JP2018151560A - Optical adaptor with shutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical adaptor with a shutter capable of reducing a radius in a rotational direction of two doors to shorten a depth dimension of a whole adaptor body, and obtaining strong coupling of the two doors with respect to a plug insertion port side.SOLUTION: An optical adaptor with a shutter is configured such that an adaptor body 1A having a laterally-long rectangular opening-shaped plug insertion port 2 into which a square housing-shaped optical connector plug is inserted is mounted with a shutter 3 for closing the plug insertion port 2 in a freely openable/closable manner, and that the shutter is energized in a closing direction by an elastic member 4. The shutter 3 is configured of two doors 3A, 3B vertically divided into two so as to be vertically arranged, which inwardly rotate when the shutter 3 is pushed in by the optical connector plug inserted into the plug insertion port 2.SELECTED DRAWING: Figure 1

Description

  The present invention is used to optically connect two optical fibers by having plug insertion openings of an optical connector plug such as an MPO type push-pull system at both ends. The shutter is opened by inserting the connector plug into one of the plug insertion openings, and is optically coupled with the optical fiber cable inserted into the other plug insertion opening. The present invention relates to an optical adapter with a shutter for an optical connector whose mouth is closed by a shutter.

  Conventionally, as shown in FIGS. 11 and 12, an MPO type optical connector adapter has optical connector plugs (not shown) at both ends of a horizontally long rectangular housing H having flanges F in the center of both left and right side surfaces. ) Is inserted in the plug insertion slot 100 with a key groove K, and the optical reference planes of the respective optical connector plugs inserted into the two plug insertion slots 100 are held in the fitting position so as to coincide with each other. The arm-shaped locking piece 101 is provided at a symmetrical position inside each plug insertion port 100.

  At this time, in a state where the optical connector plug is not inserted into one plug insertion slot 100, if an optical component related to the optical connector plug connected to the other plug insertion slot 100 is in an operating state, one plug is inserted. When a harmful laser beam (for example, 5 mW or more) is guided to the insertion slot 100 and the optical fiber connector is inserted into the plug insertion slot 100, the operator's body, in particular, the light from the optical cable is directly viewed. There was a risk of serious harm. In addition, there is a risk that the tip of the inserted optical cable (ferrule / optical fiber) may cause a problem due to the adhesion of dust.

  In order to avoid such danger, conventionally, as shown in Patent Document 1, when an optical connector plug is inserted into a plug insertion port of an optical connection component main body (adapter main body), two doors that rotate inwardly The two doors of the shutter are provided with a mask member provided with a lock arm that can be locked in a locking groove on the optical connection component main body (adapter main body) side. An optical connection component with a shutter is formed by covering the plug insertion port and engaging the convex portions provided at the upper and lower ends of the two doors with the concave portion formed on the plug insertion port side of the optical connection component body. is there.

Japanese Patent No. 3846595

  However, in the conventional double door shutter having a configuration in which two doors are horizontally disposed as shown in Patent Document 1, the plug insertion port of the adapter body has a horizontally long opening shape, and the optical connector is inserted into the plug insertion port. When the shutter is pushed in by the plug, each of the doors is divided into left and right doors that rotate inward and horizontally arranged, so that the radius of the rotation direction of the two doors is increased. As a result, there is a defect that the entire depth of the adapter main body becomes longer.

  In addition, since the mask member that covers the plug insertion port of the adapter main body is formed with a long lock arm for locking in the locking groove on the optical connection component main body (adapter main body) side, the configuration of the mask member There is a defect that the device itself becomes complicated, large and expensive.

  In addition, the convex portions provided at the upper and lower ends of the two doors are engaged with the concave portion of the front opening formed on the plug insertion port side of the adapter body, and held by the mask member that covers the plug insertion port. Therefore, there is a defect that the concave portion is easily detached from the convex portion, and the strong coupling to the plug insertion port side of the door cannot be obtained.

  Therefore, the present invention has been devised in view of the conventional circumstances as described above, and it is possible to reduce the overall depth dimension of the adapter body by reducing the radius of the rotation direction of the two doors. In addition, since there is no conventional lock arm, it is possible to form a cover on the plug insertion port side that is simpler, smaller, and lower in cost, and that the two doors are firmly connected to the plug insertion port side. An object of the present invention is to provide an optical adapter with a shutter that can be obtained and in which the optical reference plane of an optical connector plug is surely matched.

  In order to solve the above-described problems, in the present invention, an adapter body having a plug insertion port into which an optical connector plug is inserted is equipped with a shutter for closing the plug insertion port so as to be freely opened and closed, and an elastic member. An optical adapter with a shutter that is urged toward each other in a closing direction by the shutter so that the shutter rotates inward when the shutter is pushed in by an optical connector plug inserted into the plug insertion port. The adapter body is composed of two doors that are vertically divided into two, and the adapter body has left and right side walls extending forward from the plug insertion port, and each end of the left and right side walls. An outer housing formed with shaft holes at both upper and lower ends of the portion, and the upper and lower shaft holes facing each other on the left and right side wall portions at both ends of the upper door of the shutter. The formed projecting shafts are pivotally attached, while the projecting shafts formed at the left and right ends of the lower door of the shutter are pivotally attached to the lower shaft holes of the left and right side walls facing each other. To do.

  The two upper and lower doors of the shutter have a vertical width where the front ends of the doors are joined together in a substantially obtuse angle V shape toward the inside when they are rotated in the closing direction. It has a flat surface part which adheres.

  The adapter body includes a cover that is externally fitted to the outer housing so as to cover the shutter and the left and right side wall portions from the front side, and is rotated in a closing direction at the left and right facing positions of the front opening end of the cover. An opening edge for locking the two upper and lower doors that have moved is provided, and a substantially obtuse V-shaped depression is formed at each center of the opening edge.

  The cover has respective engagement hole portions formed on the upper wall surface and the lower wall surface thereof, and corresponding engagement projections are formed on the upper wall surface and the lower wall surface of the outer housing, respectively. At the time of external fitting to the outer housing, each locking projection is engaged with each engaging hole.

  The outer housing includes an internal holder that is inserted and inserted from the rear end side of the plug insertion opening, and is formed so that optical reference surfaces of plug bodies that are inserted from both end sides of the internal holder coincide with each other.

  The inner holder includes a plurality of guide grooves at the front ends of the outer upper wall surface and the outer lower wall surface, and a locking projection is engaged with and disengaged from the front grooves of the inner upper wall surface and the inner lower wall surface of the outer housing. It is formed to fit freely.

  Locking that functions as a stopper portion in the pushing direction of the internal holder when the locking protrusion inside the external housing is fitted to the rear end of the guide groove formed on the external upper wall surface and the external lower wall surface of the internal holder A receiving part is formed.

  A locking projection having a substantially right triangle shape in a side view is formed in front of the rear side of the guide groove formed on the outer upper wall surface and the outer lower wall surface of the inner holder, and the engagement inside the outer housing is formed on the rear surface of the locking projection. When the stop projection is fitted, a locking receiving portion that functions as a stopper in the pulling direction of the inner holder is formed.

  According to the present invention, the radius of the rotation direction of the two doors can be reduced to shorten the overall depth of the adapter body, and the simplification is achieved because there is no large lock arm as in the prior art. It is possible to form a small and low-cost cover on the plug insertion port side, and to obtain a strong connection to the plug insertion port side of the two doors and to ensure the optical reference surface of the optical connector plug. Can be matched.

  That is, in the present invention, an adapter body having a plug insertion slot into which an optical connector plug is inserted is equipped with a shutter for closing the plug insertion slot so as to be openable and closable, and urged toward each other by an elastic member in a closing direction. An optical adapter with a shutter, wherein the shutter is vertically divided into two parts vertically so as to rotate inward when the shutter is pushed in by an optical connector plug inserted into the plug insertion slot. The adapter body has left and right side walls extending forward from the plug insertion port, and shaft holes are provided at both upper and lower ends of each tip portion of the left and right side walls. A projecting shaft formed at both ends of the upper door of the shutter is pivotally attached to each of the upper shaft holes facing each other in the left and right side wall portions. On the other hand, projecting shafts formed at the left and right ends of the lower door of the shutter are pivotally attached to the lower shaft holes facing each other on the left and right side wall portions, so that the plug insertion openings of the upper and lower doors A strong bond to the side is obtained.

  The two upper and lower doors of the shutter have a vertical width where the front ends of the doors are joined together in a substantially obtuse angle V shape toward the inside when they are rotated in the closing direction. Since it has the flat part which closely_contact | adheres, the gap by the joining shift | offset | difference of the upper and lower doors, distortion of a front-end | tip part, etc. is not produced at the time of joining of the door front-end | tips.

  The adapter body includes a cover that is externally fitted to the outer housing so as to cover the shutter and the left and right side wall portions from the front side, and is rotated in a closing direction at the left and right facing positions of the front opening end of the cover. It has an opening edge for locking the two upper and lower doors that have moved, and is formed with a substantially obtuse V-shaped depression at the center of each opening edge. The picking area by the fingertip when removing the can be widened by the dent portion, and the operability is excellent.

  The cover has respective engagement hole portions formed on the upper wall surface and the lower wall surface thereof, and corresponding engagement projections are formed on the upper wall surface and the lower wall surface of the outer housing, respectively. At the time of external fitting to the outer housing, each locking projection is engaged with each engaging hole, so that the lock mechanism of the cover and the adapter main body can be simplified, reduced in size and reduced in cost. .

  The outer housing includes an inner holder that is inserted from the rear end side of the plug insertion opening, and is formed so that the optical reference planes of the plug bodies inserted from both end sides of the inner holder coincide with each other. The ferrules of the optical connector plug fitted from the opening portions at both ends of the inner holder can be held in contact with each other without being displaced.

  The inner holder includes a plurality of guide grooves at the front ends of the outer upper wall surface and the outer lower wall surface, and a locking projection is engaged with and disengaged from the front grooves of the inner upper wall surface and the inner lower wall surface of the outer housing. Since it forms so that it may fit freely, an internal holder can be assembled accurately and easily inside the external housing.

  Locking that functions as a stopper portion in the pushing direction of the internal holder when the locking protrusion inside the external housing is fitted to the rear end of the guide groove formed on the external upper wall surface and the external lower wall surface of the internal holder Since the receiving portion is formed, the inner holder can be accurately and easily assembled and fixed at a predetermined position inside the outer housing.

  A locking projection having a substantially right triangle shape in a side view is formed in front of the rear side of the guide groove formed on the outer upper wall surface and the outer lower wall surface of the inner holder, and the engagement inside the outer housing is formed on the rear surface of the locking projection. A locking receiving portion that functions as a stopper in the pulling direction of the internal holder is formed when the stop protrusion is fitted, and the internal holder is further accurately and easily assembled and fixed inside the external housing at a predetermined position. can do.

It is a disassembled perspective view of the adapter main body which shows one form for implementing this invention. It is a bottom perspective view of the inner housing of the adapter main body. It is a front view of the external housing of an adapter main body similarly. Similarly, it is a perspective view of the outer housing of the adapter main body in a horizontal half section. It is a perspective view which shows the state which similarly incorporated the internal holder in the external housing of the adapter main body. It is a perspective view which shows the state after the assembly of an adapter main body similarly. Similarly, it shows the state after assembly of the adapter body, (a) is a plan view, (b) is a side view, (c) is a bottom view, (d) is a front view, and (e) is a rear view. FIG. 5 also shows a cross-sectional state after assembly of the adapter main body, wherein (a) is a side cross-sectional view of the adapter main body corresponding to AA of the outer housing shown in FIG. 3, and (b) is B of the outer housing shown in FIG. FIG. 4C is a side sectional view of the adapter body corresponding to -B, and FIG. 4C is a side sectional view of the adapter body corresponding to CC of the outer housing shown in FIG. 3. The plug insertion sequence is shown, (a) is a sectional view in which a plug is inserted, and (b) is a sectional view after the plug is inserted. It is sectional drawing of the state which connected optical connector plugs with the adapter main body. It is a bottom perspective view of the housing of the MPO type optical adapter in the conventional example. Similarly, the housing of the MPO type optical adapter in the conventional example is shown, (a) is a plan view, (b) is a side view, (c) is a bottom view, (d) is a front view, and (e) is a rear view. .

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  In this embodiment, as shown in FIG. 10, an optical adapter with a shutter for an MPO optical connector for interconnecting a pair of opposing MPO optical connector plugs P (hereinafter abbreviated as a plug body P). (Hereinafter abbreviated as “adapter body 1”).

  As shown in FIG. 1, the adapter main body 1 includes a plug insertion port 2 having a horizontally long rectangular opening into which a rectangular housing-shaped MPO-type plug main body P is inserted, and closes the front end of the plug insertion port 2. A rectangular tube-shaped external housing 1A provided with a shutter 3 for opening and closing, and a horizontally long rectangular opening that is fitted to the external housing 1A so as to cover the plug insertion port 2 on the front end side together with the shutter 3. The cover 1B is generally composed of a flat cylindrical internal holder 1C which is inserted into the plug insertion port 2 on the rear end side of the external housing 1A.

  The shutter 3 is composed of two horizontally long rectangular plate-like doors 3A and 3B which are vertically arranged by vertically dividing a plate material having an area covering the front end of the horizontally long rectangular opening-shaped plug insertion port 2. When the two doors 3A and 3B are pushed in by the plug main body P inserted into the plug insertion port 2, each of the doors 3A and 3B is rotated inward. The radius in the rotational direction of 3B is formed to be small.

  That is, the outer housing 1A has left and right side wall portions 5 and 6 extending forward from the plug insertion port 2 on the front end side, and shaft holes are formed at upper and lower ends of the respective front end portions of the left and right side wall portions 5 and 6. 7A and 7B are drilled. Projecting shafts 8A formed at both ends of the upper door 3A of the shutter 3 are pivotally attached to the upper shaft holes 7A of the left and right side wall portions 5 and 6 facing each other, and the left and right side wall portions 5 and 6 are mutually connected. Projecting shafts 8B formed at both ends of the lower door 3B of the shutter 3 are pivotally attached to the opposed lower shaft holes 7B.

  The doors 3A and 3B are urged toward each other in a closing direction by an elastic member 4 such as a leaf spring. Specifically, as shown in FIGS. 8 and 9, rectangular openings 11A and 11B are formed at substantially the center where the doors 3A and 3B of the shutter 3 and the projecting shafts 8A and 8B are connected. The opening 11A, 11B is hooked with an elastic member 4 made of a metal leaf spring bent in a substantially L shape, and one end thereof is pressed against the inner surface (back surface) of the door 3A, 3B of the shutter 3. The other end is pressed against the inner surface of the cover 1B fitted to the outer housing 1A to urge the doors 3A and 3B of the shutter 3 in the closing direction. As a result, when the two doors 3A and 3B are pushed in by the plug body P, the doors 3A and 3B resist the urging force of the elastic member 4 so as to open the door toward the inside of the cover 1B. Rotate.

  The vertical widths of the upper and lower two doors 3A and 3B of the shutter 3 are such that when the doors are pivoted in the closing direction, the front ends of the doors are joined in a substantially obtuse angle V shape toward the inside. have. Such a substantially obtuse V-shaped joined state between the doors 3A and 3B is a substantially obtuse V-shaped recess 10A formed in an opening edge 10 of a cover 1B to be described later that locks the doors 3A and 3B. It corresponds to. Further, the doors 3A and 3B are formed with flat portions 9A and 9B for the respective front end portions to be in close contact with each other when they are rotated in the closing direction.

  That is, the cover 1B is externally fitted to the outer housing 1A so as to cover the shutter 3 and the left and right side wall portions 5 and 6 from the front side, and is located at the left and right facing positions of the front opening end of the cover 1B. In order to lock the two upper and lower doors 3A and 3B rotated in the closing direction so as to be in a substantially obtuse-angled V-shaped joined state, a substantially obtuse-angled V-shaped depression 10A is provided at each central front surface. An opening edge portion 10 is formed.

  At the center of the upper wall surface of the cover 1B and the left and right symmetrical positions of the lower wall surface, rectangular small hole-shaped engagement hole portions 12A are formed, and the upper surface of the external housing 1A is corresponding to these engagement hole portions 12A. Three locking projections 12B (one on the upper wall surface and two on the lower wall surface) having a substantially right triangular shape in side view are formed at the left and right symmetrical positions of the center of the wall surface and the lower wall surface, and the outer housing of the cover 1B. At the time of external fitting to 1A, each locking projection 12B is engaged with each engagement hole 12A.

  The inner holder 1 </ b> C is a direction in which the inner holder 1 </ b> C expands to hold both plug bodies P (not shown) in a fitting position where the optical reference planes of the plug bodies P inserted from both ends are aligned with each other. A locking arm 13 that can be freely bent is provided in a state in which each tip protrudes at a symmetrical position on the front and rear opening side.

  Further, the inner holder 1C is inserted into the inside from the rear end side of the plug insertion port 2 of the outer housing 1A with a direction determined. That is, as shown in FIG. 1, two short guide deep grooves 14 and long guide shallow grooves 15 are formed on both sides of the upper wall surface of the internal holder 1C so as to open to the front end of the internal holder 1C. Are formed in parallel.

  A locking receiving portion 14A is formed at the rear end of the short guide deep bottom groove 14 toward the front of the inner holder 1C.

  On the other hand, on the rear end and the front side of the long guide shallow groove 15, it is a rear side of the inner holder 1 </ b> C, that is, in a direction opposite to the locking receiving portion 14 </ b> A and functions as a stopper. A stopper portion 15A is formed.

  The locking receiving portion 14A is formed by a vertical wall surface portion 14B provided at the rear end of the guide deep bottom groove 14, and the locking receiving portion 15A is formed at the rear end of the guide shallow bottom groove 15. It is formed on the rear surface of the locking projection 15B provided slightly on the front side.

  That is, the locking protrusion 15B is formed in a substantially right triangle shape in side view, and includes a front tapered surface 15C, a central horizontal top surface portion 15D, and a rear vertical wall surface portion 15E. 15E functions as the above-described locking receiving portion 15A (stopper).

  Further, as shown in FIG. 2, a short guide deep bottom groove 16, a guide intermediate bottom groove 17, and a long guide shallow bottom are opened on the lower wall surface of the internal holder 1C so as to open to the front end of the internal holder 1C. A total of three grooves 18 are formed in parallel at equal intervals.

  The rear end of the short guide deep bottom groove 16 and the guide intermediate bottom groove 17 has a locking receiving portion 16A having the same form and function as the guide deep bottom groove 14 and the guide shallow bottom groove 15 on the upper wall side. , 17A are formed. On the other hand, a locking receiving portion 18A having the same form and the same function as the guide shallow groove 15 on the upper wall side is formed at the rear end and slightly front side of the long guide shallow groove 18.

  That is, behind the guide shallow groove 18, a locking projection 18B having a substantially right triangle shape in side view similar to the locking projection 15B on the upper wall side is provided, and the rear vertical wall surface portion 18C of the locking projection 18B is provided. Forms the locking receiving portion 18A.

  As shown in FIG. 4, a short guide deep bottom groove 16, a guide intermediate bottom groove 17 and a guide shallow groove provided on the lower wall surface of the inner holder 1C are provided in the front portion of the lower wall inside the outer housing 1A. Three locking projections 19 having different heights that are slidably fitted into the bottom groove 18 are formed in parallel at the same interval.

  In other words, the locking protrusion 19 includes locking protrusions 19A and 19B on the side that fits into the short guide deep bottom groove 16 and the guide intermediate bottom groove 17 provided on the lower wall surface of the inner holder 1C. In front of the lower wall portion in 1A, it is formed in a rectangular parallelepiped shape having the same height and the same length so as to fit these grooves 16 and 17. On the other hand, the locking protrusion 19C on the side that fits into the long guide shallow groove 18 is locked to the locking receiving portion 18A at the rear vertical surface 19D at the center of the lower wall portion in the outer housing 1A. As shown in FIG.

  Thus, the rectangular parallelepiped locking projections 19A and 19B of the outer housing 1A are used to lock the short guide deep bottom groove 16 and the guide intermediate bottom groove 17 of the inner holder 1C when the inner holder 1C is fitted. Locked to the receiving portions 16A and 17A. That is, the rear ends of the locking projections 19A and 19B function as stoppers in the pushing direction of the inner holder 1C.

  Further, the locking projection 19C having a substantially right triangle shape in a side view of the outer housing 1A is provided at the rear of the long guide shallow groove 18 of the inner holder 1C when the inner holder 1C is fitted. Locked to the receiving portion 18A. That is, the locking receiving portion 18A to which the locking protrusion 19C is locked functions as a stopper portion in the pulling direction of the internal holder 1C.

  Further, as shown in FIG. 4, the upper wall portion inside the outer housing 1A slides into a short guide deep bottom groove 14 and a long guide shallow bottom groove 15 provided on the upper wall surface of the internal holder 1C. Two locking projections 20 having different heights that can be freely fitted are formed at intervals.

  That is, the locking protrusion 20 is fitted to the groove 14 at the front of the lower wall portion in the outer housing 1A so that the locking protrusion 20A on the side that fits into the short guide deep bottom groove 14 of the inner holder 1C. Thus, it is formed in a rectangular parallelepiped shape having the same height and the same length. The locking projection 20A is formed in the same shape and size as the locking projection 19A provided on the lower wall portion in the outer housing 1A.

  When the inner holder 1C is fitted into the outer housing 1A, the locking protrusion 20A is locked to a locking receiving portion 14A provided at the rear of the guide deep bottom groove 14 of the inner holder 1C. That is, the locking receiving portion 14A to which the locking protrusion 20A is locked functions as a stopper portion in the pushing direction of the internal holder 1C.

  On the other hand, the locking projection 20 has a rear vertical surface 20C at the center of the upper wall portion in the outer housing 1A, where the locking projection 20B on the side to be fitted into the long guide shallow groove 15 of the inner holder 1C. Is formed in a substantially right triangle shape when viewed from the side so as to be locked to the locking receiving portion 15A.

  As in the case of the locking protrusion 19C, the locking protrusion 15B in which the locking protrusion 20B is locked to the locking projection 20B having a substantially right triangle shape in a side view of the outer housing 1A has a pulling direction of the internal holder 1C. It functions as a stopper part.

  1 and 4 is a mark for recognizing the key direction of the internal holder 1C, and the symbol K in FIGS. 1 and 3 indicates an optical connector plug (not shown) in the vertical direction. It is a keyway for determining and inserting.

  The known plug body P according to the present embodiment includes a ferrule 21 attached to the tip of the optical fiber tape core wire, as shown in FIGS. 9A, 9B and 10. A sleeve-like housing 22 that houses the ferrule 21 at the tip, an inner sleeve (not shown) mounted on the outer periphery of the housing 22, and an external sleeve that can be slid within a movable range secured in the axial direction of the housing 22 A cylindrical coupling 23 provided, a spring (not shown) that is housed in the housing 22 and elastically biases the ferrule 21 forward, and is opposite to the front end of the housing 22 where the ferrule 21 is provided. And a boot 24 attached to the rear end.

  Next, an example of use / operation of the configuration configured as described above will be described with reference to FIGS. 9 and 10.

  As shown in FIG. 9A, before the plug main body P is inserted into the adapter main body 1, the plug insertion port 2 has the upper and lower doors 3A and 3B of the shutter 3 attached by the elastic member 4 in the closing direction. Forced and blocked. At this time, the two upper and lower doors 3A and 3B rotated in the closing direction are locked in a substantially obtuse-angled V-shaped joined state by the opening edge 10 formed with the substantially obtuse-angled V-shaped recess 10A. The flat portions 9A and 9B at the tip portions of the upper and lower doors 3A and 3B are in contact with each other and are in close contact with each other with no gap.

  Next, as shown in FIG. 9 (a), when the plug main body P is inserted into the adapter main body 1, the two doors 3A and 3B are pushed by the plug main body P and are turned sideways toward the inside of the cover 1B. The doors 3 </ b> A and 3 </ b> B rotate inward against the urging force of the elastic member 4 so as to open the door.

  Then, as shown in FIG. 9B, when the plug main body P is further pushed and inserted into the plug insertion port 2 of the external housing 1A, the engagement of the internal holder 1C inserted into the external housing 1A is engaged. The stop arm 13 bends in the direction in which the stop arm 13 expands, and the distal end of the locking arm 13 is suspended and held by engaging portions (not shown) formed on the left and right wall surfaces of the plug main body P (not shown). The

  On the other hand, as shown in FIG. 10, when the other plug main body P is inserted into the other end opening side (the other plug insertion port 2 of the outer housing 1A) of the inner holder 1C, the inner holder 1C is made in the same manner as described above. The locking arms 13 bend in a direction in which the locking arms 13 expand to each other, and the leading ends of the locking arms 13 are suspended and held by locking portions (not shown) formed on the left and right wall surfaces of the plug body P. In this way, the optical reference surfaces of the plug bodies P inserted into the plug insertion openings 2 on the front and rear sides of the outer housing 1A are held in a state of being matched with each other.

P Plug body F Flange K Keyway S Mark 1 Adapter body 1A External housing 1B Cover 1C Internal holder 2 Plug insertion port 3 Shutter 3A Upper door 3B Lower door 4 Elastic member 5 Right side wall 6 Left side wall 7A, 7B Shaft holes 8A, 8B Projection shafts 9A, 9B Plane portion 10 Opening edge portion 10A Indented portions 11A, 11B Opening portion 12A Engaging hole portion 12B Locking protrusion 13 Locking arm 14 Guide deep bottom groove 14A Locking receiving portion 14B Wall surface portion 15 Guide shallow bottom groove 15A Locking receiving portion 15B Locking projection 15C Tapered surface 15D Horizontal top surface portion 15E Vertical wall surface portion 16 Guide deep bottom groove 16A Locking receiving portion 17 Guide intermediate bottom groove 17A Locking receiving portion 18 Guide shallow bottom groove 18A Locking receiving part 18B Locking protrusion 18C Vertical wall surface part 19 Locking protrusions 19A, 19B Locking protrusion 19C Locking protrusion 19D Rear vertical surface 20 Locking protrusion 20 A Locking projection 20B Locking projection 20C Rear vertical surface 21 Ferrule 22 Housing 23 Coupling 24 Boot 100 Plug insertion port 101 Arm-shaped locking piece

Claims (8)

  An optical adapter with a shutter, in which an adapter body having a plug insertion slot into which an optical connector plug is inserted is equipped with a shutter for closing the plug insertion slot so as to be freely opened and closed and urged toward each other by an elastic member in a closing direction. The shutter is divided into two vertically and vertically arranged so that the shutter is rotated inward when the shutter is pushed in by the optical connector plug inserted into the plug insertion slot. The adapter body has an external housing in which left and right side wall portions extend forward from the plug insertion opening, and shaft holes are formed at upper and lower ends of each tip portion of the left and right side wall portions. And projecting shafts formed at both ends of the upper door of the shutter are pivotally attached to the upper shaft holes of the left and right side wall portions facing each other. Facing the axial hole of each lower of the shutter with shutters optical adapter, wherein a projecting shaft which is formed on the left and right ends of the lower door is pivotally mounted in the.   The two upper and lower doors of the shutter have a vertical width where the front ends of the doors are joined together in a substantially obtuse angle V shape toward the inside when they are rotated in the closing direction. The optical adapter with a shutter according to claim 1, wherein the optical adapter has a flat surface portion that is in close contact with the shutter.   The adapter body includes a cover that is externally fitted to the outer housing so as to cover the shutter and the left and right side wall portions from the front side, and is rotated in a closing direction at the left and right facing positions of the front opening end of the cover. 3. An opening edge for locking the two upper and lower doors that have moved is provided, and a substantially obtuse V-shaped depression is formed at each center of the opening edge. The optical adapter with a shutter as described.   The cover has respective engagement hole portions formed on the upper wall surface and the lower wall surface thereof, and corresponding engagement projections are formed on the upper wall surface and the lower wall surface of the outer housing, respectively. The optical adapter with a shutter according to claim 3, wherein each engaging projection is engaged with each engaging hole when the outer fitting is externally fitted to the outer housing.   The external housing includes an internal holder that is inserted from a rear end side of the plug insertion opening, and is formed so that optical reference surfaces of plug bodies that are inserted from both end sides of the internal holder coincide with each other. Item 14. An optical adapter with a shutter according to Item 1.   The inner holder includes a plurality of guide grooves at the front ends of the outer upper wall surface and the outer lower wall surface, and a locking projection is engaged with and disengaged from the front grooves of the inner upper wall surface and the inner lower wall surface of the outer housing. The optical adapter with a shutter according to claim 1 or 5, wherein the optical adapter is formed so as to be freely fitted.   Locking that functions as a stopper portion in the pushing direction of the internal holder when the locking protrusion inside the external housing is fitted to the rear end of the guide groove formed on the external upper wall surface and the external lower wall surface of the internal holder The optical adapter with a shutter according to claim 5 or 6, wherein a receiving portion is formed.   A locking projection having a substantially right triangle shape in a side view is formed in front of the rear side of the guide groove formed on the outer upper wall surface and the outer lower wall surface of the inner holder, and the engagement inside the outer housing is formed on the rear surface of the locking projection. The optical adapter with a shutter according to any one of claims 5 to 7, wherein a locking receiving portion that functions as a stopper in a pulling direction of the inner holder is formed when a stop protrusion is fitted.

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