Patent Application
20220320775
The present invention relates to connectors and wiring structures mainly used for wiring in mobile communication apparatuses.
The next-generation (fifth generation, 5G) mobile communication system is being realized. Various coaxial cables and connectors for use in wiring in the mobile communication apparatuses are proposed (see Patent Literature (hereinafter, abbreviated as PTL) 1, for example).
It is expected for the next generation that not only smartphones but also notebook personal computers are used as mobile communication apparatuses. However, using an antenna module for smartphones for mobile communication apparatuses other than smartphones is desired. For this reason, a method for connecting the antenna module for smartphones to the circuit board of notebook personal computers is under consideration.
Furthermore, the next generation uses frequency bands higher than existing frequency bands. However, the higher frequency bands increase in radio-wave propagation loss. For this reason, antenna modules for the next generation are required to satisfy various strict conditions, such as antenna directivity. For the next-generation antenna modules with many restrictions, a wiring material for electrical connection can desirably be selected from a plurality of wiring materials. For example, if the distance between a circuit board and an antenna module is long, connecting them with a flexible printed board causes problems in cost and provision of sufficient wiring lines. When the distance between the circuit board and the antenna module is long, it is suitable to connect them with a coaxial cable. In contrast, if the distance between the circuit board and the antenna module is short, and the mobile communication apparatus main body is thin in thickness, it is suitable to connect them with a flexible printed board. Thus, it is desirable to allow for selecting an optimum transmission path between the circuit board and the next-generation antenna module so that the next-generation antenna modules with strict restrictions can be mounted to various kinds and shapes of mobile communication apparatuses.
An object of the present invention is to provide a connector and a wiring structure with which a module board of one mobile communication apparatus can be connected to a circuit board of another kind of mobile communication apparatus using an optimal wiring material.
A connector of the present invention is to be fitted to a mating connector mounted on a module board in a direction perpendicular to a surface of the module board, the mating connector including a first connection terminal and a second connection terminal each having a contact point exposed in a same direction and arranged in parallel, and a third connection terminal having a contact point exposed in a direction opposite to the same direction and arranged in parallel with the first connection terminal and the second connection terminal, the connector including: a first contact including, at one end, a core-wire connecting portion connected to a core wire of a coaxial cable and, at another end, a first contact portion that is to be connected to the first connection terminal of the mating connector when the connector is fitted to the mating connector; a second contact including, at one end, a shield connecting portion connected to an external shield of the coaxial cable and, at another end, a second contact portion that is to be connected to the second connection terminal of the mating connector when the connector is fitted to the mating connector, the second contact being to be connected to a gland of the module board via the second connection terminal of the mating connector; and a third contact including, at one end, an electrical-wire connecting portion connected to an electrical wire forming a circuit different from the coaxial cable and, at another end, a third contact portion that is to be connected to the third connection terminal of the mating connector when the connector is fitted to the mating connector.
In the connector of the present invention, the mating connector is fittable to a connector mounted on a flexible printed board.
Further, the connector of the present invention includes: a first shielding plate that is directly or indirectly connected to the external shield of the coaxial cable and that shields at least part between the first contact and the third contact, in which the first shielding plate is directly or indirectly connected to the gland of the module board.
Further, the connector of the present invention includes: a second shielding plate that is directly or indirectly connected to the external shield of the coaxial cable and that shields at least part of the first contact outside a direction in which the first contact and the third contact are arranged, in which the second shielding plate is directly or indirectly connected to the gland of the module board.
Further, the connector of the present invention includes: a third shielding plate that is directly or indirectly connected to the external shield of the coaxial cable and that shields at least part of the first contact on one side or opposite sides in a direction in which the first contact and the second contact are arranged, in which the third shielding plate is directly or indirectly connected to the gland of the module board.
Further, in the connector of the present invention, a direction in which the coaxial cable is inserted in the connector is a direction along a direction perpendicular to a fitting direction in which the connector is fitted to the mating connector.
Further, in the connector of the present invention, the coaxial cable is inserted closer to a fitting portion that is fitted to the mating connector than the electrical wire.
Further, in the connector of the present invention, the electrical wire is inserted closer to a fitting portion that is fitted to the mating connector than the coaxial cable.
Further, a wiring structure of the present invention includes: a main board; a first module board; a first connector fittable to a connector that is mounted on a coaxial cable connector and a flexible printed board, the first connector being mounted on or above the first module board; a second connector to be fitted to the first connector; and a wiring material attached to the second connector and electrically connecting the main board and the first module board to each other.
Further, the wiring structure of the present invention further includes: an electrical wire attached to the second connector and electrically connecting the main board and the first module board to each other, in which a first circuit formed by the wiring material and a second circuit formed by the electrical wire are different circuits.
Further, in the wiring structure of the present invention, the main board and the wiring material are electrically connected to each other via a second module board mounted on the main board.
Further, in the wiring structure of the present invention, the wiring material is disposed at a hinge of a portable electronic device that houses the wiring structure.
Further, in the wiring structure of the present invention, the wiring material is a coaxial cable or a flexible printed board.
Further, in the wiring structure of the present invention, the first module board is a communication module board for a smartphone.
The present invention provides a connector and a wiring structure with which a circuit board of one mobile communication apparatus can be connected to a module board of another kind of mobile communication apparatus using an optimal wiring material.
A wiring structure and a plug connector included in the wiring structure according to Embodiment 1 of the present invention will be described hereinbelow with reference to the drawings.
Circuit board 2 of the personal computer is provided with expansion card (a Wi-Fi module board, a multicard connector, a multicard slot, for example, M.2) 4, which is a second module board. Expansion card 4 connects to two coaxial cables 6a and 6b and four coaxial cables (not shown). In other words, circuit board 2 and coaxial cables 6a and 6b are electrically connected via expansion card 4 mounted on circuit board 2. Antenna module board 8 for a smartphone and two antenna module boards (not shown) catch radio waves from different three directions. Coaxial cables 6a and 6b are connected to antenna module board 8 via plug connector 10 and receptacle connector 12 (see
Circuit board 2 is provided with five electrical wires 14a to 14e. Five electrical wires 14a to 14e are connected to antenna module board 8 via plug connector 10 and receptacle connector 12. In other words, electrical wires 14a to 14e electrically connect circuit board 2 and antenna module board 8 via plug connector 10 and receptacle connector 12.
A first circuit formed by coaxial cables 6a and 6b according to Embodiment 1 is a communication circuit, and a second circuit formed by electrical wires 14a to 14e is a power supply circuit or a control circuit. The first circuit and the second circuit are different circuits. The second circuit only has to be different from the first circuit and is not limited to the power supply circuit and the control circuit. Coaxial cables 6a and 6b and electrical wires 14a to 14e are disposed at a hinge of a personal computer housing wiring structure 1.
In Embodiment 1, antenna module board 8 is described as an example of a module board. The module board may be another module board other than antenna module board 8, for example, a camera module board or a liquid crystal display (LCD) module board.
In the following description, the XYZ orthogonal coordinate system shown in
Receptacle connector 12 is a connector mounted on antenna module board 8 in advance and can be fitted to a connector (see
Plug connector 10 is fitted to receptacle connector 12 in the direction crossing (perpendicular to) the surface of antenna module board 8. Plug connector 10 includes two housings 16a and 16b, two first contacts 18a and 18b, gland fitting 22, housing 24, five third contacts 26a to 26e, and housing 28.
Housings 16a and 16b are insulators, such as resin. One first contact 18a is a conductor, such as metal, which is built in one housing 16a, and includes a core-wire connecting portion that is electrically connected to the core wire of coaxial cable 6a at one end (on the +Z direction side). At the other end (on the −Z direction side) of first contact 18a, a first contact portion that is electrically connected to mating contact 30a (a first connection terminal, see
The other first contact 18b is a conductor, such as metal, which is built in the other housing 16b, and includes a core-wire connecting portion that is electrically connected to the core wire of coaxial cable 6b at one end (+Z direction). At the other end (−Z direction) of first contact 18b, a first contact portion that is electrically connected to mating contact 30e (first connection terminal, see
Gland fitting 22 is a conductor, such as metal, and includes shield connecting portions that electrically connect to respective external shields 36a and 36b of coaxial cables 6a and 6b at one end (+Z direction) of gland fitting 22. Gland fitting 22 includes, at the other end (in the −Z direction), second contact portion 20 that is electrically connected to mating contacts 30b to 30d (second connection terminals, see
Gland fitting 22 includes shielding plates (first shielding plates) 21. Shielding plates 21 have a surface along a plane parallel to the Y-Z plane to shield at least part (part or the whole) between first contacts 18a and 18b and third contacts 26a to 26e. In other words, shielding plates 21 connect indirectly to external shields 36a and 36b of coaxial cables 6a and 6b via gland fitting 22 and connects to the gland of antenna module board 8 via gland fitting 22 and shell 34 of receptacle connector 12. This configuration can strengthen the gland. Gland fitting 22 is built in housing 24, which is an insulator, such as resin
Gland fitting 22 includes shielding plates (third shielding plates) 23a and 23b. Shielding plates 23a and 23b each have a surface along a plane parallel to the Z-X plane. Shielding plate 23a shields at least part (part or the whole) of first contact 18a in the direction (−Y direction) in which first contacts 18a and 18b and second contact portion 20 (second contact) are arranged. Shielding plate 23b shields at least part (part or the whole) of second contact 18b in the direction (+Y direction) in which first contacts 18a and 18b and second contact portion 20 (second contact) are arranged. In other words, shielding plates 23a and 23b connect indirectly to external shields 36a and 36b of coaxial cables 6a and 6b via gland fitting 22 and connect to the gland of antenna module board 8 via gland fitting 22 and shell 34 of receptacle connector 12. This configuration can strengthen the gland.
Shielding plates 21, 23a, and 23b may be connected directly to external shields 36a and 36b or may be connected directly to the gland of antenna module board 8. It is second contact portion 20 (second contact) that functions as a shielding plate that shields at least part (part or the whole) of first contact 18a on the +Y direction side and a shielding plate that shields at least part (part or the whole) of first contact 18b on the −Y direction side.
First contacts 18a and 18b and second contact portion 20 (second contact) are arranged in parallel in the Y direction. Specifically, first contact 18a, second contact portion 20, first contact 18b are arranged in this order from the −Y direction. In other words, second contact portion 20 (second contact) is disposed between coaxial cable 6a (first contact 18a) and coaxial cable 6b (first contact 18b). This configuration can strengthen the gland. Mating contacts 30a to 30e of receptacle connector 12 have contact points exposed in the same direction (+X direction) and are disposed in parallel from the −Y direction side.
Third contacts 26a to 26e are conductors, such as metal, are built in housing 24, and each include, at one end, an electrical-wire connecting portion that electrically connects to corresponding one of electrical wires 14a to 14e. Third contacts 26a to 26e each include, at the other end, a third contact portion that is electrically connected to corresponding one of mating contacts 38a to 38e (third connection terminals, see
Mating contacts 30a to 30e are arranged in parallel with mating contacts 38a to 38e, have the same shape, and are mounted on the surface of antenna module board 8. Mating contacts 38a to 38e have a line-symmetrically identical in shape to mating contacts 30a to 30e and are mounted on the surface of antenna module board 8. The portion of mating contact 30a that is to come into contact with first contact 18a has a spring shape. This portion pushes the contact portion of first contact 18a using the spring force to ensure connection to first contact 18a. Likewise, the portions of mating contacts 30b to 30e and 38a to 38e that are to come into contact with first contact 18b, second contact portion 20, and third contacts 26a to 26e have a spring shape. These portions push the contact portions of first contact 18b, second contact portion 20, and third contacts 26a to 26e using the spring force to ensure connection to first contact 18b, second contact portion 20, and third contacts 26a to 26e. In this embodiment, mating contacts 30b to 30e and 38a to 38e have a spring shape. Alternatively, the contact portions of first contacts 18a and 18b, second contact portion 20, and the contact portions of third contacts 26a to 26e may have a spring shape.
The array of first contacts 18a and 18b and second contact portion 20 and the array of third contacts 26a to 26e are disposed in parallel in the X direction. This allows for connecting to all signals necessary for antenna module board 8 only with plug connector 10. The contact portions of first contacts 18a and 18b that are to be connected to mating contacts 30a and 30e, second contact portion 20, and the contact portions of third contacts 26a to 26e to be connected to mating contacts 38a to 38e face each other. Housing 28 is a conductor, such as resin, which is fixed to housing 24, with third contacts 26a to 26e and electrical wires 14a to 14e disposed between the housing 28 and housing 24.
First contacts 18a and 18b are enclosed in all directions by shielding plates 21, 23a, and 23b, gland fitting 22, and second contact portion 20, which are indirectly connected to the gland of antenna module board 8. This configuration allows for appropriately transmitting high-speed signals with the impedance of first contacts 18a and 18b and the impedance of coaxial cables 6a and 6b matched.
The direction in which coaxial cables 6a and 6b and electrical wires 14a to 14e are inserted in plug connector 10 is the −X direction. This is a direction perpendicular to the fitting direction (Z direction) in which plug connector 10 and receptacle connector 12 are fitted or a direction along the perpendicular direction. Coaxial cables 6a and 6b are inserted closer to the fitting side on which plug connector 10 is fitted to receptacle connector 12 than the electrical wires 14a to 14e, in other words, adjacent to antenna module board 8 (−Z direction).
Embodiment 1 has been described using plug connector 10, which is a connector for electrical wires and coaxial cables (an electrical wire+coaxial cable complex connector) by way of example. Alternatively, a board-to-board connector (B-to-B connector), a board-to-board connector mounted on a flexible printed board (B-to-B on FPC), or a board-to-electrical-wire connector, other than plug connector 10, may be fitted to receptacle connector 12. In other words, for next-generation antenna modules with many restrictions, wiring materials for electrical connection are desirably selected from a plurality of wiring materials. In this embodiment, an optimum wiring material (transmission path) for circuit board 2 and antenna module board 8 can be selected so that antenna module board 8 can be mounted to various types and shapes of mobile communication apparatus.
For example, if a wiring material to be connected to plug connector 10 is only an electrical wire, plug connector 10 is a board-to electrical wire connector. Instead of plug connector 10, plug connector 40 shown in
Plug connector 40 is mounted on flexible printed board 42 and includes housing 44, ten contacts 46a to 46e and 50a to 50e, and shell 52. flexible printed board 42 is disposed at a hinge of personal computer. Contacts 46a to 46e and 50a to 50e are built in housing 44. When receptacle connector 12 and plug connector 40 are fitted, contacts 46a to 46e are electrically connected to mating contacts 30a to 30e of receptacle connector 12, respectively. Likewise, when receptacle connector 12 and plug connector 40 are fitted, contacts 50a to 50e are electrically connected to mating contacts 38a to 38e of receptacle connector 12, respectively. When receptacle connector 12 and plug connector 40 are fitted, shell 52 mounted on the surface of flexible printed board 42 is electrically connected to shell 34 mounted on the surface of antenna module board 8. In other words, flexible printed board 42 is connected to the gland of antenna module board 8 via shell 52 and shell 34.
Contacts 46a to 46e are arranged in order from the −Y direction side. Contacts 50a to 50e are arranged in order from the −Y direction side. The array of contacts 46a to 46e and the array of contacts 50a to 50e are disposed in parallel in the X direction. The contact portions of contacts 46a to 46e to be connected to mating contacts 30a to 30e and the contact portions of contacts 50a to 50e to be connected to mating contacts 38a to 38e face each other.
Instead of plug connector 10 according to Embodiment 1, a plug connector (electrical wire+coaxial cable complex connector) 54 shown in
Plug connector 54 includes first contacts 31a and 31b, gland fitting 32, housing 33, upper shell 47, middle shell 48, under shell 49, five third contacts 34a to 34e, and housing 35. First contacts 31a and 31b are conductors, such as metal, built in housing 33, and each include a core-wire connecting portion that electrically connects to corresponding one of the core wires of coaxial cables 6a and 6b and a first contact portion that is electrically connected to corresponding one of mating contacts 30a and 30e of receptacle connector 12.
Gland fitting 32 is a conductor, such as metal, which is built in housing 65 and connects to middle shell 48. Gland fitting 32 has second contact portion 37 to be electrically connected to mating contacts 30b to 30d of receptacle connector 12.
Upper shell 47 is a conductor, such as metal, and electrically connects to the external shields of electrical wires 14a to 14e. Middle shell 48 and under shell 49 are conductors, such as metal, and electrically connect to external shields 36a and 36b of coaxial cables 6a and 6b. Middle shell 48, under shell 49, and second contact portion 37 function as second contacts to be connected to the gland of antenna module board 8 via mating contacts 38b to 38d.
Upper shell 47 and middle shell 48 connect to each other. Middle shell 48 and under shell 49 connect to each other. Middle shell 48 is electrically connected to shell 34 of receptacle connector 12. Accordingly, external shields 36a and 36b of coaxial cables 6a and 6b are connected to the gland of antenna module board 8 via gland fitting 32, upper shell 47, middle shell 48, under shell 49, and shell 34 of receptacle connector 12.
Third contacts 34a to 34e are conductors, such as metal, which are built in housing 35. Third contacts 34a to 34e have, at one end, electrical-wire connecting portions that electrically connect to electrical wires 14a to 14e, respectively. Third contacts 34a to 34e have, at the other end, third contact portions to be electrically connected to mating contacts 38a to 38e of receptacle contact 12. The direction in which coaxial cables 6a and 6b and electrical wires 14a to 14e are inserted in plug connector 54 is the −X direction, which is a direction perpendicular to the fitting direction (Z direction) in which plug connector 54 and receptacle connector 12 are fitted or a direction along the perpendicular direction. Plug connector 54 can enhance processability and mass production efficiency.
Next, a wiring structure according to Embodiment 2 of the present invention will be described with reference to the drawings. In the wiring structure according to Embodiment 2, the configuration other than that of plug connector 10 is the same as the configuration of the wiring structure according to Embodiment 1 shown in
As shown in
First contacts 60a and 60b are conductors, such as metal, which are built in housing 65. First contact 60a has, at one end 67a, a core-wire connecting portion that electrically connects to the core wire of coaxial cable 6a. First contact 18a has, at the other end 68a, a first contact portion to be electrically connected to mating contact (first connection terminal) 38a of receptacle connector 12 when receptacle connector 12 and plug connector 55 are fitted. Likewise, first contact 60b has, at one end 67b, a core-wire connecting portion that electrically connects to the core wire of coaxial cable 6b, and first contact 60b has, at the other end 68b, a first contact portion to be electrically connected to mating contact (first connection terminal) 38e of receptacle connector 12 when receptacle connector 12 and plug connector 10 are fitted.
Gland fitting 61 is a conductor, such as metal, which is built in housing 65, which is an insulator, such as resin. Gland fitting 61 connects to upper shell 69, which is a conductor, such as metal. Upper shell 69 connects to middle shell 59, which is a conductor, such as metal, and to under shell 70, which is a conductor, such as metal. Upper shell 69 has shield connecting portions 72a and 72b that electrically connect to external shields 36a and 36b of coaxial cables 6a and 6b. Likewise, middle shell 59 has shield connecting portions 71a and 71b that electrically connect to external shields 36a and 36b of coaxial cables 6a and 6b.
Gland fitting 61 has a second contact portion 66 that is electrically connected to mating contacts (second connection terminals) 38b to 38d of receptacle connector 12 when receptacle connector 12 and plug connector 55 are fitted. Shield connecting portions 72a and 72b of upper shell 69, shield connecting portions 71a and 71b of middle shell 59, and second contact portion 66 of gland fitting 61 function as second contacts to be connected to gland of antenna module board 8 via mating contacts 38b to 38d.
Upper shell 69, middle shell 59, and under shell 70 connect to each other, as described above. When receptacle connector 12 and plug connector 55 are fitted, under shell 70 is electrically connected to shell 34 of receptacle connector 12. Accordingly, external shields 36a and 36b of coaxial cables 6a and 6b are connected to the gland of antenna module board 8 via gland fitting 61, upper shell 69, middle shell 59, under shell 70, and shell 34 of receptacle connector 12.
Gland fitting 61 includes first shielding plate 71 and a first shielding plate (not shown). First shielding plate 71 and the first shielding plate (not shown) each have a surface along a plane parallel to the Y-Z plane. First shielding plate 71 shields at least part (part or the whole) between first contact 60a and third contact 62a. first shielding plate (not shown) shields at least part (part or the whole) between first contact 60b and third contact 62e. First shielding plate 71 and the first shielding plate (not shown) are indirectly connected to the gland of antenna module board 8 via gland fitting 61, upper shell 69, middle shell 59, under shell 70, and shell 34 of receptacle connector 12.
Gland fitting 61 includes second shielding plate 73. Second shielding plate 73 has a surface along a plane parallel to the Y-Z plane and is disposed on the +X direction side of first contacts 60a and 60b. In other words, second shielding plate 73 shields at least part (part or the whole) of first contacts 60a and 60b on the outside (+X direction) of first contacts 60a and 60b and third contacts 62a to 62e. Second shielding plate 73 is indirectly connected to the gland of antenna module board 8 via gland fitting 61, upper shell 69, middle shell 59, under shell 70, and shell 34 of receptacle connector 12.
Gland fitting 61 includes third shielding plates 74a, 74b, and 75 and a third shielding plate (not shown). Third shielding plate 74a has a surface along a plane parallel to the Z-X plane and is disposed on the −Y direction side of first contact 60a. In other words, third shielding plate 74a shields at least part (part or the whole) of first contact 60a on one side (−Y direction side) on which first contacts 60a and 60b and third contacts 62a to 62e are disposed.
Third shielding plate 74b has a surface along a plane parallel to the Z-X plane and is disposed on the +Y direction side of first contact 60b. In other words, third shielding plate 74b shields at least part (part or the whole) of first contact 60b on one side (+Y direction side) on which first contacts 60a and 60b and third contacts 62a to 62e are disposed.
Third shielding plate 75 is disposed on the +Y direction side of first contact 60a. In other words, third shielding plate 75 shields at least part (part or the whole) of first contact 60a on one side (+Y direction) on which first contacts 60a and 60b and third contacts 62a to 62e are disposed. The third shielding plate (not shown) is disposed on the −Y direction side of first contact 60b. In other words, the third shielding plate (not shown) shields at least part (part or the whole) of first contact 60b on one side (−Y direction side) on which first contacts 60a and 60b and third contacts 62a to 62e are disposed. Third shielding plates 74a, 74b, and 75 and the third shielding plate (not shown) are indirectly connected to the gland of antenna module board 8 via gland fitting 61, upper shell 69, middle shell 59, under shell 70, and shell 34 of receptacle connector 12. Second contact portion 66 serving as the second contact functions also as a third shielding plate.
First contact 60a is enclosed in all directions by first shielding plate 71, second shielding plate 73, third shielding plate 74a, third shielding plate 75, and second contact portion 66, which are indirectly connected to the gland of antenna module board 8. This configuration allows for appropriately transmitting high-speed signals, with the impedance of first contact 60a and the impedance of coaxial cable 6a matched. Likewise, second contact 60b is enclosed in all directions by first shielding plate 71, second shielding plate 73, third shielding plate 74a, third shielding plate 75, and second contact portion 66, which are indirectly connected to the gland of antenna module board 8. This configuration allows for appropriately transmitting high-speed signals, with the impedance of first contact 60b and the impedance of coaxial cable 6b matched.
First shielding plate 71, second shielding plate 73, third shielding plate 74a, third shielding plate 75 may directly connect to external shields 36a and 36b or alternatively, first shielding plate 71, second shielding plate 73, third shielding plate 74a, third shielding plate 75 may be directly connected to the gland of antenna module board 8.
As shown in
Third contacts 62a to 62e are conductors, such as metal, which are built in housing 64. Third contacts 62a to 62e has, at one end, electrical-wire connecting portions 63a to 63e which electrically connect to electrical wires 14a to 14e, respectively. Third contacts 62a to 62e have, at the other end, third contact portions (not shown) to be electrically connected to mating contacts (third connection terminals) 30a to 30e of receptacle contact 12.
The direction in which coaxial cables 6a and 6b and electrical wires 14a to 14e are inserted in plug connector 55 is the −X direction, which is a direction perpendicular to the fitting direction (Z direction) in which plug connector 55 and receptacle connector 12 are fitted or a direction along the perpendicular direction. Electrical wires 14a to 14e are inserted closer to the fitting side on which plug connector 55 is fitted to receptacle connector 12 than coaxial cables 6a and 6b, in other words, adjacent to antenna module board 8 (−Z direction side).
Although the above embodiments have been described using an example including two coaxial cables, one or three or more coaxial cables may be included. Likewise, although the above embodiments have been described using an example including five electrical wires, four or less or six or more electrical wires may be included. Although the above embodiments have been described using an example including coaxial cables and electrical wires, only one of them may be included.
Although the above embodiments have been described using an example in which a second contact (gland contact) is disposed between first contacts (signal contacts), the order of arrangement of the first contacts and the second contact is not limited. For example, two first contacts and three second contacts may be arranged so that the first contacts are disposed between the second contacts.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2019-143542 | Aug 2019 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2020/029449 | 7/31/2020 | WO |
