Ball type anti-shake motor and electronic equipment

Abstract

The invention relates to the technical field of camera shooting, and discloses a ball type anti-shake motor and electronic equipment. According to the ball type anti-shake motor, a circuit board is provided with an emitting polar plate, a first rotor is provided with a first floating polar plate, and a second rotor is provided with a second floating polar plate opposite to the first floating polar plate; a first receiving polar plate is further arranged on the circuit board, and the first receiving polar plate and the first floating polar plate are oppositely arranged; the first receiving polar plate and the first floating polar plate form a first capacitor, the first floating polar plate and the second floating polar plate form a second capacitor, the second floating polar plate and the shell are oppositely arranged to form a third capacitor, and the transmitting polar plate and the first floating polar plate form a fourth capacitor; a series capacitor and parallel capacitor combined capacitive detection unit is constructed by the plurality of capacitors, and the detection result of the capacitive detection unit is changed through the change of the parallel capacitance value, so that the sensitivity of position detection is improved.

Description

Technical Field

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

[0002] The ball-type anti-shake motor drives the ball to roll in the rolling groove set on the mover through electromagnetic force, which in turn drives the mover to move, offsetting the displacement deviation caused by external vibration in real time, thereby achieving focus and optical image stabilization. Since the ball-type anti-shake motor needs to have displacement in at least the focus direction and the shake direction, the first mover and the second mover are usually designed to be nested to achieve movement 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 located relatively inner in the nested structure to form a direct circuit connection with the circuit board. As a result, the ball-type anti-shake motor usually uses a magnetic field displacement detection unit to determine the movement of the second mover, or transmits the electric field through multiple floating plates that do not require circuit connection, so as to avoid directly setting displacement detection related components that require circuit connection on the second mover.

[0004] However, the current displacement detection method of the ball-type anti-shake motor has at least the following disadvantages: the magnetic field displacement detection unit is easily affected by the change of the magnetic field in the environment, resulting in inaccurate detection results. The transmission of the electric field by multiple floating plates will reduce the capacitance value of the capacitor structure formed while the floating plates transmit the electric field, 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 electronic device, to construct a capacitive detection unit that combines series capacitors and parallel capacitors, to change the detection result of the capacitive detection unit by changing the size of the parallel capacitance value, to avoid the reduction effect of the capacitance value in the multi-layer series floating plate structure, and to improve the sensitivity of position detection.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a ball-type anti-shake motor, including: a first mover, a second mover, a first ball, a second ball, a circuit board, a base and a shell; the first mover uses the first ball to make a relative displacement with the base in a focusing direction; the second mover uses the second ball to make a relative displacement with the base in a shaking direction; wherein the shaking direction is perpendicular to the focusing direction; an emitting 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 also arranged on the circuit board, and the first receiving electrode plate is opposite to the first floating electrode plate. The plates are arranged relative to each other; the first receiving plate and the first floating plate form a first capacitor, the first floating plate and the second floating plate form a second capacitor, the second floating plate and the shell are arranged relative to each other to form a third capacitor, and the transmitting plate and the first floating plate form a fourth capacitor; when the second mover moves in the shaking direction, the distance or the facing area between the first floating plate and the second floating plate changes, and the overall capacitor formed by connecting the second capacitor and the third capacitor in series and in parallel with the first capacitor is then connected 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 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, the embodiment of the present invention forms a detection capacitor by providing an emitter plate and a receiving plate on the circuit board, and a first floating plate on the first mover. At the same time, a second floating plate opposite to the first floating plate is provided on the second mover. The second capacitor formed by the second floating plate and the first floating plate is connected in parallel with the capacitor formed by the emitter plate and the receiving plate with the aid of the first floating plate, and the change in the capacitance value of the parallel second capacitor is used to affect the capacitance signal received by the receiving plate. Since the capacitance value of the second capacitor changes due to the movement distance of the second mover, the change in the capacitance signal received by the receiving plate can reflect the movement distance of the second mover. By constructing the above-mentioned capacitive detection unit by means of parallel capacitors, the reduction in the capacitance value of the capacitance structure caused by the series connection of multiple floating plates can be reduced, thereby improving the sensitivity of detection.

[0009] In addition, the first floating electrode plate includes a side electrode plate arranged on the side of the first mover, a bottom electrode plate arranged on the bottom of the first mover, and an extended electrode plate arranged at a distance from the side electrode plate; wherein the side electrode plate is arranged opposite to the emitter electrode plate, and the side electrode plate, the bottom electrode plate and the extended electrode plate carry the same amount of charge; the first capacitor is composed of the first receiving electrode plate and the extended 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 emitter electrode plate and the side electrode plate.

[0010] In addition, the shaking direction includes: an X-axis direction and a Y-axis direction, wherein the X-axis direction and the Y-axis direction are both 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 emitter plate includes: an X-axis emitter plate and a Y-axis emitter plate; the side plate includes: an X-axis side plate and a Y-axis side plate; the bottom plate includes: an X-axis bottom plate and a Y-axis bottom plate, the extension plate includes: an X-axis extension plate and a Y-axis extension plate; the second floating plate includes In summary: a second X-axis floating plate and a second Y-axis floating plate; the first receiving plate includes: an X-axis receiving plate and a Y-axis receiving plate; the X-axis emitting plate, the X-axis side plate, the X-axis bottom plate, the X-axis extension plate, the second X-axis floating plate and the X-axis receiving plate constitute an X-axis direction detection unit; the Y-axis emitting plate, the Y-axis side plate, the Y-axis bottom plate, the Y-axis extension plate, the second Y-axis floating plate and the Y-axis receiving plate 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 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.

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

[0013] In addition, the facing area between the emitter plate and the side plate remains unchanged.

[0014] In addition, 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.

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

[0016] In addition, the ball-type anti-shake motor also includes: a second receiving electrode plate arranged on the circuit board, the number of the second receiving electrodes is two, and the two second receiving electrodes are arranged in sequence in the focusing direction, and the first floating electrode plate includes: a Z-axis floating electrode plate, and the two second receiving electrodes are arranged opposite to the Z-axis floating electrode plate; when the first mover moves along the focusing direction, the first change in the area facing each other between the Z-axis floating electrode plate and one of the second receiving electrodes is equal to the second change in the area facing each other between the Z-axis floating electrode plate and the other second receiving electrode plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1 It is a schematic diagram of the exploded structure of the ball-type anti-shake motor according to the embodiment of the present scheme; Figure 2 It is a schematic diagram of the principle of the vibration direction displacement detection structure in the ball-type anti-shake motor in the embodiment of the present solution; Figure 3 is a schematic diagram of relevant parameters of the vibration direction displacement detection structure in the ball-type anti-shake motor according to the embodiment of the present solution; Figure 4 This is a schematic diagram of the corresponding relationship between the capacitance value of C2 in the ball-type anti-shake motor and the shake direction detection capacitance C in the embodiment of the present solution; Figure 5 is a schematic diagram of the three-dimensional structure of a ball-type anti-shake motor according to an embodiment of the present solution; Figure 6 is a schematic diagram of a top view of the structure of a ball-type anti-shake motor according to an embodiment of the present solution; Figure 7 is a schematic diagram of parameters related to the second floating electrode plate and the bottom electrode plate of the ball-type anti-shake motor according to an embodiment of the present solution; Figure 8 It is a schematic diagram of the parameters related to the emitter plate and the side plate of the ball-type anti-shake motor in the embodiment of the present scheme.

[0019] Description of reference numerals: 1- Circuit board; 2- Base; 31-first mover; 32-second mover; 41-first ball; 42-second ball; 51-emitter plate; 52-side plate; 53-bottom plate; 54-extended plate; 55-second floating plate; 56-first receiving plate; 57-Z-axis floating plate; 511-X-axis emitter plate; 512-Y-axis emitter plate; 521-X-axis side plate; 522-Y-axis side plate; 531-X-axis bottom plate; 532-Y-axis bottom plate; 541-X-axis extended plate; 542-Y-axis extended plate; 551-second X-axis floating plate; 552-second Y-axis floating plate; 561-X-axis receiving plate; 562-Y-axis receiving plate; 60- a second receiving plate; 7- Housing. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the embodiments of the present invention, many technical details are provided to enable readers to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present invention can be implemented.

[0021] The following embodiments are divided for the convenience of description and shall not constitute any limitation on the specific implementation of the present invention. The embodiments may be combined with each other and referenced to each other without contradiction.

[0022] An embodiment of the present invention relates to a ball type anti-shake motor, such as Figure 1 As shown, the ball-type anti-shake motor includes: a circuit board 1, a base 2, a first mover 31, a second mover 32, a first ball 41, a second ball 42 and a housing 7; the first mover 31 uses the first ball 41 to move relative to the base 2 in the focusing direction; the second mover 32 uses the second ball 42 to move relative to the base 2 in the shaking direction; wherein the shaking direction is perpendicular to the focusing direction.

[0023] The structure of the detection unit used to detect the displacement in the shaking direction is as follows: Figure 2 As shown, the circuit board 1 is provided with an emitter plate 51, and the first mover 31 is provided with a first floating plate (such as Figure 2As shown in the figure, the second mover 32 is provided with a second floating plate 55 opposite to the first floating plate; a first receiving plate 56 is also provided on the circuit board 1, and the first receiving plate 56 is arranged opposite to the first floating plate; the first receiving plate 56 and the first floating plate form a first capacitor, the first floating plate and the second floating plate 55 form a second capacitor, the second floating plate 55 and the shell 7 are arranged opposite to each other to form a third capacitor, and the emitter plate 51 and the first floating plate form a fourth capacitor; when the second mover 32 moves in the shaking direction, the distance or the facing area between the first floating plate and the second floating plate 55 changes, and the overall capacitor formed by connecting the second capacitor and the third capacitor in series and connecting them in parallel with the first capacitor is connected in series with the fourth capacitor to form a shaking direction detection capacitor, and the moving distance of the second mover 32 in the shaking direction is determined according to the change of the shaking direction detection capacitor.

[0024] Compared with the related art, the embodiment of the present invention forms a detection capacitor by providing an emitter plate and a receiving plate on the circuit board, and a first floating plate on the first mover. At the same time, a second floating plate opposite to the first floating plate is provided on the second mover. The second capacitor formed by the second floating plate and the first floating plate is connected in parallel with the capacitor formed by the emitter plate and the receiving plate with the aid of the first floating plate, and the change in the capacitance value of the parallel second capacitor is used to affect the capacitance signal received by the receiving plate. Since the capacitance value of the second capacitor changes due to the movement distance of the second mover, the change in the capacitance signal received by the receiving plate can reflect the movement distance of the second mover. By constructing the above-mentioned capacitive detection unit by means of parallel capacitors, the reduction in the capacitance value of the capacitance structure caused by the series connection of multiple floating plates can be reduced, thereby improving the sensitivity of detection.

[0025] like Figure 2 As shown, it is a schematic diagram of the constructed jitter direction displacement detection unit. Among them, the emitter plate 51 is connected to the Tx transmit signal end of the chip IC, the first receiving plate 56 is connected to the Rx receive signal end of the chip IC, and the first floating plate includes a side plate 52 arranged on the side of the first mover 31, a bottom plate 53 arranged on the bottom surface of the first mover, and an extension plate 54 arranged at intervals from the side plate 52; wherein the side plate 52 is arranged opposite to the emitter plate 51, and the side plate 52, the bottom plate 53 and the extension plate 54 carry the same amount of charge.

[0026] like Figure 3As shown, the first capacitor C1 is composed of the first receiving electrode plate 56 and the extended electrode plate 54, the second capacitor C2 is composed of the bottom electrode plate 53 and the second floating electrode plate 55, the third capacitor C3 is composed of the second floating electrode plate 55 and the shell 7, and the fourth capacitor C4 is composed of the emitter electrode plate 51 and the side electrode plate 52. The second capacitor C2 and the third capacitor C3 are connected in series, and the overall capacitor connected 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 = (C2xC3) / (C2+C3); C23 and C1 are connected in parallel to obtain C231, C231 = C23+C1; Connected in series with C4 to form a jitter direction detection capacitor C. ; Assume that the voltage of the Tx transmitting signal terminal is Va, the voltages of the side plate 52, the bottom plate 53, and the extended plate 54 are all Vb, the voltage of the second floating plate 55 is Vd, and the voltage of the Rx receiving signal terminal is Vc. Since the Rx receiving signal terminal is a high impedance terminal, Vc can be equivalent to grounding. The current I of the Tx transmitting signal terminal is obtained. 总 ; ; Where j is the imaginary unit, is the angular frequency. At the same time, the current I at the Rx receiving signal end can be obtained C ; .

[0027] It can be seen from this 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 ​​of the Tx transmitting signal end and the Rx receiving signal end.

[0028] Taking the change of the facing area between the first floating plate and the second floating plate as the second mover moves as an example, the influence of C2 on the capacitance value of C is specifically described: like Figure 3 As shown, when the second mover 32 moves along the shaking direction, the position of the first mover 31 does not change, so the capacitance values ​​of C1 and C4 do not change. Because C3 is the self-capacitance between the second floating electrode 55 and the ground (usually relatively large), the capacitance value of C3 is almost unaffected by the movement of the second mover 32. The second floating electrode 55 set on the second mover moves accordingly, and the area facing the first floating electrode (specifically the bottom electrode 53) on the first mover changes, thereby affecting the capacitance value of C2. The shaking direction detection capacitor C changes due to the change in the capacitance value of C2.

[0029] Assuming that C1 and C4 are fixed capacitors of 200fF, and C3 is the capacitance between the second floating plate and the ground of 500fF (self-capacitance is relatively large), we can get Figure 4 The simulation results of the change relationship between the capacitance value of the shaking direction detection capacitor C and C2 are shown in the figure. It can be seen from the figure that the value of C changes with the change of C2, and the two are in a positively correlated linear change relationship. Therefore, the capacitance of the shaking direction detection capacitor C can be changed by only changing the capacitance value of C2, thereby achieving the purpose of using the shaking direction detection capacitor to determine the movement of the second mover.

[0030] In addition, if Figure 5 to Figure 6 As shown in the figure, it is a schematic diagram of the structure of the ball-type anti-shake motor in different dimensions. It can be seen from the figure that the shaking direction includes the X-axis direction and the Y-axis direction, wherein 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 emitter plate 51 includes: an X-axis emitter plate 511 and a Y-axis emitter plate 512; the side plate 52 includes: an X-axis side plate 521 and a Y-axis side plate 522; the bottom plate 53 includes: an X-axis bottom plate 531 and a Y-axis bottom plate 532, and the extension plate 54 includes: an X-axis extension plate 541 and a Y-axis extension plate 542; the The second floating plate 55 includes: a second X-axis floating plate 551 and a second Y-axis floating plate 552; the first receiving plate 56 includes: an X-axis receiving plate 561 and a Y-axis receiving plate 562; the X-axis emitting plate 511, the X-axis side plate 521, the X-axis bottom plate 531, the X-axis extension plate 541, the second X-axis floating plate 551 and the X-axis receiving plate 561 constitute an X-axis direction detection unit; the Y-axis emitting plate 512, the Y-axis side plate 522, the Y-axis bottom plate 532, the Y-axis extension plate 542, the second Y-axis floating plate 552 and the Y-axis receiving plate 562 constitute a Y-axis direction detection unit.

[0031] When the second mover 32 moves in the X-axis direction, the facing area of ​​the second X-axis floating electrode plate 551 and the X-axis bottom electrode plate 531 changes, and the facing area of ​​the second Y-axis floating electrode plate 552 and the Y-axis bottom electrode plate 532 does not change, so as to avoid the distance moved in the X direction affecting the detection result of the Y-axis detection unit. Similarly, when the second mover 32 moves in the Y-axis direction, the facing area of ​​the second Y-axis floating electrode plate 552 and the Y-axis bottom electrode plate 532 changes, and the facing area of ​​the second X-axis floating electrode plate 551 and the X-axis bottom electrode plate 531 does not change, so as to avoid the distance moved in the Y direction affecting the detection result of the X-axis detection unit.

[0032] 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, the second Y-axis floating plate 552 and the Y-axis bottom plate 532 are set as follows: Figure 7 As shown, assuming that the ball-type anti-shake motor is in the initial position (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 electrode 551 and the left edge of the X-axis bottom electrode 531 is a, and the distance between the right edge of the second X-axis floating electrode 551 and the right edge of the X-axis bottom electrode 531 is b, wherein a is greater than the stroke of the second mover moving to the left in the initial position, and b is greater than the stroke of the second mover moving to the right in the initial position. Figure 7 The left-right direction is the Y-axis direction. In addition, the distance between the lower edge of the second Y-axis floating electrode plate 552 and the lower edge of the Y-axis bottom electrode plate 532 is c, and the distance between the upper edge of the second Y-axis floating electrode plate 552 and the upper edge of the Y-axis bottom electrode plate 532 is d, where c is greater than the stroke of the second mover moving downward in the initial position, and d is greater than the stroke of the second mover moving upward in the initial position. Figure 7 The up-down direction shown is the X-axis direction.

[0033] In addition, no matter the first mover 31 moves in the focus direction or the second mover 32 moves in the shaking direction, the facing area of ​​the first receiving electrode plate 56 and the extension electrode plate 54 remains unchanged. The facing area of ​​the emitter electrode plate 51 and the side electrode plate 52 remains unchanged. Taking the relative position of the emitter electrode plate 51 and the side electrode plate 52 as an example, Figure 8 As shown, the orthographic projection of the side plate 52 toward the emitter plate 51 completely falls within the emitter plate 51, the distance between the upper edge of the side plate 52 and the upper edge of the emitter plate 51 is e, and the distance between the lower edge of the side plate 52 and the lower edge of the emitter plate 51 is also e, and 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 emitter plate 51 in the left-right direction, ensuring that the slight jitter of the first mover during the sliding of the first ball, so that a slight displacement occurs in the non-focusing direction, the size of the area facing the side plate 52 and the emitter plate 51 will not be affected. The change in the area facing the side plate 52 and the emitter plate 51 that is minimized affects the capacitors C4 and C1.

[0034] Similarly, in order to ensure that the facing area between the first receiving electrode plate 56 and the extended electrode plate 54 remains unchanged, the positional relationship between the first receiving electrode plate 56 and the extended electrode plate 54 is arranged in the same manner as that between the side electrode plate 52 and the emitting electrode plate 51 .

[0035] In addition, in order to reduce the occupancy of different sides of the circuit board, the X-axis receiving plate and the Y-axis receiving plate can be set on the same side of the circuit board, that is, the plane where the X-axis receiving plate and the plane where the Y-axis receiving plate are located are the same plane.

[0036] In addition, the second X-axis floating plate and the second Y-axis floating plate are electrically connected via a conductor. Figure 5 As shown, in order to fit the lens shape of the ball-type anti-shake motor, a ring-shaped carrier bracket can be set on the periphery of the lens. The carrier bracket is conductive, and the second X-axis floating electrode 551 and the second Y-axis floating electrode 552 are respectively connected to the carrier bracket by wires to achieve electrical connection between the two.

[0037] In addition, if Figure 5 As shown, the ball-type anti-shake motor also includes: a second receiving electrode plate 60 arranged 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, and the first floating electrode plate includes: a Z-axis floating electrode plate 57, and the two second receiving electrode plates 60 are arranged opposite to the Z-axis floating electrode plate 57; the Z-axis floating electrode plate 57 arranged opposite to the second receiving electrode plate 60 can be a electrode plate connected to the side electrode plate 52 through a wire, or a electrode plate of the same material extending from the side electrode plate. When the first mover moves along the focusing direction, the first change in the area facing each other between the Z-axis floating electrode plate 57 and one of the second receiving electrode plates 60 is equal to the second change in the area facing each other between the Z-axis floating electrode plate 57 and the other second receiving electrode plate 60. In order to perform differential calculation using the capacitance formed by the Z-axis floating plate 57 and one of the second receiving plates 60 and the capacitance formed by the Z-axis floating plate 57 and the other second receiving plate 60, the capacitance signal can be corrected or denoised, etc., to eliminate noise that affects the accuracy of the calculation results caused by environmental factors, human operation factors, or movement in the direction of jitter, and at the same time improve the sensitivity of the lens position movement control.

[0038] In addition, the ball-type anti-shake motor includes a driving unit, including a first driving magnet arranged on the first mover, and a first driving coil arranged on the base. The first driving magnet and the first driving coil are arranged 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, and the first driving coil is connected to the circuit board for power supply and control through the external circuit and IC. After the first driving coil is energized, an induced magnetic field is generated, and the interaction between the first driving coil 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 fed back to the first driving magnet. Due to the presence of the first ball 41, the first mover 31, which is the carrier of the first driving magnet, can move relative to the base 2, thereby realizing the driving of the first mover 31. The magnitude of the Lorentz force can be controlled by changing the current in the first driving coil, and the magnitude of the force on the first mover 31 can be changed to control the moving distance.

[0039] Similarly, regarding the drive of the second mover, the drive unit includes a second drive magnet arranged on the second mover, and a second drive coil arranged on the base, and the second drive magnet is arranged opposite to the second drive coil, and is used to drive the second mover to move in the shaking direction. The driving principle is the same as the driving principle of the first mover mentioned above. Among them, the second drive coil includes an X-axis drive coil and a Y-axis drive coil, and the corresponding second drive magnet includes: an X-axis drive magnet and a Y-axis drive magnet, the X-axis drive coil is arranged opposite to the X-axis drive magnet, and the Y-axis drive coil is arranged opposite to the Y-axis drive magnet. The first drive magnet and the first drive coil, the X-axis drive coil and the X-axis drive magnet, the Y-axis drive coil and the Y-axis drive magnet, the three groups of drive units are respectively located on different sides of the motor to avoid mutual influence of the drive magnetic field and affect the driving effect of the motor.

[0040] In order to ensure the driving effect of the drive unit, the drive unit is usually set in the middle area of ​​the motor side. As mentioned above, the capacitive detection unit is also set on the motor side. In order to ensure the driving effect of the motor, the setting position of the capacitive detection unit can be avoided, that is, the capacitive detection unit set on the same motor side as the drive unit is set in the two side areas of the motor side, and the middle area is used as the setting position of the drive unit.

[0041] In order to reduce the volume of the ball-type anti-shake motor, the internal components of the ball-type anti-shake motor can be nested in the focus direction. For example, the second mover 32 is set inside the first mover 31, that is, the first mover 31 is a hollow frame structure, the middle area is used to accommodate the lens, and the frame surrounds the outside of the second mover 32. Such a structure allows the second mover 32 to at least partially overlap with the first mover 31 in the focus direction, which can reduce the thickness of the ball-type anti-shake motor in the focus direction. Similarly, the base 2 at least partially overlaps with the first mover 31 in the focus direction, which can also reduce the thickness of the ball-type anti-shake motor in the focus direction. The circuit board 1 is set on the side wall of the base 2 to facilitate the electrical connection between the first detection unit and the second detection unit set in the ball-type anti-shake motor. The circuit board 1 can be a flexible circuit board FPC, which is more convenient to be set to fit the outer surface of the base. The movement of the first mover in the focus direction can drive the second mover to move in the focus direction, but the second mover itself can only move in the shaking direction, and the movement of the second mover in the shaking direction will not drive the first mover to move.

[0042] Another feasible embodiment of the present invention relates to an electronic device, including the above-mentioned ball-type anti-shake motor. The ball-type anti-shake motor is used in conjunction with a lens to achieve image acquisition and automatically calibrate the vibration of the external environment to improve the quality of image acquisition.

[0043] Compared with the related art, the electronic device provided by the embodiment of the present invention is provided with the ball-type anti-shake motor provided by the aforementioned embodiment. Therefore, it also has the technical effects provided by the aforementioned embodiment, which will not be elaborated here.

[0044] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present invention, and that in actual applications, various changes may be made in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A ball type anti-shake motor, characterized in that: include: A first mover, a second mover, a first ball, a second ball, a circuit board, a base and a housing; The first mover uses the first ball to cause relative displacement with the base in the focusing direction; The second mover uses the second ball to make relative displacement with the base in a shaking direction; wherein the shaking direction is perpendicular to the focusing direction; The circuit board is provided with an emitter plate, the first mover is provided with a first floating plate, and the second mover is provided with a second floating plate opposite to the first floating plate; The circuit board is also provided with a first receiving electrode plate, and the first receiving electrode plate is arranged opposite to the first floating electrode plate; The first receiving plate and the first floating plate form a first capacitor, the first floating plate and the second floating plate form a second capacitor, the second floating plate and the housing are arranged opposite to each other to form a third capacitor, and the transmitting plate and the first floating plate form a fourth capacitor; When the second mover moves in the shaking direction, the distance or the facing area between the first floating electrode and the second floating electrode changes. The overall capacitor formed by connecting the second capacitor and the third capacitor in series and in parallel with the first capacitor is then connected in series with the fourth capacitor to form a shaking direction detection capacitor. The moving distance of the second mover in the shaking direction is determined according to the change of the shaking direction detection capacitor.

2. The ball type anti-shake motor according to claim 1, characterized in that: The first floating electrode plate includes a side electrode plate arranged on the side of the first mover, a bottom electrode plate arranged on the bottom of the first mover, and an extension electrode plate arranged at a distance from the side electrode plate; wherein the side electrode plate is arranged opposite to the emitter 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 plate and the extending plate, the second capacitor is composed of the bottom plate and the second floating plate, and the fourth capacitor is composed of the emitting plate and the side plate.

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

4. The ball type anti-shake motor according to claim 3, characterized in that: When the second mover moves in the X-axis direction, the facing area of ​​the second X-axis floating electrode plate and the X-axis bottom electrode plate changes, and the facing area of ​​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, characterized in that: The facing area between the first receiving electrode plate and the extending electrode plate remains unchanged.

6. The ball type anti-shake motor according to claim 2, characterized in that: The facing area between the emitter plate and the side plate remains unchanged.

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 plate and the second Y-axis floating plate are electrically connected via a conductor.

9. The ball type anti-shake motor according to claim 1, characterized in that: Also includes: A second receiving electrode plate is arranged on the circuit board, the number of the second receiving electrode plates is two, and the two second receiving electrode plates are arranged in sequence in the focusing direction, The first floating plate comprises: a Z-axis floating plate, and the two second receiving plates are both arranged opposite to the Z-axis floating plate; When the first mover moves along the focusing direction, a first change in the facing area between the Z-axis floating plate and one of the second receiving plates is equal to a second change in the facing area between the Z-axis floating plate and another of the second receiving plates.

10. An electronic device, characterized in that: include: A ball type anti-shake motor as claimed in any one of claims 1 to 9.

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