CH712193A2 - Bimetallic device sensitive to temperature variations for watch components as well as for a temperature sensor. - Google Patents

Abstract

The invention relates to a bimetallic device (25) whose difference in expansion coefficient is between 10 and 10 - 6 K - 1 to provide thermal compensation to, for example, a clock resonator. The invention also relates to a compensating rocker (21), a racket, a temperature sensor and a compensating balance spring which include a bimetallic device according to the invention.

Description

Description

Field of the Invention [0001] The invention relates to a bimetallic device sensitive to temperature variations and in particular to such a device comprising two materials whose difference between the expansion coefficients makes it possible to vary the curvature as a function of the temperature change.

BACKGROUND OF THE INVENTION [0002] Bimetallic devices are known for manufacturing compensating balances with a cut serge formed of two half-rings each consisting of a first steel blade welded to a second brass blade. Thus formed, the serge opens when the temperature lowers and closes when the temperature rises to compensate for the effect of temperature on the elasticity of a hairspring. SUMMARY OF THE INVENTION [0003] The object of the present invention is to overcome all or part of the disadvantages mentioned above by proposing a bimetallic device alternative to those mentioned below.

For this purpose, the invention relates to a bimetallic device comprising at least a first silicon-based blade and at least a second metal-based blade characterized in that said at least one first and at least one second blades are arranged to attach to one another so that the curvature of the bimetallic device varies with temperature.

It is therefore understood that the difference in the expansion coefficient of the bimetallic device is approximately between 10 and 10-6 K-1 depending on the materials used. This difference, which is much greater than that of the steel-brass pair of approximately 6 × 10 -6 K -1, enables a higher sensitivity to the temperature of the bimetallic device.

In addition, it is possible to work with silicon-based materials and metal based on a wide variety of shapes and high manufacturing accuracy. For example, dry etching of the silicon-based material and electroforming of the metal-based material to the silicon-based material provides micron fabrication accuracy.

According to other advantageous variants of the invention: said at least one first silicon-based blade comprises monocrystalline silicon, doped monocrystalline silicon, polycrystalline silicon, doped polycrystalline silicon, porous silicon, silicon oxide, quartz, silica, silicon nitride or silicon carbide; said at least one second metal-based blade comprises silver, magnesium, lead, thallium, nickel, copper, zinc, gold, aluminum or indium or vulcanite; under ambient conditions of temperature and pressure, the bimetallic device forms a curved band; said at least one first and at least one second blades are attached to one another by interlocking and / or using an adhesion material and / or said at least one second blade is electroformed on said at least one a first blade; - The bimetallic device comprises a fastening base integral with one of said at least one first and at least one second blades for mounting the bimetallic device on a workpiece; - The bimetallic device comprises a block integral with the end of one of said at least one first and at least one second blades for increasing the influence of the bimetallic device; - The bimetallic device comprises adjustable stop means for limiting the minimum and / or maximum curvature variations of the bimetallic device; - The bimetallic device comprises a plurality of first blades arranged to attach to a single second blade, or conversely, a plurality of second blades arranged to attach to a single first blade.

According to a first embodiment, the invention relates to a compensating balance comprising at least one bimetallic device according to one of the preceding variants.

Therefore, the bimetallic device according to the invention can be advantageously used to provide a main or auxiliary heat compensation to a resonator by the pendulum.

According to a first alternative, the compensating balance comprises a cut serge formed by two bimetallic devices each connected by at least one arm to a central opening to change the inertia of the balance depending on the temperature.

According to a second alternative, the compensating balance comprises a monobloc serge connected by at least one arm to a central opening and in that said at least one bimetallic device is mounted on the serge to modify the inertia of the balance according to temperature.

According to a third alternative, the compensating balance comprises a monobloc serge connected by at least one arm to a central opening and in that said at least one bimetallic device is mounted on said at least one arm in order to modify the inertia of the pendulum depending on the temperature.

According to a second embodiment, the invention relates to a compensating racket comprising at least one bimetallic device according to one of the preceding variants.

Therefore, the bimetallic device according to the invention can be advantageously used to provide an auxiliary thermal compensation to a resonator by the raquetry with a very high accuracy.

According to a first alternative, the compensating racket may thus comprise a gap arranged to receive a spiral spring and connected to said at least one bimetallic device in order to modify the position of the gap as a function of the temperature.

According to a second alternative, the compensating racket may comprise a gap arranged to receive a spiral spring, the size of the gap being controlled by said at least one bimetallic device to modify the gap as a function of temperature.

According to a third embodiment, the invention relates to a temperature sensor comprising at least one bimetallic device according to one of the preceding variants.

Therefore, the bimetallic device according to the invention can be advantageously used to measure the temperature with a very high accuracy.

The temperature sensor may thus comprise a display and an elastic device for tracking the movement of said at least one bimetallic device in order to modify the position of the display as a function of the temperature.

Finally according to a fourth embodiment, the invention relates to a compensating hairspring comprising at least one bimetallic device according to one of the preceding variants.

Therefore, the bimetallic device according to the invention may in particular be advantageously used to provide auxiliary thermal compensation to a resonator by the point of pitonnage with a very high accuracy.

The compensating hairspring may thus comprise an outer turn connected to said at least one bimetallic device which is arranged to be fixed to a bridge in order to modify the active length of the compensating hairspring as a function of the temperature.

BRIEF DESCRIPTION OF THE DRAWINGS [0023] Other features and advantages will become clear from the description which is given hereinafter, by way of indication and in no way limitative, with reference to the accompanying drawings, in which: FIG. 1 is a schematic representation of a bimetallic device according to the invention; figs. 2 to 4 are partial representations of variants of a bimetallic device according to the invention; figs. 5 to 9 are alternative representations of a first embodiment using a bimetallic device according to the invention; figs. 10 and 11 are alternative representations of a second embodiment using a bimetallic device according to the invention; fig. 12 is a representation of a third embodiment using a bimetallic device according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0024] The invention relates to a bimetallic device sensitive to temperature variations. The invention has been developed for horological applications of auxiliary thermal compensation or mechanical temperature measurement. However, the bimetallic device can not be limited to applications in the watchmaking field.

The bimetallic device according to the invention comprises at least one first silicon-based blade and at least one second metal-based blade.

Said at least one first silicon-based blade may comprise monocrystalline silicon, doped monocrystalline silicon, polycrystalline silicon, doped polycrystalline silicon, porous silicon, silicon oxide, quartz, silica. , silicon nitride or silicon carbide. Of course, when the silicon-based material is in crystalline phase, any crystalline orientation can be used.

In addition, said at least one second metal-based blade may comprise silver and / or magnesium and / or lead and / or thallium and / or nickel and / or copper and / or zinc and / or gold and / or aluminum and / or indium and / or vulcanite.

According to the invention, said at least one first and at least one second blades are arranged to attach to one another so that the curvature of the bimetallic device varies as a function of temperature. Indeed, the band formed by said at least a first and at least a second blade bends with the increase in temperature on the side where the coefficient of expansion is the lowest.

In addition, this means in particular that the bimetallic device may comprise a plurality of first blades arranged to attach to a single second blade or, alternatively, that a plurality of second blades are arranged to attach to a single first blade.

Thus, for horological applications, it is sought a difference in expansion coefficient of the bimetallic device which is approximately between 10 and 10-6 K-1 and a low sensitivity to magnetic fields. As a preference, the monocrystalline silicon-nickel / phosphorus alloy pair is used.

Thus, the monocrystalline silicon has a coefficient of linear expansion a at 25 ° C around 2.5 10-6 K-1, whereas the metals or metal alloys generally comprise coefficients of linear expansion a at 25 ° C. between substantially 13 and 32 10-6 K-1. It is therefore understood that the difference in expansion coefficient of the bimetallic device allows a high sensitivity to temperature.

According to the invention, under ambient conditions of temperature and pressure (CATP) corresponding to a temperature of 25 ° C and a pressure of 100 kPa, the bimetallic device preferably forms a curved band.

A first example of bimetallic device 1 is illustrated in FIG. 1. The bimetallic device 1 comprises a first blade 3 based on silicon and a second blade 5 based on metal. As explained above, the strip 7 formed by said first and second blades 3, 5 bends with the increase in temperature on the side where the coefficient of expansion is the weakest, that is to say the first blade 3 based on silicon.

As illustrated in FIG. 1, said at least one first and at least one second blades 3, 5 are attached to one another by interlocking. Thus, one can see means 2, 2 ', 4 interlocking formed either by a set 4 groove - hook or sets 2, 2' notch - rib.

Of course, additionally or alternatively, said at least one first and at least one second blades could be attached to one another by use of an adhesion material or by electroforming.

More specifically, additionally or alternatively, the strip 7 could be made integral by gluing or brazing said first 3 and second 5 blades or the second blade 5 could be electroformed on the first blade 3.

As illustrated in FIG. 1, the bimetallic device 1 further comprises a one-piece fastening base 9 with one of said first 3 and second 5 blades for mounting the bimetallic device 1 on another part. In the example of FIG. 1, the fixing base 9 is shaped with the second metal-based blade 5 and has a through-hole 8 which can be tapped.

According to variants illustrated in FIGS. 2 and 3, the bimetallic device may comprise adjustable stop means for limiting the minimum and / or maximum variations in curvature of the bimetallic device. Indeed, it can be useful for the part on which the bimetallic device is attached to be able to limit the influence on only a certain temperature range, that is to say above a predefined temperature, below preset temperature or between two preset temperatures.

In FIG. 2, there can be seen two types of means 11, 13 of adjustable abutment for limiting the minimum and / or maximum curvature variations of the bimetallic device. Indeed, depending on the choice of materials for the blades 3, 5, it can be chosen to block the movement towards less curvature, towards more curvature of the band or both. The first adjustable abutment means 11 thus comprises a threaded cylindrical abutment 12 intended to block the movement of the strip by contact with the first blade 3 while the second adjustable abutment means 13 comprise an abutment 14 in the shape of an L, comprising a part vertically threaded, and intended to block the movement of the strip by contact with the second blade 5.

[0040] Alternatively, in FIG. 3, there can be seen two types of means 15, 17 adjustable stop to limit the minimum and / or maximum curvature variations of the bimetallic device. Indeed, depending on the choice of materials for the blades 3, 5, it can be chosen to block the movement towards less curvature, towards more curvature of the band or both. The first adjustable stop means 15 thus comprises a threaded cylindrical stop 16 intended to block the displacement of the strip by contact with a part facing the first blade 3 while the second adjustable stop means 17 comprises a threaded cylindrical stop 18 intended to to block the displacement of the strip by contact with a part facing the second blade 5.

According to a third variant illustrated in FIG. 4, the bimetallic device may also comprise a block 6 which may be in one piece with the end of one of said at least one first and at least one second blades 3, 5 in order to increase the influence of the bimetallic device. Indeed, it may be useful for the part to which the bimetallic device is attached to be able to increase the influence by modifying the center of mass of the bimetallic device.

Alternatively, the block 6 could be a flyweight fixed on the end of one of said at least one first and at least one second blades 3, 5 in the manner of the first and second adjustable means 15, 17 of abutment. The flyweight could thus be formed from a third material, for example denser than said at least one first and at least one second blades 3, 5.

A first embodiment of the invention relates to a compensating balance comprising at least one bimetallic device according to one of the preceding variants. It is therefore understood that the bimetallic device according to the invention can be advantageously used to provide an auxiliary or main heat compensation at the balance to a resonator comprising a compensating spiral or not.

According to a first alternative illustrated in FIG. 5, the compensating rocker 21 comprises a cut serge 23 formed by two bimetallic devices 25, 27 formed respectively by at least a first and at least a second blades 28, 28 ', 26, 26'. Each bimetallic device 25, 27 is connected by at least one arm 22 to a central opening 24 in order to modify the inertia of the balance 21 as a function of temperature. We see in fig. 5, that the second blades 26 and / or 26 'and / or said at least one arm 22 and / or the opening 24 can be monoblock. It can also be seen that weights 29, 29 'are used to adjust the inertia of the compensating balance 21.

It is therefore understood that the bimetallic devices 25, 27 according to the invention are advantageously used to provide an auxiliary or main heat compensation at the balance to a resonator comprising a compensating hairspring or not. It is also understood that, depending on the thermal compensation to be provided, the materials and the geometries used bimetallic device 25, 27 and, optionally, the block / feeder 6 and / or the fixing base 9 and / or means 11, 13, 15, 17 abutment, will be chosen to adjust the most precise movement of the watch movement. It is also possible to adjust the position of the bimetallic device 25, 27, that is to say its fixing position relative to the opening 24 as well as the angle that it forms relative to the arm 22, to optimize its use.

Of course, several bimetallic devices 25, 27 may be distributed on the same portion of the cut serge 23 or at said at least one arm 22. It is also possible, similarly to the example of FIG. 8, that the bimetallic device 25, 27 used comprises several first blades arranged to attach to a single second blade or, alternatively, that a plurality of second blades are arranged to attach to a single first blade.

According to a second alternative illustrated in FIGS. 6 to 8, the compensating rocker 31,41,51 comprises an uncut serge 33 connected by at least one arm 32 to a central opening 34. In addition, said at least one bimetallic device 35,45,55 is mounted on the serge 33 in order to modify the inertia of the compensating balance 31, 31, 51 as a function of temperature.

Depending on the choice of materials for the first and second blades, it may be chosen to fix the bimetallic device on the inner diameter of the serge as shown in FIG. 6, fix the bimetallic device on the inner outside diameter of the serge as shown in fig. 7 and 8 or both.

In the example of FIG. 7, the bimetallic device 45 comprises a band formed by a single first blade and a single second blade and which is attached to the outer diameter of the serge 33. Of course, several bimetallic devices 45 may be distributed over the external diameter of the serge 33.

It is also possible, as shown in FIG. 8, that the bimetallic device 55 mounted on the outer diameter of the serge 33 has a plurality of first blades arranged to attach to a single second blade or, alternatively, that a plurality of second blades are arranged to attach to a single first blade.

It is therefore understood that the bimetallic devices 45, 55 according to the invention are advantageously used to provide an auxiliary heat compensation at the balance to a resonator comprising a compensating hairspring. It is understood that, depending on the auxiliary compensation to be provided, the materials and the geometries used bimetallic device 45, 55 and, optionally, the block / feeder 6 and / or the fixing base 9 and / or means 11, 13, 15, 17 abutment, will be chosen to adjust the most precise movement of the watch movement. It is also possible to adjust the position of the bimetallic device 45, 55 on the serge 33 to optimize its influence.

In the example of FIG. 6, the bimetallic device 35 comprises a band formed by a single first blade and a single second blade and which is attached to the internal diameter of the serge 33. Of course, several bimetallic devices 35 may be distributed over the inner diameter of the serge 33.

It is also possible, similarly to the example of FIG. 8, that the bimetallic device mounted on the inner diameter of the serge 33 has a plurality of first blades arranged to attach to a single second blade or, alternatively, that a plurality of second blades are arranged to attach to a single first blade.

It is therefore understood that the bimetallic devices 35 according to the invention are advantageously used to provide an auxiliary heat compensation at the balance to a resonator comprising a compensating hairspring. It is understood that, depending on the auxiliary compensation to be provided, the materials and the geometries used bimetallic device 35 and, optionally, the block / feeder 6 and / or the fixing base 9 and / or means 11, 13, 15, 17 abutment, will be chosen to adjust the most precise movement of the watch movement. It is also possible to adjust the position of the bimetallic device 35 on the serge 33 to optimize its influence.

According to a third alternative illustrated in FIG. 9, the compensating rocker 61 comprises an uncut serge 63 connected by at least one arm 62 to a central opening 64. In addition, said at least one bimetallic device 65 is mounted on said at least one arm 62 in order to modify the inertia compensating balance 61 depending on the temperature.

In the alternative of FIG. 9, the bimetallic device 65 comprises a band with a cantilever block, the band being formed by a single first blade and a single second blade and which is attached to the upper surface of one of the arms 62 to the using one of the holes 66 formed on the arms 62. Of course, several bimetallic devices 35 may be distributed on the upper and / or lower surface of one or more of the arms 62 by means of one or more of the holes 66.

It is also possible, similarly to the example of FIG. 8, that the bimetallic device mounted on the upper surface of one of the arms 62 has a plurality of first blades arranged to attach to a single second blade or, alternatively, that a plurality of second blades are arranged to attach to a single first blade .

It is therefore understood that the bimetallic devices 65 according to the invention are advantageously used to provide an auxiliary heat compensation at the balance to a resonator comprising a compensating hairspring. It is understood that, depending on the auxiliary compensation to be provided, the materials and the geometries used bimetallic device 65 and, optionally, the block 6 and / or the base 9 and / or fixing means 11, 13, 15, 17 of stop, will be chosen to adjust the most precise movement of the watch movement. It is also possible to adjust the position of the bimetallic device 65 on each arm 62, that is to say its fixing position between the opening 64 and the serge 63 as well as the positioning with respect to the length of the arm 62, that is to say the angle between the beginning of the bimetallic strip 65 and the length of the arm 62 or the direction of the curvature of the bimetal (substantially parallel to the curvature of the serge 63 or inverted curvature), to optimize its influence .

According to a second embodiment, the invention relates to a compensating racket 71, 91 comprising at least one bimetallic device 75, 95 according to one of the preceding variants.

Therefore, the bimetallic device 75, 95 according to the invention can be advantageously used to provide an auxiliary heat compensation to a resonator by the raquetry with a very high accuracy.

Indeed, the racket is used to change the diurnal walk of the watch, by lengthening or shortening the active length of the spiral of a balance spring-spiral resonator. The racket is usually adjusted to rub on the cockroach. The diurnal march of the watch is changed by turning the racket. To simplify the adjustment, graduations are generally marked on the cock allow to estimate approximately the effect of retouching.

According to a first alternative illustrated in FIG. 10, the compensating rack 71 has a gap i arranged to receive a spiral spring formed in an arm 72. The arm 72 is rotatably mounted relative to an opening 74 and connected to said at least one bimetal device 75 to change the position. of the gap i, that is to say the haphazard of the hairspring, as a function of the temperature.

More specifically, the bimetallic device 75 comprises a concentrically extending U-shaped band which is formed by a single first blade and a single second blade. The bimetallic device 75 is mounted between the arm 72 supporting two pins 76, or alternatively a racket key, forming the gap i and an attachment ring 77 to the cockpit. As shown in fig. 10, one end 78 of the strip is pivotally mounted on the arm 72 to force the latter to move during temperature changes.

It is therefore understood that the arm 72 and / or the pins 76 and / or a portion of the strip of the bimetallic device 75 and / or the opening 74 and / or the fixing ring 77 may be in one piece.

Of course, several bimetallic devices 75 may be distributed between the arm 72 and the fixing ring 77, that is to say, for example, one between the opening 74 and the beginning of the pins 76 and a between the opening 74 and the fixing ring 77. It is also possible, similarly to the example of FIG. 8, that the bimetallic device 75 used has several first blades arranged to attach to a single second blade or, alternatively, that a plurality of second blades are arranged to attach to a single first blade.

It is therefore understood that the bimetallic devices 75 according to the invention are advantageously used to provide an auxiliary heat compensation at the level of the racket to a resonator comprising a compensating hairspring. It is understood that, depending on the auxiliary compensation to be provided, the materials and the geometries used bimetallic device 75 and, optionally, the block / feeder 6 and / or the fixing base 9 and / or means 11, 13, 15, 17 abutment, will be chosen to adjust the most precise movement of the watch movement. It is also possible to adjust the position of the bimetallic device 75 to optimize its influence.

According to a second alternative illustrated in FIG. 11, the compensating rack 91 has a gap i arranged to receive a spiral spring formed in an arm 92. The arm 92 is preferably mounted to rotate relative to an opening 94. In addition, the size of the gap i is advantageously controlled by said at least one bimetallic device 95 to change the gap i as a function of temperature.

More specifically, the bimetallic device 95 comprises a U-shaped band which is formed by a single first blade and a single second blade. The bimetallic device 95 is mounted on the arm 92 at 93 of these ends and has a first pin 96 at its other end. A second pin 96 is mounted on the arm 92 opposite the first pin to form the gap i and a racquet tail 97 is mounted opposite the arm 92 relative to the opening to allow adjustment of the racket 91.

It is therefore understood that the arm 92 and / or the pins 96 and / or a portion of the strip of the bimetallic device 95 and / or the opening 94 and / or the racket tail 97 may be monobloc.

Of course, several bimetallic devices 95 may be distributed between the arm 92 and the racquet tail 97, that is to say, for example, to include a second between the opening 94 and the beginning of the pins 96. It is also possible, similarly to the example of FIG. 8, that the bimetallic device 95 used has several first blades arranged to attach to a single second blade or, alternatively, that a plurality of second blades are arranged to attach to a single first blade.

It is therefore understood that the bimetallic devices 95 according to the invention are advantageously used to provide an auxiliary heat compensation at the racket to a resonator comprising a compensating hairspring. It is understood that, depending on the auxiliary compensation to be provided, the materials and the geometries used bimetallic device 95 and, optionally, the block / feeder 6 and / or the base 9 and / or fixing means 11, 13, 15, 17 abutment, will be chosen to adjust the most precise movement of the watch movement. It is also possible to adjust the position of the bimetallic device 95 to optimize its influence.

It is also conceivable that a bimetallic device of the type illustrated in FIG. It can be adapted not to change the position of a racket pin but the position of the stud point of a hairspring depending on the temperature. It is then understood that the bimetallic device would be mounted between a fixed point of the watch movement, like a bridge, and the outer curve of a hairspring so that the active length of the hairspring can be modified as a function of the temperature without having to use a racket .

According to a third embodiment illustrated in FIG. 12, the invention relates to a temperature sensor 81 comprising at least one bimetallic device 85 according to one of the preceding variants.

Therefore, the bimetallic device 85 according to the invention can be advantageously used to measure the temperature with very high accuracy.

In the example of FIG. 11, the temperature sensor 81 may thus comprise a display 83 and an elastic device 87 for tracking the movement of the at least one bimetallic device in order to modify the position of the display 83 as a function of the temperature.

Specifically, the bimetallic device 85 comprises a strip formed by a single first blade and a single second blade and which is mounted to be in permanent contact with a sensor 80 of the elastic device 87 displacement tracking. As shown in fig. 11, the feeler 80 is integral with a pivot 82 intended to create a rotational movement B from the movements A of the bimetallic device 85. The pivot 82 communicates its movement B to the return 84 pivotally mounted according to the rotation C via the spring 86 to force the probe 80 to always follow the surface of the bimetallic device 85. As shown in FIG. 11, the reference 84 meshes with the pinion 88 of the display in order to move the temperature display according to the rotation D, for example with a needle.

Of course, several bimetallic devices 85 could be used to display an average temperature value via a differential. It is also possible, similarly to the example of FIG. 8, that the bimetallic device 85 used has a plurality of first blades arranged to attach to a single second blade or, alternatively, that a plurality of second blades are arranged to attach to a single first blade.

It is therefore understood that the bimetallic devices 85 according to the invention are advantageously used to provide a measurement accuracy of the temperature. It is understood that, depending on the accuracy of the measurement to be made, the materials and the geometries used bimetallic device 85 and, optionally, the block 6 and / or the base 9 and / or fixing means 11, 13, 15, 17 stop, will be chosen to adjust more precisely the operation of the temperature sensor. It is also possible to adjust the position of the bimetallic device 85 to optimize its use.

Of course, the present invention is not limited to the example shown but is susceptible of various variations and modifications that will occur to those skilled in the art. In particular, more and more organs of a timepiece are made of silicon. In fact, any silicon-based member could be modified during manufacture to integrate a bimetallic device according to the invention such as, for example, the hairspring or the escapement.

Thus, by way of example, according to a fourth embodiment, the invention relates to a compensating hairspring comprising at least one bimetallic device. Indeed, the bimetallic device according to the invention can be advantageously used to provide an auxiliary thermal compensation to a resonator at the point of pitonnage with a very high accuracy.

More specifically, the compensating balance spring could thus comprise an outer turn connected, in a monobloc manner or not, to said at least one bimetallic device arranged to be fixed to a bridge in order to modify the active length of the compensating balance spring as a function of the temperature. .

Claims (23)

claims A bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) having at least a first silicon-based blade and at least one second metal-based blade characterized in that said at least one first and at least one second blades (3, 5, 26, 26 ', 28, 28') are arranged to attach to one another so that the curvature of the bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) varies with temperature. 2. bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) according to the preceding claim, characterized in that said at least one first silicon-based blade comprises monocrystalline silicon, doped monocrystalline silicon, polycrystalline silicon, doped polycrystalline silicon, porous silicon, silicon oxide, quartz, silica, silicon nitride or silicon carbide. 3. bimetallic device (1.25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of the preceding claims, characterized in that said at least one second metal-based blade comprises silver, magnesium, lead, thallium, nickel, copper, zinc, gold, aluminum or indium or vulcanite. Bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of the preceding claims, characterized in that, under the ambient conditions of temperature and pressure, the device bimetallic strip (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) forms a curved strip (7). 5. 5. Bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of the preceding claims, characterized in that said at least one first and at least one second blades (3, 5, 26, 26 ', 28, 28') are attached to one another by interlocking. 6. Bimetallic device (1.25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of the preceding claims, characterized in that said at least one first and at least one second blades (3 , 5, 26, 26 ', 28, 28') are attached to each other by use of an adhesion material. 7. bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of claims 1 to 4, characterized in that said at least one second blade is electroformed on said at less a first blade. Bimetallic device (1,25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of the preceding claims, characterized in that the bimetallic device (1, 25, 27, 35, 45 , 55, 65, 75, 85, 95) comprises a base (9) integral with one of said at least one first and at least one second blades (3, 5, 26, 26 ', 28, 28'). for mounting the bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) on a workpiece. Bimetallic device (1,25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of the preceding claims, characterized in that the bimetallic device (1, 25, 27, 35, 45 , 55, 65, 75, 85, 95) comprises a block (6) integral with the end of one of said at least one first and at least one second blades (3, 5, 26, 26 ', 28, 28' ) to increase the influence of the bimetallic device (1.25, 27, 35, 45, 55, 65, 75, 85, 95). Bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of the preceding claims, characterized in that the bimetallic device (1, 25, 27, 35, 45 , 55, 65, 75, 85, 95) comprises adjustable stop means (11, 13, 15, 17) for limiting the minimum and / or maximum curvature variations of the bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95). Bimetallic device (1,25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of the preceding claims, characterized in that the bimetallic device (1, 25, 27, 35, 45 , 55, 65, 75, 85, 95) comprises a plurality of first blades arranged to attach to a single second blade. Bimetal device (1,25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of claims 1 to 10, characterized in that the bimetallic device (1,25, 27, 35 , 45, 55, 65, 75, 85, 95) comprises a plurality of second blades arranged to attach to a single first blade. Balance compensator (21,31,41,51, 61) comprising at least one bimetallic device (1,25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of the preceding claims. Balance compensator (21, 31, 41, 51, 61) according to the preceding claim, characterized in that the compensating balance (21, 31, 41, 51, 61) comprises a cut serge (23) formed by at least two bimetallic devices (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) each connected by at least one arm (22) to a central opening (24) to modify the inertia of the compensating balance ( 21,31,41,51,61) as a function of temperature. Balance compensator (21, 31, 41, 51, 61) according to claim 13, characterized in that the compensating balance (21, 31, 41, 51, 61) comprises an uncut serge (33) connected by at least one an arm (32) at a central opening (34) and in that said at least one bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) is mounted on the serge (33). ) in order to modify the inertia of the compensating balance (21, 31, 41, 51, 61) as a function of temperature. Balancer compensator (21,31,41,51,61) according to claim 13, characterized in that the compensating balance (21,31,41,51,61) comprises a serge (33) uncut connected by at least an arm (32) at a central opening (34) and in that said at least one bimetallic device (1.25, 27, 35, 45, 55, 65, 75, 85, 95) is mounted on said at least one arm (32) to modify the inertia of the compensating balance (21,31,41, 51,61) as a function of the temperature. Compensatory racket (71, 91) comprising at least one bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of claims 1 to 12. 18. Compensating racket (71,91) according to the preceding claim, characterized in that the compensating racket (71, 91) has a gap (/) arranged to receive a spiral spring and connected to said at least one bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) to change the position of the gap (i) as a function of temperature. 19. Compensating racket (71, 91) according to claim 17, characterized in that the compensating racket (71, 91) comprises a gap (i) arranged to receive a spiral spring, the size of the gap (i ) being controlled by said at least one bimetallic device (1.25, 27, 35, 45, 55, 65, 75, 85, 95) to modify the gap (i) as a function of temperature. 20. Temperature sensor comprising at least one bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of claims 1 to 12. 21. Temperature sensor (81) according to the preceding claim characterized in that the temperature sensor (81) comprises a display (83) and an elastic tracking device (87) of said at least one bimetallic device (1.25). , 27, 35, 45, 55, 65, 75, 85, 95) to change the position of the display (83) as a function of temperature. 22. Compensating spiral comprising at least one bimetallic device (1.25, 27, 35, 45, 55, 65, 75, 85, 95) according to one of claims 1 to 12. 23. Compensating spiral according to the preceding claim, characterized in that the outer turn of the compensating balance spring is connected to said at least one bimetallic device (1, 25, 27, 35, 45, 55, 65, 75, 85, 95) arranged to be fixed to a bridge in order to modify the active length of the compensating hairspring as a function of the temperature.