EP3644132B1 - Armbanduhr mit schlagwerk oder musik, die mit mindestens einer schallabstrahlmembran ausgestattet ist, und herstellungsverfahren dieser membran - Google Patents

Armbanduhr mit schlagwerk oder musik, die mit mindestens einer schallabstrahlmembran ausgestattet ist, und herstellungsverfahren dieser membran Download PDF

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Publication number
EP3644132B1
EP3644132B1 EP18202869.6A EP18202869A EP3644132B1 EP 3644132 B1 EP3644132 B1 EP 3644132B1 EP 18202869 A EP18202869 A EP 18202869A EP 3644132 B1 EP3644132 B1 EP 3644132B1
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EP
European Patent Office
Prior art keywords
membrane
watch
bezel
edge portion
crystal
Prior art date
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Application number
EP18202869.6A
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English (en)
French (fr)
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EP3644132A1 (de
Inventor
Jérôme Favre
Mehdi Denden
Alain Delizée
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Blancpain SA
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Blancpain SA
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Publication date
Application filed by Blancpain SA filed Critical Blancpain SA
Priority to EP18202869.6A priority Critical patent/EP3644132B1/de
Priority to JP2019184901A priority patent/JP6783367B2/ja
Priority to US16/598,258 priority patent/US11640142B2/en
Priority to CN201911014845.5A priority patent/CN111103783B/zh
Publication of EP3644132A1 publication Critical patent/EP3644132A1/de
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Publication of EP3644132B1 publication Critical patent/EP3644132B1/de
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    • 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
    • G04B21/00—Indicating the time by acoustic means
    • 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
    • G04B23/00—Arrangements producing acoustic signals at preselected times
    • G04B23/02—Alarm clocks
    • G04B23/028—Sounding bodies; boxes used as sounding cases; fixation on or in the case
    • 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
    • G04B37/00—Cases
    • G04B37/0075—Cases with means to enhance sound transmission
    • 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
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses

Definitions

  • the invention relates to a striking or musical watch provided with at least one acoustic radiation membrane, in accordance with claim 1.
  • the invention also relates to a method of manufacturing an acoustic radiation membrane for a striking or musical watch, in accordance with claim 10.
  • the acoustic efficiency on the basis of the complex vibro-acoustic transduction of the casing parts, is low.
  • the material, the geometry and the boundary conditions of the covering parts must be taken into account.
  • the configurations of the casing parts are also dependent on the aesthetics of the watch and the operating constraints, which can limit the possibilities of adaptation.
  • the vibro-acoustic performance of the striking mechanism provision is made for placing one or more membranes in the watch case.
  • the membranes are sized and configured so that the note or notes generated in the watch case are radiated effectively.
  • the frequencies of the notes generated must be close to the proper modes of vibration of the membrane(s) so that they enter into resonance.
  • the patent application EP 0 028 429 A1 describes a watch with an electro-acoustic warning device. This feature is intended to improve sound performance and sound quality.
  • the watch crystal is held in place by a support ring on the middle.
  • This support ring is an annular vibrating membrane. Between two edges of the membrane, there is provided a central curved zone.
  • a central rod is attached to the ice and activated by an excitation electromagnet for vibration.
  • the membrane can be obtained by electroforming.
  • the generation of a sound is obtained by the action of an electronic device excited by an alternating current, which does not provide the same quality of a sound generated by a striking mechanism with mechanical action, which constitutes a inconvenience.
  • Licences EP 2 409 200 B1 and EP 2 738 625 B1 describe a watch case with a middle closed on one side by a bezel and a crystal and on the other side by a back.
  • the bezel and the crystal are connected by an annular elastic metal member in the form of a bellows with at least one annular bend of curvature between 90° and 180° to give the bezel and crystal connected to the bellows freedom of movement perpendicular or parallel to a dial.
  • annular elastic metal member in the form of a bellows with at least one annular bend of curvature between 90° and 180° to give the bezel and crystal connected to the bellows freedom of movement perpendicular or parallel to a dial.
  • these patents highlight the particular shape of the membrane while exploiting it to add free movement to the bezel and not as a radiating element for a chime.
  • the natural oscillation frequency of the assembly made up of the glass and the metal component is higher than the frequency band of the signal transmitted so as not to have any degradation or distortion of the sound, which does not allow the sound to be radiated effectively. generated sound. This therefore constitutes a disadvantage.
  • the object of the invention is therefore to overcome the drawbacks of the state of the art by providing a striking or musical watch provided with at least one acoustic radiation membrane arranged to produce a rich sound with better acoustic radiation of the vibrations at low frequency via the membrane linked to a crystal or a bezel linked to a crystal in the watch case.
  • the invention relates to a striking or musical watch mentioned above, which comprises the characteristics defined in independent claim 1.
  • the membrane is configured in such a way that when it is excited by generating a sound coming from at least one gong or a blade of a vibrating keyboard , there is a transmission of transverse waves.
  • the thin membrane connects on one side a bezel fixed to a crystal or directly a watch crystal, and on the other side a middle part of a watch case.
  • the bezel with the glass or the glass alone become mobile and vibrate at the same modes of vibration as the membrane in order to to reach vibration modes below 4 kHz, or at 1 kHz or even lower depending on the thickness of the membrane and/or its curvature as well.
  • the membrane acts as a spring in conjunction with the bezel-glass or the glass which constitutes the mass.
  • the frequency of the first mode of vibration depends on the square root of the stiffness on the mass. This first mode of vibration is of the piston type. Thus, the lower the stiffness of the membrane, the lower the frequency of the first mode of vibration, which is sought.
  • the membrane can be manufactured by an electroforming process. It can be made with a thickness of less than 80 ⁇ m, for example up to 37 ⁇ m, which makes it possible to lower the radiation frequency down to 500 Hz while allowing good acoustic radiation up to frequencies around 8 to 10kHz. By working at such a low frequency, this results in a warmer, louder sound, because the more modes there are radiated, the more the human ear interprets this as a loud sound, and more distinguishable when generating a music.
  • the membrane can be made of a metallic material, such as 5N gold.
  • the invention also relates to a method of manufacturing at least one acoustic radiation membrane for a striking or musical watch, which comprises the characteristics defined in independent claims 10 and 11.
  • a particular manufacturing step is defined in dependent claim 12.
  • the figure 1 therefore represents a first embodiment of a mechanical striking or musical watch 1, which comprises at least one acoustic radiation membrane 2.
  • This acoustic radiation membrane 2 is made of metallic material or amorphous metal and is presented as a piece of connection in the form of a walled loop of a certain thickness. It can be considered as a membrane-spring.
  • This membrane 2 is designed to be connected by a first border 23 to a middle part 4 of a watch case, in particular on the upper part of the middle part 4, and by a second border 20 to a bezel 3 fixed to a watch crystal. 5 via a seal 12.
  • the second edge 20 of the membrane 2 can also be directly connected to a watch crystal 5.
  • first edge 23 of the membrane 2 can be fixed on the upper part of the middle part 4, in particular in an annular groove by means of a complementary bezel 13.
  • This complementary bezel can be fixed by screwing on the upper part of the middle part 4 or by gluing or welding or brazing or by being driven out so that the lower portion of the complementary bezel 13 comes to fix the first edge in the annular groove of the middle part 4.
  • the complementary bezel 13 can still serve as protection of the assembly comprising the bezel 3 linked to the crystal 5 and to the membrane 2.
  • the striking or musical watch 1 further comprises a striking mechanism represented only by a certain number of gongs 9 arranged in this configuration under the dial 6 of the watch.
  • the striking mechanism is connected to a watch movement 14 arranged between the dial 6 and a back 7, which is fixed to a lower part of the middle part 4 with a sealing gasket 8.
  • These gongs 9 spaced from one another can each be struck by a particular hammer not shown normally at specific times to each generate a different sound and which can also generate a melody.
  • It can also be provided to have a keyboard with blades of different lengths, not shown, to be activated by a disc or cylinder with blade activation members in order to generate music according to the arrangement of the activation members.
  • the membrane 2 is annular in shape with an arcuate or curved part, which is directed towards the side of the watch crystal 5 in an active zone 11 of the membrane 2 in a direction Z perpendicular to the plane of the watch.
  • the arcuate part is a portion of a circle according to a cross section as shown, which is extended by a straight part, defining a frustoconical portion, up to connection with the first border 23.
  • the second border 20 of the membrane 2 is fixed by a fixing ring 10, which is driven for example onto an outer cylindrical wall of the bottom of the bezel 3.
  • the bezel 3 also includes an upper edge, where the watch crystal 5 rests, fixed by the seal 12 to an inner upper wall of the bezel 3.
  • a lower and inner edge of the bezel 3 is above the dial 6 without touching it. to allow mobility of the bezel 3 with the glass 5 held by the membrane 2.
  • a space between 70 and 100 ⁇ m is provided between the bezel 3 and the dial 6 or between the bezel 3 and the complementary bezel 13 to leave mobility to the membrane 2 and bezel 3 assembly.
  • the bezel 3 linked to the crystal 5 or the crystal 5 is mobile with respect to the middle part 4 via the membrane 2 during the vibration of the membrane 2 following a sound generated by the striking mechanism of the watch in the watch case.
  • the bezel 3 connected to the membrane 2 vibrates at the same vibration modes as the membrane 2, which are significantly lower than the vibration modes of a conventional casing.
  • the thickness of the membrane 2 of the spring type it is preferred to lower the thickness of the membrane 2 of the spring type to reduce the frequency fo of the first mode of vibration by decreasing the stiffness k of the membrane 2.
  • the excitation of the membrane 2 is therefore done by a transmission of transverse waves generated by the vibration of one or more gongs 9 arranged below the dial in this first embodiment.
  • Such a membrane 2 in connection with the bezel 3 with the glass 5 or only in connection with the glass 5 can cover an acoustic radiation band of 1 kHz to 10 kHz with the trim parts. If the thickness of the membrane 2 is reduced to reduce its stiffness following a manufacturing process by electroforming explained below, the acoustic radiation band can even be between 500 Hz and 10 kHz.
  • a sapphire crystal 5 with a thickness of 2 mm and a diameter of the order of 37.8 mm with a bezel 3 made of metal, such as gold of so as to have a mass of the order of 13 grams.
  • the bezel 3 is annular in shape with an inside diameter of around 36 mm and an outside diameter of around 41.9 mm, and a thickness of around 3.55 mm.
  • the membrane 2, which can be electro-formed as explained below with reference to the figure 4a at 4th can be made preferably in 5N gold to match the desired resonance frequency, because also a large part of the trim elements are in gold.
  • the active zone 11 of the membrane can be a space between the bezel 3 and the complementary bezel 13 1.2 mm wide by 2 mm high in Z direction.
  • the figure 2a at 2c represent several embodiments of the annular membrane, of which a cross-section of one side is shown, according to the invention.
  • the membrane 2 according to the invention has an arcuate part 21, the circle portion angle of which is greater than 180° from the second edge 20 to a straight part 22 connecting to the first edge 23.
  • the membrane 2 has an arcuate part 21, the angle of the circle portion of which is substantially equal to 180° from the second edge 20 to a straight part 22 connecting to the first border 23.
  • the membrane 2c which also shows an embodiment not covered in the claims, the membrane 2 has an arcuate part 21, the angle of the circle portion of which is substantially less than 180° from the second edge 20 to a straight part 22 connecting at the first border 23.
  • the curvature of the membrane 2 in its active zone can also play a role in its stiffness and also influence the lowering of the frequency of the first vibration mode under the effect of a force in the Z direction, given the size reduced, where the membrane is located 2.
  • the thickness of the membrane is substantially the same, for example of a determined thickness which may be of the order of 80 ⁇ m and may be lowered to a thickness of the order of 37 ⁇ m for reduce the frequency of the first mode of vibration towards 500 Hz for a 5N gold membrane with an ice-bonded bezel as shown above.
  • This provides the advantage of working at low frequency and obtaining a warmer, stronger sound, since there are several radiated modes interpreted by the human ear as a loud sound, and more distinguishable in the case of the reproduction of a set of notes to play a melody.
  • the picture 3 shows a partial cross-sectional view of a striking or musical watch having a membrane at the level of the crystal and the middle of the watch case according to a second embodiment of the invention.
  • the only difference of this second form of execution resides at the level of the second edge 20 of the membrane 2.
  • This second edge comprises a heel 20 used to start the manufacture of the membrane by electroforming.
  • annular-shaped metallic ring 20 is obtained.
  • this annular ring 20 can be made of 5N gold, even if other metallic materials can be envisaged.
  • a low-cut substrate 30 is produced as a base for producing the membrane by electroforming.
  • This substrate has a profile complementary to the shape of the membrane to be produced. This substrate must be able to be dissolved at the end of the membrane manufacturing process without damaging the membrane.
  • the substrate comprises an annular cavity 31 of the dimension of the annular ring.
  • the annular ring 20 is driven into the annular cavity 31 of the substrate 30.
  • This annular ring is at the mouth of the cavity and will serve as a starting point for the formation of the membrane.
  • the membrane is produced from the heel 20 and on the substrate 30 of its complementary shape by electroforming with a metallic material such as 5N gold.
  • the membrane is formed with its annular arcuate part 21 and of which, according to a cross section, the angle at rest has an angle greater than 180°, its straight part 22 and the first edge 23.
  • the second edging is tied directly to the 20 heel.
  • the substrate is dissolved to keep only the membrane with its parts 20 to 23.
  • a refining can still be planned by immersing the membrane in an electroforming bath to finish the part, in particular to refine its thickness. Subsequently, the membrane can be fixed in the striking watch, in particular between the moving bezel and the middle part.

Claims (12)

  1. Armbanduhr (1) mit Schlagwerk oder Musik, die mit mindestens einer Schallabstrahlmembran (2) aus einem metallischen Werkstoff oder einem amorphem Metall ausgestattet ist, wobei die Membran (2) die Form einer Schleife hat mit einer Wandung einer gewissen Dicke, um durch eine erste Kante (23) an einem Mittelteil (4) eines Uhrgehäuses befestigt zu werden und durch eine zweite Kante (20) an eine Lunette (3), die an einem Uhrenglas (5) fixiert ist, oder direkt an das Uhrenglas (5), wobei die Lunette (3), die mit dem Glas (5) verbunden ist, oder das Glas (5) beweglich sind in Bezug auf das Mittelteil (4), mittels der Membran (2), während der Schwingung der Membran (2) im Anschluss an einen Ton, der durch einen Schlagwerkmechanismus der Armbanduhr im Uhrgehäuse erzeugt wurde,
    dadurch gekennzeichnet, dass die Membran (2) konfiguriert ist mit einer Wandung einer bestimmten Dicke in einer aktiven Zone (11), die von der Masse der Lunette (3) abhängig ist, die mit dem Glas (5) verbunden ist, oder nur des Glases (5), um eine Frequenz fo eines ersten Schwingungsmodus zu haben, die bei Niederfrequenz kleiner oder gleich 4 kHz ist nach der Gleichung fo = (1/2TT)·(k/m)1/2, wobei k die Steifigkeit der Membran (2) ist, die von ihrer Dicke abhängt, und m die Masse der Lunette (3) ist, die mit dem Glas (5) verbunden ist, oder nur des Glases (5), und dass die Membran (2) ringförmig ist mit einem gewölbten ringförmigen Bereich (21), der von der zweiten Kante (20) ausgeht und in eine Richtung des Glases (5) senkrecht zur Ebene der Armbanduhr (1) gerichtet ist, wobei sich der gewölbte Bereich (21) durch einen geraden Bereich (22) fortsetzt, der an der ersten Kante (23) befestigt ist, und
    dass der gewölbte ringförmige Bereich (21) gemäß einem Querschnitt ein Kreisabschnitt ist, dessen Ruhewinkel größer als 180° ist.
  2. Armbanduhr (1) nach Anspruch 1, dadurch gekennzeichnet, dass der gewölbte ringförmige Bereich (21) und der gerade Bereich (22) dieselbe Dicke haben.
  3. Armbanduhr (1) nach Anspruch 1, dadurch gekennzeichnet, dass der gerade Bereich (22) eine abgestumpfte Form hat.
  4. Armbanduhr (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Dicke der Membran (2) zwischen der ersten Kante (23) und der zweiten Kante (20) kleiner oder gleich 80 µm ist, um eine Frequenz fo eines ersten Schwingungsmodus kleiner oder gleich 1 kHz zu haben, in einem Schwingungsmodus in Verbindung mit der Lunette (3) oder dem Glas (5).
  5. Armbanduhr (1) nach Anspruch 4, dadurch gekennzeichnet, dass die Dicke der Membran (2) zwischen der ersten Kante (23) und der zweiten Kante (20) kleiner oder gleich 40 µm ist, um eine Frequenz fo eines ersten Schwingungsmodus im Bereich von 500 Hz zu haben, in einem Schwingungsmodus in Verbindung mit der Lunette (3) oder dem Glas (5).
  6. Armbanduhr (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Membran durch Elektroformung mit Gold 5N erhalten wird, in Verbindung mit der Lunette (3) aus Gold.
  7. Armbanduhr (1) nach Anspruch 1, dadurch gekennzeichnet, dass die zweite Kante (20) der Membran (2) durch eine Fixierungsbüchse (10) fixiert ist, die in einer äußeren zylindrischen Wandung der Unterseite der Lunette (3) eingepresst oder eingelötet ist.
  8. Armbanduhr (1) nach Anspruch 1, dadurch gekennzeichnet, dass die zweite Kante einen Steg (20) umfasst, der während der Herstellung der Membran (2) durch Elektroformung erhalten wurde, wobei dieser Steg eine ringförmige Büchse ist, die die Membran (2) durch Einpressen in einer äußeren zylindrischen Wandung der Unterseite der Lunette (3) fixiert.
  9. Armbanduhr (1) nach Anspruch 1, dadurch gekennzeichnet, dass sie eine komplementäre Lunette (13) umfasst, die über der Lunette (3) angeordnet ist und als Schutz dient, und um die erste Kante (23) der Membran (2) an einem oberen Bereich des Mittelteils (4) zu fixieren.
  10. Verfahren zur Herstellung einer Membran (2) für eine Armbanduhr (1) mit Schlagwerk oder Musik nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es die Schritte umfasst, zum:
    - Bereitstellen eines fassongedrehten Substrats (30) mit einer Form, die komplementär zur herzustellenden Membran (2) ist,
    - Herstellen der Membran (2) auf dem Substrat (30) durch Elektroformung mit einem metallischen Werkstoff oder einem amorphen Metall, und
    - Lösen des Substrats, um nur die Membran mit einer ersten Kante (23) zu behalten, einen geraden Bereich (22), einen gewölbten Bereich (21), der gemäß einem Querschnitt ein Kreisabschnitt ist, dessen Ruhewinkel größer als 180° ist, und einer zweiten Kante (20), die in einer bestimmten Dicke erhalten wurden.
  11. Verfahren zur Herstellung einer Membran (2) für eine Armbanduhr (1) mit Schlagwerk oder Musik nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass es die Schritte umfasst, zum:
    - Bereitstellen einer ringförmigen Büchse (20) aus Metall oder amorphem Metall,
    - Bereitstellen eines fassongedrehten Substrats (30) mit einer Form, die komplementär zur herzustellenden Membran (2) ist und einen ringförmigen Hohlraum (31) umfasst, in Form der ringförmigen Büchse (20),
    - Einpressen der ringförmigen Büchse (20) in den ringförmigen Hohlraum (31) des Substrats (30),
    - Herstellen der Membran (2) vom Steg (20) zum Substrat (30) durch Elektroformung mit einem metallischen Werkstoff oder einem amorphen Metall, und
    - Lösen des Substrats, um nur die Membran mit einer ersten Kante (23) zu behalten, einen geraden Bereich (22), einen gewölbten Bereich (21), der gemäß einem Querschnitt ein Kreisabschnitt ist, dessen Winkel größer als 180° ist, und einer zweiten Kante mit dem einteiligen Steg (20), wobei der gewölbte und der gerade Bereich dieselbe bestimmte Dicke haben.
  12. Verfahren nach einem der Ansprüche 10 und 11, dadurch gekennzeichnet, dass die Membran (2) mit oder ohne Steg (20) aus Gold 5N hergestellt ist.
EP18202869.6A 2018-10-26 2018-10-26 Armbanduhr mit schlagwerk oder musik, die mit mindestens einer schallabstrahlmembran ausgestattet ist, und herstellungsverfahren dieser membran Active EP3644132B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18202869.6A EP3644132B1 (de) 2018-10-26 2018-10-26 Armbanduhr mit schlagwerk oder musik, die mit mindestens einer schallabstrahlmembran ausgestattet ist, und herstellungsverfahren dieser membran
JP2019184901A JP6783367B2 (ja) 2018-10-26 2019-10-08 少なくとも１つの音響放射膜を備えるストライク携行式時計又はミュージカル携行式時計、及び音響放射膜を製造する方法
US16/598,258 US11640142B2 (en) 2018-10-26 2019-10-10 Striking or musical watch provided with at least one acoustic radiating membrane and method for manufacturing the membrane
CN201911014845.5A CN111103783B (zh) 2018-10-26 2019-10-24 设有至少一个声辐射膜的报时或音乐手表及制造膜的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18202869.6A EP3644132B1 (de) 2018-10-26 2018-10-26 Armbanduhr mit schlagwerk oder musik, die mit mindestens einer schallabstrahlmembran ausgestattet ist, und herstellungsverfahren dieser membran

Publications (2)

Publication Number Publication Date
EP3644132A1 EP3644132A1 (de) 2020-04-29
EP3644132B1 true EP3644132B1 (de) 2022-06-08

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EP18202869.6A Active EP3644132B1 (de) 2018-10-26 2018-10-26 Armbanduhr mit schlagwerk oder musik, die mit mindestens einer schallabstrahlmembran ausgestattet ist, und herstellungsverfahren dieser membran

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US (1) US11640142B2 (de)
EP (1) EP3644132B1 (de)
JP (1) JP6783367B2 (de)
CN (1) CN111103783B (de)

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EP2881807B1 (de) * 2013-12-09 2019-11-27 Montres Breguet SA Schallabstrahlungsmembran für eine Armbanduhr mit Spieluhr
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US20200133202A1 (en) 2020-04-30
JP6783367B2 (ja) 2020-11-11
JP2020076749A (ja) 2020-05-21
CN111103783A (zh) 2020-05-05
US11640142B2 (en) 2023-05-02
CN111103783B (zh) 2021-06-08
EP3644132A1 (de) 2020-04-29

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