JP6962698B2 - Optical adapter with shutter - Google Patents

Description

The present invention is used for optically connecting two optical fibers with plug insertion ports of, for example, an MPO type push-pull type optical connector plug at both ends, and is used when used. The shutter is opened by inserting the connector plug into one plug insertion slot, and it is optical-coupled to the optical fiber cable inserted in the other plug insertion slot. When not in use, the optical connector plug is pulled out to insert one. 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, the 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 provided inside with a keyway K, and the optical reference surfaces of the respective optical connector plugs inserted into both plug insertion ports 100 are held in the fitting positions so as to match each other. The arm-shaped locking piece 101 is provided at symmetrical positions inside each plug insertion port 100.

At this time, in the state where the optical connector plug is not inserted into one plug insertion port 100, if the optical component related to the optical connector plug connected to the other plug insertion port 100 is in the operating state, one plug A harmful laser beam (for example, 5 mW or more) is guided to the insertion port 100, and when the optical fiber connector is fitted into the plug insertion port 100, the light from the operator's body, especially the optical cable, is directly viewed. There was a risk of causing serious harm to the light. 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, two doors that rotate inward when the optical connector plug is inserted into the plug insertion port of the optical connection component main body (adapter main body). It is equipped with a double door type shutter that is arranged horizontally, and the two doors of this shutter are mask members provided with a lock arm that can be locked in the locking groove on the optical connection component body (adapter body) side. By covering the plug insertion port, the optical connection component with a shutter is fixed by engaging the protrusions provided at the upper and lower ends of the two doors with the concave portion formed on the plug insertion port side of the main body of the optical connection component. be.

Japanese Patent No. 3846595

However, in the conventional double door type shutter in which two doors are arranged horizontally as shown in Patent Document 1, the plug insertion port of the adapter body has a horizontally long opening shape, and an optical connector inserted into the plug insertion port. When the shutter is pushed by the plug, it is composed of two doors that rotate inward and are divided into two left and right and arranged horizontally. Therefore, the radius of the two doors in the rotation direction is large. There is a defect that the depth dimension of the entire adapter body becomes long.

Further, since the mask member that covers the plug insertion port of the adapter body is formed with a long lock arm for locking in the locking groove on the optical connection component body (adapter body) side, the mask member is configured. It has the drawback of becoming complicated, large and expensive.

Moreover, the convex portions provided at the upper and lower ends of the two doors are engaged with the concave portions of the front opening formed on the plug insertion port side of the adapter body, and held by the mask member covered with the plug insertion port. There is a defect that the concave portion is easily removed from the convex portion and a strong connection to the plug insertion port side of the door cannot be obtained.

Therefore, the present invention has been devised in view of the above-mentioned conventional circumstances, and it is possible to reduce the radius of the two doors in the rotation direction to shorten the overall depth dimension of the adapter body. It is possible to form a cover on the plug insertion port side that is simpler, smaller, and lower in cost because there is no conventional lock arm, and a strong connection between the two doors to the plug insertion port side is possible. and to provide a resulting Cie Yatta equipped optical adapter.

In order to solve the above-mentioned problems, in the present invention, the adapter body having a plug insertion port into which the optical connector plug is inserted is provided with a shutter for closing the plug insertion port so as to be openable and closable, and an elastic member. An optical adapter with a shutter that is urged to close each other by means of the shutter so that the shutter rotates inward when the shutter is pushed by the optical connector plug inserted into the plug insertion slot. It is composed of two doors that are vertically arranged by dividing it into two upper and lower parts. The adapter body has left and right side wall portions extending forward from the plug insertion port, and the tips of the left and right side wall portions. An outer housing having shaft holes formed at both upper and lower ends of the portion and an inner holder fitted from the rear end side of the plug insertion port of the outer housing are provided, and the outer housings face each other on the left and right side wall portions thereof. Protruding shafts formed at both ends of the upper door of the shutter are pivotally attached to the upper shaft holes, and the left and right sides of the lower door of the shutter are inserted into the lower shaft holes of the left and right side walls facing each other. Protruding shafts formed at both ends are pivotally attached,
On the other hand, in the inner holder, a short guide deep bottom groove and a long guide shallow bottom groove are formed in parallel on the outer upper wall surface so as to open at the front end of the inner holder, and the short guide deep bottom groove is formed. A locking receiving portion is formed at the rear end toward the front of the internal holder, and a locking projection having a substantially right-angled triangular shape in side view is formed at the rear end and slightly front side of the long guide shallow bottom groove. At the rear end of the locking projection, a locking receiving portion is formed toward the rear of the internal holder.
A short guide deep bottom groove, a guide intermediate bottom groove, and a long guide shallow bottom groove are formed in parallel on the outer lower wall surface of the inner holder so as to open at the front end of the inner holder, and the short guide depth is formed. Locking receiving portions are formed at the rear ends of the bottom groove and the guide intermediate bottom groove toward the front of the inner holder, and side views are formed at the rear end and slightly front side of the long guide shallow bottom groove. A substantially right-angled triangular locking projection is provided, and a locking receiving portion is formed at the rear end of the locking projection toward the rear of the internal holder.
Further, on the lower wall surface of the plug insertion port of the outer housing, the short guide deep bottom groove and the guide intermediate bottom groove provided on the lower wall surface of the inner holder are fitted from the front end and engaged with the locking receiving portion at the rear end. The front end side so as to be locked by the two rectangular parallelepiped locking protrusions to be stopped and the locking receiving portion at the rear end of the locking protrusions provided in the long guide shallow bottom groove on the lower wall surface of the inner holder. It is formed in parallel with a locking projection having a substantially right-angled triangular shape in the side view, which is provided with a locking receiving portion.
The upper wall surface of the plug insertion port of the outer housing has a rectangular parallelepiped shape that fits from the front end of the short guide deep bottom groove provided on the upper wall surface of the inner holder and is locked to the locking receiving portion at the rear end. Side view with a locking receiving portion on the front end side so that it can be locked to the locking projection and the locking receiving portion at the rear of the locking projection provided in the long guide shallow bottom groove on the upper wall surface of the internal holder. It is characterized in that right-angled triangular locking projections are formed in parallel with each other.

The two upper and lower doors of the shutter have a vertical width in which the tips of the doors are joined in an obtuse angle V shape inward when they are rotated in the closing direction, and each tip has a surface. It has a flat portion that is in close contact with it.

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 rotates in the closing direction at the left and right opposite positions of the front opening end of the cover. It has an opening edge for locking the two moved upper and lower doors, and a substantially obtuse-angled V-shaped recess is formed at the center of each opening edge.

In the cover, engaging holes are formed on the upper wall surface and the lower wall surface thereof, and locking projections are formed on the upper wall surface and the lower wall surface of the outer housing corresponding to the engaging holes, respectively. At the time of outer fitting to the outer housing, each locking projection is engaged with each engaging hole portion.

According to the present invention, an adapter body having a plug insertion port into which an optical connector plug is inserted is provided with a shutter for closing the plug insertion port so as to be openable and closable, and is urged by an elastic member in the closing direction. An optical adapter with a shutter, the shutter is vertically arranged by dividing it into two vertically so that the shutter rotates inward when the shutter is pushed by the optical connector plug inserted into the plug insertion port. The adapter body is composed of two doors, the left and right side wall portions extend forward from the plug insertion port, and shaft holes are formed at both upper and lower ends of each tip portion of the left and right side wall portions. Each of the outer housing is provided with an inner holder to be inserted from the rear end side of the plug insertion port of the outer housing, and the outer housing is provided with the shutter's upper shaft holes facing each other on the left and right side wall portions thereof. The protrusions formed on both ends of the upper door are pivotally attached, and the protrusions formed on 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 walls. And
On the other hand, in the inner holder, a short guide deep bottom groove and a long guide shallow bottom groove are formed in parallel on the outer upper wall surface so as to open at the front end of the inner holder, and the short guide deep bottom groove is formed. A locking receiving portion is formed at the rear end toward the front of the internal holder, and a locking projection having a substantially right-angled triangular shape in side view is formed at the rear end and slightly front side of the long guide shallow bottom groove. At the rear end of the locking projection, a locking receiving portion is formed toward the rear of the internal holder.
A short guide deep bottom groove, a guide intermediate bottom groove, and a long guide shallow bottom groove are formed in parallel on the outer lower wall surface of the inner holder so as to open at the front end of the inner holder, and the short guide depth is formed. Locking receiving portions are formed at the rear ends of the bottom groove and the guide intermediate bottom groove toward the front of the inner holder, and side views are formed at the rear end and slightly front side of the long guide shallow bottom groove. A substantially right-angled triangular locking projection is provided, and a locking receiving portion is formed at the rear end of the locking projection toward the rear of the internal holder.
Further, on the lower wall surface of the plug insertion port of the outer housing, the short guide deep bottom groove and the guide intermediate bottom groove provided on the lower wall surface of the inner holder are fitted from the front end and engaged with the locking receiving portion at the rear end. The front end side so as to be locked by the two rectangular parallelepiped locking protrusions to be stopped and the locking receiving portion at the rear end of the locking protrusions provided in the long guide shallow bottom groove on the lower wall surface of the inner holder. It is formed in parallel with a locking projection having a substantially right-angled triangular shape in the side view, which is provided with a locking receiving portion.
The upper wall surface of the plug insertion port of the outer housing has a rectangular parallelepiped shape that fits from the front end of the short guide deep bottom groove provided on the upper wall surface of the inner holder and is locked to the locking receiving portion at the rear end. Side view with a locking receiving portion on the front end side so that it can be locked to the locking projection and the locking receiving portion at the rear of the locking projection provided in the long guide shallow bottom groove on the upper wall surface of the internal holder. Since the right-angled triangular locking projections are formed in parallel, the following effects can be obtained.

(1) The radius of the two doors in the rotation direction can be reduced to shorten the overall depth of the adapter body, and unlike the conventional technology, there is no large lock arm, which makes it simpler and smaller. Moreover, it is possible to form a low-cost cover on the plug insertion port side, and a strong bond between the two doors to the plug insertion port side can be obtained.

(2) Further, when the inner holder is inserted from the rear end side of the plug insertion port of the outer housing, after the short guide deep bottom groove and the guide intermediate bottom groove formed on the outer lower wall surface of the inner holder. The lower wall surface of the plug insertion port of the outer housing is attached to the end receiving portion and the rear end receiving portion of the locking projection having a substantially right-angled triangular shape in the side view provided on the rear end and slightly front side of the long guide shallow bottom groove. By locking each of the two rectangular parallelepiped locking protrusions and the locking protrusions having a substantially right-angled triangular shape in the side view, a function as a stopper portion in the pushing direction of the internal holder can be obtained. The inner holder can be accurately and easily assembled and fixed in a predetermined position inside the outer housing.

(3) At the same time, the rear end receiving portion of the short guide deep bottom groove formed on the outer upper wall surface of the internal holder and the side view substantially right angle provided on the rear end side of the long guide shallow bottom groove. At the rear end receiving portion of the triangular locking projection, one rectangular parallelepiped locking projection provided on the upper wall surface of the plug insertion port of the outer housing and a substantially right-angled triangular locking projection on the side surface are engaged with each other. By stopping, the function as a stopper portion in the pulling direction of the inner holder can be obtained, and further, the inner holder can be accurately and easily assembled and fixed at a predetermined position inside the outer housing.

It is an exploded perspective view of the adapter body which shows one mode for carrying out this invention. Similarly, it is a bottom perspective view of the inner housing of the adapter body. Similarly, it is a front view of the outer housing of the adapter body. Similarly, it is a perspective view of the outer housing of the adapter body in a horizontal semi-cross section. Similarly, it is a perspective view which shows the state which the internal holder is incorporated in the outer housing of the adapter body. Similarly, it is a perspective view which shows the state after assembling the adapter main body. Similarly, the state after assembly of the adapter main body 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. Similarly, the cross-sectional state of the adapter body after assembly is shown, (a) is a side cross-sectional view of the adapter body corresponding to AA of the outer housing shown in FIG. 3, and (b) is B of the outer housing shown in FIG. FIG. 3C is a side sectional view of the adapter body corresponding to −B, and FIG. 3C is a side sectional view of the adapter body corresponding to CC of the outer housing shown in FIG. The plug insertion sequence is shown, (a) is a cross-sectional view in which the plug is inserted, and (b) is a cross-sectional view after the plug is inserted. It is sectional drawing of the state in which the optical connector plugs are connected to each other by the adapter 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-type optical connector for interconnecting a pair of opposing MPO-type optical connector plugs P (hereinafter, abbreviated as plug body P). (Hereinafter, abbreviated as the adapter main body 1) is configured.

As shown in FIG. 1, the adapter body 1 is provided with a horizontally long rectangular opening-shaped plug insertion port 2 into which a square housing-shaped MPO-shaped plug body P is inserted at the front and rear ends, and closes the front end of the plug insertion port 2. A square tubular outer housing 1A equipped with a shutter 3 for opening and closing, and a horizontally long rectangular opening that is externally fitted to the outer housing 1A so as to cover the plug insertion port 2 on the front end side together with the shutter 3. It is generally composed of a cover 1B and a flat tubular inner holder 1C that is inserted into the inside from a plug insertion port 2 on the rear end side of the outer housing 1A.

The shutter 3 is composed of two horizontally long rectangular plate-shaped doors 3A and 3B in which a plate material having an area for closing the front end of the horizontally long rectangular opening-shaped plug insertion port 2 is divided into two vertically and arranged vertically. When the two doors 3A and 3B are pushed in by the plug body P inserted into the plug insertion port 2, they rotate inward, respectively. At this time, in the present embodiment, the two doors 3A, It is formed so that the radius of 3B in the rotation direction becomes small.

That is, in the outer housing 1A, the left and right side wall portions 5 and 6 extend forward from the plug insertion port 2 on the front end side, and shaft holes are provided at both upper and lower ends of the tip portions of the left and right side wall portions 5 and 6. 7A and 7B are bored respectively. Then, the protruding 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 pivotally attached to each other. Protruding shafts 8B formed at both ends of the lower door 3B of the shutter 3 are pivotally attached to the respective lower shaft holes 7B facing each other.

Further, the doors 3A and 3B are urged to each other in the 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 protrusions 8A and 8B are connected in series. An elastic member 4 made of a metal leaf spring formed by bending into a substantially L shape is hung on the openings 11A and 11B, and one end thereof is pressed against the inner side surface (back surface) of the doors 3A and 3B of the shutter 3. The other end is pressed against the inner surface of the cover 1B that is externally fitted to the outer housing 1A, thereby urging 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 by the plug body P, the doors 3A and 3B resist the urging force of the elastic member 4 so as to open the double door toward the inside of the cover 1B. Rotate.

The vertical widths of the two upper and lower doors 3A and 3B of the shutter 3 are such that when the doors are rotated in the closing direction, the tips of the doors are joined in an obtuse angle V shape toward the inside. have. Such a substantially obtuse-angled V-shaped joint state between the doors 3A and 3B is a substantially obtuse-angled V-shaped recess 10A formed in the opening edge portion 10 of the cover 1B described later that locks the doors 3A and 3B. It corresponds to. Further, the doors 3A and 3B are formed of flat surface portions 9A and 9B so that the tip portions thereof are in close contact with each other without a gap when they rotate 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 a position opposite to the left and right of the front opening end of the cover 1B. In order to lock the two upper and lower doors 3A and 3B that are rotated in the closing direction so as to be in a substantially obtuse-angled V-shaped joint state, a substantially obtuse-angled V-shaped recess 10A is provided in the front of each center. The opening edge portion 10 is formed.

Rectangular small hole-shaped engaging holes 12A are formed at the center of the upper wall surface of the cover 1B and at right-angled positions of the lower wall surface, and above the outer housing 1A corresponding to these engaging holes 12A. Three locking projections 12B (one on the upper wall surface and two on the lower wall surface) are formed at symmetrical positions in the center of the wall surface and on the lower wall surface, and the outer housing of the cover 1B is formed. At the time of outer fitting to 1A, each locking projection 12B is engaged with each engaging hole portion 12A.

The internal holder 1C expands from each other in order to hold both plug bodies P (ferrules not shown) at a fitting position where the optical reference planes of the plug bodies P to be inserted from both ends coincide with each other. A flexible locking arm 13 is provided at symmetrical positions on the front-rear opening side with each tip protruding.

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

At the rear end of the short guide deep bottom groove 14, a locking receiving portion 14A is formed toward the front of the internal holder 1C.

On the other hand, on the slightly front side of the rear end of the long guide shallow bottom groove 15, it faces the rear of the internal holder 1C, that is, faces in the direction opposite to the locking receiving portion 14A, and functions as a stopper. The receiving portion 15A is formed.

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

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

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

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

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

Further, 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 internal holder 1C are provided on the front portion of the lower wall inside the outer housing 1A. Three locking projections 19 having different heights that are slidably fitted in the bottom groove 18 are formed in parallel at the same intervals.

That is, in the locking projection 19, the short guide deep bottom groove 16 provided on the lower wall surface of the internal holder 1C and the locking projections 19A and 19B on the side of fitting into the guide intermediate bottom groove 17 are the outer housings. 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 projection 19C on the side that fits into the long guide shallow bottom groove 18 forms the vertical wall surface portion 19D at the front portion thereof, and locks the locking projection 19C at the center of the lower wall portion in the outer housing 1A. It is formed in a substantially right-angled triangular shape in a side view so as to be locked to the receiving portion 18A.

Thus, as shown in FIG. 8 (a), (b) , rectangular locking projection 19A of the outer housing 1A, 19B which, when fitted to the inner holder 1C, a short of the internal Hol da 1C It is locked to the locking receiving portions 16A and 17A of the guide deep bottom groove 16 and the guide intermediate bottom groove 17. That is, the rear ends of the locking projections 19A and 19B function as stoppers in the pushing direction of the internal holder 1C.

Further, as shown in FIG. 8C, the locking projection 19C having a substantially right-angled triangular shape in the side view of the outer housing 1A has a long guide shallowness of the inner holder 1C when the inner holder 1C is fitted. The locking projection 18B provided behind the bottom groove 18 is locked to the locking receiving portion 18A formed of the vertical wall surface portion 18C. That is, the locking receiving portion 18A to which the locking projection 19C is locked functions as a stopper portion in the pulling direction of the internal holder 1C.

Further, as shown in FIG. 3 , 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 are freely fitted are formed at intervals.

That is, in the locking projection 20, the locking projection 20A on the side that fits into the short guide deep bottom groove 14 of the internal holder 1C fits the groove 14 in front of the lower wall portion in the outer housing 1A. It is formed in a rectangular parallelepiped shape with the same height and the same length. The locking projection 20A is formed to have the same shape and size as the locking projection 19A provided on the lower wall portion in the outer housing 1A.

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

On the other hand, as shown in FIG. 8A , the locking projection 20 has a vertical wall surface in front of the locking projection 20B on the side that fits into the long guide shallow bottom groove 15 of the internal holder 1C. The locking receiving portion 20D composed of the portions 20C is formed in a substantially right-angled triangular shape in a side view so as to be locked to the locking receiving portion 15A on the rear surface of the locking projection 15B at the center of the upper wall portion in the outer housing 1A. It is formed.

Similar to the locking projection 19C, the locking projection 20B having a substantially right-angled triangular shape in the side view of the outer housing 1A also has a locking receiving portion 15A to which the locking projection 20B is locked, and the internal holder 1C has a locking projection 20B. It functions as a stopper in the pulling direction.

The reference numeral S in FIGS. 1 and 6 is a mark for distinguishing the key direction of the internal holder 1C, and the reference numeral K in FIGS. 1 and 2 indicates the optical connector plug (not shown) in the vertical direction. It is a keyway for defining and inserting.

The well-known plug main body P according to the present embodiment includes a ferrule 21 attached to the tip of the optical fiber tape core wire and the ferrule 21 as shown in FIGS. 9 (a), 9 (b) and 10. A sleeve-shaped housing 22 in which the ferrule 21 is housed at the tip, an internal sleeve (not shown) attached to the outer periphery of the housing 22, and an internal sleeve that can be externally inserted into the internal sleeve to allow sliding movement 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 inside the housing 22 and elastically biases the ferrule 21 to the front side, and the front end of the housing 22 where the ferrule 21 is provided are opposite to each other. It generally has a boot 24 attached to the rear end portion.

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

As shown in FIG. 9A, before the plug body P is inserted into the adapter body 1, the plug insertion port 2 has two upper and lower doors 3A and 3B of the shutter 3 attached by the elastic member 4 in the closing direction. It is being pushed and blocked. At this time, the two upper and lower doors 3A and 3B that rotate in the closing direction are locked in a substantially obtuse-angled V-shaped joint state by the opening edge portion 10 forming the substantially obtuse-angled V-shaped recessed portion 10A. The flat surfaces 9A and 9B at the tips of the two upper and lower doors 3A and 3B are in close contact with each other and are held in contact with each other.

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

Then, as shown in FIG. 9B, when the plug body P is further pushed in and inserted into the plug insertion port 2 of the outer housing 1A, the internal holder 1C fitted inside the outer housing 1A is engaged. The stop arm 13 bends in the direction of expanding each other, and the tip of the locking arm 13 is hung and held by an engaging portion (not shown) formed on the left and right wall surfaces of the plug body P (ferrule (not shown)). NS.

On the other hand, as shown in FIG. 10, when the other plug body P is inserted into the other end opening side of the inner holder 1C (the other plug insertion port 2 of the outer housing 1A), the inner holder 1C is similarly described above. The locking arms 13 of the above are bent in a direction of expanding each other, and the tip of the locking arm 13 is hung and held on a locking portion (not shown) formed on the left and right wall surfaces of the plug body P. In this way, the optical reference planes of the plug bodies P inserted into the front and rear plug insertion ports 2 of the outer housing 1A are held in a state of being aligned with each other.

P Plug body F Flange K Key groove 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 part 6 Left side wall part 7A, 7B Shaft holes 8A, 8B Protruding shafts 9A, 9B Flat surface 10 Opening edge 10A Recessed 11A, 11B Opening 12A Engaging hole 12B Locking protrusion 13 Locking arm 14 Guide deep bottom groove 14A Locking receiving part 14B Vertical wall surface Part 15 Guide shallow bottom groove 15A Locking receiving part 15B Locking protrusion 15C Tapered surface 15D Horizontal top surface part 15E Vertical wall surface part 16 Guide deep bottom groove 16A Locking receiving part 17 Guide intermediate bottom groove 17A Locking receiving part 18 Guide shallow bottom grooves 18A lock receiving portion 18B engaging protrusion 18C vertical wall portion 19 locking projection 19A, 19B locking projection 19C locking projection 19D vertical wall surface portion 20 locking projection 20A engaging protrusion 20B locking projection 20C vertical wall surface portion
20D Lock receiving part 21 Ferrule 22 Housing 23 Coupling 24 Boot 100 Plug insertion port 101 Arm-shaped locking piece

Claims (4)

An optical adapter with a shutter, in which 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 openable and closable, and is urged to each other in the closing direction by an elastic member. The shutter is divided into upper and lower parts and vertically arranged so that the shutter rotates inward when the shutter is pushed by the optical connector plug inserted into the plug insertion port. is configured, the adapter body, the extended left and right side wall portions toward the front from the plug insertion opening, the outer housing and the shaft hole in the upper and lower ends of each distal portion of the left and right side wall portions, which are each formed Each of the inner holders is provided with an internal holder that is inserted from the rear end side of the plug insertion port of the outer housing, and the outer housing is formed at both ends of the upper door of the shutter in each of the upper shaft holes facing each other on the left and right side wall portions thereof. The protruding shafts are pivotally attached, and the protruding shafts formed on the left and right ends of the lower door of the shutter are pivotally attached to the lower shaft holes facing each other in the left and right side wall portions.
On the other hand, in the inner holder, a short guide deep bottom groove and a long guide shallow bottom groove are formed in parallel on the outer upper wall surface so as to open at the front end of the inner holder, and the short guide deep bottom groove is formed. A locking receiving portion is formed at the rear end toward the front of the internal holder, and a locking projection having a substantially right-angled triangular shape in side view is formed at the rear end and slightly front side of the long guide shallow bottom groove. At the rear end of the locking projection, a locking receiving portion is formed toward the rear of the internal holder.
A short guide deep bottom groove, a guide intermediate bottom groove, and a long guide shallow bottom groove are formed in parallel on the outer lower wall surface of the inner holder so as to open at the front end of the inner holder, and the short guide depth is formed. Locking receiving portions are formed at the rear ends of the bottom groove and the guide intermediate bottom groove toward the front of the inner holder, and side views are formed at the rear end and slightly front side of the long guide shallow bottom groove. A substantially right-angled triangular locking projection is provided, and a locking receiving portion is formed at the rear end of the locking projection toward the rear of the internal holder.
Further, on the lower wall surface of the plug insertion port of the outer housing, the short guide deep bottom groove and the guide intermediate bottom groove provided on the lower wall surface of the inner holder are fitted from the front end and engaged with the locking receiving portion at the rear end. The front end side so as to be locked by the two rectangular parallelepiped locking protrusions to be stopped and the locking receiving portion at the rear end of the locking protrusions provided in the long guide shallow bottom groove on the lower wall surface of the inner holder. It is formed in parallel with a locking projection having a substantially right-angled triangular shape in the side view, which is provided with a locking receiving portion.
The upper wall surface of the plug insertion port of the outer housing has a rectangular parallelepiped shape that fits from the front end of the short guide deep bottom groove provided on the upper wall surface of the inner holder and is locked to the locking receiving portion at the rear end. Side view with a locking receiving portion on the front end side so that it can be locked to the locking projection and the locking receiving portion at the rear of the locking projection provided in the long guide shallow bottom groove on the upper wall surface of the internal holder. An optical adapter with a shutter, characterized in that each of the right-angled triangular locking projections is formed in parallel. The two upper and lower doors of the shutter have a vertical width in which the tips of the doors are joined in an obtuse angle V shape inward when they are rotated in the closing direction, and each tip has a surface. The optical adapter with a shutter according to claim 1, wherein the optical adapter has a flat portion 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 rotates in the closing direction at the left and right opposite positions of the front opening ends of the cover. 2. The described optical adapter with shutter. In the cover, engaging holes are formed on the upper wall surface and the lower wall surface thereof, and locking projections are formed on the upper wall surface and the lower wall surface of the outer housing corresponding to the engaging holes, respectively. The optical adapter with a shutter according to claim 3, wherein each locking projection is engaged with each engaging hole portion at the time of external fitting to the outer housing.

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