. A male screw portion 33A (a screw thread is not shown in the drawing) is formed on the outer peripheral surface of the rear portion of the front housing 33. The male screw portion 33A is a female screw of the rear housing 42 of the rear protection unit 40. Fits with the part 42A.

The applying mechanism 35 is a mechanism that applies a rearward force to the optical connector 100 (plug-side optical connector) when the connector is connected. The applying mechanism 35 includes a movable housing 35A and a spring 35B. The movable housing 35A is a housing that is movable in the front-rear direction with respect to the ferrule 21 while accommodating the front portion of the connector unit 20 (ferrule 21) and the spring 35B. 35 A of movable housings are formed in the cylinder shape, and the end surface of the ferrule 21 is exposed from the opening of the front side. The movable housing 35A is formed with a flange, and the flange contacts the protrusion formed on the inner peripheral surface of the front housing 33, thereby preventing the movable housing 35A from being removed from the front while the connector is connected. The movable housing 35A is allowed to move rearward with respect to the front housing 33. The spring 35B is an elastic member that applies a rearward force to the optical connector 100 (plug-side optical connector) when the connector is connected. The ferrule 21 is inserted through the central cavity of the spring 35B. The spring 35B is disposed in a contracted state between the movable housing 35A and the connector unit 20, and generates a repulsive force between them. Due to the repulsive force of the spring 35B, the coupling (hooking) between the rotating member 31 of the coupling unit 30 and the coupling member (not shown) of the mating optical connector becomes strong, and the optical connector 100 is difficult to come off.

The rear protection unit 40 is a protective member that protects the rear part of the optical connector 100 and the optical cable 1. The rear protection unit 40 includes a rear housing 42, a gasket 44, and a tightening member 46. The rear housing 42 is a housing for housing the clamp member 10. A female screw portion 42A (a screw thread is not shown in the drawing) is formed on the inner peripheral surface of the front portion of the rear housing 42. The female screw portion 42A is formed on the front housing 33 of the coupling unit 30. It fits with the male screw portion 33A. The gasket 44 is a member (packing) for closing the gap. A cable insertion hole is formed in the gasket 44, and the optical cable 1 is inserted through the cable insertion hole. The tightening member 46 is a cylindrical (nut-shaped) member for fixing the gasket 44 to the rear housing 42. A male screw portion 42B (a screw thread is not shown in the drawing) is formed on the outer peripheral surface of the rear portion of the rear housing 42, and a female screw portion 46A ( In the drawing, a screw thread is not shown), and the rear portion of the rear housing 42 and the front portion of the fastening member 46 are fitted. In the present embodiment, the fastening member 46 is screwed to the rear housing 42 to narrow the gap between the rear housing 42 and the gasket 44 (in other words, the gap between the rear housing 42 and the fastening member 46). In addition, the gap between the gasket 44 and the optical cable 1 is narrowed, thereby suppressing water from entering the gap. A detailed configuration of the rear protection unit 40 will be described later.

The inner housing 51 is constituted by the clamp member 10 and the connector unit housing 25. The inner housing 51 is a housing for housing the connection portion (mechanical splice portion 23) of the optical fiber 3. A rear flange 13C (stepped portion) protruding outward is formed in the front portion (the retaining nut 13) of the clamp member 10, and a front flange protruding outward is formed in the rear portion of the connector unit housing 25. 25A is formed. By the rear side collar part 13C and the front side collar part 25A, a collar part 51A protruding outward is formed at the center of the inner housing.

Further, the front housing 33 and the rear housing 42 constitute an external housing 52. The outer housing 52 is a housing that houses the inner housing 51 (the clamp member 10 and the connector unit housing 25). When the front housing 33 and the rear housing 42 are fitted (screwed), the flange 51A of the internal housing 51 (the rear flange 13C of the clamp member 10 and the front flange 25A of the connector unit housing 25) is the front housing. The inner housing 51 (the clamp member 10 and the connector unit housing 25) is fixed inside the outer housing 52.

<Configuration and mounting method of clamp member 10>
As already described, the clamp member 10 includes the main body 11 and the retaining nut 13.

3A and 3B are explanatory views of the main body portion 11 of the clamp member 10. FIG. 3A is an exploded perspective view of the main body 11. FIG. 3B is a perspective view of a state in which the main body 11 is attached to the end of the optical cable 1.

The main body 11 is a member constituting the main body of the clamp member 10. The main body 11 includes a fiber insertion hole 11A, a pair of strength member grooves 11B, a male screw portion 11C, a flat surface portion 11D, and a protruding portion 11E. The main body 11 of the present embodiment also has a metal sleeve 12 that serves as an interposition member.

The fiber insertion hole 11A is a through hole through which the optical fiber 3 led out from the optical cable 1 is inserted. Since the optical fiber 3 bends when the optical fiber 3 is butted against the built-in fiber by the mechanical splicing method, the cross-sectional shape of the fiber insertion hole 11A is a shape extending in the vertical direction.

The tensile strength member groove 11B is a groove for placing (inserting) the tensile strength member 5 led out from the optical cable 1. The strength member groove 11B is formed on the side surface of the main body 11 along the front-rear direction. The pair of strength member grooves 11B are disposed so as to sandwich the fiber insertion hole 11A from the left and right directions. In this embodiment, the metal sleeve 12 is arrange | positioned in the groove | channel 11B for strength bodies (refer FIG. 3B). However, the metal sleeve 12 may not be disposed in the strength member groove 11B.

The depth of the strength member groove 11B is set to be smaller than the outer diameter of the metal sleeve 12. For this reason, when the metal sleeve 12 is disposed in the strength member groove 11B, the metal sleeve 12 slightly protrudes outward from the outer surface of the main body portion 11 (male screw portion 11C) (see FIG. 5A). When the metal sleeve 12 is not disposed in the strength member groove 11B, the depth of the strength member groove 11B is desirably set smaller than the diameter of the strength member 5.

The male screw portion 11 </ b> C is formed on the outer surface on the front side of the main body portion 11. As will be described later, the female screw portion 13A of the retaining nut 13 is fitted into the male screw portion 11C (see FIGS. 4A and 4B). A fiber insertion hole 11A is formed inside the male screw portion 11C so as to penetrate in the front-rear direction. In addition, on the left and right side surfaces of the male screw portion 11C, tensile strength body grooves 11B are formed along the front-rear direction so as to cross the thread of the male screw portion 11C.

The flat surface portion 11D is a flat portion used when the main body portion 11 and the retaining nut 13 are fastened. The flat portion 11D is formed on the top and bottom of the main body portion 11, respectively. As will be described later, the posture of the main body portion 11 can be regulated by sandwiching the pair of upper and lower plane portions 11D between the fastening tools 60 (see FIG. 6).

The protruding portion 11E is a portion formed to protrude rearward from the rear end portion of the main body portion 11 (clamp member 10). The protrusions 11E are formed above and below the main body 11, respectively. The pair of upper and lower protrusions 11E grips the outer sheath 7 of the flat optical cable 1 from the vertical direction (the minor diameter direction (thickness direction) of the optical cable 1). Thereby, even before tightening the retaining nut 13 (see FIG. 3B), it is possible to suppress the displacement of the main body 11 with respect to the optical cable 1 (particularly the displacement in the rotational direction).

The metal sleeve 12 is an interposed member interposed between the strength member 5 and the retaining nut 13. The metal sleeve 12 is a cylindrical member into which the strength member 5 can be inserted. The metal sleeve 12 is disposed in the strength member groove 11B. The metal sleeve 12 disposed in the strength member groove 11B slightly protrudes outward from the outer surface of the main body portion 11 (male screw portion 11C) (see FIG. 5A). In the present embodiment, as shown in FIG. 3B, the strength member 5 is disposed in the strength member groove 11 </ b> B in a state where the strength member 5 is inserted into the cylindrical metal sleeve 12.

As will be described later, when the retaining nut 13 is fitted to the main body 11, the metal sleeve 12 is deformed by receiving a force from the thread of the retaining nut 13 and presses the strength member 5. By placing the metal sleeve 12 (intervening member) between the strength member 5 and the retaining nut 13, the strength member 5 is compressed as compared with the case where the thread of the retaining nut 13 directly contacts the strength member 5. Since the area to be processed can be widened, a strong retention force can be realized.

By the way, when the strength member 5 is a glass fiber reinforced plastic (GRP), the strength member 5 may be damaged if a strong force is applied locally. On the other hand, if it is the structure which clamp | tightens the tensile strength body 5 via the metal sleeve 12 (interposition member) like this embodiment, since it can suppress that a strong force is locally applied to the tensile strength body 5, Damage can be suppressed.

The metal sleeve 12 has a flange portion 12A and an opening portion 12B. The flange portion 12 </ b> A is a flange-shaped portion formed at the rear end portion of the metal sleeve 12. The flange portion 12 </ b> A is a portion that prevents the metal sleeve 12 from slipping forward from the strength member groove 11 </ b> B. The opening 12 </ b> B is a part opened on the front side of the cylindrical metal sleeve 12. Here, the end of the strength member 5 protrudes forward of the opening 12B, but the strength member 5 does not have to protrude from the opening 12B. In the present embodiment, the opening 12B on the front side of the metal sleeve 12 is formed to be inclined. Specifically, the opening 12B is inclined so that the edge of the opening 12B is on the rear side toward the left and right outer sides. Thereby, it becomes easy to fit the retaining nut 13 to the main body 11.

In the present embodiment, the metal sleeve 12 has a C-shaped cross section. In other words, the cylindrical metal sleeve 12 is formed with slits 12C along the front-rear direction. Thereby, the metal sleeve 12 can be configured to be easily deformed. The metal sleeve 12 is arranged in the strength member groove 11B so that the slit 12C of the metal sleeve 12 faces the inner side (the bottom surface side of the strength member groove 11B). If the metal sleeve 12 is disposed in the tensile strength groove 11B so that the slit 12C faces outward, the edge of the slit 12C is sharply deformed by receiving a force from the thread of the retaining nut 13, and as a result, the slit There is a possibility that the strength member 5 may be damaged by the edge of 12C. On the other hand, in this embodiment, the metal sleeve 12 is disposed so that the slit 12C of the metal sleeve 12 faces inward, and the edge of the slit 12C of the metal sleeve 12 directly contacts the thread of the retaining nut 13. Therefore, the tensile strength body 5 can be prevented from being damaged by the deformation of the edge of the slit 12C. Further, since the metal sleeve 12 is arranged so that the slit 12C of the metal sleeve 12 faces inward, it is possible to suppress the fibers of the strength member 5 from protruding from the slit 12C. There is also an advantage that the work of fitting becomes easy.

As shown in FIG. 1B, the operator inserts the rear protection unit 40 (tightening member 46, gasket 44, rear housing 42) into the optical cable 1 in advance, and then attaches the optical fiber 3 and the strength member 5 to the outside of the optical cable 1. The end portion of the optical cable 1 is pre-processed (lead-out processing) in advance so as to protrude forward from the end portion (outlet portion) of the cover 7. Then, as shown in FIG. 3B, the operator inserts the optical fiber 3 led out from the optical cable 1 into the fiber insertion hole 11 </ b> A of the main body 11, and the tensile body 5 led out from the optical cable 1 to the main body 11. The metal sleeve 12 is inserted through the strength member groove 11B.

4A and 4B are explanatory views of the clamp member 10. FIG. 3 is a perspective view of a state before the main body portion 11 and the retaining nut 13 are fitted together. FIG. 4B is a perspective view of the state after fitting.

The retaining nut 13 is a member that fits into the main body portion 11 (the male screw portion 11C), and is a member that fixes the strength member 5 to the main body portion 11. The retaining nut 13 has a female screw portion 13A, an engaging portion 13B, a rear flange 13C, and a flat surface portion 13D.

The female screw portion 13 </ b> A is formed on the inner surface of the through hole of the retaining nut 13. Here, the female screw portion 13A is formed on the front side of the through hole of the retaining nut 13, but may be formed on the entire through hole, or may be formed on the center of the through hole or a part of the rear side. May be. The female screw portion 13A is fitted to the male screw portion 11C of the main body portion 11. The female screw portion 13 </ b> A is a portion that presses the strength member 5. In the present embodiment, the female screw portion 13A indirectly compresses the strength member 5 via the metal sleeve 12, but may contact the strength member 5 and directly compress the strength member 5.

The engaging portion 13B is a portion (groove) where the protruding portion 25B at the rear end of the connector unit housing 25 engages. The engaging portions 13B are respectively formed above and below the front end portion of the retaining nut 13. As shown in FIG. 1B, a pair of protrusions 25B are formed at the rear end of the connector unit housing 25 of the connector unit 20, and the pair of protrusions 25B sandwich the retaining nut 13 at the engaging portion 13B. Thus, the connector unit 20 can be fixed to the clamp member 10 even before the inner housing 51 is accommodated in the outer housing 52 (see FIG. 7D).

The rear flange 13C is a portion (stepped portion) protruding outward at the front portion of the retaining nut 13 (clamp member 10). The rear side flange 13 </ b> C, together with the front side flange 25 </ b> A of the connector unit housing 25, constitutes a flange 51 </ b> A that protrudes outward at the center of the inner housing 51.

The flat portion 13D is a flat portion formed on the outer surface of the retaining nut 13. The flat portions 13D are formed on the top and bottom of the retaining nut 13, respectively. As will be described later, the retaining nut 13 is fastened to the main body 11 by sandwiching the pair of upper and lower plane portions 13D between the fastening tools 60 (see FIG. 6).

FIG. 5A is a view of the main body 11 of FIG. 4A (or FIG. 3B) as viewed from the front side. FIG. 5B is a view of the clamp member 10 of FIG. 4B as viewed from the front side. In other words, FIG. 5A is a view before the retaining nut 13 is fitted to the main body 11. FIG. 5B is a view after the retaining nut 13 is fitted to the main body 11.

As shown in FIG. 5A, in a state before the retaining nut 13 is fitted to the main body portion 11, the metal sleeve 12 disposed in the strength member groove 11 </ b> B is more than the outer surface of the main body portion 11 (male screw portion 11 </ b> C). It protrudes slightly to the outside. That is, the interval X between the outer edges of the pair of metal sleeves 12 is set to be larger than the outer diameter D11 of the male screw portion 11C of the main body portion 11. The interval X corresponds to a length obtained by adding twice the diameter D12 of the metal sleeve 12 and the interval L1 between the bottom surfaces of the pair of strength member grooves 11B.

As shown in FIG. 5B, when the retaining nut 13 is fitted into the main body 11, the metal sleeve 12 is pressed and deformed by the female screw portion 13 A of the retaining nut 13, and the strength member 5 is interposed via the metal sleeve 12. Thus, the tensile strength member 5 is fixed to the main body 11 by being sandwiched between the main body 11 and the retaining nut 13. The inner diameter D13 of the retaining nut 13 is set to be smaller than the interval X. According to the clamp member 10 of the present embodiment, the strength member 5 and the clamp member 10 can be fixed without using an adhesive, which is convenient. Moreover, since the force by which the strength member 5 is pressed against the force for fastening the retaining nut 13 to the main body 11 can be increased, the clamp member 10 of the present embodiment holds the optical cable 1 with a strong retaining force. be able to.

FIG. 6 is an explanatory diagram of a fastening tool 60 used for fastening the main body 11 and the retaining nut 13.

The fastening tool 60 has a main body side tool 61 and a nut side tool 63. While the main body part 11 attached to the end of the optical cable 1 is set on the main body side tool 61, the retaining nut 13 is fastened to the main body part 11 by the nut side tool 63.

The main body side tool 61 is an elongated plate-shaped tool and has a main body restricting portion 61A. The main body restricting portion 61A is a portion that restricts the rotation of the main body portion 11 during fastening by sandwiching the flat surface portion 11D of the main body portion 11. The main body side tool 61 includes a first tool 611 and a second tool 612.

The first tool 611 is an elongated plate-like member, and has a first main body restricting portion 611A on one plate surface. The first main body restricting portion 611A is composed of a pair of wall portions formed on the front side of the first tool 611, and is a portion that sandwiches the flat surface portion 11D of the main body portion 11.
The second tool 612 is an L-shaped wrench-like tool, and has a second main body restricting portion 612A at a front portion bent in an L shape from an elongated plate-like base portion. The second main body restricting portion 612A is composed of a pair of spanner-like wall portions, and is a portion that sandwiches the flat surface portion 11D of the main body portion 11. The second body restricting portion 612A constitutes a body restricting portion 61A together with the first body restricting portion 611A.

In addition, in this embodiment, although the main body side tool 61 is comprised by two members, the 1st tool 611 and the 2nd tool 612, you may comprise the main body side tool 61 integrally by one member.

The main body side tool 61 has a cable restricting portion 61B. The cable restricting portion 61B is a part that restricts the rotation of the optical cable 1 at the time of fastening by sandwiching the optical cable 1. The cable restricting portion 61B is composed of a pair of wall portions, and the optical cable 1 is sandwiched between the wall portions. A pair of wall part is comprised so that the optical cable 1 may be pinched | interposed from thickness direction. Thereby, when the operator presses the optical cable 1 with the thumb, the optical cable 1 is difficult to be removed from the cable restricting portion 61B.

In the present embodiment, since the main body side tool 61 is configured to be elongated along the longitudinal direction of the optical cable 1, the operator performs an operation of gripping the main body side tool 61 and an operation of pressing the optical cable 1 against the main body side tool 61. Is easy to do at the same time. If the main body side tool 61 is applied vertically to the optical cable 1 like the nut side tool 63, the structure is such that it is difficult for an operator to hold the optical cable 1 when fastening. Moreover, in this embodiment, since the base part of the 1st tool 611 and the 2nd tool 612 is comprised by the elongate plate-shaped member, an operator is the base part of the 1st tool 611 and the 2nd tool 612. And the work of pressing the optical cable 1 against the main body side tool 61 can be easily performed simultaneously.

The nut side tool 63 is a spanner-like tool. A pair of spanner-like walls (not shown) is formed at the end of the nut-side tool 63, and the flat portion 13D of the retaining nut 13 is sandwiched between them.

According to the attachment method of the clamp member 10 of the present embodiment, it is possible to fix the strength member 5 and the clamp member 10 without using an adhesive, which is convenient. In addition, since the force with which the strength member 5 is pressed against the force for fastening the retaining nut 13 to the main body 11 can be increased, according to the mounting method of the clamp member 10 of the present embodiment, the optical cable can be applied with a strong retaining force. 1 can be retained.

<Assembly Method of Optical Connector 100>
Next, a method for assembling the optical connector 100 will be described. 7A to 7D are explanatory views showing a state in which the connector unit 20 is attached.

The operator attaches the clamp member 10 to the end of the optical cable 1, then sets the clamp member 10 in the holder 71 (see FIGS. 7A and 7D), and uses the stripper (not shown) to remove the end of the optical fiber 3. While removing the coating, the end of the optical fiber 3 is cut using a cutter (not shown). At this time, when the holder 71 functions as a spacer, the end portion of the optical fiber 3 is pretreated so that the optical fiber 3 having a predetermined length extends from the clamp member 10 to the front side.

7A, the operator sets the holder 71 holding the clamp member 10 on the slider 72. As shown in FIG. 7A, the connector unit 20 to which the insertion member 27 is attached is held in advance on the slider 72.

7B, the operator moves the holder 71 along the slider 72 toward the connector unit 20 and inserts the optical fiber 3 into the connector unit 20 (specifically, the mechanical splice unit 23). The holder 71 is provided with a claw portion 71 </ b> A, and the operator moves the holder 71 until the claw portion 71 </ b> A of the holder 71 is caught by the front side flange portion 25 </ b> A of the connector unit 20. As a result, the operator can be urged to insert the optical fiber 3 having a predetermined length into the connector unit 20 (specifically, the mechanical splice portion 23). It can abut against the end face of the figure.

7C, the operator removes the insertion member 27 from the connector unit 20, removes the wedge 27A from the mechanical splice portion 23, and fixes the optical fiber 3 by the mechanical splice portion 23. Thereafter, as shown in FIG. 7D, the operator retracts the holder 71 to remove the connector unit 20 from the slider 72, and further takes out the clamp member 10 and the connector unit 20 from the holder 71.

FIG. 8 is an explanatory diagram of a state when the optical connector 100 is assembled. In the drawing, the internal housing 51 (the clamp member 10 and the connector unit housing 25) is housed in the external housing 52 (the front housing 33 and the rear housing 42).

The operator places the application mechanism 35 on the front side of the connector unit 20 and fastens the front housing 33 and the rear housing 42 by screw tightening, so that the external housing 52 (the front housing 33 and the rear housing 42) has an internal housing. 51 (clamp member 10 and connector unit housing 25) is accommodated. When the front housing 33 and the rear housing 42 are fitted, the flange 51A of the internal housing 51 (the rear flange 13C of the clamp member 10 and the front flange 25A of the connector unit housing 25) is the front housing 33 and the rear side. The inner housing 51 (the clamp member 10 and the connector unit housing 25) is fixed inside the outer housing 52 by being sandwiched between the housing 42 and the front and rear direction.

Also, the operator screws (fastens) the fastening member 46 of the rear protection unit 40 to the rear housing 42. FIG. 9 is a cross-sectional view of the vicinity of the rear protection unit 40.

As already described, the rear protection unit 40 includes the rear housing 42, the gasket 44, and the tightening member 46. A cable insertion hole is formed in the gasket 44, and the optical cable 1 is inserted through the cable insertion hole. The rear housing 42 and the fastening member 46 are made of a relatively hard material (for example, plastic or metal), whereas the gasket 44 is a relatively flexible material (for example, for protecting the optical cable 1). (Made of rubber). The fastening member 46 accommodates the rear portion of the rear housing 42 and the gasket 44.

The gasket 44 is formed with a receiving portion 44A. The receiving portion 44 </ b> A is a portion that receives a force from the tightening member 46. Here, the receiving portion 44A is formed as a tapered portion that is inclined so that the outer shape becomes larger toward the front side. Accordingly, the receiving portion 44A can receive a force in a direction toward the front side (a direction toward the rear housing 42) and a force in a direction toward the inside (a direction toward the optical cable 1) from the fastening member 46. . However, instead of forming the receiving portion 44A in a tapered shape, it may be configured to receive any one force (for example, a force in a direction toward the front side) by forming it in a stepped shape, for example. The receiving portion 44 </ b> A is deformed by receiving a force from the tightening member 46. The shape of the receiving portion 44A before deformation is indicated by a dotted line in the drawing.

A pressing portion 46 </ b> B is formed on the inner wall surface of the rear portion of the fastening member 46. The pressing part 46 </ b> B is a part that presses the receiving part 44 </ b> A of the gasket 44. Here, the pressing portion 46B has an inner wall surface that is inclined so that the inner diameter becomes smaller toward the rear side. A projecting portion that protrudes inward is formed on the inner surface of the tightening member 46, a pressing portion 46B is formed on the front side of the projecting portion, and a curved portion 46C that will be described later is formed on the rear side of the projecting portion. Is formed.

As shown in FIG. 9, a gasket 44 is disposed between the rear housing 42 and the pressing portion 46B. When the fastening member 46 is screwed to the rear housing 42, the receiving portion 44A of the gasket 44 is sandwiched between the rear housing 42 and the pressing portion 46B, and the receiving portion 44A of the gasket 44 receives force from the pressing portion 46B. It will be. In the present embodiment, the receiving portion 44 </ b> A of the gasket 44 receives a force from the pressing portion 46 </ b> B to the front side, so that the space between the rear housing 42 and the gasket 44 (in other words, between the rear housing 42 and the fastening member 46). The gap between the gaps is closed, and the inundation from this gap is suppressed. Further, when the receiving portion 44A of the gasket 44 receives a force from the pressing portion 46B to the inside (on the optical cable 1 side), the gap between the cable insertion hole of the gasket 44 and the optical cable 1 is closed, and from this gap Infiltration of water is suppressed.

By the way, the gasket 44 of the present embodiment is a member that is shorter in the front-rear direction than a member called a “boot”. Thus, since the gasket 44 is a member that is short in the front-rear direction, the gasket 44 is more easily deformed when subjected to a force than the boot, and therefore, the gap is easily narrowed when the tightening member 46 is screwed (fastened). There is an advantage.

Further, in the case of the boot, it is arranged so as to extend rearward from the rear end of the optical connector housing, and the rear end of the boot is located behind the rear end of the optical connector housing. Become. On the other hand, in this embodiment, the gasket 44 is accommodated inside the fastening member 46 (member constituting the rear end of the optical connector 100), and the rear end of the gasket 44 is located behind the fastening member 46. It is located in front of the end (the rear end of the optical connector 100). For this reason, the optical connector 100 of this embodiment also has the advantage that the dimension of the front-back direction can be shortened compared with the optical connector using a boot.

On the other hand, in the optical connector using the boot, the boot that extends to the rear side is flexibly deformed in accordance with the deformation of the optical cable, thereby suppressing a sharp curve of the optical cable. On the other hand, in the present embodiment, the gasket 44 is fixed inside the rear housing 42 and therefore cannot be deformed according to the deformation of the optical cable 1 like a boot. Therefore, in the present embodiment, a curved portion 46 </ b> C is provided on the inner wall surface of the fastening member 46 in order to suppress a sharp curve of the optical cable 1.

The curved portion 46C is a curved surface formed on the inner wall surface of the rear portion of the fastening member 46. The curved portion 46C is a rear portion of the pressing portion 46B. Further, the curved portion 46 </ b> C is a rear portion of the gasket 44. The curved portion 46C is provided to face the optical cable 1 on the rear side of the pressing portion 46B and the gasket 44. The curved portion 46C has a curved surface that is curved so that the inner diameter increases toward the rear side. A projecting portion that protrudes inward is formed on the inner surface of the tightening member 46, and a curved portion 46C is formed on the rear side of the projecting portion.

In the present embodiment, since the rear end of the fastening member 46 is located on the rear side relative to the rear end of the gasket 44, the inner wall surface (curved portion 46 </ b> C) of the fastening member 46 is located on the rear side of the gasket 44. The outer surface of the optical cable 1 is disposed opposite to the optical cable 1. For this reason, when the optical cable 1 is greatly curved, as shown by a dotted line in the figure, the optical cable 1 comes into contact with the bending portion 46C, and the bending of the optical cable 1 is restricted. Moreover, since the site | part (curved part 46C) which contacts the optical cable 1 is curving, damage to the optical cable 1 can be suppressed and the optical cable 1 can be protected. As described above, the bending portion 46 </ b> C has a protection function as a protection portion that limits the bending of the optical cable 1 and protects the optical cable 1. In other words, the bending portion 46 </ b> C functions as a guide portion that guides the bending of the optical cable 1.

As shown in the figure, R represents the radius of curvature of the curved portion 46C in the cross section passing through the central axis of the optical cable 1. The curvature radius R of the curved portion 46C is desirably equal to or larger than the allowable curvature radius R1 permitted for the optical cable 1 (R ≧ R1). Thereby, damage to the optical cable 1 can be suppressed. The allowable curvature radius R1 of the optical cable 1 corresponds to a value obtained by subtracting half of the thickness T of the optical cable 1 from the allowable curvature radius R2 of the optical fiber 3 (R1 = R2- (T / 2)). Therefore, in other words, the curvature radius R of the curved portion 46C is desirably equal to or greater than a value obtained by subtracting half of the thickness T of the optical cable 1 from the allowable curvature radius R2 of the optical fiber 3 (R ≧ R2− (T / 2). )). In the present embodiment, the allowable curvature radius R2 of the optical fiber 3 is set to 16 mm, and the thickness T of the optical cable 1 is 4 mm. Therefore, the allowable curvature radius R1 of the optical cable 1 is 14 mm. The curvature radius R of the curved portion 46C is set to 14 mm.

Incidentally, if the radius of curvature R of the curved portion 46C is larger than the allowable radius of curvature R2 of the optical fiber 3, it is larger than the allowable radius of curvature R1 of the optical cable 1, so that damage to the optical cable 1 can be suppressed more reliably. However, when the radius of curvature R of the curved portion 46C is larger than the allowable radius of curvature R2 of the optical fiber 3, the dimension of the curved portion 46C in the front-rear direction (in other words, the dimension of the tightening member 46 in the front-rear direction) increases. The optical connector 100 will be enlarged. For this reason, it is desirable that the curvature radius R of the curved portion 46 </ b> C is smaller than the allowable curvature radius R <b> 2 of the optical fiber 3. Thereby, size reduction of the optical connector 100 can be achieved. In the present embodiment, the curvature radius R of the curved portion 46C is 14 mm, which is set smaller than the allowable curvature radius R2 (= 16 mm) of the optical fiber 3.

=== Second Embodiment ===
10A and 10B are explanatory views of the clamp member 10 of the second embodiment.

Also in the second embodiment, the clamp member 10 includes a main body 11 and a retaining nut 13. The main body 11 of the second embodiment has a clamping member 14 that serves as an interposition member.

The sandwiching member 14 is a member for sandwiching the strength member 5. In the second embodiment, a pair of clamping members 14 are attached to the main body 11. Each clamping member 14 has a pair of clamping parts 14A and a connecting part 14B. The pair of sandwiching portions 14A are connected by a connecting portion 14B.

In addition, 14 A of clamping parts do not need to be connected by the connection part 14B. However, since the sandwiching member 14 has the connecting portion 14 </ b> B, the sandwiching member 14 can be attached to the main body portion 11 by engaging the connecting portion 14 </ b> B with the main body portion 11. Thereby, the operation | work which attaches the clamping member 14 to the main-body part 11 becomes easy.

Further, the connecting portion 14B may be configured to connect a pair of sandwiching portions 14A arranged vertically, instead of joining a pair of sandwiching portions 14A disposed on the left and right (in this case, the sandwiching member is The main body 11 is attached to the main body 11 so as to sandwich the main body 11 from the left and right directions). However, it is preferable that the upper and lower pair of sandwiching portions 14 </ b> A that sandwich the same strength member 5 is constituted by another clamping member 14 rather than the same clamping member 14. As in the present embodiment, the pair of sandwiching portions 14A arranged on the upper and lower sides are configured by separate members, so that the sandwiching portion 14A can be easily displaced toward the strength member 5 and the strength member 5 can be easily gripped.

The clamping member 14 has a tapered surface 14C and a contact surface 14D. In other words, the clamping portion 14A has a tapered surface 14C and a contact surface 14D.

The tapered surface 14C is the outer surface of the clamping member 14 (the clamping portion 14A), and is a surface that is inclined so that the outer shape becomes larger toward the rear side. When the retaining nut 13 is fitted to the main body 11, the tapered surface 14C receives a force from the inner surface of the retaining nut 13 (not necessarily the female threaded portion 13A), and the sandwiching member 14 is deformed, and the sandwiching portion 14A is displaced toward the strength member 5.

The contact surface 14 </ b> D is a surface in contact with the tensile body 5. As shown in FIG. 10B, when the clamping member 14 is attached to the main body 11, the side surface of the strength member groove 11B is configured by the contact surface 14D. Also in the second embodiment, when the optical fiber 1 is attached to the main body 11 at the end of the optical cable 1, the optical fiber 3 is inserted into the fiber insertion hole 11A, and a pair of side surfaces (contact surface 14D) of the strength member groove 11B. The tensile body 5 is disposed between the two.

In the second embodiment, when the female screw portion 13A of the retaining nut 13 is fitted to the male screw portion 11C of the main body 11, the tapered surface 14C may not be the inner surface of the retaining nut 13 (the female screw portion 13A). ), The clamping member 14 is deformed, and the contact surface 14D presses the strength member 5 from above and below. By placing the clamping member 14 (interposition member) between the strength member 5 and the retaining nut 13, the tension member 5 is compressed as compared with the case where the thread of the retaining nut 13 directly contacts the strength member 5. Since the area to be processed can be widened, a strong retention force can be realized. Moreover, since it can suppress that a strong force is locally applied to the tension body 5 compared with the case where the thread of the tensioning nut 13 is in direct contact with the tension body 5, damage to the tension body 5 can be suppressed.

In addition, the clamp member 10 of 2nd Embodiment is also fixed inside the external housing 52 of the optical connector 100 similarly to the clamp member 10 of 1st Embodiment. The configuration and assembly method of the optical connector 100 of the second embodiment are the same as those of the first embodiment.

=== Others ===
The above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be modified and improved without departing from the gist thereof, and it goes without saying that the present invention includes equivalents thereof.

1 optical cable, 2 tube cable,
3 optical fiber, 5 strength member, 7 outer jacket,
10 Clamp member, 11 Body part,
11A Fiber insertion hole, 11B Strengthening groove,
11C male thread part, 11D plane part, 11E protrusion part,
12 metal sleeve (intervening member), 12A flange,
12B opening, 12C slit,
13 Tightening nut, 13A female thread,
13B engagement part, 13C rear side collar part, 13D plane part,
14 clamping member (interposition member), 14A clamping part,
14B connecting part, 14C taper surface, 14D contact surface,
20 connector units, 21 ferrules,
23 mechanical splice, 25 connector unit housing,
25A front side collar, 25B protrusion,
27 Insertion member, 27A Wedge,
30 coupling unit, 31 rotating member,
33 front housing, 33A male thread,
35 application mechanism, 35A movable housing, 35B spring,
40 rear protection unit, 42 rear housing (outer housing),
42A female thread part, 42B male thread part,
44 gasket, 44A receiving part,
46 Tightening member, 46A female thread part,
46B pressing part, 46C bending part,
51 inner housing, 51A buttocks,
52 outer housing,
60 fastening tool, 61 body side tool,
61A body restriction part, 61B cable restriction part,
611 1st tool, 611A 1st main part regulation part,
612 2nd tool, 612A 2nd body regulation part,
63 Nut side tool,
71 holder, 71A claw part,
72 Slider, 100 Optical connector

Claims (15)

A clamp member that is fixed to an end portion of an optical cable having an optical fiber and a tensile body, and is fixed and accommodated in an external housing of the optical connector,
A fiber insertion hole through which the optical fiber is inserted, a tensile strength body groove in which the tensile strength body is disposed, and a main body portion having a male screw portion;
A clamp having a female screw portion that fits into the male screw portion of the main body portion, and a retaining nut that fixes the strength member to the main body portion by fitting into the main body portion. Element. The clamp member according to claim 1,
The main body has an interposed member,
By fitting the retaining nut to the main body, the interposition member deformed by receiving a force from the retaining nut presses the tensile body, and the tensile body is fixed to the main body. A clamp member. The clamp member according to claim 2,
The clamp member according to claim 1, wherein the interposition member is a cylindrical metal sleeve disposed in the groove for the strength member. The clamp member according to claim 3,
The metal sleeve has a slit along the longitudinal direction. The clamp member according to claim 4,
The clamp member, wherein the metal sleeve is arranged in the strength member groove so that the slit faces a bottom surface side of the strength member groove. The clamp member according to any one of claims 3 to 5,
The clamp member according to claim 1, wherein the metal sleeve has an inclined opening. The clamp member according to claim 2,
The interposition member is a clamping member having a tapered surface and a contact surface,
When the interposition member is attached to the main body, the contact surface constitutes a side surface of the strength member groove,
When the retaining nut is fitted to the main body, the interposed member is deformed by receiving a force from the retaining nut on the tapered surface, and the contact surface compresses the strength member. Clamp member. An optical connector attached to an end of an optical cable having an optical fiber and a tensile body,
An outer housing;
A clamp member that is fixed to the tensile body of the optical cable and is housed by being fixed to the external housing;
The clamp member is
A fiber insertion hole through which the optical fiber is inserted, a tensile strength body groove in which the tensile strength body is disposed, and a main body portion having a male screw portion;
A light having a female screw portion that fits into the male screw portion of the main body portion, and a retaining nut that fixes the strength member to the main body portion by fitting into the main body portion. connector. The optical connector according to claim 8,
A fastening member fastened to the outer housing;
A gasket that narrows the gap by being pressed from the tightening member;
With
An optical connector characterized in that an inner wall surface of the tightening member is provided with a pressing portion that presses the gasket and a curved portion that faces the optical cable on the rear side of the pressing portion and the gasket. . The optical connector according to claim 9, wherein
The optical connector according to claim 1, wherein a curvature radius of the curved portion is equal to or greater than an allowable curvature radius of the optical cable. The optical connector according to claim 10,
The optical connector according to claim 1, wherein a curvature radius of the curved portion is equal to or less than an allowable curvature radius of the optical fiber of the optical cable. The optical connector according to any one of claims 9 to 11,
When the fastening member is fastened to the outer housing,
An optical connector, wherein the gap between the outer housing and the gasket is narrowed by pressing the gasket in a direction from the tightening member toward the outer housing. The optical connector according to any one of claims 9 to 11,
When the fastening member is fastened to the outer housing,
The optical connector is characterized in that a gap between the gasket and the optical cable is narrowed by pressing the gasket in a direction from the tightening member toward the external housing. The optical connector according to any one of claims 9 to 11,
The gasket has a receiving portion formed in a tapered shape,
When the fastening member is fastened to the outer housing,
The receiving portion is pressed in a direction from the fastening member toward the outer housing, thereby narrowing a gap between the outer housing and the gasket,
The optical connector according to claim 1, wherein a gap between the gasket and the optical cable is narrowed by pressing the receiving portion in a direction from the fastening member toward the optical cable. A method of manufacturing an optical connector attached to an end of an optical cable having an optical fiber and a tensile body,
Inserting the optical fiber into the fiber insertion hole of the main body portion constituting the clamp member, and disposing the tensile body in the tensile body groove of the main body portion;
Fixing the tensile body to the clamp member by fitting a retaining nut to the male thread portion of the main body; and
A method for manufacturing an optical connector, comprising: housing and fixing the clamp member in an external housing.

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