EP3982204A1 - Uhrresonator, der mindestens eine flexible führung umfasst - Google Patents

Uhrresonator, der mindestens eine flexible führung umfasst Download PDF

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Publication number
EP3982204A1
EP3982204A1 EP20200689.6A EP20200689A EP3982204A1 EP 3982204 A1 EP3982204 A1 EP 3982204A1 EP 20200689 A EP20200689 A EP 20200689A EP 3982204 A1 EP3982204 A1 EP 3982204A1
Authority
EP
European Patent Office
Prior art keywords
flexible
rib
flexible blade
resonator
plane
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
EP20200689.6A
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English (en)
French (fr)
Inventor
Baptiste Hinaux
Pascal Winkler
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.)
Swatch Group Research and Development SA
Original Assignee
Swatch Group Research and Development 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 Swatch Group Research and Development SA filed Critical Swatch Group Research and Development SA
Priority to EP20200689.6A priority Critical patent/EP3982204A1/de
Priority to US17/481,790 priority patent/US20220113677A1/en
Priority to JP2021162510A priority patent/JP7206346B2/ja
Priority to CN202111170325.0A priority patent/CN114296333A/zh
Publication of EP3982204A1 publication Critical patent/EP3982204A1/de
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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/045—Oscillators acting by spring tension with oscillating blade springs
    • 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • 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
    • 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

Definitions

  • the invention relates to a clockwork resonator comprising at least one inertial element mobile relative to a fixed structure, and suspended from a flexible guide comprising flexible blades crossed in projection on an XY plane at the level of a single crossing zone ZC , each deformable in a plane parallel to the XY plane each extending in a ribbon on either side of a neutral surface perpendicular to said XY plane and joining the first recess with said structure and the second recess with said inertial element.
  • the invention also relates to a timepiece, in particular a watch, comprising at least one such resonator.
  • the invention relates to the field of timepieces with mechanical oscillators, and in particular the field of watches, where the flexible guides according to the invention make it possible to guarantee both isochronism and insensitivity to positions in space. .
  • a mechanical watch has an oscillator with a balance-spring, which is responsible for the good chronometric precision of the watch.
  • a very promising way to overcome the friction of the pivots is that of oscillators with flexible guides, in which a flexible guide fulfills two elementary functions at the same time: on the one hand the guiding function and, on the other hand, the elastic restoring force or torque.
  • Non-limiting examples of rotating flexible guides are described in the documents EP3035126 , EP3206089 , and EP18179623 , all on behalf of THE SWATCH GROUP RESEARCH & DEVELOPMENT Ltd. There is now a wide variety of rotating flexible guides, the manufacture of which has been made possible by the “LIGA” and “DRIE” technologies.
  • a substantially flat plate is subjected to a moment, it deforms along an arc of a circle, and its end defines an angle proportional to the moment applied.
  • the flexed blade has a slight anticlastic curvature.
  • the anticlastic curvature is due to the fact that the fibers outside the neutral surface of the blade in bending must lengthen and therefore also contract in the directions orthogonal to the neutral surface, and, conversely, the fibers inside the surface. neutral are contracted and therefore extend orthogonally.
  • the magnitude of these orthogonal deformations is described by the Poisson's ratio. If the volume of the material is maintained, the Poisson's ratio is worth 0.5. For most common materials, the Poisson's ratio is closer to the value 0.3.
  • the magnitude of the anticlastic curvature depends on the local bending curvature, the Poisson's ratio of the material, the ratios between the three main dimensions of the blade, and the geometries of the embedments.
  • the document CH714 024 on behalf of THE SWATCH GROUP RESEARCH & DEVELOPMENT Ltd describes a resonator with crossed blades whose angle and crossing point are optimized in order to have a good isochronism, to be invariant in the positions and to obtain a large angular travel , up to about 30°. Nevertheless, it is found that for high aspect ratios of the blades, the anisochronism, i.e. the dependence of the rate on the amplitude, depends on the position in gravity, due to the inhibition variable of the anticlastic curvature along the blade. This limits the possible height of the blades, whereas a significant height is desirable in order to have good guidance.
  • the invention proposes to design a pivot with blades flexible in rotation making it possible to obtain a resonator with good isochronism in all positions, good guidance, a large angular travel, and simplified manufacture.
  • the invention proposes to define a flexible guide for a mechanical oscillator, which is subjected as little as possible to anticlastic curvature.
  • the invention proposes to provide the flexible blade with an adequate relief, in particular with ribs, in order to control the anticlastic curvature, without however significantly degrading the elastic performance of the flexible blade.
  • ribs are distributed along the flexible blade and extend according to the height thereof, in order to stiffen it to limit the anticlastic curvature, without greatly limiting its expected bending qualities.
  • the invention proposes the production of a pivot with flexible guidance micro-fabricated on two levels, of which at least one slat of one level crosses a slat of the other level.
  • These blades are ribbed to force inhibition of anticlastic curvature, and the ribs extend perpendicular to the blade from at least a first side of the blade (at a distance equal to at least the width of the blade).
  • the ribs are either absent or extend less than on the first side, so as to minimize the surface on which the two blades intersect in projection, and to facilitate their detachment.
  • the invention relates to a clockwork resonator according to claim 1.
  • the invention also relates to a timepiece, in particular a watch, comprising at least one such resonator.
  • the invention proposes to improve the control of the anticlastic curvature of the flexible blades that a flexible resonator guide comprises, by further improving the embodiments described by the document EP3667432 .
  • the invention relates to a clockwork resonator 100 comprising an inertial element 5 movable with respect to a fixed structure 4, and which is suspended from at least one flexible guide 10 comprising flexible blades 1, 2, crossed in projection on a XY plane at a single ZC crossing zone.
  • Each of these flexible strips 1, 2 is deformable in a plane parallel to the XY plane.
  • the tape constitutes the core of the flexible blade 1.2.
  • each flexible strip 1, 2 comprises at least one rib 3, which is asymmetrical with respect to its neutral surface SN1, SN2. And, at crossing zone ZC, either each flexible blade 1, 2 does not include any rib 3, or else each rib 3 is asymmetrical with respect to its neutral surface SN1, SN2.
  • the flexible guide 10 constitutes a means of elastic return of the inertial element 5.
  • This flexible guide 10 comprises at least two flexible blades 1, 2, deformable in planes P1, P2, parallel to each other and parallel to the plane of XY projection.
  • Each flexible blade 1, 2 has its largest dimension called length L between its recesses 41, 42; 51, 52.
  • Each flexible blade 1, 2 comprises at least two sections 6 of constant thickness equal to a nominal thickness EN, which are separated by at least one relief 11, 12, respectively 21, 22, forming a rib 3 s substantially extending a Z direction orthogonal to the XY projection plane to limit the anticlastic curvature of the flexible blade 1, 2.
  • each rib 3 is asymmetrical with respect to its neutral surface SN1, SN2.
  • each asymmetrical rib 3 comprises an external relief 11, 21, on the side opposite each other blade, the distal end of which is distant by an external distance DE1, DE2, from the neutral surface SN1, SN2, and, facing the exterior relief 11, 21, and on the side facing another blade, an interior relief 12, 22, the distal end of which is distant by an interior distance DI1, DI2, from the neutral surface SN1, SN2, which is lower at the outer distance DE1, DE2.
  • each flexible blade 1, 2 has, in a plane parallel to the projection plane XY, a second dimension E called thickness and which is less than the length L, and, in a direction Z orthogonal to the projection plane XY, a third dimension H called height and whose value is between those of the length L and the thickness E.
  • At least one relief 11, 12, 21, 22 projects from the flexible blade 1, 2, which carries it by a value which is greater than half of the smallest thickness of the flexible blade 1, 2 , or the nominal thickness EN, to limit the anticlastic curvature of this flexible blade 1, 2, and the flexible blade 1, 2 comprises, at a distance from its recesses, at least one rib 3 extending substantially in the direction Z.
  • each rib 3 is distant from any neck that the flexible blade 1, 2 has, by a value greater than or equal to the height H of the flexible blade 1, 2.
  • At least one flexible strip 1, 2 is symmetrical with respect to a median plane parallel to the XY plane.
  • each rib 3 comprises at least one generatrix 31 which is farther from its neutral surface SN1, SN2 than are the side surfaces of the sections 6 of the flexible blade 1, 2, located outside the ribs 3.
  • the longitudinal extension LN of each rib 3 of the flexible strip 1, 2, in a direction joining the recesses 41, 42, respectively 51, 52 of the flexible strip 1, 2, is less than or equal to one fifth of the length L of the flexible blade 1, 2, between its recesses 41, 42, respectively 51, 52.
  • At least one flexible blade 1, 2 comprises a plurality of such sections 6 extending along its neutral surface SN1, SN2, and in the geometric extension of each other along the neutral surface SN1, SN2 , with the same nominal thickness EN, each section 6 forming a strip whose side surfaces 60 are parallel to the direction Z. And, in projection on the XY plane, at least two sections 6 are separated by a rib 3 of projecting thickness ES with respect to a side surface 60, the projecting thickness ES being greater than or equal to the nominal thickness EN. More particularly still, this protruding thickness ES is at least one and a half times greater than the nominal thickness EN.
  • At least one flexible strip 1, 2 comprises, at a distance from the first recess 41, 42, and from the second recess 51, 52, at least two ribs 3.
  • At least one flexible blade 1, 2 is straight and has its neutral surface SN1, SN2, which is flat along a blade direction D joining the first recess 41, 42, and the second recess 51, 52.
  • At least one flexible strip 1, 2 comprises at least one rib 3 which extends over the entire height H of the flexible strip 1, 2, in the direction Z.
  • the height H of at least one flexible blade 1, 2 is less than or equal to one fifth of the length L of the flexible blade 1, 2, between its recesses 41, 42, respectively 51, 52.
  • the maximum transverse thickness EM of the flexible blade 1, 2 is less than or equal to one fifth of the height H of this flexible blade 1, 2.
  • the flexible strip 1, 2 forms a right prism along the direction Z.
  • prism is understood to mean a volume resulting from the translation of a base surface, in a rectilinear or curvilinear direction, a right prism resulting from the translation in a rectilinear direction.
  • the base of this prism in the XY plane is symmetrical with respect to the projection of the neutral surface SN1, SN2, in the XY plane.
  • each rib 3 of at least one flexible blade 1, 2 is less than or equal to the transverse protruding thickness ES of the rib 3.
  • At least one rib 3 is a rectangular parallelepiped.
  • At least one rib 3 is symmetrical with respect to the neutral surface SN1, SN2.
  • At least one flexible blade 1, 2 comprises, at a distance from the first recess 41, 42, and from the second recess 51, 52, a plurality of ribs 3 projecting alternately on either side of the sections 6.
  • any projection of at least one flexible blade 1, 2, in its rest position, on the XY plane includes its neutral surface SN1, SN2.
  • At least one flexible blade 1, 2 comprises, at a distance from the first recess 41, 42, and the second recess 51, 52, a plurality of ribs 3 distributed regularly in a longitudinal direction joining the recesses 41, 42, and 51 , 52.
  • At least one flexible blade 1, 2 comprises, at a distance from the first recess 41, 42, and from the second recess 51, 52, a plurality of ribs 3, the number of which is greater than or equal to the difference between on the one hand the quotient L/H between the length L and the height H, and on the other hand a unit.
  • the projection of at least one flexible blade 1, 2 on the XY plane comprises, at all the surface junctions, rounded fillets with a minimum radius value of 10 micrometers.
  • each of the flexible strips 1, 2 comprises either ribs on a single side of the strip of strip, or all the ribs which have the same transverse projection on the same side of the blade tape. These configurations are the most advantageous.
  • the invention essentially relates to the particular arrangement of the flexible blades at their crossing zone in projection ZC, to facilitate the production of the corresponding flexible guides 10. Therefore, the invention remains applicable to variants not illustrated, where the flexible blades 1, 2 comprise other arrangements of ribs: for example blades with ribs sometimes extending from one side and sometimes from the on the other side of the blade (for example towards the outside before the crossing and on the other side after), or even alternating ribs, or the like.
  • At least one flexible strip 1, 2 is made of micro-machinable material or of silicon thermally compensated by a peripheral layer of silicon dioxide.
  • At least one flexible blade 1, 2 is produced by the “DRIE” or “LIGA” or similar process.
  • the invention also relates to a timepiece 1000 comprising at least one such timepiece resonator 100. More particularly, this timepiece 100 is a watch, in particular a mechanical watch.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Micromachines (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
EP20200689.6A 2020-10-08 2020-10-08 Uhrresonator, der mindestens eine flexible führung umfasst Pending EP3982204A1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP20200689.6A EP3982204A1 (de) 2020-10-08 2020-10-08 Uhrresonator, der mindestens eine flexible führung umfasst
US17/481,790 US20220113677A1 (en) 2020-10-08 2021-09-22 Timepiece resonator including at least one flexible guide
JP2021162510A JP7206346B2 (ja) 2020-10-08 2021-10-01 少なくとも１つの可撓性ガイドを含む計時器共振子
CN202111170325.0A CN114296333A (zh) 2020-10-08 2021-10-08 包括至少一个柔性引导件的钟表谐振器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20200689.6A EP3982204A1 (de) 2020-10-08 2020-10-08 Uhrresonator, der mindestens eine flexible führung umfasst

Publications (1)

Publication Number Publication Date
EP3982204A1 true EP3982204A1 (de) 2022-04-13

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EP20200689.6A Pending EP3982204A1 (de) 2020-10-08 2020-10-08 Uhrresonator, der mindestens eine flexible führung umfasst

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US (1) US20220113677A1 (de)
EP (1) EP3982204A1 (de)
JP (1) JP7206346B2 (de)
CN (1) CN114296333A (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3035126A1 (de) 2014-12-18 2016-06-22 The Swatch Group Research and Development Ltd. Resonator einer Uhr mit sich kreuzenden Blättern
EP3206089A1 (de) 2016-02-10 2017-08-16 The Swatch Group Research and Development Ltd. Resonatormechanismus eines uhrwerks
CH714031A2 (fr) 2017-07-28 2019-01-31 Swatch Group Res & Dev Ltd Oscillateur d'horlogerie à guidages flexibles à grande course angulaire.
CH714024A2 (fr) 2017-07-28 2019-01-31 Swatch Group Res & Dev Ltd Oscillateur d'horlogerie à guidages flexibles à grande course angulaire.
CH715641A2 (fr) * 2018-12-13 2020-06-15 Eta Sa Mft Horlogere Suisse Résonateur d'horlogerie comportant au moins un guidage flexible.
EP3667432A1 (de) 2018-12-13 2020-06-17 ETA SA Manufacture Horlogère Suisse Uhrresonator, der mindestens eine flexible führung umfasst

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH710692B1 (fr) * 2015-02-03 2021-09-15 Eta Sa Mft Horlogere Suisse Mécanisme oscillateur d'horlogerie.
EP3312683B1 (de) * 2016-10-18 2019-02-20 ETA SA Manufacture Horlogère Suisse Mechanisches uhrwerk mit resonator mit zwei freiheitsgraden und wartungsmechanismus über eine auf einer laufpiste rollenden laufrolle
CH713150A2 (fr) * 2016-11-23 2018-05-31 Eta Sa Mft Horlogere Suisse Mécanisme régulateur à résonateur rotatif à guidage flexible entretenu par un échappement libre à ancre.
EP3561606B1 (de) * 2018-04-27 2022-01-26 The Swatch Group Research and Development Ltd Stossdämpfungsschutz eines resonators mit rcc-schwenkfedern
US10895845B2 (en) * 2018-06-25 2021-01-19 The Swatch Group Research And Development Ltd Timepiece oscillator with flexure bearings having a long angular stroke
WO2020016131A1 (en) * 2018-07-16 2020-01-23 Patek Philippe Sa Geneve Flexure pivot oscillator insensitive to gravity
US11409245B2 (en) * 2018-11-08 2022-08-09 Eta Sa Manufacture Horlogere Suisse Anti shock protection for a resonator mechanism with a rotary flexure bearing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3035126A1 (de) 2014-12-18 2016-06-22 The Swatch Group Research and Development Ltd. Resonator einer Uhr mit sich kreuzenden Blättern
EP3206089A1 (de) 2016-02-10 2017-08-16 The Swatch Group Research and Development Ltd. Resonatormechanismus eines uhrwerks
CH714031A2 (fr) 2017-07-28 2019-01-31 Swatch Group Res & Dev Ltd Oscillateur d'horlogerie à guidages flexibles à grande course angulaire.
CH714024A2 (fr) 2017-07-28 2019-01-31 Swatch Group Res & Dev Ltd Oscillateur d'horlogerie à guidages flexibles à grande course angulaire.
CH715641A2 (fr) * 2018-12-13 2020-06-15 Eta Sa Mft Horlogere Suisse Résonateur d'horlogerie comportant au moins un guidage flexible.
EP3667432A1 (de) 2018-12-13 2020-06-17 ETA SA Manufacture Horlogère Suisse Uhrresonator, der mindestens eine flexible führung umfasst

Also Published As

Publication number Publication date
CN114296333A (zh) 2022-04-08
JP7206346B2 (ja) 2023-01-17
JP2022062681A (ja) 2022-04-20
US20220113677A1 (en) 2022-04-14

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