A motor driving mechanism, a camera module and an electronic device

Abstract

The application discloses a motor driving mechanism, a camera module and electronic equipment. The motor driving mechanism comprises a base, a guide shaft, a magnetic assembly and a first coil. The base is fixedly connected with a first lens group; the guide shaft is fixed on the base along an optical axis of the first lens group; the guide shaft is slidingly connected with a second lens group, and an optical axis of the second lens group coincides with the optical axis of the first lens group; the magnetic assembly is located at one end of the second lens group; the first coil is located on the base and opposite to the magnetic assembly; the first coil is configured to receive a driving signal, drive the magnetic assembly to move along the optical axis, drive the second lens group to slide relative to the guide shaft, and adjust the distance between the second lens group and the first lens group. Since the guide shaft has high manufacturing precision and high strength, the assembly deviation of the second lens group can be reduced, the optical axis deviation can be avoided, the size variation caused by the decay impact can be reduced, and the inclination and deviation of the second lens group can be prevented. By using the first coil and the magnetic assembly, the dynamic magnetic driving mode is adopted to control the sliding direction of the second lens group along the optical axis. By using a group of magnetic assemblies, magnetic adsorption and magnetic driving can be realized, so that the external magnetic interference can be reduced. Therefore, the motor driving mechanism provided by the application can improve the optical performance and the user experience.

Description

Technical Field

[0001] This application relates to the field of terminal equipment technology, and in particular to a motor drive mechanism, a camera module, and an electronic device. Background Technology

[0002] With the development of intelligent mobile terminals, integrating high-precision camera functions has become a standard requirement for electronic devices such as smartphones and tablets. To meet users' needs for high-definition imaging and multi-scene shooting (such as wide-angle, telephoto, and macro), electronic devices generally adopt camera module configurations, which achieve functions such as optical zoom and fast focusing through the coordinated work of lens groups with different focal lengths.

[0003] The driving mechanism of a camera module typically uses a motor as a power source, which drives the lens assembly to move along the optical axis through electromagnetic force, thereby achieving automatic focusing and optical zoom.

[0004] However, the assembly process of the motor and lens assembly requires extremely high precision. Even slight assembly deviations can cause optical axis misalignment, and during fading, it can easily lead to lens tilting or displacement. The magnets inside the motor are susceptible to interference from external magnetic fields, causing distortion of the drive signal and affecting the accuracy of lens assembly displacement control. Therefore, existing motors can easily lead to reduced optical performance of the camera module and a poor user experience. Summary of the Invention

[0005] This application provides a motor drive mechanism, a camera module, and an electronic device to solve the problem that existing motors are susceptible to magnetic interference, leading to reduced optical performance.

[0006] In a first aspect, this application provides a motor drive mechanism, comprising: a base, a guide shaft, a magnetic component, and a first coil. The base is fixedly connected to a first lens assembly; the guide shaft is fixed to the base along the optical axis of the first lens assembly; the guide shaft is slidably connected to a second lens assembly, the optical axis of the second lens assembly coinciding with the optical axis of the first lens assembly; the magnetic component is located at one end of the second lens assembly; the first coil is located on the base and opposite to the magnetic component; the first coil is configured to receive a drive signal, driving the magnetic component to move along the optical axis, thereby causing the second lens assembly to slide relative to the guide shaft, thus adjusting the distance between the second lens assembly and the first lens assembly.

[0007] The motor drive mechanism provided in this application embodiment uses a guide shaft to constrain the sliding of the second lens assembly along the optical axis. Because the guide shaft has high manufacturing precision and strength, it helps reduce assembly deviations of the second lens assembly, avoids optical axis misalignment, and also reduces dimensional variations caused by fading impacts, preventing tilting and displacement of the second lens assembly. Utilizing the action of the first coil and magnetic components, a moving magnet drive method is used to control the sliding direction of the second lens assembly along the optical axis, thereby achieving zooming or focusing of the lens assembly. A set of magnetic components enables both magnetic adsorption and magnetic drive, reducing external magnetic interference. Therefore, the motor drive mechanism provided in this application embodiment can improve optical performance and provide a better user experience.

[0008] In some implementations, the number of guide shafts includes two; the two guide shafts are spaced apart along a first direction and fixed to the base respectively, the first direction being perpendicular to the optical axis; the second lens group is connected to the two guide shafts and can slide relative to the two guide shafts. In this way, using two guide shafts to achieve the sliding of the second lens group allows the second lens group to slide more smoothly along the optical axis, thereby improving optical accuracy and reducing tilt and eccentricity.

[0009] In some implementations, the two opposite end faces of the base each include two positioning holes, and the two positioning holes on the same end face are spaced apart along a first direction; the two ends of the two guide shafts are correspondingly embedded in the four positioning holes. In this way, the two guide shafts can be fixed more stably.

[0010] In some implementations, the surface of the positioning hole includes at least two positioning facets that are tangent to the outer circumferential surface of the guide shaft. This positioning hole, with at least two positioning points tangential to the guide shaft, helps reduce the manufacturing difficulty of the base and improves the dimensional accuracy of the positioning hole, thereby improving the positioning accuracy, parallelism, and perpendicularity of the guide shaft.

[0011] In some implementations, a first sliding bracket is also included; the first sliding bracket is fixedly connected to the second lens assembly and slidably connected to the two guide axes along the optical axis. In this way, the second lens assembly can slide relative to the guide axes via the first sliding bracket.

[0012] In some implementations, the first sliding bracket includes a first slide groove and a second slide groove; the first slide groove covers one of the guide shafts, and the second slide groove covers the other guide shaft. Thus, by sliding the guide shafts within the first and second slide grooves, the second lens assembly can slide relative to the guide shafts.

[0013] In some implementations, the opening directions of both the first and second slide grooves are opposite to the magnetic component; the first slide groove is one of a V-groove and a U-groove, and the second slide groove is the other of a V-groove and a U-groove. By using slide grooves of different shapes, the first and second slide grooves can generate forces in different directions on the guide shaft when they contact it, thereby improving the assembly accuracy of the guide shaft with the corresponding first and second slide grooves and enhancing the reliability of the sliding connection.

[0014] In some implementations, the surface of the first sliding bracket facing the first coil includes a receiving groove into which the magnetic component is embedded. This allows the magnetic component to be positioned at one end of the second lens assembly, opposite the first coil.

[0015] In some implementations, a second coil is also included, opposite to the magnetic component; a guide shaft is also slidably connected to a third lens group, the third lens group being located on the side of the second lens group opposite to the first lens group; the second coil is located on the third lens group; the optical axis of the third lens group coincides with the optical axis of the first lens group; the second coil is configured to slide relative to the magnetic component along the optical axis after receiving a drive signal, thereby driving the third lens group to slide relative to the guide shaft, adjusting the distance between the third lens group and the second lens group. In this way, the second and third lens groups use the same set of magnetic components to achieve magnetic attraction and magnetic drive, reducing external magnetic interference and facilitating device layout within electronic devices. Since both the second and third lens groups are slidably connected to the same set of guide shafts, the sliding distance of the second and third lens groups can be precisely controlled, which helps reduce the cumulative assembly deviation of the two lens groups and the dimensional variation caused by fading impact, preventing lens group tilting and misalignment, avoiding optical performance degradation, and thus improving the optical accuracy of the second and third lens groups. Furthermore, the action of the second coil and the magnetic component can be used to control the sliding of the third lens group along the optical axis relative to the guide shaft using a moving-coil drive method.

[0016] In some implementations, a second sliding bracket is also included; the second sliding bracket is fixedly connected to the third lens group and slidably connected to the two guide axes along the optical axis. In this way, the second sliding bracket can be used to achieve sliding of the third lens group relative to the two guide axes along the optical axis.

[0017] In some implementations, the second sliding bracket includes a coil fixing plate and a magnetic steel block; the coil fixing plate is fixed to one end of the third lens assembly; the magnetic steel block and the second coil are spaced apart on the coil fixing plate, with the magnetic steel block facing the magnetic component. Thus, the magnetic attraction between the magnetic steel block and the magnetic component allows the third lens assembly to be attached to the guide shaft, facilitating stable sliding of the third lens assembly along the guide shaft.

[0018] In some implementations, the second sliding bracket further includes a steel insert fixed to one end of the third lens assembly; the steel insert includes a third slide groove and a fourth slide groove; the third slide groove covers one of the guide shafts, and the fourth slide groove covers the other guide shaft. Thus, by sliding the guide shafts within the third and fourth slide grooves, the third lens assembly can slide relative to the guide shafts.

[0019] In some implementations, the opening directions of both the third and fourth slide grooves are towards the magnetic component; the third slide groove is either a V-groove or a U-groove, and the fourth slide groove is either a V-groove or a U-groove. By using slide grooves of different shapes, the third and fourth slide grooves can generate forces in different directions on the guide shaft when they contact it, thereby improving the assembly accuracy of the guide shaft with the corresponding third and fourth slide grooves and enhancing the reliability of the sliding connection.

[0020] In some implementations, a buffer stop is also included; the buffer stop is sleeved on the outside of the first sliding bracket, and slides with the first sliding bracket; the buffer stop includes multiple blocking parts, each of which corresponds to and abuts against the opposite ends of the first sliding bracket, the opposite ends of the second lens group, and the end of the third lens group facing away from the second lens group. In this way, the blocking parts facilitate the buffer stop's movement with the first sliding bracket; improve the stability of the second lens group and the first sliding bracket, preventing misalignment that could affect sliding accuracy; and can also stop the third lens group, positioning it at the end of the first sliding bracket facing the light outlet, while allowing the third lens group to slide together with the second lens group.

[0021] In some implementations, a buffer sleeve is fitted onto each blocking part. This protects the first sliding bracket, the second lens group, and the third lens group from damage caused by impacts from the blocking parts during fading.

[0022] Some implementations also include a position feedback magnet, located on the third lens assembly. This allows the position feedback magnet to provide real-time feedback on the position of the third lens assembly, enabling closed-loop control.

[0023] In some implementations, an FPC circuit board is also included, located on a base; the first coil is electrically connected to the FPC circuit board. In this way, the FPC circuit board inputs a drive signal to the first coil to control the sliding direction of the second lens assembly.

[0024] In some implementations, the FPC circuit board includes a first magnetic field position detection element and a second magnetic field position detection element. The first magnetic field position detection element is positioned relative to the magnetic component and is used to detect the position of the second lens assembly. The second magnetic field position detection element is positioned relative to the position feedback magnet and is used to detect the position of the third lens assembly. Thus, the first magnetic field position detection element detects the real-time position of the second lens assembly by detecting changes in the position of the magnetic component, thereby achieving closed-loop control of the second lens assembly. The second magnetic field position detection element detects the real-time position of the third lens assembly by detecting changes in the position of the position feedback magnet, thereby achieving closed-loop control of the third lens assembly.

[0025] In some implementations, the base includes a base insert, one end of which is connected to a guide shaft and the other end to an FPC circuit board; the second coil is electrically connected to the FPC circuit board via a second sliding bracket, the guide shaft, and the base insert. This provides a way to electrically connect the second coil to the FPC circuit board, allowing the FPC circuit board to input a drive signal to the second coil to control the sliding direction of the third lens assembly.

[0026] Some implementations also include: a folded flexible circuit board; one end of the folded flexible circuit board is connected to the second coil, and the other end is connected to the FPC circuit board. This provides another way to achieve the electrical connection between the second coil and the FPC circuit board, allowing the FPC circuit board to input a drive signal to the second coil to control the sliding direction of the third lens assembly.

[0027] Secondly, this application provides a camera module, including: a first lens group, a second lens group, a third lens group, a photosensitive chip, and a motor drive mechanism as provided in the first aspect; the first lens group, the second lens group, and the third lens group are spaced apart on the motor drive mechanism; the photosensitive chip is located on the side of the motor drive mechanism adjacent to the third lens group; light passes through the first lens group, the second lens group, and the third lens group in sequence and is received by the photosensitive chip.

[0028] The camera module provided in this application includes a motor drive mechanism that uses a moving magnet drive method and a moving coil drive method to control the sliding direction of the second and third lens groups along the optical axis relative to the guide axis, thereby achieving zooming or focusing. This avoids optical axis misalignment and reduces dimensional variations caused by fading impacts, preventing tilting and misalignment of the second and third lens groups, thus avoiding optical performance degradation and improving optical accuracy. The second and third lens groups share the same set of magnetic components, enabling both magnetic adsorption and magnetic drive, reducing external magnetic interference. This not only improves the optical accuracy of the camera module but also reduces the space occupied by the camera module in the thickness direction of the electronic device, thereby enabling the development of thinner and lighter electronic devices.

[0029] Thirdly, this application provides an electronic device, including a display screen, a mid-frame, a rear shell, and a camera module as provided in the second aspect; the display screen and the rear shell are located on opposite sides of the mid-frame and connected to the mid-frame to form a whole-machine cavity; the camera module is located within the whole-machine cavity.

[0030] The electronic device provided in this application uses a camera module with high optical precision to improve the camera function of the electronic device. The camera module does not occupy space in the thickness direction of the electronic device, which enables the development of a thinner and lighter electronic device. Attached Figure Description

[0031] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of an electronic device;

[0033] Figure 2 It is a rear view of an electronic device;

[0034] Figure 3 This is a structural diagram of a camera component;

[0035] Figure 4 This is a schematic diagram of the external structure of the motor drive mechanism provided in the embodiments of this application;

[0036] Figure 5A This is a first exploded structural diagram of the motor drive mechanism provided in the embodiments of this application;

[0037] Figure 5B This is a second exploded structural diagram of the motor drive mechanism provided in the embodiments of this application;

[0038] Figure 6 This is a schematic diagram of the first internal structure of the motor drive mechanism provided in the embodiments of this application;

[0039] Figure 7 This is a side view of the base provided in an embodiment of this application;

[0040] Figure 8 This is a second internal structure schematic diagram of the motor drive mechanism provided in the embodiments of this application;

[0041] Figure 9 This is a schematic diagram of the first structure of the second lens assembly provided in the embodiments of this application;

[0042] Figure 10 This is a second structural schematic diagram of the second lens group provided in the embodiments of this application;

[0043] Figure 11 This is a schematic diagram of the connection between the first sliding bracket and the guide shaft provided in an embodiment of this application;

[0044] Figure 12 This is a third structural schematic diagram of the second lens group provided in the embodiments of this application;

[0045] Figure 13 This is a schematic diagram of the structure of the second lens group, guide shaft, magnetic assembly and first coil provided in the embodiments of this application;

[0046] Figure 14 This is a first schematic diagram of the current and magnetic field of the motor drive mechanism provided in the embodiments of this application;

[0047] Figure 15 This is a third internal structure schematic diagram of the motor drive mechanism provided in the embodiments of this application;

[0048] Figure 16A This is a schematic diagram of the fourth internal structure of the motor drive mechanism provided in the embodiments of this application;

[0049] Figure 16B yes Figure 16A An exploded view of the provided motor drive mechanism;

[0050] Figure 17A This is a schematic diagram of the structure of the third lens group and the second sliding bracket provided in the embodiments of this application;

[0051] Figure 17B This is an exploded structural diagram of the third lens group and the second sliding bracket provided in the embodiments of this application;

[0052] Figure 18 yes Figure 15 Schematic diagram of section AA;

[0053] Figure 19 yes Figure 15 Schematic diagram of the structure at section BB;

[0054] Figure 20 This is a first side view of the motor drive mechanism provided in the embodiments of this application;

[0055] Figure 21 This is a second side view of the motor drive mechanism provided in the embodiments of this application;

[0056] Figure 22 This is a second schematic diagram of the current and magnetic field of the motor drive mechanism provided in the embodiments of this application;

[0057] Figure 23 This is a schematic diagram of the structure of the FPC circuit board provided in the embodiments of this application;

[0058] Figure 24 This is a schematic diagram of the bottom structure of the motor drive mechanism provided in the embodiments of this application;

[0059] Figure 25 This is a schematic diagram showing the positions of the magnetic field position detection element and the magnet provided in the embodiments of this application;

[0060] Figure 26A This is a schematic diagram of the fourth internal structure of the motor drive mechanism provided in the embodiments of this application;

[0061] Figure 26B This is a fifth internal structure schematic diagram of the motor drive mechanism provided in the embodiments of this application;

[0062] Figure 27A This is a schematic diagram of the structure of the camera module provided in the embodiments of this application;

[0063] Figure 27B This is an exploded view of the camera module provided in an embodiment of this application;

[0064] Figure 28 This is a rear view of the electronic device provided in the embodiments of this application.

[0065] Illustration:

[0066] 10-Display screen, 20-Mid-frame, 30-Back cover, 40-Camera assembly, 41-Lens assembly, 42-Motor, 43-Base, 44-Circuit board;

[0067] 50-Camera module;

[0068] 100a - outer shell, 100 - base, 101 - positioning hole, 1011 - positioning facet, 102 - base insert, 103 - light inlet, 104 - light outlet;

[0069] 200-guide shaft;

[0070] 300 - Magnetic components;

[0071] 401 - First coil, 402 - Second coil, 4021 - Positive terminal, 4022 - Negative terminal;

[0072] 500 - First sliding bracket, 501 - First sliding groove, 502 - Second sliding groove, 503 - Receiving groove;

[0073] 600-Second sliding bracket, 601-Coil fixing plate, 602-Magnetic steel block, 603-Steel sheet insert, 6031-Third sliding groove, 6032-Fourth sliding groove;

[0074] 700-Buffer stop, 701-Blocking part, 702-Buffer sleeve;

[0075] 801 - Position feedback magnet, 802 - FPC circuit board, 802a - Extension, 8021 - First magnetic field position detection element, 8022 - Second magnetic field position detection element, 803 - Folded flexible circuit board;

[0076] 901-First lens group, 902-Second lens group, 903-Third lens group, 904-Photosensitive chip, 905-Motor drive mechanism, 906-Prism, 9061-Prism mount, 907-Main circuit board. Detailed Implementation

[0077] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the protection scope of this application.

[0078] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0079] Furthermore, in this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the indicated placement of the components in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the placement of the components in the accompanying drawings.

[0080] The following explanations of the technical terms mentioned in the embodiments of this application are provided to facilitate understanding by those skilled in the art.

[0081] Optical zoom changes the focal length and angle of view by moving the relative positions of the lens elements within the lens, thus magnifying or reducing the image. Achieving optical zoom requires at least one fixed lens group (for basic imaging or correction) and at least two movable lens groups (for zooming and focusing). The two movable lens groups adjust the focal length, while the fixed lens group assists in stabilizing the optical path.

[0082] Optical focusing refers to adjusting the position of the entire lens assembly relative to the image sensor (rather than the positions of individual lens groups within the lens assembly) to control the image distance, thereby achieving the sharpest image. Achieving optical focusing requires at least one fixed lens group (for basic imaging or correction) and at least one movable lens group (for focusing). Autofocus is achieved by controlling the movement of the movable lens group, while the fixed lens group works together to focus light and correct aberrations.

[0083] The electronic devices described in this application include, but are not limited to, mobile phones, laptops, tablets, personal digital assistants, or wearable devices. The following description uses a mobile phone as an example.

[0084] Figure 1 This is a schematic diagram of the structure of an electronic device; Figure 2 This is a rear view of an electronic device.

[0085] like Figure 1 and Figure 2 As shown, the electronic device may include a display screen 10, a mid-frame 20, and a rear cover 30. The display screen 10 and the rear cover are located on opposite sides of the mid-frame 20. The display screen 10, mid-frame 20, and rear cover 30 are sequentially fastened together to form a complete device cavity. The complete device cavity includes components such as a communication module, circuit board, battery, speaker assembly, and camera assembly 40, which are not listed here.

[0086] The camera assembly 40 can provide shooting functionality for electronic devices. The camera assembly 40 can function as either a front-facing camera or a rear-facing camera. This embodiment is described using the rear-facing camera as an example. The lens of the camera assembly 40 is exposed on the surface of the electronic device, and images are captured and shot during shooting.

[0087] To facilitate the explanation of the positions of various components in the electronic device, this application embodiment exemplarily establishes a three-dimensional coordinate system based on the electronic device, wherein the x-axis direction is the width direction of the electronic device, the y-axis direction is the length direction of the electronic device, and the z-axis direction is the thickness direction of the electronic device.

[0088] Figure 3 This is a structural diagram of a camera component.

[0089] like Figure 3 As shown, the camera assembly 40 includes a lens assembly 41, a motor 42, a filter (not shown), a photosensitive chip (not shown), a base 43, and a circuit board 44. The lens assembly 41 includes a lens barrel and a lens fixed inside the lens barrel.

[0090] The motor 42 is fixedly connected to the lens assembly 41 and is mounted on the light-emitting side of the lens assembly 41. The lens assembly 41 can move along the optical axis Z0 under the drive of the motor 42 to achieve optical focusing and zooming.

[0091] The base 43 supports the motor 42, which is connected to the base 43 via an adhesive layer. The filter and photosensitive chip are sequentially fixed within the base 43. The filter is adjacent to the lens assembly 41, while the photosensitive chip faces away from the lens assembly 41. The filter is perpendicular to the optical axis, allowing external light to pass through the lens assembly 41 and reach the filter, which blocks infrared light to prevent interference with color reproduction. The light-receiving surface of the photosensitive chip faces the lens assembly 41. After passing through the lens assembly 41 and the filter, light illuminates the light-receiving surface. The photosensitive chip utilizes the photoelectric conversion function of photoelectric devices to convert the light image on its light-receiving surface into an electrical signal proportional to the light image, thus forming an image.

[0092] Circuit board 44 is fixed to the side of base 43 opposite to motor 42, with circuit board 44 and motor 42 located on opposite sides of base 43. Circuit board 44 may include a rigid circuit board and a flexible circuit board connected together. A photosensitive chip may be arranged on the rigid circuit board, and the photosensitive chip is electrically connected to the rigid circuit board via metal wires. A connector (not shown in the figure) may be arranged on the end of the flexible circuit board away from the rigid circuit board, through which the camera assembly 40 is connected to the motherboard of the electronic device.

[0093] To meet users' demands for high-definition imaging and multi-scene shooting (such as wide-angle, telephoto, and macro), the lens assembly 41 typically employs a configuration of multiple lens groups. These lens groups achieve functions such as optical zoom and fast focusing through the coordinated work of lenses with different focal lengths. Their performance is highly dependent on the precise drive and control of the motor 42 in the camera assembly. Therefore, the stability and precision of the motor 42 in the camera assembly directly affect the image quality, becoming a key aspect of upgrading the camera technology of electronic devices.

[0094] Currently, motor 42 typically uses a micro motor (such as a voice coil motor, VCM) as its power source. It drives each lens assembly to move along the optical axis Z0 via electromagnetic force, thereby achieving autofocus and optical zoom. Specifically, motor 42 usually includes coils, magnets, springs, and position sensors. During operation, it adjusts the magnetic field strength by using current to control the displacement of the lens assembly. This structure needs to achieve high-precision displacement feedback within a limited space while ensuring the coaxiality between the lens assembly and the image sensor to guarantee optical path stability.

[0095] However, traditional motor-driven solutions suffer from several technical bottlenecks: First, the assembly process of the motor 42 and each lens assembly requires extremely high precision; even slight assembly deviations can lead to optical axis misalignment, resulting in blurred images or edge distortion. Second, after prolonged use, the spring contacts are prone to fatigue deformation or impact from decay, both of which can easily cause the lens assembly to tilt or shift, leading to a decline in optical performance, such as reduced focusing reliability. Third, different lens assemblies are driven by corresponding different magnets, and the multiple magnetic fields generated are prone to mutual interference. Furthermore, the internal magnets of the motor 42 are susceptible to interference from external magnetic fields (such as wireless charging modules), causing distortion of the drive signal and affecting the accuracy of displacement control. These problems have become the core obstacles restricting the performance improvement of the camera component 40 in electronic devices.

[0096] To address the aforementioned technical problems, this application provides a motor drive mechanism and a camera module, which can improve the optical accuracy of multiple lens groups and reduce tilt and eccentricity. Each lens group shares the same set of magnets to achieve magnetic adsorption and magnetic drive, thereby reducing external magnetic interference and facilitating the layout of components within the mobile phone.

[0097] Figure 4 This is a schematic diagram of the external structure of the motor drive mechanism provided in the embodiments of this application; Figure 5A This is a first exploded structural diagram of the motor drive mechanism provided in the embodiments of this application; Figure 5B This is a second exploded structural diagram of the motor drive mechanism provided in an embodiment of this application. Wherein, Figure 5A and Figure 5B The decomposition structure is shown from different perspectives.

[0098] like Figure 4 , Figure 5A and Figure 5B As shown, in some embodiments, the motor drive mechanism 905 provided in this application may include: a housing 100a, a base 100, a guide shaft 200, a magnetic component 300, and a first coil 401, etc.

[0099] The outer shell 100a is fastened to the base 100 to form a receiving cavity (not shown in the figure).

[0100] The motor drive mechanism 905 is used to drive the lens assembly in the camera module. The lens assembly, guide shaft 200, magnetic component 300, and first coil 401 are located in the receiving cavity. The lens assembly includes a first lens assembly 901, a second lens assembly 902, and a third lens assembly 903.

[0101] The first lens group 901, the second lens group 902, and the third lens group 903 each include multiple lenses. The optical axes Z0 of these multiple lenses coincide to form the corresponding lens groups, thereby achieving better optical performance. Specifically, the optical axis Z0 passes through the central axis of each lens in each lens group and is parallel to the x-axis.

[0102] Figure 6 This is a schematic diagram of the first internal structure of the motor drive mechanism provided in an embodiment of this application. Wherein, Figure 6 The structure of the second lens group 902 and the third lens group 903 is not shown in the figure.

[0103] like Figure 6 As shown, in some embodiments, the base 100 includes an inlet 103 and an outlet 104, which are located on opposite end faces of the base 100, and the end faces are perpendicular to the optical axis Z0.

[0104] The first lens assembly 901 is located within the receiving cavity and is fixed to the end face of the base 100. The first lens assembly 901 can be fixed by means of adhesive or welding.

[0105] The light-incident surface (not shown in the figure) of the first lens group 901 is exposed through the light-incident port 103, so that external light enters the first lens group 901 through the light-incident surface and continues to propagate along the optical axis Z0. The optical axis Z0 of the first lens group 901 is parallel to the center line of the light-incident port 103 and the light-outcident port 104.

[0106] The guide shaft 200 is fixed to the base 100 along the optical axis Z0 of the first lens group 901, and the fixing method can be adhesive or welding. The length direction of the guide shaft 200 is parallel to the optical axis Z0 and also parallel to the x-axis; both ends of the guide shaft 200 are fixed to the end face of the base 100 with the light inlet 103 and the light outlet 104. The guide shaft 200 is used to constrain the direction of movement and prevent lateral displacement of the device moving along it.

[0107] The number of guide shafts 200 may include two; the two guide shafts 200 are spaced apart along the first direction and are respectively fixed on the base 100; wherein, the first direction is perpendicular to the optical axis Z0 and parallel to the z-axis direction.

[0108] In this way, by using two guide shafts 200 to slide the second lens group 902, the second lens group 902 can slide more smoothly along the optical axis, thereby improving optical accuracy.

[0109] Figure 7 This is a side view of the base provided in an embodiment of this application.

[0110] like Figure 7In some embodiments, the base 100 shown in the side view (a) has two positioning holes 101 on each of its two opposite end faces, and the two positioning holes 101 on the same end face are spaced apart along a first direction. For example, the end face of the light inlet 103 of the base 100 includes two positioning holes 101, which are spaced apart along the z-axis; the end face of the light outlet 104 of the base 100 also includes two positioning holes 101, which are spaced apart along the z-axis. The distance between the two positioning holes 101 on the same end face is equal to the distance between the two guide shafts 200.

[0111] The two ends of the two guide shafts 200 are each inserted into one of the four positioning holes 101. For example, the two ends of the upper guide shaft 200 are each inserted into the two upper positioning holes 101 in the z-axis direction, and the two ends of the lower guide shaft 200 are each inserted into the two lower positioning holes 101 in the z-axis direction. This allows the two guide shafts to be fixed more stably.

[0112] The surface of the positioning hole 101 includes at least two positioning facets 1011, which can be connected or spaced apart. That is, the surface of the positioning hole 101 is not circular, but has an irregular shape.

[0113] like Figure 7 In some embodiments of the partial structure connecting the guide shaft 200 and the base 100 shown in (b), when the end of the guide shaft 200 is embedded in the positioning hole 101, the positioning cut surface 1011 is tangent to the outer circumferential surface of the guide shaft 200, forming positioning points a1 and a2.

[0114] In this way, the positioning hole 101 is positioned tangentially to the guide shaft 200 by at least two positioning points a1 and a2, which helps to reduce the manufacturing difficulty of the base 100 and improve the dimensional accuracy of the positioning hole 101. This can improve the positioning accuracy, parallelism and perpendicularity of the guide shaft 200.

[0115] Figure 8 This is a second internal structure schematic diagram of the motor drive mechanism provided in an embodiment of this application. Wherein, Figure 8 The structure of the third lens group 903 is not shown in the diagram.

[0116] like Figure 8 As shown, in some embodiments, the guide shaft 200 is slidably connected to the second lens group 902, the second lens group 902 is connected to the two guide shafts 200, and can slide relative to the two guide shafts 200 along the optical axis Z0 direction.

[0117] The guide shaft 200 is a standard part with high manufacturing precision. The outer circumferential surface of the guide shaft 200 is smooth, which can accurately control the sliding distance of the second lens group 902, thereby improving the optical accuracy of the second lens group 902 and reducing tilt and eccentricity.

[0118] The second lens group 902 is located within the receiving cavity of the base 100 and is positioned to one side of the first lens group 901 along the optical axis Z0, with the optical axis Z0 of the second lens group 902 coinciding with that of the first lens group 901. A certain distance is maintained between the second lens group 902 and the first lens group 901, so that when the second lens group 902 slides along the optical axis Z0, the distance between the second lens group 902 and the first lens group 901 changes, thereby achieving zoom or focus.

[0119] To facilitate installation, after fixing the first lens group 901 to the base 100, the second lens group 902 is first placed in the receiving cavity of the base 100, and then the two guide shafts 200 are sequentially inserted into the positioning hole 101 and the connection part of the second lens group 902.

[0120] Figure 9 This is a schematic diagram of the first structure of the second lens group provided in the embodiments of this application.

[0121] like Figure 9 As shown, in some embodiments, the motor drive mechanism may further include: a first sliding bracket 500; the first sliding bracket 500 is fixedly connected to the second lens group 902 and slidably connected to the two guide shafts 200 along the optical axis Z0 direction.

[0122] In this way, the second lens group 902 can slide relative to the guide shaft 200 through the first sliding bracket 500.

[0123] Figure 10 This is a second structural schematic diagram of the second lens group provided in the embodiments of this application.

[0124] Combination Figure 9 and Figure 10 As shown, in some embodiments, the surface of the first sliding bracket 500 that fixes the second lens assembly 902 includes a first sliding groove 501 and a second sliding groove 502. The first sliding groove 501 and the second sliding groove 502 are spaced apart along the z-axis direction, and the length direction of the first sliding groove 501 and the length direction of the second sliding groove 502 are both along the x-axis direction.

[0125] The first groove 501 is one of a V-groove and a U-groove, and the second groove 502 is the other of a V-groove and a U-groove. The opening direction of the first groove 501 and the opening direction of the second groove 502 are both towards the second lens group 902. For example, the first groove 501 is a U-groove and the second groove 502 is a V-groove.

[0126] Figure 11 This is a schematic diagram of the connection between the first sliding bracket and the guide shaft provided in the embodiment of this application.

[0127] like Figure 11 As shown, in some embodiments, the first groove 501 and the second groove 502 correspond one-to-one with two guide shafts 200, one of which passes through the first groove 501 and is covered by the first groove 501; the other guide shaft 200 passes through the second groove 502 and is covered by the second groove 502.

[0128] When installing the second lens assembly 902 and the guide shaft 200, the lens assembly 902 contacts and engages with the guide shaft 200 via a V-groove and a U-groove. The U-groove engages with one guide shaft 200, and the V-groove engages with the other. The U-groove (first sliding groove 501) and the guide shaft 200 can form a tangent point b1, allowing the U-groove to abut against the guide shaft 200 in the y-axis direction, preventing misalignment of the guide shaft 200 in the y-axis direction. The V-groove (second sliding groove 502) and the guide shaft 200 can form two tangent points b2 and b3, allowing the V-groove to frame the guide shaft 200, preventing misalignment of the guide shaft 200 in the z-axis direction.

[0129] In this way, the first slide groove 501 and the second slide groove 502 adopt slide grooves of different shapes, which can generate forces in different directions on the guide shaft 200 when the first slide groove 501 and the second slide groove 502 are in contact with the guide shaft 200, so as to improve the assembly accuracy of the guide shaft 200 and the corresponding first slide groove 501 and the second slide groove 502, and improve the reliability of the sliding connection, thereby enabling the second lens group 902 to slide smoothly on the two guide shafts 200.

[0130] In other embodiments, the first groove 501 and the second groove 502 may also be grooves of the same shape, which is not limited here.

[0131] Figure 12 This is a third structural schematic diagram of the second lens group provided in the embodiments of this application.

[0132] like Figure 12 As shown, in some embodiments, the magnetic component 300 is used to generate a magnetic field that controls the sliding of the second lens group 902 and the third lens group 903.

[0133] The magnetic component 300 may consist of two magnets (not shown in the figure) arranged side by side with opposite polarities. Alternatively, the magnetic component 300 may also consist of a single magnetic block with a non-magnetic region in the middle and the polarities of the portions on either side of the non-magnetic region being opposite.

[0134] For example, the polarity distribution of the left side of the magnetic component 300 is N inside and S outside, forming an N→S magnetic field from the inside to the outside; the polarity distribution of the right side is S inside and N outside, forming an N→S magnetic field from the outside to the inside.

[0135] In this way, magnetic fields of different directions can be generated in different parts of the magnetic component 300, so as to control the sliding direction of the second lens group 902 and the third lens group 903 under magnetic fields of different directions.

[0136] Combination Figure 10 , Figure 11 and Figure 12 As shown, in some embodiments, the surface of the first sliding bracket 500 facing away from the second lens group 902 includes a receiving groove 503, and the magnetic component 300 is embedded in the receiving groove 503 to place the magnetic component 300 at one end of the second lens group 902.

[0137] The opening direction of the first slide groove 501 and the opening direction of the second slide groove 502 are both away from the magnetic component 300. In this way, the body of the first sliding bracket 500 can be located between the magnetic component 300 and the guide shaft 200 located in the first slide groove 501 and the second slide groove 502.

[0138] For example, both guide shafts 200 can be made of magnetic material and have magnetic attraction with the magnetic component 300. In this way, the first sliding bracket 500 can be attracted between the magnetic component 300 and the guide shaft 200, thereby attracting the second lens assembly 902 to the two guide shafts 200, so that it can be attached to the guide shafts 200 and slide along the guide shafts 200.

[0139] Lubricating grease can also be applied between the guide shaft 200 and the corresponding slide grooves (first slide groove 501 and second slide groove 502) to reduce the coefficient of friction, thereby improving the accuracy of the second lens group 902 sliding along the guide shaft 200.

[0140] Figure 13 This is a schematic diagram of the structure of the second lens group, guide shaft, magnetic components and first coil provided in the embodiments of this application.

[0141] Combination Figure 8 and Figure 13 As shown, in some embodiments, the first coil 401 is located on one end face of the base 100, which is connected to the end face where the light inlet 103 is located and the end face where the light outlet 104 is located.

[0142] The first coil 401 is opposite to the magnetic component 300. The first coil 401 is opposite to a part of the magnetic component 300, and the magnetic field of the first coil 401 and that part controls the sliding of the second lens assembly 902; after sliding, the first coil 401 is opposite to another part of the magnetic component 300, and the magnetic field of the first coil 401 and that other part controls the second lens assembly 902 to slide in the opposite direction.

[0143] In some embodiments, the motor drive mechanism may further include: an FPC circuit board 802 located on the base 100; for example, the FPC circuit board 802 and the first coil 401 are located on the same end face of the base 100.

[0144] The first coil 401 is formed in a ring-shaped winding manner. The first coil 401 is electrically connected to the FPC circuit board 802, which is used to input a drive signal to the first coil 401. For example, the drive signal is a current signal. Figure 13 The arrow on the first coil 401 indicates that the direction of the current signal is clockwise.

[0145] Figure 14 This is a first schematic diagram of the current and magnetic field of the motor drive mechanism provided in this application embodiment. Wherein, Figure 14 Show Figure 8 The cross-sectional structure along the x-axis. Figure 14 The cross-sectional profiles of the magnetic component 300 and the first coil 401 are not shown to indicate the direction and polarity of the current; ⊙ indicates that the current direction is perpendicular to the paper and outwards. This indicates that the direction of the current is perpendicular to the paper and inwards.

[0146] like Figure 14 As shown, in some embodiments, the second lens assembly 902 employs a moving magnet drive method. The moving magnet drive principle includes: a fixed coil interacting with a movable magnet. When the coil is energized, it generates a magnetic field, which couples with the magnetic field of the movable magnet (usually connected to the lens assembly). By changing the direction or magnitude of the current, the displacement of the magnet is controlled, thereby driving the lens to move.

[0147] In this embodiment, the moving part of the moving magnetic drive includes a magnetic component 300 and a second lens group 902, which are fixedly connected by a first sliding bracket 500 and move together; the fixed part includes a first coil 401 fixed on the base 100 and does not participate in the movement.

[0148] The first coil 401 is configured to receive a drive signal to drive the magnetic component 300 to move along the optical axis, thereby causing the second lens group 902 to slide relative to the guide shaft 200 to adjust the distance between the second lens group 902 and the first lens group 901.

[0149] The current I1 input from the FPC circuit board 802 to the first coil 401 is in the direction of right-in and left-out. The polarity of the left side of the magnetic component 300 is N at the top and S at the bottom, forming an N→S magnetic field from top to bottom; the polarity of the right side is S at the top and N at the bottom, forming an N→S magnetic field from bottom to top.

[0150] When a current I1 is passed through the first coil 401, a Lorentz force is generated. According to Fleming's left-hand rule, the direction of the Lorentz force generated by the first coil 401 is to the right. The principle of Fleming's left-hand rule includes: the left hand is outstretched, with the palm facing the direction of the magnetic field (N→S); the four fingers point in the direction of the current (the direction of positive charge flow); and the thumb points in the direction of the force on the conductor.

[0151] Since the first coil 401 is fixed on the base 100, according to Newton's third law, the magnetic component 300 is subjected to a reaction force from the first coil 401, and the reaction force is directed to the left. This causes the magnetic component 300 and the second lens group 902 to be subjected to a Lorentz force to the left, thereby causing the second lens group 902 to move to the left along the guide shaft 200, that is, to move towards the first lens group 901.

[0152] When a left-in, right-out current I1' (not shown in the figure) is passed through the first coil 401, the Lorentz force generated on the first coil 401 is directed to the left. The magnetic component 300 experiences a reaction force from the first coil 401 to the right, thereby causing the second lens assembly 902 to move to the right along the guide shaft 200, that is, to move in a direction away from the first lens assembly 901. The currents I1 and I1' have opposite directions.

[0153] Depending on the actual application, under the action of current I1 and / or I1', the second lens group 902 is controlled to move along the optical axis Z0 to adjust its image distance with the photosensitive chip in the camera module, so as to achieve automatic focus and make the image clear, or to adjust the distance between the lens groups to increase or decrease the focal length, so as to magnify or reduce the image.

[0154] It should be noted that the second lens group 902 can slide within the sliding stroke L1, thereby achieving corresponding optical zoom and focus. Here, the sliding stroke L1 is the distance between the end of the first sliding bracket 500 facing the light outlet 104 and the end face of the base 100 where the light outlet 103 is located.

[0155] The motor drive mechanism provided in this application embodiment uses a guide shaft 200 to constrain the sliding of the second lens group 902 along the optical axis. Because the guide shaft 200 has high manufacturing precision and strength, it helps reduce assembly deviations of the second lens group 902, avoids optical axis misalignment, and also reduces dimensional variations caused by fading impacts, preventing tilting and misalignment of the second lens group 902, thereby avoiding optical performance degradation. Utilizing the first coil 401 and the magnetic component 300, a moving magnet drive method is used to control the sliding direction of the second lens group 902 along the optical axis, thereby achieving zooming or focusing of the lens group. Using a set of magnetic components 300 can achieve both magnetic adsorption and magnetic drive, reducing external magnetic interference and facilitating device layout within electronic devices.

[0156] Figure 15 This is a third internal structure diagram of the motor drive mechanism provided in the embodiments of this application.

[0157] like Figure 15 As shown, in some embodiments, the motor drive mechanism provided in this application also has a guide shaft 200 slidably connected to a third lens group 903. The third lens group 903 is connected to two guide shafts 200 and can slide relative to the two guide shafts 200 along the optical axis Z0 direction.

[0158] The third lens group 903 is located on the side of the second lens group 902 that is away from the first lens group 901. The first lens group 901, the second lens group 902 and the third lens group 903 are arranged alternately along the x-axis, and their optical axes Z0 coincide.

[0159] The second lens group 902 and the third lens group 903 are both slidably connected to the same set of guide shafts 200. Since the guide shafts 200 are standard parts, they are manufactured with high precision and strength, and their outer circumferential surface is smooth. This allows for precise control of the sliding distance between the second lens group 902 and the third lens group 903, which helps reduce the cumulative assembly deviation of the two lens groups, minimizes dimensional variations caused by fading impacts, prevents lens group tilting and misalignment, avoids optical performance degradation, and thus improves the optical accuracy of the second lens group 902 and the third lens group 903.

[0160] Figure 16A This is a schematic diagram of the fourth internal structure of the motor drive mechanism provided in the embodiments of this application; Figure 16B yes Figure 16A An exploded view of the provided motor drive mechanism.

[0161] like Figure 16A and Figure 16BAs shown, in some embodiments, the magnetic component 300 extends along the x-axis from the second lens group 902 to the third lens group 903, such that the magnetic component 300 is opposite to both the second lens group 902 and the third lens group 903. The second lens group 902 and the third lens group 903 use the same set of magnetic components 300 to achieve magnetic attraction and magnetic drive, which can reduce external magnetic interference and facilitate the device layout within the electronic device.

[0162] In some embodiments, the motor drive mechanism may further include a buffer stop 700.

[0163] The buffer stop 700 is sleeved on the outside of the first sliding bracket 500. When the second lens group 902 slides along the guide shaft 200, the buffer stop 700 slides with the first sliding bracket 500.

[0164] The buffer stop 700 can be made of steel sheet stamping and can include multiple blocking parts 701.

[0165] At least two blocking parts 701 abut against the opposite ends of the first sliding bracket 500 so that the buffer stop 700 covers the first sliding bracket 500, making it easier for the buffer stop 700 to slide with the first sliding bracket 500.

[0166] At least two blocking parts 701 abut against the opposite ends of the second lens group 902 to improve the stability of the second lens group 902 and the first sliding bracket 500, and to prevent misalignment between the two from affecting the sliding accuracy.

[0167] At least one blocking part 701 abuts against the end of the third lens group 903 opposite to the second lens group 902 to block the third lens group 903 from sliding relative to the second lens group 902 in a defined sliding path L2, and can also allow the third lens group 903 and the second lens group 902 to slide together.

[0168] The blocking part 701 can prevent the third lens group 903 from sliding beyond the end of the first sliding bracket 500 facing the light outlet 104. That is, the blocking part 701 can block the third lens group 903, stopping it at the end of the first sliding bracket 500 facing the light outlet 104. Here, the sliding path L2 refers to the distance between the third lens group 903 and the second lens group 902.

[0169] Each blocking part 701 is fitted with a corresponding buffer sleeve 702, which can be made of soft rubber, foam, or other materials. This protects the first sliding bracket 500, the second lens group 902, and the third lens group 903 from damage caused by the impact of the blocking part 701 during fading.

[0170] Figure 17AThis is a schematic diagram of the structure of the third lens group and the second sliding bracket provided in the embodiments of this application; Figure 17B This is an exploded structural diagram of the third lens group and the second sliding bracket provided in the embodiments of this application.

[0171] like Figure 17A and Figure 17B As shown, in some embodiments, the motor drive mechanism may further include a second sliding bracket 600.

[0172] The second sliding bracket 600 is fixedly connected to the third lens assembly 903, in combination with... Figure 16A The second sliding bracket 600 is located at the end of the third lens group 903 facing the magnetic component 300. The second sliding bracket 600 is used to enable the third lens group 903 to slide relative to the two guide shafts 200 along the optical axis Z0.

[0173] The second sliding bracket 600 may include: a coil fixing plate 601, a magnetic steel block 602, and a steel sheet insert 603.

[0174] The coil fixing plate 601 is fixed to one end of the third lens assembly 903. For example, one end of the third lens assembly 903 includes multiple protrusions (not shown in the figure), and the coil fixing plate 601 includes multiple through holes (not shown in the figure). The protrusions are embedded into the through holes one-to-one to fix the coil fixing plate 601 to the third lens assembly 903, and can be further reinforced by adhesives or welding. For example, the number of protrusions and through holes can both be four.

[0175] The magnetic steel block 602 is located on the coil fixing plate 601. For example, the fixing method between the magnetic steel block 602 and the coil fixing plate 601 may include welding or bonding, which will not be elaborated here.

[0176] A steel insert 603 is fixed to one end of the third lens assembly 903. For example, the steel insert 603 can be embedded during the molding of the third lens assembly 903. The steel insert 603 may include two parts, which are spaced apart and embedded in the third lens assembly 903 along the z-axis direction.

[0177] The steel insert 603 may include a third groove 6031 and a fourth groove 6032, wherein the third groove 6031 is one of a V-groove and a U-groove, and the fourth groove 6032 is the other of a V-groove and a U-groove. For example, the third groove 6031 is a U-groove, and the fourth groove 6032 is a V-groove.

[0178] The V-shaped groove and the U-shaped groove can be realized by the shape of the steel insert 603 itself, or by cooperating with the structure of the third lens group 903 itself. For example, the third groove 6031 is a U-shaped groove formed by the upper part of the steel insert 603 and the end structure of the third lens group 903, and the fourth groove 6032 is a V-shaped groove formed by the shape of the steel insert 603 itself.

[0179] Figure 18 yes Figure 15 Schematic diagram of section AA; Figure 19 yes Figure 15 A structural schematic diagram of section BB. Wherein, Figure 18 and Figure 19 The cross-sectional profiles of the first sliding bracket 500 and the third lens group 903 are not shown, in order to illustrate the groove structure on the outside of the guide shaft 200.

[0180] Combination Figure 18 and Figure 19 As shown, in some embodiments, the second sliding bracket 600 is slidably connected to the two guide shafts 200 along the optical axis Z0 direction to realize the sliding of the third lens group 903 relative to the two guide shafts 200 along the optical axis Z0 direction.

[0181] In the structure of the second sliding bracket 600, the magnetic steel block 602 is opposite to the magnetic component 300. The magnetic steel block 602 can be made of ferromagnetic material and can generate a magnetic attraction force with the magnetic component 300. Through the magnetic attraction force between the magnetic steel block 602 and the magnetic component 300, the third lens assembly 903 can be attached to the guide shaft 200, which facilitates the stable sliding of the third lens assembly 903 along the guide shaft 200.

[0182] The opening directions of the third groove 6031 and the fourth groove 6032 formed by the steel insert 603 are both towards the magnetic component 300. The third groove 6031 covers one of the guide shafts 200, and the fourth groove 6032 covers the other guide shaft 200. The steel insert 603, through the contact and engagement of the V-groove and U-groove with the guide shaft 200, enables the third lens assembly 903 to slide along the guide shaft 200.

[0183] The U-shaped groove forms a tangent point with the guide shaft 200, allowing the U-shaped groove to abut against the guide shaft 200 in the y-axis direction, thus preventing the guide shaft 200 from being misaligned in the y-axis direction; the V-shaped groove has two tangent points with the guide shaft 200, allowing the V-shaped groove to frame the guide shaft 200, thus preventing the guide shaft 200 from being misaligned in the z-axis direction.

[0184] In this way, the third slide groove 6031 and the fourth slide groove 6032 adopt slide grooves of different shapes, which can generate forces in different directions on the guide shaft 200 when the third slide groove 6031 and the fourth slide groove 6032 are in contact with the guide shaft 200, so as to improve the assembly accuracy of the guide shaft 200 with the corresponding third slide groove 6031 and the fourth slide groove 6032, and improve the reliability of the sliding connection.

[0185] The steel insert 603 can be made of steel sheet material. Steel sheet material has high strength and low coefficient of friction, which can reduce deformation caused by drop impact and reduce sliding friction.

[0186] Because the opening directions of the first sliding groove 501 and the second sliding groove 502 of the first sliding bracket 500 are opposite to the magnetic component 300, and surround the half-surface of the two guide shafts 200 facing the magnetic component 300; the opening directions of the third sliding groove 6031 and the fourth sliding groove 6032 on the second sliding bracket 600 are both facing the magnetic component 300, and surround the half-surface of the two guide shafts 200 opposite to the magnetic component 300. For example, the first sliding groove 501 and the third sliding groove 6031 cover the same guide shaft 200, and the second sliding groove 502 and the fourth sliding groove 6032 cover the same guide shaft 200.

[0187] In other words, the third lens group 903 shares two guide shafts 200 with the second lens group 902. However, by fitting the two semi-circular surfaces of the guide shafts 200, the third lens group 903 uses the second sliding bracket 600 to encircle the shared guide shafts 200 from both sides, while the second lens group 902 uses the first sliding bracket 500. At this time, the second lens group 902 and the third lens group 903 attract each other, allowing both to adhere to the guide shafts 200 and slide stably along the same guide shafts 200. In this scenario, the guide shafts 200 can also be made of non-ferromagnetic materials.

[0188] It should be noted that the shapes of the sliding grooves on both sides of the guide shaft 200 can be the same or different. For example, the first sliding groove 501 and the third sliding groove 6031 covering the same guide shaft 200 can both be U-shaped grooves (or V-shaped grooves), and the second sliding groove 502 and the fourth sliding groove 6032 covering the other guide shaft 200 can both be V-shaped grooves (or U-shaped grooves). Alternatively, the first sliding groove 501 covering the same guide shaft 200 can be a U-shaped groove, and the third sliding groove 6031 can be a V-shaped groove; the second sliding groove 502 covering the other guide shaft 200 can be a V-shaped groove, and the fourth sliding groove 6032 can be a U-shaped groove.

[0189] In some embodiments, the motor drive mechanism may further include a second coil 402.

[0190] The second coil 402 is located on the third lens assembly 903, and at the end of the third lens assembly 903 facing the magnetic component 300, with the second coil 402 opposite to the magnetic component 300. For example, the second coil 402 is fixed to the coil fixing plate 601 of the second sliding bracket 600 to fix the second coil 402 to the third lens assembly 903. The fixing method may include welding or bonding, etc., which will not be elaborated here.

[0191] Combined again Figure 17A and Figure 17B As shown, the magnetic steel block 602 and the second coil 402 are positioned at an interval on the coil fixing plate 601. This saves space and avoids mutual interference between the magnetic steel block 602 and the second coil 402. Both the magnetic steel block 602 and the second coil 402 are opposite to the magnetic component 300. This facilitates the attraction between the magnetic steel block 602 and the magnetic component 300, and also facilitates the interaction between the second coil 402 and the magnetic component 300 to drive the third lens assembly 903.

[0192] In some embodiments, the second coil 402 adopts a first electrical connection path: the second coil 402 is formed in a ring-shaped winding manner, the second coil 402 includes a positive pole 4021 and a negative pole 4022, and the two parts of the steel sheet insert 603 are respectively welded to the positive pole 4021 and the negative pole 4022 of the second coil 402.

[0193] Applying a lubricating conductive oil to the sliding surfaces of the V-groove and U-groove of the steel insert 603 and the guide shaft 200 can reduce friction and ensure conductivity during sliding.

[0194] Figure 20 This is a first side view of the motor drive mechanism provided in the embodiments of this application; Figure 21 This is a second side view of the motor drive mechanism provided in an embodiment of this application. Wherein, Figure 21 The structure of the base 100 is not shown.

[0195] like Figure 20 and Figure 21 As shown, in some embodiments, the base 100 may include a base insert 102, which may be embedded in one end face of the base 100, the end face being the end face where the light outlet 104 is located.

[0196] One end of the base insert 102 is connected to the guide shaft 200, and the other end of the base insert 102 is connected to the FPC circuit board 802. The number of base inserts 102 is the same as the number of guide shafts 200. The base insert 102 is provided with through holes (not shown in the figure). The end of the guide shaft 200 is inserted into the corresponding through hole of the base insert 102 and connected by soldering. The base insert 102 and the FPC circuit board 802 can also be connected by soldering.

[0197] The base insert 102 can be made of a conductive metal material, which can improve the mechanical reliability of the guide shaft 200 while being welded to it.

[0198] The steel insert 603 not only enables the sliding connection between the third lens group 903 and the guide shaft 200, but also allows it to conduct electricity through contact with the two guide shafts 200. Thus, the second coil 402 is electrically connected to the FPC circuit board 802 sequentially via the second sliding bracket 600 (steel insert 603), the guide shaft 200, and the base insert 102, achieving circuit continuity and allowing the FPC circuit board 802 to input a current signal to the second coil 402.

[0199] Figure 22 This is a second schematic diagram of the current and magnetic field of the motor drive mechanism provided in the embodiments of this application. Wherein, Figure 22 Show Figure 15 The cross-sectional structure along the x-axis. Figure 22 The cross-sectional profiles of the magnetic component 300 and the first coil 401 are not shown to indicate the direction and polarity of the current; ⊙ indicates that the current direction is perpendicular to the paper and outwards. This indicates that the direction of the current is perpendicular to the paper and inwards.

[0200] like Figure 22 As shown, in some embodiments, the third lens group 903 employs a moving-coil drive method. The moving-coil drive principle includes the interaction between a fixed magnet and a moving coil. The magnetic field generated when the coil is energized couples with the static magnetic field of the fixed magnet, driving the coil and lens to move through the Lorentz force.

[0201] In this embodiment, the moving part of the moving coil drive includes a second coil 402 and a third lens group 903, which are fixedly connected by a second sliding bracket 600 and move together; the fixed part includes a magnetic component 300.

[0202] The second coil 402 is configured to slide relative to the magnetic component 300 along the optical axis after receiving a drive signal, so as to drive the third lens group 903 to slide relative to the guide shaft 200, thereby adjusting the distance between the third lens group 903 and the first lens group 901.

[0203] The current I2 input from the FPC circuit board 802 to the second coil 402 is in the direction of right-in and left-out. The left side of the electromagnetic component 300 forms an N→S magnetic field from top to bottom, and the right side forms an N→S magnetic field from bottom to top.

[0204] When a current I2 is passed through the second coil 402, a Lorentz force is generated. According to Fleming's left-hand rule, the direction of the Lorentz force generated in the second coil 402 is to the left. Since the magnetic component 300 is fixed (when no current is passed through the first coil 401), the second coil 402 moves to the left, which in turn drives the third lens assembly 903 to move to the left along the guide shaft 200 via the second sliding bracket 600, that is, to move in the direction of the second lens assembly 902.

[0205] When a left-in, right-out current I2' (not shown in the figure) is passed through the second coil 402, the Lorentz force generated by the second coil 402 and the magnetic component 300 is directed to the right. The second coil 402 moves to the right, causing the third lens assembly 903 to move to the right along the guide shaft 200, i.e., to move away from the second lens assembly 902. The currents I2 and I2' have opposite directions.

[0206] Depending on the actual application, under the action of current I2 and / or I2', the third lens group 903 is controlled to move along the optical axis Z0 to adjust its image distance with the photosensitive chip in the camera module, so as to achieve automatic focus and make the image clear; or, the distance between the lens groups is adjusted to increase or decrease the focal length, so as to magnify or reduce the image.

[0207] based on Figure 14 and Figure 22 The driving principle of the motor drive mechanism shown is as follows: In some embodiments, when the FPC circuit board 802 inputs current I1 to the first coil 401 but not to the second coil 402, due to the blocking effect of the buffer stop 700, under the influence of the magnetic field, the third lens group 903 can move together with the second lens group 902 towards the first lens group 901, and the distance between the third lens group 903 and the second lens group 902 remains unchanged. When the FPC circuit board 802 inputs current I1' to the first coil 401 but not to the second coil 402, the third lens group 903 can move together with the second lens group 902 in a direction away from the first lens group 901, and the distance between the third lens group 903 and the second lens group 902 remains unchanged.

[0208] In some embodiments, when the FPC circuit board 802 does not input current to the first coil 401 but inputs current I2 to the second coil 402, the second lens group 902 and the magnetic component 300 remain stationary. Under the influence of the magnetic field, the third lens group 903 moves toward the second lens group 902, and the distance between the third lens group 903 and the second lens group 902 decreases. When the FPC circuit board 802 does not input current to the first coil 401 but inputs current I2' to the second coil 402, the third lens group 903 moves away from the second lens group 902, and the distance between the third lens group 903 and the second lens group 902 increases.

[0209] In some embodiments, when the FPC circuit board 802 synchronously inputs current I1 to the first coil 401 and current I2 to the second coil 402, under the influence of the magnetic field, the third lens group 903 can either move towards the first lens group 901 together with the second lens group 902, or move towards the second lens group 902. At this time, the distance between the third lens group 903 and the first lens group 901 decreases, and the distance between the third lens group 903 and the second lens group 902 also decreases. When the FPC circuit board 802 inputs current I1' to the first coil 401 and current I2' to the second coil 402, under the influence of the magnetic field, the third lens group 903 can either move away from the first lens group 901 together with the second lens group 902, or move away from the second lens group 902. At this time, the distance between the third lens group 903 and the first lens group 901 increases, and the distance between the third lens group 903 and the second lens group 902 also increases.

[0210] In some embodiments, when the motor drive mechanism only controls the second lens group 902 to slide, the third lens group 903 can slide accordingly, achieving overall sliding of the two movable lens groups to adjust the position of the entire lens assembly relative to the image sensor, thereby controlling the image distance and maximizing image sharpness. Alternatively, the third lens group 903 may not slide, adjusting the distance between the third lens group 903 and the second lens group 902. By changing the distance between the two movable lens groups, the focal length can be adjusted to achieve magnification or reduction of the image.

[0211] In some embodiments, when the motor drive mechanism only controls the sliding of the third lens group 903, the second lens group 902 can remain stationary, allowing adjustment of the distance between the third lens group 903 and the second lens group 902. By changing the distance between the two movable lens groups, the focal length can be adjusted to achieve magnification or reduction of the image. Alternatively, the second lens group 902 can slide simultaneously, enabling the overall sliding of both movable lens groups to adjust the position of the entire lens assembly relative to the image sensor, thereby controlling the image distance and maximizing image sharpness.

[0212] In some embodiments, when the motor drive mechanism simultaneously controls the sliding of the second lens group 902 and the third lens group 903, the distance between the second lens group 902 and the first lens group 901, and the distance between the third lens group 903 and the second lens group 902, can be adjusted. By changing the distance between the two movable lens groups, the focal length can be adjusted to achieve magnification or reduction of the image. Alternatively, the two movable lens groups can be slid together to adjust the position of the entire lens assembly relative to the image sensor, thereby controlling the image distance and maximizing image sharpness.

[0213] It should be noted that the above embodiments are merely illustrative examples of application scenarios where the motor drive mechanism controls the second lens group 902 and / or the third lens group 903 to slide, thereby achieving optical focusing or zoom. They are not intended to limit specific application scenarios, nor do they exhaust all application scenarios. Whether the second lens group 902 and / or the third lens group 903 slides and the direction of sliding can be controlled according to the actual application situation to achieve optical focusing or zoom.

[0214] The motor drive mechanism provided in this application embodiment uses a guide shaft 200 to constrain the sliding of the second lens group 902 and the third lens group 903 along the optical axis. Because the guide shaft 200 has high manufacturing precision and strength, it helps to reduce the cumulative assembly deviation of the second lens group 902 and the third lens group 903, avoiding optical axis misalignment. It can also reduce dimensional variations caused by fading impacts, preventing tilting and misalignment of the second lens group 902 and the third lens group 903, thereby avoiding optical performance degradation and improving optical accuracy. Using the first coil 401 and the magnetic component 300, a moving magnet drive method is used to control the sliding direction of the second lens group 902 along the optical axis; using the second coil 402 and the magnetic component 300, a moving coil drive method is used to control the sliding direction of the third lens group 903 along the optical axis, thereby achieving zooming or focusing of the lens groups. The second lens group 902 and the third lens group 903 share the same set of magnetic components 300, which can achieve both magnetic adsorption and magnetic drive, reducing external magnetic interference and facilitating device layout within electronic devices.

[0215] See you again Figure 17A and Figure 17B As shown, in some embodiments, the motor drive mechanism may further include a position feedback magnet 801.

[0216] The position feedback magnet 801 is located on the third lens group 903. The position feedback magnet 801 is used to provide feedback on the real-time position of the third lens group 903 to achieve closed-loop control.

[0217] Figure 23 This is a schematic diagram of the structure of the FPC circuit board provided in the embodiments of this application; Figure 24 This is a schematic diagram of the bottom structure of the motor drive mechanism provided in the embodiments of this application; Figure 25 This is a schematic diagram showing the positions of the magnetic field position detection element and the magnet provided in an embodiment of this application. Figure 25 The structure of the base 100 is not shown.

[0218] like Figure 23 , Figure 24 and Figure 25 As shown, in some embodiments, the FPC circuit board 802 includes a first magnetic field position detection element 8021 and a second magnetic field position detection element 8022.

[0219] The FPC circuit board 802 includes an extension 802a, on which a first magnetic field position detection element 8021 and a second magnetic field position detection element 8022 are located. The extension 802a extends to the bottom surface of the base 100, such that the first magnetic field position detection element 8021 and the second magnetic field position detection element 8022 correspond one-to-one with the magnetic component 300 and the position feedback magnet 801, respectively. The bottom surface of the base 100 is connected to the end face of the light inlet 103, the end face of the light outlet 104, and the end face of the first coil 401, respectively.

[0220] The first magnetic field position detection element 8021 is positioned relative to the magnetic component 300. The first magnetic field position detection element 8021 detects the position change of the magnetic component 300 to detect the real-time position of the second lens group 902, so as to realize closed-loop control of the second lens group 902.

[0221] The second magnetic field position detection element 8022 is positioned relative to the position feedback magnet 801. The second magnetic field position detection element 8022 detects the position change of the position feedback magnet 801 to detect the real-time position of the third lens group 903, so as to realize closed-loop control of the third lens group 903.

[0222] In this way, by using the first magnetic field position detection element 8021 and the second magnetic field position detection element 8022, the position information of the magnetic component 300 and the position feedback magnet 801 are fed back in real time during the moving magnet drive and moving coil drive processes, respectively, so as to realize closed-loop control of the second lens group 902 and the third lens group 903 and improve the control accuracy.

[0223] Figure 26A This is a schematic diagram of the fourth internal structure of the motor drive mechanism provided in the embodiments of this application; Figure 26B This is a fifth internal structure schematic diagram of the motor drive mechanism provided in the embodiments of this application. Wherein, Figure 26A and Figure 26B The structure is shown from different perspectives.

[0224] like Figure 26A and Figure 26B As shown, in some embodiments, the motor drive mechanism provided in this application differs from the motor drive mechanism provided in any of the foregoing embodiments in that the second coil 402 can adopt a second electrical connection path. Other contents can be referred to the contents of any of the foregoing embodiments, and will not be repeated here.

[0225] In this embodiment, the motor drive mechanism may include: a folded flexible circuit board 803; one end of the folded flexible circuit board 803 is connected to the second coil 402, and the other end extends to the edge of the base 100 and is connected to the FPC circuit board 802.

[0226] The foldable flexible circuit board 803 is in a folded state and can produce elastic deformation. When the third lens group 903 slides along the guide shaft 200, the foldable flexible circuit board 803 simultaneously contracts or expands to avoid hindering the sliding of the third lens group 903.

[0227] In the motor drive mechanism provided in this application embodiment, the second coil 402 is electrically connected to the FPC circuit board 802 via a folded flexible circuit board 803, which simplifies the electrical connection method of the second coil 402. Since the second coil 402 no longer needs the guide shaft 200 for electrical connection, the guide shaft 200 does not need to be made of conductive material, thus saving costs.

[0228] Figure 27A This is a schematic diagram of the structure of the camera module provided in the embodiments of this application; Figure 27B This is an exploded view of the camera module provided in an embodiment of this application.

[0229] like Figure 27A and Figure 27B As shown, in some embodiments, the camera module 50 provided in this application may include: a first lens group 901, a second lens group 902, a third lens group 903, a photosensitive chip 904, a prism 906, a main circuit board 907, and a motor drive mechanism 905 as provided in any of the foregoing embodiments.

[0230] The first lens group 901, the second lens group 902, and the third lens group 903 are spaced apart on the motor drive mechanism 905. It should be noted that the specific arrangement of the first lens group 901, the second lens group 902, and the third lens group 903 can be referred to the corresponding content of the aforementioned embodiment of the motor drive mechanism 905, and will not be repeated here.

[0231] Both the photosensitive chip 904 and the main circuit board 907 are located on the side of the motor drive mechanism 905 adjacent to the third lens group 903, i.e., on the side of the light outlet 104. The photosensitive chip 904 is located on the main circuit board 907 and faces the motor drive mechanism 905. The FPC circuit board 802 and the foldable flexible circuit board 803 in the motor drive mechanism 905 can be connected to the main circuit board 907 to enable the conduction of electrical signals.

[0232] Prism 906 is fixed on prism base 9061 and located on the side of motor drive mechanism 905 near the first lens group 901, i.e., on the side of light entrance 103. Prism 906 is used to change the direction of light path, for example, refracting perpendicularly incident light by 90°. Using prism 906 allows the lens groups to be arranged horizontally (x-axis direction), without occupying too much space in the z-axis direction of the electronic device, thus saving space.

[0233] External light rays are incident along the z-axis, deflected by prism 906, and propagate along the x-axis. They then pass sequentially through the first lens group 901, the second lens group 902, and the third lens group 903 before being received by the photosensitive chip 904. The photosensitive chip 904 utilizes the photoelectric conversion function of its photoelectric device to convert the light image on its light-receiving surface into an electrical signal proportional to the light image, thereby forming an image.

[0234] It should be noted that the camera module 50 may also include other auxiliary components such as filters and fill lights, which will not be elaborated here.

[0235] The camera module 50 provided in this application embodiment includes a motor drive mechanism 905 that uses a moving magnet drive method and a moving coil drive method to control the sliding direction of the second lens group 902 and the third lens group 903 along the optical axis relative to the guide shaft 200, thereby achieving zooming or focusing. This avoids optical axis misalignment and reduces dimensional variations caused by fading impacts, preventing tilting and misalignment of the second lens group 902 and the third lens group 903, thus avoiding optical performance degradation and improving optical accuracy. The second lens group 902 and the third lens group 903 share the same set of magnetic components 300, enabling both magnetic adsorption and magnetic drive, reducing external magnetic interference. This not only improves the optical accuracy of the camera module 50 but also reduces the space occupied by the camera module 50 in the thickness direction of the electronic device, thereby enabling the development of thinner and lighter electronic devices.

[0236] Figure 28 This is a rear view of the electronic device provided in the embodiments of this application.

[0237] Combination Figure 1 and Figure 28As shown, in some embodiments, the electronic device of this application includes a display screen 10, a mid-frame 20, a rear cover 30, and a camera module 50 provided in the foregoing embodiments.

[0238] The display screen 10 and the back cover are located on opposite sides of the middle frame 20. The display screen 10, the middle frame 20 and the back cover 30 are snapped together in sequence to form the whole body cavity.

[0239] The camera module 50 is located within the overall cavity of the device, and its length is along the x-axis of the electronic device. The various lens groups within the camera module 50 are distributed along the x-axis to avoid occupying space along the z-axis of the electronic device, thus saving space.

[0240] It should be noted that the entire housing also includes components such as a communication module, circuit board, battery, and speaker assembly, which will not be listed here. Furthermore, the specific structure of the camera module 50 can be found in the aforementioned embodiments and will not be repeated here.

[0241] The electronic device provided in this application embodiment uses a camera module 50 with high optical precision to improve the camera function of the electronic device. The camera module 50 does not occupy space in the thickness direction of the electronic device, which enables the development of a thinner and lighter electronic device.

[0242] It should be noted that those skilled in the art, upon considering the specification and practicing the application disclosed herein, will readily conceive of other embodiments of this application. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope of this application is indicated by the following claims.

[0243] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A motor drive mechanism, characterized in that, include: The base (100) is fixedly connected to the first lens group (901); A guide shaft (200) is fixed to the base (100) along the optical axis of the first lens group (901); the guide shaft (200) is slidably connected to the second lens group (902), and the optical axis of the second lens group (902) coincides with the optical axis of the first lens group (901); A magnetic component (300) is located at one end of the second lens assembly (902); The first coil (401) is located on the base (100) and opposite to the magnetic component (300); The first coil (401) is configured to receive a drive signal to drive the magnetic component (300) to move along the optical axis, thereby causing the second lens group (902) to slide relative to the guide shaft (200) to adjust the distance between the second lens group (902) and the first lens group (901).

2. The motor drive mechanism according to claim 1, characterized in that, The number of guide shafts (200) includes two; The two guide shafts (200) are spaced apart along a first direction and are respectively fixed on the base (100), the first direction being perpendicular to the optical axis; The second lens assembly (902) is connected to the two guide shafts (200) and can slide relative to the two guide shafts (200).

3. The motor drive mechanism according to claim 2, characterized in that, The base (100) has two positioning holes (101) on its two opposite end faces, and the two positioning holes (101) on the same end face are spaced apart along the first direction. The two ends of the two guide shafts (200) are embedded in the four positioning holes (101) one by one.

4. The motor drive mechanism according to claim 3, characterized in that, The surface of the positioning hole (101) includes at least two positioning facets (1011), which are tangent to the outer circumferential surface of the guide shaft (200).

5. The motor drive mechanism according to claim 2, characterized in that, It also includes: a first sliding bracket (500); The first sliding bracket (500) is fixedly connected to the second lens group (902) and slidably connected to the two guide shafts (200) along the optical axis.

6. The motor drive mechanism according to claim 5, characterized in that, The first sliding bracket (500) includes a first sliding groove (501) and a second sliding groove (502); The first groove (501) covers one of the guide shafts (200), and the second groove (502) covers the other guide shaft (200).

7. The motor drive mechanism according to claim 6, characterized in that, The opening direction of the first groove (501) and the opening direction of the second groove (502) are both away from the magnetic component (300); The first groove (501) is one of a V-groove and a U-groove, and the second groove (502) is the other of a V-groove and a U-groove.

8. The motor drive mechanism according to claim 5, characterized in that, The surface of the first sliding bracket (500) facing the first coil (401) includes a receiving groove (503), in which the magnetic component (300) is embedded.

9. The motor drive mechanism according to claim 7, characterized in that, It also includes: a second coil (402), opposite to the magnetic component (300); The guide shaft (200) is also slidably connected to a third lens group (903), which is located on the side of the second lens group (902) opposite to the first lens group (901); the second coil (402) is located on the third lens group (903); the optical axis of the third lens group (903) coincides with the optical axis of the first lens group (901); The second coil (402) is configured to slide relative to the magnetic component (300) along the optical axis after receiving a drive signal, so as to drive the third lens group (903) to slide relative to the guide shaft (200) to adjust the distance between the third lens group (903) and the second lens group (902).

10. The motor drive mechanism according to claim 9, characterized in that, It also includes: a second sliding bracket (600); The second sliding bracket (600) is fixedly connected to the third lens group (903) and slidably connected to the two guide shafts (200) along the optical axis.

11. The motor drive mechanism according to claim 10, characterized in that, The second sliding bracket (600) includes: a coil fixing plate (601) and a magnetic steel block (602); The coil fixing plate (601) is fixed to one end of the third lens group (903); The magnetic steel block (602) and the second coil (402) are spaced apart on the coil fixing plate (601), and the magnetic steel block (602) is opposite to the magnetic component (300).

12. The motor drive mechanism according to claim 11, characterized in that, The second sliding bracket (600) further includes a steel plate insert (603), which is fixed to one end of the third lens assembly (903); The steel insert (603) includes a third groove (6031) and a fourth groove (6032); The third groove (6031) covers one of the guide shafts (200), and the fourth groove (6032) covers the other guide shaft (200).

13. The motor drive mechanism according to claim 12, characterized in that, The opening direction of the third slide (6031) and the opening direction of the fourth slide (6032) are both towards the magnetic component (300); The third groove (6031) is one of a V-groove and a U-groove, and the fourth groove (6032) is the other of a V-groove and a U-groove.

14. The motor drive mechanism according to claim 9, characterized in that, Also includes: buffer stop (700); The buffer stop (700) is sleeved on the outside of the first sliding bracket (500), and the buffer stop (700) slides with the first sliding bracket (500); The buffer stop (700) includes a plurality of blocking parts (701), which are respectively abutted against the opposite ends of the first sliding bracket (500), the opposite ends of the second lens group (902), and the end of the third lens group (903) away from the second lens group (902).

15. The motor drive mechanism according to claim 14, characterized in that, Each of the blocking parts (701) is fitted with a corresponding buffer sleeve (702).

16. The motor drive mechanism according to claim 10, characterized in that, Also includes: position feedback magnet (801); The position feedback magnet (801) is located on the third lens group (903).

17. The motor drive mechanism according to claim 16, characterized in that, It also includes: an FPC circuit board (802) located on the base (100); The first coil (401) is electrically connected to the FPC circuit board (802).

18. The motor drive mechanism according to claim 17, characterized in that, The FPC circuit board (802) includes a first magnetic field position detection element (8021) and a second magnetic field position detection element (8022); The first magnetic field position detection element (8021) is positioned opposite to the magnetic component (300) and is used to detect the position of the second lens group (902); The second magnetic field position detection element (8022) is positioned opposite to the position feedback magnet (801) and is used to detect the position of the third lens group (903).

19. The motor drive mechanism according to claim 17, characterized in that, The base (100) includes a base insert (102), one end of which is connected to the guide shaft (200) and the other end is connected to the FPC circuit board (802); The second coil (402) is electrically connected to the FPC circuit board (802) via the second sliding bracket (600), the guide shaft (200), and the base insert (102).

20. The motor drive mechanism according to claim 17, characterized in that, Also includes: foldable flexible circuit board (803); One end of the foldable flexible circuit board (803) is connected to the second coil (402), and the other end is connected to the FPC circuit board (802).

21. A camera module, characterized in that, include: The first lens group (901), the second lens group (902), the third lens group (903), the photosensitive chip (904), and the motor drive mechanism (905) as described in any one of claims 1-20; The first lens group (901), the second lens group (902) and the third lens group (903) are spaced apart on the motor drive mechanism (905); The photosensitive chip (904) is located on the side of the motor drive mechanism (905) adjacent to the third lens group (903); The light passes sequentially through the first lens group (901), the second lens group (902), and the third lens group (903) before being received by the photosensitive chip (904).

22. An electronic device, characterized in that, Includes a display screen, a mid-frame, a rear cover, and, as described in claim 21, a camera module; The display screen and the rear shell are located on opposite sides of the middle frame and are connected to the middle frame to form the whole body cavity; The camera module is located inside the main body cavity.

Images