KR20100078242A - Field installable optical fiber connector - Google Patents

Abstract

PURPOSE: An optical connector which can be assembled in a field is provided to easily connect and separate optical fibers and to stably and securely connect core wires. CONSTITUTION: An optical connector which can be assembled in a field comprises a clamp, a core wire pressing member(20), a main housing(30), a cable fixture(40), and a boot(50). The clamp is composed of a clamp body(12) and an auxiliary clamp body(14). The core wire pressing member simultaneously presses the outer surface of the clamp and a core wire(7) located inside the clamp. The main housing covers the clamp and the core wire pressing member. The cable fixture has multiple pressing pieces(42). A through hole(51) is formed in the boot.

Description

Field-mountable optical connector {Field installable optical fiber connector}

The present invention relates to an on-site assembly type optical connector, and more particularly, in the field, when connecting the cores of the optical fiber, through the clamps, as well as the connection between the cores by providing a cable fastener to accurately guide the core wires to the clamp and at the same time the cable after connection The present invention relates to a field-assembled optical connector that is firmly fixed so that the connection state of core wires can be made stable and robust, and at the same time, the connection and disconnection of optical fibers and the repeated connection are easily performed.

In general, the field-assembled optical connector used for the connection of optical fiber, which is a transmission medium of optical communication, is widely used in optical links such as various communication devices, precision measuring instruments, audio and video devices, and sensors. Most of these field-assembled optical connectors are terminated and assembled in a manufacturing plant, and recently, due to the expansion of FTTH (Fiber To The Home) service, they can be quickly and quickly installed at the line site when connecting multiple lines. In order to cope easily, a part of the optical connector is processed and assembled in advance so that the optical connector can be connected by simple stripping and cutting of an optical fiber or an optical cable.

Looking at the field assembly optical connector of the prior art as an example, as a key component to protect the optical fiber by preventing the ferrule to make the connection between the optical fibers, and the bending of the optical fiber exposed to the outside of the ferrule. It consists of a frame for wrapping and protecting the outside of the boot and the ferrule.

The prior art field-assembled optical connector connects the core wires of the optical fibers introduced from both sides in the ferrule to each other and hardens the core wire by injecting a curable resin such as epoxy resin into the ferrule so that the connection state thereof is firmly fixed. The hardening resin is injected into the boot to cure the optical fiber disposed in the boot so that the core wires are connected to each other to complete the connection fixing operation of the core wires.

However, such a prior art field assembly type optical connector has a problem in that the use of the optical connector is only one-time and the repetitive use is impossible because the core wire is permanently connected using the curable resin.

In addition, once the connection is made, even if connection loss occurs, such as misalignment between core wires, the connection can not be corrected, there is a problem that the connection performance between the optical fiber is significantly reduced.

In addition, when the core wires are not firmly fixed even after the optical fiber is connected, there is a problem such as a connection loss occurs even in the fine movement of the optical cable.

The present invention has been made to solve such a problem, when the connection of the core of the optical fiber in the field through the clamps as well as the connection between the cores to provide a cable fastener to accurately guide the core wires to the clamp and at the same time firmly fixed to the cable after connection The purpose of the present invention is to provide a field-assembled optical connector that enables the connection and disconnection of optical fibers and the easy connection and repetitive connection at the same time to make the connection state of the core wire stable and robust.

Field assembly type optical connector of the present invention for achieving the above object is provided with a ferrule coupling portion is inserted ferrule is coupled to one end and the core wire placement groove is formed on the other side of the upper side and the cover is disposed on the other end The clamp body is provided with a semi-circular body having a part, and the clamp auxiliary body having a coupling ring which is joined to the clamp body to cover the core arrangement groove, the semi-circular body is formed at its end and wraps around the outer circumferential surface of the clamp body at the center to be coupled to each other. clamp; A core wire pressing member which slides toward the core wire through the handle in a state in which the outer peripheral surface of the clamp is wrapped to pressurize the outer peripheral surface of the clamp and press the core wire inside thereof; A main housing formed by covering the clamp and the core wire pressing member and having a guide unit configured to guide the handle of the core wire pressing member to the outside to slide along the longitudinal direction; One end is coupled to the main housing at the same time the semi-circular tube end of the clamp is inserted into a predetermined length to cover the semi-circular body, and the coupling portion is connected to one end of the coupling portion and the other end is connected to the semi-circular body along the center; A cable fastener having a plurality of pressing pieces communicated with the plurality of pressing pieces divided in the longitudinal direction so as to wrap and narrow the cable; And a boot in which a through hole through which the cable is penetrated and the cable penetrates the other end is formed by covering the pressing pieces of the cable fixing tool.

Further, in the field assembly type optical connector according to the present invention, it is preferable that a core wire guide portion is further provided at a portion of the cable fixing tool that is in contact with the semi-circular tube body.

In addition, in the field assembly type optical connector according to the present invention, it is preferable that the core guide portion is in the shape of a cow (U) tube having an upper end cut out so as to communicate with a gap between the pressing pieces so that it can be observed from the outside.

Further, in the field assembly type optical connector according to the present invention, it is preferable that a stopper is provided to allow the cable to enter the rear end portion of the core wire guide portion.

In addition, in the field assembly type optical connector according to the present invention, it is preferable that a rail groove portion for guiding the cable is further provided on each inner circumferential surface from the tip of the pressing piece to the stopper.

In addition, in the field assembly type optical connector according to the present invention, the rail groove portion is preferably intaglio continuously formed in a curved shape and a right corner shape so as to accommodate circular and rectangular cables at the same time.

Further, in the field assembly type optical connector according to the present invention, a thread is formed on the outer circumferential surface of the cable fixture between the coupling portion and the pressing piece, and a thread is formed on the inner circumferential surface of the boot corresponding thereto to be screwed together. It is preferable that the inner circumferential surface diameter is narrower than the outer circumferential surface diameter of the pressing piece so as to pressurize the pressing piece.

In addition, in the field assembly type optical connector according to the present invention, it is preferable that a square groove portion communicated with the outside is formed on the pressing piece between the screw thread and the core wire guide portion so as to accurately check the state in which the semi-circular tube enters.

In addition, in the field assembly type optical connector according to the present invention, it is preferable that the back surface of the core wire guide portion has an inclined slope structure inclined obliquely so that the fiber of the cable is guided smoothly to the thread.

In addition, in the field assembly type optical connector according to the present invention, it is preferable that a locking protrusion is formed on the outer circumferential surface of the coupling part so as to be firmly fixed to the front end of the guide part when the main housing is coupled with the main housing.

Further, in the field assembly type optical connector according to the present invention, it is preferable that a screw thread is formed on the inner circumferential surface of the pressing piece to pressurize and fix the outer circumferential surface of the cable entering the rail groove portion.

As described above, the field-assembled optical connector of the present invention provides a cable fixing tool as well as a connection between core wires through a clamp when connecting a core wire of an optical fiber in the field to accurately guide the core wire to the clamp and at the same time firmly connect the cable after the connection. By fixing it, the connection state of the core wire is made stable and strong, and at the same time, the connection and disconnection operations of the optical fibers and the repeated connection can be easily performed.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 to 5, when looking at the field-assembled optical connector according to an embodiment of the present invention, the clamp 10 is coupled to the ferrule 5 at one end, and the outer peripheral surface of the clamp 10 A core wire pressing member 20 which slides around the core, the main housing 30 coupled to cover the clamp 10 and the core wire pressing member 20, and a cable fixture coupled to the other end of the main housing 30. 40 and the boot 50 which covers the cable fastener 40 is comprised.

The clamp 10 has a long core line arrangement groove 12a in which the ferrule 5 is coupled to one end and the core line 7 of the ferrule 5 is disposed in the other side thereof. The cover end portion 12b communicating with the core wire placement groove 12a is provided at the other end thereof.

Here, when the clamp 10 is described in more detail, a ferrule coupling portion 12c having a cylindrical shape is provided so that the cylindrical ferrule 5 is inserted into and coupled to one end thereof, and the core wire is formed at a semi-cylindrical cross section at the other side thereof. A clamp main body 12 formed of a semi-circular body 12p having a thin and long v-groove v-shaped core wire placement groove 12a for arranging (7), the end of which has a covering arrangement portion 12b; The semi-circular body 14p is formed in a semi-cylindrical shape which is joined to the clamp main body 12 to cover the core wire placement groove 12a, and at the end thereof corresponds to the semi-circular body 12p and forms a cylindrical body p. And it consists of a clamp auxiliary body 14 having a ring-shaped coupling ring (14a) to be coupled to each other wrapped around the outer peripheral surface of the clamp body 12 in the center.

The semi-cylindrical end surface of the clamp auxiliary body 14 corresponding to the core wire placement groove 12a is flat to press-fix the core wires 7 and f2 disposed in the core wire placement groove 12a by surface contact. It is structured.

The core protrusion member 20 slides on the outer circumferential surface of the clamp 10 on the outer circumferential surface of the clamp auxiliary body 14, which is opposite to the flat surface of the clamp auxiliary body 14, and comes into close contact with the pressing protrusion 14c. Presses toward the core placement groove 12a, and at the same time, the belt shape protrudes gradually gradually inclined along the sliding longitudinal direction of the core wire pressing member 20 so as to be in close contact with the inner circumferential surface of the core wire pressing member 20. The contact protrusion 14d is further formed.

On the other hand, the clamp auxiliary body 14, the core wire (7, f2) in the core arrangement groove (12a) can be visually confirmed by the operator (connection) state through a confirmation window (not shown) of the main housing 30 In order to ensure that it is preferably formed of a transparent material.

And, the cylindrical body p of the clamp 10, that is, each semi-circular body 12p, 14p is compared with the semi-cylindrical shape of the adjacent part so that the spring s elastically supporting the cable fastener 40 is caught. Engaging jaws 12e and 14e are formed at their ends formed of small-diameter portions and bounded by semi-circular columns, respectively.

The core wire pressing member 20 has a short cylindrical shape disposed in a state of wrapping the cylindrical outer circumferential surface of the clamp 10, and both sides of the core wire pressing member 20 are exposed to the outside through the guide portion 32 of the main housing 30 at the rear end of the outer circumferential surface. The handle 21 having a rectangular piece shape protruding into the shape is provided, and the core wire pressing member 20 slides toward the core wire 7 through the handle 21 to press the contact protrusion 14d on the outer circumferential surface of the clamp 10. The pressurizing protrusion 14c of the inner side presses the core wires 7 and f2 in the core wire placing groove 12a.

Here, after the core wire pressing member 20 is slid to press the core wires 7 and f2, the inner circumferential surface of the core wire pressing member 20 is firmly fixed to the clamp 10 while being tightly coupled to the adhesion protrusion 14d. Will be.

The main housing 30 has a rectangular tubular shape in which both sides of the clamp 10 and the core wire pressing member 20 are coupled to each other. The ferrule 8 of the clamp 10 has a predetermined length to the outside. An exposure hole 31 for exposing is formed, and on the other end side thereof, the handle 21 of the core wire pressing member 20 is exposed so as to grasp the handle 21 and guide it toward the core wires 7, f2. The guide part 32 which is cut open is formed.

Here, the main housing 30 has a closed structure in which the front end portion of the guide portion 32 coupled with the cable fixing tool 40 is blocked.

The engaging projection 41b of the engaging portion 41 is caught and fixed to the distal end of the guide portion 32 having the closed structure.

In addition, a pair of hook holes 34 for fastening the hook 42 of the cable fixing tool 40 to the outer circumferential surface of the other end adjacent to the cable fixing tool 40 opposite to the exposure hole 31 are fixed to the upper and lower surfaces thereof. It is formed through each.

In addition, a confirmation window 33 for confirming the inside of the guide part 32 is formed through the outer circumferential surface of the main housing 30 corresponding to the rear end of the guide part 32.

The cable fastener 40 has one end coupled to the main housing 30 and connecting the cable f through the other end thereof, and coupled to the hook hole 34 of the main housing 30 at one end thereof. Coupling protrusion 41a is formed, and the coupling portion 41 covering the semicircular pipes 12p and 14p so that the ends of the semi-circular pipes 12p and 14p of the clamp 10 are inserted into a predetermined length therein. One end portion is connected to the coupling portion 41 and the other end portion is in communication with the semi-circular pipes (12p, 14p) along the central space, the plurality of pressing pieces divided along the longitudinal direction so as to press the narrowing wrapped around the cable (f) It consists of 42.

Here, the pressing pieces 42 have a structure such as dividing into four pieces by dividing the original tube through the center.

In addition, each of the outer peripheral surfaces of the engaging portion 41, the engaging portion (41a) of the engaging projection 41b is formed to be firmly fixed to the front end of the guide portion 32 when engaged with the main housing 30, respectively It is.

In addition, the core wire guide portion 43 is further provided at a portion of the cable fixing tool 40 which is in contact with the tip portions of the semi-circular tubes 12p and 14p.

In more detail, the core wire guide portion 43 is in communication with a gap between the pressing pieces 42 disposed on both sides of the upper half-circle having a u-shaped wall surface having an upper end open for observation from the outside. It is a tubular shape.

In addition, a stopper 44 is provided at the rear end of the core guide 43 to allow the cable f to enter.

Here, the core wire guide portion 43 and the stopper 44 have a structure extending in the axial direction from the respective pressing pieces 42.

In addition, a rail groove portion 45 for guiding the cable f to the stopper 44 is provided on the inner circumferential surface of each of the pressing pieces 42 from the distal end portion of the pressing piece 42 to the stopper 44.

Here, the rail groove portion 45 is intaglio continuously formed in the inner peripheral surface of the pressing piece 42 in the shape of a curved surface and a right angle so as to accommodate the circular and square cable at the same time.

In addition, a screw thread 45a is formed on the inner circumferential surface of the pressing piece 42 to pressurize and fix the outer circumferential surface of the cable f that has entered the rail groove portion 45.

In addition, a thread 46 is formed on the outer circumferential surface of the cable fixing tool 40 between the coupling part 41 and the pressing piece 42 so as to be screwed with the thread 52 of the inner circumferential surface of the boot 50.

In addition, a square groove 42a communicating with the outside is formed on the pressing piece 42 between the screw thread 46 and the core wire guide portion 43 so as to accurately check a state in which the semi-circular tubes 12p and 14p enter. It is.

 In addition, the rear surface of the core guide portion 43 having the yuu (u) type semi-circular tubular shape is inclined at an oblique angle so that the fibers (not shown) of the cable f are guided smoothly to the thread 46. It has a structure (43a).

The boot 50 has a structure in which a through hole 51 through which the pressing piece 42 of the cable fixing tool 40 is covered and pressurized and the cable f penetrates at the other end thereof is formed. Thread 52 is formed to be screwed to the thread 46 of the), the inner peripheral surface diameter of the boot 50 is formed narrower than the outer peripheral surface diameter of the pressing piece 42 can press the pressing piece 42 It is supposed to be. Although not shown, the through hole 51 of the boot 50 may further include a cable cover (not shown) formed of a soft material such as rubber, which may be caused by excessive bending of the cable f. You might be able to reduce the problem.

Looking at the assembly process of the optical connector according to an embodiment of the present invention having such a configuration, first the ferrule 5 is inserted into and fixed to the ferrule coupling portion 12c of the clamp body 12, but the optical fiber of the ferrule (5) The core wire 7 protrudes to the opposite side of the clamp body 12 so as to be disposed in the core wire placement groove 12a on the semi-cylindrical cross section.

Then, the semicircular tube 12p of the clamp main body 12 passes through the coupling ring 14a, thereby joining the clamp auxiliary body 14 with the clamp main body 12, thereby assembling the clamp 10 as one complete body. This is done.

At this time, the semi-cylindrical portions of the clamp main body 12 and the clamp auxiliary body 14 and the semi-circular body parts 12p and 14p are symmetrical with each other to form a double cylindrical shape, and the semi-cylindrical cross section of the clamp auxiliary body 14 The pressure protrusion 14c of the clamp main body 12a is spaced apart from the core arrangement groove 12a of the clamp main body 12 by a predetermined state so that the core wire f2 introduced from the outside can be correctly introduced into the core arrangement groove 12a. do.

After mounting the core wire pressing member 20 to be slidable again on the cylindrical outer circumferential surface of the clamp 10 thus assembled, the ferrule 5 is exposed to the outside through the exposure hole 31 and at the same time the core wire pressing member 20. The cover 21 covers the main housing 30 to the outside of the clamp 10 and the core wire pressing member 20 so that the handle 21 is exposed to the outside through the guide part 32.

Subsequently, after mounting the spring (s) to the outer peripheral surface of the cylindrical body (p) of the clamp 10 exposed to the other end opening of the main housing 30 so that one end thereof is caught by the locking jaw (12e, 14e), Covering the spring (s) with the engaging portion 41 of the cable fastener 40, while engaging the engaging projection (41a) to the hook hole 34 of the main housing 30, while the engaging projection (41b) guide portion (32) Complete the assembly of the cable fastener 40 by hanging on the tip.

At this time, the assembly of the cable fastener 40 is completed and the end of the spring (s) is elastically supported on the inner circumferential surface of the coupling portion 41 of the cable fastener 40, as a result, the cable fixture 40 is the main housing ( And elastically coupled to 30).

In other words, the cable fixing tool 40 is no fluctuations or noises such as a slack in the state coupled with the main housing 30.

When the cable f and the core wire f2 of the tip portion thereof are inserted through the cable fixing tool 40 of the optical connector, in which the coupling is completed, the cable f enters along the rail groove portion 45, and at the same time, the core wire f2 ) Is entered along the core wire guide 43, and is continuously inserted into the core wire placement groove 12a inside the clamp 10 to finally connect with the core wire 7 of the parol 5.

At this time, the front end of the cable f is fastened to the stopper 44 and the entry of the core wire f2 into the clamp 10 is visually confirmed through the gap between the pressing pieces 42, and the core wire 7, The connection between f2) is to be confirmed by the operator with the naked eye accurately through the confirmation window 33 of the frame 30 and the clamp auxiliary body 14 of the transparent material.

As such, when the connection between the core wires 7 and f2 is completed, the handle 21 of the pressing member 20 exposed to the outside of the guide part 32 of the frame 30 is held by hand to the core wires 7 and f2. Slid.

Then, the pressing member 20 slides onto the close contact protrusion 14d of the clamp auxiliary body 14 while being in close contact with the close contact protrusion 14d and at the same time the opposite side thereof is disposed in the core wire placement groove 12a. 7, f2) is pressurized and fixed, and together with the pressurization of the core wires 7 and f2, the pressurizing member 20 itself is firmly adhered to the contact protrusion 14d and the interference fit shape and fixed to each other.

At this time, it is preferable that the other hand of the worker presses the pressing piece 42 of the cable fixing tool 40 to fix the cable f.

Then, when the cable (f) is protruded to the outside to screw the boot 50 to the outer peripheral surface of the cable fastener 40, the screwing of the boot 50 is completed and at the same time the inner peripheral surface of the boot 50 The entire pressing piece 42 of the fastener 40 is naturally pressed. At the same time, the pressing piece 42 is pressed inward, and the cable f disposed therein is firmly pressed.

At this time, the cable f is more firmly fixed by the thread 45a of the inner peripheral surface of the pressing piece 42.

On the other hand, although not shown, the boot 50 is engaged with the fiber (not shown) surrounding the inside of the cable (f) when combined with the thread 46 formed on the outer peripheral surface of the cable fastener (40).

In addition, a well-known technique, such as an overbite prevention jaw (not shown), is formed on the thread 46 to prevent excessive bite when the boot 50 is screwed with the thread 46 formed on the outer circumferential surface of the cable fixture 40. You could do it.

Through the above process, it is possible to firmly secure the connection between the core wire (7, f2) of the optical fiber using the optical connector of the present invention. In addition, such an optical connector is capable of easily disconnecting and re-pressing again by releasing the pressurization of the pressing member 20 from the core wires 7 and f2 connected as necessary.

On the other hand, the entire assembly of the optical connector is completed by covering the external clamp (not shown) to the outside of the frame 30, the coupling of the boot 50 to the cover clamp 40 is protected.

1 is a perspective view showing a field assembly type optical connector according to an embodiment of the present invention.

Figure 2 is an exploded perspective view showing a field assembly optical connector according to an embodiment of the present invention.

Figure 3a is a schematic plan view showing a cable fastener of the field assembly optical connector according to an embodiment of the present invention.

Figure 3b is a schematic bottom view showing the cable fastener of the field assembly optical connector according to an embodiment of the present invention.

4 is a cross-sectional view illustrating a state in which the pressing member is slid to the rear end of the frame in the field assembly type optical connector according to an embodiment of the present invention.

Figure 5 is a cross-sectional view showing a pressing state of the pressing piece of the cable fixture of the field assembly type optical connector according to an embodiment of the present invention by the boot.

** Description of the symbols for the main parts of the drawings **

5: parol 7: core wire

10 clamp 12 clamp body

12a: core placement groove 12b: covering arrangement

12c: parole coupling portion 12e: locking jaw

12p: semicircular body 14: clamp auxiliary body

14a: binding ring 14c: pressure protrusion

14d: contact protrusion 14e: locking jaw

20: pressure member 21: handle

30: frame 31: exposure hole

32: guide part 33: confirmation window

34: Hook Hole 40: Cable Fixture

41: coupling portion 41a: coupling protrusion

41b: locking projection 42: pressure piece

42a: square groove 43a: inclined surface

45a: Thread 43: Core guide

44: stopper 45: rail groove portion

46: thread 50: boot

51: through hole 52: thread

f: cable f2: core wire

p: primitive body s: spring

Claims (11)

A ferrule coupling portion 12c into which the ferrule 5 is inserted and coupled to one end thereof is provided, and a core wire arrangement groove 12a in which the core wire 7 is disposed is formed on the other side of the ferrule 5, and the cover arrangement portion 12b is formed at the other end thereof. The clamp body 12 provided with a semi-circular tube body 12p having an inner side, and the clamp body 12 is joined to the clamp body 12 to cover the core arrangement groove 12a, and a semi-circular body body 14p is formed at an end thereof, and the clamp body 12 is formed at the center thereof. A clamp (10) comprising a clamp auxiliary body (14) having a coupling ring (14a) to wrap around the outer circumferential surface of the 12; The core wire pressing member 20 slides toward the core wire 7 through the handle 21 in a state in which the outer peripheral surface of the clamp 10 is wrapped to pressurize the outer peripheral surface of the clamp 10 and to press the core wire 7 therein. ; The clamp 10 and the core wire pressing member 20 are covered and coupled to each other, but a guide portion 32 is formed on the side to guide the handle 21 of the core wire pressing member 20 to protrude outward and slide in the longitudinal direction. Main housing 30; One end portion is coupled to the main housing 30 and at the same time the ends of the semi-circular tubes 12p and 14p of the clamp 10 are inserted into a predetermined length so as to cover the semi-circular tubes 12p and 14p. One end portion is connected to the coupling portion 41, and the other end thereof is in communication with the semi-circular tubes 12p and 14p along the center, but the plurality of pressures divided along the longitudinal direction so as to press and narrow the cable f. A cable fastener 40 having a piece 42; And A boot 50 formed with a through hole 51 through which the pressing pieces 42 of the cable fixing tool 40 are covered and pressurized and the cable f passes through the other end thereof; Field assembly type optical connector, including a. The method of claim 1, Field assembly type optical connector, characterized in that the core guide portion (43) is further provided at a portion of the cable fixture (40) in contact with the semi-circular tube (12p, 14p). The method of claim 2, The core wire guide portion 43 is in communication with the gap between the pressing pieces 42, the field assembly type optical connector, characterized in that it is in the shape of a yuu (u) tube cut in the upper end to be observed from the outside. The method of claim 3, Field assembly type optical connector, characterized in that the stopper (44) is provided at the rear end of the core wire guide portion (43) to allow the cable (f) to enter. The method of claim 4, wherein Field assembly type optical connector, characterized in that the rail groove portion 45 is further provided for guiding the cable on each inner circumferential surface from the tip of the pressing piece to the stopper 44. The method of claim 5, The rail groove portion 45 is a field assembly type optical connector, characterized in that the engraved in succession in the shape of a curved surface and a right corner so as to accommodate a circular and square cable at the same time. The method of claim 6, The thread 46 is formed on the outer peripheral surface of the cable fastener 40 between the coupling portion 41 and the pressing piece 42 and the thread 52 is formed on the inner peripheral surface of the boot 50 corresponding thereto to be screwed together. Field assembly type optical connector, characterized in that the inner peripheral surface diameter of the boot 50 is formed narrower than the outer peripheral surface diameter of the pressing piece 42 to press the pressing piece (42). The method of claim 7, wherein On the pressing piece 42 between the screw thread 46 and the core wire guide 43, a square groove portion 42a communicated to the outside is formed so as to accurately check the state in which the semi-circular tubes 12p and 14p enter. Field-mounted optical connector. The method of claim 7, wherein The back surface of the core wire guide portion 43 is a field assembly type optical connector, characterized in that the inclined inclined surface (43a) structure to allow the fiber of the cable (f) to be guided smoothly to the thread (46). The method of claim 7, wherein Field assembly type optical connector, characterized in that the engaging projection (41b) is formed on the outer circumferential surface of the coupling portion 41 is coupled to the main housing (30) so as to be firmly fixed to the tip of the guide portion (32). The method of claim 7, wherein Field assembly type optical connector, characterized in that the threaded portion (45a) for pressing and fixing the outer peripheral surface of the cable (f) entered into the rail groove portion 45 on the inner peripheral surface of the pressing piece (42).

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