JP3306410B2 - Optical connector plug, method of manufacturing the same, and assembly tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical connector plug attached to one end of an optical cord for connecting an optical cord containing an optical fiber, a method of manufacturing the same, and an assembling tool therefor.

[0002]

2. Description of the Related Art FIG. 18 shows the structure of a single-core optical cord 80 having a built-in tensile strength member.

The optical cord 80 incorporates an optical fiber core 85 made up of an optical fiber 81 comprising a central core portion and an outer clad portion, and an optical fiber coating (inner jacket) 83 covering the optical fiber 81. are doing. Further, the optical cord 80 is provided with a cord sheath 84 that further covers the optical fiber core 85, and a tensile member 82 interposed between the optical fiber core 85 and the cord sheath 84.

[0004] As a conventional method for manufacturing an optical cord with a connector plug in which an optical connector plug is coupled to the tip of this type of optical cord, for example, JIS C 5973 is used.
Reference 2 of "F04 type single core optical fiber connector" includes "Method of connecting a cable of an optical connector (plug) (example)".

In this prior art, after an optical fiber 81 is attached to a ferrule, parts are assembled as needed, and then a tensile member 82 and a cord sheath 84 of an optical cord 80 are fixed. To FIG.
Shown in

Step 1-1 (FIG. 19 (a)): Necessary parts (boots 100, cord outer fastener 101, caulking ring 102, stop ring 103, coil spring 104)
Step 1-2 (FIG. 19 (a)): After terminating the optical cord 80, the tensile member 82 is temporarily fixed by temporary fixing means 105 such as tape. 19 (b) (c)): Fix the ferrule 106 to the optical fiber 81 and polish the end faces of the optical fiber 81 and the ferrule 106. Step 1-4 (FIG. 19 (c)): Pre-assemble the parts (ferrule) The front housing 107 is moved from the front of the ferrule 106 and the coil spring 104 is moved from the rear of the ferrule 106.
Step 1-5 (FIGS. 19 (d) and (e)): Remove the temporary fixing means 105, move the caulking ring 102 forward, and caulk the tensile member 82. It is fixed by 102 and a stop ring 103. The cord outer fixing tool 101 is moved forward, and the cord outer fixing tool 10 is
By caulking 1, the cord sheath 84 of the optical cord 80 is fixed to the caulking ring 102 and the cord sheath fixture 101. Step 1-6: (FIG. 19 (f) (g) (h)) (Complete by attaching boots 100 and knob 107).

As another example, there is a structure in which a tensile member 82 and a cord sheath 84 are directly fixed to a ferrule 106 to simplify the assembly of a plug. In this case, the steps are as follows, for example.

Step 2-1: Inserting an optical code into necessary parts Step 2-2: Terminal treatment of the optical code Step 2-3: Fixing the ferrule to the optical code Step 2-4: Tensile member and outer skin on the ferrule Step 2-5: Assembling of parts (predetermined parts are joined from the front and rear of the ferrule).

However, in the latter structure, since the tensile member 82 and the cord sheath 84 are directly fixed to the ferrule, when the cord sheath 84 is pulled from the rear, for example, the external force is applied to the ferrule, and Position shifts from the predetermined position,
The optical characteristics may be degraded. In particular, in the case of connection between single mode fibers used for high-speed and large-capacity optical communication, the ferrules of the connected optical fibers are in close contact with each other, and there is no gap between the end faces of the optical fibers. Like that. When the optical cord 80 is pulled, this force acts on the ferrule holding the cord, and when the ferrule retreats, a gap is formed as a result, resulting in a connection loss and a deterioration in return loss. Therefore, the latter structure is not generally used for such high-speed and large-capacity optical communication.

[0010] In the former structure, the tensile member 82 and the cord sheath 84 are not fixed to the ferrule 106, and the other caulking ring 102 and the cord sheath fixture 1 are not fixed.
01, stop ring 103, front housing 10
7. It is fixed to the knob 107. Therefore, when the optical cord 80 is pulled, a tensile force acts on these components and is received by a fixed part on the other side, such as a housing, which is coupled to the connector plug. Accordingly, the tensile force does not directly act on the ferrule 106, so that the connection characteristic does not deteriorate due to the displacement of the ferrule 106.

[0011]

In the former conventional example, the "fixing of the tensile strength member and the cord outer cover" in the step 1-5 is performed as follows.
This is after "fixing the ferrule to the optical fiber" in step 1-3 and "pre-assembly of parts" in step 1-4. Step 1
-3 and steps 1-5 are more complex than the other steps,
In many cases, it is manually performed. Further, the steps 1-4 are relatively easily automated. Considering automatic assembly, etc., the process 1-3
When the steps 1-5 and the step 1-5 are made continuous, the production efficiency can be improved and the cost of the assembling operation can be reduced. However, in the structure of the conventional optical connector plug, the tensile member 82 and the outer sheath 84 are caulked 102 and the cord outer fastener 101 is used.
, The structure is fixed to the assembly part in the step 1-4, that is, the stop ring 103. Therefore, the step 1-4 is inevitably inserted before the step 1-5, and the steps 1-3 and 1-5 are necessarily performed. Could not be a continuous process.

In the latter prior art, "fixing the ferrule to the optical cord" in step 2-3 and "fixing the tensile member and the outer skin to the ferrule" in step 2-4 are continuous. Although desirable for efficiency, when the optical cord 80 is pulled as described above, there is a possibility that external force acts directly on the ferrule to cause deterioration of connection characteristics. There was a disadvantage that it could not be used.

Further, in the prior art, a cord sheath 84 is provided.
When the tension member 82 and the tensile strength member 82 are fixed by caulking, a method is generally used in which the tensile strength member 82 and the cord outer cover 84 are attached to an outer peripheral portion such as a stop ring, and then covered and secured by a caulking member. In this case, since a portion for fixing the tensile strength member 82 and the cord cover 84 in the stop ring or the like needs to withstand the force of caulking, these components are often formed of metal.

Further, as a plug structure for achieving automation or simplification of assembly, there are a structure in which a coil spring is incorporated in a ferrule, and a structure in which these are incorporated in a housing. Here, when the optical fiber is fixed to the ferrule, an adhesive is usually used. However, in the optical connector which has been simplified as described above, the state where the coil spring is incorporated in the ferrule or the state where these are incorporated in the housing is used. In some cases, an optical cord or a tensile member is fixed to a housing or the like with an adhesive. Therefore, in the case of such a simplified plug, it is necessary to pay close attention so that the adhesive does not stick to parts other than the ferrule or a predetermined member for fixing the tensile strength member. For this reason,
In many cases, this is achieved by using a microdispenser for applying the adhesive or a special adhesive injection member. This is because if the adhesive is attached to parts other than the ferrule or the like, various malfunctions may occur.

The present invention has been made in view of the above-mentioned problems, and is an optical connector plug having a simple configuration and a structure that does not deteriorate in characteristics even when subjected to an external force such as pulling, and is easy to assemble. It is an object of the present invention to provide an optical connector plug having a structure suitable for automatic assembly.

Further, the present invention provides a structure in which parts can be manufactured at low cost by molding plastics when mass production is required in the future, and an optical connector plug can be easily assembled and automation can be achieved. The purpose is to provide.

Further, according to the present invention, various parts can be reliably assembled without deteriorating optical characteristics and the like.
It is another object of the present invention to provide an optical connector plug assembling tool capable of improving the efficiency and economy of assembling work.

[0018]

According to the present invention to achieve the above object, an optical connector plug has a front housing, a rear housing, a ferrule, a coil spring, and an optical cord fixing member. In addition to the ferrule and the coil spring, an optical cord fixing member for fixing the tensile strength member and the cord outer cover is accommodated in an internal through space generated when the front housing and the rear housing are connected to each other and held at predetermined positions. Like that. Further, when assembling the optical connector plug using these members, the structure is such that the incorporation of these members can be realized by axial movement as much as possible.

That is, an optical connector plug according to a first aspect of the present invention is an optical connector plug comprising an optical fiber having an optical fiber and an optical fiber coating covering the optical fiber, a cord sheath further coating the optical fiber core, An optical connector plug for connecting an optical cord having an optical fiber and a tensile strength member interposed between the cord outer sheath, a front housing disposed in the front in the optical axis direction,
A rear housing coupled to the front housing and disposed rearward in the optical axis direction of the front housing; a ferrule; a coil spring; and an optical cord fixing member, wherein the ferrule fixes and positions the optical fiber of the optical cord. Optical fiber positioning and fixing part
A flange portion that is biased and held in contact with the coil spring in the front housing, wherein the coil spring has a front end on the front surface for contacting and biasing the flange portion of the ferrule; A spring having a rear end for contacting the housing and having a predetermined inner diameter and an outer diameter;
One or a plurality of members, a member having a fixing structure of the optical cord according to the structure of the optical cord to be used, at least after the optical cord is incorporated and fixed, the coil spring A member having an outer diameter capable of being inserted and having a hole having an inner diameter capable of inserting the optical cord, wherein at least a part of the outer peripheral surface has a locking means for locking to an inner surface of the rear housing, The front housing is a member composed of one or a plurality of members, and is a housing having coupling means for coupling with the rear housing, and a through hole, wherein at least a tip of the through hole has a ferrule optical fiber. A hole having an inner surface larger than the outer shape of the optical fiber positioning fixing portion for projecting the positioning fixing portion, and a hole formed subsequently to this portion. A flange portion holding portion having a ferrule pop-out prevention structure that partially interferes with the flange portion of the ferrule, and a housing in which a rear through-hole portion having an inscribed circle larger than the outer shape of the coil spring is formed. A housing comprising at least one locking member for coupling to a front housing and at least a through hole, wherein the locking device moves the rear housing forward. A locking means having a structure in which the front housing and the rear housing are connected to each other, wherein the rear end side of the through hole has an inner diameter larger than the outer diameter of the optical cord and smaller than the inscribed circle of the outer shape of the optical cord fixing member. A fiber insertion hole is formed, and a hole shape larger than the fiber insertion hole follows the fiber insertion hole in front of the fiber insertion hole. An optical cord fixing member holding portion having an inner shape larger than the optical cord fixing member and having fixing means for holding and fixing the optical cord fixing member is formed, and a coil spring is provided at a tip end side of the through hole. A coil spring holding portion for holding and biasing the rear end of the coil spring is formed, and an inner surface shape between the coil spring holding portion and the optical cord fixing member holding portion that is larger than a cross-sectional shape perpendicular to the axis of the outer shape of the optical cord fixing member. A housing formed with an optical cord fixing member introduction hole as a through hole,
A structure in which a through space is formed inside with the front housing and the rear housing joined to each other,
The front end of the optical fiber positioning and fixing portion of the ferrule, in which the optical fiber of the optical cord is fixed in the through space, protrudes from the front end of the front housing, and the flange portion regulates the axial position by the ferrule protrusion prevention structure of the front housing. The ferrule is held in a state in which the flange portion of the ferrule is urged forward at the tip of the coil spring, and the coil spring is urged forward by the coil spring holding portion of the rear housing to fix the optical cord of the rear housing. The optical cord fixing member in which the optical code is fixed to the member holding portion is formed so as to be fixed and held.

According to a second aspect of the present invention, in the first aspect of the invention, the optical cord fixing member has a caulking seat and a caulking ring, and the caulking seat is an inscribed circle larger than an outer diameter of the optical fiber. Is a member having a through-hole and a tensile member fixing portion is formed on the outside, and the caulking is a member formed with a through-hole having an inscribed circle having a diameter larger than the outer diameter of the tensile member fixing portion of the caulking seat. A tension member fixing portion and a cord outer skin fixing portion are formed inside, and the optical fiber core wire is passed through the caulking seat, and the caulking seat is brought to the end of the exposed cord outer skin, and then the exposed tensile strength member is swaged. A caulking ring is attached to the tension member fixing portion of the seat, and a caulking ring is applied so as to cover an end portion of the caulking seat along the tensile strength member and the cord outer skin, and further, a tensile strength member fixing portion of the caulking ring and a cord outer skin fixing portion. The by caulking, characterized in that so as to secure the crimping seat and caulking ring strength members and code skin.

According to a third aspect of the present invention, in the first aspect of the present invention, a fixing portion for adhering and fixing a tensile member is formed on an outer peripheral portion of the optical cord fixing member, and the tensile member is attached to the optical cord fixing member with an adhesive. It is characterized by being fixed to.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, at least a part of the outer cross section of the optical cord fixing member has a polygonal shape with rounded corners. A light that is a part of the inner diameter cross-sectional shape of the optical cord fixing member holding portion of the rear housing and at least a part of the housing portion of the optical cord fixing member of the rear housing has a polygonal shape with rounded corners. The optical cord fixing member has a substantially circular shape having substantially the same size as a circumscribed circle of the cord fixing member, and has a cross-sectional shape having a surface obtained by cutting at least a part of the circle. It is characterized in that an anti-rotation structure is formed so as not to be held.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the optical cord is provided in a through hole which is in communication with the optical cord fixing member holding portion of the rear housing and is opposite to the optical cord insertion hole. A fixing member rotation restricting portion for restricting rotation of the fixing member is provided, and the fixing member rotation restricting portion has a substantially circular inner surface shape on the rear end side and specifically has a surface obtained by cutting at least a part of the circle. A cross-sectional shape, and a shape of the inner surface on the distal end side is a shape connected to a circumscribed circle of the optical cord fixing member, and an inner shape of an intermediate portion located between the rear end side and the distal end side is a continuous shape of these two inner surfaces. It is characterized in that it has a structure that connects to

According to a sixth aspect of the present invention, in the first aspect of the present invention, a convex portion is provided on an inner surface of a hole of the optical cord fixing member holding portion of the rear housing, and the optical cord fixing member is provided. The optical cord fixing member is fixed to the rear housing by interference with the outer surface of the optical cord fixing member when housed in the hole of the optical cord fixing member holding portion.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the inner surface shape of the coil spring holding portion of the rear housing is substantially equal to the outer shape of the coil spring, and A convex portion is provided, and the coil spring is fixed to the rear housing by interference between an outer surface of the coil spring and the convex portion when the coil spring is housed in the coil spring holding portion.

According to an eighth aspect of the present invention, in any one of the first to seventh aspects of the present invention, the means for locking the rear housing and the front housing is provided on one of the rear housing and the front housing and is engaged with the tip. It is characterized by a structure comprising a cantilever having a stop projection and a locking hole provided in the other of the rear housing or the front housing and into which the locking projection is inserted.

According to a ninth aspect of the present invention, in the invention according to any one of the first to eighth aspects, the rear housing has a rear housing main body and a boot coupled to a rear portion of the rear housing main body. It is characterized in that the rear housing body and the boot are integrated in advance.

According to a tenth aspect of the present invention, in the first aspect of the present invention, the front housing comprises a front housing main body and a knob for covering the front housing main body. It is characterized in that it has a structure in which the knob is slidably integrated in advance.

According to an eleventh aspect of the present invention, in the invention according to any one of the first to tenth aspects, the optical cord fixing member has at least an optical cord incorporated therein and a tensile strength member and a cord outer cover are fixed to the optical cord fixing member. Later, it is a member having a circumscribed circle smaller than the inner diameter of the coil spring.

According to a twelfth aspect of the present invention, in the first aspect of the present invention, the optical cord fixing member has a substantially polygonal cross section, and one or a plurality of inner surfaces of a hole of the optical cord fixing member holding portion of the rear housing. And a substantially planar wall for restricting rotation of the polygonal optical cord fixing member.

According to a thirteenth aspect of the present invention, in the twelfth aspect, the rotation of the optical cord fixing member is restricted on an inner surface of a portion of the rear housing leading to the optical cord fixing member holding hole in the optical cord fixing member introduction hole. The height and the regulation area of the regulation portion continuously increase as going backward, and the rotation regulation portion has a substantially flat surface formed on the inner surface of the hole of the optical cord fixing member holding portion. It is characterized by being connected to the wall.

According to a fourteenth aspect of the present invention, there is provided an optical fiber, comprising a front housing, a rear housing coupled to the front housing, a ferrule, a coil spring, and an optical cord fixing member, and an optical fiber covering the optical fiber. An optical connector plug for connecting an optical cord having an optical fiber core having a cord outer sheath that further covers the optical fiber core, and a tensile strength member interposed between the optical fiber core and the cord outer sheath. The ferrule has an optical fiber positioning and fixing portion for positioning and fixing an optical fiber at a tip portion of an optical fiber core of the optical cord, and a flange portion which is urged in contact with the coil spring, wherein the coil spring is A tip for contacting and biasing the flange of the ferrule, and contacting the rear housing; The optical cord fixing member has a rear end portion for having a predetermined inner diameter and an outer diameter, and has an outer diameter that can be inserted into the coil spring when the optical cord is fixed, and A hole having an inner diameter through which an optical cord can be inserted; and a locking means for locking the rear housing on at least a part of the outer peripheral surface, wherein the front housing is locked for locking the rear housing. Means,
A first through hole, the first through hole having a larger inner diameter than the outer diameter of the optical fiber positioning and fixing portion of the ferrule, and a second through hole formed following the distal side hole. A middle hole having a flange portion holding portion for regulating forward movement of the flange portion of the ferrule and accommodating the flange portion, and a rear side hole having an inner diameter larger than the outer diameter of the coil spring, The rear housing,
The rear housing and the front housing are relatively close to each other, and have a locking means coupled to the locking means of the front housing; and a second through hole, and a rear end of the second through hole. An optical code insertion hole having an inner diameter through which the optical code can be inserted and the optical code fixing member cannot be inserted is formed on the side, and fixing means for fixing the optical code fixing member is provided in front of the optical code insertion hole. An optical cord fixing member holding hole for accommodating the optical cord fixing member is formed following the optical cord insertion hole;
A coil spring holding portion that holds the coil spring and urges the rear end of the coil spring is formed on the tip side of the through hole, and between the coil spring holding portion and the optical cord fixing member holding hole,
An optical cord fixing member introduction hole through which the optical cord fixing member can be inserted is formed, and the front housing and the rear housing are connected to each other, and a through space is formed inside these housings. The front end of the optical fiber positioning and fixing portion of the ferrule protrudes from the front end of the front housing, the forward movement is restricted by the flange portion holding portion of the front housing, and the flange portion is forwardly moved by the distal end portion of the coil spring. The ferrule is held in the urged state, the coil spring is urged forward by the coil spring holding portion of the rear housing, and the optical cord fixing member in which the optical code is fixed in the optical cord fixing member holding hole of the rear housing is provided. A ferrule in the through space so as to be fixedly held;
The coil spring and the optical cord fixing member are accommodated.

Further, in the method for manufacturing an optical connector plug according to the present invention, as set forth in claim 15, an optical fiber having an optical fiber, an optical fiber coating for coating the optical fiber, and an optical fiber core A method of manufacturing an optical connector plug for connecting an optical connector plug to an optical cord having a cord outer sheath that further covers the optical fiber and a tensile strength member interposed between the optical fiber core wire and the cord outer cover. A first step of passing a coil spring, a second step of exposing the optical fiber core and the tensile member at the end of the optical cord, and fixing the optical cord fixing member by fixing the tensile member and the cord sheath by an optical cord fixing member. The third step of fixing the optical cord to the optical cord and the relative distance between the fixed optical cord fixing member are set in advance. A fourth step of fixing the ferrule to the tip of the optical fiber core so as to be at a predetermined interval, forming a code pre-assembly part to which the optical cord fixing member and the ferrule are fixed, the code pre-assembly part and the coil spring And a fifth step of connecting the front housing and the rear housing by moving in the front-rear direction so as to incorporate the front housing.

According to a sixteenth aspect of the present invention, in the manufacturing method of the fifteenth aspect, the fourth step is characterized in that a ferrule flange is formed in a through space formed inside when the front housing and the rear housing are joined to each other. The ferrule and the coil spring are held in a state where the portion is urged forward by the coil spring, and the coil spring is urged forward by the coil spring holding portion of the rear housing to hold the optical cord fixing member in the optical cord fixing member holding hole of the rear housing. The ferrule is fixed to the distal end of the optical fiber so that the ferrule is separated from the fixed optical cord fixing member by a relative distance between the ferrule and the optical cord fixing member corresponding to the set state. .

According to a seventeenth aspect of the present invention, in the invention of the fifteenth or sixteenth aspect, in the fourth step, a process including end polishing of the ferrule end face is executed.

According to the eighteenth aspect of the present invention, there is provided an optical fiber having an optical fiber and an optical fiber coating for coating the optical fiber, a cord jacket for further coating the optical fiber core, and the optical fiber core and the cord. In a method for manufacturing an optical connector plug for connecting an optical connector plug to an optical cord having a tensile member interposed between the outer cover and an outer cord,
First to pass the rear housing and coil spring through the optical cord
Step, a second step of exposing the optical fiber core and the tensile member at the end of the optical cord, a third step of fixing the ferrule to the tip of the optical fiber core, and a relative distance between the fixed ferrule and The optical cord fixing member is fixed to the optical cord by fixing the tensile strength member and the cord outer cover with the optical cord fixing member so as to have a predetermined interval, and the optical cord fixing member and the ferrule are fixed. A fourth step of forming a pre-assembly part, and a fifth step of connecting the front housing and the rear housing by moving in the front-rear direction so as to incorporate the code pre-assembly part and the coil spring.
And a step.

According to a nineteenth aspect of the present invention, in the fourth aspect of the invention, in the fourth step, the flange portion of the ferrule is formed in a through space formed inside when the front housing and the rear housing are joined to each other. The ferrule and the coil spring were held in a state of being urged forward by the coil spring, and the coil spring was urged forward by the coil spring holding portion of the rear housing to hold the optical cord fixing member in the optical cord fixing member holding hole of the rear housing. The optical cord fixing member is fixed to the optical cord so as to be separated from the fixed ferrule by a relative distance between the ferrule and the optical cord fixing member corresponding to the state.

According to a twentieth aspect of the present invention, in the invention of the eighteenth or nineteenth aspect, in the third step, a process including terminal polishing of an end face of the ferrule is executed.

According to a twenty-first aspect, in the eighteenth or nineteenth aspect, in the fourth step, a process including end polishing of the ferrule end face is executed.

According to a twenty-second aspect of the present invention, there is provided an optical fiber having an optical fiber and an optical fiber covering the optical fiber, a cord sheath further covering the optical fiber, the optical fiber and the cord. The ferrule and the optical cord fixing member for fixing the optical cord are separated from the optical cord having the tensile strength member interposed between the ferrule and the optical cord by a predetermined interval where the ferrule and the optical cord fixing member are set. Optical connector plug assembling tool used for fixing the optical cord fixing member, the optical cord fixing member holding means for holding the optical cord fixing member to which the tensile strength member of the optical cord and the cord outer sheath are fixed, and the optical cord fixing member holding The ferrule is separated from the optical cord fixing member held by the means by a distance corresponding to the predetermined distance. And a ferrule holding means for holding and positioning the ferrule, characterized in that with respect to the ferrule held by the ferrule holding means is to perform the bonding and fixing of the optical fiber of the optical code.

According to a twenty-third aspect of the present invention, there is provided an optical fiber having an optical fiber and an optical fiber coating for coating the optical fiber, a cord sheath for further coating the optical fiber core, and the optical fiber core and the cord. The ferrule and the optical cord fixing member for fixing the optical cord are separated from the optical cord having the tensile strength member interposed between the ferrule and the optical cord by a predetermined interval where the ferrule and the optical cord fixing member are set. Tool for assembling an optical connector plug, the ferrule holding means for holding a ferrule to which the optical fiber of the optical cord is adhesively fixed, and the optical fiber with respect to the ferrule held by the ferrule holding means. Position the optical cord fixing member so that the cord fixing member is separated by a distance corresponding to the predetermined interval. Optical cord fixing member holding means for holding the optical cord fixing member, and the fixing process of the tensile strength member and the cord outer cover of the optical cord is performed on the optical cord fixing member held by the optical cord fixing member holding means. It is characterized by.

According to a twenty-fourth aspect of the present invention, there is provided an optical fiber, an optical fiber core having an optical fiber coating for coating the optical fiber, a cord sheath for further coating the optical fiber core, and the optical fiber core and the cord. An optical connector using a cord pre-assembly component in which a ferrule and an optical cord fixing member for fixing the optical cord are fixed so as to be separated from each other by a predetermined distance with respect to an optical cord having a tensile strength member interposed between the outer cover and the tensile strength member. In an optical connector plug assembling tool for assembling a plug, a front housing holding means for holding a front housing and a ferrule or an optical cord fixing member of the code preassembly component are held in front of a ferrule of the code preassembly component. Assembly holding means and the code pre-assembly component Rear housing holding means for holding the rear housing in which the optical cord is inserted and provided with the coil spring on the rear side of the optical cord fixing member of the code pre-assembly component and movable in the front-rear direction; And a frictional resistance applying means for applying a frictional resistance to the optical cord on the side, and by moving the rear housing holding means forward, the front side with the built-in ferrule, optical cord fixing member and coil spring is provided. The rear housing is engaged with the housing.

According to a twenty-fifth aspect of the present invention, there is provided an optical fiber, an optical fiber core having an optical fiber coating for coating the optical fiber, a cord sheath for further coating the optical fiber core, the optical fiber core and the cord. An optical connector using a cord pre-assembly component in which a ferrule and an optical cord fixing member for fixing the optical cord are fixed so as to be separated from each other by a predetermined distance with respect to an optical cord having a tensile strength member interposed between the outer cover and the tensile strength member. In an assembling tool for an optical connector plug for assembling a plug, an assembly holding means for holding a ferrule or an optical cord fixing member of the code pre-assembly component, and an optical code of the code pre-assembly component are inserted and a coil spring is provided. The rear housing is used for the optical cord fixing member of the code pre-assembly part. A rear housing holding means for holding the front housing, a cord pulling means for pulling the optical cord behind the rear housing holding means, and a front housing for holding the front housing on the front side of the ferrule of the cord pre-assembly part. The ferrule, the optical cord fixing member and the coil spring are built in by moving the front housing holding means backward and pulling the optical cord backward by the cord pulling means. In this state, the front housing is engaged with the rear housing.

According to a twenty-sixth aspect of the present invention, an optical fiber, an optical fiber core having an optical fiber coating for coating the optical fiber, a cord sheath for further coating the optical fiber core, the optical fiber core and the cord An optical connector plug connected to an end of an optical cord having a tensile member interposed between the outer cover and a ferrule, the ferrule having a flange portion and fixing an optical fiber exposed at an end of the optical cord. An optical cord fixing member for fixing an exposed tensile member and an outer cord of the optical cord at a rear side of the ferrule, and a coil spring which is capable of inserting the optical cord and whose tip abuts a flange portion of the ferrule. And a through hole and a ferrule loaded in the through hole are held inside the housing so that the tip of the ferrule projects from the front opening. A front housing having a holding portion, a through hole, a spring locking portion for locking a rear end of the coil spring mounted on a front side of the through hole, and an optical cord inserted from the front to a rear portion of the through hole An optical cord fixing member engaging portion for engaging the fixing member, and a rear housing engageable with the front housing, wherein the optical cord fixing member can be inserted through the inside of the coil spring and the rear housing The ferrule, the coil spring, and the optical cord fixing member are accommodated and fixed inside the engagement between the front housing and the rear housing.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

(Description of the Invention Corresponding to Claims 1, 14, and 26) FIGS. 1 and 2 show an embodiment in which the present invention is applied to an MU-type optical connector plug in a partial cross-sectional view.

FIG. 1 shows a connector plug 9 of a type which is connected to an adapter or the like by a locking projection K, and FIG. 2 shows a connector plug 9 of a push-pull connection structure.

The optical connector plug 9 shown in FIGS.
Is for forming the end of the single-core type optical cord 80 shown in FIG. As shown in FIG. 18, the optical cord 80 includes an optical fiber core 85 composed of an optical fiber 81 and an optical fiber coating (inner jacket) 83, a cord outer sheath 84, and a tensile member 82.

The optical connector plug 9 shown in FIGS. 1 and 2 includes a front housing 1, a rear housing 2, which is connected to the front housing 1, and is disposed rearward of the front housing 1 in the optical axis direction, a ferrule 3, and a coil spring. 4 and an optical cord fixing member 5.

FIGS. 3A to 3D show the structure of the ferrule 3. FIG. 3B is a left side view of FIG. 3A, FIG. 3C is a right side view of FIG. 3A, and FIG. 3D is a cross-sectional view of FIG. 3A.

As shown in FIGS. 3A to 3D, the ferrule 3 comprises an optical fiber positioning / fixing portion 31 for fixing / positioning the optical fiber 81 in a hole formed therein with, for example, an adhesive. The front housing 1 includes a flange portion 32 which is in contact with the coil spring 4 and is urged and held forward in the optical axis direction, and a core wire guide hole 33 into which an optical fiber core 85 is inserted.

FIG. 4 shows the structure of the coil spring 4.

As shown in FIG. 4, the coil spring 4 has a front end 41 for contacting and biasing the ferrule 3 and a rear end 42 for contacting the rear housing 2. It has an inner diameter Di and an outer diameter Do.

FIGS. 5A to 5E show the optical cord fixing member 5.
FIG.

The optical cord fixing member 5 is shown in FIGS.
As shown in (e), the cord outer sheath 84 and / or the tensile member 82 of the optical cord 80 are fixed according to the structure of the optical cord 80 to be used, which is composed of one or a plurality of members. It has a structure 51. The optical cord fixing member 5 has an outer diameter D5o smaller than the inner diameter Di of the coil spring 4 after the optical cord 80 is assembled and fixed.

Therefore, even after the optical cord 80 is fixed to the optical cord fixing member 5, the optical cord fixing member 5 can be inserted into the coil spring 4.

Further, since the optical cord fixing member 5 has a structure having an inner diameter D5i larger than the outer diameter Df of the optical fiber core 85, the tensile strength member 82 and the cord outer sheath 84 of the optical cord 80 are connected to the optical cord. Even after the optical fiber core 85 is fixed to the fixing member 5, the axial movement of the optical fiber core 85 is not hindered by the optical cord fixing member 5.
That is, when the cord outer sheath 84 and the tensile strength member 82 are firmly fixed to the optical cord fixing member 5, even if the cord outer sheath 84 is pulled from behind, the optical fiber core 85 itself is not attached. No force is applied and the optical fiber core 85 is not broken.

Since the optical fiber core 85 is not fixed, the optical fiber is a so-called loose type optical cord which is not fixed in the axial direction to the cord sheath 84 or the tensile member 82. Even when the ferrule 3 fixing the optical fiber core 85 is slightly moved in the axial direction in the optical connector plug 9 when the optical connector plug is used, the optical fiber core 85 is moved in accordance with the movement of the ferrule 3. The optical fiber 80 can be moved within the optical cord 80, so that the optical fiber core 85 is not bent or excessively pulled in the optical connector plug 9.

Further, the optical cord fixing member 5 is provided with a locking portion 511 for locking the inner surface of the rear housing 2 on at least a part of the outer peripheral surface. As will be described later, this portion 511 is locked by a convex portion 241 formed on the inner peripheral surface of the optical cord fixing member holding portion (optical cord fixing member holding hole) 222 of the rear housing 2.

FIGS. 6 to 8 show examples of the front housing. FIG. 6 shows the front housing 1 corresponding to the connector plug 9 of the engagement projection coupling type shown in FIG. 6C is a left side view of FIG. 6A, and FIG. 6D is a right side view of FIG. 6A. 7 and 8 show FIG.
2 shows a front housing 1 'corresponding to the connector plug 9 having the push-pull connection structure shown in FIG. 8C is a left side view of FIG. 8A, and FIG. 8D is a right side view of FIG. 8A.

The front housing 1 shown in FIGS.
(Or 1 ′) has a through hole 11, so that the optical fiber positioning and fixing portion 31 (see FIG. 2) of the ferrule 3 protrudes from at least the tip of the through hole 11. It has a hole 12 with a large inner diameter. Also, the front housing 1 (or 1 ')
Is formed following the hole portion 12 and the ferrule 3 is formed.
And a flange holding portion (holding hole) 13 having a ferrule pop-out prevention structure for restricting a part of the flange portion 32 to prevent the ferrule 3 from moving forward, and an inner diameter (inscribed inner diameter) larger than the outer diameter Do of the coil spring 4. (Circle) D1i (FIG. 6)
(D) a rear through-hole portion 14 having an engagement portion, and an engagement portion (hole) 15 which is an engagement means for coupling to the rear housing 2.

In this case, the structure for preventing the ferrule from popping out, as shown by reference numeral 13a in FIG. 6A, forms a step between the hole 12 and the hole 13 for restricting the forward movement of the flange portion 32 of the ferrule 3. This is achieved by providing it at the boundary.

FIGS. 9A to 9I show the structure of the rear housing 2. FIG. 9D is an enlarged view of a portion A in FIG. 9A, FIG. 9E is an enlarged view of a portion B in FIG.
9F is an enlarged view of a portion C in FIG. 9A, and FIG.
9A is a sectional view taken along line DD, FIG. 9H is a sectional view taken along line EE in FIG. 9A, and FIG. 9I is a sectional view taken along line FF in FIG. 9A.

As shown in FIGS. 9A to 9I, the rear housing 2 is provided with a locking projection 21 serving as a locking means for connecting with the locking hole 15 of the front housing 1 and a through hole 2.
And 2.

The outer diameter D of the optical cord is provided at the rear end of the through hole 22.
An optical cord insertion hole 223 having an inner diameter D223i larger than c (FIG. 18) is formed, and the optical cord 80 fixed to the optical cord fixing member 5 at the time of assembling the optical connector plug.
The rear end is inserted. An optical code fixing member holding portion 222 having a hole shape larger than the optical code insertion hole 223 is formed in front of the optical code insertion hole 223. When assembling the optical connector plug, the optical cord fixing member 5 having the optical cord 80 fixed to the optical cord fixing member holding portion 222
Is held and fixed.

When the optical cord 80 is pulled backward in a state where the optical connector plug is assembled, the force applied to the cord 80 is applied to the optical cord fixing member holding portion 222 via the optical cord fixing member 5. The rear housing 2 will be pulled further through the portion. Accordingly, in a state where the optical connector plug 9 is assembled, that is, in a state where the rear housing 2 is coupled to the front housing 1 by the locking portion 21, the force when the cord 80 is pulled is limited to the front housing 1 of the optical connector plug 9. And the rear housing 2, and does not cover the coil spring 4, the optical fiber 85, and the ferrule 3 held inside the housing.

A coil spring holding portion 221 is formed at the tip end of the through hole 22 to hold the coil spring 4 during assembly and to compress the rear end 42 of the coil spring 4 forward with the optical connector plug 9 assembled. And energize.
Further, between the coil spring holding portion 221 and the optical cord fixing member holding portion 222, a through hole having an inner surface shape larger than the cross-sectional shape perpendicular to the axis of the outer shape of the optical cord fixing member 5 is provided. An optical cord fixing member introduction hole 224 having a hole diameter larger than the target outer diameter is formed. With this structure, it becomes possible to guide the optical cord fixing member 5 from the distal end side to the optical cord fixing member holding portion 222 of the rear housing 2 and insert it.

Next, as shown in FIG. 1, the optical connector plug 9 of the present invention has a structure in which the through space 6 is formed inside the front housing 1 and the rear housing 2 in a state where they are connected to each other. In a state where these are assembled, the ferrule 3 and the coil spring 4 are held in a state where the flange portion 32 of the ferrule 3 is urged forward by the distal end portion 41 of the coil spring 4 in the through space portion 6, and the coil spring 4 is further Coil spring holding part 2 of housing 2
When the coil spring 4 abuts against the coil spring abutting portion 23, the coil spring 4 is compressed and urged forward.

According to this structure, the front housing 1 is moved from the front of the ferrule 3 and the coil spring 4 and the rear housing 2 are moved from the rear, thereby urging the ferrule 3 forward with a predetermined force. The ferrule 3 can be held inside the combined front housing 1 and rear housing 2. At the same time, the rear housing 2
The optical cord fixing member 5 is attached to the optical cord fixing member
Is held, and the optical cord fixing member 5 is locked by the optical cord fixing member locking portion 24.

(Description of Invention Corresponding to Claim 2)
5, a structure 51 for fixing the cord outer cover 84 and the tensile member 82 of the optical cord 80 to the optical cord fixing member 5 will be described.
Is specifically described.

FIG. 5B is a left side view of FIG.
5C shows the caulking seat 52, FIG. 5D shows the caulking ring 53, and FIG. 5E shows the caulking ring 53.
FIG.

The optical cord fixing member 5 is composed of two members, a caulking seat 52 and a caulking ring 53. The caulking seat 52 has a through hole 521 having an inner diameter (inscribed circle) D5i whose cross-sectional shape is larger than the outer diameter Df (FIG. 18) of the optical fiber core 85, and a tensile member fixing portion 522 is formed outside. .

The caulking ring 53 is a member in which a through hole 531 having an inner diameter (inscribed circle) D51i larger than the outer diameter D52o of the strength member fixing portion 522 of the caulking seat 52 is formed. 532 and a cord outer skin fixing portion 533 are formed.

At the time of assembling, as shown in FIG. 5A, the optical fiber core 85 is passed through the through hole 521 of the caulking seat 52, and the caulking seat 52 is brought to the end 841 of the cord outer cover 84. The tension member 82 is fitted to the tension member fixing portion 522 on the outer surface of the cable, and the caulking ring 53 is covered so as to cover the caulking seat 52 along the tension member 82 and the cord outer end 842. Thereafter, the tensile strength member fixing portion 532 of the caulking ring 53 and the cord outer skin fixing portion 5
By caulking, the tension member 82 and the cord outer cover 84 are fixed to the caulking seat 52 and the caulking ring 53.
Is fixed to the optical cord fixing member 5 composed of

(Description of the Invention Corresponding to Claim 3) The structure 51 for fixing the cord cover 84 and the tensile strength member 82 of the optical cord 80, that is, the optical cord fixing member 5 is a member composed of one or a plurality of members. Any member may be used as long as it has a structure for fixing the cord outer cover 84 and / or the tensile member 82 according to the structure of the optical cord to be used. Further, the dimensions are such that at least after the optical cord 80 is assembled and fixed, the circumscribed circle has a diameter smaller than the inner diameter of the coil spring 4 and has an inscribed circle larger than the outer diameter of the optical fiber core 85. Anything should do. That is, as described above, when the optical cord 80 is fixed by caulking, the dimension before caulking does not necessarily have to satisfy the above condition, but it suffices to satisfy the above condition after caulking.

The optical cord fixing member 5 may be a member having an engaging portion 511 for engaging the inner surface of the rear housing 2 at least on a part of the outer peripheral surface.

FIG. 10 shows the optical cord fixing member 5.
Structure 5 for fixing cord sheath 84 and tensile member 82
1 shows another example.

In FIG. 10A, a fixing portion 5 for bonding and fixing a tensile member 82 to the outer peripheral portion of the optical cord fixing member 5 is shown.
5 is formed. FIG. 10B shows a structure in which the tensile member 82 is fixed to the optical cord fixing member 5 with the adhesive 56. FIG. 10C shows a structure in which the inner surface is fixed to the optical cord fixing member 5 by a heat-shrinkable tube 57 coated with a heat-soluble adhesive.

Also in these fixing structures 51, at least when the optical cord 80 is incorporated and fixed, the dimensions are such that they have a circumscribed circle having a diameter smaller than the inner diameter of the coil spring 4 and the outer diameter of the optical fiber core 85. What is necessary is just to have an inscribed circle of a diameter larger than a diameter.

(Explanation of Inventions of Claims 4 and 12) Even if the rear optical cord 80 is twisted in a state where the optical connector plug 9 is assembled, the optical fiber core 85 in the optical connector plug 9 is not twisted. Is desirable. Therefore, it is desirable that the optical cord fixing member 5 to which the optical cord 80 is fixed does not rotate in the optical connector plug 9 due to such a force.

Then, as shown in FIGS. 5B and 5E,
The outer shape of the optical cord fixing member 5 is a polygonal shape in which corners are chamfered in a circular shape, in other words, a polygonal shape in which an outer cross section of a part (for example, a rear end) has a chamfered circular shape in a corner. I have.

Further, as shown in FIGS. 9F and 9I, the optical cord fixing member holding portion 222 of the rear housing 2 is provided.
Is partially shaped so that the polygonal optical code fixing member 5 can be fitted and its rotation can be prevented. That is, as shown in FIGS. 9F and 9I, the inner diameter cross-sectional shape of the optical cord fixing member holding portion 222 is substantially the same as the circumscribed circle of the optical cord fixing member 5 having a polygonal shape with chamfered corners. It has a substantially circular shape and a shape in which a substantially bow-shaped portion 2221 having a substantially flat wall surface 2222 is added to two sides.

That is, at least a part of the portion corresponding to the portion for accommodating the optical cord fixing member 5 when assembled and which is a part of the inner diameter cross-sectional shape of the optical cord fixing member holding portion 222 of the rear housing 2 is formed with a corner. The optical cord fixing member 5 is formed into a substantially circular shape having substantially the same size as a circumscribed circle of the polygonal optical cord fixing member 5 which is chamfered in a circular shape, and more specifically, has a sectional shape having a flat surface 2222 in which at least a part of the circle is cut out.

With this structure, when the optical cord fixing member 5 is assembled into the rear housing 2, the flat portion of the polygonal optical cord fixing member 5 comes into contact with the flat portion 2222 of the optical cord fixing member holding portion 222. Become. Therefore, the optical cord fixing member 5 to which the optical cord 80 is fixed
The optical cord fixing member holding part 222 of the rear housing 2
When assembled, the optical cord fixing member 5 is held so as to rotate only at a very small angle with respect to the rear housing 2, or only at an angle within a predetermined angle with respect to the rear housing 2. It is held so that it does not rotate.
Therefore, the rotation is prevented, and the optical fiber core 85 is not twisted in the optical connector plug 9.

(Explanation of Claims 5 and 13) As described above,
When the optical cord fixing member 5 is provided with a rotation preventing means for holding the optical cord fixing member 5 at a predetermined rotation angle position with respect to the optical cord fixing member holding portion 222 of the rear housing 2, the optical cord fixing member 5 is inserted through the rear housing 2. When moving the inside of the hole 22 from the front and guiding the optical cord fixing member 5 to the optical cord fixing member holding portion 222, the two are relatively moved so that the optical cord fixing member 5 can be inserted into the optical cord fixing member holding portion 222 in the rear housing 2. It is necessary to be arranged at a predetermined angle.

That is, the optical cord fixing member 5 having a polygonal outer shape by chamfering a corner into a circular shape corresponds to the optical cord fixing member holding portion 222 having a hole shape in which two sides are cut straight. It is necessary to position and insert the rotation angle so that it can be inserted only by moving in the axial direction.

Therefore, only by inserting and moving the optical cord fixing member 5 to the position of the optical cord fixing member holding portion 222,
9 (a) and 9 (e) so that the positioning can be performed automatically.
As shown in (h) and the like, a pair of tapered surfaces for restricting the rotation of the optical cord fixing member 5 are provided in the optical cord fixing member introduction hole 224 communicating with the optical cord fixing member holding part 222 of the rear housing 2. A rotation restricting portion 224a is formed. The restricting portion 224a is configured such that its height and restricting area continuously increase as it goes rearward and connect to the above-described substantially flat wall surface 2222 formed on the inner surface of the optical cord fixing member holding hole 222. I have. The inner diameter of the optical cord fixing member introduction hole 224 is
It is almost the same size as the circumscribed circle.

In other words, just by moving the optical cord fixing member 5 to the optical cord fixing member holding part 222, a predetermined angle is automatically set as shown in FIGS. 9 (a) and 9 (e). , Optical cord fixing member holding portion 22 of rear housing 2
An optical cord fixing member introduction hole 224 is formed in a through hole which is opposite to the optical code insertion hole 223, and the inner surface of the through hole is substantially circular and, in detail, at least a part of the circle. Section shape 22 having a plane cut out
The shape 22 continuing from the circumscribed circle of the optical cord fixing member 5 from 41
42 are continuously connected.

With this configuration, the optical cord fixing member 5
The optical cord fixing member 5 can be guided to a predetermined rotation angle position for preventing rotation only by the operation of sliding the rear housing 2 and the rear housing 2 toward each other.

(Explanation of Claim 6) FIG. 9 (a)
As shown in (d) and the like, the contact (interference) of a part of the inner surface of the optical cord fixing member holding part 222 of the rear housing 2 with the locking part 511 of the outer shape (polygonal shape) of the optical cord fixing member 5 causes Convex portion 241 that undergoes plastic deformation or elastic deformation
Are formed, and when the optical cord fixing member 5 is accommodated in the optical cord fixing member holding portion 222, the convex portion 241 is pressed by the locking portion 511 on the outer surface of the optical cord fixing member 5 and deformed. With this structure, the optical cord fixing member 5 is particularly prevented from moving forward. In the case where the above-described rotation preventing structure is not provided in the optical cord fixing member holding portion 222, by forming the convex portion 241 into an appropriate shape,
It is also possible to prevent the rotation of the optical cord fixing member 5 described above.

(Explanation of Claim 7) As shown in FIG. 9A, the inner surface of the coil spring holding portion 221 of the rear housing 2 has a diameter D221i substantially equal to the outer diameter of the coil spring 4.
It is a circular shape having By forming one or more convex portions (not shown) having the same function as the above-described convex portion 241 on a part of the coil spring holding portion 221, the coil spring 4 is easily fixed to the rear housing 2. be able to. According to this configuration, as shown in FIG. 11A, when the coil spring 4 is inserted into the coil spring holding portion 221 of the rear housing 2, the coil spring 4 is fixed by the convex portion and integrated. By doing so, the coil spring 4 which is difficult to handle does not need to be handled as an individual component, and the assembling property is improved.

(Explanation of Claim 8) As shown in FIG. 11 (b), a rear housing 2 'is composed of a rear housing main body 2 and a boot 25 connected to a rear portion of the main body 2, and a rear housing 2' is formed. By combining the main body 2 and the boot 25 in advance and forming an integrated structure, assemblability can be improved as compared with the case where these are formed as individual components. Further, as shown in FIG.
By assembling the and the boot 25 in the rear housing body 2 in advance, it is possible to further improve the handling of parts during assembly.

The boot 25 is normally used to prevent the optical fiber from being bent extremely and causing loss or breakage even when the cord of the optical connector plug is bent, that is, to provide strength against bending. Is made of a material that is relatively easy to bend.

(Explanation of Claim 9) The front housings 1 and 1 'can have various structures depending on the mating structure such as an adapter for connecting a plug. For example, FIG.
As shown in FIGS. 7 and 8, the features of the present invention are not impaired at all even if the connection structure corresponds to a connector having a so-called push-pull connection structure. In this case, as shown in FIG. 7, the front housing 1 'is composed of the front housing main body 1 shown in FIG.
And a knob 16 that covers the first member.

Further, in order to increase the efficiency of the assembly, the knob 16 is previously connected to the front housing body 1, so that these two parts are slidably integrated in advance. By doing so, the assemblability is improved.
Note that, as is generally done at present, the front housing main body 1 and the knob 16 are not assembled in advance but are provided as separate parts, and after all other assembling steps are completed, the knob 16 is attached to the front housing main body 1. May be worn.

(Description of Manufacturing Process) A method of manufacturing a connector plug according to the present invention will be described with reference to FIGS. The optical connector plug 9 of the present invention has a structure optimal for the manufacturing process described below, and the manufacturing process of the present invention can be suitably realized by using the structure of the optical connector plug 9 of the present invention.

(Explanation of Claims 15 to 17) In the manufacturing process of the present invention, a process for manually processing the optical cord 80, a process relating to fixing the optical cord 80, and a process for fixing the optical fiber core 85 are performed. The order of the step of fixing the ferrule 3 and the step of polishing the ferrule in some cases may be changed, but a step suitable for automation such as a step of integrating the other parts into a series of steps, It is arranged before and after the above-mentioned combined process. Further, when the optical connector plug 9 of the present invention is used, it is possible to assemble basically on the basis of moving each component in the axial direction.

The manufacturing steps in the preferred embodiment of the present invention will be described below with reference to FIGS. 12 (a) to 12 (c) and FIG.
Details will be described with reference to (a) to FIG. 13 (c), FIG. 14, and FIG. 15 (a) to FIG. 15 (c).

(1) Step 1 Incorporation of Components into Optical Cord As shown in FIG. 12A, the boot 25, the rear housing 2, and the coil spring 4 are passed through the optical cord 80 from the end 841 of the cord.

(2) Step 2 Terminal treatment of the optical cord Next, as shown in FIG.
5 and the tensile member 82 are exposed. Also, the tensile member 8
2 is cut to a predetermined length. Note that the cutting of the tensile strength member 82 may be performed before step 5 described later, and may be performed in step 3 or step 4.

(3) Step 3 Fixing the Cord Outer Cover 84 and the Tensile Member 82 to the Optical Cord Fixing Member As shown in FIG. 12C, the tensile member 82 and the cord outer cover 84 are held at predetermined positions in the manner described above. It is fixed to the optical cord fixing member 5.

(4) Step 4 Fixing Ferrule to Optical Fiber and Terminating Further, as shown in FIGS. 13 (a) and 13 (b), the relative distance from the optical cord fixing member 5 is a predetermined distance. The optical fiber 81 is exposed so as to be L, and the ferrule 3 is fixed to the optical fiber 81 at the tip of the optical fiber core 85.

That is, the front housing 1 and the rear housing 2 are connected to each other, and the flange 32 of the ferrule 3 is urged forward by the coil spring 4 into the through space 6 formed therein. The coil spring 4 is held, and the coil spring 4 is urged forward by the coil spring abutting portion 23 of the coil spring holding portion 221 of the rear housing 2 to hold the optical cord fixing member 5 on the optical cord fixing member holding portion 222 of the rear housing 2. Ferrule 3 and optical cord fixing member 5 corresponding to the set state
The ferrule 3 is fixed to the optical fiber 81 such that the ferrule 3 is separated from the optical cord fixing member 5 by a relative distance L.

After assembling in this manner, the end of the ferrule 3 is subjected to a terminal treatment such as polishing of a predetermined end face according to desired characteristics.

As a result, as shown in FIG.
The cord pre-assembly component 7 includes the optical cord fixing member 5 to which the optical cord 80 and the tensile member 82 are fixed, and the ferrule 3 to which the optical fiber 81 is positioned and fixed.

(5) Step 5 Final Assembly After that, the code pre-assembly part 7 shown in FIG.
Next, as shown in FIG. 15 (a), the front housing 1 'is moved from the front in the optical axis direction, and as shown in FIG. 15 (b), the coil spring 4 and the rear housing 2 "are moved from the rear in the optical axis direction. And the code pre-assembly part 7
With the built-in, the engaging portions 15 of the front housing 1 ′ and the engaging portions 21 of the rear housing 2 ″ are engaged with each other to lock the respective housings, thereby completing the optical connector plug 9.

FIG. 20 shows a summary of the manufacturing steps described above.

FIG. 20 (a) Tensile member 8 of optical cord
2 and treatment of cord sheath 84 FIG. 20 (b) Tensile member 82 and cord sheath 84
(C) Adhesive fixing and polishing of the ferrule 3 (FIG. 20 (d)) Locking of the front housing 1 and the rear housing 2 (FIG. 20 (e)) Description) By the way, if the relative distance between the ferrule 3 and the optical cord fixing member 5 cannot be kept at the predetermined value L set in the above-mentioned step 4 in the manufacturing process, the assembled optical connector plug is good. Characteristics cannot be realized.

That is, when the distance is shorter than the predetermined distance L, the optical cord fixing member 5 is located on the distal end side from the predetermined position of the optical cord fixing member holding portion 222 in the optical connector plug 9. For this reason, play occurs in which the optical cord fixing member 5 can move backward in the optical cord fixing member holding portion 222. Therefore, when the optical cord 80 is pulled from behind, the optical cord fixing member 5 moves backward. As a result, the ferrule 3 fixed to the distal end of the optical fiber core 85 is also pulled backward at the same time, and the connection may be disconnected, which may cause deterioration of characteristics.

When the relative distance is longer than the predetermined value L, the optical fiber core 85 is largely bent in the assembled optical connector plug 9 and the bending loss of the optical fiber 81 is increased, and in some cases, the optical fiber is increased. 81 may be broken.

Therefore, in the present embodiment, the ferrule 3
And an assembly tool for fixing the optical cord fixing member 5.

This assembling tool is used for assembling the optical connector plug 9 and has a means for holding the ferrule 3 and a cord outer cover 84 and / or a tensile strength member 82 of the optical cord 80 fixed in advance. A means for holding the optical cord fixing member 5 and an optical cord fixing member 5 to which the optical cord 80 is fixed when the optical fiber 81 at the tip of the optical cord 80 fixed to the optical cord fixing member 5 is fixed to the ferrule 3. And an arranging means for arranging them so as to be in a predetermined positional relationship with each other.

The arranging means is arranged such that the flange 32 of the ferrule 3 is urged forward by the coil spring 4 into the through space 6 formed inside the front housing 1 and the rear housing 2 in a state where they are connected to each other. The ferrule 3 and the coil spring 4 are held, and the coil spring 4 is urged forward by the coil spring abutting portion 23 of the coil spring holding portion 221 of the rear housing 2 to be fixed to the optical cord fixing member holding portion 222 of the rear housing 2. The ferrule 3 is fixed to the optical fiber 81 such that the ferrule 3 is separated from the optical cord fixing member 5 by a relative distance L between the ferrule 3 and the optical cord fixing member 5 corresponding to the state in which the ferrule 3 is held.

FIG. 21 shows an example of such an assembling tool.

This assembling tool makes it possible to easily fix the ferrule 3 at a position of a relative distance L to the optical cord fixing member 5 previously fixed to the optical cord 80.

The assembling tool includes an optical cord fixing member holding jig 210 for holding the optical cord fixing member 5 to which the tensile member 82 and the cord outer sheath 84 of the optical cord 80 are fixed, and a ferrule holding jig 220 for holding the ferrule 3. And a positioning table 20 for positioning the optical cord fixing member holding jig 210 and the ferrule holding jig 220 so that the jigs 210 and 220 are separated from each other by a predetermined distance.
0.

The optical cord fixing member holding jig 210 has a concave portion 211 for accommodating the optical fiber core 85, a concave portion 212 for accommodating the optical cord fixing member 5, and a concave portion 213 for accommodating the optical cord 80. Is formed. These recesses 2
Steps 214 and 215 are formed at the boundaries between the portions 11 and 212 and the boundaries between the concave portions 212 and 213, and the movement of the optical cord fixing member 5 in the front-rear direction is restricted.

The ferrule holding jig 220 is formed with a recess 226 having a step 225 for restricting the rearward movement of the flange 32 of the ferrule 3. The recess 226 accommodates and holds the ferrule 3. You.

The two jigs 210 and 220 are fixed on the positioning table 200. However, when the optical cord fixing member 5 is accommodated and held in the concave portion 212 and the rearward movement of the flange portion 32 of the ferrule 3 is restricted by the step portion 225, the ferrule 3 and the optical cord fixing member 5 Are set such that the distance between the steps 214 and 225 is separated by a relative distance L.

In this assembling tool, first, FIG.
As shown in (a), the cord outer cover 84 and the tensile member 82 of the optical cord 80 are fixed by the optical cord fixing member 5, and the optical cord fixing member 5 is
The optical cord 80 is set on the jigs 210 and 220 so that the optical cord 80 is held and held.

Next, as shown in FIG. 21B, the ferrule 3 is passed through the end of the optical cord 80 where the optical fiber 81 is exposed, and the flange portion 32 of the ferrule 3 is inserted into the step 225 of the jig 220. The optical fiber 81 is positioned so as to be brought into contact with the ferrule 3 and is fixed thereto.

By using such a tool, the ferrule 3 can be fixed to the optical fiber 81 at a predetermined relative distance L from the optical cord fixing member 5.
With such an assembling tool, the step of measuring the relative distance between the ferrule 3 and the optical cord fixing member 5 and the like can be reduced, and the assembling step can be economical.

(Explanation of Claims 18 to 21) In the above-described manufacturing process, the same effect can be obtained even if the order of the steps 3 and 4 is changed. However, in this case, the positional relationship between the ferrule 3 and the optical cord fixing member 5 is defined in a step 4 'in which the optical cord fixing member 5 is assembled. A manufacturing method in the case where the order of Step 3 and Step 4 is exchanged will also be described with reference to FIGS.

(1) Step 1 Step of Incorporating Components into Optical Cord 80 As shown in FIG. 12A, the rear housing 2 and the coil spring 4 are passed through the optical cord 80 from the end 841 of the cord.

(2) Step 2 'Terminal treatment of the optical cord 80 As shown in FIG.
Through the optical cord 8 as shown in FIG.
Then, the cord outer sheath 84 is peeled off by a predetermined length to expose the optical fiber core 85 and the tensile member 82. Further, the optical fiber coating 83 is peeled off to expose the optical fiber 81 at the tip. Further, the tensile member 82 is cut at a predetermined length. The cutting of the tensile member 82 may be performed before the step 5 described later, and may be performed in the step 3 ′ or the step 4 ′.

(3) Step 3 'Fixation of ferrule 3 to optical fiber 81, terminal treatment As shown in FIG. 16C, the ferrule 3 is fixed to the tip of the optical fiber 81. Then, the end of the ferrule 3 is subjected to a terminal treatment such as a predetermined end surface polishing according to a desired characteristic.

(4) Step 4 'Fixing of the cord cover 84 and the tensile member 82 to the optical cord fixing member 5 Further, as shown in FIG. 17, the ferrule 3 and the optical cord fixing member 5 fixed in Step 3' The tensile strength member 82 and the cord outer cover 84 are fixed by the optical cord fixing member 5 so that the relative interval becomes a predetermined interval L set in advance.

That is, the flange 32 of the ferrule 3 is engaged with the ferrule 3 in a state where the flange 32 of the ferrule 3 is urged forward by the coil spring 4 into the through space 6 formed therein in a state where the front housing 1 and the rear housing 2 are connected to each other. The coil spring 4 is held, and the coil spring 4 is fixed to the coil spring holding portion 221 of the rear housing 2.
The ferrule 3 is urged forward by 3 and is separated from the ferrule 3 by a relative distance L between the ferrule 3 and the optical cord fixing member 5 corresponding to a state in which the optical cord fixing member 5 is held by the optical cord fixing member holding portion 222 of the rear housing 2. The optical cord fixing member 5 and the tensile strength member 82
Fixed by.

Thus, as shown in FIG. 13C, the optical cord fixing member 5 to which the cord outer cover 84 and the tensile strength member 82 are fixed, the ferrule 3 to which the optical fiber core 85 is positioned and fixed, The code pre-assembly component 7 having

(5) Step 5 Final Assembly After that, the code pre-assembly part 7 shown in FIG.
Next, as shown in FIG. 15 (a), the front housing 1 'is moved from the front in the optical axis direction, and as shown in FIG. 15 (b), the coil spring 4 and the rear housing 2 "are moved from the rear in the optical axis direction. And the code pre-assembly part 7
With the built-in, the engaging portions 15 of the front housing 1 ′ and the engaging portions 21 of the rear housing 2 ″ are engaged with each other to lock the respective housings, thereby completing the optical connector plug 9.

The terminal treatment such as polishing of the end face of the ferrule may be performed somewhere in the process for forming the code pre-assembly part 7. In addition to the above, the ferrule 3 and the optical cord fixing member 5 May be performed after fixing is performed, or may be performed at an arbitrary stage before step 5.

In any case, in addition to the components described in the above steps, if it is necessary to attach a component that requires post-assembly, for example, a component such as a knob or a cap, the process 5
It goes without saying that such components are mounted in the above.

(Explanation of Claim 23) In step 4 'in the above-described manufacturing process, the relative distance between the ferrule 3 and the optical cord fixing member 5 is set to a predetermined value L.
Otherwise, the optical connector plug assembled as described above cannot achieve good characteristics.

Therefore, in this embodiment, the following assembling tool is used.

This assembling tool is an assembling tool used for assembling an optical connector plug. The assembling tool includes a means for holding the ferrule 3 to which the optical fiber core 85 is fixed in advance, and an optical cord 80 located at the rear end of the ferrule 3. Means for holding the optical cord fixing member 5 passed therethrough, and a ferrule 3 to which an optical fiber 85 is fixed when the cord outer sheath 84 and / or the tensile strength member 82 of the optical cord 80 are fixed to the optical cord fixing member 5. And an arrangement means for arranging the optical cord fixing member 5 and the optical cord fixing member 5 in the predetermined positional relationship.

The arranging means is arranged such that the flange 32 of the ferrule 3 is urged forward by the coil spring 4 into the through space 6 formed inside the front housing 1 and the rear housing 2 in a state where they are connected to each other. The ferrule 3 and the coil spring 4 are held, and the coil spring 4 is urged forward by the coil spring holding portion 221 of the rear housing 2 and the optical cord fixing member 5 to the optical cord fixing member holding portion 222 of the rear housing 2. The tensile strength member 82 and the cord outer cover 84 are fixed by the optical cord fixing member 5 such that the tensile strength member 82 and the cord outer cover 84 are separated from the ferrule 3 by a relative distance L between the ferrule 3 and the optical cord fixing member 5 corresponding to the state in which.

FIG. 22 shows an example of such an assembling tool.

This assembling tool enables the optical cord fixing member 5 to be easily fixed at a position of a relative distance L to the ferrule 3 previously fixed to the optical fiber 81.

In this case, the caulking seat 52 and the caulking ring 53 shown in FIG.

This assembling tool includes a ferrule holding jig 230 for holding the ferrule 3 fixed to the optical fiber 81.
An optical code holding table 240 that holds the optical code 80;
The slide member 270 is provided with a concave portion 271 which is movable on the jig stand 260 via the guide rail 250 and holds the optical fiber core 85. The slide member 270 functions as a member that holds and positions the optical code fixing member 5.

A recess 231 corresponding to the shape of the ferrule 3 is formed in the ferrule holding jig 230, and the movement of the ferrule 3 in the front-rear direction is restricted.

The slide member 270 has an extension 272 extending in the optical axis direction of the optical cord 80, and the tip of the extension 272 is in contact with the optical cord holder 240. When the slide member 270 is moved to the state, the optical cord fixing member 5 in contact with the slide member 270 and the ferrule 3 held by the ferrule holding jig 230 are separated by the predetermined distance L. The dimensions, relative spacing, etc. of each member are set.

In this assembling tool, first, FIG.
As shown in (a), the ferrule 3 to which the optical fiber 81 is fixed is set on a ferrule holding jig 230.

Next, as shown in FIG. 22B, the extending portion 272 of the slide member 270 is
The optical cord fixing member 5 is moved to a position where the optical code fixing member 5 is brought into contact with the slide member 270 in this state. Then, in this state, the optical cord fixing member 5 is caulked and fixed to the optical cord 80.

By using such a tool, the optical cord fixing member 5 can be fixed to the optical cord 80 while being separated from the ferrule 3 by a predetermined relative distance L.

(Explanation of Claim 24) FIGS. 14 and 15
(A) As shown in (b), the front housing 1 is moved to the code pre-assembly component 7 from the front in the optical axis direction, and the coil spring 4 and the rear housing 2 are moved from the rear in the optical axis direction. 7 and the locking portion 15 of the front housing 1 and the rear housing 2
When the coil springs 4 of the rear housing 2 abut against the flanges 32 of the ferrules 3 of the cord pre-assembly parts 7 when assembling the housings with each other being locked by the locking portions 21, the ferrules 3 are pressed by the springs 4 and May move to. Also, the optical cord fixing member 5 may be pushed forward in the rear housing 2 and move.

In particular, when the optical cord fixing member 5 is arranged and fixed on the optical cord fixing member holding portion 222 of the rear housing 2, the locking portion 24 of the optical cord fixing member holding portion 222 and the locking of the optical cord fixing member 5 are performed. In the case where the rear housing 2 is configured to be plastically deformed and fixed while interfering with the rear housing 2,
Is moved toward the optical cord fixing member 5, a relatively large force is applied to the optical cord fixing member 5.

As a result, the relative position between the ferrule 4 and the optical cord fixing member 5 may not be maintained. Alternatively, the optical cord fixing member 5 may not be arranged and locked at a predetermined position of the locking portion 24 of the optical cord fixing member holding portion 222.

In order to avoid this, the rear end of the optical cord 80 is held so that the relative distance L between the ferrule 3 and the optical cord fixing member 5 does not change.

As described above, in the optical connector plug 9, the optical cord fixing member 5 is
The optical cord 80 is locked by the locking portion 24 of the
Therefore, it is necessary to securely hold the optical cord fixing member 5 at the inner rear end of the rear housing 2. Therefore, when the front housing 1 and the rear housing 2 are engaged with each other, the optical cord 8 has a predetermined resistance.
It is necessary to hold 0.

Therefore, the following assembling tool is used.

This tool is used for the cord pre-assembly part 7.
To the front housing 1 from the front in the optical axis direction.
The coil spring 4 and the rear housing 2 are moved from the rear in the optical axis direction, and the housings are locked by the locking portions of the front housing 1 and the rear housing while incorporating the code pre-assembly component 7. When assembling the optical connector plug to be assembled, at least the ferrule 3 is incorporated into the front housing 1 and the flange 32 of the ferrule 3 is disposed on the flange holding portion 13 of the front housing 1. Relative distance L to ferrule 3
, Means for holding the rear end side of the optical cord 80 so that the relative position with respect to the ferrule 3 does not change, and means for holding the rear housing movably in the axial direction with respect to these components. And

FIGS. 23A to 23D show an example of such an assembling tool.

This assembly tool includes a front housing holding member 300 for holding and fixing the front housing 1, a ferrule holding member 310 for holding the ferrule 3, and a rear housing holding member 32 for holding the rear housing 2.
0, and a frictional resistance member 330 that applies a predetermined frictional resistance to the optical cord 80. The rear housing holding member 320 can move along the guide rail 321. This rear housing holding member 320
The movement may be performed manually using the lever 322, or may be performed using an appropriate driving mechanism using a motor or the like.

Before use in this assembling tool, first, the cord pre-assembly component 7 (ferrule 3 and optical cord fixing member 5) is fixed to the tip, and the integrated rear housing 2, coil spring 4, and boot 25 are assembled. The inserted optical cord 80 is assembled.

Then, the ferrule 3 of the optical cord 80 in which such components are incorporated is attached to the ferrule holding member 310.
Place it on the rear housing 2 (in this case, boot 2
5) is held by the rear housing holding member 320, and the optical cord 80 behind the rear housing 2 is set on the frictional resistance member 330. Further, the front housing 1 is set on the front housing holding member 300.

In such a state, the rear housing holding member 320 is moved forward to engage the rear housing 2 and the front housing 1. However, when the rear housing holding member 320 is moved forward, the optical cord 8
0 is given a constant frictional resistance by the frictional resistance member 330.
The front housing 1 and the rear housing 2 are securely set at required positions.

In the above example, the ferrule 3 is held by the ferrule holding member 310.
The optical cord fixing member 5 may be held, or both the ferrule 3 and the optical cord fixing member 5 may be held.

By using such an assembling tool,
Even if the rear housing 2 is moved forward so as to be coupled with the front housing 1, the relative positions of the front housing 1, the ferrule 3, and the rear end of the cord are maintained at a predetermined position.

The optical cord fixing member 5 to which the optical cord 80 is fixed also does not move because the rear end of the cord is held, so that the relative position between the front housing and the ferrule is maintained.

By using such an assembly tool,
The front housing 1 and the rear housing 2 can be fixed while keeping the ferrule 3 and the optical cord fixing member 5 at a predetermined relative position. Thus, for example, the optical cord 8
The optical cord fixing member 5 is prevented from being bent inside the housing to cause breakage of the optical fiber, and the optical cord fixing member 5 is accurately positioned at a predetermined position of the fixing member holding portion 222 inside the rear housing 2 to hold the optical cord. can do.

(Description of Claim 25) FIGS. 14 and 15
(A) As shown in (b), the front housing 1 is moved to the code pre-assembly component 7 from the front in the optical axis direction, and the coil spring 4 and the rear housing 2 are moved from the rear in the optical axis direction. 7 and the locking portion 15 of the front housing 1 and the rear housing 2
When the two housings are locked by the locking portions 21 of the cord pre-assembly component 7, the flange portion 32 of the ferrule 3 is disposed at a predetermined position of the flange holding portion 13 of the front housing 1 and is assembled. After that, the relative position between the ferrule 3 and the front housing 1 must be maintained.

When these are not arranged at predetermined positions,
Alternatively, even if the ferrule 3 is arranged at a predetermined position in the front housing 1, if this arrangement is changed before the coupling between the front housing 1 and the rear housing 2 is completed, the front housing 1 and the rear housing When the two are coupled, the ferrule 3 and the optical cord fixing member 5 are not at a predetermined relative position, and the optical cord 80 may bend inside the housing and break the optical fiber.

In order to avoid this, the front housing 1 is moved from the front with respect to the cord pre-assembly part 7, and after the ferrule 3 of the cord pre-assembly product 7 is assembled in the front housing 1, the ferrule 3
It is necessary to hold the ferrule 3 in the front housing 1 so that the relative distance L between the ferrule 3 and the optical cord fixing member 5 does not change. Thereby, when the rear housing 2 is subsequently installed from behind, the rear housing 1 can be mounted without changing the relative position between the ferrule 3 and the optical cord fixing member 5.
And the front housing 2 can be completed.

At this time, in order to assemble efficiently, an assembling tool for arranging and holding the ferrule 3 at a predetermined position of the front housing is used.

In this tool, the front housing 1 is moved from the front in the optical axis direction, and the coil spring 4 and the rear housing 2 are moved from the rear in the optical axis direction. When the front housing 1 is moved from the front to the cord pre-assembly component 7 when the front housing 1 is moved from the front by the front housing 1 to the cord pre-assembly component 7, the ferrule 3 of the code pre-assembly component 7 is moved to the front housing. 1, a means for holding the ferrule 3, a means for holding the front housing 1,
Means for arranging the flange portion 32 of the ferrule 3 at a predetermined position of the front housing 1, that is, the flange holding portion 13, and this state is maintained so that the relative position between the ferrule 3 and the front housing 1 does not change after the arrangement. Means.

Thus, when the front housing 1 and the rear housing 2 are connected, the ferrule 3 and the optical cord fixing member 5 can be arranged at predetermined relative positions, and the optical cord 80 bends inside the housing and shines. There is no risk of fiber breakage.

FIGS. 24A to 24D show an example of such an assembling tool.

In the assembly tool shown in FIG. 23, the rear housing holding member 320 is moved forward to couple the rear housing 2 to the front housing 1. In the assembly tool shown in FIG. By moving the front housing 1 side backward, the front housing 1
To the rear housing 2.

As shown in FIG. 24, this assembling tool includes a front housing holding member 400 for holding and fixing the front housing 1, a ferrule holding member 410 for holding the ferrule 3, and a rear housing holding member for holding the rear housing 2. 420 and a cord tension member 430 for applying a predetermined backward tension to the optical cord 80 and moving the optical cord 80 backward. The front housing holding member 400 can move in a reciprocating direction along the guide rail 401. In this case, the front housing holding member 400 is manually moved using the lever 402. The rear housing holding member 420 regulates rearward movement of the rear housing 2. In this case, the cord pulling member 430 includes a pair of pulleys and a mechanism for rotating the pulleys.

Before use in this assembling tool, first, the code pre-assembly component 7 (ferrule 3 and optical cord fixing member 5) is fixed to the tip, and the integrated rear housing 2, coil spring 4, and boot 25 are assembled. The inserted optical cord 80 is assembled.

Then, the ferrule 3 of the optical cord 80 incorporating such components is mounted on the ferrule holding member 410.
Place it on the rear housing 2 (in this case, boot 2
5) is held by the rear housing holding member 420, and the optical cord 80 behind the rear housing 2 is set on the tension applying member 430. Further, the front housing 1 is set on the front housing holding member 400.

In this state, the front housing holding member 400 is moved backward,
0 is pulled rearward by the cord pulling member 430 and moved to engage the rear housing 2 and the front housing 1. According to this assembling tool, when the front housing holding member 400 moves backward, the optical cord 8
0, since the ferrule 3 and the optical cord fixing member 5 connected to the optical cord 80 are moved rearward by applying a predetermined tension, the cord pre-assembly part 7 is mounted on the front housing 1 and the rear housing 2. Be sure to set it to the required position.

In the above example, the ferrule 3 is held by the ferrule holding member 410.
The optical cord fixing member 5 may be held, or both the ferrule 3 and the optical cord fixing member 5 may be held.

(Other assembling tools) FIG. 25 shows a plurality of assembling tools shown in FIG. According to such an assembling tool, it is possible to assemble a plurality of connectors at the same time, and the optical connector assembling process is significantly economical.

Incidentally, a plurality of assembling tools shown in FIGS. 21, 22 and 24 may be provided side by side.

(Effects of Embodiment) As described above,
According to the optical connector plug or the method of manufacturing the same according to the above-described embodiment, the order of the manual processing of the optical cord terminal, the fixing of the optical cord, and the fixing of the optical fiber to the ferrule may be changed. Since the steps can be integrated into a series of steps, the automation of assembling the optical connector plug, which has been relatively difficult so far, can be easily realized, and the efficiency of assembling the optical connector plug can be increased.

Further, in assembling the optical connector plug 9, since the operation relating to the assembly can be realized by a simple operation of moving the parts back and forth in the optical axis direction, the assembly can be realized by a relatively simple automatic assembling machine. There is an advantage that automation can be easily performed.

Further, in the prior art,
When the tension member 82 and the tensile strength member 82 are fixed by caulking, a method is generally used in which the tensile strength member and the cord outer cover are attached to the outer peripheral portion of the connector housing, and then the cover member is covered and secured by the caulking member. In this case, the connector housing itself is often formed of metal because the portion of the connector housing to which the tensile member or the cord outer sheath is fixed must withstand the force of caulking.

On the other hand, in the above embodiment, the fixing of the cord outer cover and the tensile strength member is realized by the optical cord fixing member as an individual member independent of the housing body (the front housing and the rear housing). For this reason, in the above-described embodiment, the connector housing is not subjected to caulking force, so that the housing main body, which requires a complicated shape, can be realized by manufacturing such as plastic. Therefore, there is an advantage that the cost of parts can be reduced.

Further, since the optical cord fixing member 5 has an extremely simple structure, it can be realized at low cost. Also,
Since the optical cord fixing member 5 can be inserted through the inside of the coil spring 4, after fixing the optical cord 80 to the optical cord fixing member 5, the coil spring 4 can be moved back and forth in the optical axis direction of the optical cord fixing member 5. Is possible,
The fixing of the optical cord 80 can be performed before the coil spring 4 is arranged at a predetermined position.

As a plug structure for automation or simplification of assembly, there are a structure in which a coil spring is incorporated in a ferrule, and a structure in which these are incorporated in a housing. When fixing the optical fiber to the ferrule, an adhesive is usually used.However, in the optical connector which is simplified as described above, in a state where the coil spring is incorporated in the ferrule or in a state where these are incorporated in the housing,
An optical cord or a tensile member may be fixed to a housing or the like with an adhesive. Therefore, in the case of such a simplified plug, it is necessary to pay close attention so that the adhesive does not stick to parts other than the ferrule or a predetermined member for fixing the tensile strength member. For this reason, in many cases, this is achieved by using a microdispenser for applying an adhesive, a special adhesive injection member, or the like. When adhesive is attached to parts other than ferrules,
This is because various operation failures may occur. On the other hand, the optical connector plug of the above embodiment has a structure in which the ferrule can be fixed away from other components or in a state where no other components are present, so that the ferrule can be easily bonded.

Further, when the optical cord fixing member is composed of a caulking seat and a caulking ring, the caulking seat may be a cylindrical part such as metal, and the caulking ring may be a substantially cylindrical metal part. Can also be realized at low cost.
Further, the tensile strength member and the cord outer cover can be firmly fixed, and a highly reliable optical connector can be provided. Moreover, caulking and fixing of the cord skin and the tensile strength member using these are also possible.
A very simple operation of fixing the tensile strength member and the cord outer skin by placing the tensile strength member on the tensile strength member fixing portion on the outer surface of the caulking seat, covering the tensile strength member with the caulking ring, and then caulking the caulking ring.

Since the rotation preventing structure is provided between the optical cord fixing member and the rear housing, even if the optical cord is twisted, for example, the rotation is prevented, so that the optical fiber in the optical connector plug is prevented. Does not cause twisting or the like due to rotation of the optical fiber, thereby causing disconnection or the like of the optical fiber. Therefore, a highly reliable optical connector plug can be provided.

Further, a guide taper wall surface for guiding the optical cord fixing member to a predetermined rotation angle position to prevent the rotation thereof is provided on the inner wall surface of the rear housing. Only by the operation of moving the optical cord fixing member and the rear housing relatively forward of the optical axis, the optical cord fixing member can be guided to a predetermined rotation angle position for preventing rotation. Since this operation is completed only by relatively moving the optical cord fixing member and the rear housing in the optical axis direction, there is an advantage that workability is good and automation is easy.

Also, one or more convex portions are provided on the inner surface of the optical cord fixing member holding portion of the rear housing, and from the outer surface of the optical cord fixing member when the optical cord fixing member is accommodated in the optical cord fixing member holding portion. Since the optical cord fixing member is fixed to the rear housing by plastic deformation of the convex portion due to the pressing force of the above, the optical cord fixing member and the rear housing are relatively moved only in the optical axis direction to fix the optical cord. The member can be positioned and held in place in the rear housing.

Further, since the inner surface of the coil spring holding portion of the rear housing has a shape substantially equal to the outer shape of the coil spring, and at least a part thereof has a convex portion which is plastically deformed by contact with the coil spring. The coil spring and the rear housing can be handled as one component by inserting the coil spring into the coil spring holding portion of the rear housing in advance and integrating the rear housing and the coil spring. As a result, the number of components in assembly can be reduced and the assembly can be simplified, and a coil spring that is difficult to handle due to its small elasticity and a relatively large and easy to handle rear housing can be integrally handled. In automation, it is desirable to reduce the number of parts, and it is advantageous to be able to handle the coil spring and the rear housing integrally so that automation becomes easy.

Further, even when the cord of the optical connector plug is bent, the boot is relatively easily bent to have strength against bending so that the optical fiber is not bent extremely and loss or breakage does not occur. It is general to be composed of a material. In the present invention, the rear housing is composed of the rear housing main body and the boot coupled to the rear portion of the rear housing main body, and the rear housing main body and the boot are preliminarily integrated so as to be integrally treated with the rear housing. Although the structure does not cause deterioration in characteristics due to bending, there is an advantage that labor for assembling a boot can be omitted and automation can be easily performed.

In a conventional connector or the like, the front housing includes at least a front housing body and a knob that covers the front housing body. The front housing body and the knob are previously slidably integrated with each other. In addition, there is an advantage that the number of parts in the assembly is reduced, the assembly is simplified, and automation is easy.

The present invention is also applicable to SC optical connectors. Further, in the above embodiment, the optical connector plug for a single-core optical fiber is shown, but the present invention is of course applicable to a multi-core optical fiber. Further, the cross section of the ferrule does not necessarily have to be circular, and an arbitrary shape such as a polygonal shape, an elliptical shape, and a rectangular shape can be adopted. Other appropriate cross-sectional shapes of the front housing 1, the rear housing 2, the coil spring 4, the optical cord fixing member 5, and the like may be adopted without departing from the gist of the present invention.

In the above embodiment, the optical fiber positioning / fixing section 31 fixes the optical fiber with an adhesive. However, the optical fiber may be fixed using any other known method. Good.

Further, in the above embodiment, a tensile member,
Although an optical connector plug for connecting an optical cord having an outer sheath, an optical fiber coating, and an optical fiber is shown, the optical connector plug of the present invention is also applied to terminating an optical cord without a tensile member and an outer sheath. You can also.

[0193]

According to the optical connector plug or the method of manufacturing the same of the present invention, the optical code terminal processing step, the optical code fixing step, and the optical fiber The order of the fixing process to the ferrule may be changed, but it can be integrated into a series of processes, so that the automation of the assembly of the optical connector plug, which has been relatively difficult so far, can be easily realized, and the optical connector plug can be easily assembled. The efficiency of assembly can be improved.

Further, in assembling the optical connector plug, since the operation relating to the assembly can be realized by a simple operation of moving the components back and forth in the optical axis direction, the assembly can be realized by a relatively simple automatic assembling machine. There is an advantage that automation can be easily performed.

(Effects of Claims 1, 14, and 26) In the present invention, the fixing of the outer cover of the optical cord and the tensile strength member is realized by individual members independent of the housing body (the front housing and the rear housing). . For this reason, according to the present invention, the housing is not subjected to caulking force, so that the housing main body, which requires a complicated shape, can be realized by manufacturing by molding plastic or the like. Therefore, there is an advantage that the cost of parts can be reduced.

Further, since the optical cord fixing member has an extremely simple structure, it can be realized at low cost. further,
Since the optical cord fixing member can pass through the inside of the coil spring, it is possible to move the coil spring back and forth in the optical axis direction of the optical cord fixing member after fixing the optical cord to the optical cord fixing member. The fixing of the optical cord can be performed before the coil spring is arranged at a predetermined position.

According to the present invention, even when the optical cord is pulled, the external force acts on the rear housing via the optical cord fixing member, and via the front housing connected thereto, the mating side connected to the plug. For example, a housing, an adapter or the like. Therefore, since this force does not act directly on the ferrule, the connection characteristics do not deteriorate due to the displacement of the ferrule.

Further, the optical connector plug of the present invention has a structure in which the ferrule can be fixed to the optical fiber in a state where it is separated from other components or in a state where no other components are present. If so, this operation can be easily performed.

(Effects of Claim 2 or 3) According to the present invention, the caulking seat may be a cylindrical part made of metal or the like, and the caulking ring is also a substantially cylindrical metal part. realizable. Further, the tensile strength member and the cord outer cover can be firmly fixed, and a highly reliable optical connector can be provided. In addition, the crimping of the cord outer cover and the tensile strength member using these components is also performed by fitting the tensile strength member to the tensile strength member fixing portion on the outer surface of the caulking seat, covering the crimping ring, and then crimping the crimping ring. It can be done with a very simple operation of fixing the cord outer skin.

(Effects of Claims 4 and 12) According to the present invention, since the rotation preventing structure is provided between the optical cord fixing member and the rear housing, even when the optical cord is twisted, for example. This prevents the rotation of the optical cord in the optical connector plug, thereby preventing the optical cord from being twisted and breaking the optical fiber, thereby providing a highly reliable optical connector plug.

(Effects of Claims 5 and 13) According to the present invention, the optical cord fixing member is placed on the inner wall surface of the rear housing at a predetermined rotation angle position to be prevented from rotating. A guide taper wall surface for guiding is provided so that the optical cord fixing member and the rear housing are relatively moved only in the direction of approaching in the optical axis direction. Can be guided to the rotation angle position. Since this operation is completed only by moving the optical cord fixing member and the rear housing relatively in the optical axis direction, there is an advantage that workability is good and automation is easy.

(Effect of Claim 6) According to the present invention, the optical cord fixing member is moved to the predetermined position in the rear housing only by moving the optical cord fixing member and the rear housing relatively in the optical axis direction. It can be securely arranged and held.

(Effect of Claim 7) According to the present invention, the coil spring is inserted into the coil spring holding portion of the rear housing and the rear housing and the coil spring are integrated in advance, so that the rear housing and the coil spring are handled because of their small size and elasticity. A difficult coil spring and a relatively large and easy-to-handle rear housing can be handled as one component. As a result, the number of parts in assembly can be reduced and assembly can be simplified, and automation can be facilitated.

(Effect of Claim 8) In the present invention,
Since the rear housing and the front housing are locked by the locking projections and the locking holes, it is possible to easily connect the both.

(Effect of Claim 9) In the present invention,
The rear housing is composed of the rear housing main body and the boots connected to the rear part of the rear housing main body, and the rear housing main body and the boots are pre-integrated so that the rear housing and the boots can be integrally treated. In addition, although the structure does not cause deterioration in characteristics due to bending, there is an advantage that labor for assembling a boot can be omitted and automation can be facilitated.

(Effect of Claim 10) In the present invention, the front housing body and the knob are integrated so as to be slidable in advance, so that the number of parts in assembly and the simplification of assembly can be reduced. And automation becomes easy.

(Effect of Claim 11) In this invention, the optical cord fixing member is inserted through the coil spring in a state where at least the optical cord is incorporated and the tensile strength material and the cord outer cover are fixed to the optical cord fixing member. Since the optical cord is fixed to the optical cord fixing member, it is possible to move the coil spring back and forth in the optical axis direction of the optical cord fixing member, thereby fixing the optical cord.
This can be done before placing the coil spring in place.

(Effects of the Inventions of Claims 22 and 23) According to the assembling tools of these inventions, the ferrule and the optical cord fixing member are connected to the optical cord so that the relative distance is maintained at a predetermined value. Since it can be easily fixed, the step of measuring the distance can be reduced, the efficiency of assembly work can be reduced, the cost can be reduced, and the assembled optical connector plug can have good optical characteristics. Become.

(Effects of Claims 24 and 25) According to the assembling tools of these inventions, the engaging operation between the front housing and the rear housing is performed while applying frictional resistance or tensile force to the optical cord. Therefore, built-in parts such as optical cord fixing members, coil springs, ferrules, etc.
It is possible to securely hold and lock at a required position in the internal space of the front housing and the rear housing, and it is possible to realize efficient assembly work and low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an assembled structure of an optical connector plug according to an embodiment of the present invention, in which an upper portion is cut away.

FIG. 2 is a cross-sectional view showing a structure after assembly of the optical connector plug according to another embodiment of the present invention, in which an upper portion is cut away.

FIG. 3 is a diagram showing an embodiment of the structure of a ferrule.

FIG. 4 is a view showing one embodiment of a structure of a coil spring.

FIG. 5 is a view showing one embodiment of an optical cord fixing member.

FIG. 6 is a view showing one embodiment of a front housing.

FIG. 7 is a view showing another embodiment of the front housing.

8 shows the front housing of FIG. 7 in more detail.

FIG. 9 is a diagram showing one embodiment of a rear housing.

FIG. 10 is a view showing another embodiment of the optical cord fixing member.

FIG. 11 is a cross-sectional view showing a state where a coil spring, a boot and the like are incorporated in a rear housing.

FIG. 12 is a process diagram illustrating a method for manufacturing an optical connector plug according to the present invention.

FIG. 13 is a process diagram illustrating a method for manufacturing an optical connector plug according to the present invention.

FIG. 14 is a process diagram illustrating a method for manufacturing an optical connector plug according to the present invention.

FIG. 15 is a process diagram illustrating a method for manufacturing an optical connector plug according to the present invention.

FIG. 16 is a process diagram illustrating another embodiment of the method for manufacturing an optical connector plug according to the present invention.

FIG. 17 is a diagram illustrating another embodiment of the method for manufacturing an optical connector plug according to the present invention.

FIG. 18 is a view showing a structure of an optical cord connected to the optical connector plug of the present invention.

FIG. 19 is a process chart showing a procedure for manufacturing a conventional optical connector plug.

FIG. 20 is a process chart showing an example of a procedure for manufacturing the optical connector plug according to the present invention.

FIG. 21 is a view showing an example of an assembling tool used when assembling the optical connector plug of the present invention.

FIG. 22 is a diagram showing another example of an assembling tool used when assembling the optical connector plug of the present invention.

FIG. 23 is a view showing another example of an assembling tool used when assembling the optical connector plug of the present invention.

FIG. 24 is a view showing another example of an assembling tool used when assembling the optical connector plug of the present invention.

FIG. 25 is a view showing another example of an assembling tool used when assembling the optical connector plug of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Front housing 2 Rear housing 3 Ferrule 4 Coil spring 5 Optical cord fixing member 6 Penetrating space part 9 Optical connector plug 11 Through hole 12 Hole 13 Flange part holding part 14 Rear through hole part 15 Lock part 16 Knob 21 Lock projection 22 Penetration Hole 23 Coil spring abutment part 24 Optical cord fixing member locking part 25 Boot 31 Optical fiber positioning and fixing part 32 Flange part 41 Front end part 42 Rear end part 51 Structure to be fixed 52 Caulking seat 53 Caulking ring 80 Optical cord 81 Optical fiber 82 Tensile strength Material 83 Optical fiber coating 84 Cord sheath 85 Optical fiber core wire 221 Coil spring holding part 222 Optical cord fixing member holding part (Optical cord fixing member holding hole) 223 Fiber insertion hole 224 Optical cord fixing member introduction hole 241 Convex part 511 Lock Part 521 Through-hole 52 Strength member fixing portion 531 through hole 532 tensile member fixing unit 533 codes outer skin fixing portion

Continuation of the front page (56) References JP-A-3-92803 (JP, A) JP-A-10-319273 (JP, A) JP-A-63-256909 (JP, A) JP-A-11-52186 (JP, A) JP-A-11-52182 (JP, A) Patent 2928101 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 6/36 G02B 6/38

Claims (26)

(57) [Claims] 1. An optical fiber having an optical fiber and an optical fiber coating covering the optical fiber, a cord sheath further covering the optical fiber core, and a cable sheath between the optical fiber core and the cord sheath. An optical connector plug for connecting an optical cord having an interposed tensile member, comprising: a front housing disposed forward in the optical axis direction; and a rear coupled to the front housing and disposed rearward in the optical axis direction of the front housing. A housing, a ferrule, a coil spring, and an optical cord fixing member, wherein the ferrule fixes an optical fiber of the optical cord;
It comprises at least an optical fiber positioning / fixing portion to be positioned, and a flange portion which is urged and held in contact with the coil spring in the front housing, wherein the coil spring is urged in contact with the flange portion of the ferrule on the front surface. And a spring having a predetermined inner diameter and an outer diameter. The optical cord fixing member comprises one or a plurality of members. A member having a fixing structure of the optical cord according to the structure of the optical cord to be used, having an outer diameter that can be inserted into the coil spring after at least the optical cord is incorporated and fixed. A member having a hole having an inner diameter through which the optical cord can be inserted, the member having at least a part of an outer peripheral surface for being locked to an inner surface of a rear housing. Wherein the front housing is a member composed of one or a plurality of members, and is a housing having coupling means for coupling with the rear housing, and a through hole; A hole having an inner surface larger than the outer shape of the optical fiber positioning / fixing portion for projecting the optical fiber positioning / fixing portion of the ferrule at the tip of the ferrule, and a ferrule formed subsequently to this portion and partially interfering with the flange portion of the ferrule The rear housing is a member formed of one or a plurality of members. The housing includes a flange portion holding portion having a protrusion preventing structure, and a rear through hole having an inscribed circle larger than the outer shape of the coil spring. And at least a locking means for coupling with the front housing and a through hole. The locking means is a locking means having a structure in which the front housing and the rear housing are joined by moving the rear housing to the front side, and the rear end side of the through hole is larger than the outer diameter of the optical cord. A fiber insertion hole having a larger diameter and an inner diameter smaller than the inscribed circle of the outer shape of the optical cord fixing member is formed, and the optical cord has a hole shape larger than the fiber insertion hole following the fiber insertion hole in front of the fiber insertion hole. An optical cord fixing member holding portion having an inner shape larger than the fixing member and having fixing means for holding and fixing the optical cord fixing member is formed. A coil spring holding portion for urging the end is formed, and a cut perpendicular to the axis of the outer shape of the optical cord fixing member is provided between the coil spring holding portion and the optical cord fixing member holding portion. A housing forming an optical cord retention member introducing hole which is a through hole of the larger inner surface shape than the shape, the front housing and the rear housing in a state coupled together, a structure formed through space therein,
The front end of the optical fiber positioning and fixing portion of the ferrule, in which the optical fiber of the optical cord is fixed in the through space, protrudes from the front end of the front housing. The ferrule is held in a state in which the flange portion of the ferrule is urged forward at the tip of the coil spring, and the coil spring is urged forward by the coil spring holding portion of the rear housing to fix the optical cord of the rear housing. An optical connector plug having a structure in which an optical code fixing member having an optical code fixed to a member holding portion is formed so as to be fixed and held. 2. An optical cord fixing member, comprising: a caulking seat;
A caulking ring, wherein the caulking seat is a member having a through hole of an inscribed circle larger than the outer diameter of the optical fiber core wire, and a tensile strength member fixing portion is formed on the outside; and the caulking ring is a tensile strength member of the caulking seat. A member having a through-hole having an inscribed circle having a diameter larger than the outer diameter of the fixing portion, wherein a tensile member fixing portion and a cord outer fixing portion are formed inside, and an optical fiber core wire is passed through a caulking seat. After the caulking seat is moved to the end of the exposed cord outer cover, the exposed tensile member is fitted to the tensile member fixing portion of the caulking seat, and the end of the caulking seat along which the tensile member is extended and the end of the cord outer cover are covered. The caulking ring is then covered, and the caulking ring is fixed to the caulking seat and caulking ring by caulking the caulking ring fixing part and the cord skin fixing part. The optical connector plug of claim 1, wherein the a. 3. The optical cord fixing member according to claim 1, wherein a fixing portion for bonding and fixing a tensile strength member is formed on an outer peripheral portion of the optical cord fixing member, and the tensile strength member is fixed to the optical cord fixing member with an adhesive. Optical connector plug. 4. An outer cross section of at least a part of the optical cord fixing member has a polygonal structure in which corners are chamfered in a circular shape, and a part of an inner diameter cross section of the optical cord fixing member holding portion of the rear housing. At least a part of the housing portion of the optical cord fixing member of the rear housing is substantially circular and substantially the same size as a circumscribed circle of the optical cord fixing member having a polygonal shape with a rounded corner. A rotation preventing structure having a cross-sectional shape having a surface obtained by cutting at least a part of the circle and holding the optical cord fixing member so as not to rotate at an angle within a predetermined angle. 4. The optical connector plug according to any one of 1 to 3. 5. A fixing member rotation restriction for restricting rotation of the optical cord fixing member in a through hole communicating with the optical cord fixing member holding portion of the rear housing and opposite to the optical cord insertion hole. Part, the fixing member rotation regulating part,
The rear end side inner surface shape is generally circular and specifically has a cross-sectional shape having a surface obtained by cutting at least a part of the circle, and the front end side inner surface shape is continuous with the circumscribed circle of the optical cord fixing member, 5. The structure according to claim 4, wherein the inner surface of the intermediate portion located between the rear end side and the front end side has a shape in which these two inner surface shapes are continuously connected.
Optical connector plug as described. 6. An outer surface of the optical cord fixing member when a convex portion is provided on an inner surface of a hole of the optical cord fixing member holding portion of the rear housing, and the optical cord fixing member is accommodated in the hole of the optical cord fixing member holding portion. The optical connector plug according to any one of claims 1 to 5, wherein the optical cord fixing member is fixed to the rear housing by interference with the optical connector. 7. The coil spring when the coil spring holding portion of the rear housing has a shape substantially equal to the outer shape of the coil spring and a convex portion is provided on the inner surface of the coil spring holding portion. The coil spring is fixed to the rear housing by interference between an outer surface and the convex portion.
The optical connector plug according to any one of the above. 8. The locking means for the rear housing and the front housing is provided on one of the rear housing and the front housing and is provided on the other end of the rear housing or the front housing, the cantilever having a locking projection at the tip. The optical connector plug according to any one of claims 1 to 7, wherein the optical connector plug has a structure including a locking hole into which a locking projection is inserted. 9. The rear housing has a rear housing main body and a boot coupled to a rear portion of the rear housing main body, wherein the rear housing main body and the boot are integrated in advance. Claim 1 to
9. The optical connector plug according to any one of 8. 10. The front housing comprises a front housing main body and a knob for covering the front housing main body, wherein the front housing main body and the knob are integrated so as to be slidable in advance. The optical connector plug according to claim 1. 11. The optical cord fixing member is a member having a circumscribed circle smaller than the inner diameter of the coil spring after at least incorporating the optical cord and fixing the tensile strength material and the cord outer cover to the optical cord fixing member. Claim 1
11. The optical connector plug according to any one of items 10. 12. An optical cord fixing member having a polygonal cross section at one or a plurality of inner surfaces of a hole of an optical cord fixing member holding portion of the rear housing. 2. The optical connector plug according to claim 1, wherein a substantially flat wall surface for restricting rotation of the optical connector is formed. 13. A rotation restricting portion for restricting rotation of the optical cord fixing member is formed on an inner surface of a portion of the rear housing in the optical cord fixing member introduction hole which communicates with the optical cord fixing member holding portion. Wherein the height and the regulating area continuously increase as going rearward and are connected to a substantially flat wall surface formed on the inner surface of the hole of the optical cord fixing member holding portion. Item 13. The optical connector plug according to item 12. 14. A front housing, a rear housing coupled to the front housing, a ferrule,
A coil spring, comprising an optical cord fixing member, an optical fiber having an optical fiber and an optical fiber coating covering the optical fiber, a cord sheath further covering the optical fiber core, and the optical fiber core. An optical connector plug for connecting an optical cord having a tensile member interposed between the cord and an outer sheath, wherein the ferrule positions and fixes an optical fiber at an end portion of an optical fiber core of the optical cord. And a flange portion that is biased in contact with the coil spring, wherein the coil spring is configured to contact and urge the flange portion of the ferrule and a rear portion that contacts the rear housing. The optical cord fixing member having an end portion and a predetermined inner diameter and an outer diameter; A hole having an outer diameter that can be inserted through a spring, and an inner diameter that can insert the optical cord, and at least a part of the outer peripheral surface having a locking means that is locked to the rear housing; A locking means for locking the rear housing; and a first through hole, wherein the first through hole has an inner diameter larger than an outer diameter of an optical fiber positioning and fixing portion of the ferrule. A hole portion, a middle side hole portion formed following the distal end side hole portion and having a flange portion holding portion that regulates forward movement of the flange portion of the ferrule and accommodates the flange portion; A rear side hole having an inner diameter larger than a diameter, wherein the rear housing is engaged with the front housing by the relative movement of the rear housing and the front housing. A light having an inner diameter through which the optical code can be inserted and the optical code fixing member cannot be inserted through the rear end of the second through-hole; A code insertion hole is formed, and an optical code fixing member holding hole that includes fixing means for fixing the optical code fixing member and accommodates the optical code fixing member is provided in front of the optical code insertion hole. And a coil spring holding portion for holding the coil spring and urging the rear end of the coil spring is formed at the tip end side of the second through hole, and between the coil spring holding portion and the optical cord fixing member holding hole. An optical cord fixing member introduction hole through which the optical cord fixing member can be inserted is formed, and a through space portion is formed inside these housings in a state where the front housing and the rear housing are connected to each other. The front end of the optical fiber positioning and fixing portion of the ferrule to which the optical fiber is fixed protrudes from the front end of the front housing, and the forward movement of the flange portion is restricted by the flange holding portion of the front housing. The ferrule is held in a state where the portion is urged forward by the tip end of the coil spring, the coil spring is urged forward by the coil spring holding portion of the rear housing, and the optical cord is held in the optical code fixing member holding hole of the rear housing. An optical connector plug having a structure in which a ferrule, a coil spring, and an optical cord fixing member are accommodated in the through space so that the optical cord fixing member to which is fixed is fixed. 15. An optical fiber core having an optical fiber and an optical fiber coating covering the optical fiber, a cord sheath further covering the optical fiber core, and a cable sheath between the optical fiber core and the cord sheath. A method of manufacturing an optical connector plug for connecting an optical connector plug to an optical cord having an interposed tensile member, comprising: passing a rear housing and a coil spring through the optical cord;
A second step of exposing the optical fiber core and the tensile member at the end of the optical cord; and fixing the optical cord fixing member to the optical cord by fixing the tensile member and the cord sheath by the optical cord fixing member. In the third step, the ferrule is fixed to the tip of the optical fiber so that the relative distance between the fixed optical cord fixing member and the fixed optical cord fixing member becomes a predetermined interval, and the optical cord fixing member and the ferrule are fixed. A fourth step of forming the code pre-assembly part, and a fifth step of connecting the front housing and the rear housing by moving in the front-rear direction so as to incorporate the code pre-assembly part and the coil spring. Of manufacturing optical connector plugs. 16. The ferrule according to claim 4, wherein the flange portion of the ferrule is urged forward by a coil spring into a through space formed inside when the front housing and the rear housing are joined to each other. The ferrule and the optical cord fixing member corresponding to a state where the coil spring is held and the coil spring is urged forward by the coil spring holding portion of the rear housing and the optical cord fixing member is held in the optical cord fixing member holding hole of the rear housing. 16. The method for manufacturing an optical connector plug according to claim 15, wherein the ferrule is fixed to a tip of the optical fiber so as to be separated from the fixed optical cord fixing member by a relative distance. 17. The method for manufacturing an optical connector plug according to claim 15, wherein in the fourth step, a process including terminal polishing of an end face of the ferrule is performed. 18. An optical fiber core having an optical fiber and an optical fiber coating covering the optical fiber, a cord sheath further covering the optical fiber core, and a cable sheath between the optical fiber core and the cord sheath. A method of manufacturing an optical connector plug for connecting an optical connector plug to an optical cord having an interposed tensile member, comprising: passing a rear housing and a coil spring through the optical cord;
Step, a second step of exposing the optical fiber core and the tensile member at the end of the optical cord, a third step of fixing a ferrule to the tip of the optical fiber core, and a relative distance between the fixed ferrule and The optical cord fixing member is fixed to the optical cord by fixing the tensile strength member and the cord outer cover with the optical cord fixing member so as to have a predetermined interval, and the optical cord fixing member and the ferrule are fixed. A fourth step of forming a pre-assembly component; and a fifth step of connecting the front housing and the rear housing by moving in the front-rear direction so as to incorporate the code pre-assembly component and the coil spring. Manufacturing method of connector plug. 19. The method according to claim 19, wherein the ferrule is formed in a through space formed inside the front housing and the rear housing when the front housing and the rear housing are coupled to each other with the flange of the ferrule urged forward by a coil spring. The relative position between the ferrule and the optical cord fixing member corresponding to a state in which the coil spring is held and the coil spring is urged forward by the coil spring holding portion of the rear housing to hold the optical cord fixing member in the optical cord fixing member holding hole of the rear housing. 19. The method for manufacturing an optical connector plug according to claim 18, wherein the optical cord fixing member is fixed to the optical cord so as to be separated from the fixed ferrule by an interval. 20. The method for manufacturing an optical connector plug according to claim 18, wherein in the third step, a process including terminal polishing of an end face of the ferrule is performed. 21. The method for manufacturing an optical connector plug according to claim 18, wherein in the fourth step, a process including terminal polishing of an end face of the ferrule is performed. 22. An optical fiber having an optical fiber and an optical fiber coating covering the optical fiber, a cord sheath further covering the optical fiber core, and a cable sheath between the optical fiber core and the cord sheath. When fixing a ferrule and an optical cord fixing member for fixing the optical cord to an optical cord having an interposed tensile member, such that the ferrule and the optical cord fixing member are separated by a predetermined interval. An optical connector plug assembling tool, comprising: an optical cord fixing member holding means for holding an optical cord fixing member to which a tensile member of the optical cord and a cord outer sheath are fixed; and an optical cord fixing member holding means. The ferrule is disposed such that the ferrule is separated from the optical cord fixing member by a distance corresponding to the predetermined distance. A ferrule holding means for positioning and holding, wherein an optical fiber of the optical cord is bonded and fixed to the ferrule held by the ferrule holding means. tool. 23. An optical fiber core having an optical fiber and an optical fiber coating covering the optical fiber, a cord sheath further covering the optical fiber core, and a cable sheath between the optical fiber core and the cord sheath. When fixing a ferrule and an optical cord fixing member for fixing the optical cord to an optical cord having an interposed tensile member, such that the ferrule and the optical cord fixing member are separated by a predetermined interval. An optical connector plug assembling tool used for: a ferrule holding means for holding a ferrule to which an optical fiber of the optical cord is adhesively fixed; and the optical cord fixing member for the ferrule held by the ferrule holding means, A light for positioning and holding the optical cord fixing member so as to be separated by a distance corresponding to a predetermined interval. And a cord fixing member holding means, wherein the optical cord fixing member held by the optical cord fixing member holding means is subjected to fixing processing of the tensile strength member of the optical cord and the cord outer skin. Optical connector plug assembly tool. 24. An optical fiber core having an optical fiber and an optical fiber coating covering the optical fiber, a cord sheath further covering the optical fiber core, and a cord sheath between the optical fiber core cord and the cord sheath. An optical connector plug is assembled to an optical cord having an interposed tensile member by using a cord pre-assembly part in which a ferrule and an optical cord fixing member for fixing the optical cord are fixed so as to be separated by a predetermined distance. An assembly tool for an optical connector plug, comprising: front housing holding means for holding a front housing in front of a ferrule of the code pre-assembly component; and assembly holding means for holding a ferrule or an optical cord fixing member of the code pre-assembly component. The optical code of the code pre-assembly part is inserted. A rear housing provided with a coil spring and a rear side of the optical cord fixing member of the code pre-assembly component, and a rear housing holding means movable in the front-rear direction; And a frictional resistance applying means for applying a frictional resistance to the cord. By moving the rear housing holding means forward, the rear housing is mounted on the front housing in a state where the ferrule, the optical cord fixing member and the coil spring are incorporated. An assembly tool for an optical connector plug, wherein a housing is engaged. 25. An optical fiber core having an optical fiber and an optical fiber coating covering the optical fiber, a cord sheath further covering the optical fiber core, and a cable sheath between the optical fiber core and the cord sheath. An optical connector plug is assembled to an optical cord having an interposed tensile member by using a cord pre-assembly part in which a ferrule and an optical cord fixing member for fixing the optical cord are fixed so as to be separated by a predetermined distance. An assembly tool for an optical connector plug, comprising: an assembly holding means for holding a ferrule or an optical cord fixing member of the code pre-assembly component; and a rear housing in which an optical code of the code pre-assembly component is inserted and a coil spring is provided. The pre-assembly part holds the rear of the optical cord A housing holding means; a cord pulling means for pulling the optical cord behind the rear housing holding means; and a front housing which holds the front housing at a front side of a ferrule of the code pre-assembly component and is movable in the front-rear direction. Holding means, wherein the front housing holding means is moved backward and the cord is pulled backward by the cord pulling means, whereby the rear ferrule, the optical cord fixing member and the coil spring are built in. An assembly tool for an optical connector plug, wherein a front housing is engaged with a housing. 26. An optical fiber core having an optical fiber and an optical fiber coating covering the optical fiber, a cord sheath further covering the optical fiber core, and a cable sheath between the optical fiber core and the cord sheath. An optical connector plug connected to an end of an optical cord having an interposed tensile member, a ferrule having a flange portion and fixing an optical fiber exposed at an end of the optical cord, and a rear of the ferrule. An optical cord fixing member for fixing an exposed tensile strength member and a cord outer cover of the optical cord on the side, a coil spring through which the optical cord can be inserted, and a tip of which contacts a flange portion of the ferrule; and a through hole; And a holding portion for holding the ferrule loaded in the through hole inside the housing such that the tip of the ferrule projects from the front opening. A front housing, a through hole, a spring locking portion for locking the rear end of the coil spring loaded in front of the through hole, and an optical cord fixing member inserted from the front to the rear of the through hole. And a rear housing engageable with the front housing. The optical cord fixing member can be inserted through the inside of the coil spring and housed in the rear housing. An optical connector plug having external dimensions, wherein the ferrule, the coil spring, and the optical cord fixing member are accommodated and fixed inside the engagement between the front housing and the rear housing.