Connector connection structure

Abstract

In the present invention, when optical connectors （２ａ－１，２ａ－２） and an optical connector （２ｂ） are connected and the end surfaces of optical fibers （１ａ－１，１ａ－２） and optical fibers （１ｂ－１，１ｂ－２） are mutually connected, magnets （２１ｂ－１，２１ｂ－２，２２ｂ－１，２２ｂ－２） approach soft magnetic bodies （２１ａ－１，２１ａ－２） , thereby forming a magnetic circuit, the pathway of which is formed by the soft magnetic bodies （２１ａ－１，２１ａ－２） , the magnets （２１ｂ－１，２１ｂ－２，２２ｂ－１，２２ｂ－２） , and yokes (２４ｂ－１，２４ｂ－２）.

Description

[Technical Field]

[0001] The present invention relates to a technique for connecting connectors together, and more particularly to a connector connection structure that enables connection by magnetic force. [Background technology]

[0002] Data centers are hubs that accommodate large volumes of data traffic from both inside and outside the company, providing advanced network services 24 hours a day, 365 days a year, without interruption, while providing a variety of connections between servers and network devices. Optical fiber communication technology has been introduced to connect network devices in data centers, and multi-core optical connectors that connect multiple optical fibers together have also been widely adopted. Furthermore, network devices have introduced many multi-lane pluggable optical transceivers that require multi-core optical connectors, such as Ethernet® switches that can be equipped with optical transceivers of 100G to 800G standards.

[0003] Meanwhile, in recent discussions, there has been a particularly strong demand for lower costs and lower power consumption in network equipment, and expectations are particularly high for CPO (Co-Packaged Optics) in standardization discussions by the OIF (Optical Internetworking Forum). CPO is a technology that implements optical transceivers, which were previously installed in network equipment, within the network equipment. By implementing compact, low-power optical transceivers within network equipment, it is expected that the power consumption of network equipment will also be reduced.

[0004] When a large number of optical transceivers are installed in a network device, the wiring of an enormous number of optical fibers, with more than 1,000 cores, must be performed within the network device. The external height of the network device is relatively small, at 4.4 cm or 8.8 cm, and wiring must be performed within such a small housing.

[0005] Furthermore, multi-fiber optical connectors are actively and frequently used for the optical connectors required for optical connections inside network devices equipped with a huge number of optical fibers. In the market for multi-fiber optical connectors, the MPO (Multi-fiber Push-On) optical connector is the most common (see Non-Patent Document 1 and Non-Patent Document 2).

[0006] Figure 55 is a horizontal cross-sectional view of a conventional MPO optical connector before ferrule connection, and Figure 56 is a vertical cross-sectional view of the MPO optical connector in Figure 55. Figures 55 and 56 show a configuration that is intended for use in a multi-lane optical transceiver. Optical connector 101a is a receptacle whose position is fixed, and optical connector 101b is a plug that can be inserted into or removed from the receptacle.

[0007] The optical connectors 101a and 101b include MT ferrules 102a and 102b attached to the tips of multi-core optical fibers 100a and 100b, respectively. The MT ferrules 102a and 102b are formed with a plurality of microholes (not shown) into which the optical fibers 100a and 100b are inserted, and guide pin holes 103a and 103b for alignment.

[0008] When connecting optical connectors 101a and 101b, one guide pin 104 is inserted into each of two guide pin holes 103a of MT ferrule 102a of optical connector 101a, and these guide pins 104 are inserted into guide pin holes 103b of MT ferrule 102b of optical connector 101b.

[0009] Next, the end faces of the optical fibers 100a, 100b protruding from the connection end faces of the MT ferrules 102a, 102b are butted together, and the protruding optical fibers 100a, 100b are elastically deformed, thereby transitioning the multi-core optical fibers 100a, 100b to a state in which they are optically connected stably. In this series of connection operations, the mechanical load required to butt together the end faces of the optical fibers 100a, 100b is applied by a spring 105 provided in the optical connector 101b.

[0010] As described above, conventional MPO optical connectors achieve optical connection by the load generated by the contraction of the spring 105. The absolute value of this load generally has a linear relationship with the amount of deformation of the spring 105. To obtain a relatively large load, the spring 105 must be made longer. Therefore, conventional MPO optical connectors have a limit to how much the connector housing volume can be reduced to accommodate the long spring 105, making miniaturization difficult.

[0011] One method proposed to solve this problem is to introduce a clip, as shown in Figure 57. In the example of Figure 57, a clip 106 is fitted afterward into the mated MT ferrules 102a, 102b, thereby pressing the connecting end faces of the MT ferrules 102a, 102b together and bringing the end faces of the optical fibers 100a, 100b into close contact with each other. This configuration does not use a spring, so there is no need for a housing to accommodate the MT ferrule and spring, making it possible to miniaturize the optical connector.

[0012] 57, although it is possible to miniaturize the optical connector, the use of the metal-processed clip 106 may result in insufficient force pressing the end faces of the optical fibers 100a, 100b together, making it difficult to stably optically connect all of the optical fibers 100a, 100b. The problem of achieving stable optical connections is becoming more difficult to solve today as the number of cores in the optical fibers 100a, 100b tends to increase.

[0013] The above problems are not limited to optical connectors, but also occur in connectors for connecting electrical cables. [Prior art documents] [Non-patent literature]

[0014] [Non-Patent Document 1] “A Comprehensive Guide to MTP(R) Connector”, FS.COM, 2021,<https: / / community.fs.com / blog / a-comprehensive-guide-to-mtp-connector.html> [Non-patent document 2] Alexander Janta-Polczynski, “Efficient manufacturing for photonics / electronics co-packaging”, IBM Corporation, 2020, <https: / / www.dupont.com / content / dam / dupont / amer / us / en / ei-transformation / public / documents / WEBCAST-IBM-GF-Presentation-9.16.2020_vr2.pdf> Summary of the Invention [Problem to be solved by the invention]

[0015] The present invention has been made to solve the above-mentioned problems, and aims to provide a connector connection structure that allows stable connection even when the cable has a large number of cores. [Means for solving the problem]

[0016] The connector connection structure of the present invention comprises a first connector attached to the tip of a first cable and a second connector attached to the tip of a second cable and connectable to the first connector, the first connector comprising a first alignment part configured to fix the first cable and a first magnetic structure integrated with the first alignment part, the second connector comprising a second alignment part configured to fix the second cable, a second magnetic structure integrated with the second alignment part, and a third magnetic structure arranged around the second cable on a side farther from the first connector than the second magnetic structure, and the first magnetic The magnetic structure is made of a soft magnetic material, the second magnetic structure is made of a first magnet whose magnetization direction is set parallel to the longitudinal direction of the second cable, and the third magnetic structure is movable along the longitudinal direction of the second cable while the second cable is passed through a through hole, and when the first connector and the second connector are connected and the end faces of the first cable and the second cable are connected, the second magnetic structure and the third magnetic structure approach the first magnetic structure, forming a magnetic circuit with a path passing through the first magnetic structure, the second magnetic structure, and the third magnetic structure.

[0017] In addition, in one configuration example of the connector connection structure of the present invention, the second connector is characterized in that it further includes a fastener that fixes the position of the third magnetic structure so that the third magnetic structure approaches the first magnetic structure by being hooked onto the first magnetic structure when connected to the first connector. In addition, in one configuration example of the connector connection structure of the present invention, the second connector further comprises a fourth magnetic structure arranged around the second cable on a side farther from the first connector than the third magnetic structure, and a fastener that fixes the positions of the third magnetic structure and the fourth magnetic structure so that the third magnetic structure approaches the first magnetic structure when connected to the first connector by being caught on the first magnetic structure, and the fourth magnetic structure approaches the third magnetic structure, and the fourth magnetic structure consists of a second magnet whose magnetization direction is 180 degrees different from that of the first magnet, and is movable along the longitudinal direction of the second cable when the second cable is passed through the through hole of the second magnet.

[0018] Furthermore, one configuration example of the connector connection structure of the present invention is characterized in that the dimensions of the fastener are set so that a gap of a predetermined length is formed between the third magnetic structure and the fourth magnetic structure when the positions of the third magnetic structure and the fourth magnetic structure are fixed. In addition, in one configuration example of the connector connection structure of the present invention, the third magnetic structure is a yoke made of a soft magnetic material having a recess formed on its end face on the side of the first connector, and the yoke is movable along the longitudinal direction of the second cable with the second cable passed through a through hole, and when the end face of the yoke on the side of the first connector approaches the first magnetic structure when the first connector and the second connector are connected, the second magnetic structure is accommodated in the recess of the yoke, and a magnetic circuit is formed with a path passing through the first magnetic structure, the second magnetic structure, and the yoke.

[0019] In addition, in one configuration example of the connector connection structure of the present invention, the third magnetic structure comprises a yoke made of a soft magnetic material having a recess formed on its end surface facing the first connector, and a third magnet fixed to the yoke so as to be housed in the recess, the third magnet having the same magnetization direction as the first magnet and a stronger magnetic force than the first magnet, and is movable along the longitudinal direction of the second cable with the second cable passed through the through hole of the third magnet; when the end surface of the yoke facing the first connector approaches the first magnetic structure when the first connector and the second connector are connected, the second magnetic structure and the third magnet come into close contact, the second magnetic structure is housed in the recess of the yoke, and a magnetic circuit is formed with a path passing through the first magnetic structure, the second magnetic structure, the third magnet, and the yoke. In addition, in one configuration example of the connector connection structure of the present invention, the third magnet is attached so that its end opposite the first connector passes through the yoke, and the end of the third magnet is exposed on the end face of the yoke opposite the first connector.

[0020] Furthermore, one configuration example of the connector connection structure of the present invention further includes a guide pin for connecting the first connector and the second connector, wherein the first alignment part is a ferrule with a guide pin hole, and fixes the first cables so that the end faces of the multiple first cables are exposed at its connection end surface; the second alignment part is a ferrule with a guide pin hole, and fixes the second cables so that the end faces of the multiple second cables are exposed at its connection end surface; when connecting the first connector and the second connector, the guide pins are inserted into the guide pin holes of each of the first and second alignment parts, and the end faces of the first and second alignment parts are positioned so that they butt against each other. In one configuration example of the connector connection structure of the present invention, the first and second cables are optical fibers. [Effects of the Invention]

[0021] According to the present invention, when the first connector and the second connector are connected and the end faces of the first cable and the second cable are connected, the second magnetic structure and the third magnetic structure approach the first magnetic structure, forming a magnetic circuit with the first magnetic structure, the second magnetic structure, and the third magnetic structure as a path, so that a strong magnetic force can be generated that is sufficient to press the end faces of the first cable and the second cable together. As a result, with the present invention, a stable optical connection can be achieved even when the first cable and the second cable have a large number of cores. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a perspective view of a connector connection structure according to a first embodiment of the present invention before connection. [Figure 2] FIG. 2 is a perspective view of the connector connection structure according to the first embodiment of the present invention before connection. [Figure 3] FIG. 3 is a perspective view of the connector connection structure according to the first embodiment of the present invention before connection. [Figure 4] FIG. 4 is a perspective view of the connector connection structure according to the first embodiment of the present invention before connection. [Figure 5A-5B] 5A and 5B are side views of the connector connection structure according to the first embodiment of the present invention before connection. [Figure 6] FIG. 6 is a plan view of the connector connection structure according to the first embodiment of the present invention before connection. [Figure 7] FIG. 7 is a plan view of the connector connection structure according to the first embodiment of the present invention before connection. [Figure 8] FIG. 8 is a side view of a yoke and a magnet according to the first embodiment of the present invention. [Figure 9] FIG. 9 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 11]FIG. 11 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 12] FIG. 12 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figures 13A-13B] 13A and 13B are side views illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 14] FIG. 14 is a plan view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 15] FIG. 15 is a plan view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 16] FIG. 16 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 17] FIG. 17 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 18] FIG. 18 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 19] FIG. 19 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figures 20A-20B] 20A and 20B are side views illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 21] FIG. 21 is a plan view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 22] FIG. 22 is a plan view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 23] FIG. 23 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 24] FIG. 24 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 25]FIG. 25 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 26] FIG. 26 is a perspective view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figures 27A-27B] 27A and 27B are side views illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 28] FIG. 28 is a side view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 29] FIG. 29 is a plan view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 30] FIG. 30 is a plan view illustrating a connection procedure of the connector connection structure according to the first embodiment of the present invention. [Figure 31A-31B] 31A and 31B are vertical cross-sectional views showing magnetic flux density vectors of the connector connection structure according to the first embodiment of the present invention. [Figure 32] FIG. 32 is a vertical cross-sectional view showing magnetic flux density vectors of the connector connection structure according to the first embodiment of the present invention. [Figure 33] FIG. 33 is a perspective view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 34] FIG. 34 is a perspective view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 35] FIG. 35 is a perspective view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 36] FIG. 36 is a perspective view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 37] FIG. 37 is a plan view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 38] FIG. 38 is a perspective view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 39]FIG. 39 is a perspective view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 40] FIG. 40 is a plan view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 41] FIG. 41 is a perspective view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 42] FIG. 42 is a perspective view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 43] FIG. 43 is a plan view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 44] FIG. 44 is a perspective view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 45] FIG. 45 is a perspective view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 46] FIG. 46 is a plan view illustrating a procedure for disconnecting the connector connection structure according to the first embodiment of the present invention. [Figure 47] FIG. 47 is a perspective view of the connector connection structure according to the second embodiment of the present invention after connection. [Figure 48] FIG. 48 is a perspective view of the connector connection structure according to the second embodiment of the present invention after connection. [Figure 49] FIG. 49 is a perspective view of the connector connection structure according to the second embodiment of the present invention after connection. [Figure 50] FIG. 50 is a perspective view of the connector connection structure according to the second embodiment of the present invention after connection. [Figure 51A-51B] 51A and 51B are side views of the connector connection structure according to the second embodiment of the present invention after connection. [Figure 52] FIG. 52 is a perspective view of the connector connection structure according to the third embodiment of the present invention after connection. [Figure 53] FIG. 53 is a perspective view of the connector connection structure according to the third embodiment of the present invention after connection. [Figure 54A-54B] 54A and 54B are side views of the connector connection structure according to the third embodiment of the present invention after connection. [Figure 55] FIG. 55 is a horizontal cross-sectional view of a conventional MPO optical connector before ferrule connection. [Figure 56] FIG. 56 is a vertical cross-sectional view of a conventional MPO optical connector before ferrule connection. [Figure 57] FIG. 57 is a vertical cross-sectional view showing another form of a conventional MPO optical connector. DETAILED DESCRIPTION OF THE INVENTION

[0023] [First Example] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figures 1, 2, 3, and 4 are perspective views of a connector connection structure according to a first embodiment of the present invention before connection, Figures 5A and 5B are side views of the connector connection structure before connection, and Figures 6 and 7 are plan views of the connector connection structure before connection. Figures 2 and 4 show a perspective view of the top and side of the optical connector. Figure 5B shows a perspective view of the side of the optical connector. Figure 7 shows a perspective view of the top of the optical connector.

[0024] The connector connection structure of this embodiment is composed of optical connectors 2a-1 and 2a-2 (first connectors) attached to the ends of multiple optical fibers 1a-1 and 1a-2 (first cables), an optical connector 2b (second connector) attached to the ends of multiple optical fibers 1b-1 and 1b-2 (second cables), and guide pins 3-1 and 3-2 that connect the ferrules of the optical connectors 2a-1 and 2a-2 and the optical connector 2b. The optical connectors 2a-1 and 2a-2 are receptacles whose positions are fixed, and the optical connector 2b is a plug that can be inserted into or removed from the receptacle.

[0025] The optical connectors 2a-1, 2a-2 are composed of ferrules 20a-1, 20a-2 (first alignment components) attached to the tips of the optical fibers 1a-1, 1a-2, MIM (Metal Injection Molding) molded bodies 22a-1, 22a-2 attached around the ferrules 20a-1, 20a-2, and soft magnetic bodies 21a-1, 21a-2 (first magnetic structures) fixed to the end faces of the MIM molded bodies 22a-1, 22a-2 opposite the optical connector 2b so as to surround the optical fibers 1a-1, 1a-2.

[0026] The optical connector 2b includes ferrules 20b-1 and 20b-2 (second alignment components) attached to the tips of the optical fibers 1b-1 and 1b-2, magnets 21b-1 and 21b-2 (second magnetic structures) attached around the ferrules 20b-1 and 20b-2, and magnets 22b-1 and 22b-2 (second magnetic structures) arranged around the optical fibers 1b-1 and 1b-2 that are farther from the optical connectors 2a-1 and 2a-2 than the magnets 21b-1 and 21b-2. The optical connector 2b is made up of a magnetic structure (third magnetic structure), yokes 24b-1 and 24b-2 (third magnetic structure) attached to the magnets 22b-1 and 22b-2, a fastener 25 for fixing the optical connector 2b to the optical connectors 2a-1 and 2a-2, and magnets 26b-1 and 26b-2 (fourth magnetic structure) arranged around the optical fibers 1b-1 and 1b-2 on the side farther from the optical connectors 2a-1 and 2a-2 than the yokes 24b-1 and 24b-2.

[0027] The optical fibers 1a-1, 1a-2, 1b-1, and 1b-2 are each a multi-core optical fiber with 16 cores x 2 rows, although it goes without saying that the number of cores and the arrangement of the optical fibers do not have to be the same as in this embodiment.

[0028] The ferrules 20a-1, 20a-2, 20b-1, and 20b-2 are multi-fiber ferrules having a plurality of microholes into which the optical fibers 1a-1, 1a-2, 1b-1, and 1b-2 are inserted, respectively. Materials that can be used for the ferrules 20a-1, 20a-2, 20b-1, and 20b-2 include quartz glass, zirconia, ceramics, liquid crystal polymers, and engineering plastics such as resins containing silica particles.

[0029] The ferrules 20a-1, 20a-2, 20b-1, and 20b-2 are each formed with two guide pin holes 23a-1, 23a-2, 23b-1, and 23b-2 that penetrate the ferrules 20a-1, 20a-2, 20b-1, and 20b-2 along the longitudinal direction (Z-axis direction) of the optical fibers 1a-1, 1a-2, 1b-1, and 1b-2, respectively.

[0030] The optical fibers 1a-1 and 1a-2, each with their coating removed, are inserted into the microholes of the ferrules 20a-1 and 20a-2, respectively. Similarly, the optical fibers 1b-1 and 1b-2, each with their coating removed, are inserted into the microholes of the ferrules 20b-1 and 20b-2, respectively. The optical fibers 1a-1, 1a-2, 1b-1 and 1b-2 and the ferrules 20a-1, 20a-2, 20b-1 and 20b-2 are fixed together with an adhesive.

[0031] The optical fibers 1a-1 and 1a-2 are positioned so as to slightly protrude from the connection end faces of the ferrules 20a-1 and 20a-2 on the optical connector 2b side, respectively. Similarly, the optical fibers 1b-1 and 1b-2 are positioned so as to slightly protrude from the connection end faces of the ferrules 20b-1 and 20b-2 on the optical connector 2a-1 and 2a-2 side, respectively.

[0032] Through holes 29a-1 and 29a-2 are formed in the MIM bodies 22a-1 and 22a-2. The ferrules 20a-1 and 20a-2 are attached so as to fit into the through holes 29a-1 and 29a-2. The MIM bodies 22a-1 and 22a-2 are made of a soft magnetic material such as carbon steel, iron, nickel, Kovar, or SUS403. The ferrules 20a-1 and 20a-2 can be joined to the MIM bodies 22a-1 and 22a-2 by adhesive bonding or mechanical fitting. The connecting end faces of the ferrules 20a-1 and 20a-2 are positioned so as to slightly protrude from the end faces of the MIM bodies 22a-1 and 22a-2 on the optical connector 2b side.

[0033] The soft magnetic bodies 21a-1 and 21a-2 have through holes 24a-1 and 24a-2 formed along the Z-axis direction, through which the optical fibers 1a-1 and 1a-2 pass. The soft magnetic bodies 21a-1 and 21a-2 are made of a magnetic metal material such as carbon steel, iron, nickel, Kovar, or SUS403.

[0034] The width of the soft magnetic bodies 21a-1 and 21a-2 in the horizontal direction (X-axis direction) perpendicular to the longitudinal direction (Z-axis direction) of the optical fibers 1a-1, 1a-2, 1b-1, and 1b-2 is the same as the width of the MIM bodies 22a-1 and 22a-2. The soft magnetic bodies 21a-1 and 21a-2 are fixed to the end faces of the MIM bodies 22a-1 and 22a-2 opposite the optical connector 2b, with the optical fibers 1a-1 and 1a-2 passing through the through holes 24a-1 and 24a-2. The soft magnetic bodies 21a-1 and 21a-2 and the MIM bodies 22a-1 and 22a-2 can be joined by adhesive bonding, metal joining (soldering, etc.), or the like.

[0035] In addition, two guide pin holes 25a-1 and 25a-2 are formed in each of the soft magnetic bodies 21a-1 and 21a-2, which penetrate the soft magnetic bodies 21a-1 and 21a-2 along the Z-axis direction so as to communicate with the guide pin holes 23a-1 and 23a-2 of the ferrules 20a-1 and 20a-2.

[0036] The width of the magnets 21b-1, 21b-2 in the X-axis direction is the same as the width of the soft magnetic bodies 21a-1, 21a-2 and the MIM bodies 22a-1, 22a-2. Recesses 28b-1, 28b-2 are formed in the end faces of the magnets 21b-1, 21b-2 facing the optical connectors 2a-1, 2a-2. The ferrules 20b-1, 20b-2 are provided in these recesses 28b-1, 28b-2. The ferrules 20b-1, 20b-2 are positioned so that the connecting end faces of the ferrules 20b-1, 20b-2 slightly protrude from the end faces of the magnets 21b-1, 21b-2 facing the optical connectors 2a-1, 2a-2. The ferrules 20a-1, 20a-2 and the magnets 21b-1, 21b-2 can be joined by adhesive bonding, mechanical fitting, or other methods. Furthermore, the magnets 21b-1 and 21b-2 are formed with through holes 29b-1 and 29b-2 along the Z-axis direction, through which the optical fibers 1b-1 and 1b-2 pass.

[0037] The width of the yokes 24b-1, 24b-2 and the magnets 22b-1, 22b-2 in the X-axis direction is the same as the width of the magnets 21b-1, 21b-2. Figure 8 is a side view of the yoke 24b-1 and the magnet 22b-1. Through holes 30b-1, 30b-2 are formed in the yokes 24b-1, 24b-2. The magnets 22b-1, 22b-2 are attached to the yokes 24b-1, 24b-2 so that the ends opposite the optical connectors 2a-1, 2a-2 fit into the through holes 30b-1, 30b-2. The magnets 22b-1, 22b-2 and the yokes 24b-1, 24b-2 can be joined by adhesive bonding, metal joining (soldering, etc.), or the like.

[0038] The magnets 22b-1 and 22b-2 have through holes 31b-1 and 31b-2 formed along the Z-axis direction, through which the optical fibers 1b-1 and 1b-2 pass. The through holes 31b-1 and 31b-2 are sized to provide sufficient clearance for the optical fibers 1b-1 and 1b-2. This allows the magnets 22b-1 and 22b-2 and the yokes 24b-1 and 24b-2 to move along the Z-axis direction.

[0039] In addition, recesses 32b-1 and 32b-2 are formed on the end faces of the yokes 24b-1 and 24b-2 facing the optical connectors 2a-1 and 2a-2. As shown in Fig. 8, the magnets 22b-1 and 22b-2 are arranged so that their ends opposite the optical connectors 2a-1 and 2a-2 fit into the through holes 30b-1 and 30b-2 of the yokes 24b-1 and 24b-2, and their portions facing the optical connectors 2a-1 and 2a-2 are housed in the recesses 32b-1 and 32b-2.

[0040] The size of recesses 32b-1 and 32b-2 in the height direction (Y-axis direction) perpendicular to the Z-axis direction is set to a value greater than the height of magnets 21b-1, 21b-2, 22b-1, and 22b-2. Therefore, magnets 22b-1 and 22b-2 are housed in recesses 32b-1 and 32b-2 with a gap formed between them and yokes 24b-1 and 24b-2 in the Y-axis direction.

[0041] The depth of recesses 32b-1 and 32b-2 in the Z-axis direction is set to match the sum of the lengths of magnets 22b-1 and 22b-2 housed in recesses 32b-1 and 32b-2 in the Z-axis direction and magnets 21b-1 and 21b-2 in the Z-axis direction. Yokes 24b-1 and 24b-2 are made of a soft magnetic material such as carbon steel, iron, nickel, Kovar, or SUS403.

[0042] The fastener 25 is made of, for example, a non-magnetic metal, a liquid crystal polymer, an engineering plastic such as a resin mixed with silica particles, or an acrylic resin. Through holes 33b-1 and 33b-2 through which the optical fibers 1b-1 and 1b-2 pass are formed on the end face of the fastener 25 opposite the optical connectors 2a-1 and 2a-2. A hook 27 is formed on the tip of the fastener 25 on the optical connector 2a-1 and 2a-2 side to fix the positions of the yokes 24b-1 and 24b-2 and the magnets 26b-1 and 26b-2.

[0043] The width of the magnets 26b-1 and 26b-2 in the X-axis direction is equal to or less than the width of the yokes 24b-1 and 24b-2 and the magnets 21b-1, 21b-2, 22b-1, and 22b-2. The end faces of the magnets 26b-1 and 26b-2 opposite the optical connectors 2a-1 and 2a-2 are fixed to the fastener 25. Methods for joining the fastener 25 and the magnets 26b-1 and 26b-2 include adhesive bonding and mechanical fitting. The magnets 26b-1 and 26b-2 have through holes 34b-1 and 34b-2 formed in the Z-axis direction, through which the optical fibers 1b-1 and 1b-2 pass, so as to communicate with the through holes 33b-1 and 33b-2. The through holes 33b-1, 33b-2, 34b-1, and 34b-2 are set to have sufficient clearance for the optical fibers 1b-1 and 1b-2. Therefore, the fastener 25 and the magnets 26b-1 and 26b-2 are movable along the Z-axis direction.

[0044] As the magnets 21b-1, 21b-2, 22b-1, 22b-2, 26b-1, and 26b-2, permanent magnets such as ferrite magnets, samarium cobalt magnets, and neodymium magnets can be used.

[0045] In this embodiment, an example is described in which two pairs of optical connectors 2a-1, 2a-2 and optical connector 2b are connected. In order to suppress magnetic interference between the magnets around optical fibers 1a-1, 1a-2, 1b-1, and 1b-2, it is preferable that the soft magnetic materials 21a-1 and 21a-2, the MIM bodies 22a-1 and 22a-2, the magnets 21b-1 and 21b-2, the magnets 22b-1 and 22b-2, the yokes 24b-1 and 24b-2, and the magnets 26b-1 and 26b-2 are each arranged so that there is a predetermined gap of at least about 1 mm in the X-axis direction.

[0046] Next, the connection procedure for the optical connectors 2a-1, 2a-2 and the optical connector 2b will be described with reference to Figures 9 to 12, Figures 13A, 13B, 14, and 15. Figures 9 to 12 are perspective views illustrating the connection procedure for the optical connectors 2a-1, 2a-2 and the optical connector 2b, Figures 13A and 13B are side views illustrating the connection procedure, and Figures 14 and 15 are plan views illustrating the connection procedure. Figures 10 and 12 show a see-through view of the top and side of the optical connector. Figure 13B shows a see-through view of the side of the optical connector. Figure 15 shows a see-through view of the top of the optical connector.

[0047] As described above, the optical connectors 2a-1 and 2a-2 are receptacles whose positions are fixed, and the optical connector 2b is a plug that can be inserted into or removed from the receptacle. The worker performing the connection inserts the guide pins 3-1 one by one into the two guide pin holes 23a-1 of the ferrule 20a-1 of the optical connector 2a-1, and inserts the guide pins 3-2 one by one into the guide pin hole 23a-2 of the ferrule 20a-2 of the optical connector 2a-2. It is desirable to use a non-magnetic material for the guide pins 3-1 and 3-2.

[0048] The guide pin hole 23a-1 communicates with the guide pin hole 25a-1 of the soft magnetic body 21a-1, and the guide pin hole 23a-2 communicates with the guide pin hole 25a-2 of the soft magnetic body 21a-2. Therefore, the guide pin 3-1 is inserted into the guide pin holes 23a-1 and 25a-1, and the guide pin 3-2 is inserted into the guide pin holes 23a-2 and 25a-2.

[0049] When an operator brings optical connector 2b close to optical connectors 2a-1 and 2a-2, a magnetic force acts between soft magnetic materials 21a-1 and 21a-2 of optical connectors 2a-1 and 2a-2 and magnets 21b-1 and 21b-2 of optical connector 2b. The operator inserts guide pins 3-1 and 3-2 into guide pin holes 23b-1 and 23b-2 of ferrules 20b-1 and 20b-2 of optical connector 2b, and butts the end faces of ferrules 20a-1 and 20a-2 and ferrules 20b-1 and 20b-2 together, and butts the end faces of optical fibers 1a-1 and 1a-2 and optical fibers 1b-1 and 1b-2 together.

[0050] The positioning of the ferrules 20a-1, 20a-2 and ferrules 20b-1, 20b-2, i.e., the positioning of the optical fibers 1a-1, 1a-2 and optical fibers 1b-1, 1b-2, is performed by guide pins 3-1, 3-2. The positions of the guide pin holes 23b-1, 23b-2 in the ferrules 20b-1, 20b-2 and the fixing positions of the ferrules 20b-1, 20b-2 to the magnets 21b-1, 21b-2 are determined so that when the guide pins 3-1, 3-2 are inserted into the guide pin holes 23b-1, 23b-2, the end faces of the optical fibers 1a-1, 1a-2 and the optical fibers 1b-1, 1b-2 face each other and the positions of the soft magnetic bodies 21a-1, 21a-2, the MIM bodies 22a-1, 22a-2, and the magnets 21b-1, 21b-2 in the X-axis direction are aligned.

[0051] The magnets 21b-1 and 21b-2 of the optical connector 2b are magnets that are short in the Z-axis direction. Therefore, the magnets 21b-1 and 21b-2 alone cannot generate sufficient magnetic force to press the end faces of the optical fibers 1a-1 and 1a-2 and the end faces of the optical fibers 1b-1 and 1b-2 against each other.

[0052] Furthermore, the end faces of the ferrules 20a-1 and 20a-2 are positioned so as to protrude slightly from the end faces of the MIM bodies 22a-1 and 22a-2 on the optical connector 2b side, and the end faces of the ferrules 20b-1 and 20b-2 are positioned so as to protrude slightly from the end faces of the magnets 21b-1 and 21b-2 on the optical connector 2a-1 and 2a-2 side. Therefore, when the end faces of the ferrules 20a-1 and 20a-2 and the ferrules 20b-1 and 20b-2 come into contact with each other, a small gap is created between the MIM bodies 22a-1 and 22a-2 and the magnets 21b-1 and 21b-2.

[0053] The following procedure will be explained using Figures 16 to 19, Figures 20A, 20B, 21, and 22. Figures 16 to 19 are perspective views explaining the procedure for connecting optical connectors 2a-1, 2a-2 and optical connector 2b, Figures 20A and 20B are side views explaining the procedure, and Figures 21 and 22 are plan views explaining the procedure. Figures 17 and 19 show a see-through view of the top and side of the optical connector. Figure 20B shows a see-through view of the side of the optical connector. Figure 22 shows a see-through view of the top of the optical connector.

[0054] As described above, the magnets 22b-1 and 22b-2 and the yokes 24b-1 and 24b-2 can be moved along the Z-axis direction with the optical fibers 1b-1 and 1b-2 passing through the through holes 31b-1 and 31b-2 of the magnets 22b-1 and 22b-2. After bringing the end faces of the ferrules 20a-1 and 20a-2 and the ferrules 20b-1 and 20b-2 into contact with each other, the worker moves the magnets 22b-1 and 22b-2 and the yokes 24b-1 and 24b-2 along the Z-axis direction to bring them closer to the magnets 21b-1 and 21b-2.

[0055] The magnetization direction of the north and south poles of magnets 21b-1 and 21b-2 and the magnetization direction of magnets 22b-1 and 22b-2 are the same and are set to be parallel to the Z-axis direction. In addition, the magnetic force of magnets 22b-1 and 22b-2 is stronger than the magnetic force of magnets 21b-1 and 21b-2.

[0056] When the operator brings magnets 22b-1 and 22b-2 close to magnets 21b-1 and 21b-2, a magnetic attractive force acts between magnets 22b-1 and 22b-2 and magnets 21b-1 and 21b-2, bringing magnets 22b-1 and 22b-2 and magnets 21b-1 and 21b-2 into close contact. Because magnets 22b-1 and 22b-2 and magnets 21b-1 and 21b-2 are in close contact and yokes 24b-1 and 24b-2 are provided, a stronger magnetic attractive force can be generated than when magnets 21b-1 and 21b-2 are used alone, and a force can be obtained to press the end faces of optical fibers 1a-1 and 1a-2 and optical fibers 1b-1 and 1b-2 against each other.

[0057] As described above, the depth in the Z-axis direction of recesses 32b-1 and 32b-2 of yokes 24b-1 and 24b-2 is the same as the sum of the lengths in the Z-axis direction of the portions of magnets 22b-1 and 22b-2 housed in recesses 32b-1 and 32b-2 and the lengths of magnets 21b-1 and 21b-2. Therefore, when an operator brings magnets 22b-1 and 22b-2 close to magnets 21b-1 and 21b-2, MIM bodies 22a-1 and 22a-2 of optical connectors 2a-1 and 2a-2 come into contact with yokes 24b-1 and 24b-2 with magnets 22b-1 and 22b-2 and 21b-1 and 21b-2 housed in recesses 32b-1 and 32b-2.

[0058] The final step will be explained using Figures 23 to 26, Figures 27A, 27B, and Figures 28 to 30. Figures 23 to 26 are perspective views explaining the procedure for connecting optical connectors 2a-1, 2a-2 to optical connector 2b, Figures 27A, 27B, and 28 are enlarged side views of a portion of Figure 27A, and Figures 29 and 30 are plan views explaining the connection procedure. Figures 24 and 26 show a see-through view of the top and side of the optical connector. Figure 27B shows a see-through view of the side of the optical connector. Figure 28 shows the optical connector without the fastener 25. Figure 30 shows a see-through view of the top of the optical connector.

[0059] As described above, fastener 25 and magnets 26b-1, 26b-2 can be moved along the Z-axis direction with optical fibers 1b-1, 1b-2 passing through through holes 33b-1, 33b-2 of fastener 25 and through holes 34b-1, 34b-2 of magnets 26b-1, 26b-2. After bringing MIM molded bodies 22a-1, 22a-2 of optical connectors 2a-1, 2a-2 into contact with yokes 24b-1, 24b-2 of optical connector 2b, an operator moves fastener 25 and magnets 26b-1, 26b-2 along the Z-axis direction to approach yokes 24b-1, 24b-2.

[0060] The magnetization directions of the north and south poles of magnets 26b-1 and 26b-2 are 180 degrees apart from those of magnets 21b-1, 21b-2, 22b-1, and 22b-2. Therefore, when magnets 26b-1 and 26b-2 are brought closer to yokes 24b-1 and 24b-2, a repulsive force acts between magnets 26b-1 and 26b-2 and magnets 21b-1, 21b-2, 22b-1, and 22b-2. When the operator moves fastener 25 and magnets 26b-1 and 26b-2 closer to yokes 24b-1 and 24b-2 while resisting the repulsive force, hook 27 of fastener 25 engages with the end of soft magnetic material 21a-1 and 21a-2 opposite optical connector 2b. Thus, the position of optical connector 2b is fixed.

[0061] The length of fastener 25 in the Z-axis direction from the end of magnets 26b-1, 26b-2 opposite optical connectors 2a-1, 2a-2 to hook 27 is set to a value obtained by adding a predetermined length to the sum of the lengths of soft magnetic bodies 21a-1, 21a-2, MIM bodies 22a-1, 22a-2, yokes 24b-1, 24b-2, and magnets 26b-1, 26b-2. Therefore, when hook 27 is hooked onto the end of soft magnetic bodies 21a-1, 21a-2, a gap of a predetermined length (35 in FIG. 29) is formed between yokes 24b-1, 24b-2 and magnets 26b-1, 26b-2.

[0062] The changes in the magnetic circuit and magnetic force during the above connection procedure will be explained using Figures 31A, 31B, and 32. Figure 31A shows magnetic flux lines generated by soft magnetic materials 21a-1 and 21a-2 of optical connectors 2a-1 and 2a-2 and magnets 21b-1 and 21b-2 of optical connector 2b. Because the lengths of magnets 21b-1 and 21b-2 in the Z-axis direction are short and magnets 21b-1 and 21b-2 are surrounded by air, magnetic flux lines 50 are widely distributed throughout space.

[0063] Figure 31B shows magnetic flux lines generated when magnets 22b-1, 22b-2 and magnets 21b-1, 21b-2 are in close contact with each other. Magnets 22b-1, 22b-2 are integrated with yokes 24b-1, 24b-2. Therefore, when magnets 22b-1, 22b-2 and magnets 21b-1, 21b-2 are in close contact with each other, magnetic flux lines 51 do not leak out of yokes 24b-1, 24b-2. A magnetic circuit is formed through magnets 21b-1, 21b-2, 22b-1, 22b-2, yokes 24b-1, 24b-2, soft magnetic materials 21a-1, 21a-2, and MIM compacts 22a-1, 22a-2, and magnetic flux lines 51 are distributed to pass through the magnetic circuit as shown in Figure 31B.

[0064] As described above, the magnets 22b-1 and 22b-2 are attached so that their ends opposite the optical connectors 2a-1 and 2a-2 fit into the through-holes 30b-1 and 30b-2 of the yokes 24b-1 and 24b-2. The ends of the magnets 22b-1 and 22b-2 are exposed on the end faces of the yokes 24b-1 and 24b-2 opposite the optical connectors 2a-1 and 2a-2 (the right side in FIG. 31B). Magnetic flux lines 52 leak out from the ends of the magnets 22b-1 and 22b-2, as shown in FIG. 31B.

[0065] 32 shows the magnetic flux lines generated when magnets 26b-1 and 26b-2 approach yokes 24b-1 and 24b-2. The magnetization direction of magnets 26b-1 and 26b-2 differs by 180 degrees from the magnetization direction of magnets 21b-1, 21b-2, 22b-1, and 22b-2. Therefore, when magnets 26b-1 and 26b-2 approach yokes 24b-1 and 24b-2, a repulsive force acts between magnets 26b-1 and 26b-2 and magnets 21b-1, 21b-2, 22b-1, and 22b-2, and magnetic flux lines 53 generated by magnets 26b-1 and 26b-2 do not intersect with magnets 21b-1, 21b-2, 22b-1, and 22b-2.

[0066] Similarly, magnetic flux lines 52 generated by magnets 21b-1, 21b-2, 22b-1, and 22b-2 that are already integrated cannot intersect with magnetic flux lines 53 of magnets 26b-1 and 26b-2. Therefore, some of the magnetic flux lines 52 that had previously been distributed throughout space now use yokes 24b-1 and 24b-2 as a new route, generating magnetic flux lines 54 that pass through a magnetic circuit made up of magnets 21b-1, 21b-2, 22b-1, and 22b-2, yokes 24b-1 and 24b-2, soft magnetic bodies 21a-1 and 21a-2, and MIM bodies 22a-1 and 22a-2, as shown in FIG.

[0067] As the magnetic flux is increased compared to the magnetic flux lines 52 formed by magnets 21b-1, 21b-2, 22b-1, 22b-2 alone, the magnetic attraction acting between the soft magnetic materials 21a-1, 21a-2 of the optical connectors 2a-1, 2a-2 and the magnets 21b-1, 21b-2, 22b-1, 22b-2 of the optical connector 2b increases, and a sufficient load can be obtained to press the end faces of the optical fibers 1a-1, 1a-2 and the optical fibers 1b-1, 1b-2 against each other.

[0068] In the above connection procedure, when the end faces of the ferrules 20a-1, 20a-2 and ferrules 20b-1, 20b-2 are first brought into contact with each other, the impact caused when the end faces of the ferrules 20a-1, 20a-2 and ferrules 20b-1, 20b-2 come into contact with each other is suppressed by the weak magnetic force acting between the soft magnetic materials 21a-1, 21a-2 and the magnets 21b-1, 21b-2 and the frictional force acting between the guide pins 3-1, 3-2 and the guide pin holes 23b-1, 23b-2 of the ferrules 20b-1, 20b-2.

[0069] Finally, by bringing the magnets 26b-1 and 26b-2 closer to the yokes 24b-1 and 24b-2, the load pressing the end faces of the optical fibers 1a-1 and 1a-2 and the optical fibers 1b-1 and 1b-2 against each other increases, thereby realizing optical connection. In this embodiment, a sufficient load can be applied over the entire surfaces of the ferrules 20a-1, 20a-2, 20b-1, and 20b-2, so stable optical connection is possible even when the number of cores in the optical fibers 1a-1, 1a-2, 1b-1, and 1b-2 is large.

[0070] Next, the procedure for disconnecting the optical connectors 2a-1, 2a-2 from the optical connector 2b will be described with reference to Figures 33 to 46. Figures 33 to 36, 38, 39, 41, 42, 44, and 45 are perspective views explaining the procedure for disconnecting the optical connectors 2a-1, 2a-2 from the optical connector 2b, and Figures 37, 40, 43, and 46 are plan views explaining the procedure.

[0071] In this embodiment, in order to eliminate the formed magnetic circuit, release tools 4-1 and 4-2 shown in Figures 33 and 34 are prepared. The release tools 4-1 and 4-2 are made of soft magnetic material. Alternatively, magnets that are magnetized so as to be able to simultaneously attract magnets 22b-1, 22b-2, 26b-1, and 26b-2 may be used as the release tools 4-1 and 4-2.

[0072] Because handles are required for the operator to insert and remove the release tools 4-1 and 4-2, the height of the release tools 4-1 and 4-2 in the Y-axis direction must be greater than the height of the yokes 24b-1 and 24b-2 and the magnets 26b-1 and 26b-2. The width of the release tools 4-1 and 4-2 in the X-axis direction must be equal to or less than the width of the yokes 24b-1 and 24b-2. A notch 40 is formed at the tip of the release tools 4-1 and 4-2 to prevent collision with the optical fibers 1b-1 and 1b-2.

[0073] 35 and 36 show a state in which an operator inserts the release tool 4-1 between the yoke 24b-1 and the magnet 26b-1, and inserts the release tool 4-2 between the yoke 24b-2 and the magnet 26b-2. To facilitate insertion, it is desirable that the thickness of the release tools 4-1 and 4-2 in the Z-axis direction be equal to or less than the length of the gap between the yoke 24b-1 and 24b-2 and the magnet 26b-1 and 26b-2 in the Z-axis direction. As described above, the notch 40 is formed at the tip of the release tools 4-1 and 4-2, so that the release tools 4-1 and 4-2 do not collide forcefully with the optical fibers 1b-1 and 1b-2.

[0074] Inserting the release tools 4-1 and 4-2 between the yokes 24b-1 and 24b-2 and the magnets 26b-1 and 26b-2 changes the magnetic flux lines, and the magnetic circuits that run through the magnets 21b-1, 21b-2, 22b-1 and 22b-2, the yokes 24b-1 and 24b-2, the soft magnetic materials 21a-1 and 21a-2, and the MIM bodies 22a-1 and 22a-2 disappear, reducing the magnetic attractive force acting between the soft magnetic materials 21a-1 and 21a-2 of the optical connectors 2a-1 and 2a-2 and the magnets 21b-1, 21b-2, 22b-1 and 22b-2 of the optical connector 2b.

[0075] However, since the magnets 21b-1, 21b-2 and the magnets 22b-1, 22b-2 are in close contact with each other due to magnetic attraction, the magnets 21b-1, 21b-2 and the magnets 22b-1, 22b-2 cannot be separated from each other by simply inserting the release tools 4-1, 4-2.

[0076] Therefore, the worker pinches both sides of fastener 25 located next to magnets 21b-1, 21b-2, 22b-1, and 22b-2 with his or her fingertips, applies a load as indicated by arrow 41 in FIG. 37, and pulls optical connector 2b toward the opposite side from optical connectors 2a-1 and 2a-2 (to the right in FIG. 37) while rotating it around the Z axis. The positions of magnets 22b-1 and 22b-2 and yokes 24b-1 and 24b-2 in the XY plane are not fixed by guide pins 3-1 and 3-2. Therefore, by holding both sides of fastener 25, the worker can easily rotate magnets 22b-1 and 22b-2 and yokes 24b-1 and 24b-2 around the Z axis.

[0077] 37, the tip of fastener 25 bends back in a direction away from soft magnetic materials 21a-1 and 21a-2, and the fixation by hook portions 27 hooked on the ends of soft magnetic materials 21a-1 and 21a-2 is released. Therefore, it becomes possible to pull out the entire optical connector 2b to the side opposite optical connectors 2a-1 and 2a-2.

[0078] 38 to 40 show the state in which the optical connector 2b is pulled out. Due to the frictional force acting between the guide pins 3-1 and 3-2 and the guide pin holes 23b-1 and 23b-2 of the ferrules 20b-1 and 20b-2, the ferrules 20b-1 and 20b-2 and the magnets 21b-1 and 21b-2 remain on the optical connectors 2a-1 and 2a-2 side, and are separated from the magnets 22b-1 and 22b-2.

[0079] Next, the worker pulls out the release tools 4-1 and 4-2 that were inserted between the yokes 24b-1 and 24b-2 and the magnets 26b-1 and 26b-2. The state after the release tools 4-1 and 4-2 have been pulled out is shown in FIGS. 41 to 43. Because a repulsive force acts between the magnets 22b-1 and 22b-2 and the magnets 26b-1 and 26b-2, the magnets 22b-1 and 22b-2 (yokes 24b-1 and 24b-2) and the magnets 26b-1 and 26b-2 are separated from each other, as shown in FIGS. 41 to 43. In the state shown in FIGS. 41 to 43, the magnetic force acting between the soft magnetic materials 21a-1 and 21a-2 of the optical connectors 2a-1 and 2a-2 and the magnets 21b-1 and 21b-2 of the optical connector 2b is weak.

[0080] Finally, the worker pulls the magnets 21b-1 and 21b-2 of the optical connector 2b away from the optical connectors 2a-1 and 2a-2 to separate the ferrules 20a-1 and 20a-2 from the ferrules 20b-1 and 20b-2. This state is shown in Figures 44 to 46.

[0081] The above procedure allows the optical connectors 2a-1, 2a-2 and the optical connector 2b to be disconnected. In this embodiment, a stable optical connection can be achieved by the strong magnetic force when the optical connector 2b is fixed by the fastener 25. When the fixation by the fastener 25 is released and the magnets 22b-1, 22b-2 (yokes 24b-1, 24b-2) are separated from the magnets 26b-1, 26b-2, the magnetic force acting between the soft magnetic materials 21a-1, 21a-2 and the magnets 21b-1, 21b-2 becomes weak, and the connection between the optical connectors 2a-1, 2a-2 and the optical connector 2b can be easily disconnected.

[0082] [Second Example] Next, a second embodiment of the present invention will be described. Figures 47 to 50 are perspective views of a connector connection structure according to the second embodiment of the present invention after connection, and Figures 51A and 51B are side views of the connector connection structure after connection. Fastener 25 is omitted from Figures 48, 50, and 51B.

[0083] In the first embodiment, the optical connector 2b is provided with magnets 22b-1 and 22b-2 in order to obtain the load necessary to press the end faces of the optical fibers 1a-1 and 1a-2 and the optical fibers 1b-1 and 1b-2 together.

[0084] On the other hand, this embodiment shows an example in which the magnets 21b-1, 21b-2, 26b-1, and 26b-2 can generate a load sufficient to press the end faces of the optical fibers 1a-1 and 1a-2 and the optical fibers 1b-1 and 1b-2 against each other. For this reason, this embodiment does not include the magnets 22b-1 and 22b-2.

[0085] In this embodiment, when connecting the optical connectors 2a-1, 2a-2 and the optical connector 2b, the worker brings the optical connector 2b close to the optical connectors 2a-1, 2a-2, as in the first embodiment, and inserts the guide pins 3-1, 3-2 into the guide pin holes 23b-1, 23b-2 of the ferrules 20b-1, 20b-2 of the optical connector 2b, so that the end faces of the ferrules 20a-1, 20a-2 and the ferrules 20b-1, 20b-2 come into contact with each other.

[0086] Next, the worker moves the yokes 24b-1 and 24b-2 along the Z-axis direction to approach the magnets 21b-1 and 21b-2, thereby bringing the MIM bodies 22a-1 and 22a-2 of the optical connectors 2a-1 and 2a-2 into contact with the yokes 24b-1 and 24b-2, with the magnets 21b-1 and 21b-2 housed in the recesses 32b-1 and 32b-2 of the yokes 24b-1 and 24b-2.

[0087] Furthermore, the worker moves fasteners 25 and magnets 26b-1 and 26b-2 along the Z-axis direction to approach yokes 24b-1 and 24b-2 so that hooks 27 of fasteners 25 hook onto the ends of soft magnetic materials 21a-1 and 21a-2. In this way, the positions of yokes 24b-1 and 24b-2 and magnets 26b-1 and 26b-2 are fixed.

[0088] In this embodiment, magnets 22b-1 and 22b-2 are omitted, so a magnetic circuit is formed with magnets 21b-1 and 21b-2, yokes 24b-1 and 24b-2, soft magnetic materials 21a-1 and 21a-2, and MIM molded bodies 22a-1 and 22a-2 as its path. By bringing magnets 26b-1 and 26b-2 closer together, the magnetic flux passing through the magnetic circuit increases, and the magnetic attractive force acting between soft magnetic materials 21a-1 and 21a-2 of optical connectors 2a-1 and 2a-2 and magnets 21b-1 and 21b-2 of optical connector 2b increases.

[0089] In this embodiment, when disconnecting the optical connectors 2a-1, 2a-2 from the optical connector 2b, the worker inserts the release tool 4-1 between the yoke 24b-1 and the magnet 26b-1, and the release tool 4-2 between the yoke 24b-2 and the magnet 26b-2, as in the first embodiment.

[0090] Next, the worker pinches both side surfaces of fasteners 25 located beside yokes 24b-1 and 24b-2 with his / her fingertips, and while rotating optical connector 2b around the Z axis, pulls it toward the opposite side from optical connectors 2a-1 and 2a-2 to release it from fixation by hooks 27 hooked onto the ends of soft magnetic materials 21a-1 and 21a-2.The worker then pulls magnets 21b-1 and 21b-2 of optical connector 2b away from optical connectors 2a-1 and 2a-2.

[0091] [Third Example] Next, a third embodiment of the present invention will be described. Figures 52 and 53 are perspective views of a connector connection structure according to the third embodiment of the present invention after connection, and Figures 54A and 54B are side views of the connector connection structure after connection. Figures 52, 53, 54A, and 54B omit illustration of fastener 25. Also, Figure 53 shows a see-through view of the top and side surfaces of the optical connector. Figure 54B shows a see-through view of the side surface of the optical connector.

[0092] In this embodiment, the magnets 21b-1, 21b-2, 22b-1, and 22b-2 provide a load sufficient to press the end faces of the optical fibers 1a-1 and 1a-2 and the optical fibers 1b-1 and 1b-2 together, so the magnets 26b-1 and 26b-2 are omitted.

[0093] Because magnets 26b-1 and 26b-2 are not present, the end faces of yokes 24b-1 and 24b-2 opposite to optical connectors 2a-1 and 2a-2 are fixed to fastener 25. Through holes 31b-1 and 31b-2 of magnets 22b-1 and 22b-2 communicate with through holes 33b-1 and 33b-2 of fastener 25. In this embodiment, the length of fastener 25 in the Z-axis direction from the end of yokes 24b-1 and 24b-2 opposite to optical connectors 2a-1 and 2a-2 to hook portion 27 is set to the sum of the lengths of soft magnetic bodies 21a-1 and 21a-2, MIM bodies 22a-1 and 22a-2, and yokes 24b-1 and 24b-2.

[0094] In this embodiment, when connecting the optical connectors 2a-1, 2a-2 and the optical connector 2b, the worker brings the optical connector 2b close to the optical connectors 2a-1, 2a-2, as in the first embodiment, and inserts the guide pins 3-1, 3-2 into the guide pin holes 23b-1, 23b-2 of the ferrules 20b-1, 20b-2 of the optical connector 2b, so that the end faces of the ferrules 20a-1, 20a-2 and the ferrules 20b-1, 20b-2 come into contact with each other.

[0095] The worker moves fastener 25 and yokes 24b-1 and 24b-2 along the Z-axis direction to approach magnets 21b-1 and 21b-2 so that hook portion 27 of fastener 25 hooks onto the ends of soft magnetic materials 21a-1 and 21a-2.

[0096] In this embodiment, when disconnecting the optical connectors 2a-1 and 2a-2 from the optical connector 2b, the worker does not need to use the disconnection tools 4-1 and 4-2. The worker pinches both sides of the fasteners 25 located beside the yokes 24b-1 and 24b-2 with his or her fingertips, rotates the optical connector 2b around the Z axis, and pulls it toward the opposite side from the optical connectors 2a-1 and 2a-2 to release the fixation by the hooks 27 hooked on the ends of the soft magnetic materials 21a-1 and 21a-2. Then, the worker simply pulls the magnets 21b-1 and 21b-2 of the optical connector 2b away from the optical connectors 2a-1 and 2a-2.

[0097] In this embodiment, the fasteners 25 are not essential components. Because magnetic attraction acts between the magnets 21b-1, 21b-2 and the magnets 22b-1, 22b-2, it is possible to fix the optical connector 2b without fasteners.

[0098] In the first to third embodiments, an example is given in which two sets of optical connectors 2a-1, 2a-2 and an optical connector 2b are connected, so two sets of soft magnetic body 21a, MIM molded body 22a, magnets 21b, 22b, 26b, and yoke 24b are provided, but it is also possible to provide one receptacle and one plug, and one set of soft magnetic body 21a, MIM molded body 22a, magnets 21b, 22b, 26b, and yoke 24b.

[0099] Furthermore, in the first to third embodiments, the ferrules 20a-1 and 20a-2 are attached to the MIM bodies 22a-1 and 22a-2, but the MIM bodies 22a-1 and 22a-2 are not essential components, and the MIM bodies 22a-1 and 22a-2 may be omitted. In this case, for example, a recess may be formed in the end face of the soft magnetic bodies 21a-1 and 21a-2 on the optical connector 2b side, the ferrules 20a-1 and 20a-2 may be provided in this recess, and the ferrules 20a-1 and 20a-2 may be positioned so that the connection end faces thereof slightly protrude from the end faces of the soft magnetic bodies 21a-1 and 21a-2 on the optical connector 2b side.

[0100] Furthermore, in the first to third embodiments, exterior components of the optical connector are not explicitly stated, but it goes without saying that exterior components may be provided as appropriate. Furthermore, although the first to third embodiments have been described with reference to examples in which optical fibers are connected to each other, the present invention can also be applied to connectors for connecting electrical cables. When applying the present invention to a connector for connecting electrical cables, the optical connectors of the first to third embodiments can be replaced with connectors, and the optical fibers can be replaced with cables. [Industrial Applicability]

[0101] The present invention can be applied to techniques for connecting connectors. [Explanation of symbols]

[0102] 1a-1, 1a-2, 1b-1, 1b-2... Optical fiber, 2a-1, 2a-2, 2b... Optical connector, 3-1, 3-2... Guide pin, 4-1, 4-2... Release tool, 20a-1, 20a-2, 20b-1, 20b-2... Ferrule, 21a-1, 21a-2... Soft magnetic material, 21b-1, 21b-2, 22b-1, 22b-2, 26b-1, 26b-2... Magnet, 22a-1, 22a-2... MIM molding Body, 23a-1, 23a-2, 25a-1, 25a-2...guide pin holes, 24b-1, 24b-2...yoke, 25...fastener, 27...hook portion, 28b-1, 28b-2, 32b-1, 32b-2...recesses, 24a-1, 24a-2, 29a-1, 29a-2, 29b-1, 29b-2, 30b-1, 30b-2, 31b-1, 31b-2, 33b-1, 33b-2, 34b-1, 34b-2...through holes.

Claims

1. a first connector attached to the tip of the first cable; a second connector attached to a tip of a second cable and connectable to the first connector; The first connector includes: a first alignment component configured to secure the first cable; a first magnetic structure integral with the first alignment component; The second connector includes: a second alignment component configured to secure the second cable; a second magnetic structure integral with the second alignment piece; a third magnetic structure disposed around the second cable on a side farther from the first connector than the second magnetic structure, the first magnetic structure is made of a soft magnetic material; the second magnetic structure comprises a first magnet whose magnetization direction is set parallel to the longitudinal direction of the second cable; the third magnetic structure is movable along a longitudinal direction of the second cable with the second cable passing through the through hole; A connector connection structure characterized in that when the first connector and the second connector are connected and the end faces of the first cable and the second cable are connected, the second magnetic structure and the third magnetic structure come close to the first magnetic structure, forming a magnetic circuit with a path passing through the first magnetic structure, the second magnetic structure, and the third magnetic structure.

2. 2. The connector connection structure according to claim 1, A connector connection structure characterized in that the second connector further comprises a fastener that fixes the position of the third magnetic structure so that the third magnetic structure approaches the first magnetic structure by being caught on the first magnetic structure when connected to the first connector.

3. 2. The connector connection structure according to claim 1, The second connector includes: a fourth magnetic structure disposed around the second cable on a side farther from the first connector than the third magnetic structure; and a fastener for fixing the positions of the third magnetic structure and the fourth magnetic structure such that the third magnetic structure approaches the first magnetic structure and the fourth magnetic structure approaches the third magnetic structure by being caught on the first magnetic structure when connected to the first connector; A connector connection structure characterized in that the fourth magnetic structure consists of a second magnet whose magnetization direction is 180 degrees different from that of the first magnet, and is movable along the longitudinal direction of the second cable while the second cable is passed through a through hole of the second magnet.

4. 4. The connector connection structure according to claim 3, A connector connection structure characterized in that the dimensions of the fastener are set so that a gap of a predetermined length is formed between the third magnetic structure and the fourth magnetic structure when the positions of the third magnetic structure and the fourth magnetic structure are fixed.

5. The connector connection structure according to any one of claims 1 to 4, the third magnetic structure is a yoke made of a soft magnetic material and having a recess formed on an end surface on the side of the first connector, the yoke is movable along a longitudinal direction of the second cable with the second cable passing through the through hole; A connector connection structure characterized in that when the end face of the yoke on the first connector side approaches the first magnetic structure when the first connector and the second connector are connected, the second magnetic structure is accommodated in a recess of the yoke, and a magnetic circuit is formed with a path passing through the first magnetic structure, the second magnetic structure, and the yoke.

6. The connector connection structure according to any one of claims 1 to 4, The third magnetic structure comprises: a yoke made of a soft magnetic material having a recess formed on an end surface on the side of the first connector; a third magnet that is fixed to the yoke so as to be accommodated in the recess, that has the same magnetization direction as the first magnet but a stronger magnetic force than the first magnet, and that is movable along the longitudinal direction of the second cable with the second cable passing through a through hole of the third magnet; A connector connection structure characterized in that when the end face of the yoke on the first connector side approaches the first magnetic structure when the first connector and the second connector are connected, the second magnetic structure and the third magnet come into close contact, the second magnetic structure is accommodated in a recess in the yoke, and a magnetic circuit is formed with a path passing through the first magnetic structure, the second magnetic structure, the third magnet, and the yoke.

7. 7. The connector connection structure according to claim 6, A connector connection structure characterized in that the third magnet is attached so that its end opposite the first connector passes through the yoke, and the end of the third magnet is exposed on the end face of the yoke opposite the first connector.

8. 2. The connector connection structure according to claim 1, further comprising a guide pin for connecting the first connector and the second connector; the first alignment component is a ferrule having a guide pin hole, and fixes the first cables so that end faces of the plurality of first cables are exposed on a connection end face of the ferrule; the second alignment component is a ferrule having a guide pin hole, and fixes the second cables so that end faces of the plurality of second cables are exposed on a connection end face of the ferrule; A connector connection structure characterized in that, when the first connector and the second connector are connected, the guide pin is inserted into each guide pin hole of the first and second alignment parts, and the end faces of the first and second alignment parts are positioned so as to abut against each other.

9. 2. The connector connection structure according to claim 1, A connector connection structure characterized in that the first and second cables are optical fibers.

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