EP3452874A1 - Spiral d'horlogerie - Google Patents
Spiral d'horlogerieInfo
- Publication number
- EP3452874A1 EP3452874A1 EP17721468.1A EP17721468A EP3452874A1 EP 3452874 A1 EP3452874 A1 EP 3452874A1 EP 17721468 A EP17721468 A EP 17721468A EP 3452874 A1 EP3452874 A1 EP 3452874A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- spiral
- relief angle
- flanks
- spiral according
- 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
Links
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
- G04B17/06—Oscillators with hairsprings, e.g. balance
- G04B17/066—Manufacture of the spiral spring
Definitions
- the present invention relates to a spiral intended to be associated with a balance to form an oscillator (regulating member) of a watch movement.
- the present invention aims to remedy this drawback or at least to mitigate it, and proposes for this purpose a hairspring according to claim 1 and a spiral manufacturing method according to claim 9.
- FIG. 1 is a top view showing a hairspring according to a particular embodiment of the invention, with its shell, and a clamp for fixing the outer end of the hairspring;
- Figure 2 is a radial section through three adjacent turns of the spiral shown in Figure 1.
- a hairspring 1 is intended to be mounted on a balance shaft A by means of a shell 2 to form with the balance the oscillator of a watch movement.
- the hairspring 1 consists of a blade 3 wound in a spiral from an inner end 4 joined to the ferrule 2 to an outer end 5 to be fixed to the frame of the movement through one or more organs.
- the outer end 5 of the blade 3 is extended by a rigid attachment portion 6 which is held by a clamp 7 mounted on the frame of the movement, as described in EP 178061 1 of the applicant.
- the outer end 5 could however be fixed to the frame in another way, for example by means of a traditional stud.
- the assembly comprising the blade 3, the ferrule 2 and the rigid fixing portion 6 may be monolithic, as shown, and be made of silicon by deep reactive ion etching (DRIE).
- the average plane in which the blade 3 is wound is designated by P in FIG. 2.
- This average plane P is located at mid-height between an upper surface 8 and a lower surface 9 of the blade 3, surfaces 8, 9 which typically are flat and parallel.
- This mean plane P passes through the two flanks 10, 1 1 of the blade 3 which each connect the upper surface 8 to the lower surface 9.
- These two flanks 10, 1 1 are rectilinear in radial section, that is to say in a plane containing the imaginary oscillation axis O of the spiral 1, and have a low roughness.
- the flanks 10, 1 1 of the blade 3, in radial section are not perpendicular to the average plane P but are each inclined by a draft angle a (visible only in FIG. equal to 2.5 °, preferably greater than or equal to 3 °, more preferably greater than or equal to 4 °, more preferably greater than or equal to 5 ° and typically between 2.5 ° and 20 °, more particularly between 2.5 ° and 6 °, giving the radial section of the blade 3 a trapezoidal shape.
- a draft angle a visible only in FIG. equal to 2.5 °, preferably greater than or equal to 3 °, more preferably greater than or equal to 4 °, more preferably greater than or equal to 5 ° and typically between 2.5 ° and 20 °, more particularly between 2.5 ° and 6 °, giving the radial section of the blade 3 a trapezoidal shape.
- the flanks 10, 1 1 thus form, in radial section, an angle ⁇ greater than or equal to 5 °, preferably greater than or equal to 6 °, more preferably greater than or equal to 8 °, more preferably greater than or equal to at 10 °, and typically between 5 ° and 40 °, more particularly between 5 ° and 12 °.
- Such angles can be obtained by adjusting the parameters of the DRIE method, in particular the ratio between the etching and passivation times.
- each flank of the monolithic assembly 2, 3, 6 can be tilted from the draft angle a.
- the present invention does not exclude, however, that the draft angle has differed from one flank to another.
- the turns of the hairspring 1 can move radially and touch.
- the contact between the turns can not be plane, unless the turns twist.
- the absence of plane contact over a sufficient height prevents the turns from adhering to each other.
- the higher the draft angle the more difficult it is for the turns to twist sufficiently.
- the risk of gluing the turns together is thus reduced.
- the present invention also reduces the risk of bonding between the first turn and the ferrule 2 and between the last turn and the clamp 7 or other fastener to the frame of the movement, in case of shock or mishandling.
- Another advantage of the hairspring according to the present invention is that, thanks to its straight flanks 10, 11, it is relatively easy to manufacture.
- the present invention is applicable to other materials than silicon, for example silicon carbide, boron nitride, glasses, ceramics or diamond, and other manufacturing processes.
- the DRIE engraving for example laser machining, molding, etc.
- the spiral according to the invention may be coated with one or more layers, for example a silicon oxide layer in the case of a silicon spiral.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16167917 | 2016-05-02 | ||
PCT/IB2017/052407 WO2017191533A1 (fr) | 2016-05-02 | 2017-04-26 | Spiral d'horlogerie |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3452874A1 true EP3452874A1 (fr) | 2019-03-13 |
EP3452874B1 EP3452874B1 (fr) | 2020-06-10 |
Family
ID=55910166
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17721468.1A Active EP3452874B1 (fr) | 2016-05-02 | 2017-04-26 | Spiral d'horlogerie |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3452874B1 (fr) |
WO (1) | WO2017191533A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3418816B1 (fr) * | 2017-06-20 | 2019-10-16 | Lakeview Innovation Ltd. | Balancier spiral comprenant une section transversale en forme de losange pour un mécanisme d'horlogerie d'un mouvement de montre et procédé de fabrication du balancier spiral |
WO2019103977A1 (fr) * | 2017-11-21 | 2019-05-31 | Firehouse Horology, Inc. | Géométries de spiraux pour montres mécaniques obtenues par nanofabrication |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH327796A (fr) * | 1954-02-22 | 1958-02-15 | Horlogerie Suisse S A Asuag | Spiral plat |
CH700805B1 (fr) | 2005-10-25 | 2010-10-29 | Patek Philippe Sa Geneve | Dispositif régulateur pour pièce d'horlogerie et mouvement d'horlogerie comprenant un tel dispositif. |
KR20090103819A (ko) * | 2008-03-28 | 2009-10-01 | 니바록스-파 에스.에이. | 일체형의 헤어스프링 및 이의 제조 방법 |
CH704686B1 (fr) * | 2011-03-23 | 2016-06-30 | Lvmh Swiss Mft Sa | Ressort horloger pour montre-bracelet. |
FR2992745B1 (fr) * | 2012-06-28 | 2015-03-27 | Philippe Rhul | Spiral guide de la lumiere, systeme de controle in-situ d'un mouvement d'horlogerie equipe de ce spiral, et dispositif portable de controle |
WO2014023584A1 (fr) * | 2012-08-07 | 2014-02-13 | Eta Sa Manufacture Horlogere Suisse | Système oscillant pour mouvement d'horlogerie |
EP2804054B1 (fr) * | 2013-05-17 | 2020-09-23 | ETA SA Manufacture Horlogère Suisse | Dispositif anti-adhésion d'un spiral sur un pont |
-
2017
- 2017-04-26 EP EP17721468.1A patent/EP3452874B1/fr active Active
- 2017-04-26 WO PCT/IB2017/052407 patent/WO2017191533A1/fr unknown
Also Published As
Publication number | Publication date |
---|---|
EP3452874B1 (fr) | 2020-06-10 |
WO2017191533A1 (fr) | 2017-11-09 |
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