EP2466396A1 - Blindage magnétique pour spiral de pièce d'horlogerie - Google Patents
Blindage magnétique pour spiral de pièce d'horlogerie Download PDFInfo
- 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- Withdrawn
Links
Images
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.
Landscapes
- 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)
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 |
PCT/EP2011/071753 WO2012080021A1 (fr) | 2010-12-15 | 2011-12-05 | Blindage magnetique pour spiral de piece d'horlogerie |
US13/993,645 US9494921B2 (en) | 2010-12-15 | 2011-12-05 | Magnetic shielding for timepiece balance spring |
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 |
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 |
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)
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)
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)
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 |
EP2102717B1 (fr) * | 2006-12-21 | 2013-06-26 | CompliTime S.A. | Oscillateur mecanique pour une piece d'horlogerie |
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 |
JP5551312B2 (ja) * | 2010-07-19 | 2014-07-16 | ニヴァロックス−ファー ソシエテ アノニム | 弾性ピボット及びエネルギ伝達のための可動要素を有する発振機構 |
-
2010
- 2010-12-15 EP EP10195192A patent/EP2466396A1/fr not_active Withdrawn
-
2011
- 2011-12-05 RU RU2013132473/28A patent/RU2545488C2/ru not_active IP Right Cessation
- 2011-12-05 WO PCT/EP2011/071753 patent/WO2012080021A1/fr active Application Filing
- 2011-12-05 JP JP2013543637A patent/JP5815043B2/ja active Active
- 2011-12-05 CN CN201180060137.0A patent/CN103261976B/zh active Active
- 2011-12-05 EP EP11793747.4A patent/EP2652560B1/fr active Active
- 2011-12-05 US US13/993,645 patent/US9494921B2/en active Active
-
2014
- 2014-02-18 HK HK14101518.5A patent/HK1188488A1/zh unknown
Patent Citations (9)
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)
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 |
---|---|
US9494921B2 (en) | 2016-11-15 |
EP2652560A1 (fr) | 2013-10-23 |
JP5815043B2 (ja) | 2015-11-17 |
CN103261976A (zh) | 2013-08-21 |
HK1188488A1 (zh) | 2014-05-02 |
WO2012080021A1 (fr) | 2012-06-21 |
EP2652560B1 (fr) | 2019-11-13 |
US20130265859A1 (en) | 2013-10-10 |
JP2014508918A (ja) | 2014-04-10 |
RU2545488C2 (ru) | 2015-04-10 |
CN103261976B (zh) | 2016-05-11 |
RU2013132473A (ru) | 2015-01-20 |
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