Control method of camera module

Abstract

The invention provides a control method of a camera module, which is characterized in that one of a magnetic component and a multi-coil assembly is arranged on a mobile carrier, the other of the magnetic component and the multi-coil assembly is arranged on a base, and the multi-coil assembly comprises at least two sub-coil groups which are stacked up and down; compared with a single-coil assembly with the same number of turns, the multi-coil assembly has the advantages that smaller resistance and larger driving force can be achieved, and when the moving carrier is located at the initial position, driving current is provided for at least part of sub-coil assemblies in the multi-coil assembly so as to drive the moving carrier to be separated from the initial position; and after the mobile carrier is separated from the initial position, the mobile carrier reaches the optimal motion state by adjusting the magnitude, direction or on-off of the driving current of at least part of the sub-coil groups, so that the mobile carrier can reach the optimal motion state under the application conditions of different requirements. Different driving forces drive the mobile carrier to drive the lens assembly to move up and down along the direction of the optical axis for focusing, so that different performance requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of camera modules, and in particular to a control method of a camera module. Background Art

[0002] 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 (CCM) 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.

[0003] At present, the structure of the 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 usually includes a magnet, a coil and other structures. During the operation of the camera module, the coil is first energized, and 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, and presenting a clear image. Usually, a magnetic sensor can also be set in the voice coil motor, and the magnetic sensor is used to measure the change of the magnetic field in the voice coil motor, and the position of the coil or magnet is judged according to the change of the magnetic field, so as to realize the 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.

[0004] 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 the power consumption is also large. In addition, in order to prevent the lens unit from sliding out 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 to unlock. In addition, the required driving force is different at different stages of the focusing movement, and the moving parts often find it difficult to reach the optimal movement state.

[0005] The present invention mainly aims at this problem and optimizes the control method of the camera module. Summary of the invention

[0006] 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.

[0007] The present invention provides a control method for a camera module, the camera module comprising: a base; a mobile carrier, the mobile carrier is used to drive a lens assembly to move up and down along an optical axis direction to achieve focusing; a magnetic component and a multi-coil assembly are relatively arranged, 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, the multi-coil assembly comprises at least two sub-coil groups stacked up and down; the control method comprises: when the mobile carrier is in 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, by adjusting the driving current size, direction or on-off of at least part of the sub-coil groups, the mobile carrier reaches an optimal motion state.

[0008] Preferably, 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.

[0009] Preferably, the multi-coil assembly comprises 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.

[0010] Preferably, the magnetic component is disposed on the movable carrier, and the multi-coil assembly is disposed on the base surrounding the movable carrier.

[0011] 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.

[0012] Preferably, in the process of the mobile carrier moving upward away from the initial position, the driving current of at least a part of the sub-coil group located above is turned on or increased to increase the driving force.

[0013] Preferably, in the process of the mobile carrier moving 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.

[0014] 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.

[0015] Preferably, the camera module further comprises a locking component, wherein the locking component locks the movable carrier at the initial position, and the movable carrier is unlocked when it leaves the initial position.

[0016] 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, and locking is achieved by the attraction between the magnetic component and the magnetic locking assembly, thereby locking the mobile carrier in the initial position.

[0017] Preferably, the locking assembly is one or more of a solenoid valve locking assembly, a spring locking assembly or a memory alloy locking assembly.

[0018] Preferably, the magnetic component includes magnets uniformly distributed around the mobile carrier.

[0019] Preferably, the magnetic component further comprises a yoke embedded in the movable carrier, and the yoke is arranged corresponding to the magnet.

[0020] 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 through rolling elements to stabilize the direction of movement of the movable carrier along the optical axis.

[0021] Preferably, a magnetic sensor is also provided on the base, and an induction magnet is also provided on the mobile 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.

[0022] 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.

[0023] Based on the above considerations, the control method of the camera module provided by the present invention is provided with one of a magnetic component and a multi-coil assembly on the mobile carrier, and another of a magnetic component and a multi-coil assembly on the base, wherein the multi-coil assembly includes at least two sub-coil groups stacked up and down, and relative to a single coil assembly with the same number of turns, a smaller resistance and a larger driving force can be achieved, and when the mobile carrier is in the 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 is out of 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 the 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 direction for focusing under 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0025] Figure 1 An exploded view of the camera module of the present invention; Figure 2 is a schematic diagram of a mobile carrier in a camera module of the present invention; Figure 3 is a schematic diagram of a magnetic component in a camera module of the present invention; Figure 4 It is a schematic diagram of a base and a coil in a camera module of the present invention; Figure 5 is a schematic diagram of a magnet and a coil in a camera module of the present invention; Figure 6 is a schematic diagram of a locking assembly in a camera module of the present invention; Figure 7-Figure 11 The figure is a process diagram of an embodiment of the camera module control method of the present invention.

[0026] In the drawings, the same or similar reference numerals denote the same or similar devices (modules) or steps throughout different drawings. Implementation

[0027] Many specific details are set forth in the following description to facilitate a full 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 violating the connotation of the present invention, so the present invention is not limited to the specific implementation disclosed below.

[0028] 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.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the method of the present invention is described in detail below with reference to the accompanying drawings.

[0030] Figure 1 is an overall exploded view of a camera module according to a preferred embodiment of the present invention, Figure 2-Figure 6 They are partial schematic diagrams of the main components of the camera module. Figure 7-Figure 11 The figure is a process diagram of an embodiment of the camera module control method.

[0031] See also Figure 1-Figure 5 The camera module of the present invention includes a base 106 and a mobile carrier 101, wherein the mobile carrier 101 is used to drive the lens assembly 102 along the optical axis direction ( Figure 1 The focus can be achieved by moving up and down (in the Z direction).

[0032] The camera module of the present invention further includes a magnetic component 103 and a multi-coil assembly 107 that are arranged relatively to each other. Here, a moving 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 is used as an example for description. Those skilled in the art can understand that in other embodiments not shown, a moving coil structure arranged oppositely can also be adopted, that is, the multi-coil assembly 107 is arranged on the mobile carrier 101, and the magnetic component 103 is arranged on the base 106. In short, as long as one of the magnetic component 103 and the multi-coil assembly 107 is arranged on the mobile carrier 101, and the other of the magnetic component 103 and the multi-coil assembly 107 is arranged on the base 106, it can be used to achieve the purpose of the present invention.

[0033] The magnetic component 103 on the mobile carrier 101 includes magnets 104 uniformly distributed around the mobile carrier 101, which are shown here as a single magnet 104 uniformly distributed on the four sides of the mobile carrier 101. Those skilled in the art can understand that, according to needs, the magnet 104 can also be implemented in the form of a magnet group, or can 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 yoke 105 arranged corresponding to the magnet 104 and embedded in the mobile carrier 101, so as to make the magnetic field more uniform.

[0034] The multi-coil assembly 107 on the base 106 is arranged around the mobile carrier 101, including a first sub-coil assembly 107A located inside the magnet 104, a second sub-coil assembly 107B located below the outside of the magnet 104, and a third sub-coil assembly 107C located above the outside of the magnet 104. The second sub-coil assembly 107B and the third sub-coil assembly 107C are stacked up and down. Due to the use of the multi-coil assembly, a smaller resistance and a larger driving force can be achieved compared to a single coil assembly with the same number of turns.

[0035] The control method of the camera module of the present invention includes: when the mobile carrier 101 is located at the initial position, providing a driving current to at least part of the sub-coil groups in the multi-coil assembly 107 to drive the mobile carrier 101 away from the initial position; after the mobile carrier 101 leaves the initial position, by adjusting the driving current size, direction or on-off of at least part of the sub-coil groups, the mobile carrier 101 reaches an optimal motion state, so that in application situations with different requirements, different driving forces can drive the mobile carrier to drive the lens assembly to move up and down along the optical axis direction for focusing, thereby realizing a large-stroke motor that can meet different performance requirements.

[0036] For the moving magnetic structure in which the magnetic component 103 is disposed on the moving carrier 101 and the multi-coil assembly 107 is disposed on the base 106, when the moving carrier 101 is located at the initial position, the magnet 104 on the moving carrier 101 is located at the bottom of the base, closer to the sub-coil groups 107A and 107B located below (see Figure 7 ); During the upward movement of the mobile carrier 101 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 Figure 8-Figure 10 ).

[0037] 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, 107C located at the bottom in the multi-coil assembly 107 to provide a larger driving force to 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, 107B located at the bottom.

[0038] Further preferably, in the process of the mobile carrier 101 moving upward away from the initial position, the driving force can be increased and the focusing speed can be improved by turning on or increasing the driving current of at least a part of the sub-coil group 107C located above.

[0039] Further preferably, in the process of the mobile carrier 101 moving upward away from the initial position, the driving force can be increased and the focusing speed can be improved by changing the driving current direction of at least part of the sub-coil groups.

[0040] Further preferably, during the process of the mobile carrier 101 moving 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.

[0041] The control method of the camera module of the present invention is described in detail below in conjunction with specific embodiments: Embodiment 1: When the mobile carrier 101 is located at the initial position, a driving current is provided to all sub-coil groups 107A, 107B, and 107C in the multi-coil assembly 107, so as to drive the mobile carrier 101 to get rid of the static inertia or the force locking the mobile carrier 101 at the initial position with a large driving force, thereby driving the mobile carrier 101 to get rid of the initial position as soon as possible and move upward along the optical axis Z direction; 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.

[0042] Embodiment 2: When the mobile carrier 101 is at the initial position, a driving current is provided to the first sub-coil group 107A and the second sub-coil group 107B located below, so as to drive the mobile carrier 101 to get rid of the static inertia or the force locking the mobile carrier 101 at the initial position with a larger driving force, thereby driving the mobile carrier 101 to get rid of the initial position as soon as possible and move upward along the optical axis Z direction; After the mobile carrier 101 leaves the initial position, the driving current is stopped from being provided to the first sub-coil group 107A and the second sub-coil group 107B located below, and the driving current is started to be provided 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.

[0043] Example 3: See Figure 7, when the mobile carrier 101 is located at 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, wherein the driving current of the first sub-coil group 107A and the second sub-coil group 107B is a forward current, and the driving current of the third sub-coil group 107C is a reverse current, so as to drive the mobile carrier 101 to get rid of the static inertia or the force that locks the mobile carrier 101 in the initial position with a larger driving force, thereby driving the mobile carrier 101 to get rid of the initial position as soon as possible and move upward along the optical axis Z direction; When the mobile carrier 101 gradually moves away from the initial position and moves upward to a position such as Figure 8 When the magnet 104 is in the position shown, 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 changing 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. When the mobile carrier 101 continues to move upward away from the initial position to Fig. 9 When the magnet 104 is in the position shown, 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 and the focusing speed can be improved. When the mobile carrier 101 continues to move upward away from the initial position to Fig.10 When the magnet 104 is in the position shown, the magnet 104 has completely passed the first sub-coil group 107A and the second sub-coil group 107B, and the driving power consumption can be saved by turning off the driving current of the first sub-coil group 107A and the second sub-coil group 107B. During the downward movement of the mobile carrier 101 close to the initial position, as shown in FIG. Fig.11 As shown, 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.

[0044] 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 gentle up and down movement of the mobile carrier.

[0045] 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 by reasonably adjusting the driving current size, direction or on-off of each sub-coil group, the mobile carrier can achieve the optimal motion state. The details will not be repeated here.

[0046] Those skilled in the art can understand that the above-mentioned arrangement of the first sub-coil group 107A, the second sub-coil group 107B, and the third sub-coil group 107C is only a preferred embodiment of the present invention, and is not a limitation of the present invention. Those skilled in the art can reasonably set the number and position of the sub-coil groups in the multi-coil assembly 107 according to the actual requirements of the size, space, driving capability, etc. of the camera module. As long as the multi-coil assembly 107 includes at least two sub-coil groups stacked up and down, it can be used to implement the present invention. For example, two sub-coil groups stacked up and down can be set on the inner side of the magnet 104, or sub-coil groups stacked up and down, or even overlapping left and right or inside and outside can be set on the outer side of the magnet 104. Three sub-coil groups can also be set, or two sub-coil groups stacked up and down can be set on both sides of the magnet 104, etc. Each sub-coil group can include coils of various numbers and arrangements, which are not listed here one by one, and should all be included in the protection scope of the present invention.

[0047] The control method of the camera module of the present invention is not limited to the above-mentioned embodiments. A person skilled in the art may provide a driving current to at least part of the sub-coil groups in the multi-coil assembly 107 based on the specific settings of the sub-coil groups in the multi-coil assembly when the mobile carrier 101 is in the initial position, so as 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 so that the mobile carrier 101 reaches the optimal motion state. In this way, in application situations with different requirements, different driving forces can drive the mobile carrier to drive the lens assembly to move up and down along the optical axis direction for focusing, thereby realizing a large-stroke motor that can meet different performance requirements.

[0048] See also Figure 1 , Figure 6The camera module of the present invention may further include a locking component 108, which is shown here as a magnetic locking component 108. The magnetic locking component 108 is arranged on the base 106 at a position opposite to the magnet 104. It is shown here as two magnetic locking components 108, which are symmetrically arranged on both sides of the base 106, corresponding to the two magnets 104 respectively. Those skilled in the art may also adjust the number of magnetic locking components 108 as needed. For example, four magnetic locking components 108 are evenly distributed on the four sides of the base 106, corresponding to the four magnets 104 respectively. The locking is achieved by the attraction between the magnet 104 and the magnetic locking component 108, so that the mobile carrier 101 is locked in the initial position to prevent accidental throwing out. When the multi-coil component is provided with a driving current, after the mobile carrier 101 is separated from the initial position under the action of a large driving force, the attraction between the magnet 104 and the magnetic locking component 108 gradually decreases, and the lock is released.

[0049] 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.

[0050] See also Figure 3 , Figure 4 , the mobile carrier 101 is also provided with guide rails 111 uniformly distributed around the mobile carrier 101, and four guide rails 111 are shown here respectively located at the four corners of the mobile carrier 101, wherein the two guide rails 111 located on the same side form rolling contact with the base 106 through rollers 109, and the two guide rails 111 located on the other side form rolling contact with the base 106 through balls 110. Those skilled in the art can also adjust the number of guide rails 111 as needed, for example, two guide rails 111 are symmetrically distributed at the two corners of the mobile carrier 101, and the guide rails 111 and the base 106 can also form rolling contact or sliding contact through other rolling parts to stabilize the direction of movement of the mobile carrier 101 along the optical axis. Preferably, the guide rails 111 and the yoke 105 can be a common structure, integrally formed with magnetic conductive materials, and embedded in the mobile carrier 101 to reduce the difficulty of assembly.

[0051] In addition, a conductive wire buried layer (not shown) may 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 a 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.

[0052] Since the present embodiment preferably adopts a dynamic magnetic design, the movable 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, thereby reducing the overall assembly difficulty and improving the reliability of the overall structure.

[0053] 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.

[0054] In summary, the control method of the camera module of the present invention is provided with one of a magnetic component and a multi-coil assembly on a mobile carrier, and another 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 smaller resistance and greater driving force compared to a single coil assembly with the same number of turns, and when the mobile carrier is in the 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 is out of 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 the 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 direction 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.

[0055] It will be apparent to those skilled in the art that the 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, in any case, the embodiments should be considered exemplary and non-restrictive. Furthermore, it is apparent that the term "comprising" does not exclude other elements and steps, and the wording "a" does not exclude the plural. Multiple elements stated in a device claim may also be implemented by one element. The words first, second, etc. are used to indicate names and do not indicate 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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