CN101589347A - Mechanical oscillator for timepiece - Google Patents
Mechanical oscillator for timepiece Download PDFInfo
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- CN101589347A CN101589347A CNA2007800470503A CN200780047050A CN101589347A CN 101589347 A CN101589347 A CN 101589347A CN A2007800470503 A CNA2007800470503 A CN A2007800470503A CN 200780047050 A CN200780047050 A CN 200780047050A CN 101589347 A CN101589347 A CN 101589347A
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- balance wheel
- counterweight
- mechnical oscillator
- hairspring
- former
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Abstract
Mechanical oscillator for timepiece having a balance (10) and a hairspring (12). The balance (10) and the hairspring (12) are made of the same material. This material is non-magnetic and possesses a very low thermal expansion coefficient.
Description
Technical field
The present invention relates to be used for the mechnical oscillator of clock and watch, relate more specifically to have the highly mechnical oscillator of the watch of tautochronism.
Background technology
At watch different mechnical oscillators is proposed.Generally speaking, these oscillators are designed to produce the hairspring-balance wheel form of the vibration that limits oscillator free run frequency setting.This natural frequency will be divided into the identical unit of a plurality of strictnesses the time so that the ratchet-wheel gear of watch is regulated the speed of its gear train.Thus, the degree of accuracy of watch depends on the frequency stability of its hairspring-balance wheel.
For example the several parameters of temperature, changes of magnetic field and the variation of balance wheel oscillation amplitude influences the frequency stability of hairspring-balance wheel.Temperature variation can cause the thermal expansion of balance wheel and hairspring, and this causes that in essence the moment of inertia of balance wheel changes and the reseting torque of hairspring changes.Magnetic field acts on hairspring in essence and can disturb even offset its effect to balance wheel.The oscillation amplitude of balance wheel changes weight and inertia that is associated with balance wheel and the tautochronism defective that can cause hairspring-balance wheel.Therefore, all these parameters can both change the natural frequency of hairspring-balance wheel.
For compensates, the material of selecting to be used for to make the balance wheel of mechnical oscillator of the most frequent use and hairspring is so that the moment of inertia of balance wheel changes and the variation of hairspring reseting torque compensates one another.As suggested design, must notice especially that the beallon balance wheel is used the hairspring that for example specially designed alloy manufacturing of invar (invar) and elinvar (elinvar) forms, invar and elinvar are the Rhometals with low-down expansion coefficient.Yet this class hairspring-balance wheel is still to magnetic-field-sensitive.Therefore, still to continue to seek the new alloy that can be used for making hairspring, for example Silinvar
TMResearch and development manifested.The self compensation result of these alloys at first is the result of two kinds of adverse effects, especially temperature action and and the magnetostrictive effect of metallic elastic modulus.
For the compensating field effect, except using, also propose to make hairspring with for example quartzy nonmagnetic substance at the custom-designed new alloy of this purpose, make balance wheel with beryllium copper as described above simultaneously.Yet this class hairspring-balance wheel is to the temperature variation sensitivity.
For the variation of the oscillation amplitude of compensation balance wheel so that its tautochronism defective reduces to minimum, some factor must be taken into account, the contraction, hairspring elastic response that comprise the unevenness of expansion and hairspring are in the variation of temperature and changes of magnetic field, mounting points, centrifugal force and the gravity of hairspring, trim, friction and the geometric configuration of balance wheel.Minimizing the tautochronism defective is the key of optimizing the accuracy of stem-winder.This is to make the hairspring-balance wheel with height tautochronism that allows its generation to be independent of the equal vibration of its amplitude.Therefore, often use as far as possible gently and have the balance wheel of big as far as possible inertia.
WO2004/008529A1 shows an example of the hairspring-balance wheel that is designed to correct the problems referred to above.This hairspring-balance wheel is provided with balance wheel, and balance wheel comprises that thermal expansivity is for just and less than+1 * 10
-6K
-1Nonmagnetic ceramic.This hairspring is entwined by material or is made with respect to the continuous carbon fibre composition of fiber axially parallel.These fibers are embedded in thermosetting, thermoplastic or ceramics polymer matrix.The thermal expansivity of this composition is for negative and greater than-1 * 10
-6K
-1More specifically, select to be used to make the material of balance wheel and hairspring so that their Coefficient of Thermal Expansion value is identical, very low and have an opposite symbol.Thus, this hairspring-balance wheel is realized the high-caliber accuracy of oscillator and more stable function as the result of the self compensation effect of hairspring.
Summary of the invention
The objective of the invention is to reduce at least significantly the self compensation effect of hairspring.Therefore, the present invention proposes a kind of hairspring-balance wheel, and its heatproof degree in very wide temperature range changes to avoid the change of inertia moment of thermal expansion and balance wheel.More generally, the objective of the invention is to propose a kind of with regard to it to having the hairspring-balance wheel of the frequency stability that has improved with regard to the sensitivity of temperature and amplitude and changes of magnetic field.
The mechnical oscillator that the objective of the invention is to constitute by balance wheel and hairspring by the feature with independent claims is realized.The change example of preferred embodiment is the theme of dependent claims.
More specifically, this purpose realizes that by mechnical oscillator according to the present invention it is characterized in that, balance wheel and hairspring are manufactured from the same material.Balance wheel and hairspring are manufactured from the same material can avoid the compensating effect of hairspring with respect to balance wheel, and therefore it have almost constant inertia.Therefore, the self compensation between balance wheel and the hairspring becomes and can ignore.
Description of drawings
Embodiment details according to hairspring-balance wheel of the present invention will be from hereinafter becoming obviously the detailed description to embodiment, and described embodiment provides by way of example and illustrated by accompanying drawing, in the accompanying drawings:
Fig. 1 is the amplification plan view according to mechnical oscillator of the present invention;
Fig. 2 is the cross-sectional view of the amplification of the mechnical oscillator among Fig. 1;
Fig. 3 is the figure that the rate of chronometer variation of two kinds of different mechnical oscillators is shown.
Embodiment
In the detailed description of the accompanying drawings, same parts is represented by same reference numerals below.Usually, for simplicity to avoid repetition, only to the functional description of these parts and they time.
Fig. 1 and Fig. 2 illustrate the hairspring balanced type mechnical oscillator that is made of balance wheel 10 and hairspring 12 by example.Balance wheel 10 is installed in former 16 on the axle 14 and first kind counterweight 18 and the second type counterweight 19, chuck 20 and roller 22 by axle 14, rigidity and constitutes.Hairspring 12 is by making with the identical or different material of the former 16 that is used for making balance wheel 10.
According to preferred embodiment of the present invention, hairspring 12 is by making with balance wheel 10 identical materials.More specifically, the former 16 of hairspring 12 and balance wheel 10 is manufactured from the same material.Balance wheel 10 and/or its former 16 and hairspring 12 are manufactured from the same material can avoid the compensating effect of hairspring 12 with respect to balance wheel 10, and it has almost constant inertia thus.Therefore, the self compensation between balance wheel 10 and the hairspring 12 almost is insignificant.
The material that is selected to make balance wheel 10 and/or its former 16 and hairspring 12 is preferably for nonmagnetic and have at the most 20 to 2 * 10
-10The advantage of-ppm/ ℃ thermal expansivity.This thermal expansivity is preferably 5 * 10
-6Ppm/ ℃, more preferably be at the most 2 * 10
-6Ppm/ ℃.The apparent density of material is preferably at 2.0-5.0g/cm
3Scope in, preferably be 2.5-4.5g/cm
3, more preferably be 3-4.0g/cm
3
According to preferred embodiment of the present invention, this material is adamas or diamond synthesis, more generally is based on adamantine material.Yet, also can be as hereinafter using other material in greater detail, for example quartz, silicon, carbon, titanium or pottery.
As shown in Figure 1, the axle 14 of balance wheel 10 has the axis of symmetry that is called as the AA axle, and this also is its rotation.Axle 14 is made by hardened steel traditionally and is comprised bearing 14a, is arranged on the bearing 14a either side and is intended to hold respectively columnar portion 14b, 14c and the 14d of chuck 20, former 16 and roller 22.Its end forms pivot 14e and the 14f that is intended to fit in the supporting that is formed in the unshowned clock and watch frame.
Former 16 comprises medium pore 16a and defines the opening of eight radial locations of eight arm 16b.The outer end of arm 16b is connected to each other together to form wheel rim 16c.The latter is pierced through at the extension place of arm 16b with formation parallel to the axis the AA location and the hole 16d of fixed weight 18,19 therein.The bottom of wheel rim 16c can be made by the material different with former 16.In this case, if former 16 is made by for example adamas, then diamond coatings can be coated on wheel rim 16c so that wheel rim 16c obtains the physical characteristics identical with former 16.
More specifically, according to a preferred embodiment of the present invention, balance wheel 10 and/or hairspring 12 are coated with nanoparticle material, and this material is preferably nonmagnetic and has at the most 20 to 2 * 10
-10The advantage of ppm/ ℃ thermal expansivity.This thermal expansivity is preferably 5 * 10
-6Ppm/ ℃, more preferably be at the most 2 * 10
-6Ppm/ ℃.The apparent density of described material is preferable at 2.0-5.0g/cm
3Scope in, preferably be 2.5-4.5g/cm
3, more preferably be 3-4.0g/cm
3Preferably, balance wheel 10 and hairspring 12 have nano diamond coating.This coating also can preferably put on the known hairspring-balance wheel of those skilled in that art, for example comprises the balance wheel of being made by beallon, and this balance wheel is connected in the hairspring that uses for example specially designed alloy manufacturing of invar to form.
As can be from more specifically finding out Fig. 2, former 16 leans against that bearing 14a goes up and by columnar portion 14c location.It is fixed in axle 14 by the bounding point 24 that is arranged in the made shell of hole 16a periphery.Chuck 20 is pressed on the columnar portion 14d of axle 14, relies on former 16.It will maintain by attached hairspring 12 by bonding agent.
Former 16 is formed by the material piece with low-density and low thermal coefficient of expansion of for example adamas, corundum, quartz or silicon, and has the thickness of 1/tens millimeter magnitudes.More specifically, this thickness and typically has the value of 0.2mm preferably in the scope of 0.05mm to 0.3mm.As mentioned above, hairspring 12 is made by the material identical or inequality with being used for making balance wheel 10 and/or its former 16.Therefore, the material that is used for making hairspring 12 also can be chosen from the top material of listing by way of example, i.e. adamas, quartz, silicon or corundum.The elasticity and the length of these materials are very little with variation of temperature.
Each freely is shaped as counterweight 18 the columniform nail 18a with the axis of symmetry that is expressed as axis BB in Fig. 1 and forms, and form from the density of for example gold or the platinum heavy material greater than 15g/cm3, counterweight 18 is provided with head 18b, body 18c and the ring 18d that is manufactured from the same material.The body 18c of each counterweight 18 cooperates hand-hole 16d, and head 18b leans against on the former 16.Relevant ring 18d is fixed on the opposite side of former 16 by extruding, gummed or soldering.
As mentioned above, be used for making and have very little temperature sensitivity according to the balance wheel 10 of mechnical oscillator of the present invention and the material of hairspring 12.In addition, this material can meet the tolerance limit of being set up by the chronoscope standard of Switzerland's watchmaking, and it is illustrated in the table 1 given below.
Table 1: the chronoscope standard of Switzerland's watchmaking
Satisfying the non-limiting example that standard shown in the table 1 therefore can be used in material of the present invention is adamas, titanium, pottery and quartzy, as top more elaborate.These materials have following physical features.Apparent density:
-adamas: 3.515g/cm
3
-5 grade titanium: 4.42g/cm
3
-ceramic AI
2O
3: 3.9g/cm
3
-quartz: 2.6g/cm
3
Thermal expansivity:
-adamas: 110
-6Ppm/C °
-5 grade titaniums: 910
-6Ppm/C °
-ceramic AI
2O
3: 810
-6Ppm/C °
-quartz: 0.510
-6Ppm/C °
Be used for making the nonmagnetic substance of balance wheel 10 and/or its former 16 and hairspring 12 by special selection, can obtain low thermal coefficient of expansion and best matter-footpath than.More specifically, made by the material highly stable with respect to temperature owing to comprise the mechnical oscillator of balance wheel 10 and hairspring 12 among Fig. 1 and 2, its frequency is highly stable and very little with variation of temperature.Frequency stability is because the axis of counterweight 18 relative equilibriums wheel 10 has fixing center of gravity and increases.This allows the height tautochronism of the preferred embodiment acquisition mechnical oscillator according to the present invention, as shown in Figure 3.
Fig. 3 illustrates the curve map of the rate of chronometer variation of two kinds of different mechnical oscillators by way of example.These rates of chronometer change on axle 41 to represent that this depends on the residing different temperatures of corresponding mechnical oscillator of being tested second ([S]).These temperature on axle 31 with degree centigrade ([℃]) expression.
The rate of chronometer that first curve 30 illustrates the clock that comprises the standard mechanical oscillator changes.As shown in Figure 3, when+8 and+during temperature range build-in test clock between 38 ℃, rate of chronometer change as fast 6 seconds of point 32 indications and put between slow 4 seconds of 34 indications.
The rate of chronometer that second curve 40 illustrates this clock when clock is made the mechnical oscillator of with good grounds preferred embodiment of the present invention changes.As shown in Figure 3, in this example+8 and+during temperature range build-in test clock between 38 ℃, rate of chronometer change as point 42 indications can not walk fast and as putting 44 indications between slow about 1.3 seconds.
Yet must be pointed out, to also have other advantage by selecting employed material to obtain except frequency stability with respect to temperature according to mechnical oscillator of the present invention.For example, because the material that is made of balance wheel 10 and hairspring 12 is non magnetic, so magnetic field can not interact with them.Only in the structure of the axle 14 that above-described use is made by hardened steel, magnetic field energy and this axle 14 interact, yet this interactional influence is zero in practice.
At last, owing to the proportion of the material of making former 16 is low, although make the proportion height of the material of counterweight 18,19, the gross mass of balance wheel 10 is low for given moment of inertia.Consequently the tautochronism defective is further reduced.
The counterweight 18,19 of gold or platinum system allows counterweight 10 to be manufactured with particularly good moment of inertia/mass ratio.Also may use the material of lower cost, for example brass or invar.Under one situation of back, can further reduce the expansion of counterweight 18,19.
Generally speaking, the balance wheel of clock and watch must be by trim.This can finish by removal or interpolation material.This operation particularly advantageously realizes that by acting on counterweight 18 described counterweight has symmetrical structure with respect to its axis BB.In addition, the described counterweight 18 of at least a portion preferably has the cylindrical of zone axis BB in it is engaged in part in the former 16.In order to prevent that its symmetry is affected, perhaps mechanically or by applying laser instrument thereon remove material, to guarantee removing material symmetrically equably or with respect to axis BB along whole surface.Also can be by splash on or other counterweight 18 to add material, this remains guarantees to keep symmetry with respect to axis BB.Therefore; the present invention is also claimed by removing material from balance wheel 10 or adding material to carry out the trim method at balance wheel 10; it is characterized in that, at least one described counterweight, remove material symmetrically or obtain balance by symmetrically material being added at least one counterweight 18 with respect to its cylinder axis with respect to the axis of cylinder.
At last, the material that is used for making counterweight 18 preferably has the proportion greater than 10.It especially can be made by gold or platinum, and balance wheel 10 and hairspring 12 are made by adamas.Like this, the ratio between moment of inertia and the proportion is particularly to be fit to.
Must be pointed out,, also can add material in this or therefrom remove material, more specifically on wheel rim 16c according to the material of making former 16.
Although above show specific embodiment, yet some variations can occur in according to mechnical oscillator of the present invention and can not change its function.Therefore, all these variations also all can be imagined and be conceived.
Claims (19)
1. the clock and watch mechnical oscillator that comprises balance wheel (10) and hairspring (12), wherein said balance wheel (10) is made by the first identical material with described hairspring (12).
2. mechnical oscillator as claimed in claim 1, it is characterized in that, described balance wheel (10) comprises former (16), keep the axle (14) of described former (16) and be installed in counterweight (18,19) on the described former (16), and described axle (14) and described counterweight (18,19) are made by at least a second other material.
3. mechnical oscillator as claimed in claim 2 is characterized in that, described axle (14) make by hardened steel and at least a portion of described counterweight (18) by density greater than 15g/cm
3Heavy material make.
4. as the described mechnical oscillator of any one claim of front, it is characterized in that it is 2 * 10 that described first material has maximal value
-6Ppm/C ° low thermal coefficient of expansion.
5. as the described mechnical oscillator of any one claim of front, it is characterized in that described first material is non magnetic.
6. as the described mechnical oscillator of any one claim of front, it is characterized in that the apparent density of described first material is at 2.0-5.0g/cm
3Scope in.
7. as the described mechnical oscillator of any one claim of front, it is characterized in that described first material is adamas, quartz or ceramic-like.
8. mechnical oscillator as claimed in claim 7 is characterized in that, described first material is based on adamantine.
9. as the described mechnical oscillator of any one claim of front, it is characterized in that described clock and watch are watches.
10. as the described mechnical oscillator of any one claim of front, it is characterized in that described balance wheel (10) comprises the former (16) of thickness in the 0.05mm-0.3mm scope.
11. comprise the clock and watch mechnical oscillator of balance wheel (10) and hairspring (12), wherein said balance wheel (10) comprising:
The former of making by first material (16);
Keep described former (16) and be intended to guarantee the axle (14) that balance wheel rotates around rotation;
Be installed in the counterweight (18,19) on the described former (16), described counterweight is symmetrical arranged with respect to described rotation,
Described hairspring (12) is made by second material, and described first and second materials are chosen from adamas and quartz.
12. mechnical oscillator as claimed in claim 11 is characterized in that, described first and second materials are identical.
13. as claim 11 or 12 described mechnical oscillators, it is characterized in that, at least a portion of described counterweight (18) has cylindrical with respect to the axis of symmetry in it is engaged in part in the described former (16), described counterweight (18) has the symmetrical structure with respect to the described axis of symmetry.
14., it is characterized in that described counterweight (18) is made greater than 10 the 3rd material by having proportion as any one described mechnical oscillator among the claim 11-13.
15. mechnical oscillator as claimed in claim 14 is characterized in that, described the 3rd material is that density is greater than 15g/cm
3Heavy material.
16., it is characterized in that described first material is an adamas as any one described mechnical oscillator among the claim 11-15.
17., it is characterized in that described former (16) has thickness in the 0.05mm-0.3mm scope as any one described mechnical oscillator among the claim 11-16.
18., wherein, symmetrically described material is removed from least one described symmetrical counterweight (18) with respect to the axis of symmetry of described counterweight (18) by remove the trim method of material from the balance wheel (10) of mechnical oscillator as claimed in claim 13.
19. the trim method of the balance wheel (10) by material being added into mechnical oscillator as claimed in claim 13 wherein, is added into material the counterweight (18) of at least one described symmetry symmetrically with respect to the axis of described counterweight (18).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06026620 | 2006-12-21 | ||
| EP06026620.2 | 2006-12-21 | ||
| CH02119/06 | 2006-12-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101589347A true CN101589347A (en) | 2009-11-25 |
Family
ID=41372746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800470503A Pending CN101589347A (en) | 2006-12-21 | 2007-12-20 | Mechanical oscillator for timepiece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101589347A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789162A (en) * | 2011-05-13 | 2012-11-21 | 宝齐莱手表有限公司 | Balance wheel of watch and watch |
| CN103097966A (en) * | 2010-07-19 | 2013-05-08 | 尼瓦洛克斯-法尔股份有限公司 | Balance having inertia adjustment using an insert |
| CN103676600A (en) * | 2012-09-04 | 2014-03-26 | 斯沃奇集团研究和开发有限公司 | Resonator with matched balance spring and balance |
| CN103890666A (en) * | 2011-10-24 | 2014-06-25 | 劳力士有限公司 | Oscillator for a clock movement |
| CN104797989A (en) * | 2012-11-16 | 2015-07-22 | 尼瓦洛克斯-法尔股份有限公司 | Resonator that is less sensitive to climatic variations |
| CN104937502A (en) * | 2013-01-22 | 2015-09-23 | 蒙特雷布勒盖股份有限公司 | Device for guiding timepiece arbor |
| CN107615182A (en) * | 2015-06-15 | 2018-01-19 | 西铁城时计株式会社 | The arrangements for speed regulation of clock |
| TWI659278B (en) * | 2014-03-05 | 2019-05-11 | 瑞士商尼瓦克斯 法爾公司 | Balance spring and resonator for a timepiece |
| CN111492318A (en) * | 2017-12-22 | 2020-08-04 | 斯沃奇集团研究和开发有限公司 | Balance for a timepiece and method of manufacturing such a balance |
| CN111610707A (en) * | 2019-02-25 | 2020-09-01 | 精工电子有限公司 | Temperature compensation type balance wheel hairspring mechanism, movement and clock |
| CN112965355A (en) * | 2017-12-22 | 2021-06-15 | 斯沃奇集团研究和开发有限公司 | Method for manufacturing balance wheel of clock |
| CN114035413A (en) * | 2016-07-19 | 2022-02-11 | 尼瓦洛克斯-法尔股份有限公司 | Component for a timepiece movement |
-
2007
- 2007-12-20 CN CNA2007800470503A patent/CN101589347A/en active Pending
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103097966A (en) * | 2010-07-19 | 2013-05-08 | 尼瓦洛克斯-法尔股份有限公司 | Balance having inertia adjustment using an insert |
| CN103097966B (en) * | 2010-07-19 | 2014-09-17 | 尼瓦洛克斯-法尔股份有限公司 | Balance having inertia adjustment using an insert |
| CN102789162A (en) * | 2011-05-13 | 2012-11-21 | 宝齐莱手表有限公司 | Balance wheel of watch and watch |
| US9740170B2 (en) | 2011-10-24 | 2017-08-22 | Rolex Sa | Oscillator for a clock movement |
| CN103890666A (en) * | 2011-10-24 | 2014-06-25 | 劳力士有限公司 | Oscillator for a clock movement |
| CN103890666B (en) * | 2011-10-24 | 2017-10-13 | 劳力士有限公司 | Oscillator for watch and clock movement |
| CN103676600A (en) * | 2012-09-04 | 2014-03-26 | 斯沃奇集团研究和开发有限公司 | Resonator with matched balance spring and balance |
| CN103676600B (en) * | 2012-09-04 | 2016-09-07 | 斯沃奇集团研究和开发有限公司 | There is the hairspring of coupling and the resonator of escapement |
| CN104797989A (en) * | 2012-11-16 | 2015-07-22 | 尼瓦洛克斯-法尔股份有限公司 | Resonator that is less sensitive to climatic variations |
| CN104797989B (en) * | 2012-11-16 | 2017-08-08 | 尼瓦洛克斯-法尔股份有限公司 | To the resonator of the susceptibility reduction of climate change |
| CN104937502B (en) * | 2013-01-22 | 2017-07-28 | 蒙特雷布勒盖股份有限公司 | Device for guiding clock and watch heart axle |
| CN104937502A (en) * | 2013-01-22 | 2015-09-23 | 蒙特雷布勒盖股份有限公司 | Device for guiding timepiece arbor |
| TWI659278B (en) * | 2014-03-05 | 2019-05-11 | 瑞士商尼瓦克斯 法爾公司 | Balance spring and resonator for a timepiece |
| CN107615182A (en) * | 2015-06-15 | 2018-01-19 | 西铁城时计株式会社 | The arrangements for speed regulation of clock |
| CN107615182B (en) * | 2015-06-15 | 2020-02-07 | 西铁城时计株式会社 | Speed regulator for clock |
| CN114035413A (en) * | 2016-07-19 | 2022-02-11 | 尼瓦洛克斯-法尔股份有限公司 | Component for a timepiece movement |
| CN112965355A (en) * | 2017-12-22 | 2021-06-15 | 斯沃奇集团研究和开发有限公司 | Method for manufacturing balance wheel of clock |
| CN111492318A (en) * | 2017-12-22 | 2020-08-04 | 斯沃奇集团研究和开发有限公司 | Balance for a timepiece and method of manufacturing such a balance |
| US11307535B2 (en) | 2017-12-22 | 2022-04-19 | The Swatch Group Research And Development Ltd | Process for producing a balance wheel for a timepiece |
| US11640140B2 (en) | 2017-12-22 | 2023-05-02 | The Swatch Group Research And Development Ltd | Process for producing a balance wheel for a timepiece |
| US11809137B2 (en) | 2017-12-22 | 2023-11-07 | The Swatch Group Research And Development Ltd | Balance for timepieces and method for manufacturing the same |
| CN111610707A (en) * | 2019-02-25 | 2020-09-01 | 精工电子有限公司 | Temperature compensation type balance wheel hairspring mechanism, movement and clock |
| CN111610707B (en) * | 2019-02-25 | 2022-07-26 | 精工电子有限公司 | Temperature compensation type balance wheel hairspring mechanism, movement and clock |
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Application publication date: 20091125 |