KR100970441B1 - An optical connector for assembling in the field - Google Patents

Abstract

The present invention relates to a field assembly optical connector that allows the operator to easily connect the optical fiber in the field.

The field assembly type optical connector of the present invention includes a housing, a plug inserted into and fixed to the housing, a ferrule to which the ferrule main line is coupled, and a fixture inserted into the plug; The ferrule main line and the main line of the optical cable including a fixing cap installed to have an elastic force in the longitudinal direction between the plug and the fixture, and a fixing member installed inside the fixing cap to fix the main line of the optical cable to connect with the ferrule main line In the field assembly type optical connector for connecting the connection, the optical cable is composed of the upper fixing portion and the lower fixing portion to which the main line is inserted and fixed, the fixing member formed with a gap is formed in one of the upper fixing portion or the lower fixing portion. Wow; A fixing cap having a through hole formed to insert the fixing member and having a wedge hole formed in the orthogonal direction in the through hole; Inserted into the wedge hole formed in the fixing cap includes a fixing wedge for pushing up the lower surface of the lower fixing portion, wherein the fixing wedge pushes the middle portion of the lower fixing portion to the upper portion of the lower fixing portion This is made to bend.

Fiber Optic, Field, Assembly, Optical Connectors

Description

Field-mountable optical connector {AN OPTICAL CONNECTOR FOR ASSEMBLING IN THE FIELD}

The present invention relates to a field assembly optical connector that allows the operator to easily connect the optical fiber in the field.

Recently, an FTTH (Fiber To The Home) system has been proposed that can provide various information including broadcasting and communication by connecting optical cables to general homes and is being applied to new apartments. In the FTTH system, an optical cable is connected to a wall in a home, for example, and an end thereof is finished in the form of a connector and installed on the wall. In this case, the FTTH worker sets the optical cable several meters longer than the actual length in consideration of the connection between the optical cables and introduces the optical cable into the home. In addition, the worker cuts the optical cable to the required length in the home construction site, assembles the optical connector at the end and connects it to the optical adapter and installs it on the wall inside the home.

On the other hand, a general optical fiber is composed of a core layer and a cladding layer, which is commonly referred to as a main line or a core line. The main line has a diameter of about 125 μm, and a coating layer is coated on the outside of the main line with a thickness of about 250 μm (hereinafter, referred to as a coating main line). An outer shell having a thickness of approximately 900 μm is coated on the outside of the coating layer (hereinafter, referred to as an element wire).

A jacket made of, for example, PVC is coated on the outer side of the element wire through a buffer material such as kevlar (aramid yarn) for strengthening tensile strength.

The optical fiber is to be able to transmit and receive the desired signal through the light transmitted through the core layer. Therefore, in the construction of the optical cable, it is necessary to accurately align the main line of the optical cable in order to minimize the transmission loss of the light.

As described above, the field assembly type optical connector of Korean Patent No. 00608409, the field assembly type optical connector of Korean Patent No. 0724076, and the field assembly type of Korean Patent No. 0669947 to accurately arrange the connection of the optical cable in the field. Various technologies are provided, such as an optical connector, an on-site assembled optical connector of Korean Patent Publication No. 10-2008-0037502, and an on-site assembled optical connector of Korean Publication No. 10-2008-0081789.

In the field assembly type optical connector of the Korean Patent No. 0608409, a ferrule is formed in the form of a cylinder for receiving and fixing the optical fiber therein, the flange is formed in the middle of the outer peripheral portion; A spring which is assembled to be wound around the rear end of the ferrule on the basis of the flange and is pressed by the front end of the ferrule on the flange; A tubular structure having a circular cross section, the stopper being assembled to completely surround the rear end of the ferrule and the outer circumference of the spring, and supporting the rear end of the spring; And a frame having a hole formed therein and surrounding the front end of the ferrule and the front end of the stopper, wherein the rear end of the ferrule is assembled from the stopper while the ferrule, the spring, the stopper, and the frame are assembled. Protruding field-simmered optical connectors are provided.

In the field assembly type optical connector of Korean Patent No. 0724076, a ferrule having an accommodating hole therein, a spring covering an outer circumferential surface of the rear end of the ferrule, and a spring covering the spring to be coupled to the rear end of the ferrule In the optical connector comprising a stopper, and a frame covering the rear end of the ferrule and the outer periphery of the front end of the stopper, wherein the core wires of the optical fiber are connected to each other in the rear end receiving hole of the ferrule exposed to the outside of the stopper. The rear end portion of the ferrule, which is the core wire connecting portion, is provided with a field sterilized optical connector made of a transparent glass ferrule so that the optical fiber core wire in the receiving hole can be visually checked.

In the field assembly type optical connector of Korean Patent No. 0669947, a housing surrounding and protecting the components, a plug movably inserted and fixed to the housing, a main line alignment member movably inserted and seated in the plug, and a main line alignment member A capping fixing cap for holding and sealing a portion of the main assembly to hold the optical fiber S inserted into the main alignment member, and a spring inserted and seated in the main fixing cap to support the main alignment member in one direction, and the main fixing cap and the main alignment member It consists of a fixing member which is inserted into the plug fixed to the plug while wrapping a portion of the protection member for wrapping and sealing the free end of the fixing member, the main line alignment member is a ferrule having a main line of a predetermined length disposed along the longitudinal direction, and one end When combined with the ferrule, the main line insertion hole communicates with the main line insertion hole of the ferrule, and a tube having a predetermined length at its free end On the side of the main line inserting hole, a longitudinal opening is formed, and the outer circumferential surface is formed of a flange having a guide part formed by coupling a fixing ring, and the main line fixing cap has a receiving hole for accommodating the main line alignment member. Is formed in communication with, the inner circumferential surface is provided with an on-site sterilized optical connector configured to be formed with a fixing groove for engaging the fixing ring of the guide portion,

In the field assembly type optical connector of Korean Patent Application Laid-Open No. 10-2008-0037502, in the optical connector for coupling the ferrule main line and the main line of the optical cable in an optical alignment state, the housing, the plug and the ferrule main line inserted into the housing are fixed. The ferrule is coupled to the ferrule, the ferrule holder for coupling the ferrule to the distal end, and the main line coupling member for coupling and fixing the ferrule main line and the main line of the optical cable, the fixing fixed to the plug while supporting the main line coupling member elastically A cap, a fixing member having a coupling member insertion hole into which the main coupling member is detachably inserted and fastened to the fixing cap and pressing the main coupling member in a direction perpendicular to the longitudinal direction, and the fixing member It is configured to include a protective cover detachably fastened to the plug while receiving the inside, The main coupling member includes a first and a second plate formed separately from each other along a longitudinal direction in which the main line is inserted, and the first plate is in communication with the ferrule holder and a first insertion groove for inserting the main line. And a second insertion groove for inserting the wire and the second wire are formed in communication with each other, the second plate is formed with a third insertion groove in a position corresponding to the second insertion groove, the first insertion groove has a V-shaped cross section On-site sterilized optical connector formed to have a shape is provided.

In the field assembly type optical connector of Korean Patent Application Laid-Open No. 10-2008-0081789, in the optical connector for coupling the ferrule main line and the main line of the optical cable in an optical alignment state, the housing, the plug and the ferrule main line inserted into the housing are fixed. Coupled ferrule, the ferrule holder for coupling the ferrule at the front end is provided with a main line coupling member for coupling and fixing the ferrule main line and the main line of the optical cable, a fixed cap fixedly coupled to the plug while supporting the main line coupling member elastically, A first fixing member having a coupling member insertion hole in which the main coupling member is detachably inserted and fastened to the fixing cap and pressing the central portion of the main coupling member in a direction perpendicular to the longitudinal direction; 1 While holding part of the fixing member and the end of the main alignment member, fix the optical cable protruding from the main alignment member. Is configured to include a second fixing member, and the second fixing member includes first and second clips formed separately from each other along a length direction in which the optical cable is inserted, and fastens or separates the first and second clips. Consists of the fastening means, the separation surface of the first and second clip has a coupling member insertion hole for fixing the end of the main coupling member, and an optical cable insertion groove for fixing the optical cable protruding from the end of the main coupling member Field assembly optical connectors are provided that are in communication with each other.

In the field assembly optical connector of Korean Patent No.0608409 and the field assembly optical connector of Korean Patent No. 0724076, the optical fiber is fixed by applying an adhesive to the inner circumferential surface of the boot when connecting another optical fiber connected to the optical fiber installed in the ferrule. By using the applied adhesive, it is impossible to reuse, and there is a disadvantage that the operator must hold the optical fiber until it solidifies with the adhesive to completely fix the optical fiber.

In the field assembly type optical connector of Korean Patent No. 0669947, the field assembly type optical connector of Korean Patent Publication No. 10-2008-0037502 and the field assembly type optical connector of Korean Patent Publication No. 10-2008-0081789 Insertion of the cylindrical main line fixing cap to the outer side of the main line alignment member formed with a hole to be inserted to fix the optical fiber in the hole of the main line alignment member has a weak fixing force for the main line alignment member to fix the optical fiber. In addition, when connecting the other optical fiber (main line) connected to the optical fiber installed in the ferrule incorrectly when the connection between the alignment member and the stationary cap is difficult to reuse difficult to reuse.

The present invention is invented to solve the above problems, the groove is formed so that the optical fiber (main line) to be connected to the optical fiber that is fixed to the ferrule is formed, the upper fixing portion and the lower fixing portion formed to have a predetermined interval Insert the fixing member into the inside of the fixing cap and install it, and insert a fixing wedge having a predetermined width into the lower surface of the lower fixing portion in the fixed cap to bend the lower fixing portion of the fixing member. By narrowing the gap formed between the fixing member and the lower fixing part, the optical fiber (main line) secured in the groove of the fixing member is firmly fixed, and in case of poor connection, the fixing wedge is pushed in the opposite direction to the entry direction. After fixing the fixing part to the original position, use the fixing wedge to fix the optical fiber and the new optical fiber fixed to the ferrule The purpose is to provide a field-mountable optical connector that can be easily connected to (site) in the field.

In addition, an object of the present invention is to provide an on-site assembly type optical connector that can be assembled without requiring a tool when connecting the optical fiber (main line) in the field.

Field assembly type optical connector of the present invention invented to achieve the above object,

A housing, a plug inserted into and fixed to the housing, a ferrule to which ferrule main lines are coupled, a fastener inserted into and fixed to the plug, and a fixing cap installed to have an elastic force in a longitudinal direction between the plug and the fastener; In the field assembly type optical connector for connecting the ferrule main line and the optical fiber main line, which is installed inside the fixing cap to fix the optical fiber main line to connect with the ferrule main line,

The fixing member is composed of the upper fixing portion and the lower fixing portion to which the optical fiber main line is inserted and fixed, wherein the fixing member has a gap formed in one of the upper fixing portion or the lower fixing portion, and the fixing member is formed. The fixing cap through-hole is formed to be inserted, the fixing cap formed with a fixing cap wedge hole formed in the orthogonal direction in the fixing cap through hole, and inserted into the fixing cap wedge hole to push the lower surface of the lower fixing portion upward The fixing wedge is made up, but the fixing wedge is configured to bend the middle part of the lower fixing part by pushing the middle part of the lower fixing part upward.

In the fixing member formed of the upper fixing portion and the lower fixing portion, the lower fixing portion is formed to be thinner than the upper fixing portion. This is for the lower fixing portion to bend easily by the fixing wedge.

The fixing wedge installed on the fixing cap and pushing up the lower fixing part upwardly has a stepped portion orthogonal to the longitudinal direction of the progression to form a lower surface and an upper surface, and have a predetermined width. The width of the fixing wedge is usually made of 3 ~ 10mm. Thus, the fixing wedge formed in a predetermined width increases the force acting on the lower fixing portion by pushing the lower fixing portion to a wide width.

The plug is formed with a plug wedge hole in which the fixing wedge is installed in the fixing cap wedge hole, and after the fixing cap is inserted into the plug to fix the plug wedge hole and the fixing cap wedge hole in a line. Is formed so that the fixing wedge is inserted from the outside of the plug, the plug wedge hole and the fixing cap wedge hole is formed to pass through in a row.

In the field assembly type optical connector of the present invention made as described above, in order to connect the ferrule main line and the optical fiber main line, the optical fiber main line is inserted into a fixing member having a gap, and a fixing wedge is inserted outside the plug to insert an intermediate portion of the lower fixing part. It is characterized by the strong fixation of the optical fiber main line by making it bend like a bow.

That is, as the middle portion of the lower process member is bent like a bow, the length of the fixing member fixing the optical fiber becomes longer, thereby increasing the fixing force.

As described above, the fixing wedge is inserted from the outside of the plug to reduce the gap of the fixing member so that the optical fiber can be connected more easily.

In addition, there is an effect that can prevent the breakage of the main line caused by the biasing holding force by acting to the fixing force to the long length of the optical fiber main line.

In addition, there is a feature that does not require a separate tool by pushing the fixing wedge by hand to fix the optical fiber (main line) with the fixing member.

With reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In the field assembly type optical connector of the present invention, the optical fiber main line 1 and the ferrule main line 2 are connected in the field as shown in FIG. 1, and the boot 10 having the boot through hole 10a largely formed as shown in FIGS. 2 to 4. ), A fastener 20 fixed to the boot 10 and having a fastener through-hole 20a formed therein, an elastic member 40 built into the fastener through-hole 20a, and the fastener through-hole 20a. A portion is inserted into and installed to be elastically supported by the elastic member 40, the fixing cap 50 and the fixed cap wedge hole 51 is formed, and the fixed cap through hole (50a) The fixing member 30 is installed in the fixing member 30 for fixing the optical fiber main line 1, the fixing wedge 60 is inserted into the fixing cap wedge hole 51, and a portion of the fixing tool 20 is inserted and fixed A plug 70, a ferrule 80 provided with the ferrule main line 2, a ferrule protection cap 85 protecting one end of the ferrule 80; Consists of a housing 90 fixed to the plug group (70) is inserted.

The boot 10 has a cylindrical shape as shown in FIG. 2, the boot through hole 10a is formed as shown in FIG. 4, and a boot unevenness 11 is formed on an inner circumferential surface thereof. The boot recess 11 is inserted into a fixture recess 21 formed on an outer circumferential surface of the fixture 20 to be installed later, so that the boot 10 is fixed to the fixture 20.

The boot 10 is to be inserted into one side of the optical fiber is inserted through the boot through hole (10a), as shown in Figure 4 the diameter of the tip portion is usually exposed to prevent the shaking of the optical fiber is inserted and installed It is formed as small as the diameter size of the optical fiber.

The fastener 20 is formed in a cylindrical shape as shown in FIG. 2, the fastener groove 21 is formed at one side of the outer circumferential surface thereof, and a fastener protrusion 22 is formed at the other side thereof, and the fastener through hole 20a as shown in FIG. 4. It is formed, but is formed in multiple stages.

The fastener 20 has one end portion inserted into the boot through hole 10a as shown in FIG. 9, and the fastener recess 21 is coupled to the boot unevenness 11 so that the boot 10 is attached to the fastener 20. Fix it.

Rings 20 'may be installed at the front end of the fixture 20 as shown in FIGS. 2 to 4 and 9, and the ring 20' prevents the shaking of the optical fiber inherent.

The elastic member 40 uses a coil spring as shown in FIG. 2, and as shown in FIGS. 9 and 10 (b), an optical fiber may be formed in the fixing cap 50 which is installed in the fixture through-hole 20a and is laid down. It gives elastic force in the axial direction.

The fixing cap 50 is formed in a cylindrical shape as shown in Figure 2, is formed to be short on the outer circumferential surface by varying the size of the diameter, the positioning groove 55 is formed on a portion of the outer circumferential surface, the fixed cap wedge A hole 51 is formed, and the fixed cap through-hole 50a is formed as shown in FIG. 4, and the fixed cap through-hole 50a is formed so as to be connected to the inner circumferential surface by varying the size of the diameter.

The fixing cap wedge hole 51 is formed in a rectangular shape as shown in Figure 4 is formed in the middle portion of the fixing cap 50, as shown in Figure 6 extends in the fixing cap through-hole 50a and penetrates in an orthogonal direction Is formed.

The positioning groove 55 is coupled to a plug protrusion (not shown) formed inside the plug 70 to be rearranged to set a position at which the fixing cap 50 is inserted into the plug 70 and installed. . This allows the fixing cap wedge hole 51 and the plug wedge hole 71 formed in the plug 70 to be rearranged to be aligned in a line.

The fixing member 30 is composed of an upper fixing part 31 and a lower fixing part 35, as shown in Figs. 2 and 12, the cross section of the upper fixing part 31 and the lower fixing part 32 is shown in FIG. 6 is formed in a semi-circular shape, but as shown in FIG. 12, the lower side of the lower fixing part 32 has a flat lower bottom surface 37.

The lower fixing part 32 has a main line fixing groove 38 in which the optical fiber main line 1 is seated in the longitudinal direction as shown in FIG. 12, and a gap 36 is formed.

The gap projection 36 is a gap between the upper fixing portion 31 and the lower fixing portion 35 to be formed is usually formed symmetrically on both sides with respect to the main line fixing groove 38, the lower It may be formed on the upper fixing portion 31, not the fixing portion 32.

The main line fixing groove 38 is usually formed in a 'V' shape.

The fixing member 30 is usually formed to be separated into the upper fixing portion 31 and the lower fixing portion 35 as shown in FIG. 12, but may be formed in one piece having a gap formed therein.

The fixing member 30 is deformed as shown in FIGS. 13 and 14 by the fixing wedge 60 installed in the lower portion to fix the optical fiber main line 1 installed in the main line fixing groove 38. . That is, when the fixing wedge 60 is pushed to the same state as in FIG. 14 (a) in the state as shown in FIG. 13, the fixing wedge 60 pushes up the middle portion of the lower fixing stand 35. As shown in FIG. 14B, the lower fixing part 35 is bent like a bow. As such, when the lower fixing part 35 is bent like a bow, the gap between the upper fixing part 31 and the lower fixing part 35 is reduced, and thus the lower fixing part 35 is seated in the main fixing groove 38. The optical fiber main line 1 is pressed and fixed to the upper fixing part 31 and the lower fixing part 35.

The fixing wedge 60 contacts the lower bottom surface 37 of the lower fixing part 35 to fix the optical fiber main line 1 as shown in FIGS. 13 and 14, and shows the lower fixing part 35. The upper portion is pushed upward to bend the middle portion of the lower fixing part 35 as a bow. FIG. 13 shows the state when the optical fiber main line 1 is unfixed, and FIG. 14 shows the optical fiber main line 1 It shows the state when fixing.

The fixing wedge 60 is formed with a stepped jaw 61 orthogonal to the traveling direction as shown in FIG. 13 so that the lower surface 62 and the upper surface 63 are formed, thereby fixing the optical fiber main line 1. The fixing wedge 60 is advanced in the direction of the arrow shown in (a) of FIG. 13 so that the lower bottom surface 37 is in contact with the upper surface 63 at the lower surface 62 and the lower bottom surface. (37) push the upper part to bend the middle part.

The stepped step 61 is preferably formed to be inclined.

The fixing wedge 60 has a predetermined width W, and is preferably formed of 3 to 10 mm. The fixing wedge 60 has a predetermined width W to push the lower fixing part 35 to a wide surface (length) so that a strong fixing force is applied.

The plug 70 has a plug wedge hole 71 into which the fixing wedge 60 is inserted to the outside as shown in FIG. 2, and a fixture receiving hole 72 to which the fixture projection 22 is coupled, and is sewn up. Plug concave and convex 73 for fastening with the housing 90 is formed, the plug through-hole 70a is formed on the inside as shown in FIG. The plug protrusion (not shown) coupled to the positioning groove 55 formed on the outside of the 50 is formed.

The plug wedge hole 71 is formed to be in the same line as the fixing cap wedge hole 51 as shown in Figure 6 so that the fixing wedge 60 is inserted into the fixing cap wedge hole 51.

9 and 10 (b), the fastener 20 is inserted into one side of the plug through hole 70a, and the inserted fastener 20 is a fastener protrusion 22. And the fixture holding hole 72 are coupled and fixed, and the fixing cap 50 is installed between the fixture 20 and the plug 70 as shown in FIG.

As shown in (b) of FIG. 10, one side of the fixing cap 50 installed between the fixing tool 20 and the plug 70 is supported by the elastic member 40, and the other side of the plug 70 It is supported by the end formed inside.

The ferrule 80 is the ferrule main line 2 is fixed as shown in Figs. 2 and 4, one end is provided with a ferrule protective cap 85 as shown in Figs.

The housing 90 is formed such that the housing through-hole is formed in the inner side as shown in Figure 4 so that the plug 70 is inserted inward.

In the field assembly type optical connector of the present invention configured as described above, the fixture 20 is inserted into and fixed to one side of the boot 10, and the elastic member 40 is provided inside the fixture 20. After being inserted, one side of the fixing cap 50 in which the fixing member 30 is installed is inserted, and the plug 70 is installed at the other end of the fixing cap, and the plug 70 is the fixture 20 ) Is fixed and installed. The optical fiber main line 1 is inserted into the main line fixing groove 38 of the fixing member 30 in the coupled state in the boot 10 in the coupled state, and the ferrule main line 2 is fixedly installed. Ferrule 80 is inserted into the main line fixing groove 38 in a direction opposite to the optical fiber main line (1) is formed in a state as shown in (b) of FIG.

In the state of FIG. 10 (b) as described above, by inserting the fixing wedge 60 from the outside of the plug 70 to reduce the gap of the gap formed in the fixing member 30 to connect the optical fiber. .

The fixing wedge 60 is inserted before the optical fiber main line 1 and the parule main line 2 is placed in the fixing member 30 and formed in the state as shown in FIG. The optical fiber main line 1 is inserted in the boot 10 direction, and the ferrule main line 2 is inserted in the opposite direction, and then the fixing wedge 60 is pushed to lower the bottom of the lower fixing part 35. The surface 37 is pushed upward to allow the middle portion of the lower fixing portion 35 to bend like a bow so as to reduce the gap between the upper fixing portion 31 and the lower fixing portion 35 to reduce the gap. Fix the main line (1).

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1 is a perspective view of a field assembly optical connector showing a temporary embodiment of the present invention.

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

Figure 3 is an exploded view of the field assembly optical connector showing a temporary embodiment of the present invention.

Figure 4 is an exploded cross-sectional view of the field assembly optical connector showing a temporary embodiment of the present invention.

5 is a plan view of a field assembly optical connector showing a temporary embodiment of the present invention.

6 is a cross-sectional view taken along the line A-A of FIG.

Figure 7 is a perspective view of the housing of the field assembly optical connector showing a temporary embodiment of the present invention.

8 is a plan view of FIG. 7.

9 is a cross-sectional view taken along the line B-B in FIG. 8;

10 is a perspective view of a fixing member showing a preferred embodiment of the present invention.

11 is a cross-sectional view before the optical fiber (main line) is fixed to the fixing member.

12 is a cross-sectional view after the optical fiber (main line) is fixed to the fixing member.

13 is a partially enlarged cross-sectional view of the front and side before the optical fiber (main line) is fixed to the fixing member.

14 is a partially enlarged cross-sectional view of the front and side after the optical fiber (main line) is fixed to the fixing member.

[Explanation of symbols on the main parts of the drawings]

1, 2: arrange 10: boot

20: fastener 30: fixed member

31: upper fixing part 35: lower fixing part

36: crevice 37: bottom surface

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38: fixed fixing groove 40: elastic member

50: fixed cap 51: fixed cap wedge groove

60: fixing wedge 70: plug

61: step 62: lower surface

63: upper surface 80: ferrule

85: ferrule protective cap 90: housing

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Claims (5)

A housing, a plug inserted into and fixed to the housing, a ferrule in which ferrule main lines are coupled, a fastener inserted into and fixed to the plug, and a fixing cap installed to have an elastic force in a longitudinal direction between the plug and the fastener; In the field assembly type optical connector is installed on the inside of the fixing cap comprising a fixing member for fixing the optical fiber main line to connect with the ferrule main line, The fixing member includes an upper fixing portion and a lower fixing portion to which the optical fiber main line is inserted and fixed, and a gap is formed by forming a gap at one of the upper fixing portion and the lower fixing portion. The fixing cap has a fixing cap through hole is formed so that the fixing member is inserted, the fixing cap wedge hole formed in the orthogonal direction in the fixing cap through hole is formed, Inserted into the fixing cap wedge hole to push the lower surface of the lower fixing portion upwards, and further comprises a fixing wedge is formed with a stepped orthogonal to the insertion direction perpendicular to the lower surface, When the lower surface of the fixing wedge is positioned to face the middle portion of the lower fixing part, the optical fiber main line and the ferrule main line are inserted between the upper fixing part and the lower fixing part, and are disposed primarily. When the fixing wedge moves in the insertion direction, and the upper surface of the fixing wedge is positioned to face the middle portion of the lower fixing part, the middle of the lower fixing part is bent so that the middle part of the lower fixing part is bent. And pushing up a portion to fix the optical fiber main line and the ferrule main line disposed between the upper fixing part and the lower fixing part. The method of claim 1, wherein the lower fixing portion Field assembly type optical connector, characterized in that the thickness is thinner than the upper fixing portion. delete According to claim 1, The plug wedge hole is formed in a position corresponding to the fixing cap wedge hole, The fixing wedge is a field assembly type optical connector, characterized in that through the plug wedge hole and the fixing cap wedge hole in a row from the outside of the plug to push the lower surface of the lower fixing portion upward. delete

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