EP3705949A1 - Mecanisme limiteur de couple d'horlogerie - Google Patents

Mecanisme limiteur de couple d'horlogerie Download PDF

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Publication number
EP3705949A1
EP3705949A1 EP19160841.3A EP19160841A EP3705949A1 EP 3705949 A1 EP3705949 A1 EP 3705949A1 EP 19160841 A EP19160841 A EP 19160841A EP 3705949 A1 EP3705949 A1 EP 3705949A1
Authority
EP
European Patent Office
Prior art keywords
mobile
rotation
arm
relative
axis
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP19160841.3A
Other languages
German (de)
English (en)
French (fr)
Inventor
Julien Christan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
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 ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP19160841.3A priority Critical patent/EP3705949A1/fr
Priority to JP2020034659A priority patent/JP6944558B2/ja
Priority to US16/805,904 priority patent/US11768464B2/en
Priority to CN202010142462.2A priority patent/CN111665704B/zh
Publication of EP3705949A1 publication Critical patent/EP3705949A1/fr
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B11/00—Click devices; Stop clicks; Clutches
    • G04B11/001—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power
    • G04B11/003—Clutch mechanism between two rotating members with transfer of movement in both directions, possibly with limitation on the transfer of power with friction member, e.g. with spring action
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/08—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously by parts of the cases
    • G04B3/10—Protecting means preventing overwinding
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/005—Gearwork where a revolution in both directions is changed into a revolution in one direction
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/021—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft
    • G04B13/023—Wheels; Pinions; Spindles; Pivots elastic fitting with a spindle, axis or shaft allowing rotational slipping when a threshold torque is exceeded
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B3/00—Normal winding of clockworks by hand or mechanically; Winding up several mainsprings or driving weights simultaneously
    • G04B3/06—Keys or the like with means preventing overwinding

Definitions

  • the invention relates to an internal torque limiter mechanism for a timepiece movement, said torque limiter mechanism comprising a first mobile comprising a first rim and arranged to pivot about a first axis of rotation relative to a structure or a plate or a bridge, said first mobile comprising at least one first elastic arm which, in the free state of said first mobile, protrudes in the direction of said first axis of rotation relative to said first rim, and at least one second mobile comprising a second serge and arranged to pivot relative to said structure about a second axis of rotation parallel to or coincident with said first axis of rotation in at least partial overlap with said first mobile.
  • the invention also relates to a barrel winding device comprising a control member arranged to be operated by a user and to drive an input pinion meshing with said first mobile or said second mobile of such a torque limiting mechanism, which comprises said device.
  • the invention also relates to a timepiece movement comprising, between an input mechanism and an output mechanism, such a torque limiting mechanism.
  • the invention also relates to a timepiece, in particular a watch, comprising at least one such torque limiting mechanism, and / or at least one such movement.
  • the invention relates to the field of clockwork mechanisms, and more particularly the protection of certain mechanisms against an excessive input of torque, in particular mechanisms for recharging energy such as winding mechanisms, or else correction mechanisms and / or display, in particular calendar mechanisms or the like.
  • Some watch mechanisms are designed to store and release large amounts of energy, however their sizing is limited by that of the case of the timepiece concerned, and it is not possible to apply high safety coefficients to them for protect them against excessive torque applied to them.
  • the large size of the mechanisms Known torque limiters restrict the integration of complications into the timepiece.
  • the user does not have the possibility of knowing whether he has correctly and safely carried out a complete manipulation, in particular for winding a mechanism.
  • the invention proposes to provide a torque limiting device, very compact, economical, and the use of which allows the user to easily determine the correct accomplishment of a maneuver on his part.
  • the invention relates to an internal torque limiter mechanism for a timepiece movement, according to claim 1.
  • the invention also relates to a barrel winding device comprising such a torque limiting mechanism.
  • the invention also relates to a timepiece movement comprising, between an input mechanism and an output mechanism, such a torque limiting mechanism.
  • the invention also relates to a timepiece, in particular a watch, comprising at least one such torque limiting mechanism, and / or at least one such movement.
  • the invention relates to a torque limiting mechanism 100 for clockwork.
  • This mechanism 100 comprises a first mobile 1, which comprises a first rim 10 and is arranged to pivot about a first axis of rotation D1 relative to a structure 4 or a plate or a bridge.
  • This first mobile 1 comprises at least a first elastic arm 31, which, in the free state of the first mobile 1, protrudes in the direction of the first axis of rotation D1 with respect to the first rim 10. More particularly and without limitation, this first elastic arm 31 is movable in a first cutout 41 of the first mobile 1.
  • the mechanism 100 comprises at least one second mobile 2, which comprises a second rim 20 and arranged to pivot relative to the structure 4 about a second axis of rotation D2, parallel or coincident with the first axis of rotation D1, overlapping at least partial with the first.
  • the mechanism 100 comprises a stroke limiter 5, which is fixed to the structure 4, and which is arranged to hold the second mobile 2 on the first mobile 1 for their cooperation in friction bearing in certain relative angular positions.
  • the invention is more particularly described here in the simplified case where the mechanism 100 comprises only the first mobile 1 and the second mobile 2, the person skilled in the art will know how to extrapolate it to a greater number of mobile devices, for a mechanism comprising more only one entrance and one exit.
  • the invention proposes to vary the frictional force between the first mobile 1 and the second mobile 2.
  • the second mobile 2 and / or the stroke limiter 5 and / or the structure 4 comprises at least one relief forming a ramp, and which protrudes in a direction parallel or coincident with that of the first axis of rotation D1.
  • This relief is arranged for, in certain relative angular positions of the component bearer of this relief with respect to the first mobile 1, cooperate in friction bearing with at least a first elastic arm 31 of said first mobile 1, and, in other relative angular positions, allow a relative travel without friction between the first mobile 1 and the component carrying this relief.
  • the mechanism constitutes a simple pawl, arranged to vary the axial position of the first elastic arm of the first mobile 1, or to vary the axial position of the first mobile 1 while whole and thus vary the friction force applied to the second mobile 2.
  • the invention relates more particularly to the case where the second mobile 2 comprises at least one second arm 32 forming a ramp and which, in the free state of the second mobile 2, protrudes in the direction of the second axis of rotation D2 with respect to the second serge 20.
  • this second arm 32 is a second elastic arm 32. More particularly still, this second arm 32 is a second elastic arm 32 movable in a second cutout 42.
  • first mobile 1 and the second mobile 2 When only the first mobile 1 and the second mobile 2 have protruding reliefs relative to their respective rim, they are mounted head-to-tail, with each first elastic arm 31 projecting towards the second mobile 2, and with each second arm 32 projecting towards the first mobile 1.
  • the second axis of rotation D2 is distant from the first axis of rotation D1.
  • the second axis of rotation D2 coincides with the first axis of rotation D1.
  • each second arm 32 is arranged to cooperate successively, during a relative rotation of the second mobile 2 relative to the first mobile 1, cyclically with the first rim 10, a first elastic arm 31, and a first cutout 41 before returning in cooperation with the first serge 10.
  • first mobile 1 and the second mobile 2 are arranged, if they are coaxial, to rotate in the same direction: either they both rotate in the same direction, or one rotates and the other is blocked. .
  • These mobiles can, in other applications where they are not coaxial, turn in the opposite direction to each other.
  • Each first elastic arm 31 of the first mobile defines a first ramp, which begins at the level of an articulation 310 with the first rim 10, and rises to the level of a first vertex. More particularly and as visible in the figures, this first elastic arm 31 is a cantilever arm, and the top coincides with the distal end of this first arm 31, the edge of which defines a first front surface 311.
  • any relief of an opposing mobile, in particular the second mobile 2 during a rotation always in the same direction of each mobile, climbs this first ramp, then falls after passing the top; depending on the configuration, this relief falls on the first rim 10, or in the first cutout 41. This jump corresponds to the disengagement of the mechanism.
  • the first elastic arm 31 comprises an ascending ramp from the first rim 10 to the first vertex, then a descending ramp from the first vertex to the first rim 10.
  • the relief of the second mobile 2 can be formed in different ways, the figures represent this relief in the form of a second elastic arm 32 similar to the first elastic arm 31 of the first mobile 1, this configuration is advantageous because it allows to use, for the first mobile 1 and second mobile 2, identical components, at least at the level of these reliefs cooperating with one another; of course, depending on the application, the first mobile 1 and the second mobile 2 may have different teeth, depending on the components of the movement with which they cooperate.
  • each first elastic arm 31 is arranged to cooperate successively, during a relative rotation of the second mobile 2 relative to the first mobile 1, with the second rim 20, a second arm 32, and a second cutout 42 which the second mobile 2, before returning in cooperation with the second serge 20.
  • the arrangement with a first front surface 311, and a second similar front surface 312 for the second elastic arm allows, in a particular direction of rotation, the cooperation in abutment with each other, and the rotation drive by support simple, without friction, from one mobile to the other, while, in the opposite direction of rotation, the elastic arms gradually cooperate up to a detent position where one of the mobile is no longer driven by the other.
  • each first elastic arm 31 is a substantially annular sector which extends substantially concentrically with respect to the first axis of rotation D1. Its radial section can be constant, or else progressive or degressive, so as to obtain a variable friction according to the relative angle between the opposing mobiles.
  • the upper surface of the first elastic arm 31 extends, radially with respect to the first axis of rotation D1, perpendicularly thereto. In a variant that is not shown, this first elastic arm 31 can, again, be warped and tilted.
  • Each second resilient arm 32 can be made in a similar fashion. And in particular, more particularly, each second elastic arm 32 extends substantially concentrically with respect to the second axis of rotation D2.
  • At least a first elastic arm 31 or / and at least a second arm 32 extends substantially radially with respect to the axis of rotation of the mobile which carries it.
  • the mechanism 100 comprises, in at least partial superposition in a direction parallel to the axis of rotation of each of them, more than two moving parts arranged to cooperate in pairs in friction bearing, and all mounted prisoners between the structure 4 and the stroke limiter 5, and at least one intermediate mobile between the end wheels comprises at least one elastic arm projecting on each side of its rim, in its axial direction: this is the case with the second mobile 2 of the figure 18 , which cooperates, on the upper side of the second rim 20, with the first mobile 1, and, on the lower side of the second rim 20, with the relief 39 projecting from the third rim 90 of a third mobile 9 resting on the structure 4.
  • the invention also relates to a barrel winding device 200, comprising a control member 201 which is arranged to be operated by a user, such as a control rod, a pusher, a bolt, a bezel, or the like, and to drive an input pinion 202 meshing with the first mobile 1 or the second mobile 2 of such a torque limiting mechanism 100, which this device 200 comprises.
  • the other mobile of this mechanism 100, the second mobile 2 or respectively the first mobile 1 is arranged to drive a ratchet 203 of a motor or striking barrel, the whole being assembled on the structure 4 which is, in this particular case, a barrel bridge.
  • the stroke limiter 5 is advantageously a screw fixed to this structure, which facilitates the assembly of the entire mechanism 100 and allows disassembly.
  • the usual crown wheel is split into two boards, constituting the first mobile 1 and the second mobile 2, and advantageously in a very economical embodiment, the first 31 and second 32 elastic arms are cut and folded in each one. These boards are then mounted head to tail in place of the crown wheel.
  • the first mobile 1 meshes with a winding pinion 202
  • the second mobile 2 meshes with the barrel ratchet 203.
  • the first mobile 1 and the second mobile 2 are secured by means of the elastic arms 31 and 32, which transmit a torque by friction. If the torque applied to the winding pinion 202 is too great, the elastic arms 31 and 32 become deformed and slide against each other, until the system disengages. When disengaging, the jump made by the elastic arms 31 and 32 during unclipping produces a characteristic noise which gives the user the receipt that the barrel is completely recharged.
  • each mobile 1, 2 comprises three elastic arms 31 32. After disengagement, the first mobile 1 makes a third of a turn.
  • the play between the sides of the two moving parts is between 0.06 and 0.10 mm, and the axial elastic travel of each arm is half the value of this play.
  • the invention also relates to a timepiece movement 500 comprising, between an input mechanism 300 and an output mechanism 400, such a torque limiting mechanism 100.
  • the input mechanism 300 is a calendar or date mechanism
  • the output mechanism 400 is a month, or day of the week, or date display mechanism.
  • the torque limiter 100 is designed to control, during any jump of an arm of a mobile 1 or 2 of the torque limiter 100, the advancement of one step of the display concerned.
  • the control of the correction of the display of the day of the week is a cyclical control for which the device according to the invention is well suited. In the same way, it is possible to obtain a frank adjustment of the date correction.
  • the invention is easily adaptable to any semi-instantaneous or trailing display: months, days, time zones, hours, or others.
  • the invention also makes it possible to produce a reverser for a mono- or bidirectional winding: the first mobile 1 meshes with an oscillating weight for automatic winding, and the second mobile 2 meshes with the winding gear.
  • the first mobile 1 turns clockwise, the system clicks and the second mobile 2 does not turn.
  • the first mobile 1 rotates in the counterclockwise direction, it drives the second mobile 2 through the distal ends 311, 321, of the elastic arms 31 and 32.
  • the movement 500 comprises an automatic winding oscillating weight and a gear train.
  • winding mechanism and such a torque limiter 100 comprising elastic arms 31, 32, constitutes an inverter for a mono- or bidirectional winding, the first mobile 1 meshing with the automatic winding oscillating weight, and the second mobile 2 meshing with the winding gear, so that, when the first mobile 1 rotates clockwise, or respectively counterclockwise, the system clicks and the second mobile 2 does not rotate, and when the first mobile 1 rotates counterclockwise, or respectively clockwise, it drives the second mobile 2 through distal ends 311, 321, which respectively comprise the elastic arms 31, 32.
  • the invention also makes it possible to produce a blocker, for example to prevent a barrel from discharging.
  • a blocker for example to prevent a barrel from discharging.
  • the movement 500 comprises at least one barrel and a ratchet arranged on a barrel bridge, and such a torque limiter 100 constitutes a blocker, to prevent a barrel from discharging, the ratchet constituting one of the mobiles 1, 2 , and comprising elastic arms, and the barrel bridge constituting a structure 4 and comprising notches, so that the ends of the arms fall into the notches.
  • the input mechanism 300 is a minute repeater trigger mechanism
  • the output mechanism 400 is a minute repeater mechanism.
  • the torque limiter 100 is then arranged to control, during any jump of an arm of a mobile 1 or 2 of the torque limiter 100, the tilting of an isolator, which the minute repeater mechanism includes, to prevent the control of another repeat while playing a repeat ringtone.
  • the invention also relates to a timepiece 1000 comprising at least one such torque limiting mechanism 100, and / or at least one such movement 500. More particularly, this timepiece 1000 is a watch.
  • the proposed mechanism is very simple, because it does not require any elastic return means other than those carried by the first mobile 1, and preferably the second mobile 2.
  • the coaxial arrangement of the moving parts is particularly advantageous, since the forces exerted on the moving parts are symmetrical, and the transmissible force is maximum.
  • the arrangement in the clockwork movement involves offsetting the first mobile 1 and the second 2, it is advantageous to increase the number of elastic arms in order to avoid blind spots.
  • the production of the mobiles can come, very economically, from stamping, the mobiles can be identical, and possibly differ by their teeth only.
  • the invention enables the user to ensure the correct completion of the function he performs, winding, display correction, tripping, and ensures the protection of the components of the mechanism concerned against any excessive torque. For example, the user can wind a barrel completely without fear of breaking a component.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Transmission Devices (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Braking Arrangements (AREA)
EP19160841.3A 2019-03-05 2019-03-05 Mecanisme limiteur de couple d'horlogerie Pending EP3705949A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19160841.3A EP3705949A1 (fr) 2019-03-05 2019-03-05 Mecanisme limiteur de couple d'horlogerie
JP2020034659A JP6944558B2 (ja) 2019-03-05 2020-03-02 計時器のトルク制限機構
US16/805,904 US11768464B2 (en) 2019-03-05 2020-03-02 Horological torque limiting mechanism
CN202010142462.2A CN111665704B (zh) 2019-03-05 2020-03-04 钟表扭矩限制机构

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19160841.3A EP3705949A1 (fr) 2019-03-05 2019-03-05 Mecanisme limiteur de couple d'horlogerie

Publications (1)

Publication Number Publication Date
EP3705949A1 true EP3705949A1 (fr) 2020-09-09

Family

ID=65717803

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19160841.3A Pending EP3705949A1 (fr) 2019-03-05 2019-03-05 Mecanisme limiteur de couple d'horlogerie

Country Status (4)

Country Link
US (1) US11768464B2 (zh)
EP (1) EP3705949A1 (zh)
JP (1) JP6944558B2 (zh)
CN (1) CN111665704B (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4160320A1 (fr) * 2021-10-04 2023-04-05 Patek Philippe SA Genève Mécanisme horloger

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3705949A1 (fr) * 2019-03-05 2020-09-09 ETA SA Manufacture Horlogère Suisse Mecanisme limiteur de couple d'horlogerie
CN113878527B (zh) * 2021-12-07 2022-02-25 天津海鸥表业集团有限公司 一种发条扭矩测试辅助工装

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1207713A (fr) * 1957-08-20 1960-02-18 Otero Mécanisme de remontage automatique, notamment pour montres-bracelets
EP1843225A1 (fr) * 2006-04-07 2007-10-10 ETA SA Manufacture Horlogère Suisse Mécanisme inverseur pour entraînement rotatif unidirectionnel d'un mobile
CH703483A2 (fr) * 2010-07-30 2012-01-31 Seiko Instr Inc Rouage de remontage à limitation de couple, mouvement et pièce d'horlogerie équipé d'un tel rouage.
EP2871534A1 (fr) * 2013-11-06 2015-05-13 ETA SA Manufacture Horlogère Suisse Mobile d'horlogerie à roue unidirectionnelle

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CH408785A (fr) * 1963-12-11 1966-09-30 Schild Sa A Dispositif d'armage du ressort moteur d'un mouvement d'horlogerie
CH542468A (fr) * 1969-09-15 1973-11-15 Schild Sa A Dispositif de blocage unidirectionnel d'une roue à rochet dans un mouvement de montre
ATE516523T1 (de) * 2006-04-12 2011-07-15 Montres Breguet Sa Uhr mit schlagwerk, das ein einziges federhaus umfasst
ATE437388T1 (de) * 2007-11-08 2009-08-15 Meco Sa Aufzugskrone für uhr, die einen mechanismus mit drehmomentkupplung umfasst
CN201698159U (zh) * 2010-06-07 2011-01-05 天津海鸥表业集团有限公司 手表的恒力装置
EP2482143A1 (fr) * 2011-01-26 2012-08-01 Nivarox-FAR S.A. Assemblage par blocage à cliquet
JP5844985B2 (ja) * 2011-03-08 2016-01-20 セイコーインスツル株式会社 手巻時計用戻しばね構造体、これを備えた手巻機構並びに手巻時計
JP6057659B2 (ja) * 2012-10-18 2017-01-11 セイコーインスツル株式会社 時計用の定トルク機構及び該機構を備えたムーブメント及び機械式時計
EP3002636B1 (fr) * 2014-10-02 2017-08-09 ETA SA Manufacture Horlogère Suisse Roues coaxiales débrayables d'un mouvement horloger
EP3021174A1 (en) * 2014-11-17 2016-05-18 LVMH Swiss Manufactures SA Monolithic timepiece regulator, timepiece movement and timepiece having such a timepiece regulator
EP3220206B1 (fr) * 2016-03-16 2020-09-30 Rolex Sa Dispositif horloger de transmission
EP3667431A1 (fr) * 2018-12-13 2020-06-17 Montres Breguet S.A. Mobile d'affichage d'horlogerie avec mecanisme de reglage de la friction
EP3705949A1 (fr) * 2019-03-05 2020-09-09 ETA SA Manufacture Horlogère Suisse Mecanisme limiteur de couple d'horlogerie
EP3786720B1 (fr) * 2019-08-27 2023-12-13 Rolex Sa Composant horloger destiné à recevoir un organe par chassage
EP3907564A1 (fr) * 2020-05-05 2021-11-10 ETA SA Manufacture Horlogère Suisse Élément d'indexation d'horlogerie

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1207713A (fr) * 1957-08-20 1960-02-18 Otero Mécanisme de remontage automatique, notamment pour montres-bracelets
EP1843225A1 (fr) * 2006-04-07 2007-10-10 ETA SA Manufacture Horlogère Suisse Mécanisme inverseur pour entraînement rotatif unidirectionnel d'un mobile
CH703483A2 (fr) * 2010-07-30 2012-01-31 Seiko Instr Inc Rouage de remontage à limitation de couple, mouvement et pièce d'horlogerie équipé d'un tel rouage.
EP2871534A1 (fr) * 2013-11-06 2015-05-13 ETA SA Manufacture Horlogère Suisse Mobile d'horlogerie à roue unidirectionnelle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4160320A1 (fr) * 2021-10-04 2023-04-05 Patek Philippe SA Genève Mécanisme horloger

Also Published As

Publication number Publication date
CN111665704B (zh) 2021-11-09
US11768464B2 (en) 2023-09-26
CN111665704A (zh) 2020-09-15
JP6944558B2 (ja) 2021-10-06
US20200285196A1 (en) 2020-09-10
JP2020144126A (ja) 2020-09-10

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