JP5193920B2 - Optical connector and optical fiber holder - Google Patents

Description

  The present invention relates to an on-site assembly type optical connector and an optical fiber holder used therefor, and more particularly to an optical fiber built-in type optical connector and an optical fiber holder used therefor.

  As an example of an optical connector that can be assembled to the tip of an optical fiber cable at a work site, there is one in which a built-in optical fiber is inserted and fixed in advance in an optical ferrule. In this type of optical connector, the end of the optical fiber to be terminated is connected to the end of the built-in optical fiber (see, for example, Patent Documents 1 and 2).

JP 2002-323642 A Japanese Patent No. 3210540

In this type of optical connector, a mechanism for holding the optical fiber cable is required. However, the structure of the holding mechanism is complicated for stable holding, and assembly work may be time-consuming.
The present invention has been made in view of the above circumstances, and provides an optical connector that can be easily assembled at a work site and that can stably hold an optical fiber cable, and an optical fiber holder used in the optical connector. The purpose is to do.

The present invention provides a connector body having a connection mechanism for connecting an external optical fiber drawn out from an optical fiber cable having a substantially rectangular cross section to an internal optical fiber inserted and fixed to an optical ferrule, and the optical fiber cable to the connector. An anchoring mechanism for retaining the optical fiber cable; and an anchoring means capable of retaining the optical fiber holder on the connector body; The fiber holder is capable of inserting the optical fiber cable into a space surrounded by the bottom wall portion, side wall portions provided on both side edges thereof, and the top wall portion, and intersects the inner surface of the side wall portion in the cable insertion direction. A side surface holding projection that extends in the direction to hold and presses and holds the side surface of the optical fiber cable is formed. A top surface holding projection is formed to press and hold the upper surface of the optical fiber cable in a substantially dotted shape, and the lower surface of the optical fiber cable is pressed and held in a substantially dotted shape on the inner surface of the bottom wall portion. A bottom surface holding projection having a height from the inner surface of the bottom wall portion of 0.05 mm to 0.2 mm is formed. The bottom surface holding projection has a conical shape and is formed on the bottom surface of the recess provided on the inner surface of the bottom wall portion. Provided is an optical connector formed so as to be surrounded by the bottom surface thereof.
It is preferable that the top surface holding protrusion is formed on the bottom surface of a recess provided on the inner surface of the top wall portion.
The optical fiber holder is preferably an integrally molded product made of a synthetic resin of polyoxymethylene or polypropylene.
The distance between the side surface holding projection of one of the side wall portions and the side surface holding projection of the other side wall portion is not less than the maximum value -0.7 (mm) of the width W1 of the optical fiber cable and the minimum value of the width W1. It is preferably −0.2 (mm) or less.
The angle formed by the front surface and the rear surface of the side surface holding projection is preferably 55 to 85 degrees.
In the present invention, a plurality of the side surface holding projections are formed at intervals in the cable insertion direction, and the maximum distance in the cable insertion direction of two of the plurality of side surface holding projections formed on at least one side wall portion is , 2.5 mm or more is preferable.
It is preferable that the length of the front end portion of the side surface holding projection in the extending direction is not less than the height H1-0.5 (mm) of the optical fiber cable.
The distance between the inner surface of the bottom wall portion and the top surface holding projection is not less than the maximum value −0.5 (mm) of the height H1 of the optical fiber cable and not more than the minimum value (mm) of the height H1. It is preferable.
It is preferable that the top surface holding protrusion is formed in a substantially conical shape or a substantially truncated cone shape, and an angle formed by both side surfaces in a cross section passing through the central axis is 45 to 75 degrees.

The present invention provides a connector body having a connection mechanism for connecting an external optical fiber drawn out from an optical fiber cable having a substantially rectangular cross section to an internal optical fiber inserted and fixed to an optical ferrule, and the optical fiber cable to the connector. And an anchoring mechanism for retaining the optical fiber cable in an optical connector provided with the main body, and can be retained on the connector main body by the anchoring means constituting the anchoring mechanism. The optical fiber cable can be inserted into a space surrounded by the side wall portion and the ceiling wall portion, and the side surface of the optical fiber cable extends to the inner surface of the side wall portion in a direction crossing the cable insertion direction. Side holding protrusions are formed to press and hold, and the top surface of the optical fiber cable is formed on the inner surface of the top wall. A top surface holding projection that is pressed and held in a dot shape is formed, and the inner surface of the bottom wall portion is a height from the inner surface of the bottom wall portion that presses and holds the lower surface of the optical fiber cable in a substantially dotted shape. Is formed with a conical shape, and the bottom surface of the concave portion provided on the inner surface of the bottom wall is surrounded by the bottom surface. An optical fiber holder formed as described above is provided.

According to the present invention, the side surface holding projections are formed on both side walls of the optical fiber holder, and the top surface holding projection and the bottom surface holding projection are formed on the top wall portion and the bottom wall portion, respectively. It can be sandwiched by the protrusions from both sides and from the top and bottom, enabling stable holding.
The top surface holding projection and the bottom surface holding projection of the optical fiber holder press the optical fiber cable in a substantially dotted shape, so that the pressing force is concentrated and acts to increase the holding force of the optical fiber cable. Can do.
In addition, the top and bottom holding projections are formed so as to press the optical fiber cable substantially in the form of a dot. Therefore, the elastic repulsion force during compression deformation is small, and the optical fiber holder is attached to the optical fiber cable. The work to do becomes easy.
Therefore, the optical fiber cable can be stably held without impairing assembly workability.

It is a perspective view showing one embodiment of the optical connector of the present invention. It is a perspective view which shows an optical fiber holder. It is a perspective view which shows an optical fiber holder. It is a perspective view which shows an optical fiber holder. It is a perspective view which shows an optical fiber holder. It is a top view which shows typically an optical fiber holder. It is a sectional side view which shows typically an optical fiber holder. It is a cross-sectional view schematically showing an optical fiber holder. It is sectional drawing which shows the optical fiber cable which can apply this invention. It is a side view which shows the external appearance of an optical connector. It is a side view which shows a retention cover. It is a top view which shows a retention cover. It is process drawing which shows the assembly process of an optical connector. It is process drawing which shows the assembly process of an optical connector. It is a perspective view which shows the optical fiber cable which can apply this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing an optical connector 60 according to an embodiment of the present invention. 2 to 5 are perspective views showing the optical fiber holder 53. FIG. 6 is a plan view schematically showing the optical fiber holder 53. FIG. 7 is a side sectional view schematically showing the optical fiber holder 53. FIG. 8 is a cross-sectional view schematically showing the optical fiber holder 53. FIG. 9 is a cross-sectional view showing an optical fiber cable 14 to which the present invention can be applied. FIG. 10 is a side view showing the appearance of the optical connector 60. FIG. 11 is a side view showing the retaining cover 54. FIG. 12 is a plan view showing the retaining cover 54. 13 and 14 are process diagrams showing an assembly process of the optical connector 60. FIG. FIG. 15 is a perspective view showing the optical fiber cable 14 to which the optical connector 60 can be applied.
In the following description, the front end direction of the optical ferrule 1 may be referred to as the front, and the right side may be referred to as the rear.

As shown in FIG. 1, the optical connector 60 can be assembled at the tip of the optical fiber cable 14.
As illustrated in FIG. 15, the optical fiber cable 14 has a substantially rectangular cross section. In the optical fiber cable 14 illustrated here, the optical fiber 13 and the tensile body 18 are collectively covered with a coating 14a (outer jacket). The optical fiber cable 14 is a so-called indoor cable and corresponds to an optical element portion of an optical drop cable.

The height H1 of the side surface 14b of the optical fiber cable 14 in this example is larger than the width W1 of the upper surface 14d and the lower surface 14e (see FIG. 9). The height H1 may be smaller than the width W1 or may be equal to the width W1.
A tearing notch 14 c can be formed on the side surface 14 b of the optical fiber cable 14.
The optical fiber 13 (external optical fiber) led out from the optical fiber cable 14 is, for example, an optical fiber core or an optical fiber. The distal end portion 13a is, for example, a bare optical fiber drawn from the optical fiber 13.

As shown in FIG. 1, the optical connector 60 includes a connector main body 10 and a retaining mechanism 50 that holds the optical fiber cable 14 to the connector main body 10.
As shown in FIG. 10, the connector body 10 is attached to the ferrule 3 with a connection mechanism, the housing 4 that houses the ferrule 3 with the connection mechanism, the biasing means 5 provided in the housing 4, and the outside of the housing 4. A possible knob 7 is provided.
The housing 4 is formed in a sleeve shape that accommodates the ferrule 3 with a connection mechanism.
The ferrule 3 with a connection mechanism includes an optical ferrule 1 (hereinafter simply referred to as a ferrule 1) and a connection mechanism 2 provided on the rear end side of the ferrule 1.

An optical fiber introduction hole (fine hole) (not shown) is formed in the ferrule 1 along the central axis, and a built-in optical fiber 6 (such as a bare optical fiber) is inserted and fixed in the optical fiber introduction hole. Has been. The front end of the built-in optical fiber 6 is exposed at the front end surface 1 a of the ferrule 1, and the rear end protrudes from the rear end of the ferrule 1 and is inserted into the connection mechanism 2.
The connection mechanism 2 butt-connects the rear end portion of the built-in optical fiber 6 to the front end portion 13 a of the optical fiber 13. Reference numeral C <b> 1 is a connection point between the optical fibers 6 and 13.
As the connector body 10, for example, an SC type optical connector can be used.

As shown in FIGS. 1 and 10, the drawing mechanism 50 includes a main body 51, a movable receiving piece 52 provided to be movable back and forth with respect to the main body 51, and an optical fiber holder 53 (which holds the optical fiber 13). Gripping member) and a retaining cover 54 (stretching means) for retaining the optical fiber holder 53.
The main body 51 includes a long plate-like bottom plate 56 extending in the front-rear direction and side plates 57 erected from both side edges (see FIG. 11).
The movable receiving piece 52 is formed in a long plate-like tray shape along the front-rear direction, and the optical fiber holder 53 can be placed at the rearmost part, and slides along the front-rear direction on the bottom plate 56 of the main body 51. it can.

As shown in FIGS. 1 and 2, the optical fiber holder 53 holds the optical fiber cable 14 to the connector main body 10, and includes a holding portion 21 that holds the optical fiber cable 14, and a front side from the holding portion 21. It has the extended wall part 22 extended.
As shown in FIG. 2 and FIG. 3, the holding portion 21 has a U-shaped holding portion main body 25 with side wall portions 24, 24 standing on both side edges of the bottom wall portion 23, and one side wall portion 24. The ceiling wall part 26 connected so that it could move freely.
A space surrounded by the bottom wall portion 23, the side wall portions 24, 24, and the top wall portion 26 is an insertion space 27 through which the distal end portion of the optical fiber cable 14 can be inserted, and is formed on the inner surfaces of the front portions of the side wall portions 24, 24. Are formed with stopper protrusions 28 and 28 against which the front end of the coating 14a of the optical fiber cable 14 is abutted.

Side surface holding projections 31, 31 that press and hold the side surface 14 b of the optical fiber cable 14 are formed on the inner surfaces of the one and other side wall portions 24, 24.
The side surface holding projection 31 is a ridge extending substantially perpendicular to the front-rear direction (the insertion direction of the optical fiber cable 14), and can be formed so as to be able to contact the side surface 14b over almost the entire height range.
The side surface holding projection 31 is in contact with the side surface 14b of the optical fiber cable 14 in a state of being elastically compressed and deformed, and the side surface 14b is pressed by the elastic force to sandwich and hold the optical fiber cable 14.
The extending direction of the side surface holding projections 31 is not limited to the direction perpendicular to the front-rear direction (insertion direction of the optical fiber cable 14), and may be any direction that intersects the front-rear direction.

The top wall portion 26 is connected to the side wall portion 24 via a hinge portion 26a formed on one side edge, and opens and closes the upper opening portion 27a of the insertion space 27 by rotating about the hinge portion 26a. it can.
An outer wall portion 29 that is substantially perpendicular to the top wall portion 26 is formed on the other side edge of the top wall portion 26. The outer wall 29 is formed with an engaging portion 29a that is a recess or an opening that can be engaged with the engaging protrusion 24a on the outer surface of the side wall portion 24 in a state in which the top wall portion 26 is closed.

FIG. 6 is a plan view schematically showing the holder main body 25 of the optical fiber holder 53. 6 to 8 are schematic diagrams, the structure, shape, dimensions, and the like of each part may be different from those shown in FIGS.
As shown in FIG. 6, the side surface holding projection 31 can be formed in a substantially trapezoidal cross section. The side surface holding projection 31 in the illustrated example is an inclined surface in which the front surface 31a and the rear surface 31b are inclined with respect to the front-rear direction (insertion direction of the optical fiber cable 14), and the tip portion 31c is formed flat.
In the illustrated example, the tip portion 31c is formed flat, but the tip portion can be formed in a circular arc shape in cross section. The radius of curvature of the cross section of the tip can be set to 0.25 mm or less, for example. Further, as in the example shown in FIG. 2, the side surface holding projection 31 can be formed in a triangular cross section.

The distance L1 between the side surface holding projection 31 of the one side wall portion 24 and the side surface holding projection 31 of the other side wall portion 24 (the distance between the tip portions) is −0.7 (the maximum value of the width W1 of the optical fiber cable 14). mm) or more, the operation of pushing the optical fiber cable 14 into the insertion space 27 can be facilitated.
When the distance L1 is equal to or less than the minimum value -0.2 (mm) of the width W1 of the optical fiber cable 14, the side surface holding projection 31 can press the optical fiber cable 14 with sufficient force (elastic force), and a high holding force is obtained. can get.
That is, the workability of assembling the optical connector 60 can be achieved by setting the distance L1 to be not less than the maximum value −0.7 (mm) of the width W1 of the optical fiber cable 14 and not more than the minimum value −0.2 (mm) of the width W1. The optical fiber cable 14 can be stably held without adversely affecting the above.
The “maximum value of the width W1” means the maximum value of the width of the optical fiber cable 14 in the range located in the insertion space 27, and the “minimum value of the width W1” means the optical fiber cable 14 in this range. The minimum value of the width. Since the width W1 of the optical fiber cable 14 in this range is generally substantially constant, the maximum value and the minimum value are approximately equal, but they may be slightly different.

  The angle A1 formed by the front surface 31a and the rear surface 31b of the side surface holding projection 31 is preferably 55 to 85 degrees. By setting the angle A1 within this range, the elastic force exerted on the optical fiber cable 14 by the side surface holding projection 31 that has been compressed and deformed can be increased, and the optical fiber cable 14 can be stably held.

A plurality of side surface holding protrusions 31 can be formed at intervals in the front-rear direction. In the illustrated example, three side surface holding projections 31 are formed on each of the side wall portions 24, 24, and the position of the side surface holding projection 31 in the front-rear direction is substantially the same in contrast between one side wall portion 24 and the other side wall portion 24. It is.
For this reason, the optical fiber cable 14 can be sandwiched and held stably by the side holding projection 31 on one side and the side holding projection 31 on the other side.

Of the side surface holding projections 31 formed on the same side wall 24, the maximum distance in the front-rear direction, that is, the side surface holding projection 31 (reference number 31A) at the forefront, and the side surface holding projection 31 (reference number 31B) at the rear end The distance L2 is preferably 2.5 mm or more.
By setting the distance L2 within this range, the optical fiber cable 14 can be held over a sufficient length range, so that the optical fiber cable 14 can be stably held.
It is preferable that the distance L2 between the side surface holding protrusions 31A and 31B be in the above range in at least one of the two side wall portions 24 and 24.
The distance L2 is the distance between the center portion in the front-rear direction of the side surface holding projection 31A and the center portion in the front-rear direction of the side surface holding projection 31B.

  As shown in FIG. 8, the length L3 in the extending direction of the tip 31c of the side surface holding projection 31 is preferably not less than the height H1-0.5 (mm) of the optical fiber cable 14 (FIGS. 7 and 7). (See FIG. 9). By setting the length L3 within this range, the optical fiber cable 14 can be held over a sufficient height range, and stability can be improved.

As shown in FIG. 2, a top surface holding projection 33 is formed on the inner surface (lower surface) of the top wall portion 26 to press and hold the upper surface 14 d of the optical fiber cable 14 in a substantially dotted shape.
The top surface holding projection 33 can hold the optical fiber cable 14 by abutting against the upper surface 14d of the optical fiber cable 14 while being elastically compressed and deformed, and pressing the upper surface 14d by its elastic force.

A plurality of top surface holding projections 33 can be formed at intervals in the front-rear direction. In the example shown in FIG. 2, two top surface holding projections 33 are formed, and each has a substantially conical shape. These top surface holding projections 33 and 33 press a very narrow range (that is, substantially in the form of a dot) of the upper surface 14d of the optical fiber cable 14 at the tip portion.
The position of the top surface holding projections 33, 33 in the width direction is not particularly limited, but it is preferable to form the top surface holding projections 33 at substantially the center position in the width direction of the top wall portion 26. In the illustrated example, the top surface holding projection 33 is formed on the bottom surface (top surface) of the recess 35 provided on the inner surface of the top wall portion 26.

FIG. 7 is a side sectional view schematically showing the optical fiber holder 53. The top surface holding projection 33 shown in this figure has a substantially conical shape with a tip portion formed in a circular arc shape in cross section.
The position in the width direction of the top surface holding projection 33 is not particularly limited, but it is preferable to form the top surface holding protrusion 33 at a substantially central position in the width direction of the top wall portion 26.
As shown in FIG. 7, the distance L4 from the inner surface of the bottom wall portion 23 to the top surface holding projection 33 is not less than the maximum value of the height H1 of the optical fiber cable -0.5 (mm) and the minimum value of the height H1. (Mm) or less is preferable.
By setting the distance L4 within this range, the optical fiber cable 14 can be stably held without adversely affecting the assembly workability of the optical connector 60.
The “maximum value of the height H1” means the maximum value of the height of the optical fiber cable 14 in the range located in the insertion space 27, and the “minimum value of the height H1” means the light in this range. This is the minimum height of the fiber cable 14.

As shown in FIGS. 7 and 8, the angle A2 formed by both side surfaces in a cross section passing through the central axis of the top surface holding projection 33 formed in a substantially conical shape is preferably 45 to 75 degrees. By setting the angle A2 within this range, the elastic force applied to the optical fiber cable 14 by the compression-deformed top surface holding projection 33 can be increased, and the optical fiber cable 14 can be stably held.
The radius of curvature of the cross section at the tip of the top surface holding projection 33 formed in a circular arc shape can be set to 0.25 mm or less, for example.
The top surface holding projection 33 can also be formed in a substantially truncated cone shape.

As shown in FIG. 2, a bottom surface holding projection 32 is formed on the inner surface (upper surface) of the bottom wall portion 23 to press and hold the lower surface 14 e of the optical fiber cable 14 in a substantially dot shape.
The bottom surface holding projection 32 abuts on the lower surface 14e of the optical fiber cable 14 in a state of being elastically compressed and deformed, and the optical fiber cable 14 can be held by pressing the lower surface 14e by its elastic force.

As shown in FIGS. 2 and 7, the bottom surface holding projection 32 can be formed in a substantially conical shape.
The position in the width direction of the bottom surface holding projection 32 is not particularly limited, but it is preferable to form it at a substantially central position in the width direction of the bottom wall portion 23.
As shown in FIG. 7, the height H2 of the bottom surface holding projection 32 from the inner surface of the bottom wall portion 23 is preferably 0.05 to 0.2 mm. By setting the height H2 within this range, the optical fiber cable 14 can be stably held without adversely affecting the assembly workability of the optical connector 60.
The angle formed by the both side surfaces in the cross section passing through the central axis of the bottom surface holding projection 32 is preferably 55 to 85 degrees. In the illustrated example, the bottom surface holding projection 32 is formed on the bottom surface of the recess 34 provided on the inner surface of the bottom wall portion 23.
The bottom surface holding projection 32 can also be formed in a substantially truncated cone shape.

As shown in FIGS. 2 and 7, the number of the bottom surface holding projections 32 can be one, but a plurality can be formed at intervals in the front-rear direction. In the illustrated example, two bottom surface holding projections 32 are formed.
The front and rear direction positions of the bottom surface holding projections 32 shown in FIGS. 2 and 7 are substantially the same as the front and rear direction positions of the top surface holding projections 33. Therefore, the optical fiber cable 14 is sandwiched between the bottom surface holding projections 32 and the top surface holding projections 33. Can be held stably.
The extending wall portion 22 has a rectangular plate shape, and is formed to extend forward from the front ends of the side wall portions 24, 24.

The optical fiber holder 53 can be an integrally molded product made of a synthetic resin such as polyoxymethylene (POM, polyacetal) or polypropylene.
The bending elastic modulus (based on JIS K7203) of the constituent material of the optical fiber holder 53 is preferably 1200 MPa to 2700 MPa. By setting the bending elastic modulus within this range, it is possible to make the hinge portion 26a difficult to break and to increase the force for gripping the optical fiber cable 14.

As shown in FIGS. 3 to 5, the top wall portion 26 is opened, the distal end portion of the optical fiber cable 14 is pushed into the insertion space 27 from the upper opening portion 27 a, and the top wall portion 26 is rotated to rotate the upper opening portion. By closing 27 a, the optical fiber cable 14 can be accommodated in the insertion space 27.
Since the optical fiber cable 14 is sandwiched between the side surface holding projections 31 and 31 from both sides, and is sandwiched between the top surface holding projection 33 and the bottom surface holding projection 32 from above and below, stable holding is possible.
Since the top surface holding projection 33 and the bottom surface holding projection 32 press the optical fiber cable 14 in a substantially dot shape, the pressing force concentrates and acts, so that the holding force of the optical fiber cable 14 can be increased. .
Moreover, since the top surface holding projection 33 and the bottom surface holding projection 32 are formed so as to press the optical fiber cable 14 in a substantially dotted shape, the elastic repulsion force during compression deformation does not become excessive, and the optical fiber The work of attaching the holding body 53 to the optical fiber cable 14 becomes easy.
Therefore, the optical fiber cable 14 can be stably held without impairing assembly workability.

As shown in FIGS. 11 and 12, the retaining cover 54 includes a top plate 41 and side plates 42 provided on both side edges of the top plate 41.
The retaining cover 54 is rotatably attached to the housing 4 at a shaft portion 43 formed at one end portion in the longitudinal direction of the both side plates 42, and has an open position shown in FIGS. 11 to 14 and a closed position shown in FIG. Can be rotated between.
As shown in FIGS. 10, 13, and 14, the retaining cover 54 can accommodate the optical fiber holder 53 by rotating to the closed position when the optical fiber holder 53 is in the foremost position. In the closed position, the rearward movement of the optical fiber holder 53 is restricted by the drawing projection 44 formed at the other longitudinal end of the drawing cover 54.

  As shown in FIG. 10, it is preferable to set the length of the optical fiber 13 so that the optical fiber 13 is slightly bent. Due to this deflection, the tip portion 13a is urged forward by the elasticity of the optical fiber 13, so that the tip portion 13a is abutted against the built-in optical fiber 6 with sufficient force.

DESCRIPTION OF SYMBOLS 1 ... Optical ferrule, 2 ... Connection mechanism, 6 ... Built-in optical fiber, 10 ... Connector main body, 13 ... Optical fiber, 13a ... Tip part, 14 ... Optical fiber cable , 14b ... side face, 14d ... upper face, 14e ... lower face, 23 ... bottom wall part, 24 ... side wall part, 26 ... top wall part, 27 ... insertion space, 31・ ・ ・ Side holding projection, 31a ・ ・ ・ Front side of side holding projection, 31b ・ ・ ・ Back side of side holding projection, 31c ・ ・ ・ Tip of side holding projection, 32 ・ ・ ・ Bottom holding projection, 33 ・ ・ ・Top surface holding projection, A1 ... An angle formed by the front surface and the rear surface of the side surface holding projection, A2 ... An angle formed by both side surfaces of the top surface holding projection, H1: Height of the optical fiber cable, H2 ... Height from the inner surface of the bottom wall portion of the bottom surface holding projection, L1... The distance from the side surface holding projection of the other side wall portion, L2 ... the maximum distance in the two cable insertion directions among the plurality of side surface holding projections, L3 ... the length in the extending direction of the tip portion of the side surface holding projection, L4: distance from the inner surface of the bottom wall portion of the top surface holding projection, W1: width of the optical fiber cable. 53 ... Optical fiber holder, 54 ... Retention cover (retention means), 50 ... Retention mechanism, 60 ... Optical connector.

Claims (10)

A connector main body having a connection mechanism for connecting an external optical fiber drawn out from an optical fiber cable having a substantially rectangular cross section to an internal optical fiber inserted and fixed to an optical ferrule, and a retention mechanism for holding the optical fiber cable to the connector main body A mechanism,
The drawing mechanism has an optical fiber holder that holds the optical fiber cable, and a drawing means that can hold the optical fiber holder to the connector body,
The optical fiber holder is capable of inserting the optical fiber cable into a space surrounded by a bottom wall portion and side wall portions and ceiling wall portions provided on both side edges thereof,
A side surface holding projection is formed on the inner surface of the side wall portion so as to extend in a direction intersecting the cable insertion direction and press and hold the side surface of the optical fiber cable.
On the inner surface of the top wall portion is formed a top surface holding projection that presses and holds the upper surface of the optical fiber cable in a substantially dotted shape,
On the inner surface of the bottom wall portion, there is a bottom surface holding projection having a height (H2) from the inner surface of the bottom wall portion of 0.05 mm to 0.2 mm that holds the lower surface of the optical fiber cable in a substantially dotted shape. The optical connector is characterized in that the bottom holding projection is formed in a conical shape, and is formed so that the entire circumference is surrounded by the bottom surface of the concave portion provided on the inner surface of the bottom wall portion. .   2. The optical connector according to claim 1, wherein the top surface holding protrusion is formed on a bottom surface of a concave portion provided on the inner surface of the top wall portion.   The optical connector according to claim 1, wherein the optical fiber holder is an integrally molded product made of a synthetic resin of polyoxymethylene or polypropylene. The distance (L1) between the side surface holding projection of one of the side wall portions and the side surface holding projection of the other side wall portion is equal to or greater than the maximum value -0.7 (mm) of the width W1 of the optical fiber cable, and the width W1. The optical connector according to claim 1, wherein the optical connector has a minimum value of −0.2 (mm) or less. The optical connector according to any one of claims 1 to 4, wherein an angle formed by the front surface and the rear surface of the side surface holding projection is 55 to 85 degrees. A plurality of the side surface holding projections are formed at intervals in the cable insertion direction,
6. The maximum distance (L2) in the cable insertion direction of two of the plurality of side surface holding projections formed on at least one side wall is 2.5 mm or more. The optical connector according to claim 1.   The length (L3) in the extending direction of the front end portion of the side surface holding projection is not less than a height H1-0.5 (mm) of the optical fiber cable. The optical connector according to any one of claims.   The distance (L4) between the inner surface of the bottom wall portion and the top surface holding projection is not less than the maximum value -0.5 (mm) of the height H1 of the optical fiber cable and the minimum value (mm) of the height H1. The optical connector according to claim 1, wherein the optical connector is:   The top surface holding protrusion is formed in a substantially conical shape or a substantially truncated cone shape, and an angle (A2) formed by both side surfaces in a cross section passing through the central axis is 45 to 75 degrees. The optical connector according to any one of 8. A connector main body having a connection mechanism for connecting an external optical fiber drawn out from an optical fiber cable having a substantially rectangular cross section to an internal optical fiber inserted and fixed to an optical ferrule, and a retention mechanism for holding the optical fiber cable to the connector main body Used to hold the optical fiber cable in an optical connector comprising a mechanism,
It can be retained on the connector main body by the retaining means constituting the retaining mechanism,
The optical fiber cable can be inserted into a space surrounded by a bottom wall portion and side wall portions and ceiling wall portions provided on both side edges thereof,
A side surface holding projection is formed on the inner surface of the side wall portion so as to extend in a direction intersecting the cable insertion direction and press and hold the side surface of the optical fiber cable.
On the inner surface of the top wall portion is formed a top surface holding projection that presses and holds the upper surface of the optical fiber cable in a substantially dotted shape,
On the inner surface of the bottom wall portion, there is a bottom surface holding projection having a height (H2) from the inner surface of the bottom wall portion of 0.05 mm to 0.2 mm that holds the lower surface of the optical fiber cable in a substantially dotted shape. The optical fiber is characterized in that the bottom surface holding projection has a conical shape and is formed so as to be surrounded by the bottom surface of the concave portion provided on the inner surface of the bottom wall portion. Holding body.

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