KR20090064260A - Field installable optical fiber connector - Google Patents

Abstract

A field assembly type optical connector is provided to prevent loss of a signal due to inconsistency of a core wire by firming connection between core wires through a clamp in contacting a core wire of an optical fiber in a field. A field assembly type optical connector includes a clamp, a pressurizing member, a frame, a coating clamp, and a boot. A ferrule(5) is coupled in one end of the clamp. An optical fiber core wire(7) of the ferrule is arranged in a core wire arranging groove(12a). A coating arranging part(12b) is formed in the other end of the clamp, and is interlocked in the core wire arranging groove. The pressurizing member(20) pressurizes an inner core wire by pressurizing an outer circumference of the clamp. The coating clamp(40) is coupled in the other end of the frame, and covers a circular tube body of the clamp. The boot is connected to the coating clamp, and covers an outer circumference of the optical fiber.

Description

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

The present invention relates to a field-assembled optical connector, and more particularly, to secure the connection between the cores through the clamp in the field as well as the inner coating of the optical fiber to ensure a stable and robust connection state of the core wire in the field At the same time, the present invention relates to a field-assembled optical connector that facilitates the connection and disconnection of optical fibers and repeated connection.

In general, the field assembly type 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.

As an example, looking at the field-assembled optical connector of the prior art as described above, the core component is to protect the optical fiber by preventing the ferrol to be connected between the optical fibers and the bending of the optical fiber exposed to the outside of the ferrol. It consists of a frame for wrapping and protecting the outside of the boot and the ferrol.

 The prior art field-assembled optical connector connects the core wires of optical fibers introduced from both sides in the ferrol to each other and injects a curable resin such as an epoxy resin into the ferrol to harden the core wires or to secure the connection thereof. 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 a 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, and when the connection of the core of the optical fiber in the field, the connection between the cores is firmly fixed, thereby preventing the loss of the signal generated when the core mismatch At the same time, it is possible to prevent defects in the connection state of the core wires, and also to fix the inner coating of the optical fiber together with the core wire fixation, so that the fixation state of the optical fiber is more firm and the connection strength between the core wires is further improved. In addition, the optical fiber can be easily separated and connected to each other through the clamp, and can be repeatedly connected several times. Sites to be widely used for To provide a standalone optical connector has that purpose.

Field assembly type optical connector of the present invention for achieving the above object is a core wire arrangement groove is formed in which the optical fiber core wire of the parol is coupled to one end and penetrated inside the other side and the core wire placement groove at the other end A clamp provided with a cylindrical body forming a coating arrangement communicating with the tube; A pressing member sliding toward the core in a state in which the outer circumferential surface of the clamp is wrapped to press the clamp outer circumferential surface to press the inner core wire; The frame is coupled to cover the clamp and the pressure member, the exposure hole is formed so that the parol is exposed to the outside at one end and a guide portion for guiding the pressure member on the side of the other end; A covering clamp coupled to the other end of the frame to cover the tube body of the clamp; And a boot connected to the covering clamp to cover and protect an outer circumferential portion of the optical fiber.

Further, in the field assembly type optical connector according to the present invention, the clamp is provided with a ferrule coupling portion for inserting the ferrule at one end and the core wire groove is formed at the other end of the clamp, the end of which is a semi-circular tube main body; And a clamp auxiliary body which is combined with the clamp body to cover the core arrangement groove and has a semi-circular tube body formed at an end thereof, and has a coupling ring to be coupled to each other by surrounding the outer circumferential surface of the clamp body at the center thereof.

In addition, in the field assembly type optical connector according to the present invention, the boot is covered by the outer peripheral surface of the cladding clamp is coupled, and correspondingly the pressing piece is pressed to the inner peripheral surface side by pressing the boot on the outer peripheral surface of the cladding clamp is provided, this pressing It is preferable that a coating pressing piece is provided on the outer circumferential surface of the clamp in the same line as the piece to press the inner coating while being sequentially pressed by the pressing piece.

In addition, in the field assembly type optical connector according to the present invention, it is preferable that the cross section of the clamp auxiliary body corresponding to the core arrangement groove has a flat planar structure in order to press the core wire in the core arrangement groove.

Further, in the field assembly type optical connector according to the present invention, as the pressing member is in close contact with the outer circumferential surface of the clamp auxiliary body corresponding to the pressure flattening portion of the clamp auxiliary body to be inclined in the longitudinal direction so as to be in close contact with the pressing member. It is preferable that the protruding adhesion protrusions are further formed.

In addition, in the field assembly type optical connector according to the present invention, the clamp auxiliary body is preferably made of a transparent material so that the core wire in the core arrangement groove can be visually confirmed.

In addition, in the field assembly type optical connector according to the present invention, the cylindrical body of the clamp is formed with a small diameter portion, one end is caught to this locking jaw and the other end is arranged to be caught in the locking jaw inside the cover clamp to cover the cover clamp. It is preferable that a spring that is elastically supported is further provided.

In addition, in the field assembly type optical connector according to the present invention, the outer peripheral surface of the pressing member is preferably provided with a handle that is exposed to the outside through the guide portion of the frame.

In addition, in the field assembly type optical connector according to the present invention, the outer peripheral surface of the frame is further provided with a confirmation window so as to visually check the connection state between the core wires and the core wires introduced from the outside through the boot core wires desirable.

In addition, in the field assembly type optical connector according to the present invention, the boot is preferably composed of a first boot of a tubular shape that is coupled to the covering clamp and a second boot of a conical tube shape that is detachably coupled to the first boot. Do.

Further, in the field assembly type optical connector according to the present invention, the inner circumferential surface of the second boot is a thread thread so that the fiber yarn between the inner coating and the outer coating of the optical fiber flowing in from the outside is engaged with each other and entangled together. And it is preferable that the some flat part formed in the longitudinal direction between these screw threads is provided, respectively.

In addition, in the field assembly type optical connector according to the present invention, it is preferable that an outer housing for covering and protecting the frame outside the frame is further provided.

In the field-assembled optical connector of the present invention, the connection between the cores is securely fixed through the clamp when the core wire of the optical fiber is connected in the field, thereby preventing the loss of the signal caused when the wire mismatch occurs. In addition, it is possible to prevent the occurrence of a defect in the connection state of the optical fiber, and also to secure the internal coating of the optical fiber together with the core wire fixation. Fiber optics can be easily separated and connected to each other and can be repeatedly connected several times, so that they can be used for optical fiber distribution boards or optical end stations and optical fiber cables or optical fiber cables, or widely used as input / output terminals such as optical measuring devices. Effect such as to obtain.

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

As shown in FIGS. 1 to 5, the field assembly type optical connector according to the present invention includes a clamp 10 having a parol 5 coupled to one end thereof, and a pressing member sliding around the outer circumferential surface of the clamp 10. 20), the frame 30 coupled to cover the clamp 10 and the pressing member 20, and the coating clamp 40 is coupled to the other end of the frame 30 to press the inner coating 61 And an outer housing 70 connected to the sheath clamp 40 to protect the optical fiber 60 and to cover the outside of the frame 30.

The clamp 10 has a core wire arranging groove in which a ferrule 5 is coupled to one end and a core wire 7 of an optical fiber (not shown) of the ferrule 5 is disposed inside the other side thereof. A cylindrical body p is formed which has a length 12a formed therein and forms a covering arrangement portion 12b communicating with the core wire arrangement groove 12a at the other end thereof.

Herein, the clamp 10 will be described in more detail, and a cylindrical ferrule coupling portion 12c is provided at one end such that the cylindrical ferrule 5 is inserted into and coupled to the semi-cylindrical cross section on 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 and covers the core wire placement groove 12a, and forms a cylindrical body p at the end thereof corresponding to the semi-circular tube body 12p. 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 boot 50 is coupled to the semicircular tubes 12p and 14p of the clamp main body 12 and the clamp auxiliary body 14 when the boot 50 covers the outer circumferential surface of the cover clamp 40. That is, the coating is pressed in sequence by pressing the pressing piece 41 on each outer circumferential surface in the same line as the pressing piece 41 of the coating clamp 40 pressed inward by the pressing of the first boot 52. Elastically with respect to one side which is cut out in the shape of a cylinder and connected in one piece on each semi-circular tube body 12p, 14p so as to pressurize the outer circumferential surface of the inner coating 61 disposed on the mounting portions 12b, 14f. The coated pressing pieces 12d and 14b which are rotated are provided. In the above embodiment, the coated pressing pieces 12d and 14b are illustrated in the form of a cut out in a depressed shape, but may simply be of a protruding form.

In addition, the semi-cylindrical cross section of the clamp auxiliary body 14 corresponding to the core arrangement groove 12a is a flat plane for pressing and fixing the core wires 7 and 62 disposed in the core arrangement groove 12a by surface contact. It has a structure (pressure flat part 14c). The portion indicated by the pressure flattening portion 14c may be convexly protruding to a certain height.

Then, on the outer circumferential surface of the clamp auxiliary body 14, which is the opposite side to the flat surface of the clamp auxiliary body 14, the pressing member 20 slides on the outer circumferential surface of the clamp 10 and comes into close contact with the clamp auxiliary body 14. A band shape protrudes while gradually inclining gradually along the sliding longitudinal direction of the pressing member 20 so as to press the flat surface of the pressing member toward the core wire placement groove 12a and to be in close contact with the inner circumferential surface of the pressing member 20. A close contact portion 14d is formed (see Fig. 2A). 2b shows another embodiment of the close contact portion 14g.

On the other hand, the clamp auxiliary body 14 allows the core wires 7 and 62 in the core arrangement groove 12a to allow the operator to visually check the connection (alignment) state through the confirmation window 33 of the frame 30. It will be preferable to be formed of a transparent material.

In addition, 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 a spring s elastically supporting the sheath clamp 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 pressing member 20 has a short cylindrical shape disposed in a state of wrapping a cylindrical outer circumferential surface of the clamp 10, and a square piece protruding from both sides to be exposed to the guide portion 32 of the frame 30 at the rear end of the outer circumferential surface. A handle 21 having a shape is provided, and the pressing member 20 slides toward the core 7 through the handle 21 to press the contact protrusion 14d on the outer circumferential surface of the clamp 10 to press the pressure flat portion of the inner side thereof. 14c presses the core wires 7 and 62 in the core placement groove 12a.

Here, after the pressing member 20 is slid and pressurized by the core wires 7, 62, the inner circumferential surface thereof is firmly fixed to the clamp 10 while being tightly coupled to the contact protrusion 14d with a press fit shape. Will be.

The frame 30 has a rectangular tubular shape through which both sides of the clamp 10 and the pressing member 20 are coupled to each other and are coupled to each other so that the parole 8 of the clamp 10 is exposed to a predetermined length to one end thereof. Exposed hole 31 is formed, and the other end side is open to the handle 21 of the pressing member 20 to be exposed to cut open to guide the handle 21 toward the core wire (7, 62) The guide part 32 which exists is formed.

In addition, the outer peripheral surface of the frame 30 is connected to the core 7 of the core arrangement groove 12a and the core wire 62 introduced from the outside through the boot 50 to the crimp auxiliary body 14 of transparent material The confirmation window 33 is formed so that it can be visually confirmed through.

In addition, a pair of hook holes 34 to secure the hook 42 of the cover clamp 40 to the outer circumferential surface of the other end adjacent to the cover clamp 40 opposite to the exposure hole 31 are fixed to the top and bottom surfaces thereof. It is formed through each.

The cladding clamp 40 is a cylindrical shape that is coupled to the other open end of the frame 30 and at the same time covers a cylindrical body p of the clamp 10 exposed to the other end. The locking jaw (60a) is formed to elastically support the other end of the spring (s) hanging on the locking jaw (12e, 14e) of the), one end of the outer peripheral surface of the hook hole 34 of the frame 30 A pair of hooks 42 to be caught and fixed are formed to protrude from upper and lower surfaces, respectively.

In addition, a disk-shaped flange portion 43 is provided at the central portion of the cladding clamp 40 so as to be hooked to one edge portion of the frame 30, and the boot 50 is provided at the rear portion adjacent to the flange portion 43. ) When it is engaged, it is pressed toward the inner circumferential surface and cut in a recessed shape so as to sequentially press the coated pressing pieces 12d and 14b of the clamp 10 arranged on the same line inside thereof. A pressing piece 41 is provided.

Here, the pressing piece 41 is provided in pairs corresponding to the cover pressing pieces 12d and 14b of the semicircular pipe bodies 12p and 14p to be pressed.

A thread 44 is formed on the outer circumferential surface of the covering clamp 40 to be screwed to the first boot 52.

The boot 50 prevents the bending of the optical fiber 60 by introducing the core wire 62 into the tube body p of the clamp 10 and then being coupled with the cladding clamp 40 to cover the outer circumference of the optical fiber 60. Etc., to protect the optical fiber 60, the boot 50 is detachably coupled to the first boot 52 and the first boot 52 of the two-stage tubular shape that is coupled to the cover clamp (40). The second boot 54 of the conical tube shape.

Here, the first boot 52 is formed on the outer circumferential surface of the small diameter portion so that the inner circumferential thread 52a and the second boot 54 are formed on the inner circumferential surface of the large diameter portion so as to be screwed to the thread 44 of the covering clamp 40. The outer peripheral thread 52b is formed, respectively. The first boot 52 and the second boot 54 may be coupled to each other by fitting the protrusion and the groove.

In addition, the inner circumferential surface of the first boot 52 is screwed with the outer circumferential surface thread 44 of the covering clamp 40 and between the inner coating 61 and the outer coating 63 of the optical fiber 60 introduced from the outside. Thread 52a is formed so that the bundled fiber yarns 64 are entangled together to secure their fastening, and the outer circumferential surface 44 of the coated clamp 40 is screwed with the thread 52a. ) Is provided with a plurality of flat portions 44b formed in the longitudinal direction.

Here, since the thread 52a and the flat portion 44b are formed in a shape in which the valleys intersect with each other, the bundles of fiber yarns 64 are entangled with each other, particularly in these intersecting portions, so that the fastening between them is firm. You will see.

The outer housing 70 has a rectangular tubular shape for covering the outside of the frame 30 to protect the outside of the frame 30.

Looking at the assembly process of the field-assembled optical connector of the present invention according to this configuration, first, the ferrule 5 is inserted into and fixed to the parole coupling portion 12c of the clamp body 12, but the optical fiber core wire of the parole 5 ( 7) is projected to the opposite side of the clamp body 12 to be placed in the core wire placement groove 12a on the semi-cylindrical cross section. The optical fiber core 7 is fixed in the core arrangement groove 12a by an adhesive such as epoxy.

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 flat surface is separated from the core arrangement groove 12a of the clamp main body 12 by a predetermined distance so as to be in an excited state, and the core wire 62 introduced through the boot 50 from the outside flows accurately into the core arrangement groove 12a. To be possible.

After mounting the pressure member 20 to be slidable again on the cylindrical outer circumferential surface of the clamp 10 after the assembly is completed, the parol 5 is exposed to the outside through the exposure hole 31 and the pressure member 20 The handle 21 covers the frame 30 to the outside of the clamp 10 and the pressing member 20 so as to be exposed to the outside through the guide portion 32.

Subsequently, the spring s is mounted on the outer peripheral surface of the tube body p of the clamp 10 exposed to the other end opening of the frame 30 so that one end thereof is caught by the locking jaws 12e and 14e. While covering the spring s with the clamp 40, the hook 42 is caught by the hook hole 34 of the frame 30 to complete the assembly of the cladding clamp 40.

Here, the assembly of the cladding clamp 40 is completed and at the same time the end of the spring (s) is elastically supported on the engaging jaw (40a) of the cladding clamp 40 as a result of the clasp clamp 40 to the frame 30 Elastically coupled to the

That is, the cover clamp 40 is no fluctuation or noise such as a rattling in the state coupled with the frame 30 is generated.

The outer coating 63 of the optical fiber 60 is peeled off through the open central hole of the tube body p of the clamp 10 exposed to the outside through the cover clamp 40 of the optical connector thus assembled. Only the inner sheath 61 and the core wire 62 of the tip end thereof are inserted except for the fiber yarn (aramid yarn) 64 of the fiber yarn, and the core wire 62 is continuously inserted to the core wire placement groove 12a inside the clamp 10. Finally, the connection with the core 7 of the parrol 5 is made.

At this time, whether the connection between the core wires (7, 62) is to be confirmed by the operator with the naked eye through the confirmation window 33 of the frame 30 and the clamp aid 14 of the transparent material.

As such, when the connection between the core wires 7 and 62 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 62. Slid.

Then, the pressing member 20 is brought into close contact with the contact protrusion 14d while sliding onto the contact protrusion 14d of the clamp auxiliary body 14, and the flat surface on the opposite side thereof is in surface contact with the core wire 7,62. ) Is pressurized and fixed, and the pressing member 20 itself together with the core wires 7 and 62 are also firmly adhered to each other with a close contact portion 14d and an interference fit shape.

Then, the first boot 52 is screwed into the outer circumferential surface of the cladding clamp 40, and the joining of the first boot 52 is completed, and the inner circumferential surface of the first boot 52 is formed of the cladding clamp 40. The pressing piece 41 is naturally pressurized, and at the same time, the pressing pieces 41 are pressed inward to sequentially press the respective coated pressing pieces 12d and 14b of the semicircular tubes 12p and 14p disposed therein. Finally, the coated pressing pieces 12d and 14b press the inner coating 61 of the optical fiber 60 arranged on the innermost covering arrangement portions 12b and 14f so as to press the core wire of the optical fiber 60 ( 62) and the inner coating 61 is firmly pressurized.

Then, the fiber yarn 64 of the optical fiber 60 exposed to the outside of the first boot 52 is screwed back to the first boot 52 in a state in which the second boot 54 covers the fiber yarn 64. The optical fiber 60 can be protected, such as the warpage prevention of 60.

At this time, the fiber yarn 64 is firmly intertwined with the threads 54a and the flat portion 54b inside the second boot 54 while the second boot 54 is screwed onto the first boot 52. To be combined.

Through the above process, it is possible to firmly secure the connection between the core wire (7, 62) 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 62 which are connected as necessary.

On the other hand, the entire assembly of the optical connector is completed by covering and protecting the outer housing 70 to the outside of the frame 30, the coupling of the boot 50 to the cover clamp 40 is completed.

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

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

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

Figure 3 is a cross-sectional view showing a field assembly optical connector according to an embodiment of the present invention.

Figure 4 is a cross-sectional view showing a sliding state of the pressing member of the field assembly optical connector according to an embodiment of the present invention.

5 is a cross-sectional view illustrating a pressing piece of the cover clamp of the field assembly type optical connector according to an embodiment of the present invention pressed by the first 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: Farol coupling part 12d: Cover pressing piece

12e: hanging jaw 12p: semicircular body

14: clamp auxiliary body 14a: coupling ring

14b: coating pressing piece 14d, 14g: adhesion protrusion

14e: Hanging jaw 14f: Covering part

20: pressure member 21: handle

30: frame 31: exposure hole

32: guide part 33: confirmation window

34: hook hole 40: sheath clamp

40a: locking jaw 41: pressing piece

42: hook 43: flange

44: thread 50: boot

52: first boot 52a: inner peripheral thread

52b: outer peripheral thread 54: second boot

54a: thread 54b: flat part

60: fiber 61: inner coating

62: core wire 63: outer coating

64: fiber yarn 70: outer housing

p: primitive body s: spring

Claims (12)

A core wire arranging groove 12a is formed in which one end of the parol 5 is coupled and the optical fiber core 7 of the parol 5 penetrated inside the other side is formed, and the other end communicates with the core wire arranging groove 12a. A clamp 10 provided with a cylindrical body p for forming the covering arrangement portion 12b to be formed; A pressing member 20 which slides toward the core line 7 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 to press the inner core wire 7; Covered and coupled to the clamp 10 and the pressing member 20, an exposed hole 31 is formed at one end so that the parol 5 is exposed to the outside and guides the pressing member 20 to the other end side. A frame 30 in which the guide part 32 is formed; A covering clamp 40 coupled to the other end of the frame 30 to cover the tube body p of the clamp 10; And A boot (50) connected to the sheath clamp (40) to cover and protect the outer circumferential portion of the optical fiber (60); Field assembly type optical connector, including a. The method of claim 1, The clamp 10, Clamp body 12 having a ferrule coupling portion 12c into which one of the ferrules 5 is inserted and coupled to one end thereof, and having the core wire placement groove 12a formed at the other end thereof, and having an end portion thereof as a semi-circular tube body 12p. ; And The coupling ring 14a which is combined with the clamp main body 12 to cover the core wire placement groove 12a and has a semi-circular tube body 14p formed at an end thereof, is wrapped around the outer circumferential surface of the clamp main body 12 at the center thereof and coupled to each other. A clamp aid 14 having; Field assembly type optical connector, characterized in that consisting of. The method of claim 2, The boot 50 is covered with the outer circumferential surface of the cladding clamp 40 and coupled thereto, and correspondingly, a pressing piece 41 is pressed on the outer circumferential surface of the cladding clamp 40 toward the inner circumferential surface side by pressing the boot 50. The coated pressing piece 12d for pressing the inner coating 61 while being sequentially pressed by the pressing piece 41 on the outer circumferential surface of the cylindrical body p of the clamp 10 in the same line as the pressing piece 41, 14b) is provided on-site assembly type optical connector. The method according to claim 2 or 3, The cross section of the clamp auxiliary body 14 corresponding to the core arrangement groove 12a is a field assembly type optical connector, characterized in that the flat planar structure to press the core wire 7 in the core arrangement groove 12a surface contact pressure . The method of claim 4, wherein As the pressing member 20 is in close contact with the outer circumferential surface of the clamp auxiliary body 14 corresponding to the pressing flat portion 14c of the clamp auxiliary body 14, the pressing member 20 may be in close contact with the pressing member 20. Field assembly type optical connector, characterized in that further formed obliquely projecting contact portion (14d, 14g). The method of claim 2, The clamp auxiliary body 14 is a field assembly type optical connector, characterized in that the core wire (7) in the core arrangement groove (12a) is made of a transparent material to the naked eye. The method of claim 2, The cylindrical body p of the clamp 10 is formed of a small diameter portion, and engaging jaws 12e and 14e are formed at its ends, and one end thereof is caught by the engaging jaws 12e and 14e, and the other end is covered with the clamp 40. Field assembly type optical connector, characterized in that the spring (s) is disposed so as to be caught on the locking step (40a) inside the elastic support for the clasp (40). The method of claim 1, Field assembly type optical connector, characterized in that the outer peripheral surface of the pressing member 20 is further provided with a handle 21 is exposed to the outside through the guide portion 32 of the frame (30). The method of claim 1, Confirmation window 33 penetrated so as to visually check the connection state between the core wire 7 of the core wire placement groove 12a and the core wire 62 introduced from the outside through the boot 50 on the outer circumferential surface of the frame 30. Field assembly type optical connector, characterized in that further provided. The method of claim 1, The boot 50 is formed of a tubular shaped first boot coupled to the cover clamp 40 and a second boot 54 shaped like a conical tube detachably coupled to the first boot 52. Field assembly optical connector. The method of claim 10, The inner circumferential surface of the first boot 52 allows the fiber yarns 64 between the inner sheath 61 and the outer sheath 63 of the optical fiber 60 introduced from the outside to be entangled together so as to secure their fastening. A thread 52a is formed, and a plurality of flat portions 44b formed in the longitudinal direction are formed on the outer circumferential surface 44 of the covering clamp 40 which is screwed with the thread 52a. Field assembly type optical connector, characterized in that provided. The method of claim 1, Field assembly type optical connector, characterized in that the outer housing 70 is further provided to cover and protect the frame (30) on the outside of the frame (30).

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