JP2012233949A - Optical connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical connector suppressed in rotation of an optical cord.SOLUTION: The optical connector is a female side optical connector 12 including a housing in which a ferrule 13B externally fitted at a distal end of an optical fiber 16B exposed from a terminal of an optical cord 18B. In the female side optical connector 12, a tensile strength material 34 is interposed between the optical fiber 16B and a sheath 17B, the tensile strength material 34 exposed from the sheath 17B is held by an inner ring 36 and an outer ring 37 by caulking the outer ring 37, a first caulking protrusion section 40 projecting outward in a radial direction of the outer ring 37 is formed in the outer ring 37, an outer ring housing section 42 in which the outer ring 37 is housed is formed in a female side housing 24, and a detent section 49 abutting on the first caulking protrusion section 40 from a peripheral direction of the outer ring 37 when force of the peripheral direction of the outer ring 37 is applied to the outer ring 37 is formed at an inner wall of the outer ring housing section 42.

Description

  The present invention relates to an optical connector.

  Conventionally, the thing of patent document 1 is known as an optical connector. The optical connector includes a housing that houses a ferrule fixed to the tip of an optical fiber exposed from the end of an optical cord formed by surrounding the outer periphery of the optical fiber with a sheath. A tensile strength material is interposed between the optical fiber and the sheath. This tensile strength material prevents the optical fiber from being cut when an excessive tension is applied to the optical cord.

  The tensile strength material is pulled out from the distal end of the sheath of the sheath and is caulked by a caulking ring while being sandwiched between the end portion of the stop ring and the caulking ring. A spring is interposed between the stop ring and the ferrule.

JP 2008-191410 A

  When a force in the circumferential direction of the optical cord is applied to the optical cord sheath, the optical cord sheath rotates about the axis of the optical cord. Then, the tensile strength material and the optical fiber arranged inside the sheath also rotate around the axis of the optical cord. Since the tensile strength material is caulked to the stop ring, the tensile strength material and the stop ring rotate following each other. On the other hand, since the optical fiber is fixed to the ferrule, the optical fiber and the ferrule rotate following.

  However, only a spring is interposed between the ferrule and the stop ring, and the ferrule and the stop ring are not fixed. For this reason, there is a concern that the ferrule and the stop ring rotate independently of each other. Then, there is a concern that a torsional force acts between the tensile strength material and the optical fiber because the stop ring crimped to the tensile strength material and the ferrule fixed to the optical fiber rotate independently of each other. There is a concern that the optical fiber is damaged by this twisting force.

  The present invention has been completed based on the above situation, and an object thereof is to provide an optical connector in which the rotation of the optical cord is suppressed.

  The present invention is an optical connector comprising a housing in which a ferrule externally fitted to the tip of the optical fiber exposed from the end of the optical cord formed by covering the outer periphery of the optical fiber with a sheath is housed. A tensile strength material is interposed between the fiber and the sheath, and the tensile strength material exposed from the sheath is caulked on the outer ring while being sandwiched between the inner ring and the outer ring. The outer ring is sandwiched between the inner ring and the outer ring, and a caulking protrusion that protrudes outward in the radial direction of the outer ring is formed on the outer ring, and the outer ring is accommodated in the housing. An outer ring accommodating portion is formed, and when a circumferential force of the outer ring is applied to the inner wall of the outer ring accommodating portion with respect to the outer ring, Rotation stopper abuts the circumferential direction of the Kigai ring is formed.

  When a circumferential force of the optical cord is applied to the optical cord, the optical cord tends to rotate about the axis of the optical cord. Then, since the tensile strength material is interposed between the sheath and the optical fiber in the optical cord, a force directed to the circumferential direction of the optical cord is also applied to the tensile strength material via the sheath. Since this tensile strength material is sandwiched between the inner ring and the outer ring, a force in the circumferential direction of the outer ring is also applied to the outer ring via the tensile strength material. As a result, the outer ring tends to rotate about its axis. According to the present invention, the anti-rotation portion is formed on the inner wall of the outer ring housing portion that houses the outer ring. This detent portion abuts against the caulking projection that attempts to rotate about the axis of the outer ring from the circumferential direction of the outer ring. This suppresses the outer ring from rotating about its axis. As a result, rotation of the outer ring, the tensile strength material, and the optical cord can be suppressed.

As embodiments of the present invention, the following embodiments are preferable.
It is preferable that the rotation preventing portion is an inner wall surface of a recess formed by being recessed in the inner wall of the outer ring housing portion.

  According to the above aspect, the caulking protrusion comes into contact with the inner wall surface of the recess formed on the inner wall of the outer ring housing portion from the circumferential direction of the outer ring. Thus, rotation of the optical cord can be suppressed by a simple configuration in which a recess is formed in the inner wall of the outer ring housing portion.

  A plurality of the caulking protrusions are formed on the outer ring at equal angular intervals in the circumferential direction of the outer ring, and the inner wall of the outer ring housing part has an angular interval between the plurality of caulking protrusions. It is preferable that a plurality of the detent portions are formed at the same angular interval.

  For example, in the case where one caulking protrusion is formed on the outer ring and one rotation stopper is formed on the outer ring accommodating portion, the worst case is to accommodate the outer ring in the outer ring accommodating portion. If this is the case, the outer ring must be rotated approximately 360 °. For this reason, the process of accommodating an outer ring in an outer ring accommodating part will become complicated. In view of the above points, in this aspect, the plurality of caulking projections are formed at equal angular intervals in the circumferential direction of the outer ring, and the angle of the plurality of caulking projections is formed on the inner wall of the outer ring housing portion. A plurality of detent portions are formed at the same angular interval as the interval. Thereby, in the process of accommodating the outer ring in the ring accommodating portion, if the operator rotates the outer ring by the angle of the adjacent caulking protrusion, the caulking protrusion and the rotation stopper can be associated with each other. . For example, four caulking protrusions are formed on the outer periphery of the outer ring with an interval of 90 °, and the outer ring housing portion has four rotation stoppers with an interval of 90 ° corresponding to the caulking protrusion. In the case where it is formed, even in the worst case, the operator can cause the caulking protrusion and the rotation preventing portion to correspond to each other only by rotating the outer ring by approximately 90 °. Thereby, the working efficiency of the process of accommodating an outer ring in an outer ring accommodating part can be improved.

  The housing includes a lower housing and an upper housing assembled to the lower housing, and the outer ring housing portion is provided between the lower housing and the upper housing by assembling the lower housing and the upper housing. Is preferably formed.

  According to said aspect, after mounting an outer ring in the position corresponding to an outer ring accommodating part among lower housings, an outer ring is accommodated in an outer ring accommodating part by assembling | attaching an upper housing to a lower housing. Can do. Thereby, for example, compared with a case where the outer ring is inserted and accommodated in an outer ring accommodating portion formed in a hole shape in the housing, an operation process for accommodating the outer ring in the housing can be easily performed.

  It is preferable that the outer peripheral surface of the outer ring is sandwiched between the lower housing and the upper housing in a state where the lower housing and the upper housing are assembled.

  According to said aspect, it can suppress that an outer ring rattles. Thereby, it can suppress reliably that an optical cord rotates.

  It is preferable that the caulking protrusion is sandwiched between the rotation preventing portions formed on the inner wall surface of the recess from both sides in the circumferential direction of the outer ring while being accommodated in the recess.

  According to said aspect, it can suppress reliably that an outer ring and an optical cord rotate by a crimping protrusion being pinched | interposed from the both sides of the circumferential direction of an outer ring by a rotation prevention part.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the optical cord distribute | arranged to an optical connector rotates.

Sectional drawing which shows the optical connector which concerns on Embodiment 1 of this invention Side view showing the lower housing Plan view showing the lower housing Rear view showing the lower housing Side view showing the upper housing Bottom view showing the upper housing Rear view showing the upper housing An exploded perspective view showing an inner ring, an outer ring, and an optical cord The perspective view which shows the state in which the inner ring and the outer ring were attached to the optical cord Rear view showing lower side small-diameter housing groove, upper side small-diameter housing groove, and small-diameter portion The rear view which shows the engagement state of a 1st crimping protrusion and a rotation prevention part The optical connector which concerns on Embodiment 2 of this invention WHEREIN: The rear view which shows the engagement state of a 1st crimping protrusion and a rotation prevention part The optical connector which concerns on Embodiment 3 of this invention WHEREIN: The rear view which shows the engagement state of a 1st crimping protrusion and a rotation prevention part The optical connector which concerns on Embodiment 3 of this invention WHEREIN: The rear view which shows the engagement state of a 1st crimping protrusion and a rotation prevention part

<Embodiment 1>
A first embodiment in which the present invention is applied to at least one of a pair of optical connectors fitted to each other will be described with reference to FIGS. The optical connector includes a male optical connector 10 and a female optical connector 12 (an example of an optical connector described in claims) having a hood portion 11 into which the male optical connector 10 is inserted. In the following description, the front in the fitting direction of each optical connector is defined as the front, and the rear in the fitting direction is defined as the rear. Further, regarding the vertical direction, the upper side in FIG. 1 is the upper side, and the lower side is the lower side.

(Male optical connector 10)
The male optical connector 10 located on the right side in FIG. 1 has a male housing 15 made of synthetic resin in which a cavity 14 for accommodating a ferrule 13A is formed. The ferrule 13A is fitted on the tip of the optical fiber 16A exposed from the end of the optical cord 18A formed by covering the outer periphery of the optical fiber 16A with a sheath 17A. The optical fiber 16A and the ferrule 13A are fixed by a known method such as an adhesive. The ferrule 13A has an elongated shape in the front-rear direction. A flange 19 projecting outward is formed on the outer surface of the ferrule 13A. A spring 21 is interposed between the flange 19 and a spring receiving portion 20 formed inwardly projecting in the cavity 14. The ferrule 13A is urged forward (leftward in FIG. 1) by the spring 21.

  An insertion hole 22 through which the front end of the ferrule 13A is inserted is formed in the front wall of the cavity 14. The ferrule 13 </ b> A protruding from the insertion hole 22 is surrounded by a protective cylinder portion 23 formed in the male housing 15, and is protected by the protective cylinder portion 23.

(Female optical connector 12)
The female optical connector 12 located on the left side in FIG. 1 has a female housing 24 made of synthetic resin in which the ferrule 13B is accommodated. A fitting tube portion 25 is formed in the hood portion 11 of the female housing 24 so as to protrude forward (rightward in FIG. 1). The fitting cylinder part 25 is inserted into the protective cylinder part 23 of the male housing 15. A split sleeve 26 is inserted into the protective cylinder portion 23.

  The split sleeve 26 is made of a metal and can be elastically deformed, and has a substantially cylindrical shape. A slit 35 (not shown) is formed on the side edge of the split sleeve 26 in the front-rear direction. The slit 35 allows the split sleeve 26 to be elastically deformed in the radial direction.

  At the rear end of the split sleeve 26, a pair of engagement protrusions 27 that protrude outward in the radial direction of the split sleeve 26 are formed. The engagement protrusion 27 is engaged with the rear wall of the hood portion 11 from the rear (left side in FIG. 1), so that the split sleeve 26 is restrained from moving forward (right side in FIG. 1). It has become.

  As shown in FIG. 3, the female-side housing 24 includes a lower housing 28 that includes the hood portion 11 and opens upward, and an upper housing 29 that is assembled to the lower housing 28 from above. The end portion of the optical cord 18B and the ferrule 13B are accommodated in a space surrounded by the lower housing 28 and the upper housing 29. A lock projection 31 is formed on the side wall of the lower housing 28 so as to project outward. As shown in FIG. 2, two lock protrusions 31 are formed side by side in the front-rear direction on the side wall of the lower housing 28.

  As shown in FIG. 7, the upper housing 29 has an upper wall and a pair of side walls depending downward from left and right side edges of the upper wall. As shown in FIG. 5, a lock receiving portion 32 that is elastically engaged with the lock protrusion 31 is formed on the side wall of the upper housing 29 at a position corresponding to the lock protrusion 31. The lower housing 28 and the upper housing 29 are assembled together by elastically engaging the lock protrusion 31 and the lock receiving portion 32.

(Optical fiber 16)
As shown in FIG. 1, a ferrule 13B is fitted on the tip of the optical fiber 16B exposed from the end of an optical cord 18B formed by covering the outer periphery of the optical fiber 16B with a sheath 17B. The optical fiber 16B is fixed by a known method such as an adhesive while being inserted into a through hole (not shown) formed in the ferrule 13B. The optical fiber 16B is a member that transmits an optical signal, and various known optical fibers are applied.

  The tip of the ferrule 13B is inserted into the split sleeve 26 from the rear end side (left side in FIG. 1) of the split sleeve 26. When the female optical connector 12 and the male optical connector 10 are fitted, the ferrule 13A of the male optical connector 10 is inserted into the split sleeve 26, and the distal end surface of the ferrule 13B of the female optical connector 12 and the male side The front end surface of the ferrule 13 </ b> A of the optical connector 10 is abutted in the split sleeve 26. Thereby, the optical fibers 16A and 16B fixed to both ferrules 13A and 13B are optically connected.

  As shown in FIG. 8, the sheath 17B of the optical cord 18B has a substantially tube shape. A through hole 33 extending in the axial direction is formed in the sheath 17B. The cross-sectional shape of the sheath 17B is not particularly limited, but is substantially circular in this embodiment. The sheath 17B is compressible and deformable in the radial direction when a compressive force is applied from the outer periphery. The sheath 17B is made of various synthetic resin materials such as polyvinyl chloride, polyethylene, and non-halogen flame retardant polyethylene.

  A tensile strength material 34 is accommodated in the through-hole 33, and the optical fiber 16 </ b> B is accommodated in a state surrounded by the tensile strength material 34. The tensile strength material 34 is a string-like member. The tensile strength material 34 is a member for preventing the optical fiber 16B from being broken when an excessive tension is applied to the optical cord 18B, and is formed of, for example, an aramid fiber.

  A slit 35 extending in the axial direction from the end face is formed at the end of the sheath 17B. The tensile strength material 34 is inserted into the slit 35 and pulled out to the outside of the sheath 17B.

(Inner ring 36 and outer ring 37)
As shown in FIGS. 8 and 9, the tensile material 34 drawn out of the sheath 17 </ b> B is sandwiched between a metal inner ring 36 and a metal outer ring 37, and the outer ring 37. Is clamped by being reduced in diameter and clamped by the inner ring 36 and the outer ring 37.

  The inner ring 36 is formed, for example, by cutting a metal material. The inner ring 36 is substantially annular or cylindrical. The inner diameter of the inner ring 36 is set to be the same as or slightly larger than the outer diameter of the sheath 17B of the optical cord 18B. Thereby, the inner ring 36 can be fitted onto the sheath 17B of the optical cord 18B. Concavities and convexities for improving the bonding strength with the tensile strength material 34 may be formed on the outer peripheral surface of the inner ring 36.

  The outer ring 37 is formed by cutting a metal material, for example. The outer ring 37 is substantially annular or cylindrical. The outer ring 37 includes a small-diameter portion 38 having a relatively small inner diameter and a large-diameter portion 39 having an inner diameter larger than the small-diameter portion 38 in series in the axial direction of the outer ring 37.

  The inner diameter of the small diameter portion 38 is set to be the same as or slightly larger than the outer diameter of the sheath 17B of the optical cord 18B. Thereby, the small diameter portion 38 of the outer ring 37 can be fitted onto the sheath 17B of the optical cord 18B.

  The inner diameter of the large diameter portion is set to be slightly larger than the outer diameter of the inner ring 36. As a result, the large-diameter portion 39 of the outer ring 37 can be externally fitted to the inner ring 36 with the tensile material 34 interposed on the outer side of the inner ring 36.

  The inner ring 36 can be made of a material that is more difficult to deform than the outer ring 37. For example, the inner ring 36 may be formed of a material that is harder than the outer ring 37. For example, the inner ring 36 may be formed of stainless steel or a copper alloy such as brass, and the outer ring 37 may be formed of aluminum or an aluminum alloy.

  Subsequently, the attachment structure of the inner ring 36 and the outer ring 37 and the optical cord 18B will be described. The tensile strength material 34 of the optical cord 18B is passed through a slit 35 formed in the sheath 17B and pulled out of the sheath 17B. The inner ring 36 is externally fitted to the front end portion of the sheath 17B from the front. The tensile strength material 34 drawn out of the sheath 17B is disposed on the outer peripheral side of the inner ring 36.

  The small-diameter portion 38 of the outer ring 37 is externally fitted to the sheath 17B of the optical cord 18B at a position behind the inner ring 36, and the large-diameter portion 39 of the outer ring 37 overlaps the outside of the inner ring 36. Is arranged. The small-diameter portion 38 is fixed in a state of being bitten into the outer surface of the sheath 17B by being plastically deformed and caulked in the diameter-reducing direction. By caulking the small-diameter portion 38, the small-diameter portion 38 has a pair of first caulking projections 40 (an example of the caulking projection described in the claims) that protrudes in the approximately diameter direction of the small-diameter portion 38. Is formed.

  On the other hand, the large-diameter portion 39 is crimped by being plastically deformed in the diameter-reducing direction with the tensile material 34 sandwiched between the inner ring 36 and the inner ring 36. By caulking the large-diameter portion 39, the large-diameter portion 39 is formed with a pair of second caulking protrusions 41 that project in the diameter direction of the large-diameter portion 39. In the present embodiment, the direction in which the first caulking protrusion 40 protrudes and the direction in which the second caulking protrusion 41 protrudes substantially match, but the direction in which the first caulking protrusion 40 protrudes, The direction in which the two caulking protrusion 41 protrudes may be different.

(Outer ring housing part 42)
As shown in FIG. 3, a lower side outer ring receiving groove 43 for receiving the outer ring 37 is formed in the receiving portion of the lower housing 28 so as to extend in the front-rear direction. In the present embodiment, two lower side outer ring receiving grooves 43 are formed side by side. The lower-side outer ring receiving groove 43 is formed in a lower-side smaller-diameter receiving groove 44 in which the smaller-diameter portion 38 of the outer ring 37 is received, and in front of the lower-side smaller-diameter receiving groove 44 (rightward in FIG. 3). A lower-side large-diameter receiving groove 45 formed.

  On the other hand, as shown in FIG. 6, two upper side outer ring receiving grooves 46 extend in the front-rear direction on the upper wall of the upper housing 29 at positions corresponding to the lower side outer ring receiving grooves 43 of the lower housing 28. Is formed. The upper-side outer ring receiving groove 46 is formed in an upper-side small-diameter receiving groove 47 in which the small-diameter portion 38 of the outer ring 37 is accommodated, and in front of the upper-side small-diameter receiving groove 47 (rightward in FIG. 6). And an upper side large-diameter receiving groove 48 formed.

  In a state where the lower housing 28 and the upper housing 29 are assembled, the space surrounded by the lower-side outer ring receiving groove 43 and the upper-side outer ring receiving groove 46 is an outer ring receiving portion 42, and is It has a substantially cylindrical shape extending in the direction. After the outer ring 37 is placed in the lower-side outer ring receiving groove 43 of the lower housing 28, the upper housing 29 is assembled to the lower housing 28 to be received in the outer ring receiving portion 42. Yes.

(Non-rotating part 49)
As shown in FIG. 4, the lower side small-diameter receiving groove 44 has a substantially semicircular cross section. The inner diameter dimension of the lower-side small-diameter receiving groove 44 is set to be substantially the same as or slightly larger than the outer shape of the small-diameter part 38. On the inner wall of the lower-side small-diameter receiving groove 44, a pair of recesses 50 that are recessed outward in the radial direction of the lower-side small-diameter receiving groove 44 at a position near the upper end of the lower-side small-diameter receiving groove 44. Is formed. In the recess 50, the dimension of the recess 50 recessed from the inner wall surface of the lower-side small-diameter receiving groove 44 is set to be the same as or slightly larger than the dimension of the first caulking protrusion 40 protruding from the outer surface of the small-diameter part 38. . As shown in FIG. 3, the recess 50 is formed over the entire region in the front-rear direction of the lower-side small-diameter receiving groove 44.

  As shown in FIGS. 10 and 11, the pair of first caulking protrusions 40 are positioned above the respective recesses 50 in a state where the small diameter portion 38 is accommodated inside the lower side small diameter portion accommodating groove 44. Is arranged. The inner wall surface of the recess 50 may abut against the first caulking protrusion 40 from below, or may be spaced apart. When the circumferential force of the outer ring 37 is applied to the outer ring 37, the inner wall surface of the recess 50 is in a direction opposite to this force and the first caulking projection from the circumferential direction of the outer ring 37. The rotation stopper 49 is in contact with 40. As shown in FIG. 11, the outer surface of the small-diameter portion 38 of the outer ring 37 is sandwiched and held between the inner wall of the upper-side small-diameter receiving groove 47 and the inner wall of the lower-side small-diameter receiving groove 44. It has come to be. 10 and 11, the optical cord 18B, the inner ring 36, and the like are omitted in order to explain the engagement state between the first caulking protrusion 40 and the rotation stopper 49.

(Operation and effect of this embodiment)
Then, the effect | action and effect of this embodiment are demonstrated. When a circumferential force of the optical cord 18B is applied to the optical cord 18B, the optical cord 18B tends to rotate about the axis of the optical cord 18B. In the optical cord 18B, since the tensile strength material 34 is interposed between the sheath 17B and the optical fiber 16B, the tensile strength material 34 also tries to rotate. Since the tensile material 34 is sandwiched between the inner ring 36 and the outer ring 37, a force in the circumferential direction of the outer ring 37 is also applied to the outer ring 37 via the tensile material 34. Thus, the outer ring 37 tries to rotate around its axis.

  In the present embodiment, a concave portion 50 is formed in the inner wall of the outer ring accommodating portion 42 in which the outer ring 37 is accommodated, and the inner wall surface of the concave portion 50 serves as a rotation preventing portion 49. Specifically, the inner wall surface of the recess 50 formed by being recessed near the upper end of the lower-side small-diameter receiving groove 44 constituting the outer ring receiving portion 42 is used as the detent portion 49. The rotation preventing portion 49 is in the circumferential direction of the outer ring 37 and opposite to the force applied to the outer ring 37 with respect to the first caulking protrusion 40 that attempts to rotate about the axis of the outer ring 37. Contact from the direction. In the present embodiment, the rotation preventing portion 49 comes into contact with the first caulking projection 40 from below. Thereby, it is suppressed that the outer ring 37 rotates centering | focusing on the axis line. As a result, rotation of the outer ring 37, the tensile strength material 34, and the optical cord 18B can be suppressed. As a result, since it is possible to suppress the twisting force from acting on the optical fiber 16B, it is possible to suppress the optical fiber 16B from being damaged.

  Further, as described above, in the present embodiment, the rotation preventing portion 49 is the inner wall surface of the recess 50 formed by being recessed in the inner wall of the ring housing portion. Thus, according to this embodiment, rotation of the optical cord 18B can be suppressed by a simple configuration in which the recess 50 is formed in the inner wall of the ring housing portion.

  In the present embodiment, the first caulking protrusion 40 formed in the small diameter portion 38 and the rotation preventing portion 49 are in contact with each other. Since the small-diameter portion 38 is caulked to the sheath 17B of the optical cord 18B, the rotation of the optical cord 18B can be reliably suppressed by preventing the small-diameter portion 38 from rotating.

  The housing includes a lower housing 28 and an upper housing 29 assembled to the lower housing 28, and the outer housing 28 and the upper housing 29 are assembled to form an outer ring between the lower housing 28 and the upper housing 29. A housing portion 42 is formed. Thus, as shown in FIG. 10, after the outer ring 37 is placed at a position corresponding to the outer ring housing portion 42 in the lower housing 28, the upper housing 29 is moved from above (the direction indicated by the arrow in FIG. 10). ) The outer ring 37 can be accommodated in the outer ring accommodating portion 42 by being assembled to the lower housing 28. Thereby, for example, compared with the case where the outer ring 37 is inserted and accommodated in the outer ring accommodating portion 42 formed in a hole shape in the housing, an operation process for accommodating the outer ring 37 in the housing is easily performed. Can do.

  Further, according to the present embodiment, the outer surface of the small-diameter portion 38 of the outer ring 37 is sandwiched between the inner wall of the upper-side small-diameter receiving groove 47 and the inner wall of the lower-side small-diameter receiving groove 44. ing. Thereby, it can suppress that the outer ring 37 rattles. As a result, it is possible to reliably suppress the rotation of the optical cord 18B.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIGS. In the present embodiment, four first caulking projections 60 are formed in the small diameter portion 38 at an equal angular interval with an angle of 90 ° to each other.

  A pair of recesses 61 </ b> A is recessed and formed at a position near the upper end of the lower side small diameter receiving groove 44. A recess 61 </ b> B is further formed at the bottom of the lower-side small-diameter receiving groove 44 by sinking downward. Furthermore, a concave portion 61 </ b> C that is recessed upward is formed in the upper portion of the upper side small diameter portion accommodating groove 47. Thereby, in the outer ring accommodating part 42 formed between the lower side small diameter part accommodating groove 44 and the upper side small diameter part accommodating groove 47, the four concave parts 61A, 61B, 61C is formed. The inner wall surfaces of these recesses 61 </ b> A, 61 </ b> B, 61 </ b> C serve as a rotation preventing portion 62 that contacts the first caulking protrusion 40 and the outer ring 37 from the circumferential direction.

  The first caulking protrusion 60 is sandwiched between the rotation preventing portions 62 formed on the inner wall surfaces of the recesses 61B and 61C from both circumferential sides of the outer ring 37 in a state of being accommodated in the recesses 61B and 61C. It has become.

  Since the configuration other than the above is substantially the same as that of the first embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  For example, in the case where one caulking protrusion is formed on the outer ring 37 and one rotation stopper is formed on the outer ring accommodating portion 42, the outer ring 37 is accommodated in the outer ring accommodating portion 42. In the worst case, the outer ring 37 must be rotated approximately 360 °. For this reason, the process of accommodating the outer ring 37 in the outer ring accommodating portion 42 becomes complicated.

  In view of the above points, in the present embodiment, the four first caulking protrusions 60 are formed at equal angular intervals in the circumferential direction of the outer ring 37. Further, four detent portions 62 are formed on the inner wall of the outer ring accommodating portion 42 with the same angular interval as that of the four first caulking projections 60. Thereby, in the process of accommodating the outer ring 37 in the ring accommodating portion, if the operator rotates the outer ring 37 by the angle of the adjacent first caulking projection 60, the first caulking projection 60 and the detent are prevented. The part 62 can be made to correspond. More specifically, as in the present embodiment, four first caulking projections 60 are formed on the outer periphery of the outer ring 37 with an interval of 90 °, and the first caulking projections are formed in the outer ring accommodating portion 42. When the four anti-rotation portions 62 are formed at intervals of 90 ° corresponding to the portion 60, the operator can rotate the outer ring 37 by approximately 90 ° even in the worst case. The one caulking protrusion 60 and the rotation stopper 62 can be made to correspond to each other. Thereby, the work efficiency of the process of accommodating the outer ring 37 in the outer ring accommodating part 42 can be improved.

  In addition, according to the present embodiment, each of the first caulking protrusions 60 is sandwiched from both sides in the circumferential direction of the outer ring 37 by the rotation stoppers 62, so that the outer ring 37 and the optical cord 18B are reliably rotated. Can be suppressed.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIGS. In the present embodiment, two first caulking projections 70 are formed in the small diameter portion 38 at an equal angular interval with an angle of 180 °.

  Since the configuration other than the above is substantially the same as that of the second embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 13 and 14, according to this embodiment, the operator can cause the first caulking protrusion 70 and the rotation stopper 49 to correspond to each other only by rotating the outer ring 37 by approximately 90 °. it can. Thereby, the work efficiency of the process of accommodating the outer ring 37 in the outer ring accommodating part 42 can be improved.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the present embodiment, the embodiment in which the present invention is applied to the female optical connector 12 has been described, but the present invention can also be applied to the male optical connector 10.
(2) Although the optical cord 18B according to the present embodiment has a configuration including one optical fiber 16B, the configuration is not limited thereto, and a configuration in which a plurality of optical fibers 16B are included in one optical cord 18B may be employed.
(3) In the present embodiment, the rotation stopper 49 is the inner wall surface of the recess 50 formed in the inner wall of the outer ring housing portion 42, but is not limited to this, and the rotation stopper 49 is not limited to the outer ring housing portion 42. It is good also as a convex part which protrudes inward from the inner wall.
(4) In the present embodiment, a plurality of caulking protrusions are formed on one outer ring 37, and a plurality of detents 49 are formed on the outer ring accommodating portion 42. However, the present invention is not limited to this. One caulking protrusion may be formed on one outer ring 37. In this case, the outer ring housing portion 42 may be formed with one detent portion or a plurality of detent portions. The plurality of detent portions may be formed at different angular intervals.
(5) In the second embodiment, a plurality of first caulking protrusions 60 are formed on the outer ring 37 at equal angular intervals, and correspond to the angle of the first caulking protrusion 60 adjacent to the outer ring accommodating part 42. However, the present invention is not limited to this, and a plurality of caulking projections are formed on the outer ring 37 with different angular intervals, and the outer ring accommodating portion 42 includes A plurality of anti-rotation portions 49 may be formed at positions corresponding to the caulking protrusions.
(6) In the present embodiment, the number of the first caulking protrusions is two or four. However, the present invention is not limited to this, and a plurality of first caulking protrusions of three or more are formed. It is good also as a structure to be made.
(7) In the present embodiment, the outer ring 37 and the optical cord 18B are rotated by the first caulking protrusion 40 formed on the small-diameter portion 38 of the outer ring 37 and the anti-rotation portion 49 coming into contact with each other. However, the present invention is not limited to this, and the second caulking protrusion 41 formed in the large-diameter portion 39 of the outer ring 37 and the lower-side large-diameter receiving groove 45 or the upper-side large-diameter portion A configuration may be adopted in which rotation of the outer ring 37 and the optical cord 18 </ b> B is prevented by abutting the rotation preventing portion formed in the housing groove 46 from the circumferential direction of the outer ring 37.
(8) In the present embodiment, the optical connector is configured with the two optical cords 18B. However, the present invention is not limited thereto, and one optical cord may be configured with one optical connector. Moreover, it is good also as a structure by which three or more optical cords are distribute | arranged to one optical connector.

12: Female optical connector (optical connector)
13B ... Ferrule 16B ... Optical fiber 17B ... Sheath 18B ... Optical cord 24 ... Female housing (housing)
28 ... Lower housing 29 ... Upper housing 34 ... Tensile material 36 ... Inner ring 37 ... Outer ring 40 ... First caulking protrusion (caulking protrusion)
42 ... Outer ring accommodating portion 49 ... Detent portion 50 ... Recess

Claims (6)

An optical connector comprising a housing that accommodates a ferrule that is externally fitted to the tip of the optical fiber exposed from the end of an optical cord formed by covering the outer periphery of the optical fiber with a sheath,
A tensile strength material is interposed between the optical fiber and the sheath, and the tensile strength material exposed from the sheath caulks the outer ring while being sandwiched between an inner ring and an outer ring. And is clamped by the inner ring and the outer ring, and the outer ring is formed with a caulking protrusion that protrudes outward in the radial direction of the outer ring,
The housing is formed with an outer ring accommodating portion for accommodating the outer ring, and a circumferential force of the outer ring is applied to the inner wall of the outer ring accommodating portion with respect to the outer ring. An optical connector in which an anti-rotation portion that abuts against the caulking protrusion from a circumferential direction of the outer ring is formed. The optical connector according to claim 1, wherein the rotation preventing portion is an inner wall surface of a concave portion formed by being depressed in an inner wall of the outer ring housing portion. A plurality of the caulking protrusions are formed on the outer ring at equal angular intervals in the circumferential direction of the outer ring, and the inner wall of the outer ring housing part has an angular interval between the plurality of caulking protrusions. The optical connector according to claim 1, wherein a plurality of the detent portions are formed at the same angular interval. The housing includes a lower housing and an upper housing assembled to the lower housing, and the outer ring housing portion is provided between the lower housing and the upper housing by assembling the lower housing and the upper housing. The optical connector according to claim 1, wherein the optical connector is formed. The optical connector according to claim 4, wherein an outer peripheral surface of the outer ring is sandwiched between the lower housing and the upper housing in a state where the lower housing and the upper housing are assembled. The said crimping protrusion is the state accommodated in the said recessed part, and is pinched | interposed into the said rotation stop part formed in the inner wall face of the said recessed part from the circumferential direction both sides of an outer ring. The optical connector as described in any one of.

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