Balance-spring piezoelectric resonator, in particular for timepiece rotary motor

Abstract

To provide a piezoelectric resonator which can resist high electromagnetic fields while keeping the energy consumption and volume reduced.SOLUTION: A piezoelectric resonator, in particular for a rotary piezoelectric motor, includes a stationary base 3 and an oscillating mass 2 extending about a longitudinal axis. The oscillating mass is provided with at least one inertia-block 4, preferably two opposing inertia-blocks. The piezoelectric resonator includes a flexible blade guide connecting the oscillating mass to the base, so that the oscillating mass can be oscillated about a center of rotation in a pendulum movement. The flexible blade guide includes: a first flexible blade 6 connected to the base and / or to the oscillating mass to allow the displacement of the oscillating mass relative to the base; and a spiral spring 5 connected to the base and / or to the oscillating mass. The spiral spring includes at least partially an electrically actuatable piezoelectric material to thereby deform the spiral spring and oscillate the oscillating mass.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of piezoelectric resonators, in particular for rotary piezoelectric motors. The present invention further relates to the technical field of timepieces equipped with such rotary piezoelectric motors. [Background technology]

[0002] Electric motors commonly used in the manufacture of portable timepieces (e.g., wristwatches, pocket watches) are: This is a "Lavet" type rotary motor that operates on electromagnetic physical principles. The motor generally consists of a stator with a coil and a phase-shift actuation of the coil. and a magnetized rotor that rotates.

[0003] However, such motors have limited resistance to high magnetic fields. Generally, a magnetic field greater than 2 mT will cause the motor to stop. The tar stops.

[0004] Therefore, to avoid this problem, it is necessary to design a motor that operates on other physical principles. There is a need.

[0005] For example, electrostatic combs, as described in Swiss Patent CH709512, are used. However, the comb part takes up space and is more difficult to rotate than the "Lavet" type motor. It consumes a lot of energy.

[0006] Motors based on the piezoelectric effect have also been developed, for example in European patent EP 0 587 031. However, this is limited to actuating the date and consumes a lot of power. This is usually the second most energy-intensive due to the risk of premature wear. I can't move the needle. Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention provides a device that can withstand high electromagnetic fields while maintaining low power consumption and volume. The object is to provide a piezoelectric resonator, particularly for a rotary piezoelectric motor. [Means for solving the problem]

[0008] To this end, the present invention relates to a piezoelectric resonator, in particular for rotary piezoelectric motors, said resonator The vibrator includes a fixed base and a vibration weight extending about a longitudinal axis, the vibration weight The system includes at least one inertial block, preferably two inertial blocks on opposite sides. be.

[0009] The piezoelectric resonator includes a flexible blade guide that connects the vibration mass to the base. This allows the vibration weight to oscillate around the center of rotation in a pendulum-like manner. The flexible blade guide can be connected to the base and / or the vibration weight. at least one first flexible blade attached to said base; The flexible blade guide allows the vibration mass to be displaced relative to the The vibration device further comprises a helical spring connected to the base and / or the vibration weight, and the helical spring has at least At least in part, there is an electrically actuable piezoelectric material, which allows The present invention is revolutionary in that the vibration weight is vibrated by deforming the coil spring.

[0010] Such a resonator configuration can provide efficient motion. By actuating the piezoelectric material in the spring, the helical spring can contract and expand. Thanks to the flexible blades of the flexible guide, it can rotate around the center of rotation. The vibration mass vibrates due to the vibration. In this way, the flexible blade is actuated by Since only a small amount of energy is required, the resonator consumes very little energy and The vibration weight is subjected to vibration motion.

[0011] Therefore, depending on the field of application of the piezoelectric resonator, it can be applied to other mechanical components, e.g. the gears of motors. Vibration motion can be transmitted to the

[0012] In certain embodiments of the invention, the flexible guide supports the vibration weight on the base. a second flexible blade connected to the first flexible blade; The base is connected to the seismic mass.

[0013] In certain embodiments of the present invention, the first flexible blade and the second flexible blade The oscillating blades are not intersecting and extend from the center of the vibration weight to the eccentric portion of the base. It extends to.

[0014] In certain embodiments of the present invention, the first flexible blade and the second flexible blade The angle of the flex blade is in the range of 30° to 150°, preferably in the range of 60° to 130°. More preferably, the angle is in the range of 90° to 120°.

[0015] In certain embodiments of the invention, the helical spring is connected to the oscillating weight, This actuates the vibration.

[0016] In a particular embodiment of the invention, the flexible guide includes two RCC type a flexible pivot, the flexible guide including an intermediate movable element and the first movable element; The flexible blade and the second flexible blade are connected to the base and the intermediate movable blade. a first pair of flexible blades connecting the intermediate movable element to the vibration weight; and a second pair of flexible blades connected to the first pair.

[0017] In certain embodiments of the present invention, the first flexible blade and the second flexible blade The movable blades are not crossed and move from the intermediate movable element to the base. and move away from each other.

[0018] In certain embodiments of the present invention, the first flexible blade and the second flexible blade The angle of the axial blade is in the range of 30° to 100°, preferably in the range of 40° to 80°. forms an angle.

[0019] In certain embodiments of the present invention, the first flexible blade and the second flexible blade The axially symmetrical blades are arranged.

[0020] In certain embodiments of the invention, the helical spring is connected to the intermediate element and the base. The helical spring is connected to the intermediate movable element, and when actuated, the helical spring vibrates the intermediate movable element. To make.

[0021] In certain embodiments of the invention, the helical spring is and the second pair of flexible blades.

[0022] In certain embodiments of the present invention, the helical spring and the first pair of flexible brakes The cord forms an angle in the range of 60° to 120°, preferably in the range of 80° to 100°. It is configured to achieve this.

[0023] In certain embodiments of the present invention, the helical spring and the second pair of flexible brakes The blades form an angle in the range of 20° to 60°, preferably in the range of 30° to 45°. It is structured so that

[0024] In a particular embodiment of the invention, the flexible guide includes two RCC type a flexible pivot, the flexible guide including an intermediate movable element and the first movable element; a pair of flexible blades, each of which has a flexible blade of The blade connects the intermediate movable element to the oscillating weight, and the helical spring connects the base. The flexible guide connects the base to the intermediate movable element. a second helical spring connected to the second helical spring, the second helical spring being electrically actuated; a piezoelectric material that can be deformed to deform the second helical spring and generate the vibration Vibrate the weight.

[0025] In certain embodiments of the present invention, the first and second helical springs are 11° to 160°, preferably 100° to 140°, and more preferably 11° to 160°. It is configured to form an angle within the range of 0° to 130°.

[0026] In certain embodiments of the present invention, the first helical spring and the second helical spring are They are configured to be axially symmetrical to each other.

[0027] In certain embodiments of the present invention, the piezoelectric resonators are arranged substantially in the same plane. do.

[0028] In a particular embodiment of the present invention, the piezoelectric resonator is configured to oscillate the mass at a specific frequency. It is configured to vibrate at a certain frequency.

[0029] In a particular embodiment of the invention, the piezoelectric resonator is preferably, in large part, Low conductivity materials such as silicon, glass, ceramics, and metals, and MEMS-type photolithography It is a non-magnetic single crystal or includes polycrystalline material compositions.

[0030] In a particular embodiment of the invention, the flexible guide is made in one piece.

[0031] The present invention further provides a display device, in particular for a timepiece, comprising a piezoelectric resonator as described above. This relates to piezoelectric motors.

[0032] In a particular embodiment of the invention, the piezoelectric motor is preferably two-jawed, The piezoelectric resonator includes at least one claw and a movable wheel, and the claw is attached to the vibration weight of the piezoelectric resonator. and a second vibration damper attached to the movable wheel, which rotates the movable wheel in a first direction when the vibration damper vibrates. To make.

[0033] The present invention further provides a gear transformer configured to rotate at least one needle. The gear transmission is configured to actuate the gear transmission. The present invention relates to a timepiece having a timepiece movement equipped with the above-mentioned piezoelectric motor.

[0034] The following description, given by way of illustration and not limitation, is given with reference to the accompanying drawings, in which: Other features and advantages will become apparent upon reading the following description. [Brief explanation of the drawings]

[0035] [Figure 1] 1 is a schematic perspective view from above of a first embodiment of a piezoelectric resonator according to the invention, in particular for a rotary motor; [Figure 2] 1 is a schematic perspective view from above of a second embodiment of a piezoelectric resonator according to the invention, in particular for a rotary motor; [Figure 3] 3 shows a schematic view from above of a third embodiment of a piezoelectric resonator according to the invention, in particular for a rotary motor; FIG. [Figure 4] FIG. 1 is a schematic perspective view of a rotary piezoelectric motor including the resonator as seen from above. DETAILED DESCRIPTION OF THE INVENTION

[0036] 1 to 3 show piezoelectric resonators according to different embodiments, which are used in particular in rotary motors. In particular, motors are used in timepieces to generate the time signals placed on the dial. The indicator device may include a needle configured to be actuated by a piezoelectric The resonators 1, 10, 20 preferably extend substantially in one plane.

[0037] In FIG. 1, the piezoelectric resonator 1 according to the first embodiment has a substantially triangular shape. There is a base 3, which is shaped like a square.

[0038] The resonator 1 also comprises a oscillating mass 2, which is here M-shaped. The main arms extend at both ends to the opposite sides of the base 13, and are essentially Two inertia blocks 4 are arranged in a substantially straight line.

[0039] The base 3 is arranged on the M-shape. The vibration mass 2 and the base 3 are preferably on the same plane. is placed in the plane.

[0040] The resonator comprises a flexible blade guide connecting the vibration mass 2 to the base 3, Therefore, the vibration weight 2 can be oscillated around the center of rotation in a pendulum-like manner. This center of rotation is substantially the center of the vibration weight 2, i.e., the center of the arm, preferably the vibration weight Located at the center of gravity of 2.

[0041] The flexible guide has two flexible blades. The first flexible blade The blade 6 and the second flexible blade 7 are attached to the vibration weight, which is located at the apex of the inner part of the M-shape. 2 are connected to the same central part and are RCC (Remote Center Compliance) Forms the pivot of the group.

[0042] The first flexible blade 6 and the second flexible blade 7 are It is connected to two eccentric parts on opposite sides, in this case the corners of a rectangle.

[0043] The first flexible blade 6 and the second flexible blade 7 do not intersect, It extends from the inside of the vibration weight 2 to the base 3 .

[0044] The first flexible blade 6 and the second flexible blade 7 have three Within the range of 0° to 150°, preferably within the range of 60° to 130°, and more preferably within the range of 90° The angle is configured to form a non-zero angle, that is, an angle in the range of 0° to 120°.

[0045] According to the invention, the flexible blade guide further comprises a helix connected to the oscillating weight 2. The spiral spring 5 is disposed on the opposite side of the M-shape from the base 3. .

[0046] The spiral spring 5 has several elastic coils. The spiral spring 5 has a fixed block. The inner end is connected to the mustard and the substantially straight section is connected to the intermediate movable element 8. There is an outer edge that continues.

[0047] The helical spring 5 comprises, at least in part, an electrically actuatable piezoelectric material. This deforms the spiral spring 5 and vibrates the vibration weight 2. , preferably arranged along the entire length of the spiral spring 5. The spiral spring 5 may include, for example, two It comprises a layer of piezoelectric material sandwiched between two electrode layers.

[0048] These electrode layers may be monocrystalline or polycrystalline silicon, such as quartz, glass, or metal. , disposed on an integral structural support material.

[0049] The Bromstad 9 has a fixed coil to actuate the blades. , an electric current source connected to the electrode layer to receive a voltage and actuate the piezoelectric layer of the spiral spring 5; There is a connection.

[0050] The piezoelectric layer is preferably made of a crystalline or polycrystalline material, such as a solid ceramic ( Sodium potassium niobate) or PZT type ceramics (lead titanium zirconate) (In the case of tan)

[0051] This activation is caused by an AC voltage. By electrically activating a layer of piezoelectric material, Thus, the helical spring 5 alternately contracts and expands around its center, and the intermediate element The vibration mass 2 is rotated and displaced via the vibration sensor 8. This vibration occurs at a specific frequency, preferably at a resonant frequency. It occurs at the resonant frequency of the device.

[0052] The piezoelectric layer disposed over the entire surface of the helical spring 5 is a simple and flexible layer occupying the same space. This significantly increases the efficiency of the actuator compared to a swivel or straight blade.

[0053] The oscillating weight 2 is attached to two flexible guides that form an RCC type pivot. The movement is guided by bull blades 6 and 7, and the pendulum moves around the center of rotation. Therefore, the vibration mass 2 vibrates, and the two inertial blocks 4 vibrate at a specific frequency, preferably The vibration mass 2 is displaced laterally at the center of the intermediate movable element 8. The vibration is centered around the center of rotation located at .

[0054] In the second embodiment of FIG. 2, the piezoelectric resonator 10 has a substantially triangular center. Two curved sections 21 are arranged on either side of the central section 23 and extend to the vibration weight 12. , there is 22, there is base 13.

[0055] The resonator 10 also includes a vibration mass 12. The vibration mass 12 has a main arm and both of its ends. At the end, two inertia blocks 14 are arranged, which extend on either side of the base 13. The arms are arranged tangentially to the vertices of the triangle. The vibration mass 1 is substantially curved in the central region to provide space for the vibration mass 1. 2 and base 13 are preferably arranged in the same plane.

[0056] The resonator comprises a flexible blade guide connecting the seismic mass 12 to the base 13, This allows the vibration weight 12 to oscillate around the center of rotation in a pendulum-like manner. Cut.

[0057] The flexible guide has a first RCC type pivot. Such a pivot The intermediate movable element 8 and a first pair of flexible blocks connecting the base to the intermediate movable element 8 are included. The intermediate movable element is connected to the oscillating mass 12 by a second RCC type pivot. and a second pair of flexible blades forming a

[0058] The intermediate movable element 8 is a point element, and is smaller in size than the base 8 and the vibration weight 12 . This point element 8 is, for example, cylindrical in shape. Preferably, the intermediate movable element 8 is substantially The center of rotation is located in the center.

[0059] The first pair of flexible blades is a first flange connecting the base 13 to the intermediate movable element 8. The first flexible blade 16 and the second flexible blade 17 are preferably The flexible blade 16 and the second flexible blade 17 are substantially straight. do.

[0060] The first flexible blade 16 and the second flexible blade 17 do not cross each other. First, as one moves from the intermediate movable element 8 towards the same first curved portion 21 of the base 13, Move away from each other.

[0061] The first flexible blade 16 and the second flexible blade 17 are arranged at an angle of 30° to 10°. The angle is within the range of 0°, preferably within the range of 40° to 80°.

[0062] The second pair of flexible blades includes a third flexible blade 18 and an intermediate movable blade. Extending from element 8 to the vibration mass 2, more specifically to the top of the inertia block 14 below the arm. and a fourth flexible blade 19 located between the first and second pair of flexible blades. forms a second RCC type pivot.

[0063] Thus, the flexible blades 16, 17 of the first pair of flexible blades are The second pair of flexible blades extends on the opposite side of the flexible blades 18, 19. is doing.

[0064] The third flexible blade 18 and the fourth flexible blade 19 are 0°, preferably in the range of 60° to 130°, and more preferably in the range of 90° to 120° The angle is in the range of .degree.

[0065] According to the invention, the flexible guide further comprises a spiral guide according to the first embodiment of FIG. The helical spring 15 is substantially identical to spring 5 and includes a piezoelectric material.

[0066] The spiral spring 15 is located between the base 13 and the intermediate movable element 8, in particular the second bending of the base 13. The spiral spring 15 is further arranged in the curved portion 22 of the intermediate movable element 8. connected to each of the flexible blades by a straight section 33 connected to Furthermore, the inner end is connected to the base 13.

[0067] The helical spring 15 and the first pair of flexible blades 16, 17, in particular the second flexible blade The bull blade 17 has an angle of 60° to 120°, preferably 80° to 100°. The helical spring 5 and the second pair of flexible blades 18, 19 form an angle. In particular, the fourth flexible blade 19 has an angle in the range of 20° to 60°, preferably 30°. Forming an angle in the range of ~45°.

[0068] In this embodiment, the helical spring 15, when activated, acts on the intermediate movable element 8. The movement of the intermediate movable element 8 causes the first pair of flexible blades 16 , guided by 17.

[0069] The vibration of the intermediate movable element 8 is controlled by the second pair of flexible blades 18, 19. The force is transmitted to the moving weight 12.

[0070] In this way, the oscillating weight 12 is centered around the center of rotation, which is here configured at the center of the intermediate element 8. The two inertial blocks 14 vibrate at a specific frequency, preferably in the form of a resonator. It moves laterally at a natural frequency of 10.

[0071] The RCC type double pivot is supported by a second pair of flexible blades 18, 19. As a result, the amplitude of vibration of the vibration weight 12 can be increased.

[0072] The piezoelectric resonator 20 according to the third embodiment of FIG. 3 has a substantially triangular central portion. Two curved portions 21, 22 are arranged on either side of the vibration weight 12 and extend to the vibration weight 12. There is, there is base 13.

[0073] The vibration mass 12 of the piezoelectric resonator 20 has a main arm, and at both ends of the arm, there are Two inertia blocks 14 are arranged extending from the arms. The arms are substantially curved in the central region, thereby The vibration mass 12 and the base 13 are preferably on the same plane. is placed in the plane.

[0074] The piezoelectric resonator 20 is formed by a flexible blade guide 11 connecting the vibration mass 12 to the base 13. 6, 17, which rotate the vibration weight 12 around the center of rotation so that it moves in a pendulum motion. It can be made to vibrate.

[0075] The flexible guide has two RCC type pivots. The bull guide generally comprises an intermediate movable element 8 and a second movable element 9 connecting the intermediate movable element 8 to the oscillating weight 2. a pair of flexible blades 26, 27 and a second blade connecting the base 13 to the intermediate movable element 8; and two pairs of flexible blades.

[0076] In this embodiment, the second pair of flexible brakes of the second RCC type pivots The cord is replaced by a helical spring.

[0077] The intermediate movable element 8 is a point element and is smaller in size than the base 8 and the vibration weight 2. The point element 8 is, for example, cylindrical in shape. Preferably, the center of the intermediate movable element 8 is a rotating The center is located.

[0078] The first pair of flexible blades has a first connecting element 8 to the base 13. A flexible blade 26 and a second flexible blade connecting the base 13 to the intermediate movable element 8 There is a LeBlade 27.

[0079] The flexible guide comprises a first helical spring 5 and a second helical spring 25. The springs 5, 25 are arranged between the base 3 and the intermediate movable element 8, in particular at each curved portion of the base 3. 21 and 22 are arranged.

[0080] The intermediate movable element 8 furthermore has a straight section which connects each of the flexible blades. The inner end of each spiral spring is connected to the base 3. The first spiral spring 5 and the second spiral spring 25 are the flexible blades of the first pair. It extends on the opposite side to the bull blades 26 and 27 .

[0081] The first flexible blade 24 and the second flexible blade 25 are arranged at an angle of 80° to 16°. 0°, preferably in the range of 100° to 140°, and more preferably in the range of 110° to 1 The first spiral spring 24 and the second spiral spring 25 are configured to form an angle within a range of 30°. The spiral springs 25 are configured to be axially symmetrical to one another.

[0082] The first spiral spring 24 and the second spiral spring 25 are the same as the spiral springs according to the first and second embodiments. Both helical springs 24, 25 also comprise piezoelectric material.

[0083] In this embodiment, the two helical springs 5, 25 are preferably alternately arranged to actuate the actuator. They therefore act on the intermediate movable element 8 and cause it to vibrate. The rotational movement of the intermediate movable element 8 is therefore similar to that of an RCC type pin with straight blades. Like the bot, it is guided by spiral springs 24, 25.

[0084] The vibration of the intermediate movable element 8 is controlled by the second pair of flexible blades 26, 27. The force is transmitted to the moving weight 12.

[0085] In this way, the oscillating mass 2 is connected to the two flexible elements in each pair, which in this case are the intermediate elements 8. The two inertia blocks 14 vibrate around the center of rotation corresponding to the intersection of the two blades. , displaced laterally at a particular frequency.

[0086] The RCC type pivot is oscillated thanks to a second pair of flexible blades 9, 11. The amplitude of the vibration of the moving weight 2 is increased.

[0087] The resonators 1, 10, 20 according to the previously described embodiments are preferably, for the most part, This includes single or polycrystalline materials such as silicon, glass, ceramics, and metals.

[0088] The resonators 1, 10, 20 are, for example, optical lithography devices of the MEMS (microelectromechanical systems) type. The rigidity of the material is such that it can be obtained by a photolithography micromachining process. The elasticity and machining precision give the resonators 1, 10, 20 high resonance performance.

[0089] Also, due to the non-magnetic and low conductivity properties of some of these materials, large DC and Provides excellent resistance to alternating magnetic fields.

[0090] The resonators 1, 10, and 20 vibrate the vibration masses 2 and 12 at their natural frequencies. In this way, the angular travel of the vibration weight is increased. This reduces the energy consumption of the resonator.

[0091] FIG. 4 shows one embodiment of a rotary piezoelectric motor 30, particularly for a timepiece display device. The piezoelectric motor 30 is used to drive the hands of a timepiece, such as hands on the dial. The piezoelectric motor 30 can be used, among other things, to actuate a display device. , which can be actuated by rotating the mechanical gear transmission of the display device. It is configured to be able to do this.

[0092] The piezoelectric motor 30 is a piezoelectric resonator according to the invention, in this case the second embodiment shown in FIG. The piezoelectric resonator 10 according to the embodiment is also applicable to a piezoelectric motor. The piezoelectric resonator 10 can be used without changing its operation. The plate is attached by a base 13.

[0093] The piezoelectric motor 10 further includes a movable gear 51 and a rotor 52 that rotates the movable gear 51 in one direction. The movable wheel 51 preferably has two teeth. The peripheral teeth are preferably asymmetrical teeth, which determine the direction of rotation. The moveable wheel 51 is connected to a gear train to which the hands of the display device are attached.

[0094] The first claw 52 has a mechanism for rotating the movable wheel 51 in a first direction, for example, counterclockwise. The second claw 53 is capable of rotating when the first claw 52 rewinds onto the next tooth of the rotor 51. It holds the movable car 51.

[0095] Each pawl 52, 53 has a flexible tooth 55 at its end, preferably an asymmetric tooth. There is Luarm 54.

[0096] The first claw 52 is displaced, causing the movable wheel 51 to rotate. The first vibration is then applied to the resonator 10 via the vibration mass 12. The pawl 52 also vibrates, which causes the first The pawl 52 pushes or pulls the movable gear 51 in a first direction.

[0097] The second claw 53 is mounted on the plate, plate bridge, or directly on the base 30. This reduces positioning errors due to assembly tolerances. The second pawl 53 has a function of preventing the gear from rotating in the direction opposite to the first direction. The teeth 55 of the second pawl 53 cooperate with the asymmetric teeth to rotate the movable wheel 51 in the first direction. and prevents the movable wheel 51 from rotating in the opposite direction.

[0098] For this purpose, the flexible arms 54 of the claws 52, 53 are arranged so that the teeth 55 are aligned with the teeth of the movable 51. When engaged, the movable wheel 51 is in a relaxed, straight position and is in a first direction. When the tooth is rotated in the opposite direction and pushed outward by the dentition, it is curled up and bent. .

[0099] In the case of a watch, the resonant frequency or natural frequency of motor 1 is the rate of the movement. It is made to match the frequency of the crystal used to set the The excitation frequency is chosen to correspond to a submultiple of the crystal frequency, z, e.g., 128 Hz or The frequency of the motor 1 is preferably set so that its vibration amplitude is maximum. The excitation frequency is adjusted and tuned so that it does not fall below 90-95% of the large amplitude.

[0100] Optionally, the second pawl 53 may be used to determine the rotation distance or rotation speed of the movable wheel 51. For this purpose, the second claw 5 The three flexible arms 54 are provided with piezoelectric material which is connected to a counting unit. In this way, each time the second pawl 53 is bent, the counting unit counts up to one tooth. The rotation of the moving vehicle 51 is registered.

[0101] Without departing from the scope of the present invention as defined by the appended claims, Various modifications and / or improvements to the various embodiments of the present invention will be apparent to those skilled in the art. It will be appreciated that combinations can be made.

Claims

1. A piezoelectric resonator (10, 20) in particular for a rotary piezoelectric motor, The piezoelectric resonators (10, 20) include a rectangular fixed base (13) and a V-shaped vibrating weight (12) that extends along the longitudinal direction of the base and is spaced further apart in the center than the ends of the base in the longitudinal direction of the base. The vibrating weight (12) has at least one inertia block (14), The piezoelectric resonator includes a flexible blade guide that connects the vibrating weight (12) to the base (13), thereby allowing the vibrating weight (12) to vibrate around the center of rotation in a pendulum-like motion. The flexible blade guide comprises a first flexible blade (16, 26) and a second flexible blade (17, 27) connected to the base (13) and / or the vibrating weight (12), thereby enabling the vibrating weight (12) to be displaced relative to the base (13). The flexible blade guide includes spiral springs (15, 24) connected to the base (13), The helical springs (15, 24) have at least partially electrically actuable piezoelectric material, which deforms the helical springs (15, 24) and vibrates the vibrating weight (12). The flexible blade guide connects the base (13) to the intermediate movable element (8), or connects the intermediate movable element (8) to the vibrating weight (12). A piezoelectric resonator characterized by the following features.

2. The aforementioned flexible blade guide has two RCC (Remote Center Compliance) type flexible pivots, The flexible blade guide comprises an intermediate movable element (8), a first pair of flexible blades (16, 17) having a first flexible blade (16) and a second flexible blade (17) that connect the base (13) to the intermediate movable element (8), and a second pair of flexible blades (18, 19) that connect the intermediate movable element (8) to the vibrating weight (12). The piezoelectric resonator according to feature 1.

3. The first flexible blade (6) and the second flexible blade (7) do not intersect, and move away from each other as you move from the intermediate movable element (8) to the eccentric portion of the base (13). The piezoelectric resonator according to feature 2.

4. The first flexible blade (16) and the second flexible blade (17) form an angle within the range of 30° to 100°. The piezoelectric resonator according to feature 2.

5. The first flexible blade (16) and the second flexible blade (17) are arranged axially symmetrically with respect to each other. The piezoelectric resonator according to feature 2.

6. The helical spring (5) is connected to the intermediate movable element (8) and the base (13), The helical spring (5) vibrates the intermediate movable element (8) when actuated. The piezoelectric resonator according to feature 2.

7. The helical spring (5) is positioned between the first pair of flexible blades (16, 17) and the second pair of flexible blades (18, 19). The piezoelectric resonator according to feature 6.

8. The helical spring (5) and the first pair of flexible blades (16, 17) are arranged to form an angle in the range of 60° to 120°. The piezoelectric resonator according to feature 6.

9. The helical spring (5) and the second pair of flexible blades (18, 19) are arranged to form an angle in the range of 20° to 60°. The piezoelectric resonator according to feature 6.

10. The aforementioned flexible blade guide has two RCC (Remote Center Compliance) type flexible pivots, The flexible blade guide comprises an intermediate movable element (8) and a pair of flexible blades (26, 27) having a first flexible blade (26) and a second flexible blade (27). The pair of flexible blades (26, 27) connect the intermediate movable element (8) to the vibrating weight (12), The aforementioned helical spring (24) is a first helical spring, and the first helical spring connects the base (23) to the intermediate movable element (8), The flexible blade guide includes a second helical spring (25) that connects the base (23) to the intermediate movable element (8), The second helical spring (25) contains an electrically actuable piezoelectric material, which deforms the second helical spring (25) and causes the vibrating weight (12) to vibrate. The piezoelectric resonator according to feature 1.

11. The first helical spring (5) and the second helical spring (25) are arranged to form an angle within the range of 80° to 160°. The piezoelectric resonator according to claim 10.

12. The first helical spring (5) and the second helical spring (25) are arranged axially symmetrically with respect to each other. The piezoelectric resonator according to claim 10.

13. They are essentially located on the same plane. The piezoelectric resonator according to feature 1.

14. The vibrating weights (2, 12) are configured to vibrate at the natural frequencies of the piezoelectric resonators (1, 10, 20). The piezoelectric resonator according to feature 1.

15. A piezoelectric motor for a timekeeping display device, The piezoelectric resonator (1, 10, 20) is provided as described in claim 1. A piezoelectric motor characterized by the following features.

16. It comprises at least one claw (52) and a movable wheel (51), The claw (52) is attached to the vibrating weight (32) of the piezoelectric resonator (1), thereby causing the movable wheel (51) to rotate in the first direction when the vibrating weight (32) vibrates. The piezoelectric motor according to feature 15.

17. A timekeeping device comprising a timekeeping movement having a gear transmission configured to rotate at least one hand, The timer comprises a piezoelectric resonator (1, 10, 20) as described in claim 1, or a piezoelectric motor (30) as described in claim 16, configured to actuate the gear transmission. A timekeeping device characterized by the following features.

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