Camera module

Abstract

Disclosed is a camera module, 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, and the first driving element is implemented as a piezoelectric actuator, wherein the first driving element is pressed against the first supporting frame in a frictional contact manner through the first pre-stressing component, and is configured to drive the first supporting frame to move the photosensitive component in a plane perpendicular to the optical axis for optical image stabilization. In this way, a new type of piezoelectric actuator is adopted as a driving element to meet the driving requirements of the camera module, and is arranged in the camera module in a reasonable layout scheme to meet the structural design requirements and size design requirements of the camera module at the same time.

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 lens 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] The 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 pressed against the first carrying frame in a frictional contact manner through the first pre-stressing component, and is configured to drive the first carrying frame to move the photosensitive component 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 pressed against the second supporting frame in a frictional contact manner through the second pre-stressing component, and is configured to drive the second supporting frame to drive the first supporting frame to drive the photosensitive component to move in a plane perpendicular to the optical axis for optical image stabilization.

[0016] In the camera module according to the present application, the piezoelectric actuator includes: a piezoelectric active part and a friction driving part that is traversably connected to the piezoelectric active part, wherein after the piezoelectric actuator is turned on, the friction driving part is configured to provide a driving force for driving the first supporting frame or the second supporting frame under the action of the piezoelectric active part.

[0017] In the camera module according to the present application, the piezoelectric active part has multiple groups of first polarization regions and second polarization regions that are alternately arranged, and the first polarization regions and the second polarization regions have opposite polarization directions. After the piezoelectric actuator is turned on, the multiple groups of first polarization regions and second polarization regions that are alternately arranged undergo deformation in different directions to drive the friction driving part to move along a preset direction in a traveling wave or standing wave manner to provide a driving force for driving the first supporting frame or the second supporting frame.

[0018] In the camera module according to the present application, the friction driving portion includes a plurality of friction driving elements spaced apart from each other, and a first end of each of the friction driving elements is coupled to the piezoelectric active portion.

[0019] In the camera module according to the present application, the piezoelectric actuator further includes: a friction connection layer stacked on the piezoelectric active part, and each of the friction drive elements is coupled to the piezoelectric active part in such a way that its first end is fixed to the friction connection layer.

[0020] In the camera module according to the present application, the multiple end faces of the second ends of the multiple friction drive elements opposite to the first ends are in the same plane.

[0021] In the camera module according to the present application, the driving component further includes a first friction actuating part and a second friction actuating part, the first friction actuating part is arranged between the first driving element and the first supporting frame, and the second friction actuating part is arranged between the second driving element and the second supporting frame.

[0022] In the camera module according to the present application, the first friction actuating part has a first surface and a second surface opposite to the first surface, the first surface is in contact with the surface of the first supporting frame, and the second surface is in contact with the end face of the second end of at least one of the multiple friction driving elements; the second friction actuating part has a third surface and a fourth surface opposite to the third surface, the third surface is in contact with the surface of the second supporting frame, and the fourth surface is in contact with the end face of the second end of at least one of the multiple friction driving elements.

[0023] In the camera module according to the present application, the first supporting frame has a first groove formed concavely on its surface, and the first friction actuating part is arranged in the first groove; and / or, the second supporting frame has a second groove formed concavely on its surface, and the second friction actuating part is arranged in the second groove.

[0024] In the camera module according to the present application, the lengths of the first groove and the second groove are greater than the length dimension of the piezoelectric actuator, and the width dimension of the piezoelectric actuator is less than or equal to the width dimension of the first groove and the second groove.

[0025] In the camera module according to the present application, the length dimension of the piezoelectric actuator is less than or equal to 20 mm, the width dimension is less than or equal to 1 mm, and the height dimension is less than or equal to 1 mm.

[0026] In the camera module according to the present application, the first driving element is clamped between the first supporting frame and the second supporting frame through the first pre-pressing component and the first friction actuating part. In this way, the first driving element is pressed against the first supporting frame in friction contact.

[0027] In the camera module according to the present application, the first driving element is located on the side of the first supporting frame.

[0028] In the camera module according to the present application, the first driving element is located on the upper part of the first supporting frame.

[0029] In the camera module according to the present application, the first driving element is located at the lower part of the first supporting frame.

[0030] In the camera module according to the present application, the driving assembly further includes an outer frame external to 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 pressed against the second supporting frame in frictional contact, wherein the second driving element is located on the side of the second supporting frame.

[0031] In the camera module according to the present application, 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 pressed against the second supporting frame in frictional contact, wherein the second driving element is located at the upper part of the second supporting frame.

[0032] 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 pressed against the second supporting frame in frictional contact, wherein the second driving element is located at the lower part of the second supporting frame.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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 active part of the first driving element and the second supporting frame, so that the first driving element is forced to press against the first supporting frame in a frictional contact manner through the elastic force of the first elastic element; the second pre-stressing element includes a second elastic element, which is arranged between the piezoelectric active part of the second driving element and the outer frame, so that the second driving element is forced to press against the second supporting frame in a frictional contact manner through the elastic force of the second elastic element.

[0037] 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 active part of the first driving element and the second supporting frame, so that the first driving element is forced to press against the first supporting frame in a frictional contact manner through the elastic force of the first elastic element; the second pre-stressing element includes a second elastic element, which is arranged between the piezoelectric active part of the second driving element and the lens carrier, so that the second driving element is forced to press against the second supporting frame in a frictional contact manner through the elastic force of the second elastic element.

[0038] 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 active part of the first driving element and the second supporting frame, so that the first driving element is forced to press against the first supporting frame in a frictional contact manner through the elastic force of the first elastic element; the second pre-stressing element includes a second elastic element, which is arranged between the piezoelectric active part of the second driving element and the outer frame, so that the second driving element is forced to press against the second supporting frame in a frictional contact manner through the elastic force of the second elastic element.

[0039] In the camera module according to the present application, the first elastic element and the second elastic element are implemented as elastic adhesives.

[0040] 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.

[0041] 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 as to force the first driving element to press against the first supporting frame in a frictional contact manner through the magnetic attraction between the first magnetic element and the second magnetic element; 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 second driving element to press against the second supporting frame in a frictional contact manner through the magnetic attraction between the third magnetic element and the fourth magnetic element.

[0042] 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 as to force the first driving element to press against the first supporting frame in a frictional contact manner through the magnetic attraction between the first magnetic element and the second magnetic element; 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 first driving element to press against the first supporting frame in a frictional contact manner through the magnetic attraction between the first magnetic element and the second magnetic element.

[0043] 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 as to force the first driving element to press against the first supporting frame in a frictional contact manner through the magnetic attraction between the first magnetic element and the second magnetic element; 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 second driving element to press against the second supporting frame in a frictional contact manner through the magnetic attraction between the third magnetic element and the fourth magnetic element.

[0044] Further objectives and advantages of the present application will be fully reflected through understanding of the following description and drawings.

[0045] 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

[0046] 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.

[0047] Figure 1 The figure shows a schematic diagram of a camera module according to an embodiment of the present application.

[0048] Figure 2 The figure shows a schematic diagram of the photosensitive component of the camera module according to an embodiment of the present application.

[0049] Figure 3 Another schematic diagram of the camera module according to an embodiment of the present application is shown.

[0050] Figure 4 FIG2 shows a schematic diagram of a piezoelectric actuator according to an embodiment of the application.

[0051] Figure 5 FIG2 shows a schematic diagram of the piezoelectric actuator after being turned on according to an embodiment of the present application.

[0052] Figure 6 FIG2 is a schematic diagram showing a modified implementation of the piezoelectric actuator according to an embodiment of the present application.

[0053] Figure 7The figure shows a schematic diagram of a modified implementation of the camera module according to an embodiment of the present application.

[0054] Figure 8 The figure shows a schematic diagram of another modified implementation of the camera module according to an embodiment of the present application.

[0055] Figure 9 The figure shows a schematic diagram of another modified implementation of the camera module according to the embodiment of the present application.

[0056] Figure 10 The figure shows a schematic diagram of another modified implementation of the camera module according to the embodiment of the present application.

[0057] Figure 11 The figure shows a schematic diagram of another modified implementation of the camera module according to the embodiment of the present application.

[0058] Figure 12 The figure shows a schematic diagram of another modified implementation of the camera module according to the embodiment of the present application.

[0059] Figure 13 The figure shows a partial schematic diagram of another modified implementation of the camera module according to the embodiment of the present application. DETAILED DESCRIPTION

[0060] 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.

[0061] Exemplary camera module

[0062] 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.

[0063] 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 resolution of the optical lens 22 is proportional to the number of optical lenses within a certain range, that is, the higher the resolution, 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 22 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.

[0064] 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 21 and the photosensitive component 10 by the drive carrier to perform autofocus, and this is not limited to the present application.

[0065] 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.

[0066] Furthermore, in Figure 2In 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 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 zoom 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.

[0067] 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.

[0068] 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.).

[0069] 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 lens exceeds 100mg, the existing actuators will not be able to meet the application requirements of the camera module.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] Figure 4 FIG2 shows a schematic diagram of a piezoelectric actuator according to an embodiment of the application. Figure 4 As shown, the piezoelectric actuator 100 according to an embodiment of the present application includes: a piezoelectric active part 110 and a friction driving part 120 that is transmission-connected to the piezoelectric active part 110, wherein after the piezoelectric actuator 100 is turned on, the friction driving part 120 is configured to provide a driving force for driving a driven object under the action of the piezoelectric active part 110.

[0075] Specifically, in this embodiment, the piezoelectric active part 110 is implemented as a piezoelectric ceramic element having a strip-shaped structure. Figure 4 As shown, the piezoelectric active portion 110 is a piezoelectric stacked structure having a plurality of groups of first polarization regions A1 and second polarization regions A2 alternately arranged with each other, wherein the first polarization regions A1 and the second polarization regions A2 have opposite polarization directions, wherein, after the piezoelectric actuator 100 is turned on, the plurality of groups of first polarization regions A1 and second polarization regions A2 alternately arranged with each other undergo deformation in different directions to drive the friction driving portion 120 to move in a traveling wave or standing wave manner along a preset direction to provide a driving force for driving the component, as shown in FIG. Figure 4 shown.

[0076] More specifically, further reference is made to Figure 5 In this embodiment, the piezoelectric active portion 110 has multiple groups of first polarization regions A1 and second polarization regions A2 that are arranged alternately with each other, and the polarization directions of the polarization regions A1 and the polarization regions A2 are opposite. It should be noted that in this embodiment, the multiple groups of alternating polarization regions A1 and the polarization regions A2 are arranged side by side, that is, the multiple groups of alternating polarization regions A1 and the polarization regions A2 are on the same straight line. In addition, the piezoelectric active portion 110 is electrically connected to an external excitation power source via a wire, so that after the piezoelectric active portion 110 is provided with power excitation, the piezoelectric active portion 110 is deformed due to the inverse piezoelectric effect of the piezoelectric active portion 110. It should be understood that the deformation of the piezoelectric active part 110 will drive the friction driving part 120 to move in a traveling wave or standing wave manner, that is, the deformation of the piezoelectric active part 110 can be transmitted to the friction driving part 120 to provide driving force through the traveling wave or standing wave motion of the friction driving part 120.

[0077] It is worth mentioning that in other examples of the present application, each group of the first polarization region A1 and the second polarization region A2 may also have the same polarization direction, wherein, after the piezoelectric actuator 100 is turned on, by inputting an alternating voltage signal to each group of the first polarization region A1 and the second polarization region A2, multiple groups of the first polarization regions A1 and the second polarization regions A2 that are alternately arranged with each other undergo deformation in different directions to drive the friction drive part 120 to move along the preset direction in a standing wave manner, which is not limited to the present application.

[0078] Furthermore, in this embodiment, Figure 4As shown, the friction drive unit 120 includes a plurality of friction drive elements 121 spaced apart from each other, wherein the first end of each friction drive element 121 is coupled to the piezoelectric active unit 110, thereby enabling the friction drive unit 120 to be transmission-connected to the piezoelectric active unit 110. The number of the plurality of friction drive elements 121 can be 2, 3, 4, or more. Preferably, the number of the friction drive elements 121 exceeds 3 (i.e., greater than or equal to 3). This configuration allows the piezoelectric actuator 100 to achieve a stable output of linear driving force while also controlling the length of the piezoelectric actuator 100, making it suitable for installation in relatively small devices such as camera modules. In this embodiment, the length of the piezoelectric actuator 100 is approximately equal to the length of the piezoelectric active unit 110 (which is in the form of an elongated strip). Quantitatively, in this embodiment, the length of the piezoelectric actuator 100 is less than or equal to 20 mm, preferably less than or equal to 10 mm.

[0079] More preferably, in this embodiment, the multiple friction driving elements 121 are located in the middle area of the piezoelectric active part 110, so that when the object is driven by the multiple friction driving elements 121, the movement of the driven object will be smoother and more linear.

[0080] It should be noted that in this embodiment, the friction drive element 121 has a columnar structure that protrudes from the upper surface of the piezoelectric active portion 110. Externally, the piezoelectric actuator 100 has a rack-like shape. It should be understood that in other examples of this application, the friction drive element 121 can also be implemented in other shapes, for example, its cross-section can be set to a trapezoidal shape, and this is not limited to this application.

[0081] It is worth mentioning that when the number of the friction driving elements 121 exceeds 2, that is, greater than or equal to 3, preferably, the at least 3 friction driving elements 121 are arranged equidistantly, which is conducive to improving the driving stability of the piezoelectric actuator 100.

[0082] Furthermore, if Figure 4 As shown, in this embodiment, when the piezoelectric actuator 100 is not turned on, the end surfaces of the second ends of the plurality of friction drive elements 121 opposite to the first ends are in the same plane, for example, Figure 3In the illustrated example, the end surfaces of the second ends of the plurality of friction drive elements 121 are on the same horizontal plane. That is, in this embodiment, the end surfaces of the second ends of the plurality of friction drive elements 121 form a common plane. Accordingly, in some embodiments of the present application, a layer of friction material may be further applied to this plane (i.e., the plane defined by the end surfaces of the second ends of the plurality of friction drive elements 121) to increase friction.

[0083] It's worth noting that, in practical applications, a mover is typically disposed on the upper surface of the friction drive unit 120 to transmit the traveling wave or standing wave driving force provided by the friction drive unit 120 to the driven object. Specifically, a friction actuating unit 130 (the friction actuating unit 130 acting as the mover) is disposed between the friction drive unit 120 and the driven object. Thus, when the piezoelectric actuator 100 is turned on, the traveling wave or standing wave motion of the friction drive unit 120 drives the friction actuating unit 130 to move linearly. Specifically, the linear motion direction of the friction actuating unit 130 is opposite to the traveling wave or standing wave direction of the friction drive unit 120.

[0084] In order to ensure that the traveling wave or standing wave driving force provided by the friction driving part 120 can act on the friction actuating part 130, during the installation process, it is necessary to ensure that a certain pre-pressure is applied between the friction actuating part 130 and the piezoelectric actuator 100 so that the friction driving part 120 can conflict with the friction actuating part 130. In this way, the traveling wave or standing wave driving force provided by the friction driving part 120 can be more efficiently transmitted to the friction actuating part 130.

[0085] Figure 6 FIG2 shows a schematic diagram of a modified implementation of the piezoelectric actuator 100 according to an embodiment of the present application. Figure 6 As shown, in this embodiment, the piezoelectric actuator 100 further includes a friction connection layer 140 superimposed on the piezoelectric active part 110. Each of the friction drive elements 121 is coupled to the piezoelectric active part 110 by having its first end fixed to the friction connection layer 140. In this manner, the deformation of the piezoelectric active part 110 can be better transmitted to the friction drive part 120 through the friction connection layer 140. In particular, in this embodiment, the friction drive element 121 and the friction connection layer 140 may have an integral structure. Of course, in some examples, the friction drive element 121 and the friction connection layer 140 may have a separate structure, that is, they are separate components.

[0086] Furthermore, in an embodiment of the present application, the piezoelectric actuator 100 has a relatively more optimized size. From a quantitative point of view, the length dimension of the piezoelectric actuator 100 is less than or equal to 20 mm, preferably, the length dimension is less than or equal to 10 mm, for example, it can be 6 mm or 4.2 mm. The width dimension of the piezoelectric actuator 100 is less than or equal to 1 mm, preferably, the width dimension is less than or equal to 0.7 mm. The height dimension of the piezoelectric actuator 100 is less than or equal to 1 mm, where the height dimension of the piezoelectric actuator 100 is determined by the dimensions of the piezoelectric active portion 110 and the friction drive portion 120.

[0087] 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, which is sufficient to drive components weighing more than 100mg.

[0088] 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.

[0089] 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.

[0090] The piezoelectric actuator 100 has a relatively simple structure and an even simpler assembly structure. In addition, the sizes of its components such as the piezoelectric active part 110 and the friction drive part 120 are basically unrelated to the size of the motion stroke. Therefore, in optical zoom products, the piezoelectric actuator 100 can achieve advantages such as high thrust, small size, and light weight. At the same time, it can be designed to match a larger stroke or a heavier device weight, and the integration level in the design is also higher.

[0091] Furthermore, the piezoelectric actuator 100 pushes the object to be pushed to perform micron-level movement in a frictional contact manner. 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 and achieving high-precision continuous zoom. 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 during optical image stabilization.

[0092] After the piezoelectric actuator 100 is selected as a driver to drive the photosensitive component 10 for optical image stabilization, specifically, as follows Figure 1 and 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 piezoelectric actuators 100.

[0093] Accordingly, if Figure 1 and Figure 3 As shown, in this embodiment, the photosensitive component 10 is mounted on the first carrier frame 41, and the first driving element 42 is frictionally pressed against the first carrier frame 41 via the first pre-pressing component 43, and is configured to drive the first carrier frame 41 to move the photosensitive component 10 in a plane perpendicular to the optical axis to perform optical image stabilization in a first direction. The second carrier frame 44 is externally mounted on the first carrier frame 41, wherein the second driving element 45 is frictionally pressed against the second carrier frame 44 via the second pre-pressing component 46, and is configured to drive the second carrier frame 44 to move the first carrier frame 41 to move the photosensitive component 10 in a plane perpendicular to the optical axis to perform optical image stabilization in a second direction, wherein 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.

[0094] Here, the first driving element 42 abutting the first supporting frame 41 in a frictional contact manner means that there is a pre-pressure between the friction driving portion 120 of the first driving element 42 and the first supporting frame 41, so that the friction driving portion 120 of the first driving element 42 can drive the first supporting frame 41 by friction driving. Furthermore, the pre-pressure between the friction driving portion 120 of the first driving element 42 and the first supporting frame 41 can be direct pre-pressure or indirect pre-pressure, wherein direct pre-pressure means that the friction driving portion 120 of the first driving element 42 and the first supporting frame 41 are in direct contact to generate pre-pressure therebetween; indirect pre-pressure means that although the friction driving portion 120 of the first driving element 42 and the first supporting frame 41 are not in direct contact, there is still pre-pressure therebetween, so that the friction driving portion 120 of the first driving element 42 can drive the first supporting frame 41 by friction driving.

[0095] Accordingly, the second driving element 45 is in frictional contact with the second supporting frame 44, indicating that there is a preload between the friction driving portion 120 of the second driving element 45 and the second supporting frame 44, and thus the friction driving portion 120 of the second driving element 45 can drive the second supporting frame 44 by friction driving. Furthermore, the preload between the friction driving portion 120 of the second driving element 45 and the second supporting frame 44 can be direct preload or indirect preload, wherein direct preload means that the friction driving portion 120 of the second driving element 45 and the second supporting frame 44 are in direct contact to generate preload between the two; indirect preload means that although the friction driving portion 120 of the second driving element 45 and the second supporting frame 44 are not in direct contact, there is still preload between the two, so that the friction driving portion 120 of the second driving element 45 can drive the second supporting frame 44 by friction driving.

[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 by the first pre-pressing component 43. In this way, the first driving element 42 presses against the first supporting frame 41 in a frictional contact manner.

[0097] Accordingly, in this embodiment, the first pre-stressing component 43 includes a first elastic element 431, which is disposed between the piezoelectric active portion 110 of the first driving element 42 and the second supporting frame 44, so that the elastic force of the first elastic element 431 forces the first driving element 42 to press against the first supporting frame 41 in a frictional contact manner. In this embodiment, the friction driving portion 120 of the first driving element 42 directly presses against 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 120 of the first driving element 42 to press against the surface of the outer wall of the first supporting frame 41, thereby forming a frictional contact relationship between the two. In this way, after the first driving element 42 is turned on, the friction driving portion 120 of the first driving element 42 can drive the first supporting frame 41 to move along the first direction in a friction-driven manner, thereby driving 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 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 side wall of the second supporting frame 44 and the piezoelectric active portion 110 of the first driving element 42. After the adhesive is cured, the first elastic element 431 is formed between the piezoelectric active portion 110 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 side wall 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 3 As 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 pressed against the second supporting frame 44 in a frictional contact manner. Figure 1 As shown, the lens carrier of the lens assembly is carried on the outer frame 47.

[0100] Furthermore, if Figure 3 As shown, in this embodiment, the second pre-compression component 46 includes a second elastic element 461, which is disposed between the piezoelectric active portion 110 of the second driving element 45 and the outer frame 47. The elastic force of the second elastic element 461 forces the second driving element 45 to frictionally contact the second supporting frame 44. Accordingly, in this embodiment, the friction driving portion 120 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 120 of the second driving element 45 to contact the surface of the outer wall of the second supporting frame 44, forming a frictional contact relationship between the two. In this way, after the second driving element 45 is turned on, the friction driving portion 120 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 side wall of the outer frame 47 and the piezoelectric active portion 110 of the second driving element 45. After the adhesive is cured, the second elastic element 461 is formed between the piezoelectric active portion 110 of the second driving element 45 and the outer frame 47. It should be understood that in this example, the second elastic element 461 can provide preload while also securing the second driving element 45 to the surface of the inner side wall 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] 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 3 As 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.

[0104] 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 and the first driving element 42 are disposed in the same direction relative to each other. 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.

[0105] 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 and the second driving element 45 are disposed in the same direction relative to each other. 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.

[0106] 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.

[0107] In order to optimize the driving performance of the first driving element 42 and the second driving element 45, in other examples of the present application, as shown in FIG. Figure 7As 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 120 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 120 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 120 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 120 of the first driving element 42 can drive the first supporting frame 41 by friction driving.

[0108] 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 120 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.

[0109] More specifically, if Figure 1As 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 elements 121. In this way, the friction driving part 120 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 elements 121. In this way, the friction driving part 120 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.

[0110] It is worth mentioning that although Figure 4In the illustrated variant embodiment, 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 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.

[0111] It is also worth mentioning that in this modified embodiment, the length of the first friction actuating portion 131 is greater than the length of the first driving element 42, and the length of the second friction actuating portion 131 is greater than the length of the second driving element 43. In this way, when the first driving element 41 and the second driving element 42 respectively drive the first supporting frame 41 and the second supporting frame 44 in a friction-driven manner, the first supporting frame 41 and the second supporting frame 44 have sufficient travel to ensure the linearity of movement of the first supporting frame 41 and the second supporting frame 44. Of course, in other examples of the present application, the length of the first friction actuating portion 131 can also be less than or equal to the length of the first driving element 42, and the length of the second friction actuating portion 132 can also be less than or equal to the length of the second driving element 43, and this is not limited to the present application.

[0112] Figure 8 FIG2 is a schematic diagram showing another variant implementation of the camera module according to an embodiment of the present application. Figure 4In the example shown, in this modified example, the first supporting frame 41 has a first groove 410 formed concavely on its surface, and the friction driving portion 120 of the first driving element 42 is disposed in the first groove 410; the second supporting frame 44 has a second groove 440 formed concavely on its surface, and the friction driving portion 120 of the second driving element 45 is disposed in the second groove 440. That is, in this modified embodiment, the first driving element 42 is at least partially received in the first groove 410, and the second driving element 45 is at least partially received in the second groove 440. Preferably, a portion of the piezoelectric active portion 110 of the first driving element 42 is received in the first groove 410, and a portion of the piezoelectric active portion 110 of the second driving element 45 is received in the second groove 440.

[0113] In this way, when the first driving element 42 drives the first supporting frame 41 in the first groove 410, the first groove 410 itself forms a guide groove for guiding the movement of the first supporting frame 41. That is, in this modified embodiment, the first groove 410 not only provides an installation space for the installation of the first driving element 42, but also forms a guide structure for guiding the movement of the first supporting frame 41 (or, in other words, regulating the movement of the first driving element 42). Similarly, when the second driving element 45 drives the second supporting frame 44 in the second groove 440, the second groove 440 itself forms a guide groove for guiding the movement of the second supporting frame 44. That is, in this modified embodiment, the second groove 440 not only provides an installation space for the installation of the first driving element 42, but also forms a guide structure for guiding the movement of the second supporting frame 44 (or, in other words, regulating the movement of the second driving element 45).

[0114] In particular, in this modified embodiment, the length scale of the first driving element 42 and the second driving element 45 is smaller than the length dimension of the first groove 410 and the second groove 440, and the width dimension of the first driving element 42 and the second driving element 45 is slightly smaller than or equal to the width dimension of the first groove 410 and the second groove 440.

[0115] Figure 9 FIG2 is a schematic diagram showing another variant implementation of the camera module according to an embodiment of the present application. Figure 7In the illustrated example, in this modified example, the first supporting frame 41 has a first groove 410 formed concavely on its surface, and the first friction actuating portion 131 is disposed in the first groove 410; the second supporting frame 44 has a second groove 440 formed concavely on its surface, and the second friction actuating portion 132 is disposed in the second groove 440. That is, in this modified embodiment, the first driving element 42 is at least partially received in the first groove 410, and the second driving element 45 is at least partially received in the second groove 440. Preferably, a portion of the piezoelectric active portion 110 of the first driving element 42 is received in the first groove 410, and a portion of the piezoelectric active portion 110 of the second driving element 45 is received in the second groove 440.

[0116] In this way, when the first driving element 42 drives the first supporting frame 41 in the first groove 410, the first groove 410 itself forms a guide groove for guiding the movement of the first supporting frame 41. That is, in this modified embodiment, the first groove 410 not only provides an installation space for the installation of the first driving element 42, but also forms a guide structure for guiding the movement of the first supporting frame 41 (or, in other words, regulating the movement of the first driving element 42). Similarly, when the second driving element 45 drives the second supporting frame 44 in the second groove 440, the second groove 440 itself forms a guide groove for guiding the movement of the second supporting frame 44. That is, in this modified embodiment, the second groove 440 not only provides an installation space for the installation of the first driving element 42, but also forms a guide structure for guiding the movement of the second supporting frame 44 (or, in other words, regulating the movement of the second driving element 45).

[0117] In particular, in this modified embodiment, the length scale of the first driving element 42 and the second driving element 45 is smaller than the length dimension of the first groove 410 and the second groove 440, and the width dimension of the first driving element 42 and the second driving element 45 is slightly smaller than or equal to the width dimension of the first groove 410 and the second groove 440.

[0118] Figure 10 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.

[0119] Specifically, in Figure 1 and Figure 3In 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 10 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 .

[0120] In a specific example of this variant 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 contacted against the first supporting frame 41. The second driving element 45 is clamped and disposed between the second supporting frame 44 and the lens assembly 20 via the second pre-pressing component 46. In this manner, the second driving element 45 is frictionally contacted against the second supporting frame 44. Of course, in this variant embodiment, the outer frame 47 may also be provided with an inner extension arm, so that 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.

[0121] 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 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 11 shown.

[0122] Figure 12 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.

[0123] Specifically, if Figure 12 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 .

[0124] 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 contacted against 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 contacted against the second supporting frame 44.

[0125] 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 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 11 shown.

[0126] 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. Specifically, Figure 13 As shown, in other examples of the present application, the first pre-stressing component 43 includes a first magnetic element 52 arranged on the first supporting frame 41 and a second magnetic element 53 arranged on the second supporting frame 44 and corresponding to the first magnetic element 52, so as to force the first driving element 42 to press against the first supporting frame 41 in a frictional contact manner through the magnetic attraction between the first magnetic element 52 and the second magnetic element 53.

[0127] In this modified implementation, 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 metal such as iron, nickel, and 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.

[0128] The second pre-stressing component 46 includes a third magnetic element 62 arranged on the second supporting frame 44 and a fourth magnetic element 63 arranged on the lens assembly 20 and corresponding to the third magnetic element 62, so as to force the second driving element 45 to press against the second supporting frame 44 in a frictional contact manner through the magnetic attraction between the third magnetic element 62 and the fourth magnetic element 63.

[0129] In this modified implementation, 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 metals such as iron, nickel, and 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.

[0130] 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.

[0131] 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.

[0132] 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: A photosensitive component, comprising: a circuit board and a photosensitive chip electrically connected to the circuit board; a lens assembly, the lens assembly being held on the light-sensing path of the photosensitive assembly, the lens assembly comprising: a lens carrier and an optical lens mounted on the lens carrier, wherein the optical lens has an optical axis; and A driving assembly, the driving assembly comprising: a first carrying frame, a second carrying frame, a first driving element and a first pre-stressing component, wherein the photosensitive component is mounted on the first carrying frame, the second carrying frame is external to the first carrying frame, the first driving element is implemented as a piezoelectric actuator, wherein the first driving element is pressed against the first carrying frame in a frictional contact manner through the first pre-stressing component, and is configured to drive the first carrying frame to drive the photosensitive component to move along a first direction in a plane perpendicular to the optical axis to perform linear optical image stabilization in the first direction.

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 presses against the second supporting frame in a frictional contact manner through the second pre-stressing component, and is configured to drive the second supporting frame to drive the first supporting frame to drive the photosensitive component to move in a plane perpendicular to the optical axis for optical image stabilization.

3. The camera module according to claim 2, wherein: The piezoelectric actuator includes: a piezoelectric active part and a friction driving part that is rotatably connected to the piezoelectric active part. After the piezoelectric actuator is turned on, the friction driving part is configured to provide a driving force for driving the first supporting frame or the second supporting frame under the action of the piezoelectric active part.

4. The camera module according to claim 3, wherein: The piezoelectric active part has multiple groups of first polarization regions and second polarization regions that are alternately arranged, and the first polarization regions and the second polarization regions have opposite polarization directions. After the piezoelectric actuator is turned on, the multiple groups of first polarization regions and second polarization regions that are alternately arranged undergo deformation in different directions to drive the friction driving part to move along a preset direction in a traveling wave or standing wave manner to provide a driving force for driving the first supporting frame or the second supporting frame.

5. The camera module according to claim 4, wherein: The friction driving portion includes a plurality of friction driving elements spaced apart from each other, and a first end of each of the friction driving elements is coupled to the piezoelectric active portion.

6. The camera module according to claim 5, wherein: The piezoelectric actuator further includes a friction connection layer stacked on the piezoelectric active part, and each of the friction drive elements is coupled to the piezoelectric active part in such a manner that a first end of each of the friction drive elements is fixed to the friction connection layer.

7. The camera module according to claim 6, wherein: End surfaces of the second ends of the plurality of friction drive elements, which are opposite to the first ends, are located in the same plane.

8. The camera module according to claim 7, wherein: The driving assembly further includes a first friction actuating portion and a second friction actuating portion, wherein the first friction actuating portion is disposed between the first driving element and the first supporting frame, and the second friction actuating portion is disposed between the second driving element and the second supporting frame.

9. The camera module according to claim 8, wherein: The first friction actuating portion has a first surface and a second surface opposite to the first surface, the first surface abuts against the surface of the first supporting frame, and the second surface abuts against the end surface of the second end of at least one of the friction driving elements; the second friction actuating portion has a third surface and a fourth surface opposite to the third surface, the third surface abuts against the surface of the second supporting frame, and the fourth surface abuts against the end surface of the second end of at least one of the friction driving elements.

10. The camera module according to claim 9, wherein: The first supporting frame has a first groove formed concavely on its surface, and the first friction actuating part is arranged in the first groove; and / or the second supporting frame has a second groove formed concavely on its surface, and the second friction actuating part is arranged in the second groove.

11. The camera module according to claim 10, wherein: The lengths of the first groove and the second groove are greater than the length of the piezoelectric actuator, and the width of the piezoelectric actuator is less than or equal to the widths of the first groove and the second groove.

12. The camera module according to claim 3, wherein: The length of the piezoelectric actuator is less than or equal to 20 mm, the width of the piezoelectric actuator is less than or equal to 1 mm, and the height of the piezoelectric actuator is less than or equal to 1 mm.

13. The camera module according to claim 8, wherein: The first driving element is clamped between the first supporting frame and the second supporting frame by the first pre-compression component and the first friction actuating portion. In this way, the first driving element is pressed against the first supporting frame in a frictional contact manner.

14. The camera module according to claim 13, wherein: The first driving element is located on a side of the first carrying frame.

15. The camera module according to claim 13, wherein: The first driving element is located on the upper portion of the first supporting frame.

16. The camera module according to claim 13, wherein: The first driving element is located at the lower part of the first supporting frame.

17. The camera module according to claim 14, wherein: The drive assembly further includes an outer frame externally arranged on 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 pressed against the second supporting frame in a frictional contact manner, wherein the second drive element is located on the side of the second supporting frame.

18. The camera module according to claim 15, 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, in this way, the second driving element is pressed against the second supporting frame in a frictional contact manner, wherein the second driving element is located at the upper part of the second supporting frame.

19. The camera module according to claim 16, wherein: 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 by the second pre-pressing component and the second friction actuating part. In this way, the second driving element is pressed against the second supporting frame in a frictional contact manner, wherein the second driving element is located at the lower part of the second supporting frame.

20. The camera module according to claim 17, 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.

21. The camera module according to claim 18, 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.

22. The camera module according to claim 19, 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.

23. The camera module according to claim 20, wherein: The first pre-stressing component includes a first elastic element, which is arranged between the piezoelectric active part of the first driving element and the second supporting frame, so that the first driving element is forced to press against the first supporting frame in a frictional contact manner through the elastic force of the first elastic element; the second pre-stressing component includes a second elastic element, which is arranged between the piezoelectric active part of the second driving element and the outer frame, so that the second driving element is forced to press against the second supporting frame in a frictional contact manner through the elastic force of the second elastic element.

24. The camera module according to claim 21, wherein: The first pre-stressing component includes a first elastic element, which is arranged between the piezoelectric active part of the first driving element and the second supporting frame, so that the first driving element is forced to press against the first supporting frame in a frictional contact manner through the elastic force of the first elastic element; the second pre-stressing component includes a second elastic element, which is arranged between the piezoelectric active part of the second driving element and the lens carrier, so that the second driving element is forced to press against the second supporting frame in a frictional contact manner through the elastic force of the second elastic element.

25. The camera module according to claim 22, wherein: The first pre-stressing component includes a first elastic element, which is arranged between the piezoelectric active part of the first driving element and the second supporting frame, so that the first driving element is forced to press against the first supporting frame in a frictional contact manner through the elastic force of the first elastic element; the second pre-stressing component includes a second elastic element, which is arranged between the piezoelectric active part of the second driving element and the outer frame, so that the second driving element is forced to press against the second supporting frame in a frictional contact manner through the elastic force of the second elastic element.

26. The camera module according to any one of claims 23 to 25, wherein: The first elastic element and the second elastic element are implemented as adhesives having elasticity.

27. The camera module according to claim 26, wherein: The thickness of the first elastic element and the second elastic element is between 10um and 50um.

28. The camera module according to claim 20, wherein: 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 press against the first supporting frame in a frictional contact manner through the magnetic attraction between the first magnetic element and the second magnetic element; 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 second driving element to press against the second supporting frame in a frictional contact manner through the magnetic attraction between the third magnetic element and the fourth magnetic element.

29. The camera module according to claim 21, wherein: 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 press against the first supporting frame in a frictional contact manner through the magnetic attraction between the first magnetic element and the second magnetic element; 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 first driving element to press against the first supporting frame in a frictional contact manner through the magnetic attraction between the first magnetic element and the second magnetic element.

30. The camera module according to claim 22, wherein: 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 press against the first supporting frame in a frictional contact manner through the magnetic attraction between the first magnetic element and the second magnetic element; 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 second driving element to press against the second supporting frame in a frictional contact manner through the magnetic attraction between the third magnetic element and the fourth magnetic element.

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