TWI600935B - Optical fiber adapter with shutter member - Google Patents

Description

Fiber optic adapter with shading

The present invention relates to a fiber optic adapter, and more particularly to a fiber optic adapter having a light blocking member.

Since the optical fiber has the advantages of high frequency width and low loss, it has been widely used as a transmission medium for signals in recent years. In order for the signal to be transmitted to a greater distance, a high power laser diode is born, thus greatly increasing the energy coupled to the fiber. However, when the above-mentioned high-intensity infrared beam is emitted from one end of the optical fiber, the human eye cannot judge the presence or absence of the light beam. If the operator's eyes are inadvertently exposed directly to the light beam, permanent visual damage is often caused.

Referring to FIG. 1, a conventional optical fiber adapter 100 has a body 110. The body 110 is provided with a chamber 120 surrounded by a plurality of side walls 160, which can be respectively connected to an optical fiber connector 190. connection. The side wall 160 is provided with a notch 130. The notch 130 can be engaged with the protrusion 192 on the mating connector 190 to have a function of alignment. In addition, the outer side of the opposite side walls 160 is provided with a recess 140 on which a snap-up spring (not shown) can be mounted to assist in positioning the adapter 100 when assembled and used. When the fiber optic connector 190 is inserted into the chamber 120 of the adapter 100, the high power beam emerging from the end of the ferrule 196 via the pigtail 194 of the connector 190 passes through the chamber at the other end of the adapter 100. 120, if there is no obstruction, it may be directly exposed to the eyes, causing damage to vision. Generally, the chamber 120 to which the connector 190 is not inserted is plugged with a plug 180 to prevent dust contamination and to shield the light beam. When the connector 190 is to be inserted, the plug 180 is removed. However, the plug 180 described above is liable to be lost, and during the removal process, the human eye may also be exposed to the light beam transmitted by the connector 190.

Referring to FIG. 2, a fiber optic adapter 200 having a light-shielding and dust-proof effect is provided. A cover 250 is disposed at the open end of the chamber 120, and one side thereof is pivotally connected to the body 110, and the cover 250 is covered by the elastic force of the torsion spring 260. The open end of the chamber 120 is sealed to prevent the light beam from being emitted. If the fiber optic connector 190 is to be inserted into the chamber 120, the cover 250 must be lifted before the connector 190 can be inserted. The adapter 200 with the cover 250 is required to process the body 110 to pivot the cover 250 thereto. Therefore, the manufacture of the adapter 200 is relatively complicated and the cost is relatively high.

Referring to FIG. 3, a protective device 300 for use in the optical fiber adapter 100 is provided with a cover 350 at the open end of the hollow cover 310. One side of the cover 350 is pivotally connected to the cover 310, and the torsion spring 360 is utilized. The spring force causes the cover 350 to cover the open end of the cover 310. The hollow cover 310 can be sleeved on the body 110 of the adapter 100 to cover the notch 130 and the opening of the chamber 120 to prevent the emission of light beams and to avoid dust contamination. However, if only the functions of shading and dust prevention are required, the above-mentioned guard device 300 also has a complicated structure and a relatively high manufacturing cost.

In view of this, there is a need to propose a solution to solve the above problems.

It is an object of the present invention to provide a fiber optic adapter that shields the beam of light emitted by the chamber, thereby preventing the beam from damaging the eye. Further, the optical fiber adapter of the present invention also has a dustproof effect.

To achieve the above objective, the optical fiber adapter of the present invention comprises a body, two first hooks, a first light blocking member, a second light blocking member and an inner casing. The body has an axial chamber defined by a first wall, a second wall, a third wall and a fourth wall, wherein the first wall is opposite to the third wall and the second wall The fourth wall is connected. The two axial ends of the chamber respectively have a first opening and a second opening, wherein the second opening is for insertion of a first fiber optic connector. The first hooks are respectively extended by the second wall and the fourth wall toward the second opening of the chamber for hooking on the first fiber connector. The first light-shielding member is elastic and integrally formed, and is disposed in the housing of the body by the first opening, wherein the first light-shielding member comprises a first base portion, a first light-shielding portion and a first connecting portion. The first base is disposed on the first wall of the body, and the first light shielding portion extends toward the third wall of the body. The first connecting portion is connected to the first light blocking portion and the first base portion, wherein the first light blocking portion is movable relative to the first base portion by the first connecting portion. The second light-shielding member is elastic and integrally formed, and is disposed in the chamber of the body by the first opening, wherein the second light-shielding member comprises a second base portion, a second light-shielding portion and a second connecting portion. The second base is disposed on the third wall of the body, and the second light shielding portion extends toward the first wall of the body. The second connecting portion is connected to the second light shielding portion and the second base portion, wherein the second light shielding portion is movable relative to the second base portion by the second connecting portion. The inner casing is placed into the body chamber by the first opening. The inner casing has an axial chamber formed by a fifth wall, a sixth wall, a seventh wall and an eighth wall, wherein the fifth wall is opposite to the seventh wall, and is sixth The wall and the eighth wall are connected. The two axial ends of the inner casing chamber respectively have a third opening and a fourth opening. A recess is formed in the fifth wall for inserting a protrusion on a second fiber optic connector. The inner casing further includes two second hooks extending from the sixth wall and the eighth wall toward the third opening for hooking on the second fiber connector.

The above and other objects, features, and advantages of the present invention will become more apparent from the embodiments of the invention.

Referring to Figures 4a and 4b, there are shown a conventional male MPO type optical fiber connector 400a and a female MPO type optical fiber connector 400b, respectively. An elongated protrusion 412 is formed on the upper surface 410 of the front section of the optical fiber connectors 400a and 400b, and a concave portion 414 is formed on each of the front sides. A plurality of optical fibers 430 are exposed on the end faces 420 of the front ends of the optical fiber connectors 400a and 400b, wherein the end faces of the respective optical fibers 430 are flush with the end faces 420 of the optical fiber connectors 400a and 400b. In addition, two guiding holes 450 are formed on the end surface 420 of the optical fiber connector 400b, and a pair of guiding pins 440 are protruded from the end surface 420 of the optical fiber connector 400a, and can be respectively inserted into the guiding holes 450.

Referring to FIGS. 5a to 8d, a fiber optic adapter having a light shielding member, such as an MPO fiber optic adapter, includes a body 500, an inner casing 600, a first light blocking member 700, and a second light blocking member 800. Referring to FIGS. 5a to 5f, the body 500 included in the optical fiber adapter of the present invention is formed by plastic molding in an injection molding manner, and has a shape substantially a hollow rectangular parallelepiped shape. The body 500 has a top wall 511, a bottom wall 512, a right wall 513 and a left wall 514, which together define an axial chamber 515 having two opposite first openings 517 and a second in the axial direction. Opening 518. A square opening 521 is formed in the top wall 511 near the first opening 517, and a square opening 522 is formed in the bottom wall 512 near the first opening 517. In one embodiment, the openings 521, 522 are through holes. A hook 542 is formed on each of the right wall 513 and the left wall 514, and is oppositely disposed and extends toward the second opening 518. In one embodiment, the hooks 542 are integrally formed with the right wall 513 and the left wall 514, respectively. In addition, at least one blocking block 550 is formed on the top wall 511 near the second opening 518. The blocking block 550 includes a vertical portion 551 extending perpendicularly from the top wall 511, and a first portion from the vertical portion 551. The opening portion 517 is parallel to the horizontal portion 552 extending from the top wall 511, that is, the blocking block 550 has an L-shaped cross section. Therefore, an accommodating space 553 is formed between the blocking block 550 and the top wall 511, and the receiving portion is formed. The space 553 has an opening toward the first opening 517. In one embodiment, the present invention can include two blocking blocks 550, one of which is adjacent to the right wall 513 and the other is adjacent to the left wall 514, and the vertical portions 551 of the two blocking blocks 550 can be extended toward each other. Together. Similarly, at least one blocking block 560 is formed on the bottom wall 512 near the second opening 518. The blocking block 560 includes a vertical portion 561 extending perpendicularly from the bottom wall 512, and a vertical opening 561 toward the first opening 517. The horizontal portion 562 extending parallel to the bottom wall 512, that is, the blocking block 560 has an L-shaped cross section. Therefore, an accommodating space 563 is formed between the blocking block 560 and the bottom wall 512, and the accommodating space 563 is formed. There is an opening facing the first opening 517. In one embodiment, the present invention can include two blocking blocks 560, one of which is adjacent to the right wall 513 and the other is adjacent to the left wall 514, and the vertical portions 561 of the two blocking blocks 560 can be connected to each other and connected Together. The distance between the horizontal portions 562 of the two blocking blocks 560 is slightly greater than the width of the protrusions 412 on the fiber optic connectors 400a, 400b of Figures 4a, 4b.

Referring to FIGS. 6a to 6d, the inner casing 600 included in the optical fiber adapter of the present invention is molded by plastic molding in an injection molding manner. The inner casing 600 has a hollow structure and includes a top wall 611, a bottom wall 612, a right wall 613 and a left wall 614, which together define an axial chamber 615 having two opposite axial directions. The third opening 617 and the fourth opening 618. Each of the right wall 613 and the left wall 614 is formed with a hook 642 which is oppositely disposed and extends toward the third opening 617. A cantilever 621, 622 extends from the center of the top wall 611 and the bottom wall 612 toward the third opening 617. The cantilevers 621 and 622 are respectively formed with protrusions 631 and 632, and the protrusions 631 and 632 are located in the chamber. 615 outside. A rectangular recess 641 is formed in the top wall 611 of the chamber 615, wherein the width of the recess 641 is slightly larger than the width of the protrusion 412 on the optical fiber connectors 400a, 400b of Figs. 4a, 4b for accommodating the optical fiber connection. A protrusion 412 on the device 400a, 400b.

Referring to FIGS. 7a to 7d, the first light blocking member 700 included in the optical fiber adapter of the present invention has elasticity and is integrally formed of metal. The first light blocking member 700 includes a light shielding portion 710 , a connecting portion 720 , a base portion 730 , and a trigger portion 740 . The connecting portion 720 has a U-shaped cross section, one end of which is connected to the trigger portion 740, and the other end is connected to the light blocking portion 710 and the base portion 730. The light shielding portion 710 extends from the connection portion 720 at an angle greater than 90 degrees and less than 180 degrees, and the light shielding portion 710 has a portion 714 fixed to the connection portion 720. The light shielding portion 710 may include one or a plurality of connected flat plates, and the light shielding portion 710 is movable relative to the base portion 730. When the light shielding portion 710 receives a thrust, it will approach the base portion 730; and when the thrust disappears, the light shielding portion 710 will return to the original position due to its own elastic force. The base 730 can include two elongated flat plates 732 extending in parallel from the connecting portion 720. The roots 734 of the two elongated flat plates 732 are fixed to the connecting portion 720 and are located on both sides of the root portion 714 of the light shielding portion 710. The trigger portion 740 extends from the connecting portion 720 at an angle of approximately 90 degrees and can be pressed against the light blocking portion 710. One end of the trigger portion 740 is fixed to the connecting portion 720, and the trigger portion 740 can have a C-shaped cross section, and the outer diameter thereof is D1.

Referring to FIGS. 8a to 8d, the second light blocking member 800 included in the optical fiber adapter of the present invention is similar to the first light blocking member 700, and is also elastic and integrally formed of metal. The second light blocking member 800 includes a light shielding portion 810 , a connecting portion 820 , a base portion 830 , and a trigger portion 840 . The connecting portion 820 has a U-shaped cross section, one end of which is connected to the trigger portion 840, and the other end is connected to the light blocking portion 810 and the base portion 830. The light shielding portion 810 extends from the connection portion 820 at an angle greater than 90 degrees and less than 180 degrees, and the light shielding portion 810 has a portion 814 fixed to the connection portion 820. The light shielding portion 810 may include one or a plurality of segments connected to each other, and the light shielding portion 810 is movable relative to the base portion 830. When the light shielding portion 810 receives a thrust, it will approach the base portion 830; and when the thrust disappears, the light blocking portion 810 will return to the original position due to its own elastic force. The base 830 can include two elongated flat plates 832 extending in parallel from the connecting portion 820. The roots 834 of the two elongated flat plates 832 are fixed to the connecting portion 820 and are located on both sides of the root portion 814 of the light blocking portion 810. The trigger portion 840 extends from the connecting portion 820 at an angle greater than 90 degrees and can be pressed against the light blocking portion 810. One end of the trigger portion 840 is fixed to the connecting portion 820, and the trigger portion 840 can have a C-shaped cross section with an outer diameter D2, wherein D2 is smaller than D1.

Referring to FIGS. 9 and 11, when assembling the optical fiber adapter of the present invention, the second light blocking member 800 is first placed into the body 500 from the first opening 517. The second light blocking member 800 is placed in such a manner that the connecting portion 820 faces forward and faces the blocking block 560, and the connecting portion 820 is pushed into the accommodating space 563. When the connecting portion 820 is pushed into the accommodating space 563, the opening thereof faces the first opening 517, the base portion 830 is attached to the bottom wall 512 of the body 500, the light blocking portion 810 extends toward the top wall 511, and the trigger portion 840 meets. The top wall 511 and the second opening 518. After the second light blocking member 800 is placed, the first light blocking member 700 is then placed into the body 500 from the first opening 517. The first light blocking member 700 is placed in such a manner that the connecting portion 720 faces forward and faces the blocking block 550, and the connecting portion 720 is pushed into the accommodating space 553. When the connecting portion 720 is pushed into the accommodating space 553, the opening thereof faces the first opening 517, the base portion 730 is attached to the top wall 511 of the body 500, the light blocking portion 710 extends toward the bottom wall 512, and the light blocking portion 710 is further The end portion of the light shielding portion 810 of the second light blocking member 800 is pressed, and the trigger portion 740 faces the bottom wall 512, the second opening 518, and the trigger portion 840.

Finally, the inner casing 600 is placed into the body 500 from the first opening 517. The inner casing 600 is placed in such a manner that its hook 642 faces away from the second opening 518 of the body 500 and is inserted into the body 500 from the first opening 517. The inner casing 600 and the body 500 may be assembled in such a manner that the top wall 611 and the bottom wall 612 of the inner casing 600 directly face the top wall 511 and the bottom wall 512 of the body 500, respectively, or directly face the body 500, respectively. The bottom wall 512 and the top wall 511. In the assembled manner shown in FIG. 9, after the inner casing 600 is placed in the body 500, the top wall 611 of the inner casing 600 directly faces the top wall 511 of the body 500, and the bottom wall 612 directly faces the body 500. The bottom wall 512. During the pushing process of the inner casing 600, the protrusions 631, 632 thereof slide on the top wall 511 and the bottom wall 512 of the body 500, respectively, and thus the cantilevers 621, 622 are bent. When the inner casing 600 continues to advance so that the protrusions 631, 632 are respectively caught in the openings 521, 522 of the top wall 511 and the bottom wall 512 of the body 500, the cantilevers 621, 622 will no longer be pressed and thus bounce, thus The assembly of the fiber optic adapter was completed. Figure 10 shows the fiber optic adapter of the present invention after assembly.

Referring to FIG. 11, when the optical fiber connector 400a or 400b is not inserted into the body 500 from the second opening 518, the light shielding portions 710, 810 of the light blocking members 700, 800 may stand up and partially overlap. If there is an optical fiber connector, for example, when the optical fiber connector 400a is inserted into the inner casing 600 from the third opening 617, the light beam emitted from the optical fiber 430 of the optical fiber connector 400a is blocked by the rising light shielding portions 710, 810. This prevents the beam from hurting the eyes. In addition, a protrusion may be formed on the right wall 513 and the left wall 514 of the body 500, and the edges of the rising light shielding portions 710 and 810 can be attached to the protrusions, so that dust can be prevented from the second opening. The 518 enters and contaminates the fiber optic connector 400a that has been inserted into the inner casing 600.

Referring to Figures 12 and 13, the fiber connector 400b is intended to be inserted into the body 500 from the second opening 518 by the elongated protrusions 412 on the surface thereof passing through the gap between the horizontal portions 562 of the two blocking blocks 560. Because the triggering portion 740 of the light blocking member 700 is larger than the triggering portion 840 of the light blocking member 800, the optical fiber connector 400b is first pressed into the triggering portion 740 when the optical connector 400b is inserted into the body 500, and the triggering portion 740 is further pressed to the light shielding portion 710 to swing toward the top wall 511. . After the optical fiber connector 400b is continuously pushed in, the pressing portion 840 is started to be pressed, and the trigger portion 840 is further pressed to the light shielding portion 810 to swing toward the bottom wall 512. The fiber connector 400b continuously presses the trigger portions 740, 840 during the advancement process, and the trigger portions 740, 840 thus continuously press the light shielding portions 710, 810 to gradually swing toward the top wall 511 and the bottom wall 512, respectively. When the end surface 420 of the optical fiber connector 400b moves beyond the triggering portions 740, 840, the optical fiber connector 400b begins to directly press the light shielding portions 710, 810 so that the end portions thereof are closer to the top wall 511 and the bottom wall 512, respectively.

When the optical fiber connector 400b is pushed to the positioning, the guiding pins 440 on the optical fiber connector 400a are respectively inserted into the guiding holes 450 of the optical fiber connector 400b, and the hooks 542 on the body 500 are respectively hooked on the optical fiber connector 400b. Within the recess 414, the fibers 430 of the fiber optic connector 400b contact the fiber 430 of the fiber optic connector 400a, respectively, thus completing the mating of the two fiber connectors 400a, 400b. After the fiber connectors 400a, 400b are docked, the light shielding portion 710 is positioned between the top wall 511 and the fiber connector 400b, and the light shielding portion 810 is positioned between the bottom wall 512 and the fiber connector 400b. When the optical fiber connector 400b is pulled out of the body 500, the light shielding portions 710, 810 return to the original position due to their own resilience, and have the function of blocking the light beam.

According to the optical fiber adapter of the present invention, the protrusions 631, 632 on the inner casing 600 are respectively inserted into the openings 521, 522 of the top wall 511 and the bottom wall 512 of the body 500, thereby preventing the inner casing 600 from pulling out the body. 500 outside. A recess 641 in the inner casing 600 is used to receive the projections 412 on the fiber optic connectors 400a, 400b, thereby limiting the insertion of the fiber optic connectors 400a, 400b into the inner casing 600 in only a predetermined orientation. In addition, the present invention may be selected such that the top wall 611 and the bottom wall 612 of the inner casing 600 directly face the top wall 511 and the bottom wall 512 of the body 500, respectively, or directly face the bottom wall of the body 500, respectively. 512 and the top wall 511, the polarity of the two fiber connectors 400a and 400b can be selected. The hooks 542, 642 on the body 500 and the inner casing 600 are used to hook into the recesses 414 on the fiber optic connectors 400a, 400b.

Referring again to FIGS. 12 and 13, when the optical fiber connector 400a or 400b is to be inserted into the optical fiber adapter of the present invention, the optical connectors 400a and 400b are directly inserted from the second opening 518 without first removing the light blocking members 700 and 800. The body 500 may be inside. At this time, the light shielding portions 710 and 810 are pressed to be in close contact with the top wall 511 and the bottom wall 512, respectively. When the optical fiber connectors 400a and 400b are pulled out of the main body 500, the light shielding portions 710 and 810 return to the original position due to their own return elastic force, and have the function of blocking the light beam.

According to the optical fiber adapter of the present invention, the trigger portions 740, 840 do not have to have a C-shaped cross section, and other shapes such as a circular or triangular cross section may be used. The triggering portions 740, 840 are designed to be pressed to the trigger portion 740 instead of the trigger portion 840 when the fiber optic connector 400a or 400b is inserted into the body 500 from the second opening 518. Further, the light blocking members 700 and 800 do not necessarily include the trigger portions 740 and 840, and the optical fiber connector inserted into the body 500 from the second opening 518 can also be directly pressed to the light shielding portions 710 and 810. In addition, when the openings 521, 522 in the body 500 are through holes, the elongated cans can be used to press the two cantilevers 621, 622 through the openings 521, 522, so that the inner casing 600 and the light blocking members 700, 800 can be used. take out. The blocking blocks 550, 560 on the body 500 are respectively used to restrict the movement of the connecting portions 720, 820 toward the second opening 518, and the light blocking members 700, 800 can be prevented from being pulled out of the body 500 from the second opening 518.

Although the present invention is exemplified by an MPO type fiber optic adapter, it should be understood by those of ordinary skill in the art that the fiber optic adapter according to the present invention may be other types of fiber optic adapters.

The present invention has been disclosed in the foregoing embodiments, and is not intended to limit the present invention. Any of the ordinary skill in the art to which the invention pertains can be modified and modified without departing from the spirit and scope of the invention. . Therefore, the scope of the invention is defined by the scope of the appended claims.

100 fiber optic adapter 110 body 120 chamber 130 notch 140 recess 160 side wall 170 groove 180 plug 190 fiber optic connector 192 protrusion 194 pigtail 196 bushing 200 fiber optic adapter 250 cover 260 torsion spring 300 guard 310 cover 350 cover 360 torsion spring 400a fiber optic connector 400b fiber optic connector 410 upper surface 412 protrusion 414 recess 420 end face 430 fiber 440 guide pin 450 guide hole 500 body 511 top wall 512 bottom wall 513 right wall 514 left wall 515 chamber 517 first opening 518 Two openings 521 opening 522 opening 542 hook 550 blocking block 551 vertical portion 552 horizontal portion 553 accommodating space 560 blocking block 561 vertical portion 562 horizontal portion 563 accommodating space 600 inner casing 611 top wall 612 bottom wall 613 right wall 614 left wall 615 chamber 617 third opening 618 fourth opening 621 cantilever 622 cantilever 631 protrusion 632 protrusion 641 groove 642 hook 700 first light blocking member 710 light blocking portion 714 root portion 720 connecting portion 730 base portion 732 flat plate 734 root portion 740 trigger portion 800 second light blocking member 810 light blocking portion 814 root portion 820 connecting portion 830 Base 832 plate 834 root 840 trigger

1 is a perspective view of a conventional fiber optic adapter and fiber optic connector. 2 is a perspective view of a conventional fiber optic adapter having a light blocking and dustproof effect. 3 is a perspective view of a conventional protective device for a fiber optic adapter. 4a is a perspective view of a conventional male MPO type fiber optic connector. Figure 4b is a perspective view of a conventional female MPO type fiber optic connector. 5a to 5d are perspective views of the body of the optical fiber adapter of the present invention at different viewing angles. Figure 5e is a cross-sectional view along line A-A of Figure 5a. Figure 5f is a cross-sectional view along line B-B of Figure 5a. 6a to 6d are perspective views of the inner casing of the optical fiber adapter of the present invention at different viewing angles. 7a to 7c are perspective views of the first light blocking member of the optical fiber adapter of the present invention at different viewing angles. Figure 7d is a side elevational view of the first opacifying member of the fiber optic adapter of the present invention. 8a to 8c are perspective views of the second light shielding member of the optical fiber adapter of the present invention at different viewing angles. Figure 8d is a side elevational view of the second opacifying member of the fiber optic adapter of the present invention. Figure 9 is an exploded perspective view of the fiber optic adapter of the present invention. Figure 10 is a perspective view of the fiber optic adapter of the present invention. Figure 11 shows the principle of shading of the first and second shades of the fiber optic adapter of the present invention. Figures 12 through 13 illustrate how the fiber optic adapter of the present invention can be used to interface two fiber optic connectors.

500 body 511 top wall 512 bottom wall 513 right wall 514 left wall 515 chamber 517 first opening 518 second opening 521 opening 522 opening 600 inner casing 611 top wall 612 bottom wall 613 right wall 614 left wall 621 cantilever 622 Cantilever 631 protrusion 642 hook 700 first light blocking member 710 light blocking portion 800 second light blocking member 810 light blocking portion 820 connecting portion

Claims (9)

A fiber optic adapter for docking two fiber optic adapters, the fiber optic adapter comprising: a body having an axial chamber, a first wall, a second wall, a third wall and a fourth wall The first wall is opposite to the third wall and is connected to the second wall and the fourth wall, and the two axial ends of the chamber respectively have a first opening and a second opening, The second opening is for inserting a first fiber connector into the housing of the body; the first hooks are respectively extended by the second wall and the fourth wall toward the second opening of the chamber for hooking The first optical connector is disposed on the first optical fiber connector, and the first light shielding member is disposed in the housing of the main body. The first light shielding member comprises: a first base portion disposed on the first light shielding member a first light-shielding portion extending toward the third wall of the body; a first connecting portion connected to the first light-shielding portion and the first base portion, wherein the first light-shielding portion is Being movable relative to the first base by the first connecting portion; and a first The second light-shielding member is inserted into the housing of the body, and the second light-shielding member comprises: a second base portion. Provided on the third wall of the body; a second light shielding portion extending toward the first wall of the body; a second connecting portion is connected to the second light shielding portion and the second base portion, wherein the second light shielding portion is movable relative to the second base portion by the second connecting portion; and a second trigger portion Extending from the second connecting portion; and an inner casing is inserted into the housing of the body by the first opening, the inner casing has an axial chamber, which is composed of a fifth wall and a a sixth wall, a seventh wall and an eighth wall are defined, wherein the fifth wall is opposite to the seventh wall and is connected to the sixth wall and the eighth wall, the fifth wall facing the a first wall, the two axial ends of the inner casing chamber respectively have a third opening and a fourth opening, and the chamber of the inner casing communicates with the chamber of the body through the fourth opening, The third opening is for inserting a second optical fiber connector into the inner casing of the inner casing for abutting with the first optical fiber connector inserted from the second opening, and the fifth wall is formed with a groove, the concave a slot for inserting a protrusion on the second fiber connector, the inner casing further comprising: two second hooks respectively The wall and the eighth wall extend toward the third opening for hooking on the second fiber connector, wherein when the first fiber connector is inserted into the body of the body from the second opening, Pressing the first triggering portion and the second triggering portion, respectively, the first triggering portion and the second triggering portion are respectively pressed to the first light blocking portion and the second light blocking portion toward the first wall and the third portion The wall swings. The fiber optic adapter of claim 1, wherein the body is formed with an opening, the inner casing further comprises: a cantilever; and a protrusion formed on the cantilever, the protrusion is trapped in the opening . The optical fiber adapter of claim 1, wherein the first wall and the third wall respectively form an opening, the inner casing further comprises: two cantilevers; and two protrusions respectively formed on the two cantilevers The two protrusions are respectively trapped in the two openings. The fiber optic adapter of claim 1, wherein the body is formed with two blocking blocks for restricting movement of the first connecting portion and the second connecting portion toward the second opening. The optical fiber adapter of claim 1, wherein the first light shielding portion is pressed against the second light shielding portion. The fiber optic adapter of claim 1, wherein the first triggering portion and the second triggering portion have a C-shaped cross section. The fiber optic adapter of claim 6, wherein the outer diameter of the cross section of the first trigger portion is greater than the outer diameter of the cross section of the second trigger portion. The fiber optic adapter of claim 1, wherein the first triggering portion and the second triggering portion are designed to be pressed when the first optical fiber connector is inserted into the body from the second opening. The first triggering portion. The fiber optic adapter of claim 1, wherein the fiber optic adapter is an MPO fiber optic adapter.