Camera module

Abstract

A camera module is disclosed, comprising: a photosensitive component, a lens component held on a photosensitive path of the photosensitive component, the lens component being provided with an optical axis, and a driving component comprising: a first supporting frame, a first driving element and a first pre-stressing component, wherein the photosensitive component is mounted on the first supporting frame, the first driving element being implemented as a piezoelectric actuator, wherein the first driving element is frictionally coupled to the first supporting frame through the first pre-stressing component and is configured to move in a two-dimensional trajectory in a plane perpendicular to the optical axis in a manner of bending vibration along two directions after being driven, and to move in a first direction, thereby driving the first supporting frame by friction to drive the photosensitive component to move in the first direction in a plane perpendicular to the optical axis for optical image stabilization.

Description

Technical Field

[0001] The present application relates to the field of camera modules, and more particularly to a camera module that utilizes a novel piezoelectric actuator as a driving element to meet the optical image stabilization requirements of the camera module. Furthermore, the piezoelectric actuator is disposed within the camera module using a reasonable layout scheme to further meet the structural and dimensional requirements of the camera module. Background Art

[0002] With the popularization of mobile electronic devices, the relevant technologies of camera modules used in mobile electronic devices to help users obtain images (for example, videos or pictures) have developed and progressed rapidly. In recent years, camera modules have been widely used in many fields such as medical care, security, and industrial production.

[0003] To meet increasingly broad market demands, camera modules are increasingly moving towards higher pixels, larger chips, and smaller sizes. As photosensitive chips evolve towards higher pixels and larger chips, the size of the optical components they support (e.g., filters and lenses) is also increasing. This poses new challenges to the drivers used to control optical performance (e.g., focusing and image stabilization).

[0004] Specifically, the existing driving elements for driving optical components are electromagnetic motors, such as voice coil motors (VCMs) and shape memory alloy actuators (SMAs). However, as the size of optical components increases and the weight increases, existing electromagnetic motors are gradually unable to provide sufficient driving force to drive the optical components to move. Quantitatively speaking, existing voice coil motors and shape memory alloy actuators are only suitable for driving optical components weighing less than 100mg. That is, if the weight of the optical component exceeds 100mg, the existing actuators will not be able to meet the application requirements of the camera module.

[0005] Furthermore, as mobile devices become increasingly smaller and thinner, the density of components within the driver element is also increasing. Consequently, existing voice coil motors (VCMs) contain coils and magnets. When the two magnets are too close together (less than 7mm), their internal magnetic fields interact, causing the magnets to shift or vibrate, reducing the stability of the driver control.

[0006] Therefore, a new driving solution suitable for the camera module is needed, and the new driver can not only meet the driving requirements of the camera module for optical performance adjustment, but also meet the development needs of lightweight and thin camera modules. Summary of the Invention

[0007] One advantage of the present application is that it provides a camera module, wherein the camera module adopts a new type of piezoelectric actuator as a driving element to not only provide a sufficiently large driving force, but also provide a driving performance with higher precision and longer stroke to meet the requirements of optical performance adjustment of the camera module, such as optical image stabilization.

[0008] Another advantage of the present application is that it provides a camera module, wherein the piezoelectric actuator has a relatively small size to better adapt to the development trend of lightweight and thin camera modules.

[0009] Another advantage of the present application is that it provides a camera module, wherein the piezoelectric actuator is arranged in the camera module using a reasonable layout scheme to meet the structural and size requirements of the camera module.

[0010] Other advantages and features of the present application will become apparent from the following description, and may be achieved by means of the instruments and combinations particularly pointed out in the claims.

[0011] To achieve at least one of the above advantages, the present application provides a camera module, comprising:

[0012] The photosensitive component comprises: a circuit board and a photosensitive chip electrically connected to the circuit board;

[0013] A lens assembly held on the light-sensing path of the light-sensing component comprises: a lens carrier and an optical lens mounted on the lens carrier, wherein the optical lens has an optical axis; and

[0014] A driving assembly includes: a first carrying frame, a first driving element and a first pre-stressing component, wherein the photosensitive component is mounted on the first carrying frame, and the first driving element is implemented as a piezoelectric actuator, wherein the first driving element is frictionally coupled to the first carrying frame through the first pre-stressing component and is configured to move along a first direction in a two-dimensional trajectory in a plane perpendicular to the optical axis in a manner of bending vibration along two directions after being driven, so as to drive the first carrying frame by friction to drive the photosensitive component to move in the first direction in a plane perpendicular to the optical axis for optical image stabilization.

[0015] In the camera module according to the present application, the driving component further includes a second supporting frame, a second driving element and a second pre-stressing component, wherein the second supporting frame is external to the first supporting frame, and the second driving element is implemented as a piezoelectric actuator, wherein the second driving element is frictionally coupled to the second supporting frame through the second pre-stressing part and is configured to move along a second direction in a plane perpendicular to the optical axis in a two-dimensional trajectory in a manner of bending vibration along two directions after being driven, so as to drive the second supporting frame by friction to drive the first supporting frame to drive the photosensitive component to move in the second direction in a plane perpendicular to the optical axis for optical image stabilization, and the first direction is perpendicular to the second direction.

[0016] In the camera module according to the present application, the piezoelectric actuator includes: an actuation system and a driving circuit system, wherein the actuation system moves in a two-dimensional trajectory along a preset direction in a manner of bending vibration in two directions under the control of the driving circuit system.

[0017] In the camera module according to the present application, the actuation system includes: a piezoelectric plate structure and a friction driving part fixed to the piezoelectric plate structure, and the friction driving part is frictionally coupled to the first supporting frame or the second supporting frame.

[0018] In the camera module according to the present application, the piezoelectric plate structure has a first side surface extending along its depth direction and a second side surface extending along its height direction and adjacent to the first side surface, wherein the piezoelectric plate structure has a first resonant frequency along its depth direction and a second resonant frequency along its height direction, wherein the second resonant frequency is greater than the first resonant frequency.

[0019] In the camera module according to the present application, the piezoelectric plate structure includes a first piezoelectric region, a second piezoelectric region and a third piezoelectric region formed on the second side surface, and a fourth piezoelectric region formed on the first side surface, wherein the second piezoelectric region is located between the first piezoelectric region and the third piezoelectric region, and the fourth piezoelectric region is adjacent to the second piezoelectric region; wherein the piezoelectric plate structure further includes a first electrode pair electrically connected to the first piezoelectric region, a second electrode pair electrically connected to the second piezoelectric region, a third electrode pair electrically connected to the third piezoelectric region and a fourth electrode pair electrically connected to the fourth electrically connected region.

[0020] In the camera module according to the present application, the driving circuit system includes a first driving circuit and a second driving circuit, the first driving circuit is electrically connected to the first electrode pair and the third electrode pair, and the second driving circuit is electrically connected to the second electrode pair and the fourth electrode pair; wherein the vibration frequency of the circuit vibration signal output by the first driving circuit and the second driving circuit is equal to the first resonant frequency or the second resonant frequency.

[0021] In the camera module according to the present application, when the vibration frequency of the circuit vibration signal output by the first driving circuit is the first resonant frequency, the piezoelectric plate structure resonates in its height direction and partially resonates in its depth direction, so that the piezoelectric plate structure moves in a two-dimensional trajectory along the preset direction in a manner of bending vibration along two directions; wherein, when the vibration frequency of the circuit vibration signal input by the second driving circuit is the second resonant frequency, the piezoelectric plate structure resonates in its depth direction and partially resonates in its height direction, so that the piezoelectric plate structure moves in a two-dimensional trajectory along the preset direction in a manner of bending vibration along two directions.

[0022] In the camera module according to the present application, the driving assembly further includes a first friction actuating part and a second friction actuating part, the first friction actuating part is clamped between the first driving element and the first supporting frame, so that the first driving element is frictionally coupled to the first supporting frame through the first friction actuating part and the first pre-pressing part; the second friction actuating part is clamped between the second driving element and the second supporting frame, so that the second driving element is frictionally coupled to the second supporting frame through the second pre-pressing part and the second friction actuating part.

[0023] In the camera module according to the present application, the first driving element is located on the side of the first supporting frame.

[0024] In the camera module according to the present application, the first driving element is located on the upper part of the first supporting frame.

[0025] In the camera module according to the present application, the first driving element is located at the lower part of the first supporting frame.

[0026] In the camera module according to the present application, the driving assembly is further externally arranged on the outer frame of the second supporting frame, wherein the second driving element is clamped between the second supporting frame and the outer frame through the second pre-pressing component and the second friction actuating part. In this way, the second driving element is frictionally coupled to the second supporting frame, wherein the second driving element is located on the side of the second supporting frame.

[0027] In the camera module according to the present application, the driving assembly is further externally arranged on the outer frame of the second supporting frame, wherein the second driving element is clamped between the second supporting frame and the lens carrier through the second pre-pressing component and the second friction actuating part. In this way, the second driving element is frictionally coupled to the second supporting frame, wherein the second driving element is located at the upper part of the second supporting frame.

[0028] In the camera module according to the present application, the driving component is further externally arranged on the outer frame of the second supporting frame, wherein the second driving element is clamped between the second supporting frame and the outer frame through the second pre-pressing component and the second friction actuating part. In this way, the second driving element is frictionally coupled to the second supporting frame, wherein the second driving element is located at the lower part of the second supporting frame.

[0029] In the camera module according to the present application, the driving assembly further includes a first guiding mechanism arranged between the first supporting frame and the second supporting frame and a second guiding mechanism arranged between the second supporting frame and the outer frame.

[0030] In the camera module according to the present application, the driving assembly further includes a first guiding mechanism arranged between the first supporting frame and the second supporting frame, and a second guiding mechanism arranged between the second supporting frame and the lens carrier.

[0031] In the camera module according to the present application, the driving assembly further includes a first guiding mechanism arranged between the first supporting frame and the second supporting frame and a second guiding mechanism arranged between the second supporting frame and the outer frame.

[0032] In the camera module according to the present application, the first pre-stressing component includes a first elastic element, which is arranged between the piezoelectric plate structure of the first driving element and the second supporting frame, so that the friction driving part of the first driving element is forced to press against the first friction actuating part by the elastic force of the first elastic element, and the first driving element is frictionally coupled to the first supporting frame in this way; the second pre-stressing element includes a second elastic element, which is arranged between the piezoelectric plate structure of the second driving element and the outer frame, so that the friction driving part of the second driving element is forced to press against the second friction actuating part by the elastic force of the second elastic element, and the second driving element is frictionally coupled to the second supporting frame in this way.

[0033] In the camera module according to the present application, the first pre-stressing component includes a first elastic element, which is arranged between the piezoelectric plate structure of the first driving element and the second supporting frame, so that the friction driving part of the first driving element is forced to press against the first friction actuating part by the elastic force of the first elastic element, and the first driving element is frictionally coupled to the first supporting frame in this way; the second pre-stressing element includes a second elastic element, which is arranged between the piezoelectric plate structure of the second driving element and the lens carrier, so that the friction driving part of the second driving element is forced to press against the second friction actuating part by the elastic force of the second elastic element, and the second driving element is frictionally coupled to the second supporting frame in this way.

[0034] In the camera module according to the present application, the first pre-stressing component includes a first elastic element, which is arranged between the piezoelectric plate structure of the first driving element and the second supporting frame, so that the friction driving part of the first driving element is forced to press against the first friction actuating part by the elastic force of the first elastic element, and the first driving element is frictionally coupled to the first supporting frame in this way; the second pre-stressing element includes a second elastic element, which is arranged between the piezoelectric plate structure of the second driving element and the outer frame, so that the friction driving part of the second driving element is forced to press against the second friction actuating part by the elastic force of the second elastic element, and the second driving element is frictionally coupled to the second supporting frame in this way.

[0035] In the camera module according to the present application, the first elastic element and the second elastic element are implemented as elastic adhesives.

[0036] In the camera module according to the present application, the thickness of the first elastic element and the second elastic element is between 10um and 50um.

[0037] In the camera module according to the present application, the first pre-stressing component includes a first magnetic element arranged on the first supporting frame and a second magnetic element arranged on the second supporting frame and corresponding to the first magnetic element, so that the friction driving part of the first driving element is forced to press against the first friction actuating part through the magnetic action between the first magnetic element and the second magnetic element, and the first driving element is frictionally coupled to the first supporting frame in this way; the second pre-stressing component includes a third magnetic element arranged on the second supporting frame and a fourth magnetic element arranged on the outer frame and corresponding to the third magnetic element, so that the friction driving part of the second driving element is forced to press against the second friction actuating part through the magnetic action between the third magnetic element and the fourth magnetic element, and the second driving element is frictionally coupled to the second supporting frame in this way.

[0038] In the camera module according to the present application, the first pre-stressing component includes a first magnetic element arranged on the first supporting frame and a second magnetic element arranged on the second supporting frame and corresponding to the first magnetic element, so that the friction driving part of the first driving element is forced to press against the first friction actuating part through the magnetic action between the first magnetic element and the second magnetic element, and the first driving element is frictionally coupled to the first supporting frame in this way; the second pre-stressing component includes a third magnetic element arranged on the second supporting frame and a fourth magnetic element arranged on the lens carrier and corresponding to the third magnetic element, so that the friction driving part of the second driving element is forced to press against the second friction actuating part through the magnetic action between the third magnetic element and the fourth magnetic element, and the second driving element is frictionally coupled to the second supporting frame in this way.

[0039] In the camera module according to the present application, the first pre-stressing component includes a first magnetic element arranged on the first supporting frame and a second magnetic element arranged on the second supporting frame and corresponding to the first magnetic element, so that the friction driving part of the first driving element is forced to press against the first friction actuating part through the magnetic action between the first magnetic element and the second magnetic element, and the first driving element is frictionally coupled to the first supporting frame in this way; the second pre-stressing component includes a third magnetic element arranged on the second supporting frame and a fourth magnetic element arranged on the outer frame and corresponding to the third magnetic element, so that the friction driving part of the second driving element is forced to press against the second friction actuating part through the magnetic action between the third magnetic element and the fourth magnetic element, and the second driving element is frictionally coupled to the second supporting frame in this way.

[0040] Further objectives and advantages of the present application will be fully reflected through understanding of the following description and drawings.

[0041] These and other objects, features and advantages of the present application are fully reflected in the following detailed description, drawings and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and other purposes, features, and advantages of the present application will become more apparent through a more detailed description of the embodiments of the present application in conjunction with the accompanying drawings. The accompanying drawings are intended to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0043] Figure 1 The figure shows a schematic diagram of a camera module according to an embodiment of the present application.

[0044] Figure 2 The figure shows a schematic diagram of the photosensitive component of the camera module according to an embodiment of the present application.

[0045] Figure 3 Another schematic diagram of the camera module according to an embodiment of the present application is shown.

[0046] Figure 4A FIG2 shows a schematic diagram of a piezoelectric actuator according to an embodiment of the application.

[0047] Figure 4B FIG2 is a schematic diagram illustrating a piezoelectric plate structure of the piezoelectric actuator according to an embodiment of the present application.

[0048] Figure 4C FIG2 is a schematic diagram of a driving circuit system of the piezoelectric actuator according to an embodiment of the present application.

[0049] Figures 4D to 4F FIG2 is a schematic diagram illustrating the piezoelectric actuator moving in a first mode according to an embodiment of the present application.

[0050] Figures 4G to 4I FIG2 is a schematic diagram illustrating the piezoelectric actuator moving in the second mode according to an embodiment of the present application.

[0051] Figure 4J FIG2 shows another schematic diagram of the piezoelectric plate structure of the piezoelectric actuator according to an embodiment of the present application.

[0052] Figure 4K FIG2 is a schematic diagram illustrating the piezoelectric actuator according to an embodiment of the present application acting on a moved object.

[0053] Figure 4LFIG2 shows a schematic diagram of the movement of the piezoelectric actuator according to an embodiment of the present application.

[0054] Figure 5 The figure shows a schematic diagram of a modified implementation of the camera module according to an embodiment of the present application.

[0055] Figure 6 The figure shows a schematic diagram of another modified embodiment of the camera module according to the embodiment of the present application.

[0056] Figure 7 A schematic diagram of another variant implementation of the camera module according to an embodiment of the present application is shown.

[0057] Figure 8 The figure shows a schematic diagram of another modified implementation of the camera module according to the embodiment of the present application. DETAILED DESCRIPTION

[0058] Below, the exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the exemplary embodiments described herein.

[0059] Exemplary camera module

[0060] like Figure 1 As shown, a camera module according to an embodiment of the present application is illustrated, which includes: a photosensitive component 10, a lens component 20 held on the light-sensitive path of the photosensitive component 10, and a driving component 40 for driving the photosensitive component 10 to perform optical image stabilization.

[0061] Accordingly, the lens assembly 20 includes a lens carrier 21 and an optical lens 22 mounted on the lens carrier 21. In this embodiment, the optical lens 22 includes a lens barrel and at least one optical lens mounted in the lens barrel. Those skilled in the art should know that the resolving power of the optical lens 22 is proportional to the number of optical lenses within a certain range, that is, the higher the resolving power, the greater the number of optical lenses. In a specific implementation, the optical lens 22 can be implemented as an integrated lens or a split lens, wherein, when the optical lens 22 is implemented as an integrated lens, the optical lens 22 includes a lens barrel, and all the optical lenses are mounted in the lens barrel; and when the optical lens 22 is implemented as a split optical lens, the optical lens 22 is assembled from at least two lens monomers.

[0062] Furthermore, in this embodiment, the lens carrier 21 is a fixed carrier, that is, when the optical lens 22 is mounted on the lens carrier 21, the relative positional relationship between the lens carrier 21 and the optical lens 22 does not change. It should be understood that in other examples of the present application, the lens carrier 21 can also be implemented as a drive carrier to change the relative positional relationship between the optical lens 22 and the photosensitive component 10 by the drive carrier to perform autofocus, and this is not limited to the present application.

[0063] like Figure 2 As shown, in this embodiment, the photosensitive component 10 includes a circuit board 11, a photosensitive chip 12 electrically connected to the circuit board 11, and a filter element 13 held on the photosensitive path of the photosensitive chip 12, wherein the circuit board 11 forms a mounting substrate for the photosensitive component 10. The circuit board can be implemented as a printed circuit board (PCB), a software board, or a reinforced flexible printed circuit (PFC). In addition, in some examples, a reinforcement plate (not shown) can be provided below the circuit board 11. For example, a steel sheet can be provided below the circuit board to strengthen the strength of the circuit board and improve the heat dissipation performance of the photosensitive component through the steel sheet.

[0064] Furthermore, in Figure 2 In the illustrated example, the photosensitive component 10 further includes a bracket 14 provided on the circuit board 11, wherein the filter element 13 is mounted on the bracket 14 to be maintained on the photosensitive path of the photosensitive chip 12. In other examples of the present application, the specific implementation method of the filter element 13 being maintained on the photosensitive path of the photosensitive chip 12 is not limited to the present application. For example, the filter element 13 can be implemented as a filter film and coated on the surface of an optical lens of the lens group to achieve a filtering effect. For another example, the photosensitive component 10 can further include a filter element bracket (not shown) mounted on the bracket 14, wherein the filter element 13 is maintained on the photosensitive path of the photosensitive chip 12 by being mounted on the filter element bracket.

[0065] In a specific example of the embodiment of the present application, the bracket 14 can be implemented as a plastic bracket, which is attached to the circuit board 11 by an adhesive. In other examples of the embodiment of the present application, the bracket 14 can also be implemented as an integrated bracket integrally formed with the circuit board 11, such as a molded bracket, which is not limited to this application.

[0066] As previously mentioned, to meet increasingly broad market demands, high pixels, large chips, and small sizes are the irreversible development trend of existing camera modules. As photosensitive chips evolve toward higher pixels and larger chips, the size of the optical components (e.g., filters, optical lenses) that adapt to these chips is also gradually increasing. This presents new challenges for the drivers used to drive these optical components for optical performance adjustments (e.g., optical focus, optical image stabilization, etc.).

[0067] Specifically, the existing driving elements for driving optical components are electromagnetic motors, such as voice coil motors (VCMs) and shape memory alloy actuators (SMAs). However, as the size of optical components increases and the weight increases, existing electromagnetic motors are gradually unable to provide sufficient driving force to drive the optical components to move. Quantitatively speaking, existing voice coil motors and shape memory alloy actuators are only suitable for driving optical components weighing less than 100mg. That is, if the weight of the optical component exceeds 100mg, the existing actuators will not be able to meet the application requirements of the camera module.

[0068] Furthermore, as mobile devices become increasingly smaller and thinner, the density of components within the driver element is also increasing. Consequently, existing voice coil motors (VCMs) contain coils and magnets. When the two magnets are too close together (less than 7mm), their internal magnetic fields interact, causing the magnets to shift or vibrate, reducing the stability of the driver control.

[0069] Therefore, a new driving solution suitable for the camera module is needed, and the new driver can not only meet the driving requirements of the camera module for optical performance adjustment, but also meet the development needs of lightweight and thin camera modules.

[0070] Specifically, for camera modules, new drivers must meet the following requirements: relatively greater driving force and improved driving performance (specifically, higher-precision drive control and longer drive travel). Furthermore, in addition to finding a driver that meets the requirements of the new technology, the selection of a new driver must also consider its adaptability to the current trend of lightweight and thinner camera modules.

[0071] After research and testing, this application proposes a piezoelectric actuator with a novel structure that meets the technical requirements of the camera module for a driver. Furthermore, the piezoelectric actuator is appropriately positioned within the camera module to meet the structural and dimensional design requirements of the camera module.

[0072] Figures 4A to 4L FIG2 shows a schematic diagram of a piezoelectric actuator according to an embodiment of the application. Figure 4A As shown, the piezoelectric actuator 100 according to an embodiment of the present application includes an actuation system 110 and a drive circuit system 120. Under the control of the drive circuit system 120, the actuation system 110 moves along a two-dimensional trajectory along a preset direction in a manner of bending vibration along two directions. In particular, in this embodiment, the piezoelectric actuator 100 is a highly efficient semi-resonant drive system. When turned on, the actuation system 110 of the piezoelectric actuator 100 moves along a two-dimensional trajectory along a preset direction in a manner of bending vibration along two directions, thereby frictionally coupling and moving the object along the preset direction.

[0073] like Figure 4A As shown in FIG. 1 , in this embodiment, the actuation system 110 includes a piezoelectric plate structure 111 and a friction drive unit 112 fixed to the piezoelectric plate structure 111. Here, the piezoelectric plate structure 111 may be symmetrical or asymmetrical. The piezoelectric plate structure 111 has a first side surface extending along its depth direction and a second side surface extending along its height direction and adjacent to the first side surface, wherein the piezoelectric plate structure 111 extends along its depth direction (e.g., Figure 4A D) has a first resonant frequency and along its height direction (e.g., as Figure 4A Typically, the height dimension of the piezoelectric plate structure 111 is greater than its depth dimension, that is, the second resonant frequency is greater than the first resonant frequency.

[0074] like Figure 4B As shown, in this embodiment, the piezoelectric plate structure 111 includes at least one piezoelectric layer formed together. The thickness of the piezoelectric plate structure 111 ranges from 5um to 40um. In particular, in the embodiment of the present application, the at least one piezoelectric layer structure can be a single piezoelectric layer, or it can include multiple piezoelectric layers stacked together (for example, multiple parallel piezoelectric layers co-fired together). Here, compared with a single piezoelectric layer, multiple piezoelectric layers can achieve similar effects under the premise of applying a smaller voltage.

[0075] like Figure 4AAs shown, in this embodiment, the piezoelectric plate structure 111 includes a first piezoelectric region 1111, a second piezoelectric region 1112, and a third piezoelectric region 1113 formed on the second side surface, and a fourth piezoelectric region 1114 formed on the first side surface, wherein the second piezoelectric region 1112 is located between the first piezoelectric region 1111 and the third piezoelectric region 1113, and the fourth piezoelectric region 1114 is adjacent to the second piezoelectric region 1112. In addition, the piezoelectric plate structure 111 further includes a first electrode pair 1115 electrically connected to the first piezoelectric region 1111, a second electrode pair 1116 electrically connected to the second piezoelectric region 1112, a third electrode pair 1117 electrically connected to the third piezoelectric region 1113, and a fourth electrode pair 1118 electrically connected to the fourth piezoelectric region 1114. That is, in the embodiment shown in FIG. Figure 1 In the illustrated example, the piezoelectric plate structure 111 includes four piezoelectric regions and four electrode pairs electrically connected to the four piezoelectric regions. Of course, in other examples of the present application, the piezoelectric plate structure 111 may include other numbers of piezoelectric regions and electrode pairs, and this is not limited to the present application.

[0076] Furthermore, in some other examples of the present application, one of the first piezoelectric region 1111 and the third piezoelectric region 1113, and / or one of the second piezoelectric region 1112 and the fourth piezoelectric region 1114 can be passive, which can reduce the driving amplitude but does not change the operation of the actuation system 110.

[0077] Furthermore, in the embodiment of the present application, the first piezoelectric region 1111, the second piezoelectric region 1112, the third piezoelectric region 1113, and the fourth piezoelectric region 1114 have polarities generated by polarization during the manufacturing process, thereby forming positive and negative electrodes. Specifically, the first piezoelectric region 1111 is polarized during the manufacturing process so that one electrode of the first electrode pair 1115 corresponding to the first piezoelectric region 1111 forms a negative electrode (for example, Figure 4A A-), the other electrode forms the positive electrode (e.g., Figure 4A The third piezoelectric region 1113 is polarized during the manufacturing process so that one electrode of the third electrode pair 1117 corresponding to the third piezoelectric region 1113 forms a negative electrode (for example, Figure 4A The other electrode forms the positive electrode (e.g., Figure 4A The second piezoelectric region 1112 is polarized during the manufacturing process so that one electrode of the second electrode pair 1116 corresponding to the second piezoelectric region 1112 forms a negative electrode (for example, Figure 4AThe other electrode forms the positive electrode (e.g., Figure 4A The fourth piezoelectric region 1114 is polarized during the manufacturing process so that one electrode of the fourth electrode pair 1118 corresponding to the fourth piezoelectric region 1114 forms a negative electrode (for example, Figure 4A The other electrode forms the positive electrode (e.g., Figure 4A It should be noted that in this embodiment, each electrode in the first electrode pair 1115 and / or the second electrode pair 1116 and / or the third electrode pair 1117 and / or the second electrode pair 1116 has an "L" shape.

[0078] like Figure 4A and Figure 4B As shown, in this embodiment, one electrode of the first electrode pair 1115 is coupled to and interlaced with an internal electrode of each piezoelectric layer of the first piezoelectric region 1111, and the other electrode of the first electrode pair 1115 is interlacedly connected to an internal electrode of the first piezoelectric region 1111 opposite to each piezoelectric layer. During the polarization process, one electrode of the first electrode pair 1115 is determined as a positive electrode, and the other electrode is determined as a negative electrode. One electrode of the second electrode pair 1116 is coupled to and interlaced with an internal electrode of each piezoelectric layer of the second piezoelectric region 1112, and the other electrode of the second electrode pair 1116 is interlacedly connected to an internal electrode of the second piezoelectric region 1112 opposite to each piezoelectric layer. During the polarization process, one electrode of the second electrode pair 1116 is determined as a positive electrode, and the other electrode is determined as a negative electrode. One electrode of the third electrode pair 1117 is coupled to and interlaced with an internal electrode of each piezoelectric layer of the third piezoelectric region 1113, and the other electrode of the third electrode pair 1117 is interlaced with the internal electrode of the third piezoelectric region 1113 opposite each piezoelectric layer. During polarization, one electrode of the third electrode pair 1117 is determined as a positive electrode, and the other electrode is determined as a negative electrode. One electrode of the third electrode pair 1117 is coupled to and interlaced with an internal electrode of each piezoelectric layer of the third piezoelectric region 1113, and the other electrode of the third electrode pair 1117 is interlaced with the internal electrode of the third piezoelectric region 1113 opposite each piezoelectric layer. During polarization, one electrode of the third electrode pair 1117 is determined as a positive electrode, and the other electrode is determined as a negative electrode.

[0079] Further references Figure 4AIn this embodiment, the driving circuit system 120 includes a first driving circuit 121 and a second driving circuit 122, wherein the first driving circuit 121 is electrically connected to the first electrode pair 1115 and the third electrode pair 1117, and the second driving circuit 122 is electrically connected to the second electrode pair 1116 and the fourth electrode pair 1118, wherein the first driving circuit 121 and the second driving circuit 122 can be full-bridge driving circuits or other driving circuits. In particular, in this embodiment, the driving circuit system 120 has four output circuit vibration signals: 124(1)-124(4), wherein the output circuit vibration signals can be as follows: Figure 3 The ultrasonic square wave vibration signal shown may also be other signals, for example, a sinusoidal signal.

[0080] During operation of the piezoelectric actuator 100, the piezoelectric plate structure 111 has two bending modes: Mode 1 and Mode 2, wherein Mode 1 and Mode 2 each have a different resonant frequency. The vibration amplitude of the bending mode of the piezoelectric plate structure 111 depends on the vibration frequency of the output circuit vibration signal. Specifically, when the driving circuit system 120 applies a circuit vibration signal to the piezoelectric plate structure 111 at the resonant frequency for one of the two bending modes (for example, the resonant frequency of Mode 1), the vibration amplitude of the bending mode operating at its resonant frequency is fully amplified, and the vibration amplitude of the other bending modes operating at partial resonance is only partially amplified. More specifically, when the vibration frequency of the circuit vibration signal output by the first driving circuit 121 is the first resonant frequency, the piezoelectric plate structure 111 resonates in its height direction and partially resonates in its depth direction, so that the piezoelectric plate structure 111 moves in a two-dimensional trajectory along a preset direction in a manner of bending vibration along two directions; wherein, when the vibration frequency of the circuit vibration signal input by the second driving circuit 122 is the second resonant frequency, the piezoelectric plate structure 111 resonates in its depth direction and partially resonates in its height direction, so that the piezoelectric plate structure 111 moves in a two-dimensional trajectory along a preset direction in a manner of bending vibration along two directions.

[0081] More specifically, in Figure 4A and Figure 4CIn the illustrated example, the first drive circuit 121 and the second drive circuit 122 are capable of outputting four circuit vibration signals: 124(1)-124(4). In this embodiment, the voltage of the circuit vibration signal is 2.8V, and each of the four vibration signals has a vibration frequency that is substantially equal to the resonant frequency of any one of the two bending modes of the piezoelectric plate structure 111, that is, the vibration frequency is substantially equal to the first resonant frequency or the second resonant frequency. In addition, the circuit vibration signals from the outputs 124(1)-124(2) are phase-shifted by the drive circuit system 120 by approximately 0 degrees to 90 degrees relative to the circuit vibration signals from the outputs 124(3)-124(4), thereby exclusively moving in one of the two directions. When the drive circuit system 120 adjusts the phase of the outputs 124(1)-124(2) relative to the outputs 124(3)-124(4) to be approximately -180 degrees to -90 degrees, the movable member is moved in the opposite direction (ie, the other direction opposite to the other direction).

[0082] Figures 4D to 4F FIG2 shows a schematic diagram of the piezoelectric actuator 100 according to an embodiment of the present application moving in a first mode. Figures 4D to 4F As shown, the bending mode is generated by applying circuit vibration signals from outputs 124(1)-124(2) of different stages to the first piezoelectric region 1111 and the third piezoelectric region 1113 having opposite polarities. When the piezoelectricity of all electrodes is 0, Figure 4D FIG2 shows the piezoelectric plate structure 111 at rest. When the voltage difference between the outputs 124(1) and 124(2) is positive, the length of the first piezoelectric region 1111 increases, while the length of the third piezoelectric region 1113 decreases, so that the piezoelectric plate structure 111 is in a state of being stationary. Figure 4E When the voltage difference between the outputs 124 (1) and 124 (2) is negative, the length of the first piezoelectric region 1111 decreases, while the length of the third piezoelectric region 1113 increases, so that the piezoelectric plate structure is as shown. Figure 4F Bend shown.

[0083] Figures 4G to 4I FIG2 shows a schematic diagram of the piezoelectric actuator 100 moving in the second mode according to an embodiment of the present application.

[0084] like Figures 4G to 4I As shown, the bending mode is generated by applying the vibration signals from the outputs 124(3)-124(4) of different stages to the second piezoelectric region 1112 and the fourth piezoelectric region 1114 having opposite polarities. When the piezoelectricity of all electrodes is 0, Figure 4GFIG. 1 shows the situation when the piezoelectric plate structure 111 is at rest. When the voltage difference between the outputs 124 (3) and 124 (4) is positive, the length of the second piezoelectric region 1112 decreases, while the length of the fourth piezoelectric region 1114 increases, so that the piezoelectric plate structure 111 is as shown in FIG. Figure 4H When the voltage difference between the outputs 124 (3) and 124 (4) is negative, the length of the second piezoelectric region 1112 increases, while the length of the fourth piezoelectric region 1114 decreases, so that the piezoelectric plate structure is as shown. Figure 4I Bend shown.

[0085] Accordingly, when Figure 3 When the output circuit vibration signal shown in the figure is applied to the actuating system 110, the actuating system 110 forms a two-dimensional trajectory in the shape of an elliptical orbit, that is, the driving circuit system 120 can control the direction of rotation of the actuating system 110 on the elliptical orbit path according to the phase difference value, so that the actuating system 110 can drive the object at a relatively smaller and more precise step speed.

[0086] Figure 4J FIG2 shows another schematic diagram of the piezoelectric plate structure 111 of the piezoelectric actuator 100 according to an embodiment of the present application. Figure 4J As shown, in the embodiment of the present application, the actuation system 110 further includes a friction driving portion 112 fixed to the piezoelectric plate structure 111, wherein the friction driving portion 112 is adapted to be frictionally coupled to the object to be acted upon so as to drive the object to move along a predetermined direction by friction. In order to enable the friction driving portion 112 to be frictionally coupled to the object to be acted upon, as shown in FIG. Figure 4K As shown, during the installation process, the piezoelectric actuator 100 is usually provided with a pre-compression component 43 / 46, which provides a pre-compression force between the piezoelectric actuator 100 and the object to be acted on, so that the friction driving portion 112 of the piezoelectric actuator 100 can be frictionally coupled to the object to drive the object to move along a predetermined direction by friction, as shown in FIG. Figure 4L shown.

[0087] Specifically, in this embodiment, the friction drive unit 112 includes at least one contact pad, which can be fixed to the piezoelectric plate structure 111 along the depth direction or along the height direction. In this embodiment, the at least one contact pad can have a hemispherical shape, but other shapes are also possible, such as a semi-cylindrical shape, a table shape, a rectangle, etc. Preferably, the at least one contact pad is made of a material with excellent friction and durability, such as a metal oxide material (e.g., zirconium oxide, aluminum oxide, etc.).

[0088] It's worth noting that compared to traditional electromagnetic actuators, the piezoelectric actuator 100 offers advantages such as small size, high thrust, and high precision. Quantitatively, the piezoelectric actuator 100 according to the present embodiment can provide a driving force of 0.6N to 2N, sufficient to drive components weighing more than 100mg.

[0089] In addition to being able to provide relatively large driving force, the piezoelectric actuator 100 also has other advantages compared to traditional electromagnetic motor solutions and memory alloy motor solutions, including but not limited to: relatively small size (having a slender shape), better response accuracy, relatively simpler structure, relatively simpler drive control, high product consistency, no electromagnetic interference, relatively larger stroke, short stabilization time, relatively small weight, etc.

[0090] Specifically, the camera module requires that the driver it is equipped with has characteristics such as a long driving stroke and good alignment accuracy. In the existing voice coil motor solution, in order to ensure the linearity of movement, it is necessary to design additional guide rods or ball guides, and at the same time, it is necessary to adapt large-sized driving magnets / coils on the side of the lens, and at the same time, it is necessary to set auxiliary positioning devices such as balls, springs, and suspension wires. In order to accommodate more components, ensure structural strength and reserve structural gaps, the module's lateral dimensions are often large, the structural design is complex, and the module weight is heavy. The memory alloy motor solution is limited by the relatively small stroke that can be provided by the memory alloy solution of the same proportion, and there are potential reliability risks such as breakage.

[0091] The piezoelectric actuator 100 has a relatively simple structure and an even simpler assembly structure. In addition, the size of its components is basically unrelated to the motion stroke of the piezoelectric actuator 100. Therefore, the piezoelectric actuator 100 can achieve advantages such as high thrust, small size, and light weight. At the same time, it is designed to match a larger stroke or heavier device weight, and the integration level in the design is also higher.

[0092] Furthermore, the piezoelectric actuator 100 pushes the object to be pushed to perform micron-level movement by means of frictional contact. Compared with the electromagnetic solution, the non-contact method of driving the object to be pushed requires relying on electromagnetic force to offset gravity. The friction method has the advantages of greater thrust, greater displacement and lower power consumption, while having higher control accuracy. Moreover, when there are multiple motor mechanisms, the piezoelectric actuator 100 does not have a magnet coil structure and there is no magnetic interference problem. In addition, the piezoelectric actuator 100 can rely on the friction between the components to self-lock, thereby reducing the shaking and abnormal noise of the camera module when performing optical image stabilization.

[0093] After the piezoelectric actuator 100 is selected as a driver to drive the photosensitive component 10 for optical image stabilization, specifically, as follows Figure 1and Figure 3 As shown, in this embodiment, the drive assembly 40 includes: a first supporting frame 41, a first drive element 42, a first pre-stressing component 43, a second supporting frame 44, a second drive element 45, a second pre-stressing component 46 and an outer frame 47, wherein the first drive element 42 and the second drive element 45 are implemented as the piezoelectric actuator 100 as described above.

[0094] Accordingly, if Figure 1 and Figure 3 As shown, in this embodiment, the photosensitive assembly 10 is mounted on the first supporting frame 41. The first driving element 42 is frictionally coupled to the first supporting frame 41 via the first pre-stressing component 43. The first driving element 42 is configured to, when driven, move in a first direction in a plane perpendicular to the optical axis in a two-dimensional trajectory in a manner of bending vibration along two directions. This frictionally drives the first supporting frame 41 to drive the photosensitive assembly 10 to move in the first direction in a plane perpendicular to the optical axis for optical image stabilization. The second supporting frame 44 is externally mounted on the first supporting frame 41. The second driving element 45 is frictionally coupled to the second supporting frame 44 via the second pre-stressing component 46. The first driving element 45 is configured to, when driven, move in a second direction in a plane perpendicular to the optical axis in a two-dimensional trajectory in a manner of bending vibration along two directions. This frictionally drives the second supporting frame 44 to drive the first supporting frame 41 to move the photosensitive assembly 10 in a plane perpendicular to the optical axis for optical image stabilization in a second direction. The first direction is perpendicular to the second direction. In one example, the first direction is the X-axis direction, and the second direction is the Y-axis direction.

[0095] Here, the first driving element 42 is frictionally coupled to the first supporting frame 41, including: direct frictional action between the first driving element 42 and the first supporting frame 41, and indirect frictional action between the first driving element 42 and the first supporting frame 41 (that is, although there is no direct frictional force between the first driving element 42 and the first supporting frame 41, the frictional driving force generated by the first driving element 42 can act on the first supporting frame 41). Correspondingly, the second driving element 45 is frictionally coupled between the second supporting frame 44 and the outer frame 47, including: direct frictional action between the second driving element 45 and the second supporting frame 44, and indirect frictional action between the second driving element 45 and the second supporting frame 44 (that is, although there is no direct frictional force between the second driving element 45 and the second supporting frame 44, the frictional driving force generated by the second driving element 45 can act on the second supporting frame 44).

[0096] More specifically, in this embodiment, Figure 3 As shown, the first driving element 42 is clamped between the first supporting frame 41 and the second supporting frame 44 through the first pre-pressing component 43, so that the first driving element 42 is frictionally coupled to the first supporting frame 41.

[0097] Accordingly, in this embodiment, the first pre-stressing component 43 includes a first elastic element 431, which is arranged between the piezoelectric plate structure 111 of the first driving element 42 and the second supporting frame 44, so as to force the first driving element 42 to be frictionally coupled to the first supporting frame 41 through the elastic force of the first elastic element 431. In one example of the present application, the friction driving portion 112 of the first driving element 42 directly contacts the surface of the outer wall of the first supporting frame 41. Accordingly, the elastic force provided by the first elastic element 431 can force the friction driving portion 112 of the first driving element 42 to contact the surface of the outer wall of the first supporting frame 41, so as to form a friction contact bonding relationship between the two. In this way, after the first driving element 42 is turned on, the friction driving portion 112 of the first driving element 42 can drive the first supporting frame 41 to move along the first direction in a friction-driven manner, so as to drive the photosensitive component 10 to move along the first direction to perform optical image stabilization in the first direction.

[0098] In a specific example of the present application, the first elastic element 431 is implemented as an elastic adhesive, that is, the first elastic element 431 is implemented as glue that becomes elastic after curing. Accordingly, during the installation process, a layer of adhesive with a thickness of 10 to 50 μm can be applied between the surface of the inner sidewall of the second supporting frame 44 and the piezoelectric plate structure 111 of the first driving element 42. After the adhesive is cured, the first elastic element 431 is formed between the piezoelectric plate structure 111 of the first driving element 42 and the second supporting frame 44. It should be understood that in this example, the first elastic element 431 not only provides preload, but also enables the first driving element 42 to be fixed to the surface of the inner sidewall of the second supporting frame 44. Preferably, the first elastic element 431 has a relatively high flatness, that is, when applying the adhesive, the applied adhesive is ensured to have a relatively high flatness and uniformity as much as possible, so that the first driving element 42 can be fixed flatly on the surface of the inner wall of the second supporting frame 44, thereby improving the driving stability of the first driving element 42.

[0099] Accordingly, in this embodiment, Figure 3As shown, the second driving element 45 is clamped between the second supporting frame 44 and the outer frame 47 by the second pre-pressing component 46. In this way, the second driving element 45 is frictionally coupled to the second supporting frame 44. Figure 1 As shown, the lens carrier 21 of the lens assembly 20 is carried on the outer frame 47 .

[0100] Further, if Figure 3 As shown, in this embodiment, the second pre-stressing component 46 includes a second elastic element 461, which is arranged between the piezoelectric plate structure 111 of the second driving element 45 and the outer frame 47, so that the elastic force of the second elastic element 461 forces the second driving element 45 to be frictionally coupled to the second supporting frame 44. Accordingly, in a specific example of the present application, the friction driving portion 112 of the second driving element 45 directly contacts the surface of the outer wall of the second supporting frame 44. Accordingly, the elastic force provided by the second elastic element 461 can force the friction driving portion 112 of the second driving element 45 to contact the surface of the outer wall of the second supporting frame 44, so as to form a frictional contact relationship between the two. In this way, after the second driving element 45 is turned on, the friction driving portion 112 of the second driving element 45 can drive the second supporting frame 44 to move along the second direction in a friction-driven manner, thereby driving the photosensitive component 10 to move along the second direction to perform optical image stabilization in the second direction.

[0101] In a specific example of the present application, the second elastic element 461 is implemented as an elastic adhesive, that is, the second elastic element 461 is implemented as glue that has elasticity after curing. Accordingly, during the installation process, a layer of adhesive with a thickness of 10 to 50 μm can be applied between the surface of the inner sidewall of the outer frame 47 and the piezoelectric plate structure 111 of the second driving element 45. After the adhesive is cured, the second elastic element 461 is formed between the piezoelectric plate structure 111 of the second driving element 45 and the outer frame 47. It should be understood that in this example, the second elastic element 461 not only provides preload, but also enables the second driving element 45 to be fixed to the surface of the inner sidewall of the outer frame 47. Preferably, the second elastic element 461 has a relatively high flatness, that is, when applying the adhesive, the applied adhesive is ensured to have a relatively high flatness and uniformity as much as possible, so that the second driving element 45 can be fixed flatly on the surface of the inner wall of the outer frame 47, thereby improving the driving stability of the second driving element 45.

[0102] It is worth mentioning that in other embodiments of the present application, the first elastic element 431 and the second elastic element 461 can also be implemented as non-viscous elastic elements, for example, rubber whose material itself has elasticity, or springs and leaf springs that generate elasticity due to deformation, etc., which are also not limited to the present application.

[0103] It is worth mentioning that in other modified embodiments of the present application, the structural configurations of the first pre-pressing component 43 and the second pre-pressing component 46 can also be adjusted. Figure 5 In the illustrated variant embodiment, the first pre-pressing component 43 includes a first magnetic element 52 disposed on the first supporting frame 41 and a second magnetic element 53 disposed on the second supporting frame 44 and corresponding to the first magnetic element 52. The first driving element 42 is frictionally coupled to the first supporting frame 41 through the magnetic attraction between the first magnetic element 52 and the second magnetic element 53. The second pre-pressing component 46 includes a third magnetic element 62 disposed on the second supporting frame 44 and a fourth magnetic element 63 disposed on the lens carrier 21 and corresponding to the third magnetic element 62. The second driving element 45 is frictionally coupled to the second supporting frame 44 through the magnetic attraction between the third magnetic element 62 and the fourth magnetic element 63.

[0104] In this variant embodiment, the first magnetic element 52 and the second magnetic element 53 refer to magnetic components that can attract each other. For example, the first magnetic element 52 can be implemented as a magnet, and the second magnetic element 53 can be implemented as a magnetic component, for example, a material made of a metal such as iron, nickel, or cobalt. For another example, the first magnetic element 52 can be implemented as a magnet, and the second magnetic element 53 can also be implemented as a magnet. In this variant embodiment, the third magnetic element 62 and the fourth magnetic element 63 refer to magnetic components that can attract each other. For example, the third magnetic element 62 can be implemented as a magnet, and the fourth magnetic element 63 can be implemented as a magnetic component, for example, a material made of a metal such as iron, nickel, or cobalt. For another example, the third magnetic element 62 can be implemented as a magnet, and the fourth magnetic element 63 can also be implemented as a magnet.

[0105] In order to enable the first driving element 42 and the second driving element 45 to drive the first supporting frame 41 and the second supporting frame 44 more stably, Figure 3As shown, the driving assembly 40 further includes a first guide mechanism 48 arranged between the first supporting frame 41 and the second supporting frame 44, and a second guide mechanism 49 arranged between the second supporting frame 44 and the outer frame 47, wherein the first guide mechanism 48 is configured to guide the first supporting frame 41 to move along the first direction, and the second guide mechanism 49 is configured to guide the second supporting frame 44 to move along the second direction.

[0106] More specifically, if Figure 3 As shown, in this embodiment, the first guide mechanism 48 and the second guide mechanism 49 are implemented as guide rod structures. Accordingly, the first guide mechanism 48 includes a first guide rod disposed on the outer wall of the first supporting frame 41 and extending along the first direction, wherein both ends of the first guide rod are fixed to the inner wall of the second supporting frame 44. Specifically, in this embodiment, the first guide rod is disposed opposite the first driving element 42 in the same direction. Thus, when the first driving element 42 is turned on, the first supporting frame 41 is guided to move along the direction in which the first guide rod extends, thereby improving the movement stability of the first supporting frame 41.

[0107] Accordingly, in this embodiment, the second guiding mechanism 49 includes a second guide rod disposed on the outer sidewall of the second supporting frame 44 and extending along the second direction, wherein both ends of the second guide rod are fixed to the inner sidewall of the outer frame 47. In particular, in this embodiment, the second guide rod is disposed opposite to the second driving element 45 in the same direction. Thus, when the second driving element 45 is turned on, the second supporting frame 44 is guided to move along the direction in which the second guide rod extends, thereby improving the movement stability of the second supporting frame 44.

[0108] It is worth mentioning that in other embodiments of the present application, the first guiding mechanism 48 and the second guiding mechanism 49 can also be implemented based on other principles, for example, through a ball-groove mechanism, a slider-groove mechanism, etc., which is not limited to the present application.

[0109] In order to optimize the driving performance of the first driving element 42 and the second driving element 45, in the embodiment of the present application, Figures 1 to 3As shown, the driving component 40 further includes a first friction actuating part 131 and a second friction actuating part 132, wherein the first friction actuating part 131 is arranged between the first driving element 42 and the first supporting frame 41 and the friction driving part 112 of the first driving element 42 abuts against the first friction actuating part 131 under the action of the first pre-pressing component 43, and the first friction actuating part 131 abuts against the surface of the outer wall of the first supporting frame 41. In this way, the friction driving force provided by the first driving element 42 can act on the first supporting frame 41 through the first friction actuating part 131 to drive the first supporting frame 41 and the photosensitive component 10 to move along the first direction. That is, in this modified embodiment, the pre-pressure between the friction driving part 112 of the first driving element 42 and the first supporting frame 41 is an indirect pre-pressure, that is, although there is no direct contact between the friction driving part 112 of the first driving element 42 and the first supporting frame 41, there is still pre-pressure between the two so that the friction driving part 112 of the first driving element 42 can drive the first supporting frame 41 by friction driving.

[0110] Correspondingly, the second friction actuating portion 132 is arranged between the second driving element 45 and the second carrying frame 44 and the friction driving portion 112 of the second driving element 45 contacts the second friction actuating portion 132 under the action of the second pre-pressing component 46 and the second friction actuating portion 132 contacts the surface of the outer wall of the second carrying frame 44. In this way, the friction driving force provided by the second driving element 45 can act on the second carrying frame 44 through the second friction actuating portion 132 to drive the second carrying frame 44, the first carrying frame 41 and the photosensitive component 10 to move along the second direction to perform optical image stabilization in the second direction.

[0111] More specifically, if Figure 5As shown, in this embodiment, the first friction actuating part 131 has a first surface and a second surface opposite to the first surface, wherein, under the action of the first pre-pressing component 43, the first surface of the first friction actuating part 131 abuts against the surface of the outer wall of the first supporting frame 41, and the second surface abuts against the end face of the second end of at least one of the multiple friction driving parts 112. In this way, the friction driving part 112 of the first driving element 42 abuts against the first friction actuating part 131 and the first friction actuating part 131 abuts against the first supporting frame 41. In this way, the friction driving force provided by the first driving element 42 can act on the first supporting frame 41 through the first friction actuating part 131. Correspondingly, the second friction actuating part 132 has a third surface and a fourth surface opposite to the third surface, wherein, under the action of the second pre-pressing component 46, the third surface of the second friction actuating part 132 abuts against the surface of the outer wall of the second supporting frame 44, and the fourth surface abuts against the end face of the second end of at least one of the multiple friction driving parts 112. In this way, the friction driving part 112 of the second driving element 45 abuts against the second friction actuating part 132 and the second friction actuating part 132 abuts against the second supporting frame 44. In this way, the friction driving force provided by the second driving element 45 can act on the second supporting frame 44 through the second friction actuating part 132.

[0112] It is worth mentioning that although Figure 1In the illustrated example, the first friction actuating portion 131 and the second friction actuating portion 132 are provided as separate components between the first driving element 42 and the first supporting frame 41, and between the second driving element 45 and the second supporting frame 44, respectively. For example, the first friction actuating portion 131 is implemented as a separate component and attached to the side surface of the first supporting frame 41, or the second friction actuating portion 132 is implemented as a separate component and attached to the side surface of the second supporting frame 44. For another example, the first friction actuating portion 131 is implemented as a coating applied to the side surface of the first supporting frame 41, or the second friction actuating portion 132 is implemented as a coating applied to the side surface of the second supporting frame 44. It should be understood that in other examples of the present application, the first friction actuating portion 131 may also be integrally formed on the surface of the outer side wall of the first supporting frame 41, that is, the first friction actuating portion 131 and the first supporting frame 41 have an integral structure. Of course, in other examples of the present application, the second friction actuating portion 132 may also be integrally formed on the surface of the outer side wall of the second supporting frame 44 , that is, the second friction actuating portion 132 and the second supporting frame 44 have an integrated structure.

[0113] Figure 6 FIG2 is a schematic diagram showing another variant implementation of the camera module according to an embodiment of the present application. Figure 1 As shown in the example, in this modified embodiment, the arrangement of the first driving element 42 and the second driving element 45 is adjusted.

[0114] Specifically, in Figure 1 and Figure 3 In the illustrated example, the first driving element 42 is located on the side of the first supporting frame 41, and the second driving element 45 is located on the side of the second supporting frame 44. Figure 6 As shown, in this modified embodiment, the first driving element 42 is located on the upper part of the first supporting frame 41 , and the second driving element 45 is located on the upper part of the second supporting frame 44 .

[0115] In a specific example of this modified embodiment, the first driving element 42 is clamped and disposed above and below the first supporting frame 41 and the second supporting frame 44 via the first pre-pressing component 43. In this manner, the first driving element 42 is frictionally coupled to the first supporting frame 41. The second driving element 45 is clamped and disposed above and below the second supporting frame 44 and the lens carrier 21 via the second pre-pressing component 46. In this manner, the second driving element 45 is frictionally coupled to the second supporting frame 44.

[0116] In accordance therewith, the driving assembly 40 further comprises a first guide mechanism 48 disposed between the first supporting frame 41 and the second supporting frame 44 and a second guide mechanism 49 disposed between the second supporting frame 44 and the outer frame 47. Figure 1 and Figure 3 The difference from the illustrated example is that in this modified embodiment, the first guide mechanism 48 and the second guide mechanism 49 are implemented as ball-groove mechanisms, such as Figure 7 shown.

[0117] Figure 8 FIG2 is a schematic diagram showing another variant implementation of the camera module according to an embodiment of the present application. Figure 1 As shown in the example, in this modified embodiment, the arrangement of the first driving element 42 and the second driving element 45 is adjusted again.

[0118] Specifically, if Figure 8 As shown, in this modified embodiment, the first driving element 42 is located at the lower part of the first supporting frame 41 , and the second driving element 45 is located at the lower part of the second supporting frame 44 .

[0119] In a specific example of this modified embodiment, the first driving element 42 is clamped and disposed between the first supporting frame 41 and the second supporting frame 44 via the first pre-pressing component 43. In this manner, the first driving element 42 is frictionally coupled to the first supporting frame 41. The second driving element 45 is clamped and disposed between the second supporting frame 44 and the outer frame 47 via the second pre-pressing component 46. In this manner, the second driving element 45 is frictionally coupled to the second supporting frame 44.

[0120] In accordance therewith, the driving assembly 40 further comprises a first guide mechanism 48 disposed between the first supporting frame 41 and the second supporting frame 44 and a second guide mechanism 49 disposed between the second supporting frame 44 and the outer frame 47. Figure 1 and Figure 3 The difference from the illustrated example is that in this modified embodiment, the first guide mechanism 48 and the second guide mechanism 49 are implemented as ball-groove mechanisms, such as Figure 8 shown.

[0121] In summary, the camera module based on the embodiment of the present application is explained, wherein the camera module adopts the piezoelectric actuator 100 as a driver to not only meet the driving requirements of the camera module for optical performance adjustment, but also meet the development needs of lightweight and thin camera modules.

[0122] Although, in the embodiment of the present application, the camera module is taken as an example of a traditional upright camera module, a person skilled in the art should understand that the piezoelectric actuator 100 according to the embodiment of the present application can also be used as a driver in a periscope camera module, and this is not limited to the present application.

[0123] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A camera module, characterized in that: include: The photosensitive component comprises: a circuit board and a photosensitive chip electrically connected to the circuit board; A lens assembly held on the light-sensing path of the light-sensing component comprises: a lens carrier and an optical lens mounted on the lens carrier, wherein the optical lens has an optical axis; and A drive assembly comprising: a first carrier frame, a second carrier frame, a first drive element, and a first pre-pressing component, wherein the photosensitive component is mounted on the first carrier frame, the second carrier frame is externally disposed on the first carrier frame, and the first drive element is implemented as a piezoelectric actuator, wherein the first drive element is frictionally coupled to the first carrier frame via the first pre-pressing component and is configured to, after being driven, move in a two-dimensional trajectory in a plane perpendicular to the optical axis in a manner of bending vibration along two directions, thereby driving the first carrier frame through friction to drive the photosensitive component to move in a first direction in a plane perpendicular to the optical axis to perform optical image stabilization; The first pre-stressing component includes a first magnetic element arranged on the first supporting frame and a second magnetic element arranged on the second supporting frame and corresponding to the first magnetic element, so as to force the first driving element to be frictionally coupled to the first supporting frame through the magnetic attraction between the first magnetic element and the second magnetic element.

2. The camera module according to claim 1, wherein: The driving assembly further includes a second driving element and a second pre-stressing component, wherein the second driving element is implemented as a piezoelectric actuator, wherein the second driving element is frictionally coupled to the second supporting frame through the second pre-stressing component and is configured to move in a two-dimensional trajectory in a plane perpendicular to the optical axis in a manner of bending vibration along two directions after being driven, thereby driving the second supporting frame through friction to drive the first supporting frame to drive the photosensitive component to move in a second direction in a plane perpendicular to the optical axis for optical image stabilization, and the first direction is perpendicular to the second direction.

3. The camera module according to claim 2, wherein: The piezoelectric actuator includes an actuating system and a driving circuit system, wherein the actuating system moves along a preset direction in a two-dimensional trajectory in a manner of bending vibration in two directions under the control of the driving circuit system.

4. The camera module according to claim 3, wherein: The actuation system includes a piezoelectric plate structure and a friction driving portion fixed to the piezoelectric plate structure, wherein the friction driving portion is frictionally coupled to the first supporting frame or the second supporting frame.

5. The camera module according to claim 4, wherein: The piezoelectric plate structure has a first side surface extending along its depth direction and a second side surface extending along its height direction and adjacent to the first side surface, wherein the piezoelectric plate structure has a first resonant frequency along its depth direction and a second resonant frequency along its height direction, wherein the second resonant frequency is greater than the first resonant frequency.

6. The camera module according to claim 5, wherein: The piezoelectric plate structure includes a first piezoelectric region, a second piezoelectric region and a third piezoelectric region formed on the second side surface, and a fourth piezoelectric region formed on the first side surface, wherein the second piezoelectric region is located between the first piezoelectric region and the third piezoelectric region, and the fourth piezoelectric region is adjacent to the second piezoelectric region; wherein the piezoelectric plate structure further includes a first electrode pair electrically connected to the first piezoelectric region, a second electrode pair electrically connected to the second piezoelectric region, a third electrode pair electrically connected to the third piezoelectric region and a fourth electrode pair electrically connected to the fourth piezoelectric region.

7. The camera module according to claim 6, wherein: The driving circuit system includes a first driving circuit and a second driving circuit, the first driving circuit is electrically connected to the first electrode pair and the third electrode pair, and the second driving circuit is electrically connected to the second electrode pair and the fourth electrode pair; wherein the vibration frequency of the circuit vibration signal output by the first driving circuit and the second driving circuit is equal to the first resonant frequency or the second resonant frequency.

8. The camera module according to claim 7, wherein: When the vibration frequency of the circuit vibration signal output by the first driving circuit is the first resonant frequency, the piezoelectric plate structure resonates in its height direction and partially resonates in its depth direction, so that the piezoelectric plate structure moves in a two-dimensional trajectory along the preset direction in a manner of bending vibration along two directions; wherein, when the vibration frequency of the circuit vibration signal input by the second driving circuit is the second resonant frequency, the piezoelectric plate structure resonates in its depth direction and partially resonates in its height direction, so that the piezoelectric plate structure moves in a two-dimensional trajectory along the preset direction in a manner of bending vibration along two directions.

9. The camera module according to claim 8, wherein: The drive assembly further includes a first friction actuating portion and a second friction actuating portion, wherein the first friction actuating portion is clamped between the first drive element and the first supporting frame so that the first drive element is frictionally coupled to the first supporting frame through the first friction actuating portion and the first pre-pressing component; the second friction actuating portion is clamped between the second drive element and the second supporting frame so that the second drive element is frictionally coupled to the second supporting frame through the second pre-pressing component and the second friction actuating portion.

10. The camera module according to claim 9, wherein: The first driving element is located on a side of the first carrying frame.

11. The camera module according to claim 9, wherein: The first driving element is located on the upper portion of the first supporting frame.

12. The camera module according to claim 9, wherein: The first driving element is located at the lower part of the first supporting frame.

13. The camera module according to claim 10, wherein: The drive assembly further includes an outer frame external to the second supporting frame, wherein the second drive element is clamped between the second supporting frame and the outer frame through the second pre-pressing component and the second friction actuating portion, in this way, the second drive element is frictionally coupled to the second supporting frame, wherein the second drive element is located on the side of the second supporting frame.

14. The camera module according to claim 11, wherein: The second driving element is clamped between the second supporting frame and the lens carrier by the second pre-pressing component and the second friction actuating portion, so that the second driving element is frictionally coupled to the second supporting frame, wherein the second driving element is located at the upper part of the second supporting frame.

15. The camera module according to claim 12, wherein: The drive assembly further includes an outer frame external to the second supporting frame, wherein the second drive element is clamped between the second supporting frame and the outer frame through the second pre-pressing component and the second friction actuating portion. In this way, the second drive element is frictionally coupled to the second supporting frame, wherein the second drive element is located at the lower part of the second supporting frame.

16. The camera module according to claim 13, wherein: The driving assembly further includes a first guide mechanism disposed between the first carrying frame and the second carrying frame, and a second guide mechanism disposed between the second carrying frame and the outer frame.

17. The camera module according to claim 14, wherein: The driving assembly further includes a first guiding mechanism disposed between the first carrying frame and the second carrying frame, and a second guiding mechanism disposed between the second carrying frame and the lens carrier.

18. The camera module according to claim 15, wherein: The driving assembly further includes a first guide mechanism disposed between the first carrying frame and the second carrying frame, and a second guide mechanism disposed between the second carrying frame and the outer frame.

19. The camera module according to claim 13, wherein: The first pre-stressing component forces the friction driving part of the first driving element to press against the first friction actuating part through the magnetic attraction between the first magnetic element and the second magnetic element, in such a way that the first driving element is frictionally coupled to the first supporting frame; the second pre-stressing component includes a third magnetic element arranged on the second supporting frame and a fourth magnetic element arranged on the outer frame and corresponding to the third magnetic element, so as to force the friction driving part of the second driving element to press against the second friction actuating part through the magnetic attraction between the third magnetic element and the fourth magnetic element, in such a way that the second driving element is frictionally coupled to the second supporting frame.

20. The camera module according to claim 14, wherein: The first pre-stressing component forces the friction driving part of the first driving element to press against the first friction actuating part through the magnetic attraction between the first magnetic element and the second magnetic element, in such a way that the first driving element is frictionally coupled to the first supporting frame; the second pre-stressing component includes a third magnetic element arranged on the second supporting frame and a fourth magnetic element arranged on the lens carrier and corresponding to the third magnetic element, so as to force the friction driving part of the second driving element to press against the second friction actuating part through the magnetic attraction between the third magnetic element and the fourth magnetic element, in such a way that the second driving element is frictionally coupled to the second supporting frame.

21. The camera module according to claim 15, wherein: The first pre-stressing component forces the friction driving part of the first driving element to press against the first friction actuating part through the magnetic attraction between the first magnetic element and the second magnetic element, in such a way that the first driving element is frictionally coupled to the first supporting frame; the second pre-stressing component includes a third magnetic element arranged on the second supporting frame and a fourth magnetic element arranged on the outer frame and corresponding to the third magnetic element, so as to force the friction driving part of the second driving element to press against the second friction actuating part through the magnetic attraction between the third magnetic element and the fourth magnetic element, in such a way that the second driving element is frictionally coupled to the second supporting frame.

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