WO2020080019A1 - Relais électromagnétique - Google Patents

Relais électromagnétique Download PDF

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Publication number
WO2020080019A1
WO2020080019A1 PCT/JP2019/036492 JP2019036492W WO2020080019A1 WO 2020080019 A1 WO2020080019 A1 WO 2020080019A1 JP 2019036492 W JP2019036492 W JP 2019036492W WO 2020080019 A1 WO2020080019 A1 WO 2020080019A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
housing
yoke
exposed
electromagnetic relay
Prior art date
Application number
PCT/JP2019/036492
Other languages
English (en)
Japanese (ja)
Inventor
航平 大塚
亮太 箕輪
岩坂　博之
靖雄 林田
真吾 森
直樹 川口
Original Assignee
オムロン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by オムロン株式会社 filed Critical オムロン株式会社
Publication of WO2020080019A1 publication Critical patent/WO2020080019A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/12—Ventilating; Cooling; Heating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
    • H01H50/38—Part of main magnetic circuit shaped to suppress arcing between the contacts of the relay

Definitions

  • the present invention relates to an electromagnetic relay.
  • the electromagnetic relay includes a housing, a contact device, and an electromagnetic drive device that drives the contact device.
  • the contact device and the electromagnetic drive device are arranged inside the housing (see Patent Document 1).
  • the contact device and the electromagnetic drive device generate heat when voltage is applied to the electromagnetic drive device, that is, when electricity is applied.
  • the contact device and the electromagnetic drive device generate heat, the current-carrying capacity decreases, so it is necessary to efficiently release the heat of the contact device and the electromagnetic drive device.
  • An object of the present invention is to provide an electromagnetic relay capable of efficiently dissipating heat generated by a contact device or an electromagnetic relay when energized.
  • An electromagnetic relay includes a housing, a contact device, a magnet, a first yoke, and an electromagnetic drive device.
  • the housing includes a housing.
  • the contact device is arranged in the housing.
  • the magnet is arranged around the housing and generates a magnetic field inside the housing.
  • the first yoke is connected to the magnet and is arranged around the housing portion.
  • the electromagnetic drive device includes a second yoke, is disposed adjacent to the housing portion in the housing, and drives the contact device. At least one of the magnet, the first yoke, and the second yoke includes an exposed portion exposed from the housing.
  • At least one of the magnet, the first yoke, and the second yoke includes an exposed portion that is exposed from the housing, so that the heat generated by the contact device or the electromagnetic drive device is efficiently released from the exposed portion to the outside of the housing. be able to. Further, for example, it becomes possible to bring a cooling member such as a cooling pipe into contact with the exposed portion from the outside of the housing. In this case, the heat generated by the contact device or the electromagnetic drive device can be more efficiently released to the outside of the housing. You can
  • a contact case for partitioning the accommodating portion is further provided, and the first yoke includes an exposed portion and is supported by the contact case.
  • the first accommodating portion and the exposed portion can be formed with a simple structure.
  • the exposed portion includes a protruding portion protruding toward the outside of the housing.
  • the heat generated by the contact device or the electromagnetic relay can be more efficiently released to the outside of the housing.
  • the housing includes a mounting portion that is mounted in contact with another member, and the exposed portion is exposed from the mounting portion.
  • the exposed portion is exposed from the mounting portion, it is possible to efficiently dissipate heat generated by the contact device or the electromagnetic relay to another member such as a mounting plate to which the electromagnetic relay is mounted.
  • an electromagnetic relay capable of efficiently dissipating heat generated by a contact device or an electromagnetic relay when energized.
  • FIG. 1 is a cross-sectional view of the electromagnetic relay 100.
  • the electromagnetic relay 100 includes a housing 2, a contact device 3, a pair of magnets 4, a first yoke 5, a drive shaft 6, and an electromagnetic drive device 7.
  • the direction in which the axis Ax of the drive shaft 6 extends is referred to as the “axial direction”.
  • the upper side in FIG. 1 will be described as “upper”, the lower side as “lower”, the left side as “left”, and the right side as “right” in order to facilitate understanding of the description.
  • the lower side in FIG. 1 is the contact direction Z1.
  • the upper side in FIG. 1 is the opening direction Z2. Details of the contact direction Z1 and the opening direction Z2 will be described later.
  • the housing 2 includes a case 2a and a cover 2b.
  • the case 2a has a substantially rectangular box shape and is open at the top.
  • the case 2a includes an opening 2c having a side surface partially opened to the side (see FIG. 3). Details of the opening 2c will be described later.
  • the cover 2b covers the upper part of the case 2a.
  • the case 2a and the cover 2b are made of an insulating material.
  • a contact device 3, a drive shaft 6, and an electromagnetic drive device 7 are housed inside the housing 2.
  • the housing 2 includes a housing portion 2d in which the contact device 3 is arranged.
  • the housing portion 2d is partitioned by the contact case 11 arranged in the housing 2.
  • the upper part of the contact case 11 is covered with a contact cover 12.
  • the contact case 11 and the contact cover 12 are made of an insulating material.
  • FIG. 2 is a plan view of the contact case 11.
  • the contact case 11 includes a bottom portion 11a, a cylindrical portion 11b, a wall portion 11c, a yoke support portion 11d, a first contact support portion 11e, and a second contact support portion 11f. ,including.
  • the bottom part 11a is formed in a rectangular and plate shape.
  • the bottom portion 11a has a longitudinal direction that corresponds to the left-right direction in FIG.
  • the cylindrical portion 11b extends in a tubular shape in the axial direction.
  • the cylindrical portion 11b projects downward from the center of the bottom portion 11a, and projects upward from the center of the bottom portion 11a.
  • the cylindrical portion 11b is It includes a through hole 18 that axially penetrates the bottom portion 11a.
  • the through hole 18 penetrates the center of the bottom portion 11a in the axial direction.
  • the drive shaft 6 penetrates the through hole 18 in the axial direction.
  • the wall 11c extends upward from the bottom 11a in a plate shape.
  • the wall portion 11c has a substantially rectangular shape in plan view, and the housing portion 2d is partitioned by the wall portion 11c and the bottom portion 11a.
  • the yoke support portion 11d is arranged at a position adjacent to the wall portion 11c. Specifically, the yoke support portion 11d is arranged above the first contact point support portion 11e and the second contact point support portion 11f and outside the wall portion 11c.
  • the first contact point support portion 11e is arranged on the left side of the center of the bottom portion 11a in the longitudinal direction.
  • the first contact point support portion 11e is formed to project upward from the bottom portion 11a in a rectangular shape. Since the second contact point support portion 11f has a bilaterally symmetrical shape with the first contact point support portion 11e, the description thereof will be omitted.
  • the contact cover 12 covers the upper part of the contact case 11.
  • the contact cover 12 includes an arc extending wall 12a extending toward the bottom 11a.
  • the arc extension wall 12a is formed of, for example, a resin or a ceramic material such as aluminum oxide.
  • the contact device 3 includes a first fixed terminal 14, a second fixed terminal 15, a movable contact piece 16, and a contact piece holding portion 17.
  • the first fixed terminal 14, the second fixed terminal 15, and the movable contact piece 16 are formed of a material having conductivity.
  • the first fixed terminal 14 is formed by bending a plate-shaped member.
  • the first fixed terminal 14 is supported by the first contact support portion 11e of the contact case 11 inside the housing 2.
  • the first fixed terminal 14 includes a first fixed contact 14a and a first external connection portion 14b.
  • the 1st fixed contact 14a is arrange
  • the first external connection portion 14b projects in the left-right direction from the case 2a.
  • the second fixed terminal 15 is supported in the housing 2 by the second contact support portion 11f of the contact case 11.
  • the second fixed terminal 15 includes a second fixed contact 15a and a second external connection portion 15b. Since the second fixed terminal 15 has a bilaterally symmetrical shape with the first fixed terminal 14, the description thereof will be omitted.
  • the movable contact piece 16 includes a first movable contact 16a and a second movable contact 16b.
  • the 1st movable contact 16a is arrange
  • the 2nd movable contact 16b is arranged facing the 2nd fixed contact 15a, and can contact the 2nd fixed contact 15a.
  • the movable contact piece 16 is movable in a contact direction Z1 that contacts the first fixed contact 14a and the second fixed contact 15a and a separation direction Z2 that separates from the first fixed contact 14a and the second fixed contact 15a.
  • the contact direction Z1 is an example of the first direction
  • the opening direction Z2 is an example of the second direction.
  • the contact direction Z1 is the direction in which the first movable contact 16a and the second movable contact 16b contact the first fixed contact 14a and the second fixed contact 15a (downward in FIG. 1).
  • the separation direction Z2 is a direction (the upper side in FIG. 1) in which the first movable contact 16a and the second movable contact 16b are separated from the first fixed contact 14a and the second fixed contact 15a.
  • the contact direction Z1 and the opening direction Z2 coincide with the axial direction.
  • the contact piece holder 17 holds the movable contact piece 16 via the drive shaft 6, as shown in FIG.
  • the contact piece holder 17 connects the movable contact piece 16 and the drive shaft 6.
  • the contact piece holder 17 includes a holder 24 and a contact spring 25.
  • the movable contact piece 16 is sandwiched by the upper portion of the holder 24 and the collar portion 6 a of the drive shaft 6 in the axial direction.
  • the contact spring 25 is arranged between the bottom of the holder 24 and the collar 6a of the drive shaft 6, and biases the drive shaft 6 and the movable contact piece 16 toward the opening direction Z2.
  • FIG. 3 is a plan view when the cover 2b and the contact cover 12 are removed from the electromagnetic relay 100.
  • the pair of magnets 4 are arranged around the housing portion 2d.
  • the pair of magnets 4 are arranged around the wall portion 11c of the contact case 11 at positions facing each other in the left-right direction.
  • the pair of magnets 4 are arranged in a recess 11g formed in the wall 11c so as to be recessed in a direction toward the cylindrical portion 11b.
  • the recess 11g is formed at a position adjacent to the yoke support 11d, as shown in FIG.
  • the pair of magnets 4 are permanent magnets and generate a magnetic field inside the housing portion 2d.
  • the pair of magnets 4 are provided for extending an arc generated when the first movable contact 16a and the second movable contact 16b are separated from the first fixed contact 14a and the second fixed contact 15a in a predetermined direction. .
  • the first yoke 5 is a magnetic body, and as shown in FIGS. 1 and 3, is connected to the pair of magnets 4 and arranged around the housing portion 2d. In the present embodiment, the first yoke 5 is arranged around the wall portion 11c of the contact case 11.
  • FIG. 4 is a perspective view of the first yoke 5.
  • the first yoke 5 has a substantially U shape in a plan view and is formed by bending a plate-shaped member.
  • the first yoke 5 includes a base portion 5a, a pair of side portions 5b, and a foot portion 5c.
  • the base 5a extends in the left-right direction.
  • the pair of side portions 5b are arranged so as to face each other at both ends of the base portion 5a.
  • the pair of side portions 5b overlaps with the yoke support portion 11d of the contact case 11 in the axial direction, and the inner surface thereof is in contact with the pair of magnets 4.
  • the foot portion 5c is formed to extend in the contact direction Z1 at both ends of the pair of side portions 5b.
  • the foot portion 5c is in contact with and supported by the bottom portion 11a of the contact case 11 and the yoke support portion 11d outside the wall portion 11c of the contact case 11.
  • the first yoke 5 includes an exposed portion 8 that is at least partially exposed from the housing 2.
  • the exposed portion 8 in the present embodiment is constituted by the outer surface 5d of the base portion 5a of the first yoke 5. That is, the base portion 5 a of the first yoke 5 is configured such that the outer surface 5 d is exposed to the outside of the housing 2.
  • the exposed portion 8 is exposed from the opening 2c of the case 2a, as shown in FIG.
  • the opening 2c is formed by cutting out a side surface of the case 2a facing the outer surface 5d of the base 5a of the first yoke 5 into a substantially rectangular shape.
  • the drive shaft 6 extends along the contact direction Z1 and the separation direction Z2.
  • the drive shaft 6 is connected to the movable contact piece 16 via a contact piece holding portion 17.
  • the drive shaft 6 is movable in the contact direction Z1 and the opening direction Z2 together with the movable contact piece 16.
  • the electromagnetic drive device 7 drives the contact device 3. Specifically, the electromagnetic drive device 7 moves the movable contact piece 16 together with the drive shaft 6 in the contact direction Z1 and the opening direction Z2 by an electromagnetic force.
  • the electromagnetic drive device 7 is arranged in the housing 2 in a space different from that of the housing portion 2d. In the present embodiment, the electromagnetic drive device 7 is arranged below the contact case 11.
  • the electromagnetic drive device 7 includes a coil 32, a spool 33, a movable iron core 34, a fixed iron core 35, a biasing member 36, and a second yoke 37.
  • the coil 32 is attached to the outer circumference of the spool 33.
  • the spool 33 includes a housing portion 33a.
  • the accommodation portion 33 a is provided on the inner peripheral portion of the spool 33.
  • the accommodation portion 33a has a cylindrical shape and extends along the axial direction.
  • the housing portion 33a overlaps the through hole 18 of the cylindrical portion 11b of the contact case 11 in the axial direction.
  • a part of the drive shaft 6 is arranged in the housing portion 33a.
  • the movable iron core 34 is arranged inside the housing portion 33a.
  • the movable core 34 has a cylindrical shape, and the drive shaft 6 penetrates the center thereof in the axial direction, and is connected to the drive shaft 6 so as to be integrally movable.
  • the movable iron core 34 is movable in the axial direction together with the drive shaft 6.
  • the movable iron core 34 is guided to move in the axial direction by the annular iron core 38 arranged in the housing portion 33a.
  • the fixed iron core 35 is arranged in the accommodation portion 33a so as to face the movable iron core 34 on the contact direction Z1 side of the movable iron core 34.
  • the fixed iron core 35 is fixed to the second yoke 37.
  • the biasing member 36 is, for example, a coil spring, and is arranged between the movable iron core 34 and the fixed iron core 35.
  • the biasing member 36 biases the movable iron core 34 in the opening direction Z2. Therefore, the biasing member 36 is arranged between the movable iron core 34 and the fixed iron core 35 in a compressed state.
  • the second yoke 37 is a magnetic body and is arranged inside the housing 2 around the spool 33.
  • the second yoke 37 includes a yoke 37a and a yoke 37b.
  • the yoke 37 a has a plate shape and is arranged between the bottom portion 11 a of the contact case 11 and the spool 33.
  • the yoke 37a is fixed to the bottom portion 11a of the contact case 11 by a plurality of screw members (not shown).
  • the yoke 37a overlaps the lower part of the cylindrical portion 11b in the left-right direction.
  • the yoke 37a is connected to the annular iron core 38.
  • the yoke 37b has a substantially U shape, and the bottom portion is arranged below the spool 33 and is connected to the fixed iron core 35. The upper ends of both sides of the yoke 37b are connected to the yoke 37a.
  • FIG. 1 shows a state in which no voltage is applied to the coil 32.
  • the biasing member 36 stops the movement of the movable core 34 in the contact direction Z1. Therefore, the first movable contact 16a and the second movable contact 16b are in a state of being separated from the first fixed contact 14a and the second fixed contact 15a.
  • FIG. 5 shows a state in which a voltage is applied to the coil 32.
  • a voltage is applied to the coil 32 to excite it
  • the electromagnetic force of the coil 32 causes the movable iron core 34 to move in the contact direction Z1 against the elastic force of the urging member 36.
  • the drive shaft 6 and the movable contact piece 16 move in the contact direction Z1, and the first movable contact 16a and the second movable contact 16b become the first fixed contact 14a and the second fixed contact 15a.
  • the movable iron core 34 moves in the opening direction Z2 due to the elastic force of the biasing member 36, and the first movable contact 16a and the second movable contact 16b move to the first fixed contact 14a. And, it is in a state of being separated from the second fixed contact 15a.
  • the first movable contact 16a and the second movable contact 16b are in contact with the first fixed contact 14a and the second fixed contact 15a, that is, the contact device 3 when energized. It is possible to efficiently dissipate the heat generated by the outside of the housing 2 by the exposed portion 8. Specifically, the heat generated by the contact device 3 during energization is transmitted from the contact case 11 or the pair of magnets 4 to the first yoke 5. Then, the heat generated by the contact device 3 transmitted to the first yoke 5 can be released from the exposed portion 8 to the outside of the housing 2. Here, since the exposed portion 8 is exposed from the housing 2, the heat generated by the contact device 3 can be efficiently released. As a result, it is possible to suppress a decrease in current carrying capacity due to heat generation of the contact device 3.
  • a cooling member such as a cooling pipe can be arranged so as to contact the exposed portion 8 from the outside of the housing 2. In this case, the heat generated by the contact device 3 can be more efficiently released to the outside of the housing 2.
  • the configuration of the electromagnetic drive device 7 may be changed.
  • the shape or the arrangement of the housing 2, the contact case 11, the contact cover 12, the pair of magnets 4, the first yoke 5, and the second yoke 37 may be changed.
  • At least one of the first yoke 5 and the second yoke 37 preferably includes the exposed portion 8.
  • the shape of the opening 2c of the housing 2 may be changed according to the position and shape of the exposed portion 8.
  • the exposed portion 8 may be configured by appropriately combining the above-described embodiment and the modified examples described below.
  • FIG. 6 is a plan view of the electromagnetic relay 100 when the cover 2b and the contact cover 12 according to the first modification are removed.
  • the exposed portion 8 according to the first modified example includes a protruding portion 8 a protruding toward the outside of the housing 2.
  • Other configurations are the same as those in the above embodiment.
  • the protruding portion 8a is formed by bending a part of the first yoke 5, for example. In this case, since the surface area of the exposed portion 8 is large, the heat generated by the contact device 3 can be more efficiently released to the outside of the housing 2.
  • the shape of the protruding portion 8a may be any shape that increases the surface area of the exposed portion 8.
  • the protruding portion 8a may be formed by protruding a part of the yoke 37a of the second yoke 37 toward the outside of the housing 2. In this case, the heat generated by the electromagnetic drive device 7 can be efficiently released to the outside of the housing 2.
  • FIG. 8 is a plan view of the electromagnetic relay 100 according to the second modification as seen from the contact direction Z1.
  • FIG. 9 is a side view when the electromagnetic relay 100 according to the second modification is attached to another member 40.
  • the other member 40 is, for example, a mounting plate of an electric machine using the electromagnetic relay 100.
  • the housing 2 includes a fixed portion 2e and a mounting portion 2f.
  • the fixing portion 2e is fixed to the other member 40 by a screw member (not shown).
  • the mounting portion 2f is mounted in contact with another member 40.
  • the mounting portion 2f here is the surface of the cover 2b of the housing 2 on the side in the opening direction Z2.
  • the exposed portion 8 is exposed from the mounting portion 2f.
  • the opening 2c having a shape corresponding to the shape of the first yoke 5 is formed in the cover 2b, and the surface of the first yoke 5 on the opening direction Z2 side is exposed from the mounting portion 2f. is doing.
  • the heat generation of the contact device 3 can be efficiently released to the other member 40 via the first yoke 5. Further, by configuring the exposed portion 8 to be in contact with the other member 40, the design of the cooling pipe when the exposed portion 8 is cooled by providing a cooling pipe, for example, becomes easy. Further, compared to the case where the exposed portion 8 is provided with the protruding portion 8a, there is less possibility of interfering with other members.
  • the other member 40 is preferably formed of a material having an insulating property. Further, depending on the current carrying capacity, it is necessary to appropriately adjust the material, size, etc. of the other member 40. Further, as shown in FIG. 7, the pair of magnets 4 may be exposed from the mounting portion 2f to form the exposed portion 8. Further, as shown in FIGS. 10 and 11, the shape of the first yoke 5 can be appropriately changed according to the configuration of the contact device 3. That is, the shape of the exposed portion 8 can be appropriately changed according to the configuration of the contact device 3.
  • the second yoke 37 is exposed from the mounting portion 2f and the second yoke 37 is brought into contact with another member 40. You may arrange it.
  • an electromagnetic relay capable of efficiently dissipating heat generated by a contact device or an electromagnetic relay when energized.
  • Electromagnetic drive device 8 Exposed part 8a Projection part 11 Contact case 37 2nd yoke 100 Electromagnetic relay

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Electromagnets (AREA)

Abstract

L'invention concerne un relais électromagnétique comprenant un boîtier, un dispositif de contact, un aimant, une première culasse et un dispositif d'entraînement électromagnétique. Le boîtier comprend une partie de logement. Le dispositif de contact est disposé dans la partie de logement. L'aimant est disposé autour de la partie de logement, et provoque la génération d'un champ magnétique à l'intérieur de la partie de logement. La première culasse est reliée à l'aimant, et disposée autour de la partie de logement. Le dispositif d'entraînement électromagnétique comprend une seconde culasse, est disposé adjacent à la partie de logement dans le boîtier, et entraîne le dispositif de contact. Au moins l'un de l'aimant, de la première culasse et de la seconde culasse comprend une partie exposée qui est exposée à partir du boîtier.
PCT/JP2019/036492 2018-10-16 2019-09-18 Relais électromagnétique WO2020080019A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018195234A JP7417351B2 (ja) 2018-10-16 2018-10-16 電磁継電器
JP2018-195234 2018-10-16

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WO2020080019A1 true WO2020080019A1 (fr) 2020-04-23

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20240141574A (ko) * 2023-03-20 2024-09-27 엘에스이모빌리티솔루션 주식회사 아크 경로 형성부 및 이를 포함하는 직류 릴레이

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5938745B2 (ja) * 1977-06-20 1984-09-19 株式会社日立製作所 半導体機械電気変換器
JPH07282705A (ja) * 1994-02-17 1995-10-27 Toshiba Corp 電磁接触器
JP2012199123A (ja) * 2011-03-22 2012-10-18 Panasonic Corp リレー装置
JP2012199120A (ja) * 2011-03-22 2012-10-18 Panasonic Corp 接点装置
JP2012248509A (ja) * 2011-05-31 2012-12-13 Toyota Motor Corp リレーの放熱構造
JP2015072925A (ja) * 2014-12-09 2015-04-16 パナソニックＩｐマネジメント株式会社 接点装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009140679A (ja) 2007-12-05 2009-06-25 Yazaki Corp 電磁リレーの放熱構造

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5938745B2 (ja) * 1977-06-20 1984-09-19 株式会社日立製作所 半導体機械電気変換器
JPH07282705A (ja) * 1994-02-17 1995-10-27 Toshiba Corp 電磁接触器
JP2012199123A (ja) * 2011-03-22 2012-10-18 Panasonic Corp リレー装置
JP2012199120A (ja) * 2011-03-22 2012-10-18 Panasonic Corp 接点装置
JP2012248509A (ja) * 2011-05-31 2012-12-13 Toyota Motor Corp リレーの放熱構造
JP2015072925A (ja) * 2014-12-09 2015-04-16 パナソニックＩｐマネジメント株式会社 接点装置

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JP2020064745A (ja) 2020-04-23

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