Control method for camera module

Abstract

The present invention provides a control method for a camera module. The method comprises: providing on a mobile carrier one of a magnetic component and a multi-coil assembly, providing on a base the other one of the magnetic component and the multi-coil assembly, the multi-coil assembly comprising at least two sub-coil groups stacked up and down, so as to achieve smaller resistance and greater driving force than a single coil assembly having the same number of turns; when the mobile carrier is located at an initial position, providing a driving current for at least part of the sub-coil groups in the multi-coil assembly so as to drive the mobile carrier to leave the initial position; and after the mobile carrier leaves the initial position, regulating the magnitude, direction or on-off of the driving current of the at least part of the sub-coil groups, so as to drive the mobile carrier to reach an optimal motion state. Therefore, in the case of application having different requirements, the present invention can provide different driving forces to drive the mobile carrier to drive a lens assembly to move up and down in an optical axis direction for focusing, thereby satisfying different performance requirements.

Description

Camera module control method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 16, 2023, with application number 202311036368.9 and invention name “Control method of camera module”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of camera modules, and in particular to a control method of a camera module. Background Art

[0003] With the rapid development of the smartphone industry, people's requirements for mobile phone camera imaging effects are gradually increasing. Compared with traditional camera systems, cell phone camera modules (CCMs) are widely used in various new-generation portable camera devices due to their advantages such as miniaturization, low power consumption, low cost and high image quality.

[0004] Currently, the structure of a camera module includes a lens unit, a voice coil motor (VCM), an infrared cutoff filter, an image sensor, a flexible printed circuit board (FPC) or a printed circuit board (PCB), and a connector connected to the mobile phone motherboard. Among them, the voice coil motor is used to realize the autofocus function of the lens unit, and the voice coil motor generally includes a magnet, a coil and other structures. During the operation of the camera module, a current is first passed through the coil. The energized coil cuts the magnetic flux lines in the magnetic field to generate electromagnetic force. The coil or magnet moves under the action of the electromagnetic force, thereby driving the lens unit connected to the voice coil motor to move, adjusting the image distance and object distance of the camera module to present a clear image. Usually, a magnetic sensor can also be set in the voice coil motor. The magnetic sensor is used to measure the changes in the magnetic field in the voice coil motor. The position of the coil or magnet is determined based on the changes in the magnetic field, thereby realizing closed-loop control of the voice coil motor. The most common is that the autofocus function in the mobile phone camera is completely completed by the entire driver.

[0005] With the rapid development of the smartphone industry, people's requirements for the imaging effects of mobile phone cameras are gradually increasing. The telescopic camera module can increase the stroke of the lens, thereby having a wider shooting focus range, but the driving force required for the camera module to focus on a large stroke is large, and thus the power consumption is also large. In addition, in order to prevent the lens unit from sliding outward or accidentally thrown out when the camera module is not working, it is often necessary to set a locking structure in the camera module to lock the moving parts in the initial position. Therefore, in the initial stage of the focusing movement, a large driving force is particularly required to drive the moving parts out of the initial position and release the lock. In addition, the driving force required is different at different stages of the focusing movement, and it is often difficult for the moving parts to reach the optimal movement state.

[0006] The present invention mainly aims at solving this problem and optimizes the control method of the camera module.

[0007] Summary of the Invention

[0008] The object of the present invention is to provide a control method for a camera module for a large-stroke motor to achieve an optimal motion state and meet various performance requirements.

[0009] The present invention provides a control method for a camera module, the camera module comprising: a base; a movable carrier, the movable carrier being used to drive a lens assembly to move up and down along an optical axis to achieve focusing; a magnetic component and a multi-coil assembly arranged relatively to each other, the movable carrier being provided with one of the magnetic component and the multi-coil assembly, and the base being provided with the other of the magnetic component and the multi-coil assembly, the multi-coil assembly comprising at least two sub-coil groups stacked up and down; the control method comprising: when the movable carrier is in an initial position, providing a driving current to at least some of the sub-coil groups in the multi-coil assembly to drive the movable carrier out of the initial position; after the movable carrier leaves the initial position, adjusting the magnitude, direction or on / off of the driving current of at least some of the sub-coil groups so that the movable carrier reaches an optimal motion state.

[0010] Preferably, the at least two sub-coil groups stacked up and down are located on the inner side, outer side or both sides of the magnetic component.

[0011] Preferably, the multi-coil assembly includes a first sub-coil group located inside the magnetic component, a second sub-coil group located below the outside of the magnetic component, and a third sub-coil group located above the outside of the magnetic component.

[0012] Preferably, the magnetic component is arranged on the movable carrier, and the multi-coil assembly is arranged on the base around the movable carrier.

[0013] Preferably, when the mobile carrier moves upward away from the initial position, the driving current of at least a portion of the sub-coil groups located below is reduced or turned off to save driving power consumption.

[0014] Preferably, when the mobile carrier moves upward away from the initial position, the driving current of at least a portion of the sub-coil group located above is turned on or increased to increase the driving force.

[0015] Preferably, when the movable carrier moves upward away from the initial position, the driving current direction of at least part of the sub-coil groups is changed to increase the driving force.

[0016] Preferably, when the mobile carrier moves downward near the initial position, the driving current of at least a portion of the sub-coil group located below is turned on or increased to improve the movement stability.

[0017] Preferably, the camera module further includes a locking component, which locks the movable carrier at the initial position, and the movable carrier is unlocked when it leaves the initial position.

[0018] Preferably, the locking assembly is a magnetic locking assembly, the magnetic component is arranged on the mobile carrier, and the magnetic locking assembly is arranged on the base at a position opposite to the magnetic component. Locking is achieved through the attraction between the magnetic component and the magnetic locking assembly, thereby locking the mobile carrier in the initial position.

[0019] Preferably, the locking assembly is one or more of a solenoid valve locking assembly, a spring locking assembly or a memory alloy locking assembly.

[0020] Preferably, the magnetic component includes magnets uniformly distributed around the mobile carrier.

[0021] Preferably, the magnetic component further includes a yoke embedded in the movable carrier, and the yoke is arranged corresponding to the magnet.

[0022] Preferably, the movable carrier is further provided with guide rails evenly distributed around the movable carrier, and rolling contact or sliding contact is formed between the guide rails and the base via rolling elements to stabilize the direction of movement of the movable carrier along the optical axis.

[0023] Preferably, a magnetic sensor is further provided on the base, and an induction magnet is further provided on the movable carrier. The magnetic sensor is arranged corresponding to the induction magnet, and the position of the induction magnet is monitored and fed back by the magnetic sensor to form a closed-loop control on the movement of the lens assembly.

[0024] Preferably, a conductive wire buried layer is also provided on the base, one end of the conductive wire buried layer is connected to the multi-coil assembly, and the other end is connected to the focus control chip, and the driving current of each sub-coil group in the multi-coil assembly is controlled by the focus control chip.

[0025] Based on the above considerations, the control method of the camera module provided by the present invention is provided by providing one of a magnetic component and a multi-coil assembly on a mobile carrier, and providing the other of the magnetic component and the multi-coil assembly on a base, wherein the multi-coil assembly includes at least two sub-coil groups stacked up and down, and compared with a single coil assembly with the same number of turns, it can achieve lower resistance and greater driving force, and when the mobile carrier is in an initial position, a driving current is provided to at least part of the sub-coil groups in the multi-coil assembly to drive the mobile carrier out of the initial position; after the mobile carrier leaves the initial position, the driving current size, direction or on-off of at least part of the sub-coil groups is adjusted so that the mobile carrier reaches an optimal motion state, so that different driving forces can drive the mobile carrier to drive the lens assembly to move up and down along the optical axis for focusing in different application conditions, thereby meeting different performance requirements. Preferably, when a moving magnet design is adopted, the mobile carrier and the magnetic component as the mover part do not need to be conductively connected, and the base and the multi-coil assembly as the stator part can be connected by static conductive connection, reducing the overall assembly difficulty and improving the reliability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments when read with reference to the accompanying drawings.

[0027] FIG1 is an exploded view of a camera module of the present invention;

[0028] FIG2 is a schematic diagram of a mobile carrier in a camera module of the present invention;

[0029] FIG3 is a schematic diagram of a magnetic component in a camera module of the present invention;

[0030] FIG4 is a schematic diagram of a base and a coil in a camera module of the present invention;

[0031] FIG5 is a schematic diagram of a magnet and a coil in a camera module of the present invention;

[0032] FIG6 is a schematic diagram of a locking assembly in a camera module of the present invention;

[0033] 7 to 11 are process diagrams of an embodiment of a camera module control method of the present invention.

[0034] In the drawings, the same or similar reference numerals denote the same or similar devices (modules) or steps throughout different drawings. DETAILED DESCRIPTION

[0035] The following description sets forth numerous specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific implementations disclosed below.

[0036] Secondly, the present invention is described in detail using schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the schematic diagrams are only examples and should not limit the scope of protection of the present invention.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the method of the present invention is described in detail below with reference to the accompanying drawings.

[0038] FIG1 is an overall exploded view of a camera module according to a preferred embodiment of the present invention, FIG2 to FIG6 are partial schematic diagrams of main components of the camera module, and FIG7 to FIG11 are process schematic diagrams of an embodiment of a method for controlling the camera module.

[0039] 1 to 5 , the camera module of the present invention includes a base 106 and a movable carrier 101 . The movable carrier 101 is used to drive the lens assembly 102 to move up and down along the optical axis (Z direction in FIG. 1 ) to achieve focusing.

[0040] The camera module of the present invention further includes a magnetic component 103 and a multi-coil assembly 107 disposed in opposition to each other. This description will be made using a moving magnetic structure in which the magnetic component 103 is disposed on the mobile carrier 101 and the multi-coil assembly 107 is disposed on the base 106 as an example. Those skilled in the art will appreciate that, in other embodiments not shown, a moving coil structure with the opposite arrangement may also be employed, i.e., the multi-coil assembly 107 is disposed on the mobile carrier 101 and the magnetic component 103 is disposed on the base 106. In short, as long as one of the magnetic component 103 and the multi-coil assembly 107 is disposed on the mobile carrier 101 and the other of the magnetic component 103 and the multi-coil assembly 107 is disposed on the base 106, the objectives of the present invention can be achieved.

[0041] The magnetic component 103 on the mobile carrier 101 includes magnets 104 evenly distributed around the mobile carrier 101. Here, a single magnet 104 is shown evenly distributed on the four sides of the mobile carrier 101. Those skilled in the art will appreciate that, as needed, the magnets 104 may also be implemented as a magnet group, or may be symmetrically distributed on the two sides, two corners, or four corners of the mobile carrier 101. Preferably, the magnetic component 103 also includes a magnetic yoke 105 disposed corresponding to the magnet 104 and embedded in the mobile carrier 101 to make the magnetic field more uniform.

[0042] The multi-coil assembly 107 on the base 106 surrounds the mobile carrier 101 and includes a first sub-coil assembly 107A located inside the magnet 104, a second sub-coil assembly 107B located below and outside the magnet 104, and a third sub-coil assembly 107C located above and outside the magnet 104. The second sub-coil assembly 107B and the third sub-coil assembly 107C are stacked one on top of the other. The multi-coil assembly achieves lower resistance and greater driving force compared to a single coil assembly with the same number of turns.

[0043] The control method of the camera module of the present invention includes: when the mobile carrier 101 is in the initial position, providing a driving current to at least some of the sub-coil groups in the multi-coil assembly 107 to drive the mobile carrier 101 out of the initial position; after the mobile carrier 101 leaves the initial position, by adjusting the magnitude, direction or on-off of the driving current of at least some of the sub-coil groups, the mobile carrier 101 reaches an optimal motion state. In this way, different driving forces can be used to drive the mobile carrier to move the lens assembly up and down along the optical axis for focusing in different application situations, thereby realizing a long-stroke motor that can meet different performance requirements.

[0044] For the dynamic magnetic structure in which the magnetic component 103 is arranged on the mobile carrier 101 and the multi-coil assembly 107 is arranged on the base 106, when the mobile carrier 101 is in the initial position, the magnet 104 on the mobile carrier 101 is located at the bottom of the base, closer to the sub-coil groups 107A and 107B located below (see Figure 7); in the process of the mobile carrier 101 moving upward with the magnet 104, it gradually moves away from the sub-coil groups 107A and 107B located below and approaches the sub-coil group 107C located above (see Figures 8-10).

[0045] Therefore, preferably, when the mobile carrier 101 is located at the initial position, a driving current is provided to some of the sub-coil groups 107A, 107B or all of the sub-coil groups 107A, 107B, and 107C located at the bottom in the multi-coil assembly 107 to provide a larger driving force and drive the mobile carrier 101 to leave the initial position as soon as possible; after the mobile carrier 101 leaves the initial position, in the process of moving upward away from the initial position, the driving power consumption can be saved by reducing or shutting down the driving current of at least some of the sub-coil groups 107A and 107B located at the bottom.

[0046] Further preferably, when the mobile carrier 101 moves upward away from the initial position, the driving current of at least a portion of the sub-coil group 107C located above can be turned on or increased to increase the driving force and improve the focusing speed.

[0047] Further preferably, in the process of the mobile carrier 101 moving upward away from the initial position, the driving current direction of at least part of the sub-coil groups can be changed to increase the driving force and improve the focusing speed.

[0048] Further preferably, when the mobile carrier 101 moves downward near the initial position, the movement stability can be improved by turning on or increasing the driving current of at least part of the sub-coil groups 107A and 107B located below.

[0049] The control method of the camera module of the present invention is described in detail below with reference to specific embodiments:

[0050] Example 1: When the mobile carrier 101 is in the initial position, driving current is supplied to all sub-coil groups 107A, 107B, and 107C in the multi-coil assembly 107, thereby using a large driving force to drive the mobile carrier 101 to break free from the static inertia or the force locking the mobile carrier 101 in the initial position, thereby driving the mobile carrier 101 to quickly break free from the initial position and move upward along the optical axis Z direction;

[0051] After the mobile carrier 101 leaves the initial position, the driving current provided to the first sub-coil group 107A and the second sub-coil group 107B located below is reduced, and the driving current provided to the third sub-coil group 107C located above is increased, so as to drive the mobile carrier 101 to continue to move stably along the optical axis Z direction to perform the focusing task while saving driving power consumption.

[0052] Embodiment 2: When the mobile carrier 101 is in the initial position, a driving current is provided to the first sub-coil group 107A and the second sub-coil group 107B located below, thereby using a large driving force to drive the mobile carrier 101 to break free from the static inertia or the force locking the mobile carrier 101 in the initial position, thereby driving the mobile carrier 101 to quickly break free from the initial position and move upward along the optical axis Z direction;

[0053] After the mobile carrier 101 leaves the initial position, the driving current is stopped from being supplied to the first sub-coil group 107A and the second sub-coil group 107B located below, and the driving current is started to be supplied to the third sub-coil group 107C located above, so as to drive the mobile carrier 101 to continue to move stably along the optical axis Z direction to perform the focusing task while saving driving power consumption.

[0054] Example 3: Referring to FIG7 , when the mobile carrier 101 is in the initial position, the magnet 104 is located at the bottom of the first sub-coil group 107A and the second sub-coil group 107B, and provides driving current to all the sub-coil groups 107A, 107B, and 107C in the multi-coil assembly 107. The driving currents of the first sub-coil group 107A and the second sub-coil group 107B are forward currents, while the driving current of the third sub-coil group 107C is reverse current. A larger driving force is used to drive the mobile carrier 101 to break free from the static inertia or the force locking the mobile carrier 101 in the initial position, thereby driving the mobile carrier 101 to break free from the initial position as quickly as possible and move upward along the optical axis Z.

[0055] When the movable carrier 101 gradually moves away from the initial position and upward to the position shown in FIG8 , the magnet 104 gradually moves away from the first sub-coil group 107A and approaches the third sub-coil group 107C. By changing the driving current of the first sub-coil group 107A to a reverse current and the driving current of the third sub-coil group 107C to a forward current, the driving force can be increased and the focusing speed can be improved.

[0056] When the movable carrier 101 continues to move upward away from the initial position to the position shown in FIG9 , the magnet 104 continues to move away from the second sub-coil group 107B. By changing the driving current of the second sub-coil group 107B to a reverse current, the driving force can be further increased, thereby improving the focusing speed.

[0057] When the mobile carrier 101 continues to move upward away from the initial position to the position shown in FIG10 , the magnet 104 has completely passed over the first sub-coil group 107A and the second sub-coil group 107B. By turning off the driving current of the first sub-coil group 107A and the second sub-coil group 107B, driving power consumption can be saved.

[0058] As the mobile carrier 101 moves downward near the initial position, as shown in FIG11 , the magnet 104 gradually approaches the first sub-coil group 107A and the second sub-coil group 107B. By turning on the driving current of the first sub-coil group 107A and the second sub-coil group 107B and providing a smaller reverse current, the mobile carrier can descend smoothly and improve the movement stability.

[0059] In addition, in this embodiment, in each stage of the above-mentioned focusing movement, the magnitude of the current can be adjusted to achieve rapid or smooth up and down movement of the mobile carrier.

[0060] In addition, for the dynamic coil structure in which the multi-coil assembly 107 is arranged on the mobile carrier 101 and the magnetic component 103 is arranged on the base 106, during the movement of the mobile carrier 101 along the optical axis, the relative position relationship between the magnetic component 103 and each sub-coil group in the multi-coil assembly 107 is different from that of the dynamic magnetic structure, but the design principle is similar. Those skilled in the art can make settings according to actual conditions and reasonably adjust the driving current size, direction or on-off of each sub-coil group to enable the mobile carrier to achieve the optimal motion state. The details will not be repeated here.

[0061] Those skilled in the art will appreciate that the above-described arrangement of the first sub-coil group 107A, the second sub-coil group 107B, and the third sub-coil group 107C is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art may reasonably configure the number and positions of the sub-coil groups in the multi-coil assembly 107 based on actual requirements such as the size, space, and driving capability of the camera module. As long as the multi-coil assembly 107 includes at least two sub-coil groups stacked one above the other, the present invention can be implemented. For example, two sub-coil groups stacked one above the other may be disposed on the inner side of the magnet 104, or a sub-coil group stacked one above the other, possibly overlapping left and right or inside and outside, may be disposed on the outer side of the magnet 104. Alternatively, three sub-coil groups may be disposed, or two sub-coil groups stacked one above the other may be disposed on either side of the magnet 104. Each sub-coil group may include coils in various numbers and arrangements, which are not enumerated here, but are all intended to be within the scope of protection of the present invention.

[0062] The control method of the camera module of the present invention is not limited to the above-mentioned embodiments. Those skilled in the art can, based on the specific settings of the sub-coil groups in the multi-coil assembly, provide driving current to at least part of the sub-coil groups in the multi-coil assembly 107 when the mobile carrier 101 is in the initial position to drive the mobile carrier 101 out of the initial position; after the mobile carrier 101 leaves the initial position, the driving current size, direction or on-off of at least part of the sub-coil groups is adjusted to make the mobile carrier 101 reach the optimal motion state. In this way, in application situations with different requirements, different driving forces can be used to drive the mobile carrier to drive the lens assembly to move up and down along the optical axis for focusing, thereby realizing a large-stroke motor that can meet different performance requirements.

[0063] 1 and 6 , the camera module of the present invention may further include a locking assembly 108 , which is shown here as a magnetic locking assembly 108 , and is arranged on the base 106 at a position opposite to the magnet 104 , and is shown here as two magnetic locking assemblies 108 , which are symmetrically arranged on both sides of the base 106 , corresponding to two magnets 104 respectively. Those skilled in the art may also adjust the number of magnetic locking assemblies 108 as needed. For example, four magnetic locking assemblies 108 are evenly distributed on the four sides of the base 106 , corresponding to four magnets 104 respectively. Locking is achieved by the attraction between the magnets 104 and the magnetic locking assemblies 108 , thereby locking the mobile carrier 101 in the initial position to prevent it from being accidentally thrown out. When a driving current is provided to the multi-coil assembly, after the mobile carrier 101 leaves the initial position under the action of a larger driving force, the attraction between the magnet 104 and the magnetic locking assembly 108 gradually decreases, and the lock is released.

[0064] In other embodiments not shown, the locking assembly may also be one or more of a solenoid valve locking assembly, a spring locking assembly, or a memory alloy locking assembly.

[0065] 3 and 4 , the mobile carrier 101 is further provided with guide rails 111 evenly distributed around the mobile carrier 101. Here, four guide rails 111 are shown, located at the four corners of the mobile carrier 101. The two guide rails 111 on the same side form rolling contact with the base 106 via rollers 109, and the two guide rails 111 on the other side form rolling contact with the base 106 via balls 110. Those skilled in the art may also adjust the number of guide rails 111 as needed. For example, two guide rails 111 may be symmetrically distributed at the two corners of the mobile carrier 101. The guide rails 111 and the base 106 may also form rolling or sliding contact via other rolling elements to stabilize the direction of movement of the mobile carrier 101 along the optical axis. Preferably, the guide rails 111 and the yoke 105 may be a common structure, integrally formed with a magnetic conductive material, and embedded in the mobile carrier 101 to reduce assembly difficulty.

[0066] In addition, a conductive wire buried layer (not shown) can be provided on the base 106, one end of the conductive wire buried layer is connected to the multi-coil assembly 107, and the other end is connected to the focus control chip (not shown) in the control unit, thereby controlling the driving current of each sub-coil group in the multi-coil assembly 107 through the focus control chip.

[0067] Since this embodiment preferably adopts a dynamic magnetic design, the moving carrier 101 and the magnet 104 as the mover part do not need to be conductively connected, so the rolling elements 109 and 110 between the guide rail 111 and the base 106 can be made of non-conductive materials, such as ceramics; the base 106 and the multi-coil assembly 107 as the stator part can achieve static conductive connection through a conductive wire buried layer, reducing the overall assembly difficulty and improving the reliability of the overall structure.

[0068] In addition, an inductive magnet 120 may be further provided on the mobile carrier 101, and a magnetic sensor (not shown), such as a Hall sensor, may be provided on the base 106. The magnetic sensor may be provided corresponding to the inductive magnet 120, and the position of the inductive magnet 120 may be monitored and fed back by the magnetic sensor, thereby forming a closed-loop control of the movement of the lens assembly 102.

[0069] In summary, the control method of the camera module of the present invention is to provide one of a magnetic component and a multi-coil assembly on a mobile carrier, and to provide the other of a magnetic component and a multi-coil assembly on a base, wherein the multi-coil assembly includes at least two sub-coil groups stacked up and down, and can achieve lower resistance and greater driving force compared to a single coil assembly with the same number of turns, and when the mobile carrier is in an initial position, provide a driving current to at least part of the sub-coil groups in the multi-coil assembly to drive the mobile carrier out of the initial position; after the mobile carrier leaves the initial position, adjust the driving current size, direction or on / off of at least part of the sub-coil groups so that the mobile carrier reaches an optimal motion state, so that different driving forces can be used to drive the mobile carrier to move the lens assembly up and down along the optical axis for focusing in different application conditions, thereby meeting different performance requirements. Preferably, when a moving magnet design is adopted, the mobile carrier and the magnetic component as the mover part do not need to be conductively connected, and the base and the multi-coil assembly as the stator part can be connected by static conductive connection, thereby reducing the overall assembly difficulty and improving the reliability of the overall structure.

[0070] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-restrictive in any manner. Furthermore, it is clear that the word "comprising" does not exclude other elements and steps, and the word "a" does not exclude pluralities. Multiple elements stated in a device claim may also be implemented by a single element. Terms such as first and second are used to indicate names and do not imply any particular order.

Claims

1. A method for controlling a camera module, characterized in that: The camera module comprises: Base; A movable carrier, the movable carrier is used to drive the lens assembly to move up and down along the optical axis to achieve focusing; A magnetic component and a multi-coil assembly are arranged opposite to each other, one of the magnetic component and the multi-coil assembly is arranged on the mobile carrier, and the other of the magnetic component and the multi-coil assembly is arranged on the base, and the multi-coil assembly includes at least two sub-coil groups stacked up and down; The control method comprises: When the mobile carrier is located at an initial position, providing a driving current to at least part of the sub-coil groups in the multi-coil assembly to drive the mobile carrier to leave the initial position; After the mobile carrier leaves the initial position, the driving current of at least part of the sub-coil groups is adjusted in magnitude, direction or on / off so that the mobile carrier reaches an optimal motion state.

2. The camera module control method according to claim 1, characterized in that: The at least two sub-coil groups stacked up and down are located on the inner side, the outer side or both sides of the magnetic component.

3. The control method of the camera module according to claim 2, characterized in that: The multi-coil assembly includes a first sub-coil group located inside the magnetic component, a second sub-coil group located below the outer side of the magnetic component, and a third sub-coil group located above the outer side of the magnetic component.

4. The control method of the camera module according to claim 1, characterized in that: The magnetic component is arranged on the mobile carrier, and the multi-coil assembly is arranged on the base surrounding the mobile carrier.

5. The control method of the camera module according to claim 4, characterized in that: When the mobile carrier moves upward away from the initial position, the driving current of at least a portion of the sub-coil groups located below is reduced or turned off to save driving power consumption.

6. The control method of the camera module according to claim 4, characterized in that: When the mobile carrier moves upward away from the initial position, the driving current of at least a portion of the sub-coil group located above is turned on or increased to increase the driving force.

7. The control method of the camera module according to claim 4, characterized in that: When the mobile carrier moves upward away from the initial position, the driving current direction of at least part of the sub-coil groups is changed to increase the driving force.

8. The method for controlling a camera module according to claim 4, wherein: When the mobile carrier moves downward near the initial position, the driving current of at least a portion of the sub-coil group located below is turned on or increased to improve the movement stability.

9. The camera module control method according to claim 1, wherein: The camera module further comprises a locking assembly, which locks the movable carrier at the initial position, and the movable carrier is released from the initial position.

10. The method for controlling a camera module according to claim 9, wherein: The locking assembly is a magnetic locking assembly, the magnetic component is arranged on the mobile carrier, and the magnetic locking assembly is arranged on the base at a position opposite to the magnetic component. Locking is achieved by the attraction between the magnetic component and the magnetic locking assembly, so that the mobile carrier is locked in the initial position.

11. The method for controlling a camera module according to claim 9, wherein: The locking assembly is one or more of a solenoid valve locking assembly, a spring locking assembly or a memory alloy locking assembly.

12. The control method of the camera module according to claim 4, characterized in that: The magnetic component includes magnets uniformly distributed around the mobile carrier.

13. The control method of the camera module according to claim 12, characterized in that: The magnetic component further includes a yoke embedded in the mobile carrier, and the yoke is arranged corresponding to the magnet.

14. The control method of the camera module according to claim 13, characterized in that: The movable carrier is also provided with guide rails evenly distributed around the movable carrier, and rolling contact or sliding contact is formed between the guide rails and the base through rolling elements to stabilize the direction of movement of the movable carrier along the optical axis.

15. The camera module control method according to claim 1, wherein: The base is also provided with a magnetic sensor, and the mobile carrier is also provided with an induction magnet. The magnetic sensor is arranged corresponding to the induction magnet. The position of the induction magnet is monitored and fed back by the magnetic sensor to form a closed-loop control on the movement of the lens assembly.

16. The method for controlling a camera module according to claim 4, wherein: A conductive wire buried layer is also provided on the base, one end of the conductive wire buried layer is connected to the multi-coil assembly, and the other end is connected to the focus control chip, and the driving current of each sub-coil group in the multi-coil assembly is controlled by the focus control chip.

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