camera module

Abstract

A camera module is disclosed, wherein the camera module has an image stabilization optical component on its imaging path, the image stabilization optical component being adapted to change the propagation path of the imaging light to perform optical image stabilization. Specifically, the camera module employs a novel piezoelectric actuator as a driver to meet the actuation requirements of the image stabilization optical component. Furthermore, a reasonable layout scheme is used to arrange the piezoelectric actuator within the camera module to further meet the structural and dimensional requirements of the camera module.

Description

Technical Field

[0001] This application relates to the field of camera modules, and more specifically to a camera module with optical image stabilization, wherein the camera module has an image stabilization optical component on its imaging path, the image stabilization optical component being adapted to change the propagation path of the imaging light to achieve optical image stabilization. In particular, the camera module employs a novel piezoelectric actuator as a driver to meet the actuation requirements of the image stabilization optical component. Furthermore, a reasonable layout scheme is used to arrange the piezoelectric actuator within the camera module to further meet the structural and dimensional requirements of the camera module. Background Technology

[0002] With the popularization of mobile electronic devices, the technology of camera modules used in mobile electronic devices to help users acquire images (such as videos or pictures) has 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] Camera modules in mobile electronic devices typically include features like autofocus and optical zoom. In recent years, to optimize image performance (especially image stability), optical image stabilization (OIS) has become a requirement. OIS compensates for image blur caused by hand movement or vibrations of the mobile electronic device itself. Mobile electronic devices usually incorporate multiple position sensors (e.g., angular velocity sensors) to detect vibrations and adjust the camera module's optical components (e.g., image sensor, lens) based on the detected angular velocity and direction of the vibration to achieve image stabilization.

[0004] To meet increasingly diverse market demands, high pixel counts, large sensor sizes, and small dimensions are an irreversible development trend for existing camera modules. As image sensors evolve towards higher pixel counts and larger sensor sizes, the size and weight of the optical components that are adapted to the image sensors are also gradually increasing, which brings new challenges to the drivers used to drive the optical components for optical image stabilization.

[0005] Specifically, existing actuators for driving optical components are electromagnetic motors, such as voice coil motors (VCMs) and shape memory alloy actuators (SMAs). However, with the increasing size and weight of optical components, existing electromagnetic motors are gradually becoming unable to provide sufficient driving force to move them. 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, existing actuators will not meet the application requirements of camera modules. Furthermore, existing electromagnetic actuators also suffer from electromagnetic interference problems.

[0006] Therefore, a new driving solution is needed to adapt to the implementation of optical image stabilization in camera modules. Summary of the Invention

[0007] One advantage of this application is that it provides a camera module that uses a novel piezoelectric actuator as a driving element to not only provide a sufficiently large driving force, but also to provide driving performance with higher precision and longer stroke, so as to meet the driving requirements of the optical image stabilization of the camera module.

[0008] Other advantages and features of this application will become apparent from the following description and can be realized by means and combinations particularly pointed out in the claims.

[0009] To achieve at least one of the above advantages, this application provides a camera module comprising:

[0010] The image stabilization optical component includes an optical deflection element and a first optical correction element and a second optical correction element held in the optical deflection path of the optical deflection element, wherein the optical deflection element is configured to receive imaging light from the outside and deflect the imaging light.

[0011] A lens group is held in the light transmission path of the image stabilization optical component, wherein the lens group is provided with an optical axis, and the first optical correction element and the second optical correction element are coaxially arranged with the optical axis as the axis;

[0012] A photosensitive component held in the light-transmitting path of the lens group; and

[0013] The driving assembly includes a first driving element and a second driving element, wherein the first driving element and the second driving element are implemented as piezoelectric actuators, wherein the first driving element is configured to drive the first optical correction element to rotate about the optical axis, and the second driving element is configured to drive the second optical correction element to rotate about the optical axis, thereby making the relative positional relationship between the first optical correction element and the second optical correction element adjustable to change the propagation path of the imaging light for optical image stabilization.

[0014] In the camera module according to this application, the first optical correction element and the second optical correction element are implemented as wedge-shaped optical lenses, the wedge-shaped optical lenses having opposing vertical optical surfaces and tilted optical surfaces, wherein the tilted optical surfaces of the first optical correction element and the tilted optical surfaces of the second optical correction element are arranged opposite to each other.

[0015] In the camera module according to this application, the first driving element is configured to drive the first optical correction element to rotate about the optical axis in a first direction, and the second driving element is configured to drive the second optical correction element to rotate about the optical axis in a second direction, wherein the first direction is opposite to the second direction. In this way, the optical deflection element, the first optical correction element, and the second optical correction element of the image stabilization optical assembly satisfy the following positional relationship:

[0016] |2np×θw×sinθr|≥|90-θp|

[0017] Wherein, np is the refractive index of the optical deflection element, θp is the angle value of the first included angle, θw is the angle value of the second included angle, and θr is half of the angle formed between the axis of symmetry of the first optical correction element and the axis of symmetry of the second optical correction element. The first included angle is the angle formed between the light-emitting surface of the optical deflection element and the optical axis, and the second included angle is the angle formed between the light tilting surface of the first or second optical correction element and the optical axis.

[0018] In the camera module according to this application, the first driving element has a first light-transmitting hole, and the second driving element has a second light-transmitting hole. The first driving element is mounted on the edge region of the vertical optical surface of the first light correction element, and the mounting position allows the imaging light from the light deflection element to pass through the first light-transmitting hole of the first driving element to the first light correction element. The second driving element is mounted on the edge region of the vertical optical surface of the second light correction element, and the mounting position allows the imaging light entering the second light correction element from the inclined optical surface of the second light correction element to pass through the second light-transmitting hole of the second driving element to the second light correction element.

[0019] In the camera module according to this application, the piezoelectric actuator has a ring structure.

[0020] In the camera module according to this application, the first optical correction element has a first mounting groove recessed in the edge region of its vertical optical surface, and the first driving element is mounted in the edge region of the vertical optical surface of the first optical correction element in such a way as to be mounted in the first mounting groove; the second optical correction element has a second mounting groove recessed in the edge region of its vertical optical surface, and the second driving element is mounted in the edge region of the vertical optical surface of the second optical correction element in such a way as to be mounted in the second mounting groove.

[0021] In the camera module according to this application, the first driving element is attached to the bottom surface of the first mounting groove by an adhesive, and the second driving element is attached to the bottom surface of the second mounting groove by an adhesive.

[0022] In the camera module according to this application, the piezoelectric actuator includes a ring-shaped piezoelectric structure and a drive circuit system electrically connected to the ring-shaped piezoelectric structure, wherein the ring-shaped piezoelectric structure, under the control of the drive circuit system, takes on a wavy shape to generate a driving force for rotating the first optical correction element or the second optical correction element.

[0023] In the camera module according to this application, the annular piezoelectric structure includes: a first piezoelectric structure, a second piezoelectric structure, and a first spacer region and a second spacer region extending between the first piezoelectric structure and the second piezoelectric structure, wherein the first spacer region and the second spacer region are grounded.

[0024] In the camera module according to this application, the first piezoelectric structure and the second piezoelectric structure have a C-shaped structure.

[0025] In the camera module according to this application, the first piezoelectric structure includes multiple sets of alternating first piezoelectric segments and second piezoelectric segments, the first piezoelectric segments and the second piezoelectric segments having opposite polarization directions; the second piezoelectric structure includes multiple sets of alternating third piezoelectric segments and fourth piezoelectric segments, the third piezoelectric segments and the fourth piezoelectric segments having opposite polarization directions.

[0026] In the camera module according to this application, the first optical correction element and the second optical correction element are implemented as cylindrical optical lenses, the cylindrical optical lenses having a first optical surface and a second optical surface, wherein the cylindrical optical lens includes a plurality of microstructures formed on its second optical surface, each of the microstructures having an inclined optical surface.

[0027] The further objectives and advantages of this application will become fully apparent from the following description and accompanying drawings.

[0028] These and other objects, features and advantages of this application are fully apparent from the following detailed description, the accompanying drawings and the claims. Attached Figure Description

[0029] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0030] Figure 1 The illustration shows a schematic diagram of a camera module according to an embodiment of this application.

[0031] Figure 2 The illustration shows a perspective view of the light correction element in the image stabilization optical assembly of the camera module according to an embodiment of this application.

[0032] Figure 3 The illustration shows a schematic diagram of the optical path of the camera module according to an embodiment of the present application after the optical correction element is rotated.

[0033] Figure 4 The figure shows a schematic diagram of the rotation direction of the first optical correction element and the second optical correction element of the camera module according to an embodiment of the present application when they rotate relative to each other.

[0034] Figure 5 A schematic diagram of the piezoelectric actuator according to an embodiment of this application is shown.

[0035] Figure 6 The illustration shows a schematic diagram of a modified embodiment of the optical correction element according to an embodiment of this application. Detailed Implementation

[0036] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0037] Exemplary camera module

[0038] Figure 1 The illustration shows a schematic diagram of the camera module according to an embodiment of the present application, wherein the camera module is provided with an image stabilization optical component 10 on its imaging path, and the image stabilization optical component 10 is adapted to change the propagation path of the imaging light to perform optical image stabilization.

[0039] like Figure 1 As shown, the camera module according to the embodiments of this application includes: a stabilizing optical component 10, a lens group 20 held on the light transmission path of the stabilizing optical component 10, a photosensitive component 30 held on the light transmission path of the lens group 20, and a driving component 40 for driving at least a portion of the stabilizing optical component 10 to perform optical image stabilization, wherein the lens group 20 is provided with an optical axis.

[0040] Accordingly, in this embodiment, the image stabilization optical component 10 includes a light-reversing element 11 and at least two light-correcting elements held in the light-reversing path of the light-reversing element 11, wherein the light-reversing element 11 is configured to receive imaging light from the outside and revers the imaging light. Figure 1 As shown, in this embodiment, the light-deflecting element 11 is implemented as a light-deflecting prism, which has a light-incident surface, a light-exit surface, and a light-reflecting surface. Imaging light rays from the outside enter the light-deflecting element 11 from the light-incident surface and undergo a near 90° deflection at the light-reflecting surface before exiting the light-deflecting element 11 from the light-exit surface. Here, considering manufacturing tolerances, in actual operation, the angle at which the light-deflecting element 11 deflects the imaging light rays may have an error within 1°, which should be understood by those skilled in the art.

[0041] In a specific example, the image stabilization optical component 10 further includes a mounting carrier 13, on which the optical reversing element 11 is mounted by means of its optical reversing surface being attached to the support surface of the mounting carrier 13 with an adhesive. This effectively prevents the optical reversing element 11 from sliding or moving relative to the mounting carrier 13, thereby ensuring the stability of the mounting position of the optical reversing element 11.

[0042] In particular, in this embodiment, the light-deflecting element 11 has a special positional configuration to meet the requirements of the image stabilization optical component 10. Specifically, the light incident surface of the light-deflecting element 11 is parallel to the optical axis, and the light exiting surface has a first angle with the optical axis. The angle between the light exiting surface and the light incident surface is equal to the angle value of the first angle.

[0043] It is worth mentioning that in other examples of this application, the light-deflecting element 11 can also be implemented as other types of optical elements, such as a mirror, and this is not limited to this application. Furthermore, in the embodiments of this application, the camera module can also include a greater number of light-deflecting elements 11. One reason for this is that one function of introducing the light-deflecting element 11 is to deflect the imaging light rays, enabling structural folding of the optical system of the camera module with a long total track length (TTL). Accordingly, when the total track length (TTL) of the camera module is too long, a greater number of light-deflecting elements 11 can be provided to meet the size requirements of the camera module. For example, the light-deflecting element 11 can be placed on the image side of the camera module or between any two lenses in the lens group 20.

[0044] Furthermore, to achieve the optical image stabilization requirement, the image stabilization optical component 10 further includes at least two optical correction elements, wherein the at least two optical correction elements form an imaging correction element. In this embodiment, taking the imaging correction element comprising two optical correction elements as an example, that is, the imaging correction element includes a first optical correction element 12 and a second optical correction element 14. It should be understood that in other embodiments of this application, the imaging correction unit may also include a greater number of optical correction elements, and this is not limited to this application.

[0045] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the first optical correction element 12 and the second optical correction element 14 are implemented as wedge-shaped optical lenses, wherein the first optical correction element 12 and the second optical correction element 14 have a minimum thickness dimension and a maximum thickness dimension at their respective first edge and second edge, respectively, the line connecting the first edge and the second edge forms the axis of symmetry of the first optical correction element 12 and the second optical correction element 14, and the thickness dimension of the first optical correction element 12 and the second optical correction element 14 gradually changes from the minimum thickness dimension to the maximum thickness dimension along their respective axes of symmetry.

[0046] Furthermore, the first optical correction element 12 and the second optical correction element 14 each have opposing vertical optical surfaces and tilted optical surfaces, wherein the tilted optical surfaces of the first optical correction element 12 and the tilted optical surfaces of the second optical correction element 14 are arranged opposite to each other. Specifically, in this embodiment, the vertical optical surface of the first optical correction element 12 faces the light-shifting element 11, the tilted optical surface of the first optical correction element 12 faces the tilted optical surface of the second optical correction element 14, and the vertical optical surface of the second optical correction element 14 faces the lens group 20.

[0047] Specifically, in this embodiment, both the first optical correction element 12 and the second optical correction element 14 can rotate relative to the optical axis under the action of the driving assembly 40 to achieve the function of optical jitter compensation. The following will be paired with... Figure 3 The correction process when the first optical correction element 12 and the second optical correction element 14 rotate relative to the lens group 20 and the optical deflection element 11 will be further explained.

[0048] like Figure 3 As shown, when the optical correction element rotates an angle relative to the optical axis, the imaging position of the light beam L incident on the imaging surface IS through the optical correction element changes, moving from the first position P1 to the second position P2. Furthermore, in this embodiment, the rotation directions of the first optical correction element 12 and the second optical correction element 14 relative to the optical axis are opposite to each other. For example, as... Figure 4 As shown, when viewed from the first optical correction element 12 and the second optical correction element 14 towards the imaging plane IS, the rotation direction of the first optical correction element 12 is counterclockwise, while the rotation direction of the second optical correction element 14 is clockwise. Thus, by configuring the first optical correction element 12 and the second optical correction element 14, which are rotatable relative to the optical axis, the imaging correction element achieves the function of optical jitter compensation, thereby possessing the advantages of low power consumption and high efficiency.

[0049] Furthermore, in this embodiment, the optical deflection element 11, the first optical correction element 12, and the second optical correction element 14 of the image stabilization optical assembly 10 satisfy the following positional relationship:

[0050] |2np×θw×sinθr|≥|90-θp|

[0051] Wherein, np is the refractive index of the light-converting element 11, θp is the angle value of the first included angle, θw is the angle value of the second included angle, and θr is half of the angle formed between the axis of symmetry of the first light-correcting element 12 and the axis of symmetry of the second light-correcting element 14. The first included angle is the angle formed between the light-emitting surface of the light-converting element 11 and the optical axis, and the second included angle is the angle formed between the light-tilting surface of the first light-correcting element 12 or the second light-correcting element 14 and the optical axis.

[0052] Furthermore, such as Figure 1 and Figure 2As shown, in this embodiment, the lens group 20 corresponds to the imaging correction element and includes at least one optical lens. Those skilled in the art will understand that the resolving power of the lens group 20 is proportional to the number of optical lenses within a certain range; that is, the higher the resolving power, the more optical lenses there are. In some embodiments, the lens group 20 further includes a lens barrel for housing the at least one optical lens therein. Furthermore, the lens group 20 can be implemented as a one-piece lens or a separate lens. When the lens group 20 is implemented as a one-piece lens, it includes a lens barrel in which all the optical lenses are mounted; while when the lens group 20 is implemented as a separate optical lens, it is assembled from at least two individual lens units.

[0053] like Figure 1 and Figure 2 As shown, in this embodiment of the application, the photosensitive component 30 corresponds to the lens group 20 and is used to receive imaging light from the lens group 20 and perform imaging. The photosensitive component 30 includes a circuit board, a photosensitive chip 31 electrically connected to the circuit board, and a filter element held in the photosensitive path of the photosensitive chip 31. More specifically, in... Figure 2 In the illustrated example, the photosensitive component 30 further includes a bracket disposed on the circuit board, wherein the filter element is mounted on the bracket to be held in the photosensitive path of the photosensitive chip 31.

[0054] It is worth mentioning that, in other examples of this application, the specific implementation of holding the filter element on the photosensitive path of the photosensitive chip 31 is not limited to this application. For example, the filter element may be implemented as a filter film and coated on the surface of an optical lens of the lens group 20 to achieve the effect of filtering light. As another example, the photosensitive assembly 30 may further include a filter element bracket (not shown in the figure) mounted on the bracket, wherein the filter element is held on the photosensitive path of the photosensitive chip 31 by being mounted on the filter element bracket.

[0055] As mentioned earlier, to meet increasingly diverse market demands, high pixel counts, large chip sizes, and small dimensions are an irreversible development trend for existing camera modules. As the image sensor 31 evolves towards higher pixel counts and larger chip sizes, the size and weight of the optical components adapted to it also gradually increase, posing new challenges to the drivers used to drive these optical components for optical image stabilization. In this embodiment, as the image sensor 31 develops towards higher pixel counts and larger chip sizes, the size and weight of the optical correction element of the imaging correction element gradually increase, which places new technical requirements on the drivers used to drive the imaging correction element.

[0056] The new technical requirements mainly focus on two aspects: relatively greater driving force and superior driving performance (specifically including higher precision drive control and longer drive stroke). Furthermore, in addition to finding drivers that meet the new technical requirements, the selection of new drivers also needs to consider their adaptability to the current trend of camera modules becoming lighter and thinner.

[0057] Through research and experimentation, the inventors of this application have proposed a piezoelectric actuator with a novel structure, which can meet the technical requirements of the camera module for the actuator. Furthermore, the piezoelectric actuator is arranged within the camera module in a suitable manner to meet the structural and dimensional design requirements of the camera module.

[0058] Figure 5 A schematic diagram of the piezoelectric actuator according to an embodiment of this application is illustrated. Figure 5 As shown in the embodiment of this application, the piezoelectric actuator 100 includes an annular piezoelectric structure 110 and a driving circuit system electrically connected to the annular piezoelectric structure 110, wherein the annular piezoelectric structure 110, under the control of the driving circuit system, takes on a wavy shape to generate a driving force for rotating the first optical correction element 12 or the second optical correction element 14.

[0059] Specifically, the annular piezoelectric structure 110 includes: a first piezoelectric structure 111, a second piezoelectric structure 112, and a first spacing region 113 and a second spacing region 114 extending between the first piezoelectric structure 111 and the second piezoelectric structure 112, wherein the first spacing region 113 and the second spacing region 114 are grounded. In particular, in this embodiment, the first piezoelectric structure 111 and the second piezoelectric structure 112 have a C-shaped structure. The first piezoelectric structure 111 and the second piezoelectric structure 112 have different wavelengths, differing by half a wavelength. The polarization direction of the first piezoelectric structure 111 is set to be opposite to the polarization direction of the second piezoelectric structure 112.

[0060] In other examples of this application, the first piezoelectric structure 111 and the second piezoelectric structure 112 can also be configured as a combination of several piezoelectric plates, with adjacent piezoelectric plates having opposite polarization directions. That is, in this embodiment, the first piezoelectric structure 111 includes multiple sets of alternating first and second piezoelectric segments, with the first and second piezoelectric segments having opposite polarization directions; the second piezoelectric structure 112 includes multiple sets of alternating third and fourth piezoelectric segments, with the third and fourth piezoelectric segments having opposite polarization directions. When a voltage is applied to the first piezoelectric structure 111 and the second piezoelectric structure 112, the polarization directions of two adjacent piezoelectric ends are opposite, one piezoelectric end contracts, and the adjacent piezoelectric segment extends.

[0061] The surface of the annular piezoelectric structure 110 is electroplated with a metal material layer for electrical connection with the circuit board of the photosensitive component 30 to conduct electricity to the annular piezoelectric structure 110. Pins are provided on the lower surface of the annular piezoelectric junction, which are electrically connected to the circuit board. In this embodiment, the annular piezoelectric junction is formed by bonding two identical piezoelectric bodies together, i.e., by bonding the first piezoelectric structure 111 and the second piezoelectric structure 112. When AC voltages with a time difference of 90° electrical angle are applied, the first piezoelectric structure 111 and the second piezoelectric structure 112 respectively undergo standing wave vibration. It can be considered that each particle on the surface of the annular piezoelectric structure 110 forms an ultrasonic micro-vibration with a certain trajectory, typically an elliptical trajectory. The vibration wave synthesized by the standing wave vibrations of the first piezoelectric structure 111 and the second piezoelectric structure 112 is a traveling wave that progresses with time; that is, the piezoelectric actuator 100 is a traveling wave vibration piezoelectric actuator 100.

[0062] When the piezoelectric actuator 100 is selected as the driver for driving the image stabilization optical component 10, in this embodiment of the application, the driving component 40 includes a first driving element 41 and a second driving element 42. The first driving element 41 and the second driving element 42 are implemented as piezoelectric actuators 100. The first driving element 41 is configured to drive the first optical correction element 12 to rotate around the optical axis, and the second driving element 42 is configured to drive the second optical correction element 14 to rotate around the optical axis. In this way, the relative positional relationship between the first optical correction element 12 and the second optical correction element 14 can be adjusted to change the propagation path of the imaging light to achieve optical image stabilization.

[0063] More specifically, since the piezoelectric actuator 100 has a ring structure, it naturally forms a light-transmitting aperture. That is, in this embodiment, the first driving element 41 has a first light-transmitting aperture, and the second driving element 42 has a second light-transmitting aperture. The first driving element 41 is mounted on the edge region of the vertical optical surface of the first optical correction element 12, and the imaging light from the light deflection element 11 can pass through the first light-transmitting aperture of the first driving element 41 to the first optical correction element 12. The second driving element 42 is mounted on the edge region of the vertical optical surface of the second optical correction element 14, and the imaging light entering the second optical correction element 14 from the inclined optical surface of the second optical correction element 14 can pass through the second light-transmitting aperture of the second driving element 42.

[0064] In other words, in this embodiment, selecting the piezoelectric actuator 100 as the driver for the image stabilization optical component 10 not only meets the driving requirements of optical image stabilization, but also ensures that the piezoelectric actuator 100 does not affect the propagation of normal imaging light. Furthermore, when the first driving element 41 is mounted on the edge region of the vertical optical surface of the first optical correction element 12, the first driving element 41 also forms a grating for the first optical correction element 12. That is, the first driving element 41 can also prevent stray light from entering the first optical correction element 12 to improve image quality. Similarly, when the second driving element 42 is mounted on the edge region of the vertical optical surface of the second optical correction element 14, the second driving element 42 forms a grating for the second optical correction element 14 to constrain the light-emitting aperture of the second optical correction element 14.

[0065] In a specific example of this application, the first optical correction element 12 has a first mounting groove recessed in the edge region of its vertical optical surface, and the first driving element 41 is mounted in the first mounting groove in the edge region of the vertical optical surface of the first optical correction element 12. Here, the adhesive is preferably a flexible material adhesive layer, such as epoxy resin, which can linearly transmit the frictional force generated by the deformation of the piezoelectric actuator 100 to the first optical correction element 12.

[0066] Correspondingly, the second optical correction element 14 has a second mounting groove recessed in the edge region of its vertical optical surface, and the second drive element 42 is mounted in the edge region of the vertical optical surface of the second optical correction element 14 in such a way as to be mounted in the second mounting groove. Here, the adhesive is preferably a flexible material adhesive layer, such as epoxy resin, which can linearly transmit the frictional force generated by the deformation of the piezoelectric actuator 100 to the second optical correction element 14.

[0067] During operation, when the drive circuit system of the piezoelectric actuator 100 applies a positive voltage to the annular piezoelectric structure 110, the annular piezoelectric structure 110 generates a traveling wave that propagates over time. The microscopic vibration generated by the annular piezoelectric structure 110 macroscopically manifests as a regular deformation of the annular piezoelectric structure 110. Simultaneously, the surface of the annular piezoelectric structure 110 is provided with the first optical correction element 12 or the second optical correction element 14. The microscopic vibration generated by the energized annular piezoelectric structure 110, through the frictional action between the surface of the annular piezoelectric structure 110 and the surface of the first optical correction element 12 or the second optical correction element 14, causes the first optical correction element 12 or the second optical correction element 14 to perform a continuous macroscopic rotational motion in a clockwise direction, which is the opposite direction to the propagation direction of the traveling wave, thereby driving the first optical correction element 12 or the second optical correction element 14 to rotate.

[0068] When the drive circuit system of the piezoelectric actuator 100 applies a reverse voltage to the annular piezoelectric structure 110, the annular piezoelectric structure 110 generates a traveling wave that propagates over time. The micro-vibration generated by the annular piezoelectric structure 110 is macroscopically manifested as a regular deformation of the annular piezoelectric structure 110. At the same time, the surface of the annular piezoelectric structure 110 is provided with the first optical correction element 12 or the second optical correction element 14. Thus, the micro-vibration generated by the energized annular piezoelectric structure 110, through the friction between the surface of the annular piezoelectric structure 110 and the surface of the first optical correction element 12 or the second optical correction element 14, causes the first optical correction element 12 or the second correction element to perform a continuous macroscopic rotational motion in the counterclockwise direction, that is, in the opposite direction of the traveling wave propagation direction, thereby driving the first optical correction element 12 or the second correction element to rotate.

[0069] In this embodiment of the application, the first driving element 41 is configured to drive the first optical correction element 12 to rotate around the optical axis, and the second driving element 42 is configured to drive the second optical correction element 14 to rotate around the optical axis. In this way, the relative positional relationship between the first optical correction element 12 and the second optical correction element 14 can be adjusted to change the propagation path of the imaging light to achieve optical image stabilization.

[0070] In summary, the camera module described in the embodiments of this application is illustrated, which is provided with an image stabilization optical component 10 in its imaging path. The image stabilization optical component 10 is adapted to change the propagation path of the imaging light to perform optical image stabilization. In particular, the camera module uses a novel piezoelectric actuator 100 as a driver to meet the actuation requirements of the image stabilization optical component 10. Furthermore, a reasonable layout scheme is adopted to arrange the piezoelectric actuator 100 within the camera module to further meet the structural and dimensional requirements of the camera module.

[0071] Figure 6 The illustration shows a schematic diagram of a modified embodiment of the camera module according to an embodiment of this application. In this modified embodiment, the type and structure of the first light correction element 12 and the second light correction element 14 are adjusted.

[0072] Specifically, such as Figure 6 As shown, in this modified embodiment, the first optical correction element 12 and the second optical correction element 14 are implemented as cylindrical optical lenses, the cylindrical optical lenses having a first optical surface and a second optical surface, wherein the cylindrical optical lens includes a plurality of microstructures formed on its second optical surface, each of the microstructures having an inclined optical surface.

[0073] More specifically, in this modified embodiment, each of the microstructures has an inclined optical surface, each of the inclined optical surfaces being inclined relative to the optical axis, and the first optical correction element 12 and the second optical correction element 14 are rotatable relative to the optical axis to correct the travel direction of the light beam passing through the imaging correction unit. In a specific example, the angle between the inclined optical surfaces of the first optical correction element 12 and / or the second optical correction element 14 and the optical axis is greater than 45 degrees and less than 90 degrees. The second optical surfaces of the first optical correction element 12 and the second optical correction element 14 are surrounded by a flat surface, and each of the microstructures protrudes or is recessed relative to the flat surface, wherein the angle between the inclined optical surfaces of the first optical correction element 12 and the second optical correction element 14 and the flat surface is between 0 degrees and 45 degrees.

[0074] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. An image capturing module, comprising: The application relates to an optical image stabilization device, comprising: an optical image stabilization assembly, comprising a light folding element and a first light correction element and a second light correction element held in a light folding path of the light folding element, wherein the light folding element is configured to receive and fold an imaging light from an external environment; a lens group held in a light path of the optical image stabilization assembly, wherein the lens group is provided with an optical axis, and the first light correction element and the second light correction element are coaxially arranged along the optical axis; a light sensing assembly held in a light path of the lens group; and a driving assembly, comprising a first driving element and a second driving element, wherein the first driving element and the second driving element are implemented as piezoelectric actuators, the first driving element is configured to drive the first light correction element to rotate around the optical axis, and the second driving element is configured to drive the second light correction element to rotate around the optical axis, so that the relative position relationship between the first light correction element and the second light correction element can be adjusted to change the propagation path of the imaging light for optical image stabilization. The first driving element is configured to drive the first light correction element to rotate around the optical axis in a first direction, and the second driving element is configured to drive the second light correction element to rotate around the optical axis in a second direction, wherein the first direction is opposite to the second direction, so that the light folding element, the first light correction element and the second light correction element of the optical image stabilization assembly satisfy the following position relationship: |2np x θ w x sin θ r | ≥ |90 - θ p | wherein np is the refractive index of the light-turning element, θ p is an angle value of a first included angle, and θ w is an angle value of a second included angle, and θ p is one-half of an included angle between a symmetry axis of the first light-correcting element and a symmetry axis of the second light-correcting element, wherein the first included angle is an included angle between the light-turning element and the optical axis, and the second included angle is an included angle between a light-tilting surface of the first light-correcting element or the second light-correcting element and the optical axis.

2. The camera module of claim 1, wherein, The first driving element has a first light transmission hole, and the second driving element has a second light transmission hole, wherein the first driving element is mounted to the edge region of the vertical optical surface of the first light correction element, so that the imaging light from the light folding element can pass through the first light correction element through the first light transmission hole of the first driving element; and the second driving element is mounted to the edge region of the vertical optical surface of the second light correction element, so that the imaging light entering the second light correction element from the inclined optical surface of the second light correction element can pass out through the second light transmission hole of the second driving element.

3. The camera module of claim 2, wherein, The piezoelectric actuator has a ring structure.

4. The camera module of claim 3, wherein, ​ 5. The camera module of claim 4, wherein, The first light correction element has a first mounting groove recessed in an edge region of a vertical optical surface thereof, and the first driving element is mounted to an edge region of a vertical optical surface of the first light correction element in a manner of being mounted to the first mounting groove; the second light correction element has a second mounting groove recessed in an edge region of a vertical optical surface thereof, and the second driving element is mounted to an edge region of a vertical optical surface of the second light correction element in a manner of being mounted to the second mounting groove.

6. The camera module of claim 5, wherein, The first driving element is attached to a bottom surface of the first mounting groove by an adhesive, and the second driving element is attached to a bottom surface of the second mounting groove by an adhesive.

7. The camera module of claim 5, wherein, The piezoelectric actuator comprises a ring-shaped piezoelectric structure and driving circuitry electrically connected to the ring-shaped piezoelectric structure, wherein the ring-shaped piezoelectric structure is corrugated under the control of the driving circuitry to generate a driving force for rotating the first light correction element or the second light correction element.

8. The camera module of claim 7, wherein, The ring-shaped piezoelectric structure comprises a first piezoelectric structure, a second piezoelectric structure, and first and second spacing regions extending between the first and second piezoelectric structures, wherein the first and second spacing regions are grounded.

9. The camera module of claim 8, wherein, The first and second piezoelectric structures have a C-shaped structure.

10. The camera module of claim 8, wherein, The first piezoelectric structure comprises a plurality of groups of first and second piezoelectric segments alternately arranged with each other, the first and second piezoelectric segments having opposite polarization directions; and the second piezoelectric structure comprises a plurality of groups of third and fourth piezoelectric segments alternately arranged with each other, the third and fourth piezoelectric segments having opposite polarization directions.

11. The camera module of claim 1, wherein, The first and second light correction elements are implemented as cylindrical optical lenses having first and second optical surfaces, wherein the cylindrical optical lenses comprise a plurality of microstructures formed in the second optical surfaces thereof, each of the microstructures having an inclined optical surface.

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