Piezoelectric driving mechanism, camera module and electronic device

Abstract

The utility model relates to a piezoelectric drive mechanism, camera module and electronic equipment, including movable element, fixed part, and drive the piezoelectric drive assembly of movable element relative the movement of fixed part, be equipped with rigid noise reduction part between piezoelectric drive assembly with movable element, and / or be equipped with rigid noise reduction part between piezoelectric drive assembly with fixed part. Advantages are in: the rigid noise reduction part of design between piezoelectric drive assembly and movable element and / or fixed part is set up, reduces amplitude through high modulus metal / nonmetal spacer, thereby reduces the noise, and reduced the vibration stress that transmits to fixed part and other connecting structure, effectively promoted system overall reliability and service life.

Description

Technical Field

[0001] This application belongs to the field of digital photography components, and in particular relates to a piezoelectric drive mechanism, a camera module, and an electronic device. Background Technology

[0002] The core driving components of a piezoelectric motor typically consist of a piezoelectric resonator, a preload device, and a friction plate. The friction plate is usually connected to the driven part (such as a carrier) (usually by adhesive). When the motor is energized, the resonator excites the corresponding operating mode. Friction exists between the resonator's friction head and the friction plate, thereby driving the carrier to move.

[0003] In the prior art, when a piezoelectric motor moves, vibrations are transmitted to components that are rigidly connected to it. These components produce minute vibrational displacements, which generate vibrational noise and seriously affect the imaging performance of the optical device. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems by providing a piezoelectric drive mechanism, camera module, and electronic device that can solve the above-mentioned technical issues.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A piezoelectric drive mechanism includes a movable member, a fixed member, and a piezoelectric drive assembly for driving the movable member to move relative to the fixed member. A rigid noise reduction element is provided between the piezoelectric drive assembly and the movable member, and / or the rigid noise reduction element is provided between the piezoelectric drive assembly and the fixed member.

[0007] Furthermore, the piezoelectric drive assembly includes an elastic preload member, a piezoelectric vibrator, and a friction plate. The elastic preload member abuts the piezoelectric vibrator against the friction plate. The elastic preload member is fixedly connected to the fixed member through the rigid noise reduction member, and the friction plate is fixedly connected to the movable member.

[0008] Furthermore, the piezoelectric drive assembly includes an elastic preload member, a piezoelectric vibrator, and a friction plate. The elastic preload member abuts the piezoelectric vibrator against the friction plate. The elastic preload member is disposed between the piezoelectric vibrator and the fixed member. The friction plate is fixedly connected to the movable member through the rigid noise reduction member.

[0009] Furthermore, the piezoelectric drive assembly includes an elastic preload member, a piezoelectric vibrator, and a friction plate. The elastic preload member abuts the piezoelectric vibrator against the friction plate. The piezoelectric vibrator is fixedly connected to the fixing member. The elastic preload member is fixedly connected to the moving member through the rigid noise reduction member.

[0010] Furthermore, the elastic preload and the friction plate are fixedly connected or integrally formed.

[0011] Furthermore, the piezoelectric drive assembly includes an elastic preload member, a piezoelectric vibrator, and a friction plate. The elastic preload member abuts the piezoelectric vibrator against the friction plate. The elastic preload member is directly fixed to the fixed member by adhesive, and / or the elastic preload member is directly fixed to the movable member by adhesive.

[0012] Furthermore, the piezoelectric vibrator includes a friction bulge that directly abuts against the friction plate.

[0013] Furthermore, the rigid noise reduction component is in the form of a block or a sheet. The rigid noise reduction component (4) is a metal or non-metal rigid gasket with a Young's modulus greater than or equal to 110 GPa.

[0014] As one application, this application also provides a camera module, which includes the aforementioned piezoelectric drive mechanism.

[0015] As one application, this application also provides an electronic device, which includes the aforementioned camera module.

[0016] Compared with existing technologies, the advantages of this application are: the rigid noise reduction component designed between the piezoelectric drive assembly and the moving and / or fixed parts reduces the amplitude through high-modulus metal / non-metal gaskets, thereby reducing noise and reducing the vibration stress transmitted to the fixed parts and other connecting structures, effectively improving the overall reliability and service life of the system. Attached Figure Description

[0017] Figure 1 Figure 1 shows an exploded view of some components of a piezoelectric drive mechanism according to this utility model;

[0018] Figure 2 An exploded view of the piezoelectric drive assembly and related components of this utility model;

[0019] Figure 3 Figure 2 shows an exploded view of some components of a piezoelectric drive mechanism according to this utility model;

[0020] Figure 4 Figure 1 illustrates an example of the position design of the noise-reducing flexible component of this utility model;

[0021] Figure 5 An exploded view of an assembly of a piezoelectric drive component in the prior art;

[0022] Figure 6 This is a schematic diagram of the TULA resonator structure illustrated in Example 1;

[0023] Figure 7 This is a contour plot of the deformation vibration of the elastic preload in the TULA resonator structure.

[0024] Figure 8 This is a deformation vibration cloud diagram of the friction plate of this utility model;

[0025] Figure 9 Figure 2 illustrates an example of the noise reduction flexible component position design of this utility model;

[0026] Figure 10 This is a schematic diagram illustrating an example of an electronic device in Embodiment 3.

[0027] In the figure, the moving part is 1, the fixed part is 2, the piezoelectric drive assembly is 3, the rigid noise reduction part is 4, the elastic preload part is 5, the piezoelectric vibrator is 6, the friction plate is 7, and the friction protrusion is 8. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0032] Example 1

[0033] This embodiment describes a piezoelectric drive mechanism for enabling piezoelectric motors in noise-sensitive terminal applications such as autofocus motors in mobile phones, specifically as follows: Figures 1-3 As shown, the device includes a fixed member 2 and a movable member 1, as well as a piezoelectric drive assembly 3 that drives the movable member 1 to move relative to the fixed member 2. A rigid noise reduction component 4 is provided between the piezoelectric drive assembly 3 and the movable member 1, and / or a rigid noise reduction component 4 is provided between the piezoelectric drive assembly 3 and the fixed member 2. The rigid noise reduction component 4 can be designed with its position distribution according to the actual working conditions.

[0034] The piezoelectric drive assembly 3 includes:

[0035] The piezoelectric vibrator 6 is fixedly connected to the fixing member 2. The piezoelectric vibrator 6 is preferably a piezoelectric ceramic actuator, which is capable of generating expansion and contraction along its stacking direction when a driving voltage is applied.

[0036] Friction plate 7 is disposed between piezoelectric vibrator 6 and movable member 1. The first end of friction plate 7 is in contact with piezoelectric vibrator 6 (preferably in rigid contact), and the second end is fixedly connected to movable member 1.

[0037] The elastic preload 5 is used to apply a controllable and stable normal preload to the friction plate 7 and / or the moving part 1 to ensure reliable contact at the friction coupling interface.

[0038] To significantly suppress audible noise generated during the operation of the mechanism, especially the "humming" sound or structural resonance noise caused by high-frequency vibration transmission, this embodiment introduces a rigid noise reduction component 4 at a key location. The core feature of this rigid noise reduction component 4 is its high stiffness and high damping characteristics. Its main function is to absorb and dissipate vibration energy and block the transmission path of high-frequency vibration waves. Furthermore, in this embodiment, the rigid noise reduction component 4 is a rigid metal or non-metal gasket with a large Young's modulus (the Young's modulus of the gasket must be ≥110 GPa). That is, the rigid noise reduction component 4 is a rigid metal or non-metal gasket with a Young's modulus greater than or equal to 110 GPa.

[0039] The rigid noise reduction component 4 is designed based on the key nodes of vibration transmission, and specifically includes the following three configurations (which can be selected individually or in combination):

[0040] Location 1: Between the fixing component 2 and the elastic preload component 5 (or the piezoelectric drive assembly 3)

[0041] like Figure 5 As shown, this position mainly isolates the transmission path of the high-frequency vibration generated by the piezoelectric drive component 3 to the fixing component 2. It can efficiently absorb and dissipate the high-frequency vibration energy transmitted to the base of the fixing component 2 through the elastic preload component 5, and prevent the overall structure from generating noise.

[0042] Location 2: Between friction plate 7 and moving part 1

[0043] This is a crucial barrier to prevent high-frequency vibrations from the drive end from being directly transmitted to the moving part 1. For example... Figure 4 As shown, a rigid noise reduction component 4 is embedded at the connection interface between the friction plate 7 and the moving part 1. Utilizing its high damping characteristics, it directly absorbs and dissipates the high-frequency vibration energy transmitted along this path, blocking the transmission of vibration to the moving part 1, thereby protecting the sensitive lens load from high-frequency vibration interference and significantly reducing noise.

[0044] Location 3: Between movable part 1 and elastic preload part 5

[0045] In this case, the elastic preload 5 and the friction plate 7 are fixedly connected or integrally installed. This location mainly addresses the issue of high-frequency vibration transmission related to the application of preload. While providing a stable normal force, the elastic preload 5 itself, or its contact point with the moving part 1, may also become a vibration transmission point.

[0046] As an alternative, in this embodiment, the elastic preload 5 is directly fixed to the fixed part 2 or the movable part 1 by adhesive.

[0047] Specifically, as shown in the figure, the piezoelectric vibrator 6 includes a friction bulge 8 that directly abuts against the friction plate 7. The friction bulge 8 reduces the actual contact area with the friction plate 7, significantly increasing the local pressure at the contact interface under the same preload, which is beneficial for enhancing static friction and improving driving efficiency. Meanwhile, the rigid noise reduction component 4 is block-shaped or sheet-shaped. The shape of the rigid noise reduction component 4 is not limited to block or sheet-shaped; it can also be designed as an irregular structure (such as with bosses, grooves, ribs, etc.) according to the installation space and stress distribution. The key is that its stiffness and damping performance meet the requirements and can effectively fill or cover the target vibration transmission interface.

[0048] In the prior art, when the elastic preload element 5 and the friction plate 7 of the piezoelectric motor are not the same component, such as Figure 4 As shown. Due to the presence of the elastic preload 5, when the piezoelectric vibrator 6 is working, the impact friction between the friction protrusion 33 and the friction plate 7 will generate mechanical noise. The simulation results are as follows. Figure 8As shown. Furthermore, when the piezoelectric drive assembly 3 moves, the piezoelectric vibrator 6 itself vibrates. This vibration is transmitted to components rigidly connected to it, such as the elastic preload 5 and stationary component 1 or the elastic preload 5 and moving component 2 mentioned above, causing these components to produce minute vibrational displacements, thereby generating vibrational noise, such as... Figure 6 and Figure 7 Taking the TULA resonator structure piezoelectric motor as an example, the piezoelectric drive assembly 3 includes an elastic preload 5, a piezoelectric vibrator 6, and a friction plate 7. The piezoelectric vibrator 6 is connected to the stationary component, and the elastic preload 5 and the friction plate 7 are both connected to the moving component 2. The elastic preload 5 presses the piezoelectric vibrator 6 against the friction plate 7. A rigid noise reduction component 4 is provided between the elastic preload 5 and the moving component 2, and / or a rigid noise reduction component 4 is provided between the friction plate 7 and the moving component 2.

[0049] like Figure 6 The elastic preload 5 of the TULA shown is connected to the moving part 2 by thermal riveting, and the elastic preload 5 and the friction plate 7 are fixedly connected as a whole. When the TULA is powered on, the elastic preload 5 on the carbon rod holding the piezoelectric vibrator 6 will also vibrate. The spring vibration cloud diagram is shown below. Figure 7 As shown. If the elastic preload 5 is connected to the moving part 2, the edge of the elastic preload 5 will continuously collide with the moving part 2 due to vibration, thereby generating noise. The vibration energy is calculated as Q = 1 / 2 × k × A2, where Q is the vibration energy, k is the system stiffness, and A is the amplitude. The rigid noise reduction component 4 can effectively suppress vibration and noise during the piezoelectric drive process. This design, by setting the rigid noise reduction component 4 between the elastic preload 5 and the moving part 2, and / or between the friction plate 7 and the moving part, can effectively reduce vibration transmission and noise generation. The rigid noise reduction component 4 can absorb or disperse vibration energy, thereby reducing the overall vibration and noise level of the device.

[0050] Example 2

[0051] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that, for the piezoelectric drive mechanism of Embodiment 1, the camera module of this embodiment includes a piezoelectric drive mechanism.

[0052] A camera module is a precision optical component that uses electronic control to adjust the position or shape of lenses to alter the focusing and imaging of light. These modules are widely used in cameras, laser devices, and other applications, enabling functions such as autofocus, optical zoom, and image stabilization, thereby improving image quality and system performance.

[0053] Example 3

[0054] The structure and principle of this embodiment are basically the same as those of Embodiment 2. The difference is that, in relation to the camera module of Embodiment 2, the electronic device in this embodiment includes a camera module.

[0055] As shown in the figure, electronic devices refer to those devices that rely on electronic technology to perform specific functions, such as processing signals, data, or converting energy. They are widely used in fields such as communication, computing, entertainment, and industrial control, including but not limited to smartphones, computers, televisions, audio systems, and medical instruments, which greatly improve the convenience and efficiency of modern life.

[0056] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A piezoelectric drive mechanism, comprising a movable member (1), a fixed member (2), and a piezoelectric drive assembly (3) for driving the movable member (1) to move relative to the fixed member (2), characterized in that, A rigid noise reduction component (4) is provided between the piezoelectric drive assembly (3) and the moving part (1), and / or the rigid noise reduction component (4) is provided between the piezoelectric drive assembly (3) and the fixed part (2).

2. The piezoelectric drive mechanism according to claim 1, characterized in that, The piezoelectric drive assembly (3) includes an elastic preload member (5), a piezoelectric vibrator (6), and a friction plate (7). The elastic preload member (5) abuts the piezoelectric vibrator (6) against the friction plate (7). The elastic preload member (5) is fixedly connected to the fixed member (2) through the rigid noise reduction member (4), and the friction plate (7) is fixedly connected to the movable member (1).

3. The piezoelectric drive mechanism according to claim 1, characterized in that, The piezoelectric drive assembly (3) includes an elastic preload member (5), a piezoelectric vibrator (6), and a friction plate (7). The elastic preload member (5) abuts the piezoelectric vibrator (6) against the friction plate (7). The elastic preload member (5) is located between the piezoelectric vibrator (6) and the fixed member (2). The friction plate (7) is fixedly connected to the movable member (1) through the rigid noise reduction member (4).

4. The piezoelectric drive mechanism according to claim 1, characterized in that, The piezoelectric drive assembly (3) includes an elastic preload member (5), a piezoelectric vibrator (6) and a friction plate (7). The elastic preload member (5) abuts the piezoelectric vibrator (6) against the friction plate (7). The piezoelectric vibrator (6) is fixedly connected to the fixing member (2). The elastic preload member (5) is fixedly connected to the movable member (1) through the rigid noise reduction member (4).

5. A piezoelectric drive mechanism according to claim 4, characterized in that, The elastic preload (5) and the friction plate (7) are fixedly connected or integrally set.

6. The piezoelectric drive mechanism according to claim 1, characterized in that, The piezoelectric drive assembly (3) includes an elastic preload member (5), a piezoelectric vibrator (6), and a friction plate (7). The elastic preload member (5) abuts the piezoelectric vibrator (6) against the friction plate (7). The elastic preload member (5) is directly fixed to the fixing member (2) by adhesive, and / or the elastic preload member (5) is directly fixed to the moving member (1) by adhesive.

7. A piezoelectric drive mechanism according to any one of claims 1-6, characterized in that, The rigid noise reduction component (4) is a metal or non-metal rigid gasket with a Young's modulus greater than or equal to 110 GPa.

8. A piezoelectric drive mechanism according to any one of claims 1-6, characterized in that, The rigid noise reduction component (4) is in the form of a block or sheet.

9. A camera module, characterized in that, The camera module includes a piezoelectric drive mechanism as described in any one of claims 1-8.

10. An electronic device, characterized in that, The electronic device includes the camera module as described in claim 9.

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