Voice coil motor structural member with buffering function and preparation method thereof

Abstract

The invention discloses a voice coil motor structural member with a buffering function and a preparation method thereof.The voice coil motor structural member comprises a voice coil motor body and a buffering structure, the voice coil motor body comprises a shell, a coil assembly and a magnetic circuit system, the coil assembly comprises a coil frame and a coil wound around the coil frame, and the magnetic circuit system comprises a permanent magnet; the buffer structure is arranged on at least one moving part of a voice coil motor main body, is used for providing a buffer effect when the voice coil motor moves and reducing collision and vibration, and comprises a buffer pad, a buffer unit and a buffer spring. According to the voice coil motor, the buffering assembly is arranged at the key part, so that impact and vibration of the voice coil motor in the movement process are effectively relieved, and the stability and reliability are improved. Meanwhile, the preparation method is simple and efficient, large-scale production is easy to realize, and powerful support is provided for wide application of the voice coil motor. The high-precision and high-stability voice coil motor is suitable for various occasions requiring high-precision and high-stability voice coil motors, such as mobile phone cameras, optical instruments and the like.

Description

Technical Field

[0001] The present invention relates to a voice coil motor, in particular to a voice coil motor structure with a buffering function and a preparation method thereof. Background Art

[0002] With the continuous advancement of technology, voice coil motors are increasingly used in electronic devices. Traditional voice coil motors primarily consist of a housing, coil assembly, magnetic circuit system, and drive circuitry. During operation, the drive circuit supplies current to the coil assembly, which, in turn, moves under the influence of the magnetic field, thereby achieving the driving function. However, due to the collisions and vibrations generated during the movement of voice coil motors, these components can wear and loosen, affecting their performance and service life.

[0003] To solve this problem, people have tried to add buffer elements to the structure of voice coil motors to reduce collisions and vibrations. However, existing buffer elements often have problems such as complex structure, inconvenient installation, and limited buffering effect. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a voice coil motor structure with a buffering function and a preparation method thereof.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A voice coil motor structure with a buffering function includes a voice coil motor body and a buffering structure. The voice coil motor body includes a shell, a coil assembly and a magnetic circuit system. The coil assembly includes a coil frame and a coil wound on the coil frame. The magnetic circuit system includes a permanent magnet. The buffering structure is arranged on at least one moving part of the voice coil motor body and is used to provide a buffering effect when the voice coil motor moves to reduce collision and vibration. The buffering structure includes a buffer pad, a buffer unit and a buffer spring.

[0007] The buffer pad is made of an elastic material selected from rubber, silicone or polyurethane, and the thickness of the buffer pad ranges from 0.5 mm to 3 mm.

[0008] The buffer pad is arranged on the outer periphery of the coil assembly or the inner side of the magnetic circuit system, and is used to provide buffering between the coil assembly and the magnetic circuit system.

[0009] The buffer unit is cylindrical, fan-shaped or wedge-shaped, and is made of an elastic material selected from rubber, silicone, polyurethane or spring steel, with a hardness range of Shore hardness A30 to A90.

[0010] A plurality of grooves are arranged on the surface of the buffer unit, wherein the groove depth ranges from 0.2 mm to 1 mm and the width ranges from 0.5 mm to 2 mm, and the grooves are evenly distributed along the axis direction of the buffer unit.

[0011] The buffer spring is connected to the moving part of the voice coil motor body. The buffer spring is made of spring steel, with a diameter ranging from 0.2 mm to 1 mm, a number of turns ranging from 3 to 10 turns, and a free length ranging from 5 mm to 20 mm.

[0012] The device also includes a driving circuit for driving the coil assembly to move. The driving circuit is electrically connected to the coil assembly and is used to control the movement of the coil assembly.

[0013] A method for preparing a voice coil motor structure with a buffering function, characterized by comprising the following steps:

[0014] S1: Prepare the various components of the voice coil motor body, including the housing, coil assembly and magnetic circuit system;

[0015] S2: Select the buffer material and prepare it into a buffer structure that matches the main moving parts of the voice coil motor according to the design requirements;

[0016] S3: Install the buffer structure to the corresponding position of the voice coil motor body to ensure a tight fit;

[0017] S4: Assemble other components of the voice coil motor body to form a complete voice coil motor structure, where the tolerance range of the fitting accuracy is ±0.01mm to ±0.05mm.

[0018] S5: Perform performance testing and debugging on voice coil motor components, including buffer performance testing, motion performance testing, and stability testing.

[0019] When preparing the buffer structure, mold forming, cutting or bonding methods are adopted, among which the mold forming temperature range is 80℃ to 150℃, and the pressure range is 5MPa to 20Mpa; the installation method of the buffer structure and the voice coil motor body includes bonding, clamping or threaded connection, among which epoxy resin glue is used for bonding, the curing temperature range is 60℃ to 120℃, and the curing time range is 1 hour to 5 hours; the clamping adopts a snap-on structure, and the thickness of the snap is in the range of 0.5mm to 2mm; the threaded connection adopts screws of specifications M2 to M5, and the thread depth range is 3mm to 10mm.

[0020] The cushioning performance test uses an impact tester with an impact energy range of 0.1J to 1J; the motion performance test uses a displacement sensor with a measurement range of ±0.1mm to ±5mm; and the stability test uses a vibration table with a vibration frequency range of 10Hz to 1000Hz and an amplitude range of 0.1mm to 1mm. Compared with the existing technology, the present invention has the following advantages:

[0021] 1. Simple structure: The buffer structure of the present invention adopts a simple buffer pad and / or buffer spring design, which does not require a complex mechanical structure and processing technology, reducing manufacturing costs and production difficulty.

[0022] 2. Easy installation: The buffer structure is installed to the corresponding position of the voice coil motor body by bonding, clamping or threaded connection, which is easy and quick to operate and improves production efficiency.

[0023] 3. Significant buffering effect: The buffering structure of the present invention can effectively absorb and disperse the energy generated by collision and vibration, protect the main structure of the voice coil motor from damage, and extend its service life.

[0024] 4. Wide applicability: The voice coil motor structure and the preparation method thereof of the present invention are applicable to voice coil motors of various types and specifications and have broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the main structure of the voice coil motor of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the voice coil motor and coil of the present invention;

[0027] Figure 3 Schematic diagram of the buffer layer of the voice coil motor of the present invention. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like are used to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0030] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0031] Voice coil motors (VCMs) are widely used in electronic device drivers. Their core structure consists of a housing, coil assembly, and magnetic circuit system. Traditional solutions control the movement of the coil assembly through a drive circuit. However, during high-speed reciprocating motion, frequent collisions between components lead to structural wear and vibration transmission. Existing attempts to incorporate a single buffer element suffer from a single buffering direction and limited installation space. For example, simply placing a rubber pad on the outside of the coil bobbin fails to effectively suppress multi-dimensional vibrations.

[0032] By analyzing the stress characteristics of voice coil motor moving components, we found that axial impact, radial runout, and torsional vibration are the primary factors contributing to component wear. Based on this, we proposed decomposing the buffer structure into three functional units: an elastic cushion layer to absorb axial impact, a cylindrical buffer unit to limit radial displacement, and a coil spring to alleviate torsional stress. This multi-layered buffering mechanism synergizes to achieve three-dimensional vibration suppression.

[0033] like Figure 1-3As shown, the present application proposes a voice coil motor structure with a buffering function, including a voice coil motor body 1 and a buffering structure 3. The voice coil motor body 1 is composed of a shell, a coil assembly 2 and a magnetic circuit system. The coil assembly 2 includes a coil frame and a wound coil. The magnetic circuit system includes a permanent magnet. The buffering structure 3 is arranged on the moving part of the voice coil motor body and includes a buffer pad, a buffer unit and a buffer spring.

[0034] Among them, the buffer pad refers to a contact layer made of elastic material, which can be specifically implemented by rubber or silicone sheets. It is fixed to the periphery of the coil assembly by bonding and is used to absorb the direct collision energy generated by axial movement. The buffer unit refers to an elastomer with a specific geometric shape, which can be specifically implemented by a fan-shaped polyurethane block. It is installed on the inside of the magnetic circuit system through a snap-fit ​​structure to limit the radial offset of the coil assembly. The buffer spring refers to a metal component with elastic deformation ability, which can be specifically implemented by a miniature coil spring. It is combined with the moving part through a threaded connection to offset the shear force generated by torsional movement.

[0035] Specifically, when the coil assembly moves in a magnetic field, the cushion absorbs axial impact through compression deformation, the buffer unit limits radial displacement through lateral extrusion, and the buffer spring balances torsional stress through elastic recovery. These three elements complement each other in different motion dimensions: the cushion reduces high-frequency vibration amplitude, the buffer unit suppresses mid-frequency swing, and the buffer spring mitigates low-frequency resonance. This layered buffering mechanism gradually dissipates the kinetic energy of the moving components, preventing the transient impact caused by rigid collisions.

[0036] Compared to existing technologies, traditional solutions use only a single buffer layer and are unable to cope with multi-directional, complex vibrations. This solution achieves three-dimensional vibration control through a modular buffer structure, significantly improving energy absorption efficiency within the same installation space. While existing buffer components require separate processing and assembly, this solution utilizes a modular design to integrate the buffer unit with the motor body, reducing assembly complexity.

[0037] Through the above technical solution, this application effectively solves the problem of component wear caused by the superposition of multi-dimensional vibrations during the movement of the voice coil motor, extends the service life of key moving components through a layered buffering mechanism, and maintains the compactness of the structure. It is suitable for precision driving scenarios that are sensitive to vibration, such as high-precision optical image stabilization systems.

[0038] The present application further proposes a voice coil motor structure with a buffering function, wherein the buffer pad is made of an elastic material selected from rubber, silicone or polyurethane, and the thickness of the buffer pad ranges from 0.5 mm to 3 mm.

[0039] Elastic materials are materials that can deform under external forces and return to their original shape after the force is removed. These materials can be rubber, silicone, or polyurethane. These materials have different elastic moduli and damping properties to suit different working conditions. The thickness range refers to the vertical dimension of the cushion in its uncompressed state. This range can be achieved by adjusting the number of material layers or molding process parameters. This range can help balance the conflict between cushioning effectiveness and structural space occupation.

[0040] Specifically, the cushioning pad is positioned around the coil assembly or inside the magnetic circuit system. When the voice coil motor moves, the elastic material deforms to absorb the impact energy between the coil assembly and the magnetic circuit system, thereby reducing vibration caused by rigid contact. For example, during the high-speed reciprocating motion of the voice coil motor, the coil assembly may collide with the magnetic circuit system due to inertia. At this time, the cushioning pad converts mechanical energy into heat energy through the stretching and compression of the molecular chains within the material, effectively reducing the instantaneous impact force.

[0041] Compared to existing technologies, traditional cushioning components often use a single material and lack targeted thickness design. For example, using only rubber without optimizing thickness parameters can lead to insufficient cushioning or a bloated structure. However, this solution, by limiting the combination of elastic material types and thickness ranges, ensures stable cushioning performance while avoiding the problem of limited travel caused by excessively thick cushioning pads.

[0042] Through the above technical solution, the present application can effectively reduce the collision strength between the moving parts of the voice coil motor, reduce the wear of components and loose connections caused by frequent impacts, while maintaining the compactness of the overall structure of the voice coil motor, and is suitable for electronic equipment application scenarios that require high-precision motion control.

[0043] The present application further proposes a voice coil motor structure with a buffering function, including a voice coil motor body and a buffering structure. The buffering structure is arranged on at least one moving part of the voice coil motor body. The buffering structure includes a buffer pad. The buffer pad is arranged on the periphery of the coil assembly or the inner side of the magnetic circuit system to provide buffering between the coil assembly and the magnetic circuit system.

[0044] The buffer pad is a flexible component made of an elastic material, specifically rubber, silicone, or polyurethane, produced through a mold forming or cutting process. Its function is to absorb the impact energy generated by the relative motion between the coil assembly and the magnetic circuit system through elastic deformation. The outer periphery of the coil assembly refers to the annular area on the outer surface of the coil former, while the inner side of the magnetic circuit system refers to the side of the surface opposite the permanent magnet and the coil assembly. The buffer pad is fixed to this area by bonding or clamping, thereby forming a physical isolation layer between the coil assembly and the magnetic circuit system.

[0045] Specifically, when the coil assembly moves axially under the action of the driving current, the cushion cushions the contact area between the coil assembly and the magnetic circuit system through its own elastic deformation. When the coil assembly moves to the extreme position, the cushion preferentially contacts the magnetic circuit system or the housing, dispersing the impact force through compression deformation and avoiding rigid collision. For example, an annular cushion is provided around the periphery of the coil assembly to cover the entire contact surface between the coil frame and the magnetic circuit system, further reducing the risk of local stress concentration.

[0046] Compared to existing solutions, which typically install buffer components independently in non-contact areas within the housing, this results in an indirect buffer path and redundant structure. This solution integrates the buffer pad directly into the contact interface between the coil assembly and the magnetic circuit system, shortening the impact transmission path and simplifying the installation structure, resulting in a more concentrated buffering effect and faster response.

[0047] Through the above technical solution, the present application effectively reduces the collision strength between the coil assembly and the magnetic circuit system during the movement of the voice coil motor, reduces component wear and position displacement caused by repeated impact, thereby improving the motor operation stability and extending its service life.

[0048] The present application further proposes a voice coil motor structure with a buffering function. The buffer unit is cylindrical, fan-shaped or wedge-shaped and is made of an elastic material. The elastic material is selected from rubber, silicone, polyurethane or spring steel, and the hardness range is Shore hardness A30 to A90.

[0049] Among them, the columnar buffer unit refers to a structure with a cylindrical or prismatic appearance, which can be specifically realized by injection molding technology and is suitable for axial force scenarios.

[0050] Among them, the fan-shaped buffer unit refers to a structure with an arc-shaped cross-section, which can be specifically realized by cutting elastic plates and is suitable for circumferential gap filling scenarios.

[0051] Among them, the wedge-shaped buffer unit refers to a geometric body with a sloped structure, which can be realized by a compression molding process and is suitable for buffering scenarios with inclined contact surfaces.

[0052] Among them, the hardness range of the elastic material is measured by a Shore hardness tester, which can be specifically achieved by using a composite structure of rubber and spring steel to improve fatigue resistance while ensuring elastic deformation capability.

[0053] Specifically, when the voice coil motor's moving parts are displaced, the differently shaped buffer units absorb kinetic energy through elastic deformation. Cylindrical units evenly distribute stress during axial compression, fan-shaped units form multi-level buffering contact surfaces within the circumferential gap, and wedge-shaped units gradually increase buffering resistance through inclined contact surfaces. The hardness of the elastic material ensures that the buffer units maintain shape stability under multiple cyclic loads. Rubber-based materials provide high elastic recovery, while spring steel enhances structural support strength.

[0054] Compared to existing technologies, traditional cushioning elements typically adopt a single shape and limited material selection, resulting in poor installation adaptability and prone to permanent deformation. This solution, through the diversified design of geometric shapes, can adapt to the spatial layout of different moving parts. By combining elastic and metal materials, it significantly improves structural durability while maintaining cushioning performance.

[0055] Through the above technical solution, this application effectively solves the stress concentration problem caused by the single shape of the buffer element during voice coil motor movement, avoiding buffer failure caused by material fatigue. The combination of buffer units with different shapes can adapt to multi-dimensional motion directions, and the synergistic effect of the elastic and metal materials extends the service life of the buffer structure.

[0056] The present application further proposes that a plurality of grooves are provided on the surface of the buffer unit, wherein the groove depth ranges from 0.2 mm to 1 mm, the width ranges from 0.5 mm to 2 mm, and the grooves are evenly distributed along the axial direction of the buffer unit.

[0057] Grooves are regular, indented structures formed on the surface of the buffer unit, typically achieved through mechanical cutting or die forming. They increase the elastic deformation space within the buffer unit to disperse impact energy. Axial uniform distribution means the grooves are arranged parallel to the buffer unit's trajectory, typically achieved through an evenly spaced layout. This ensures uniform stress distribution across all regions of the buffer unit when subjected to force.

[0058] Specifically, grooves are placed on the surface of the buffer unit where it contacts the voice coil motor's moving parts. When the motor generates an impact, the grooves deform to absorb energy while avoiding localized stress concentrations through their uniform distribution. The grooves can be varied in depth and width to accommodate varying impact loads, for example, using shallow, narrow grooves for low-energy impacts and deep, wide grooves for high-energy impacts.

[0059] Compared with existing technologies, traditional buffer units often use smooth surfaces or simple raised structures, which are prone to material fatigue fracture under repeated impact. This solution uses a regular groove design to improve elastic deformation capacity while maintaining structural strength. At the same time, the uniform distribution along the axis avoids localized failure caused by stress concentration.

[0060] Through the above technical solution, the present application effectively reduces the internal stress peak of the buffer unit during the impact process, extends the service life of the buffer structure, and at the same time improves the vibration energy absorption efficiency through groove deformation and distribution optimization.

[0061] The present application further proposes that a buffer spring is connected to the moving part of the voice coil motor body, the buffer spring is made of spring steel, has a diameter range of 0.2 mm to 1 mm, a number of turns range of 3 to 10 turns, and a free length range of 5 mm to 20 mm.

[0062] A buffer spring is a helical elastic element that absorbs mechanical energy through elastic deformation. This is achieved by cold-rolling spring steel wire into a helical structure. Its rigid connection to the moving part creates an elastic support. Spring steel refers to an alloy steel material with a carbon content of 0.6% to 0.95%. Specifically, it can be made from 60Si2Mn steel through a quenching and medium-temperature tempering process. This material has a high elastic limit and fatigue resistance. The diameter range is achieved by controlling the wire diameter to achieve different stiffnesses. The number of turns is controlled by adjusting the number of turns to control the elastic stroke. The free length range is achieved by setting the original spring length to balance space occupancy with the buffer stroke.

[0063] Specifically, when the voice coil motor body moves, the buffer spring undergoes elastic deformation through axial compression or extension, converting the kinetic energy of the moving component into elastic potential energy. The spring steel maintains a stable elastic modulus during repeated deformation, preventing buffer failure due to plastic deformation. The combination of diameter parameters and number of turns creates a stepped stiffness profile, providing minimal resistance during initial movement and increasing buffering force as the travel limit is approached. The combination of free length and installation preload adjusts the initial force, preventing movement of the moving component from deflecting when stationary.

[0064] Compared to existing technologies, traditional cushioning components often use rubber blocks of a single hardness, which cannot be adjusted and is prone to creep over time. However, the coil spring structure allows precise control of cushioning characteristics through geometric parameters. The elastic recovery of spring steel surpasses that of polymer materials, maintaining stable cushioning performance even under frequent start-stop conditions. By adjusting the combination of diameter, number of coils, and free length, a graded cushioning solution can be customized for different load requirements.

[0065] Through the above technical solution, this application effectively suppresses the rigid impact generated during the movement of the voice coil motor and reduces the abnormal noise caused by collisions between components. The spring steel material avoids the aging and cracking problems of traditional rubber buffers. The spiral structure achieves a controllable buffer stroke within a limited space, allowing the voice coil motor to maintain stable positioning accuracy during high-speed reciprocating motion.

[0066] The present application further proposes that it also includes a driving circuit for driving the coil assembly to move. The driving circuit is electrically connected to the coil assembly and is used to control the movement of the coil assembly.

[0067] Among them, the drive circuit refers to the electronic control module that controls the movement of the coil assembly by adjusting the current signal. Specifically, it can be implemented using a closed-loop control circuit or a pulse width modulation circuit. The drive current is adjusted by real-time feedback of the coil position information, thereby accurately controlling the motion trajectory.

[0068] Among them, electrical connection refers to establishing a conductive path between the drive circuit and the coil assembly, which can be achieved by welding, plugging or conductive adhesive bonding to ensure that the current signal is stably transmitted to the coil.

[0069] Specifically, the drive circuit generates a corresponding drive current by receiving an external control signal. This current, when fed into the coil, interacts with the permanent magnets in the magnetic circuit system, generating an electromagnetic force that drives the coil assembly. When the coil assembly reaches its limit, the drive circuit adjusts the direction or intensity of the current to alter its direction or speed, combining this with the buffer structure to mitigate impact.

[0070] Compared with existing technologies, in which the drive circuit only implements unidirectional current output and cannot dynamically adjust drive parameters based on the motion state, resulting in insufficient motion control accuracy. This solution introduces a closed-loop feedback mechanism, enabling the drive circuit to respond to changes in coil position in real time and dynamically adjust the drive current, thereby improving motion control accuracy.

[0071] Through the above technical solution, the present application can achieve precise control of the movement of the coil assembly, reduce the risk of collision caused by movement overshoot or response delay, reduce component wear, and extend the service life of the voice coil motor.

[0072] This application further proposes a method for preparing a voice coil motor structure with a buffering function. The present invention also provides a preparation method, and the specific steps are as follows:

[0073] S1: Prepare the various components of the voice coil motor, including the housing, coil assembly, and magnetic circuit system. These components can be customized or purchased based on design requirements. The coil assembly has a coil count ranging from 50 to 500 turns, with a wire diameter ranging from 0.05mm to 0.5mm. The permanent magnets of the magnetic circuit system are made of neodymium iron boron material, with a remanence strength ranging from 1.2T to 1.4T.

[0074] S2: Select appropriate cushioning materials and prepare them into a cushioning structure that matches the VCM's main moving parts according to the design requirements. The cushioning material selection should consider factors such as its elasticity, wear resistance, corrosion resistance, and compatibility with the VCM's main material. The cushioning structure can be prepared using molding, cutting, or bonding methods. The molding temperature range is 80°C to 150°C, and the pressure range is 5MPa to 20MPa.

[0075] S3: Install the buffer structure onto the corresponding position of the voice coil motor body, ensuring a tight fit. Installation methods include bonding, clamping, or threading. Adhesion uses epoxy resin adhesive with a curing temperature range of 60°C to 120°C and a curing time range of 1 hour to 5 hours. Clamping uses a snap-fit ​​structure with a thickness range of 0.5mm to 2mm. Threaded connections use screws with specifications of M2 to M5 and a thread depth range of 3mm to 10mm.

[0076] S4: Assemble the remaining components of the voice coil motor body to form a complete voice coil motor structure. During the assembly process, pay attention to the fit accuracy and installation sequence between the components. The tolerance range of the fit accuracy is ±0.01mm to ±0.05mm.

[0077] S5: Performance testing and debugging of the voice coil motor components, including buffering, motion, and stability testing. The buffering test uses an impact tester with an energy range of 0.1J to 1J; the motion test uses a displacement sensor with a measurement range of ±0.1mm to ±5mm; and the stability test uses a vibration table with a frequency range of 10Hz to 1000Hz and an amplitude range of 0.1mm to 1mm.

[0078] Specifically, the manufacturing process begins with the machining and pretreatment of the voice coil motor's main components. The buffer structure is then customized based on the shape and size of the moving parts, such as by forming a mold or cutting a cushion or unit. During installation, the buffer structure is secured to the housing or magnetic circuit system at a predetermined position using adhesives or mechanical fastening methods, and the fitting tolerances between the components are adjusted using high-precision assembly equipment. After assembly, impact, displacement, and vibration testing are performed sequentially to ensure that the buffer structure can effectively absorb motion shock and maintain smooth motor operation.

[0079] Compared to existing technologies, traditional manufacturing methods often lack systematic regulation of the cushioning structure's installation accuracy and testing procedures, resulting in poor matching between cushioning components and moving parts, which can easily lead to secondary vibrations due to assembly errors. This method, by controlling machining accuracy, installation fit, and testing parameters in stages, forms a complete manufacturing and verification system. This effectively avoids cushioning failures caused by process deviations while simplifying the assembly process for complex cushioning components.

[0080] Through the above technical solution, this application solves the problem of complex installation and unstable effect of the buffer structure in the preparation process of traditional voice coil motors. By optimizing the processing precision control, installation process and testing methods, efficient matching of buffer elements and moving parts is achieved, thereby improving the buffering performance and service life of the voice coil motor under high-speed motion conditions.

[0081] Specifically, when preparing the buffer structure, the mold forming process precisely controls the temperature and pressure parameters to ensure that the elastic material is evenly filled and shaped in the mold, avoiding thermal decomposition of the material due to excessive temperature or molding defects caused by insufficient pressure. The bonding process forms a high-strength bonding layer through the chemical cross-linking reaction of the epoxy resin glue during the curing stage. The matching of curing temperature and time can avoid brittleness or incomplete curing of the adhesive layer. The snap-fit ​​process uses the deformation ability of the elastic snap to achieve rapid assembly. The thickness range of the snap can withstand the impact load of the moving parts while avoiding assembly difficulties caused by excessive thickness. The threaded connection achieves detachable fixation through standardized screw specifications. The thread depth range ensures the effective engagement length of the screw and the component to prevent loosening and falling off.

[0082] In some specific embodiments, mold molding can adopt segmented temperature control technology, for example, low temperature and high pressure are used in the material filling stage, and high temperature and low pressure are switched to in the shaping stage; the bonding process can adopt gradient temperature curing, for example, after pre-curing at 60°C, the temperature is gradually increased to 120°C to complete the final curing; the snap-fit ​​structure can be designed as a symmetrically distributed multi-point snap-fit ​​form, for example, four snap-fit ​​points are evenly arranged around the circumference of the buffer structure.

[0083] Compared with existing technologies, existing buffer structure manufacturing processes typically use a single molding method and lack process parameter optimization, resulting in low yields or insufficient structural strength. This solution improves material molding quality by limiting the temperature and pressure ranges of mold molding. By combining multiple installation methods and optimizing parameters, it simplifies the assembly process and improves connection reliability. Furthermore, while existing buffer structure performance testing methods are relatively simple, this solution comprehensively verifies buffer performance and structural stability through multi-dimensional testing using impact testing machines, displacement sensors, and vibration tables.

[0084] Through the above-mentioned technical solution, this application solves the problems of unstable molding quality, limited installation methods, and insufficient connection reliability in traditional buffer structure manufacturing processes. Optimizing mold molding parameters ensures the dimensional accuracy and material property consistency of the buffer structure. A variety of installation methods can be flexibly selected based on actual needs and improve assembly efficiency. Clearly defined process parameters provide an operational basis for production quality control, ultimately achieving efficient production and long-term stable operation of voice coil motor buffer structures.

[0085] Among them, the impact testing machine refers to a device used to simulate the instantaneous impact load that the voice coil motor is subjected to during movement. Specifically, it can simulate the impact intensity under different working conditions by adjusting the impact energy parameters, thereby verifying the buffer structure's ability to absorb collision energy.

[0086] A displacement sensor is a device used to detect the displacement changes of the moving parts of a voice coil motor. Specifically, it can evaluate the effectiveness of the buffer structure in maintaining motion accuracy by measuring the deviation between the actual displacement of the moving parts and the theoretical displacement.

[0087] A vibration table refers to a mechanical vibration platform that can generate controllable frequency and amplitude. Specifically, by setting vibration parameters, it can simulate the operating state of a voice coil motor in a complex vibration environment and verify the buffer structure's ability to suppress continuous vibration.

[0088] Specifically, in the buffering performance test, the impact testing machine can detect the deformation recovery characteristics of the buffer pad and buffer unit under instantaneous impact by applying an impact load within a specific energy range; in the motion performance test, the displacement sensor can analyze the compensation effect of the buffer spring on the displacement deviation of the moving parts by capturing the actual motion trajectory of the coil assembly; in the stability test, the vibration table can verify the supporting effect of the buffer structure on the overall stability of the system at different frequencies and amplitudes by covering wide-band vibration conditions.

[0089] Compared to existing technologies, traditional testing methods typically only validate a single performance indicator, such as evaluating cushioning effectiveness solely through impact or vibration testing, while lacking comprehensive testing of motion accuracy and dynamic stability. This solution, by introducing multi-dimensional testing methods, can systematically evaluate the comprehensive performance of cushioning structures under the coupled effects of impact, motion, and vibration, providing more comprehensive data support for optimizing cushioning structure design.

[0090] Through the above technical solution, this application can effectively verify the reliability of the buffer structure under complex working conditions, ensure that the voice coil motor reduces component wear and loosening caused by collision and vibration during long-term operation, and at the same time improve the accuracy of motion control and system stability.

[0091] It should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A voice coil motor structure with a buffering function, characterized in that: The invention comprises a voice coil motor body and a buffer structure. The voice coil motor body comprises a shell, a coil assembly and a magnetic circuit system. The coil assembly comprises a coil frame and a coil wound on the coil frame. The magnetic circuit system comprises a permanent magnet. The buffer structure is arranged on at least one moving part of the voice coil motor body and is used to provide a buffering effect when the voice coil motor moves to reduce collision and vibration. The buffer structure comprises a buffer pad, a buffer unit and a buffer spring.

2. The voice coil motor structure with a buffering function according to claim 1, wherein: The buffer pad is made of an elastic material selected from rubber, silicone or polyurethane, and the thickness of the buffer pad ranges from 0.5 mm to 3 mm.

3. The voice coil motor structure with a buffering function according to claim 2, characterized in that: The buffer pad is arranged on the outer periphery of the coil assembly or the inner side of the magnetic circuit system, and is used to provide buffering between the coil assembly and the magnetic circuit system.

4. The voice coil motor structure with a buffering function according to claim 1, wherein: The buffer unit is cylindrical, fan-shaped or wedge-shaped, and is made of an elastic material selected from rubber, silicone, polyurethane or spring steel, with a hardness range of Shore hardness A30 to A90.

5. The voice coil motor structure with a buffering function according to claim 4, wherein: A plurality of grooves are arranged on the surface of the buffer unit, wherein the groove depth ranges from 0.2 mm to 1 mm and the width ranges from 0.5 mm to 2 mm, and the grooves are evenly distributed along the axis direction of the buffer unit.

6. The voice coil motor structure with a buffering function according to claim 1, wherein: The buffer spring is connected to the moving part of the voice coil motor body. The buffer spring is made of spring steel, with a diameter ranging from 0.2 mm to 1 mm, a number of turns ranging from 3 to 10 turns, and a free length ranging from 5 mm to 20 mm.

7. The voice coil motor structure with a buffering function according to claim 1, wherein: The device also includes a driving circuit for driving the coil assembly to move. The driving circuit is electrically connected to the coil assembly and is used to control the movement of the coil assembly.

8. A method for preparing a voice coil motor structure with a buffering function according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: Prepare the various components of the voice coil motor body, including the housing, coil assembly and magnetic circuit system; S2: Select the buffer material and prepare it into a buffer structure that matches the main moving parts of the voice coil motor according to the design requirements; S3: Install the buffer structure to the corresponding position of the voice coil motor body to ensure a tight fit; S4: Assemble other components of the voice coil motor body to form a complete voice coil motor structure, where the tolerance range of the fitting accuracy is ±0.01mm to ±0.05mm. S5: Perform performance testing and debugging on voice coil motor components, including buffer performance testing, motion performance testing, and stability testing.

9. The preparation method according to claim 8, wherein When preparing the buffer structure, mold forming, cutting or bonding methods are adopted, among which the mold forming temperature range is 80℃ to 150℃, and the pressure range is 5MPa to 20Mpa; the installation method of the buffer structure and the voice coil motor body includes bonding, clamping or threaded connection, among which epoxy resin glue is used for bonding, the curing temperature range is 60℃ to 120℃, and the curing time range is 1 hour to 5 hours; the clamping adopts a snap-on structure, and the thickness of the snap is in the range of 0.5mm to 2mm; the threaded connection adopts screws of specifications M2 to M5, and the thread depth range is 3mm to 10mm.

10. The preparation method according to claim 8, characterized in that The buffering performance test uses an impact testing machine with an impact energy range of 0.1J to 1J; the motion performance test uses a displacement sensor with a measurement range of ±0.1mm to ±5mm; the stability test uses a vibration table with a vibration frequency range of 10Hz to 1000Hz and an amplitude range of 0.1mm to 1mm.

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