Driving unit, driving device, camera module and driving unit preparation method

Abstract

This invention relates to a driving unit, a driving device, a camera module, and a method for manufacturing the driving unit. The driving unit, used to drive optical elements, includes a substrate, a coil, a magnet, and a magnetic component. The coil is fixed to the substrate, and the coil and magnet are spaced apart along a first direction. The center of the magnet is located on a second bias side of the coil's center. When the coil is energized, it can drive the magnet to move relative to the coil. The magnetic component is fixed to the coil and / or the substrate, and its center is located on a first bias side of the coil's center to enhance the driving force between the portion of the coil on the first bias side and the magnet. The first bias side and the second bias side are opposite sides of the coil's center along a third direction, which is perpendicular to the first direction. The magnetic component increases the driving force generated by the coil on the first bias side, thus symmetrically controlling the driving force on both sides of the coil.

Description

Technical Field

[0001] This invention relates to the technical field of camera modules, and in particular to a driving unit, driving device, camera module, and method for manufacturing the driving unit. Background Technology

[0002] Camera modules have become standard in electronic devices such as smartphones, tablets, and wearable devices. To ensure image quality, camera modules need to integrate functions such as optical autofocus (AF), optical image stabilization (OIS), or optical zoom. The realization of any of these functions relies on a motor driving the lens assembly or image sensor to make micro-displacements or rotations in at least one direction.

[0003] The current mainstream solution in the market is the voice coil motor (VCM), which uses the Lorentz force between an energized coil and a magnet to generate driving force. However, due to limitations in the internal space layout of the module, some current voice coil motor designs often result in the coil and magnet not being strictly aligned, i.e., they are offset. This asymmetrical arrangement of the coil and magnet leads to uneven magnetic field distribution within the action surface, resulting in asymmetrical driving force generated by the coil on the magnet. This, in turn, reduces the accuracy of motor motion control, increases power consumption, and may cause relative deflection between the coil and magnet. Summary of the Invention

[0004] Based on this, it is necessary to address the problem that the driving force is asymmetrical when the coil and magnet are biased in the current motor, which leads to a decrease in motor motion accuracy and the possibility of relative deflection between the coil and magnet. A driving unit, driving device, camera module and driving unit preparation method should be provided that can make the driving force symmetrical by compensating for the magnetic field strength of the coil.

[0005] This application first provides a driving unit for driving optical elements, including a substrate, a coil, a magnet and a magnetic component. The coil is fixed to the substrate, and the coil and the magnet are spaced apart along a first direction. The center of the magnet is located on a second bias side of the center of the coil. When the coil is energized, it can drive the magnet to move relative to the coil.

[0006] The magnetic element is fixed to the coil and / or the substrate, and the center of the magnetic element is located on the first bias side of the center of the coil to enhance the driving force between the portion of the coil located on the first bias side and the magnet.

[0007] Wherein, the first bias side and the second bias side are two opposite sides of the coil center along a third direction, and the third direction is perpendicular to the first direction.

[0008] In one embodiment, the magnetic element includes permanent magnet material and / or soft magnetic material.

[0009] In one embodiment, the magnetic component is a magnetic adhesive layer, which includes an adhesive layer matrix and magnetic fillers distributed within the adhesive layer matrix.

[0010] In one embodiment, the substrate has a protrusion and / or a recess located within the accommodating cavity on its surface along the first direction, the protrusion being located on the second bias side of the center of the coil, and the recess being located on the first bias side of the center of the coil.

[0011] In one embodiment, the magnetic element is located entirely on the first bias side at the center of the coil.

[0012] In one embodiment, the coil is annular to form a receiving cavity between the inner wall of the coil and the substrate; the dimension of the magnetic element along the third direction accounts for 10% to 40% of the dimension of the receiving cavity along the third direction.

[0013] In one embodiment, a portion of the magnetic element is located on the second bias side at the center of the coil.

[0014] In one embodiment, the coil is annular to form a receiving cavity between the inner wall of the coil and the substrate; the dimension of the magnetic element along the third direction accounts for 60% to 90% of the dimension of the receiving cavity along the third direction.

[0015] In one embodiment, the magnetic element is in contact with the inner wall of the accommodating cavity.

[0016] In one embodiment, the magnet has two or more magnetic poles on the side facing the coil, the direction of the magnetic poles on the side facing the coil is parallel to a second direction, and the direction of movement of the magnet relative to the coil is parallel to the second direction; wherein, the second direction is perpendicular to the first direction and the third direction.

[0017] In one embodiment, the magnetic element is symmetrically arranged on both sides along the third direction.

[0018] In one embodiment, the magnetic element decreases in cross-sectional area perpendicular to the third direction toward the second bias side.

[0019] In one embodiment, the drive unit further includes a position sensor fixed to the substrate and located outside the coil, and the position sensor is located on the second bias side of the coil.

[0020] In one embodiment, the projection of the magnetic element along the first direction is entirely within the projection range of the coil.

[0021] This application also provides a driving device for driving an optical element, including a first frame, a second frame, a driving component, a support member, and the driving component; wherein, the first frame carries the optical element, the support member is disposed between the first frame and the second frame and is used to movably suspend the first frame in the second frame; the driving component includes the aforementioned driving unit and is configured to drive the first frame to move relative to the second frame.

[0022] This application also provides a camera module, including an optical lens, a photosensitive module, and the aforementioned driving device; the optical lens is disposed in one of the first frame or the second frame, and is used to receive and emit light along its own optical axis; the photosensitive module is disposed in the other of the first frame or the second frame, and is used to receive the light emitted by the optical lens for imaging.

[0023] This application also provides a method for fabricating a driving unit, including the following steps:

[0024] a. Fix the coil to the substrate to form an accommodating cavity between the inner wall of the coil and the substrate;

[0025] b. Apply a magnetic element into the accommodating cavity such that the center of the magnetic element is located on the first bias side of the coil center;

[0026] c. The substrate and the magnet are spaced apart on two frames along a first direction, such that the coil and the magnet are spaced apart along the first direction, and the center of the magnet is located on a second bias side of the center of the coil, wherein the first bias side and the second bias side are two opposite sides of the center of the coil along a third direction, and the third direction is perpendicular to the first direction.

[0027] The aforementioned driving unit, by setting a magnetic component with its center facing the first bias side within the coil's accommodating cavity, can increase the magnetic field strength of the portion of the coil near the first bias side by forming a high-permeability channel or magnetic circuit coupling method. This compensates for the weak magnetic field environment of that portion of the coil, thereby increasing the driving force generated by that portion of the coil. This makes the driving force of the two portions of the coil located on the first bias side and the second bias side symmetrical, thereby improving the motion control accuracy of the driving unit, preventing relative deflection, and improving the stability of the motion plane. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the first embodiment of the driving unit of this application;

[0029] Figure 2 for Figure 1 A schematic diagram showing the hidden magnet;

[0030] Figure 3A for Figure 2 The front view;

[0031] Figure 3B The first embodiment of the driving unit of this application is along Figure 3A A cross-sectional view along the AA direction;

[0032] Figure 4 for Figure 1 An exploded view from another angle;

[0033] Figure 5A This is a front view of the driving unit according to the second embodiment of this application after the magnet is hidden;

[0034] Figure 5B The second embodiment of the driving unit of this application is along Figure 5A Cross-sectional view along the BB direction;

[0035] Figure 6A This is a front view of the driving unit according to the third embodiment of this application after the magnet is hidden;

[0036] Figure 6B The third embodiment of the driving unit of this application is along Figure 6A A cross-sectional view along the CC direction;

[0037] Figure 7A This is an exploded view of the driving unit in the fourth embodiment of this application;

[0038] Figure 7B This is a cross-sectional view of the fourth embodiment of the driving unit of this application;

[0039] Figure 8A This is a front view of the driving unit in the fifth embodiment of this application after the magnet is hidden;

[0040] Figure 8B The fifth embodiment of the driving unit of this application is along Figure 8A A cross-sectional view along the DD direction;

[0041] Figure 9 This is a front view of the driving unit according to the sixth embodiment of this application after the magnet is hidden;

[0042] Figure 10 This is a cross-sectional view of the seventh embodiment of the driving unit of this application;

[0043] Figure 11 This is a perspective view of the camera module of this application;

[0044] Figure 12 This is a perspective view of the drive device of this application;

[0045] Figure 13 for Figure 12An exploded view showing the optical lens hidden behind the lens.

[0046] Figure 14 for Figure 13 A three-dimensional view of the third frame from a low angle.

[0047] Reference numerals: 1. Optical lens; 2. Photosensitive module; 10. Substrate; 11. Protrusion; 12. Recess; 20. Coil; 21. Receiving cavity; 30. Magnet; 40. Magnetic component; 41. Magnetic adhesive layer; 42. Material reduction hole; 50. Position sensor; 60. Capacitor; 70. Protective layer; 100. First frame; 200. Second frame; 300. Third frame; 411. First coil; 412. First magnet; 421. Second coil; 422. Second magnet; 510. First circuit section; 520. Second circuit section; 531. Circuit connector; 532. Circuit lead-out component; 610. First position sensor; 620. First capacitor; 630. Second position sensor; 640. Second capacitor; 711. First support section; 712. First magnetic attraction section; 721. Second support section; 722. Second magnetic attraction section; 800. Top cover. Detailed Implementation

[0048] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0054] For ease of description, in this application, the relative orientation of the coil 20 and the magnet 30 is defined as the first direction C1, and two directions perpendicular to the first direction C1 and mutually perpendicular are defined as the second direction C2 and the third direction C3, respectively. Both the second direction C2 and the third direction C3 are parallel to the winding plane of the coil 20.

[0055] The two sides of the center of coil 20 along the third direction C3 are defined as the first bias side L1 and the second bias side L2; the center of coil 20 is defined as D1, the center of magnet 30 is defined as D2, and the center of magnetic component is defined as D3. In this application, the center refers to the geometric center of the corresponding component. For components with uniform material, the geometric center is the centroid of the component.

[0056] Please combine Figure 1 , Figure 2 , Figure 3A as well as Figure 3B As shown, this application first provides a driving unit for driving optical elements, including a substrate 10, a coil 20, a magnet 30, and a magnetic element 40. The coil 20 is fixed to the substrate 10, and the coil 20 and the magnet 30 are spaced apart along a first direction C1. The center D2 of the magnet 30 is located on the second bias side L2 of the center D1 of the coil 20. When the coil 20 is energized, it can drive the magnet 30 to move relative to the coil 20. The magnetic element is fixed to the coil 20 and / or the substrate 10. The projection of the magnetic element along the first direction C1 is completely within the projection range of the coil 20, and the center D3 of the magnetic element 40 is located on the first bias side L1 of the center D1 of the coil 20 to enhance the driving force between the portion of the coil 20 located on the first bias side L1 and the magnet 30. The optical elements include, but are not limited to, an optical lens 1, an optical lens assembly, or a photosensitive chip.

[0057] For the driving unit, the magnet 30 itself generates a symmetrical magnetic field in its surrounding space. However, since the center D2 of the magnet 30 is located on the second bias side L2 of the center D1 of the coil 20, that is, the magnet 30 is biased relative to the coil 20 along the third direction C3 towards the second bias side L2, the magnetic field of the magnet at the location of the coil 20 is asymmetrical about the center D1 of the coil 20. Specifically, the larger the volume of the magnet 30, the greater the magnetic field strength it generates. Since the magnet 30 is usually of uniform thickness, when the thickness difference is small, the larger the projected area of ​​the magnet 30, the greater the corresponding magnetic field strength. In this application, along the third direction C3, the projected area of ​​the magnet 30 located on the second bias side L2 of the center D1 of the coil 20 is greater than the projected area of ​​the magnet 30 located on the first bias side L1 of the center D1 of the coil 20. Therefore, the magnetic field received by the half of the coil 20 closest to the second bias side L2 is stronger than the magnetic field received by the half of the coil 20 closest to the first bias side L1.

[0058] Based on this, when coil 20 is energized, according to Lorentz's law, the part closer to the second bias side L2 has a stronger static magnetic field and generates a greater driving force, while the part closer to the first bias side L1 has a weaker static magnetic field and generates a smaller driving force. In other words, the driving forces generated by the two parts of coil 20 are asymmetrical (the driving force of the second bias side L2 is greater), which results in an undesirable eccentric torque in the driving component.

[0059] In this application, a magnetic element 40 with its center facing the first bias side L1 is provided inside the coil 20. The magnetic element 40 can increase the magnetic field strength of the portion of the coil 20 near the first bias side L1 by forming a high permeability channel or magnetic circuit coupling, thereby compensating for the weak magnetic field environment of that portion of the coil 20 and increasing the driving force generated by that portion of the coil 20. This makes the driving forces of the two portions of the coil 20 located on the first bias side L1 and the second bias side L2 symmetrical or nearly symmetrical, thereby improving the motion control accuracy of the driving device, preventing relative deflection, and improving the stability of the motion plane.

[0060] Specifically, on the one hand, the magnetic component can form a high-permeability channel inside the coil 20, allowing the magnetic flux generated after the coil 20 is energized to preferentially close through this channel, reducing the travel distance and leakage loss of the magnetic flux in the air. Thus, under the same input current conditions, the strength of the coil's magnetic field within the working air gap is effectively increased. On the other hand, the magnetic component can also provide a low-resistance bypass for the magnetic flux through magnetic circuit coupling, guiding and converging the magnetic flux that would otherwise diffuse into the surrounding space into the working air gap, thereby increasing the magnetic field strength within the working air gap. Therefore, under the same current input conditions, the magnetic component, through the dual effects of enhancing the coil's magnetic field and converging the magnetic field of the magnet, effectively increases the total magnetic field strength generated by the coil 20 and the magnet 30 within the working air gap, thereby effectively increasing the driving force generated between the coil 20 and the magnet 30.

[0061] The working air gap refers to the air gap between the magnet 30 and the coil 20 where energy conversion actually occurs. In other words, it is the effective area where the magnetic field of the coil 20 interacts with the magnetic field of the magnet to generate driving force after the coil 20 is energized.

[0062] Furthermore, since the projection of the magnetic component along the first direction C1 is entirely within the projection range of the coil 20 (i.e., the outer contour of the coil 20), the magnetic component can be placed in the coil to fill the original unused space inside the coil 20 without occupying additional volume. This allows for an increase in the driving force of the driving unit while maintaining the same or even smaller volume. Simultaneously, while achieving the same driving force, the size or number of turns of the coil 20 can be reduced by incorporating the magnetic component, thereby reducing the overall size and weight of the driving unit to some extent.

[0063] In addition, the magnetic component has magnetism, and the magnetic attraction or repulsion force generated between it and the magnet 30 can increase or decrease the clamping force between the coil 20 and the frame containing the magnet 30, so as to adjust the clamping force between the frames.

[0064] It is worth mentioning that the coil 20 and the magnet 30 are spaced apart, and there is an air gap between the coil 20 and the magnet 30 to prevent interference between the magnet 30 and the coil 20 during the operation of the drive unit. Furthermore, the magnetic component and the magnet 30 are also spaced apart, and there is also an air gap between the magnetic component and the magnet 30.

[0065] In some embodiments, the coil 20 is fixed to the side of the substrate 10 close to the magnet 30 along the first direction C1, and the substrate 10 and the magnet 30 are also spaced apart along the first direction C1.

[0066] In some embodiments, when the coil 20 is energized, it can drive the magnet 30 to move relative to the coil 20 in a direction perpendicular to the first direction C1 (e.g., along the second direction C2 or along the third direction C3); in other embodiments, when the coil 20 is energized, it can drive the magnet 30 to move relative to the coil 20 in the first direction C1.

[0067] In some embodiments, the magnetic component 40 includes permanent magnet material and / or soft magnetic material.

[0068] Among them, the magnetic components of the permanent magnet material can guide and converge the magnetic flux of the magnet that originally diffused into the surrounding space, so that the magnetic field strength on the first bias side L1 of the coil 20 is increased to a level close to that on the second bias side L2, thereby increasing the driving force generated by this part of the coil 20 and achieving force balance with the second bias side L2.

[0069] The magnetic components made of soft magnetic materials can not only serve as high-permeability channels to effectively enhance the strength of the magnetic field of the coil in the working air gap, but also serve as magnetic field line guiding channels to orient the original magnetic field generated by the magnet 30 to the weak magnetic field region of the first bias side L1. This creates a low magnetic resistance path (magnetic circuit coupling) on ​​the first bias side L1, significantly increasing the magnetic flux density on the first bias side L1. This increases the Lorentz force on the first bias side L1 of the coil 20, thereby reducing or even canceling the asymmetry caused by the bias.

[0070] Please combine Figure 2 , Figure 3A , Figure 3B as well as Figure 4As shown, in some embodiments, the coil 20 is formed by winding a wire along a winding plane perpendicular to the first direction C1. The coil 20 is annular, and the annular coil 20 has an inner annular wall and an outer annular wall in the radial direction. The inner annular wall and the substrate 10 surround and form a receiving cavity 21. The magnetic element 40 is a magnetic adhesive layer 41, which is disposed in the receiving cavity 21 and / or in the gaps between the wires in the coil 20.

[0071] With this configuration, whether the magnetic adhesive layer 41 is placed inside the accommodating cavity 21 or in the gap between the wires, the unused space at the location of the coil 20 can be fully utilized, avoiding additional volume occupation.

[0072] Specifically, if the magnetic adhesive layer 41 is placed inside the accommodating cavity 21, it can form a high magnetic permeability channel inside the coil 20 or provide a low magnetic resistance bypass for the magnetic flux of the magnet through magnetic circuit coupling; if the magnetic adhesive layer 41 is placed in the gap between the wires, its fine filling can help reduce magnetic field leakage, optimize the magnetic field path, and help optimize the magnetic field of the coil 20.

[0073] More specifically, the coil 20 has a preset thickness along the first direction C1, which is perpendicular to the winding plane of the coil 20; the coil 20 has two leads, which are respectively soldered to two coil pads on the substrate 10 to make the coil 20 electrically connected to the substrate 10, wherein the coil pads are two spaced pads on the substrate 10.

[0074] In some embodiments, the magnetic adhesive layer 41 includes an adhesive layer matrix and magnetic fillers uniformly distributed within the adhesive layer matrix.

[0075] The magnetic adhesive layer 41 is obtained by curing a magnetic adhesive liquid. The magnetic adhesive liquid includes an adhesive liquid and magnetic fillers uniformly dispersed in the adhesive liquid. After the magnetic adhesive liquid is applied to the substrate 10, the magnetic adhesive layer 41 is obtained by curing the magnetic adhesive liquid and fixing it to the substrate 10.

[0076] Furthermore, in some embodiments, the magnetic filler includes soft magnetic powder and / or permanent magnetic powder.

[0077] The magnetic adhesive layer 41, which contains permanent magnet powder, can be magnetized according to the magnetic field direction of the magnet 30, so as to ensure that the magnetic field direction of the magnetic adhesive layer 41 is completely parallel and in the same direction as the magnetic field of the magnet 30.

[0078] It is worth mentioning that the magnetic adhesive layer 41 has high structural plasticity. If other permanent magnets with fixed structures and shapes (such as magnets) are set inside the coil 20, the process of accurately magnetizing a specific direction of magnetic field in a precise and tiny structure (such as a voice coil motor) is extremely difficult. If the magnetization is not based on the magnetic field of magnet 30, the newly added permanent magnet, as a new magnetic field source, will disrupt the original magnetic circuit balance of magnet 30 and interfere with the original magnetic field distribution of magnet 30, thereby leading to a decrease in magnetic field strength or even failure.

[0079] In addition, permanent magnet powder is difficult to demagnetize and has high coercivity. It maintains a magnetic field for a long time after being magnetized once. Therefore, the magnetic adhesive layer 41 with permanent magnet powder is suitable for generating magnetic attraction or repulsion with the magnet 30. Thus, the magnetic attraction or repulsion between the magnetic adhesive layer 41 and the magnet 30 can be used to increase or decrease the clamping force between the coil 20 and the frame containing the magnet 30.

[0080] Specifically, the permanent magnet powder can be implemented as one or a combination of NdFeB powder, AlNiCo powder, ferrite permanent magnet powder, etc.

[0081] The magnetic adhesive layer 41, which contains soft magnetic powder, has high magnetic permeability. On the one hand, it can form a high-permeability channel inside the coil 20, so that the magnetic flux generated after the coil 20 is energized will preferentially close through this channel, reducing the travel distance of the magnetic flux in the air and the leakage loss. On the other hand, it can also provide a low magnetic resistance bypass for the magnetic flux of the magnet through magnetic circuit coupling, so that the magnetic flux of the magnet that originally diffused into the surrounding space is guided and converged into the working air gap, thereby increasing the magnetic field strength of the magnet in the working air gap, and thus achieving the effect of increasing the driving force between the coil 20 and the magnet 30.

[0082] Meanwhile, the magnetic adhesive layer 41, which contains soft magnetic powder, can make the magnetic field of the coil 20 more stable and uniform, thereby reducing magnetic field fluctuations and noise, and improving the stability and accuracy of the drive unit operation.

[0083] It is worth mentioning that, compared to other soft magnetic components with fixed structures and shapes placed inside the coil 20, most of them are difficult to perfectly fit the complex, narrow, and irregular space inside the coil 20, thus failing to make full use of the space. At the same time, the existence of gaps will also affect the magnetic field converging efficiency and weaken the magnetic field enhancement effect. However, the magnetic adhesive layer 41 of this application is formed by curing liquid magnetic adhesive, which can seamlessly fill the internal space of the coil 20, thereby making full use of the internal space of the coil 20 while achieving excellent magnetic field enhancement effect.

[0084] In addition, soft magnetic powder has the characteristics of easy magnetization, easy demagnetization, low coercivity and high permeability; therefore, the magnetic adhesive layer 41 has good permeability and is suitable for generating magnetic attraction with the magnet 30, thereby enhancing the clamping force between the coil 20 and the frame containing the magnet 30.

[0085] Specifically, the soft magnetic powder can be implemented as one or a combination of nickel-iron soft magnetic alloy powder, low carbon steel powder, 430 stainless steel powder, iron oxide powder, etc.

[0086] It should be understood that in some other embodiments, the magnetic filler can be unevenly distributed in the adhesive matrix to control the magnetic attraction / repulsion at different positions of the magnetic adhesive layer 41, thereby achieving precise control of the clamping force between the frame containing the coil 20 and the magnet 30.

[0087] Furthermore, in some embodiments, the magnetic filler accounts for 1wt% to 30wt% of the magnetic adhesive layer 41.

[0088] This setup ensures that the density of the magnetic filler is sufficient to form an effective magnetic conductive path, while avoiding the deterioration of the fluidity of the adhesive matrix due to excessive filler.

[0089] Specifically, if the proportion of magnetic filler is too low, the magnetic resistance of the magnetic circuit cannot be significantly reduced, and the driving force improvement effect is weak; conversely, if the proportion of magnetic filler is too high, on the one hand, it will reduce the fluidity of the magnetic adhesive, which may make it difficult for the magnetic adhesive layer 41 to fill the internal space of the coil 20 well, resulting in incomplete filling or the generation of air bubbles.

[0090] Furthermore, in some embodiments, the adhesive layer substrate is an insulating material. Since the coil 20 carries a driving current, using an insulating material as the adhesive layer substrate can prevent the formation of conductive paths, thereby avoiding leakage or short circuits in the coil 20 due to conductivity of the magnetic adhesive layer 41. Therefore, ensuring that the proportion of magnetic filler in the magnetic adhesive layer 41 is less than or equal to 30 wt% also helps maintain the electrical insulation of the magnetic adhesive layer 41.

[0091] Further, please refer to Figure 7A as well as Figure 7B As shown, in some embodiments, the drive unit further includes a protective layer 70, which is fixed to the magnetic adhesive layer 41 and covers the exposed surface of the magnetic adhesive layer 41.

[0092] This design physically isolates the magnetic filler inside the magnetic adhesive layer 41 from the outside world, preventing powder from falling off and entering the drive unit due to long-term use or vibration. This avoids the risk of magnetic filler contaminating optical components from the source and ensures the long-term reliability of the drive unit during precision displacement.

[0093] Specifically, the protective layer 70 is formed by curing the adhesive. The liquid adhesive can completely cover the exposed surface of the magnetic adhesive layer 41 by its own fluidity, so as to ensure that the cured protective layer 70 completely covers the exposed surface of the magnetic adhesive layer 41 and avoids the risk of magnetic filler leakage.

[0094] Furthermore, in some embodiments, the adhesive substrate is black. A black adhesive substrate can efficiently absorb incident light, preventing the magnetic adhesive layer 41 from reflecting stray light into the optical path of the optical element, thereby reducing the risk of stray light.

[0095] Furthermore, in some embodiments, when a protective layer 70 is provided in the driving unit, the protective layer 70 is black. The black protective layer 70 can reduce the risk of stray light. At this time, since the magnetic adhesive layer 41 is covered by the protective layer 70, the adhesive layer substrate can be black or other colors.

[0096] Furthermore, in some embodiments, the magnetic adhesive layer 41 is disposed in the accommodating cavity 21, and the cross-sectional area of ​​the magnetic adhesive layer 41 perpendicular to the first direction C1 gradually decreases towards the side closer to the magnet 30 along the first direction C1.

[0097] It is easy to understand that because the magnetic adhesive layer 41 and at least part of the annular inner wall of the coil 20 are spaced apart and do not directly contact each other, when magnetic adhesive is applied into the accommodating cavity 21, the magnetic adhesive will have a structure that is larger at the bottom and smaller at the top under the action of gravity. This gradient cross-section structure can also reduce the amount of material used on the side of the magnetic adhesive layer 41 close to the magnet 30, thereby reducing the ineffective weight while meeting the magnetic field enhancement requirements and avoiding the impact of redundant mass on the response speed.

[0098] Specifically, the magnetic adhesive layer 41 can be formed by curing after a single application of adhesive, or by curing after multiple applications of adhesive (i.e., applying adhesive again after curing once, and repeating this process multiple times to achieve the required thickness).

[0099] More specifically, the thixotropic ratio of the magnetic adhesive liquid used to cure and form the magnetic adhesive layer 41 is in the range of 3 to 5.

[0100] By controlling the thixotropic ratio of the magnetic adhesive within this range, the slope of the gradient cross-sectional structure of the magnetic adhesive layer 41 formed after curing can be controlled, thereby minimizing the weight of the magnetic adhesive layer 41 while ensuring that the magnetic induction intensity enhancement effect of the magnetic adhesive layer 41 meets the requirements.

[0101] The thixotropic ratio (H / W) refers to the ratio of the initial height (H) of the extruded adhesive stacked into a cylindrical or elongated shape to the lateral spreading width (W) of the extruded adhesive after standing for 180 seconds. The test conditions for the above thixotropic ratio range are a temperature of 25°C and a humidity of 50%.

[0102] In some other embodiments, the magnetic element 40 may also be a magnet or other magnetic element, as long as it can enhance the driving force between the portion of the coil 20 located on the first bias side L1 and the magnet 30. This application will not provide examples of each of these.

[0103] Please combine Figure 2 , Figure 3A as well as Figure 3B As shown, in some embodiments, the magnetic element is in contact with the annular inner wall of the accommodating cavity 21. The physical contact between the magnetic element 40 and the annular inner wall of the coil 20 achieves the following effects:

[0104] Firstly, it can reduce or even eliminate the gap between the magnetic component 40 and the coil 20, thereby maximizing the volume of the magnetic component 40 and improving its effectiveness. Secondly, when the magnetic component 40 is made of soft magnetic material, eliminating the gap through contact can ensure efficient connection between the magnetic circuit channel and the low magnetic resistance path of the magnetic component 40, thereby improving the efficiency and density of magnetic field lines.

[0105] Secondly, the magnetic component 40 is in contact with and fixed to both the inner wall of the coil 20 and the substrate 10, which increases the fixing area of ​​the magnetic component 40 and the fixing reliability of the coil 20, thereby enhancing the structural stability and reliability during dynamic movements such as focusing and image stabilization.

[0106] Thirdly, the physical contact between the magnetic component 40 and the coil 20 also helps dissipate heat when the coil 20 is working, thereby improving the heat dissipation effect of the drive unit.

[0107] In some other embodiments, the magnetic element 40 and the annular inner wall of the coil 20 are spaced apart. This arrangement, by maintaining a physical gap between the magnetic element 40 and the coil 20, isolates the magnetic element 40 from direct contact with the coil 20, thus avoiding the risk of short circuits.

[0108] Please refer to Figure 5A as well as Figure 5B As shown, in some embodiments, the magnetic element 40 is located entirely on the first bias side L1 of the center D1 of the coil 20.

[0109] By confining the magnetic component 40 to the first bias side L1, which is completely located at the center D1 of the coil 20, the magnetic component 40 acts only on the area requiring compensation. This enhances the effective magnetic field strength of the coil 20 in that area and increases the driving force of the first bias side L1. Simultaneously, the magnetic component 40 is strictly confined to the first bias side L1, preventing excessive enhancement of the originally stronger second bias side L2. This ensures that the driving forces of the first bias side L1 and the second bias side L2 of the coil 20 are ultimately symmetrical, thereby reducing or even eliminating the eccentric torque caused by uneven driving forces, improving the motion accuracy of the magnet 30, and suppressing the risk of relative deflection between the coil 20 and the magnet 30.

[0110] Furthermore, in some embodiments, the dimension of the magnetic element 40 along the third direction C3 accounts for 10% to 40% of the dimension of the accommodating cavity 21 along the third direction C3. This dimension range achieves better compensation for the magnetic field of the first bias side L1 within a limited space.

[0111] Specifically, a lower limit of 10% ensures that the magnetic component 40 has sufficient volume to form an effective magnetic circuit, which can fully attract and guide the magnetic flux of the magnet 30 to the coil 20 region on the first polarization side. If it is less than 10%, the volume of the magnetic component is too small, the magnetic field enhancement effect is weak, and it cannot balance the strong driving force of the second bias side L2.

[0112] The upper limit of 40% can prevent the magnetic component 40 from occupying too much space in the cavity 21, which would cause structural interference. At the same time, it can prevent the magnetic component 40 from overcompensating due to magnetic saturation or excessive magnetic field coupling (i.e., the driving force of the first bias side L1 exceeds that of the second driving side).

[0113] Please combine Figure 3A , Figure 3B , Figure 6A as well as Figure 6B As shown, in some embodiments, a portion of the magnetic element 40 is located on the second bias side L2 of the center D1 of the coil 20. Specifically, the volume of the portion of the magnetic element 40 located on the first bias side L1 of the coil 20 is larger than the volume of the portion located on the second bias side L2 of the coil 20, to ensure that the center of the magnetic element 40 is located on the first bias side L1 of the coil 20.

[0114] Because magnet 30 is biased on the second bias side L2, its magnetic field is weaker on the first bias side L1 of coil 20 and stronger on the second bias side L2. By partially placing the magnetic component 40 on the second bias side L2, it is only necessary to ensure that the volume of the portion of magnetic component 40 on the first bias side L1 is larger than that on the portion on the second bias side L2. This ensures that the driving force enhancement effect of magnetic component 40 on the first bias side L1 of coil 20 is greater than that on the second bias side L2 of coil 20, thus achieving the same driving force compensation effect on the first bias side L1 of coil 20.

[0115] Meanwhile, compared to providing the magnetic element 40 only on the first bias side L1, the magnetic element 40 in this embodiment has a larger volume, stronger magnetic attraction and repulsion with the magnet 30, a wider range of adjustment for the clamping force between the coil 20 and the frame containing the magnet 30, and better magnetic attraction and repulsion effects. In addition, when the magnetic element 40 enhances the magnetic field strength on both the first bias side L1 and the second bias side L2, it can also avoid overcompensation caused by an excessive increase in the magnetic field strength on the first bias side L1.

[0116] Furthermore, in some embodiments, the dimension of the magnetic element 40 along the third direction C3 accounts for 60% to 90% of the dimension of the accommodating cavity 21 along the third direction C3.

[0117] Specifically, a lower limit of 60% ensures that the magnetic component 40 covers the second bias side L2 portion; while an upper limit of 90% ensures that there is a volume difference between the magnetic component 40 located on the first bias side L1 portion and the portion located on the second bias side L2 portion, thereby ensuring a driving force compensation effect on the first bias side L1 of the coil.

[0118] Further, please refer to Figure 9 As shown, in some embodiments, the portion of the magnetic element 40 located on the second bias side L2 of the center D1 of the coil 20 has a material reduction hole 42.

[0119] Since the amplification effect of the magnetic component 40 on the driving force is positively correlated with the volume of the magnetic component 40, the volume of the magnetic component 40 in the second bias side L2 portion can be reduced by opening the material reduction hole 42. This makes the volume of the magnetic component 40 in the first bias side L1 portion larger than that in the second bias side L2 portion. The amplification effect of the first bias side L1 portion on the driving force is greater than that in the second bias side L2 portion, thereby achieving compensation and balance of the driving force in the third direction C3. When the magnetic component 40 is a magnetic adhesive layer 41, the opening design does not require increasing the overall thickness. The opening position can be precisely controlled by a template before the magnetic adhesive cures, making the process more adaptable.

[0120] Further, please refer to Figure 10 As shown, in some embodiments, the thickness (dimension along the first direction C1) of the magnetic element 40 located at the center D1 of the coil 20 on the first bias side L1 portion and the second bias side L2 portion are different, and the thickness of the first bias side L1 portion is greater than the thickness of the second bias side L2 portion.

[0121] When the thickness of the magnetic component 40 in the first bias side L1 portion of the coil 20 is large, the volume of the magnetic component 40 on that side is larger, and the amplification effect on the driving force is relatively strong. This asymmetric design achieves compensation and balance of the driving force in the third bias C3.

[0122] Furthermore, please combine Figure 3B as well as Figure 4 As shown, in some embodiments, the substrate 10 is provided with a protrusion 11 and / or a recess 12 located in the accommodating cavity 21 along the surface of the first direction C1. The protrusion 11 is located on the second bias side L2 of the center D1 of the coil 20, and the recess 12 is located on the first bias side L1 of the center D1 of the coil 20.

[0123] By providing the protrusion 11 and / or the recess 12, the volume of the accommodating cavity 21 located on the first bias side L1 and the second bias side L2 can be changed, so that when the magnetic element 40 completely fills the accommodating cavity 21, the volume of the magnetic element 40 located on the first bias side L1 is greater than the volume located on the second bias side L2, thereby achieving compensation and balance of the driving force in the third direction C3.

[0124] For example, when the magnetic component 40 is a magnetic adhesive layer 41, by providing a protrusion 11 on the second bias side L2 of the center D1 of the coil 20, when the magnetic adhesive is applied to the substrate 10, the magnetic adhesive will avoid the position of the protrusion 11, so that after the magnetic adhesive layer 41 is cured, the volume of the magnetic adhesive layer 41 on the second bias side L2 is smaller than that on the first bias side L1, and the magnetic adhesive layer 41 on the first bias side L1 can generate a greater driving force amplification effect.

[0125] Similarly, by providing a recess 12 on the first bias side L1 of the center D1 of the coil 20, when magnetic adhesive is applied to the substrate 10, the recess 12 can additionally accommodate the magnetic adhesive, so that after the magnetic adhesive layer 41 is cured, the volume of the magnetic adhesive layer 41 on the first bias side L1 is larger than that on the second bias side L2, and the magnetic adhesive layer 41 on the first bias side L1 can generate a greater driving force amplification effect.

[0126] Specifically, the protrusion 11 can be integrally formed with the insulating layer (ink layer) on the surface of the substrate 10, or it can be formed separately, for example, by pasting or fixing it to the surface of the substrate 10 after the substrate 10 is manufactured. In one embodiment, the protrusion 11 can be an electronic component such as a sensor, capacitor, resistor, or control chip, thereby reducing the volume of the magnetic component 40 on that side by directly using the electronic component as the protrusion 11.

[0127] Please refer to Figure 3B As shown, in some embodiments, the distance between the magnetic element 40 and the magnet 30 along the first direction C1 is greater than or equal to the distance between the coil 20 and the magnet 30 along the first direction C1, ensuring that the magnetic element 40 does not protrude from the coil 20 on the side closer to the magnet 30 along the first direction C1. Correspondingly, the distance between the magnetic element 40 and the magnet 30 along the first direction C1 is greater than or equal to the distance between the coil 20 and the magnet 30 along the first direction C1. It should be understood that if the magnetic element 40 protrudes from the coil 20 on the side closer to the magnet 30 along the first direction C1, to avoid the risk of interference between the magnetic element 40 and the magnet 30, a certain gap needs to be maintained between the magnetic element 40 and the magnet 30, thereby increasing the distance between the coil 20 and the magnet 30. However, an increased distance between the coil 20 and the magnet 30 leads to a decrease in driving force.

[0128] With this configuration, when the magnet 30 and the coil 20 move relative to each other, the magnetic component 40 will not mechanically interfere with the magnet 30. By avoiding spatial interference, the interference of the magnetic component 40 on the original degree of freedom of movement of the magnet 30 is effectively reduced, thus ensuring driving stability.

[0129] In addition, please combine Figure 7A as well as Figure 7B As shown, when the protective layer 70 is provided in the driving unit, the distance between the protective layer 70 and the magnet 30 along the first direction C1 is greater than or equal to the distance between the coil 20 and the magnet 30 along the first direction C1. That is, the protective layer 70 does not protrude from the coil 20 along the first direction C1, so as to avoid interference between the protective layer 70 and the magnet 30, thereby reducing the influence of the setting of the protective layer 70 on the relative movement between the magnet 30 and the coil 20.

[0130] In some embodiments, the thickness of the magnetic component 40 along the first direction C1 accounts for 50% to 100% of the thickness of the coil 20, so as to make full use of the idle space inside the coil 20 to achieve a balance between efficient magnetic field enhancement and volume control.

[0131] The thickness of the magnetic component 40 is ≥50%, which ensures that the magnetic component 40 has sufficient volume to fill the internal space of the coil 20, guaranteeing the effect of improving the permeability or magnetic field superposition strength, thereby achieving the minimum effective threshold for enhancing the driving force; while the thickness is ≤100%, which avoids the risk of interference with the magnet 30 due to the excessive protrusion of the magnetic component 40.

[0132] In some embodiments, within the range of movement of the magnet 30 relative to the coil 20, the projection of the magnetic element 40 along the first direction C1 is always completely within the magnet 30, so as to ensure that the strengthening effect of the magnetic element 40 on the magnetic field covers the entire movement stroke of the magnet 30, while avoiding the situation where the clamping force distribution between the coil 20 and the frame containing the magnet 30 is greatly offset due to the magnetic element 40 exceeding the range of the magnet 30, which could lead to the frame overturning.

[0133] Preferably, in the initial state, the projection of the coil 20 along the first direction C1 is completely within the range of the magnet 30, that is, the projection of the magnetic element 40 along the first direction C1 is also completely within the range of the magnet 30.

[0134] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, the magnet 30 has two or more magnetic poles on the side facing the coil 20, the direction of the magnetic poles on the side facing the coil 20 is parallel to the second direction, and the direction of movement of the magnet 30 relative to the coil 20 is parallel to the second direction.

[0135] In some embodiments, the magnetic components 40 are symmetrically arranged on both sides along the third direction C3. This symmetrical arrangement improves the symmetry of the driving force of the coil 20, solving the problem of motion jitter or jamming caused by uneven distribution of magnetic driving force.

[0136] Please combine Figure 5A , Figure 5B , Figure 6A as well as Figure 6B As shown, in some embodiments, the cross-sectional area of ​​the magnetic element 40 decreases towards the second bias side L2 along the third direction C3. That is, the volume of the magnetic element 40 exhibits a decreasing gradient distribution along the third direction C3 towards the second bias side L2.

[0137] The magnetic component 40 enhances the magnetic field of the first bias side L1 by providing a high magnetic permeability path, and the gradient decrease in cross-sectional area allows its magnetic field compensation capability to better match the asymmetry of the original magnetic field of the magnet 30 in space. Specifically, the cross-sectional area of ​​the magnetic component is larger near the first bias side L1 (weak magnetic field region), which can gather more magnetic field lines and significantly improve the magnetic field strength in this region. As the position moves towards the second bias side L2 (strong magnetic field region), the cross-sectional area decreases to gradually weaken the compensation strength and avoid over-compensation.

[0138] Preferably, the projection of the end of the magnetic element 40 near the second bias side L2 along the first direction C1 is arc-shaped.

[0139] Please combine Figure 2 as well as Figure 3A As shown, in some embodiments, the drive unit further includes a position sensor 50, which is fixed to the substrate 10 along the first direction C1 near the magnet 30 and is used to detect the movement of the magnet 30 relative to itself; the position sensor 50 is located inside or outside the annular coil 20.

[0140] The position sensor 50 can be arranged inside or outside the coil 20 to meet the needs of different scenarios. Specifically, when the position sensor 50 is arranged inside the coil 20, the unused space at the center D1 of the coil 20 can be utilized to reduce the area of ​​the substrate 10 and achieve miniaturization.

[0141] Furthermore, since the position sensor 50 outputs a displacement signal by detecting changes in the magnetic field of the magnet 30, it is necessary to ensure that the background magnetic field is stable. Therefore, when the position sensor 50 is arranged outside the coil 20, the influence of the magnetic field of the coil 20 can be reduced, the interference of the coil 20 with the position sensor 50 signal can be reduced, thereby improving the sensing accuracy of the position sensor 50.

[0142] Furthermore, in some embodiments, the position sensor 50 is fixed to the substrate 10 and located outside the coil 20, and the position sensor 50 is located on the second bias side L2 of the coil 20, so that the position sensor 50 is away from the magnetic element, reducing the interference of the magnetic element on the signal of the position sensor 50, thereby improving the sensing accuracy of the position sensor 50. In a specific example, the position sensor 50 is disposed outside the coil 20 along the second direction C2.

[0143] It should be understood that in some designs, the position sensor 50 is positioned outside the coil 20 and faces the same magnet 30 as the coil 20, causing the magnet 30 to be biased relative to the coil 20.

[0144] Furthermore, in some embodiments, the driving unit further includes a capacitor 60 fixed to the substrate 10 along the first direction C1 near the magnet 30, with both the capacitor 60 and the position sensor 50 located outside the coil 20. In a specific example, the capacitor 60 is disposed outside the coil 20 along the second direction C2.

[0145] By placing both the capacitor 60 and the position sensor 50 on the outside of the coil 20, it is possible to prevent them from intruding into the interior of the coil 20, thereby increasing the space for the magnetic component 40 to be placed inside the coil 20 and allowing the magnetic component 40 to maintain a relatively large volume.

[0146] Furthermore, in some embodiments, the position sensor 50 is located inside the coil 20 and spaced apart from the magnetic element 40. This arrangement can reduce the volume of the substrate 10 while ensuring the detection accuracy of the position sensor 50, balancing the improvement of driving force and the stability of the detection function within a limited space. Specifically, the spaced arrangement ensures that the position sensor 50 does not come into contact with the magnetic element 40, thereby avoiding distortion of the displacement signal due to the magnetic conduction / magnetization effect of the magnetic element 40. At the same time, the position sensor 50 is arranged inside the coil 20, which utilizes the unused space inside the coil 20, reducing the area of ​​the substrate 10 and achieving miniaturization.

[0147] Furthermore, the magnetic component 40 is arranged at intervals with both the position sensor 50 and the coil 20 to avoid the magnetic component 40 interfering with the normal operation of the position sensor 50 and the coil 20.

[0148] Please refer to Figure 8A as well as Figure 8B As shown, in some other embodiments, the center D3 of the magnetic element 40 is located on the second bias side L2 of the center D1 of the coil 20, so as to further enhance the magnetic field strength at the second bias side L2 of the coil 20 through the magnetic element, thereby further enhancing the driving force of the coil 20 and the magnet 30 on the second bias side L2, so that the driving force on the second bias side L2 becomes the main driving force.

[0149] Furthermore, in some embodiments, the plane containing the center D3 of the magnetic element 40 and the center D2 of the magnet 30 is perpendicular to the third direction C3, that is, the center D3 of the magnetic element 40 and the center D2 of the magnet 30 correspond to each other along the third direction C3, so that the effect of the magnetic element on the magnet 30 is symmetrical along the third direction C3, thereby reducing the influence of the setting of the magnetic element 40 on the magnet 30.

[0150] Please combine Figure 12 as well as Figure 13 As shown, this application also provides a driving device for driving an optical element, including a first frame 100, a second frame 200, a support member, and a driving assembly; wherein, the first frame 100 carries the optical element, the support member is disposed between the first frame 100 and the second frame 200 and is used to movably suspend the first frame 100 on the second frame 200; the driving assembly includes the aforementioned driving unit and is configured to drive the first frame 100 to move relative to the second frame 200.

[0151] The optical element driven by the driving component has an optical axis o. When the optical element is implemented as an optical lens 1, the optical axis o of the optical element is the optical axis o of the optical lens 1, which is the coaxial alignment line of the optical axes o of each lens in the optical lens 1. When the optical element is implemented as a photosensitive chip, the optical axis o of the optical element is the optical axis o of the photosensitive chip, which is the axis perpendicular to the geometric center of the effective imaging area of ​​the photosensitive chip.

[0152] Please combine Figure 12 as well as Figure 13 As shown, in some embodiments, the driving assembly includes at least one first driving unit, the first driving unit including at least one first coil 411 and at least one first magnet 412, the first coil 411 and the first magnet 412 are disposed opposite to each other, the first frame 100 is movably suspended in the second frame 200, the first coil 411 is fixed to one of the first frame 100 and the second frame 200, and the first magnet 412 is fixed to the other of the first frame 100 and the second frame 200.

[0153] Please refer to Figure 13 As shown, in some embodiments, the first coil 411 is fixed to the second frame 200, and the first magnet 412 is fixed to the first frame 100, forming a moving magnet drive structure. After the first coil 411 is energized, the first coil 411 drives the first frame 100 and the first magnet 412 fixed to the first frame 100 to move relative to the second frame 200.

[0154] In the above embodiments, the first magnet 412 moves relative to the first coil 411 along the optical axis o, and the first driving unit drives the first frame 100 to move relative to the second frame 200 along the optical axis o, thereby achieving optical focusing. It should be understood that in other examples of this application, the first driving unit may also drive the first frame 100 to move relative to the second frame 200 in a direction perpendicular to the optical axis o, thereby achieving optical image stabilization.

[0155] In addition, in other examples of this application, the first magnet 412 may also be fixed to the second frame 200, while the first coil 411 may be fixed to the first frame 100, thereby forming a moving coil drive architecture.

[0156] Furthermore, the driving device also includes a conductive component for providing current to the driving component. The conductive component includes a first circuit section 510 for providing current to the first coil 411. The first circuit section 510 is disposed on the side of the first coil 411 away from the first magnet 412 and is fixed to and electrically connected to the first coil 411.

[0157] The first circuit section 510 and the first coil 411 are fixed to the same frame. In the aforementioned embodiment, the first circuit section 510 is fixed to the second frame 200, and the first coil 411 is fixed to the first circuit section 510, thereby the first coil 411 is indirectly fixed to the second frame 200 through the first circuit section 510. It should be understood that in other embodiments of this application, when the first coil 411 is fixed to the first frame 100, the first circuit section 510 is also fixed to the first frame 100, in which case the first coil 411 is indirectly fixed to the first frame 100 through the first circuit section 510.

[0158] It is worth mentioning that, in this application, the first circuit section 510 can be implemented as follows: Figure 1 The circuit board shown in the middle substrate 10; the first circuit section 510 can also be implemented as other conductive components, such as conductive metal inserts. The metal insert is embedded in the second frame 200 by an insert injection molding process to give the second frame 200 electrical function, and the first coil 411 is fixed to the second frame 200 and electrically connected to the metal insert.

[0159] Furthermore, the first driving unit also includes a first position detection component. The first position detection component includes at least one first position sensor 610 for acquiring position change information of the first frame 100 relative to the second frame 200. The first position sensor 610 is fixed and electrically connected to the first circuit section 510. The first position sensor 610 is opposite to the first magnet 412 and acquires the magnetic field information of the first magnet 412. By acquiring changes in the magnetic field information of the first magnet 412, the first position sensor 610 acquires the position change information of the first magnet 412 relative to the first position sensor 610, and thus acquires the position change information of the first frame 100 relative to the second frame 200.

[0160] It is worth mentioning that the first position sensor 610 can be implemented as a Hall effect sensor, a TMR sensor, or a driver chip with integrated position sensing function. In some cases, the position detection component also includes at least one first capacitor 620, which is disposed adjacent to the first position sensor 610. The first capacitor 620 is fixed and electrically connected to the first circuit section 510 to assist in position sensing.

[0161] Furthermore, the support includes a first retaining component for movably suspending the first frame 100 on the second frame 200. In one embodiment, the first retaining component includes a first support portion 711 and a first magnetic attraction portion 712, wherein the first support portion 711 is disposed between the first frame 100 and the second frame 200, and the first frame 100 is supported on the second frame 200 by the first support portion 711, and the first magnetic attraction portion 712 and the first coil 411 are fixed to the same frame (see reference). Figure 13 In the embodiment shown, the first magnetic part 712 is fixed to the second frame 200, so that the first magnetic part 712 and the first magnet 412 are magnetically attracted to each other, so that the first frame 100 and the second frame 200 clamp the first support part 711 and the first frame 100 is supported on the second frame 200.

[0162] Please refer to Figure 13 As shown, in some embodiments, the first support 711 is implemented as two guide rods, which restrict the direction of movement of the first frame 100. Specifically, the two guide rods are disposed on both sides of the first magnet 412 and the first coil 411. In other embodiments, the first support 711 may also be implemented as at least three ball bearings, at least three sliders, or a combination of at least two of ball bearings, sliders, and guide rods.

[0163] The first magnetic attraction portion 712 is implemented as a magnetic object suitable for being attracted by a magnet, such as a magnetic yoke. The first magnetic attraction portion 712 is disposed on the side of the first coil 411 away from the first magnet 412. In some embodiments, the first magnetic attraction portion 712 is fixed to the side of the first circuit portion 510 away from the first coil 411.

[0164] Furthermore, in some embodiments, the driving device further includes a third frame 300, to which the second frame 200 is movably suspended, thereby allowing the first frame 100 to move within the third frame 300 under the influence of the second frame 200. The driving assembly also includes at least one second driving unit, each second driving unit including at least one second coil 421 and at least one second magnet 422, with the second coil 421 and the second magnet 422 disposed opposite to each other. The second coil 421 is fixed to one of the second frame 200 and the third frame 300, and the second magnet 422 is fixed to the other of the second frame 200 and the third frame 300.

[0165] Please refer to Figure 13 As shown, in some embodiments, the second magnet 422 is fixed to the second frame 200, and the second coil 421 is fixed to the third frame 300, forming a moving magnet drive structure. After the second coil 421 is energized, the second coil 421 drives the second frame 200 and the second magnet 422 fixed to the second frame 200 to move relative to the third frame 300.

[0166] Specifically, in the above embodiments, the second magnet 422 moves relative to the second coil 421 in a direction perpendicular to the optical axis o, and the second driving unit drives the second frame 200 to move relative to the third frame 300 in a direction perpendicular to the optical axis o, thereby achieving optical image stabilization. It should be understood that in other examples of this application, the second driving unit can also drive the second frame 200 to move relative to the third frame 300 in a direction perpendicular to the optical axis o, thereby achieving optical focusing.

[0167] It should be understood that in other examples of this application, the second magnet 422 may also be fixed to the third frame 300, and the second coil 421 may be fixed to the second frame 200, thereby forming a moving coil drive architecture.

[0168] Please combine Figure 12 as well as Figure 13 As shown, in some embodiments, the driving device can be divided into a first side S1, a second side S2, a third side S3 and a fourth side S4 around the optical lens 1 with the optical axis o as the center; the driving assembly includes two sets of second driving units, which are located on the first side S1 and the second side S2 of the optical lens 1 respectively, and are used to drive the second frame 200 to move relative to the third frame 300 in the direction of the first side S1-the third side S3 and the direction of the second side S2-the fourth side S4.

[0169] Specifically, in the above embodiment, the second driving unit located on the first side S1 includes a second coil 421 and a second magnet 422, and the second driving unit located on the second side S2 includes two second coils 421 and two second magnets 422, and the two second coils 421 are spaced apart along a direction parallel to the first side S1 to the third side S3.

[0170] Furthermore, the drive assembly includes a set of first drive units located on the fourth side S4 of the optical lens 1.

[0171] In addition, in some other embodiments, the third frame 300 is movably suspended from the second frame 200, and the first frame 100 is movably suspended from the third frame 300, so that the first frame 100 can move in the second frame 200 under the drive of the third frame 300.

[0172] Furthermore, the conductive component also includes a second circuit portion 520 for providing current to the second coil 421. The second circuit portion 520 is disposed on the side of the second coil 421 away from the second magnet 422 and is fixed and electrically connected to the second coil 421.

[0173] The second circuit section 520 and the second coil 421 are fixed to the same frame. Figure 13 In the illustrated embodiment, the second circuit section 520 is fixed to the third frame 300, and the second coil 421 is fixed to the second circuit section 520, thereby the second coil 421 is indirectly fixed to the third frame 300 through the second circuit section 520. It should be understood that in some other embodiments, when the second coil 421 is fixed to the second frame 200, the second circuit section 520 is also fixed to the second frame 200; in this case, the second coil 421 is indirectly fixed to the second frame 200 through the second circuit section 520.

[0174] It is worth mentioning that, in this application, the second circuit section 520 can be implemented as follows: Figure 1 The circuit board shown in the middle substrate 10; the second circuit section 520 can also be implemented as other conductive components, such as conductive metal inserts. The metal insert is embedded in the third frame 300 by an insert injection molding process so that the third frame 300 has electrical functions, and the second coil 421 is fixed to the third frame 300 and electrically connected to the metal insert.

[0175] Furthermore, the conductive component also includes a circuit output section electrically connected to the first circuit section 510 and the second circuit section 520. The circuit output section serves as a circuit output component of the driving component and is used to electrically connect the first circuit section 510, the second circuit section 520, and the photosensitive module 2. In some cases, the circuit output section can also be used for the electrical connection of the first circuit section 510 and the second circuit section 520.

[0176] In this application, the circuit output section includes a circuit connector 531 and a circuit output component 532. One end of the circuit connector 531 is electrically connected to the first circuit section 510, and the other end is fixed to the third frame 300 and electrically connected to the circuit output component 532. The circuit output component 532 is embedded in the third frame 300 and has a partially exposed soldering area (visible from the side and bottom). Through the soldering area of ​​the circuit output component 532, the circuit connector 531 and the second circuit section 520 are electrically connected to the circuit output component 532 (e.g., by laser welding, soldering, conductive adhesive, etc.), so that both the first circuit section 510 and the second circuit section 520 are electrically connected to external components (e.g., the photosensitive module 2) through the circuit output component 532.

[0177] In some other embodiments, the first circuit section 510 may also be directly electrically connected to external components via the circuit connector 531.

[0178] Further, please refer to Figure 14 As shown, the second driving unit further includes a second position detection component, which includes at least one second position sensor 630 for acquiring position change information of the second frame 200 relative to the third frame 300. The second position sensor 630 is fixed and electrically connected to the second circuit section 520. The second position sensor 630 is opposite to the second magnet 422 and acquires the magnetic field information of the second magnet 422. By acquiring the change in the magnetic field information of the second magnet 422, the second position sensor 630 acquires the position change information of the second magnet 422 relative to the second position sensor 630, and thus acquires the position change information of the second frame 200 relative to the third frame 300.

[0179] It is worth mentioning that the second position sensor 630 can be implemented as a Hall effect sensor, a TMR sensor, or a driver chip with integrated position sensing functionality. In some cases, the position detection component also includes at least one second capacitor 640, which is disposed adjacent to the second position sensor 630. The second capacitor 640 is fixed and electrically connected to the second circuit section 520 to assist in position sensing.

[0180] Please combine Figure 13 as well as Figure 14As shown, in some embodiments, the second position sensor 630 is disposed on the side of the second circuit section 520 away from the second coil 421, and the second position sensor 630 and the second coil 421 are disposed on opposite sides of the second circuit section 520. Correspondingly, the second capacitor 640 is also disposed on the side of the second circuit section 520 away from the second coil 421, and the second capacitor 640 and the second coil 421 are disposed on opposite sides of the second circuit section 520.

[0181] Furthermore, the support also includes a second retaining component for movably suspending the second frame 200 on the third frame 300. In some embodiments, the second retaining component includes a second support portion 721 and a second magnetic attraction portion 722. The second support portion 721 is disposed between the second frame 200 and the third frame 300, thereby supporting the second frame 200 on the third frame 300 via the second support portion 721. The second magnetic attraction portion 722 and the second coil 421 are fixed to the same frame (in... Figure 13 and Figure 14 In the embodiment shown, the second magnetic part 722 is fixed to the third frame 300, so that the second magnetic part 722 and the second magnet 422 magnetically attract each other, so that the second frame 200 and the third frame 300 clamp the second support part 721, and the second frame 200 is supported on the third frame 300.

[0182] In some embodiments, the second support 721 is implemented as at least three balls, specifically, at least three balls are disposed at three corners between the second frame 200 and the third frame 300. In other embodiments, the second support 721 may also be implemented as at least two guide rods, at least three sliders, or a combination of at least two of balls, sliders, and guide rods.

[0183] The second magnetic attraction part 722 is implemented as a magnetic object suitable for being attracted by a magnet, such as a magnetic yoke. The second magnetic attraction part 722 is disposed on the side of the second coil 421 away from the second magnet 422. In some embodiments, the second magnetic attraction part 722 is fixed to the side of the second circuit part 520 away from the second coil 421.

[0184] Furthermore, the drive unit also includes a top cover 800, which is adapted to engage with the third frame 300 to form a receiving space for accommodating and protecting other components.

[0185] In some embodiments, at least one first driving unit or a second driving unit includes the aforementioned magnetic adhesive layer 41. The driving unit can be used to drive one of the first frame 100 and the second frame 200 to move relative to the other along the optical axis, drive one of the first frame 100 and the second frame 200 to move relative to the other along a direction perpendicular to the optical axis, drive one of the second frame 200 and the third frame 300 to move relative to the other along the optical axis, and / or drive one of the second frame 200 and the third frame 300 to move relative to the other along a direction perpendicular to the optical axis.

[0186] In other words, the aforementioned driving unit can be applied to the focusing drive section, the image stabilization drive section, or both of the driving device. Taking at least one first driving unit including a magnetic adhesive layer 41 as an example, the first circuit section 510 is a substrate 10, the first coil 411 fixed to the first circuit section 510 is a coil 20, the first magnet 412 corresponding to the first coil 411 is a magnet 30, the magnetic adhesive layer 41 is fixed to the first circuit section 510 and / or the first coil 411, and the projection of the magnetic adhesive layer 41 along the relative arrangement direction of the first coil 411 and the first magnet 412 is completely located within the outer contour range of the first coil 411, so as to enhance the driving force between the first coil 411 and the first magnet 412.

[0187] In addition, the drive unit can be such as Figure 12 The vertical lens driving device shown may also be other types of driving devices not illustrated, such as chip driving devices, periscope driving devices, gimbal driving devices, etc., which will not be listed here.

[0188] Please refer to Figure 11 As shown, this application also provides a camera module, including an optical lens 1, a photosensitive module 2, and the aforementioned driving device; the optical lens 1 is disposed in one of the first frame 100 or the second frame 200, and is used to receive and emit light along its own optical axis; the photosensitive module 2 is disposed in the other of the first frame 100 or the second frame 200, and is used to receive the light emitted from the optical lens 1 for imaging. That is, the driving device is used to drive one of the optical lens 1 or the photosensitive module 2 to move relative to the other, so as to achieve focusing and / or image stabilization.

[0189] The optical lens 1 can be a part of an optical system consisting of only one or a few lenses, or it can be a complete optical system. The photosensitive module 2 includes a photosensitive chip. Specifically, the photosensitive module 2 includes a chip circuit board and a photosensitive chip electrically connected to the chip circuit board.

[0190] In some embodiments, the photosensitive module 2 further includes a filter and a filter holder, wherein the filter element is disposed between the photosensitive chip and the optical lens 1 and is used to filter out unwanted wavelengths of light (e.g., infrared light) from the light entering the photosensitive chip, the filter is supported on the filter holder, and the filter holder is fixed to the chip circuit board.

[0191] This application also provides a method for manufacturing a motor, applicable to the above-mentioned motor, comprising the following steps:

[0192] S100. Fix the coil to the substrate to form an accommodating cavity between the inner wall of the coil and the substrate;

[0193] S200. Apply a magnetic element to the accommodating cavity and position the center of the magnetic element on the first bias side L1 of the coil center;

[0194] S300. The substrate and the magnet are spaced apart on two frames along the first direction C1, such that the coil and the magnet are spaced apart along the first direction C1, and the center of the magnet is located on the second bias side L2 of the center of the coil.

[0195] In this application, by first fixing the coil to the substrate and then applying magnetic adhesive to the accommodating cavity, a limiting space can be formed between the inner wall of the coil and the substrate to limit the setting range of the magnetic component. This ensures that the component can be confined inside the coil without the need for additional molds.

[0196] Further, step S100 includes: applying adhesive to the substrate, placing the coil at the adhesive position on the substrate, and curing the adhesive to complete the fixation between the coil and the substrate; step S200 includes: applying magnetic adhesive into the accommodating cavity and curing it to form a magnetic adhesive layer with its center located on the first bias side L1 of the coil.

[0197] The glue fixation in step S100 ensures that there are no gaps between the coil and the substrate, thereby preventing the magnetic adhesive from leaking through the gaps when it is applied later. Of course, other commonly used fixing methods can also be used to fix the two, as long as there are no gaps between the coil and the substrate. This application will not give examples of each method here.

[0198] In some embodiments, the step prior to step S100 is: electrically connecting the position sensor and the capacitor on the substrate via an SMT process.

[0199] In some embodiments, after step S100, the method further includes step S400: soldering the terminals of the coil to the coil pads on the substrate. That is, step S400 can be performed after step S100 or after step S200, as long as the coil is fixed first.

[0200] In some embodiments, the curing method in step S200 is thermal curing, which offers high reliability. Of course, in other embodiments, the magnetic adhesive can also be cured by other curing methods such as light curing and moisture curing; these will not be listed here.

[0201] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0202] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A driving unit for driving optical elements, characterized in that, The device includes a substrate, a coil, a magnet, and a magnetic component. The coil is fixed to the substrate. The coil and the magnet are spaced apart along a first direction, and the center of the magnet is located on a second offset side of the center of the coil. When the coil is energized, it can drive the magnet to move relative to the coil. The magnetic element is fixed to the coil and / or the substrate, and the center of the magnetic element is located on the first bias side of the center of the coil to enhance the driving force between the portion of the coil located on the first bias side and the magnet. The magnetic component is a magnetic adhesive layer, which includes an adhesive layer matrix and magnetic fillers distributed inside the adhesive layer matrix. Wherein, the first bias side and the second bias side are two opposite sides of the coil center along a third direction, and the third direction is perpendicular to the first direction.

2. The driving unit according to claim 1, characterized in that, The magnetic components include permanent magnet materials and / or soft magnetic materials.

3. The driving unit according to claim 1, characterized in that, The substrate has a protrusion and / or a recess on its surface along the first direction, the protrusion being located on the second bias side of the center of the coil, and the recess being located on the first bias side of the center of the coil.

4. The driving unit according to claim 1, characterized in that, The magnetic element is located entirely on the first bias side at the center of the coil.

5. The driving unit according to claim 4, characterized in that, The coil is annular to form a cavity between the inner wall of the coil and the substrate; the dimension of the magnetic element along the third direction accounts for 10% to 40% of the dimension of the cavity along the third direction.

6. The driving unit according to claim 1, characterized in that, Part of the magnetic element is located on the second bias side at the center of the coil.

7. The driving unit according to claim 6, characterized in that, The coil is annular to form a cavity between the inner wall of the coil and the substrate; the dimension of the magnetic element along the third direction accounts for 60% to 90% of the dimension of the cavity along the third direction.

8. The driving unit according to claim 1, characterized in that, The magnetic component is in contact with the inner wall of the coil.

9. The driving unit according to claim 1, characterized in that, The magnet has two or more magnetic poles on the side facing the coil, the direction of the magnetic poles on the side facing the coil is parallel to a second direction, and the direction of movement of the magnet relative to the coil is parallel to the second direction; wherein, the second direction is perpendicular to the first direction and the third direction.

10. The driving unit according to claim 9, characterized in that, The magnetic components are symmetrically arranged on both sides along the third direction.

11. The driving unit according to claim 1, characterized in that, The cross-sectional area of ​​the magnetic component decreases towards the second bias side along the direction perpendicular to the third direction.

12. The driving unit according to claim 1, characterized in that, The driving unit further includes a position sensor, which is fixed to the substrate and located outside the coil, and the position sensor is located on the second bias side of the coil.

13. The driving unit according to claim 1, characterized in that, The projection of the magnetic component along the first direction is entirely within the projection range of the coil.

14. A driving device for driving optical elements, characterized in that, Includes a first frame, a second frame, supporting components, and driving components; The first frame is used to support the optical element, and the support member is disposed between the first frame and the second frame and is used to movably suspend the first frame in the second frame. The driving component includes the driving unit as described in any one of claims 1 to 11, and is configured to drive the first frame to move relative to the second frame.

15. A camera module, characterized in that, Includes an optical lens, a photosensitive module, and a driving device as described in claim 14; The optical lens is disposed in one of the first frame or the second frame and is used to receive and emit light along its own optical axis. The photosensitive module is disposed in the other of the first frame or the second frame, and is used to receive the light emitted from the optical lens for imaging.

16. A method for fabricating a driving unit, applicable to the driving unit according to claim 1, characterized in that, Including the following steps: a. Fix the coil to the substrate to form an accommodating cavity between the inner wall of the coil and the substrate; b. Apply a magnetic element into the accommodating cavity such that the center of the magnetic element is located on the first bias side of the coil center; c. The substrate and the magnet are spaced apart on two frames along a first direction, such that the coil and the magnet are spaced apart along the first direction, and the center of the magnet is located on a second bias side of the center of the coil, wherein the first bias side and the second bias side are two opposite sides of the center of the coil along a third direction, and the third direction is perpendicular to the first direction.

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