EP3663869A1 - Schlagwerkmechanismus einer uhr mit hängehammer - Google Patents

Schlagwerkmechanismus einer uhr mit hängehammer Download PDF

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Publication number
EP3663869A1
EP3663869A1 EP18210745.8A EP18210745A EP3663869A1 EP 3663869 A1 EP3663869 A1 EP 3663869A1 EP 18210745 A EP18210745 A EP 18210745A EP 3663869 A1 EP3663869 A1 EP 3663869A1
Authority
EP
European Patent Office
Prior art keywords
hammer
striking mechanism
activation
flexible guide
winding
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.)
Granted
Application number
EP18210745.8A
Other languages
English (en)
French (fr)
Other versions
EP3663869B1 (de
Inventor
Marc Stranczl
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.)
Montres Breguet SA
Original Assignee
Montres Breguet SA
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 Montres Breguet SA filed Critical Montres Breguet SA
Priority to EP18210745.8A priority Critical patent/EP3663869B1/de
Priority to US16/683,554 priority patent/US11754976B2/en
Priority to JP2019216208A priority patent/JP6872596B2/ja
Priority to CN201911241846.3A priority patent/CN111290230B/zh
Publication of EP3663869A1 publication Critical patent/EP3663869A1/de
Application granted granted Critical
Publication of EP3663869B1 publication Critical patent/EP3663869B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G04B21/00—Indicating the time by acoustic means
    • G04B21/02—Regular striking mechanisms giving the full hour, half hour or quarter hour
    • G04B21/06—Details of striking mechanisms, e.g. hammer, fan governor
    • 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
    • G04B5/00—Automatic winding up
    • G04B5/02—Automatic winding up by self-winding caused by the movement of the watch
    • G04B5/18—Supports, suspensions or guide arrangements, for oscillating weights
    • G04B5/188—Bearing, guide arrangements or suspension of the movement forming oscillating weight
    • 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
    • G04B15/00—Escapements
    • G04B15/10—Escapements with constant impulses for the regulating mechanism
    • 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
    • G04B15/00—Escapements
    • G04B15/14—Component parts or constructional details, e.g. construction of the lever or the escape wheel
    • 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
    • G04B23/00—Arrangements producing acoustic signals at preselected times
    • G04B23/02—Alarm clocks
    • G04B23/026—Hammer driving; hammers; devices with several hammers or sounding bodies; vibrators
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/02—Shock-damping bearings
    • 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
    • G04B5/00—Automatic winding up
    • G04B5/02—Automatic winding up by self-winding caused by the movement of the watch
    • G04B5/16—Construction of the weights
    • G04B5/165—Weights consisting of several parts
    • 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
    • G04B21/00—Indicating the time by acoustic means
    • G04B21/02—Regular striking mechanisms giving the full hour, half hour or quarter hour
    • G04B21/08—Sounding bodies; Whistles; Musical apparatus
    • 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
    • G04B23/00—Arrangements producing acoustic signals at preselected times
    • G04B23/02—Alarm clocks
    • G04B23/023—Driving, e.g. by springs or common drive with the clockwork; gears; escapements
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/06—Manufacture or mounting processes

Definitions

  • the invention relates to a clock striking mechanism, comprising a fixed structure carrying at least one stamp or radiating element and a hammer movable in a plane relative to said fixed structure under the action of a mobile d activation, which comprises said mechanism, and which is arranged to control the lifting of said hammer and its release for the percussion of at least one said stamp or radiating element.
  • the invention also relates to a watch which includes means for storing and / or generating energy, and a clockwork movement, which are arranged to drive such a striking mechanism.
  • the invention relates to the field of clock striking or alarm mechanisms.
  • the invention relates to the striking and alarm mechanisms, and in particular to the hammer actuation system which these mechanisms comprise.
  • timbre activation mechanisms of conventional construction which typically include an anchor or a lift which activates a hammer, which itself strikes a timbre or radiating element, are often limited, and in particular irregular.
  • the sound intensity of the ring varies during the power reserve of the mechanism.
  • the invention proposes to improve the quality and regularity of the percussion in a striking or alarm mechanism.
  • the invention relates to a clock striking mechanism according to claim 1.
  • the invention also relates to a watch which includes means for storing and / or generating energy, and a clockwork movement, which are arranged to drive such a striking mechanism.
  • the invention relates to striking and alarm mechanisms, and more particularly to the hammer actuation system.
  • the invention proposes to use flexible guides for guiding and returning the stamp hammer.
  • the most basic mechanism is shown schematically in the figure 1 , which shows a hammer suspended by at least one flexible guide, here shown without limitation in the form of a flexible guide with two elastic blades crossed in projection, which guides it in a substantially planar stroke.
  • the mechanism of the figure 1 works in the following way: an activation mobile, in particular an activation wheel, or even a lift, lifts the hammer, and moves it away from its rest position to carry out the arming, until the tooth that the hammer comprises no longer meshes with the wheel in the example illustrated.
  • the hammer then falls, under the action of the energy contained in the spring, during disarming, and comes to strike the stamp or radiating element.
  • the activation wheel engages the hammer again, and the operation is repeated in the same way.
  • the hammer rest position remains to be defined. It seems that a hammer rest position very close to the impact position is preferable. A solution with a pre-stressed hammer is also possible.
  • the preload regulates the energy stored in the hammer.
  • the advantage of the presence of a flexible guide has the advantage of precisely positioning the hammer, and above all of having no play. This makes it possible to eliminate the usual parasitic noise caused in existing ringtones by the play of the mechanical pivot of the hammer. Flexible guidance precisely defines the energy stored in the hammer. The system is therefore able to supply the same amount of energy for each percussion.
  • the figures 2 to 4 illustrate a variant which consists in modifying the dynamic rigidity of the flexible guide, by interposing an obstacle on the path of at least one blade which this flexible guide comprises, in its operating range.
  • the figure 2 illustrates an intermediate position of the hammer cocking
  • the figure 3 shows the position where the hammer is fully cocked
  • the figure 4 illustrates the trigger and the start of the hammer stroke towards its percussion position, just before impact the flexible guide comes into abutment with a pin, or another fixed obstacle, before the hammer contacts the stamp or radiating element.
  • this abutment cooperation can occur at the instant of impact.
  • the rigidity of the mechanism in the position of the figure 3 is weaker than in the position of the figure 4 , because the active length of the blade, from the embedding on the side of the plate to the hammer is greater in figure 3 that figure 4 ; of course in the position of the figure 4 the whole blade is deformed, but it is more rigid there than at the figure 3 .
  • This principle is comparable to that of a catapult, or of the neolithic propellant.
  • a variant of the invention is based on the principle, illustrated by the figure 5 how wooden rocking horses work.
  • This mechanism is known as the “four bar mechanism”. It is interesting because the horse normally rocks at low amplitude, and performs a high amplitude kicking. By transposing this principle by replacing the horse with a hammer, the latter can be accelerated, in the manner of the horse's kicking, just before impact against the stamp or radiating element. Despite the apparent simplicity of the mechanism, the sizing is relatively complex. There are a multitude of solutions and possibilities. The trajectories of the guided elements and the speeds of the mobiles can be defined according to the desired embodiment.
  • the four bar system or other equivalent flexible guide, is dimensioned so as to accelerate the hammer just before striking. This is one of the main advantages of this mechanism.
  • a stop such as a pin or the like, which modifies the rigidity / dynamics of the flexible guide on the system of figures 7 to 10 , according to the principle indicated in the figure 4 .
  • Another variant of the invention is based on a magnetic type exhaust mechanism according to demand CH01421 / 16 or demand EP16195405.2 on behalf of The Swatch Group Research & Development Ltd, and comprises a hammer on a flexible guide, with crossed blades in projection, and carrying magnets arranged to cooperate with other magnets carried by an escape wheel.
  • This variant is very simple, it suffices to transpose the teachings of this escape mechanism for the activation of a striking hammer in place of the resonator as illustrated in the figure 11 .
  • the figure 12 illustrates another variant which uses a flexible linear guide to activate the hammer, with an activation wheel cooperating with reliefs of a movable frame, as described in particular in the patent EP2831677B1 on behalf of Nivarox-FAR SA, relating to a movable frame exhaust mechanism.
  • This mechanism allows for a linear percussion instead of an angular percussion, which can be advantageous for dimensions.
  • the flexible guides allow for a multitude of movements. It is in particular possible to carry out a virtual pivoting of the hammer.
  • the invention thus relates to a striking mechanism 100 for timepieces, comprising a fixed structure 1 carrying at least one stamp or radiating element 2 and a hammer 3 movable relative to the fixed structure 1 under the action of an activation mobile 4, which includes the mechanism 100.
  • This mobile activation 4 is arranged to control the lifting of the hammer 3 and its release for the percussion of at least one stamp or radiating element 2.
  • the striking mechanism 100 comprises, for the suspension of the hammer 3, at least one flexible guide 10, which is arranged between the fixed structure 1 and the hammer 3 to allow movements of the hammer 3, and which constitutes the only permanent mechanical connection between the fixed structure 1 and the hammer 3.
  • the mechanism 100 includes flexible guides 10 of the planar type.
  • the striking mechanism 100 is arranged to drive the activation mobile 4, for the execution of a striking, and to make it perform an arming cycle during which it supplies a certain amount of energy to the flexible guide 10 concerned (which stores a constant amount of energy) by driving the hammer 3, before releasing the hammer 3 for the execution of the striking by striking at least one timbre or radiating element 2 by the hammer 3 during disarming with a constant amount of energy corresponding to the energy accumulated in this flexible guide 10.
  • At least one flexible guide 10 is plane, and is arranged between the fixed structure 1 and the hammer 3 to allow movements of the hammer 3 only in a single plane P.
  • the hammer 3 is movable in such a plane P
  • at least one flexible guide 10 is of the planar type and comprises a plurality of elastic blades 11 which extend in the plane P or in several parallel planes at the plane P, and which are either parallel to each other, or crossed in projection on the plane P at the level of a virtual pivot axis D.
  • At least one flexible guide 10 comprises at least one bistable or multistable elastic blade.
  • the striking mechanism comprises at least one flexible guide 10 which is arranged to guide the hammer 3 in its cocking and disarming strokes in a plane P, and to accelerate the hammer 3 at the end of disarming stroke.
  • At least one flexible guide 10 comprises at least one first elastic blade arranged to guide the hammer 3 in its winding and disarming strokes in a plane P, and at least one second elastic blade arranged to accelerate the hammer 3 at the end of the stroke. disarmament.
  • At least one of the flexible guides 10 comprises a reinforced blade 12, which is arranged to cooperate, in particular in its middle part, in abutment support, during the disarming stroke and before the hammer 3 is struck. on a stamp or radiating element 2, with a fixed stop 13 secured to the fixed structure 1, so as to accelerate the hammer 3 just before its impact on the stamp or radiating element 2.
  • the hammer 3 comprises a first winding tooth 14 arranged to cooperate with an activation tooth 15 which the activation mobile 4 comprises during the winding phase for the pivoting drive of the hammer 3 , and the hammer 3 comprises, at a distance from the first winding tooth 14, a striker 17 arranged to strike a stamp or radiating element 2, and the striking mechanism 100 comprises a flexible guide 10 near the first tooth armament 14 and near the striker 17.
  • the hammer 3 comprises a first winding tooth 14 arranged to cooperate with an activation tooth 15 which the activation mobile 4 comprises during the winding phase for the pivoting drive of the hammer 3, and the flexible guide 10 comprises at least a first elastic blade close to the first winding tooth 14, and the hammer 3 comprises, at a distance from the first winding tooth 14, a striker 17 arranged to strike a stamp or radiating element 2 , and the flexible guide 10 comprises at least one second elastic blade near the striker 17.
  • the striking mechanism 100 comprises a striking barrel and / or a means of energy storage and distribution
  • the hammer 3 comprises a first winding tooth 14 arranged to cooperate with a tooth of activation 15 that the activation mobile 4 includes during the arming phase for the pivoting drive of the hammer 3, and a second anti-detachment tooth 16 arranged to be inserted, at the end of arming and at minus the start of disarming, between two other activation teeth 15, in order to avoid any uncontrolled unwinding of said ring barrel and / or energy storage and distribution means.
  • the hammer 3 comprises at least one hammer magnet 23 or a ferromagnetic hammer element, arranged to cooperate with a ferromagnetic mobile element or a mobile magnet 24, for driving and releasing the hammer 3 by the activation mobile 4.
  • the hammer 3 is driven by a substantially rotary movement or a combination of rotary movements.
  • the hammer 3 is driven in a longitudinal movement. More particularly, the hammer 3 comprises a movable frame 33 guided longitudinally in bearings 34, the frame 33 internally comprising a chamber 35 in which rest spouts 36 are arranged to cooperate with activation teeth 15 which the movable activation 4.
  • the hammer 3 and the flexible guide (s) 10 which carry it, as well as the stamp or radiating element 2 with which the hammer 3 cooperates are, in projection on the plane P, symmetrical with respect to a perpendicular plane on plane P.
  • the striking mechanism 100 comprises, for the suspension of the hammer 3, several flexible guides 10 planes, distinct and distant from each other.
  • the striking mechanism 100 comprises several hammers 3 and several stamps or radiating elements 2.
  • the hammer 3 and one of the flexible guides 10 which carry it together constitute a resonator arranged to regulate the ringing.
  • the invention also relates to a watch 1000 comprising means for storing and / or generating energy 200 and a clockwork movement 300 arranged to drive a striking mechanism 100.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromechanical Clocks (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP18210745.8A 2018-12-06 2018-12-06 Schlagwerkmechanismus einer uhr mit hängehammer Active EP3663869B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18210745.8A EP3663869B1 (de) 2018-12-06 2018-12-06 Schlagwerkmechanismus einer uhr mit hängehammer
US16/683,554 US11754976B2 (en) 2018-12-06 2019-11-14 Suspended-hammer timepiece striking mechanism
JP2019216208A JP6872596B2 (ja) 2018-12-06 2019-11-29 吊下げハンマ式の時計の時打ち機構
CN201911241846.3A CN111290230B (zh) 2018-12-06 2019-12-06 悬锤式时计敲击机械装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18210745.8A EP3663869B1 (de) 2018-12-06 2018-12-06 Schlagwerkmechanismus einer uhr mit hängehammer

Publications (2)

Publication Number Publication Date
EP3663869A1 true EP3663869A1 (de) 2020-06-10
EP3663869B1 EP3663869B1 (de) 2021-06-16

Family

ID=64650250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18210745.8A Active EP3663869B1 (de) 2018-12-06 2018-12-06 Schlagwerkmechanismus einer uhr mit hängehammer

Country Status (4)

Country Link
US (1) US11754976B2 (de)
EP (1) EP3663869B1 (de)
JP (1) JP6872596B2 (de)
CN (1) CN111290230B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4105733A1 (de) * 2021-06-15 2022-12-21 Montres Breguet S.A. Perkussionsschlagwerk, insbesondere für uhren

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4105734B1 (de) * 2021-06-15 2025-04-16 Montres Breguet S.A. Mikromechanischer mechanismus, der mit einem schlag-betätigungssystem ausgestattet ist, insbesondere für uhren
EP4310605B1 (de) * 2022-07-20 2025-12-17 The Swatch Group Research and Development Ltd Uhrwerk mit einem schlagwerk, das mit einer flexiblen führung ausgestattet ist

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH142116A (de) 1928-10-31 1930-09-15 Jacob Holm & Sonners Fabriker Kreuzspule aus Bindfaden oder dergleichen.
WO2012010408A1 (fr) * 2010-07-19 2012-01-26 Nivarox-Far S.A. Mecanisme oscillant a pivot elastique et mobile de transmission d'energie
CH706468A2 (fr) * 2012-05-02 2013-11-15 Patek Philippe Sa Geneve Mécanisme de sonnerie.
EP2831677B1 (de) 2012-03-29 2016-05-25 Nivarox-FAR S.A. Flexibler uhrhemmungsmechanismus
WO2018193365A1 (fr) * 2017-04-18 2018-10-25 Patek Philippe Sa Geneve Dispositif de blocage pour l'horlogerie
EP3483666A1 (de) * 2017-11-10 2019-05-15 Patek Philippe SA Genève Vorrichtung zur rotationssteuerung einer beweglichen komponente

Family Cites Families (16)

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Publication number Priority date Publication date Assignee Title
DE4012059A1 (de) 1990-04-13 1991-10-17 Int Watch Co Iwc Repetieruhr
JP4612277B2 (ja) 2001-03-21 2011-01-12 グラスヒュッター・ウーレンベトリープ・ゲーエムベーハー 時打ちを備えた時計
EP2048548B8 (de) 2007-10-10 2022-02-16 Richemont International S.A. Schlagwerk
CH701201B1 (fr) 2009-06-11 2014-05-15 Richemont Int Sa Mécanisme de sonnerie pour pièce d'horlogerie et pièce d'horlogerie munie d'un tel mécanisme.
EP2290480B1 (de) 2009-08-26 2012-04-25 Montres Breguet SA Glocke für ein Schlagwerk einer Uhr
EP2320282B1 (de) 2009-11-06 2012-06-20 Montres Breguet SA Schlagwerkmechanismus mit schalldämmender Anordnung für eine Glocke einer Armbanduhr
CH702424A1 (fr) * 2009-12-24 2011-06-30 Montres Breguet Sa Mécanisme de sonnerie d'une montre.
EP2362278B1 (de) 2010-02-26 2016-10-12 Montres Breguet SA Hammer für Schlagwerkmechanismus einer Armbanduhr
CH704199A2 (fr) * 2010-12-10 2012-06-15 Montres Breguet Sa Mecanisme de sonnerie d'une montre ou d'une boite a musique.
EP2463731B1 (de) * 2010-12-10 2015-06-17 Montres Breguet SA Schlagwerkmechanismus einer Armbanduhr
CH704392A1 (fr) * 2011-01-28 2012-07-31 Montres Breguet Sa Mécanisme de sonnerie d'une montre à blocage du marteau.
JP5955004B2 (ja) * 2011-02-07 2016-07-20 モントル チュードル ソシエテ アノニム 時計ムーブメント部品
CH707078A1 (fr) * 2012-10-15 2014-04-15 Société Anonyme De La Manufacture D Horlogerie Audemars Piguet & Cie Timbre pour dispositif de sonnerie d'une pièce d'horlogerie.
CH710759A2 (fr) 2015-02-20 2016-08-31 Nivarox Far Sa Oscillateur pour une pièce d'horlogerie.
EP3070540B1 (de) 2015-03-18 2017-11-15 Glashütter Uhrenbetrieb GmbH Schlagwerk für eine uhr mit einem hammer mit federndem einstellbarem anschlag
EP3079024B1 (de) * 2015-04-09 2018-07-25 Montres Breguet S.A. Magnetischer aktivierungsmechanismus für schlagwerke einer uhr

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH142116A (de) 1928-10-31 1930-09-15 Jacob Holm & Sonners Fabriker Kreuzspule aus Bindfaden oder dergleichen.
WO2012010408A1 (fr) * 2010-07-19 2012-01-26 Nivarox-Far S.A. Mecanisme oscillant a pivot elastique et mobile de transmission d'energie
EP2831677B1 (de) 2012-03-29 2016-05-25 Nivarox-FAR S.A. Flexibler uhrhemmungsmechanismus
CH706468A2 (fr) * 2012-05-02 2013-11-15 Patek Philippe Sa Geneve Mécanisme de sonnerie.
WO2018193365A1 (fr) * 2017-04-18 2018-10-25 Patek Philippe Sa Geneve Dispositif de blocage pour l'horlogerie
EP3483666A1 (de) * 2017-11-10 2019-05-15 Patek Philippe SA Genève Vorrichtung zur rotationssteuerung einer beweglichen komponente

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4105733A1 (de) * 2021-06-15 2022-12-21 Montres Breguet S.A. Perkussionsschlagwerk, insbesondere für uhren
US12248279B2 (en) 2021-06-15 2025-03-11 Montres Breguet S.A. Impact striking mechanism, in particular for timepieces

Also Published As

Publication number Publication date
JP6872596B2 (ja) 2021-05-19
JP2020091287A (ja) 2020-06-11
EP3663869B1 (de) 2021-06-16
CN111290230A (zh) 2020-06-16
US11754976B2 (en) 2023-09-12
US20200183333A1 (en) 2020-06-11
CN111290230B (zh) 2021-07-20

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