EP3761123A1 - Mikromechanische komponente, die die einschliessung einer schmiersubstanz erlaubt - Google Patents

Mikromechanische komponente, die die einschliessung einer schmiersubstanz erlaubt Download PDF

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Publication number
EP3761123A1
EP3761123A1 EP19184822.5A EP19184822A EP3761123A1 EP 3761123 A1 EP3761123 A1 EP 3761123A1 EP 19184822 A EP19184822 A EP 19184822A EP 3761123 A1 EP3761123 A1 EP 3761123A1
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EP
European Patent Office
Prior art keywords
microstructured
micro
component according
zone
pillars
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
EP19184822.5A
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English (en)
French (fr)
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EP3761123B1 (de
Inventor
Fabienne Marquis Weible
Evelyne Vallat
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.)
ASSOCIATION SUISSE POUR LA RECHERCHE HORLOGERE
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ASSOCIATION SUISSE POUR LA RECHERCHE HORLOGERE
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 ASSOCIATION SUISSE POUR LA RECHERCHE HORLOGERE filed Critical ASSOCIATION SUISSE POUR LA RECHERCHE HORLOGERE
Priority to EP19184822.5A priority Critical patent/EP3761123B1/de
Priority to JP2021577901A priority patent/JP7316391B2/ja
Priority to US17/624,172 priority patent/US20220357706A1/en
Priority to CN202080048923.8A priority patent/CN114026504B/zh
Priority to PCT/IB2020/052901 priority patent/WO2021005423A1/fr
Publication of EP3761123A1 publication Critical patent/EP3761123A1/de
Application granted granted Critical
Publication of EP3761123B1 publication Critical patent/EP3761123B1/de
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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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/08—Lubrication
    • 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
    • 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
    • G04B31/00—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor
    • G04B31/004—Bearings; Point suspensions or counter-point suspensions; Pivot bearings; Single parts therefor characterised by the material used
    • G04B31/008—Jewel bearings

Definitions

  • the present invention relates to a micromechanical component intended for clockwork mechanisms, in particular a component which has to be lubricated.
  • this lubricant can escape from the area where it was deposited.
  • the movement of the parts tends to displace the lubricant from the contact area to an area not subjected to friction.
  • a small size mechanical component such as a timepiece component, it is difficult to form a lubricating film only at a specific region.
  • the sliding portion In order for the sliding portion to retain lubricant to reduce the wear due to the friction caused by the sliding during rotation or the like, it is customary to chemically treat the surface.
  • the chemical state of the surface is obtained by different types of cleaning, optionally followed by coating the part with a film of nanometric thickness, comprising a fluorinated active agent.
  • a fluorinated active agent Different active agents fluorinated compounds are known in the watch industry under the name epilame.
  • the coating of the components with this type of product, outside the contact zone allows the lubricant to be retained in the contact zone thanks to the reduction of the surface energy of the treated part.
  • the ability of the mechanical component to sustainably retain the lubricant after a surface treatment and / or the addition of a film of controlled chemical nature can be improved, with the objective of reducing the wear suffered by the mechanical component of the lubricant. due to insufficient lubricating oil.
  • the document CH713426 describes a first mechanical component having a first surface area, a second component having a second surface area over which the first surface area can slide.
  • An oil retaining film is formed on at least one reception area selected from the first and second surface areas, this oil retaining film being more oleophilic than the reception area.
  • the oil retaining film is a chemical compound comprising one of the elements Si, Ti, and Zr and a hydrocarbon radical.
  • the present disclosure relates to a micromechanical component intended for clockwork mechanisms, at least part of the component being made of a crystalline mineral material based on carbon or alumina comprising at least one contact surface intended to come into sliding contact. and / or in pivoting; the contact surface locally comprising at least one microstructured zone exhibiting a three-dimensional texture; the three-dimensional texture being formed of microcavities, making the microstructured zone more oleophobic than the non-microstructured contact surface, and / or formed of micro-pillars making the microstructured zone more oleophilic than the non-microstructured contact surface; the microstructured zone is configured for locally confining a lubricating substance to a lubricated portion of the contact surface.
  • the component described here improves the containment of the lubricating substance in a portion of the contact surface.
  • different arrangements of oleophilic and oleophobic zones can be provided near or on the contact surface.
  • the microstructured zone therefore makes it possible to control the spatial localization of the lubricating substance in a portion of the contact surface according to the different lubrication applications.
  • the component described here can also improve the supply of the lubricating substance to the contact surface portion.
  • the fig. 1 schematically represents a component 10 of micromechanics intended for clockwork mechanisms, according to one embodiment.
  • the component 10 comprising at least one contact surface 100, at least a portion of the contact surface 100 being intended to come into sliding and / or pivoting contact, for example with another component of a clockwork mechanism.
  • Component 10 is manufactured wholly or in part consisting of a crystalline mineral material based on carbon or alumina (Al 2 O 3 ).
  • the crystalline mineral material is ruby, sapphire or diamond, natural or synthetic.
  • Other materials can also be envisaged, such as polymers, metals or metal alloys, ceramics, silica, glass, silicon, etc.
  • Component 10 made entirely or in part made of a crystalline mineral material, comprises a contact surface 100 locally comprising at least one microstructured zone 110.
  • the microstructured zone 110 can be made more oleophobic than the non-microstructured contact surface 100.
  • the microstructured area 110 can be made more oleophilic than the non-microstructured contact surface 100.
  • the microstructured zone 110 has a three-dimensional texture formed of microcavities 20.
  • the microcavities 20 typically have an essentially frustoconical shape tapering towards the bottom of the cavity 20.
  • the lateral dimension L of the microcavity 20 at the surface level is between 5 ⁇ m and 150 ⁇ m and preferably between 10 ⁇ m and 60 ⁇ m.
  • the ratio of the height H to the lateral dimension L of the microcavity 20 is between 0.01 and 1.
  • the microcavities 20 are non-communicating, that is to say that the cavities 20 do not communicate fluidly with each other.
  • the fig. 3 shows a micrograph (for two magnifications) of a three-dimensional texture comprising microcavities 20 formed in a monocrystalline pellet of traditional watchmaking rubies (Verneuil Al 2 O 3 Cr ruby, cleaved, chopped and polished).
  • the microcavities have a lateral dimension L of approximately 25 ⁇ m.
  • the microstructured area 110 has a three-dimensional texture formed of micro-pillars 30.
  • the micro-pillars 30 typically have an essentially frustoconical shape tapering towards the top of the micro-pillar 30.
  • the lateral dimension L of the micro-pillar 30 at the level of its base is between 5 ⁇ m and 150 ⁇ m and preferably between 10 ⁇ m and 60 ⁇ m.
  • the ratio of the height H to the lateral dimension L of the micro-pillar 30 is between 0.01 and 1.
  • the lateral dimension L of the microcavities 20 and of the micro-pillars 30 of between 10 ⁇ m and 60 ⁇ m is more favorable for watchmaking applications, given the dimensions of the watchmaking components coming into contact.
  • the fig. 5 shows a SEM micrograph (for two magnifications) of a three-dimensional texture comprising 20 micro-pillars formed in the same single crystal ruby pellet as at fig. 3 .
  • the micro-pillars 30 have a lateral dimension L of approximately 25 ⁇ m.
  • the microstructured zone 110 comprises a wavy microstructure 40.
  • the fig. 6 shows a SEM micrograph of the ripple microstructure 40 formed in the same ruby monocrystalline pellet as at fig. 3 .
  • the waving microstructure 40 typically has a double texture consisting of parallel grooves with a typical width between 7 and 12 ⁇ m and a depth of less than 1 ⁇ m (typically 0.2 to 0.9 ⁇ m). Along a groove, the depth is modulated by an oscillation with a micrometric period (typically 1 ⁇ m) and an amplitude of less than 0.2 ⁇ m.
  • the microstructured zone 110 comprises the texture formed of micro-pillars 30 on which the corrugation microstructure 40 is superimposed.
  • fig. 7 shows an SEM micrograph of such a texture produced in the same monocrystalline ruby pellet as in the fig. 3 .
  • microcavities 20 and micro-pillars 30 can be arranged in a regular pattern, for example hexagonal or square, or else in an irregular pattern.
  • the density of the microcavities 20 or of the micro-pillars 30 in the microstructured zone 110 may be between 0.1 and 0.9, and preferably between 0.4 and 0.8.
  • the textures including the corrugation microstructure, the microcavities 20, the micro-pillars 30 and the micro-pillars 30 with the superimposed corrugation microstructure, were made using a femtosecond laser.
  • Other methods of fabricating textures are however conceivable, such as microfabrication, mechanical machining, diamond wire or others.
  • the wettability and the more or less oleophilic or oleophobic nature of the contact surface 100 with respect to a liquid were evaluated by measuring the contact angle on dynamic shots during advancement ( ⁇ CA ) of a drop of liquid injected continuously by a micro-cannula above the contact surface 100 in the absence of the microstructured zone 110 and above the contact surface 100 comprising the microstructured zone 110, for example as shown in fig. 8 .
  • the measurement of the contact angle ⁇ CA was carried out with the Synth-A-lube 9010 watch oil manufactured by the Moebius division of The Swatch Group Research and Development Ltd.
  • the crystalline mineral material is ruby.
  • the contact angle measurements were carried out on the contact surface 100 in the natural state (without preparation), as well as after chemical treatment consisting in this embodiment of a combination of a solvent cleaning followed by an oxygen plasma treatment.
  • This preparation makes it possible to reduce the carbon contamination of the surface to a threshold lower than 10% at. In the natural state (carbon contamination greater than 10% at.)
  • the contact angles are less than 30 °.
  • the contact angle measurements were taken on the contact surface 100 having undergone the above preparation, followed by an epilamage treatment.
  • the contact surface 100 is covered with a very thin film of fluoropolymer.
  • the hair removal treatment is carried out with the standard watchmaker Fixodrop® from Moebius.
  • Table 1 reports the contact angles ⁇ CA measured on the non-microstructured contact surface 100 and on the contact surface 100 including a microstructured zone 110 having a texture formed of microcavities 20, formed of micro-pillars 30 and formed only of the ripple microstructure.
  • the contact angles ⁇ CA were also measured on the contact surface 100 exhibiting a texture formed of micro-pillars 30 on which the corrugation microstructure is superimposed.
  • microcavities 20 having a lateral dimension L of 25.6 ⁇ 0.6 ⁇ m and a depth of 13.8 ⁇ 0.2 ⁇ m, micro-pillars 30 having a lateral dimension L of 15 ⁇ 1 ⁇ m and a height of 8 to 9 ⁇ m, and a ripple microstructure with a valley-top height of 6 ⁇ 0.5 ⁇ m and with a space between the vertices of 0.2 to 0.9 ⁇ m.
  • the microcavities 20 are arranged in a hexagonal pattern and the micro-pillars are arranged in a square pattern.
  • the ripple microstructure is arranged in bands of 10 ⁇ m periodicity.
  • Table 1 Texture Surface condition ⁇ CA non microstructured plasma 29 epilamage 57 microcavities plasma 62 epilamage 125 micro-pillars plasma 21 micro-pillars with corrugation microstructure plasma 19 ripple microstructure plasma 30
  • Table 1 shows that the texture formed of microcavities 20 makes it possible to obtain a contact angle ⁇ CA during advancement of about 62 °, markedly higher than that measured on the non-microstructured contact surface 100 ( ⁇ CA ⁇ 29 °).
  • the contact angle ⁇ CA measured during advancement for the texture formed of microcavities 20 is similar to that measured ( ⁇ CA ⁇ 57 °) for the non-microstructured contact surface 100 comprising an epilame film (epilamage).
  • the texture formed of microcavities 20 comprising the epilame film makes it possible to obtain a contact angle ⁇ CA of approximately 125 °, i.e. double that measured in the absence of the epilame film.
  • the oleophobic character of the texture formed of microcavities comprising the epilame film is particularly remarkable.
  • the oil drop shows pinning effects and as soon as the oil drop comes out of the textured surface, it tends to roll and attach to the non-microstructured surface. adjacent to the microstructured zone 110.
  • the texture formed of micro-pillars 30 results in a contact angle ⁇ CA of about 21 °, therefore significantly lower than those obtained for the texture formed of microcavities 20.
  • the texture formed of micro-pillars 30 comprising the microstructure of superimposed corrugation results in a contact angle ⁇ CA of about 19 °, also significantly lower than those obtained for the texture formed of microcavities 20.
  • the texture formed of micro-pillars 30 with or without superimposed corrugation microstructure is more oleophilic than the non-microstructured contact surface 100.
  • a contact angle ⁇ CA of about 30 ° is measured.
  • the waviness microstructure has very little influence on the contact angle and therefore the oleophilic / oleophobic character of the contact surface 100.
  • the microstructured zone 110 therefore makes it possible to influence the wettability of a watch oil.
  • the texture formed of micro-pillars 30 makes the surface more oleophilic than the non-microstructured contact surface 100 and the texture formed of microcavities 20 makes the surface more oleophobic than the non-microstructured contact surface 100.
  • the microstructured zone 110 comprises a film of a substance making it possible to modify the surface energy.
  • the film may comprise a film of nanometric thickness, comprising a fluorinated active agent.
  • the film may include a film epilame. The addition of such a film on the microstructured zone 110 comprising the texture formed of microcavities 20 makes it possible to further increase by cumulative effect the oleophobic character of the microstructured zone 110.
  • the contact surface 100 comprising the microstructured zone 110 can receive an oxygen plasma treatment, possibly after solvent cleaning.
  • an oxygen plasma treatment increases the oleophobic character of the microstructured zone 110 comprising the texture formed of microcavities 20 and increases the oleophilic character of the microstructured zone 110 comprising the texture formed of micro-pillars 30.
  • microcavities 20 or micro-pillars 30 having a lateral dimension L between 5 ⁇ m and 150 ⁇ m, as well as for microcavities 20 or micro-pillars 30 whose height ratio H on the lateral dimension L of the microcavity 20 is between 0.01 and 1.
  • a density of the microcavities 20 or of the micro-pillars 30 in the microstructured zone 110 comprising the microcavities 20 or of the micro-pillars 30, between 0.1 and 0.9.
  • the contact surface 100 comprises a lubricated portion 120, that is to say a portion of the contact surface 100 intended to receive a lubricating substance (for example a watch oil or others).
  • the lubricated portion 120 may correspond to said at least a portion of the contact surface 100 intended to come into sliding and / or pivoting contact.
  • the microstructured zone 110 extends to the periphery of the lubricated portion 120. In the case where the microstructured zone 110 is more oleophobic than the lubricated portion 120, the microstructured zone 110 will confine the lubricating substance in the lubricated portion 120.
  • the area microstructured 110 may comprise the texture formed of microcavities 20.
  • the lubricated portion 120 of the contact surface 100 is non-microstructured and therefore more oleophilic than the microstructured zone 110.
  • the microstructured zone 110 extends into the lubricated portion 120 and the rest of the contact surface 100 is non-microstructured.
  • the microstructured zone 110 is made more oleophilic than the rest of the contact surface 100 by comprising the texture formed of micro-pillars 30, or possibly of micro-pillars 30 comprising the superimposed corrugation microstructure.
  • the contact surface 100 comprises a first microstructured zone 111 extending to the periphery of the lubricated portion 120 and a second microstructured zone 112 extending into the lubricated portion 120.
  • the first microstructured zone 111 is preferably more oleophobic than the second microstructured zone 112 so as to confine the lubricating substance in the lubricated portion 120.
  • the first microstructured zone 111 can have a texture formed of microcavities 20 and the second microstructured zone 112 can have a texture formed of micro-pillars 30.
  • An advantage of this configuration is that the oleophilic character of the second microstructured zone 112 retains the lubricating substance already in the lubricated portion 120, this confinement being reinforced by the first oleophobic microstructured zone 111 at the periphery of the lubricated portion 120.
  • the microstructured zone 110 which may include the first microstructured zone 111, can extend over the entire remainder of the contact surface 100, that is to say the entire contact surface 100 outside the lubricated portion 120.
  • microstructured zone 110 including the first and second microstructured zones 111, 112 are also possible so that the microstructured zone 110 extends over a portion of the contact surface 100 or over the entire surface. contact area 100.
  • the cavities 20 of the texture formed of microcavities 20 can also serve as reservoirs for the lubricating substance.
  • the lubricating substance can then become trapped in the microcavities 20.
  • the microcavities 20 ensure the supply of lubricant to the contact surface 100.
  • microstructured zone 110 on the contact surface 100 are also possible so as to obtain arrangements of more or less oleophobic and / or oleophilic zones on the contact surface 100.
  • the different space combinations of the microstructured zone 110 can be combined with a film of a substance making it possible to modify the surface energy and / or an oxygen plasma treatment in order to modify the oleophobic and / or oleophilic character of the microstructured zone 110. It is thus possible to d 'optimizing the confinement of the lubricating substance near and / or in the lubricated portion 120 in order to guarantee a durable localization of the lubricant in this zone.
  • the fig. 10 schematically represents the component according to another embodiment, in which the contact surface 100 comprises two microstructured zones 110 in strip bounding the lubricated portion 120 between the two microstructured zones 110.
  • Such an arrangement can be advantageous in the case of a contact. linear (in the direction of the bands of the microstructured zone 110).
  • the microstructured zone 110 can be included on a watch component 10, in particular a watch component in sliding and pivoting, for example against another fixed or moving watch component.
  • the microstructured area 110 can be included on a pivot or bearing stone, an escape vane, a plate peg, a tooth, or other functional or decorative parts.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Micromachines (AREA)
  • Sliding-Contact Bearings (AREA)
  • Lubricants (AREA)
EP19184822.5A 2019-07-05 2019-07-05 Mikromechanische komponente, die die einschliessung einer schmiersubstanz erlaubt Active EP3761123B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP19184822.5A EP3761123B1 (de) 2019-07-05 2019-07-05 Mikromechanische komponente, die die einschliessung einer schmiersubstanz erlaubt
JP2021577901A JP7316391B2 (ja) 2019-07-05 2020-03-27 潤滑物質を含むマイクロメカニカル部品
US17/624,172 US20220357706A1 (en) 2019-07-05 2020-03-27 Micromechanical component for containing a lubricant substance
CN202080048923.8A CN114026504B (zh) 2019-07-05 2020-03-27 允许限制润滑物质的微机械部件
PCT/IB2020/052901 WO2021005423A1 (fr) 2019-07-05 2020-03-27 Composant de micromécanique permettant le confinement d'une substance lubrifiante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19184822.5A EP3761123B1 (de) 2019-07-05 2019-07-05 Mikromechanische komponente, die die einschliessung einer schmiersubstanz erlaubt

Publications (2)

Publication Number Publication Date
EP3761123A1 true EP3761123A1 (de) 2021-01-06
EP3761123B1 EP3761123B1 (de) 2024-10-23

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EP19184822.5A Active EP3761123B1 (de) 2019-07-05 2019-07-05 Mikromechanische komponente, die die einschliessung einer schmiersubstanz erlaubt

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US (1) US20220357706A1 (de)
EP (1) EP3761123B1 (de)
JP (1) JP7316391B2 (de)
CN (1) CN114026504B (de)
WO (1) WO2021005423A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014012039A1 (en) * 2012-07-13 2014-01-16 President And Fellows Of Harvard College Slippery liquid-infused porous surfaces having improved stability
EP3002637A1 (de) * 2014-09-29 2016-04-06 Richemont International S.A. Uhrensystem mit verbesserten tribologischen eigenschaften
EP3067757A1 (de) * 2015-03-13 2016-09-14 The Swatch Group Research and Development Ltd. Tribologischer mikrostrukturbehälter
EP3141520A1 (de) * 2015-09-08 2017-03-15 Nivarox-FAR S.A. Herstellungsverfahren für ein mikromechanisches uhrenbauteil und entsprechendes mikromechanisches uhrenbauteil
CH713426A2 (fr) 2017-02-10 2018-08-15 Seiko Instr Inc Composant mécanique, module de mécanisme, mouvement et pièce d'horlogerie.

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
CA2739903C (en) * 2008-10-07 2016-12-06 Ross Technology Corporation Highly durable superhydrophobic, oleophobic and anti-icing coatings and methods and compositions for their preparation
CN102226459B (zh) * 2011-06-03 2013-03-13 江苏大学 一种轴承的激光微造型自润滑处理方法
JP5787744B2 (ja) * 2011-12-22 2015-09-30 三菱電機株式会社 摺動機構およびロータリ圧縮機およびスクロール圧縮機
FR2990433A1 (fr) * 2012-05-10 2013-11-15 Surfactis Technologies Compositions catanioniques de recouvrement de surface par des molecules phosphoniques et amines
JP6004355B2 (ja) * 2015-01-23 2016-10-05 高知県公立大学法人 潤滑層の破断抑制方法および摺動部を有する構造体
EP3141522B1 (de) * 2015-09-08 2018-05-02 Nivarox-FAR S.A. Mikromechanisches uhrenbauteil, das eine geschmierte oberfläche umfasst, und herstellungsverfahren eines solchen mikromechanischen uhrenbauteils
CN105650443B (zh) * 2016-03-29 2018-08-14 武汉科技大学 一种基于流体动压润滑的表面结构及其应用

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014012039A1 (en) * 2012-07-13 2014-01-16 President And Fellows Of Harvard College Slippery liquid-infused porous surfaces having improved stability
EP3002637A1 (de) * 2014-09-29 2016-04-06 Richemont International S.A. Uhrensystem mit verbesserten tribologischen eigenschaften
EP3067757A1 (de) * 2015-03-13 2016-09-14 The Swatch Group Research and Development Ltd. Tribologischer mikrostrukturbehälter
EP3141520A1 (de) * 2015-09-08 2017-03-15 Nivarox-FAR S.A. Herstellungsverfahren für ein mikromechanisches uhrenbauteil und entsprechendes mikromechanisches uhrenbauteil
CH713426A2 (fr) 2017-02-10 2018-08-15 Seiko Instr Inc Composant mécanique, module de mécanisme, mouvement et pièce d'horlogerie.

Also Published As

Publication number Publication date
CN114026504A (zh) 2022-02-08
JP2022538344A (ja) 2022-09-01
CN114026504B (zh) 2022-11-11
WO2021005423A1 (fr) 2021-01-14
US20220357706A1 (en) 2022-11-10
JP7316391B2 (ja) 2023-07-27
EP3761123B1 (de) 2024-10-23

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