Ball type anti-shake motor and electronic equipment

Abstract

The utility model relates to the technical field of camera shooting, and discloses a ball type anti-shake motor and electronic equipment. According to the ball type anti-shake motor, a hollow area is arranged on a first mover arranged on the periphery of a second mover, a protruding part is arranged at the position, corresponding to the hollow area, of the second mover, and a first floating polar plate and a second floating polar plate are arranged on the protruding part of the second mover. The first floating polar plate and the second floating polar plate are arranged on the circuit board, the first emitting polar plate opposite to the first floating polar plate and the first receiving polar plate opposite to the second floating polar plate are arranged on the circuit board, and the protruding part protrudes relative to the side portion of the first mover in the hollowed-out area of the first mover, so that the distance between the first floating polar plate and the first emitting polar plate can be shortened; and the distance between the second floating polar plate and the first receiving polar plate is shortened, so that the sensitivity of a capacitive detection unit formed by the first floating polar plate, the first transmitting polar plate, the second floating polar plate and the first receiving polar plate to position detection is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cameras, and particularly relates to a ball-type anti-shake motor and an electronic device. Background Art

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

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

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

[0005] The purpose of the embodiments of the utility model is to provide a ball-type anti-shake motor and an electronic device. By arranging a hollow area on the first mover, and arranging a protruding part at the position of the second mover corresponding to the hollow area, the first floating plate and the second floating plate arranged on the protruding part are correspondingly arranged with the first emitting plate and the first receiving plate on the circuit board to form a capacitor structure. The distance between the first floating plate and the first emitting plate is shortened by using the protruding part, and the distance between the second floating plate and the first receiving plate is shortened, thereby improving the sensitivity of the capacitor structure to position detection.

[0006] To solve the above technical problems, an embodiment of the present utility model provides a ball-type anti-shake motor, comprising: a first mover, a second mover, a first ball, a second ball, a circuit board, and a base; the first mover uses the first ball to have a relative displacement with the base in the focusing direction; the second mover uses the second ball to have a relative displacement with the base in the shaking direction; wherein, the shaking direction is perpendicular to the focusing direction; the first mover is disposed around the second mover, and a side portion of the first mover includes a hollowed-out area, and the second mover includes a protruding portion that protrudes relative to the side portion of the first mover at the hollowed-out area of the first mover; the circuit board is disposed on a side portion of the base, and the circuit board is disposed around the first mover; a first floating electrode plate and a second floating electrode plate that are electrically connected to each other are disposed on the protruding portion of the second mover, a first emitting electrode plate that is disposed opposite to the first floating electrode plate, and a first receiving electrode plate that is disposed opposite to the second floating electrode plate are disposed on the circuit board, the first floating electrode plate and the first emitting electrode plate are disposed opposite to each other, and the second floating electrode plate and the first receiving electrode plate are disposed opposite to each other; the first floating electrode plate and the first emitting electrode plate form a first capacitor, the second floating electrode plate and the first receiving electrode plate form a second capacitor, and the moving distance of the second mover in the shaking direction is determined by the capacitance value generated by the series equivalent capacitance of the first capacitor and the second capacitor.

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

[0008] Compared with the prior art, in the embodiment of the present utility model, the ball-type anti-shake motor is provided with a first mover and a second mover that move in different directions. Among them, the first mover moves in the focusing direction of the motor through the first ball, and the second mover moves in the shaking direction of the motor through the second ball. A hollowed-out area is provided on the first mover disposed around the second mover, and a protruding portion is provided at a position corresponding to the hollowed-out area of the second mover. A first floating electrode plate and a second floating electrode plate are provided on the protruding portion of the second mover, and a first emitting electrode plate disposed opposite to the first floating electrode plate and a first receiving electrode plate disposed opposite to the second floating electrode plate are provided on the circuit board. Since the protruding portion protrudes relative to the side portion of the first mover at the hollowed-out area of the first mover, the distance between the first floating electrode plate and the first emitting electrode plate can be shortened, and the distance between the second floating electrode plate and the first receiving electrode plate can be shortened, so that the sensitivity of the capacitive detection unit jointly formed by the first floating electrode plate, the first emitting electrode plate, the second floating electrode plate, and the first receiving electrode plate for position detection is improved.

[0009] In addition, the jitter directions include the X-axis direction and the Y-axis direction. The X-axis direction and the Y-axis direction are both parallel to the bottom surface of the base, and the X-axis direction and the Y-axis direction are respectively perpendicular to the adjacent surfaces of the base. The first emission electrode plate includes an X-axis emission electrode plate and a Y-axis emission electrode plate. The first receiving electrode plate includes an X-axis receiving electrode plate and a Y-axis receiving electrode plate. The first floating electrode plate includes a first X-axis floating electrode plate and a first Y-axis floating electrode plate, and the second floating electrode plate includes a second X-axis floating electrode plate and a second Y-axis floating electrode plate. The first X-axis floating electrode plate and the second X-axis floating electrode plate are arranged on the first side surface of the second mover, and the first Y-axis floating electrode plate and the second Y-axis floating electrode plate are arranged on the second side surface of the second mover. The first side surface and the second side surface are adjacent surfaces. The first X-axis floating electrode plate and the X-axis emission electrode plate are arranged opposite to each other in the X-axis direction, and the second X-axis floating electrode plate and the X-axis receiving electrode plate are arranged opposite to each other in the X-axis direction. The moving distance of the second mover in the X-axis direction is determined by using the first X-axis floating electrode plate, the X-axis emission electrode plate, the second X-axis floating electrode plate, and the X-axis receiving electrode plate. The first Y-axis floating electrode plate and the Y-axis emission electrode plate are arranged opposite to each other in the Y-axis direction, and the second Y-axis floating electrode plate and the Y-axis receiving electrode plate are arranged opposite to each other in the Y-axis direction. The moving distance of the second mover in the Y-axis direction is determined by using the first Y-axis floating electrode plate, the Y-axis emission electrode plate, the second Y-axis floating electrode plate, and the Y-axis receiving electrode plate.

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

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

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

[0013] In addition, when the first emitting plate, the second emitting plate, the first receiving plate, and the second receiving plate are all disposed on the same plane of the circuit board, the second emitting plate and the second receiving plate are clamped between the first emitting plate and the first receiving plate.

[0014] In addition, 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 in the focusing direction, the first change amount of the facing area between the third floating plate and one of the second receiving plates is equal to the second change amount of the facing area between the third floating plate and the other second receiving plate; when the first mover moves in the focusing direction, the facing area between the third floating plate and the second emitting plate does not change.

[0015] In addition, the first emitting plate and the second emitting plate are integrally formed as a common emitting plate; the first orthographic projection area of the first floating plate toward the common emitting plate does not overlap with the second orthographic projection area of the third floating plate toward the common emitting plate.

[0016] In addition, the ball-type anti-shake motor further includes: a driving unit; the driving unit includes: a first driving magnet disposed on the first mover, and a first driving coil disposed on the base, the first driving magnet and the first driving coil are oppositely disposed to drive the first mover to move in the focusing direction; the driving unit includes: a second driving magnet disposed on the second mover, and a second driving coil disposed on the base, the second driving magnet and the second driving coil are oppositely disposed to drive the second mover to move in the jitter direction.

[0017] In addition, when the plane where the first driving magnet is located is between the plane where the first floating plate is located and the plane where the first emitting plate is located, the first emitting plate and the first receiving plate are respectively on both sides of the first driving coil.

[0018] In addition, the ball-type anti-shake motor further includes: a gland fitted to the second mover; the gland abuts against the second mover in the focusing direction, and the gland restricts the movement of the second mover in the focusing direction. Description of the Drawings

[0019] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the drawings in the figures do not constitute a scale limitation.

[0020] Figure 1 is an exploded structural schematic diagram of the ball-type anti-shake motor according to an embodiment of the present solution;

[0021] Figure 2 is a simplified structural schematic diagram of the shake direction displacement detection structure in the ball-type anti-shake motor according to an embodiment of the present solution;

[0022] Figure 3 is a top view structural schematic diagram of the ball-type anti-shake motor according to an embodiment of the present solution;

[0023] Figure 4 is a three-dimensional structural schematic diagram of the ball-type anti-shake motor according to an embodiment of the present solution;

[0024] Figure 5 is a schematic diagram of the correspondence between the shake direction displacement and the capacitance signal in the ball-type anti-shake motor according to an embodiment of the present solution;

[0025] Figure 6 is a schematic diagram of the correspondence between the shake direction displacement and the differential capacitance signal in the ball-type anti-shake motor according to an embodiment of the present solution;

[0026] Figure 7 is a schematic diagram of the relevant parameters of the first floating plate, the second floating plate, the first emitting plate and the first receiving plate in the ball-type anti-shake motor according to an embodiment of the present solution;

[0027] Figure 8 is a schematic diagram of the relevant parameters of the third floating plate, the second emitting plate and the second receiving plate in the ball-type anti-shake motor according to an embodiment of the present solution.

[0028] Description of the Reference Numerals:

[0029] 1 - Circuit board;

[0030] 2 - Base;

[0031] 31 - First mover; 32 - Second mover; 321 - Protrusion;

[0032] 41 - First ball; 42 - Second ball;

[0033] 51 - First emission electrode plate; 52 - First reception electrode plate; 53 - First floating electrode plate; 54 - Second floating electrode plate; 511 - X - axis emission electrode plate; 512 - Y - axis emission electrode plate; 521 - X - axis reception electrode plate; 522 - Y - axis reception electrode plate; 531 - First X - axis floating electrode plate; 532 - First Y - axis floating electrode plate; 541 - Second X - axis floating electrode plate; 542 - Second Y - axis floating electrode plate;

[0034] 61 - Second emission electrode plate; 62 - Second reception electrode plate; 63 - Third floating electrode plate;

[0035] 7 - gland;

[0036] 8 - housing;

[0037] 9 - lens;

[0038] 101 - X - axis drive coil; 102 - Y - axis drive coil; 103 - First drive coil; 104 - First drive magnet. Detailed implementation mode

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will elaborate on each embodiment of the present utility model in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in each embodiment of the present utility model, many technical details are proposed for the reader to better understand the present utility model. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions required to be protected by the present utility model can still be achieved.

[0040] The division of the following embodiments is for convenience of description and should not constitute any limitation to the specific implementation of the present utility model. The various embodiments can be combined and cross - referenced with each other on the premise of no contradiction.

[0041] The embodiments of the present utility model relate to a ball - type anti - shake motor, such as Figure 1As shown in the figure, a 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 makes a relative displacement with the base 2 in the focusing direction by means of the first ball 41; the second mover 32 makes a relative displacement with the base 2 in the shaking direction by means of the second ball 42; wherein, the shaking direction is perpendicular to the focusing direction; the first mover 31 is arranged on the periphery of the second mover 32, and the side part of the first mover 31 includes a hollow area, and the second mover 32 includes a protruding part 321 protruding relative to the side part of the first mover 31 at the hollow area of the first mover 31; the circuit board 1 is arranged on the side part of the base 2 and is arranged on the periphery of the first mover 31. As Figure 2 shown, the protruding part of the second mover 32 is provided with a first floating electrode plate 53 and a second floating electrode plate 54 which are electrically connected to each other. The circuit board 1 is provided with a first emitting electrode plate 51 oppositely arranged with the first floating electrode plate 53 and a first receiving electrode plate 52 oppositely arranged with the second floating electrode plate 54. The first floating electrode plate 53 and the first emitting electrode plate 51 are oppositely arranged in the shaking direction, and the second floating electrode plate 54 and the first receiving electrode plate 52 are oppositely arranged in the shaking direction; the first floating electrode plate 53 and the first emitting electrode plate 51 form a first capacitor, and the second floating electrode plate 54 and the first receiving electrode plate 52 form a second capacitor. The moving distance of the second mover 32 in the shaking direction is determined by the capacitance value generated by the series equivalent capacitance of the first capacitor and the second capacitor.

[0042] Compared with the prior art, in the embodiment of the present invention, the ball-type anti-shake motor is provided with a first mover and a second mover that move in different directions. Among them, the first mover moves in the focusing direction of the motor through the first ball, and the second mover moves in the shaking direction of the motor through the second ball. A hollow area is provided on the first mover arranged on the periphery of the second mover, and a protruding part is provided at the corresponding position of the second mover and the hollow area. A first floating electrode plate and a second floating electrode plate are provided on the protruding part of the second mover, and a first emitting electrode plate oppositely arranged with the first floating electrode plate and a first receiving electrode plate oppositely arranged with the second floating electrode plate are provided on the circuit board. Since the protruding part protrudes relative to the side part of the first mover at the hollow area of the first mover, the distance between the first floating electrode plate and the first emitting electrode plate can be shortened, and the distance between the second floating electrode plate and the first receiving electrode plate can be shortened, so that the sensitivity of the capacitive detection unit jointly composed of the first floating electrode plate, the first emitting electrode plate, the second floating electrode plate and the first receiving electrode plate for position detection is improved.

[0043] As Figure 2As shown, it is a jitter direction displacement detection unit composed of a first emission electrode plate 51, a first reception electrode plate 52, a first floating electrode plate 53, and a second floating electrode plate 54. Among them, the first emission electrode plate 51 is connected to the signal emission end of the chip IC, the first reception electrode plate 52 is connected to the signal reception end of the IC, and the first emission electrode plate 51 and the first reception electrode plate 52 achieve a capacitive effect through the jumping bridging characteristics of the electrically connected first floating electrode plate 53 and second floating electrode plate 54.

[0044] The capacitance formed by the first emission electrode plate 51, the first reception electrode plate 52, the first floating electrode plate 53, and the second floating electrode plate 54 can be regarded as the series connection of a first capacitance formed by the first emission electrode plate 51 and the first floating electrode plate 53 and a second capacitance formed by the first reception electrode plate 52 and the second floating electrode plate 54. Assume that the facing area between the first emission electrode plate 51 and the first floating electrode plate 53 is , the distance is , and the first capacitance is ; the facing area between the first reception electrode plate 52 and the second floating electrode plate 54 is , the distance is , and the second capacitance is . The series equivalent capacitance of the first capacitance and the second capacitance is C’ = , where ε represents the dielectric constant of the medium, which is determined by the medium between the electrode plates, such as air, water, etc.; k represents the electrostatic force constant, also known as the Coulomb constant, indicating that for two point charges with a charge of 1 C each in a vacuum, when the two point charges are 1 m apart, the magnitude of the force between them is 8.987551× N, that is, k = 8.987551× N·m² / C. Therefore, when the facing area between the first emission electrode plate 51 and the first floating electrode plate 53 and the facing area between the first reception electrode plate 52 and the second floating electrode plate 54 always remain unchanged, the signal of the equivalent capacitance changes according to the distance between the first emission electrode plate 51 and the first floating electrode plate 53 and the distance between the first reception electrode plate 52 and the second floating electrode plate 54. Since the first emission electrode plate 51 and the first floating electrode plate 53 are oppositely arranged in the jitter direction, and the first reception electrode plate 52 and the second floating electrode plate 54 are oppositely arranged in the jitter direction, the distance between the first emission electrode plate 51 and the first floating electrode plate 53 and the distance between the first reception electrode plate 52 and the second floating electrode plate 54 are related to the moving distance of the second mover in the jitter direction. Therefore, the moving distance of the second mover in the jitter direction can be known according to the change of the signal of the equivalent capacitance.

[0045] Since both the first floating plate and the second floating plate are arranged on the protruding part of the second mover, compared with being directly arranged on the side of the second mover, the distance between the first floating plate and the first transmitting plate is shortened, and the distance between the second floating plate and the first receiving plate is shortened. According to the capacitance formula C = εS / 4πkd, on the basis of the reduction of the initial distance d (the distance between the first floating plate and the first transmitting plate, and the distance between the second floating plate and the first receiving plate), for the same distance change, the influence degree on the change of the capacitance value of the capacitor increases, that is, under the condition of the same distance change, the smaller the initial distance, the more obvious the change of the capacitance value.

[0046] Theoretically, the closer the protruding part is arranged to the circuit board, the more obvious the change effect of the capacitance value. During actual operation, without affecting the movement of the first mover in the focusing direction, the protruding part can be protruded relative to the first mover as much as possible. Considering the aesthetics of the structure, the outer surface of the protruding part can also be flush with the outer surface of the first mover.

[0047] In addition, as Figure 3 shown, the jitter direction includes the X-axis direction and the Y-axis direction, where both the X-axis direction and the Y-axis direction are parallel to the bottom surface of the base, and the X-axis direction and the Y-axis direction are respectively perpendicular to the adjacent surfaces of the base; the first transmitting plate 51 includes: an X-axis transmitting plate 511 and a Y-axis transmitting plate 512; the first receiving plate 52 includes: an X-axis receiving plate 521 and a Y-axis receiving plate 522; the first floating plate 53 includes: a first X-axis floating plate 531 and a first Y-axis floating plate 532, and the second floating plate 54 includes: a second X-axis floating plate 541 and a second Y-axis floating plate 542; the first X-axis floating plate 531 and the second X-axis floating plate 541 are arranged on the first side surface of the second mover, the first Y-axis floating plate 532 and the second Y-axis floating plate 542 are arranged on the second side surface of the second mover, and the first side surface and the second side surface are adjacent surfaces; the first X-axis floating plate 531 and the X-axis transmitting plate 511 are arranged opposite to each other in the X-axis direction, and the second X-axis floating plate 541 and the X-axis receiving plate 521 are arranged opposite to each other in the X-axis direction, and the moving distance of the second mover in the X-axis direction is determined by using the first X-axis floating plate 531, the X-axis transmitting plate 511, the second X-axis floating plate 541 and the X-axis receiving plate 521; the first Y-axis floating plate 532 and the Y-axis transmitting plate 512 are arranged opposite to each other in the Y-axis direction, and the second Y-axis floating plate 542 and the Y-axis receiving plate 522 are arranged opposite to each other in the Y-axis direction, and the moving distance of the second mover in the Y-axis direction is determined by using the first Y-axis floating plate 532, the Y-axis transmitting plate 512, the second Y-axis floating plate 542 and the Y-axis receiving plate 522.

[0048] As Figure 3As shown in the figure, the number of each of the first X-axis floating plates 531, X-axis emitting plates 511, second X-axis floating plates 541, and X-axis receiving plates 521 for determining the moving distance of the second mover 32 in the X-axis direction is two, forming two sets of X-axis direction detection units. Each set of X-axis direction detection units includes a first X-axis floating plate, an X-axis emitting plate, a second X-axis floating plate, and an X-axis receiving plate. The two sets of X-axis direction detection units are symmetrically arranged with respect to the central axis of the lens 9 of the ball-type anti-shake motor.

[0049] In addition, the number of each of the first Y-axis floating plates 532, Y-axis emitting plates 512, second Y-axis floating plates 542, and Y-axis receiving plates 522 for determining the moving distance of the second mover 32 in the Y-axis direction is two, forming two sets of Y-axis direction detection units. Each set of Y-axis direction detection units includes a first Y-axis floating plate, a Y-axis emitting plate, a second Y-axis floating plate, and a Y-axis receiving plate. The two sets of Y-axis direction detection units are symmetrically arranged with respect to the central axis of the lens 9 of the ball-type anti-shake motor.

[0050] Since the two sets of X-axis direction detection units and the two sets of Y-axis direction detection units are both symmetrically arranged with respect to the central axis of the lens, the changes in the capacitance values of the two sets of X-axis equivalent capacitors Cx1 and Cx2 formed in the two sets of X-axis direction detection units, and the changes in the capacitance values of the two sets of Y-axis equivalent capacitors Cy1 and Cy2 formed in the two sets of Y-axis direction detection units are similarly affected by the environment and human operations. Therefore, 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).

[0051] Taking the displacement detection in the X-axis direction as an example, as Figures 5 to 6 shown is the simulation test curve graph of the X-axis direction detection unit. Among them, Figure 5 is a schematic diagram of the changes in the capacitance values of the two sets of X-axis equivalent capacitors Cx1 and Cx2 within the range of ±200 μm of the X-axis direction displacement stroke. It can be seen from the figure that Cx1 and Cx2 show opposite change trends. Figure 6 is a schematic diagram of the corresponding relationship between the X-axis direction displacement and the differential capacitance signal Cx. It can be seen from the figure that within the range of ±100 microns of the X-axis direction displacement stroke, the differential capacitance signal Cx has good linearity, and for the stroke outside ±100 μm, linearity correction can also be achieved through subsequent compensation. Therefore, based on the differential capacitance signal in the X-axis direction, the detection of the X-axis direction displacement can be accurately realized. Similarly, for the differential capacitance signal in the Y-axis direction, the detection of the Y-axis direction displacement can also be accurately realized.

[0052] In addition, in order to control the detection process of the jitter direction displacement, the corresponding capacitive position detection unit only changes in the distance parameter, and the facing area parameter does not change. It is necessary to control that during the movement of the second mover in the jitter direction, the positive projection of the first floating plate towards the first emitting plate always completely falls on the first emitting plate, and the positive projection of the second floating plate towards the first receiving plate always completely falls on the first receiving plate. Such a control method of parameter variables is beneficial to the linearity of the differential capacitance signal. When the jitter direction includes the X-axis direction and the Y-axis direction, and there are corresponding X-axis capacitive position detection units and Y-axis capacitive position detection units in the X-axis direction and the Y-axis direction respectively. In order to avoid the movement in the X-axis direction affecting the Y-axis capacitive position detection unit and avoid the movement in the Y-axis direction affecting the X-axis capacitive position detection unit, it is necessary to consider the size relationship between multiple plates forming the same capacitor when designing the plates. Taking the sizes of the plates in the X-axis capacitive position detection unit as an example, the following is an explanation:

[0053] Assume that in the initial position of the ball screw anti-shake motor (the displacements in the X-axis, Y-axis, and Z-axis directions are all 0), the states of the X-axis emitting plate 511, the X-axis receiving plate 521, the first X-axis floating plate 531, and the second X-axis floating plate 541 are as Figure 7 shown. The distance between the upper edge of the first X-axis floating plate 531 and the upper edge of the X-axis emitting plate 511 is c1, the distance between the lower edge of the first X-axis floating plate 531 and the lower edge of the X-axis emitting plate 511 is c3, the distance between the upper edge of the second X-axis floating plate 541 and the upper edge of the X-axis receiving plate 521 is e1, and the distance between the lower edge of the second X-axis floating plate 541 and the lower edge of the X-axis receiving plate 521 is e3. Among them, both c1 and e1 are greater than the upward movement stroke of the first mover in the initial position, and both c3 and e3 are greater than the downward movement stroke of the first mover in the initial position. If the initial position is the middle position of the first mover's stroke, then both c1, e1, c3, and e3 are greater than 1 / 2 of the stroke of the first mover in the focusing direction. In addition, the distance between the left edge of the first X-axis floating plate 531 and the left edge of the X-axis emitting plate 511 is c2, the distance between the right edge of the first X-axis floating plate 531 and the right edge of the X-axis emitting plate 511 is c4, the distance between the left edge of the second X-axis floating plate 541 and the left edge of the X-axis receiving plate 521 is e4, and the distance between the right edge of the second X-axis floating plate 541 and the right edge of the X-axis receiving plate 521 is e2. Among them, both c2 and e4 are greater than the rightward movement stroke of the second mover in the initial position, and both c4 and e2 are greater than the rightward movement stroke of the second mover in the initial position. If the initial position is the middle position of the second mover's left and right movement stroke, then both c2, e4, c4, and e2 are greater than 1 / 2 of the stroke of the second mover in the left and right directions. Figure 7The up-down direction shown is the Z-axis direction, and the left-right direction is the Y-axis direction.

[0054] In addition, in order to ensure the signal quantity emitted by the X-axis emission electrode plate 511, the facing area between the X-axis emission electrode plate 511 and the first X-axis floating electrode plate 531 needs to be larger than the facing area between the X-axis receiving electrode plate 521 and the second X-axis floating electrode plate 541.

[0055] Similarly, regarding the size design of the Y-axis emission electrode plate 512, Y-axis receiving electrode plate 522, first Y-axis floating electrode plate 532, and second Y-axis floating electrode plate 542 in the Y-axis direction capacitive position detection unit, the influence of movement in different directions on the capacitive signal and the signal quantity of the Y-axis emission electrode plate also need to be considered. The size design rules are similar and will not be elaborated here.

[0056] In addition, as Figure 3 shown, the ball-type anti-shake motor further includes: a second emission electrode plate 61 and a second receiving electrode plate 62 disposed on the circuit board, and a third floating electrode plate 63 disposed on the first mover 31 and oppositely disposed to both the second emission electrode plate 61 and the second receiving electrode plate 62 in the jitter direction; when the first mover 31 moves in the focusing direction, the capacitance value generated by the capacitance formed by the second emission electrode plate 61, the second receiving electrode plate 62, and the third floating electrode plate 63 determines the moving distance of the first mover 31 in the focusing direction.

[0057] As Figure 4 shown, the number of the second receiving electrode plates 62 can be two; the two second receiving electrode plates 62 are arranged in sequence in the focusing direction. When the first mover 31 moves in the focusing direction, the first change amount of the facing area between the third floating electrode plate 63 and one of the second receiving electrode plates 62 is equal to the second change amount of the facing area between the third floating electrode plate 63 and the other second receiving electrode plate 62; when the first mover 31 moves in the focusing direction, the facing area between the third floating electrode plate 63 and the second emission electrode plate 61 does not change. The capacitance formed by the third floating electrode plate 63 and one of the second receiving electrode plates 62 and the capacitance formed by the third floating electrode plate 63 and the other second receiving electrode plate 62 are used for differential calculation to perform processing such as correcting or denoising the capacitive signal, eliminating the noise that affects the accuracy of the calculation result caused by environmental factors or human operation factors, etc., and at the same time improving the sensitivity of the control of the lens position movement. The differential calculation method is similar to the differential calculation method in the previous jitter direction and will not be repeated here.

[0058] In addition, in order to improve the accuracy of displacement detection, it is mentioned in the previous embodiments that two sets of X-axis detection units and two sets of Y-axis detection units can be provided. Each set of detection units is respectively provided on the surfaces of the four sides of the motor. At the same time, the detection unit in the Z-axis direction can be arbitrarily set on the surface of one side of the motor. When the first transmitting electrode plate, the second transmitting electrode plate, the first receiving electrode plate, and the second receiving electrode plate are all provided on the same plane of the circuit board, the second transmitting electrode plate and the second receiving electrode plate are clamped between the first transmitting electrode plate and the first receiving electrode plate. In addition, as Figures 3 to 4 shown, the detection unit in the Z-axis direction and one set of detection units in the X-axis direction are jointly provided on the surface of the same side of the motor. In order to reduce the occupation of the surface of the motor side, it can be considered to combine the respective transmitting electrode plates in the X-axis detection unit and the Z-axis detection unit into one, that is, the first transmitting electrode plate 51 and the second transmitting electrode plate 61 are integrally formed as a common transmitting electrode plate ( Figure 3 shown is that the X-axis transmitting electrode plate 511 and the second transmitting electrode plate 61 are integrally formed as a common transmitting electrode plate); the first positive projection area of the first floating electrode plate facing the common transmitting electrode plate does not overlap with the second positive projection area of the third floating electrode plate facing the common transmitting electrode plate. The common transmitting electrode plate serves as the signal transmitting end and can simultaneously transmit the same electrical signal to the first floating electrode plate and the third floating electrode plate without causing interference between the two sets of detection units.

[0059] As Figure 8As shown in the figure, it is a schematic diagram of the relevant parameters of the third floating electrode plate 63, the second emitting electrode plate 61, and the second receiving electrode plate 62. During the movement of the first mover in the focusing direction, the facing area between the second emitting electrode plate 61 and the third floating electrode plate 63 always remains unchanged, and only the facing area between the second receiving electrode plate 62 and the third floating electrode plate 63 changes. At the same time, the distances between the third floating electrode plate 63 and the second emitting electrode plate 61 and the second receiving electrode plate 62 respectively do not change. That is, only controlling the change in the facing area between the second receiving electrode plate 62 and the third floating electrode plate 63 affects the change in the capacitance signal. In order to ensure that during the movement in the focusing direction, the third floating electrode plate 63, the second emitting electrode plate 61, and the second receiving electrode plate 62 can always maintain the above capacitance signal change rule, it is necessary to ensure that during the movement in the focusing direction, the upper edge of the third floating electrode plate 63 never exceeds the upper edges of the second emitting electrode plate 61 and one of the second receiving electrode plates 62, and the lower edge of the third floating electrode plate 63 never exceeds the lower edges of the second emitting electrode plate 61 and the other second receiving electrode plate 62. That is, a1 and b1 are greater than the upward movement stroke of the first mover at the initial position. Among them, a1 represents the distance between the upper edge of the third floating electrode plate 63 and the upper edge of the second emitting electrode plate 61, and b1 represents the distance between the upper edge of the third floating electrode plate 63 and the upper edge of one of the second receiving electrode plates 62 arranged at a relatively upper position. a2 and b2 are greater than the downward movement stroke of the first mover at the initial position. Among them, a2 represents the distance between the lower edge of the third floating electrode plate 63 and the lower edge of the second emitting electrode plate 61, and b1 represents the distance between the lower edge of the third floating electrode plate 63 and the lower edge of the other second receiving electrode plate 62 arranged at a relatively lower position. Figure 8 The up and down directions shown are the Z-axis directions.

[0060] In addition, as Figure 3 shown, the ball-type anti-shake motor includes a driving unit, which includes a first driving magnet 104 arranged on the first mover and a first driving coil 103 arranged on the base. The first driving magnet 104 and the first driving coil 103 are arranged opposite to each other and are used to drive the first mover to move in the focusing direction. The first driving magnet 104 forms a fixed magnetic field. The first driving coil 103 is connected to the circuit board and is powered and controlled through an external circuit and an IC. After the first driving coil 103 is energized, an induced magnetic field is generated, and the interaction between the induced magnetic field and the fixed magnetic field formed by the first driving magnet 104 generates a Lorentz force. Since the first driving coil 103 is fixed on the base 2 and cannot move, the Lorentz force is fed back to the first driving magnet 104. Due to the existence of the first ball, the carrier of the first driving magnet 104, the first mover 31, can move relative to the base, thereby realizing the driving of the first mover. By changing the current in the first driving coil, the magnitude of the Lorentz force can be controlled, and by changing the force received by the first mover, the moving distance can be controlled.

[0061] Similarly, regarding the driving of the second mover, the driving unit includes a second driving magnet disposed on the second mover and a second driving coil disposed on the base. The second driving magnet and the second driving coil are disposed opposite to each other and are used to drive the second mover to move in the jitter direction. The driving principle is the same as that of the driving of the first mover described above. Among them, the second driving coil includes an X-axis driving coil 101 and a Y-axis driving coil 102, and the corresponding second driving magnets include: an X-axis driving magnet and a Y-axis driving magnet. The X-axis driving coil 101 and the X-axis driving magnet are disposed opposite to each other, and the Y-axis driving coil 102 and the Y-axis driving magnet are disposed opposite to each other. The first driving magnet, the first driving coil, the X-axis driving coil 101 and the X-axis driving magnet, and the Y-axis driving coil 102 and the Y-axis driving magnet, the three driving units are respectively located on different side parts of the motor to avoid the mutual influence of the driving magnetic fields and affect the driving effect of the motor.

[0062] To ensure the driving effect of the driving unit, the driving unit is usually disposed at the middle area position on the side part of the motor. As mentioned above, the capacitive detection unit is also disposed on the side part of the motor. When the plane where the first driving magnet is located is between the plane where the first floating plate is located and the plane where the first emitting plate is located, in order to ensure the driving effect of the motor, an avoidance can be made at the setting position of the capacitive detection unit. The first emitting plate and the first receiving plate are respectively located on both sides of the first driving coil. That is, the capacitive detection unit to be disposed on the same side part of the motor as the driving unit is disposed in the side area of the motor side part, and the middle area position is used as the setting position of the driving unit. In this setting method, in order to ensure the stability of the motor structure, different plates of the capacitive detection unit can be respectively disposed on both sides of the driving unit. Another example is taking the capacitive detection unit as the Y-axis detection unit, as Figure 3As shown, the Y-axis emitter plate 512 and the first Y-axis floating plate 532 can be set in the right area of ​​the second driving magnet of the driving unit, and the Y-axis receiving plate 522 and the second Y-axis floating plate 542 can be set in the left area of ​​the second driving magnet of the driving unit. In the two areas where the Y-axis emitter plate 512 and the first Y-axis floating plate 532 are facing each other, and where the Y-axis receiving plate 522 and the second Y-axis floating plate 542 are facing each other, corresponding hollow areas are set on the first mover, and the size of the hollow area is at least larger than the facing area of ​​the Y-axis emitter plate 512 and the first Y-axis floating plate 532 (the facing area of ​​the Y-axis receiving plate 522 and the second Y-axis floating plate 542). Two protrusions are respectively arranged at the corresponding positions of the two hollow areas, and the first floating pole plate (first Y-axis floating pole plate) and the second floating pole plate (second Y-axis floating pole plate) are respectively arranged on a protrusion, and the first floating pole plate (first Y-axis floating pole plate) and the second floating pole plate (second Y-axis floating pole plate) are electrically connected through a wire, and the wire extends along the surface of the protrusion to the side of the second mover, and is arranged in contact with the side of the second mover to ensure the neatness of the wire routing. In addition, although the first floating pole plate, the second floating pole plate and the driving magnet in the driving unit are on the same side, but on different horizontal planes, the first floating pole plate and the second floating pole plate can be integrally formed, and the driving magnet is arranged above or below the integrally formed first floating pole plate and the second floating pole plate. The horizontal plane described here is the plane where the X-axis and the Y-axis are located, and the up and down direction is the Z-axis direction.

[0063] Similarly, when the X-axis detection unit and the Z-axis detection unit are on the same side of the motor, the above-mentioned setting method can also be referred to, and the Z-axis detection unit can be set in the middle area of ​​the motor side, and the X-axis detection unit can be set on both sides of the Z-axis detection unit. When the X-axis detection unit or the Y-axis detection unit is separately set in the two side areas of the motor side, the first floating electrode plate and the second floating electrode plate are connected by a wire. If there is enough space on the second mover, the first floating electrode plate and the second floating electrode plate can also be formed as one piece. It is only necessary to ensure that during the movement of the first mover and the second mover, the facing area of ​​the integrated floating electrode plate and the first emitter electrode plate will not change, and the facing area of ​​the integrated floating electrode plate and the first receiving electrode plate will not change.

[0064] In addition, in order to ensure that the second mover will not be driven by the first mover, the second mover only moves in the shaking direction and does not change in the focusing direction. Figure 1 As shown, the ball-type anti-shake motor further includes: a pressure cover 7 arranged in contact with the second mover 32; the pressure cover 7 abuts against the second mover 32 in the focusing direction to limit the movement of the second mover 32 in the focusing direction.

[0065] In addition, if Figure 1As shown in the figure, the ball-type anti-shake motor further includes a housing 8 covering the periphery of all component structures, and the housing 8 plays a protective role for the internal structure of the ball-type anti-shake motor.

[0066] 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 focusing direction. For example, the second mover 32 is arranged inside the first mover 31, that is, the first mover 31 is a hollow frame structure, and the middle area is used to accommodate the lens. The frame surrounds the outside of the second mover 32. Such a structure enables the second mover 32 to overlap at least partially with the first mover 31 in the focusing direction, which can reduce the thickness of the ball-type anti-shake motor in the focusing direction. Similarly, the base 2 overlaps at least partially with the first mover 31 in the focusing direction, which can also reduce the thickness of the ball-type anti-shake motor in the focusing direction. The circuit board 1 is arranged on the side of the base 2, which is convenient for the electrical connection between the first detection unit and the second detection unit arranged in the ball-type anti-shake motor. The circuit board 1 can be a flexible printed circuit board FPC, which is more convenient to be attached to the outer surface of the base.

[0067] Another feasible embodiment of the present invention relates to an electronic device, including the ball-type anti-shake motor as described above. The ball-type anti-shake motor is used in cooperation with the lens to realize the acquisition of images and automatically calibrate the vibration of the external environment, thereby improving the quality of image acquisition.

[0068] 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 foregoing embodiment. Therefore, it also has the technical effects provided by the foregoing embodiment, which will not be elaborated here.

[0069] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present invention, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present invention.

Claims

1. A ball type anti-shake motor, characterized in that: 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 at the periphery of the second mover, and at least a side portion of the first mover includes a hollow area, and the second mover includes a protruding portion protruding relative to the side portion of the first mover at the hollow area of ​​the first mover; The circuit board is arranged on the side of the base, and the circuit board is arranged on the periphery of the first mover; The protruding portion of the second mover is provided with a first floating electrode plate and a second floating electrode plate electrically connected to each other, the circuit board is provided with a first emitter electrode plate arranged opposite to the first floating electrode plate, and a first receiving electrode plate arranged opposite to the second floating electrode plate, the first floating electrode plate and the first emitter electrode plate are arranged opposite to each other, and the second floating electrode plate and the first receiving electrode plate are arranged opposite to each other; The first floating plate and the first emitting plate form a first capacitor, the second floating plate and the first receiving plate form a second capacitor, and the capacitance value generated by the equivalent capacitance of the first capacitor and the second capacitor in series is used to determine the movement distance of the second mover in the shaking direction.

2. 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 first emitter plate includes: an X-axis emitter plate and a Y-axis emitter plate; The first receiving plate includes: an X-axis receiving plate and a Y-axis receiving plate; The first floating plate includes: a first X-axis floating plate and a first Y-axis floating plate, and the second floating plate includes: a second X-axis floating plate and a second Y-axis floating plate; The first X-axis floating plate and the second X-axis floating plate are arranged on a first side surface of the second mover, the first Y-axis floating plate and the second Y-axis floating plate are arranged on a second side surface of the second mover, and the first side surface and the second side surface are adjacent surfaces; The first X-axis floating plate and the X-axis emitting plate are arranged opposite to each other in the X-axis direction, and the second X-axis floating plate and the X-axis receiving plate are arranged opposite to each other in the X-axis direction, and the moving distance of the second mover in the X-axis direction is determined by using the first X-axis floating plate, the X-axis emitting plate, the second X-axis floating plate and the X-axis receiving plate; The first Y-axis floating plate and the Y-axis emitter plate are arranged opposite to each other in the Y-axis direction, and the second Y-axis floating plate and the Y-axis receiving plate are arranged opposite to each other in the Y-axis direction. The first Y-axis floating plate, the Y-axis emitter plate, the second Y-axis floating plate and the Y-axis receiving plate are used to determine the moving distance of the second mover in the Y-axis direction.

3. The ball type anti-shake motor according to claim 2, characterized in that: The number of each of the first X-axis floating plate, the X-axis emitting plate, the second X-axis floating plate and the X-axis receiving plate used to determine the moving distance of the second mover in the X-axis direction is two, forming two groups of X-axis direction detection units, each group of the X-axis direction detection units includes one of the first X-axis floating plate, the X-axis emitting plate, the second X-axis floating plate and the X-axis receiving plate, and the two groups of the X-axis direction detection units are symmetrically arranged relative to the center axis of the lens of the ball-type anti-shake motor; The number of each of the first Y-axis floating plate, the Y-axis emitting plate, the second Y-axis floating plate and the Y-axis receiving plate used to determine the moving distance of the second mover in the Y-axis direction is two, forming two groups of Y-axis direction detection units, each group of the Y-axis direction detection units includes one first Y-axis floating plate, the Y-axis emitting plate, the second Y-axis floating plate and the Y-axis receiving plate, and the two groups of the Y-axis direction detection units are symmetrically arranged relative to the center axis of the lens of the ball-type anti-shake motor.

4. The ball type anti-shake motor according to claim 1, characterized in that: During the movement of the second mover in the shaking direction, the orthographic projection of the first floating plate toward the first emitter plate always completely falls on the first emitter plate, and the orthographic projection of the second floating plate toward the first receiver plate always completely falls on the first receiver plate.

5. The ball type anti-shake motor according to claim 1, characterized in that: Also includes: A second emitting electrode plate and a second receiving electrode plate are arranged on the circuit board, and a third floating electrode plate is arranged on the first mover and is arranged opposite to the second emitting electrode plate and the second receiving electrode plate in the shaking direction; When the first mover moves along the focusing direction, a capacitance value generated by the capacitor formed by the second emitting plate, the second receiving plate and the third floating plate determines a moving distance of the first mover in the focusing direction.

6. The ball type anti-shake motor according to claim 5, characterized in that: When the first emitting plate, the second emitting plate, the first receiving plate and the second receiving plate are all arranged on the same plane of the circuit board, The second emitter plate and the second receiver plate are sandwiched between the first emitter plate and the first receiver plate.

7. The ball type anti-shake motor according to claim 6, characterized in that: The first emitter plate and the second emitter plate are integrally formed as a common emitter plate; A first orthographic projection area of ​​the first floating plate toward the common emitter plate and a second orthographic projection area of ​​the third floating plate toward the common emitter plate do not overlap with each other.

8. The ball type anti-shake motor according to claim 1, characterized in that: Also includes: Drive unit; The driving unit includes: a first driving magnet arranged on the first mover, and a first driving coil arranged on the base, wherein the first driving magnet and the first driving coil are arranged opposite to each other and are used to drive the first mover to move in the focusing direction.

9. The ball type anti-shake motor according to claim 8, characterized in that: When the plane where the first driving magnet is located is between the plane where the first floating electrode plate is located and the plane where the first emitting electrode plate is located, the first emitting electrode plate and the first receiving electrode plate are respectively located on both sides of the first driving coil.

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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