EP2466396A1 - Blindage magnétique pour spiral de pièce d'horlogerie - Google Patents

Blindage magnétique pour spiral de pièce d'horlogerie Download PDF

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Publication number
EP2466396A1
EP2466396A1 EP10195192A EP10195192A EP2466396A1 EP 2466396 A1 EP2466396 A1 EP 2466396A1 EP 10195192 A EP10195192 A EP 10195192A EP 10195192 A EP10195192 A EP 10195192A EP 2466396 A1 EP2466396 A1 EP 2466396A1
Authority
EP
European Patent Office
Prior art keywords
arms
spiral
rocker
magnetic
hairspring
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.)
Withdrawn
Application number
EP10195192A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-François DIONNE
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 EP10195192A priority Critical patent/EP2466396A1/fr
Priority to US13/993,645 priority patent/US9494921B2/en
Priority to EP11793747.4A priority patent/EP2652560B1/fr
Priority to RU2013132473/28A priority patent/RU2545488C2/ru
Priority to CN201180060137.0A priority patent/CN103261976B/zh
Priority to JP2013543637A priority patent/JP5815043B2/ja
Priority to PCT/EP2011/071753 priority patent/WO2012080021A1/fr
Publication of EP2466396A1 publication Critical patent/EP2466396A1/fr
Priority to HK14101518.5A priority patent/HK1188488A1/zh
Withdrawn legal-status Critical Current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
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields
    • 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
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/063—Balance construction
    • 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
    • G04B17/20—Compensation of mechanisms for stabilising frequency
    • 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
    • G04B17/20—Compensation of mechanisms for stabilising frequency
    • G04B17/22—Compensation of mechanisms for stabilising frequency for the effect of variations of temperature
    • 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
    • G04B17/20—Compensation of mechanisms for stabilising frequency
    • G04B17/22—Compensation of mechanisms for stabilising frequency for the effect of variations of temperature
    • G04B17/222—Compensation of mechanisms for stabilising frequency for the effect of variations of temperature with balances
    • 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
    • G04B17/20—Compensation of mechanisms for stabilising frequency
    • G04B17/22—Compensation of mechanisms for stabilising frequency for the effect of variations of temperature
    • G04B17/227—Compensation of mechanisms for stabilising frequency for the effect of variations of temperature composition and manufacture of the material used
    • 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
    • G04B43/00—Protecting clockworks by shields or other means against external influences, e.g. magnetic fields
    • G04B43/002—Component shock protection arrangements

Definitions

  • the present invention relates to a protection device of a timepiece hairspring against disruptive magnetic fields coming from outside this timepiece.
  • the material constituting the hairspring is generally made of a metal alloy such as a steel capable of remanent magnetization if it is subjected to an external magnetic field.
  • a metal alloy such as a steel capable of remanent magnetization if it is subjected to an external magnetic field.
  • the simplest and most radical solution is to completely shield the movement of the timepiece to allow no disturbing line of fields to penetrate.
  • This is the case proposed by the document CH 122391 where the movement of the watch is protected by a set of elements formed of a stainless alloy, high permeability and low hysteresis, forming a magnetic screen.
  • the elements are a bowl disposed between the movement and the bottom of the watch, a dust cover ring forming a cap disposed between the movement and a casing ring, and an intermediate plate disposed between the watch plate and its dial.
  • This way of doing things is extremely cumbersome and expensive. Indeed it requires three additional pieces that not only weigh down the watch but also increase its volume.
  • the device is constituted by a housing element having a sufficient permeance to magnetic fields, the housing element being completed by a casing ring of mild steel with which it forms a bowl enveloping the movement and forming a screen magnetic.
  • the housing element is formed by the bottom of the housing, this bottom being made of stainless and polishable alloy having a homogeneous ferritic structure.
  • the bottom and the casing ring being directly made of materials to high magnetic permeability.
  • no screen is disposed between the movement and the dial of the watch, the protective device being limited to a bowl without cover serving as housing the movement of the watch.
  • a first disadvantage of this latter solution is that the hairspring proper is not protected against a disturbing field whatever the orientation of this field prevailing in the plane of the hairspring. Indeed, as the hairspring is off-center with respect to the center of the movement and if omnidirectional protection is desired, it is a question of proposing a device centered with respect to said hairspring and not with respect to the movement as a whole as it is the case of the document cited above.
  • Another disadvantage of this solution is to completely mask the movement, which is detrimental from an aesthetic point of view, especially for high-end watches.
  • the protection device comprises a rocker made of a ferromagnetic material.
  • An advantage of the solution is to achieve magnetic shielding, advantageously using certain elements of the movement as a shielding element, and thus preferably do not require the use of any additional parts. The size is thus reduced to the maximum.
  • Another advantage of the proposed solution is to allow the visualization of the movement elements by the bottom of the watch, thus improving the overall aesthetics of the timepiece produced.
  • the watchmaker faces a space problem to house the shield on the plate and in the housing. Therefore, it has been sought to find optimal solutions that combine minimal footprint and effective attenuation of the magnetic field.
  • the regulating member of a mechanical watch is generally constituted by a spiral spring, as illustrated in FIG. Figure 1A .
  • the hairspring is mounted about an axis of rotation Z and is wound in a plane perpendicular to this axis.
  • the diameter of the spiral in this plane is noted d
  • the height of the spiral along the Z axis is denoted h .
  • the Figure 1B shows a portion of this spiral 1 which is a very long ribbon wound on itself, this ribbon preferably having a reduced height h and a very small thickness e . It follows from this that if it is polarized in the direction of the Z or orthogonally height, or in the direction of the thickness R or radially, little or no remanent magnetization will remain.
  • a polarization in the direction of the length L is to be avoided because it is the only one, especially on the outer turns of the hairspring, to cause a residual magnetization of the latter producing, as we saw above, an additional couple parasite causing a random variation of the return moment of the spiral affecting the isochronism of the regulating system.
  • it is therefore sufficient to orient the field lines in a more or less orthogonal and radial configuration to the plane of the hairspring 1.
  • the pendulum 2 of which a preferred embodiment with four branches is represented in figure 2 , appears therefore as the most suitable element, because of the location of its arms 3 in a plane parallel to the plane of the spiral 1, and their symmetrical configuration with respect to the axis of rotation Z of the spiral 1.
  • the casing ring 4 makes it possible to effectively protect the hairspring 1 against the disturbing magnetic fields, because the latter are deflected in greater numbers in the vertical direction of the Z axis of rotation, which is a direction of polarization according to which the hairspring is less sensitive. It will be noted however that the concentration of the field at the periphery of the arms 3 and at the level of the circle 4 always tends to locally increase this field, hence the need to provide a casing ring 4 of diameter D which is relatively large compared with the diameter. d spiral 1, preferably at least twice so that no part of the spiral, even at the outermost level, can suffer this undesirable effect of concentration.
  • the high-saturation magnetic material used to make the casing ring 4 and the arms 3 may consist for example of iron-nickel alloy, iron-cobalt, iron-chromium, or iron-nickel-molybdenum alloys, iron -nickel-copper.
  • iron-nickel alloy iron-cobalt, iron-chromium, or iron-nickel-molybdenum alloys, iron -nickel-copper.
  • Some amorphous metal alloys, based on iron, are also possible; this type of alloy is recognized for its low coercivity properties and high magnetic permeability, that is to say with very narrow hysteresis cycles, and with a very high slope, are also very resistant to corrosion and thus particularly suitable for the implementation of the invention.
  • the chemical nature of the alloy is chosen so that the magnetic behavior of the material has a high magnetic permeability and saturation level; according to the preferred embodiment of the invention, it has for example been used a Pernenorm iron-nickel alloy with a nickel content of 45 to 50%.
  • the rocker 2 comprises at least four flattened arms which extend in the winding plane of the spiral.
  • the rocker arm is continuously rotated and a substantially planar surface is emulated to form a magnetic shield in this plane.
  • the attenuation is of the order of half between an external field and the field where the hairspring 1 is located, whose diameter d and height h preferably respect the ratios stated above with respect to those D, H of the casing circle 4.
  • the plurality of arms 3 covers an area equal to more than a quarter of the virtual disk delimited by the casing ring 4 in the arm rotation plane 3, an attenuation of the disturbances relative to the operating gaps which can reach ratios greater than 3, especially for induction values greater than 10 millitesla (mT), or about 8kA / m for a three-armed balance with the ratio of area evoked with respect to the virtual disk delimited by the casing circle.
  • the device according to the invention may comprise a second series of arms 3 surmounted on said casing ring 4, as illustrated in FIG. figure 3 .
  • the series of arms 3 ' may preferably be angularly offset or of a different or complementary but symmetrical geometrical shape.
  • the two sets of arms are identical to that of the lower arms 3, so that the two series of arms 3 and 3 'are superimposed.
  • the advantage of covering the magnetic shield on the top by rotating arms makes it possible on the one hand to constitute a symmetrical and totally closed space inside which the spiral 1 is arranged, which makes the shielding effective both in terms of attenuation and isotropy; on the other hand, similar to the attenuation values measured with the only arms 3 the mass efficiency of the shielding is greatly improved compared to a solid surface such as a disk.
  • the piece forming the balance with two sets of arms 3,3 ' may be formed integrally for example by a LIGA type process, or by interlocking a rib in a groove of parts of the male-female type each having a series of arms and each forming part of the casing ring 4.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Electric Clocks (AREA)
  • Springs (AREA)
  • Magnetic Treatment Devices (AREA)
EP10195192A 2010-12-15 2010-12-15 Blindage magnétique pour spiral de pièce d'horlogerie Withdrawn EP2466396A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP10195192A EP2466396A1 (fr) 2010-12-15 2010-12-15 Blindage magnétique pour spiral de pièce d'horlogerie
US13/993,645 US9494921B2 (en) 2010-12-15 2011-12-05 Magnetic shielding for timepiece balance spring
EP11793747.4A EP2652560B1 (fr) 2010-12-15 2011-12-05 Blindage magnetique pour spiral de piece d'horlogerie
RU2013132473/28A RU2545488C2 (ru) 2010-12-15 2011-12-05 Магнитный экран для балансирной пружины часов
CN201180060137.0A CN103261976B (zh) 2010-12-15 2011-12-05 用于时计游丝的磁屏蔽
JP2013543637A JP5815043B2 (ja) 2010-12-15 2011-12-05 時計のヒゲゼンマイのための磁気シールド
PCT/EP2011/071753 WO2012080021A1 (fr) 2010-12-15 2011-12-05 Blindage magnetique pour spiral de piece d'horlogerie
HK14101518.5A HK1188488A1 (zh) 2010-12-15 2014-02-18 用於時計游絲的磁屏蔽

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10195192A EP2466396A1 (fr) 2010-12-15 2010-12-15 Blindage magnétique pour spiral de pièce d'horlogerie

Publications (1)

Publication Number Publication Date
EP2466396A1 true EP2466396A1 (fr) 2012-06-20

Family

ID=44123366

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10195192A Withdrawn EP2466396A1 (fr) 2010-12-15 2010-12-15 Blindage magnétique pour spiral de pièce d'horlogerie
EP11793747.4A Active EP2652560B1 (fr) 2010-12-15 2011-12-05 Blindage magnetique pour spiral de piece d'horlogerie

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11793747.4A Active EP2652560B1 (fr) 2010-12-15 2011-12-05 Blindage magnetique pour spiral de piece d'horlogerie

Country Status (7)

Country Link
US (1) US9494921B2 (ru)
EP (2) EP2466396A1 (ru)
JP (1) JP5815043B2 (ru)
CN (1) CN103261976B (ru)
HK (1) HK1188488A1 (ru)
RU (1) RU2545488C2 (ru)
WO (1) WO2012080021A1 (ru)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3502786A1 (fr) 2017-12-22 2019-06-26 The Swatch Group Research and Development Ltd Balancier pour pièce d'horlogerie et procédé de fabrication d'un tel balancier

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US965506A (en) * 1908-10-22 1910-07-26 Frederic Ecaubert Compensating balance for timepieces.
CH122391A (fr) 1926-10-22 1927-09-16 Ditisheim Paul Montre.
CH289106A (fr) * 1949-06-20 1953-02-28 Dubois Ernest Spiral compensateur.
CH361247A (fr) * 1958-08-08 1962-03-31 Lip Societe Anonyme D Horloger Montre électrique
FR1408872A (fr) 1964-07-08 1965-08-20 Lip Sa Dispositif de protection des montres contre les champs magnétiques
FR2000706A1 (ru) * 1968-01-25 1969-09-12 Junghans Gmbh Geb
FR2063101A1 (ru) * 1969-09-15 1971-07-09 Lip Horlogerie
CH692218A5 (de) * 1996-12-11 2002-03-15 Lothar Schmidt Unruh.
EP2230570A2 (fr) * 2009-03-19 2010-09-22 MHVJ Manufacture Horlogère Vallée de Joux Composant d'une pièce d'horlogerie allégé et renforcé

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002138A (en) * 1958-06-24 1961-09-26 Gen Time Corp Electrically powered oscillatory balance
US3335561A (en) * 1964-05-18 1967-08-15 Seiko Instr & Electronics Contactless battery timepiece
US3943701A (en) * 1975-01-08 1976-03-16 Timex Corporation Regulator and balance bridge arrangement for a horological device
JPH04124246A (ja) * 1990-09-13 1992-04-24 Alps Electric Co Ltd 時計の文字盤
CH689106A5 (de) 1994-09-15 1998-10-15 Erich M Durrer Befestigungsvorrichtung fuer Schmuck.
DE19651320B4 (de) * 1996-12-11 2004-06-03 Schmidt, Lothar Schwingsystem
WO2001065318A1 (fr) * 2000-02-29 2001-09-07 Seiko Instruments Inc. Piece d'horlogerie mecanique a element de detection optique et element de freinage
JP2003043166A (ja) * 2001-07-30 2003-02-13 Seiko Epson Corp 時 計
ATE363676T1 (de) * 2003-10-01 2007-06-15 Asulab Sa Uhr mit einem mechanischen uhrwerk, das mit einem elektronischen regulator gekoppelt ist
JP4595901B2 (ja) * 2006-07-27 2010-12-08 カシオ計算機株式会社 機器ケース、腕時計ケースおよび電波時計
JP2010513886A (ja) * 2006-12-21 2010-04-30 コンプリタイム エスアー 時計用メカニカル振動子
EP2104005A1 (fr) * 2008-03-20 2009-09-23 Nivarox-FAR S.A. Balancier composite et son procédé de fabrication
EP2287683B1 (fr) * 2009-08-17 2012-10-31 The Swatch Group Research and Development Ltd. Protection magnétique d'un spiral de pièce d'horlogerie
EP2410387B1 (fr) * 2010-07-19 2016-07-06 Nivarox-FAR S.A. Balancier à réglage d'inertie sans insert
EP2596406B1 (fr) * 2010-07-19 2019-03-27 Nivarox-FAR S.A. Mecanisme oscillant a pivot elastique et mobile de transmission d'energie

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US965506A (en) * 1908-10-22 1910-07-26 Frederic Ecaubert Compensating balance for timepieces.
CH122391A (fr) 1926-10-22 1927-09-16 Ditisheim Paul Montre.
CH289106A (fr) * 1949-06-20 1953-02-28 Dubois Ernest Spiral compensateur.
CH361247A (fr) * 1958-08-08 1962-03-31 Lip Societe Anonyme D Horloger Montre électrique
FR1408872A (fr) 1964-07-08 1965-08-20 Lip Sa Dispositif de protection des montres contre les champs magnétiques
FR2000706A1 (ru) * 1968-01-25 1969-09-12 Junghans Gmbh Geb
FR2063101A1 (ru) * 1969-09-15 1971-07-09 Lip Horlogerie
CH692218A5 (de) * 1996-12-11 2002-03-15 Lothar Schmidt Unruh.
EP2230570A2 (fr) * 2009-03-19 2010-09-22 MHVJ Manufacture Horlogère Vallée de Joux Composant d'une pièce d'horlogerie allégé et renforcé

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3502786A1 (fr) 2017-12-22 2019-06-26 The Swatch Group Research and Development Ltd Balancier pour pièce d'horlogerie et procédé de fabrication d'un tel balancier
WO2019120959A1 (fr) 2017-12-22 2019-06-27 The Swatch Group Research And Development Ltd Balancier pour piece d'horlogerie et procede de fabrication d'un tel balancier

Also Published As

Publication number Publication date
JP5815043B2 (ja) 2015-11-17
US20130265859A1 (en) 2013-10-10
HK1188488A1 (zh) 2014-05-02
EP2652560B1 (fr) 2019-11-13
RU2545488C2 (ru) 2015-04-10
JP2014508918A (ja) 2014-04-10
EP2652560A1 (fr) 2013-10-23
US9494921B2 (en) 2016-11-15
RU2013132473A (ru) 2015-01-20
WO2012080021A1 (fr) 2012-06-21
CN103261976A (zh) 2013-08-21
CN103261976B (zh) 2016-05-11

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