JP2019095498A - Caps for optical adapter and manufacturing equipment for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly attach and detach a cap even if an optical adapter has a latch lever piece, and at the same time, it has an excellent dustproof function and is easy and accurate to manufacture with a separation mold (improvement of the mold removal function). ), And a cap for an optical adapter and a manufacturing apparatus thereof. SOLUTION: A tip of a flexible latch lever piece 21 for locking an optical connector plug formed to face the inside of an optical adapter 20 at a symmetrical position in a connecting portion between a cylinder body portion 1 and a flange portion 2 of a cap K. A hook-shaped claw portion 21a formed at the tip of the latch lever piece 21 is hooked at a symmetrical position on the outer wall of the cylinder body portion 1 so as to form a recess 4 into which each of the latch lever pieces 21 is inserted. A portion 5 is formed, and an outward tapered surface portion 4a is formed on the outer inner wall of the recess 4 so as to face the hook portion 5. [Selection diagram] Fig. 1

Description

  The present invention has a dustproof function to prevent intrusion of dust or the like from the opening of the optical adapter when the optical adapter is not inserted and connected to the optical adapter (when the optical adapter is not used, etc.) and a locking portion in the optical adapter The present invention relates to a cap for an optical adapter having a protective function to prevent external damage, deformation, and the like, and a manufacturing apparatus therefor.

  Conventionally, as shown in FIG. 25 to FIG. 27 and FIG. 35 to FIG. 37, the optical adapter 20 has both ends of the optical adapter 20 so that the optical fiber ribbons of the ferrule of the MPO type connector plug can be interconnected. The optical axis is matched, and one of the insertion opening end and the other insertion opening end are respectively provided, and the inserted MPO type connector plug is engaged with the inside of each of the two insertion opening ends. A flexible latch lever piece 21 having hook-like claws 21a formed inward at the tip end is disposed opposite to each other for stopping.

  When an optical connector plug (not shown) is inserted and connected to the optical adapter 20 (when the optical adapter 20 is not used, etc.), the opening end of the optical adapter 20 is prevented from entering dust and the like. In order to prevent external damage, deformation, and the like to the dustproof function and the locking portion in the optical adapter 20, the optical adapter cap K is attached.

  Specifically, as shown in FIGS. 18 to 27, the optical adapter cap K includes a substantially rectangular cylinder body 1 inserted into one insertion opening end of the optical adapter 20, and the optical adapter 20. A horizontally long, substantially circular plate-like flange portion 2 connected to one end of the cylindrical body 1 so as to be locked to the opening edge of one of the insertion opening ends, and a knob connected to the outer surface of the flange portion 2 And 3 are provided.

  As shown in FIG. 18, FIG. 19, FIG. 21, FIG. 23, and FIG. 25 to FIG. 27, grooves 1a are formed along the longitudinal direction on the left and right outer wall surfaces of the cylinder body 1 and connected to the grooves 1a. In the left-right symmetrical position of the flange portion 2 to be formed, a notch 50 cut out in a substantially U-shaped concave shape in a front view is formed. In the groove 1a on the side closer to the dropout portion 50, hooks 5 for hooking hook-like hooks 21a formed inwardly toward each other are integrally formed at the tip of the latch lever piece 21. ing. The hooking portion 5 is formed into a substantially V-shaped cross section by a steep rear inclined surface 5a formed toward the cutout portion 50 and a gentle front inclined surface 5b formed toward the distal end side of the cylinder body 1. It is formed in the form of outward bulging.

  As shown in FIGS. 25 to 27, when the cap K is inserted into one insertion opening end of the optical adapter 20, the hook portion of the latch lever piece 21 is formed on the hook portion 5 formed in the groove portion 1a. 21a is suspended. At this time, the claws 21 a are fitted and held in the notches 50 provided in the flange 2.

  Further, as another example of the conventional optical adapter cap K, as shown in FIGS. 28, 31, and 33, the hook portion 5 is not formed in the groove portion 1a, and is formed in a straight groove. At the same time, there is also a case where a recessed portion 40 recessed in a substantially rectangular shape in a front view is formed at the left-right symmetric position of the flange portion 2 connected to the groove portion 1a.

  Similarly to the above, the cap K of this example is provided with the flange portion 2 at one end of the cylindrical body portion 1 so as to be locked to the opening edge of the optical adapter 20, and the outer surface of the flange portion 2 is provided with the knob 3 ing. Further, as shown in FIGS. 35 to 37, an outward taper surface portion 40 a is formed on the outer inner wall of the recess 40.

  When the cap K is inserted into one of the insertion opening ends of the optical adapter 20, the claw portion 21a of the latch lever piece 21 slides straight along the groove portion 1a and is fitted in the concave portion 40. It is locked.

  In the first cap K (see paragraph numbers “0004” to “0006”) and the second cap (see paragraph numbers “0007” to “0009”) described above, reference numeral 10 denotes a wide portion of the flange portion 2. It is a rectangular plate-like base (base of the knob 3).

nothing special

  However, since the outer wall of the flange portion 2 is notched and opened in the missing portion 50 mentioned as the structural example of the first conventional cap K described above, the latch lever piece 21 of the optical adapter 20 In this state, even if one opening end of the optical adapter 20 is closed with the cap K, no dustproof function is provided, and the light can be easily introduced into the optical adapter 20 from the outside. There is a defect that dust etc. invades.

  Further, the recess 40 recessed in a substantially rectangular shape in a front view, which is mentioned as a structural example of the second conventional cap K in the above-mentioned conventional, has a dustproof function contrary to the case of the missing part 50. However, since the hooking portion 5 for engaging the hook portion 21a of the latch lever piece 21 of the optical adapter 20 is not formed, the one opening end of the optical adapter 20 is closed with the cap K. However, there is a defect that it is easy to come off.

  On the other hand, in the manufacturing apparatus of the cap K for an optical adapter, the recess 40 and the like of the cap K are molded using a mold for injection molding which can be separated from each other, but the hook portion 21a of the latch lever piece 21 is engaged When forming the hooking portion 5 in the groove portion 1a, in order to avoid the collision with the hooking portion 5, it is necessary to slide and separate the pair of left and right molds diagonally downward instead of directly downward after molding. is there. However, since the concave portion 40 of the cap K is recessed in a substantially rectangular shape in a front view, there is no means other than separating the left and right molds right below, and therefore the outer wall of the concave portion 40 is made of gold. The pressure from the inside of the mold may cause breakage.

  Therefore, a cap K consisting of the above-described conventional flange portion 2 having a substantially rectangular recessed portion 40 in the front view and the hook portion 5 of the latch lever piece 21 is molded using a separation mold. Also, separation (displacement) of the mold after molding is almost impossible, and in that respect, improvement as a manufacturing apparatus for the cap K is required.

  Therefore, the present invention has been devised in view of the conventional circumstances such as the above, and even if the optical adapter is equipped with the latch lever piece, the cap can be smoothly "dropped out" and at the same time the dustproof It is an object of the present invention to provide a cap for an optical adapter which is excellent in function and can be easily manufactured by a separation mold (improvement of the mold release function) and a manufacturing apparatus therefor.

  In order to solve the problems described above, in the cap for an optical adapter according to the present invention, the cylindrical barrel inserted in the optical adapter and the cylindrical barrel so as to be locked to the opening edge of the optical adapter A flange portion connected to one end and a knob portion connected to the outer surface of the flange portion, which is formed opposite to the inside of the optical adapter at a symmetrical position at the connection portion between the cylinder body portion and the flange portion A recess is formed in which the tip of a bendable latch lever piece for locking the optical connector plug is inserted respectively, and the tip end of the latch lever piece is placed inside each other at a symmetrical position of the outer wall of the cylindrical body. A hooking portion for hooking the hook-like hook portion formed facing is formed, and an outward taper surface portion is formed on the outer inner wall of the recess to face the hooking portion.

  The latch lever piece is characterized in that the claw portion at the tip end of the latch lever piece can be removed by sliding in an oblique direction along the outer inner wall of the outwardly tapered surface portion of the recess.

  The width in the thickness direction of the inner bottom of the recess corresponds to the thickness of the latch lever piece of the optical adapter.

  The lateral width of the recess corresponds to the lateral width of the latch lever piece of the optical adapter.

  The hooking portion has an outwardly bulging shape with a generally U-shaped cross section by a steep rearward inclined surface facing the outward tapered surface portion of the recess and a gentle forward inclined surface formed toward the end of the cylinder body. And is formed.

  The knob portion is characterized in that it is formed into any of a trumpet shape, a skirt shape, a nozzle shape, a conical shape, or a rectangular cylindrical frame shape from the flange portion toward the outer side.

  On the other hand, in the manufacturing apparatus of the optical adapter cap according to the present invention, the cylindrical barrel inserted in the optical adapter and one end of the cylindrical barrel so as to be locked to the opening edge of the optical adapter An apparatus for manufacturing an optical adapter cap using a mold for injection molding for molding the flange section and the knob section continuously provided on the outer surface of the flange section; A cylinder body inner mold for molding the inside of the cylinder body, a knob inner mold for molding the inside of the knob, and a pair of separable left and right knobs and flanges for molding the knob and the outside of the flange An outer mold and a pair of left and right separable cylindrical body outer molds that mold the outside of the cylindrical body, and the tip of the cylindrical body outer mold is connected to the cylindrical body and the flange. Oppositely formed inside the optical adapter at symmetrical positions in the part A projecting mold is formed so as to form a recess into which the tip of a bendable latch lever piece for locking the optical connector plug is inserted, and the inside of the outer cylinder of the cylindrical barrel portion is the cylindrical barrel portion. The outer wall side of the projecting mold is provided with a curved recess so as to form a hooking portion for hooking hook-like hooks formed inward toward each other at the tip of the latch lever piece at symmetrical positions of the outer wall of Is characterized in that an inward tapered surface portion is formed toward the tip corresponding to the curved recess.

  The projection-like mold is formed at a symmetrical position of the tip of the cylindrical outer mold so as to correspond to a latch lever piece formed opposite to the inside of the optical adapter.

  According to the present invention, the optical adapter is excellent in dustproofing and protection functions, and the manufacture using a separate mold for injection molding can be performed easily and reliably (improvement of the “dropout” function of the mold).

  That is, the cap for an optical adapter according to the present invention includes a cylinder body inserted into the optical adapter, and a flange continuously connected to one end of the cylinder body so as to be engaged with the opening edge of the optical adapter. A bending portion for locking an optical connector plug formed opposite to the inside of the optical adapter at a symmetrical position in a connection portion between the cylinder body portion and the flange portion, including a knob portion continuously provided on the outer surface of the flange portion A recess is formed in which the free end of the latch lever piece is inserted, and a hook-shaped claw formed inward at each end of the latch lever piece at the left-right symmetric position of the outer wall of the cylinder body. Since a hooking portion for engaging the hooking portion is formed, and an outward taper surface portion is formed on the outer inner wall of the recess to face the hooking portion, separation of the cap from the optical adapter The operation is smooth And at the same time it can be carried out in, an excellent cap to the dust-proof function. In addition, when the lid of the optical adapter is closed, the claw portion at the tip of the latch lever piece is inserted into the recess and is not exposed, so that deformation and damage of the latch lever piece can be prevented in advance.

  The latch lever piece is characterized in that the claw portion at the tip of the latch lever piece can be pulled out by sliding in an oblique direction along the outer inner wall of the outwardly tapered surface portion of the recess, so that it can be removed from the optical adapter The cap's disengaging "disengagement" operation can be performed smoothly without damaging the outer wall of the recess. Therefore, at the time of cap molding using such a separation mold, the mold can be separated easily and reliably without breakage of the outer wall of the recess due to the pressing force from the inside of the mold.

  The width in the thickness direction of the inner bottom of the recess corresponds to the thickness of the latch lever piece of the optical adapter, so that the thickness direction of the recess of the optical adapter and the latch lever piece Since no gap is formed, the cap has an excellent dustproof function.

  Since the width of the recess corresponds to the width of the latch lever piece of the optical adapter, a gap in the width direction between the recess and the latch lever does not occur, so the dustproof function is excellent. It becomes a cap.

  The hooking portion has an outwardly bulging shape with a generally U-shaped cross section by a steep rearward inclined surface facing the outward tapered surface portion of the recess and a gentle forward inclined surface formed toward the end of the cylinder body. As a result, the hook portion of the tip of the latch lever is caught by the hooking part, so that it is difficult to come off. Incidentally, for example, in the structure in which it is stopped in the optical adapter due to the repulsive force of the resin spring, the holding power of the cap is weakened due to the deformation due to heat, but the structure of the present invention is less susceptible to environmental influences.

  The knob portion is characterized in that it is formed into any of a trumpet shape, a skirt shape, a nozzle shape, a conical shape, or a rectangular cylindrical frame shape from the flange portion toward the outside. The cap can be easily pulled out of the optical adapter.

  On the other hand, in the manufacturing apparatus of the optical adapter cap according to the present invention, the cylindrical barrel inserted in the optical adapter and one end of the cylindrical barrel so as to be locked to the opening edge of the optical adapter An apparatus for manufacturing an optical adapter cap using a mold for injection molding for molding the flange section and the knob section continuously provided on the outer surface of the flange section; A cylinder body inner mold for molding the inside of the cylinder body, a knob inner mold for molding the inside of the knob, and a pair of separable left and right knobs and flanges for molding the knob and the outside of the flange An outer mold and a pair of left and right separable cylindrical body outer molds that mold the outside of the cylindrical body, and the tip of the cylindrical body outer mold is connected to the cylindrical body and the flange. Oppositely formed inside the optical adapter at symmetrical positions in the part A projecting mold is formed so as to form a recess into which the tip of a bendable latch lever piece for locking the optical connector plug is inserted, and the inside of the outer cylinder of the cylindrical barrel portion is the cylindrical barrel portion. The outer wall side of the projecting mold is provided with a curved recess so as to form a hooking portion for hooking hook-like hooks formed inward toward each other at the tip of the latch lever piece at symmetrical positions of the outer wall of Is characterized in that an inward tapered surface portion is formed toward the tip corresponding to the curved concave portion, so that after the plastic (resin) is cooled and solidified in the separation mold, the outside of the pair of left and right cylinder barrels When the molds are separated, the mold after the molding is not broken by sliding the pair of left and right cylindrical body outer molds obliquely downward along the inward tapered surface parts, so that the mold can be easily and reliably obtained. It can be separated "pulled out".

  Since the projecting mold is formed at a symmetrical position of the end of the outer barrel of the cylindrical body so as to correspond to the latch lever piece formed opposite to the inside of the optical adapter, the cap is not When mounted on the open end of the optical connector, the claws of the latch lever piece can be inserted without any interference.

It is a perspective view of the cap for optical adapters which shows one form for implementing this invention. It is also a side view. It is also a plan view. It is also a front view. It is a rear view similarly. It is AA sectional drawing of FIG. It is a BB sectional view of FIG. It is sectional drawing (at the time of lid opening) before inserting a cap in an adapter. FIG. It is sectional drawing (at the time of lid closing) after similarly inserting. It is a plane sectional view at the time of shaping | molding of the cap for optical adapters by a metal mold | die. It is a plane sectional view at the time of mold release of a metallic mold. It is a perspective view which shows the modification in case the shapes of the knob of this invention differ. It is also a side view. It is also a plan view. It is also a front view. It is a rear view similarly. It is a perspective view of the cap for optical adapters in a prior art example. It is also a side view. It is also a plan view. It is also a front view. It is a rear view similarly. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is sectional drawing (at the time of opening) before inserting a cap in an optical adapter. FIG. It is sectional drawing (at the time of lid closing) after similarly inserting. FIG. 10 is a perspective view showing still another conventional example. It is also a side view. It is also a plan view. It is also a front view. It is a rear view similarly. It is EE sectional drawing of FIG. It is FF sectional drawing of FIG. It is sectional drawing (at the time of opening) before inserting the cap of a prior art example in the optical adapter. FIG. It is sectional drawing (at the time of lid closing) after similarly inserting.

  Hereinafter, an embodiment of an optical adapter cap K (hereinafter referred to as a cap K) according to the present invention will be described in detail with reference to the drawings.

  The cap K in the present embodiment is integrally molded by injecting, for example, a plasticized resin (resin) into a closed mold for injection molding described later (see FIGS. 11 and 12 described later). As shown in FIGS. 1 to 7, a substantially rectangular cylindrical body 1 inserted into the rectangular opening end of the optical adapter 20 and one end of the cylindrical body 1 so as to be locked to the opening edge of the optical adapter 20 A substantially horizontally long circular plate-like flange portion 2 connected in series, and a knob portion 3 continuously connected to the outer surface of the flange portion 2 in a trumpet shape, a skirt shape, a nozzle shape, or a conical shape. Is equipped.

  In the figure, reference numeral 10 denotes a wide rectangular plate-like base (base of the knob 3) of the flange 2 of the cap K, which substantially corresponds to the outer shape of the optical adapter 20. Further, in the figure, reference numeral 11 denotes a pair of front and rear guide projections provided along the width direction on the upper and lower surfaces of the cylindrical body 1 of the cap K, and the inner wall of the optical adapter 20 of the cylindrical body 1 The contact area is reduced to reduce the sliding friction, and when the cap K is closed, the holding function of the barrel 1 with respect to the optical adapter 20 is maintained.

  As shown in FIGS. 1, 4 and 6, on the left and right outer wall surfaces of the cylindrical body 1 of the cap K, grooves 1a are formed along the longitudinal direction, and the front surface of the flange 2 connected to the grooves 1a A concave portion 4 is formed in a substantially U-shape in a front view at symmetrical positions. The recess 4 is a flexible latch for locking the optical connector plug formed on the inside of the optical adapter 20 when the lid K is closed by the cap K on the insertion opening end side of the optical adapter 20 of the optical adapter 20. Each end of the lever piece 21 (a hook-like claw 21a described later) is inserted and inserted (see FIGS. 8 to 10).

  Further, as shown in FIGS. 1, 3, 4, 6, and 8 to 10, the groove 1a on the side closer to the recess 4 is formed inward at the tip of the latch lever piece 21. A hooking portion 5 for engaging the hook-like claw portion 21a is integrally formed. The hooking portion 5 is shaped like a letter having a substantially U-shaped cross section by a steep rear inclined surface 5a formed toward the concave portion 4 and a gentle front inclined surface 5b formed toward the tip end of the cylinder body 1. It is formed in the form of outward bulging.

  Furthermore, as shown in FIGS. 6 and 8 to 10, the outer inner wall of the recess 4 is formed as an outward taper surface portion 4a, and the surface thereof is the hook portion 5 formed in the groove portion 1a. It opposes the said back inclined surface 5a. As a result, the latch lever piece 21 can be removed by sliding the claw portion 21 a at the tip of the latch lever piece 21 obliquely outward along the outer inner wall of the outwardly tapered surface portion 4 a of the concave portion 4.

  The width in the thickness direction of the inner bottom of the recess 4 corresponds to the thickness of the latch lever 21 of the optical adapter 20, and the width of the recess 4 is the width of the latch lever 21 of the optical adapter 20. Respectively (see FIG. 10). Thereby, when the lid K is closed by the cap K on the insertion opening end side of the optical connector plug of the optical adapter 20, no gap is generated between the latch lever piece 21 and the flange portion 2; 20 A dustproof function to prevent the intrusion of dust etc. into the inside is exhibited.

  Next, an example of use of the embodiment configured as described above will be described.

  As a specific configuration of the optical adapter 20 described above, as shown in FIGS. 8 to 10, both ends of the optical adapter 20 are connected so that the optical fiber ribbons of the ferrule of the MPO type connector plug can be interconnected. With the optical axis aligned, one insertion opening end and the other insertion opening end are respectively provided, and the inserted MPO type connector plug is locked inside each of the two insertion opening ends. For this purpose, flexible latch lever pieces 21 having hook-like claws 21a formed inward at the tip end are disposed to face each other.

  As shown in FIG. 8, from the state (when opening the lid) before inserting the above-mentioned cap K into one of the opening ends for insertion of the optical adapter 20, as shown in FIG. The claw portion 21a at the tip of the latch lever piece 21 slides along the outer wall of the cylindrical body 1 of the cap K, and the gentle forward inclination of the hook 5 formed on the outer side of the cylindrical body 1 The hook portion 21a of the latch lever piece 21 is outwardly tapered surface portion 4a, as shown in FIG. 10, at the same time as being mounted on the steep rear inclined surface 5a by the elastic force of the latch lever piece 21 itself. By sliding obliquely inward along the outer inner wall of the connector, one of the open ends of the optical adapter 20 is closed by fitting in the recess 4.

  When the cap K is pulled out from one of the insertion opening ends of the optical adapter 20, when the cap K is forcibly pulled out, the claw portion 21a of the tip of the latch lever piece 21 of the optical adapter 20 tapers outward of the recess 4 The cap K is easily pulled out by sliding in the diagonally outward direction along the outer inner wall of the surface portion 4a and at the same time, the claw portion 21a runs on the steep rear inclined surface 5a.

  Next, an apparatus for manufacturing the cap K using a mold for injection molding will be described.

  This mold is, as shown in FIGS. 11 and 12, a cylinder barrel inner mold 13 b for molding the inside of the cylinder barrel 1 positioned on the front side of the cap K, and the rear side of the cap K An inner mold 13a for molding the inside of the knob 3, a pair of separable left and right knobs and flanges 12 for molding the outside of the knob 3 and the flange 2, and a cylinder of the cap K A pair of left and right separable cylindrical barrel outer molds 14 for molding the outside of the part 1 are provided.

  Further, a projecting mold 15 is integrally formed at the tip of the cylinder barrel outer mold 14 described above, and a curved recess 16 is provided inside the cylinder barrel outer mold 14.

  First, as shown in FIG. 11, a pair of upper and lower cylindrical body inner molds 13b, a pinched part inner mold 13a, a pair of left and right knobs and flanges outer molds 12, and a pair of left and right cylindrical body outer molds 14 Keep closed in a separated state, and inject high temperature heat plasticized plastic (resin) into the cavity of this closed mold. After the plastic (resin) is cooled and solidified in the mold, the mold is separated.

  When these molds are separated, as shown in FIG. 12, the outer wall side of the projecting mold 15 is formed as an inward tapered surface portion 15a corresponding to the curved concave portion 16 toward the tip, By sliding the left and right pair of cylinder barrel outer molds 14 obliquely (in the direction of the arrow), it is easily released.

  As a result, a bendable latch lever piece 21 for locking the optical connector plug formed opposite to the inside of the optical adapter 20 at a symmetrical position in the left-right symmetrical position in the connection portion between the cylinder body 1 and the flange 2 of the cap K The recessed part 4 which inserts each front-end | tip of each is shape | molded. At the same time, an outward taper surface 4 a is formed on the outer inner wall of the recess 4 by the inward taper surface 15 a of the projecting mold 15. Further, at the left and right symmetrical positions of the outer wall of the cylindrical body portion 1 of the cap K, hook portions 5 for hooking hook-like claw portions 21a formed inward toward each other at the tip of the latch lever piece 21 are integrated. It is formed.

  Next, a modification in the case where the shape of the knob of the cap K in this embodiment is different will be described. In addition, the detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol to the same part as the structure of above-described this embodiment. That is, in the present modification, as shown in FIGS. 13 to 17, the knob portion 30 of the cap K has a width from the base portion 10 of the flange portion 2 at the rear end of the barrel portion 1 of the cap K to the rear. It is continuously provided via the small-diameter rectangular connection part 30a, and the whole is formed in a substantially rectangular cylindrical frame shape.

  As described above, in the present embodiment and its modification, even if the optical adapter 20 has the latch lever piece 21 attached and removed, the cap K can be smoothly attached and removed, and the dustproof function is excellent. In addition, manufacturing using a separate mold for injection molding can be performed easily and accurately (improvement of mold removal function).

K cap 1 tube body 1a groove 2 flange 3 knob 4 recess 4a outward taper surface 5 hook 5a rear slope 5b front slope 10 base 11 guide protrusion 12 knob / flange outer mold 13a knob inside 13b cylinder body inner mold 14 cylinder body outer die 15 projecting mold 15a inward taper surface 16 curved concave 20 light adapter 21 latch lever 21a claw portion 30 knob 30a rectangular connecting portion 40a outward taper surface 50

Claims (8)

  A cylindrical body inserted into the optical adapter, a flange continuously connected to one end of the cylindrical body so as to be engaged with the opening edge of the optical adapter, and a knob continuously connected to the outer surface of the flange And, at a symmetrical position at the connection portion between the cylinder body portion and the flange portion, the tip end of a flexible latch lever piece for optical connector plug locking formed opposite to the inside of the optical adapter is inserted and inserted. A recessed portion is formed, and hooking portions for hooking hook-like claws formed inward toward each other are formed at the tip of the latch lever piece at symmetrical positions of the outer wall of the cylindrical body portion, and A cap for an optical adapter, wherein an outward taper surface portion is formed on the outer inner wall of the concave portion to face the hooking portion.   2. The light according to claim 1, wherein the latch lever piece is removable by sliding the claw portion at the tip of the latch lever piece obliquely along the outer inner wall of the outwardly tapered surface portion of the recess. Adapter cap.   3. The cap for an optical adapter according to claim 1, wherein the width in the thickness direction of the inner bottom of the recess corresponds to the thickness of the latch lever piece of the optical adapter.   The cap for an optical adapter according to any one of claims 1 to 3, wherein the width of the recess corresponds to the width of the latch lever piece of the optical adapter.   The hooking portion has an outwardly bulging shape with a generally U-shaped cross section by a steep rearward inclined surface facing the outward tapered surface portion of the recess and a gentle forward inclined surface formed toward the end of the cylinder body. The cap for an optical adapter according to claim 1, characterized in that   The knob portion is formed outward from the flange portion in a trumpet shape, a skirt shape, a nozzle shape, a conical shape, or a rectangular cylindrical frame shape. Optical adapter cap described.   A cylindrical body inserted into the optical adapter, a flange continuously provided at one end of the cylindrical body so as to be engaged with the opening edge of the optical adapter, and a knob provided continuously on the outer surface of the flange An apparatus for manufacturing an optical adapter cap using a mold for injection molding for forming the mold, wherein the mold is a cylinder barrel inner mold for molding the inside of the cylinder barrel, and the knob An inner mold for forming the inside of the knob, a pair of separable left and right knobs and flanges for molding the outside of the knob and the flange, and an outer mold for forming the outside of the cylinder body. An optical connector comprising: a pair of cylindrical barrel outer molds, wherein the tip of the cylindrical barrel outer mold is opposed to the inside of the optical adapter at a symmetrical position at the connecting portion between the cylindrical barrel and the flange portion Each end of a flexible latch lever piece for plug locking A projecting mold is formed to form a concave portion to be inserted, and is formed inside the cylindrical barrel outer mold at the symmetrical position of the outer wall of the cylindrical barrel at the tip of the latch lever toward each other inward. It has a curved recess to form a hook for engaging the hook-like claws, and the outer wall side of the projecting mold is formed with an inward tapered surface portion toward the tip corresponding to the curved recess. An optical adapter cap manufacturing apparatus characterized in that   8. The light according to claim 7, wherein the projecting mold is formed at a symmetrical position of the tip of the outer barrel part so as to correspond to a latch lever piece formed to face the inside of the optical adapter. Adapter cap manufacturing equipment.

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