A piezoelectric driving device, camera module and electronic device

Abstract

The utility model relates to a piezoelectric drive device, camera module and electronic equipment, including moving part, fixed part and the piezoelectric drive component for driving moving part relative fixed part movement at least one part of piezoelectric drive component is connected to moving part, and another at least one part is connected to fixed part, the piezoelectric drive component is provided with the noise reduction flexible part between fixed part, and / or the piezoelectric drive component is provided with the noise reduction flexible part between moving part. Advantages are that: in the device design increases the noise reduction flexible part with reducing vibration noise, can effectively reduce the vibration noise that piezoelectric drive device generates in the operation process, realizes piezoelectric motor in the terminal application of sensitive to noise.

Description

Technical Field

[0001] This application belongs to the field of digital photography components, and in particular relates to a piezoelectric drive device, 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 existing technologies, vibration and noise cannot be avoided due to the working principle of piezoelectric motors. Therefore, there is an urgent need to develop a piezoelectric motor that can reduce noise problems. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems by providing a piezoelectric drive device, 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 device includes a moving member, a stationary member, and a piezoelectric drive assembly for driving the moving member to move relative to the stationary member. At least a portion of the piezoelectric drive assembly is connected to the moving member, and at least another portion is connected to the stationary member. A noise-reducing flexible member is provided between the piezoelectric drive assembly and the stationary member, and / or a noise-reducing flexible member is provided between the piezoelectric drive assembly and the moving 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 connected to a stationary member, and the friction plate is connected to a moving member. A noise-reducing flexible member is provided between the elastic preload member and the stationary member, and / or a noise-reducing flexible member is provided between the friction plate and the moving member.

[0008] Furthermore, the piezoelectric drive assembly includes an elastic preload member, a piezoelectric vibrator, and a friction plate. The piezoelectric vibrator is connected to a stationary member, and both the elastic preload member and the friction plate are connected to a moving member. The elastic preload member abuts the piezoelectric vibrator against the friction plate. A noise-reducing flexible member is provided between the elastic preload member and the moving member, and / or a noise-reducing flexible member is provided between the friction plate and the moving member.

[0009] Furthermore, the elastic preload and friction plate are fixedly connected or integrally formed.

[0010] Furthermore, the piezoelectric vibrator is provided with a friction bulge that abuts against the friction plate.

[0011] Furthermore, the noise-reducing flexible component is made of a polymer material.

[0012] Furthermore, the noise-reducing flexible component is in the form of a sheet or a block.

[0013] Furthermore, the elastic preload member is aligned and connected to the fixed member or the moving member through a positioning structure, at least a portion of which is disposed on the fixed member or the moving member, and the remaining portion is disposed on the elastic preload member.

[0014] As an application solution, this application also provides a camera module, which includes the aforementioned piezoelectric drive device.

[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: by designing and adding a noise-reducing flexible component in the device to reduce vibration and noise, the vibration and noise generated by the piezoelectric drive device during operation can be effectively reduced, enabling the piezoelectric motor to be used in noise-sensitive end applications. Attached Figure Description

[0017] Figure 1 Figure 1 shows an exploded view of some components of a piezoelectric drive device 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 device 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 position design of the noise-reducing flexible component of this utility model;

[0026] Figure 10 This is a schematic diagram of the piezoelectric vibrator of this utility model;

[0027] Figure 11 This is a schematic diagram of the deformation of the piezoelectric vibrator of this utility model;

[0028] Figure 12 This is a schematic diagram illustrating an example of an electronic device in Embodiment 5.

[0029] In the figure, there is a fixed component 1, a moving component 2, a piezoelectric drive assembly 3, an elastic preload component 30, a friction plate 31, a piezoelectric vibrator 32, a friction protrusion 33, a noise reduction flexible component 4, a positioning hole 50, a positioning pin 51, and a first axis Z. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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. Example 1

[0034] like Figures 1-3 As shown in the figure, this embodiment describes a piezoelectric drive device for use in noise-sensitive terminal applications such as autofocus motors in mobile phones. Specifically, the piezoelectric drive device includes a stationary component 1, a movable component 2 that can move relative to the stationary component 1, and a piezoelectric drive assembly 3 that drives the movable component 2 to move relative to the stationary component 1 along a first axis Z. In particular, the piezoelectric drive device also includes a noise-reducing flexible component 4, which effectively reduces the noise generated by the piezoelectric drive assembly 3 in driving the movable component 2 during operation. The noise-reducing flexible component 4 is provided between the piezoelectric drive assembly 3 and the stationary component 1, and / or between the piezoelectric drive assembly 3 and the movable component. The position of the noise-reducing flexible component 4 can be designed according to the actual working conditions.

[0035] In other embodiments, the piezoelectric drive device drives the actuator 2 to rotate or oscillate.

[0036] The piezoelectric drive assembly 3 includes an elastic preload member 30, a piezoelectric vibrator 32, and a friction plate 31. The elastic preload member 30 holds the piezoelectric vibrator 32 against the friction plate 31. The elastic preload member 30 is connected to a stationary component, and the friction plate 31 is connected to a moving component. A noise-reducing flexible member 4 is provided between the elastic preload member 30 and the stationary component, and / or between the friction plate 31 and the moving component. Specifically, the noise-reducing flexible member 4 can take various forms to adapt to different application requirements and structural spaces. For example... Figure 3 As shown, for example, the noise-reducing flexible component 4 can be designed as a sheet. Its thin and flat structure allows it to be easily installed in the space between the elastic preload component 30 and the stationary component 1 or the moving component 2 of the piezoelectric drive assembly 3 (or in the space between the friction plate 31 and the moving component 2 of the piezoelectric drive assembly 3). Through its flexibility and vibration absorption characteristics, it effectively reduces the noise generated by the elastic preload component 30 during the drive process. At the same time, the thin and light characteristics of the sheet-shaped noise-reducing flexible component 4 result in a very small increase in the weight of the overall drive device, and will not have a negative impact on the performance of the device.

[0037] In certain scenarios that require greater absorption capacity, such as Figures 1-2As shown, the noise-reducing flexible component 4 can be designed as a block. This type of noise-reducing flexible component 4 has a larger volume and a more uniform material distribution, enabling it to withstand greater vibration energy and higher loads. In the piezoelectric drive device, the block-shaped noise-reducing flexible component 4 can be installed between the friction plate 31 and the moving component 2 (or in the space between the elastic preload component 30 and the stationary component 1 or the moving component 2). Through the high elasticity and damping properties of its polymer material, it effectively absorbs and disperses the noise and vibration generated during the relative movement between the friction plate 31 and the moving component 2. This improves the operational stability of the drive device and reduces the overall operating noise.

[0038] Furthermore, the noise-reducing flexible component 4 is made of polymer materials, which possess excellent mechanical damping properties and sound absorption and noise reduction effects. Polymer materials typically have high elastic modulus and energy absorption capacity, such as silicone, which can convert mechanical energy into heat energy and gradually dissipate it during the operation of the piezoelectric drive device, thereby effectively suppressing noise generation.

[0039] like Figure 2 As shown, the piezoelectric drive assembly 3 also includes a piezoelectric vibrator 32 and friction protrusions 33 fixed or integrally formed on the piezoelectric vibrator 32. The aforementioned elastic preload member 30 will always provide pressure to the piezoelectric vibrator 32 pointing towards the friction plate 31, so that the friction protrusions 33 fixed on the piezoelectric vibrator 32 contact the friction plate 31. The piezoelectric vibrator 32 is composed of a cuboid piezoelectric ceramic and a protrusion. A schematic diagram of the piezoelectric ceramic is shown below. Figure 10 As shown in the diagram, piezoelectric ceramics are divided into two regions, positive and negative, as shown in region A and region B respectively.

[0040] The working principle is that when a voltage is applied to the piezoelectric vibrator 32, the piezoelectric vibrator 32 will undergo the following... Figure 11 The bending deformation shown. This deformation drives the friction protrusions 33 fixed on the piezoelectric vibrator 32 to generate relative motion, thereby driving the friction plate 31 to generate relative motion.

[0041] In the prior art, when the elastic preload element 30 and the friction plate 31 of the piezoelectric motor are not the same component, such as Figure 4 As shown. Due to the presence of the elastic preload 30, when the piezoelectric vibrator 32 is working, the impact friction between the friction protrusion 33 and the friction plate 31 will generate mechanical noise. The simulation results are as follows. Figure 8 As shown. Furthermore, when the piezoelectric drive assembly 3 moves, the piezoelectric vibrator 32 itself vibrates. This vibration is transmitted to components rigidly connected to it, such as the elastic preload member 30 and stationary member 1 or the elastic preload member 30 and moving member 2 mentioned above, causing these components to produce minute vibrational displacements, thereby generating vibration noise, such as... Figure 6 and Figure 7Taking the TULA resonator structure piezoelectric motor as an example, the piezoelectric drive assembly 3 includes an elastic preload 30, a piezoelectric vibrator 32, and a friction plate 31. The piezoelectric vibrator 32 is connected to the stationary component, and the elastic preload 30 and the friction plate 31 are both connected to the moving component 2. The elastic preload 30 presses the piezoelectric vibrator 32 against the friction plate 31. A noise reduction flexible component 4 is provided between the elastic preload 30 and the moving component 2, and / or a noise reduction flexible component 4 is provided between the friction plate 31 and the moving component 2.

[0042] like Figure 6 The elastic preload 30 of the TULA shown is connected to the moving part 2 by thermal riveting, and the elastic preload 30 and the friction plate 31 are fixedly connected as a whole. When the TULA is powered on, the elastic preload 30 on the carbon rod holding the piezoelectric vibrator 32 will also vibrate. The spring vibration cloud diagram is shown below. Figure 7 As shown. If the elastic preload 30 is connected to the moving member 2, the edge of the elastic preload 30 will continuously collide with the moving member 2 assembly due to vibration, thereby generating noise. The vibration energy is calculated as follows: Q = 1 / 2 × k × A 2 In the formula, Q Vibrational energy, k For system stiffness, A The amplitude is denoted as 4. The noise-reducing flexible component 4 can effectively suppress vibration and noise during the piezoelectric drive process. This design, by setting the noise-reducing flexible component 4 between the elastic preload component 30 and the moving component 2, and / or between the friction plate 31 and the moving component, can effectively reduce vibration transmission and noise generation. The noise-reducing flexible component 4 can absorb or disperse vibration energy, thereby reducing the overall vibration and noise level of the device.

[0043] Furthermore, the elastic preload 30 is aligned and connected to the fixed part 1 or the moving part 2 through a positioning structure. At least part of the positioning structure is provided on the fixed part 1 or the moving part 2, and the remaining part is provided on the elastic preload 30. In this embodiment, the positioning structure is a concave-convex structure. The positioning structure includes a positioning hole 50 and a positioning pin 51 inserted in the positioning hole 50. For ease of processing, in this embodiment, the positioning hole 50 is designed to be fixed to the above-mentioned elastic preload 30, and the positioning pin 51 is fixedly provided on the above-mentioned fixed part 1 or the moving part 2. Example 2

[0044] 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 device described in Embodiment 1, this embodiment describes a second type of piezoelectric drive device.

[0045] like Figure 3As shown, a piezoelectric drive device includes a stationary member 1, a moving member 2, and a piezoelectric drive assembly 3 that drives the moving member 2 to move relative to the stationary member 1 along a first axis Z. The elastic preload 30 of the piezoelectric drive assembly 3 is fixed to the stationary member 1 or the elastic preload 30 is fixed to the moving member 2.

[0046] The elastic preload 30 and the stationary component 1 are connected by a noise-reducing flexible component 4, or the elastic preload 30 and the moving component 2 are connected by a noise-reducing flexible component 4, to ensure that they reduce noise by absorbing vibration and reducing friction. Example 3

[0047] 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 device described in Embodiment 1, this embodiment describes a third type of piezoelectric drive device.

[0048] like Figure 1 As shown, a piezoelectric drive device includes a stationary component 1, a moving component 2, and a piezoelectric drive assembly 3 that drives the moving component 2 to move relative to the stationary component 1 along a first axis Z. The friction plate 31 of the piezoelectric drive assembly 3 is fixed to the moving component 2. The moving component 2 and the friction plate 31 are connected by a noise-reducing flexible component 4, so that when the friction plate 31 is impacted, the noise-reducing flexible component 4 effectively suppresses the vibration and noise during the piezoelectric drive process, realizing applications in noise-sensitive terminals such as mobile phone autofocus motors. Example 4

[0049] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that, for the piezoelectric driving device of Embodiment 1, the camera module of this embodiment includes a piezoelectric driving device.

[0050] 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. Example 5

[0051] The structure and principle of this embodiment are basically the same as those of embodiment four. The difference is that, in relation to the camera module of embodiment four, the electronic device in this embodiment includes a camera module.

[0052] like Figure 12 As shown, 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.

[0053] 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 device, comprising a moving member, a stationary member, and a piezoelectric drive assembly (3) for driving the moving member to move relative to the stationary member, characterized in that, At least a portion of the piezoelectric drive assembly (3) is connected to the moving member, and at least another portion is connected to the stationary member; a noise-reducing flexible member (4) is provided between the piezoelectric drive assembly (3) and the stationary member, and / or a noise-reducing flexible member (4) is provided between the piezoelectric drive assembly (3) and the moving member.

2. The piezoelectric drive device according to claim 1, characterized in that, The piezoelectric drive assembly (3) includes an elastic preload member (30), a piezoelectric vibrator (32), and a friction plate (31). The elastic preload member (30) abuts the piezoelectric vibrator (32) against the friction plate (31). The elastic preload member (30) is connected to a stationary member, and the friction plate (31) is connected to a moving member. A noise reduction flexible member (4) is provided between the elastic preload member (30) and the stationary member, and / or a noise reduction flexible member (4) is provided between the friction plate (31) and the moving member.

3. The piezoelectric drive device according to claim 1, characterized in that, The piezoelectric drive assembly (3) includes an elastic preload member (30), a piezoelectric vibrator (32), and a friction plate (31). The piezoelectric vibrator (32) is connected to a stationary member. The elastic preload member (30) and the friction plate (31) are both connected to a moving member. The elastic preload member (30) abuts the piezoelectric vibrator (32) against the friction plate (31). A noise-reducing flexible member (4) is provided between the elastic preload member (30) and the moving member, and / or a noise-reducing flexible member (4) is provided between the friction plate (31) and the moving member.

4. The piezoelectric drive device according to claim 3, characterized in that, The elastic preload (30) and friction plate (31) are fixedly connected or integrally set.

5. A piezoelectric drive device according to claim 2, characterized in that, The piezoelectric vibrator (32) is provided with a friction bulge that abuts against the friction plate (31).

6. A piezoelectric drive device according to any one of claims 1-5, characterized in that, The noise-reducing flexible component (4) is made of polymer material.

7. A piezoelectric drive device according to any one of claims 1-5, characterized in that, The noise-reducing flexible component (4) is in the form of a sheet or a block.

8. A piezoelectric drive device according to any one of claims 2-3, characterized in that, The elastic preload (30) is aligned and connected to the fixed member or the moving member through a positioning structure. At least part of the positioning structure is provided on the fixed member or the moving member, and the remaining part is provided on the elastic preload (30).

9. A camera module, characterized in that, The camera module includes a piezoelectric drive device 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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