Ball type anti-shake motor and electronic equipment

Abstract

The invention relates to the technical field of camera shooting, and discloses a ball type anti-shake motor and electronic equipment. The ball type anti-shake motor comprises a transmitting polar plate arranged on a circuit board, a first floating polar plate opposite to the transmitting polar plate is arranged on a first rotor, and electric field transmission with a third floating polar plate arranged on a second rotor is achieved by means of a second floating polar plate electrically connected with the first floating polar plate. And a fourth floating polar plate electrically connected with the third floating polar plate and a first receiving polar plate on the circuit board are utilized to form a capacitive detection unit for detecting the displacement in the shaking direction. Through an electric field transmission effect among a plurality of floating polar plates, a capacitive detection unit is constructed under the condition that the second mover is not directly in circuit connection with the circuit board. During detection, the opposite area of the second floating polar plate and the third floating polar plate and the distance between the fourth floating polar plate and the first receiving polar plate change simultaneously, so that the accuracy and the sensitivity of detection 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 electronic equipment. Background Art

[0002] The ball-type anti-shake motor drives the ball to roll in the rolling groove set on the mover through electromagnetic force, which in turn drives the mover to move, offsetting the displacement deviation caused by external vibration in real time, thereby achieving focus and optical image stabilization. Since the ball-type anti-shake motor needs to have displacement in at least the focus direction and the shake direction, the first mover and the second mover are usually designed to be nested to achieve movement in more than two directions.

[0003] Since the circuit board of the ball-type anti-shake motor is usually designed on the periphery of the overall structure, it is difficult for the second mover located relatively inner in the nested structure to form a direct circuit connection with the circuit board. As a result, the ball-type anti-shake motor usually uses a magnetic field displacement detection unit to determine the movement of the second mover, or transmits the electric field through multiple floating plates that do not require circuit connection, so as to avoid directly setting displacement detection related components that require circuit connection on the second mover.

[0004] However, the current displacement detection method of the ball-type anti-shake motor has at least the following disadvantages: the magnetic field displacement detection unit is easily affected by the change of the magnetic field in the environment, resulting in inaccurate detection results. The transmission of the electric field by multiple floating plates will reduce the capacitance value of the capacitor structure formed while the floating plates transmit the electric field, thereby affecting the detection accuracy and sensitivity. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a ball-type anti-shake motor and electronic device, in which the moving distance of the second mover in the shaking direction is determined by the capacitance formed by the second floating electrode plate and the third floating electrode plate, and the capacitance formed by the fourth floating electrode plate and the first receiving electrode plate. When detecting the moving distance, the facing area between the second floating electrode plate and the third floating electrode plate, and the distance between the fourth floating electrode plate and the first receiving electrode plate change at the same time, thereby improving the detection accuracy and sensitivity.

[0006] 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 make a relative displacement with the base in a focusing direction; the second mover uses the second ball to make a relative displacement with the base in a shaking direction; wherein the shaking direction is perpendicular to the focusing direction; 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 arranged 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 arranged at the second bottom and is opposite to the second floating electrode, a fourth floating electrode is arranged at the second side and is electrically connected to the third floating electrode, and a first receiving electrode is arranged 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 transmitting 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, comprising the above-mentioned ball-type anti-shake motor.

[0008] Compared with the related art in the field, the embodiment of the present invention provides an emitter plate on the circuit board, and provides a first floating plate opposite to the emitter plate on the first mover, and realizes the electric field transmission with the third floating plate provided on the second mover by means of the second floating plate electrically connected to the first floating plate, and then uses the fourth floating plate electrically connected to the third floating plate and the first receiving plate on the circuit board to form a capacitive detection unit for detecting the displacement in the shaking direction. Through the electric field transmission effect between multiple floating plates, when the second mover does not directly form a circuit connection with the circuit board, a capacitive detection unit is constructed to detect the movement of the second mover, which improves the accuracy of the detection result compared with the magnetic field detection unit. In addition, when detecting the moving distance, the facing area between 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, which improves the detection sensitivity compared with the case where only the relative area between a pair of opposite floating plates in the capacitive detection unit constructed by multiple floating plates changes.

[0009] In addition, the shaking direction includes: an X-axis direction and a Y-axis direction, wherein the X-axis direction and the Y-axis direction are both parallel to the bottom surface of the base, and the X-axis direction and the Y-axis direction are respectively perpendicular to the adjacent surfaces of the base; the second floating electrode plate includes: a second X-axis floating electrode plate and a second Y-axis floating electrode plate, the third floating electrode plate includes: a third X-axis floating electrode plate and a third Y-axis floating electrode plate, the fourth floating electrode plate includes: a fourth X-axis floating electrode plate and a fourth Y-axis floating electrode plate; the first receiving electrode plate includes: an X-axis receiving electrode plate and a Y-axis receiving electrode plate; the transmitting electrode 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 transmitting 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 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 are all two, and the two fourth X-axis floating plates are respectively located at two second side portions opposite to each other, and the surface where the fourth X-axis floating plate is 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 are all 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 plate 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 plate and the third floating electrode plate decreases, while the distance between the fourth floating electrode plate and the first receiving electrode plate increases; or, when the second mover moves in the shaking direction, the facing area between the second floating electrode plate and the third floating electrode plate increases, while the distance between the fourth floating electrode plate and the first receiving electrode plate decreases.

[0012] In addition, when the second mover moves in the shaking direction, the facing area between the second floating electrode plate and the third floating electrode plate decreases, and the distance between the fourth floating electrode plate and the first receiving electrode plate decreases; or, when the second mover moves in the shaking direction, the facing area between the second floating electrode plate and the third floating electrode plate increases, and the distance between the fourth floating electrode plate and the first receiving electrode plate 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; and the moving distance of the first mover in the focusing direction is determined by using the capacitance value generated by the capacitor formed by the emitting electrode plate, the second receiving electrode plate and the first floating electrode plate.

[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 emitting plate does not change.

[0015] In addition, the third floating electrode plate and the fourth floating electrode plate are integrally formed to form a bent structure, and the third floating electrode plate is perpendicular to the fourth floating electrode 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 moving 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 described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1 It is a schematic diagram of the exploded structure of the ball-type anti-shake motor according to the embodiment of the present scheme; Figure 2 It is a simplified structural diagram of a vibration direction displacement detection structure in a ball-type anti-shake motor according to an embodiment of the present solution; Figure 3 is a schematic diagram of relevant parameters of the vibration direction displacement detection structure in the ball-type anti-shake motor according to the embodiment of the present solution; Figure 4 It is a schematic diagram of the structure of the first floating electrode plate and the second floating electrode plate of the ball-type anti-shake motor according to the embodiment of the present solution; Figure 5 It is a schematic structural diagram of the third floating electrode plate and the fourth floating electrode plate of the ball-type anti-shake motor according to the embodiment of the present solution; Figure 6 is a schematic diagram of a partial three-dimensional structure of a ball-type anti-shake motor according to an embodiment of the present solution; Figure 7 is a schematic diagram of the top view of the Z-axis direction of the ball-type anti-shake motor according to an embodiment of the present solution; 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 in the embodiment of the present solution; Fig. 9 It 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 the embodiment of the present solution; Fig.10 is a schematic diagram of the three-dimensional structure of a ball-type anti-shake motor according to an embodiment of the present solution; Fig.11 It is a schematic diagram of related parameters of the emitter plate, the first floating plate and the second receiving plate in the ball-type anti-shake motor according to the embodiment of the present solution; Fig.12 It is a schematic diagram of related parameters of the second floating electrode plate, the third floating electrode plate and the first receiving electrode plate in the ball-type anti-shake motor according to the embodiment of the present solution; Fig.13 It is a schematic diagram of related parameters of the fourth floating electrode plate and the first receiving electrode plate in the ball-type anti-shake motor according to the embodiment of the present solution; Fig.14 is a schematic structural diagram of a third floating electrode plate and a fourth floating electrode plate of a ball-type anti-shake motor according to another embodiment of the present solution; Fig.15 is a partial three-dimensional structural schematic diagram of a ball-type anti-shake motor according to another embodiment of the present solution; Fig.16 is a schematic diagram of a top view of the structure of a ball-type anti-shake motor in the Z-axis direction according to another embodiment of the present solution; Fig.17 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 in another embodiment of the present solution; Fig.18 It is a schematic diagram of the corresponding relationship between the anti-shake direction displacement and the differential capacitance signal in a ball-type anti-shake motor in another embodiment of the present solution; Fig.19 It is a schematic diagram of related parameters of the second floating electrode plate, the third floating electrode plate, the fourth floating electrode plate and the first receiving electrode plate in the ball-type anti-shake motor in another embodiment of the present solution; Fig. 20 It is a schematic diagram of the three-dimensional structure of a ball-type anti-shake motor in another embodiment of the present scheme.

[0019] Description of reference numerals: 1- Circuit board; 2- Base; 31-first mover; 32-second mover; 41-first ball; 42-second ball; 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; 60-a second receiving electrode plate; 61-a magnetic field detection sensor; 7- gland; 8- housing; 9- Lens; 101 - first driving coil. DETAILED DESCRIPTION

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

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

[0022] An embodiment of the present invention relates to a ball type anti-shake motor, such as Figure 1As 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 relative displacement with the base 2 in the focus direction; the second mover 32 uses the second ball 42 to make relative displacement with the base 2 in the shaking direction; wherein the shaking 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 arranged on the circuit board 1, a first floating plate 51 opposite to the emitter plate 50 is arranged on the first side, a second floating plate 52 electrically connected to the first floating plate 51 is arranged on the first bottom, a third floating plate 53 opposite to the second floating plate 52 is arranged on the second bottom, a fourth floating plate 54 electrically connected to the third floating plate 53 is arranged on the second side, and a first receiving plate 55 opposite to the fourth floating plate 54 in the shaking direction is arranged on the circuit board 1; 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 capacitor 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.

[0023] Compared with the related art in the field, the embodiment of the present invention provides an emitter plate on the circuit board, and provides a first floating plate opposite to the emitter plate on the first mover, and realizes the electric field transmission with the third floating plate provided on the second mover by means of the second floating plate electrically connected to the first floating plate, and then uses the fourth floating plate electrically connected to the third floating plate and the first receiving plate on the circuit board to form a capacitive detection unit for detecting the displacement in the shaking direction. Through the electric field transmission effect between multiple floating plates, when the second mover does not directly form a circuit connection with the circuit board, a capacitive detection unit is constructed to detect the movement of the second mover, which improves the accuracy of the detection result compared with the magnetic field detection unit. In addition, when detecting the moving distance, the facing area between 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, which improves the detection sensitivity compared with the case where only the relative area between a pair of opposite floating plates in the capacitive detection unit constructed by multiple floating plates changes.

[0024] like Figure 2As shown, a jitter 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 transmitting signal end, the first receiving plate 55 is connected to the IC receiving signal end, and the emitter plate 50 and the first receiving plate 55 realize the capacitance effect through the electrically connected first floating plate 51 and the second floating plate 52, the electrically connected third floating plate 53 and the fourth floating plate 54, and the jump bridge characteristics of the second floating plate 52 and the third floating plate 53 arranged opposite to each other.

[0025] 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 area facing each other between the emitter plate 50 and the first floating plate 51 is , the distance is , the first capacitor is The 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 electrode 54 and the first receiving electrode 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, 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 are 1m apart in a vacuum, the magnitude of the force between them is 8.987551× N, that is, k=8.987551× N·m² / C. Therefore, when the area facing each other 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 the series connection 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.

[0026] When the second mover moves in the shaking direction, the change of the series equivalent capacitance will be different based on the different relative position settings of the second floating plate 52 and the third floating plate 53. The following is a description of the different relative position settings of the second floating plate 52 and the third floating plate 53: One implementation method is: 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 While decreasing, the distance between the fourth floating electrode 54 and the first receiving electrode 55 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 the value of the series equivalent capacitance C will reduce. 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.

[0027] like Figure 4 As shown, the arrangement of the electrodes on the first mover in this embodiment, the first floating electrode 51 is arranged on the first side of the first mover, and the second floating electrode 52 electrically connected to the first floating electrode 51 is arranged on the first bottom of the first mover. The number of the second floating electrode 52 can be adjusted according to the needs. If the second floating electrode 52 is arranged adjacent to the first floating electrode 51, the first floating electrode 51 and the second floating electrode 52 can be directly connected to achieve electrical connection between the two. If the second floating electrode 52 is far away from the first floating electrode 51, the second floating electrode 52 and the first floating electrode 51 can be connected by wires, and the wires are attached to the first bottom wiring.

[0028] like Figure 5As shown, the arrangement of the various electrodes on the second mover in this embodiment, 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.

[0029] 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 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 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.

[0030] In addition, if Figure 7 As shown, it is a top view of the motor in the Z-axis direction. Figure 7 It can be known that the number of the second X-axis floating electrode 521, the third X-axis floating electrode 531, the fourth X-axis floating electrode 541 and the X-axis receiving electrode 551 used to determine the moving distance of the second mover 32 in the X-axis direction are all two, and the two fourth X-axis floating electrodes 541 are respectively located at two second side portions opposite to each other, and the surface where the fourth X-axis floating electrode 541 is located is perpendicular to the X-axis direction; the number of the second Y-axis floating electrode 522, the third Y-axis floating electrode 532, the fourth Y-axis floating electrode 542 and the Y-axis receiving electrode 552 in the Y-axis direction detection unit are all two, and the two fourth Y-axis floating electrodes 542 are respectively located at two second side portions opposite to each other, and the surface where the fourth Y-axis floating electrode 542 is located is perpendicular to the Y-axis direction.

[0031] Since the two groups of X-axis detection units and the two groups of Y-axis detection units are arranged symmetrically with respect to the center axis of the lens, the capacitance value changes of the two groups of X-axis equivalent capacitors Cx1 and Cx2 formed in the two groups of X-axis detection units, and the capacitance value changes of the two groups of Y-axis equivalent capacitors Cy1 and Cy2 formed in the two groups of Y-axis detection units are similarly affected by the environment and human operation, so the influence of such noise on the detection results can be eliminated by 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).

[0032] Take the displacement detection in the X-axis direction as an example. Figures 8 to 9 The figure shows the simulation test curve of the X-axis direction detection unit, where: Figure 8 The diagram is a schematic diagram of the capacitance change of two sets of X-axis equivalent capacitances Cx1 and Cx2 within the range of ±250μm in the X-axis direction displacement. Figure 8 It can be seen that Cx1 and Cx2 show opposite change trends. Fig. 9 is a schematic diagram of the corresponding relationship between the displacement in the X-axis direction and the differential capacitance signal Cx1-Cx2, Fig. 9 It can be seen that within the range of ±125 microns in the X-axis direction, the differential capacitance signal Cx1-Cx2 has good linearity, and beyond the range of ±125μm, linearity correction can be achieved through subsequent compensation. Therefore, the differential capacitance signal based on the X-axis can accurately detect the displacement in the X-axis direction. Similarly, the differential capacitance signal in the Y-axis direction can also accurately detect the displacement in the Y-axis direction.

[0033] In addition, if Fig.10 As shown, the ball-type anti-shake motor also includes: a second receiving electrode plate 60 arranged on the same surface as the emitting electrode plate 50, and the second receiving electrode plate 60 is arranged opposite to the first floating electrode plate 51; when the first mover 31 moves along the focusing direction, the facing area between the first floating electrode plate 51 and the second receiving electrode plate 60 changes; the capacitance value generated by the capacitor formed by the emitting electrode plate 50, the second receiving electrode plate 60 and the first floating electrode plate 51 is used to determine the moving distance of the first mover 31 in the focusing direction.

[0034] The number of the second receiving plates 60 can be two; the two second receiving plates 60 are arranged in sequence in the focusing direction. When the first mover 31 moves along 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 along the focusing direction, the area facing each other between the first floating plate 51 and the emitter plate 50 does not change. The capacitance formed by the first floating plate 51 and one of the second receiving plates 60 and the capacitance formed by the first floating plate 51 and the other second receiving plate 60 are used for differential calculation to correct or denoise the capacitance signal, eliminate the noise that affects the accuracy of the calculation result caused by environmental factors or human operation factors, and improve the sensitivity of the lens position movement control. The differential calculation method is similar to the differential calculation method of the previous jitter direction, and will not be repeated here.

[0035] The size parameters between the electrodes in the focus direction detection unit and the shake direction detection unit are specifically described below: Assuming that the ball-type anti-shake motor is in the initial position (the displacements in the X-axis, Y-axis, and Z-axis directions are all 0), the states of the emitter plate 50, the two second receiving plates 60, and the first floating plate 51 are as follows: Fig.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 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 at the lower position is b2, wherein a1 and b1 are both greater than the stroke of the first mover moving upward at the initial position, and a2 and b2 are both greater than the stroke of the first mover moving downward at the initial position. If the initial position is the middle position of the stroke of the first mover, then a1, b1, a2 and b2 are all greater than 1 / 2 of the stroke of the first mover in the focusing direction. Fig.11 The up and down direction shown is the Z-axis direction.

[0036] The states of the second floating plate 52, the third floating plate 53 and the first receiving plate 55 are as follows: Fig.12As shown, the distance between the second floating electrode plate 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. Such an 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 pole plate 52 and the upper edge of the third floating pole plate 53 is c1, the distance between the right edge of the second floating pole plate 52 and the right edge of the third floating pole plate 53 is c2, the distance between the lower edge of the second floating pole plate 52 and the upper edge of the third floating pole plate 53 is c3, and the distance between the left edge of the second floating pole plate 52 and the left edge of the third floating pole plate 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 the crosstalk caused by the second mover moving in different directions. Fig.12 If the up-down direction is the X-axis direction, the left-right direction is the Y-axis direction. Fig.12 If the up-down direction is the Y-axis direction, the left-right direction is the X-axis direction. Fig.13 As shown, the distance between the upper edge of the fourth floating electrode plate 54 and the upper edge of the first receiving electrode plate 55 is e1, the distance between the right edge of the fourth floating electrode plate 54 and the right edge of the first receiving electrode plate 55 is e2, the distance between the lower edge of the fourth floating electrode plate 54 and the lower edge of the first receiving electrode plate 55 is e3, and the distance between the left edge of the fourth floating electrode plate 54 and the left edge of the first receiving electrode plate 55 is e4, wherein e2 is greater than the stroke of the second mover in the right direction, e4 is greater than the stroke of the second mover in the left direction, and e1 and e3 are greater than zero. This eliminates the crosstalk caused by the second mover moving in different directions. Fig.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.

[0037] In addition, in order to ensure the amount of signal 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.

[0038] 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 While decreasing, the distance between the fourth floating plate and the first receiving plate or, when the second mover moves in the shaking direction, the facing area between the second floating plate and the third floating plate As the distance between the fourth floating plate and the first receiving plate increases, Increase.

[0039] because The impact on the value of the series equivalent capacitance C is greater than The influence 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.

[0040] and The numerical influence on the series equivalent capacitance C is derived as follows: For the series equivalent capacitance C The derivation is, ; The derivative formula is negative, which means that as increases, C decreases continuously. The absolute value of the derivative is 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.

[0041] For the series equivalent capacitance C The derivation is, ; The derivative formula is positive, which means that as As C increases, the derivative and S 2 is inversely proportional to the square of . When the value is very small, the derivative is large, and the capacitance However, since the derivative is related to S 2 is inversely proportional to the square of sensitive to changes.

[0042] This setting can be done by To 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.

[0043] like Fig.14 As shown, the relative position relationship between the third floating electrode 53 and the fourth floating electrode 54 in this embodiment is shown. The third floating electrode 53 and the fourth floating electrode 54 are integrally formed to form a bent structure, and the third floating electrode 53 and the fourth floating electrode 54 are perpendicular to each other.

[0044] like Fig.15is a structural schematic diagram of the positional relationship between the various plates in this embodiment, Fig.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 51, and the second Y-axis receiving plate 512 are shown in FIG. 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.

[0045] Similarly, in this embodiment, 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 can be two, and 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 can be two. This facilitates differential calculation to eliminate noise.

[0046] like Figure 17 to Figure 18 The figure shows the simulation test curve of the X-axis direction detection unit, where: Fig.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. Fig.18 is the displacement in the X-axis direction and the differential capacitance signal x1- Schematic diagram of the corresponding relationship between x2, through The reverse compensation shows good linearity within ±250μm.

[0047] Regarding the detection of the focus direction of the motor structure in this embodiment, its detection structure is consistent with the detection structure of the focus direction in the previous embodiment, including: a second receiving electrode plate 60 is arranged on the same surface as the transmitting electrode plate 50, and the second receiving electrode plate 60 is arranged opposite to the first floating electrode plate 51; when the first mover 31 moves along the focus direction, the facing area between the first floating electrode plate 51 and the second receiving electrode plate 60 changes; the capacitance value generated by the capacitor formed by the transmitting electrode plate 50, the second receiving electrode plate 60 and the first floating electrode plate 51 is used to determine the movement distance of the first mover 31 in the focus direction. The specific details of the detection structure of the focus direction refer to the previous embodiment, and will not be repeated here to avoid repetition.

[0048] In the following, the size parameters between the plates in the detection unit of the shaking direction are specifically described in this embodiment: Assuming that the ball-type anti-shake motor is in the initial position (the displacements in the X-axis, Y-axis, and Z-axis directions are all 0), the states of the second floating plate 52, the third floating plate 53, the fourth floating plate 54, and the first receiving plate 55 are as follows: Fig.19 As shown, the distance between the second floating electrode plate 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 pole plate 52 and the upper edge of the third floating pole plate 53 is f1, the distance between the right edge of the second floating pole plate 52 and the right edge of the third floating pole plate 53 is f2, the distance between the lower edge of the second floating pole plate 52 and the upper edge of the third floating pole plate 53 is f3, and the distance between the left edge of the second floating pole plate 52 and the left edge of the third floating pole plate 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 the crosstalk caused by the second mover moving in different directions. Fig.19 If the up-down direction is the X-axis direction, the left-right direction is the Y-axis direction. Fig.19 If the up-down direction is the Y-axis direction, the left-right direction is the X-axis direction.

[0049] In addition, the ball-type anti-shake motor includes a driving unit, including a first driving magnet arranged on the first mover, and a first driving coil arranged on the base. The first driving magnet and the first driving coil are arranged relative to each other, and are used to drive the first mover to move in the focusing direction. The first driving magnet forms a fixed magnetic field, and the first driving coil is connected to the circuit board for power supply and control through the external circuit and IC. After the first driving coil is energized, an induced magnetic field is generated, and the interaction between the first driving coil and the fixed magnetic field formed by the first driving magnet generates a Lorentz force. Since the first driving coil is fixed on the base 2 and cannot move, the Lorentz force is fed back to the first driving magnet. Due to the presence of the first ball, the first mover 31, the carrier of the first driving magnet, can move relative to the base, thereby realizing the driving of the first mover. The magnitude of the Lorentz force can be controlled by changing the current in the first driving coil, and the magnitude of the force on the first mover can be changed to control the distance of movement.

[0050] Similarly, regarding the drive of the second mover, the drive unit includes a second drive magnet arranged on the second mover, and a second drive coil arranged on the base, and the second drive magnet is arranged opposite to the second drive coil, and is used to drive the second mover to move in the shaking direction. The driving principle is the same as the driving principle of the first mover mentioned above. Among them, the second drive coil includes an X-axis drive coil and a Y-axis drive coil, and the corresponding second drive magnet includes: an X-axis drive magnet and a Y-axis drive magnet, the X-axis drive coil is arranged opposite to the X-axis drive magnet, and the Y-axis drive coil is arranged opposite to the Y-axis drive magnet. The first drive magnet and the first drive coil, the X-axis drive coil and the X-axis drive magnet, the Y-axis drive coil and the Y-axis drive magnet, the three groups of drive units are respectively located on different sides of the motor to avoid mutual influence of the drive magnetic field and affect the driving effect of the motor.

[0051] In order to ensure the driving effect of the drive unit, the drive unit is usually set in the middle area of ​​the motor side. As mentioned above, the capacitive detection unit is also set on the motor side. In order to ensure the driving effect of the motor, the setting position of the capacitive detection unit can be avoided, that is, the capacitive detection unit set on the same motor side as the drive unit is set in the two side areas of the motor side, and the middle area is used as the setting position of the drive unit.

[0052] 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. Fig. 20As shown, a magnetic field detection sensor 61 is arranged in the surrounding area of ​​the first driving coil 101 of the first driving unit. The magnetic field detection sensor 61 is fixed on the circuit board to detect the change of the magnetic field of the first driving magnet. The magnetic field detection sensor 61 can be a Hall or TMR sensor. Different types of detection units are used to perform position detection on the focus direction and the jitter direction respectively. The two types of detection units do not interfere with each other, which improves the accuracy of the detection result to a certain extent.

[0053] In addition, if Figure 1 As shown, the ball-type anti-shake motor also includes: a pressure cover 7 that fits the second mover 32; the pressure cover 7 abuts the second mover 32 in the focus direction to limit the movement of the second mover 32 in the focus direction. That is, the movement of the first mover in the focus direction can drive the second mover to move in the focus direction, but the second mover itself can only move in the shaking direction. The second mover itself is restricted by the pressure cover and will not move in the focus direction, and the movement of the second mover in the shaking direction will not drive the first mover to move.

[0054] In addition, if Figure 1 As shown, the ball-type anti-shake motor also includes a shell 8 covering the periphery of all component structures, and the shell 8 protects the internal structure of the ball-type anti-shake motor.

[0055] In order to reduce the volume of the ball-type anti-shake motor, the internal components of the ball-type anti-shake motor can be overlapped in the focus 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, the middle area is used to accommodate the lens, and the frame surrounds the outside of the second mover 32. Such a structure makes the second mover 32 overlap with the first mover 31 at least partially in the focus direction, which can reduce the thickness of the ball-type anti-shake motor in the focus direction. Similarly, the base 2 overlaps with the first mover 31 at least partially in the focus direction, which can also reduce the thickness of the ball-type anti-shake motor in the focus direction. The circuit board 1 is arranged on the side of the base 2, which is convenient for the electrical connection between the first detection unit and the second detection unit set in the ball-type anti-shake motor. The circuit board 1 can be a flexible circuit board FPC, which is more convenient to be arranged in contact with the outer surface of the base. The middle area of ​​the ball-type anti-shake motor has a space for installing the lens 9.

[0056] Another feasible embodiment of the present invention relates to an electronic device, including the above-mentioned ball-type anti-shake motor. The ball-type anti-shake motor is used in conjunction with a lens to achieve image acquisition and automatically calibrate the vibration of the external environment to improve the quality of image acquisition.

[0057] Compared with the related art, the electronic device provided by the embodiment of the present invention is provided with the ball-type anti-shake motor provided by the aforementioned embodiment. Therefore, it also has the technical effects provided by the aforementioned embodiment, which will not be elaborated here.

[0058] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present invention, and that in actual applications, various changes may be made in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A ball type anti-shake motor, characterized in that: include: A first mover, a second mover, a first ball, a second ball, a circuit board and a base; The first mover uses the first ball to cause relative displacement with the base in the focusing direction; The second mover uses the second ball to make relative displacement with the base in a shaking direction; wherein the shaking direction is perpendicular to the focusing direction; The 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 a shaking direction; When the second mover moves in the shaking direction, the facing area between the second floating electrode plate and the third floating electrode plate changes, and at the same time, the distance between the fourth floating electrode plate and the first receiving electrode plate changes; The moving distance of the second mover in the shaking direction is determined by using a capacitor jointly 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 electrode plate and the third floating electrode plate decreases, while the distance between the fourth floating electrode plate and the first receiving electrode plate increases; Alternatively, when the second mover moves in the shaking direction, the facing area between the second floating electrode plate and the third floating electrode plate increases, while the distance between the fourth floating electrode plate and the first receiving electrode 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 electrode plate and the third floating electrode plate decreases, and the distance between the fourth floating electrode plate and the first receiving electrode plate decreases; Alternatively, when the second mover moves in the shaking direction, the facing area between the second floating electrode plate and the third floating electrode plate increases, while the distance between the fourth floating electrode plate and the first receiving electrode 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, and the Y-axis direction detection unit 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 are all two, and the two fourth X-axis floating plates are respectively located at two second side portions opposite to each other, and the surface where the fourth X-axis floating plate is 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 are two each, and the two fourth Y-axis floating plates are respectively located at two opposite second side portions, 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, characterized in that: Also includes: A second receiving electrode plate is 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 moving distance of the first mover in the focusing direction is determined by the capacitance value generated by the capacitor formed by the transmitting electrode plate, the second receiving electrode plate and the first floating electrode plate.

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 in sequence 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 electrode plate and the emitter electrode plate does not change.

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

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

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

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