Driving motor, camera module and electronic device

Abstract

The application provides a driving motor, a camera module and an electronic device. The driving motor comprises a fixed part, a moving part and a supporting assembly. The fixed part comprises a base and a shell covered on the base. The moving part is used for carrying an optical lens and is movably installed on the base. The shell is covered on the outer periphery of the moving part. The supporting assembly comprises a shaft member and a first motion conversion piece. The shaft member is installed on the base. The first motion conversion piece is movably sleeved on the shaft member and is connected with the moving part to allow the moving part to move along a first linear direction relative to the shaft member through the first motion conversion piece. When the moving part is driven to move in a plane perpendicular to the first linear direction, the moving part can drive the shaft member to move in the plane relative to the fixed part. The first linear direction is parallel to the optical axis direction of the optical lens. The driving motor has a significantly reduced number of parts, thereby reducing material cost, simplifying assembly process and improving product yield.

Description

Technical Field

[0001] This invention belongs to the field of camera equipment technology, and more specifically, relates to a drive motor, camera module and electronic equipment. Background Technology

[0002] With the rapid development of portable electronic devices such as smartphones and tablets, the demand for miniaturization and high performance of camera modules is becoming increasingly urgent. Lens drive motors usually need to simultaneously achieve two major functions: autofocus (AF) and optical image stabilization (OIS). These correspond to displacement compensation along the optical axis of the optical lens and shake compensation in the plane perpendicular to the optical axis, respectively. How to integrate the above functions in a limited space while ensuring motion accuracy and structural reliability has become the core direction of technological breakthroughs in this field.

[0003] Existing conventional solutions typically employ a stacked structure of "AF mover supporting OIS assembly" or "OIS mover supporting AF assembly." Taking a typical ball-guided image stabilization motor as an example, it usually includes: a bracket for achieving OIS planar movement, an AF mover for supporting the optical lens, and multiple balls respectively disposed on the upper and lower sides of the bracket. The bracket is supported on the base by the bottom balls and can move along the XY plane, while the AF mover is supported on the bracket by the top balls and can move along the Z-axis. To maintain the stable suspension and guidance of the AF mover, an upper spring (F spring) and a lower spring (B spring) are also required to connect the AF mover to the bracket and provide a restoring force and electrical path. In addition, multiple precision grooves need to be formed on the bracket and corresponding structural components to accommodate and constrain the multiple balls.

[0004] The aforementioned stacked structure results in a large number of motor components, including at least a bracket, AF mover, upper spring, lower spring, multiple sets of ball bearings, and multiple grooved machining structures, making the assembly process complex. Summary of the Invention

[0005] The present invention provides a drive motor, a camera module, and an electronic device, which can simplify the number of motor components and facilitate structural miniaturization.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The first aspect of the present invention provides a drive motor, comprising:

[0007] The fixing part includes a base and a housing disposed on the base;

[0008] A movable part for carrying an optical lens is movably mounted to the base, and the housing covers the outer periphery of the movable part;

[0009] The support assembly includes a shaft member and a first motion conversion member. The shaft member is mounted on the base, and the first motion conversion member is movably sleeved on the shaft member and connected to the moving part, allowing the moving part to move relative to the shaft member along a first linear direction via the first motion conversion member. When the moving part is driven to move in a plane perpendicular to the first linear direction, the moving part can drive the shaft member to move relative to the fixed part in the plane, where the first linear direction is parallel to the optical axis of the optical lens.

[0010] In one embodiment, the first motion conversion component includes a bearing, the inner ring of which is slidably engaged with the shaft member, and the outer ring of which is fixed to the moving part.

[0011] In one embodiment, the movable part is provided with a mounting notch, and the outer ring of the bearing is at least partially accommodated within the mounting notch.

[0012] In one embodiment, the bearing is a ball bearing; balls are disposed between the outer ring and the inner ring of the bearing, and the balls are in rolling contact with the shaft component.

[0013] In one embodiment, the support assembly further includes two second motion conversion members, which are respectively disposed at both ends of the shaft member along the first straight direction and roll in contact with the fixed part, such that when the moving part is driven to move in a plane perpendicular to the first straight direction, the moving part can drive the second motion conversion members to move relative to the fixed part in the plane.

[0014] In one embodiment, the second motion converter is a ball bearing.

[0015] In one embodiment, the shaft component includes a first part and a second part; one end of the first part is provided with a convex shaft section, and the outer periphery of the convex shaft section is provided with an external thread; one end of the second part is provided with a concave hole, and the inner wall of the concave hole is provided with an internal thread that mates with the external thread; the convex shaft section is screwed into the concave hole, so that the first part and the second part are coaxially and fixedly connected; the first part and the second part have the same diameter, and a smooth transition outer circumferential surface is formed at the connection.

[0016] In one embodiment, the two ends of the shaft member are provided with recesses or mounting grooves for accommodating and retaining the balls.

[0017] In one embodiment, the recess or mounting groove is a ball-and-socket structure that forms a ball-and-socket fit with the ball.

[0018] In one embodiment, a limiting part is further included, which is disposed on the fixed part. A preset movement gap is formed between the moving part and the limiting part in a plane perpendicular to the first straight line direction. When the displacement of the moving part in the plane reaches the movement gap, the moving part abuts against the limiting part to restrict further movement of the moving part in the plane.

[0019] In one embodiment, the drive motor further includes a first drive structure and a second drive structure, wherein the first drive structure is used to drive the moving part to move along the first straight line direction, and the second drive structure is used to drive the moving part to move in a plane perpendicular to the first straight line direction.

[0020] In one embodiment, the first driving structure is an electromagnetic driving assembly, which includes a first driving magnet and a focusing coil. The first driving magnet is disposed on the moving part, and the focusing coil is disposed on the fixed part. Alternatively, the first driving magnet is disposed on the fixed part, and the focusing coil is disposed on the moving part.

[0021] In one embodiment, the second driving structure is an electromagnetic driving assembly. The second driving structure includes a second driving magnet and a de-shaking coil. The second driving magnet is disposed on the moving part, and the de-shaking coil is disposed on the fixed part. Alternatively, the second driving magnet is disposed on the fixed part, and the de-shaking coil is disposed on the moving part. The de-shaking coil is arranged symmetrically along the circumferential direction.

[0022] In one embodiment, the first driving structure and the second driving structure share the same driving magnet disposed on the moving part.

[0023] In one embodiment, the first driving structure includes a shape memory alloy spring, one end of which is fixed to the housing, and the other end of which is fixed to the moving part.

[0024] In one embodiment, at least one temperature-sensitive thermistor is further included; the temperature-sensitive thermistor is disposed on the moving part or the fixed part and is thermally coupled to the shape memory alloy spring; the temperature-sensitive thermistor is used to detect the temperature of the shape memory alloy spring and output a corresponding electrical signal.

[0025] In one embodiment, the number of shape memory alloy springs is four, and the four shape memory alloy springs are distributed in a cross-shaped symmetrical distribution or a rectangular four-corner distribution.

[0026] In one embodiment, the shape memory alloy spring includes a first set of springs and a second set of springs symmetrical along the optical axis of the optical lens; the first set of springs is powered by a first driving circuit, and the second set of springs is powered by a second driving circuit; the first driving circuit and the second driving circuit are configured to simultaneously output the same driving current to reduce the response delay of the moving part moving along the optical axis; or, the first driving circuit and the second driving circuit are configured to output different driving currents respectively to cause the moving part to tilt.

[0027] In one embodiment, a reset element is further included, the reset element being configured to provide a restoring force to the moving part tending to an initial position;

[0028] The reset element includes a magnetic absorbing piece disposed on the base for magnetically engaging with a magnetic absorbing part disposed on the moving part.

[0029] A second aspect of the present invention provides a camera module including a drive motor as described above.

[0030] A third aspect of the present invention provides an electronic device including a drive motor as described above.

[0031] The drive motor provided by this invention includes a fixed part, a movable part, and a support assembly. The fixed part includes a base and a housing mounted on the base. The movable part is used to carry an optical lens and is movably mounted to the base. The housing covers the outer periphery of the movable part. The support assembly includes a shaft member and a first motion conversion member. The shaft member is mounted on the base. The first motion conversion member is movably sleeved on the shaft member and connected to the movable part, allowing the movable part to move relative to the shaft member along a first linear direction via the first motion conversion member. When the movable part is driven to move in a plane perpendicular to the first linear direction, the movable part can drive the shaft member to move relative to the fixed part in the plane. The first linear direction is parallel to the optical axis of the optical lens. This drive motor, through the integrated support assembly of the movable part, the first motion conversion member, and the shaft member, eliminates parts such as brackets, upper springs, and lower springs found in existing drive motors, while significantly reducing the amount of ball bearings. The significant reduction in the number of parts reduces material costs, simplifies assembly processes, and improves product yield. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the drive motor provided in an embodiment of the present invention;

[0034] Figure 2 Provided for embodiments of the present invention Figure 1 Exploded view of the drive motor;

[0035] Figure 3 A schematic diagram of the structure of the moving part of the drive motor provided in an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of the structure of the support assembly of the drive motor installed on the moving part according to an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of the structure of the support assembly for the drive motor provided in an embodiment of the present invention;

[0038] Figure 6 This is a top view of the drive motor after the housing has been removed, according to an embodiment of the present invention.

[0039] Figure 7 A schematic diagram of the first and second drive structures of the drive motor provided in an embodiment of the present invention;

[0040] Figure 8 A schematic diagram of the drive magnet mounting structure of the drive motor provided in an embodiment of the present invention;

[0041] Figure 9 An exploded view of a drive motor provided in an embodiment of the present invention;

[0042] Figure 10 This is a partial structural diagram of a drive motor provided in an embodiment of the present invention. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be understood that the terms “comprising” and “having” as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0045] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. It should be understood that the term "and / or" as used herein is merely a description of the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0047] Existing camera module drive motors typically employ a stacked structure of "AF mover supporting OIS assembly" or "OIS mover supporting AF assembly." Taking a typical ball-guided image stabilization motor as an example, it usually includes: a bracket for achieving OIS planar movement, an AF mover for supporting the optical lens, and multiple balls respectively disposed on the upper and lower sides of the bracket. The bracket is supported on the base by the bottom balls and can move along the XY plane, while the AF mover is supported on the bracket by the top balls and can move along the Z-axis. To maintain the stable suspension and guidance of the AF mover, an upper spring (F spring) and a lower spring (B spring) are also required to connect the AF mover to the bracket and provide a reset force and power supply path. In addition, multiple precision grooves need to be formed on the bracket and corresponding structural components to accommodate and constrain the multiple balls. The aforementioned stacked structure results in a large number of motor components, including at least a bracket, AF mover, upper spring, lower spring, multiple sets of ball bearings, and multiple grooved machining structures. This leads to complex assembly processes, and the multi-stage motion transmission path introduces multiple mating interfaces. Accumulated gaps between these interfaces can easily cause motion lag and response delay, affecting focusing and image stabilization accuracy. This application addresses these problems by providing a drive motor, camera module, and electronic device.

[0048] The drive motor, camera module, and electronic device provided by the present invention will be described in detail below with reference to specific embodiments.

[0049] Figure 1 This is a schematic diagram of the drive motor provided in an embodiment of the present invention. Figure 2 Provided for embodiments of the present invention Figure 1 Exploded view of the drive motor. Figure 3 This is a schematic diagram of the structure of the moving part of the drive motor provided in an embodiment of the present invention. Figure 4 Please refer to the schematic diagram of the support assembly for the drive motor installed on the moving part according to an embodiment of the present invention. Figures 1-4 The first aspect of this embodiment provides a drive motor, including a fixed part 1, a movable part 2, and a support assembly 3. The fixed part 1 includes a base 11 and a housing 12 disposed on the base 11. The movable part 2 is used to carry an optical lens and is movably mounted to the base 11. The housing 12 covers the outer periphery of the movable part 2. The support assembly 3 includes a shaft member 31 and a first motion conversion member 32. The shaft member 31 is mounted on the base. The first motion conversion member 32 is movably sleeved on the shaft member 31 and connected to the movable part 2, so that the movable part 2 can move relative to the shaft member 31 along a first linear direction through the first motion conversion member 32. When the movable part 2 is driven to move in a plane perpendicular to the first linear direction, the movable part 2 can drive the shaft member 31 to move relative to the fixed part 1 in the plane. The first linear direction is parallel to the optical axis direction of the optical lens.

[0050] In this embodiment, the fixing part 1 is the stationary part of the drive motor, providing an installation reference and structural support for the entire module. Specifically, it includes a base 11 and a housing 12. The base 11 is typically an engineering plastic part manufactured using injection molding, located at the bottom of the module, and is used to support the moving part 2 and the support assembly 3. The base 11 has a light-transmitting hole in the center corresponding to the optical lens, and the edge area is provided with winding posts or positioning grooves for mounting the drive coil, as well as mounting seats for fixing the shaft component 31. The housing 12 is a metal shield (usually made of stainless steel) covering the base 11, and is fixedly connected to the base 11 by adhesive or snap-fit, forming a closed electromagnetic shielding space. The housing 12 also serves to prevent dust and light interference.

[0051] In this embodiment, the movable part 2 is a movable component for carrying the optical lens. It is movably mounted on the base 11. The outer shell 12 covers the outer periphery of the movable part 2. The movable part 2 is usually made of lightweight, high-strength engineering plastic and is integrally injection molded. It has a threaded mounting hole (or a press-fit lens barrel mounting seat) in the center that is adapted to the optical lens. A radial gap is maintained between the outer periphery of the movable part 2 and the inner sidewall of the outer shell 12 for the movement of the OIS.

[0052] The support component 3 in this embodiment includes a shaft component 31 and a first motion conversion component 32. The shaft component 31 is an elongated shaft-shaped part mounted on the base 11, extending along the optical axis (first linear direction). The shaft component 31 is made of a high-hardness wear-resistant metal material (such as stainless steel or tungsten steel) or ceramic material, with a surface roughness Ra≤0.2μm to ensure the motion accuracy when mating with the ball bearing. The first motion conversion component 32 is movably sleeved on the shaft component 31 and fixedly connected to the moving part 2. The first motion conversion component 32 can realize the motion conversion between the moving part 2 and the shaft component 31: when the moving part 2 moves along the optical axis, the first motion conversion component 32 slides / rolls along the shaft component 31; when the moving part 2 moves in a plane perpendicular to the optical axis, the first motion conversion component 32 drives the shaft component 31 to move as a whole in that plane.

[0053] This embodiment achieves motion decoupling and integrated support for AF and OIS functions through support component 3. AF motion mode (along the first linear direction / Z-axis): When the focusing drive structure applies a driving force along the optical axis to the moving part 2, the moving part 2 drives the first motion conversion component 32 fixedly connected to it, causing the first motion conversion component 32 to move linearly along the outer circumferential surface of the shaft component 31. At this time, the shaft component 31 remains stationary, and the first motion conversion component 32 acts as a guide sleeve for the moving part 2, precisely constraining the radial degree of freedom of the moving part 2 in the XY plane, allowing only translational movement in the Z-axis direction. This motion mode corresponds to the autofocus function, achieving clear imaging by adjusting the distance between the lens and the image sensor. OIS Motion Mode (in the plane perpendicular to the first straight line / XY plane): When the image stabilization drive structure applies a driving force perpendicular to the optical axis to the moving part 2, the moving part 2 is displaced in the XY plane. Since the first motion conversion member 32 is fixedly connected to the moving part 2 and sleeved on the shaft member 31, the radial displacement of the moving part 2 is directly transmitted to the shaft member 31 through the first motion conversion member 32, forcing the shaft member 31 to move as a whole with the moving part 2 in the XY plane. This motion mode corresponds to the optical image stabilization function, which compensates for the optical path offset caused by hand shake by moving the lens. In this embodiment, the shaft member 31 is provided with second motion conversion members 33 at both ends. The second motion conversion members 33 at both ends of the shaft member 31 make rolling contact with the fixed part 1, converting sliding friction into rolling friction, thereby realizing low-resistance planar movement of the shaft member 31 relative to the fixed part 1.

[0054] In this embodiment, the support component 3 is stationary when the AF moves and the axial component 31 moves when the OIS moves. The moving part 2 can obtain the Z-axis guiding function and the XY plane transmission function simultaneously through a single support component 3, without the need for the independent AF guiding system (such as upper / lower springs) and OIS bearing system (such as bracket) in the traditional solution.

[0055] Traditional AF+OIS integrated motors typically employ a stacked structure of "support + AF mover + upper spring + lower spring + multiple sets of ball bearings." The support carries the AF mover and enables OIS motion. The AF mover is suspended and supported on the support by the upper and lower springs. Multiple ball bearings are located at the bottom and top of the support to achieve low-friction motion. This solution requires at least four independent structural components: the support, the AF mover, the upper spring, and the lower spring, as well as at least 6-8 ball bearings. This invention, through an integrated support assembly 3 consisting of "moving part 2—first motion conversion component 32—shaft component 31," completely eliminates the three independent parts: the support, the upper spring, and the lower spring. Simultaneously, it significantly reduces the number of ball bearings. This significant reduction in the number of components lowers material costs, simplifies assembly processes, reduces cumulative tolerances, and improves product yield.

[0056] In traditional solutions, the OIS driving force must pass through a multi-stage transmission path of "fixed part 1—ball bearing—bracket—spring—AF mover—lens," resulting in gaps and friction at each mating interface, leading to motion lag and response delay. The AF driving force must overcome the elastic deformation resistance of the upper and lower springs, resulting in high power consumption and the risk of spring fatigue fracture. In this embodiment of the invention, the moving part 2 is directly and rigidly connected to the optical lens, the AF driving force acts directly on the moving part 2, and the OIS driving force is directly transmitted through the shaft member 31, significantly shortening the motion chain. In traditional stacked structures, the bracket occupies a certain axial space, and the upper and lower springs need to reserve space for elastic deformation. By eliminating the bracket and springs in this invention, the moving part 2 can directly form a compact layout with the base 11 and the outer shell 12, reducing the axial dimension.

[0057] Figure 5 Please refer to the structural schematic diagram of the support assembly for the drive motor provided in an embodiment of the present invention. Figure 5The first motion conversion component 32 includes a bearing, the inner ring of which is slidably fitted with the shaft member 31, and the outer ring of which is fixedly connected to the moving part 2. Exemplarily, the bearing is a ball bearing, with balls disposed between the outer and inner rings, and the balls making rolling contact with the shaft member 31. In this embodiment, the inner ring of the ball bearing is fitted onto the outer circumferential surface of the shaft member 31 with a clearance fit (or a slight interference fit), ensuring that the inner ring can rotate freely relative to the shaft member 31. The outer ring of the ball bearing is fixedly connected to a pre-set mounting hole / mounting notch on the moving part 2 by an adhesive (such as epoxy resin structural adhesive) or by pressing. During AF motion, the moving part 2 moves along the Z-axis, and the outer ring of the ball bearing moves synchronously with the moving part 2. The inner ring contacts the shaft member 31 through the balls. Due to the rolling contact between the balls and the shaft member 31, the sliding friction between the inner ring and the shaft member 31 is converted into rolling friction, which greatly reduces the guiding resistance. During OIS motion, the moving part 2 moves in the XY plane, and the outer ring of the ball bearing is subjected to the radial force of the moving part 2. This radial force is transmitted to the shaft member 31 through the rolling elements and the inner ring, forcing the shaft member 31 to move accordingly.

[0058] The movable part 2 is provided with an installation notch 21; the outer ring of the ball bearing is at least partially housed within the installation notch 21 and is fixedly connected to the movable part 2; the inner ring of the ball bearing is sleeved on the shaft member 31 and is rotatably engaged with the shaft member 31. Exemplarily, the side wall of the movable part 2 in this embodiment has a C-shaped open installation notch, the width of which is adapted to the diameter of the outer ring of the ball bearing. During assembly, the ball bearing is pushed into the installation notch 21 from the open side, and the outer ring is fixed by adhesive or a lateral pressure plate. The open notch design in this embodiment reduces assembly difficulty, supports automated press-fitting operations, and improves production efficiency.

[0059] Furthermore, the support assembly 3 also includes two second motion conversion elements 33, which are respectively disposed at both ends of the shaft member 31 along the first straight line direction. The second motion conversion elements 33 are configured to roll in contact with the fixed part 1, such that when the moving part 2 is driven to move in a plane perpendicular to the first straight line direction, the moving part 2 can drive the second motion conversion elements 33 to move relative to the fixed part 1 in that plane. In this embodiment, the upper and lower ends of the shaft member 31 are respectively provided with recesses for accommodating the second motion conversion elements 33. Exemplarily, the second motion conversion elements 33 employ high-precision balls, with some balls housed within the recesses and some protruding from the end face of the shaft member 31, forming point contact with the smooth support surface of the fixed part 1 (base 11 or inner side of the housing 12). Compared to sliding contact, rolling contact can reduce friction by more than 85%, significantly reducing OIS drive power consumption. Moreover, rolling motion eliminates stick-slip phenomenon, improving anti-shake compensation accuracy.

[0060] The shaft component 31 includes a first segment 311 and a second segment 312. One end of the first segment 311 has a convex shaft section with external threads on its outer periphery. One end of the second segment 312 has a concave hole with internal threads on its inner wall that mate with the external threads. The convex shaft section is screwed into the concave hole, coaxially connecting the first segment 311 and the second segment 312. The first segment 311 and the second segment 312 have the same diameter and form a smooth transition outer circumferential surface at the connection point. In this embodiment, the shaft component 31 adopts a segmented design. The first segment 311 (upper shaft segment) and the second segment 312 (lower shaft segment) are coaxially connected by precision threads, with thread-locking adhesive applied to the threads to prevent loosening. The threaded connection between the first segment 311 and the second segment 312 of the shaft component 31 in this embodiment achieves low cost, easy assembly, and maintainability, while also ensuring that the guiding accuracy of the ball bearing is not affected by the thread clearance, thus balancing low cost and high precision.

[0061] In this embodiment, the second motion conversion component 33 is a ball bearing, and the two ends of the shaft component 31 are provided with recesses or mounting grooves for accommodating and retaining the ball bearing. In this embodiment, a conical recess or a spherical mounting groove is machined at the center of the end faces of both ends of the shaft component 31. The depth of the recess is less than the radius of the ball bearing, ensuring that the ball bearing protrudes from the end face to contact the fixing part 1. In this embodiment, the recess provides a three-point centering constraint for the ball bearing, so that no matter how the shaft component 31 tilts or shifts, the ball bearing is always constrained at the center of the recess and will not experience radial movement. Optionally, the recess or mounting groove is a ball-and-socket structure, forming a ball-and-socket fit with the ball bearing.

[0062] Figure 6 For a top view of the drive motor after removing the housing according to an embodiment of the present invention, please refer to [link / reference]. Figure 6Furthermore, the drive motor also includes a limiting part 13, which is disposed on the fixed part 1. A preset movement gap exists between the moving part 2 and the limiting part in a plane perpendicular to the first straight line direction. When the displacement of the moving part 2 in the plane reaches the movement gap, the moving part 2 abuts against the limiting part to restrict further movement of the moving part 2 in the plane. For example, a limiting protrusion (or a separately installed limiting block) is integrally formed on the base 11. This limiting protrusion extends along the optical axis to form a long strip-shaped rib. A preset gap (e.g., 0.05mm-0.15mm) is maintained radially between the outer periphery of the moving part 2 and the limiting protrusion. This gap value is determined according to the maximum design stroke of the OIS. In this embodiment, when the OIS drive structure fails or the module suffers an extreme impact, the displacement of the moving part 2 in the XY plane may exceed the design allowable range. At this time, the outer periphery of the moving part 2 physically contacts (abuts) the limiting protrusion on the base 11, forming a hard limit and preventing further movement of the moving part 2.

[0063] Figure 7 This is a schematic diagram of the first and second drive structures of the drive motor provided in an embodiment of the present invention. Figure 8 Please refer to the schematic diagram of the drive magnet mounting structure of the drive motor provided in the embodiment of the present invention. Figure 2 , Figure 7 , Figure 8 The drive motor in this embodiment further includes a first drive structure and a second drive structure. The first drive structure is used to drive the moving part to move along a first linear direction, and the second drive structure is used to drive the moving part 2 to move in a plane perpendicular to the first linear direction. In this embodiment, the first drive structure is an AF drive structure, and the second drive structure is an OIS drive structure.

[0064] Optionally, the first driving structure in this embodiment is an electromagnetic driving assembly, including a first driving magnet 4 disposed on the moving part 2 and a focusing coil 5 disposed on the fixed part 1. The second driving structure is an electromagnetic driving assembly, including a second driving magnet 6 disposed on the moving part 2 and an image stabilization coil 7 disposed on the fixed part 1, the image stabilization coil 7 being symmetrically arranged along the circumferential direction. In this embodiment, the first driving structure and the second driving structure share the same driving magnet disposed on the moving part 2, that is, the first driving magnet 4 and the second driving magnet 6 are the same driving magnet (see...). Figure 2 and Figure 74 (6)). Specifically, in this embodiment, the moving part 2 is provided with a driving magnet mounting groove 22, and the driving magnet is fixed by glue. The moving part 2 is also provided with a glue storage groove 23. The first driving magnet 4 in this embodiment is an annular magnet. The first driving magnet 4 has a pre-set glue-locking hole. After the magnet in this embodiment is installed, the glue in the glue-locking hole and the glue in the glue storage groove 23 are fused and solidified, resulting in a stronger bonding force and a more secure fixation of the first driving magnet 4. The focusing coil 5 is an annular hollow coil, fixed on the base 11, and magnetically coupled to the first driving magnet 4 in the Z-axis direction. Four image stabilization coils 7 are fixed at the four corners of the base 11 and magnetically coupled to the first driving magnet 4 in the XY plane. All coils are electrically connected to an external driving chip via a flexible circuit board (FPC). Current is supplied to the focusing coil 5 fixed on the base 11. The focusing coil 5 experiences a Lorentz force in the magnetic field of the first driving magnet 4 located on the moving part 2. Since the focusing coil 5 is fixed to the base 11, this force acts on the fixed part, and the first driving magnet 4 experiences an equal and opposite reaction force. This reaction force drives the moving part 2, on which the first driving magnet 4 is fixed, to move along the Z-axis. The direction of the current determines the direction of the force (up / down), and the magnitude of the current is proportional to the force, thereby achieving focus control. When current is supplied to the image stabilization coil 7, the image stabilization coil 7 experiences a Lorentz force in the XY plane in the magnetic field of the second driving magnet 6, which reacts on the moving part 2, pushing the moving part 2 to move in the XY plane. The four image stabilization coils 7 can be independently controlled as needed to achieve multi-degree-of-freedom drive of X-axis, Y-axis and θz rotation. Of course, in other embodiments, the first driving magnet 4 of the first driving structure can be set on the fixed part 1, the focusing coil 5 can be set on the moving part 2, the second driving magnet 6 of the second driving structure can be set on the fixed part 1, and the image stabilization coil 7 can be set on the moving part 2.

[0065] In this embodiment, the AF drive and OIS drive share the same set of permanent magnets, eliminating the need to configure magnets separately for the OIS drive, thus reducing material costs and module size.

[0066] Figure 9 This is an exploded view of the drive motor provided in an embodiment of the present invention. Figure 10 Please refer to the schematic diagram of a partial structure of the drive motor provided in an embodiment of the present invention. Figure 9 and Figure 10 Optionally, the first driving structure includes a shape memory alloy spring 8 (SMA spring), one end of which is fixed to the outer shell, and the other end of which is fixed to the moving part 2. In this embodiment, the first driving structure uses an SMA spring. The driving force of the SMA spring originates from a solid-state phase change rather than electromagnetic induction, eliminating the need for a magnetic shield, saving space and cost. In multi-camera modules, there is no magnetic crosstalk between adjacent cameras. In this embodiment, the SMA spring is powered through the spring contact 81 terminals mounted on the base 11 and the moving part 2.

[0067] In one specific embodiment, the drive motor further includes at least one temperature-sensitive thermistor 82, which is disposed on the moving part 2 or the fixed part 1 and thermally coupled to the SMA spring. The temperature-sensitive thermistor 82 is used to detect the temperature of the SMA spring and output a corresponding electrical signal. For example, the temperature-sensitive thermistor 82 detects the actual temperature of the SMA spring in real time. The control circuit dynamically adjusts the drive current according to the temperature signal. When the ambient temperature is high, the drive current is reduced to prevent overshoot; when the ambient temperature is low, the drive current is increased to compensate for response delay. Regardless of changes in the external ambient temperature, the lens focus position and image stabilization response remain consistent, providing a stable and reliable user experience. When multiple SMA springs (e.g., four) are used for driving, the heat dissipation conditions and initial temperatures of each spring may differ, resulting in inconsistent contraction amounts under the same current, affecting motion accuracy. In this case, an independent temperature-sensitive thermistor 82 can be configured for each SMA spring (or each group of SMA springs). The control circuit independently adjusts the drive current of each path according to the temperature differences of each spring, ensuring the accuracy of synchronous or differential contraction of multiple SMA springs.

[0068] In one specific embodiment, the number of shape memory alloy springs 8 is four, and the four shape memory alloy springs 8 are distributed in a cross-shaped symmetrical arrangement or a rectangular four-corner arrangement. The four shape memory alloy springs 8 in this embodiment are distributed in a cross-shaped symmetrical arrangement or a rectangular four-corner arrangement, which can ensure uniform distribution of driving force and improve stability.

[0069] In one specific embodiment, the shape memory alloy spring 8 includes a first set of springs and a second set of springs symmetrically arranged along the optical axis of the optical lens; the first set of springs is powered by a first driving circuit, and the second set of springs is powered by a second driving circuit; the first and second driving circuits are configured to simultaneously output the same driving current to reduce the response delay of the moving part 2 moving along the optical axis; or, the first and second driving circuits are configured to output different driving currents respectively to cause the moving part 2 to tilt. This embodiment uses four SMA springs as focusing driving elements, arranged symmetrically in a cross shape around the moving part 2, meaning there are two of each first and second set of springs in this embodiment. When the SMA springs are energized, they contract and pull the moving part 2 towards the fixed end; when the SMA springs are de-energized, they extend, and the moving part 2 returns to its original position under the action of a reset element. Exemplarily, the first and second sets of springs are energized with the same current and contract synchronously, causing the moving part 2 to rise smoothly along the Z-axis, and then synchronously reset after de-energization. The first and second sets of springs are supplied with different currents, causing them to contract at different rates. This results in the moving part 2 exhibiting a tilting motion around the X or Y axis. For example, when a mobile phone is taking a picture while tilted, the magnitude of the current can be used to control the lens for angle compensation, making the captured image more accurate.

[0070] Further, please refer to Figure 9 The drive motor also includes a reset element 9, which is configured to provide a restoring force to the moving part 2 towards its initial position. Exemplarily, the reset element 9 includes a magnetic attracting plate disposed on the base 11, for magnetically interacting with a magnetic or conductive part disposed on the moving part 2. In this embodiment, a soft magnetic material sheet is embedded in the base 11, and a permanent magnet is embedded in the bottom of the moving part 2. The soft magnetic sheet and the permanent magnet form a magnetic attraction force in the Z-axis direction. When the SMA spring is energized and contracts, it overcomes the magnetic attraction force and pulls the moving part 2 upward. After the power is turned off, the magnetic attraction force acts as a restoring force, pulling the moving part 2 back to its initial position. Please refer to [link to relevant documentation]. Figure 2 The first driving magnet 4 on the moving part 2 and the reset element 9 on the base 11 form a magnetic attraction in the Z-axis direction. The reset element 9 in this embodiment is free from mechanical fatigue and plastic deformation, and has an extremely long lifespan. In the power-off state, the magnetic attraction can stably attract the moving part 2 to the initial position, resisting gravity and slight impacts, without the need for continuous power supply.

[0071] A second aspect of the present invention provides a camera module including a drive motor as described in any of the above embodiments.

[0072] For example, drive motors include:

[0073] The fixing part includes a base and a housing disposed on the base;

[0074] A movable part for carrying an optical lens is movably mounted to the base, and the housing covers the outer periphery of the movable part;

[0075] The support assembly includes a shaft member and a first motion conversion member. The shaft member is mounted on the base, and the first motion conversion member is movably sleeved on the shaft member and connected to the moving part, allowing the moving part to move relative to the shaft member along a first linear direction via the first motion conversion member. When the moving part is driven to move in a plane perpendicular to the first linear direction, the moving part can drive the shaft member to move relative to the fixed part in the plane, where the first linear direction is parallel to the optical axis of the optical lens.

[0076] A third aspect of the present invention provides an electronic device including a drive motor as described in any of the preceding embodiments.

[0077] For example, drive motors include:

[0078] The fixing part includes a base and a housing disposed on the base;

[0079] A movable part for carrying an optical lens is movably mounted to the base, and the housing covers the outer periphery of the movable part;

[0080] The support assembly includes a shaft member and a first motion conversion member. The shaft member is mounted on the base, and the first motion conversion member is movably sleeved on the shaft member and connected to the moving part, allowing the moving part to move relative to the shaft member along a first linear direction via the first motion conversion member. When the moving part is driven to move in a plane perpendicular to the first linear direction, the moving part can drive the shaft member to move relative to the fixed part in the plane, where the first linear direction is parallel to the optical axis of the optical lens.

[0081] The electronic device in this embodiment includes a camera module. Traditional AF+OIS integrated motors in camera modules typically employ a stacked structure of "support + AF mover + upper spring + lower spring + multiple sets of ball bearings." The support carries the AF mover and enables OIS movement. The AF mover is suspended and supported on the support by the upper and lower springs. Multiple ball bearings are located at the bottom and top of the support to achieve low-friction movement. This approach requires at least four independent structural components: a support, an AF mover, an upper spring, and a lower spring, as well as at least 6-8 ball bearings. The drive motor of this invention, through an integrated support assembly of "moving part—first motion conversion component—shaft component," completely eliminates the three independent parts: the support, the upper spring, and the lower spring. Simultaneously, it significantly reduces the number of ball bearings. This significant reduction in the number of components lowers material costs, simplifies assembly processes, reduces cumulative tolerances, and improves product yield.

[0082] Existing OIS driving forces require a multi-stage transmission path through "fixed part—ball bearing—bracket—spring—AF mover—lens," resulting in gaps and friction at each mating interface, leading to motion lag and response delay. The AF driving force must overcome the elastic deformation resistance of the upper and lower springs, resulting in high power consumption and a risk of spring fatigue fracture. In this invention, the moving part of the drive motor is directly and rigidly connected to the optical lens, the AF driving force acts directly on the moving part, and the OIS driving force is directly transmitted through the shaft component, significantly shortening the kinematic chain. In traditional stacked structures, the bracket occupies a certain axial space, and the upper and lower springs need to reserve space for elastic deformation. This invention eliminates the bracket and springs, allowing the moving part to form a compact layout directly with the base and housing, reducing axial dimensions.

[0083] In the above description, the terms "an embodiment," "some embodiments," "example," "specific example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drive motor, characterized in that, include: The fixing part includes a base and a housing disposed on the base; A movable part for carrying an optical lens is movably mounted to the base, and the housing covers the outer periphery of the movable part; A support assembly includes a shaft member and a first motion conversion member. The shaft member is mounted on the base, and the first motion conversion member is movably sleeved on the shaft member and connected to the moving part, so as to allow the moving part to move relative to the shaft member in a first linear direction via the first motion conversion member. When the moving part is driven to move in a plane perpendicular to the first straight line direction, the moving part can drive the shaft member to move relative to the fixed part in the plane, and the first straight line direction is parallel to the optical axis direction of the optical lens.

2. The drive motor according to claim 1, characterized in that: The first motion conversion component includes a bearing, the inner ring of which is slidably engaged with the shaft component, and the outer ring of which is fixed to the moving part.

3. The drive motor according to claim 2, characterized in that: The movable part is provided with a mounting notch, and the outer ring of the bearing is at least partially accommodated within the mounting notch.

4. The drive motor according to claim 2, characterized in that: The bearing is a ball bearing; balls are provided between the outer ring and the inner ring of the bearing, and the balls are in rolling contact with the shaft component.

5. The drive motor according to claim 1, characterized in that: The support assembly further includes two second motion conversion elements, which are respectively disposed at both ends of the shaft member along the first straight direction and roll in contact with the fixed part, such that when the moving part is driven to move in a plane perpendicular to the first straight direction, the moving part can drive the second motion conversion elements to move relative to the fixed part in the plane.

6. The drive motor according to claim 5, characterized in that: The second motion conversion component is a ball bearing.

7. The drive motor according to claim 6, characterized in that: The shaft component includes a first part and a second part; one end of the first part is provided with a convex shaft section, and the outer circumference of the convex shaft section is provided with an external thread; one end of the second part is provided with a concave hole, and the inner wall of the concave hole is provided with an internal thread that mates with the external thread; the convex shaft section is screwed into the concave hole, so that the first part and the second part are coaxially and fixedly connected; the first part and the second part have the same diameter, and a smooth transition outer circumferential surface is formed at the connection.

8. The drive motor according to claim 7, characterized in that: The shaft member has recesses or mounting grooves at both ends for accommodating and retaining the balls.

9. The drive motor according to claim 8, characterized in that: The recess or mounting groove has a ball-and-socket structure, which forms a ball-and-socket fit with the ball.

10. The drive motor according to claim 1, characterized in that: It also includes a limiting part, which is disposed on the fixed part. There is a preset movement gap between the moving part and the limiting part in a plane perpendicular to the first straight line direction. When the displacement of the moving part in the plane reaches the movement gap, the moving part abuts against the limiting part to restrict the further movement of the moving part in the plane.

11. The drive motor according to any one of claims 1-10, characterized in that: The drive motor further includes a first drive structure and a second drive structure. The first drive structure is used to drive the moving part to move along the first straight line direction, and the second drive structure is used to drive the moving part to move in a plane perpendicular to the first straight line direction.

12. The drive motor according to claim 11, characterized in that: The first driving structure is an electromagnetic driving assembly, which includes a first driving magnet and a focusing coil. The first driving magnet is disposed on the moving part, and the focusing coil is disposed on the fixed part; or, the first driving magnet is disposed on the fixed part, and the focusing coil is disposed on the moving part.

13. The drive motor according to claim 12, characterized in that: The second driving structure is an electromagnetic driving assembly. The second driving structure includes a second driving magnet and an anti-shake coil. The second driving magnet is disposed on the moving part, and the anti-shake coil is disposed on the fixed part. Alternatively, the second driving magnet is disposed on the fixed part, and the anti-shake coil is disposed on the moving part. The anti-shake coil is arranged symmetrically along the circumferential direction.

14. The drive motor according to claim 13, characterized in that: The first driving structure and the second driving structure share the same driving magnet disposed on the moving part.

15. The drive motor according to claim 11, characterized in that: The first driving structure includes a shape memory alloy spring, one end of which is fixed to the outer shell, and the other end of which is fixed to the moving part.

16. The drive motor according to claim 15, characterized in that: It also includes at least one temperature-sensitive thermistor; the temperature-sensitive thermistor is disposed on the moving part or the fixed part and is thermally coupled to the shape memory alloy spring; the temperature-sensitive thermistor is used to detect the temperature of the shape memory alloy spring and output a corresponding electrical signal.

17. The drive motor according to claim 15, characterized in that: The number of shape memory alloy springs is four, and the four shape memory alloy springs are distributed in a cross-shaped symmetrical distribution or a rectangular four-corner distribution.

18. The drive motor according to claim 15, characterized in that: The shape memory alloy spring includes a first set of springs and a second set of springs symmetrical about the optical axis of the optical lens; the first set of springs is powered by a first driving circuit, and the second set of springs is powered by a second driving circuit. The first driving circuit and the second driving circuit are configured to simultaneously output the same driving current to reduce the response delay of the moving part moving along the optical axis; or, the first driving circuit and the second driving circuit are configured to output different driving currents respectively to cause the moving part to tilt.

19. The drive motor according to claim 11, characterized in that: It also includes a reset element configured to provide a restoring force to the moving part toward its initial position; The reset element includes a magnetic absorbing piece disposed on the base for magnetically engaging with a magnetic absorbing part disposed on the moving part.

20. A camera module, characterized in that, Includes the drive motor as described in any one of claims 1-19.

21. An electronic device, characterized in that, Includes the drive motor as described in any one of claims 1-19.

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