Piezoelectric driving device and electronic equipment

Abstract

The invention discloses a piezoelectric driving device and electronic equipment, and relates to the technical field of drivers, the piezoelectric driving device comprises a driven part and a piezoelectric body, the piezoelectric body is arranged on one side of the driven part, the piezoelectric body can act on the driven part through bending vibration, and the driven part is driven by the piezoelectric body. The piezoelectric driving device further comprises a supporting component and an elastic component, the supporting component is used for supporting the piezoelectric body, the supporting component is movably connected with the piezoelectric body, and the elastic component is arranged between the supporting component and the piezoelectric body and acts on the piezoelectric body to continuously apply elastic force to the piezoelectric body to move in the direction close to the driven component. The device is simple and compact in structure, production procedures and assembly steps of the device are reduced, the production and assembly difficulty of the device is reduced, automatic production and assembly of products are facilitated, the piezoelectric body can be movably adjusted between the positions close to and away from the driven part on the supporting part, and the production efficiency is improved. And the piezoelectric body can be used according to conditions and requirements of different use scenes, users and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of drivers, and in particular to a piezoelectric driving device and an electronic device. Background Art

[0002] Piezoelectric motor is a new type of micro motor, which uses the inverse piezoelectric effect of piezoelectric materials to excite the stator's micro-vibration in the ultrasonic frequency band, and converts the vibration into the rotor's (rotor's) rotational (linear) motion through the friction between the stator and the rotor (mator).

[0003] At present, due to the relatively complex structure of piezoelectric motors, the production process steps are relatively more, and the assembly process is cumbersome, which is not conducive to the realization of automated production and assembly of products. Secondly, in the piezoelectric motor structure, the stator needs to use springs or other elastic materials to achieve the purpose of applying a certain pre-pressure to the rotor (mover), but the stator cannot adjust the pre-pressure acting on the rotor (mover), resulting in the product being unable to meet the needs of different usage scenarios or users. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a piezoelectric driving device and an electronic device to solve the problem that the piezoelectric driving device has a complex structure and cannot adjust the preload force acting on the driven component.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, a piezoelectric driving device is provided, comprising:

[0007] a driven component; and

[0008] a piezoelectric body, arranged on one side of the driven component, wherein the piezoelectric body can act on the driven component through bending vibration to move the driven component;

[0009] A supporting component, used for supporting the piezoelectric body, wherein the supporting component is movably connected to the piezoelectric body, and the piezoelectric body can be movably adjusted between a position close to and a position away from the driven component relative to the supporting component;

[0010] The elastic component is disposed between the supporting component and the piezoelectric body and acts on the piezoelectric body to continuously apply elastic force to the piezoelectric body to move toward the driven component.

[0011] As an optional implementation, a piezoelectric bracket is provided between the piezoelectric body and the supporting component, and the piezoelectric body is movably mounted on the supporting component through the piezoelectric bracket;

[0012] One end of the piezoelectric body close to the driven component is exposed from the piezoelectric support, and an active gap is formed between the piezoelectric body and the piezoelectric support for the piezoelectric body to perform bending vibration relative to the piezoelectric support.

[0013] As an optional embodiment, the piezoelectric support has a cylindrical structure, a hollow receiving cavity is formed in the piezoelectric support, and a first opening and a second opening communicating with the receiving cavity are respectively opened at opposite ends of the piezoelectric support, the first opening is located at one end of the piezoelectric support close to the driven component, and the second opening is located at one end of the piezoelectric support close to the supporting component;

[0014] The piezoelectric body is placed in the accommodating cavity, the first end of the piezoelectric body extends out of the piezoelectric support through the first opening and abuts against the driven component, and the second end of the piezoelectric body is exposed through the second opening and is connected to the elastic component to provide an action position for the elastic component.

[0015] As an optional implementation, the outer peripheral surface of the piezoelectric support is provided with an external thread structure, the support component is provided with a threaded hole adapted to the external thread structure, and the piezoelectric support is threadedly connected to the threaded hole through the external thread structure;

[0016] The elastic component is arranged in the threaded hole.

[0017] As an optional implementation, the elastic component is a compression spring, one end of the compression spring abuts against the piezoelectric body and / or the piezoelectric support, and the other end of the compression spring abuts against the bottom of the threaded hole.

[0018] As an optional embodiment, the piezoelectric support has a cylindrical structure, a hollow receiving cavity is formed in the piezoelectric support, and a first opening and a second opening communicating with the receiving cavity are respectively opened at opposite ends of the piezoelectric support, the first opening is located at one end of the piezoelectric support close to the driven component, and the second opening is located at one end of the piezoelectric support close to the supporting component;

[0019] The piezoelectric body is placed in the accommodating cavity, the first end of the piezoelectric body extends out of the piezoelectric support through the first opening and abuts against the driven component, the second end of the piezoelectric body is exposed through the second opening and abuts against the elastic component, the compression spring abuts against the second end of the piezoelectric body, and a gasket is arranged between the compression spring and the piezoelectric body.

[0020] As an optional implementation, a buffer material is filled between the piezoelectric support and the piezoelectric body.

[0021] As an optional embodiment, the piezoelectric body is integrally formed of a piezoelectric material, and the piezoelectric body is provided with a first electrode, a ground electrode and a second electrode spaced apart from each other in sequence from an end close to the driven component to an end close to the supporting component;

[0022] The first electrode and the second electrode are used to communicate with an external control unit. When the first electrode receives a driving signal, the piezoelectric body drives the driven component to move in a first direction. When the second electrode receives a driving signal, the piezoelectric body drives the driven component to move in a second direction. The first direction is opposite to the second direction.

[0023] As an optional implementation, a flexible circuit board is further provided on the piezoelectric body, and the flexible circuit board is respectively welded and connected to the first electrode, the ground electrode and the second electrode;

[0024] The first electrode and the second electrode are communicatively connected to an external control unit via the flexible printed circuit board.

[0025] In a second aspect, an electronic device is provided, including:

[0026] a first equipment component; and

[0027] a second equipment component, the first equipment component being movably connected to the second equipment component;

[0028] In the piezoelectric driving device according to the first aspect, the driven component is mounted on the first device component, and the supporting component is mounted on the second device component.

[0029] The beneficial effects of the present invention are as follows: in the piezoelectric drive device, the piezoelectric body and the elastic component are both supported by the supporting component. Compared with the piezoelectric motor in the prior art, the piezoelectric drive device uses fewer component materials and has a simple and compact structure, thereby reducing the production process and assembly steps of the device, reducing its production and assembly difficulty, and facilitating the automated production and assembly of the product.

[0030] At the same time, the piezoelectric body can be located on the supporting component and can be movably adjusted between positions close to and away from the driven component, allowing the piezoelectric body to adjust the pressure it applies to the driven component according to different usage scenarios, users and other conditions and needs, thereby improving the applicability of the product under different conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0032] Figure 1 This is a schematic diagram of the overall structure of the piezoelectric drive device according to an embodiment of the present invention;

[0033] Figure 2 Schematic diagram of the radial structure of the piezoelectric drive device according to an embodiment of the present invention (driven components omitted).

[0034] In the figure: 10, driven component; 11, rotating disk; 12, bearing; 13, rotating shaft; 20, piezoelectric body; 21, first electrode; 22, grounding electrode; 23, second electrode; 24, friction component; 30, supporting component; 31, threaded hole; 40, elastic component; 41, gasket; 50, piezoelectric bracket; 51, receiving cavity; 52, first opening; 53, second opening; 54, external thread structure; 55, buffer material. DETAILED DESCRIPTION

[0035] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention are further described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] Piezoelectric motor is a new type of micro motor, which uses the inverse piezoelectric effect of piezoelectric materials to excite the stator's micro-vibration in the ultrasonic frequency band, and converts the vibration into the rotor's (rotor's) rotational (linear) motion through the friction between the stator and the rotor (mator).

[0039] As can be seen from the background technology, the current piezoelectric motor has a relatively complex structure, resulting in relatively more production process steps and cumbersome assembly process, which is not conducive to the realization of automated production and assembly of products. Secondly, in the piezoelectric motor structure, the stator needs to use springs or other elastic materials to achieve the purpose of applying a certain pre-pressure to the rotor (mover), but the stator cannot adjust the pre-pressure acting on the rotor (mover), resulting in the product being unable to meet the needs of different usage scenarios or users.

[0040] To this end, the present embodiment provides a piezoelectric drive device, which can be applied to any electronic device that requires active adjustment of the relative positions of two movable parts that move together. The piezoelectric drive device changes its assembly structure and optimizes the assembly relationship between the component materials, thereby solving a series of problems existing in the above-mentioned piezoelectric motor, such as the complex structure and the inability to adjust the pre-pressure acting on the rotor (motor).

[0041] Please refer to the attached Figure 1-Figure 2 The piezoelectric driving device includes a driven component 10 and a piezoelectric body 20. A preset driving signal (such as voltage) is applied to the piezoelectric body 20 to stimulate the piezoelectric body 20 to generate a bending-cutting characteristic mode. Under the coupling of the end of the piezoelectric body 20 close to the driven component 10, a motion of a preset trajectory (for example, an elliptical trajectory motion) is formed, and the driven component 10 is driven to move by friction.

[0042] It should be noted that the "bending-shearing characteristic mode" refers to the vibration characteristic mode of bending and shearing generated by the piezoelectric body 20 when it is excited. After the superposition of these two vibration characteristic modes, the piezoelectric body 20 will generate bending vibration and couple at its end close to the driven component 10 to form an elliptical trajectory motion, so that the piezoelectric body 20 drives the driven component 10 to move around its own rotation axis or in a straight line direction.

[0043] It should be noted that the driven component 10 may be a rotating component that can rotate around its own rotation axis, or a moving component that can move linearly along a straight line or an arc.

[0044] In one embodiment, if Figure 1-Figure 2 As shown, the driven component 10 is disc-shaped and has a rotating disk 11 as the driven component 10 which can rotate around its own central axis. The rotating disk 11 can be rotatably matched with its rotating shaft 13 through a bearing 12. At this time, when the piezoelectric body 20 does not receive a driving signal, at least a portion of the piezoelectric body 20 is maintained on the outer peripheral surface of the rotating disk 11. When the piezoelectric body 20 receives a driving signal and generates bending vibration, the piezoelectric body 20 acts on the outer peripheral surface of the rotating disk 11 with an ultrasonic vibration frequency, so that the rotating disk 11 rotates around the rotating shaft 13 through the bearing 12.

[0045] In another embodiment, the driven component 10 is in the form of a bar-shaped rod structure extending in a straight line or an arc direction, and has the ability to perform linear or arc reciprocating motion in the direction in which it extends. At this time, when the piezoelectric body 20 does not receive a driving signal, the end of the piezoelectric body 20 is maintained against at least one side surface of the driven component 10 as described above. When the piezoelectric body 20 receives a driving signal and generates bending vibration, the piezoelectric body 20 acts on the side surface of the driven component 10 at an ultrasonic vibration frequency, so that the driven component 10 can move in a straight line or an arc direction.

[0046] Of course, the piezoelectric body 20 may also be configured to not abut against the above-mentioned surface of the driven component 10 when not receiving a driving signal, but to abut against other surfaces of the driven component 10 .

[0047] In addition, it is worth mentioning that in any of the above embodiments, the configuration in which the piezoelectric body 20 is located on the driven component 10 is not limited to the configuration in which the piezoelectric body 20 is located on the driven component 10. Figure 1-Figure 2 The way of composition.

[0048] In other embodiments, a plurality of piezoelectric bodies 20 may be arranged along the moving direction of the driven component 10. For example, when the driven component 10 is a rotating component, a plurality of piezoelectric bodies 20 may be arranged around the outer periphery of the driven component 10, and the driven component 10 may be rotated by driving the plurality of piezoelectric bodies 20. When the driven component 10 is a moving component that moves along a straight line or an arc, a plurality of piezoelectric bodies 20 may be arranged at intervals along the moving straight line or arc direction of the driven component 10, and the driven component 10 may be moved along the straight line or arc direction by driving the plurality of piezoelectric bodies 20.

[0049] According to the above, the piezoelectric body 20 is disposed on one side of the driven component 10 and can act on the driven component 10 through the bending vibration generated when it receives the driving signal, thereby causing the driven component 10 to generate circumferential or linear movement. In the embodiment where the driven component 10 is the above-mentioned rotating component, an encoder is provided on the driven component 10, and the electronic device using the piezoelectric drive device can detect the movement of the driven component 10, especially the rotation amount and angular velocity, through the encoder. Here, there is no special limitation on the encoder, for example, it can be an incremental encoder that detects the rotation amount of the driven component 10 when it rotates, or it can be an absolute value encoder that detects the absolute position of the driven component 10 relative to the origin regardless of whether the driven component 10 rotates.

[0050] As a specific embodiment of the piezoelectric body 20, the piezoelectric body 20 in the above embodiment can be configured to include a vibrating body and a plurality of piezoelectric elements arranged on the vibrating body. The vibrating body serves as a supporting structure for each piezoelectric element. In the case of a carrier of a seat piezoelectric element, when the piezoelectric element receives a driving signal and generates bending vibration, the piezoelectric elements at different positions and motion states thereon can perform bending vibrations in a preset direction and motion trajectory, thereby realizing the driving of the driven component 10. Therefore, it can also be understood that the above-mentioned piezoelectric elements are respectively connected to the control unit outside the piezoelectric driving device in communication, so as to realize the bending vibration of the piezoelectric body 20 as a whole in different directions by applying driving signals to different piezoelectric elements.

[0051] Of course, in other embodiments, the piezoelectric body 20 may also be configured to be made of an integrally formed piezoelectric material, so that the piezoelectric body 20 can be subjected to bending vibrations in different directions by applying corresponding driving signals to electrodes located in different regions of the piezoelectric body 20 .

[0052] It should be understood that the present embodiment does not particularly limit the constituent material of the piezoelectric body 20. Specifically, piezoelectric materials may be used, such as lead zirconate titanate (PZT), barium titanate, lead titanate, potassium niobate, lithium niobate, lithium tantalate, sodium tungstate, zinc oxide, barium strontium titanate (BST), strontium bismuth tantalate (SBT), lead metaniobate, scandium lead niobate, etc. In addition, as the piezoelectric body 20, in addition to the above-mentioned piezoelectric ceramics, polyvinylidene fluoride, crystal, etc., which are materials that generate bending vibrations between the two end faces when subjected to voltage, may also be used.

[0053] Please continue to refer to the attached Figure 1-Figure 2 The piezoelectric driving device provided in this embodiment also includes a supporting component 30, which is mainly used to support the piezoelectric body 20, and the elastic component 40 described later in this embodiment. In the application of electronic equipment, the supporting component 30 serves as a connecting member between the piezoelectric body 20 and the electronic equipment. Further, the supporting component 30 and the piezoelectric body 20 can be movably connected, and the piezoelectric body 20 can be movably adjusted between the position close to and away from the driven component 10 relative to the supporting component 30 to adjust the pre-pressure of the piezoelectric body 20 on the driven component 10. As the piezoelectric body 20 is movably adjusted in the direction of approaching the driven component 10, the pre-pressure of the piezoelectric body 20 on the driven component 10 will gradually increase. Conversely, as the piezoelectric body 20 is movably adjusted in the direction of departing from the driven component 10, the pre-pressure of the piezoelectric body 20 on the driven component 10 will gradually decrease, so that the piezoelectric body 20 can adjust the pressure it applies to the driven component 10 according to different usage scenarios, user conditions and requirements, thereby improving the applicability of the product under different conditions.

[0054] In the above-mentioned adjustment structure of the piezoelectric body 20 and the support component 30, the movable adjustment of the piezoelectric body 20 relative to the support component 30 can be steplessly adjusted or graded, wherein steplessly adjusted means that the piezoelectric body 20 can be adjusted to any position in the direction of approaching and moving away from the driven component 10 relative to the support component 30, and self-locked at any position between the positions close to and away from the driven component 10. For example, a threaded structure is provided between the support component 30 and the piezoelectric body 20, and the relative position of the piezoelectric body 20 and the support component 30 is adjusted by the threaded structure. In addition, the threaded structure also has a certain self-locking ability, thereby being able to meet the stability requirements of the piezoelectric body 20 on the support component 30. Alternatively, a matching guide rail and slider are provided between the support component 30 and the piezoelectric body 20, so that the piezoelectric body 20 can be movably adjusted on the guide rail installed on the support component 30 with the slider, and when the slider stops sliding relative to the guide rail, the slider can be wedged in the guide rail to achieve self-locking of the piezoelectric body 20 on the support component 30. The graded adjustment means that a plurality of mutually spaced locking positions are configured between the support component 30 and the driven component 10, and the piezoelectric body 20 can be movably adjusted between the locking positions in the direction of approaching and moving away from the driven component 10, and the piezoelectric body 20 can also be locked in any locking position. For example, a plurality of snap structures can be provided between the support component 30 and the piezoelectric body 20, so that the piezoelectric body 20 can be movably adjusted between the plurality of snap structures and locked in the position of any snap structure after the movably adjusted.

[0055] In order to maintain a corresponding pre-pressure between the piezoelectric body 20 and the driven component 10, and to allow the piezoelectric body 20 and the supporting component 30 to maintain a relatively stable position and connection state in an inactive adjustment state, the piezoelectric driving device of this embodiment also includes an elastic component 40. The elastic component 40 is specifically arranged between the supporting component 30 and the piezoelectric body 20 and acts on the piezoelectric body 20, continuously applying elastic force to the piezoelectric body 20 to move toward the driven component 10.

[0056] According to the specific embodiment of the elastic component 40 mentioned above, it can be understood that the movable connection between the piezoelectric body 20 and the support component 30 needs to have a certain self-locking ability, that is, when the piezoelectric body 20 is movably adjusted to the desired position relative to the support component 30, when there is no external force acting on the piezoelectric body 20 or the support component 30 in the movable adjustment direction of the piezoelectric body 20, or the external force is less than the force required for the movable adjustment of the piezoelectric body 20, the relative position relationship between the piezoelectric body 20 and the support component 30 can remain stable.

[0057] Generally speaking, in order to enable the piezoelectric body 20 and the support component 30 to be movable and adjustable, there will be a certain movable gap at the movable connection between the two. Of course, when using high-precision processing methods and movable matching structures, the size of the movable gap between the two can be ignored. However, in order to compensate for the movable gap between the two, or in other words, to make the state of the piezoelectric body 20 on the support component 30 more stable, an elastic component 40 is provided between the piezoelectric body 20 and the support component 30. The elastic component 40 can push the piezoelectric body 20 toward the direction of the driven component 10 after the piezoelectric body 20 is movable and adjustable relative to the support component 30. Since there is an movable adjustment between the piezoelectric body 20 and the support component 30, Therefore, under the action of the elastic component 40, the elastic force acting on the piezoelectric body 20 will not act entirely on the driven component 10 through the piezoelectric body 20, but at least partially on the supporting component 30 through the piezoelectric body 20, thereby achieving the purpose of eliminating the activity gap between the piezoelectric body 20 and the supporting component 30. In addition, the elastic component 40 continuously applies an elastic force to the piezoelectric body 20 in the direction of the driven component 10, which can also enable the piezoelectric body 20 to be stably pressed against the driven component 10, and then by adjusting the activity between the piezoelectric body 20 and the supporting component 30, the pre-pressure between the piezoelectric body 20 and the driven component 10 is adjusted, so that the piezoelectric drive device can meet the use requirements under different conditions.

[0058] In the above embodiment, the piezoelectric body 20 and the elastic component 40 are both supported by the supporting component 30. Compared with the piezoelectric motor in the prior art, the piezoelectric drive device uses fewer component materials and has a simple and compact structure, thereby reducing the production process and assembly steps of the device, reducing its production and assembly difficulty, and facilitating the automated production and assembly of the product.

[0059] In some embodiments, in order to make the circumferential or linear motion of the driven component 10 more stable, and to keep the driven component 10 in a more stable state of stopping motion when the piezoelectric body 20 does not receive a driving signal, a friction component 24 for increasing the surface friction between the piezoelectric body 20 and the driven component 10 may be provided at a position of the piezoelectric body 20 close to the driven component 10 and used to act on the surface of the driven component 10. In one embodiment, the friction component 24 and the piezoelectric body 20 may be a separate structure, and the friction component 24 may be set to be different from the material of the piezoelectric body 20, and then fixed to the piezoelectric body 20 by bonding, welding, clamping, nesting or fastener connection. Of course, the friction component 24 and the piezoelectric body 20 may also be processed by an integrated molding process. In the embodiment where the friction component 24 and the piezoelectric body 20 are made of the same material, it can be understood that the piezoelectric body 20 may be regarded as a friction component 24 by processing a frosted texture, anti-slip lines and other structures at one end of the piezoelectric body 20 close to the driven component 10.

[0060] It should be noted that the friction component 24 disposed at the end of the piezoelectric body 20 may be a cylindrical, semi-cylindrical, hemispherical, triangular pyramidal, etc. structure, which may be specifically configured according to actual needs, and the friction component 24 may be fixedly disposed at the center position of one end surface of the piezoelectric body 20 close to the driven component 10. In the embodiment where the friction component 24 and the piezoelectric body 20 are designed separately, the friction component 24 may be made of wear-resistant material, which may be various high-hardness wear-resistant ceramic materials, such as aluminum oxide, zirconium oxide, silicon carbide ceramics, or highly wear-resistant metal materials, carbon fiber materials, and composite materials of ceramics, metal particles and polymers, etc., so as to improve the wear resistance of the friction component 24.

[0061] As an embodiment that can be used in conjunction with or alternatively to the embodiment in which the end of the piezoelectric body 20 is provided with a friction component 24, the surface of the driven component 10 can also be provided as a friction surface that can increase the friction between it and the piezoelectric body 20 or the friction component 24. Similar to the friction component 24, the friction surface can be made of wear-resistant materials, which can be various high-hardness wear-resistant ceramic materials, such as aluminum oxide, zirconium oxide, silicon carbide ceramics, or high-wear-resistant metal materials, carbon fiber materials, and composite materials of ceramics, metal particles and polymers.

[0062] It should be noted that the support component 30 needs to be set as a non-conductive structure to avoid affecting the polarization of the piezoelectric body 20. Specifically, the support component 30 can be made of a material with higher hardness, such as hard plastic, metal structure (such as stainless steel and other hardware), etc. When the support component 30 is a metal structure, an insulating film can be set on its surface or it can be grounded to avoid affecting the polarization of the piezoelectric body 20. For example, it is made of materials such as hard rubber, ceramics or diamond, so that the part of the support component 30 used to cooperate with the piezoelectric body 20 will basically not be deformed, and the support component 30 can form a rigid constraint on the piezoelectric body 20, thereby better exciting the characteristic mode of the piezoelectric body 20.

[0063] Please continue to refer to the attached Figure 1-Figure 2 On the basis of the above-mentioned embodiment, a piezoelectric bracket 50 is provided between the piezoelectric body 20 and the supporting component 30, and the piezoelectric body 20 is movably mounted on the supporting component 30 through the piezoelectric bracket 50. In this way, the piezoelectric body 20 does not need to form a direct physical connection with the supporting component 30. In the embodiment in which the driven component 10 is driven by the bending vibration of the piezoelectric body 20, the freedom of movement of the piezoelectric body 20 on the supporting component 30 and its requirements for surface processing are relatively high, avoiding direct connection between the piezoelectric body 20 and the supporting component 30, thereby reducing the processing steps of the piezoelectric body 20, and keeping the overall structure of the piezoelectric body 20 as flat as possible, so that it has a more superior bending vibration formation.

[0064] Continuing with the above embodiment, the piezoelectric body 20 is not directly connected to the supporting component 30, which also avoids the connection strength between the piezoelectric body 20 and the supporting component 30 being too high, resulting in a reduction in the vibration amplitude of the piezoelectric body 20 relative to the supporting component 30, thereby affecting its performance in driving the driven component 10 to move.

[0065] In order to ensure that the piezoelectric body 20 can act on the driven component 10 through its bending vibration, the end of the piezoelectric body 20 close to the driven component 10 is exposed from the piezoelectric support 50, that is, the end of the piezoelectric support 50 close to the driven component 10 is an open structure to avoid interference with the piezoelectric body 20. In addition, an active gap is formed between the piezoelectric body 20 and the piezoelectric support 50 for the piezoelectric body 20 to bend and vibrate relative to the piezoelectric support 50. The active gap is specifically formed in the bending vibration direction of the piezoelectric body 20. In one embodiment, the piezoelectric body 20 and the piezoelectric support 50 are relatively fixed along the length direction, and an active gap is formed in the radial direction for the piezoelectric body 20 to bend and vibrate. When the elastic component 40 acts on the piezoelectric support 50, the piezoelectric support 50 can drive the piezoelectric body 20 to have the same tendency to approach the driven component 10 while being axially fixed with the piezoelectric body 20;

[0066] In another embodiment, the elastic component 40 can also directly act on the main structure of the piezoelectric body 20. Regardless of whether the elastic component 40 acts on the piezoelectric body 20 through the piezoelectric support 50 or directly acts on the piezoelectric body 20, the piezoelectric body 20 and the piezoelectric support 50 need to be kept relatively fixed in the direction in which the piezoelectric body 20 moves relative to the supporting component 30, so that the piezoelectric support 50 can drive the piezoelectric body 20 to press against the driven component 10 under the action of the elastic force, or the piezoelectric body 20 can drive the piezoelectric support 50 to press against the driven component 10 under the action of the elastic force.

[0067] Exemplarily, the piezoelectric support 50 may be disposed only at one end of the piezoelectric body 20 close to the support member 30, and connected only to the end of the piezoelectric body 20 close to the support member 30, so that the piezoelectric body 20 except for the end close to the support member 30 is exposed to the outside of the piezoelectric support 50, and can generate bending vibration relative to the piezoelectric support 50 when receiving a driving signal;

[0068] As another embodiment of the assembly structure of the piezoelectric support 50 and the piezoelectric body 20, Figure 1-Figure 2As shown, the piezoelectric support 50 can be arranged on the periphery of the piezoelectric body 20 to cover most of the periphery of the piezoelectric body 20. At this time, the piezoelectric support 50 and the piezoelectric body 20 need to form the above-mentioned active gap in the direction between the driven component 10 and the supporting component 30 to ensure that when the piezoelectric body 20 generates bending vibration relative to the piezoelectric support 50, the end of the piezoelectric body 20 close to the driven component 10 can generate bending vibration in the required direction along the active direction of the driven component 10. Compared with the above-mentioned implementation, this embodiment can provide better protection for the piezoelectric body 20 to prevent the piezoelectric body 20 from being affected by external foreign matter and thus failing to achieve a good driving function.

[0069] Please continue to refer to the attached Figure 1-Figure 2 In this embodiment, the piezoelectric support 50 shields most of the piezoelectric body 20. In this example, the piezoelectric support 50 is a cylindrical structure, and a hollow receiving cavity 51 is formed in the piezoelectric support 50. The opposite ends of the piezoelectric support 50 are respectively provided with a first opening 52 and a second opening 53 connected to the receiving cavity 51. The first opening 52 is located at the end of the piezoelectric support 50 close to the driven component 10, and the second opening 53 is located at the end of the piezoelectric support 50 close to the supporting component 30. The piezoelectric body 20 is placed in the receiving cavity 51, and the first end of the piezoelectric body 20 extends out of the piezoelectric support 50 through the first opening 52 and abuts against the driven component 10. The second end of the piezoelectric body 20 is exposed through the second opening 53 and is in contact with the elastic component 40, so as to provide an action position for the elastic component 40.

[0070] According to the above-mentioned embodiment, in the embodiment where the piezoelectric driving device also includes a piezoelectric bracket 50, in addition to protecting the piezoelectric body 20, the piezoelectric body 20 can also be movably connected with the support component 30 through the piezoelectric bracket 50. Similarly to the above, the piezoelectric body 20 forms a relatively movable matching relationship with the support component 30 through the piezoelectric bracket 50, which can reduce the processing steps for the piezoelectric body 20, thereby ensuring that the piezoelectric body 20 maintains good physical properties.

[0071] Please refer to the attached Figure 1-Figure 2As a specific solution in the embodiment in which the piezoelectric body 20 forms a movable connection relationship with the support component 30 through the piezoelectric bracket 50, the outer peripheral surface of the piezoelectric bracket 50 is provided with an external thread structure 54, and the support component 30 is provided with a threaded hole 31 adapted to the external thread structure 54, and the piezoelectric bracket 50 is threadedly connected to the threaded hole 31 through the external thread structure 54. When the threaded hole 31 and the external thread structure 54 are matched, the piezoelectric bracket 50 realizes the telescopic adjustment on the threaded hole 31 through the external thread structure 54. When the piezoelectric bracket 50 and the piezoelectric body 20 are relatively fixed, the operator can rotate the external thread structure 54 in the threaded hole 31 and extend or retract it into the threaded hole 31 by twisting the piezoelectric bracket 50. It can be understood that the thread structure not only has a certain self-locking ability, but also can realize stepless adjustment between the piezoelectric body 20 and the piezoelectric bracket 50, so that the pre-pressure of the piezoelectric body 20 on the driven component 10 can be adjusted more accurately.

[0072] In the above-mentioned embodiment in which the piezoelectric bracket 50 is connected to the support component 30 by threads, the piezoelectric body 20 and the piezoelectric bracket 50 can be installed and matched only by a sleeve assembly method, and the assembly formed by the piezoelectric body 20 and the piezoelectric bracket 50 can be assembled only by screwing the piezoelectric bracket 50 to the support component 30. The overall structural assembly process of the piezoelectric drive device is simple and the assembly accuracy requirement is relatively low, so that the device can be processed and assembled in an automated manner.

[0073] Furthermore, since the piezoelectric support 50 and the piezoelectric body 20 are connected by a threaded connection, a certain assembly gap and a movable gap must exist between the external thread structure 54 and the threaded hole 31 in order to realize a movable connection. Therefore, under the action of the elastic component 40, the gap on at least one side between the external thread structure 54 and the internal thread structure in the threaded hole 31 can be eliminated, thereby achieving the above-mentioned requirements for the stability and self-locking state of the piezoelectric body 20. Continuing with the structural form provided above, as Figure 1-Figure 2 As shown, the elastic component 40 is arranged in the threaded hole 31, and is located in the threaded hole 31 to act on the piezoelectric body 20 and the supporting component 30 respectively. The space in the threaded hole 31 is used to accommodate the elastic component 40, which not only can provide good protection for the elastic component 40, but also improves the structural compactness of the piezoelectric driving device. In the component assembly process of the piezoelectric driving device, it is only necessary to place the elastic component 40 in the threaded hole 31 of the supporting component 30, and then the piezoelectric bracket 50 with the piezoelectric body 20 is screwed into the threaded hole 31 through the external thread structure 54 to realize the overall assembly of the device, meet the requirements of automated assembly, and reduce labor costs.

[0074] It should be noted that the elastic component 40 can be a spring of various shapes, such as a coil spring, a leaf spring, or other special-shaped springs.

[0075] Of course, in other embodiments, if the elastic component 40 is not disposed in the threaded hole 31, the elastic component 40 may also be configured as a spiral spring, etc., and the spring may be a compression spring or a tension spring, and its structure and function depend on the specific matching structure between the piezoelectric bracket 50 and the support component 30, or between the piezoelectric body 20 and the support component 30.

[0076] Of course, the elastic component 40 can also be made of other materials with elastic restoring properties, such as rubber, silicone, etc.

[0077] In one embodiment, the elastic component 40 located in the threaded hole 31 is a compression spring, which is a mechanical elastic element, and its main function is to apply elastic force to an object, so that it has a certain elastic deformation and rebound ability. It can be understood that the compression spring has the characteristics of relatively simple structure, low cost, etc., and its structure is relatively stable and has a long service life, which is conducive to reducing costs and improving the assembly efficiency of the device, and also ensures the stability and compactness of the structure during long-term use.

[0078] It should be noted that compression springs can be divided into circular compression springs, square compression springs, conical compression springs, special-shaped compression springs, etc. according to their shapes and elastic force characteristics. The device can be selected according to its specific usage occasions and requirements.

[0079] In the above embodiment, one end of the compression spring abuts against the piezoelectric body 20 and / or the piezoelectric support 50, and the other end of the compression spring abuts against the bottom of the threaded hole 31. According to the above, the compression spring has the following three assembly methods:

[0080] 1. The first end of the compression spring abuts against the piezoelectric body 20, and the second end of the compression spring abuts against the bottom of the threaded hole 31 to act on the supporting component 30;

[0081] 2. The first end of the compression spring abuts against the piezoelectric support 50, and the second end of the compression spring abuts against the bottom of the threaded hole 31 to act on the supporting component 30;

[0082] 3. The first end of the compression spring abuts against the piezoelectric body 20 and the piezoelectric support 50 at the same time, and the second end of the compression spring abuts against the bottom of the threaded hole 31 to act on the supporting component 30 .

[0083] Regardless of the abutment method of the compression spring, as long as the relative fixation between the piezoelectric spring and the piezoelectric body 20 is ensured, the elastic component 40 can continuously apply elastic force to the piezoelectric body 20 toward the driven component 10 to achieve the purpose.

[0084] Please continue to refer to the attached Figure 1-Figure 2 In the above-mentioned piezoelectric support 50 which is in a cylindrical structure and has a hollow receiving cavity 51 formed therein, a first opening 52 and a second opening 53 communicating with the receiving cavity 51 are respectively provided at opposite ends of the piezoelectric support 50, the first opening 52 is located at one end of the piezoelectric support 50 close to the driven component 10, and the second opening 53 is located at one end of the piezoelectric support 50 close to the supporting component 30. In the embodiment, the piezoelectric body 20 is placed in the receiving cavity 51, the first end of the piezoelectric body 20 extends out of the piezoelectric support 50 through the first opening 52 and abuts against the driven component 10, the second end of the piezoelectric body 20 is exposed through the second opening 53 and is connected to the elastic component 40, The compression spring abuts against the second end of the piezoelectric body 20, and a gasket 41 is arranged between the piezoelectric body 20 to protect the piezoelectric body 20 and prevent the compression spring from scratching the surface of the piezoelectric body 20 and affecting the physical properties of the piezoelectric body 20. At the same time, the gasket 41 can also play an anti-slip role between the compression spring and the piezoelectric body 20, and can also provide an installation position for the compression spring on the piezoelectric body 20. For example, when the gasket 41 is a metal gasket 41, the gasket 41 can be fixed to the piezoelectric body 20 by bonding or welding, and the compression spring can be bonded to the gasket 41, or, fixed to the gasket 41 by a positioning structure (such as a groove) provided on the gasket 41.

[0085] According to any of the above-mentioned embodiments, a buffer material 55 is filled between the piezoelectric support 50 and the piezoelectric body 20 to ensure stable installation between the piezoelectric body 20 and the piezoelectric support 50. At the same time, the buffer material 55 has a certain deformation ability, so that the piezoelectric body 20 can also produce bending vibration relative to the piezoelectric support 50.

[0086] In one embodiment, the buffer material 55 can be silicone, rubber, leather, foam, etc., and the buffer material 55 is located between the piezoelectric body 20 and the piezoelectric support 50 in a semi-compressed state, so that there is a certain pre-tightening force between the two, which ensures the stability of the assembly while reserving space for the piezoelectric body 20 to produce bending vibration relative to the piezoelectric support 50.

[0087] Specifically, in the above-mentioned structural form, the buffer material 55 and the piezoelectric support 50 are both cylindrical structures. During the assembly process, the piezoelectric body 20 can be first inserted into the buffer material 55 to form an assembly with the piezoelectric body 20 and the buffer material 55. Then, the buffer material 55 with the piezoelectric body 20 is inserted into the piezoelectric support 50 to ensure that the piezoelectric body 20 and the piezoelectric support 50 are filled with the buffer material 55 along the length direction, so that the opposite ends of the piezoelectric body 20 are respectively exposed from the opposite ends of the piezoelectric support 50 and the buffer material 55.

[0088] In one embodiment, the piezoelectric driver may be controlled by a control unit, and the control unit may be disposed on a main board of the electronic device.

[0089] The following embodiment takes the solution in which the piezoelectric body 20 is integrally formed of a piezoelectric material as an example. The piezoelectric body 20 is provided with a first electrode 21, a grounding electrode 22 and a second electrode 23 spaced apart from each other in sequence from one end close to the driven component 10 to the end close to the supporting component 30. The grounding electrode 22 is used to connect to the grounding terminal on the housing or the mainboard of the above-mentioned electronic device, and the piezoelectric body 20 realizes bending vibration in two directions according to the driving signal received by the first electrode 21 or the second electrode 23. Specifically, when the control unit is communicatively connected with at least the first electrode 21 and the second electrode 23, in order to apply a driving signal to the corresponding first electrode 21 or the second electrode 23, the control unit can be connected to each electrode by welding a connecting wire (such as a lead) on the mainboard.

[0090] Exemplarily, the main board of the electronic device can be configured to include a switching circuit, an excitation circuit and a grounding portion, and the switching circuit can selectively connect the first electrode 21 or the second electrode 23 to the grounding portion or to the excitation circuit, and the excitation circuit is used to apply a preset AC excitation electrical signal to the first electrode 21 or the second electrode 23, wherein the preset AC excitation electrical signal can be a sinusoidal AC excitation electrical signal or a cosine AC excitation electrical signal.

[0091] In addition, a main board may not be required in the application of electronic devices, and the piezoelectric driver may be electrically connected to the main board of the electronic device through electrical connectors (leads or pins, etc.), that is, the piezoelectric driver may be controlled through the circuit board of the electronic device.

[0092] According to the above content, when the first electrode 21 receives a driving signal, the piezoelectric body 20 drives the driven component 10 to move in the first direction, and the end of the piezoelectric body 20 close to the driven component 10 makes an elliptical motion (rotational motion) clockwise along the elliptical orbit. When the second electrode 23 receives a driving signal, the piezoelectric body 20 drives the driven component 10 to move in the second direction, and the end of the piezoelectric body 20 close to the driven component 10 makes an elliptical motion (rotational motion) counterclockwise along the elliptical orbit. Therefore, it can be understood that the first direction is opposite to the second direction, and the piezoelectric body 20 drives the driven component 10 by bending and vibrating its end in two opposite directions.

[0093] In order to integrate the electrodes on the piezoelectric body 20, a flexible circuit board (not shown) is also provided on the piezoelectric body 20. The flexible circuit board is welded and connected to the first electrode 21, the ground electrode 22 and the second electrode 23 respectively. The first electrode 21 and the second electrode 23 are communicated and connected with an external control unit through the flexible circuit board. The flexible circuit board can connect the first electrode 21, the ground electrode 22 and the second electrode 23 thereon in a unified manner, so that the piezoelectric body 20 can be connected to an external control unit and a main board through the flexible circuit board. The flexible circuit board can be suitable for use on the piezoelectric body 20 based on its physical properties, and will not be damaged when the piezoelectric body 20 is bent and vibrated.

[0094] In the case where the piezoelectric support 50 and the buffer material 55 are provided, the piezoelectric support 50 and the buffer material 55 are provided with avoidance holes at positions corresponding to the first electrode 21 , the ground electrode 22 and the second electrode 23 to provide wires for passing through and being soldered on the flexible printed circuit board.

[0095] This embodiment also provides an electronic device, which uses the above-mentioned piezoelectric driving device. In addition, the electronic device also includes a first device component and a second device component. Specifically, the first device component and the second device component are movably connected, the driven component 10 is installed on the first device component, and the supporting component 30 is installed on the second device component, so that the first device component and the second device component can achieve relative movement by bending and vibrating the piezoelectric body 20 relative to the supporting component 30 and driving the driven component 10.

[0096] In one embodiment, taking the electronic device as a smart watch as an example, the above-mentioned first device component can be understood as the watch body, and the second device component can be understood as the watch strap, wherein the watch body and the watch strap are rotatably connected. In combination with the piezoelectric driving device of this embodiment, the driven component 10 and the supporting component 30 can be respectively arranged on the watch body and the watch strap to control the rotation of the watch body relative to the watch strap under the bending vibration of the piezoelectric body 20.

[0097] In summary, the piezoelectric drive device provided in this embodiment solves the problems of the complex structure of traditional piezoelectric motors that are not conducive to automated production and assembly, and the inability to adjust the pre-pressure of the driven component 10, which makes it impossible to meet different usage scenarios and user needs, by improving and optimizing its structure. In addition, the piezoelectric drive device uses relatively few component materials and has a compact and simple structure, so the product size will be smaller than that of traditional piezoelectric motors, which is conducive to application in smaller electronic devices.

[0098] In the description herein, it should be understood that the terms "upper", "lower", "left", "right", etc., and other directions or positional relationships are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0099] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0100] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0101] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A piezoelectric drive device, characterized in that: include: A driven component (10); as well as a piezoelectric body (20) disposed on one side of the driven component (10), wherein the piezoelectric body (20) can act on the driven component (10) through bending vibration to move the driven component (10); A support component (30) for supporting the piezoelectric body (20); the support component (30) is movably connected to the piezoelectric body (20); and the piezoelectric body (20) can be movably adjusted relative to the support component (30) between a position close to and a position away from the driven component (10); The elastic component (40) is arranged between the supporting component (30) and the piezoelectric body (20) and acts on the piezoelectric body (20), continuously applying elastic force to the piezoelectric body (20) to move in a direction close to the driven component (10).

2. The piezoelectric drive device according to claim 1, characterized in that: A piezoelectric support (50) is provided between the piezoelectric body (20) and the supporting component (30), and the piezoelectric body (20) is movably mounted on the supporting component (30) via the piezoelectric support (50); One end of the piezoelectric body (20) close to the driven component (10) is exposed from the piezoelectric support (50), and an active gap is formed between the piezoelectric body (20) and the piezoelectric support (50) for the piezoelectric body (20) to bend and vibrate relative to the piezoelectric support (50).

3. The piezoelectric drive device according to claim 2, characterized in that: The piezoelectric support (50) is of a cylindrical structure, a hollow receiving cavity (51) is formed in the piezoelectric support (50), and a first opening (52) and a second opening (53) communicating with the receiving cavity (51) are respectively provided at opposite ends of the piezoelectric support (50), wherein the first opening (52) is located at one end of the piezoelectric support (50) close to the driven component (10), and the second opening (53) is located at one end of the piezoelectric support (50) close to the supporting component (30); The piezoelectric body (20) is placed in the accommodating cavity (51), the first end of the piezoelectric body (20) extends out of the piezoelectric support (50) through the first opening (52) and abuts against the driven component (10), and the second end of the piezoelectric body (20) is exposed through the second opening (53) and is in contact with the elastic component (40) to provide an action position for the elastic component (40).

4. The piezoelectric drive device according to claim 2, characterized in that: The outer peripheral surface of the piezoelectric support (50) is provided with an external thread structure (54), the support component (30) is provided with a threaded hole (31) adapted to the external thread structure (54), and the piezoelectric support (50) is threadedly connected to the threaded hole (31) via the external thread structure (54); The elastic component (40) is arranged in the threaded hole (31).

5. The piezoelectric drive device according to claim 4, characterized in that: The elastic component (40) is a compression spring, one end of which abuts against the piezoelectric body (20) and / or the piezoelectric support (50), and the other end of which abuts against the bottom of the threaded hole (31).

6. The piezoelectric drive device according to claim 5, characterized in that: The piezoelectric support (50) is of a cylindrical structure, a hollow receiving cavity (51) is formed in the piezoelectric support (50), and a first opening (52) and a second opening (53) communicating with the receiving cavity (51) are respectively provided at opposite ends of the piezoelectric support (50), wherein the first opening (52) is located at one end of the piezoelectric support (50) close to the driven component (10), and the second opening (53) is located at one end of the piezoelectric support (50) close to the supporting component (30); The piezoelectric body (20) is placed in the accommodating cavity (51); the first end of the piezoelectric body (20) extends out of the piezoelectric support (50) through the first opening (52) and abuts against the driven component (10); the second end of the piezoelectric body (20) is exposed through the second opening (53) and abuts against the elastic component (40); the compression spring abuts against the second end of the piezoelectric body (20), and a gasket (41) is provided between the compression spring and the piezoelectric body (20).

7. The piezoelectric drive device according to claim 2, characterized in that: A buffer material (55) is filled between the piezoelectric support (50) and the piezoelectric body (20).

8. The piezoelectric drive device according to any one of claims 1 to 7, characterized in that: The piezoelectric body (20) is integrally formed of a piezoelectric material, and the piezoelectric body (20) is provided with a first electrode (21), a grounding electrode (22) and a second electrode (23) which are spaced apart from each other in sequence from an end close to the driven component (10) to an end close to the supporting component (30); The first electrode (21) and the second electrode (23) are used for communication connection with an external control unit. When the first electrode (21) receives a driving signal, the piezoelectric body (20) drives the driven component (10) to move in a first direction. When the second electrode (23) receives a driving signal, the piezoelectric body (20) drives the driven component (10) to move in a second direction. The first direction is opposite to the second direction.

9. The piezoelectric drive device according to claim 8, characterized in that: A flexible circuit board is also provided on the piezoelectric body (20), and the flexible circuit board is respectively welded and connected to the first electrode (21), the ground electrode (22) and the second electrode (23); The first electrode (21) and the second electrode (23) are communicatively connected to an external control unit via the flexible printed circuit board.

10. An electronic device, characterized in that: include: a first equipment component; as well as a second equipment component, wherein the first equipment component is movably connected to the second equipment component; According to the piezoelectric drive device according to any one of claims 1 to 9, the driven component (10) is installed on the first device component, and the supporting component (30) is installed on the second device component.

Images