Piezoelectric motor and camera module

Abstract

The invention discloses a piezoelectric motor and a camera module, and belongs to the technical field of camera modules. The piezoelectric motor comprises a fixed frame, a movable carrier, a driving assembly and a supporting assembly, the movable carrier is movably arranged on the fixed frame, the driving assembly is connected with the fixed frame and abuts against the movable carrier at the same time, and the supporting assembly is arranged between the fixed frame and the movable carrier. The supporting assembly is matched with the driving assembly to enable the movable carrier to be supported on the fixed frame, and the driving assembly and the supporting assembly are arranged on the same side of the piezoelectric motor. The camera module comprises the piezoelectric motor, a lens assembly arranged in the piezoelectric motor, and a photosensitive assembly arranged opposite to the lens assembly. The method has the advantages that the risk that the movable carrier inclines relative to the fixed frame is reduced, the supporting assembly is prevented from being stuck, and the photographing effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of camera modules, and in particular to piezoelectric motors and camera modules. Background Art

[0002] As users' demand for anti-shake shooting increases, users pay more and more attention to the performance of camera anti-shake in image shooting. Users expect camera modules with high pixels, small size and anti-shake capabilities. But generally speaking, the number of camera module pixels increases with the increase of image surface, and the total height of the optical element mechanism will also increase with the increase of image surface. The size of optical elements or photosensitive devices will also increase, and the travel and driving force requirements of the corresponding motors will also increase accordingly. The increase in motor size leads to an increase in the size of the camera module.

[0003] A piezoelectric motor is a motor with fast response, strong driving force and high driving precision. The use of a piezoelectric motor can significantly improve the performance of a camera module. This application provides a new piezoelectric motor solution to improve the photo-taking effect. Summary of the invention

[0004] One object of the present application is to provide a piezoelectric motor that reduces the risk of a movable carrier tilting relative to a fixed frame and avoids jamming of a supporting assembly.

[0005] Another object of the present application is to provide a camera module to achieve smooth adjustment of a movable carrier equipped with an optical lens and improve photographic effects.

[0006] In order to achieve one of the purposes of this application, the technical solution adopted in this application is: a piezoelectric motor applied to a camera module, which includes:

[0007] Fixed frame;

[0008] A movable carrier, the movable carrier being movably arranged on the fixed frame;

[0009] A driving assembly, the driving assembly is connected to the fixed frame and abuts against the movable carrier;

[0010] A support assembly, wherein the support assembly is disposed between the fixed frame and the movable carrier, and the support assembly cooperates with the driving assembly so that the movable carrier is supported on the fixed frame; and the driving assembly and the support assembly are disposed on the same side of the piezoelectric motor.

[0011] Preferably, the supporting assembly is a guide rod, and the movable carrier is provided with at least two protrusions suitable for contacting the guide rod, and the at least two protrusions are spaced apart in a direction parallel to the length direction of the guide rod.

[0012] As a preference, the movable carrier is provided with two protrusions, and the two protrusions are located at two ends of the movable carrier, and the middle portion of the movable carrier is relatively recessed to be separated from the middle portion of the supporting assembly.

[0013] Preferably, the support assembly comprises a first support member and a second support member, and the first support member and the second support member are respectively located on two sides of the driving assembly.

[0014] Preferably, the first support member and the second support member are symmetrically arranged on both sides of the driving assembly.

[0015] As a preferred embodiment, the fixed frame has a first frame side, the movable carrier has a first carrier side, the first frame side is arranged opposite to the first carrier side, the driving assembly is arranged between the first frame side and the first frame side, the fixed frame is provided with a first inner convex portion and a second inner convex portion protruding toward the movable carrier, and both ends of the first carrier side are provided with a first outer convex portion and a second outer convex portion protruding toward the fixed frame, the first outer convex portion is located between the first frame side and the first inner convex portion, the second outer convex portion is located between the first frame side and the second inner convex portion, the first support member is located between the first outer convex portion and the first inner convex portion, and the second support member is located between the second outer convex portion and the second inner convex portion.

[0016] Preferably, a first guide groove is provided on the first inner convex portion, and a second guide groove is provided on the first outer convex portion. The first guide groove and the second guide groove are arranged opposite to each other and cooperate to form a first channel extending along a first direction. The first support member is arranged in the first channel to guide the movement direction of the movable carrier. A first support portion is provided on the second inner convex portion, and a second support portion is provided on the second outer convex portion. The first support portion and the second support portion are arranged opposite to each other and cooperate to form a second channel extending along the first direction. The second support member is arranged in the second channel.

[0017] Preferably, at least one of the first supporting portion and the second supporting portion is provided with a supporting plane suitable for contacting the second supporting member, and the second supporting member is suitable for adjusting its position perpendicular to the first direction along the supporting plane.

[0018] Preferably, the first support member is disposed in the first channel and is suitable for moving along a first direction, and the second support member is disposed in the second channel and is suitable for moving at least along the first direction.

[0019] Preferably, the driving assembly includes a pre-stressing assembly and an actuating assembly, wherein the pre-stressing assembly is connected to the fixed frame, and the actuating assembly is connected to the pre-stressing assembly, and the pre-stressing assembly provides pre-stress to the actuating assembly so that the driving end of the actuating assembly abuts against the movable carrier and applies the pre-stress to the movable carrier, so that the actuating assembly is suitable for driving the movable carrier to move relative to the fixed frame when receiving a driving signal.

[0020] Preferably, the pre-stressing assembly comprises a structural member and a buffer member, wherein the structural member is connected to the fixed frame, and the buffer member is disposed between the structural member and the actuating assembly and is adapted to be deformed by being squeezed by the structural member and the actuating assembly.

[0021] In order to achieve another purpose of the present application, the technical solution adopted in the present application is: a camera module, which includes:

[0022] The piezoelectric motor mentioned above;

[0023] a lens assembly disposed in the piezoelectric motor; and

[0024] The photosensitive component is arranged relative to the lens component.

[0025] Compared with the prior art, the beneficial effects of this application are:

[0026] (1) The support assembly and the drive assembly are arranged on the same side of the piezoelectric motor, so that the distance from the support assembly to the drive assembly is designed to be shorter. In this way, the driving force of the drive assembly has a smaller torque on the movable carrier. In the case where the driving force may tilt relative to the movable carrier, the present application reduces the risk of the movable carrier tilting by reducing the torque, and the position of the movable carrier and the lens assembly thereon can be adjusted as expected.

[0027] (2) The tilt of the movable carrier may further cause the support assembly to get stuck, thereby causing the movable carrier to be unable to move relative to the fixed frame and unable to achieve the focusing function. The present application reduces the risk of the movable carrier tilting and the probability of the support assembly getting stuck, so that the position of the movable carrier can be smoothly adjusted and the piezoelectric motor can reliably achieve the focusing function, thereby improving the photographing effect.

[0028] (3) The setting of the support assembly can reduce the friction contact area between the movable carrier and the fixed frame, which is beneficial to reducing the friction force received by the movable carrier when it moves relative to the fixed frame, and the movable carrier is easy to be driven by the driving assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a piezoelectric motor in the prior art;

[0030] Figure 2 A schematic diagram of the tilting of the movable carrier;

[0031] Figure 3 A top view of a piezoelectric motor in a preferred embodiment of the present application;

[0032] Figure 4 This is a schematic diagram of the exploded structure of a piezoelectric motor in a preferred embodiment of the present application;

[0033] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure in the AA direction;

[0034] Figure 6 It is a schematic diagram of the three-dimensional structure of the movable carrier;

[0035] Figure 7 It is a schematic diagram of the local structure of the piezoelectric motor at the first support member;

[0036] Figure 8 It is a schematic diagram of the local structure of the piezoelectric motor at the second support member;

[0037] Fig. 9 for Figure 3 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0038] Fig.10 It is a schematic diagram of the exploded structure of the drive assembly;

[0039] Fig.11 Schematic diagram of the working principle of the piezoelectric vibrator;

[0040] Fig.12 This is a schematic diagram of the installation of structural parts;

[0041] In the figure: 10, fixed frame; 11, first frame side; 111, opening; 12, first inner convex portion; 121, first guide groove; 13, second inner convex portion; 131, first support portion; 14, second frame side; 15, third frame side; 20, movable carrier; 201, protrusion; 202, support plane; 203, limiting surface; 21, first carrier side; 22, first outer convex portion; 221, second guide groove; 23, second outer convex portion; 231, second support portion; 2a, first passage; 2b, second passage Road; 24, second carrier side; 25, third carrier side; 26, wear-resistant part; 30, support assembly; 31, first support member; 32, second support member; 40, drive assembly; 41, pre-load assembly; 410, spring; 411, structural member; 412, buffer member; 42, actuator assembly; 421, flexible circuit board; 422, piezoelectric vibrator; 4221, first side electrode; 4222, second side electrode; 4223, third side electrode; 4224, fourth side electrode; 423, friction head; 61, adhesive. DETAILED DESCRIPTION

[0042] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0043] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0044] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0045] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0046] like Figure 1 , Figure 2 As shown, in the prior art, the piezoelectric motor includes a fixed frame 10, a movable carrier 20 movably arranged in the fixed frame 10, and a support assembly 30 and a driving assembly 40 arranged between the movable carrier 20 and the fixed frame 10. The driving end of the driving assembly 40 abuts against the movable carrier 20 and provides a pre-pressure P to the movable carrier 20. The supporting assembly 30 is arranged between the fixed frame 10 and the movable carrier 20, and provides a supporting force N to the movable carrier 20. The supporting force N cooperates with the pre-pressure P, so that the movable carrier 20 can be movably supported on the fixed frame 10. Furthermore, when the driving assembly 40 receives a driving signal, the movable carrier 20 can be driven to move in a specific direction through the friction between the driving end and the movable carrier 20.

[0047] Specifically, the driving assembly 40 includes a pre-stressing assembly 41 and an actuating assembly 42. The pre-stressing assembly 41 is connected to the fixed frame 10, and the actuating assembly 42 is connected to the pre-stressing assembly 41. The pre-stressing assembly 41 provides a pre-stressing force P toward the movable carrier 20 to the actuating assembly 42, so that the driving end of the brake assembly abuts against one side of the movable carrier 20 and applies the pre-stressing force P to the movable carrier 20.

[0048] More specifically, the actuating assembly 42 includes a piezoelectric vibrator 422 and a friction head 423. The piezoelectric vibrator 422 is connected to the pre-pressing assembly 41. The friction head 423 is fixed on the side of the piezoelectric vibrator 422 facing the movable carrier 20. The friction head 423 abuts against the side wall of the movable carrier 20 as the driving end of the driving assembly 40. The piezoelectric vibrator 422 is a substrate that has an inverse piezoelectric effect and shrinks or expands according to the polarization direction and the electric field direction. It can be used by polarizing the substrate in the thickness direction of single crystal, polycrystalline ceramics, polymers, etc. The inverse piezoelectric effect refers to the application of an electric field in the polarization direction of the dielectric, and the dielectric undergoes mechanical deformation when a potential difference is generated. The piezoelectric vibrator 422 has the effect of ultrasonic oscillation, and can realize a swaying reciprocating motion or an elliptical motion on a specifically set electrode layer, thereby being able to drive the friction head 423 to perform a swaying reciprocating motion or an elliptical motion, thereby realizing the driving of the movable carrier 20.

[0049] It should be pointed out that: the piezoelectric vibrator 422 causes the friction head 423 to move by deformation, and when the piezoelectric vibrator 422 is deformed, the angle between the friction head 423 and the abutting surface of the movable carrier 20 changes accordingly, resulting in the pre-pressure P not always acting perpendicularly on the side wall of the movable carrier 20, but the direction of the pre-pressure P has a certain inclination relative to the plane where the side wall of the movable carrier 20 is located. At the same time, when the hardness of the pre-pressure component 41 is relatively small, for example, when the pre-pressure component 41 is a spring 410, the pre-pressure component 41 may bend to a certain extent due to the deformation of the piezoelectric vibrator 422, resulting in the direction of the pre-pressure P relative to the angle of the abutting surface. That is to say, under certain circumstances, the direction of the pre-pressure P is inclined relative to the plane where the side wall of the movable carrier 20 is located. In this case, when the actuating component 42 drives the movable carrier 20 to move, it is easy to cause the movable carrier 20 to tilt.

[0050] In some existing embodiments, the pre-stressing component 41 is configured as a spring sheet 410, the spring sheet 410 is located on the side of the piezoelectric vibrator 422 facing away from the movable carrier 20, the end of the spring sheet 410 is fixedly connected to the fixed frame 10, the middle part of the spring sheet 410 abuts against the outer side of the piezoelectric vibrator 422, and the pre-stressing force P is provided by the elastic force of the spring sheet 410. Since the spring sheet 410 has a small rigidity and is easy to deform, the spring sheet 410 will bend after providing the pre-stressing force P, and an inclination angle will be generated in the middle part of the spring sheet 410, which will cause the piezoelectric vibrator 422 to have an inclination angle other than the preset angle relative to the movable carrier 20. For example, in an ideal case, the spring sheet 410 is arranged parallel to the piezoelectric vibrator 422 to provide a pre-stressing force P perpendicular to the abutting surface of the movable carrier 20, but in actual use, the spring sheet 410 bends so that the piezoelectric vibrator 422 is tilted relative to the movable carrier 20, and the pre-stressing force P acts on the movable carrier 20 in an inclined manner, causing the movable carrier 20 to tilt.

[0051] In particular, in some existing embodiments, the support assembly 30 is arranged at two diagonal positions of the movable carrier 20. From a top view, the support assembly 30 arranged at the two diagonal positions of the movable carrier 20 and the actuating assembly 42 are arranged at three points on the side wall of the movable carrier 20. The distance from the center position where the actuating assembly 42 and the movable carrier 20 are in friction contact to the connecting line of the support assembly 30 arranged at the two diagonal positions is the lever arm x. The magnitude of the overturning moment M of the movable carrier 20 at the diagonal position is positively correlated with the magnitude of the lever arm x. The three-point arrangement makes the lever arm x and the overturning moment M larger. When the movable carrier 20 is driven by the actuating assembly 42, the movable carrier 20 will have a larger inclination angle, causing the movable carrier 20 to tilt. Once the movable carrier 20 tilts to a certain extent, the support assembly 30 will be stuck between the movable carrier 20 and the fixed frame 10, causing the movable carrier 20 to be unable to move to achieve the optical focusing function. The existing arrangement of the support assembly 30 will affect the speed and effect of optical focusing.

[0052] In order to solve this problem, the present application improves the setting position of the support assembly 30: the present application provides a piezoelectric motor, which is applied to a camera module, such as Figure 3-Figure 12 As shown, it includes a fixed frame 10, a movable carrier 20, a driving assembly 40, and a supporting assembly 30. The movable carrier 20 is movably arranged on the fixed frame 10. The driving assembly 40 is connected to the fixed frame 10 and abuts against the movable carrier 20. The supporting assembly 30 is arranged between the fixed frame 10 and the movable carrier 20. The supporting assembly 30 cooperates with the driving assembly 40 so that the movable carrier 20 is supported on the fixed frame 10, and the driving assembly 40 and the supporting assembly 30 are arranged on the same side of the piezoelectric motor.

[0053] Compared with the prior art in which two support assemblies 30 and the friction head 423 of the actuating assembly 42 are arranged at three points on the side wall of the movable carrier 20, the arrangement of the support assembly 30 and the driving assembly 40 on the same side of the piezoelectric motor reduces the distance from the friction head 423 of the actuating assembly 42 to the connecting line between the two support assemblies 30, that is, x becomes smaller, thereby reducing the torque M. When the movable carrier 20 is driven to move by the actuating assembly 42, the inclination angle of the movable carrier 20 is small, and the risk of the movable carrier 20 tilting and the support assembly 30 getting stuck is reduced, thereby avoiding affecting the optical focusing effect. In addition, the support component 30 is arranged between the fixed frame 10 and the movable carrier 20, so that there is a fixed gap between the opposite surfaces of the fixed frame 10 and the movable carrier 20. The support component 30 can change the contact mode between the fixed frame 10 and the movable carrier 20, such as point contact and line contact. Compared with the friction generated by direct surface contact between the fixed frame 10 and the movable carrier 20, the friction contact area is reduced, thereby reducing the friction force received by the movable carrier 20 when it moves relative to the fixed frame 10, and the movable carrier 20 is easier to drive.

[0054] In some optional embodiments, the movable carrier 20 is disposed in the fixed frame 10, and a lens assembly is provided on the movable carrier 20, the lens assembly has an optical axis, and the driving assembly 40 can drive the movable carrier 20 to move along the optical axis relative to the fixed frame 10, thereby realizing the optical focusing function.

[0055] In some optional embodiments, the driving assembly 40 includes a pre-stressing assembly 41 and an actuating assembly 42. The pre-stressing assembly 41 is connected to the fixed frame 10, and the actuating assembly 42 is connected to the pre-stressing assembly 41. The pre-stressing assembly 41 provides a pre-stress P to the actuating assembly 42, so that the driving end of the actuating assembly 42 abuts against the movable carrier 20 and applies the pre-stress P to the movable carrier 20, so that the actuating assembly 42 is suitable for driving the movable carrier 20 to move relative to the fixed frame 10 when receiving a driving signal.

[0056] Furthermore, the actuating assembly 42 includes a piezoelectric vibrator 422 and a friction head 423. The piezoelectric vibrator 422 is connected to the pre-pressing assembly 41. The friction head 423 is fixed to the side of the piezoelectric vibrator 422 facing the movable carrier 20. The friction head 423 abuts against the side wall of the movable carrier 20 as the driving end of the driving assembly 40. The high-frequency micro-amplitude vibration of the piezoelectric vibrator 422 causes the friction head 423 to move, and the friction between the friction head 423 and the outer wall of the movable carrier 20 drives the movable carrier 20 to move linearly in the direction parallel to the optical axis.

[0057] In some optional embodiments, the actuator assembly 42 further includes a piezoelectric circuit board, which is specifically a flexible circuit board 421, referred to as FPC, and the piezoelectric circuit board is connected to the piezoelectric vibrator 422 to provide power and drive signals for the piezoelectric vibrator 422. Specifically, the piezoelectric circuit board can be arranged on a side of the piezoelectric vibrator 422 that faces away from the movable carrier 20.

[0058] In some optional embodiments, the pre-pressing component 41 is disposed on a side of the piezoelectric vibrator 422 facing away from the movable carrier 20, so as to provide a pre-pressing force P for pressing the movable carrier 20 to the friction head 423 disposed on a side of the piezoelectric vibrator 422 facing the movable carrier 20. Further, when the actuating component 42 includes a piezoelectric circuit board, the piezoelectric circuit board can be disposed between the piezoelectric vibrator 422 and the pre-pressing component 41.

[0059] In some optional embodiments, the support component 30 is specifically implemented as a ball. Under the action of the pre-pressing component 41, multiple balls are clamped between the fixed frame 10 and the movable carrier 20. There is point contact between the balls and the movable carrier 20. The multiple balls form a supporting surface to provide a supporting force N for the movable carrier 20, so that the movable carrier 20 is supported parallelly and stably on the fixed frame 10.

[0060] Reference Figure 4 As shown, in another optional embodiment, considering that when the movable carrier 20 has a certain inclination angle relative to the fixed frame 10, the ball has the risk of getting stuck, and when sliding friction occurs between the ball and the fixed frame 10 and the movable carrier 20, the ball may be in a rolling state or a sliding state, and the motion state of the ball is uncertain. The ball can switch the motion state at will, which increases the risk of getting stuck. In addition, the ball may also fall off, rub or collide with the movable carrier 20 and the fixed frame 10 to produce debris, and the debris causes the ball to get stuck. When the support component 30 is set as a ball, there is a defect of uncertain friction and easy jamming, which will affect the focusing effect. For this reason, in some embodiments, the support component 30 is specifically implemented as a guide rod. There are at least two guide rods, and the two guide rods together form a support surface to support the movable carrier 20 on the fixed frame 10. There is a line contact between the guide rod and the fixed frame 10 and the movable carrier 20, which reduces the risk of getting stuck compared to the ball.

[0061] Reference Figure 5 , Figure 6As shown, in some optional embodiments, the support assembly 30 is a guide rod, and at least two protrusions 201 suitable for contacting the guide rod are provided on the movable carrier 20, and the at least two protrusions 201 are arranged at intervals in a direction parallel to the length direction of the guide rod. It can be understood that the movable carrier 20 contacts the guide rod through the protrusions 201, and a relative depression is formed between two adjacent protrusions 201, and the depression does not contact the guide rod, which can reduce the friction contact area between the movable carrier 20 and the guide rod, and reduce the friction resistance of the movable carrier 20 when moving, and the protrusions 201 are arranged at intervals in the length direction of the guide rod, so as to support the guide rod at at least two points or two areas in the length direction of the guide rod, so that the guide rod can be stably supported.

[0062] In some optional embodiments, the protrusion heights of the protrusions 201 are consistent to keep the length direction of the guide rod parallel to the optical axis.

[0063] In some optional embodiments, the movable carrier 20 is provided with two protrusions 201, and the two protrusions 201 are located at both ends of the movable carrier 20, and the middle part of the movable carrier 20 is relatively recessed to be separated from the middle part of the support assembly 30. The purpose of reducing the friction contact area and stably supporting the guide rod is achieved with a minimum number of protrusions 201, and the structure is relatively simple and easy to process.

[0064] It can be understood that the present application does not limit the support component 30 to be specifically a ball, guide rod or other structure, as long as it can provide a support surface to support the movable carrier 20 and reduce the friction resistance when the movable carrier 20 moves. For example, the support component 30 can also be implemented as a slider fixed on the movable carrier 20 or the fixed frame 10.

[0065] In some optional embodiments, the support assembly 30 includes a first support member 31 and a second support member 32, and the first support member 31 and the second support member 32 are respectively located on both sides of the driving assembly 40. The two support assemblies 30 provide a supporting force N for the movable carrier 20 from both sides of the driving assembly 40, so that the movable carrier 20 can be stably supported in the fixed frame 10.

[0066] Furthermore, the first support member 31 and the second support member 32 are symmetrically arranged on both sides of the driving assembly 40 to provide equal supporting forces N to both sides of the movable carrier 20, thereby preventing the movable carrier 20 from tilting due to rotation around the optical axis.

[0067] Specifically, the fixed frame 10 has a first frame side portion 11 , the movable carrier 20 has a first carrier side portion 21 , the first frame side portion 11 is arranged opposite to the first carrier side portion 21 , and the driving assembly 40 is arranged between the first frame side portions 11 and the first frame side portions 11 .

[0068] Furthermore, the first frame side portion 11 is provided with an opening 111 that passes through both the inner and outer sides thereof, the pre-pressing assembly 41 is connected to the outer surface of the first frame side portion 11, and the actuating assembly 42 is connected to the pre-pressing assembly 41 and abuts against the outer surface of the first carrier side portion 21 through the opening 111. The driving assembly 40 is partially accommodated in the opening 111, which reduces the extra space required for the driving assembly 40 and reduces the size of the piezoelectric motor.

[0069] The fixed frame 10 is provided with a first inner convex portion 12 and a second inner convex portion 13 protruding toward the movable carrier 20, and the first carrier side portion 21 is provided with a first outer convex portion 22 and a second outer convex portion 23 protruding toward the fixed frame 10 at both ends. The first outer convex portion 22 is located between the first frame side portion 11 and the first inner convex portion 12, the second outer convex portion 23 is located between the first frame side portion 11 and the second inner convex portion 13, the first support member 31 is located between the first outer convex portion 22 and the first inner convex portion 12, and the second support member 32 is located between the second outer convex portion 23 and the second inner convex portion 13. The structural arrangement of the inner convex portion and the outer convex portion enables the support assembly 30 to be arranged on the same side of the piezoelectric motor together with the driving assembly 40, and the support assembly 30 is clamped between the inner convex portion and the outer convex portion, so that by reducing the value of x, the value of the overturning moment M acting on the movable carrier 20 is reduced, and the risk of the movable carrier 20 tilting is reduced.

[0070] In some optional embodiments, the fixed frame 10 includes a second frame side portion 14 and a third frame side portion 15 adjacent to the first frame side portion 11, the second frame side portion 14 and the third frame side portion 15 are arranged opposite to each other and form a certain angle with the first frame side portion 11 respectively, the first inner protrusion 12 is arranged on the second frame side portion 14 and on a side relatively close to the first frame side portion 11, and a space suitable for accommodating the first outer protrusion 22 and the first support member 31 is formed between the first inner protrusion 12 and the first frame side portion 11, the second inner protrusion 13 is arranged on the third frame side portion 15 and on a side relatively close to the first frame side portion 11, and a space suitable for accommodating the second outer protrusion 23 and the second support member 32 is formed between the second inner protrusion 13 and the first frame side portion 11.

[0071] In some optional embodiments, the movable carrier 20 includes a second carrier side portion 24 and a third carrier side portion 25 adjacent to the first carrier side portion 21, the second carrier side portion 24 and the third carrier side portion 25 are arranged opposite to each other and intersect with the first carrier side portion 21 respectively, the left end of the first carrier side portion 21 protrudes to the left relative to the second carrier side portion 24 to form a first outer protrusion 22, and a space suitable for accommodating the first inner protrusion 12 and the first support member 31 is formed between the first outer protrusion 22 and the second carrier side portion 24, the right end of the first carrier side portion 21 protrudes to the right relative to the third carrier side portion 25 to form a second outer protrusion 23, and a space suitable for accommodating the second inner protrusion 13 and the second support member 32 is formed between the second outer protrusion 23 and the third carrier side portion 25.

[0072] Furthermore, in order to achieve symmetrical arrangement of the first support member 31 and the second support member 32 with respect to the drive assembly 40, the drive assembly 40 is arranged at the center of the first frame side portion 11, the first inner protrusion 12 and the second inner protrusion 13 are symmetrically arranged with respect to the drive assembly 40, and the first outer protrusion 22 and the second outer protrusion 23 are symmetrically arranged with respect to the drive assembly 40.

[0073] In some optional embodiments, a first guide groove 121 is provided on the first inner convex portion 12, and a second guide groove 221 is provided on the first outer convex portion 22. The first guide groove 121 and the second guide groove 221 are arranged opposite to each other and cooperate to form a first channel 2a extending along the first direction. The first support member 31 is arranged in the first channel 2a to guide the movement direction of the movable carrier 20. It can be understood that the first support member 31 is continuously clamped in the guide grooves on both sides. When the movable carrier 20 moves relative to the fixed frame 10, the first support member 31 cooperates with the guide grooves on both sides to limit the movement direction of the movable carrier 20 and guide the movable carrier 20 to move along the first direction. That is to say, in addition to supporting the movable carrier 20, the first support member 31 can also play a positioning role.

[0074] Specifically, in this embodiment, the first direction is the optical axis direction, and, as Figure 7 As shown, the first guide groove 121 and the second guide groove 221 are a group of V-shaped grooves with notches arranged opposite to each other. The first guide groove 121 and the second guide groove 221 clamp and fix the cylindrical first support member 31 in the first channel 2a.

[0075] In some optional embodiments, similar to the assembly structure of the first support member 31, a third guide groove is provided on the second inner protrusion 13, and a fourth guide groove is provided on the second outer protrusion 23. The third guide groove and the fourth guide groove are arranged opposite to each other and cooperate to form a second channel 2b extending along the first direction. The second support member 32 is arranged in the second channel 2b, which can also play a role in guiding the movement direction of the movable carrier 20.

[0076] However, in the actual production and assembly process of the piezoelectric motor in this optional embodiment, due to certain manufacturing tolerances and assembly tolerances of the fixed frame 10 and the movable carrier 20, there may be a certain offset between the actual position of each guide groove and the theoretically preset position, making it difficult to align the two sets of guide grooves at the same time, and the misalignment between the two relative guide grooves will inevitably cause the corresponding support assembly 30 to be difficult to assemble or not properly assembled. For example, after aligning the first guide groove 121 with the second guide groove 221, there may be a misalignment between the third guide groove and the fourth guide groove, making it difficult to install the second support member 32 into the second channel 2b. In other words, Figure 3 The angles shown are for reference only. If the first support member 31 and the second support member 32 are to simultaneously play a role in positioning the movable carrier 20 in the left-right direction, extremely high processing accuracy is required when manufacturing the piezoelectric motor, which requires a relatively high processing cost.

[0077] In the present application, a first support portion 131 is provided on the second inner convex portion 13, a second support portion 231 is provided on the second outer convex portion 23, the first support portion 131 and the second support portion 231 are arranged opposite to each other, and cooperate to form a second channel 2b extending along the first direction, and the second support member 32 is arranged in the second channel 2b. Specifically, the first support portion 131 is provided on a side of the second inner convex portion 13 facing the first frame side portion 11, and the second support portion 231 is provided on a side of the second outer convex portion 23 facing away from the first frame side portion 11. The first support member 31 cooperates with the second support member 32 to form a support surface, so that the movable carrier 20 is stably supported on the fixed frame 10. Furthermore, the second inner convex portion 13 can be implemented as the same structure as the first inner convex portion 12, for example, a third guide groove opposite to the first guide groove 121 is provided, and the third guide groove is used as the first support portion 131. The second inner convex portion 13 can also be implemented as a structure different from the first inner convex portion 12, that is, in this case, the first support portion 131 can be implemented as a structure different from the first guide groove 121. The second outer convex portion 23 and the second support portion 231 are the same.

[0078] As an improvement, in some optional embodiments, the first support member 31 supports and positions the movable carrier 20, and the second support member 32 supports the movable carrier 20 but does not position it, which can solve the problem of the second support member 32 being difficult to assemble.

[0079] Specifically, at least one of the first support portion 131 and the second support portion 231 is provided with a support plane 202 suitable for contacting with the second support member 32, and the second support member 32 is suitable for adjusting its position perpendicular to the first direction along the support plane 202. Therefore, even if there is a certain range of misalignment between the first support portion 131 and the second support portion 231, the second support member 32 can still be easily assembled into the second channel 2b between the first support portion 131 and the second support portion 231. In other words, the provision of the support plane 202 allows a certain range of manufacturing tolerances between the fixed frame 10 and the movable carrier 20, reduces the precision requirements for the processing and manufacturing of the fixed frame 10 and the movable carrier 20, and reduces the difficulty and cost of processing and assembly.

[0080] More specifically, Figure 8 As shown, in this embodiment, at least one of the first supporting portion 131 and the second supporting portion 231 is provided with a supporting plane 202 suitable for contacting the second supporting member 32. Specifically, the first supporting portion 131 on the second inner convex portion 13 is provided with a plane groove, and the plane groove has a certain width in the left-right direction, that is, in a direction perpendicular to the optical axis direction and the pre-pressure P direction at the same time, so that the second supporting member 32 can adjust its position in the left-right direction along the bottom of the plane groove, and at this time, the bottom of the plane groove constitutes a supporting plane 202. The second supporting portion 231 on the second outer convex portion 23 is not provided with a groove, but directly provides a plane extending in the left-right direction with a certain width, so that the second supporting member 32 can slide left and right along this plane, that is, along the second supporting portion 231 to adjust its position. At this time, this plane is another supporting plane 202.

[0081] Furthermore, when the first support portion 131 is set as a planar groove, the left side wall and the right side wall of the planar groove are respectively extended toward the second support portion 231, thereby forming two limiting surfaces on the left and right sides, which can limit the movement range of the second support member 32 in the left and right directions, and prevent the second support member 32 from escaping from the second channel 2b in the left and right directions.

[0082] In other embodiments, the first support portion 131 may also be configured as a non-planar groove structure, and the second support portion 231 may also be configured as a planar groove structure, as long as at least one supporting plane 202 can be provided. In addition, the specific structure and setting position of the limiting surface are not specifically limited, as long as it can prevent the second support member 32 from escaping from the second channel 2b in the left and right directions. For example, one of the first support portion 131 and the second support portion 231 may be configured as a V-shaped groove, and the other may be configured as a planar groove. The second support member 32 may be slid and fine-tuned along the bottom of the planar groove during assembly, and may be inserted into the V-shaped groove and limited by the V-shaped groove. Alternatively, both the first support portion 131 and the second support portion 231 may be configured as planar groove structures.

[0083] In some optional embodiments, the first support member 31 is a first guide rod, and the second support member 32 is a second guide rod. Both the first guide rod and the second guide rod are arranged between the fixed frame 10 and the movable carrier 20 parallel to the optical axis and are in line contact with the fixed frame 10 and the movable carrier 20 respectively.

[0084] In another optional embodiment, the first support member 31 and the second support member 32 may also be balls, which are in point contact with the fixed frame 10 and the movable carrier 20. Further, the first support member 31 includes at least two balls spaced apart along the extending direction of the first channel 2a, and the second support member 32 includes at least two balls spaced apart along the extending direction of the second channel 2b, so as to provide more stable support for the movable carrier 20.

[0085] In some optional embodiments, the first support member 31 is disposed in the first channel 2a and is suitable for moving along the first direction, and the second support member 32 is disposed in the second channel 2b and is at least suitable for moving along the first direction.

[0086] It can be understood that, although the present application records the support assembly 30 on the left side of the driving assembly 40 as the first support member 31 and the support assembly 30 on the right side of the driving assembly 40 as the second support member 32, in fact, the first support member 31 may also be the support assembly 30 on the right side of the driving assembly 40, and the second support member 32 may also be the support assembly 30 on the left side of the driving assembly 40. The first inner convex portion 12, the second inner convex portion 13, the first outer convex portion 22, the second outer convex portion 23 and other structures are similar.

[0087] It should be noted that when the support assembly 30 and the movable carrier 20 are in non-point contact, for example, when the support assembly 30 is a guide rod, the protrusion 201 provided to reduce the contact area between the movable carrier 20 and the guide rod does not conflict with the second guide groove 221 and the second support portion 231. Figure 6 As shown, in this embodiment, the second guide groove 221 is a V-shaped groove, which contacts the guide rod with two side walls, and the middle of the two side walls of the V-shaped groove is recessed downward to avoid contact with the guide rod, and the two ends of the two side walls of the V-shaped groove are respectively protruding to form a part, so-called protrusion 201. The second supporting portion 231 is actually equivalent to the side of the protrusion 201 away from the first frame side portion 11 of the fixed frame 10, that is, the second outer protrusion 23 is provided with a part of the protrusion 201, and the side of this part of the protrusion 201 opposite to the third carrier side portion 25 forms the second supporting portion 231.

[0088] In order to more clearly illustrate the solution of the present application, the present application further discloses the relevant structure of the pre-pressing component 41 in the driving component 40.

[0089] In some optional embodiments, the pre-pressing component 41 is an elastic structure, such as a spring sheet 410. Specifically, the spring sheet 410 can be bonded to the actuating component 42 by glue.

[0090] In some optional embodiments, considering that the spring piece 410 will deform with the piezoelectric vibrator 422, causing the preload P to act on the movable carrier 20 obliquely, thereby causing the movable carrier 20 to tilt, the present application improves the preload component 41: Figure 4 and Figure 9-12 As shown, the pre-pressing assembly 41 includes a structural member 411 and a buffer member 412. The structural member 411 is connected to the fixed frame 10. The buffer member 412 is disposed between the structural member 411 and the actuating assembly 42 and is adapted to be deformed by being squeezed by the structural member 411 and the actuating assembly 42. In other words, the actuating assembly 42 is attached to the structural member 411 through the buffer member 412.

[0091] In the prior art, the pre-stressing assembly 41 will deform and bend, causing the actuating assembly 42 to tilt relative to the movable carrier 20, and then the actuating assembly 42 drives the movable carrier 20 to move at inconsistent speeds in two opposite directions relative to the fixed frame 10, affecting the driving effect of the piezoelectric motor. The present application improves the structure of the pre-stressing assembly 41, and the structural member 411 will not be significantly deformed under the action of the pre-stressing pressure P, which can prevent the actuating assembly 42 from tilting relative to the movable carrier 20, improve the driving effect of the piezoelectric motor, and then improve the shooting effect of the camera module. Since the buffer 412 can be deformed, the buffer 412 is set between the structural member 411 and the actuating assembly 42. When assembling the piezoelectric motor, the deformation of the buffer 412 can offset at least part of the change in the pre-stressing pressure P caused by the material tolerance and the assembly tolerance, thereby improving the consistency of the pre-stressing pressure P in multiple piezoelectric motors in the same batch. In addition, the problem that the piezoelectric vibrator 422 in the actuator component 42 and the spring 410 form a rigid whole due to the large elastic modulus of adhesives such as UV glue or thermosetting glue after curing, which affects the vibration mode of the piezoelectric vibrator 422 and thus affects the driving effect, is solved. The buffer member 412 of the present application can absorb part of the deformation of the piezoelectric vibrator 422, which is conducive to maintaining the setting angle of the piezoelectric vibrator 422 relative to the movable carrier 20, so that the actual movement state of the piezoelectric vibrator 422 is close to the design value, reducing the influence of the external environment, such as the deformation of the pre-loading component 41, on the movement of the piezoelectric vibrator 422.

[0092] Specific, combined Figure 4 , Fig. 9As shown, the movable carrier 20 is arranged in the fixed frame 10, and the fixed frame 10 is provided with an opening 111 that penetrates both sides of the fixed frame 10. The structural member 411 is arranged outside the fixed frame 10, and the size of the structural member 411 in at least one direction is larger than the size of the opening 111, so that the structural member 411 can be fixed outside the fixed frame 10, and the buffer member 412 and the actuating assembly 42 pass through the opening 111, so that the actuating assembly 42 can abut against the movable carrier 20. It should be understood that the length and width of the opening 111 are greater than or equal to the length and width of the actuating assembly 42 and the buffer member 412, so that the actuating assembly 42 and the buffer member 412 can pass through the opening 111 so that the actuating assembly 42 can abut against the movable carrier 20. The piezoelectric vibrator 422 is accommodated in the opening 111, reducing the size increase caused by the external placement of the piezoelectric vibrator 422, and reducing the size of the piezoelectric motor. It should be noted that in the present application, the size of the components such as the buffer 412, the piezoelectric vibrator 422 in the driving component 40, and the opening 111 on the fixed frame 10 refers to the size of the projection of each component on the structural component 411 along the installation direction between the actuator component 42, the buffer 412, and the structural component 411.

[0093] More specifically, the buffer member 412 is in the form of a thin sheet, which is respectively used to be parallel to the two side surfaces attached to the actuating assembly 42 and the structural member 411, that is, the outer side surface of the buffer member 412 is arranged in parallel with the inner side surface, and the side of the structural member 411 facing the buffer member 412 is a plane, which is connected to the outer side surface of the fixed frame 10 and the actuating assembly 42, so that the actuating assembly 42 can be kept parallel to the structural member 411, thereby maintaining the parallelism of the actuating assembly 42 relative to the movable carrier 20 and the fixed frame 10, so that the actuating assembly 42 is arranged in parallel between the movable carrier 20 and the fixed frame 10.

[0094] Considering that the buffer 412 can spontaneously generate adaptive deformation, which can offset at least part of the material tolerance and assembly tolerance and reduce the difference in the preload pressure P among multiple piezoelectric motors in the same batch, the consistency of the preload pressure P of each piezoelectric motor still needs to be improved.

[0095] To this end, the present application adjusts the pressure applied to the structural component 411 during the assembly process of the piezoelectric motor, so that the structural component 411 gradually approaches the movable carrier 20, and adjusts the degree of extrusion and deformation of the buffer component 412, thereby setting the pre-pressure P of the piezoelectric motor at a preset value in the initial state, and then fixes the structural component 411 on the fixed frame 10, and fixes the distance between the structural component 411 and the outer side surface of the fixed frame 10 to maintain the preset size of the pre-pressure P, so that the consistency of the pre-pressure P in multiple piezoelectric motors is significantly improved.

[0096] In view of the differences in material tolerances and assembly tolerances between different piezoelectric motors, in piezoelectric motors with smaller tolerances, when the structural member 411 moves a shorter distance toward the movable carrier 20, the preload P value generated by the preload assembly 41 may have reached a preset value. At this time, there is a gap between the side of the structural member 411 facing the buffer member 412 and the outer side surface of the fixed frame 10.

[0097] In some optional embodiments, such as Fig.12 As shown, the structural member 411 is connected to the fixed frame 10 through the adhesive 61, and the adhesive 61 covers at least a portion of the peripheral side of the structural member 411. It can be understood that if the adhesive 61 is set between the side of the structural member 411 facing the fixed frame 10 and the outer side of the fixed frame 10, when applying the glue, it is necessary to first expose the side of the structural member 411 facing the fixed frame 10 and the outer side of the fixed frame 10 in order to apply the glue, which is inconvenient to operate and is also easy to hinder the assembly step of adjusting the size of the pre-pressure P by applying a force toward the movable carrier 20 to the structural member 411. The method of covering the peripheral side of the structural member 411 with the adhesive 61 is easy to operate and efficient, and is convenient for use in actual assembly. It should be understood that the adhesive 61 covers the outer side of the fixed frame 10 and at least a portion of the peripheral side of the structural member 411 at the same time.

[0098] As an improvement, in some optional embodiments, when the adhesive 61 is coated on the periphery of the structural member 411, the adhesive 61 extends to the side of the structural member 411 that faces away from the fixed frame 10. In other words, part of the adhesive 61 is arranged in the installation direction of the actuating assembly 42, the buffer member 412, and the structural member 411. Such an arrangement enables the adhesive 61 to have a better fixing effect, and tightly presses the structural member 411 toward the fixed frame 10 and the movable carrier 20, thereby continuously and stably providing the pre-pressure P.

[0099] As a supplement, in a specific embodiment, the size of the structural member 411 in a specific direction exceeds the size of the opening 111 on the fixed frame 10. The structural member 411 is rectangular, and along its length direction, the middle of the structural member 411 is arranged opposite to the opening 111, and the two ends of the structural member 411 are opposite to the shell around the opening 111 on the fixed frame 10. The adhesive 61 is coated on both ends of the structural member 411, so that the structural member 411 can be connected to the fixed frame 10. In other specific embodiments, the structural member 411 is set to other shapes. The size of the structural member 411 may be larger than the size of the opening 111 in multiple directions, and multiple ends or the entire periphery of the structural member 411 are opposite to the shell around the opening 111. The adhesive 61 is coated on at least two scattered points on the side of the structural member 411 to achieve the connection between the structural member 411 and the fixed frame 10.

[0100] In a specific embodiment, the adhesive 61 is UV glue. UV glue, also known as ultraviolet glue, is a single-component UV visible light-cured modified acrylic structural adhesive. UV glue is a type of adhesive that is cured by ultraviolet light irradiation. In a specific embodiment, when assembling the piezoelectric motor, UV glue can be first applied to the side of the structural member 411 facing the fixed frame 10 and the outer side of the fixed frame 10, and then the glue is cured by UV light, i.e., ultraviolet irradiation, to complete the fixation of the structural member 411. At this time, the distance between the structural member 411 and the fixed frame 10 is determined, and the pre-pressure P is at the initial preset value. Of course, the UV glue can also be coated on the peripheral side of the structural member 411 so that the UV glue is in contact with the outer side of the fixed frame 10 at the same time.

[0101] In a specific embodiment, the adhesive is UV thermosetting adhesive, which is a type of adhesive that can be cured by ultraviolet rays, heating, or baking. In a specific embodiment, when assembling the piezoelectric motor, the UV thermosetting adhesive can be first applied to the structural member 411 and the fixed frame 10 and irradiated with ultraviolet rays to preliminarily fix the structural member 411 on the fixed frame 10. After the spacing between the structural member 411 and the fixed frame 10 is determined, heating is performed to achieve complete curing of the UV thermosetting adhesive.

[0102] In some optional embodiments, the structural member 411 is fixed to the outer surface of the fixed frame 10 by welding, hot riveting, etc.

[0103] In some optional embodiments, the buffer 412 can be implemented as a tape, and the two opposite surfaces of the buffer 412 are respectively bonded to the structural member 411 and the actuator assembly 42. Compared with the glue connection method, the tape connection has at least three advantages: first, it avoids the use of high elastic modulus glue, such as UV glue with an elastic modulus of at least 1GPa after curing, which will affect the deformation of the buffer 412 and the piezoelectric vibrator 422; second, it is easy to operate, and the actuator assembly 42 can be directly attached to the structural member 411 without the steps of coating glue and curing glue; third, the parallelism of the tape is relatively good, and two parallel opposite surfaces can be provided to bond the actuator assembly 42 and the structural member 411 respectively, which is conducive to improving the parallelism of the actuator assembly 42 relative to the fixed frame 10 and the movable carrier 20.

[0104] In some optional embodiments, the size of the buffer 412 is larger than the size of the actuator assembly 42, specifically larger than the size of the piezoelectric vibrator 422 in the actuator assembly 42, so that the buffer 412 can completely fill the space between the actuator assembly 42 and the structural member 411, which is beneficial to ensure the strength of the connection structure and the installation parallelism of the actuator assembly 42.

[0105] For further reference, Fig.10 , Fig.11, this application briefly describes the working principle of the piezoelectric vibrator 422.

[0106] For ease of description, Fig.10 The direction indicated by the arrow indicates the thickness direction of the piezoelectric vibrator 422, that is, the up-down direction, the length direction of the piezoelectric vibrator 422 is used as the front-to-back direction of the piezoelectric vibrator 422, and the width direction is used as the front-to-back direction of the piezoelectric vibrator 422.

[0107] The piezoelectric vibrator 422 has a multi-layer stacked structure. Specifically, the piezoelectric vibrator 422 is stacked in the order of ceramic layer, electrode layer, ceramic layer, electrode layer...ceramic layer, electrode layer, ceramic layer in the thickness direction. Each electrode layer is arranged between two adjacent ceramic layers, and the upper and lower halves of the piezoelectric vibrator 422 are polarized in opposite directions respectively.

[0108] There are four side electrodes on the side of the piezoelectric vibrator 422, which are respectively recorded as the first side electrode 4221, the second side electrode 4222, the third side electrode 4223, and the fourth side electrode 4224. The first side electrode 4221 and the second side electrode 4222 are arranged front to back oppositely and are both arranged on the left side of the piezoelectric vibrator 422, and the third side electrode 4223 and the fourth side electrode 4224 are arranged front to back oppositely and are both arranged on the right side of the piezoelectric vibrator 422. The first side electrode 4221 and the second side electrode 4222 are located on the left and right sides of the front of the piezoelectric vibrator 422, and are respectively suitable for receiving two electrical signals with the same frequency but different phases, such as Fig.11 The second side electrode 4222 and the fourth side electrode are located at the left and right sides behind the piezoelectric vibrator 422 and are grounded respectively.

[0109] It is easy to understand that the access of electrical signals and grounding of the side electrodes are achieved by electrical connection with the flexible circuit board 421 .

[0110] The four side electrodes extend in the thickness direction of the piezoelectric vibrator 422, and are electrically connected to the top electrode layer, the middle electrode layers, and the bottom electrode layer in sequence, so that an electric field is generated between adjacent electrode layers. Under the action of the electric field, the ceramic layer undergoes elongation or contraction deformation. Fig.11 In the figure, arrows facing each other indicate contraction, and arrows facing away indicate extension. Through the multi-layer stacked structure, the electric field formed between each two adjacent electrode layers is superimposed in the vertical direction. Therefore, the voltage required to drive the entire piezoelectric vibrator 422 to flexural vibration is reduced. The number of electrode layers and the number of ceramic layers can be designed according to the specific driving force requirements and voltage requirements that can be provided.

[0111] In order to explain the working principle of the piezoelectric vibrator 422 more clearly, based on the above settings, the piezoelectric vibrator 422 is divided into an upper left section, an upper right section, a lower left section, and a lower right section, and when the side electrode is connected to the electrical signal, four time points from t1 to t4 are intercepted for observation. The piezoelectric vibrator 422 generates the following signals at the four moments t1, t2, t3, and t4: Fig.11 In the four deformation states shown in the figure, at time t1, the upper left section and the upper right section contract, the lower left section and the lower right section extend, the piezoelectric vibrator 422 bends upward, and the friction head 423 moves downward relatively. At time t2, the upper left section and the lower right section contract, and the lower left section and the upper right section extend, so that the left side of the piezoelectric vibrator 422 bends upward and the right side bends downward, and the friction head 423 moves to the upper left. At time t3 and time t4, the friction head 423 first moves upward and then moves to the lower right. The next time the input electrical signal is the same as t1, the friction head 423 moves downward to the same position as t1, and the piezoelectric vibrator 422 switches between the four deformation states, so that the friction head 423 fixed to the upper surface of the piezoelectric vibrator 422 produces the elliptical motion shown in the figure. The friction head 423 is able to push the movable carrier 20 to move through high frequency.

[0112] In some embodiments, in order to improve the driving performance of the piezoelectric motor, the piezoelectric vibrator 422 can be made of piezoelectric ceramic material or piezoelectric single crystal material. The piezoelectric vibrator 422 can be a single-layer ceramic body or a single-layer single crystal, or a multi-layer ceramic body or a multi-layer single crystal, for example, 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, etc.

[0113] In some embodiments, the friction head 423 is made of wear-resistant material, for example, it can be made of various high-hardness wear-resistant ceramic materials, such as aluminum oxide, zirconium oxide, silicon carbide ceramics, or high-wear-resistant metal materials, carbon fiber materials, or composite materials of ceramics, metal particles and polymers, etc., so as to improve the wear resistance of the friction head 423, which is beneficial to increase the friction force between the movable carrier 20 and the friction head 423, that is, it is beneficial to increase the driving force, and due to the wear resistance, it is beneficial to extend the service life of the friction head 423.

[0114] In contrast, in some embodiments, reference Figure 7 As shown, a wear-resistant portion 26 is provided on the movable carrier 20, and the friction head 423 abuts against the wear-resistant portion 26. Specifically, the wear-resistant portion 26 can be a wear-resistant coating, or a friction-resistant plate assembled on the movable carrier 20 by bonding, insert injection molding, etc., or an uneven outer surface of the movable carrier 20, etc., which can achieve a friction-resistant structure. The provision of the wear-resistant portion 26 is beneficial to improving the friction between the movable carrier 20 and the friction head 423, that is, it is beneficial to improving the driving force, and because of the wear resistance, it is beneficial to extend the service life.

[0115] Furthermore, when the wear-resistant portion 26 is set as a friction-resistant plate, it can be fixed on the movable carrier 20 by bonding, fastener connection, insert injection molding, etc. to form an integrated force-bearing structure with the movable carrier 20, and referring to the material of the friction head 423, the friction-resistant plate can be made of the same or different wear-resistant material as the friction head 423.

[0116] It is understood that the present application does not impose any specific restrictions on the specific shapes of the friction head 423 and the friction-resistant plate. In a specific embodiment, the friction head 423 may be in the shape of a sphere, a hemisphere, a cuboid, a table, a cylinder, a semi-cylinder, etc., and the friction-resistant plate may be in the shape of a sheet or a block. In one example of the present application, the friction head 423 is in the shape of a cylinder. Figure 2 Vertically as shown, or as Fig.10 As shown, it is placed horizontally on the piezoelectric vibrator 422 to provide line friction between the driving component 40 and the movable carrier 20. The line contact between the friction head 423 and the wear-resistant part 26 of the movable carrier 20 has greater friction than the point contact method, and has better driving force and driving effect.

[0117] The number of friction heads 423 may be one or two or more. In the present embodiment, the piezoelectric vibrator 422 is in the shape of a rectangular strip, and the friction head 423 is protrudingly arranged at the center position of the side of the piezoelectric vibrator 422 facing the movable carrier 20, which can increase the unit driving stroke of the friction head 423. In another embodiment, the number of friction heads 423 is two, and the two friction heads 423 are arranged at intervals along the length direction of the piezoelectric vibrator 422, and the length direction of the piezoelectric vibrator 422 is parallel to the movement direction of the movable carrier 20 driven by it. In the driving direction along the driving component, at least two friction heads 423 are provided on the side of the piezoelectric vibrator 422 facing the movable carrier 20, thereby increasing the driving stroke.

[0118] In some embodiments, the friction head 423 and the piezoelectric vibrator 422 can be an integrated structure or a detachable structure. The friction head 423 and the piezoelectric vibrator 422 can be fixed to the piezoelectric vibrator 422 by bonding, snapping, nesting, welding or fastener connection. The friction head 423 and the piezoelectric vibrator 422 are in surface contact to ensure the connection strength. The friction head 423 can produce obvious movement with the deformation of the piezoelectric vibrator 422.

[0119] The present application can also provide a camera module, which includes: the above-mentioned piezoelectric motor, a lens assembly, and a photosensitive assembly, wherein the lens assembly is arranged in the piezoelectric motor, and the photosensitive assembly is arranged relative to the lens assembly. Since the movable carrier equipped with the optical lens can be adjusted smoothly, it is conducive to realizing the focusing function and improving the imaging quality.

[0120] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A piezoelectric motor, applied to a camera module, characterized in that: include: Fixed frame; A movable carrier, the movable carrier being movably arranged on the fixed frame; A driving assembly, the driving assembly is connected to the fixed frame and abuts against the movable carrier; A support assembly, wherein the support assembly is disposed between the fixed frame and the movable carrier, and the support assembly cooperates with the driving assembly so that the movable carrier is supported on the fixed frame; and the driving assembly and the support assembly are disposed on the same side of the piezoelectric motor.

2. The piezoelectric motor according to claim 1, wherein: The supporting assembly is a guide rod, and the movable carrier is provided with at least two protrusions suitable for contacting the guide rod, and the at least two protrusions are arranged at intervals in a direction parallel to the length direction of the guide rod.

3. The piezoelectric motor according to claim 2, wherein: The movable carrier is provided with two protrusions, and the two protrusions are located at two ends of the movable carrier, and the middle part of the movable carrier is relatively recessed to be separated from the middle part of the supporting assembly.

4. The piezoelectric motor according to any one of claims 1 to 3, characterized in that: The support assembly includes a first support member and a second support member, and the first support member and the second support member are respectively located on two sides of the driving assembly.

5. The piezoelectric motor according to claim 4, wherein: The first support member and the second support member are symmetrically arranged on both sides of the driving assembly.

6. The piezoelectric motor according to claim 4, wherein: The fixed frame has a first frame side portion, the movable carrier has a first carrier side portion, the first frame side portion is arranged opposite to the first carrier side portion, the driving assembly is arranged between the first frame side portion and the first frame side portion, the fixed frame is provided with a first inner convex portion and a second inner convex portion protruding toward the movable carrier, both ends of the first carrier side portion are provided with a first outer convex portion and a second outer convex portion protruding toward the fixed frame, the first outer convex portion is located between the first frame side portion and the first inner convex portion, the second outer convex portion is located between the first frame side portion and the second inner convex portion, the first support member is located between the first outer convex portion and the first inner convex portion, and the second support member is located between the second outer convex portion and the second inner convex portion.

7. The piezoelectric motor according to claim 6, wherein: A first guide groove is provided on the first inner convex portion, and a second guide groove is provided on the first outer convex portion. The first guide groove and the second guide groove are arranged opposite to each other and cooperate to form a first channel extending along a first direction. The first support member is arranged in the first channel to guide the movement direction of the movable carrier; a first support portion is provided on the second inner convex portion, and a second support portion is provided on the second outer convex portion. The first support portion and the second support portion are arranged opposite to each other and cooperate to form a second channel extending along the first direction. The second support member is arranged in the second channel.

8. The piezoelectric motor according to claim 7, wherein: At least one of the first supporting portion and the second supporting portion is provided with a supporting plane suitable for contacting the second supporting member, and the second supporting member is suitable for adjusting a position in a direction perpendicular to the first direction along the supporting plane.

9. The piezoelectric motor according to claim 7, wherein: The first support member is disposed in the first channel and is suitable for moving along a first direction. The second support member is disposed in the second channel and is suitable for moving along at least the first direction.

10. The piezoelectric motor according to any one of claims 1 to 3, characterized in that: The driving assembly includes a pre-stressing assembly and an actuating assembly, wherein the pre-stressing assembly is connected to the fixed frame, and the actuating assembly is connected to the pre-stressing assembly, wherein the pre-stressing assembly provides pre-stress to the actuating assembly so that the driving end of the actuating assembly abuts against the movable carrier and the pre-stressing is applied to the movable carrier, so that the actuating assembly is suitable for driving the movable carrier to move relative to the fixed frame when receiving a driving signal.

11. The piezoelectric motor according to claim 10, wherein: The pre-pressing assembly includes a structural member and a buffer member, wherein the structural member is connected to the fixing frame, and the buffer member is arranged between the structural member and the actuating assembly and is suitable for being deformed by being squeezed by the structural member and the actuating assembly.

12. A camera module, characterized in that: include: The piezoelectric motor according to any one of claims 1 to 11; A lens assembly, disposed in the piezoelectric motor; as well as The photosensitive component is arranged relative to the lens component.

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