EP1930794B1 - Magnetic control device for a clock piece - Google Patents

Magnetic control device for a clock piece Download PDF

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Publication number
EP1930794B1
EP1930794B1 EP06123744A EP06123744A EP1930794B1 EP 1930794 B1 EP1930794 B1 EP 1930794B1 EP 06123744 A EP06123744 A EP 06123744A EP 06123744 A EP06123744 A EP 06123744A EP 1930794 B1 EP1930794 B1 EP 1930794B1
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EP
European Patent Office
Prior art keywords
magnet
magnetic
stem
order
sealed tube
Prior art date
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Application number
EP06123744A
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German (de)
French (fr)
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EP1930794A1 (en
Inventor
Jean-Jacques Born
François Gueissaz
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Swatch Group Research and Development SA
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Swatch Group Research and Development SA
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Publication date
Application filed by Swatch Group Research and Development SA filed Critical Swatch Group Research and Development SA
Priority to EP06123744A priority Critical patent/EP1930794B1/en
Priority to DE602006019749T priority patent/DE602006019749D1/en
Priority to AT06123744T priority patent/ATE496319T1/en
Priority to SG200717413-9A priority patent/SG143141A1/en
Priority to JP2007287075A priority patent/JP2008122377A/en
Priority to CN200710159620XA priority patent/CN101201587B/en
Priority to KR1020070114013A priority patent/KR101391517B1/en
Priority to US11/937,660 priority patent/US7404667B2/en
Publication of EP1930794A1 publication Critical patent/EP1930794A1/en
Priority to HK08113326.0A priority patent/HK1122366A1/en
Application granted granted Critical
Publication of EP1930794B1 publication Critical patent/EP1930794B1/en
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Anticipated expiration legal-status Critical

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C23/00—Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals
    • G04C23/02—Constructional details
    • G04C23/06—Driving or regulating means
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/001—Electromechanical switches for setting or display
    • G04C3/004—Magnetically controlled
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H25/00—Switches with compound movement of handle or other operating part
    • H01H25/06—Operating part movable both angularly and rectilinearly, the rectilinear movement being along the axis of angular movement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H01H36/006—Permanent magnet actuating reed switches comprising a plurality of reed switches, e.g. selectors or joystick-operated

Definitions

  • the present invention relates to a magnetic device for controlling a timepiece and more particularly to a magnetic device comprising a manually operable control member that can selectively occupy several positions and move from one to the other by a translational movement. .
  • This device of the prior art has certain defects. Firstly, it is not very discreet since the guide rail extends almost the entire length of one side of the watch. In addition, it does not seem that it is possible to greatly reduce the size of this device of the prior art. Indeed, the configuration described requires to have all Reed contactors side by side on a line. However, the width of the smallest known Reed contactors is close to one millimeter. In addition, the magnetic field must be intense enough to act through the thickness of the middle part of the watch. Under these conditions, it is necessary to space the contactors sufficiently to prevent two contactors from being closed at the same time.
  • An object of the present invention is therefore to provide a control device operating without mechanical or electrical connection between the outside and the inside of the timepiece and which is more compact than those of the prior art.
  • Another object of the present invention is to provide a control device in which the amplitude of the movement of the translation to be operated by the control member is greatly reduced.
  • Another object is to provide a magnetic control device that can have the outward appearance of a conventional mechanical control device.
  • Yet another object of the present invention is to provide a magnetic control device whose control member can be easily adapted to be operated also in rotation, in the manner of a conventional control rod.
  • the present invention achieves these objects by providing a magnetic control device according to claim 1.
  • the waterproof tube is immune to possible shocks.
  • the wall of the tube does not need to be as thick as the outer wall of the timepiece.
  • Another advantage of the present invention is that the rod and the first magnet are inserted into the sealed tube. In these conditions, only the end of the stem that emerges from the timepiece is visible. Thus, the magnet and the rest of the control device are not visible. It is therefore possible to provide a control device that has the appearance of a traditional control rod.
  • Another advantage of the present invention is that only two magnetic sensors are required to enable the electronic means to distinguish three positions of the first magnet (and even four positions according to a variant). Thanks to this characteristic, the control device according to the invention can be more compact. On the other hand, the fact of limiting the number of magnetic sensors makes it possible to reduce the cost price.
  • the positions of the first and second reed switches are angularly offset relative to the axis of the sealed tube.
  • the contactors are not arranged in the extension of one another, it is possible to freely choose their spacing in the direction of the longitudinal axis of the rod, without having to worry about possible interference between contactors. According to this variant, it is therefore possible to produce a control device in which the amplitude of the translational movement that the control member must operate is reduced to a minimum.
  • the Figure 1A represents a particular embodiment of the control device according to the present invention.
  • the magnetic control device 1 is mounted in the middle part 2 of a watch.
  • a tube reference 3
  • the tube 3 is made of a magnetic material, such as stainless steel for example. It is a sealed tube open at one of its ends.
  • the tube 3 is substantially completely contained in the middle part. Only the open end of the tube opens on the outside of the watch.
  • the wall of the tube has a greater thickness.
  • This portion 7 is shaped to fit into the opening 4 of the middle part, so as to form a junction as tight as possible.
  • the seal is reinforced by an o-ring type seal (referenced 5) which is disposed in an annular groove 6 also arranged in part 7.
  • Part 7 still has a circular outer shoulder 9 provided to bear on a complementary shoulder 10 of the opening 4.
  • a room 14 arranged in the proximal end of the tube. This recess is provided to receive a coil spring 15.
  • the tube 3 extends radially from the edge of the middle part 2 towards the center of the watch. It will therefore be understood that the presence of the tube could be an obstacle to introduce certain components into the watch case during assembly of the watch. In particular, if it is an analog watch, the tube 3 could be an obstacle when introducing the movement into the box. To avoid this kind of problem, it is possible to plan to install the tube only after the installation of the other elements to take place in the watch case. Once the tube is inserted, it can stay in place once and for all. The seal between the tube 3 and the middle part 2 is therefore a gasket. Under these conditions, the sealing means which have just been described make it possible to ensure long-term sealing.
  • the manual control device of the device according to the invention is constituted by a cylindrical rod 12 inserted into the tube 3.
  • the rod 12 is provided to both slide and turn inside the tube 3.
  • One end of the rod 12 emerges from the tube through the opening 4 and, as can be seen in the figure, this end ends with a button 13 in the form of a crown.
  • the button (or crown) 13 has on its underside an annular recess in which are housed the cylindrical proximal end of the tube 3 and the coil spring 15. It is seen that the crown 13 covers the proximal end and the spring 15, in the manner of a cap.
  • the cylindrical outer face of the proximal end of the tube is designed to slide inside the annular recess of the ring, so as to vary the degree of interlocking of the tube 3 and the ring 13.
  • the ring being secured to the rod 12, this axial movement of the ring relative to the tube 3 causes the rod 12 to move in the tube.
  • the return spring 15 is a helical spring which is supported by a first of its ends against the bottom of the annular recess of the ring 13, and by its other end against the bottom of the recess 14. Under these conditions, when the carrier of the watch presses on the ring 13, it compresses the return spring 15 and sinks the proximal end of the tube 3 in the annular recess. Then, when the wearer of the watch releases its pressure on the ring 13, the return spring 15 tends to return the ring 13 and the rod 12 in their initial position.
  • the rod 12 has a profiled section of diameter substantially less than that of the rest of the rod.
  • This profiled section located at the level of the proximal portion 7 of the tube, is essentially formed of two grooves (referenced 16 and 17) and an inclined portion 18.
  • the two grooves 16, 17 and the inclined portion 18 are provided to cooperate with a circlip 19 of so as to form indexing means for maintaining or returning the rod in a selected axial position.
  • the tube 3 has a double milling symmetrical 20 which is provided to let the two branches of the circlip 19 is to maintain the latter in place.
  • the rod 12 extends between the two branches of the circlip.
  • a first magnet (referenced 21) integral with the rod 12 can move in translation inside the sealed tube 3.
  • This magnet 21 is provided to cooperate, through the wall of the tube, with a first and a second magnetic sensor placed inside the timepiece.
  • These magnetic sensors which are here Reed micro-contactors, are hereinafter abbreviated MR and referenced respectively 22 and 23.
  • MR and referenced respectively 22 and 23 are hereinafter abbreviated MR and referenced respectively 22 and 23.
  • these two MRs are arranged staggered along the sealed tube 3, so that they are at unequal distances from the distal end of the tube.
  • the first magnet 21 is driven coaxially in a bore formed in the end of the rod by which it is inserted into the tube 3.
  • a support plate 25 which carry the first and the second MR 22 and 23.
  • this support plate 25 may advantageously be constituted by the printed circuit board 25 of the electronic circuit of the watch.
  • a Reed micro-contactor is a sensitive contact to the magnetic field.
  • MR can be in two states. Indeed, it closes in the presence of a field whose component in the direction of the MR axis is sufficiently intense. In the opposite case, when the value of the field component in the direction of the MR axis does not exceed a certain threshold, the contact remains open.
  • An MR is therefore suitable for use as a two-state magnetic sensor for detecting the presence of a magnetic field whose intensity in a given direction exceeds a certain value.
  • the MR 22 and 23 are oriented with their axis parallel to the axis of the sealed tube 3 and therefore also oriented parallel to the north-south axis of the first magnet 21.
  • An advantage related to the parallel orientation of MR 22 and 23 and magnet 21 will now be explained with reference to the Figure 2B .
  • This figure is a graph showing the variation of the intensity of the flux of the magnetic field inside the blades of a Reed micro-contactor as a function of the longitudinal position occupied by the magnet. As we can see, the graph actually has two curves. The first curve, in solid line, corresponds to the values calculated for the case where the MR is closed (the two blades of the MR being in contact).
  • the second curve corresponds to the case where the MR is open. In particular, it can be verified that the flux intensity is always greater when the MR is closed.
  • the magnetic flux reaches its maximum in the center of the graph at the point of zero abscissa. This abscissa point zero corresponds to the situation where the magnet and the MR are side by side. It can be seen that, in this central region of the graph, the intensity of the magnetic flux is represented as being negative. This characteristic corresponds to the fact that when the magnet and the MR are side by side, the magnetization of the blades of the MR is in opposition to the polarization of the magnet.
  • the two horizontal lines arranged at equal distances above and below the ordinate zero on the Figure 2B indicate the MR sensitivity threshold. It can be seen that, in the present example, the force of the magnet has been chosen, at the same time, large enough so that the intensity of the flux largely exceeds the closure threshold in the center of the graph, and small enough so that the intensity of flux remains below this threshold everywhere else. It can be seen that, in absolute value, the intensity of the magnetic flux decreases rapidly as the magnet shifts relative to the MR. At the point where the intensity of the magnetic flux quickly reaches the zero value on either side of the zero abscissa, before growing again to reach two local maximums of less amplitude.
  • the two MR 22 and 23 are therefore arranged at locations where the orientation of the field lines is substantially perpendicular to the axis of the magnet 21.
  • a closer examination of the distribution of the field lines makes it possible to realize that the longitudinal spacing between the two MRs corresponds to the width of one of the loops drawn by these lines of fields.
  • the further the axes of the MRs are away from the axis of the magnet the more the MRs must be spaced longitudinally.
  • the position of the magnet 21 shown in solid lines on the figure 3A corresponds to the rest position (0) of the rod.
  • the positions of the magnet corresponding to the drawn position (1) and to the pushed position (-1) are represented by two rectangles in broken lines.
  • the figure shows that when the rod 12 is in the pulled position, the magnet is in the immediate vicinity of the first MR 22. In this position, the magnetic field is sufficient to close the MR 22.
  • position (-1) the magnet 21 is in close proximity to the second MR 23.
  • the MR 23 is closed, while the first MR 22 is open.
  • the magnet 21 and the MR 22 are not quite side by side. Indeed, as long as the force of the magnet is adapted to the sensitivity of the MRs, the magnetic field is sufficient to close the MR even when there is a lag between the latter and the magnet. So, according to what is represented on the figure 3A , the stroke of the rod 12 or, in other words, the distance separating the pulled position "1" from the pushed position "-1", can be considerably shorter than the spacing between the MRs 22 and 23.
  • the figure 3B represents the configuration of the magnet 21 'and the MR 22' and 23 'according to a second variant. As in the previous variant, the two MRs are arranged symmetrically on either side of the rest position "0" of the magnet. However, in the variant of figure 3B , both MR 22 'and 23' are much closer together so that in the rest position, they are both closed.
  • the position of the magnet 21 'shown in solid lines on the figure 3B corresponds to the drawn position (1) of the rod. It can be seen in the figure that the position of the MR 23 'corresponds to a location where the orientation of the field lines is substantially perpendicular to the MR axis. In the pulled position "1", the MR 23 'is open.
  • the MR 22 ' meanwhile, is closed.
  • the MR 22 ' is open and the MR 23' closed in the pushed position "-1" of the magnet 21 '.
  • the stroke of the rod is slightly longer than in the previous variant.
  • the variant of figure 3B to the advantage of allowing to have a fourth predefined position of the magnet (referenced "2" in the figure).
  • this fourth predefined position a second position drawn for example, the two MRs are open.
  • the figure 3B also allows to consider a third variant with three predefined positions. Indeed, if for one reason or another, the length of the sealed tube 3 must be limited, it may be advantageous not to use the position referenced "-1" in the figure and limit the stroke of the magnet 21 ' at the interval between the "2" and "0" positions.
  • the figure 3C represents the configuration of the magnet 21 "and the MR 22" and 23 "according to a fourth variant
  • the fourth variant is an asymmetrical variant compatible, for example, with the use of a tight tube 3 of low
  • the position of the magnet 21 "shown in solid lines on the figure 3C corresponds to the rest position "0" of the rod. It can be seen in the figure that the position of the MR 23 "corresponds to a location where the orientation of the lines field is substantially perpendicular to the MR axis. In the "0" rest position, the MR 23 "is open and the MR 22" is directly opposite the magnet. It is closed.
  • MRs described in this example must be small in size. However, there are MRs small enough to suit such applications.
  • MicroReed-14 developed by the company ASULAB SA, CH-2074 Marin, Switzerland.
  • the control device shown comprises a second magnet (referenced 26) which is opposite a third and a fourth MR (respectively referenced 27 and 28).
  • the magnet 26 is inserted into a transverse passage pierced in the rod 12.
  • the MR 27 and 28 are mounted on supports 29, 30 which are themselves fixed on the support plate 25 which already carried the first two MR 22 and 23.
  • the MR 27 and 28 have their axis oriented perpendicular to the axis of the rod 12 and that they are arranged symmetrically on either side of the projection of the axis of the rod 12 on the plate 25, in the immediate vicinity of the sealed tube 3.
  • the magnet 26 and the MR 27 and 28 are provided to detect the rotations of the rod 12.
  • the rotation of the magnet 26 causes a cyclic succession of openings and closures of each of the two MR 27 and 28.
  • the MR 27 and 28 thus switch with a frequency of two cycles per revolution, and the period separating two consecutive closures (or two openings) of the same MR corresponds to a rotation of 180 ° of the rod 12.
  • two MR 27 and 28 switch with the same frequency, and it will be understood that this frequency depends on the speed of rotation of the rod.
  • the two MR 27 and 28 form between them an angle of about 135 ° relative to the axis of rotation of the rod 12.
  • This angular offset results in a phase shift of ⁇ / 2 (or - ⁇ / 2) between the cycles of the two MRs.
  • the sign of this phase shift or in other words the order in which the MRs open and close, gives the direction of rotation of the rod 12.
  • a single Reed contactor (the MR 27 or the MR 28) is sufficient to detect the rotations of the rod 12. Indeed, as we have seen, the use of two MR offset angularly can detect the direction of rotation of the rod. However, in applications for which it is not necessary to distinguish between a direction of rotation and the other, it is sufficient that the electronic circuit of the watch has access to the switches of a single MR.
  • the MR 27 and 28 are not placed exactly opposite the magnet 26. Indeed, in the present example, the MR 27 and 28 are provided to cooperate with the magnet 26 no only when the rod 12 is in the rest position (position 0) as in the Figure 1A , but also when the rod is pulled out (position 1). This is the reason why a slight shift is planned between the RMs and the second magnet. The contactors are actually placed halfway between the position of the magnet in the pulled position of the rod, and the position of the magnet in the rest position.
  • the watch equipped with the magnetic control device of the present example notably comprises, in the usual way, electronic means (not shown) comprising a time base, and display means controlled by these electronic means.
  • the four magnetic sensors (the MR 22, 23, 27 and 28) are connected to the electronic means in a manner known to those skilled in the art.
  • the electronic means are provided for detecting the state of each of the magnetic sensors, and for processing this information as four binary signals.
  • the "yes” and “no" binary expressions have been preferred to the terms “open” and “closed” to denote in the figures the state of a magnetic sensor according to the invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The device (1) has a movable control member manually actuated from outside of a timepiece i.e. watch. A magnet (21) is fixed to the control member. A sealed tube (3) comprises a distal blind end that extends toward an inside of the timepiece and a proximal end that opens toward the outside of the timepiece. Two magnetic sensors (22, 23) are disposed spaced-apart along the sealed tube such that three predefined positions of the magnet are respectively associated with three different combinations of a sensor state with another sensor state.

Description

La présente invention concerne un dispositif magnétique de commande d'une pièce d'horlogerie et plus particulièrement un dispositif magnétique comportant un organe de commande actionnable manuellement et pouvant occuper sélectivement plusieurs positions et passer de l'une à l'autre par un mouvement de translation.The present invention relates to a magnetic device for controlling a timepiece and more particularly to a magnetic device comprising a manually operable control member that can selectively occupy several positions and move from one to the other by a translational movement. .

De tels dispositifs magnétiques de commande sont déjà connus de l'homme du métier. Le document de brevet US 4'038'814 , notamment, décrit plusieurs modes de réalisation d'un tel dispositif. En particulier, le mode de réalisation décrit en référence aux figures 6 et 7 concerne une montre bracelet de forme extérieure généralement rectangulaire, et dont un des côtés porte un rail de guidage. Un curseur en plastique contenant un aimant est prévu pour coulisser le long de ce rail. Un nombre non spécifié de contacteurs Reed sont disposés à l'intérieur de la montre face au rail de guidage. En faisant coulisser l'aimant, le porteur de la montre peut fermer sélectivement l'un ou l'autre des contacteurs Reed et, ainsi, commander la montre. Ce dispositif de commande fonctionne donc sans liaison mécanique ou électrique entre l'extérieur et l'intérieur de la montre.Such magnetic control devices are already known to those skilled in the art. The patent document US 4'038'814 in particular, describes several embodiments of such a device. In particular, the embodiment described with reference to Figures 6 and 7 relates to a wristwatch of generally rectangular outer shape, and one side carries a guide rail. A plastic slider containing a magnet is provided for sliding along this rail. An unspecified number of Reed switches are disposed inside the watch facing the guide rail. By sliding the magnet, the wearer of the watch can selectively close one or the other of the Reed switches and thus control the watch. This control device therefore operates without mechanical or electrical connection between the outside and the inside of the watch.

Ce dispositif de l'art antérieur présente certains défauts. Tout d'abord, il est peu discret puisque le rail de guidage s'étend pratiquement sur toute la longueur d'un des côtés de la montre. De plus, il ne semble pas qu'il soit possible de réduire beaucoup la taille de ce dispositif de l'art antérieur. En effet, la configuration décrite impose de disposer tous les contacteurs Reed côte à côte sur une ligne. Or, la largeur des plus petits contacteurs Reed connus avoisine le millimètre. De plus, le champ magnétique doit être assez intense pour agir à travers l'épaisseur de la carrure de la montre. Dans ces conditions, il est nécessaire d'espacer les contacteurs suffisamment pour éviter que deux contacteurs ne soient fermés en même temps.This device of the prior art has certain defects. Firstly, it is not very discreet since the guide rail extends almost the entire length of one side of the watch. In addition, it does not seem that it is possible to greatly reduce the size of this device of the prior art. Indeed, the configuration described requires to have all Reed contactors side by side on a line. However, the width of the smallest known Reed contactors is close to one millimeter. In addition, the magnetic field must be intense enough to act through the thickness of the middle part of the watch. Under these conditions, it is necessary to space the contactors sufficiently to prevent two contactors from being closed at the same time.

Un but de la présente invention est donc de fournir un dispositif de commande fonctionnant sans liaison mécanique ou électrique entre l'extérieur et l'intérieur de la pièce d'horlogerie et qui soit plus compact que ceux de l'art antérieur.An object of the present invention is therefore to provide a control device operating without mechanical or electrical connection between the outside and the inside of the timepiece and which is more compact than those of the prior art.

Un autre but de la présente invention est de fournir un dispositif de commande dans lequel l'amplitude du mouvement de la translation que doit opérer l'organe de commande est fortement réduite.Another object of the present invention is to provide a control device in which the amplitude of the movement of the translation to be operated by the control member is greatly reduced.

Un autre but est de fournir un dispositif magnétique de commande qui puisse avoir l'apparence extérieure d'un dispositif de commande mécanique traditionnel.Another object is to provide a magnetic control device that can have the outward appearance of a conventional mechanical control device.

Encore un autre but de la présente invention est de fournir un dispositif magnétique de commande dont l'organe de commande puisse être facilement adapté pour être actionné également en rotation, à la manière d'une tige de commande traditionnelle.Yet another object of the present invention is to provide a magnetic control device whose control member can be easily adapted to be operated also in rotation, in the manner of a conventional control rod.

La présente invention atteint ces buts en fournissant un dispositif magnétique de commande conforme à la revendication 1.The present invention achieves these objects by providing a magnetic control device according to claim 1.

Contrairement à la boîte de montre elle-même, le tube étanche est à l'abri de chocs éventuels. La paroi du tube n'a donc pas besoin d'être aussi épaisse que la paroi extérieure de la pièce d'horlogerie. Ainsi, il est possible d'arranger les contacteurs Reed à faible distance de la trajectoire de l'aimant, dans une zone de fort gradient du champ. En conséquence, un avantage de la présente invention réside dans la possibilité de fournir un dispositif capable de détecter même un petit déplacement de l'aimant.Unlike the watch case itself, the waterproof tube is immune to possible shocks. The wall of the tube does not need to be as thick as the outer wall of the timepiece. Thus, it is possible to arrange the Reed contactors at a small distance from the path of the magnet, in a zone of strong gradient of the field. Accordingly, an advantage of the present invention lies in the ability to provide a device capable of detecting even a small displacement of the magnet.

Un autre avantage de la présente invention est que la tige et le premier aimant sont insérés dans le tube étanche. Dans ces conditions, seul l'extrémité de la tige qui émerge de la pièce d'horlogerie est visible. Ainsi, l'aimant et le reste du dispositif de commande ne sont pas visibles. Il est donc possible de fournir un dispositif de commande qui a l'apparence d'une tige de commande traditionnelle.Another advantage of the present invention is that the rod and the first magnet are inserted into the sealed tube. In these conditions, only the end of the stem that emerges from the timepiece is visible. Thus, the magnet and the rest of the control device are not visible. It is therefore possible to provide a control device that has the appearance of a traditional control rod.

Un autre avantage de la présente invention est qu'il suffit de deux capteurs magnétiques pour permettre aux moyens électroniques de distinguer trois positions du premier aimant (et même quatre positions selon une variante). Grâce à cette caractéristique, le dispositif de commande selon l'invention peut être plus compact. D'autre part, le fait de limiter le nombre de capteurs magnétiques permet de réduire le coût de revient.Another advantage of the present invention is that only two magnetic sensors are required to enable the electronic means to distinguish three positions of the first magnet (and even four positions according to a variant). Thanks to this characteristic, the control device according to the invention can be more compact. On the other hand, the fact of limiting the number of magnetic sensors makes it possible to reduce the cost price.

Selon une variante avantageuse de la présente invention, les positions du premier et du deuxième contacteur Reed sont décalées angulairement relativement à l'axe du tube étanche. Les contacteurs n'étant donc pas disposés dans le prolongement l'un de l'autre, il est possible de choisir librement leur espacement dans la direction de l'axe longitudinal de la tige, sans devoir se préoccuper d'éventuelles interférences entre contacteurs. Selon cette variante, il est donc possible de réaliser un dispositif de commande dans lequel l'amplitude du mouvement de translation que doit opérer l'organe de commande est réduite au minimum.According to an advantageous variant of the present invention, the positions of the first and second reed switches are angularly offset relative to the axis of the sealed tube. The contactors are not arranged in the extension of one another, it is possible to freely choose their spacing in the direction of the longitudinal axis of the rod, without having to worry about possible interference between contactors. According to this variant, it is therefore possible to produce a control device in which the amplitude of the translational movement that the control member must operate is reduced to a minimum.

D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple non limitatif, et faite en référence aux dessins annexés dans lesquels :

  • la figure 1A est une vue de dessus en coupe d'un dispositif magnétique de commande pour pièce d'horlogerie selon un mode particulier de réalisation de l'invention ;
  • la figure 1B est une coupe transversale selon l'axe I-I de la figure 1A ;
  • la figure 2A est une coupe transversale selon l'axe 2-2 de la figure 1A ;
  • la figure 2B est un graphique du flux magnétique dans les lames d'un micro-contacteur Reed en fonction de la position de l'aimant ;
  • la figure 3A est une vue de dessus montrant la configuration de l'aimant et des premier et deuxième contacteurs Reed selon une première variante du mode de réalisation de la figure 1A ;
  • la figure 3B est un vue de dessus montrant la configuration de l'aimant et des premier et deuxième contacteurs Reed selon une deuxième variante du mode de réalisation de la figure 1 ;
  • la figure 3C est un vue de dessus montrant la configuration de l'aimant et des premier et deuxième contacteurs Reed selon une quatrième variante du mode de réalisation de la figure 1 ;
  • la figure 4 est une vue en coupe transversale selon l'axe IV-IV de la figure 1A.
Other features and advantages of the present invention will appear on reading the following description, given solely by way of non-limiting example, and with reference to the appended drawings in which:
  • the Figure 1A is a sectional top view of a magnetic control device for a timepiece according to a particular embodiment of the invention;
  • the Figure 1B is a cross-section along axis II of the Figure 1A ;
  • the Figure 2A is a cross section along the 2-2 axis of the Figure 1A ;
  • the Figure 2B is a graph of the magnetic flux in the blades of a Reed micro-contactor as a function of the position of the magnet;
  • the figure 3A is a top view showing the configuration of the magnet and the first and second Reed contactors according to a first variant of the embodiment of the Figure 1A ;
  • the figure 3B is a top view showing the configuration of the magnet and the first and second Reed contactors according to a second variant of the embodiment of the figure 1 ;
  • the figure 3C is a top view showing the configuration of the magnet and the first and second Reed contactors according to a fourth variant of the embodiment of the figure 1 ;
  • the figure 4 is a cross-sectional view along the axis IV-IV of the Figure 1A .

La figure 1A représente un mode de réalisation particulier du dispositif de commande selon la présente invention. Dans cet exemple, le dispositif magnétique de commande 1 est monté dans la carrure 2 d'une montre. On voit sur le dessin qu'un tube (référencé 3) est inséré dans une ouverture 4 aménagée dans le bord de la carrure 2. Le tube 3 est réalisé en un matériau a magnétique, comme de l'inox par exemple. Il s'agit d'un tube étanche ouvert à une seule de ses extrémités. On voit sur la figure 1A que, dans le mode de réalisation qui fait l'objet du présent exemple, le tube 3 est pratiquement entièrement contenu dans la carrure. Seul l'extrémité ouverte du tube débouche sur l'extérieur de la montre. On comprendra toutefois, que selon d'autres modes de réalisation de la présente invention, il est possible que seul la partie distale du tube, proche de l'extrémité fermée (ou borgne), soit insérée dans la carrure. Dans ces conditions, la partie proximale du tube, proche de l'extrémité ouverte, dépasserait de la carrure de manière à surélever la couronne 13.The Figure 1A represents a particular embodiment of the control device according to the present invention. In this example, the magnetic control device 1 is mounted in the middle part 2 of a watch. We see in the drawing that a tube (reference 3) is inserted into an opening 4 arranged in the edge of the middle part 2. The tube 3 is made of a magnetic material, such as stainless steel for example. It is a sealed tube open at one of its ends. We see on the Figure 1A that in the embodiment which is the subject of this example, the tube 3 is substantially completely contained in the middle part. Only the open end of the tube opens on the outside of the watch. It will be understood, however, that according to other embodiments of the present invention, it is possible that only the distal portion of the tube, close to the closed end (or blind), is inserted into the middle part. Under these conditions, the proximal portion of the tube, close to the open end, protrude from the middle part so as to raise the crown 13.

On voit que, dans la partie du tube 3 située près de son extrémité ouverte (appelée ci-après partie proximale du tube, et référencée 7), la paroi du tube présente une plus grande épaisseur. Cette partie 7 est conformée pour s'ajuster dans l'ouverture 4 de la carrure, de manière à former une jonction le plus étanche possible. D'autre part, comme le montre encore la figure 1A, l'étanchéité est renforcée par un joint de type « o-ring » (référencé 5) qui est disposé dans une gorge annulaire 6 également aménagée dans la partie 7. La partie 7 présente encore un épaulement extérieur circulaire 9 prévu pour venir en appui sur un épaulement complémentaire 10 de l'ouverture 4. On voit encore sur la figure 1A un chambrage 14 aménagé dans l'extrémité proximale du tube. Ce chambrage est prévu pour recevoir un ressort hélicoïdal 15.It can be seen that in the part of the tube 3 located near its open end (hereinafter referred to as the proximal portion of the tube, and referenced 7), the wall of the tube has a greater thickness. This portion 7 is shaped to fit into the opening 4 of the middle part, so as to form a junction as tight as possible. On the other hand, as shown again Figure 1A , the seal is reinforced by an o-ring type seal (referenced 5) which is disposed in an annular groove 6 also arranged in part 7. Part 7 still has a circular outer shoulder 9 provided to bear on a complementary shoulder 10 of the opening 4. We still see on the Figure 1A a room 14 arranged in the proximal end of the tube. This recess is provided to receive a coil spring 15.

Selon le présent mode de réalisation, le tube 3 s'étend radialement à partir du bord de la carrure 2 en direction du centre de la montre. On comprendra donc que la présence du tube pourrait constituer un obstacle pour introduire certains composants dans la boîte de montre lors du montage de la montre. En particulier, s'il s'agit d'une montre analogique, le tube 3 pourrait constituer un obstacle lors de l'introduction du mouvement dans la boîte. Pour éviter ce genre de problème, il est possible de prévoir de mettre en place le tube seulement après l'installation des autres éléments devant prendre place dans la boîte de montre. Une fois le tube inséré, il peut rester en place une fois pour toute. Le joint entre le tube 3 et la carrure 2 est donc un joint statique. Dans ces conditions, les moyens d'étanchéité qui viennent d'être décrits permettent d'assurer l'étanchéité à long terme.According to the present embodiment, the tube 3 extends radially from the edge of the middle part 2 towards the center of the watch. It will therefore be understood that the presence of the tube could be an obstacle to introduce certain components into the watch case during assembly of the watch. In particular, if it is an analog watch, the tube 3 could be an obstacle when introducing the movement into the box. To avoid this kind of problem, it is possible to plan to install the tube only after the installation of the other elements to take place in the watch case. Once the tube is inserted, it can stay in place once and for all. The seal between the tube 3 and the middle part 2 is therefore a gasket. Under these conditions, the sealing means which have just been described make it possible to ensure long-term sealing.

Dans le présent exemple, l'organe de commande manuel du dispositif selon l'invention est constitué par une tige cylindrique 12 insérée dans le tube 3. La tige 12 est prévue pour, tout à la fois, coulisser et tourner à l'intérieur du tube 3. Une des extrémités de la tige 12 émerge du tube par l'ouverture 4 et, comme on peut le voir sur la figure, cette extrémité se termine par un bouton 13 en forme de couronne. On voit également que le bouton (ou couronne) 13 présente sur sa face inférieure un évidement annulaire dans lequel viennent se loger l'extrémité proximale cylindrique du tube 3 et le ressort hélicoïdal 15. On voit que la couronne 13 recouvre l'extrémité proximale et le ressort 15, à la manière d'un capuchon. La face extérieure cylindrique de l'extrémité proximale du tube est conçue pour coulisser à l'intérieur de l'évidement annulaire de la couronne, de manière à faire varier le degré d'emboîtement du tube 3 et de la couronne 13. La couronne étant solidaire de la tige 12, ce mouvement axial de la couronne par rapport au tube 3 entraîne le déplacement de la tige 12 dans le tube.In the present example, the manual control device of the device according to the invention is constituted by a cylindrical rod 12 inserted into the tube 3. The rod 12 is provided to both slide and turn inside the tube 3. One end of the rod 12 emerges from the tube through the opening 4 and, as can be seen in the figure, this end ends with a button 13 in the form of a crown. We also see that the button (or crown) 13 has on its underside an annular recess in which are housed the cylindrical proximal end of the tube 3 and the coil spring 15. It is seen that the crown 13 covers the proximal end and the spring 15, in the manner of a cap. The cylindrical outer face of the proximal end of the tube is designed to slide inside the annular recess of the ring, so as to vary the degree of interlocking of the tube 3 and the ring 13. The ring being secured to the rod 12, this axial movement of the ring relative to the tube 3 causes the rod 12 to move in the tube.

Le ressort de rappel 15 est un ressort hélicoïdal qui prend appui par une première de ses extrémités contre le fond de l'évidement annulaire de la couronne 13, et par son autre extrémité contre le fond du chambrage 14. Dans ces conditions, lorsque le porteur de la montre presse sur la couronne 13, il comprime le ressort de rappel 15 et fait s'enfoncer l'extrémité proximale du tube 3 dans l'évidement annulaire. Ensuite, lorsque le porteur de la montre relâche sa pression sur la couronne 13, le ressort de rappel 15 a tendance à rappeler la couronne 13 et la tige 12 dans leur position initiale.The return spring 15 is a helical spring which is supported by a first of its ends against the bottom of the annular recess of the ring 13, and by its other end against the bottom of the recess 14. Under these conditions, when the carrier of the watch presses on the ring 13, it compresses the return spring 15 and sinks the proximal end of the tube 3 in the annular recess. Then, when the wearer of the watch releases its pressure on the ring 13, the return spring 15 tends to return the ring 13 and the rod 12 in their initial position.

On voit encore sur la figure 1 que la tige 12 présente un tronçon profilé de diamètre sensiblement inférieur à celui du reste de la tige. Ce tronçon profilé, situé au niveau de la partie proximale 7 du tube, est essentiellement formé de deux gorges (référencées 16 et 17) ainsi que d'une partie inclinée 18. Les deux gorges 16, 17 et la partie inclinée 18 sont prévues pour coopérer avec un circlips 19 de manière à former des moyens d'indexation servant à maintenir ou à rappeler la tige dans une position axiale sélectionnée. Le tube 3 présente un double fraisage 20 symétrique qui est prévu pour laisser passer les deux branches du circlips 19 est pour maintenir ce dernier en place. Conformément à ce qui est représenté sur la figure 1B, la tige 12 s'étend entre les deux branches du circlips.We still see on the figure 1 that the rod 12 has a profiled section of diameter substantially less than that of the rest of the rod. This profiled section, located at the level of the proximal portion 7 of the tube, is essentially formed of two grooves (referenced 16 and 17) and an inclined portion 18. The two grooves 16, 17 and the inclined portion 18 are provided to cooperate with a circlip 19 of so as to form indexing means for maintaining or returning the rod in a selected axial position. The tube 3 has a double milling symmetrical 20 which is provided to let the two branches of the circlip 19 is to maintain the latter in place. In accordance with what is shown on the Figure 1B , the rod 12 extends between the two branches of the circlip.

A l'instar de ce qui est connu avec les couronnes-poussoirs traditionnelles, en pressant ou en tirant sur la couronne 13, le porteur de la montre peut amener la tige 12 du dispositif magnétique de commande 1 du présent exemple à occuper sélectivement trois positions prédéfinies différentes :

  • une première position (dite position de repos ou position « 0 ») dans laquelle le circlips est engagé dans la première gorge référencée 16 ;
  • une deuxième position (dite position tirée ou position « 1 ») dans laquelle le circlips est engagé dans la seconde gorge référencée 17 ;
une troisième position (dite position poussée ou position « -1 ») dans laquelle le circlips coopère avec la partie inclinée 18. Dans cette position fugitive, la tige 12 est rappelée en position de repos, par l'effet conjugué de la partie inclinée 18 et du ressort de rappel 15, dès que le porteur de la montre relâche sa pression sur la couronne 13.As is known with traditional push-on crowns, by pressing or pulling on the crown 13, the wearer of the watch can bring the rod 12 of the magnetic control device 1 of the present example to selectively occupy three positions. different predefined ones:
  • a first position (called rest position or position "0") in which the circlip is engaged in the first groove referenced 16;
  • a second position (called pulled position or position "1") in which the circlip is engaged in the second groove referenced 17;
a third position (called pushed position or position "-1") in which the circlip cooperates with the inclined portion 18. In this fugitive position, the rod 12 is returned to the rest position by the combined effect of the inclined portion 18 and the return spring 15, as soon as the wearer of the watch releases its pressure on the crown 13.

Conformément à la présente invention, un premier aimant (référencé 21) solidaire de la tige 12 peut se déplacer en translation à l'intérieur du tube étanche 3. Cet aimant 21 est prévu pour coopérer, à travers la paroi du tube, avec un premier et un deuxième capteur magnétique placés à l'intérieur de la pièce d'horlogerie. Ces capteurs magnétiques, qui sont ici des micro-contacteurs Reed, sont désignés ci-après par l'abréviation MR et référencés respectivement 22 et 23. Comme on peut le voir sur la figure 1A, ces deux MR sont arrangés de manière échelonnée le long du tube étanche 3, de sorte qu'ils se trouvent à des distances inégales de l'extrémité distale du tube. Comme on peut le voir sur les figures 1A et 2A, dans le présent exemple, le premier aimant 21 est chassé coaxialement dans un alésage formé dans l'extrémité de la tige par laquelle celle-ci est insérée dans le tube 3. On voit encore sur les figures une plaque support 25 qui portent le premier et le deuxième MR 22 et 23. Comme nous le verrons encore plus loin, cette plaque support 25 peut avantageusement être constituées par la carte à circuit imprimé 25 du circuit électronique de la montre.According to the present invention, a first magnet (referenced 21) integral with the rod 12 can move in translation inside the sealed tube 3. This magnet 21 is provided to cooperate, through the wall of the tube, with a first and a second magnetic sensor placed inside the timepiece. These magnetic sensors, which are here Reed micro-contactors, are hereinafter abbreviated MR and referenced respectively 22 and 23. As can be seen on the Figure 1A these two MRs are arranged staggered along the sealed tube 3, so that they are at unequal distances from the distal end of the tube. As can be seen on the Figures 1A and 2A in the present example, the first magnet 21 is driven coaxially in a bore formed in the end of the rod by which it is inserted into the tube 3. It is still seen in the figures a support plate 25 which carry the first and the second MR 22 and 23. As will be seen further below, this support plate 25 may advantageously be constituted by the printed circuit board 25 of the electronic circuit of the watch.

Un micro-contacteur Reed (ou MR) est un contact sensible au champ magnétique. Le MR peut être dans deux états. En effet, il se ferme en présence d'un champ dont la composante dans la direction de l'axe du MR est suffisamment intense. Dans le cas contraire, lorsque la valeur de la composante du champ dans la direction de l'axe du MR ne dépasse pas un certain seuil, le contact reste ouvert. Un MR se prête donc à être utilisé comme capteur magnétique à deux états pour détecter la présence d'un champ magnétique dont l'intensité dans une direction donnée dépasse une certaine valeur.A Reed micro-contactor (or MR) is a sensitive contact to the magnetic field. MR can be in two states. Indeed, it closes in the presence of a field whose component in the direction of the MR axis is sufficiently intense. In the opposite case, when the value of the field component in the direction of the MR axis does not exceed a certain threshold, the contact remains open. An MR is therefore suitable for use as a two-state magnetic sensor for detecting the presence of a magnetic field whose intensity in a given direction exceeds a certain value.

Selon la variante de l'invention qui fait l'objet du présent exemple, les MR 22 et 23 sont orientés avec leur axe parallèle à l'axe du tube étanche 3 et donc également orientés parallèlement à l'axe Nord-Sud du premier aimant 21. Un avantage lié à l'orientation parallèle des MR 22 et 23 et de l'aimant 21 va maintenant être expliqué en référence à la figure 2B. Cette figure est un graphique indiquant la variation de l'intensité du flux du champ magnétique à l'intérieur des lames d'un micro-contacteur Reed en fonction de la position longitudinale occupée par l'aimant. Comme on peut le constater, le graphique comporte en fait deux courbes. La première courbe, en trait continu, correspond aux valeurs calculées pour le cas où le MR est fermé (les deux lames du MR étant donc en contact). La deuxième courbe, en trait interrompu, correspond au cas ou le MR est ouvert. On peut vérifier en particulier que l'intensité du flux est toujours plus grande lorsque le MR est fermé. On voit d'autre part que le flux magnétique atteint son maximum au centre du graphique au point d'abscisse zéro. Ce point d'abscisse zéro correspond à la situation où l'aimant et le MR sont côte à côte. On constate que, dans cette région centrale du graphique, l'intensité du flux magnétique est représentée comme étant négative. Cette caractéristique correspond au fait que lorsque l'aimant et le MR sont côte à côte, la magnétisation des lames du MR est en sens contraire de la polarisation de l'aimant.According to the variant of the invention which is the subject of this example, the MR 22 and 23 are oriented with their axis parallel to the axis of the sealed tube 3 and therefore also oriented parallel to the north-south axis of the first magnet 21. An advantage related to the parallel orientation of MR 22 and 23 and magnet 21 will now be explained with reference to the Figure 2B . This figure is a graph showing the variation of the intensity of the flux of the magnetic field inside the blades of a Reed micro-contactor as a function of the longitudinal position occupied by the magnet. As we can see, the graph actually has two curves. The first curve, in solid line, corresponds to the values calculated for the case where the MR is closed (the two blades of the MR being in contact). The second curve, in broken line, corresponds to the case where the MR is open. In particular, it can be verified that the flux intensity is always greater when the MR is closed. On the other hand, we see that the magnetic flux reaches its maximum in the center of the graph at the point of zero abscissa. This abscissa point zero corresponds to the situation where the magnet and the MR are side by side. It can be seen that, in this central region of the graph, the intensity of the magnetic flux is represented as being negative. This characteristic corresponds to the fact that when the magnet and the MR are side by side, the magnetization of the blades of the MR is in opposition to the polarization of the magnet.

Les deux lignes horizontales disposées à distances égales en dessus et en dessous de l'ordonnée zéro sur la figure 2B indiquent le seuil de sensibilité du MR. On voit que, dans le présent exemple, la force de l'aimant a été choisie, tout à la fois, assez grande pour que l'intensité du flux dépasse largement le seuil de fermeture au centre du graphique, et assez petite pour que l'intensité du flux reste en deçà de ce seuil partout ailleurs. On voit en effet, qu'en valeur absolue, l'intensité du flux magnétique décroît rapidement à mesure que l'aimant se décale par rapport au MR. Au point que l'intensité du flux magnétique atteint rapidement la valeur zéro de part et d'autre de l'abscisse zéro, avant de croître à nouveau pour atteindre deux maximum locaux de moindre amplitude. Comme on le verra encore plus loin, l'existence de deux positions, situées à relativement courte distance du maximum et où le flux magnétique est nul, n'est pas due à la faiblesse du champ magnétique, mais à l'orientation des lignes de champ qui sont perpendiculaires à l'axe du MR. Un avantage de cette caractéristique va maintenant être expliqué en référence aux figures 1A et 3A. Sur ces figures, la position du premier aimant 21 correspond à la position de repos (position 0) de la tige 12. On voit, qu'en position de repos, le premier et le deuxième MR 22 et 23 sont disposés symétriquement par rapport à l'aimant 21 qui se trouve donc à mi-distance entre les deux. On peut de plus observer sur la figure 3A que la position des MR 22 et 23 correspond aux deux emplacements où les lignes de champ sont sensiblement perpendiculaires aux axes des MR. On a vu plus haut qu'une orientation perpendiculaire des lignes de champ rendait le flux magnétique dans l'axe du MR égal à zéro. La configuration représentée correspond donc à une situation où les deux MR sont ouverts. De plus, à la lumière de ce qui précède, on comprendra que le fait que les deux MR sont ouverts s'explique avant tout par des considérations géométriques et ne dépend que marginalement de l'intensité du champ magnétique. Un avantage de cet état de fait est qu'il autorise de produire l'invention en série avec des tolérances de fabrication usuelles sans crainte excessive des conséquences pouvant découler d'une variation de sensibilité entre exemplaires.The two horizontal lines arranged at equal distances above and below the ordinate zero on the Figure 2B indicate the MR sensitivity threshold. It can be seen that, in the present example, the force of the magnet has been chosen, at the same time, large enough so that the intensity of the flux largely exceeds the closure threshold in the center of the graph, and small enough so that the intensity of flux remains below this threshold everywhere else. It can be seen that, in absolute value, the intensity of the magnetic flux decreases rapidly as the magnet shifts relative to the MR. At the point where the intensity of the magnetic flux quickly reaches the zero value on either side of the zero abscissa, before growing again to reach two local maximums of less amplitude. As will be seen later, the existence of two positions, situated at a relatively short distance from the maximum and where the magnetic flux is zero, is not due to the weakness of the magnetic field, but to the orientation of the field lines which are perpendicular to the axis from the MR. An advantage of this feature will now be explained with reference to Figures 1A and 3A . In these figures, the position of the first magnet 21 corresponds to the rest position (position 0) of the rod 12. It can be seen that, in the rest position, the first and the second MR 22 and 23 are arranged symmetrically with respect to the magnet 21 which is therefore halfway between the two. We can also observe on the figure 3A that the position of the MRs 22 and 23 corresponds to the two locations where the field lines are substantially perpendicular to the axes of the MRs. It has been seen above that a perpendicular orientation of the field lines made the magnetic flux in the MR axis equal to zero. The configuration represented therefore corresponds to a situation where the two MRs are open. In addition, in light of the foregoing, it will be appreciated that the fact that the two MRs are open is primarily explained by geometrical considerations and only marginally depends on the intensity of the magnetic field. An advantage of this state of affairs is that it makes it possible to produce the invention in series with usual manufacturing tolerances without undue fear of the consequences that may result from a variation in sensitivity between copies.

Les deux MR 22 et 23 sont donc disposés à des emplacements où l'orientation des lignes de champ est sensiblement perpendiculaire à l'axe de l'aimant 21. Un examen plus approfondi de la distribution des lignes de champ permet de se rendre compte que l'espacement longitudinal entre les deux MR correspond à la largeur d'une des boucles dessinées par ces lignes de champs. Ainsi, dans le présent exemple, plus les axes des MR sont éloignés de l'axe de l'aimant, plus les MR doivent être espacés longitudinalement. Dans ces conditions, on comprendra que, grâce au recours au tube 3, ayant une paroi de faible épaisseur et permettant donc d'avoir les MR à proximité de l'axe de la tige, il est possible de réduire considérablement la distance séparant les trois positions prédéfinies « 1 », « 0 » et « -1 » de l'aimant 21 et donc de raccourcir considérablement la course de la tige 12.The two MR 22 and 23 are therefore arranged at locations where the orientation of the field lines is substantially perpendicular to the axis of the magnet 21. A closer examination of the distribution of the field lines makes it possible to realize that the longitudinal spacing between the two MRs corresponds to the width of one of the loops drawn by these lines of fields. Thus, in the present example, the further the axes of the MRs are away from the axis of the magnet, the more the MRs must be spaced longitudinally. Under these conditions, it will be understood that, thanks to the use of the tube 3, having a thin wall and thus allowing to have the MR close to the axis of the rod, it is possible to significantly reduce the distance between the three predefined positions "1", "0" and "-1" of the magnet 21 and thus greatly shorten the stroke of the rod 12.

La position de l'aimant 21 représentée en traits pleins sur la figure 3A correspond à la position de repos (0) de la tige. Toutefois, on a encore représenté les positions de l'aimant correspondant à la position tirée (1) et à la position poussée (-1) par deux rectangles en traits interrompus. La figure montre que lorsque la tige 12 est en position tirée, l'aimant se trouve à proximité immédiate du premier MR 22. Dans cette position, le champ magnétique suffit pour fermer le MR 22. Le second MR 23, quant à lui, est suffisamment éloigné de l'aimant 21 pour être ouvert dans cette position. Lorsque la tige 12 est en position poussée, la situation est inversée. En position (-1), l'aimant 21 se trouve à proximité immédiate du second MR 23. Le MR 23 est donc fermé, alors que le premier MR 22 est ouvert. On voit encore sur la figure 3A, qu'en position tirée « 1 », l'aimant 21 et le MR 22 ne sont pas tout à fait côte à côte. En effet, pour autant que la force de l'aimant soit adaptée à la sensibilité des MR, le champ magnétique est suffisant pour fermer le MR même lorsqu'il existe un certain décalage entre ce dernier et l'aimant. Ainsi, conformément à ce qui est représenté sur la figure 3A, la course de la tige 12 ou, autrement dit, la distance séparant la position tirée « 1 » de la position poussée « -1 », peut être considérablement plus courte que l'espacement entre les MR 22 et 23.The position of the magnet 21 shown in solid lines on the figure 3A corresponds to the rest position (0) of the rod. However, the positions of the magnet corresponding to the drawn position (1) and to the pushed position (-1) are represented by two rectangles in broken lines. The figure shows that when the rod 12 is in the pulled position, the magnet is in the immediate vicinity of the first MR 22. In this position, the magnetic field is sufficient to close the MR 22. The second MR 23, meanwhile, is far enough away from the magnet 21 to be open in this position. When the rod 12 is in the pushed position, the situation is reversed. In position (-1), the magnet 21 is in close proximity to the second MR 23. The MR 23 is closed, while the first MR 22 is open. We still see on the figure 3A in the pulled position "1", the magnet 21 and the MR 22 are not quite side by side. Indeed, as long as the force of the magnet is adapted to the sensitivity of the MRs, the magnetic field is sufficient to close the MR even when there is a lag between the latter and the magnet. So, according to what is represented on the figure 3A , the stroke of the rod 12 or, in other words, the distance separating the pulled position "1" from the pushed position "-1", can be considerably shorter than the spacing between the MRs 22 and 23.

La figure 3B représente la configuration de l'aimant 21' et des MR 22' et 23' selon une deuxième variante. Comme dans la variante précédente, les deux MR sont disposés de manière symétrique de part est d'autre de la position de repos « 0 » de l'aimant. Toutefois, dans la variante de la figure 3B, les deux MR 22' et 23' sont beaucoup plus rapprochés de sorte qu'en position de repos, ils sont tous les deux fermés. La position de l'aimant 21' représentée en traits pleins sur la figure 3B correspond à la position tirée (1) de la tige. On peut voir sur la figure que la position du MR 23' correspond à un emplacement où l'orientation des lignes de champ est sensiblement perpendiculaire à l'axe du MR. En position tirée « 1 », le MR 23' est donc ouvert. Le MR 22', quant à lui, est fermé. D'autre part, on comprendra qu'en raison de la disposition symétrique des deux MR, le MR 22' est ouvert et le MR 23' fermé en position poussée « -1 » de l'aimant 21'. Selon cette deuxième variante, la course de la tige est très légèrement plus longue que dans la variante précédente. Toutefois, la variante de la figure 3B à l'avantage de permettre d'avoir une quatrième position prédéfinie de l'aimant (référencée « 2 » sur la figure). Dans cette quatrième position prédéfinie, une seconde position tirée par exemple, les deux MR sont ouverts. La figure 3B permet également d'envisager encore une troisième variante à trois positions prédéfinies. En effet, si pour une raison ou une autre, la longueur du tube étanche 3 doit être limitée, il peut être avantageux de ne pas exploiter la position référencée « -1 » sur la figure et de limiter la course de l'aimant 21' à l'intervalle entre les positions « 2 » et « 0 ».The figure 3B represents the configuration of the magnet 21 'and the MR 22' and 23 'according to a second variant. As in the previous variant, the two MRs are arranged symmetrically on either side of the rest position "0" of the magnet. However, in the variant of figure 3B , both MR 22 'and 23' are much closer together so that in the rest position, they are both closed. The position of the magnet 21 'shown in solid lines on the figure 3B corresponds to the drawn position (1) of the rod. It can be seen in the figure that the position of the MR 23 'corresponds to a location where the orientation of the field lines is substantially perpendicular to the MR axis. In the pulled position "1", the MR 23 'is open. The MR 22 ', meanwhile, is closed. On the other hand, it will be understood that due to the symmetrical arrangement of the two MRs, the MR 22 'is open and the MR 23' closed in the pushed position "-1" of the magnet 21 '. According to this second variant, the stroke of the rod is slightly longer than in the previous variant. However, the variant of figure 3B to the advantage of allowing to have a fourth predefined position of the magnet (referenced "2" in the figure). In this fourth predefined position, a second position drawn for example, the two MRs are open. The figure 3B also allows to consider a third variant with three predefined positions. Indeed, if for one reason or another, the length of the sealed tube 3 must be limited, it may be advantageous not to use the position referenced "-1" in the figure and limit the stroke of the magnet 21 ' at the interval between the "2" and "0" positions.

La figure 3C représente la configuration de l'aimant 21" et des MR 22" et 23" selon une quatrième variante. Comme la troisième variante, la quatrième est une variante asymétrique compatible, par exemple, avec l'utilisation d'un tube étanche 3 de faible longueur. La position de l'aimant 21" représentée en traits pleins sur la figure 3C correspond à la position de repos « 0 » de la tige. On peut voir sur la figure que la position du MR 23" correspond à un emplacement où l'orientation des lignes de champ est sensiblement perpendiculaire à l'axe du MR. En position de repos « 0 », le MR 23" est donc ouvert. Le MR 22", quant à lui, se trouve directement en regard de l'aimant. Il est donc fermé. D'autre part, on comprendra que pour des raisons de symétrie, la situation s'inverse en position poussée « -1 ». Dans cette position, le MR 23" est donc fermé et le MR 22" ouvert. Enfin, en position tirée « 1 » de l'aimant 21 ", les lignes de champ sont perpendiculaires à l'axe du MR 22" qui est donc ouvert. Le second MR 23"est, quant à lui, suffisamment éloigné de l'aimant 21" pour être ouvert également.The figure 3C represents the configuration of the magnet 21 "and the MR 22" and 23 "according to a fourth variant As the third variant, the fourth variant is an asymmetrical variant compatible, for example, with the use of a tight tube 3 of low The position of the magnet 21 "shown in solid lines on the figure 3C corresponds to the rest position "0" of the rod. It can be seen in the figure that the position of the MR 23 "corresponds to a location where the orientation of the lines field is substantially perpendicular to the MR axis. In the "0" rest position, the MR 23 "is open and the MR 22" is directly opposite the magnet. It is closed. On the other hand, it will be understood that for reasons of symmetry, the situation is reversed in the pushed position "-1". In this position, the MR 23 "is closed and the MR 22" open. Finally, in the pulled position "1" of the magnet 21 ", the field lines are perpendicular to the axis of the MR 22" which is thus open. The second MR 23 "is, for its part, sufficiently far from the magnet 21" to be open also.

On comprendra que les MR décrits dans le présent exemple doivent être de petite dimension. Toutefois, il existe des MR suffisamment petit pour convenir à de telles applications. On peut citer en particulier le MicroReed-14 développé par la société ASULAB SA, CH-2074 Marin, Suisse.It will be understood that the MRs described in this example must be small in size. However, there are MRs small enough to suit such applications. We can mention in particular the MicroReed-14 developed by the company ASULAB SA, CH-2074 Marin, Switzerland.

On comprendra d'autre part que diverses modifications et/ou améliorations évidentes pour un homme du métier peuvent être apportées au mode de réalisation qui fait l'objet de la présente description sans sortir du cadre de la présente invention définie par les revendications annexées. En particulier, la longueur de la course entre la position de repos et la position poussée n'a pas besoin d'être égale à celle entre la position de repos et la position tirée. D'autre part, la présente invention ne se limite évidemment pas à des modes de réalisation utilisant des contacteurs Reed comme capteurs magnétiques. A priori, tout capteur sensible à l'intensité d'un champ magnétique se prête à être mis en oeuvre dans la présente invention. Il est notamment possible d'utiliser des capteurs à effet Hall.It will be understood further that various modifications and / or improvements obvious to those skilled in the art can be made to the embodiment which is the subject of the present description without departing from the scope of the present invention defined by the appended claims. In particular, the length of the stroke between the rest position and the pushed position need not be equal to that between the rest position and the pulled position. On the other hand, the present invention is obviously not limited to embodiments using Reed contactors as magnetic sensors. At first sight, any sensor sensitive to the intensity of a magnetic field is suitable for use in the present invention. In particular, it is possible to use Hall effect sensors.

La suite de la description sera donnée en référence à la première variante (figure 3A) du mode de réalisation de la figure 1A. Selon cette variante, comme on l'a vu, le premier aimant 21 peut être amené par la tige 12 à occuper sélectivement les trois positions axiales prédéfinies suivantes :

  • la position (0) (correspondant à la position de repos de la tige 12) dans laquelle le premier et le deuxième MR 22, 23 sont tous les deux ouverts ;
  • la position (1) (correspondant à la position tirée de la tige 12) dans laquelle le premier MR 22 est fermé et le deuxième MR 23 est ouvert ;
  • la position (-1) (correspondant à la position poussée de la tige 12) dans laquelle le premier MR 22 est ouvert et le deuxième MR 23 est fermé.
The rest of the description will be given with reference to the first variant ( figure 3A ) of the embodiment of the Figure 1A . According to this variant, as we have seen, the first magnet 21 can be brought by the rod 12 to selectively occupy the three predefined axial positions:
  • the position (0) (corresponding to the rest position of the rod 12) in which the first and the second MR 22, 23 are both open;
  • the position (1) (corresponding to the position drawn from the rod 12) in which the first MR 22 is closed and the second MR 23 is open;
  • the position (-1) (corresponding to the pushed position of the rod 12) in which the first MR 22 is open and the second MR 23 is closed.

Si l'on se reporte à nouveau à la figure 1A, on voit que le dispositif de commande représenté comporte un deuxième aimant (référencé 26) qui se trouve en regard d'un troisième et d'un quatrième MR (respectivement référencés 27 et 28). Comme on peut le voir sur la figure 4 également, l'aimant 26 est inséré dans un passage transversal percé dans la tige 12. Dans le présent exemple, les MR 27 et 28 sont montés sur des supports 29 ,30 qui sont eux-mêmes fixés sur la plaque support 25 qui portait déjà les deux premiers MR 22 et 23. D'autre part, les MR 27 et 28 ont leur axe orienté perpendiculairement à l'axe de la tige 12 et qu'ils sont disposés symétriquement de part et d'autre de la projection de l'axe de la tige 12 sur la plaque 25, à proximité immédiate du tube étanche 3.If we go back to the Figure 1A it can be seen that the control device shown comprises a second magnet (referenced 26) which is opposite a third and a fourth MR (respectively referenced 27 and 28). As can be seen on the figure 4 also, the magnet 26 is inserted into a transverse passage pierced in the rod 12. In the present example, the MR 27 and 28 are mounted on supports 29, 30 which are themselves fixed on the support plate 25 which already carried the first two MR 22 and 23. On the other hand, the MR 27 and 28 have their axis oriented perpendicular to the axis of the rod 12 and that they are arranged symmetrically on either side of the projection of the axis of the rod 12 on the plate 25, in the immediate vicinity of the sealed tube 3.

L'aimant 26 et les MR 27 et 28 sont prévus pour détecter les rotations de la tige 12. Lorsque le porteur de la montre fait tourner la couronne 13, il entraîne le deuxième aimant 26 en rotation dans un plan transversal à l'axe de la tige 12. La rotation de l'aimant 26 provoque une succession cyclique d'ouvertures et de fermetures de chacun des deux MR 27 et 28. On comprendra que les MR s'ouvrent et se referment deux fois durant chaque tour de l'aimant. Les MR 27 et 28 commutent donc avec une fréquence de deux cycles par tour, et la période séparant deux fermetures (ou deux ouvertures) consécutives d'un même MR correspond donc à une rotation de 180° de la tige 12. De plus, les deux MR 27 et 28 commutent avec la même fréquence, et on comprendra que cette fréquence dépend de la vitesse de rotation de la tige.The magnet 26 and the MR 27 and 28 are provided to detect the rotations of the rod 12. When the wearer of the watch rotates the ring 13, it drives the second magnet 26 in rotation in a plane transverse to the axis of the rod 12. The rotation of the magnet 26 causes a cyclic succession of openings and closures of each of the two MR 27 and 28. It will be understood that the MRs open and close twice during each revolution of the magnet . The MR 27 and 28 thus switch with a frequency of two cycles per revolution, and the period separating two consecutive closures (or two openings) of the same MR corresponds to a rotation of 180 ° of the rod 12. two MR 27 and 28 switch with the same frequency, and it will be understood that this frequency depends on the speed of rotation of the rod.

Comme le montre encore la figure 4, les deux MR 27 et 28 forment entre eux un angle d'environ 135° relativement à l'axe de rotation de la tige 12. Un cycle complet accompli par l'un des MR correspondant à 180°, les 135° de décalage entre le MR 27 et le MR 28 correspondent au trois quarts d'un cycle. Ce décalage angulaire se traduit par un déphasage de π/2 (ou -π/2) entre les cycles des deux MR. Le signe de ce déphasage, ou autrement dit l'ordre dans lequel les MR s'ouvrent et se referment, donne le sens de rotation de la tige 12.As shown again figure 4 , the two MR 27 and 28 form between them an angle of about 135 ° relative to the axis of rotation of the rod 12. A complete cycle performed by one of the MR corresponding to 180 °, the 135 ° of difference between MR 27 and MR 28 correspond to three quarters of a cycle. This angular offset results in a phase shift of π / 2 (or -π / 2) between the cycles of the two MRs. The sign of this phase shift, or in other words the order in which the MRs open and close, gives the direction of rotation of the rod 12.

L'homme du métier comprendra que, selon une variante simplifiée, un seul contacteur Reed (le MR 27 ou le MR 28) suffit pour détecter les rotations de la tige 12. En effet, comme on l'a vu, l'utilisation de deux MR décalés angulairement permet de détecter le sens de la rotation de la tige. Toutefois, dans les applications pour lesquelles il n'est pas nécessaire de distinguer entre un sens de rotation et l'autre, il suffit que le circuit électronique de la montre ait accès aux commutations d'un seul MR.Those skilled in the art will understand that, according to a simplified variant, a single Reed contactor (the MR 27 or the MR 28) is sufficient to detect the rotations of the rod 12. Indeed, as we have seen, the use of two MR offset angularly can detect the direction of rotation of the rod. However, in applications for which it is not necessary to distinguish between a direction of rotation and the other, it is sufficient that the electronic circuit of the watch has access to the switches of a single MR.

Si l'on se reporte à nouveau à la figure 1A, on peut encore remarquer que sur le dessin les MR 27 et 28 ne sont pas placés exactement en face de l'aimant 26. En effet, dans le présent exemple, les MR 27 et 28 sont prévus pour coopérer avec l'aimant 26 non seulement lorsque la tige 12 est en position de repos (position 0) comme dans la figure 1A, mais également lorsque la tige est tirée (position 1). C'est la raison pour laquelle, un léger décalage est prévu entre les MR et le deuxième aimant. Les contacteurs sont en fait placés à mi-distance entre la position de l'aimant en position tirée de la tige, et la position de l'aimant en position de repos.If we go back to the Figure 1A it can also be noted that in the drawing the MR 27 and 28 are not placed exactly opposite the magnet 26. Indeed, in the present example, the MR 27 and 28 are provided to cooperate with the magnet 26 no only when the rod 12 is in the rest position (position 0) as in the Figure 1A , but also when the rod is pulled out (position 1). This is the reason why a slight shift is planned between the RMs and the second magnet. The contactors are actually placed halfway between the position of the magnet in the pulled position of the rod, and the position of the magnet in the rest position.

La montre équipée du dispositif magnétique de commande du présent exemple comporte notamment de façon habituelle des moyens électroniques (non représentés) comportant une base de temps, et des moyens d'affichage commandés par ces moyens électroniques. Les quatre capteurs magnétiques (les MR 22, 23, 27 et 28) sont reliés aux moyens électroniques d'une manière connue de l'homme du métier. Les moyens électroniques sont prévus pour détecter l'état de chacun des capteurs magnétiques, et pour traiter ces informations comme quatre signaux binaires. Par soucis de généralité, les expressions binaires « oui » et « non » ont été préférées aux expressions « ouvert » et « fermé » pour désigner sur les figures l'état d'un capteur magnétique selon l'invention.The watch equipped with the magnetic control device of the present example notably comprises, in the usual way, electronic means (not shown) comprising a time base, and display means controlled by these electronic means. The four magnetic sensors (the MR 22, 23, 27 and 28) are connected to the electronic means in a manner known to those skilled in the art. The electronic means are provided for detecting the state of each of the magnetic sensors, and for processing this information as four binary signals. For the sake of generality, the "yes" and "no" binary expressions have been preferred to the terms "open" and "closed" to denote in the figures the state of a magnetic sensor according to the invention.

Claims (13)

  1. Magnetic control device (1) of a timepiece comprising a moveable control member (12) which can be actuated manually from the outside of the timepiece, and a first magnet (21) which is fixed to the control member, the first magnet being provided in order to be displaced in translation on a trajectory connecting at least three predefined positions ("1 ", "0" "-1") when the wearer of the watch manipulates the control member (12), the device also comprising detection means situated inside the timepiece and provided in order to detect, amongst the three predefined positions, the position occupied by the first magnet (21), the detection means comprising at least one first and one second magnetic sensor (22, 23) which are able to be in a first or a second state (yes or no), and disposed in the vicinity of the trajectory of the first magnet (21) in order to cooperate with the latter; the device being characterised in that it comprises a sealed tube (3) which has a wall produced in a non-magnetic material, the sealed tube comprising a distal blind end which extends towards the inside of the timepiece and a proximal end which opens towards the outside of the timepiece, the device also being characterised in that the control member (12) has the general form of a stem provided in order to slide inside the sealed tube (3) and in that the first magnet (21) is provided in order to be displaced inside the tube (3) solid with the stem (12), the first and the second magnetic sensor (22, 23) being disposed spaced-apart along the sealed tube (3), in order that the three predefined positions ("1", "0" "-1") of the first magnet (21) are respectively associated with three different combinations of a state of the first sensor (22) with a state of the second sensor (23).
  2. Device according to claim 1, characterised in that the north-south axis of the first magnet (21) is orientated coaxially to the stem (12.)
  3. Device according to claim 1 or 2, characterised in that the axes of the first and of the second magnetic sensors (22, 23) are orientated parallel to the longitudinal axis of the sealed tube (3).
  4. Device according to claim 1, 2 or 3, characterised in that the first and the second magnetic sensor (22, 23) are offset angularly one relative to the other relative to the longitudinal axis of the sealed tube (3).
  5. Device according to any one of the preceding claims, characterised in that the first and the second magnetic sensor (22, 23) are mounted on the same printed circuit (25), the printed circuit being parallel to the longitudinal axis of the sealed tube (3).
  6. Device according to any one of the preceding claims, characterised in that the stem (12) is provided in order to turn inside the sealed tube (3) and in that the electronic detection means are provided in order to detect likewise the rotations of the stem.
  7. Device according to claim 6, characterised in that the electronic detection means comprise at least one third magnetic sensor (27) which is provided in order to cooperate with a second magnet (26) which is rigidly fixed to the stem (12) and orientated transversely relative to the axis of rotation of the stem.
  8. Device according to claim 6, characterised in that the electronic detection means comprise a third and a fourth magnetic sensor (27, 28) which are offset angularly relative to the axis of rotation of the stem (12), the third and the fourth sensor being provided in order to cooperate with a second magnet (26) which is rigidly fixed to the stem (12) and orientated transversely relative to the axis of rotation of the stem.
  9. Device according to claim 8, characterised in that the third and the fourth magnetic sensor (27, 28) are offset angularly by approx. 135°.
  10. Device according to any one of the preceding claims, characterised in that the sealed tube (3) is provided with a sealing joint (5) which is disposed near the proximal end, the sealing joint being provided in order to ensure the seal between the tube (3) and the middle part (2) of the timepiece.
  11. Device according to any one of the preceding claims, characterised in that the first magnetic sensor (22) is in the first state (yes) and the second sensor (23) in the second state (no) when the magnet (21) occupies a first predefined position, and in that the two magnetic sensors are in the same state when the magnet occupies a predefined second position, and in that the first magnetic sensor is in the second state (no) and the second sensor in the first state (yes) when the magnet occupies a third predefined position.
  12. Device according to any one of claims 1 to 10, characterised in that the two magnetic sensors (22, 23) are in the first state (yes) when the magnet (21) occupies a predefined first position, in that the two sensors are in different states (yes, no) when the magnet occupies a second predefined position, and in that the two magnetic sensors are in the second state (no) when the magnet occupies a third predefined position.
  13. Timepiece comprising a magnetic control device according to any one of the preceding claims.
EP06123744A 2006-11-09 2006-11-09 Magnetic control device for a clock piece Active EP1930794B1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP06123744A EP1930794B1 (en) 2006-11-09 2006-11-09 Magnetic control device for a clock piece
DE602006019749T DE602006019749D1 (en) 2006-11-09 2006-11-09 Magnetic device for actuating a clock
AT06123744T ATE496319T1 (en) 2006-11-09 2006-11-09 MAGNETIC DEVICE FOR ACTUATING A CLOCK
SG200717413-9A SG143141A1 (en) 2006-11-09 2007-11-02 Magnetic control device for timepiece
JP2007287075A JP2008122377A (en) 2006-11-09 2007-11-05 Magnetic controller for timepiece
CN200710159620XA CN101201587B (en) 2006-11-09 2007-11-09 Magnetic control device for timepiece
KR1020070114013A KR101391517B1 (en) 2006-11-09 2007-11-09 Magnetic control device for timepiece
US11/937,660 US7404667B2 (en) 2006-11-09 2007-11-09 Magnetic control device for timepiece
HK08113326.0A HK1122366A1 (en) 2006-11-09 2008-12-08 Magnetic control device for timepiece

Applications Claiming Priority (1)

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EP06123744A EP1930794B1 (en) 2006-11-09 2006-11-09 Magnetic control device for a clock piece

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EP1930794B1 true EP1930794B1 (en) 2011-01-19

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JP (1) JP2008122377A (en)
KR (1) KR101391517B1 (en)
CN (1) CN101201587B (en)
AT (1) ATE496319T1 (en)
DE (1) DE602006019749D1 (en)
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KR20080042733A (en) 2008-05-15
JP2008122377A (en) 2008-05-29
CN101201587B (en) 2011-04-13
ATE496319T1 (en) 2011-02-15
EP1930794A1 (en) 2008-06-11
US7404667B2 (en) 2008-07-29
HK1122366A1 (en) 2009-05-15
SG143141A1 (en) 2008-06-27
CN101201587A (en) 2008-06-18
US20080112275A1 (en) 2008-05-15
KR101391517B1 (en) 2014-05-07

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