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 first floating electrode plate and a second floating electrode plate which are electrically connected are arranged on the same side of a second mover, and a first emitting electrode plate opposite to the first floating electrode plate and a first receiving electrode plate opposite to the second floating electrode plate are arranged on the same side of a circuit board. A hollowed-out area is arranged on a first mover outside the periphery of the second mover, and the hollowed-out area is at least in the facing position of the first floating electrode plate and the first emitting electrode plate, and the facing position of the second floating electrode plate and the first receiving electrode plate. The first floating electrode plate and the first emitting electrode plate form a first capacitor, and the second floating electrode plate and the first receiving electrode plate form a second capacitor. The capacitance value generated by the series equivalent capacitance of the first capacitor and the second capacitor is used to determine the moving distance of the second mover in the shaking direction. Thereby, the detection accuracy and sensitivity are 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 an electronic device. Background Art

[0002] The ball-type anti-shake motor drives a ball to roll in a rolling groove provided on a 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 jitter direction, usually, a first mover and a second mover are nestedly designed 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, which is relatively inside the nested structure, to directly form an electrical connection with the circuit board. This results in that the ball-type anti-shake motor usually adopts a magnetic field type displacement detection unit to determine the movement of the second mover, or uses the transmission effect of an electric field by a plurality of floating electrodes that do not require electrical connection, so as to avoid directly arranging displacement detection-related components 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 drawbacks: 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 a plurality of floating electrodes, the capacitance value of the formed capacitor structure will be reduced while the electric field is transmitted by the floating electrodes, 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. By arranging a first floating electrode and a second floating electrode on the same side of the second mover, and arranging a first emitting electrode opposite to the first floating electrode and a first receiving electrode opposite to the second floating electrode on the same side of the circuit board, it is ensured that when moving in the jitter direction, the distances between the first floating electrode and the first emitting electrode, and between the second floating electrode and the first receiving electrode change synchronously, 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 and a base; 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; the first mover is arranged on the periphery of the second mover, the circuit board is arranged on the periphery of the first mover, and the circuit board is arranged on the side of the base; the second mover is provided with a first floating electrode plate and a second floating electrode plate which are electrically connected to each other, the circuit board is provided with a first transmitting electrode plate oppositely arranged with the first floating electrode plate, and a first receiving electrode plate oppositely arranged with the second floating electrode plate, the first floating electrode plate and the first transmitting electrode plate are oppositely arranged in the shaking direction, and the second floating electrode plate and the first receiving electrode plate are oppositely arranged in the shaking direction, the first transmitting electrode plate and the first receiving electrode plate are arranged on the same side, and the first floating electrode plate and the second floating electrode plate are arranged on the same side; the first mover is provided with a hollow area which is at least in the facing position of the first floating electrode plate and the first transmitting electrode plate, and the facing position of the second floating electrode plate and the first receiving electrode plate; the first floating electrode plate and the first transmitting electrode plate form a first capacitor, the second floating electrode plate and the first receiving electrode plate form a second capacitor, and the moving distance of the second mover in the shaking direction is determined by using the capacitance value generated by the series equivalent capacitance of the first capacitor and the second capacitor.

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

[0008] In the embodiment of the present invention, compared with the prior art, the ball-type anti-shake motor is provided with a first mover and a second mover that move in different directions. Among them, the first mover moves in the focusing direction of the motor through the first ball, and the second mover moves in the shaking direction of the motor through the second ball. A first floating electrode plate and a second floating electrode plate are arranged on the same side of the second mover, and a first emitting electrode plate oppositely arranged with the first floating electrode plate and a first receiving electrode plate oppositely arranged with the second floating electrode plate are arranged on the same side of the circuit board. Since the first floating electrode plate and the first emitting electrode plate are oppositely arranged in the shaking direction, and the second floating electrode plate and the first receiving electrode plate are oppositely arranged in the shaking direction, when the second mover generates a displacement in the shaking direction, while the distance between the first floating electrode plate and the first emitting electrode plate changes, the distance between the second floating electrode plate and the first receiving electrode plate changes synchronously. The capacitance values generated by the first capacitor composed of the first emitting electrode plate and the first floating electrode plate and the second capacitor composed of the first receiving electrode plate and the second floating electrode plate change simultaneously. Compared with the solution of using the electric field transmission between multiple floating electrode plates to form a capacitance component, the change in the capacitance value of the equivalent capacitance in series of the first capacitor and the second capacitor in this case is more sensitive to the displacement change, thereby improving the sensitivity of position detection. In addition, in order to ensure that the first floating electrode plate and the second floating electrode plate arranged on the second mover can be directly opposite to the circuit board through the first mover outside the second mover, a hollowed-out area is arranged on the first mover, and the hollowed-out area is at least in the directly opposite positions of the first floating electrode plate and the first emitting electrode plate, and the directly opposite positions of the second floating electrode plate and the first receiving electrode plate, so as to avoid the first mover from blocking the capacitance signal and improve the detection accuracy and sensitivity.

[0009] In addition, the jitter directions include the X-axis direction and the Y-axis direction, where 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 first emission electrode plate includes an X-axis emission electrode plate and a Y-axis emission electrode plate; the first reception electrode plate includes an X-axis reception electrode plate and a Y-axis reception electrode plate; the first floating electrode plate includes a first X-axis floating electrode plate and a first Y-axis floating electrode plate, and the second floating electrode plate includes a second X-axis floating electrode plate and a second Y-axis floating electrode plate; the first X-axis floating electrode plate and the second X-axis floating electrode plate are arranged on the first side surface of the second mover, the first Y-axis floating electrode plate and the second Y-axis floating electrode plate are arranged on the second side surface of the second mover, and the first side surface and the second side surface are adjacent surfaces; the first X-axis floating electrode plate and the X-axis emission electrode plate are oppositely arranged in the X-axis direction, and the second X-axis floating electrode plate and the X-axis reception electrode plate are oppositely arranged in the X-axis direction, and the moving distance of the second mover in the X-axis direction is determined by using the first X-axis floating electrode plate, the X-axis emission electrode plate, the second X-axis floating electrode plate and the X-axis reception electrode plate; the first Y-axis floating electrode plate and the Y-axis emission electrode plate are oppositely arranged in the Y-axis direction, and the second Y-axis floating electrode plate and the Y-axis reception electrode plate are oppositely arranged in the Y-axis direction, and the moving distance of the second mover in the Y-axis direction is determined by using the first Y-axis floating electrode plate, the Y-axis emission electrode plate, the second Y-axis floating electrode plate and the Y-axis reception electrode plate.

[0010] In addition, the number of each of the first X-axis floating electrode plate, the X-axis emission electrode plate, the second X-axis floating electrode plate and the X-axis reception electrode plate for determining the moving distance of the second mover in the X-axis direction is two, forming two groups of X-axis direction detection units. Each group of X-axis direction detection units includes a first X-axis floating electrode plate, the X-axis emission electrode plate, the second X-axis floating electrode plate and the X-axis reception electrode plate, and the two groups of X-axis direction detection units are symmetrically arranged with respect to the lens central axis of the ball-type anti-shake motor; the number of each of the first Y-axis floating electrode plate, the Y-axis emission electrode plate, the second Y-axis floating electrode plate and the Y-axis reception electrode plate for determining the moving distance of the second mover in the Y-axis direction is two, forming two groups of Y-axis direction detection units. Each group of Y-axis direction detection units includes a first Y-axis floating electrode plate, the Y-axis emission electrode plate, the second Y-axis floating electrode plate and the Y-axis reception electrode plate, and the two groups of Y-axis direction detection units are symmetrically arranged with respect to the lens central axis of the ball-type anti-shake motor.

[0011] In addition, during the movement of the second mover in the jitter direction, the positive projection of the first floating plate towards the first emitting plate always completely falls on the first emitting plate, and the positive projection of the second floating plate towards the first receiving plate always completely falls on the first receiving plate.

[0012] In addition, the ball-type anti-shake motor further includes: a second emitting plate and a second receiving plate disposed on the circuit board, and a third floating plate disposed on the first mover and oppositely disposed with the second emitting plate and the second receiving plate in the jitter direction; when the first mover moves in the focusing direction, the capacitance value generated by the capacitance formed by the second emitting plate, the second receiving plate, and the third floating plate determines the moving distance of the first mover in the focusing direction.

[0013] In addition, the number of the second receiving plates is two; the two second receiving plates are arranged in sequence in the focusing direction. When the first mover moves in the focusing direction, the first change amount of the facing area between the third floating plate and one of the second receiving plates is equal to the second change amount of the facing area between the third floating plate and the other second receiving plate; when the first mover moves in the focusing direction, the facing area between the third floating plate and the second emitting plate does not change.

[0014] In addition, the first emitting plate and the second emitting plate are integrally formed as a common emitting plate; the first positive projection area of the first floating plate towards the common emitting plate does not overlap with the second positive projection area of the third floating plate towards the common emitting plate.

[0015] In addition, the ball-type anti-shake motor further includes: a driving unit; the driving unit 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 oppositely disposed to drive the first mover to move in the focusing direction; 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 oppositely disposed to drive the second mover to move in the jitter direction.

[0016] In addition, the ball-type anti-shake motor further includes: a gland fitting the second mover; the gland abuts against the second mover in the focusing direction, and the gland restricts the movement of the second mover in the focusing direction. Description of the Drawings

[0017] One or more embodiments are illustrated by way of example in the accompanying drawings, which do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the drawings in the figures do not constitute a scale limitation.

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

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

[0020] Figure 3 is a top view structural schematic diagram of a ball-type anti-shake motor according to an embodiment of the present solution;

[0021] Figure 4 is a three-dimensional structural schematic diagram of a ball-type anti-shake motor according to an embodiment of the present solution;

[0022] Figure 5 is a schematic diagram of the correspondence between the jitter direction displacement and the capacitance signal in a ball-type anti-shake motor according to an embodiment of the present solution;

[0023] Figure 6 is a schematic diagram of the correspondence between the jitter direction displacement and the differential capacitance signal in a ball-type anti-shake motor according to an embodiment of the present solution;

[0024] Figure 7 is a schematic diagram of the relevant parameters of the first floating plate, the second floating plate, the first emitting plate, and the first receiving plate in a ball-type anti-shake motor according to an embodiment of the present solution;

[0025] Figure 8 is a schematic diagram of the relevant parameters of the third floating plate, the second emitting plate, and the second receiving plate in a ball-type anti-shake motor according to an embodiment of the present solution.

[0026] Description of 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 - First emission electrode plate; 52 - First receiving electrode plate; 53 - First floating electrode plate; 54 - Second floating electrode plate; 511 - X-axis emission electrode plate; 512 - Y-axis emission electrode plate; 521 - X-axis receiving electrode plate; 522 - Y-axis receiving electrode plate; 531 - First X-axis floating electrode plate; 532 - First Y-axis floating electrode plate; 541 - Second X-axis floating electrode plate; 542 - Second Y-axis floating electrode plate;

[0032] 61 - Second emission electrode plate; 62 - Second receiving electrode plate; 63 - Third floating electrode plate;

[0033] 7 - gland;

[0034] 8 - housing;

[0035] 9 - lens;

[0036] 101 - X-axis drive coil; 102 - Y-axis drive coil; 103 - First drive coil; 104 - First drive magnet. Detailed implementation mode

[0037] 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 provided 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.

[0038] The division of the following embodiments is for convenience of description and should not constitute any limitation to the specific implementation of the present invention. The various embodiments can be combined and cross-referenced with each other on the premise of no contradiction.

[0039] 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: a circuit board 1, a base 2, a first mover 31, a second mover 32, a first ball 41, and a second ball 42; the first mover 31 uses the first ball 41 to make a relative displacement with the base 2 in the focusing direction; the second mover 32 uses the second ball 42 to make a relative displacement with the base 2 in the shaking direction; wherein, the shaking direction is perpendicular to the focusing direction; the first mover 31 is arranged on the periphery of the second mover 32, the circuit board 1 is arranged on the periphery of the first mover 31, and the circuit board 1 is arranged on the side of the base 2; as Figure 2As shown in the figure, the second mover 32 is provided with a first floating plate 53 and a second floating plate 54 which are electrically connected to each other. On the circuit board, a first emitting plate 51 is arranged opposite to the first floating plate 53, and a first receiving plate 52 is arranged opposite to the second floating plate 54. The first floating plate 53 and the first emitting plate 51 are arranged opposite to each other in the shaking direction, and the second floating plate 54 and the first receiving plate 52 are arranged opposite to each other in the shaking direction. The first emitting plate 51 and the first receiving plate 52 are arranged on the same side, and the first floating plate 53 and the second floating plate 54 are arranged on the same side. The first mover 31 is provided with a hollow area which is at least located at the position where the first floating plate 53 and the first emitting plate 51 face each other, and the position where the second floating plate 54 and the first receiving plate 52 face each other. The first floating plate 53 and the first emitting plate 51 form a first capacitor, and the second floating plate 54 and the first receiving plate 52 form a second capacitor. The moving distance of the second mover 32 in the shaking direction is determined by the capacitance value generated by the series equivalent capacitance of the first capacitor and the second capacitor.

[0040] In the embodiment of the present invention, compared with the prior art, the ball-type anti-shake motor is provided with a first mover and a second mover that move in different directions. Among them, the first mover moves in the focusing direction of the motor through the first ball, and the second mover moves in the shaking direction of the motor through the second ball. The first floating plate and the second floating plate are arranged on the same side of the second mover, and on the circuit board, a first emitting plate arranged opposite to the first floating plate and a first receiving plate arranged opposite to the second floating plate are arranged on the same side. Since the first floating plate and the first emitting plate are arranged opposite to each other in the shaking direction, and the second floating plate and the first receiving plate are arranged opposite to each other in the shaking direction, when the second mover generates a displacement in the shaking direction, while the distance between the first floating plate and the first emitting plate changes, the distance between the second floating plate and the first receiving plate changes synchronously. The capacitance values generated by the first capacitor formed by the first emitting plate and the first floating plate and the second capacitor formed by the first receiving plate and the second floating plate change simultaneously. Compared with the scheme of forming a capacitor component by the electric field transmission between multiple floating plates, the change of the capacitance value of the series equivalent capacitance of the first capacitor and the second capacitor in this case is more sensitive to the displacement change, thereby improving the sensitivity of position detection. In addition, in order to ensure that the first floating plate and the second floating plate arranged on the second mover can be arranged opposite to the circuit board through the first mover outside the second mover, a hollow area is arranged on the first mover, and the hollow area is at least located at the position where the first floating plate and the first emitting plate face each other, and the position where the second floating plate and the first receiving plate face each other, so as to avoid the first mover from blocking the capacitance signal and improve the detection accuracy and sensitivity.

[0041] As Figure 2As shown, it is a jitter direction displacement detection unit composed of a first emission electrode plate 51, a first reception electrode plate 52, a first floating electrode plate 53, and a second floating electrode plate 54. Among them, the first emission electrode plate 51 is connected to the signal emission end of the chip IC, the first reception electrode plate 52 is connected to the signal reception end of the IC, and the first emission electrode plate 51 and the first reception electrode plate 52 achieve a capacitance effect through the jumping bridging characteristics of the electrically connected first floating electrode plate 53 and second floating electrode plate 54.

[0042] The capacitance formed by the first emission electrode plate 51, the first reception electrode plate 52, the first floating electrode plate 53, and the second floating electrode plate 54 can be regarded as the series connection of a first capacitance formed by the first emission electrode plate 51 and the first floating electrode plate 53 and a second capacitance formed by the first reception electrode plate 52 and the second floating electrode plate 54. Assume that the facing area between the first emission electrode plate 51 and the first floating electrode plate 53 is , the distance is , and the first capacitance is ; the facing area between the first reception electrode plate 52 and the second floating electrode plate 54 is , the distance is , and the second capacitance is . The series equivalent capacitance of the first capacitance and the second capacitance is C = , where ε represents the dielectric constant of the medium, which is determined by the medium between the electrode plates, such as air, water, etc.; k represents the electrostatic constant, also known as the Coulomb constant, indicating that for two point charges with a charge of 1 C each in a vacuum, when the two point charges are 1 m apart, the magnitude of the force between them is 8.987551× N, that is, k = 8.987551× N·m² / C. Therefore, when the facing area between the first emission electrode plate 51 and the first floating electrode plate 53 and the facing area between the first reception electrode plate 52 and the second floating electrode plate 54 always remain unchanged, the signal of the equivalent capacitance changes according to the distance between the first emission electrode plate 51 and the first floating electrode plate 53 and the distance between the first reception electrode plate 52 and the second floating electrode plate 54. Since the first emission electrode plate 51 and the first floating electrode plate 53 are oppositely arranged in the jitter direction, and the first reception electrode plate 52 and the second floating electrode plate 54 are oppositely arranged in the jitter direction, the distance between the first emission electrode plate 51 and the first floating electrode plate 53 and the distance between the first reception electrode plate 52 and the second floating electrode plate 54 are related to the moving distance of the second mover 32 in the jitter direction. Therefore, the moving distance of the second mover 32 in the jitter direction can be known according to the change of the signal of the equivalent capacitance.

[0043] In addition, as Figure 3As shown, the jitter direction includes the X-axis direction and the Y-axis direction. Both the X-axis direction and the Y-axis direction are 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 first emission electrode plate 51 includes: an X-axis emission electrode plate 511 and a Y-axis emission electrode plate 512; the first reception electrode plate 52 includes: an X-axis reception electrode plate 521 and a Y-axis reception electrode plate 522; the first floating electrode plate 53 includes: a first X-axis floating electrode plate 531 and a first Y-axis floating electrode plate 532, and the second floating electrode plate 54 includes: a second X-axis floating electrode plate 541 and a second Y-axis floating electrode plate 542; the first X-axis floating electrode plate 531 and the second X-axis floating electrode plate 541 are arranged on the first side surface of the second mover 32, and the first Y-axis floating electrode plate 532 and the second Y-axis floating electrode plate 542 are arranged on the second side surface of the second mover 32, and the first side surface and the second side surface are adjacent surfaces; the first X-axis floating electrode plate 531 and the X-axis emission electrode plate 511 are oppositely arranged in the X-axis direction, and the second X-axis floating electrode plate 541 and the X-axis reception electrode plate 521 are oppositely arranged in the X-axis direction. The first X-axis floating electrode plate 531, the X-axis emission electrode plate 511, the second X-axis floating electrode plate 541 and the X-axis reception electrode plate 521 are used to determine the moving distance of the second mover in the X-axis direction; the first Y-axis floating electrode plate 532 and the Y-axis emission electrode plate 512 are oppositely arranged in the Y-axis direction, and the second Y-axis floating electrode plate 542 and the Y-axis reception electrode plate 522 are oppositely arranged in the Y-axis direction. The first Y-axis floating electrode plate 532, the Y-axis emission electrode plate 512, the second Y-axis floating electrode plate 542 and the Y-axis reception electrode plate 522 are used to determine the moving distance of the second mover in the Y-axis direction.

[0044] As Figure 3 shown, the number of each electrode plate among the first X-axis floating electrode plate 531, the X-axis emission electrode plate 511, the second X-axis floating electrode plate 541 and the X-axis reception electrode plate 521 for determining the moving distance of the second mover 32 in the X-axis direction is two, constituting two groups of X-axis direction detection units. Each group of X-axis direction detection units includes a first X-axis floating electrode plate, an X-axis emission electrode plate, a second X-axis floating electrode plate and an X-axis reception electrode plate. The two groups of X-axis direction detection units are symmetrically arranged with respect to the central axis of the lens 9 of the ball-type anti-shake motor.

[0045] In addition, the number of each electrode plate among the first Y-axis floating electrode plate 532, the Y-axis emission electrode plate 512, the second Y-axis floating electrode plate 542 and the Y-axis reception electrode plate 522 for determining the moving distance of the second mover 32 in the Y-axis direction is two, constituting two groups of Y-axis direction detection units. Each group of Y-axis direction detection units includes a first Y-axis floating electrode plate, a Y-axis emission electrode plate, a second Y-axis floating electrode plate and a Y-axis reception electrode plate. The two groups of Y-axis direction detection units are symmetrically arranged with respect to the central axis of the lens 9 of the ball-type anti-shake motor.

[0046] Since the two sets of X-axis direction detection units and the two sets of Y-axis direction detection units are both symmetrically arranged with respect to the center of the lens central axis, the changes in the capacitance values of the two sets of X-axis equivalent capacitances Cx1 and Cx2 formed in the two sets of X-axis direction detection units, and the changes in the capacitance values of the two sets of Y-axis equivalent capacitances Cy1 and Cy2 formed in the two sets of Y-axis direction detection units are similarly affected by the environment and human operation. Therefore, this type of noise's influence on the detection result can be eliminated through differential calculation. The capacitance after differential calculation in the X-axis direction is: Cx = (Cx1 - Cx2) / (Cx1 + Cx2). The capacitance after differential calculation in the Y-axis direction is: Cy = (Cy1 - Cy2) / (Cy1 + Cy2).

[0047] Taking the displacement detection in the X-axis direction as an example, as Figures 5 to 6 shown is the simulation test curve graph of the X-axis direction detection unit. Among them, Figure 5 is a schematic diagram of the changes in the capacitance values of the two sets of X-axis equivalent capacitances Cx1 and Cx2 within the range of ±200 μm of the X-axis direction displacement stroke. It can be seen from the figure that Cx1 and Cx2 show opposite change trends. Figure 6 is a schematic diagram of the corresponding relationship between the X-axis direction displacement and the differential capacitance signal Cx. It can be seen from the figure that within the range of ±100 microns of the X-axis direction displacement stroke, the differential capacitance signal Cx has good linearity, and for the stroke outside ±100 μm, linearity correction can also be achieved through subsequent compensation. Therefore, based on the differential capacitance signal of the X-axis, the detection of the X-axis direction displacement can be accurately realized. Similarly, for the differential capacitance signal of the Y-axis direction, the detection of the Y-axis direction displacement can also be accurately realized.

[0048] In addition, in order to control the detection process of the jitter direction displacement, in the corresponding capacitive position detection unit, only the distance parameter changes, and the facing area parameter does not change. It is necessary to control that during the movement of the second mover in the jitter direction, the orthographic projection of the first floating plate towards the first emitting plate always completely falls on the first emitting plate, and the orthographic projection of the second floating plate towards the first receiving plate always completely falls on the first receiving plate. Such a control method of parameter variables is beneficial to the linearity of the differential capacitance signal. When the jitter direction includes the X-axis direction and the Y-axis direction, and there are corresponding X-axis direction capacitive position detection units and Y-axis direction capacitive position detection units in the X-axis direction and the Y-axis direction respectively. In order to avoid the movement in the X-axis direction affecting the Y-axis direction capacitive position detection unit, and avoid the movement in the Y-axis direction affecting the X-axis direction capacitive position detection unit, it is necessary to consider the size relationship between the multiple plates constituting the same capacitance when designing the plates. Taking the sizes of the respective plates in the X-axis direction capacitive position detection unit as an example, the following is an explanation:

[0049] Assume that in the initial position of the ball screw anti-shake motor (the displacements in the X-axis, Y-axis, and Z-axis directions are all 0), the states of the X-axis emitting electrode plate 511, the X-axis receiving electrode plate 521, the first X-axis floating electrode plate 531, and the second X-axis floating electrode plate 541 are as Figure 7 shown. The distance between the upper edge of the first X-axis floating electrode plate 531 and the upper edge of the X-axis emitting electrode plate 511 is c1, the distance between the lower edge of the first X-axis floating electrode plate 531 and the lower edge of the X-axis emitting electrode plate 511 is c3, the distance between the upper edge of the second X-axis floating electrode plate 541 and the upper edge of the X-axis receiving electrode plate 521 is e1, and the distance between the lower edge of the second X-axis floating electrode plate 541 and the lower edge of the X-axis receiving electrode plate 521 is e3. Among them, both c1 and e1 are greater than the upward movement stroke of the first mover in the initial position, and both c3 and e3 are greater than the downward movement stroke of the first mover in the initial position. If the initial position is the middle position of the first mover's stroke, then both c1, e1, c3, and e3 are greater than 1 / 2 of the stroke of the first mover in the focusing direction. In addition, the distance between the left edge of the first X-axis floating electrode plate 531 and the left edge of the X-axis emitting electrode plate 511 is c2, the distance between the right edge of the first X-axis floating electrode plate 531 and the right edge of the X-axis emitting electrode plate 511 is c4, the distance between the left edge of the second X-axis floating electrode plate 541 and the left edge of the X-axis receiving electrode plate 521 is e4, and the distance between the right edge of the second X-axis floating electrode plate 541 and the right edge of the X-axis receiving electrode plate 521 is e2. Among them, both c2 and e4 are greater than the rightward movement stroke of the second mover in the initial position, and both c4 and e2 are greater than the rightward movement stroke of the second mover in the initial position. If the initial position is the middle position of the left-right movement stroke of the second mover, then both c2, e4, c4, and e2 are greater than 1 / 2 of the stroke of the second mover in the left-right direction. Figure 7 The up-down direction shown is the Z-axis direction, and the left-right direction is the Y-axis direction.

[0050] In addition, in order to ensure the signal quantity emitted by the X-axis emitting electrode plate 511, the facing area of the X-axis emitting electrode plate 511 and the first X-axis floating electrode plate 531 needs to be greater than the facing area of the X-axis receiving electrode plate 521 and the second X-axis floating electrode plate 541.

[0051] Similarly, regarding the size design of the Y-axis emitting electrode plate 512, the Y-axis receiving electrode plate 522, the first Y-axis floating electrode plate 532, and the second Y-axis floating electrode plate 542 in the Y-axis direction capacitive position detection unit, the influence of movement in different directions on the capacitive signal and the signal quantity of the Y-axis emitting electrode plate also need to be considered. The size design rules are similar and will not be elaborated here.

[0052] In addition, as Figure 3As shown in the figure, the ball-type anti-shake motor further includes: a second emitting electrode plate 61 and a second receiving electrode plate 62 disposed on the circuit board, and a third floating electrode plate 63 disposed on the first mover 31 and oppositely disposed to the second emitting electrode plate 61 and the second receiving electrode plate 62 in the shaking direction; when the first mover 31 moves in the focusing direction, the capacitance value generated by the capacitance formed by the second emitting electrode plate 61, the second receiving electrode plate 62, and the third floating electrode plate 63 determines the moving distance of the first mover 31 in the focusing direction.

[0053] As Figure 4 shown in the figure, the number of the second receiving electrode plates 62 can be two; the two second receiving electrode plates 62 are arranged in sequence in the focusing direction. When the first mover 31 moves in the focusing direction, the first change amount of the facing area between the third floating electrode plate 63 and one of the second receiving electrode plates 62 is equal to the second change amount of the facing area between the third floating electrode plate 63 and the other second receiving electrode plate 62; when the first mover 31 moves in the focusing direction, the facing area between the third floating electrode plate 63 and the second emitting electrode plate 61 does not change. The capacitance formed by the third floating electrode plate 63 and one of the second receiving electrode plates 62 and the capacitance formed by the third floating electrode plate 63 and the other second receiving electrode plate 62 are used for differential calculation to perform processing such as correcting or denoising the capacitance signal, eliminating the noise that affects the accuracy of the calculation result caused by environmental factors or human operation factors, etc., and simultaneously improving the sensitivity of the control of the lens position movement. The differential calculation method is similar to the differential calculation method in the previous shaking direction, and will not be repeated here.

[0054] In addition, in order to improve the accuracy of displacement detection, it is mentioned in the previous embodiment that two sets of X-axis detection units and two sets of Y-axis detection units can be provided. Each set of detection units is respectively disposed on the surfaces of the four sides of the motor. At the same time, the detection unit in the Z-axis direction can be arbitrarily set on the surface of one side of the motor. As Figures 3 to 4 shown in the figure, the detection unit in the Z-axis direction and one set of the detection units in the X-axis direction are jointly disposed on the surface of the same side of the motor. In order to reduce the occupation of the surface of the side of the motor, it can be considered to combine the emitting electrode plates of the X-axis detection unit and the Z-axis detection unit into one, that is, the first emitting electrode plate 51 and the second emitting electrode plate 61 are integrally formed as a common emitting electrode plate ( Figure 3 shown in the figure is the X-axis emitting electrode plate 511 and the second emitting electrode plate 61 integrally formed as a common emitting electrode plate); the first positive projection area of the first floating electrode plate facing the common emitting electrode plate and the second positive projection area of the third floating electrode plate facing the common emitting electrode plate do not overlap with each other. The common emitting electrode plate serves as the signal emitting end and can simultaneously emit the same electrical signal to the first floating electrode plate and the third floating electrode plate, and will not cause interference between the two sets of detection units.

[0055] As Figure 8As shown in the figure, it is a schematic diagram of the relevant parameters of the third floating plate 63, the second emitting plate 61, and the second receiving plate 62. During the movement of the first mover in the focusing direction, the facing area between the second emitting plate 61 and the third floating plate 63 always remains unchanged, and only the facing area between the second receiving plate 62 and the third floating plate 63 changes. At the same time, the distances between the third floating plate 63 and the second emitting plate 61 and the second receiving plate 62 respectively do not change. That is, only controlling the change of the facing area between the second receiving plate 62 and the third floating plate 63 affects the change of the capacitance signal. In order to ensure that during the movement in the focusing direction, the third floating plate 63, the second emitting plate 61, and the second receiving plate 62 can always maintain the above capacitance signal change rule, it is necessary to ensure that during the movement in the focusing direction, the upper edge of the third floating plate 63 never exceeds the upper edges of the second emitting plate 61 and one of the second receiving plates 62, and the lower edge of the third floating plate 63 never exceeds the lower edges of the second emitting plate 61 and the other second receiving plate 62. That is, a1 and b1 are greater than the upward movement stroke of the first mover at the initial position, where a1 represents the distance between the upper edge of the third floating plate 63 and the upper edge of the second emitting plate 61, and b1 represents the distance between the upper edge of the third floating plate 63 and the upper edge of one of the second receiving plates 62 arranged at a relatively upper position. a2 and b2 are greater than the downward movement stroke of the first mover at the initial position, where a2 represents the distance between the lower edge of the third floating plate 63 and the lower edge of the second emitting plate 61, and b1 represents the distance between the lower edge of the third floating plate 63 and the lower edge of the other second receiving plate 62 arranged at a relatively lower position. Figure 8 The up and down direction shown is the Z-axis direction.

[0056] In addition, as Figure 3 shown, the ball-type anti-shake motor includes a driving unit, which includes a first driving magnet 104 arranged on the first mover and a first driving coil 103 arranged on the base. The first driving magnet 104 and the first driving coil 103 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. 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 103 is fixed on the base 2 and cannot move, the Lorentz force is fed back to the first driving magnet 104. Due to the existence of the first ball, the carrier of the first driving magnet 104, the first mover 31, can move relative to the base, thereby realizing the driving of the first mover. By changing the current in the first driving coil 103, the magnitude of the Lorentz force can be controlled, and by changing the force on the first mover, the moving distance can be controlled.

[0057] 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 101 and a Y-axis driving coil 102, and the corresponding second driving magnets include: an X-axis driving magnet and a Y-axis driving magnet. The X-axis driving coil 101 and the X-axis driving magnet are disposed opposite to each other, and the Y-axis driving coil 102 and the Y-axis driving magnet are disposed opposite to each other. The first driving magnet, the first driving coil, the X-axis driving coil 101 and the X-axis driving magnet, and the Y-axis driving coil 102 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.

[0058] 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. In this setting mode, to ensure the stability of the motor structure, different electrode plates of the capacitive detection unit can be selected to be disposed on both sides of the driving unit. Taking the Y-axis detection unit as an example of the capacitive detection unit, as Figure 3As shown, the Y-axis emission electrode plate 512 and the first Y-axis floating electrode plate 532 can be arranged in the right region of the driving unit, and the Y-axis receiving electrode plate 522 and the second Y-axis floating electrode plate 542 can be arranged in the left region of the driving unit. In the two regions where the Y-axis emission electrode plate 512 and the first Y-axis floating electrode plate 532 face each other, and where the Y-axis receiving electrode plate 522 and the second Y-axis floating electrode plate 542 face each other, corresponding hollow regions are arranged on the first mover. The size of the hollow region is at least larger than the facing area of the Y-axis emission electrode plate 512 and the first Y-axis floating electrode plate 532 (the facing area of the Y-axis receiving electrode plate 522 and the second Y-axis floating electrode plate 542). Similarly, when the X-axis detection unit and the Z-axis detection unit are on the same side of the motor, the above setting method can also be referred to. The Z-axis detection unit can be arranged in the middle region of the side of the motor, and the X-axis detection unit can be arranged on both sides of the Z-axis detection unit respectively. When the X-axis detection unit or the Y-axis detection unit is separately arranged in the two side regions of the side of the motor, the first floating electrode plate and the second floating electrode plate are connected by a wire. If there is enough space on the second mover, the first floating electrode plate and the second floating electrode plate can also be integrally formed, as long as it is ensured that during the movement of the first mover and the second mover, the facing area between the integrally formed floating electrode plate and the first emission electrode plate does not change, and the facing area between the integrally formed floating electrode plate and the first receiving electrode plate does not change.

[0059] In addition, to ensure that the second mover is not driven by the first mover, so that the second mover only moves in the jitter direction and does not have a displacement change in the focusing direction, as Figure 1 shown, the ball-type anti-shake motor further includes: a gland 7 attached to the second mover 32; the gland 7 abuts against the second mover 32 in the focusing direction to limit the movement of the second mover 32 in the focusing direction.

[0060] In addition, as Figure 1 shown, the ball-type anti-shake motor further includes a housing 8 covering the periphery of all component structures, and the housing 8 plays a role in protecting the internal structure of the ball-type anti-shake motor.

[0061] In order to reduce the volume of the ball-type anti-shake motor, various internal components of the ball-type anti-shake motor can be overlapped in the focusing direction. For example, the second mover 32 is arranged 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, and the frame surrounds the outside of the second mover 32. Such a structure enables the second mover 32 to overlap at least partially with the first mover 31 in the focusing direction, which can reduce the thickness of the ball-type anti-shake motor in the focusing direction. Similarly, the base 2 overlaps at least partially with the first mover 31 in the focusing direction, which can also reduce the thickness of the ball-type anti-shake motor in the focusing direction. The circuit board 1 is arranged 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 arranged in 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.

[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 image acquisition and automatically calibrate the vibration of the external environment, thereby improving 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, and in practical applications, various changes can be made 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, and a base; 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; The first mover is disposed around the second mover, the circuit board is disposed around the first mover, and the circuit board is disposed on the side of the base; The second mover is provided with a first floating electrode plate and a second floating electrode plate that are electrically connected to each other. The circuit board is provided with a first emitting electrode plate disposed opposite to the first floating electrode plate, and a first receiving electrode plate disposed opposite to the second floating electrode plate. The first floating electrode plate and the first emitting electrode plate are disposed opposite to each other in the jitter direction, and the second floating electrode plate and the first receiving electrode plate are disposed opposite to each other in the jitter direction. The first emitting electrode plate and the first receiving electrode plate are disposed on the same side, and the first floating electrode plate and the second floating electrode plate are disposed on the same side; The first mover is provided with a hollowed-out area, and the hollowed-out area is at least in the position directly opposite to the first floating electrode plate and the first emitting electrode plate, and the position directly opposite to the second floating electrode plate and the first receiving electrode plate; The first floating electrode plate and the first emitting electrode plate form a first capacitor, and the second floating electrode plate and the first receiving electrode plate form a second capacitor. The moving distance of the second mover in the jitter direction is determined by the capacitance value generated by the series equivalent capacitance of the first capacitor and the second capacitor.

2. The ball-type anti-shake motor according to claim 1, 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 first emitting electrode plate includes: an X-axis emitting electrode plate and a Y-axis emitting electrode plate; The first receiving electrode plate includes: an X-axis receiving electrode plate and a Y-axis receiving electrode plate; The first floating electrode plate includes: a first X-axis floating electrode plate and a first Y-axis floating electrode plate, and the second floating electrode plate includes: a second X-axis floating electrode plate and a second Y-axis floating electrode plate; The first X-axis floating electrode plate and the second X-axis floating electrode plate are disposed on the first side surface of the second mover, the first Y-axis floating electrode plate and the second Y-axis floating electrode plate are disposed on the second side surface of the second mover, and the first side surface and the second side surface are adjacent surfaces; The first X-axis floating electrode plate and the X-axis emitting electrode plate are disposed opposite to each other in the X-axis direction, and the second X-axis floating electrode plate and the X-axis receiving electrode plate are disposed opposite to each other in the X-axis direction. The moving distance of the second mover in the X-axis direction is determined by the first X-axis floating electrode plate, the X-axis emitting electrode plate, the second X-axis floating electrode plate, and the X-axis receiving electrode plate; The first Y-axis floating plate and the Y-axis emitting plate are oppositely arranged in the Y-axis direction, and the second Y-axis floating plate and the Y-axis receiving plate are oppositely arranged in the Y-axis direction. The moving distance of the second mover in the Y-axis direction is determined by using the first Y-axis floating plate, the Y-axis emitting plate, the second Y-axis floating plate, and the Y-axis receiving plate.

3. The ball-type anti-shake motor according to claim 2, wherein The number of each of the first X-axis floating plate, the X-axis emitting plate, the second X-axis floating plate, and the X-axis receiving plate for determining the moving distance of the second mover in the X-axis direction is two, constituting two sets of X-axis direction detection units. Each set of the X-axis direction detection units includes one of the first X-axis floating plate, the X-axis emitting plate, the second X-axis floating plate, and the X-axis receiving plate. The two sets of the X-axis direction detection units are symmetrically arranged with respect to the lens central axis of the ball-type anti-shake motor. The number of each of the first Y-axis floating plate, the Y-axis emitting plate, the second Y-axis floating plate, and the Y-axis receiving plate for determining the moving distance of the second mover in the Y-axis direction is two, constituting two sets of Y-axis direction detection units. Each set of the Y-axis direction detection units includes one of the first Y-axis floating plate, the Y-axis emitting plate, the second Y-axis floating plate, and the Y-axis receiving plate. The two sets of the Y-axis direction detection units are symmetrically arranged with respect to the lens central axis of the ball-type anti-shake motor.

4. The ball-type anti-shake motor according to claim 1, wherein During the movement of the second mover in the jitter direction, the positive projection of the first floating plate toward the first emitting plate always completely falls on the first emitting plate, and the positive projection of the second floating plate toward the first receiving plate always completely falls on the first receiving plate.

5. The ball-type anti-shake motor according to claim 1, characterized in that It further includes: A second emitting plate and a second receiving plate provided on the circuit board, and a third floating plate provided on the first mover and oppositely arranged with the second emitting plate and the second receiving plate in the jitter direction; When the first mover moves along the focusing direction, the capacitance value generated by the capacitance formed by the second emitting plate, the second receiving plate, and the third floating plate determines the moving distance of the first mover in the focusing direction.

6. The ball-type anti-shake motor according to claim 5, wherein, The number of the second receiving plates is two; The two second receiving plates are arranged in sequence in the focusing direction. When the first mover moves along the focusing direction, the first change amount of the facing area between the third floating plate and one of the second receiving plates is equal to the second change amount of the facing area between the third floating plate and the other second receiving plate; When the first mover moves along the focusing direction, the facing area between the third floating plate and the second emitting plate does not change.

7. The ball-type anti-shake motor according to claim 5, wherein The first emitting plate and the second emitting plate are integrally formed as a common emitting plate; The first orthographic projection area of the first floating plate towards the common emission plate does not overlap with the second orthographic projection area of the third floating plate towards the common emission plate.

8. The ball-type anti-shake motor according to claim 1, wherein Further included are: A driving unit; The driving unit 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.

9. The ball-type anti-shake motor according to any one of claims 1 to 8, characterized in that, Further included are: A gland fitting the second mover; The gland abuts against the second mover in the focusing direction, and the gland restricts the movement of the second mover in the focusing direction.

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

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