JP5695481B2 - Optical connection parts - Google Patents

Description

  The present invention relates to an optical connection component for connecting optical fibers, and particularly to an optical connection component having a coating removal function.

  An optical connection component that can position and connect a coated optical fiber with high accuracy by a simple connection operation is known (see Patent Document 1). The optical connecting component 500 shown in FIG. 9 is attached to a coated optical fiber 511 having a coating on the outer periphery of a glass fiber. The optical connection component 500 includes a short optical fiber 512 at the end, and a ferrule 520 having a glass fiber insertion hole 521 leading to the short optical fiber 512 and a glass fiber inserted into the glass fiber insertion hole 521. A fixing portion 550 for fixing the abutted coated optical fiber 511 and a coating removing portion 564 for removing the coating from the end of the coated optical fiber 511 by the insertion force of the coated optical fiber 511 are provided.

  A bending space 562 that can be accommodated in a state where the optical fiber 505 is bent is formed between the fixing portion 550 and the coating removal portion 564 of the optical connecting component 500. That is, the coated optical fiber 511 is accommodated while being bent in the bending space 562, and the coated optical fiber 511 is fixed in the fixing portion 550, whereby the glass fiber inserted into the glass fiber insertion hole 521 of the ferrule 520. An elastic biasing force toward the connection surface of the short optical fiber 512 built in the ferrule 520 is applied to the distal end surface of 505. Therefore, the connection state between the short optical fiber 512 and the optical fiber 505 is stably maintained.

  In the optical connection component 500 configured as described above, when the coated optical fiber 511 provided with a coating on the outer periphery of the glass fiber is inserted into the optical connection component 500, the coating removal unit 564 removes the coated optical fiber 511 from the end of the coated optical fiber 511. The glass fiber whose coating is removed and exposed at the end is inserted into the glass fiber insertion hole 521, and the coated optical fiber 511 is fixed by the fixing unit 550. Accordingly, it is not necessary to perform the coating removal work before inserting the optical connection component 500, and the coated optical fiber 511 is positioned with high accuracy on the basis of the outer periphery of the core fiber from which the coating is removed from the coated optical fiber 511. Then, it can be connected to the short optical fiber 512.

JP 2008-292709 A

  In the optical connecting component 500 described in Patent Document 1, the coated optical fiber 511 is inserted into the optical connecting component 500 in a state where the coated grip portion 570 attached to the coated optical fiber 511 is gripped. At this time, the coated optical fiber 511 is inserted in a no-load state until the tip of the coated optical fiber 511 comes into contact with the coating removal unit 564, but when the tip of the coated optical fiber 511 comes into contact with the coating removal unit 564, the coated light A buckling load is applied to the fiber 511, and the coated optical fiber 511 may be buckled between the rear of the fixed portion 550 and the covering grip portion 570 as shown in FIG.

  Specifically, when fixing the coated optical fiber 511 to the optical connection component 500, the coating gripping portion 570 of the coated optical fiber 511 is gripped and the tip of the coated optical fiber 511 is moved from the rear side of the optical connection component 500. Insert to butt position 568. At this time, the tip of the coated optical fiber 511 comes into contact with the coating removing unit 564 to remove the coating, and only the core fiber is inserted up to the butting position 568. Since the coating removal unit 564 is provided on the rear side of the butting position 568, the coating gripping unit 570 located near the rear of the fixing unit 550 when the two optical fibers 511 and 512 are butted as shown in FIG. At the start of the removal of the coating, it is further away from the rear end of the fixing portion 550.

  That is, when removing the coating, there is no member blocking the deformation of the coated optical fiber 511 in the side (the radial direction of the coated optical fiber 511) between the fixed portion 550 and the coated gripping portion 570. The attached optical fiber 511 can be freely deformed laterally. Therefore, buckling may occur in this region, and the coated optical fiber 511 may be disconnected, and it becomes difficult to insert the coated optical fiber 511, making it difficult to handle the optical connection component 500.

  The coated optical fiber 511 is less likely to buckle if the uninserted length of the coated optical fiber 511 between the rear end of the fixed portion 550 and the coated grip 570 at the time of coating removal is short. Bend. This uninserted length is determined according to the coating removal length and the bending length between the butt portion 514 and the coating removal unit 564. Of these, the coating removal length is a mechanical splice connection method using a V-groove, which is generally adopted as a fiber connection method, and a clamp length for clamping the fiber in the V-groove or a fiber removed from the V-groove. A taper for attracting the film is required, and a coating removal length of at least 3 mm or more is required. Also, the bending length is required to be 1 to 7 mm. As described above, since it is difficult to sufficiently shorten the uninserted length, some measures have been desired to prevent the coated optical fiber 511 from buckling.

  Accordingly, an object of the present invention is to provide an optical connection component having high reliability without the possibility of the coated optical fiber buckling when the coating is removed.

In order to solve the above problems, the present invention provides the following.
(1) An optical connection component for connecting a short optical fiber and a coated optical fiber to face each other,
A gripping part; a covering part provided forward of the gripping part and covering an outer periphery of the coated optical fiber; and a covering gripping part attached to the coated optical fiber;
A main body including a front hole portion through which the short optical fiber and the coated optical fiber are inserted, and a rear hole portion through which the coated optical fiber is inserted;
Behind the front hole is provided with a coating removing portion that contacts the front end of the coated optical fiber and removes the coating from the front end of the coated optical fiber,
The outer diameter of the protective part is smaller than the outer diameter of the grip part,
An optical connecting component comprising: a protective portion storing recess that stores the protective portion behind the rear hole portion and has a smaller diameter than the grip portion.
(2) The optical connection component according to (1), wherein an inner diameter of the protective part storage recess is not more than four times an inner diameter of the rear hole part.
(3) The optical connection component according to (1) or (2), wherein the main body is formed with a gripping portion fixing recess for fixing the gripping portion on the rear side of the protection portion storage recess.

Moreover, according to this invention, in order to solve the said subject, the following is provided.
(4) An optical connection component for connecting a short optical fiber and a coated optical fiber to face each other,
A coated gripping part that includes a gripping part and a flange that projects forward from the gripping part at a position spaced from the outer periphery of the coated optical fiber, and is attached to the coated optical fiber;
A main body including a front hole portion through which the short optical fiber and the coated optical fiber are inserted, and a rear hole portion through which the coated optical fiber is inserted;
Behind the front hole is provided with a coating removing portion that contacts the front end of the coated optical fiber and removes the coating from the front end of the coated optical fiber,
A protective hole having substantially the same diameter as the coated optical fiber is provided behind the rear hole,
The inner diameter of the flange is smaller than the outer diameter of the gripping part;
An optical connecting component, wherein a collar storage recess for storing the collar of the covering gripping part is formed outside the protective hole.
(5) The optical connection component according to (4), wherein an inner diameter of the collar housing recess is not more than four times an inner diameter of the rear hole.

  According to the optical connection component of the present invention, the covering grip portion attached to the coated optical fiber includes the protection portion provided in front of the grip portion and covering the outer periphery of the coated optical fiber, and the protection portion is provided behind the rear hole portion. Is provided with a protective part storage recess having a smaller diameter than the gripping part for storing. Therefore, when applying the insertion force to the coated optical fiber and removing the coating by the coating removing section, even if the coated optical fiber near the rear of the rear hole of the main body is deformed to the side, the portion deformed to the side Since it abuts against the inner wall of the protective part storage recess formed with a smaller diameter than the gripping part, large lateral deformation is prevented. Also, the coated optical fiber near the front of the gripping portion is prevented from being deformed laterally because the protective portion of the coated gripping portion covers the outer periphery of the coated optical fiber. Therefore, there is no risk of buckling and disconnection when the coated optical fiber is inserted, so that an optical connection component with high reliability can be provided.

  In addition, according to the optical connecting component of the present invention, the covering gripping portion includes a collar portion protruding forward from the gripping portion at a position separated from the outer periphery of the coated optical fiber, and the main body is covered behind the rear hole portion. A protective hole having substantially the same diameter as the optical fiber is provided. Therefore, when applying an insertion force to the coated optical fiber and removing the coating by the coating removing unit, the coated optical fiber near the back of the rear hole of the main body has its outer periphery covered with a protective hole. Deformation is prevented. Even if the coated optical fiber near the front of the gripping part is deformed to the side, the laterally deformed portion comes into contact with the inner wall of the collar part smaller than the outer diameter of the gripping part. Deformation is prevented. Therefore, since the coated optical fiber is not excessively deformed laterally when the coating is removed, there is no possibility of buckling and disconnection. Therefore, there is no risk of buckling and disconnection when the coated optical fiber is inserted, so that an optical connection component with high reliability can be provided.

It is sectional drawing which shows the optical connector which concerns on 1st Embodiment of this invention. It is sectional drawing of a coated optical fiber. It is an expanded sectional view showing the covering removal situation in a covering removal part. It is sectional drawing which shows the state before insertion of the optical fiber with a cover of the optical connector shown in FIG. It is sectional drawing which shows the state at the time of the coating removal of the optical connector shown in FIG. It is sectional drawing which shows the state at the time of provisional pre-deflection of the optical connector shown in FIG. It is sectional drawing which shows the optical connector which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the state at the time of the coating removal in the optical connector shown in FIG. It is sectional drawing which shows the conventional optical connector. It is sectional drawing which shows the buckling state of the optical fiber with a coating of the conventional optical connector.

<First Embodiment>
Hereinafter, an optical connecting component according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an optical connector which is an optical connection component according to the first embodiment. The optical connector 1 is a component that optically connects the coated optical fiber 11 and the short optical fiber 12 to each other.

  The optical connector 1 includes a connector main body (main body) 60, a ferrule 20 provided in front of the connector main body 60, and a covering gripping portion 70 fixed to the rear end of the connector main body 60. Here, the front and rear refer to the front and rear in the connection direction of the optical connector 1, for example, the front is the left side in FIG. 1 where the short optical fiber 12 is located, and the rear is the coated optical fiber 11. Means the right side in FIG.

  The short optical fiber 12 is inserted into the ferrule 20 and the connector main body 60, and a covering grip 70 is attached to the coated optical fiber 11 and inserted from the rear of the connector main body 60. The coated optical fiber 11 and the short optical fiber 12 are abutted at a butting position set in the connector main body 60 and both are optically connected.

  The ferrule 20 is formed in a cylindrical shape with a chamfered peripheral edge on the tip surface, and a fixed hole portion 21 is formed coaxially therein. The ferrule 20 may be a general zirconia ferrule used for optical communication. Since the ferrule 20 is made of zirconia, it is excellent in weather resistance and mechanical strength.

  The short optical fiber 12 has its end face polished and fixed to a fixing hole 21 formed in the ferrule 20 with an adhesive (not shown). The short optical fiber 12 fixed to the fixed hole portion 21 is led out from the rear portion of the ferrule 20 by a predetermined length, and is inserted into a butt hole portion 32 described later formed on the front side of the connector main body 60.

  The covering grip 70 is a member attached to the coated optical fiber 11 and is held at the rear end of the connector main body 60 in a state of being attached to the coated optical fiber 11 to fix the coated optical fiber 11 to the optical connector 1. To do. The covering gripping portion 70 includes a gripping portion 71 that is set to have a large diameter so that an operator can easily handle it, and a protection portion 72 that has a smaller diameter than the gripping portion 71 and covers the outer periphery of the coated optical fiber 11. It has a cylindrical shape. The covering grip 70 is attached to the coated optical fiber 11 such that the tip of the coated optical fiber 11 extends from the protection unit 72.

  The connector main body (main body) 60 includes a main body portion 30 extending along an insertion direction in which the coated optical fiber 11 is inserted, a flexure space forming portion 40 disposed to face the center in the longitudinal direction of the main body portion 30, and a main body. And a fixing portion 50 disposed to face the rear portion in the longitudinal direction of the portion 30.

  A ferrule holding recess 31 for holding the ferrule 20 is formed on the front end surface of the main body 30. The ferrule 20 that houses the short optical fiber 12 is fixed to the ferrule holding recess 31.

  Further, in the front region of the main body portion 30, a butt hole portion 32 that constitutes the front hole portion 61 together with the fixing hole portion 21 of the ferrule 20 is provided. A butting position where the short optical fiber 12 and the coated optical fiber 11 are butted is set in the butting hole 32, and the rear end of the short optical fiber 15 led out from the ferrule 20 by a predetermined length reaches the butting position. It has been extended.

  The main body portion 30 has a flat portion whose upper half is cut out in a flat shape, and the coated optical fiber 11 is guided to the butted hole portion 32 along the insertion direction of the coated optical fiber 11 in this flat portion. A V-groove 33 is formed. The coated optical fiber 11 inserted from the rear hole 63 is guided by the V groove 33 and introduced into the front hole 32.

  The bending space forming portion 40 is formed with a concave portion 41 that defines a bending space 62 together with the main body portion 30 and a rear hole 63 that is continuous from the rear end of the bending space forming portion 40. The coated optical fiber 11 inserted from the rear of the optical connector 1 communicates with the short optical fiber 12 at the butting position through the rear hole 63, the bending space 62, and the butting hole 32. At this time, since the coated optical fiber 11 is inserted in a bent state 62 as shown in FIG. 1, an elastic restoring force acts on the coated optical fiber 11 and the tip thereof is a short optical fiber 15. It is pressed to the side. Therefore, the connection state of the short optical fiber 12 and the core fiber 13 is stably maintained. In addition, it is preferable that the refractive index matching grease 68 is applied to the abutting position.

  Further, in this embodiment, the covering removal portion 64 is formed in the main body portion 30 and the bending space forming portion 40 that form the front hole portion 61 between the butting position and the bending space 62. The coating removing unit 64 removes the coating 14 from the tip of the coated optical fiber 11 by an insertion force applied when the coated optical fiber 11 is inserted into the optical connector 1. Further, a removal covering housing space 67 that can store the removed covering 14 is formed around the covering removing portion 64.

  A fixing portion 50 provided at the rear end of the connector main body 60 is a portion for fixing the coated optical fiber 11 to the optical connector 1. Specifically, the gripping portion 71 of the covering gripping portion 70 is fastened to the rear ends of the fixing portion 50 and the main body portion 30 by the fixing portion clamp 90 attached so as to sandwich the rear ends of the fixing portion 50 and the main body portion 30. The coated optical fiber 11 is fixed to the optical connector 1.

  In the connector main body 60, stepped recesses are formed in the inner walls facing each other at the rear ends of the fixing portion 50 and the main body portion 30, and as shown in FIG. 5, the outer diameter D 1 of the grip portion 71 of the covering grip portion 70. A holding portion fixing recess 65 (holding portion storing recess) 65 having substantially the same inner diameter D2 as that of the holding portion 71 and a protecting portion having an inner diameter D3 smaller than the outer diameter D1 of the holding portion 71 and capable of storing the protecting portion 72. A storage recess 66 is provided. The coated optical fiber 11 is fixed to the connector body 60 by being pressed by the fixing portion clamp 90 and the holding portion fixing recess 65 pressing the holding portion 71.

Prior to the description of the coating removing unit 64, an example of the coated optical fiber 11 will be described. FIG. 2 is a cross-sectional view of a coated optical fiber.
The coated optical fiber 11 has, for example, a core fiber 13 having an outer diameter d3 = 125 μm at the center, and a coating 14 having an outer diameter d1 = 250 μm is provided so as to cover the outer periphery thereof. The core fiber 13 is a glass fiber having a core and one or more layers of cladding, and a glass fiber having any refractive index distribution, such as a single mode fiber or a multimode fiber, is applicable.

  The coating 14 includes a primary 15 made of a jelly body or the like that is a first coating layer having an outer diameter d2 that is provided in the innermost layer and is in contact with the core fiber 13, and a secondary (outer coating) that covers the outside of the primary 15. However, the present invention is not limited to this, and the structure may be one layer or two or more layers. A colored layer 17 may be provided on the outermost layer of the secondary 16. The resin constituting the coating 14 is an ultraviolet curable resin such as urethane acrylate, and physical properties such as elastic modulus are appropriately set by additives. For example, the primary 15 in contact with the core fiber 13 has a lower elastic modulus (that is, softer) than the secondary 16.

  The degree of adhesion of the primary 15 is set smaller for the core fiber 13 than the secondary 16 (core fiber <secondary). That is, the coating 14 is easily peeled from the core fiber 13. Further, the Young's modulus of each member constituting the coated optical fiber 11 is set so that the core fiber 13 of the load support body is the largest, and then the secondary 16 and the primary 15 are reduced in this order (primary <secondary < Core fiber). Therefore, the coated optical fiber 11 is peeled and broken through the primary 15 by pressurizing the cut end face.

FIG. 3 is an enlarged cross-sectional view showing the coating removal state in the coating removal unit 64.
The coating removing unit 64 works to peel and remove the coating 14 from the tip of the core fiber 13 by pressing the cut end surface (tip surface) of the coated optical fiber 11. The inner diameter d of the butt hole 32 is set to be larger than the diameter d3 of the core fiber 13 and smaller than the outer diameter d1 of the coating 14. Moreover, the coating removal part 64 is formed in the cone shape which protruded the outer periphery of the butt | matching hole part 32 back. Accordingly, when the cut end surface of the coated optical fiber 11 is pressed against the coating removing portion 64, the periphery of the butt hole portion 32 of the coating removing portion 64 contacts the cut end surface of the coating 14 and does not contact the core fiber 13. It will be.

  With such a configuration, when the coated optical fiber 11 is inserted into the connector main body 60, compressive stress in the insertion direction can be applied to the distal end of the coated optical fiber 11, and simultaneously with the insertion of the coated optical fiber 11. The coating 14 can be removed. The front end of the core fiber 13 from which the coating 14 has been removed enters the butt hole 32 and contacts the rear end of the short optical fiber 12 as shown in FIG. That is, the short optical fiber 12 and the core fiber 13 from which the coating has been removed are optically connected within the butt hole 32. Since the optical connector 1 can remove the coating 14 simultaneously with the insertion of the coated optical fiber 11 in this way, the work at the site is simplified. Further, by forming the coating removal portion 64 in a cone shape, the coating removal is facilitated and the peeled coating 14 is easily moved outward.

  Next, a procedure for attaching the coated optical fiber 11 to the optical connector 1 will be described. 4 is a cross-sectional view of the optical connector 1 before insertion of the coated optical fiber 11, FIG. 5 is a cross-sectional view of the optical connector 1 when the coated optical fiber 11 is removed, and FIG. It is sectional drawing of the optical connector 1 of the state which provided.

  First, as shown in FIG. 4, the ferrule 20 in which the short optical fiber 12 is inserted is fixed to the ferrule holding recess 31 of the main body 30. The short optical fiber 12 is led out from the ferrule 20 by a predetermined length, and the extra length portion is inserted into the butted hole portion 32 of the main body portion 30. A refractive index matching grease 68 is applied to the insertion tip (rear end) of the short optical fiber 12.

  Moreover, the cover part clamp 80 is attached so that the bending space formation part 40 and the main-body part 30 may be pinched | interposed, and both may be pressed and fixed. Moreover, the fixing | fixed part clamp 90 is attached so that the fixing | fixed part 50 and the main-body part 30 may be pinched | interposed, and both may be pressed and fixed. The fixing portion clamp 90 is in a half-clamped state so that the coated optical fiber 11 and the covering gripping portion 70 can be inserted between the main body portion 30 and the fixing portion 50 in a later step. Further, at this time, a bending restricting member 85 having a bifurcated tip which narrows the bending space 62 is inserted between the main body portion 30 and the concave portion 41 of the bending space forming portion 40.

  Next, as shown in FIG. 5, the coated optical fiber 11 is inserted from behind the optical connector 1 by gripping the gripped portion 71 of the coated optical fiber 11 to which the coated gripping portion 70 is attached. The coated optical fiber 11 inserted from the rear of the optical connector 1 passes through the rear hole 63 and the bending space 62 and reaches the coating removal unit 64. At this time, the front end surface of the coated optical fiber 11 is further pressed against the coating removing unit 64, and the coating 14 of the coated optical fiber 11 is removed as described with reference to FIG.

  When the coating shown in FIG. 5 is removed, a compressive stress acts on the coated optical fiber 11 in the insertion direction, and the coated optical fiber 11 is deformed laterally between the rear hole 63 and the gripping portion 71. is there. However, even if the coated optical fiber 11 near the rear of the rear hole 63 is deformed to the side, it comes into contact with the inner wall of the protective portion storage recess 66 formed with a smaller diameter than the grip portion 71, Large deformation is prevented. Also, the coated optical fiber 11 near the front of the gripping portion 71 prevents the coated optical fiber 11 from being deformed laterally because the protective portion 72 of the coated gripping portion 70 covers the outer periphery of the coated optical fiber 11. Has been.

  That is, in the optical connector 1 according to the present embodiment, even when the coated optical fiber 11 is about to be deformed laterally when the coated optical fiber 11 is removed, the protective portion storage recess 66 or the protective portion serving as an obstacle is formed on the side. 72 is provided to prevent large lateral deformation. Accordingly, since the coated optical fiber 11 is not excessively deformed laterally when the coating is removed, it is possible to prevent the compressive stress acting in the insertion direction of the coated optical fiber 11 from excessively escaping to the side. . That is, since the compressive stress in the insertion direction can be reliably applied to the tip of the coated optical fiber 11, the coating 14 can be reliably removed simultaneously with the insertion of the coated optical fiber 11. Therefore, since there is no possibility that the coated optical fiber 11 is buckled and disconnected, the optical connector 1 with high reliability can be provided.

  In addition, the covering gripping portion 70 extends from the front end surface of the protecting portion storage recess 66 to the protecting portion 72 so that the covering optical fiber 11 is fixed between the main body portion 30 and the fixing portion 50 when the covering optical fiber 11 is attached to the optical connector 1. The length (uninserted length) L with respect to the front end is attached at a position where the distance L1 between the butting position and the coating removing portion 64 and the bending length α are combined (L = L1 + α). At this time, the length L2 in the insertion direction of the protection portion storage recess 66 is bent so that the inner wall of the protection portion storage recess 66 restricts the lateral deformation of the coated optical fiber 11 that has been deformed to the side when the coating is removed. It is preferable to set it equal to α (L2 = α).

  Further, in order to prevent the coated optical fiber 11 from being deformed excessively to the side, the inner diameter D3 of the protective portion storing recess 66 is the inner diameter D4 of the rear hole 63 (the outer diameter of the coating 14 of the coated optical fiber 11). It is preferable to set it to 4 times or less. In this embodiment, the protective portion storage recess 66 is formed by the inner wall of the fixing portion 50 and the recess provided at the rear end of the main body portion 30, but the V groove 33 provided at the rear end of the main body portion 30 and the fixing portion 50 are not provided. In the case where the protective portion storage recess 66 is formed by the recess provided on the inner wall, the diameter of the virtual inscribed circle inscribed in the recess on the V groove 33 and the fixed portion 50 side should be set to 4 times or less the inner diameter D4 of the rear hole 63. Is preferred. In this way, a compressive stress in the insertion direction sufficient to remove the coating 14 at the same time as insertion can be reliably applied to the tip of the coated optical fiber 11.

  Further, by continuing the insertion of the coated optical fiber 11, only the core fiber 13 is inserted into the butted hole 32 in the coated optical fiber 11 from which the coating 14 has been removed, as shown in FIG. 12 and the peeled coating 14 are accommodated in the removal coating accommodating space 67. After the tip of the core fiber 13 comes into contact with the rear end of the short optical fiber 12, the coated optical fiber 11 is further inserted to form the preliminary deflection 11 </ b> A in the bending space 62. After the preliminary deflection 11A is formed to a predetermined length, the main body portion 30 and the fixing portion 50 are completely clamped by the fixing portion clamp 90, and the coated optical fiber 11 is fixed to the optical connector 1.

  Thereafter, the bending regulating member 85 is pulled out to enlarge the bending space 62, and the bending state of the coated optical fiber 11 is relaxed, so that the optical connector 1 of the coated optical fiber 11 and the short optical fiber 12 as shown in FIG. Installation to is completed. Thus, since the coated optical fiber 11 is appropriately bent in the mounted state on the optical connector 1, the coated optical fiber 11 is always pressed to the short optical fiber 12 side, and the coated optical fiber 11 and the short light are used. Since there is little signal loss between the fibers 12 and the bending state is relaxed, there is no optical signal transmission loss due to the bending state of the coated optical fiber 11. Therefore, the optical connector 1 excellent in light transmission efficiency can be provided.

  In the present embodiment, the example in which the coating removing portion 64 is provided in the connector main body 60 has been described.

Second Embodiment
In the first embodiment described above, the stage including the gripping portion 71 in which the covering gripping portion 70 is set to have a large diameter and the protection portion 72 that is formed in a smaller diameter than the gripping portion 71 and covers the outer periphery of the coated optical fiber 11. Although an example in which the protective portion accommodating recess 66 and the gripping portion fixing recess 65 corresponding to the covering gripping portion 70 are formed at the rear end of the connector body 60 has been described, the present invention is limited to this shape. There is no.

  7 shows a cross-sectional view of the optical connector 100 according to the second embodiment of the present invention, and FIG. 8 shows a cross-sectional view of the optical connector 100 when the coating is removed. The optical connector 100 according to the second embodiment is different from the optical connector 1 according to the first embodiment described above only in the shape of the covering gripping part and the fixing part. Reference numerals are assigned and detailed description thereof is omitted.

  The covering grip 170 of the optical connector 100 according to the second embodiment includes a grip 171 formed with a large diameter so that an operator can easily handle it, and the grip 171 from a position away from the outer periphery of the coated optical fiber 11. The coated optical fiber 11 is attached to the coated optical fiber 11 so that the tip of the coated optical fiber 11 extends from the flange 172.

  An inner diameter D5 of the flange portion 172 is set smaller than an outer diameter D6 of the grip portion 171 in order to restrict lateral deformation of the coated optical fiber 11. The inner diameter D5 of the flange 172 is preferably set to be not more than four times the inner diameter of the rear hole 63 (the outer diameter of the coating 14 of the coated optical fiber 11) D7. In the present embodiment, the outer diameter of the flange 172 is set to be the same as the outer diameter of the gripping part 171, but the present invention is not limited to this shape.

  Further, behind the rear hole 63 of the connector main body 60, a protective hole 161 having an inner diameter substantially the same as the outer diameter of the coated optical fiber 11, and a flange of the cover gripping part 170 on the radially outer side of the protective hole 161 A collar storage recess 162 for storing the portion 172 is formed.

  Therefore, when the coated optical fiber 11 is attached to the optical connector 100, the coated optical fiber 11 is inserted into the protective hole 161, and the collar portion 172 of the sheath gripping portion 170 is moved into the collar storage recess 162 by the fixing portion clamp 90. The coated optical fiber 11 is fixed to the optical connector 100 by being pressed.

  Also in the second embodiment, when the coated optical fiber 11 is inserted into the optical connector 100 and the coating 14 is removed, the coated optical fiber 11 is laterally disposed between the rear hole 63 and the grip 171. May be deformed. However, as shown in FIG. 8, the coated optical fiber 11 in the vicinity of the rear of the rear hole 63 is covered with the protective hole 161, so that deformation to the side is prevented. Further, even if the coated optical fiber 11 near the front of the gripping portion 171 is deformed laterally, the inner wall of the flange portion 172 protruding forward from the gripping portion 171 at a position away from the outer periphery of the coated optical fiber 11 is contacted. Because of the contact, large lateral deformation is prevented. Accordingly, since the coated optical fiber 11 is not excessively deformed laterally when the coating is removed, it is possible to prevent the compressive stress acting in the insertion direction of the coated optical fiber 11 from excessively escaping to the side. . That is, since the compressive stress in the insertion direction can be reliably applied to the tip of the coated optical fiber 11, the coating 14 can be reliably removed simultaneously with the insertion of the coated optical fiber 11. Therefore, since there is no possibility that the coated optical fiber 11 is buckled and disconnected, the optical connector 100 with high reliability can be provided.

  As shown in FIG. 8, the covering grip 170 is disposed behind the protective hole 161 so that it is fixed between the main body 30 and the fixing unit 50 when the coated optical fiber 11 is attached to the optical connector 100. The length (uninserted length) 1 between the end surface and the front end surface of the grip portion 171 is the distance l1 between the abutting position of the coated optical fiber 11 and the short optical fiber 12 and the coating removal portion 64, and the deflection length β. Are attached at a position having a combined length (l = l1 + β). At this time, the insertion direction length l2 of the flange portion 172 is set to the uninserted length l so that the inner wall of the flange portion 172 regulates the lateral deformation of the coated optical fiber 11 that has been deformed laterally when the coating is removed. It is preferable to set them equally (l2 = 1).

DESCRIPTION OF SYMBOLS 1 Optical connector, 11 Covered optical fiber, 12 Short optical fiber, 20 Ferrule, 30 Main body part, 40 Lid part, 50 Fixing part, 60 Connector main body, 61 Front hole part, 62 Deflection space, 63 Rear hole part, 64 Cover Removing part, 65 Gripping part fixing concave part (gripping part storing concave part), 66 Protecting part storing concave part, 67 Removal covering housing space, 70 Covering gripping part, 71 Gripping part, 72 Protective part, 80 Lid part clamp, 90 Fixing part clamp, 100 optical connector, 161 protective hole, 162 collar storage recess, 170 covering grip, 171 grip, 172 collar

Claims (3)

An optical connection component for connecting a short optical fiber and a coated optical fiber to face each other,
A gripping part; a covering part provided forward of the gripping part and covering an outer periphery of the coated optical fiber; and a covering gripping part attached to the coated optical fiber;
A main body including a front hole portion through which the short optical fiber and the coated optical fiber are inserted, and a rear hole portion through which the coated optical fiber is inserted;
Behind the front hole is provided with a coating removing portion that contacts the front end of the coated optical fiber and removes the coating from the front end of the coated optical fiber,
The outer diameter of the protective part is smaller than the outer diameter of the grip part,
The protection part is stored behind the rear hole part and includes a protection part storage recess having a smaller diameter than the outer diameter of the grip part ,
The optical connecting component according to claim 1, wherein an inner diameter of the protective part storing recess is not more than four times an inner diameter of the rear hole part . The optical connection component according to claim 1 , wherein the main body has a gripping portion fixing concave portion that fixes the gripping portion on the rear side of the protection portion storing concave portion. When the front end of the coated optical fiber comes into contact with the coating removing portion, a space is formed between the coated portion of the coated optical fiber and the protective portion storing recess in front of the protective portion. The optical connecting component according to claim 1 or 2 .

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