JP6466640B2 - LC type optical connector plug - Google Patents

Description

  The present invention relates to an LC-type optical connector plug with a locking lever used when connecting optical fibers, and more particularly to an LC-type optical connector plug with improved operability for mounting and removing from a small and high-density connector.

  Conventionally, as this type of LC-type optical connector plug, for example, as shown in Patent Document 1 which is a prior application by the present applicant, a boot formed by forming an annular groove or a ring-shaped protrusion-like fitting portion on the outer periphery, A clip body (LC frame) in which a plurality of boot insertion portions having ring-shaped protrusions or annular groove fitting portions on the inner periphery so as to be fitted to the fitted portions of the boots are arranged side by side. The clip body (LC frame) is formed of an elastic material, and a protruding plate (operation lever) protrudes obliquely from an outer surface extending over a plurality of boot insertion portions and engages with a mating connector. Latch pieces (locking levers) provided obliquely from the tip of each plug body (coupling sleeve) to the rear are engaged with the protruding plates (operating levers), respectively, so that the protruding plates (operating levers) Each latch piece (locking lever) can be displaced in a direction approaching the plug body (coupling sleeve) by pressing the bar toward the clip body (LC frame), and further, There has been proposed an optical connector connecting structure having a locking portion between a fitted portion and a fitting portion of a boot insertion portion of a clip body (LC frame).

  In the optical connector connecting structure shown in Patent Document 1, each plug body (coupling sleeve) always maintains a stable holding state by fitting and connecting each boot via a clip body (LC frame) with the above-described configuration. It is supposed to be possible. In particular, in an optical connector core wire that does not have a Kevlar, the product itself is downsized because there is no Kevlar. For this reason, it has been conventionally used only for a single core. According to the above, it is supposed that change to multi-center is possible.

By the way, including the case of patent document 1, conventionally, as shown in the conventional view of FIG . 11 and FIG. 12 , the inside of the plug main body (coupling sleeve) 100 into which the ferrule 200 is inserted is a substantially hexagonal fitting. 100A is formed, and a hexagonal flange-like engaging portion 200A provided on the front end side of the ferrule holder 200B that holds the rear portion of the ferrule 200 is fitted into the fitting portion 100A, so that the plug body (cup The ferrule 200 itself cannot rotate with respect to the ring sleeve 100.

Further, in the related art, as shown in the conventional view of FIG. 13 , a clip body (LC frame) 301 having a protruding plate (operation lever) 302 on one side is integrally formed with a stop ring 303. The (LC frame) 301 and the stop ring 303 cannot be rotated relative to each other.

  Furthermore, in the case of Patent Document 1, a fixing plate is formed on both upper surfaces of the boot insertion portion of the clip body (LC frame) by extending each tip side horizontally and assembled as an optical connector connection structure. At this time, the fixing plate is brought into contact with the horizontal upper surface of the square flange of the extender cap so that the movement (including rotation) of the clip body (LC frame), the extender cap and the boot is prevented. It is to be held in.

Japanese Patent No. 4833802

However, in the case of the conventional and the above-described Patent Document 1, the stop ring and the clip body (LC frame) are combined and fixed, and the stop ring has a non-rotating structure and at the same time is connected to the plug body (coupling sleeve). Since the ferrule itself cannot rotate, the alignment of the ferrule for reducing the eccentric error, that is, the correction of the optical axis shift of the ferrule is performed in advance at the time of combination. However , in general, the core of the optical fiber is slightly decentered in terms of accuracy during manufacturing. Therefore, when the core of the optical fiber axis of the optical connector plug and the core of the optical fiber axis of the other optical connector plug are abutted and connected in the optical adapter, the optical axis deviation (eccentricity) between both cores is Connection loss occurs.

  Conventionally, as a mechanism for correcting the optical axis misalignment of the ferrule after assembly, an optical connector plug provided with a positioning key for fixing the ferrule at the position when the ferrule is rotated to determine the position with the least connection loss is practical However, since stepless adjustment is impossible, precise correction to the optical axis shift is difficult.

  Therefore, the present invention has been devised in view of the conventional circumstances as described above. By rotating the stop ring together with the ferrule after assembly, the optical axis deviation of the ferrule is adjusted steplessly. It is an object of the present invention to provide an LC type optical connector plug that can be accurately corrected and can easily and surely fix a ferrule at the correction position without using a positioning key or the like.

In order to solve the above-described problems, in the present invention, a rectangular tube-shaped coupling sleeve provided with a locking lever obliquely from the tip to the rear so as to engage with the mating connector adapter,
A ferrule frame having a ferrule at the tip inserted into the coupling sleeve;
A spring mounted on the outer periphery of the rear end of the ferrule frame and biasing the ferrule forward in the coupling sleeve;
A stop ring that fits within the coupling sleeve to support the rear end of the spring;
A heat-shrinkable tube with a caulking ring at the tip so as to be fitted to the outer periphery of the rear end of the stop ring;
A boot fitted to the outer periphery of the stop ring and attached to the outer periphery of the heat shrink tube while sandwiching the outer sheath of the optical fiber cord between the heat shrink tube and the caulking ring;
An operating lever fitted between the boot and the stop ring and engaged with the locking lever protrudes obliquely forward from the outer surface, and the locking lever is pressed by pressing the operating lever. An LC frame that can be displaced in a direction approaching the coupling sleeve side;
LC type optical connector plug equipped with
A fitting portion between the coupling sleeve and the ferrule frame, a fitting portion between the coupling sleeve and the stop ring, and the fitting portion so that the ferrule frame and the stop ring inserted into the coupling sleeve are rotatable. A fitting portion between the stop ring and the LC frame is formed in a circular shape, and a locking claw projecting forward on the front end side of the stop ring is formed on the outer periphery on the front end side of the ferrule frame. The stop ring and the ferrule frame can be integrally rotated in the circular fitting portion by engaging with the locking groove, and the optical axis shift of the ferrule is adjusted steplessly. The spring is made to be fixed by a pressing force against the ferrule frame and the coupling sleeve, A convex portion having a rectangular tube shape is provided on the rear end opening side of the coupling sleeve, and a circular inner peripheral surface in which the stop ring is rotatably fitted inside the convex portion and an axial shift of the stop ring are prevented. And a projection in the shape of a square tube on the opening side of the front end of the LC frame so as to be fitted with the projection of the coupling sleeve. The frame is configured not to rotate.

The operation lever of the LC frame is held down with a fingertip and is pushed down to displace the locking lever in a direction approaching the coupling sleeve, and the engagement between the locking lever and the mating connector adapter is released. The LC type optical connector plug can be removed from the mating connector adapter.

  According to the present invention, by rotating the stop ring together with the ferrule after assembly, the optical axis shift of the ferrule can be adjusted steplessly and accurately corrected, and a positioning key or the like can be used. In addition, the ferrule can be fixed easily and reliably at the correction position.

That is, in the present invention, a rectangular cylindrical coupling sleeve provided with a locking lever obliquely from the tip to the rear so as to engage with the mating connector adapter;
A ferrule frame having a ferrule at the tip inserted into the coupling sleeve;
A spring mounted on the outer periphery of the rear end of the ferrule frame and biasing the ferrule forward in the coupling sleeve;
A stop ring that fits within the coupling sleeve to support the rear end of the spring;
A heat-shrinkable tube with a caulking ring at the tip so as to be fitted to the outer periphery of the rear end of the stop ring;
A boot fitted to the outer periphery of the stop ring and attached to the outer periphery of the heat shrink tube while sandwiching the outer sheath of the optical fiber cord between the heat shrink tube and the caulking ring;
An operating lever fitted between the boot and the stop ring and engaged with the locking lever protrudes obliquely forward from the outer surface, and the locking lever is pressed by pressing the operating lever. An LC frame that can be displaced in a direction approaching the coupling sleeve side;
LC type optical connector plug equipped with
A fitting portion between the coupling sleeve and the ferrule frame, a fitting portion between the coupling sleeve and the stop ring, and the fitting portion so that the ferrule frame and the stop ring inserted into the coupling sleeve are rotatable. A fitting portion between the stop ring and the LC frame is formed in a circular shape, and a locking claw projecting forward on the front end side of the stop ring is formed on the outer periphery on the front end side of the ferrule frame. The stop ring and the ferrule frame can be integrally rotated in the circular fitting portion by engaging with the locking groove, and the optical axis shift of the ferrule is adjusted steplessly. The spring is made to be fixed by a pressing force against the ferrule frame and the coupling sleeve, A convex portion having a rectangular tube shape is provided on the rear end opening side of the coupling sleeve, and a circular inner peripheral surface in which the stop ring is rotatably fitted inside the convex portion and an axial shift of the stop ring are prevented. And a projection in the shape of a square tube on the opening side of the front end of the LC frame so as to be fitted with the projection of the coupling sleeve. Since the frame does not rotate, for the coupling sleeve in the LC type optical connector plug structure with the LC frame, the eccentricity error is adjusted steplessly by rotating the ferrule, that is, the optical fiber core wire in the circumferential direction. By being able to be fixed, the eccentric error can be reduced as much as possible, and the connection loss at the time of matching between both cores can be greatly reduced. Even after the LC type optical connector plug is assembled, the stop ring is rotated in the circumferential direction together with the spring, boot, etc. with respect to the coupling sleeve and the LC frame, so that the ferrule, that is, the optical fiber is rotated at the same position without moving back and forth. The eccentric error of both cores can be adjusted easily and reliably, and the connection loss at the time of matching between both cores can be greatly reduced.

  That is, a convex portion having a rectangular tube shape is provided on the rear end opening side of the coupling sleeve, and a circular inner peripheral surface in which the stop ring is rotatably fitted inside the convex portion and a shift in the axial direction of the stop ring. By providing the locking projections for preventing, it is possible to prevent the displacement in the axial direction from each other when fitting with the stop ring.

  Furthermore, the LC frame is prevented from rotating at the time of fitting with the coupling sleeve by forming a square tube-like convex portion on the front end opening side of the LC frame so as to be fitted to the convex portion of the coupling sleeve. Therefore, it is possible to prevent the adjustment position from being displaced due to inadvertent rotation of the LC frame after adjusting the eccentric error of both cores.

The operation lever of the LC frame is held down with a fingertip and is pushed down to displace the locking lever in a direction approaching the coupling sleeve, and the engagement between the locking lever and the mating connector adapter is released. Since the LC-type optical connector plug can be removed from the mating connector adapter, the optical axis shift is not caused when the LC-type optical connector plug is detached from the mating connector adapter by operating the operation lever. This connector system can be easily constructed.

1 is an exploded perspective view of an optical fiber cord type LC optical connector plug showing an embodiment for carrying out the present invention. It is an exploded sectional view of an LC type optical connector plug of the same optical fiber cord type. It is a perspective view after the assembly of the LC type optical connector plug of the same optical fiber cord type. It is a side view after the assembly of the same optical fiber cord type LC type optical connector plug. It is the longitudinal cross-sectional view after the assembly of the same optical fiber cord type LC type optical connector plug. An example of a coupling sleeve is shown, (a) is a side view, (b) is a front view, (c) is a rear view, and (d) is an XX sectional view of (b). An example of a ferrule (ferrule frame) is shown, (a) is a side view partially showing a cross section, (b) is a front view, (c) is a rear view, and (d) is a plan view. Similarly, an example of the LC frame is shown, (a) is a side view, (b) is a front view, (c) is a rear view, and (d) is a plan view. Similarly, an example of a stop ring is shown, (a) is a plan view, (b) is a front view, and (c) is a ZZ cross-sectional view of (a). (A), (b) is sectional drawing explaining the insertion operation procedure with respect to the other party connector adapter of LC type optical connector plug of an optical fiber cord type. Similarly, (c) and (d) are cross-sectional views for explaining an insertion / extraction operation procedure with respect to the mating connector adapter of the optical fiber cord type LC type optical connector plug. Similarly, (e) is a cross-sectional view for explaining the removal of the optical fiber cord type LC type optical connector plug from the mating connector adapter. The coupling sleeve in a prior art example is shown, (a) is a side view, (b) is a front view, (c) is a rear view, (d) is AA sectional drawing of (c). The ferrule (ferrule frame) in a prior art example is shown, (a) is a side view, (b) is a front view, and (c) is a BB sectional view of (a). The LC frame in a prior art example is shown, (a) is a side view, (b) is a front view, (c) is a rear view, and (d) is a plan view.

  The best mode for carrying out the LC type optical connector plug according to the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1, 2, 3, 4, and 5, the optical fiber cord K type LC-type optical connector plug P according to this embodiment includes a coupling sleeve 1 and a ferrule 2a at the tip. A ferrule frame 2, a ferrule tube 3 fitted to the outer periphery of the rear end portion of the ferrule frame 2, and a coiled spring 4 attached via the ferrule tube 3 are incorporated, and a stop ring fitted to the ferrule frame 2 A boot 6 is attached to the rear via 5.

As shown in FIGS. 2, 5, 6, and 10, the coupling sleeve 1 has a rectangular tube shape having a locking lever 1a obliquely from the front to the rear so as to engage with the mating connector adapter Q. It has a pair of front and rear circular inner peripheral surfaces 7b and 8b, which will be described later. Further, on the rear end opening side of the coupling sleeve 1, a rectangular tube-shaped convex portion 1 d is extended. In addition, a slit groove that facilitates insertion of the stop ring 5 at the rear end opening side of the coupling sleeve 1 when the stop ring 5 is inserted, thereby making it easy to insert the stop ring 5 and also serving as an adhesive fixing function. 11a and 11b are formed. In the illustrated example, two slit grooves 11a and 11b are provided at vertically symmetrical portions of the coupling sleeve 1, but the positions and the number thereof are not limited thereto. Further, a locking projection 10 for preventing the axial stop of the rotatable stop ring 5 is provided on one side of the inner surface of the prismatic convex portion 1d on the rear end opening side of the coupling sleeve 1. . The details of the locking projection 10 will be described later.

When the LC type optical connector plug P is attached to the mating connector adapter Q, the latching lever 1a and the mating connector adapter together with the latching pieces 1c provided at the left and right symmetrical positions provided at the root portion of the latching lever 1a It is pressed by the guide G of the plug insertion hole of Q, is mounted while being displaced downward together with the locking piece 1c, and the tip of the ferrule 2a is fitted to the sleeve holder S of the mating connector adapter Q and at the same time the mating connector adapter Q The locking piece 1c and the mating connector adapter Q are engaged by elastically locking the locking piece 1c to a step L formed upward on the back side of the guide ( (See FIG. 10 showing the operation procedure when there is an LC frame 31 to be described later).

On the other hand, when the LC-type optical connector plug P is removed from the mating connector adapter Q, the release piece 1b provided at the rear end of the latch lever 1a is held down with a fingertip to push down the latch piece 1c and the counterpart The engagement of the connector adapter Q is released, and the LC type optical connector plug P can be removed from the mating connector adapter Q (see FIG. 10 showing the operation procedure when there is an LC frame 31 described later).

As shown in FIGS. 1 and 7, the ferrule frame 2 has a small-diameter holder portion 2e protruding from the rear portion of the enlarged portion 2d, and a large-diameter circular projection 7a is formed on the distal end side of the enlarged portion 2d. The circular protrusion 7a is in sliding contact with the circular inner peripheral surface 7b of the coupling sleeve 1. In addition, the inner surface for engaging the engaging claws 5a and 5b projecting in a pair of upper and lower sides toward the front end side of the stop ring 5 is flat at a vertically symmetrical portion on the outer periphery of the circular protrusion 7a. Locking grooves 2b and 2c are formed. In addition, a ferrule 2a into which an optical fiber core wire is inserted is fitted at the center of the front end surface of the circular protrusion 7a of the ferrule frame 2.

As shown in FIGS. 1 and 9, the stop ring 5 has a pair of upper and lower engaging claws 5 a and 5 b projecting forward from the front end side thereof, and the circular shape of the ferrule frame 2 as described above. Both the ferrule frame 2 and the stop ring 5 can rotate together by engaging with the locking grooves 2b and 2c formed in the vertically symmetrical portion on the outer periphery of the protrusion 7a. Further, a convex portion 1d having a rectangular tube shape is provided on the rear end opening side of the coupling sleeve 1, and each of the circular inner peripheral surface 8b inside the convex portion 1d is provided in the front and rear in a substantially central portion of the stop ring 5. The circular protrusion 8a is rotatably fitted. The locking protrusion 10 of the coupling sleeve 1 engages with the circular protrusion 8a to prevent the axial rotation of the rotatable stop ring 5. A boot 6 is attached to the rear end side of the stop ring 5. The spring 4 urges the ferrule 2 a forward in the coupling sleeve 1, and the stop ring 5 supports the rear end of the spring 4.

As described above, the circular protrusion 7a on the front end side of the ferrule frame 2 and the circular protrusion 8a of the stop ring 5 are in sliding contact with the pair of front and rear circular inner peripheral surfaces 7b, 8b of the coupling sleeve 1. That is, when the circular protrusion 7a is in sliding contact with the circular inner peripheral surface 7b, a coupling portion is formed in which the coupling sleeve 1 and the ferrule frame 2 can rotate relative to each other, and the circular protrusion 8a is formed on the circular inner peripheral surface. By fitting in sliding contact with 8b, a fitting portion is formed in which the coupling sleeve 1 and the stop ring 5 can rotate relative to each other.

As shown in FIGS. 1, 2, 3, 4, and 5 , a heat shrinkable tube 22 having a caulking ring 21 at the tip is fitted to the outer periphery of the rear end of the stop ring 5, A boot 6 is attached to the outer periphery of the heat shrinkable tube 2 while sandwiching an unshown outer sheath of the optical fiber cord K between the heat shrinkable tube 22 and the caulking ring 21. At this time, an LC frame 31 for operating the locking lever 1a is provided between the boot 6 and the coupling sleeve 1 (stop ring 5 built in the coupling sleeve 1). The LC frame 31 has an operating lever 32 that is engaged with the release piece 1b of the locking lever 1a protruding obliquely forward from the outer surface, and pressing the operating lever 32 causes the coupling sleeve 1 to The locking lever 1a can be displaced in a direction approaching the coupling sleeve 1 side.

As shown in FIGS. 2 and 8 , the optical fiber cord K type LC frame 31 has a rectangular tube shape on the front end opening side of the LC frame 31 in order to fit the convex portion 1d of the coupling sleeve 1 inside. After the projection 33 is formed and the coupling sleeve 1 is fitted, the LC frame 31 is prevented from rotating with respect to the coupling sleeve 1. That is, the LC frame 31 and the coupling sleeve 1 are connected by fitting the convex portion 1 d of the coupling sleeve 1 inside the tip end portion of the convex portion 33 of the LC frame 31. In addition, as shown in FIG. 8 , a circular inner peripheral surface 8d having a large inner diameter is provided on the inner periphery of the LC frame 31 closer to the convex portion 33, and on the inner periphery of the LC frame 31 closer to the operation lever 32. A circular inner peripheral surface 9a having a small inner diameter is provided. Further , in the vertically symmetrical portion of the convex portion 33 on the front end opening side of the LC frame 31 shown in FIG. 8, to face the slit grooves 11 a and 11 b in the vertically symmetrical portion on the rear end opening side of the coupling sleeve 1, Slit grooves 34a and 34b are formed.

Stop ring 5 of the optical fiber cord K type, as shown in FIG. 9, in addition to the previous SL circular projection 8a, the circular protrusion 8c is provided on its rear side, additionally to the rear side, the rear circumferential surface An annular concavo-convex portion 5c for mounting the caulking ring 21 is provided through 9b.

  The circular protrusion 8 c of the stop ring 5 described above is slidably contacted with the circular inner peripheral surface 8 d near the convex portion 33 of the LC frame 31, and the rear peripheral surface 9 b of the stop ring 5 is operated on the LC frame 31. By slidingly contacting the circular inner peripheral surface 9 a near the lever 32, a fitting portion is configured in which the LC frame 31 and the stop ring 5 can rotate relative to each other.

Next, an example of assembly for the configuration configured as described above will be described .

  First, the ferrule tube 3 is fitted to the holder 2e at the rear end of the ferrule frame 2 provided with the ferrule 2a at the tip, and the spring 4 is externally attached to the enlarged portion 2d of the ferrule frame 2 through the ferrule tube 3. Keep it. Then, the ferrule frame 2 is inserted into the coupling sleeve 1.

  On the other hand, a caulking ring 21 at the tip of the heat shrink tube 22 is fitted to the outer periphery of the rear end portion of the stop ring 5, and an unshown outer sheath of the optical fiber cord K is sandwiched between the heat shrink tube 22 and the caulking ring 21. While doing so, the heat shrinkable tube 2 is heated and shrunk to adhere to the optical fiber cord K. Then, the boot 6 is fitted from the outer periphery of the heat shrinkable tube 2 through the annular uneven portion 5c on the rear end side of the stop ring 5.

  Next, the LC frame 31 and the coupling sleeve 1 are coupled by fitting the convex portion 1 d of the coupling sleeve 1 into the inner end of the convex portion 33 of the LC frame 31. Then, the front portion of the stop ring 5 is pushed into the coupling sleeve 1 from the rear end opening, and the locking claws 5a projecting from the locking groove 2b, 2c of the ferrule frame 2 at the tip of the stop ring 5; Assembling is completed by fitting 5b.

  Thus, the circular protrusion 7a of the ferrule frame 2 is in sliding contact with the circular inner peripheral surface 7b of the coupling sleeve 1, so that the coupling sleeve 1 and the ferrule frame 2 can be rotated relative to each other, and the stop ring 5 The circular protrusion 8 a is on the circular inner peripheral surface 8 b of the coupling sleeve 1, the circular protrusion 8 c of the stop ring 5 is on the circular protrusion 8 d of the LC frame 31, and the rear peripheral surface 9 b of the stop ring 5 is on the LC frame 31. The sliding sleeve 1, the stop ring 5 and the ferrule frame 2 can be rotated relative to each other by being in sliding contact with the circular inner peripheral surface 9 a near the operating lever 32.

  Even after the assembly, the coupling sleeve 1, the stop ring 5 and the ferrule frame 2 can rotate in the axial direction, and the rotation of the stop ring 5 causes the ferrule 2a to rotate in the axial direction. Can rotate. At this time, the ferrule frame 2 (ferrule 2a), the coil spring 4, the stop ring 5 and the boot 6 are integrally rotated 360 degrees.

  Then, after the stepless adjustment of the optical axis deviation of the ferrule 2a using these rotating members, the adjustment position is fixed by the pressing force of the spring 4 against the ferrule frame 2 and the coupling sleeve 1. However, since the optimum position is moved by the pressing force of the spring 4 only when the boot 6 is rotated after assembly, the slit grooves 11a and 11b (FIG. 6) are interposed between the stop ring 5 and the coupling sleeve 1. The adhesive (not shown) is filled and fixed through (see).

  In the above-described stepless adjustment, the coupling sleeve 1 may be fixed and the stop ring 5 may be rotated as described above, but the stop ring 5 may be fixed and the coupling sleeve 1 may be rotated. In the former case, the ferrule 2a always rotates at the same position by the action of the spring 4, does not move in the front-rear direction, and the pressing force is equal without being strong or weak. Therefore, when the pair of LC type optical connector plugs P are connected to each other via the LC type optical connector adapter Q, the ferrules 2a can always be abutted with a uniform pressure.

Next, the insertion and removal operation procedures for the mating connector adapter Q of the optical fiber cord K type LC optical connector plug P.

As shown in FIG. 10.1 (a) and FIG. 10.1 (b), when mounted to the arrow Direction to the mating connector adapter Q of the LC-type optical connector plug P, the locking lever 1a is the The locking lever 1a is pressed by the guide G of the plug insertion hole of the mating connector adapter Q together with the locking piece 1c, and is mounted while being displaced downward together with the locking piece 1c. At this time, the release piece 1 b of the locking lever 1 a is separated from the operation lever 32.

As shown in FIG. 10.2 (c), the step L formed on the back side of the guide of the mating connector adapter Q at the same time the tip of the ferrule 2a is fitted into the sleeve holder S of the mating connector adapter Q. When the locking piece 1c is elastically locked, the locking piece 1c and the mating connector adapter Q are engaged. At this time, the release piece 1b of the locking lever 1a contacts the operation lever 32.

On the other hand, during pulling out from the mating connector adapter Q of the LC-type optical connector plug P, as shown in FIG. 10.2 (d), by pressing down with the operation lever 32 with the fingertips to the arrow Direction, engaging When the release piece 1b of the stop lever 1a is pushed down, the engagement between the locking piece 1c and the mating connector adapter Q is released, and as shown in FIG. 10.3 (e), the LC type light from the mating connector adapter Q The connector plug P can be removed.

Thus, in the present embodiment, the optical axis deviation of the ferrule 2a is continuously stepped by rotating the stop ring 5 together with the ferrule 2a after the assembly of the optical fiber cord K type LC optical connector plug P. Adjustment and precise correction can be performed, and the ferrule 2a can be fixed easily and reliably at the correction position without using a positioning key or the like.

  Further, in the present embodiment, the locking protrusions 10 provided on one side of the inner surface of the coupling sleeve 1 can prevent misalignment in the axial direction with each other when fitting with the stop ring 5.

  Further, in the present embodiment, the rectangular tubular convex portion 33 of the LC frame 31 does not rotate the LC frame 31 when fitted to the coupling sleeve 1, so that the LC frame 31 after adjusting the eccentric error of both cores. It is possible to prevent the adjustment position from being displaced by inadvertent rotation.

P LC type optical connector plug Q Opposite side optical connector adapter K Optical fiber cord S Sleeve holder G Guide L Step 1 Coupling sleeve 1a Locking lever 1b Release piece 1c Locking piece 1d Protruding part 2 Ferrule frame 2a Ferrule 2b, 2c Stop groove 2d Enlarged portion 2e Holder portion 3 Ferrule tube 4 Spring 5 Stop ring 5a, 5b Locking claw 5c Annular uneven portion 6 Boots 7a, 8a, 8c Circular protrusion (fitting portion)
7b, 8b, 8d, 9a Circular inner peripheral surface (fitting part)
9b Rear circumferential surface (fitting part)
10 Locking projections 11a and 11b Slit groove 21 Caulking ring 22 Heat shrinkable tube 31 LC frame 32 Operation lever 33 Convex parts 34a and 34b Slit groove 100 Plug body (coupling sleeve)
100A Fitting part 200 Ferrule 200A Engaging part 200B Ferrule holder 301 Clip body (LC frame)
302 Protruding plate (operating lever)
303 Stop ring (LC stop ring)

Claims (2)

A rectangular tubular coupling sleeve provided with a locking lever obliquely from the tip to the rear so as to engage with the mating connector adapter;
A ferrule frame having a ferrule at the tip inserted into the coupling sleeve;
A spring mounted on the outer periphery of the rear end of the ferrule frame and biasing the ferrule forward in the coupling sleeve;
A stop ring that fits within the coupling sleeve to support the rear end of the spring;
A heat-shrinkable tube with a caulking ring at the tip so as to be fitted to the outer periphery of the rear end of the stop ring;
A boot fitted to the outer periphery of the stop ring and attached to the outer periphery of the heat shrink tube while sandwiching the outer sheath of the optical fiber cord between the heat shrink tube and the caulking ring;
An operating lever fitted between the boot and the stop ring and engaged with the locking lever protrudes obliquely forward from the outer surface, and the locking lever is pressed by pressing the operating lever. An LC frame that can be displaced in a direction approaching the coupling sleeve side;
LC type optical connector plug equipped with
A fitting portion between the coupling sleeve and the ferrule frame, a fitting portion between the coupling sleeve and the stop ring, and the fitting portion so that the ferrule frame and the stop ring inserted into the coupling sleeve are rotatable. A fitting portion between the stop ring and the LC frame is formed in a circular shape, and a locking claw projecting forward on the front end side of the stop ring is formed on the outer periphery on the front end side of the ferrule frame. The stop ring and the ferrule frame can be integrally rotated in the circular fitting portion by engaging with the locking groove, and the optical axis shift of the ferrule is adjusted steplessly. The spring is made to be fixed by a pressing force against the ferrule frame and the coupling sleeve, A convex portion having a rectangular tube shape is provided on the rear end opening side of the coupling sleeve, and a circular inner peripheral surface in which the stop ring is rotatably fitted inside the convex portion and an axial shift of the stop ring are prevented. And a projection in the shape of a square tube on the opening side of the front end of the LC frame so as to be fitted with the projection of the coupling sleeve. An LC type optical connector plug, characterized in that the frame does not rotate. The operation lever of the LC frame is held down with a fingertip and is pushed down to displace the locking lever in a direction approaching the coupling sleeve, and the engagement between the locking lever and the mating connector adapter is released. The LC type optical connector plug according to claim 1 , wherein the LC type optical connector plug can be removed from the mating connector adapter.

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