A ball-type anti-shake motor and an electronic device

Abstract

The present invention relates to the field of imaging technology, and discloses a ball-type anti-shake motor and an electronic device. In the ball-type anti-shake motor of the present invention, a transmitting electrode plate is arranged on a circuit board, a first floating electrode plate is arranged on a first mover, and a second floating electrode plate opposite to the first floating electrode plate is arranged on a second mover; a first receiving electrode plate is further arranged on the circuit board, and the first receiving electrode plate is arranged opposite to the first floating electrode plate; a first capacitor is formed between the first receiving electrode plate and the first floating electrode plate, a second capacitor is formed between the first floating electrode plate and the second floating electrode plate, a third capacitor is formed between the second floating electrode plate and the housing opposite to each other, and a fourth capacitor is formed between the transmitting electrode plate and the first floating electrode plate; a capacitive detection unit in the form of a combination of series capacitors and parallel capacitors is constructed by the above-mentioned several capacitors, and the detection result of the capacitive detection unit is changed by the change in the magnitude of the capacitance value in parallel, thereby improving the sensitivity of position detection.

Description

Technical Field

[0001] The present invention relates to the field of camera technology, and particularly to a ball-type anti-shake motor and an electronic device. Background Art

[0002] The ball-type anti-shake motor drives the ball to roll in the rolling groove provided on the mover through electromagnetic force, and then drives the mover to move, so as to offset in real time the displacement deviation caused by external vibration, thereby achieving focusing and optical anti-shake. Since the ball-type anti-shake motor needs to have displacements in at least the focusing direction and the shaking direction, usually the first mover and the second mover are nestedly designed to achieve movements in more than two directions.

[0003] Since the circuit board of the ball-type anti-shake motor is usually designed on the periphery of the overall structure, it is difficult for the second mover, which is relatively internal in the nested structure, to directly form an electrical connection with the circuit board. This leads to the ball-type anti-shake motor usually adopting a magnetic-field type displacement detection unit to determine the movement of the second mover, or through the transmission effect of an electric field by multiple floating plates that do not require electrical connection, so as to avoid directly arranging components related to displacement detection that require electrical connection on the second mover.

[0004] However, the current displacement detection methods of the ball-type anti-shake motor have at least the following disadvantages: being easily affected by magnetic field changes in the environment through the magnetic-field type displacement detection unit, resulting in inaccurate detection results. Through the transmission effect of an electric field by multiple floating plates, the capacitance value of the formed capacitance structure will be reduced while the electric field is transmitted by the floating plates, thereby affecting the detection accuracy and sensitivity. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a ball-type anti-shake motor and an electronic device, to construct a capacitive detection unit combining series capacitors and parallel capacitors, and change the detection result of the capacitive detection unit by the change in the magnitude of the parallel capacitance value, avoiding the reduction effect on the capacitance value in the multi-layer series floating plate structure, and improving the sensitivity of position detection.

[0006] To solve the above technical problems, an embodiment of the present invention provides a ball-type anti-shake motor, comprising: a first mover, a second mover, a first ball, a second ball, a circuit board, a base and a housing; the first mover makes a relative displacement with the base in the focusing direction by means of the first ball; the second mover makes a relative displacement with the base in the shaking direction by means of the second ball; wherein, the shaking direction is perpendicular to the focusing direction; a transmitting electrode plate is arranged on the circuit board, a first floating electrode plate is arranged on the first mover, and a second floating electrode plate opposite to the first floating electrode plate is arranged on the second mover; a first receiving electrode plate is further arranged on the circuit board, and the first receiving electrode plate is arranged opposite to the first floating electrode plate; a first capacitor is formed between the first receiving electrode plate and the first floating electrode plate, a second capacitor is formed between the first floating electrode plate and the second floating electrode plate, a third capacitor is formed between the second floating electrode plate and the housing in a relative setting, and a fourth capacitor is formed between the transmitting electrode plate and the first floating electrode plate; when the second mover moves in the shaking direction, the distance or the facing area between the first floating electrode plate and the second floating electrode plate changes, and the overall capacitance formed by the series connection of the second capacitor and the third capacitor and then in parallel with the first capacitor is in series with the fourth capacitor to form a shaking direction detection capacitor, and the moving distance of the second mover in the shaking direction is determined according to the change condition of the shaking direction detection capacitor.

[0007] An embodiment of the present invention further provides an electronic device, comprising the above-mentioned ball-type anti-shake motor.

[0008] Compared with the related art, in the embodiment of the present invention, while the transmitting electrode plate and the receiving electrode plate arranged on the circuit board and the first floating electrode plate arranged on the first mover form a detection capacitor, a second floating electrode plate opposite to the first floating electrode plate is arranged on the second mover, and the second capacitor formed between the second floating electrode plate and the first floating electrode plate is in parallel with the capacitors formed by the transmitting electrode plate and the receiving electrode plate with the help of the first floating electrode plate, and the change of the capacitance value of the parallel second capacitor is used to affect the capacitance signal received by the receiving electrode plate. Since the capacitance value of the second capacitor changes due to the moving distance of the second mover, the change of the capacitance signal received by the receiving electrode plate can reflect the moving distance of the second mover. By constructing the above capacitance detection unit in the way of parallel capacitors, the reduction of the capacitance value of the capacitance structure caused by the series connection of multiple floating electrode plates can be reduced, and the detection sensitivity is improved.

[0009] In addition, the first floating plate electrode includes a side plate electrode disposed on the side of the first mover, a bottom plate electrode disposed on the bottom of the first mover, and an extension plate electrode spaced apart from the side plate electrode; wherein, the side plate electrode is disposed opposite to the emitting plate electrode, and the side plate electrode, the bottom plate electrode, and the extension plate electrode carry the same amount of charge; the first capacitor is composed of the first receiving plate electrode and the extension plate electrode, the second capacitor is composed of the bottom plate electrode and the second floating plate electrode, and the fourth capacitor is composed of the emitting plate electrode and the side plate electrode.

[0010] In addition, the jitter directions include: the X-axis direction and the Y-axis direction, wherein both the X-axis direction and the Y-axis direction are parallel to the bottom surface of the base, and the X-axis direction and the Y-axis direction are respectively perpendicular to the adjacent surfaces of the base; the emitting plate electrode includes: an X-axis emitting plate electrode and a Y-axis emitting plate electrode; the side plate electrode includes: an X-axis side plate electrode and a Y-axis side plate electrode; the bottom plate electrode includes: an X-axis bottom plate electrode and a Y-axis bottom plate electrode, the extension plate electrode includes: an X-axis extension plate electrode and a Y-axis extension plate electrode; the second floating plate electrode includes: a second X-axis floating plate electrode and a second Y-axis floating plate electrode; the first receiving plate electrode includes: an X-axis receiving plate electrode and a Y-axis receiving plate electrode; the X-axis emitting plate electrode, the X-axis side plate electrode, the X-axis bottom plate electrode, the X-axis extension plate electrode, the second X-axis floating plate electrode, and the X-axis receiving plate electrode constitute an X-axis direction detection unit; the Y-axis emitting plate electrode, the Y-axis side plate electrode, the Y-axis bottom plate electrode, the Y-axis extension plate electrode, the second Y-axis floating plate electrode, and the Y-axis receiving plate electrode constitute a Y-axis direction detection unit.

[0011] In addition, when the second mover moves in the X-axis direction, the facing area between the second X-axis floating plate electrode and the X-axis bottom plate electrode changes, and the facing area between the second Y-axis floating plate electrode and the Y-axis bottom plate electrode does not change; when the second mover moves in the Y-axis direction, the facing area between the second Y-axis floating plate electrode and the Y-axis bottom plate electrode changes, and the facing area between the second X-axis floating plate electrode and the X-axis bottom plate electrode does not change.

[0012] In addition, the facing area between the first receiving plate electrode and the extension plate electrode remains unchanged all the time.

[0013] In addition, the facing area between the emitting plate electrode and the side plate electrode remains unchanged all the time.

[0014] In addition, the plane where the X-axis receiving plate electrode is located and the plane where the Y-axis receiving plate electrode is located are the same plane.

[0015] In addition, the second X-axis floating plate electrode and the second Y-axis floating plate electrode are electrically connected through a conductor.

[0016] In addition, the ball-type anti-shake motor further includes: a second receiving electrode plate disposed on the circuit board, the number of the second receiving electrode plates being two, and the two second receiving electrode plates being arranged in sequence in the focusing direction. The first floating electrode plate includes: a Z-axis floating electrode plate, and the two second receiving electrode plates are both disposed opposite to the Z-axis floating electrode plate. When the first mover moves in the focusing direction, a first change amount of the facing area between the Z-axis floating electrode plate and one of the second receiving electrode plates is equal to a second change amount of the facing area between the Z-axis floating electrode plate and the other second receiving electrode plate. Description of the Drawings

[0017] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements. Unless otherwise stated, the drawings in the figures do not constitute a proportional limitation.

[0018] Figure 1 is an exploded structural schematic diagram of the ball-type anti-shake motor in the embodiment of the present solution;

[0019] Figure 2 is a schematic diagram of the principle of the jitter direction displacement detection structure in the ball-type anti-shake motor in the embodiment of the present solution;

[0020] Figure 3 is a schematic diagram of relevant parameters of the jitter direction displacement detection structure in the ball-type anti-shake motor in the embodiment of the present solution;

[0021] Figure 4 is a schematic diagram of the corresponding relationship between the C2 capacitance value and the jitter direction detection capacitor C in the ball-type anti-shake motor in the embodiment of the present solution;

[0022] Figure 5 is a three-dimensional structural schematic diagram of the ball-type anti-shake motor in the embodiment of the present solution;

[0023] Figure 6 is a top-view structural schematic diagram of the ball-type anti-shake motor in the embodiment of the present solution;

[0024] Figure 7 is a schematic diagram of relevant parameters of the second floating electrode plate and the bottom electrode plate in the ball-type anti-shake motor in the embodiment of the present solution;

[0025] Figure 8 is a schematic diagram of relevant parameters of the transmitting electrode plate and the side electrode plate in the ball-type anti-shake motor in the embodiment of the present solution.

[0026] Description of the Reference Numerals:

[0027] 1 - Circuit board;

[0028] 2 - Base;

[0029] 31 - First mover; 32 - Second mover;

[0030] 41 - First ball; 42 - Second ball;

[0031] 51 - Transmitting electrode plate; 52 - Side electrode plate; 53 - Bottom electrode plate; 54 - Extension electrode plate; 55 - Second floating electrode plate; 56 - First receiving electrode plate; 57 - Z - axis floating electrode plate; 511 - X - axis transmitting electrode plate; 512 - Y - axis transmitting electrode plate; 521 - X - axis side electrode plate; 522 - Y - axis side electrode plate; 531 - X - axis bottom electrode plate; 532 - Y - axis bottom electrode plate; 541 - X - axis extension electrode plate; 542 - Y - axis extension electrode plate; 551 - Second X - axis floating electrode plate; 552 - Second Y - axis floating electrode plate; 561 - X - axis receiving electrode plate; 562 - Y - axis receiving electrode plate;

[0032] 60 - Second receiving electrode plate;

[0033] 7 - Housing. Detailed implementation mode

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be elaborated in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present invention, many technical details are presented to help readers better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed by the present invention can still be implemented.

[0035] The following division of each embodiment is for convenience of description and should not constitute any limitation to the specific implementation mode of the present invention. Each embodiment can be combined and cross - referenced with each other on the premise of no contradiction.

[0036] The embodiments of the present invention relate to a ball - type anti - shake motor, as Figure 1 shown, the ball - type anti - shake motor includes: circuit board 1, base 2, first mover 31, second mover 32, first ball 41, second ball 42, and housing 7; the first mover 31 makes a relative displacement with the base 2 in the focusing direction by using the first ball 41; the second mover 32 makes a relative displacement with the base 2 in the shaking direction by using the second ball 42; wherein, the shaking direction is perpendicular to the focusing direction.

[0037] The detection unit structure for detecting the displacement in the shaking direction is as Figure 2 shown, a transmitting electrode plate 51 is provided on the circuit board 1, and a first floating electrode plate is provided on the first mover 31 (as Figure 2(a combination of the side plate 52, the bottom plate 53, and the extension plate 54 shown), the second mover 32 is provided with a second floating plate 55 opposite to the first floating plate; a first receiving plate 56 is further provided on the circuit board 1, and the first receiving plate 56 is disposed opposite to the first floating plate; a first capacitance is formed between the first receiving plate 56 and the first floating plate, a second capacitance is formed between the first floating plate and the second floating plate 55, a third capacitance is formed between the second floating plate 55 and the housing 7, and a fourth capacitance is formed between the transmitting plate 51 and the first floating plate; when the second mover 32 moves in the jitter direction, the distance or the facing area between the first floating plate and the second floating plate 55 changes, and the overall capacitance formed by the series connection of the second capacitance and the third capacitance in parallel with the first capacitance is then connected in series with the fourth capacitance to form a jitter direction detection capacitance, and the moving distance of the second mover 32 in the jitter direction is determined according to the change of the jitter direction detection capacitance.

[0038] Compared with the related art, in the embodiment of the present invention, while the transmitting plate and the receiving plate provided on the circuit board and the first floating plate provided on the first mover form a detection capacitance, a second floating plate opposite to the first floating plate is provided on the second mover, and the second capacitance formed by the second floating plate and the first floating plate is connected in parallel with the capacitance formed by the transmitting plate and the receiving plate with the help of the first floating plate, and the change of the capacitance value of the parallel-connected second capacitance affects the capacitance signal received by the receiving plate. Since the capacitance value of the second capacitance changes due to the moving distance of the second mover, therefore, the change of the capacitance signal received by the receiving plate can reflect the moving distance of the second mover. By constructing the above capacitive detection unit in the way of parallel capacitance, the reduction of the capacitance value of the capacitance structure caused by the series connection of multiple floating plates can be reduced, and the detection sensitivity is improved.

[0039] As Figure 2 shown, it is a schematic diagram of the jitter direction displacement detection unit formed. Among them, the transmitting plate 51 is connected to the Tx transmitting signal terminal of the chip IC, the first receiving plate 56 is connected to the Rx receiving signal terminal of the chip IC, and the first floating plate includes a side plate 52 provided on the side of the first mover 31, a bottom plate 53 provided on the bottom surface of the first mover, and an extension plate 54 spaced from the side plate 52; among them, the side plate 52 is disposed opposite to the transmitting plate 51, and the side plate 52, the bottom plate 53, and the extension plate 54 carry the same amount of charge.

[0040] As Figure 3As shown, the first capacitor C1 is composed of a first receiving plate 56 and an extending plate 54, the second capacitor C2 is composed of a bottom plate 53 and a second floating plate 55, the third capacitor C3 is composed of the second floating plate 55 and a housing 7, and the fourth capacitor C4 is composed of a transmitting plate 51 and a side plate 52. The overall capacitance formed by connecting the second capacitor C2 and the third capacitor C3 in series and then in parallel with the first capacitor C1 is then connected in series with the fourth capacitor C4 to form a jitter direction detection capacitor C. Among them, the series capacitance C23 of the second capacitor C2 and the third capacitor C3 is (C2 x C3) / (C2 + C3); the capacitance C231 obtained by connecting C23 and C1 in parallel is C231 = C23 + C1; which is connected in series with C4 to form a jitter direction detection capacitor C,

[0041] ;

[0042] Assume that the voltage at the Tx transmitting signal terminal is Va, the voltages of the side plate 52, the bottom plate 53, and the extending plate 54 are all Vb, the voltage of the second floating plate 55 is Vd, and the voltage at the Rx receiving signal terminal is Vc. Since the Rx receiving signal terminal is a high-impedance terminal, Vc can be equivalently considered as grounded. The current I at the Tx transmitting signal terminal is obtained 总 ;

[0043] ;

[0044] where j is the imaginary unit, and ω is the angular frequency. At the same time, the current I at the Rx receiving signal terminal can be obtained C ;

[0045] .

[0046] It can be seen that the capacitance change of the parallel-connected C2 can affect the capacitance value of the jitter direction detection capacitor C, and further affect the current values at the Tx transmitting signal terminal and the Rx receiving signal terminal.

[0047] Taking the example that as the second mover moves, the facing area between the first floating plate and the second floating plate changes, the influence of C2 on the capacitance value of C will be specifically described as follows:

[0048] As Figure 3As shown, when the second mover 32 moves in the jitter direction, the position of the first mover 31 does not change. Therefore, the capacitance values of C1 and C4 do not change. Also, since C3 is the self-capacitance between the second floating plate 55 and the ground (usually relatively large), the capacitance value of C3 is hardly affected as the second mover 32 moves. The second floating plate 55 provided on the second mover moves accordingly, and the facing area between it and the first floating plate (specifically the bottom plate 53) on the first mover changes, thereby affecting the capacitance value of C2. The jitter direction detection capacitor C changes due to the change in the capacitance value of C2.

[0049] Assume that C1 and C4 are fixed capacitors of 200 fF, and C3 is the capacitance between the second floating plate and the ground of 500 fF (self-capacitance is relatively large). The simulation results of the relationship between the capacitance value of the jitter direction detection capacitor C and the change in the capacitance value of C2 are obtained as Figure 4 shown. It can be seen from the figure that the size of C changes with the change of C2, and the two have a positive correlation linear change relationship. Therefore, by only changing the capacitance value of C2, the capacitance of the jitter direction detection capacitor C can be changed, thereby achieving the purpose of using the jitter direction detection capacitor to determine the movement of the second mover.

[0050] In addition, as Figures 5 to 6 shown, it is a schematic structural diagram of a ball-type anti-shake motor in different dimensions. It can be seen from the figure that the jitter direction includes the X-axis direction and the Y-axis direction. The X-axis direction and the Y-axis direction are both parallel to the bottom surface of the base 2, and the X-axis direction and the Y-axis direction are respectively perpendicular to the adjacent surfaces of the base 2; the transmitting plate 51 includes: the X-axis transmitting plate 511 and the Y-axis transmitting plate 512; the side plates 52 include: the X-axis side plates 521 and the Y-axis side plates 522; the bottom plate 53 includes: the X-axis bottom plate 531 and the Y-axis bottom plate 532, the extending plate 54 includes: the X-axis extending plate 541 and the Y-axis extending plate 542; the second floating plate 55 includes: the second X-axis floating plate 551 and the second Y-axis floating plate 552; the first receiving plate 56 includes: the X-axis receiving plate 561 and the Y-axis receiving plate 562; the X-axis transmitting plate 511, the X-axis side plate 521, the X-axis bottom plate 531, the X-axis extending plate 541, the second X-axis floating plate 551 and the X-axis receiving plate 561 constitute the X-axis direction detection unit; the Y-axis transmitting plate 512, the Y-axis side plate 522, the Y-axis bottom plate 532, the Y-axis extending plate 542, the second Y-axis floating plate 552 and the Y-axis receiving plate 562 constitute the Y-axis direction detection unit.

[0051] When the second mover 32 moves in the X-axis direction, the facing area between the second X-axis floating plate 551 and the X-axis bottom plate 531 changes, and the facing area between the second Y-axis floating plate 552 and the Y-axis bottom plate 532 remains unchanged, so as to avoid the distance of movement in the X direction affecting the detection result of the Y-axis direction detection unit. Similarly, when the second mover 32 moves in the Y-axis direction, the facing area between the second Y-axis floating plate 552 and the Y-axis bottom plate 532 changes, and the facing area between the second X-axis floating plate 551 and the X-axis bottom plate 531 remains unchanged, so as to avoid the distance of movement in the Y direction affecting the detection result of the X-axis direction detection unit.

[0052] In order to achieve the effect that the detection results in the X-axis direction and the Y-axis direction do not interfere with each other, the relevant parameters of the second X-axis floating plate 551 and the X-axis bottom plate 531, and the second Y-axis floating plate 552 and the Y-axis bottom plate 532 are set as Figure 7 shown. Assuming that under the initial position of the ball-type anti-shake motor (the displacements in the X-axis, Y-axis, and Z-axis directions are all 0), the distance between the left edge of the second X-axis floating plate 551 and the left edge of the X-axis bottom plate 531 is a, and the distance between the right edge of the second X-axis floating plate 551 and the right edge of the X-axis bottom plate 531 is b. Among them, a is greater than the stroke of the second mover moving to the left under the initial position, and b is greater than the stroke of the second mover moving to the right under the initial position. Figure 7 The left and right directions shown are the Y-axis direction. In addition, the distance between the lower edge of the second Y-axis floating plate 552 and the lower edge of the Y-axis bottom plate 532 is c, and the distance between the upper edge of the second Y-axis floating plate 552 and the upper edge of the Y-axis bottom plate 532 is d. c is greater than the stroke of the second mover moving downward under the initial position, and d is greater than the stroke of the second mover moving upward under the initial position. Figure 7 The up and down directions shown are the X-axis direction.

[0053] In addition, whether the first mover 31 moves in the focusing direction or the second mover 32 moves in the jitter direction, the facing area between the first receiving plate 56 and the extension plate 54 always remains unchanged. The facing area between the transmitting plate 51 and the side plate 52 always remains unchanged. Taking the relative position of the transmitting plate 51 and the side plate 52 as an example, as Figure 8As shown, the orthographic projection of the side plate 52 towards the emission plate 51 completely falls within the emission plate 51. The distance between the upper edge of the side plate 52 and the upper edge of the emission plate 51 is e, and the distance between the lower edge of the side plate 52 and the lower edge of the emission plate 51 is also e. e needs to be greater than the stroke of the first mover moving upward or downward in the focusing direction (Z-axis direction). In addition, the length L1 of the side plate 52 in the left-right direction is less than the length L2 of the emission plate 51 in the left-right direction, ensuring that during the slight jitter that occurs during the sliding of the first mover on the first ball, and thus in the case of a small displacement in the non-focusing direction, the facing area size between the side plate 52 and the emission plate 51 will not be affected. Minimize the impact of the change in the facing area between the side plate 52 and the emission plate 51 on the capacitances C4 and C1.

[0054] Similarly, in order to ensure that the facing area between the first receiving plate 56 and the extending plate 54 remains constant all the time, the way of setting the positional relationship between the first receiving plate 56 and the extending plate 54 is the same as the way of setting between the side plate 52 and the emission plate 51.

[0055] In addition, in order to reduce the occupation of different sides of the circuit board, the X-axis receiving plate and the Y-axis receiving plate can be arranged on the same side of the circuit board, that is, the plane where the X-axis receiving plate is located and the plane where the Y-axis receiving plate is located are the same plane.

[0056] In addition, the second X-axis floating plate and the second Y-axis floating plate are electrically connected through a conductor. As Figure 5 shown, in order to fit the shape of the lens of the ball-type anti-shake motor, a carrier bracket in a circular ring shape can be arranged around the lens. The carrier bracket has conductivity, and the second X-axis floating plate 551 and the second Y-axis floating plate 552 are respectively connected to the carrier bracket by wires to achieve their electrical connection.

[0057] In addition, as Figure 5As shown, the ball-type anti-shake motor further includes: a second receiving electrode plate 60 disposed on the circuit board. The number of the second receiving electrode plates 60 is two, and the two second receiving electrode plates 60 are arranged in sequence in the focusing direction. The first floating electrode plate includes: a Z-axis floating electrode plate 57, and both of the two second receiving electrode plates 60 are disposed opposite to the Z-axis floating electrode plate 57. The Z-axis floating electrode plate 57 disposed opposite to the second receiving electrode plate 60 can be a plate connected to the side electrode plate 52 through a wire, or a plate of the same material extending from the side electrode plate. When the first mover moves in the focusing direction, the first change amount of the facing area between the Z-axis floating electrode plate 57 and one of the second receiving electrode plates 60 is equal to the second change amount of the facing area between the Z-axis floating electrode plate 57 and the other second receiving electrode plate 60. So as to perform differential calculation on the capacitance formed by the Z-axis floating electrode plate 57 and one of the second receiving electrode plates 60 and the capacitance formed by the Z-axis floating electrode plate 57 and the other second receiving electrode plate 60, and perform processing such as correction or denoising on the capacitance signal, etc., to eliminate the noise that affects the accuracy of the calculation result caused by environmental factors, human operation factors, or movement in the shaking direction, etc., and at the same time improve the sensitivity of the control of the movement of the lens position.

[0058] In addition, the ball-type anti-shake motor includes a driving unit, which includes a first driving magnet disposed on the first mover and a first driving coil disposed on the base. The first driving magnet and the first driving coil are disposed opposite to each other and are used to drive the first mover to move in the focusing direction. The first driving magnet forms a fixed magnetic field. The first driving coil is connected to the circuit board and is powered and controlled through an external circuit and an IC. After the first driving coil is powered on, an induced magnetic field is generated, and the interaction between the induced magnetic field and the fixed magnetic field formed by the first driving magnet generates a Lorentz force. Since the first driving coil is fixed on the base 2 and cannot move, the Lorentz force is feedback to the first driving magnet. Due to the existence of the first ball 41, the carrier of the first driving magnet, the first mover 31, can move relative to the base 2, thereby realizing the driving of the first mover 31. By changing the current in the first driving coil, the magnitude of the Lorentz force can be controlled, and by changing the force received by the first mover 31, the moving distance can be controlled.

[0059] Similarly, regarding the driving of the second mover, the driving unit includes a second driving magnet disposed on the second mover and a second driving coil disposed on the base. The second driving magnet and the second driving coil are disposed opposite to each other and are used to drive the second mover to move in the jitter direction. The driving principle is the same as that of the above-mentioned driving of the first mover. Among them, the second driving coil includes an X-axis driving coil and a Y-axis driving coil, and the corresponding second driving magnets include: an X-axis driving magnet and a Y-axis driving magnet. The X-axis driving coil and the X-axis driving magnet are disposed opposite to each other, and the Y-axis driving coil and the Y-axis driving magnet are disposed opposite to each other. The first driving magnet and the first driving coil, the X-axis driving coil and the X-axis driving magnet, and the Y-axis driving coil and the Y-axis driving magnet, the three driving units are respectively located on different side parts of the motor to avoid the mutual influence of the driving magnetic fields and affect the driving effect of the motor.

[0060] To ensure the driving effect of the driving unit, the driving unit is usually disposed at the middle area position on the side part of the motor. As mentioned above, the capacitive detection unit is also disposed on the side part of the motor. To ensure the driving effect of the motor, an avoidance can be made in the setting position of the capacitive detection unit, that is, the capacitive detection unit disposed on the same side part of the motor as the driving unit is disposed in the two side areas of the side part of the motor, and the middle area position is used as the setting position of the driving unit.

[0061] To reduce the volume of the ball-type anti-shake motor, each component inside the ball-type anti-shake motor can be nested in the focusing direction. For example, the second mover 32 is disposed inside the first mover 31, that is, the first mover 31 is a hollow frame structure, and the middle area is used to accommodate the lens. The frame surrounds the outside of the second mover 32. Such a structure enables the second mover 32 to at least partially overlap with the first mover 31 in the focusing direction, and can reduce the thickness of the ball-type anti-shake motor in the focusing direction. Similarly, the base 2 at least partially overlaps with the first mover 31 in the focusing direction, and can also reduce the thickness of the ball-type anti-shake motor in the focusing direction. The circuit board 1 is disposed on the side wall of the base 2, which is convenient for the electrical connection between the first detection unit and the second detection unit disposed inside the ball-type anti-shake motor. The circuit board 1 can be a flexible printed circuit board FPC, which is more convenient for being attached to the outer surface of the base. The movement of the first mover in the focusing direction can drive the second mover to move in the focusing direction accordingly, but the second mover itself can only move in the jitter direction, and the movement of the second mover in the jitter direction will not drive the first mover to move accordingly.

[0062] Another feasible embodiment of the present invention relates to an electronic device, including the ball-type anti-shake motor as described above. The ball-type anti-shake motor is used in cooperation with the lens to realize the acquisition of images and automatically calibrate the vibration of the external environment, and improve the quality of image acquisition.

[0063] Compared with the related art, the electronic device provided in the embodiment of the present invention is provided with the ball-type anti-shake motor provided in the foregoing embodiment. Therefore, it also has the technical effects provided in the foregoing embodiment, which will not be elaborated herein.

[0064] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present invention. In actual applications, various changes can be made to them in form and details without departing from the spirit and scope of the present invention.

Claims

1. A ball-type anti-shake motor, characterized in that Comprising: A first mover, a second mover, a first ball, a second ball, a circuit board, a base, and a housing; The first mover makes a relative displacement with the base in the focusing direction by means of the first ball; The second mover makes a relative displacement with the base in the jitter direction by means of the second ball; wherein, the jitter direction is perpendicular to the focusing direction; An emitting electrode plate is provided on the circuit board, a first floating electrode plate is provided on the first mover, and a second floating electrode plate opposite to the first floating electrode plate is provided on the second mover; A first receiving electrode plate is further provided on the circuit board, and the first receiving electrode plate is disposed opposite to the first floating electrode plate; The first receiving electrode plate and the first floating electrode plate form a first capacitor, the first floating electrode plate and the second floating electrode plate form a second capacitor, the second floating electrode plate and the housing are disposed opposite to form a third capacitor, and the emitting electrode plate and the first floating electrode plate form a fourth capacitor; When the second mover moves in the jitter direction, the distance or the facing area between the first floating electrode plate and the second floating electrode plate changes, and the overall capacitance formed by the series connection of the second capacitor and the third capacitor and then in parallel with the first capacitor is in series with the fourth capacitor to form a jitter direction detection capacitor, and the moving distance of the second mover in the jitter direction is determined according to the change of the jitter direction detection capacitor.

2. The ball-type anti-shake motor according to claim 1, wherein The first floating electrode plate includes a side electrode plate provided on the side of the first mover, a bottom electrode plate provided on the bottom of the first mover, and an extension electrode plate spaced from the side electrode plate; wherein, the side electrode plate is disposed opposite to the emitting electrode plate, and the side electrode plate, the bottom electrode plate, and the extension electrode plate carry the same amount of charge; The first capacitor is composed of the first receiving electrode plate and the extension electrode plate, the second capacitor is composed of the bottom electrode plate and the second floating electrode plate, and the fourth capacitor is composed of the emitting electrode plate and the side electrode plate.

3. The ball-type anti-shake motor according to claim 2, wherein The jitter direction includes: the X-axis direction and the Y-axis direction, wherein both the X-axis direction and the Y-axis direction are parallel to the bottom surface of the base, and the X-axis direction and the Y-axis direction are respectively perpendicular to the adjacent surfaces of the base; The emitting electrode plate includes: an X-axis emitting electrode plate and a Y-axis emitting electrode plate; The side electrode plate includes: an X-axis side electrode plate and a Y-axis side electrode plate; the bottom electrode plate includes: an X-axis bottom electrode plate and a Y-axis bottom electrode plate, and the extension electrode plate includes: an X-axis extension electrode plate and a Y-axis extension electrode plate; The second floating electrode plate includes: a second X-axis floating electrode plate and a second Y-axis floating electrode plate; The first receiving electrode plate includes: an X-axis receiving electrode plate and a Y-axis receiving electrode plate; The X-axis emission electrode plate, the X-axis side electrode plate, the X-axis bottom electrode plate, the X-axis extension electrode plate, the second X-axis floating electrode plate, and the X-axis receiving electrode plate constitute an X-axis direction detection unit; the Y-axis emission electrode plate, the Y-axis side electrode plate, the Y-axis bottom electrode plate, the Y-axis extension electrode plate, the second Y-axis floating electrode plate, and the Y-axis receiving electrode plate constitute a Y-axis direction detection unit.

4. The ball-type anti-shake motor according to claim 3, wherein when the second mover moves in the X-axis direction, the facing area between the second X-axis floating electrode plate and the X-axis bottom electrode plate changes, and the facing area between the second Y-axis floating electrode plate and the Y-axis bottom electrode plate does not change; when the second mover moves in the Y-axis direction, the facing area between the second Y-axis floating electrode plate and the Y-axis bottom electrode plate changes, and the facing area between the second X-axis floating electrode plate and the X-axis bottom electrode plate does not change.

5. The ball-type anti-shake motor according to claim 2, wherein The facing area between the first receiving electrode plate and the extension electrode plate remains constant all the time.

6. The ball-type anti-shake motor according to claim 2, wherein The facing area between the emission electrode plate and the side electrode plate remains constant all the time.

7. The ball-type anti-shake motor according to claim 3, characterized in that, The plane where the X-axis receiving electrode plate is located and the plane where the Y-axis receiving electrode plate is located are the same plane.

8. The ball-type anti-shake motor according to claim 3, characterized in that The second X-axis floating electrode plate and the second Y-axis floating electrode plate are electrically connected through a conductor.

9. The ball-type anti-shake motor according to claim 1, wherein, Further comprising: a second receiving electrode plate disposed on the circuit board, the number of the second receiving electrode plates being two, and the two second receiving electrode plates are arranged in sequence in the focusing direction, the first floating electrode plate includes: a Z-axis floating electrode plate, and both of the two second receiving electrode plates are disposed opposite to the Z-axis floating electrode plate; when the first mover moves in the focusing direction, a first change amount of the facing area between the Z-axis floating electrode plate and one of the second receiving electrode plates is equal to a second change amount of the facing area between the Z-axis floating electrode plate and the other second receiving electrode plate.

10. An electronic device, characterized in that, Comprising: the ball-type anti-shake motor according to any one of claims 1 to 9.

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