Camera module and electronic device

Abstract

An embodiment of the present application provides an imaging module and an electronic device. The imaging module includes: a housing assembly; a carrier movably mounted on the housing assembly; a lens mounted on the carrier; and a driving assembly including an elastic member, a piezoelectric body, and a friction plate. The friction plate is mounted on the housing assembly, the piezoelectric body is mounted on the carrier through the elastic member, and the piezoelectric body can move relative to the friction plate. The friction plate and the housing assembly serve as a stator, and the piezoelectric body and the carrier serve as a rotor. The piezoelectric body generates power through vibration friction and can move relative to the friction plate to drive the entire carrier and the lens to move, thereby realizing the movement of the lens relative to the housing assembly. The driving assembly adopts a piezoelectric mode of driving and does not require electromagnetic mode driving through a magnet and a coil, which can solve the problem that the magnetic field generated by the magnet and the coil interferes with other magnetic components.

Description

Technical Field

[0001] The present application relates to the field of electronic technologies, and in particular, to an imaging module and an electronic device. Background Art

[0002] With the development of portable mobile terminals such as smart phones and tablet computers, and intelligent wearable devices, users' demand for the image quality of terminal devices is increasing day by day. Under this premise, the volume and weight of the imaging module also increase accordingly. Furthermore, for an imaging module with an autofocus (AF) function, the performance requirements of the AF motor (such as thrust, stroke, speed, etc.) are also getting higher and higher. Currently, the vast majority of imaging module AFs adopt an electromagnetic mode (such as a voice coil motor). Due to the limitations of the magnetic field distribution of the magnet and the number of turns of the coil in the electromagnetic solution itself, if the AF performance requirements are to be met, a larger volume is required to place a sufficiently large magnet and coil to achieve it. However, a larger magnet and coil will generate a larger magnetic field, which will interfere with other magnetic components. Summary of the Invention

[0003] Embodiments of the present application provide an imaging module and an electronic device, which can solve the problem of magnetic field interfering with other magnetic components.

[0004] Embodiments of the present application provide an imaging module, which includes:

[0005] A housing assembly having an accommodation space;

[0006] A carrier, at least partially movably installed in the accommodation space;

[0007] A lens mounted on the carrier; and

[0008] A driving assembly disposed between the housing assembly and the carrier, the driving assembly includes an elastic member, a piezoelectric body and a friction plate, the friction plate is mounted on a side of the housing assembly facing the carrier, the piezoelectric body is mounted on a side of the carrier facing the housing assembly through the elastic member, and the piezoelectric body abuts against the friction plate and can move relative to the friction plate.

[0009] Embodiments of the present application further provide an electronic device, which includes:

[0010] A housing; and

[0011] An imaging module mounted in the housing.

[0012] In the embodiments of the present application, a driving component is provided between the housing component of the camera module and the carrier. The driving component includes an elastic member, a piezoelectric body, and a friction plate. The friction plate is installed on the side of the housing component facing the carrier. The friction plate and the housing component serve as the stator, and the piezoelectric body is installed on the side of the carrier facing the housing component through the elastic member. The piezoelectric body and the carrier serve as the mover. The piezoelectric body abuts against the friction plate. The piezoelectric body generates power through vibration friction and can move relative to the friction plate to drive the entire carrier and the lens to move, thereby realizing the movement of the lens relative to the housing component. The driving component adopts a piezoelectric mode of driving and does not require electromagnetic mode driving through a magnet and a coil, which can solve the problem of the magnetic field generated by the magnet and the coil interfering with other magnetic components. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] In order to more fully understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0015] Figure 1 It is a schematic structural diagram of the camera module provided by the embodiments of the present application.

[0016] Figure 2 is Figure 1 an exploded schematic diagram of the shown camera module.

[0017] Figure 3 is Figure 1 a schematic structural diagram of the shown camera module from another angle.

[0018] Figure 4 is Figure 3 a sectional view of the shown camera module along the BB direction.

[0019] Figure 5 is Figure 3 a sectional view of the shown camera module along the CC direction.

[0020] Figure 6 is Figure 1 a schematic structural diagram of the shown camera module from another angle.

[0021] Figure 7 is Figure 6 a sectional view of the shown camera module along the ZZ direction.

[0022] Figure 8 is Figure 3Schematic diagram of the structure of the carrier and the guiding member in the illustrated camera module.

[0023] Figure 9 is Figure 3 Schematic diagram of the structure of the housing assembly in the illustrated camera module.

[0024] Figure 10 is Figure 1 Schematic diagrams of different modes of the piezoelectric body in the illustrated camera module.

[0025] Figure 11 Schematic diagram of the structure of the electronic device provided by an embodiment of the present application. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0027] An embodiment of the present application provides a camera module. Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic diagram of the structure of the camera module provided by an embodiment of the present application. Figure 2 is Figure 1 the exploded view of the illustrated camera module. The camera module 10 includes a housing assembly 12, a carrier 14, a lens 16, and a driving assembly 18. The housing assembly 12 can serve as the outer shell of the entire camera module 10 to protect the components within the housing assembly 12. The housing assembly 12 has an accommodation space, the carrier 14 is movably installed in the accommodation space of the housing assembly 12, and the lens 16 is installed on the carrier 14. The driving assembly 18 is disposed between the housing assembly 12 and the carrier 14. The driving assembly 18 includes an elastic member 182, a piezoelectric body 184, and a friction plate 186. The friction plate 186 is installed on the side of the housing assembly 12 facing the carrier 14, the piezoelectric body 184 is installed on the side of the carrier 14 facing the housing assembly through the elastic member 182, and the piezoelectric body 184 can move relative to the friction plate 186.

[0028] The friction plate 186 and the housing assembly 12 serve as the stator, the piezoelectric body 184 and the carrier 14 serve as the rotor. The piezoelectric body 184 generates power through vibration friction and can move relative to the friction plate 186 to drive the entire carrier 14 and the lens 16 to move, so as to realize the movement of the lens 16 relative to the housing assembly 12. The driving assembly 18 adopts a piezoelectric mode of driving and does not need to perform electromagnetic mode driving through a magnet and a coil, which can solve the problem that the magnetic field generated by the magnet and the coil interferes with other magnetic components.

[0029] Among them, the distance that the piezoelectric body 184 moves relative to the friction plate 186 each time is very small. For example, the distance moved each time can be several hundred nanometers, such as 500 nanometers, 200 nanometers, or 100 nanometers, etc. Therefore, the driving assembly 18 with the piezoelectric body 184 has high movement accuracy, and thus the driving accuracy of the lens 16 is high.

[0030] It can be understood that the movement accuracy of the electromagnetic mode drive is relatively low, and a closed-loop mode needs to be performed, that is, the movement distance of the lens driven by the electromagnetic mode is fed back in real time, and then the driving mechanism driven by the electromagnetic mode is adjusted to ensure the movement accuracy of the lens. The movement accuracy of the piezoelectric body 184 in this embodiment is much higher than that of the electromagnetic mode drive, and an open-loop mode can be performed, that is, it is not necessary to feed back the movement distance of the lens 16 in real time, and it is not necessary to perform a closed-loop mode like the electromagnetic mode drive, and the cost is low.

[0031] It can be understood that if the friction plate is installed on the carrier, that is, the lens, the carrier, and the friction plate are used as the mover, and the piezoelectric body is installed on the housing assembly through the elastic member, that is, the housing assembly and the piezoelectric body are used as the stator, then during the movement of the lens and the friction plate relative to the piezoelectric body, the lens and the friction plate move together, and the position of the piezoelectric body relative to the lens can always be changing. When the lens moves to the highest position or the lowest position, the piezoelectric body is relative to the bottom or top of the lens and the carrier. The piezoelectric body drives the bottom or top of the lens and the carrier through the friction plate. The carrier and the lens are movably installed in the housing assembly, and the force on the ends of the carrier and the lens will cause uneven overall force, which is likely to cause the deflection of the carrier and the lens, affecting the shooting effect of the camera module.

[0032] In this embodiment, the piezoelectric body 184 is installed on the carrier 14, that is, the lens 16, the carrier 14, and the piezoelectric body 184 are used as the mover, and the friction plate 186 is installed on the housing assembly 12, that is, the housing assembly 12 and the friction plate 186 are used as the stator. During the movement of the lens 16 and the piezoelectric body 184 relative to the friction plate 186, the lens 16 and the piezoelectric body 184 move together, and the piezoelectric body 184 can be arranged relative to the middle position of the lens 16. Even when the lens 16 moves to the highest position or the lowest position, the piezoelectric body 184 still drives the middle position of the carrier 14 and the lens 16. The middle parts of the carrier 14 and the lens 16 are stressed, and the overall force is uniform. The movement of the piezoelectric body 184 relative to the friction plate 186 will not cause the deflection of the carrier 14 and the lens 16, improving the shooting stability of the camera module 10.

[0033] Among them, the driving assembly 18 can drive the carrier 14 to move along the optical axis direction of the lens 16 to achieve the focusing of the lens 16. The friction plate 186 can be arranged along the optical axis direction of the lens 16. After the piezoelectric body 184 is energized, it can deform so that the piezoelectric body 184 moves relative to the friction member along the optical axis direction of the lens 16, thereby realizing the focusing of the lens 16.

[0034] Exemplarily, in the imaging module 10 for telephoto shooting, the lens 16 requires a relatively large stroke. If the friction plate is disposed on the carrier and the piezoelectric body is disposed on the housing assembly, since the carrier is the mover and the housing assembly is the stator, the stroke of the lens is the length of the friction plate along the optical axis direction of the lens, and the maximum stroke does not exceed the height of the carrier along the optical axis direction of the lens. If the friction plate 186 is disposed on the housing assembly 12 and the piezoelectric body 184 is disposed on the carrier 14, since the carrier 14 is the mover and the housing assembly 12 is the stator, the stroke of the lens 16 is also the length of the friction plate 186 along the optical axis direction of the lens 16, and the maximum stroke does not exceed the height of the housing assembly 12 along the optical axis direction of the lens 16. However, the carrier 14 is disposed within the housing assembly 12, and the height of the housing assembly 12 is greater than the height of the carrier 14, so that the moving distance of the carrier 14 can exceed the height of the carrier 14, thereby giving the lens 16 a greater stroke and meeting the telephoto shooting within a larger range.

[0035] Optionally, when designing a telephoto camera (imaging module for telephoto shooting), the stroke required by the lens may be relatively large, such as greater than the height of the carrier where the lens is located. In this case, placing the friction plate on the carrier cannot meet the requirements. Therefore, the friction plate cannot be placed on the carrier (mover), but must be placed on the housing assembly (stator), that is, the piezoelectric body is placed on the carrier as the mover and the friction plate is placed on the housing assembly as the stator.

[0036] Among them, the piezoelectric body 184 is driven by piezoelectricity, and its thrust is greater than that driven by the electromagnetic mode, which can push a heavier lens 16, thereby realizing a larger module.

[0037] It should be noted that in some other embodiments, the driving assembly can also drive the carrier to move along the direction perpendicular to the optical axis of the lens, thereby realizing anti-shake for the lens. Among them, anti-shake can be performed in the first direction and / or the second direction of the lens. The first direction and the second direction are perpendicular to each other and both are perpendicular to the optical axis direction of the lens.

[0038] Among them, the imaging module 10 may further include a connecting wire (not shown in the figure). One end of the connecting wire is connected to the piezoelectric body 184, and the other end of the connecting wire is used to connect to a power source. The connecting wire is bent and disposed between the carrier 14 and the housing assembly 12. The piezoelectric body 184 needs to be powered on, so the piezoelectric body 184 needs to be connected to the power source through the connecting wire. The piezoelectric body 184 and the carrier 14 move relative to the housing assembly 12 as the mover. The connecting wire needs to be able to support the movement of the piezoelectric body 184. The connecting wire can be bent and disposed between the carrier 14 and the housing assembly 12, that is, the connecting wire has a margin between the carrier 14 and the housing assembly 12. During the movement of the carrier 14 and the piezoelectric body 184, the connecting wire can be folded or unfolded.

[0039] Please combine Figure 3 and Figure 4 ,Figure 3 As Figure 1 shown in the schematic structural diagram of another angle of the camera module shown in Figure 4 , Figure 4 and Figure 3 shown in the cross-sectional view of the camera module along the BB direction. The piezoelectric body 184 includes a piezoelectric block 1842 and a piezoelectric head 1844. The piezoelectric block 1842 is connected to the carrier 14 through an elastic member 182. One side of the piezoelectric block 1842 facing away from the elastic member 182 is connected to the piezoelectric head 1844. The piezoelectric head 1844 abuts against the friction plate 186, and the surface of the piezoelectric head 1844 abutting against the friction plate 186 is the friction surface.

[0040] Among them, the piezoelectric head 1844 and the piezoelectric block 1842 can be fixedly connected by bonding, snap-fitting, screwing, etc., or the piezoelectric head 1844 and the piezoelectric block 1842 can also be integrally formed.

[0041] The piezoelectric block 1842 and the elastic piece can be fixedly connected by bonding, snap-fitting, screwing, etc.

[0042] The friction plate 186 and the housing assembly 12 can be fixedly connected by bonding, snap-fitting, screwing, etc., or the friction plate 186 can also be embedded in the housing assembly 12.

[0043] Optionally, one side of the piezoelectric body 184 facing the elastic member 182 includes a central region and a surrounding region surrounding the central region. The elastic member 182 is annular, and the elastic member 182 is connected to the surrounding region.

[0044] The annular elastic member 182 and the surrounding region of the piezoelectric body 184 are correspondingly connected, which is convenient for the deformation of the piezoelectric body 184, and thus convenient for the relative movement of the piezoelectric body 184 with respect to the friction. Exemplarily, the piezoelectric body 184 has a first part and a second part arranged oppositely along the optical axis direction of the lens 16. The first part and the second part are located on both sides of the piezoelectric head 1844. The first part can be twisted in the direction towards the carrier 14, and the second part can be twisted in the direction towards the friction plate 186, that is, one end of the first part away from the second part is away from the carrier 14, and one end of the second part away from the first part is close to the carrier 14. The elastic member 182 is annular, and the opposite ends of the first part and the second part are connected to the opposite two parts of the annular elastic member 182, and there is no interference between them. One end of the first part away from the second part can be conveniently away from the carrier 14 through the elastic member 182, and one end of the second part away from the first part can be conveniently close to the carrier 14 through the elastic member 182.

[0045] The camera module 10 further includes a guiding member 19. The guiding member 19 is disposed between the carrier 14 and the housing assembly 12, and the carrier 14 moves relative to the housing assembly 12 through the guiding member 19.

[0046] It can be understood that the carrier 14 is movably installed in the housing assembly 12. The carrier 14 carries the lens 16, and the lens 16 needs to operate stably in the housing assembly 12 for stable shooting. When the driving component 18 drives the carrier 14 to move relative to the housing assembly 12, the guiding component 19 can also play a role in enabling the carrier 14 to move stably relative to the housing assembly 12 between the carrier 14 and the housing assembly 12.

[0047] Please refer to Figure 5 , Figure 6 and Figure 7 , Figure 5 which is Figure 3 a cross-sectional view of the camera module shown in the CC direction, Figure 6 and Figure 1 is a schematic structural diagram of the camera module from another angle shown in Figure 7 and Figure 6 is a cross-sectional view of the camera module shown in the ZZ direction. Optionally, the guiding component 19 may include balls. Correspondingly, a bearing structure 142 is provided on one side of the carrier 14 facing the housing assembly 12, and a limiting structure 122 corresponding to the bearing structure 142 is provided on the housing assembly 12. The bearing structure 142 and the limiting structure 122 form a receiving groove 144; the balls are arranged in the receiving groove 144, and the carrier 14 can roll relative to the housing assembly 12 through the balls.

[0048] Exemplarily, the guiding component 19 includes two groups of balls, and the two groups of balls are arranged oppositely. The driving component 18 is located on the center line between the two groups of balls. The driving component 18 can drive the carrier 14 to move the carrier 14 relative to the housing assembly 12. The carrier 14 can also roll relative to the housing assembly 12 through the two oppositely arranged groups of balls, reducing the resistance between the carrier 14 and the housing assembly 12. At the same time, the carrier 14 is in rolling connection with the driving component 18 through the two oppositely arranged groups of balls, which can balance the movement and force of the carrier 14. Among them, the carrier 14 can be a rectangular or substantially rectangular structure. Optionally, the carrier 14 can have four corner positions, and the two groups of balls can be located at two opposite corner positions of the carrier 14, and the driving component 18 is arranged at another corner position of the carrier 14. Optionally, the carrier 14 may include a first side, a second side, a third side, and a fourth side connected in sequence. The first side and the third side are arranged oppositely, the second side and the fourth side are arranged oppositely, the first side is connected to the housing assembly 12 through the driving component 18, and the third side and the fourth side are both in rolling connection with the housing assembly 12 through a group of balls. The number of each group of balls can be set as needed. For example, the number of each group of balls can be 1, 2, 3, or more.

[0049] In another example, the ball and the driving component are arranged oppositely, that is, the ball and the driving component are arranged on opposite sides of the carrier. When the driving component drives the carrier to move relative to the housing component, the other side of the carrier rolls through the ball and the housing component, reducing the resistance between the carrier and the housing component. At the same time, the ball and the driving component are located on opposite sides of the carrier, which can balance the movement and force of the carrier. Wherein, the carrier can be a rectangular or substantially rectangular structure. Optionally, the carrier can have four corner positions, and the ball and the driving component are arranged at two opposite corner positions of the carrier. Optionally, the carrier includes a first side and a third side arranged oppositely, the first side is connected to the housing component through the driving component, and the third side is connected to the housing component through the ball in a rolling manner.

[0050] Please refer to Figure 8 and Figure 9 , Figure 8 which is Figure 3 a schematic structural diagram of the carrier and the guide in the camera module shown. Figure 9 And Figure 3 is a schematic structural diagram of the housing component in the camera module shown. Wherein, the bearing structure 142 includes a limiting plate 1422 and a first side wall 1424, and the limiting structure 122 includes a second side wall 1222 arranged opposite to the first side wall 1424. The first side wall 1424 and the second side wall 1222 are arranged at intervals, and the first side wall 1424 and the second side wall 1222 are arranged around the limiting plate 1422 to form a receiving groove 144.

[0051] When the carrier 14 moves relative to the housing component 12, the first side wall 1424 and the second side wall 1222 are arranged at intervals and do not contact each other, so as not to hinder the movement of the carrier 14 and the housing component 12. The limiting plate 1422 can be used to carry the ball, and the first side wall 1424 and the second side wall 1222 arranged at intervals can be used to limit the ball, so that the ball is within the receiving groove 144 formed by the limiting plate 1422, the first side wall 1424 and the second side wall 1222.

[0052] It should be noted that the number of balls in the receiving groove 144 can be set as needed. For example, 1 ball, 2 balls, 3 balls or more balls can be set in one receiving groove 144. When 2 or more balls are set in one receiving groove 144, the 2 or more balls can be arranged in sequence along the optical axis direction of the lens 16. Any two adjacent balls can be in direct contact. Since the balls are spherical, the direct contact between two adjacent balls will not affect the movement of the balls. Of course, in some other embodiments, the bearing structure 142 can be provided with a plurality of independent chambers, and one ball is arranged in each chamber. For example, one or more support plates extend from the first side wall 1424 towards the second side wall 1222. The limiting plate 1422, the first side wall 1424, the second side wall 1222 and one or more support plates can form a plurality of independent chambers, and one ball is placed in each chamber.

[0053] Optionally, the guiding member can include a slider and a slide rail. The slide rail can be arranged on the housing assembly, and the slider can be arranged on the carrier. The slider is movably installed on the slide rail and can slide along the slide rail. In some other embodiments, the slide rail can be arranged on the carrier, and the slider can be arranged on the housing assembly. The slider is movably installed on the slide rail and can slide along the slide rail.

[0054] Exemplarily, the guiding member includes two sets of sliders and slide rails. Each set of sliders and slide rails forms a sliding mechanism. The two sliding mechanisms are arranged oppositely, and the driving component is located on the center line of the two sets of sliders and slide rails. The driving component can drive the carrier to move relative to the housing assembly, and the carrier can also slide relative to the housing assembly through the two sliding mechanisms, reducing the resistance between the carrier and the housing assembly. At the same time, the carrier slides relative to the housing assembly through the two oppositely arranged sliding mechanisms, which can balance the movement and force of the carrier. Among them, the carrier can be a rectangular or substantially rectangular structure. Optionally, the carrier can have four corner positions. The two sliding mechanisms can be located at two opposite corner positions of the carrier, and the driving component is arranged at another corner position of the carrier. Optionally, the carrier can include a first side, a second side, a third side and a fourth side connected in sequence. The first side and the third side are arranged oppositely, the second side and the fourth side are arranged oppositely. The first side is connected to the housing assembly through the driving component, and the third side and the fourth side are both slidably connected through a set of sliders and slide rails.

[0055] In another example, the sliding mechanism composed of the slider and the slide rail is disposed opposite to the driving component, that is, the sliding mechanism and the driving component are arranged on opposite sides of the carrier. When the driving component drives the carrier to move relative to the housing component, the other side of the carrier slides through the sliding mechanism, reducing the resistance between the carrier and the housing component. At the same time, the sliding mechanism and the driving component are located on opposite sides of the carrier, which can balance the movement and force of the carrier. Wherein, the carrier can be a rectangular or substantially rectangular structure. Optionally, the carrier can have four corner positions, and the sliding mechanism and the driving component are arranged at two opposite corner positions of the carrier. Optionally, the carrier includes a first side and a third side arranged opposite to each other. The first side is connected to the housing component through the driving component, and the third side is slidably connected to the housing component through the sliding mechanism.

[0056] Wherein, the slide rail can be a groove structure, and a part of the slider is disposed in the groove structure and slides along the extension direction of the groove. The slide rail can also be a slide bar, and the slider is sleeved on the slide bar and slides along the extension direction of the slide bar (i.e., the axis of the slide bar).

[0057] For a better understanding of the camera module of this embodiment, please continue to refer to Figure 2 , the camera module may further include a filter 132, a bracket 134, an optoelectronic chip 152 and a substrate 154. The optoelectronic chip 152 is disposed on the substrate 154. The optoelectronic chip 152 can perform optoelectronic conversion. The bracket 134 is disposed on the substrate 154. The bracket 134 is provided with a light-transmitting hole. The filter 132 is installed in the light-transmitting hole. The filter 132 faces the optoelectronic chip 152 and faces the light inlet of the lens 16. Specifically, the lens 16 collects the light signal of the external environment, then passes through the filter 132 to filter out some unnecessary stray light (such as red light and / or purple light), and then reaches the optoelectronic chip 152. The optoelectronic chip 152 performs optoelectronic conversion to generate a corresponding electrical signal, and then is connected to the image processing chip through the BTB socket installed on the substrate 154, so that the image processing chip processes to obtain an image.

[0058] To better understand the drive component of the present application, the drive component will be described by way of example below. The piezoelectric body in this embodiment includes a piezoelectric block and a piezoelectric head. The piezoelectric block can be prepared from piezoelectric ceramics or piezoelectric single crystals, or can also be a multilayer ceramic. For example, the piezoelectric block can be selected from lead zirconate titanate (PZT)-based piezoelectric ceramics, potassium sodium niobate (KNN)-based piezoelectric ceramics, barium titanate (BT)-based piezoelectric ceramics, lead magnesium niobate-lead indium niobate (PMN-PT)-based piezoelectric single crystals, textured ceramics, etc. The surface of the piezoelectric block is plated with electrodes, which can be divided into several electrodes according to requirements for applying control signals. The shape of the piezoelectric head can be cylindrical, spherical, triangular pyramidal or some other irregular shapes, and its material can be selected from wear-resistant materials such as alumina (Al2O3), silicon dioxide (SiO2), zirconia (ZrO2), carbon fiber, polyester fiber, etc., which can not only ensure that the driving force of the piezoelectric body is well transmitted to the mover, but also prevent wear during long-term operation and maintain the fitting accuracy.

[0059] The fixing structure of the piezoelectric body is mainly a spring piece, which can be adhesively fixed to the mover (such as the carrier for mounting the lens in the above embodiment), and is adhesively fixed in a frame shape. The purpose is to ensure firm adhesion while giving the piezoelectric body enough space for movement to ensure that the piezoelectric body can normally excite the coupling mode. When the spring piece fixes the mover, there is an elastic force on the mover, and the elastic force is to ensure that the piezoelectric head on the piezoelectric body and the stator (such as the housing assembly in the above embodiment) are always in contact and do not separate (or separate briefly).

[0060] A friction plate is provided on the side of the stator facing the mover. The friction plate is made of a wear-resistant material, and the material of the friction plate can be the same as or different from that of the piezoelectric head. The friction plate forms a surface, line or point contact with the piezoelectric head in the piezoelectric body, and drives the lens to perform up and down focusing movement under the drive of the piezoelectric body to complete the front focusing function.

[0061] The working principle of the piezoelectric body is as follows: The piezoelectric body utilizes the inverse piezoelectric effect of the piezoelectric material. After being applied with an alternating current signal of a certain frequency, the piezoelectric body simultaneously excites multiple modes, and relies on multimode coupling to generate micro-amplitude vibration and driving force. Through the cooperation of the spring piece fixing structure between the piezoelectric head and the friction plate, the micro-amplitude vibration of the piezoelectric body is converted into the macroscopic linear motion of the mover (mechanical guide structure).

[0062] Such as Figure 10As shown, the modal coupling of the piezoelectric head includes the L1B2 working mode in which the first-order elongation (L1) vibration mode and the second-order bending vibration mode (B2) are coupled. For example, the piezoelectric body uses a lead indium niobate-lead magnesium niobate-lead titanate relaxor ferroelectric single crystal (PIN-PMN-PT single crystal) material. At the resonant frequency, through the coupling of the L1-B2 mode, displacement components in the X direction and the Y direction are simultaneously generated on the piezoelectric head. Due to the phase difference of the voltages on the two sets of drive electrodes, the combined displacement is an inclined ellipse that moves upward or downward. Then, through the frictional action between the piezoelectric head and the friction plate, the mover is pushed to generate a macroscopic displacement.

[0063] An embodiment of the present application also provides an electronic device. Please refer to Figure 11 , Figure 11 which is a schematic structural diagram of the electronic device provided by the embodiment of the present application. The electronic device 1 includes a housing 20 and a camera module 10, and the camera module 10 is installed in the housing 20. The camera module 10 can be the camera module in any of the above embodiments, and the structure of the camera module will not be described in detail.

[0064] It should be noted that the camera module 10 can be used as the rear camera of the electronic device 1 or the front camera of the electronic device 1.

[0065] The electronic device 1 can include multiple cameras. The multiple cameras can include at least two of a main camera, a telephoto camera, a macro camera, a black and white camera, a bokeh camera, a 3D camera, etc. The multiple cameras can partially or entirely adopt the structure of the camera module in the above embodiments.

[0066] It can be understood that the electronic device provided by the embodiment of the present application can be a mobile terminal device such as a mobile phone or a tablet computer, and can also be a device with a camera module such as a game device, an augmented reality (AR) device, a virtual reality (VR) device, an in-vehicle computer, a laptop computer, a data storage device, an audio playback device, a video playback device, a wearable device, a monitoring device, etc. The wearable device can be a smart watch, smart glasses, etc.

[0067] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0068] The above has introduced in detail the camera module and the electronic device provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An imaging module, characterized in that, Comprising: A housing assembly having an accommodation space; A carrier, at least partially movably mounted within the accommodation space; A lens mounted on the carrier; And A driving assembly disposed between the housing assembly and the carrier. The driving assembly includes an elastic member, a piezoelectric body, and a friction plate arranged in sequence along a direction perpendicular to the optical axis of the lens. The friction plate is mounted on a side of the housing assembly facing the carrier. The piezoelectric body is mounted on a side of the carrier facing the housing assembly through the elastic member. The piezoelectric body abuts against the friction plate and is capable of moving relative to the friction plate; Wherein, a surface of the piezoelectric body facing the elastic member includes a central region and a surrounding region surrounding the central region. The elastic member is annular and is connected to the surrounding region. The piezoelectric body includes a piezoelectric head and a piezoelectric block connected to each other. The piezoelectric block abuts against the friction plate. The piezoelectric block is connected to the carrier through the elastic member. The piezoelectric block includes a first portion and a second portion that are oppositely arranged along the optical axis of the lens and are located on both sides of the piezoelectric head. When an alternating current signal is applied to the piezoelectric body, one end of the first portion away from the second portion moves away from the carrier through the elastic member, and one end of the second portion away from the first portion approaches the carrier through the elastic member, and the piezoelectric head generates a first-order elongation vibration mode and a second-order bending vibration mode.

2. The camera module according to claim 1, wherein The driving assembly is capable of driving the carrier to move along the optical axis of the lens to achieve focusing of the lens.

3. The imaging module according to claim 2, wherein, The imaging module further includes a connecting wire. One end of the connecting wire is connected to the piezoelectric body, and the other end of the connecting wire is used to connect to a power source. The connecting wire is bent and disposed between the carrier and the housing assembly.

4. The camera module according to any one of claims 1-3, characterized in that, The imaging module further includes: A guiding member disposed between the carrier and the housing assembly. The carrier moves relative to the housing assembly through the guiding member.

5. The camera module according to claim 4, wherein A bearing structure is provided on a side of the carrier facing the housing assembly. The housing assembly is correspondingly provided with a limiting structure for the bearing structure. The bearing structure and the limiting structure form a receiving groove; The guiding member includes balls, and the balls are disposed within the receiving groove.

6. The camera module according to claim 5, wherein, The bearing structure includes a limiting plate and a first side wall. The limiting structure includes a second side wall oppositely arranged with the first side wall. The first side wall and the second side wall are spaced apart. The first side wall and the second side wall surround the limiting plate to form the receiving groove.

7. The imaging module according to claim 4, wherein The guiding member includes a slider and a slide rail; The slide rail is disposed on the housing assembly, the slider is disposed on the carrier, and the slider is movably mounted on the slide rail and is capable of sliding along the slide rail; Or The slide rail is disposed on the carrier, the slider is disposed on the housing assembly, and the slider is movably mounted on the slide rail and is capable of sliding along the slide rail.

8. An electronic device, characterized in that, Comprising: A housing; And An imaging module mounted within the housing, and the imaging module includes the imaging module according to any one of claims 1 to 7.

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