An assembling method of a camera module and a camera module

Abstract

The application discloses an assembling method of a camera module and the camera module, and comprises the following steps: S1. providing a motor chip assembly, comprising a mover capable of moving relative to a photosensitive chip; S2. driving the mover to an initial center position, in which the center of the mover is aligned with the center of the photosensitive chip along the optical axis direction, assembling a lens into the mover, and locating the initial position of the lens within the center through-hole range of the mover; S3. cyclically executing the following steps: S31. adjusting the position of the lens relative to the photosensitive chip to calibrate the inclination and offset of the lens relative to the photosensitive chip; S32. driving the mover to move to a stroke center position, so that the gap between the mover and the lens is uniformly distributed; until the image quality acquired by the photosensitive chip meets the preset requirement, and the gap between the mover and the lens is uniformly distributed, the cyclic step is ended; and S4. curing the preset glue between the mover and the lens to fix the relative position of the lens and the mover, and obtaining the camera module.

Description

Technical Field

[0001] This application relates to the technical field of camera module assembly methods, and in particular to a camera module assembly method and a camera module. Background Technology

[0002] In the manufacturing of camera modules, the traditional assembly process typically uses the VA (Voice Coil Motor Attach) method. The core step of this process is to first pre-assemble the optical lens and the motor that drives it (such as a voice coil motor, VCM) into a separate lens-motor assembly. Then, in the final assembly stage of the entire module, this assembly is optically aligned and fixed to the photosensitive component (containing a photosensitive chip).

[0003] However, traditional assembly processes face multiple challenges in camera module assembly: due to manufacturing tolerances inherent in the lens, motor, and photosensitive components, as well as the accumulation of errors during multi-stage assembly, camera modules finally formed using the VA process typically exhibit a 15′ to 20′ tilt deviation between the lens optical axis and the photosensitive surface of the image sensor. This tilt deviation directly leads to an tilted imaging plane, resulting in decreased edge resolution and blurring, severely impacting the final image quality. While the AA (Active Alignment) process can correct the angle of the lens and photosensitive components at the sub-micron level under real-time imaging feedback, it is limited by the device's approximately 1° adjustment range, requiring a 120–150μm "safety gap" to prevent mechanical interference. This directly increases the module's height, hindering miniaturization design. Furthermore, as the size of the motor or circuit board increases, the gap needs to be enlarged accordingly, further compressing the process window. In addition, current large-aperture lenses (such as F1.4) are extremely sensitive to tilt, resulting in shallower depths of focus. The tolerances and calibration margins produced by traditional processes can no longer meet the stringent requirements of high-end optical systems for accuracy and stability.

[0004] Therefore, existing camera module assembly technology has multiple contradictions in terms of tilt correction, miniaturization, dynamic assembly accuracy, and large aperture adaptability, and urgently needs optimization. Summary of the Invention

[0005] One objective of this application is to overcome the influence of tolerances, reduce accumulated tolerances, and improve the assembly accuracy of the camera module.

[0006] Another objective of this application is to reduce the assembly gap between the components of the camera module, thereby achieving miniaturization of the camera module.

[0007] To achieve the above objectives, the technical solution adopted in this application is: a method for assembling a camera module, comprising the following steps:

[0008] S1. Provides a motor chip assembly, including a mover that can move relative to the photosensitive chip;

[0009] S2. Drive the mover to the initial center position, where the center of the mover is aligned with the center of the photosensitive chip along the optical axis, and assemble the lens into the mover so that the initial position of the lens is within the central through hole of the mover;

[0010] S3. Repeat the following steps:

[0011] S31. Adjust the position of the lens relative to the photosensitive chip to calibrate the tilt angle and offset of the lens relative to the photosensitive chip;

[0012] S32. Drive the mover to the center position of the stroke, so that the gap between the mover and the lens is evenly distributed;

[0013] The loop continues until the image quality acquired by the photosensitive chip meets the preset requirements and the gap between the moving part and the lens is evenly distributed, at which point the loop ends.

[0014] S4. The pre-set adhesive between the moving part and the lens is cured to fix the relative position of the lens and the moving part, thereby obtaining the camera module.

[0015] As a preferred embodiment, in step S31, before calibrating the lens, the mover is adjusted to a natural state by de-energizing the image stabilization unit of the motor, and after applying adhesive at the predetermined contact position between the mover and the lens, the lens is assembled into the mover; in step S32, before adjusting the gap between the mover and the lens, the mover is driven to move by energizing the image stabilization unit of the motor.

[0016] As a preferred embodiment, between steps S31 and S32, a step of finding the center position of the moving part's stroke is further included, specifically including:

[0017] S301. Power on the motor, turn on its anti-shake drive controller, and adjust the gain coefficient of the anti-shake drive controller to keep the mover stable;

[0018] S302. Drive the mover to move to its extreme position along a first direction and a second direction perpendicular to the optical axis, respectively, obtain the magnetic potential value corresponding to each extreme position, and calculate the target magnetic potential value corresponding to the center position of the mover's stroke based on the magnetic potential value of each extreme position;

[0019] S303. Control the movement of the mover to the position corresponding to the target magnetic position value, complete the repositioning of the stroke center position, so that the gap between the mover and the lens is evenly distributed.

[0020] As a preferred embodiment, step S3 is repeated at least twice. After step S3 is completed, when the moving part is at the center of the stroke, the radial gap between the lens and the moving part is less than 60 μm.

[0021] As a preferred embodiment, the motor chip assembly in step S1 is assembled through the following steps:

[0022] S11. Provides a motor and a photosensitive component;

[0023] S12. Power on the motor to drive the mover to the initial center position so that the center of the mover is aligned with the center of the photosensitive chip along the optical axis, and assemble the motor into the photosensitive component to obtain the motor chip assembly.

[0024] Preferably, the axial gap between the motor and the photosensitive component is less than 50 μm.

[0025] As a preferred embodiment, after step S4 is completed, the center of the moving part, the optical center of the lens, and the center of the photosensitive chip are aligned.

[0026] As a preferred embodiment, in step S3, the preset requirement for image quality is that the modulation transfer function (MTF) values ​​of each preset region of the image acquired by the photosensitive chip all reach a preset threshold.

[0027] As a preferred embodiment, step S4 includes:

[0028] S41. Keep the moving part at the center of the stroke position and solidify the pre-set adhesive between the lens and the moving part;

[0029] S42. Apply reinforcing adhesive between the lens and the moving part;

[0030] S43. Completely cure the adhesive between the lens and the moving part.

[0031] As a preferred embodiment, a camera module includes a motor assembly, a photosensitive assembly, and a lens, wherein the motor assembly, the photosensitive assembly, and the lens are assembled using any of the assembly methods described above, and the tilt angle deviation of the camera module is less than 10'.

[0032] Compared with the prior art, the beneficial effects of this application are as follows:

[0033] (1) This application provides a method for assembling a camera module, which adopts an innovative process sequence of "assembling the motor to the photosensitive component first, and then assembling the lens", thereby reducing the assembly tolerance of the camera module and improving the assembly accuracy of the camera module.

[0034] (2) This application provides a method for assembling a camera module, which reduces the gap between the motor and the photosensitive component, thereby significantly reducing the shoulder height of the camera module.

[0035] (3) This application provides a method for assembling a camera module, which eliminates dynamic and static deviations of the motor by energizing it, so that the initial alignment accuracy of the motor chip assembly reaches the micrometer level, which can lay a high-precision benchmark for subsequent lens assembly. Attached Figure Description

[0036] Figure 1 This is a cross-sectional schematic diagram of a camera module in the prior art.

[0037] Figure 2 This is a flowchart illustrating the camera module assembly method of this application in one embodiment.

[0038] Figure 3 This is a schematic flowchart of the adhesive curing method for the camera module of this application in one embodiment.

[0039] Figure 4 This is a flowchart illustrating the method for obtaining the camera module motor chip component according to one embodiment of the present application.

[0040] Figure 5 This is a schematic diagram of the process by which the camera module of this application acquires the target magnetic position corresponding to the center position of the mover's travel in one embodiment.

[0041] Figure 6 This is an exploded view of a camera module in one embodiment of this application.

[0042] Figure 7 This is a cross-sectional structural diagram of a camera module in one embodiment of this application.

[0043] Figure 8 This is a three-dimensional cross-sectional structural diagram of a camera module in one embodiment of this application.

[0044] Figure 9 This is a schematic diagram of the lens assembly ingressor in one embodiment of this application.

[0045] In the diagram: 10. Photosensitive component; 11. Photosensitive chip; 111. Photosensitive surface;

[0046] 12. Module base; 121. Circuit board; 122. Electronic components;

[0047] 20. Lens; 21. Lens barrel; 22. Lens group; 23. Lens outer wall; 24. Optical axis;

[0048] 30. Motor; 31. Housing; 311. Housing sidewall; 312. Housing bottom; 313. Housing top;

[0049] 32. Moving element; 321. Moving element through hole; 3211. Inner wall of moving element through hole; 322. Side wall of moving element;

[0050] 33. Drive mechanism;

[0051] 34. Motor base;

[0052] 40. Protective components;

[0053] 50. First adhesive layer; 60. Second adhesive layer;

[0054] 70. Material handling mechanism;

[0055] 10a, Photosensitive module; 11a, Image sensor; 20a, Lens assembly; 30a, Motor assembly. Detailed Implementation

[0056] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0057] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and should not be construed as limiting the specific protection scope of this application.

[0058] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0059] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0060] For ease of description, terms relating to direction will be used. (See attached document.) Figure 1-9As shown, the optical axis 24 (Z-axis direction) refers to the vertical direction of the camera module; the first direction (X-axis direction) refers to the direction perpendicular to the optical axis 24 (Z-axis direction); and the second direction (Y-axis direction) refers to the direction perpendicular to both the optical axis 24 (Z-axis direction) and the first direction (X-axis direction). It is worth noting that these limitations are for illustrative purposes only and do not constitute a limitation on the claims. In this application, the focusing unit (AF) refers to an autofocus system, and the image stabilization unit (OIS) refers to an optical image stabilization system.

[0061] like Figure 1 As shown, in the prior art, camera modules are usually assembled by first combining the lens assembly 20a and the motor assembly 30a to form a lens motor assembly through the VA (voice coil motor assembly) process. Then, the base of the motor assembly 30a is directly attached to the prefabricated photosensitive module 10a to complete the initial installation of the camera module.

[0062] Alternatively, using the HA (Holder Assembly) process, the bottom surface of the lens assembly 20a can be directly attached to the pre-fabricated photosensitive module 10a to form a complete camera module.

[0063] It is understandable that the VA (Voice Coil Motor Assembly) process can be applied to autofocus modules, optical zoom modules, or modules with optical image stabilization. The HA (Hydraulic Actuator Assembly) process can be applied to fixed-focus modules. However, the VA or HA process generally introduces a 15′-20′ tilt deviation between the lens assembly 20a and the image sensor 11a on the image sensor module 10a, which can adversely affect the image quality of the product.

[0064] In existing technologies, an AA (active calibration) process is further introduced to suppress the tilt deviation of the camera module. However, as... Figure 1 As shown, due to the limitation of the active calibration device's adjustment range of approximately 1°, a "safety gap L1" of 120-150μm must be reserved. That is, a safety gap of 120-150μm must be reserved between the bottom surface of the lens assembly 20a and the motor assembly 30a and the top surface of the photosensitive module 10a to prevent mechanical interference during the calibration process.

[0065] Furthermore, the active calibration process typically uses pre-application to pre-fix the "safety gap L1". Therefore, when the glue is filled into the "safety gap L1", the glue thickness will be relatively large. Even if the gap is reduced to some extent after pressing, the gap change is small due to the large glue thickness, making it impossible to achieve miniaturization of the camera module.

[0066] It is worth mentioning that if the size of the motor assembly 30a or the circuit board increases further, the "safety gap L1" still needs to be enlarged accordingly, the process window will tighten, the fault tolerance will decrease, the manufacturing precision requirements will be higher, and the process difficulty will increase. Therefore, adopting the active calibration process requires reserving a larger "safety gap L1", which will further affect the shoulder height of the camera module and is not conducive to the miniaturization of the camera module.

[0067] Furthermore, with the development of electronic devices, the maximum aperture of the main camera in current mobile phones can reach F1.4, while the standard aperture is generally between F1.6 and F2.0. A larger aperture allows for more light intake, enabling the sensor to receive more light in low light conditions, reducing ISO (sensitivity) to minimize noise, and avoiding blur caused by slow shutter speeds (especially when shooting handheld), ultimately resulting in clearer and cleaner night scene or indoor photos. However, large-aperture lenses have greater sensitivity to tilt deviation, and the large aperture results in steeper incident angles of light at the edges, making aberration correction more fragile. Depth of focus (DPF) = 2*c*f² / (N*D), where the depth of focus f is directly proportional to the aperture value N, directly proportional to the focal length f, and inversely proportional to the object distance D, and c is the diameter of the circle of confusion, i.e., the "acceptable blur threshold" related to the sensor pixel size. Therefore, when a camera module is applied to a large-aperture camera, it also requires smaller tilt deviations.

[0068] Based on this, such as Figure 2 As shown, this application proposes a method for assembling a camera module, including the following steps:

[0069] S1. Provide a motor chip assembly, including a mover 32 that can move relative to the photosensitive chip 11;

[0070] S2. Drive the mover 32 to the initial center position. In the initial center position, the center of the mover 32 is aligned with the center of the photosensitive chip 11 along the optical axis 24. Assemble the lens 20 into the mover 32 so that the initial position of the lens 20 is within the central through hole of the mover 32.

[0071] S3. Repeat the following steps:

[0072] S31. Adjust the position of the lens 20 relative to the image sensor 11 to calibrate the tilt angle and offset of the lens 20 relative to the image sensor 11;

[0073] S32. Drive the mover 32 to the center position of the stroke, so that the gap between the mover 32 and the lens 20 is evenly distributed;

[0074] The loop continues until the image quality acquired by the photosensitive chip 11 meets the preset requirements and the gap between the mover 32 and the lens 20 is evenly distributed.

[0075] S4. The pre-set adhesive between the mover 32 and the lens 20 is cured to fix the relative position of the lens 20 and the mover 32, thus obtaining the camera module.

[0076] Specifically, this application incorporates a preset central axis during the camera module assembly process. This preset central axis serves as the standard for determining whether the centers of the mover 32, the photosensitive chip 11, and the lens 20 are aligned along the optical axis 24 of the camera module. When step S4 is completed, the centers of the mover 32, the photosensitive chip 11, and the lens 20 are all on the same central axis, thus meeting the requirements of the preset central axis. Here, the center of the mover 32 refers to the physical center of the mover through-hole 321; the center of the lens 20 refers to the optical center of the lens 20; and the center of the photosensitive chip 11 refers to the physical center of the pixel array.

[0077] This application reduces the initial offset and position adjustment of the lens 20 by assembling the lens 20 into the mover 32, which is located at the initial center position, thereby improving assembly efficiency. It also reduces the reserved gap between the lens 20 and the mover 32, thus miniaturizing the camera module. At the same time, during the adjustment of the lens 20, the position of the mover 32 is adjusted by powering on, thereby increasing the position adjustment margin of the lens 20. This allows the lens 20 to achieve high-precision adjustment within a limited space, resulting in a high-performance camera module.

[0078] In addition, this application first places the motor 30 on the photosensitive component 10 to assemble a motor chip assembly. The motor chip assembly is assembled through a visual calibration process to ensure that when powered on, the mover 32 is in the initial center position, and in the initial center position, the center of the mover 32 is aligned with the center of the photosensitive chip 11.

[0079] Specifically, before assembling the lens 20 in step S2, the motor 30 (focusing and image stabilization units) is powered on to drive the mover 32 to its initial center position, aligning the center of the mover 32 with the center of the image sensor 11. Then, the lens 20 is assembled into the mover 32, so that the initial position of the lens 20 is within the central through-hole area of ​​the mover 32.

[0080] It should be understood that step S2, which powers on motor 30, aims to ensure that during the lens 20 assembly process, the mover 32 is located at the initial center position, thereby helping to limit the initial position of lens 20 to the vicinity of the initial center position and reduce the initial offset of lens 20.

[0081] After step S2, the position between lens 20 and photosensitive chip 11 needs to be adjusted. However, after lens 20 is assembled, the mover 32 may shift, and the change in the position of the mover 32 may interfere with the adjustment of lens 20. Therefore, in step S3, the position of the mover 32 needs to be adjusted according to the position of lens 20 to prevent the mover 32 from interfering with the adjustment of lens 20. At the same time, the gap between lens 20 and mover 32 is redistributed to increase the adjustment margin of lens 20. Specifically, in step S3, as the position of lens 20 relative to photosensitive chip 11 changes, the position of mover 32 is continuously adjusted to ensure a certain gap between lens 20 and mover 32, avoiding interference from mover 32 with the adjustment of lens 20, until the position of lens 20 is finally calibrated so that the center of lens 20 is aligned with the center of photosensitive chip 11. During the fine-tuning process, the motor 30 is first de-energized, allowing the mover 32 to be in its natural state. Then, the lens 20 is calibrated using an active calibration process. Keeping the mover 32 in its natural state prevents it from affecting the accuracy of the active alignment process of the lens 20. During the active calibration process, the lens 20 may interfere with the mover 32. In this case, the position of the mover 32 needs to be readjusted to redistribute the gap between the lens 20 and the mover 32, increasing the margin for active alignment adjustment and preventing the mover 32 from interfering with the adjustment of the lens 20. After the center of the lens 20 is aligned with the center of the photosensitive chip 11, the center of the mover 32 can also be adjusted to align with the center of the lens 20, ensuring a uniform distribution of the gap between the lens 20 and the mover 32.

[0082] Repeat steps S31 and S32 until it is confirmed that the image quality acquired by the photosensitive chip 11 in step S31 meets the preset requirements. At this time, it is assumed that the center of the lens 20 is aligned with the center of the photosensitive chip 11. In step S32, the gap between the mover 32 and the lens 20 is evenly distributed, that is, the center of the mover 32 is aligned with the center of the lens 20. Thus, the center of the mover 32, the center of the photosensitive chip 11, and the center of the lens 20 are aligned, and the cycle ends.

[0083] Finally, the adhesive placed between the mover 32 and the lens 20 is cured to fix the relative position of the lens 20 and the mover 32, thereby obtaining a camera module that meets the preset central axis requirements of this application.

[0084] It should be understood that the "initial center position" in step S2 refers to the position where the center of the mover 32 and the center of the photosensitive chip 11 are aligned, determined by vision. By driving the mover 32 of the motor 30 to the initial center position, a high-precision initial reference is provided for subsequent AA calibration, reducing the adjustment amount and time of the lens 20.

[0085] In step S2, by simultaneously energizing the focusing and image stabilizing parts of the motor 30, all six degrees of freedom of the lens 20 can be locked, ensuring that the lens 20 is accurately and stably positioned during loading (installation or positioning), and avoiding errors caused by minute displacements or rotations.

[0086] Furthermore, in step S2, the lens 20 installation process includes: removing the lens 20 from the hopper using a material handling mechanism 70 (such as a vacuum adsorption device, mechanical gripper, etc.). Figure 9 As shown, after visually recognizing the position of the central through hole of the mover 32 and aligning it with the photosensitive chip 11, the material handling mechanism 70 is controlled to descend along the optical axis 24 to insert the lens 20 into the central through hole of the mover 32. This ensures that the initial position of the lens 20 does not deviate significantly from the photosensitive chip 11, reducing the adjustment amount of the lens 20.

[0087] In step S31, before calibrating the lens 20, the image stabilization unit of the motor 30 is de-energized, and the mover 32 is adjusted to its natural state. It can be understood that with the image stabilization unit energized, the lens 20 is assembled, limiting its offset to within the central aperture range of the mover 32. Optical calibration is performed with the image stabilization unit de-energized, ensuring that the mover 32 does not interfere with the optical calibration accuracy of the lens 20. In step S31, the "stroke center position" refers to the point where the mover 32 moves to a position with uniform gap between the lens 20 and the mover 32, centered on the lens 20. The "stroke center position" is achieved by fine-tuning the mover 32 to uniformize the gap between the lens 20 and the mover 32 in all directions, ensuring that after the lens 20 is assembled, the mover 32 will not interfere with the active calibration adjustment of the lens 20.

[0088] In step S31, after assembling the lens 20, the image stabilization unit of the motor 30 is de-energized, and the mover 32 is adjusted to its natural state to prevent the mover 32 from interfering with the calibration accuracy of the lens 20. After applying adhesive at the predetermined contact position between the mover 32 and the lens 20, the lens 20 is assembled into the mover 32.

[0089] In step S32, by energizing the anti-shake unit of the motor 30, the mover 32 is driven to move, and electromagnetic forces in the first and second directions are actively applied to drive the mover 32 to the center position of the stroke. The relative positions between the lens 20 and the mover 32 are redistributed, so that the gap between the mover 32 and the lens 20 is evenly distributed, and there will be no interference between the mover 32 and the lens 20, thus avoiding affecting the motion performance of the camera module.

[0090] It is worth mentioning that, due to the small gap between the mover 32 and the lens 20, interference between them needs to be avoided, eliminating the interference of the mover 32 on the movement of the lens 20. Therefore, the gap between the mover 32 and the lens 20 needs to be redistributed as needed for active calibration adjustment, increasing the adjustable range during active calibration, improving calibration flexibility and accuracy, ensuring optimal alignment between the lens 20 and the image sensor 11, and thus improving image quality.

[0091] It is understandable that by redistributing the gap between the mover 32 and the lens 20, not only can high-precision adjustment of the small gap be achieved, but also the smaller reserved gap between the lens 20 and the mover 32 is beneficial to the miniaturization of the camera module.

[0092] In some embodiments, step S3 includes steps S31 and S32, which are executed at least twice until the image quality acquired by the photosensitive chip 11 meets the preset requirements, and the center of the mover 32, the center of the photosensitive chip 11, and the center of the lens 20 are aligned along the optical axis 24.

[0093] In some embodiments, steps S31 and S32 can be repeated multiple times in a loop, such as (first active calibration) → position allocation → second active calibration. Specifically, the motor 30 has a stabilization unit capable of generating stabilization driving force, driving the mover 32 to move along a first direction and a second direction perpendicular to the optical axis 24. AA calibration of the lens 20 is performed when the stabilization unit of the motor 30 is powered off, to avoid the mover 32 interfering with the correction accuracy of the active calibration. When the stabilization unit of the motor 30 is powered on, the gap between the lens 20 and the mover 32 is redistributed, evenly distributing the available gap for active calibration and expanding the adjustment margin for active calibration. The stabilization unit of the motor 30 is powered off again, and active calibration of the lens 20 is performed until the quality of the image acquired by the image sensor 11 meets the requirements. For example, when the image quality index is the MTF (Modulation Transfer Function) value, the position of the lens 20 corresponding to the point with the highest MTF value in each preset region of the image can be determined as the optimal imaging position, and the loop terminates.

[0094] In some embodiments, such as Figure 3 As shown, step S4, which involves curing the adhesive, includes:

[0095] S41. Keep the moving part 32 in the center of its stroke position and solidify the pre-set adhesive between the lens 20 and the moving part 32;

[0096] S42. Apply reinforcing adhesive between lens 20 and mover 32;

[0097] S43. Completely cure the adhesive between lens 20 and mover 32.

[0098] In some embodiments, in step S4, the relative positions of the lens 20 and the mover 32 are locked by pre-cured adhesive, which can prevent position drift in subsequent steps and at the same time preserve the elasticity of the adhesive for precise adjustment.

[0099] It is worth mentioning that, during the pre-curing process in step S4, pre-curing is preferably performed while the drive mechanism 33 is energized. On the one hand, by actively constraining the position of the mover 32, it is ensured that the position of the lens 20 after pre-curing is highly consistent with the active calibration result. On the other hand, the curing of the adhesive is accompanied by a chemical cross-linking reaction, resulting in volume shrinkage or local stress concentration. If pre-curing is performed while the image stabilization unit is de-energized, the mover 32 may undergo slight displacement due to stress release, causing the interface between the lens 20 and the mover 32 to bear additional shear force, increasing the risk of peeling. During subsequent complete curing, only the remaining cross-linking reaction of the adhesive needs to be completed, without the need for secondary adjustments, significantly reducing the defect rate caused by position drift and improving production line efficiency and yield.

[0100] Furthermore, after the adhesive pre-cures in step S4 but before it fully cures, a re-adhesion step can be included: adjusting the mover 32 to its natural state and applying adhesive between the lens 20 and the mover 32 for reinforcement. It should be understood that when adhesive is applied during power-off, the mover 32 returns to its natural state, and the existing adhesive slowly releases internal stress due to the slight displacement of the mover 32 (such as slight sinking due to stress release). Applying adhesive after the stress release has stabilized ensures a more consistent interface stress state between the new and existing adhesives (both at the stress level under natural conditions), significantly reducing the risk of interface delamination between the re-adhesion layer and the original adhesive, and improving overall connection strength.

[0101] In some embodiments, in step S4, the pre-cured adhesive may be a dotted adhesive, and in the adhesive repair step, the reinforcing adhesive may be a ring adhesive.

[0102] Furthermore, after step S4 is completed, the center of the mover 32, the optical center of the lens 20, and the center of the photosensitive chip 11 are coaxial, ensuring that light passes through the lens 20 efficiently and is focused on the photosensitive component 10, reducing light loss and improving light utilization.

[0103] In some embodiments, after step S4 is completed, the radial gap d2 between the lens 20 and the mover 32 is less than 60 μm.

[0104] In some embodiments, after step S4 is completed, the radial gap d2 between the lens 20 and the mover 32 is less than 50 μm.

[0105] In some embodiments, the image quality meeting the preset requirements can be achieved when the modulation transfer function (MTF) values ​​of each preset region of the image acquired by the photosensitive chip 11 all reach a preset threshold.

[0106] In some embodiments, such as Figure 4 As shown, the motor chip assembly in step S1 is assembled through the following steps:

[0107] S11. Provides a motor 30 and a photosensitive component 10;

[0108] S12. Power on the motor 30 to drive the mover 32 to the initial center position so that the center of the mover 32 is aligned with the center of the photosensitive chip 11 along the optical axis 24. Assemble the motor 30 into the photosensitive assembly 10 to obtain the motor chip assembly.

[0109] In some embodiments, the method for obtaining the motor chip assembly in step S1 includes: providing a lens 20, a motor 30, and a photosensitive assembly 10 for assembling a camera module. The photosensitive assembly 10 includes a photosensitive chip 11. The motor 30 includes a housing 31, a mover 32 disposed within the housing 31, a drive mechanism 33 for moving the mover 32, and a motor base 34 supporting the mover 32. The drive mechanism 33 is energized to move the mover 32 to its theoretical stroke center position. With the mover 32 at its theoretical stroke center position, the motor 30 is then fixed to the photosensitive assembly 10, aligning the center of the mover 32 with the center of the photosensitive chip 11 along the optical axis 24. The theoretical stroke center position refers to the center point of the mover 32's stroke under design or ideal conditions, based on the specifications and theoretical model of the motor 30, without considering actual assembly tolerances, load variations, etc.

[0110] In some embodiments, assembling the motor 30 onto the photosensitive component 10 can reduce the axial gap between the motor 30 and the photosensitive component 10 to less than 50 μm, thereby reducing the gap between the motor 30 and the photosensitive component 10, reducing the adhesive thickness, and reducing the variation in adhesive curing shrinkage.

[0111] In step S1, the mover 32 of the motor 30 may deviate from its theoretical center due to its own weight, deformation of the elastic element, etc. Excessive positional error of the motor 30 can lead to focus shift, reduced resolution, and image stabilization shift. Directly attaching the motor 30 to the image sensor 10 would result in both static and dynamic deviations. Therefore, during the assembly of the motor 30 and the image sensor 10, the motor 30 is energized to put it into operation, causing the mover 32 to float back to its initial center position. Then, the center of the mover 32 is aligned coaxially with the center of the image sensor 11 to eliminate the dynamic and static deviations of the motor 30.

[0112] It is understandable that after the motor 30 is powered on and assembled to the photosensitive component 10, the static and dynamic deviations of the motor 30 are eliminated, thus eliminating part of the deviation of the camera module. Therefore, when the position of the lens 20 is subsequently corrected, the adjustment amount of the lens 20 is reduced, and the gap between the lens 20 and the motor 30 can be reduced, which is beneficial to the miniaturization of the camera module.

[0113] This application employs a method of assembling the motor 30 to the photosensitive component 10 first, followed by assembling the lens 20 to both the motor 30 and the photosensitive component 10. This reduces accumulated tolerances and minimizes the gap. Specifically, when assembling the motor 30 to the photosensitive component 10, only the flatness of the circuit board of the photosensitive component 10, the material tolerance of the motor 30, and the adhesive between the motor 30 and the photosensitive component 10 need to be considered. This results in a shorter tolerance chain, a smaller required gap, and consequently, a smaller adhesive thickness. The minimum gap between the motor 30 and the photosensitive component 10 in this application can be the thickness of the adhesive after physical bonding, such as 20-30 μm, and the maximum gap can be controlled within 50 μm. That is, the axial gap between the motor 30 and the photosensitive component 10 is less than 50 μm, which is more than 60% smaller than the 120-150 μm of the traditional process. Therefore, assembling the motor 30 to the photosensitive component 10 first helps to reduce the gap between the motor 30 and the photosensitive component 10, decrease the adhesive thickness, and reduce the variation in adhesive curing shrinkage.

[0114] It is worth mentioning that when the mover 32 is unloaded, the theoretical and actual travel center positions of the mover 32 are consistent. However, when the lens 20 is inserted into the mover 32, it is difficult to guarantee that the theoretical and actual travel center positions of the mover 32 are consistent, and the lens 20 may shift. Therefore, after the lens 20 is inserted, it will also affect the travel of the mover 32, and the actual travel center position of the mover 32 needs to be recalculated, and the corresponding travel center position will also change. In addition, with the adjustment of the lens 20 in the above-mentioned cyclic step S31, the position of the lens 20 will also change, and the gap may be insufficient, requiring a new search for the travel center position of the mover 32 to prevent interference.

[0115] The "travel center position" of the re-searched mover 32 mentioned in this application refers to the position of the mover 32 when it is at the geometric center of its range of motion in both the first direction (X-axis direction) and the second direction (Y-axis direction). Specifically, in the first direction, the maximum distance that the mover 32 can move in the positive and negative X-axis directions is equal; in the second direction, the maximum distance that the mover 32 can move in the positive and negative Y-axis directions is equal.

[0116] Determining the location of the travel center is of the following importance:

[0117] (1) As a position feedback reference point: The system detects the magnetic field change of the magnet connected to the mover 32 through a position sensor (such as a Hall sensor), accurately senses the real-time offset of the mover 32 relative to the center of the stroke, and thus realizes high-precision closed-loop control.

[0118] (2) Maximize the working range of image stabilization: When the mover 32 is at the center of its stroke, its movable distance in all directions is equal, which can maximize the effective working range of optical image stabilization.

[0119] In some embodiments, the camera module includes a position sensor, which is installed in the housing 31 of the motor 30 (such as a voice coil motor VCM) and is used to detect the position of the mover 32 in real time. The position sensor works by sensing the change in magnetic field strength generated by a magnet fixedly connected to the mover 32 and outputting a magnetic potential value corresponding to the position of the mover 32 (a quantized position value obtained by sampling the magnetic field by a magnetically sensitive element such as a Hall sensor, TMR sensor, or GMR sensor). A closed-loop control system is formed between the position sensor and the image stabilization drive controller: the image stabilization drive controller sends control commands (such as drive current) to the drive mechanism 33 according to the target position to drive the mover 32 to move; the position sensor provides real-time feedback of the magnetic potential value corresponding to the current position of the mover 32; the image stabilization drive controller dynamically adjusts the drive current based on the deviation between the magnetic potential value feedback and the target magnetic potential value, so that the mover 32 moves precisely to the target position.

[0120] After the lens 20 is assembled, due to the combined effects of various factors (such as physical assembly errors, sensor zero drift, temperature drift, mechanical aging, etc.), a "stabilization unit offset" phenomenon occurs. This means there is a systematic deviation between the position the stabilization unit drive controller believes the mover 32 should be in and its actual position. This affects the actual range of motion of the mover 32. Therefore, the magnetic potential value corresponding to the center position of the stroke measured before the lens 20 is assembled cannot be used directly. Instead, after the lens 20 is assembled, the actual movement boundary of the mover 32 must be re-detected, and a new target magnetic potential value is calculated based on the magnetic potential value at the boundary position. Only by controlling the mover 32 to move to the position corresponding to this target magnetic potential value through the stabilization unit drive controller can the mover 32 be ensured to be truly in the actual center position of the stroke in the lens 20 assembled state, thereby eliminating the stabilization unit offset phenomenon.

[0121] Based on this, such as Figure 5 As shown, between steps S31 and S32, this application also provides a method for finding the center position of the travel of the moving element 32, re-finding the center position of the travel of the moving element 32, and preventing the outer wall of the moving lens 20 from scratching, squeezing, or colliding with the inner wall 3211 of the stationary moving element through hole during the assembly of the camera module, including the following steps:

[0122] S301. Power on motor 30, turn on its anti-shake drive controller, and adjust the gain coefficient of motor 30's anti-shake unit to keep the mover 32 stable.

[0123] S302. Drive the mover 32 to move to its extreme position along the first direction (X-axis direction) and the second direction (Y-axis direction) perpendicular to the optical axis 24, respectively, obtain the magnetic potential value corresponding to each extreme position, and calculate the target magnetic potential value corresponding to the center position of the mover 32's stroke based on the magnetic potential value of each extreme position.

[0124] S303. Control the mover 32 to move to the position corresponding to the target magnetic position value, complete the repositioning of the stroke center position, so that the gap between the mover 32 and the lens 20 is evenly distributed.

[0125] It is understandable that during assembly, the mover 32 may be in an unstable state due to external disturbances or internal electromagnetic forces. By adjusting the gain coefficient, the image stabilization unit drive controller can actively suppress minor vibrations, keeping the mover 32 fixed in a controllable position. This prevents the lens 20 from shifting during initial placement due to shaking, thus improving the repeatability and accuracy of subsequent position measurements.

[0126] Specifically, the motor 30 is powered on, and the image stabilization drive controller drives the mover 32 to actively detect the extreme positions along the first direction (X-axis direction) and the second direction (Y-axis direction) perpendicular to the optical axis 24, accurately calibrating the effective travel range of the mover 32. Based on the calibrated effective travel range, the target magnetic position value of the mover 32 within the effective travel range is calculated. The image stabilization drive controller is used to control the mover 32 to move to the target magnetic position, completing the redistribution of the travel center position for image stabilization. This ensures that the mover 32 is truly in the actual travel center position when the lens 20 is in the assembled state, avoiding excessive offset that could cause the lens 20 to collide with the inner wall 3211 of the mover through-hole, thus preventing interference with the active calibration adjustment of the lens 20.

[0127] Based on the above-mentioned camera module assembly method and the method for finding the center position of the stroke of the mover 32, such as Figures 6-9 As shown, this application also provides a camera module, including: a photosensitive component 10, a lens 20, and a motor 30, wherein the motor 30 is mounted on the photosensitive component 10, and the lens 20 is disposed on the photosensitive component 10 and located inside the motor 30.

[0128] Furthermore, the camera module also includes a protective element 40 that covers the lens 20 located within the motor 30 to protect the lens 20 from dust, moisture, and other contaminants entering the lens 20.

[0129] Furthermore, such as Figure 7 and Figure 8 As shown, the photosensitive assembly 10 includes a photosensitive chip 11 and a module base 12. The photosensitive chip 11 includes a photosensitive surface 111 and a pixel array located on the photosensitive surface 111. The pixel array is composed of a large number of pixel units arranged in a matrix, and each pixel unit contains photoelectric conversion elements such as photodiodes. The pixel array 112 has a physical center, which is usually located at the geometric center of the pixel array, that is, the center of the photosensitive chip 11.

[0130] Furthermore, the module base 12 is used to support and fix the photosensitive chip 11 and provide electrical connection. The module base 12 also includes a circuit board 121 and electronic devices 122 disposed on the circuit board 121.

[0131] In some embodiments, the photosensitive chip 11 is fixed to the circuit board 121 with its photosensitive surface 111 facing upwards to receive light from the lens 20. The photosensitive chip 11 and the circuit board 121 can be fixed together with adhesive and electrically connected by leads or solder joints. Furthermore, to prevent stray light and dust from entering the photosensitive surface 111, a filter, such as an infrared cut-off filter, is typically placed above the photosensitive chip 11. The filter can be packaged together with the photosensitive chip 11 or placed separately.

[0132] Furthermore, such as Figures 7-9 As shown, the motor 30 includes a housing 31, a mover 32, a drive mechanism 33, and a motor base 34. The housing 31 includes a housing sidewall 311, a housing bottom 312, and a housing top 313, forming a hollow receiving space for accommodating components such as the drive mechanism 33, the mover 32, and a position sensor. Specifically, some components of the drive mechanism 33 (such as a magnet) are fixed to the inner wall surface of the housing sidewall 311. The mover 32 is disposed between the drive mechanism 33 and the lens 20, and the mover 32 has a mover through-hole 321 for assembling the lens 20. It should be understood that the mover 32 is a movable part, and the lens 20 is fixed in the mover through-hole 321 and moves with the mover 32 to achieve optical image stabilization.

[0133] Furthermore, the motor base 34 is fixed to the inner side of the bottom 312 of the housing for mounting the motor 30 to the top of the photosensitive component 10 to obtain a motor-photosensitive component. The lower surface of the motor base 34 and the upper surface of the photosensitive component 10 have a mounting gap d1, that is, the Z-direction vertical distance (d1) between the lower surface of the motor base 34 and the upper surface of the photosensitive component 10. The gap d1 is suitable for filling with a first adhesive layer 50, and the gap d1 is determined by the thickness of the first adhesive layer 50. In this application, the minimum gap d1 between the motor 30 and the photosensitive component 10 can be the thickness of the adhesive after physical bonding, such as 20~30 μm, and the maximum gap can be controlled within 50 μm, that is, the axial gap between the motor 30 and the photosensitive component 10 is less than 50 μm.

[0134] Specifically, the method for obtaining the motor photosensitive component of this application includes: First, obtaining the pre-fabricated photosensitive component 10 and motor 30. The photosensitive component 10 is typically fixed to the circuit board 124 by soldering or mounting, ensuring that the photosensitive chip 11 is flat. Using a mechanical fixture or vision system, the motor base 34 is initially aligned to the mounting position of the photosensitive component 10. At this time, a small gap (target less than 50μm) is reserved between the two to fill with glue and accommodate adjustment allowance.

[0135] Power is supplied to the drive mechanism 33 (focusing and image stabilization units), causing the mover 32 to move to its initial center position. A high-precision vision system (such as a CCD camera) simultaneously detects the center (physical center) of the mover 32 and the center of the photosensitive chip 11. The system compares the two positions, and if there is a deviation, it corrects it by fine-tuning the pose of the motor base 34 (such as X / Y translation or Z-axis tilt) until the center of the mover 32 is coaxially aligned with the center of the photosensitive chip 11.

[0136] First, apply adhesive to the surface of the photosensitive component 10 (corresponding to the bonding area of ​​the motor base 34). Then, move the motor 30 above the photosensitive component 10, calibrate the position, and press the motor 30 down onto the surface of the photosensitive component 10 to cure the adhesive. That is, a first adhesive layer 50 is formed on the contact surface (gap d1) between the motor base 34 and the photosensitive component 10, and the motor 30 is fixed on the photosensitive chip 11 to obtain a motor chip assembly with small tolerance accumulation.

[0137] It should be understood that in this application, the camera module is first assembled from the motor 30 to the photosensitive component 10. The flatness tolerance of the circuit board 121, the flatness tolerance of the motor base 34, and the thickness tolerance of the first adhesive layer 50 are all much smaller than in traditional processes. The gap d1 can be significantly reduced, controlled within 50μm. The significant reduction in gap d1 results in a significant decrease in the shoulder height of the camera module, which helps to achieve the thinner and lighter design of mobile phones and other terminal devices. In addition, the thinner the first adhesive layer 50, the smaller its absolute shrinkage, and the smaller the tensile deformation of the motor 30 and the photosensitive component 10.

[0138] It is worth mentioning that large aperture lenses (such as F1.4 and F1.6) are extremely sensitive to tilt deviation. In this embodiment, by reducing the thickness of the first adhesive layer by 50, the tilt deviation is reduced to within 10′, which meets the strict requirement of an aperture of not less than F1.6, enabling the camera module to be adapted to more advanced optical designs.

[0139] Furthermore, such as Figure 8 As shown, lens 20 includes lens group 22, lens barrel 21, and lens outer wall 23. Lens group 22 is composed of multiple lenses arranged sequentially along optical axis 24, used to converge light and form a clear image on image sensor 11. Lens group 22 is disposed in lens barrel 21, and each lens is axially positioned by a step or spacer ring inside lens barrel 21 and fixed by adhesive. Lens 20 has an optical axis 24, which is the axis passing through the optical center of lens 20 and is the line connecting the centers of each lens in lens group 22.

[0140] Furthermore, such as Figure 9As shown, the mover 32 includes a mover through hole 321, which is a central hole penetrating the mover 32 and used to accommodate the lens 20. The inner diameter of the mover through hole 321 is slightly larger than the outer diameter of the lens barrel 21 of the lens 20, and there is a radial gap d2 between them. The gap d2 provides the necessary movement space for the lens 20 during AA adjustment.

[0141] It is understandable that if the radial clearance d2 is too large, it will lead to an increase in module size, while if it is too small, it may cause interference during AA adjustment or optical image stabilization.

[0142] Furthermore, such as Figure 9 As shown, the mover 32 includes a mover through hole 321 and a mover through hole inner wall 3211 located inside the mover through hole 321. The lens outer wall 23 is the outer side of the lens barrel 21. The radial gap d2 between the lens outer wall 23 and the mover through hole inner wall 3211 is bonded with glue to form a second adhesive layer 60 for fixing the lens 20 in the mover 32. That is, the second adhesive layer 60 is located between the outer peripheral surface of the lens outer wall 23 and the inner surface of the mover 32 facing the lens 20, so that after the lens 20 is fixed to the mover 32, the lens 20 and the mover 32 can move relative to the bottom photosensitive component 10.

[0143] In this application, the second adhesive layer 60, after complete curing between the lens outer wall 23 and the inner wall 3211 of the moving part through hole, is controlled to be within 60 μm, preferably within 50 μm.

[0144] Furthermore, after the lens 20 is inserted, the target magnetic position value of the mover 32 is re-determined using the method proposed in this application, which involves re-finding the center of travel of the mover 32. This completes the redistribution of the center of travel position of the mover 32 by the image stabilization unit. It should be understood that, in order to miniaturize the camera module, the reserved gap between the outer wall 23 of the lens and the inner wall 3211 of the mover through hole is designed to be very small. Due to such a small gap, the lens barrel 21 becomes a physical boundary for the movement of the mover 32. The mover 32 can no longer reach its theoretical maximum travel limit because before that, the lens barrel 21 will interfere (collide) with the mover 32. Therefore, it is necessary to redetermine the actual center of travel position of the mover 32.

[0145] It is worth mentioning that before the camera module lens 20 is assembled into the mover 32, pre-applied adhesive is applied. After calibrating the tilt angle and offset between the lens 20 and the photosensitive chip 11, and ensuring that the image quality acquired by the photosensitive chip 11 meets the preset requirements, the adhesive between the lens 20 and the mover 32 is pre-cured. After pre-curing, further adhesive reinforcement can be applied to form a stable second adhesive layer 60, thereby improving the fixing strength between the lens 20 and the mover 32.

[0146] In some embodiments, the adhesive used for pre-curing and reinforcement may be a dot adhesive, UV adhesive, epoxy adhesive, acrylic adhesive, polyurethane adhesive, or ring adhesive.

[0147] In some embodiments, pre-curing can be achieved using dotted adhesive, which consists of discretely distributed adhesive dots. Typically, 3-6 dots are symmetrically distributed on the contact surface between the lens outer wall 23 and the mover 32. This is used for initial positioning and pre-curing, and the curing speed is fast, allowing the lens 20 to be quickly fixed in the optimal position determined by AA adjustment. Preferably, the dotted adhesive is a UV-curable adhesive, which has a low shrinkage rate and allows for light transmission during curing, facilitating quality monitoring.

[0148] In some embodiments, a ring-shaped adhesive can be used for reinforcement. The ring-shaped adhesive is a continuous annular layer that is continuously distributed around the circumference of the contact surface between the outer wall of the lens 23 and the inner wall of the mover through hole 3211. The ring-shaped adhesive is used for reinforcement and complete curing, providing a larger bonding area and bonding strength, and ensuring the reliability of the connection between the lens 20 and the mover 32.

[0149] In some embodiments, the ring-shaped adhesive is typically applied after the dot-shaped adhesive has been pre-cured, using a thermosetting adhesive or a two-component adhesive, which, after curing, has higher mechanical strength, better temperature resistance, and impact resistance.

[0150] In some embodiments, a combination of "dot-shaped adhesive pre-curing + ring-shaped adhesive reinforcement curing" is preferred to balance assembly efficiency and connection reliability.

[0151] It is worth mentioning that the center of the mover 32 is the geometric center of the mover through-hole 321, and also the physical center of the mover 32. Ideally, when the mover 32 is at the center of its travel, the center of the mover 32 should be aligned with the center of the photosensitive chip 11 along the optical axis 24. With the center of the mover 32 and the center of the photosensitive chip 11 coinciding, the lens 20 is assembled, and the position of the lens 20 is adjusted so that the optical center of the lens 20 coincides with the center of the photosensitive chip 11 and the center of the mover 32. This results in high assembly precision and small tolerance accumulation in the camera module.

[0152] Furthermore, such as Figure 9 As shown, the mover 32 also includes a mover sidewall 322, which is the outer wall surface of the mover 32. Some components of the drive mechanism 33 (such as a coil) are fixed on its outer surface. A certain gap is maintained between the mover sidewall 322 and the outer shell sidewall 311 to allow the mover 32 to move relative to the outer shell 31.

[0153] Furthermore, the drive mechanism 33 includes a coil and a magnet, which interact to drive the mover 32 to move relative to the housing 31 in the XY plane to achieve optical image stabilization.

[0154] It is worth mentioning that, based on the camera module assembly method of this application, the optical axis 24 of the camera module is perpendicular to the photosensitive surface 111 of the photosensitive chip 11 and coincides with the center of the photosensitive chip 11. The optical center of the lens 20 is the intersection of the optical axis 24 and the center of the lens 20. After the camera module is assembled, the optical center, the center of the mover 32, and the center of the photosensitive chip 11 are aligned along the optical axis 24, and the deviation is controlled within a small range.

[0155] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A method for assembling a camera module, characterized in that, Includes the following steps: S1. Provide a motor chip assembly, including a mover that can move relative to the photosensitive chip; S2. Drive the mover to the initial center position, where the center of the mover is aligned with the center of the photosensitive chip along the optical axis, and assemble the lens into the mover so that the initial position of the lens is within the central through hole of the mover; S3. Repeat the following steps: S31. Adjust the position of the lens relative to the photosensitive chip to calibrate the tilt angle and offset of the lens relative to the photosensitive chip; S32. Drive the mover to the center position of the stroke, so that the gap between the mover and the lens is evenly distributed; The loop continues until the image quality acquired by the photosensitive chip meets the preset requirements and the gap between the moving part and the lens is evenly distributed, at which point the loop ends. S4. The pre-set adhesive between the moving part and the lens is cured to fix the relative position of the lens and the moving part, thereby obtaining the camera module; In step S31, before calibrating the lens, the mover is adjusted to its natural state by de-energizing the image stabilization unit of the motor. After applying glue at the predetermined contact position between the mover and the lens, the lens is assembled into the mover. In step S32, before adjusting the gap between the mover and the lens, the mover is driven to move by energizing the image stabilization unit of the motor.

2. The assembly method of the camera module according to claim 1, characterized in that, Between steps S31 and S32, there is also a step of finding the center position of the mover's stroke, specifically including: S301. Power on the motor, turn on its anti-shake drive controller, and adjust the gain coefficient of the anti-shake drive controller to keep the mover stable; S302. Drive the mover to move to its extreme position along a first direction and a second direction perpendicular to the optical axis, respectively, obtain the magnetic potential value corresponding to each extreme position, and calculate the target magnetic potential value corresponding to the center position of the mover's stroke based on the magnetic potential value of each extreme position; S303. Control the mover to move to the position corresponding to the target magnetic position value, complete the repositioning of the stroke center position, so that the gap between the mover and the lens is evenly distributed.

3. The assembly method of the camera module according to claim 1, characterized in that, The S3 step is repeated at least twice. After the S3 step is completed, when the moving part is at the center of the stroke, the radial gap between the lens and the moving part is less than 60 μm.

4. The assembly method of the camera module according to claim 1, characterized in that, The motor chip assembly in step S1 is assembled through the following steps: S11. Provides a motor and a photosensitive component; S12. Power on the motor to drive the mover to the initial center position, assemble the motor to the photosensitive component, and obtain the motor chip assembly.

5. The assembly method of the camera module according to claim 4, characterized in that, The axial gap between the motor and the photosensitive component is less than 50 μm.

6. The assembly method of the camera module according to claim 1, characterized in that, After step S4 is completed, the center of the moving part, the optical center of the lens, and the center of the photosensitive chip are aligned.

7. The assembly method of the camera module according to claim 1, characterized in that, In step S3, the preset requirement for image quality is that the modulation transfer function (MTF) values ​​of each preset region of the image acquired by the photosensitive chip all reach a preset threshold.

8. The assembly method of the camera module according to claim 1, characterized in that, The S4 step includes: S41. Keep the moving part at the center of the stroke position and solidify the pre-set adhesive between the lens and the moving part; S42. Apply reinforcing adhesive between the lens and the moving part; S43. Completely cure the adhesive between the lens and the moving part.

9. A camera module, characterized in that, The camera module includes a motor assembly, a photosensitive assembly, and a lens. The motor assembly, the photosensitive assembly, and the lens are assembled using the assembly method described in any one of claims 1-8. The tilt angle deviation of the camera module is less than 10°. 。 .

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