Ball-type anti-shake motor and electronic device

Abstract

The present invention relates to the field of camera technology, and discloses a ball-type anti-shake motor and electronic equipment. In the present invention, the ball-type anti-shake motor includes: an emitter plate provided on a circuit board, a first floating plate opposite to the emitter plate provided on a first mover, and a second floating plate electrically connected to the first floating plate to realize electric field transmission with a third floating plate provided on the second mover, and then a fourth floating plate electrically connected to the third floating plate is used to form a capacitive detection unit for detecting displacement in the shaking direction with the first receiving plate on the circuit board. Through the electric field transmission effect between multiple floating plates, a capacitive detection unit is constructed when the second mover does not directly form a circuit connection with the circuit board. During detection, the facing area of the second floating plate and the third floating plate, and the distance between the fourth floating plate and the first receiving plate change at the same time, thereby improving the accuracy and sensitivity of detection.

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] Ball-type stabilization motors use electromagnetic force to drive balls to roll in grooves on a mover, which in turn drives the mover to move, effectively offsetting displacement caused by external vibrations, thereby achieving focus and optical image stabilization. Because ball-type stabilization motors require displacement in at least the focus and shake directions, they typically employ a nested design with a first and second mover to achieve movement in two or more directions.

[0003] Because the circuit board of a ball-bearing stabilization motor is typically designed around the periphery of the overall structure, it's difficult to establish a direct electrical connection between the second mover, located relatively inner within the nested structure, and the circuit board. Consequently, ball-bearing stabilization motors typically employ magnetic field displacement detection units to determine the movement of the second mover, or utilize multiple floating plates that don't require electrical connections to transmit electric fields, thus avoiding the need for direct displacement detection components on the second mover.

[0004] However, current ball-bearing stabilization motor displacement detection methods have at least the following drawbacks: The magnetic field-based displacement detection unit is susceptible to fluctuations in the ambient magnetic field, resulting in inaccurate detection results. Furthermore, the electric field transmitted by multiple floating plates reduces the capacitance of the resulting capacitor structure, thereby affecting 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 equipment, in which the movement distance of the second mover in the shaking direction is jointly determined by the capacitance formed by the second floating electrode and the third floating electrode, and the capacitance formed by the fourth floating electrode and the first receiving electrode. When detecting the movement distance, the facing area between the second floating electrode and the third floating electrode, and the distance between the fourth floating electrode and the first receiving electrode change at the same time, thereby improving the detection accuracy and sensitivity.

[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 and a base; the first mover uses the first ball to perform relative displacement with the base in the focusing direction; the second mover uses the second ball to perform relative displacement with the base in the shaking direction; wherein, the shaking direction is perpendicular to the focusing direction; the first mover is arranged on the periphery of the second mover, and the circuit board is arranged on the periphery of the first mover; the first mover includes a first side and a first bottom, and the second mover includes a second side and a second bottom; an emitter plate is provided on the circuit board, the first side is provided with a first floating plate opposite to the emitter plate, and the first bottom is provided with a first floating plate opposite to the first A second floating electrode is electrically connected to the floating electrode, a third floating electrode is provided on the second bottom and is opposite to the second floating electrode, a fourth floating electrode is provided on the second side and is electrically connected to the third floating electrode, and a first receiving electrode is provided on the circuit board and is opposite to the fourth floating electrode in the shaking direction; when the second mover moves in the shaking direction, the facing area between the second floating electrode and the third floating electrode changes, and the distance between the fourth floating electrode and the first receiving electrode changes; the moving distance of the second mover in the shaking direction is determined by using the capacitor jointly formed by the emitting electrode, the first floating electrode, the second floating electrode, the third floating electrode, the fourth floating electrode and the first receiving electrode.

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

[0008] Compared to related art, the present invention provides an emitter plate on a circuit board and a first floating plate on a first mover, opposing the emitter plate. A second floating plate electrically connected to the first floating plate enables electric field transfer to a third floating plate on the second mover. Furthermore, a fourth floating plate electrically connected to the third floating plate forms a capacitive detection unit for detecting displacement in the shaking direction using a first receiving plate on the circuit board. By utilizing the electric field transfer between the multiple floating plates, a capacitive detection unit is constructed to detect the movement of the second mover without a direct circuit connection between the second mover and the circuit board. This improves the accuracy of detection results compared to magnetic field detection units. Furthermore, when detecting movement distance, the facing area between the second and third floating plates, as well as the distance between the fourth floating plate and the first receiving plate, changes simultaneously. This improves detection sensitivity compared to capacitive detection units constructed with multiple floating plates, where only the facing area between a pair of opposing floating plates changes.

[0009] In addition, the jitter 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 second floating plate includes: a second X-axis floating plate and a second Y-axis floating plate, the third floating plate includes: a third X-axis floating plate and a third Y-axis floating plate, the fourth floating plate includes: a fourth X-axis floating plate and a fourth Y-axis floating plate; the first receiving plate includes: an X-axis receiving plate and a Y-axis receiving plate; the emitting plate, The first floating plate, the second X-axis floating plate, the third X-axis floating plate, the fourth X-axis floating plate and the X-axis receiving plate together constitute an X-axis direction detection unit, and the X-axis direction detection unit is used to detect the movement of the second mover in the X-axis direction; the emitter plate, the first floating plate, the second Y-axis floating plate, the third Y-axis floating plate, the fourth Y-axis floating plate and the Y-axis receiving plate together constitute a Y-axis direction detection unit, and the Y-axis direction detection unit is used to detect the movement of the second mover in the Y-axis direction.

[0010] In addition, the number of the second X-axis floating pad, the third X-axis floating pad, the fourth X-axis floating pad and the X-axis receiving pad in the X-axis direction detection unit is two, and the two fourth X-axis floating pads are respectively located at two second side portions opposite to each other, and the surface where the fourth X-axis floating pad is located is perpendicular to the X-axis direction; the number of the second Y-axis floating pad, the third Y-axis floating pad, the fourth Y-axis floating pad and the Y-axis receiving pad in the Y-axis direction detection unit is two, and the two fourth Y-axis floating pads are respectively located at two second side portions opposite to each other, and the surface where the fourth Y-axis floating pad is located is perpendicular to the Y-axis direction.

[0011] In addition, when the second mover moves in the shaking direction, the facing area between the second floating electrode and the third floating electrode decreases, while the distance between the fourth floating electrode and the first receiving electrode increases; or, when the second mover moves in the shaking direction, the facing area between the second floating electrode and the third floating electrode increases, while the distance between the fourth floating electrode and the first receiving electrode decreases.

[0012] In addition, when the second mover moves in the shaking direction, the facing area between the second floating electrode and the third floating electrode decreases, and the distance between the fourth floating electrode and the first receiving electrode decreases; or, when the second mover moves in the shaking direction, the facing area between the second floating electrode and the third floating electrode increases, and the distance between the fourth floating electrode and the first receiving electrode increases.

[0013] In addition, the ball-type anti-shake motor also includes: a second receiving electrode plate arranged on the same surface as the emitting electrode plate, and the second receiving electrode plate is arranged opposite to the first floating electrode plate; when the first mover moves along the focusing direction, the facing area between the first floating electrode plate and the second receiving electrode plate changes; the capacitance value generated by the capacitor formed by the emitting electrode plate, the second receiving electrode plate and the first floating electrode plate is used to determine the movement distance of the first mover in the focusing direction.

[0014] In addition, the number of second receiving plates is two; the two second receiving plates are arranged in sequence in the focusing direction, and when the first mover moves along the focusing direction, the first change in the facing area between the first floating plate and one of the second receiving plates is equal to the second change in the facing area between the first floating plate and the other second receiving plate; when the first mover moves along the focusing direction, the facing area between the first floating plate and the emitter plate does not change.

[0015] In addition, the third floating plate and the fourth floating plate are integrally formed to form a bent structure, and the third floating plate is perpendicular to the fourth floating plate.

[0016] In addition, the ball-type anti-shake motor also includes: a first driving unit; the first driving unit is used to drive the first mover to move in the focusing direction through magnetic field force; the ball-type anti-shake motor also includes: a magnetic field detection sensor; the magnetic field detection sensor is arranged adjacent to the first driving unit, and the magnetic field detection sensor is used to detect the magnetic field generated by the first driving unit, and determine the movement distance of the first mover in the focusing direction based on the detected magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1 Schematic diagram of the exploded structure of the ball-type anti-shake motor according to the embodiment of this solution;

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

[0020] Figure 3 1. It is a schematic diagram of relevant parameters of the vibration direction displacement detection structure of the ball-type anti-shake motor according to the embodiment of this solution;

[0021] Figure 4 This is a schematic structural diagram of the first floating plate and the second floating plate of the ball-type anti-shake motor according to an embodiment of the present solution;

[0022] Figure 5 1 is a schematic structural diagram of the third floating plate and the fourth floating plate of the ball-type anti-shake motor according to an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of a partial three-dimensional structure of a ball-type anti-shake motor according to an embodiment of this solution;

[0024] Figure 7 1 is a schematic diagram of a top view of the Z-axis direction of the ball-type anti-shake motor according to an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the corresponding relationship between the anti-shake direction displacement and the capacitance signal in the ball-type anti-shake motor according to an embodiment of the present solution;

[0026] Figure 9 This is a schematic diagram of the corresponding relationship between the anti-shake direction displacement and the differential capacitance signal in the ball-type anti-shake motor according to an embodiment of this solution;

[0027] Figure 10 1 is a schematic diagram of the three-dimensional structure of a ball-type anti-shake motor according to an embodiment of the present invention;

[0028] Figure 11 2. This is a schematic diagram of parameters related to the emitter plate, the first floating plate, and the second receiving plate in the ball-type anti-shake motor according to an embodiment of the present invention;

[0029] Figure 12 This is a schematic diagram of parameters related to the second floating plate, the third floating plate, and the first receiving plate in the ball-type anti-shake motor according to an embodiment of the present invention;

[0030] Figure 13 This is a schematic diagram of parameters related to the fourth floating plate and the first receiving plate in the ball-type anti-shake motor according to an embodiment of the present invention;

[0031] Figure 14 1 is a schematic structural diagram of a third floating plate and a fourth floating plate of a ball-type anti-shake motor according to another embodiment of the present invention;

[0032] Figure 15 is a partial three-dimensional structural diagram of a ball-type anti-shake motor according to another embodiment of the present invention;

[0033] Figure 16 1 is a schematic diagram of a top view of the Z-axis direction of a ball-type anti-shake motor according to another embodiment of the present invention;

[0034] Figure 17 This is a schematic diagram of the corresponding relationship between the anti-shake direction displacement and the capacitance signal in a ball-type anti-shake motor according to another embodiment of the present solution;

[0035] Figure 18 Schematic diagram of the corresponding relationship between the anti-shake direction displacement and the differential capacitance signal in a ball-type anti-shake motor according to another embodiment of the present solution;

[0036] Figure 19 This is a schematic diagram of parameters related to the second floating plate, the third floating plate, the fourth floating plate, and the first receiving plate in a ball-type anti-shake motor according to another embodiment of the present solution;

[0037] Figure 20 It is a schematic diagram of the three-dimensional structure of a ball-type anti-shake motor in another embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1- Circuit board;

[0040] 2- base;

[0041] 31-first mover; 32-second mover;

[0042] 41-first ball; 42-second ball;

[0043] 50 - emitter plate; 51 - first floating plate; 52 - second floating plate; 53 - third floating plate; 54 - fourth floating plate; 55 - first receiving plate; 521 - second X-axis floating plate; 522 - second Y-axis floating plate; 531 - third X-axis floating plate; 532 - third Y-axis floating plate; 541 - fourth X-axis floating plate; 542 - fourth Y-axis floating plate; 551 - X-axis receiving plate; 552 - Y-axis receiving plate;

[0044] 60-second receiving plate; 61-magnetic field detection sensor;

[0045] 7- gland;

[0046] 8-housing;

[0047] 9-lens;

[0048] 101-First driving coil. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in the various embodiments of the present invention to facilitate a better understanding of the present invention. However, even without these technical details and the various variations and modifications based on the following embodiments, the technical solutions claimed in the present invention can still be implemented.

[0050] The following embodiments are divided for the convenience of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined with each other and referenced to each other under the premise of no contradiction.

[0051] The 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 and a second ball 42; the first mover 31 uses the first ball 41 to move relative to the base 2 in the focus direction; the second mover 32 uses the second ball 42 to move relative to the base 2 in the shake direction; wherein the shake direction is perpendicular to the focus direction; the first mover 31 is arranged on the periphery of the second mover 32, and the circuit board 1 is arranged on the periphery of the first mover 31; the first mover 31 includes a first side portion and a first bottom portion, and the second mover 32 includes a second side portion and a second bottom portion. Figure 2 As shown, an emitter plate 50 is provided on the circuit board 1, a first floating plate 51 is provided on the first side and is opposite to the emitter plate 50, a second floating plate 52 is provided on the first bottom and is electrically connected to the first floating plate 51, a third floating plate 53 is provided on the second bottom and is opposite to the second floating plate 52, a fourth floating plate 54 is provided on the second side and is electrically connected to the third floating plate 53, and a first receiving plate 55 is provided on the circuit board 1 and is opposite to the fourth floating plate 54 in the shaking direction; when the second mover 32 moves in the shaking direction, the facing area between the second floating plate 52 and the third floating plate 53 changes, and the distance between the fourth floating plate 54 and the first receiving plate 55 changes; the moving distance of the second mover 32 in the shaking direction is determined by the capacitance jointly formed by the emitter plate 50, the first floating plate 51, the second floating plate 52, the third floating plate 53, the fourth floating plate 54 and the first receiving plate 55.

[0052] Compared to related art, the present invention provides an emitter plate on a circuit board and a first floating plate on a first mover, opposing the emitter plate. A second floating plate electrically connected to the first floating plate enables electric field transfer to a third floating plate on the second mover. Furthermore, a fourth floating plate electrically connected to the third floating plate forms a capacitive detection unit for detecting displacement in the shaking direction using a first receiving plate on the circuit board. By utilizing the electric field transfer between the multiple floating plates, a capacitive detection unit is constructed to detect the movement of the second mover without a direct circuit connection between the second mover and the circuit board. This improves the accuracy of detection results compared to magnetic field detection units. Furthermore, when detecting movement distance, the facing area between the second and third floating plates, as well as the distance between the fourth floating plate and the first receiving plate, changes simultaneously. This improves detection sensitivity compared to capacitive detection units constructed with multiple floating plates, where only the facing area between a pair of opposing floating plates changes.

[0053] like Figure 2 As shown, a vibration direction displacement detection unit is formed by an emitter plate 50, a first floating plate 51, a second floating plate 52, a third floating plate 53, a fourth floating plate 54, and a first receiving plate 55. The emitter plate 50 is connected to the chip IC's transmit signal terminal, and the first receiving plate 55 is connected to the IC's receive signal terminal. The emitter plate 50 and the first receiving plate 55 achieve a capacitive effect through the electrically connected first floating plate 51 and second floating plate 52, the electrically connected third floating plate 53 and fourth floating plate 54, and the opposing second floating plate 52 and third floating plate 53, creating a bridging connection.

[0054] The capacitor formed by the emitter plate 50, the first floating plate 51, the second floating plate 52, the third floating plate 53, the fourth floating plate 54 and the first receiving plate 55 can be regarded as the first capacitor formed by the emitter plate 50 and the first floating plate 51. The second capacitor formed by the second floating plate 52 and the third floating plate 53 , and the third capacitor formed by the fourth floating plate 54 and the first receiving plate 55 Phase in series. Figure 3 As shown, it is assumed that the facing area between the emitter plate 50 and the first floating plate 51 is , the distance is , the first capacitor is The facing area between the second floating plate 52 and the third floating plate 53 is , the distance is , the second capacitor is The area between the fourth floating plate 54 and the first receiving plate 55 is , the distance is , the third capacitor is The equivalent capacitance of the first capacitor, the second capacitor and the third capacitor in series is C= ,in, represents pi, ε represents the dielectric constant of the medium, which is determined by the medium between the plates, such as air, water, etc.; k represents the electrostatic force constant, also known as the Coulomb constant, which means that when two point charges with a charge of 1C in a vacuum are 1 meter apart, the force between them is 8.987551× N, that is, k=8.987551× N·m² / C. Therefore, when the facing area between the second floating plate 52 and the third floating plate 53, and the distance between the fourth floating plate 54 and the first receiving plate 55 change simultaneously, the equivalent capacitance in series is and The change causes the series equivalent capacitance value to change. According to the change of the capacitance value, the moving direction and moving distance of the second mover 32 in the shaking direction can be calculated.

[0055] When the second mover moves in the shaking direction, the change in the series equivalent capacitance will be different based on the different relative positions of the second floating plate 52 and the third floating plate 53. The following is an explanation based on the different relative positions of the second floating plate 52 and the third floating plate 53:

[0056] One embodiment is as follows: when the second mover 32 moves in the shaking direction, the facing area between the second floating plate 52 and the third floating plate 53 At the same time, the distance between the fourth floating plate 54 and the first receiving plate 55 is reduced. or, when the second mover 32 moves in the shaking direction, the area between the second floating plate 52 and the third floating plate 53 is opposite As the distance between the fourth floating plate 54 and the first receiving plate 55 increases, In this case, due to Reduce and Increasing will reduce the value of the series equivalent capacitance C. Increase and The reduction will reduce the value of the series equivalent capacitance C, so by and The simultaneous change of can increase the impact on the change value of the series equivalent capacitance, thereby improving the sensitivity of the detection results.

[0057] like Figure 4 Figure 2 shows the arrangement of the various plates on the first mover in this embodiment. A first floating plate 51 is disposed on the first side of the first mover, and a second floating plate 52, electrically connected to the first floating plate 51, is disposed on the first bottom portion of the first mover. The number of second floating plates 52 can be adjusted as needed. If the second floating plates 52 are adjacent to the first floating plates 51, the first and second floating plates 51, 52 can be directly connected to achieve electrical connection. If the second floating plates 52 are far from the first floating plates 51, the second floating plates 52 and 51 can be connected via wires, with the wires being aligned with the first bottom portion for wiring.

[0058] like Figure 5 As shown, the arrangement of the various electrodes on the second mover in this embodiment is shown. The third floating electrode 53 is arranged at the second bottom of the second mover, and the fourth floating electrode 54 electrically connected to the third floating electrode 53 is arranged on the second side of the second mover. Since the third floating electrode 53 and the fourth floating electrode 54 need to be spaced apart in the shaking direction in this embodiment, the two are connected by a wire.

[0059] In addition, if Figure 6 As shown, the shaking direction includes the X-axis direction and the Y-axis direction, wherein 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 second floating electrode 52 includes: a second X-axis floating electrode 521 and a second Y-axis floating electrode 522, the third floating electrode 53 includes: a third X-axis floating electrode 531 and a third Y-axis floating electrode 532, the fourth floating electrode 54 includes: a fourth X-axis floating electrode 541 and a fourth Y-axis floating electrode 542; the first receiving electrode 55 includes: an X-axis receiving electrode 551 and a Y-axis receiving electrode 552; The emitter plate 50, the first floating plate 51, the second X-axis floating plate 521, the third X-axis floating plate 531, the fourth X-axis floating plate 541 and the X-axis receiving plate 551 together constitute an X-axis direction detection unit, which is used to detect the movement of the second mover 32 in the X-axis direction; the emitter plate 50, the first floating plate 51, the second Y-axis floating plate 522, the third Y-axis floating plate 532, the fourth Y-axis floating plate 542 and the Y-axis receiving plate 552 together constitute a Y-axis direction detection unit, which is used to detect the movement of the second mover 32 in the Y-axis direction.

[0060] In addition, if Figure 7 As shown, it is a top view of the motor in the Z-axis direction. Figure 7It can be seen that the number of the second X-axis floating plate 521, the third X-axis floating plate 531, the fourth X-axis floating plate 541 and the X-axis receiving plate 551 used to determine the moving distance of the second mover 32 in the X-axis direction is two, and the two fourth X-axis floating plates 541 are respectively located at two second side portions opposite to each other, and the surface where the fourth X-axis floating plates 541 are located is perpendicular to the X-axis direction; the number of the second Y-axis floating plate 522, the third Y-axis floating plate 532, the fourth Y-axis floating plate 542 and the Y-axis receiving plate 552 in the Y-axis direction detection unit is two, and the two fourth Y-axis floating plates 542 are respectively located at two second side portions opposite to each other, and the surface where the fourth Y-axis floating plate 542 is located is perpendicular to the Y-axis direction.

[0061] Because the two sets of X-axis detection units and the two sets of Y-axis detection units are symmetrically arranged with respect to the central axis of the lens, the capacitance changes of the two sets of X-axis equivalent capacitors Cx1 and Cx2 formed by the two sets of X-axis detection units, as well as the capacitance changes of the two sets of Y-axis equivalent capacitors Cy1 and Cy2 formed by the two sets of Y-axis detection units, are similarly affected by environmental and human factors. Therefore, the impact of such noise on the detection results can be eliminated through differential calculation. The differential capacitance in the X-axis direction is: Cx = (Cx1-Cx2) / (Cx1+Cx2). The differential capacitance in the Y-axis direction is: Cy = (Cy1-Cy2) / (Cy1+Cy2).

[0062] Take the displacement detection in the X-axis direction as an example, Figures 8 and 9 The figure shows the simulation test curve of the X-axis direction detection unit, where: Figure 8 Schematic diagram of the capacitance change of two sets of X-axis equivalent capacitors Cx1 and Cx2 within the range of ±250μm in the X-axis direction. Figure 8 It can be seen that Cx1 and Cx2 show opposite changing trends. Figure 9 The diagram is a schematic diagram of the corresponding relationship between the X-axis displacement and the differential capacitance signal Cx1-Cx2, Figure 9 It can be seen that within the X-axis displacement range of ±125 μm, the differential capacitance signal Cx1-Cx2 has good linearity. Beyond the ±125 μm range, linearity correction can be achieved through subsequent compensation. Therefore, the X-axis differential capacitance signal can accurately detect X-axis displacement. Similarly, the Y-axis differential capacitance signal can also accurately detect Y-axis displacement.

[0063] In addition, if Figure 10As shown, the ball-type anti-shake motor also includes: a second receiving plate 60 arranged on the same surface as the emitter plate 50, and the second receiving plate 60 is arranged opposite to the first floating plate 51; when the first mover 31 moves along the focusing direction, the facing area between the first floating plate 51 and the second receiving plate 60 changes; the capacitance value generated by the capacitor formed by the emitter plate 50, the second receiving plate 60 and the first floating plate 51 is used to determine the moving distance of the first mover 31 in the focusing direction.

[0064] The number of second receiving plates 60 can be two; the two second receiving plates 60 are arranged sequentially in the focusing direction. When the first mover 31 moves in the focusing direction, the first change in the area facing each other between the first floating plate 51 and one of the second receiving plates 60 is equal to the second change in the area facing each other between the first floating plate 51 and the other second receiving plate 60. When the first mover 31 moves in the focusing direction, the area facing each other between the first floating plate 51 and the emitter plate 50 does not change. A differential calculation is performed using the capacitance formed between the first floating plate 51 and one of the second receiving plates 60 and the capacitance formed between the first floating plate 51 and the other second receiving plate 60 to correct or denoise the capacitance signal, thereby eliminating noise that may affect the accuracy of the calculation results due to environmental factors or human operation factors, and improving the sensitivity of the lens position movement control. The differential calculation method is similar to the differential calculation method for the previous jitter direction and will not be repeated here.

[0065] The following is a detailed description of the size parameters between the electrodes in the focus direction detection unit and the shake direction detection unit:

[0066] Assuming that the ball-type anti-shake motor is in the initial position (the displacement in the X-axis, Y-axis and Z-axis directions are all 0), the states of the emitter plate 50, the two second receiving plates 60 and the first floating plate 51 are as follows: Figure 11 As shown, the distance between the upper edge of the first floating plate 51 and the upper edge of the emitter plate 50 is a1, the distance between the lower edge of the first floating plate 51 and the lower edge of the emitter plate 50 is a2, the distance between the upper edge of the first floating plate 51 and the upper edge of one of the second receiving plates 60 located at the upper position is b1, and the distance between the lower edge of the first floating plate 51 and the lower edge of the other second receiving plate 60 located at the lower position is b2. Here, a1 and b1 are both greater than the upward travel of the first mover in the initial position, and a2 and b2 are both greater than the downward travel of the first mover in the initial position. If the initial position is the middle of the first mover's travel, then a1, b1, a2, and b2 are all greater than 1 / 2 of the travel of the first mover in the focusing direction. Figure 11 The up and down direction shown is the Z-axis direction.

[0067] The states of the second floating plate 52, the third floating plate 53 and the first receiving plate 55 are as follows: Figure 12 As shown, the distance between the second floating electrode 52 and the first receiving electrode plate 55 is smaller than the distance between the third floating electrode plate 53 and the first receiving electrode plate 55. This arrangement can ensure that when the second mover moves toward the first receiving electrode plate 55, the facing area between the second floating electrode plate 52 and the third floating electrode plate 53 increases, and when the second mover moves away from the first receiving electrode plate 55, the facing area between the second floating electrode plate 52 and the third floating electrode plate 53 decreases. The distance between the upper edge of the second floating electrode 52 and the upper edge of the third floating electrode 53 is c1, the distance between the right edge of the second floating electrode 52 and the right edge of the third floating electrode 53 is c2, the distance between the lower edge of the second floating electrode 52 and the upper edge of the third floating electrode 53 is c3, and the distance between the left edge of the second floating electrode 52 and the left edge of the third floating electrode 53 is c4, wherein c1 is greater than the upward stroke of the second mover, c2 is greater than the rightward stroke of the second mover, c3 is greater than the downward stroke of the second mover, and c4 is greater than the leftward stroke of the second mover, so as to eliminate crosstalk caused by the second mover moving in different directions. Figure 12 If the up-down direction is the X-axis direction, the left-right direction is the Y-axis direction. Figure 12 If the up and down direction is the Y-axis direction, the left and right direction is the X-axis direction. Figure 13 As shown, the distance between the upper edge of the fourth floating plate 54 and the upper edge of the first receiving plate 55 is e1, the distance between the right edge of the fourth floating plate 54 and the right edge of the first receiving plate 55 is e2, the distance between the lower edge of the fourth floating plate 54 and the lower edge of the first receiving plate 55 is e3, and the distance between the left edge of the fourth floating plate 54 and the left edge of the first receiving plate 55 is e4. Here, e2 is greater than the rightward travel of the second mover, e4 is greater than the leftward travel of the second mover, and e1 and e3 are greater than zero. This eliminates crosstalk caused by the second mover moving in different directions. Figure 13 If the up-down direction is the Z-axis direction, the left-right direction is the X-axis direction or the Y-axis direction.

[0068] In addition, in order to ensure the signal quantity emitted by the emitter plate 50 , the facing area between the emitter plate 50 and the first floating plate 51 needs to be large enough.

[0069] Another embodiment of the relative position of the second floating plate 52 and the third floating plate 53 is as follows: when the second mover moves in the shaking direction, the facing area between the second floating plate and the third floating plate is At the same time, the distance between the fourth floating plate and the first receiving plate is reduced. or, when the second mover moves in the shaking direction, the area between the second floating plate and the third floating plate is As the distance between the fourth floating plate and the first receiving plate increases, Increase.

[0070] because The impact on the value of the series equivalent capacitance C is greater than The impact on the value of the series equivalent capacitance C, therefore, and When the synchronous decreases, the value of the series equivalent capacitance C increases. and When the synchronization increases, the value of the series equivalent capacitance C decreases.

[0071] and The numerical influence on the series equivalent capacitance C is derived as follows:

[0072] For the series equivalent capacitance C The derivative is,

[0073] ; The derivative formula is negative, which means that as As C decreases, the absolute value of the derivative decreases. Inversely proportional, when When the value is very small, the absolute value of the derivative is very large, and the capacitance Very sensitive to changes.

[0074] For the series equivalent capacitance C The derivative is,

[0075] ; The derivative formula is positive, which means that as As C increases, the derivative is inversely proportional to the square of S2. When the value is very small, the derivative is large, and the capacitance However, since the derivative is inversely proportional to the square of S2, its sensitivity is not as good as that to the distance sensitive to changes.

[0076] This setting can be done by Compensate for the effect of the series equivalent capacitance C The excessively fast influence on the series equivalent capacitance C can improve the linearity of the series equivalent capacitance C.

[0077] like Figure 14As shown in FIG. 1 , the relative position relationship between the third floating plate 53 and the fourth floating plate 54 in this embodiment is shown. The third floating plate 53 and the fourth floating plate 54 are integrally formed to form a bent structure, and the third floating plate 53 and the fourth floating plate 54 are perpendicular to each other.

[0078] like Figure 15 is a structural diagram of the positional relationship between the various plates in this embodiment, Figure 16 The figure shows a top view of the motor in the Z-axis direction. In this embodiment, when the shaking direction includes the X-axis direction and the Y-axis direction, the second floating plate 52 also includes a second X-axis floating plate 521 and a second Y-axis floating plate 522. The third floating plate 53 includes: a third X-axis floating plate 531 and a third Y-axis floating plate 532. The fourth floating plate 54 includes: a fourth X-axis floating plate 541 and a fourth Y-axis floating plate 542. The first receiving plate 55 includes: an X-axis receiving plate 551 and a Y-axis receiving plate 552. The emitter plate 50, the first floating plate The electrode plate 51, the second X-axis floating electrode plate 521, the third X-axis floating electrode plate 531, the fourth X-axis floating electrode plate 541 and the X-axis receiving electrode plate 551 together constitute an X-axis direction detection unit, which is used to detect the movement of the second mover 32 in the X-axis direction; the emitter plate 50, the first floating electrode plate 51, the second Y-axis floating electrode plate 522, the third Y-axis floating electrode plate 532, the fourth Y-axis floating electrode plate 542 and the Y-axis receiving electrode plate 552 together constitute a Y-axis direction detection unit, which is used to detect the movement of the second mover 32 in the Y-axis direction.

[0079] Similarly, in this embodiment, the number of the second X-axis floating pad 521, the third X-axis floating pad 531, the fourth X-axis floating pad 541, and the X-axis receiving pad 551 used to determine the movement distance of the second mover 32 in the X-axis direction can each be two, and the number of the second Y-axis floating pad 522, the third Y-axis floating pad 532, the fourth Y-axis floating pad 542, and the Y-axis receiving pad 552 in the Y-axis direction detection unit can each be two. This facilitates differential calculation and noise elimination.

[0080] like Figures 17 and 18 The figure shows the simulation test curve of the X-axis direction detection unit, where: Figure 17 For the X-axis displacement range of ±250μm, two sets of X-axis equivalent capacitance x1 and Schematic diagram of the change of capacitance value of x2. It can be seen from the figure that x1 and x2 shows an opposite trend of change. Figure 18 is the X-axis displacement and differential capacitance signal x1- Schematic diagram of the corresponding relationship between x2, through The reverse compensation shows good linearity within ±250μm.

[0081] Regarding the focus direction detection of the motor structure in this embodiment, its detection structure is consistent with the focus direction detection structure in the previous embodiment, including: a second receiving plate 60 arranged on the same surface as the emitter plate 50, and the second receiving plate 60 is arranged opposite the first floating plate 51; when the first mover 31 moves in the focus direction, the area facing each other between the first floating plate 51 and the second receiving plate 60 changes; the capacitance value generated by the capacitor formed by the emitter plate 50, the second receiving plate 60, and the first floating plate 51 is used to determine the movement distance of the first mover 31 in the focus direction. The specific details of the focus direction detection structure refer to the previous embodiment and are not repeated here to avoid repetition.

[0082] The following is a detailed description of the size parameters between the plates in the vibration direction detection unit in this embodiment:

[0083] Assuming that the ball-type anti-shake motor is in the initial position (the displacement in the X-axis, Y-axis and Z-axis directions are all 0), the states of the second floating electrode 52, the third floating electrode 53, the fourth floating electrode 54 and the first receiving electrode 55 are as follows: Figure 19 As shown, the distance between the second floating electrode 52 and the first receiving electrode plate 55 is greater than the distance between the third floating electrode plate 53 and the first receiving electrode plate 55. This arrangement can ensure that when the second mover moves toward the first receiving electrode plate 55, the facing area between the second floating electrode plate 52 and the third floating electrode plate 53 decreases, and when the second mover moves away from the first receiving electrode plate 55, the facing area between the second floating electrode plate 52 and the third floating electrode plate 53 increases. The distance between the upper edge of the second floating electrode 52 and the upper edge of the third floating electrode 53 is f1, the distance between the right edge of the second floating electrode 52 and the right edge of the third floating electrode 53 is f2, the distance between the lower edge of the second floating electrode 52 and the upper edge of the third floating electrode 53 is f3, and the distance between the left edge of the second floating electrode 52 and the left edge of the third floating electrode 53 is f4, wherein f1 is greater than the upward stroke of the second mover, f2 is greater than the rightward stroke of the second mover, f3 is greater than the downward stroke of the second mover, and f4 is greater than the leftward stroke of the second mover, so as to eliminate crosstalk caused by the second mover moving in different directions. Figure 19 If the up-down direction is the X-axis direction, the left-right direction is the Y-axis direction. Figure 19 If the up-down direction is the Y-axis direction, the left-right direction is the X-axis direction.

[0084] In addition, the ball-bearing anti-shake motor includes a drive unit, including a first drive magnet arranged on the first mover, and a first drive coil arranged on the base. The first drive magnet and the first drive coil are arranged relative to each other and are used to drive the first mover to move in the focusing direction. The first drive magnet forms a fixed magnetic field. The first drive coil is connected to the circuit board and is powered and controlled by the external circuit and IC. When the first drive coil is energized, it generates an induced magnetic field, which interacts with the fixed magnetic field formed by the first drive magnet to generate a Lorentz force. Since the first drive coil is fixed to the base 2 and cannot move, the Lorentz force is fed back to the first drive magnet. Due to the presence of the first ball, the first mover 31, the carrier of the first drive magnet, can move relative to the base, thereby realizing the drive of the first mover. By changing the current in the first drive coil, the magnitude of the Lorentz force can be controlled, and the force applied to the first mover can be changed to control the distance of movement.

[0085] 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. The second drive magnet and the second drive coil are arranged opposite to each other, and are 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 and the X-axis drive magnet are arranged opposite to each other, and the Y-axis drive coil and the Y-axis drive magnet are arranged opposite to each other. 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 fields and affect the driving effect of the motor.

[0086] In order to ensure the driving effect of the drive unit, the drive unit is usually placed in the middle area of the motor side. As mentioned above, the capacitive detection unit is also placed on the side of the motor. In order to ensure the driving effect of the motor, the capacitive detection unit can be placed in a circumvented position. That is, the capacitive detection unit is placed on the same side of the motor as the drive unit, and the middle area is used as the location of the drive unit.

[0087] In addition, in order to avoid crosstalk between the movement in the focus direction and the movement in the shake direction, the displacement detection structure in the focus direction can also be adjusted to a magnetic field detection unit, that is, the ball-type anti-shake motor also includes: a magnetic field detection sensor; the magnetic field detection sensor is arranged adjacent to the first drive unit, and the magnetic field detection sensor is used to detect the magnetic field generated by the first drive unit, and determine the movement distance of the first mover in the focus direction based on the detected magnetic field. Figure 20As shown, a magnetic field detection sensor 61 is disposed within the area surrounding the first drive coil 101 of the first drive unit. This magnetic field detection sensor 61 is fixed to a circuit board and detects changes in the magnetic field of the first drive magnet. This magnetic field detection sensor 61 can be a Hall or TMR sensor. Position detection in the focus direction and the jitter direction is performed using different types of detection units, respectively. The two types of detection units do not interfere with each other, thereby improving the accuracy of the detection results to a certain extent.

[0088] In addition, if Figure 1 As shown, the ball-type anti-shake motor also includes a pressure cap 7 that fits over the second mover 32. The pressure cap 7 abuts the second mover 32 in the focus direction, limiting its movement in that direction. That is, movement of the first mover in the focus direction can drive the second mover to move in the same direction, but the second mover itself can only move in the shake direction. The pressure cap restricts the second mover from moving in the focus direction, and movement of the second mover in the shake direction does not drive movement of the first mover.

[0089] In addition, if Figure 1 As shown, the ball-type anti-shake motor further includes a shell 8 covering the periphery of all component structures. The shell 8 protects the internal structure of the ball-type anti-shake motor.

[0090] To reduce the size of the ball-bearing stabilization motor, its internal components can overlap in the focus direction. For example, the second mover 32 is positioned inside the first mover 31. Specifically, the first mover 31 is a hollow frame structure with a central area for accommodating the lens. The frame surrounds the outer side of the second mover 32. This structure allows the second mover 32 to at least partially overlap with the first mover 31 in the focus direction, thus reducing the thickness of the ball-bearing stabilization motor in this direction. Similarly, the base 2 is designed to at least partially overlap with the first mover 31 in the focus direction, similarly reducing the thickness of the ball-bearing stabilization motor in this direction. A circuit board 1 is positioned on the side of the base 2 to facilitate electrical connection between the first and second detection units within the ball-bearing stabilization motor. The circuit board 1 can be a flexible printed circuit (FPC), which allows for easier conformity to the outer surface of the base. A space is reserved in the central area of the ball-bearing stabilization motor for mounting the lens 9.

[0091] Another possible embodiment of the present invention relates to an electronic device including the aforementioned ball-bearing anti-shake motor. The ball-bearing anti-shake motor is used in conjunction with a lens to capture images and automatically calibrate for external environmental vibrations, thereby improving image capture quality.

[0092] 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 described in detail here.

[0093] 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 thereto 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 rolling ball, a second rolling ball, a circuit board and a base; The first mover uses the first ball to move relative to the base in the focusing direction; The second mover utilizes the second ball to generate relative displacement with the base in a shaking direction; wherein the shaking direction is perpendicular to the focusing direction; The first mover is arranged on the periphery of the second mover, and the circuit board is arranged on the periphery of the first mover; The first mover includes a first side portion and a first bottom portion, and the second mover includes a second side portion and a second bottom portion; The circuit board is provided with an emitter plate, the first side is provided with a first floating plate opposite to the emitter plate, the first bottom is provided with a second floating plate electrically connected to the first floating plate, the second bottom is provided with a third floating plate opposite to the second floating plate, the second side is provided with a fourth floating plate electrically connected to the third floating plate, and the circuit board is provided with a first receiving plate opposite to the fourth floating plate in the shaking direction; When the second mover moves in the shaking direction, the facing area between the second floating plate and the third floating plate changes, and the distance between the fourth floating plate and the first receiving plate changes. The moving distance of the second mover in the shaking direction is determined by using the capacitance formed by the emitter plate, the first floating plate, the second floating plate, the third floating plate, the fourth floating plate and the first receiving plate.

2. The ball-type anti-shake motor according to claim 1, characterized in that: When the second mover moves in the shaking direction, the facing area between the second floating plate and the third floating plate decreases, while the distance between the fourth floating plate and the first receiving plate increases; Alternatively, when the second mover moves in the shaking direction, the facing area between the second floating plate and the third floating plate increases, while the distance between the fourth floating plate and the first receiving plate decreases.

3. The ball-type anti-shake motor according to claim 1, characterized in that: When the second mover moves in the shaking direction, the facing area between the second floating plate and the third floating plate decreases, and the distance between the fourth floating plate and the first receiving plate decreases; Alternatively, when the second mover moves in the shaking direction, the facing area between the second floating plate and the third floating plate increases, and at the same time, the distance between the fourth floating plate and the first receiving plate increases.

4. The ball-type anti-shake motor according to claim 1, 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 second floating plate includes: a second X-axis floating plate and a second Y-axis floating plate, the third floating plate includes: a third X-axis floating plate and a third Y-axis floating plate, and the fourth floating plate includes: a fourth X-axis floating plate and a fourth Y-axis floating plate; The first receiving plate includes: an X-axis receiving plate and a Y-axis receiving plate; The emitter plate, the first floating plate, the second X-axis floating plate, the third X-axis floating plate, the fourth X-axis floating plate and the X-axis receiving plate together constitute an X-axis direction detection unit, and the X-axis direction detection unit is used to detect the movement of the second mover in the X-axis direction; The emitter plate, the first floating plate, the second Y-axis floating plate, the third Y-axis floating plate, the fourth Y-axis floating plate and the Y-axis receiving plate together constitute a Y-axis direction detection unit, which is used to detect the movement of the second mover in the Y-axis direction.

5. The ball-type anti-shake motor according to claim 4, characterized in that: The number of the second X-axis floating plate, the third X-axis floating plate, the fourth X-axis floating plate, and the X-axis receiving plate in the X-axis direction detection unit is two each, the two fourth X-axis floating plates are respectively located at two second side portions opposite to each other, and the surface on which the fourth X-axis floating plates are located is perpendicular to the X-axis direction; The number of the second Y-axis floating plate, the third Y-axis floating plate, the fourth Y-axis floating plate and the Y-axis receiving plate in the Y-axis direction detection unit is two, and the two fourth Y-axis floating plates are respectively located at two second side portions opposite to each other, and the surface where the fourth Y-axis floating plates are located is perpendicular to the Y-axis direction.

6. The ball-type anti-shake motor according to claim 1, wherein: Also includes: a second receiving plate disposed on the same surface as the emitting plate, and the second receiving plate is disposed opposite to the first floating plate; When the first mover moves along the focusing direction, the facing area between the first floating electrode and the second receiving electrode changes; the capacitance value generated by the capacitor formed by the emitting electrode, the second receiving electrode and the first floating electrode is used to determine the moving distance of the first mover in the focusing direction.

7. The ball-type anti-shake motor according to claim 6, characterized in that: The number of the second receiving plates is two; The two second receiving plates are arranged sequentially in the focusing direction, and when the first mover moves along the focusing direction, a first change in the area facing each other between the first floating plate and one of the second receiving plates is equal to a second change in the area facing each other between the first floating plate and the other of the second receiving plates; When the first mover moves along the focusing direction, the facing area between the first floating plate and the emitter plate does not change.

8. The ball-type anti-shake motor according to claim 1, wherein: The third floating plate and the fourth floating plate are integrally formed to form a bent structure, and the third floating plate is perpendicular to the fourth floating plate.

9. The ball-type anti-shake motor according to claim 1, wherein: Also includes: a first drive unit; The first driving unit is configured to drive the first mover to move in the focusing direction through a magnetic field force; The ball-type anti-shake motor further includes: a magnetic field detection sensor; The magnetic field detection sensor is disposed adjacent to the first driving unit, and is configured to detect a magnetic field generated by the first driving unit, and determine a moving distance of the first mover in the focusing direction based on the detected magnetic field.

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

Images