Camera motor, camera module and electronic equipment

Abstract

The invention provides a camera motor, a camera module and electronic equipment. The camera motor comprises a movable bracket, a fixed bracket, a first fixed polar plate, a second fixed polar plate, a third fixed polar plate and a detection circuit board, the first fixed polar plate is opposite to the conductive structure on the movable bracket to form a first capacitor, the second fixed polar plate is opposite to the conductive structure on the movable bracket to form a second capacitor, and the third fixed polar plate is opposite to the conductive structure on the movable bracket to form a third capacitor; the detection circuit is used for detecting a first series capacitance value of the first capacitor and the second capacitor, a second series capacitance value of the first capacitor and the third capacitor, and a third series capacitance value of the second capacitor and the third capacitor. According to the method, the capacitance values of the first capacitor, the second capacitor and the third capacitor are respectively calculated according to three formulas of the first series capacitance value, the second series capacitance value and the third capacitance value, and finally the moving distance of the optical lens in the focusing direction or the anti-shake direction is determined.

Description

Technical Field

[0001] The present application relates to the field of camera technology, and in particular to a camera motor, a camera module and an electronic device. Background Art

[0002] At present, camera modules usually need to have optical focus and optical image stabilization functions. Among them, optical focus refers to the movement of the optical lens (or optical lens) along the optical axis of the optical system, so that the camera equipment can adjust the focus and obtain a clear image. Optical image stabilization refers to the movement of the optical lens (or optical lens) in a direction perpendicular to the optical axis to compensate for the displacement caused by the shaking of the device during the shooting process, thereby avoiding the phenomenon of image blur caused by the shaking of the device. Therefore, the camera module needs to have an optical lens movement detection function to detect the movement distance of the optical lens during the focusing process or the optical image stabilization process, and realize the closed-loop control process of optical lens movement control-optical lens movement detection.

[0003] In the related art, in order to reduce the cost of the solution for detecting the moving distance of the optical lens, there is a solution that uses a capacitor structure to detect the moving distance of the optical lens, which measures the capacitance value of the capacitor to calculate the change in the spacing / area between the two plates of the capacitor, thereby determining the moving distance of the optical lens. However, this solution requires that one plate of the capacitor be set on a mobile structure (such as a mobile bracket for loading the optical lens), and the other plate be set on a fixed structure (such as a fixed bracket), and the detection circuit needs to electrically connect a mobile plate and a fixed plate at the same time to measure the capacitance value of the capacitor structure, which is very difficult and costly for a miniaturized camera lens (such as a mobile phone camera device). Summary of the invention

[0004] The present application provides a camera motor, a camera module and an electronic device to solve the above technical problems.

[0005] In a first aspect, the present application provides a camera motor, comprising:

[0006] A moving bracket, wherein a driving magnet is arranged on the moving bracket;

[0007] A fixed bracket, on which an electromagnetic coil is provided for driving the driving magnet and driving the movable bracket to move;

[0008] A first fixed electrode plate, a second fixed electrode plate and a third fixed electrode plate, wherein the first fixed electrode plate, the second fixed electrode plate and the third fixed electrode plate are fixed relative to a fixed bracket;

[0009] The first fixed electrode plate and the conductive structure on the movable bracket form a first capacitor, the second fixed electrode plate and the conductive structure on the movable bracket form a second capacitor, and the third fixed electrode plate and the conductive structure on the movable bracket form a third capacitor.

[0010] The conductive structure on the mobile bracket includes a driving magnet and / or a moving plate fixed on the mobile bracket, and the capacitance value of at least one of the first capacitor, the second capacitor and the third capacitor changes with the movement of the mobile bracket;

[0011] A detection circuit board, wherein the detection circuit board has a built-in detection circuit, the detection circuit is electrically connected to the first fixed electrode plate, the detection circuit is electrically connected to the second fixed electrode plate, and the detection circuit is electrically connected to the third fixed electrode plate;

[0012] The detection circuit is used to detect a first series capacitance value of the first capacitor and the second capacitor, a second series capacitance value of the first capacitor and the third capacitor, and a third series capacitance value of the second capacitor and the third capacitor;

[0013] The first series capacitance value, the second series capacitance value, and the third series capacitance value are used to determine the capacitance value of the first capacitor, the capacitance value of the second capacitor, and the capacitance value of the third capacitor.

[0014] In a second aspect, the present application provides a camera module, comprising the camera motor as described in the first aspect.

[0015] In a third aspect, the present application provides an electronic device comprising the camera module as described in the first aspect.

[0016] The present application sets a driving magnet on the mobile bracket, and uses the electromagnetic coil on the fixed bracket to drive the driving magnet and drive the mobile bracket to move. When the optical lens (or optical lens) is installed on the mobile bracket, the optical focus or optical image stabilization function can be realized. At the same time, since the first fixed electrode plate and the conductive structure on the mobile bracket form a first capacitor, the second fixed electrode plate and the conductive structure on the mobile bracket form a second capacitor, and the third fixed electrode plate and the conductive structure on the mobile bracket form a third capacitor, and the detection circuit can detect the first series capacitance value of the first capacitor and the second capacitor, the second series capacitance value of the first capacitor and the third capacitor, and the third series capacitance value of the second capacitor and the third capacitor, then the capacitance value of the first capacitor, the capacitance value of the second capacitor and the third capacitor can be calculated according to the three formulas of the first series capacitance value, the second series capacitance value and the third capacitance value, respectively, and then the moving distance of the optical lens (or optical lens) in the focusing direction or the anti-shake direction can be determined according to the capacitance value of the first capacitor, the capacitance value of the second capacitor and the capacitance value of the third capacitor, and finally the closed-loop control process of optical lens movement control-optical lens movement detection is realized.

[0017] Since the first fixed electrode plate, the second fixed electrode plate and the third fixed electrode plate are fixed relative to the fixed bracket, and the detection circuit board of the present application only needs to be electrically connected to the first fixed electrode plate, the second fixed electrode plate and the third fixed electrode plate, then the detection circuit of the present application is connected to three fixed electrodes, thereby avoiding the need for the detection circuit to be connected to a fixed electrode plate and a movable electrode plate respectively, which ultimately makes the moving distance detection scheme of the optical lens difficult to implement and costly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram showing a moving distance detection scheme of an optical lens in the related art;

[0020] Figure 2 A schematic diagram of assembling a camera motor in an embodiment of the present application is shown;

[0021] Figure 3 An exploded schematic diagram of a camera motor in an embodiment of the present application is shown;

[0022] Figure 4 A circuit diagram of a related capacitor and a detection circuit in an embodiment of the present application is shown;

[0023] Figure 5 Another circuit schematic diagram of the relevant capacitor and detection circuit in the embodiment of the present application is shown;

[0024] Figure 6 A schematic diagram showing a first fixed pole plate, a second fixed pole plate, and a third fixed pole plate in an embodiment of the present application facing the same driving magnet is shown;

[0025] Figure 7 An assembly schematic diagram of a movable bracket, a related fixed pole plate and a related electromagnetic coil in an embodiment of the present application is shown;

[0026] Figure 8 An exploded schematic diagram of a movable bracket, a related fixed pole plate and a related electromagnetic coil in an embodiment of the present application is shown;

[0027] Fig. 9 A projection schematic diagram of the first fixed pole plate, the fourth fixed pole plate and the first driving magnet in the embodiment of the present application is shown;

[0028] Fig.10 A schematic projection diagram of the third fixed electrode plate, the fifth fixed electrode plate and the movable electrode plate in the embodiment of the present application is shown;

[0029] Fig.11 An exploded schematic diagram of a mobile bracket in an embodiment of the present application is shown;

[0030] Fig.12 An equivalent circuit diagram of the relevant capacitor and detection circuit in the embodiment of the present application is shown;

[0031] Fig.13 Another equivalent circuit diagram of the relevant capacitor and the detection circuit in the embodiment of the present application is shown;

[0032] Fig.14 Another equivalent circuit diagram of the relevant capacitor and detection circuit in the embodiment of the present application is shown.

[0033] Among them, 10 movable bracket, 101 first sub-bracket, 1011 first ball groove, 1012 first ball, 102 second sub-bracket, 1021 second ball groove, 1022 second ball, 103 third sub-bracket, 1031 third ball groove, 1032 third ball, 11 driving magnet, 111 first driving magnet, 112 second driving magnet, 113 third driving magnet, 114 movable pole plate, 20 fixed bracket, 21 electromagnetic coil, 211 first electromagnetic coil, 212 second electromagnetic coil, 213 third electromagnetic coil, 30 first fixed pole plate, 40 second fixed pole plate, 50 third fixed pole plate, 60 detection circuit board, 70 fourth fixed pole plate, 80 fifth fixed pole plate. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the invention can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0037] At present, in order to reduce the cost of the moving distance detection solution of the optical lens, there is a solution that uses a capacitor structure to detect the moving distance of the optical lens. It measures the capacitance value of the capacitor to calculate the distance / area between the two plates of the capacitor, thereby determining the moving distance of the optical lens.

[0038] See also Figure 1 , Figure 1 A schematic diagram of a moving distance detection scheme for an optical lens in the related art is shown, wherein the scheme requires that one plate of a capacitor be set on a moving structure (e.g., a moving bracket for loading an optical lens), and the other plate be set on a fixed structure (e.g., a fixed bracket for mounting a moving bracket to make it move), and the detection circuit needs to electrically connect the two plates at the same time, and then the capacitance calculation formula can be obtained;

[0039]

[0040] Among them, C is the capacitance of the capacitor, Q is the charge accumulated in the capacitor, U is the voltage difference between the two plates, ε is the dielectric constant of the medium between the plates, S is the area facing the plates, and d is the distance between the plates.

[0041] When the optical lens drives the plates to move away from or towards each other, the moving distance of the optical lens is:

[0042]

[0043] Where D is the moving distance of the optical lens, and d0 is the spacing before the plates move.

[0044] When the optical lens drives the electrode plate to translate parallel to the length direction of the other electrode plate (assuming the electrode plate is rectangular), the moving distance of the optical lens is:

[0045]

[0046] Among them, s0 is the facing area before the plate moves, and B is the width of the plate.

[0047] It can be seen that the detection circuit needs to be electrically connected to a stationary plate and a moving plate at the same time, and detect the voltage across the capacitor to obtain the moving distance of the optical lens. Therefore, there must be a situation where one plate moves relative to the circuit board with the detection circuit, which is very difficult and costly for a miniaturized camera module (such as a mobile phone camera module).

[0048] To this end, the present application provides a camera motor, a camera module and an electronic device, which are described in detail below.

[0049] First, see Figure 2 as well as Figure 3 , Figure 2 A schematic diagram of assembling a camera motor in an embodiment of the present application is shown. Figure 3 An exploded schematic diagram of a camera motor in an embodiment of the present application is shown, wherein the camera motor includes a movable bracket 10, a fixed bracket 20, a first fixed electrode plate 30, a second fixed electrode plate 40, a third fixed electrode plate 50 and a detection circuit board 60.

[0050] Specifically, the mobile bracket 10 is used to drive the optical lens (or the optical lens loaded with the optical lens) to move relative to the fixed bracket 20, so as to achieve optical focusing and / or optical image stabilization of the optical lens. In some embodiments of the present application, the mobile bracket 10 can be moved along the optical axis direction of the optical lens (such as Figure 2 as well as Figure 3 In some embodiments of the present application, the mobile bracket 10 can move in a direction perpendicular to the optical axis of the optical lens (such as the third axis Z direction shown in FIG. Figure 2 as well as Figure 3 In some embodiments of the present application, the mobile bracket 10 can move along the optical axis direction of the optical lens, and the mobile bracket 10 can move along the optical axis direction perpendicular to the optical axis direction of the optical lens, so that the optical lens performs optical focusing and optical image stabilization.

[0051] In some embodiments of the present application, the mobile bracket 10 is approximately a hollow annular bracket, such as a rectangular bracket or a circular bracket, so that the optical lens can be loaded in the middle of the annular mobile bracket 10, thereby preventing the mobile bracket 10 from covering part of the optical lens and blocking the light incident on the optical lens. It can be understood by those skilled in the art that the mobile bracket 10 can also have other structural forms, as long as the mobile bracket 10 does not affect the propagation of light from the optical lens.

[0052] In some embodiments of the present application, the mobile bracket 10 may be a single bracket. For example, for an embodiment in which the mobile bracket 10 can move along the optical axis direction of the optical lens, the mobile bracket 10 may refer to a focus bracket in a camera motor. For another example, for an embodiment in which the mobile bracket 10 can move along a direction perpendicular to the optical axis of the optical lens, the mobile bracket 10 may refer to an anti-shake bracket in a camera motor.

[0053] In some embodiments of the present application, the mobile bracket 10 can be a combined bracket composed of multiple brackets. For example, for an embodiment in which the mobile bracket 10 can move along the optical axis direction of the optical lens, and the mobile bracket 10 can move along the direction perpendicular to the optical axis of the optical lens, the mobile bracket 10 can also refer to a combined bracket composed of a focusing bracket and an anti-shake bracket, wherein the anti-shake bracket can move relative to the fixed bracket 20 along the direction perpendicular to the optical axis of the optical lens, and the focusing bracket can move relative to the anti-shake bracket along the optical axis direction of the optical lens, then the optical lens loaded on the focusing bracket can be moved relative to the fixed bracket 20 along the optical axis direction of the optical lens. Figure 2 as well as Figure 3 The first axis X, the second axis Y and the third axis Z are shown moving in different directions.

[0054] The mobile bracket 10 is provided with a driving magnet 11, which has magnetism, so that the electromagnetic coil 21 on the fixed bracket 20 generates magnetic force and then drives the driving magnet 11 to drive the mobile bracket 10 to move. In some embodiments of the present application, only one driving magnet 11 can be provided on the mobile bracket 10, as a driving member that drives the mobile bracket 10 to move in a single direction. In some embodiments of the present application, the driving magnets 11 can be arranged in pairs on the mobile bracket 10, for example, the driving magnets 11 are arranged on opposite sides of the mobile bracket 10, so as to provide the mobile bracket 10 with a stable supporting force and a moving driving force through the magnetic force generated by the paired first driving magnets 111. In some embodiments of the present application, a plurality of driving magnets 11 can be provided on the mobile bracket 10, so that the mobile bracket 10 moves along the first axis X, the second axis Y and the third axis Z under the drive of the electromagnetic coil 21.

[0055] It should be noted that the mobile bracket 10 has a conductive structure so that the first pole plate, the second pole plate, and the third pole plate are opposite to the conductive structure on the mobile bracket 10, thereby forming a first capacitor, a second capacitor, and a third capacitor, wherein the conductive structure on the mobile bracket 10 includes a driving magnet 11 and / or a moving pole plate 114 fixed to the mobile bracket 10. For example, when the driving magnet 11 is conductive (for example, the material of the driving magnet 11 is a material with magnetism and conductivity such as neodymium iron boron, ferrite, samarium cobalt, or aluminum nickel cobalt), the first pole plate, the second pole plate, and the third pole plate can be opposite to the driving magnet 11. , thereby forming a first capacitor, a second capacitor and a third capacitor; for another example, when the driving magnet 11 is not conductive, a moving pole plate 114 can be set on the moving bracket 10, and the first pole plate, the second pole plate and the third pole plate can be opposite to the moving pole plate 114, thereby forming a first capacitor, a second capacitor and a third capacitor; for another example, when the driving magnet 11 is conductive and the moving pole plate 114 is also set on the moving bracket 10, the first pole plate and the second pole plate can be opposite to the driving magnet 11, and the third pole plate can be opposite to the moving pole plate 114, thereby forming a first capacitor, a second capacitor and a third capacitor.

[0056] It should be noted that when the first plate, the second plate, and the third plate are opposite to the same conductive structure (e.g., the driving magnet 11), the plates equivalent to the first capacitor, the second capacitor, and the third capacitor fixed on the mobile bracket 10 are electrically connected to each other. At this time, the equivalent schematic diagram of the first capacitor, the second capacitor, and the third capacitor and the detection circuit board 60 is as shown in FIG. Figure 4 As shown; when the first pole plate, the second pole plate, and the third pole plate are opposite to different driving magnets 11 and / or the moving pole plates 114, the different driving magnets 11 and / or the moving pole plates 114 need to be electrically connected through wires or metal wires, which is equivalent to making the first capacitor, the second capacitor, and the third capacitor equivalently fixed on the mobile bracket 10 electrically connected to each other through wires or metal wires. At this time, the equivalent schematic diagram of the first capacitor, the second capacitor, and the third capacitor and the detection circuit board 60 is as shown Figure 5 shown.

[0057] The fixed bracket 20 is used to provide a fixed installation base for the fixed part, and allows the mobile bracket 10 to move relative to the fixed bracket 20. For example, the fixed bracket 20 can provide a fixed installation base for the electromagnetic coil 21, the detection circuit board 60, the first fixed electrode plate 30, the second fixed electrode plate 40, and the third fixed electrode plate 50. In some embodiments of the present application, the fixed bracket 20 is approximately a hollow annular bracket in the middle, such as a rectangular bracket or a circular bracket, so as to avoid the fixed bracket 20 covering part of the optical lens and blocking the light incident on the optical lens.

[0058] Those skilled in the art will appreciate that the fixing bracket 20 may also have other structural forms, as long as the fixing bracket 20 does not affect the light propagation of the optical lens.

[0059] After being energized, the electromagnetic coil 21 can generate a magnetic force that repels or attracts the driving magnet 11, thereby driving the driving magnet 11 to drive the mobile bracket 10 to move. In some embodiments of the present application, the first electromagnetic coil 211 can drive the driving magnet 11 to drive the mobile bracket 10 to move along the optical axis direction, so as to achieve the focus adjustment of the optical lens. In some embodiments of the present application, the electromagnetic coil 21 can drive the first driving magnet 111 to drive the mobile bracket 10 to move in a direction perpendicular to the optical axis, so as to achieve optical image stabilization of the optical lens.

[0060] It can be understood that one or more electromagnetic coils 21 can be provided, and the driving magnet 11 is driven by one or more electromagnetic coils 21 to drive the movable bracket 10 to move. The number of electromagnetic coils 21 is not specifically limited in this application.

[0061] In some embodiments of the present application, the electromagnetic coil 21 may be located in the detection circuit board 60, which can facilitate the power supply to the electromagnetic coil 21 and simplify the preparation and assembly (e.g., installation, wiring, etc.) process of the camera motor. It is understandable that the electromagnetic coil 21 may also be fixed to the side of the detection circuit board 60 facing the movable bracket 10, or the electromagnetic coil 21 may also be fixed to the fixed bracket 20.

[0062] The first fixed electrode plate 30, the second fixed electrode plate 40 and the third fixed electrode plate 50 are fixed relative to the fixed bracket 20, the first fixed electrode plate 30 and the conductive structure on the movable bracket 10 form a first capacitor relative to each other, the second fixed electrode plate 40 and the conductive structure on the movable bracket 10 form a second capacitor relative to each other, and the third fixed electrode plate 50 and the conductive structure on the movable bracket 10 form a third capacitor relative to each other, so that the detection circuit can detect the first series capacitance value of the first capacitor and the second capacitor, the second series capacitance value of the first capacitor and the third capacitor, and the third series capacitance value of the second capacitor and the third capacitor, and finally calculate the moving distance of the optical lens along the optical axis and / or the moving distance of the optical lens along the direction perpendicular to the optical axis.

[0063] In some embodiments of the present application, for example, for an embodiment in which only one driving magnet 11 is provided on the mobile bracket 10, the first fixed pole plate 30, the second fixed pole plate 40 and the third fixed pole plate 50 can be directly opposite to the same driving magnet 11, so as to form a first capacitor, a second capacitor and a third capacitor connected in series. In some other embodiments of the present application, for example, for an embodiment in which a driving magnet 11 and a moving pole plate 114 are provided on the mobile bracket 10, the first fixed pole plate 30, the second fixed pole plate 40 and the third fixed pole plate 50 can be directly opposite to different driving magnets 11 and moving pole plates 114, respectively. After the driving magnet 11 and the moving pole plate 114 on the mobile bracket 10 are electrically connected to each other, the first capacitor, the second capacitor and the third capacitor connected in series can be formed.

[0064] In some embodiments of the present application, the first fixed electrode plate 30, the second fixed electrode plate 40 and the third fixed electrode plate 50 can be located in the detection circuit board 60, which can facilitate the electrical connection between the detection circuit and the first fixed electrode plate 30, the second fixed electrode plate 40 and the third fixed electrode plate 50, and can also simplify the preparation and assembly process of the camera motor. Figure 3 As shown, the first fixed electrode plate 30, the second fixed electrode plate 40 and the third fixed electrode plate 50 can all be fixed on the fixed bracket 20. It is only necessary to electrically connect the detection circuit to the first fixed electrode plate 30, the detection circuit to the second fixed electrode plate 40, and the detection circuit to the third fixed electrode plate 50.

[0065] A detection circuit is disposed inside the detection circuit board 60, and the detection circuit is used to detect a first series capacitance value of the first capacitor and the second capacitor, a second series capacitance value of the first capacitor and the third capacitor, and a third series capacitance value of the second capacitor and the third capacitor.

[0066] In some embodiments of the present application, the detection circuit can inject charges into two of the first fixed electrode 30, the second fixed electrode 40 and the third fixed electrode 50 when measuring the series capacitance value (the first series capacitance value, the second series capacitance value or the third series capacitance value), and then measure the voltage of the two injected charges. According to the capacitance calculation formula C=Q / U, the series capacitance value can be determined when the charge amount is known.

[0067] For example, in Figure 4 In the embodiment, the detection circuit can first inject positive charges of a first preset charge amount into the first fixed electrode 30, and inject negative charges of a first preset charge amount into the second fixed electrode 40. Since the first capacitor is connected in series with the second capacitor, after measuring the voltage difference between the first fixed electrode 30 and the second fixed electrode 40, the first series capacitance value of the first capacitor and the second capacitor can be measured at this time:

[0068] Cx=Qx / Ux

[0069] Wherein, Cx is the first series capacitance value, Qx is the first preset charge, and Ux is the voltage difference between the first fixed electrode 30 and the second fixed electrode 40 .

[0070] Similarly, in Figure 4 In the embodiment, after measuring the first series capacitance value, the detection circuit can inject a positive charge of a second preset charge amount into the first fixed electrode 30, and inject a negative charge of a second preset charge amount into the third fixed electrode 50. Since the first capacitor is connected in series with the third capacitor, after measuring the voltage difference between the first fixed electrode 30 and the third fixed electrode 50, the second series capacitance value of the first capacitor and the third capacitor can be measured as follows:

[0071] Cy=Qy / Uy

[0072] Wherein, Cy is the second series capacitance value, Qy is the second preset charge, and Uy is the voltage difference between the first fixed electrode 30 and the third fixed electrode 50 .

[0073] Similarly, in Figure 4 In the embodiment, after measuring the second series capacitance value, the detection circuit can inject a third preset charge amount of positive charge into the second fixed electrode 40, and inject a third preset charge amount of negative charge into the third fixed electrode 50. Since the second capacitor is connected in series with the third capacitor, after measuring the voltage difference between the second fixed electrode 40 and the third fixed electrode 50, the third series capacitance value of the second capacitor and the third capacitor can be measured as follows:

[0074] Cz=Qz / Uz

[0075] Wherein, Cz is the third series capacitance value, Qz is the third preset charge, and Uz is the voltage difference between the second fixed electrode 40 and the third fixed electrode 50 .

[0076] It can be understood that the detection circuit can also control the voltage of two of the first fixed electrode 30, the second fixed electrode 40 and the third fixed electrode 50 when measuring the series capacitance value (the first series capacitance value, the second series capacitance value or the third series capacitance value), and then measure the charge of the two controlled voltages. According to the capacitance calculation formula C=Q / U, when the voltage is known and the charge is measured, the series capacitance value can also be determined.

[0077] In an embodiment of the present application, the first series capacitance value, the second series capacitance value and the third series capacitance value are used to determine the capacitance value of the first capacitor, the capacitance value of the second capacitor and the capacitance value of the third capacitor. Since the capacitance value of at least one of the first capacitor, the second capacitor and the third capacitor changes with the movement of the mobile bracket 10, after determining the capacitance value of the first capacitor, the capacitance value of the second capacitor and the capacitance value of the third capacitor, the moving distance of the mobile bracket 10 can be determined according to the capacitance calculation formula C=εS / 4πkd.

[0078] For example, the first series capacitance value of the first capacitor and the second capacitor, the second series capacitance value of the first capacitor and the third capacitor, and the third series capacitance value of the second capacitor and the third capacitor can be calculated according to the following formulas:

[0079] 1 / Cx=1 / C1+1 / C2

[0080] 1 / Cy=1 / C1+1 / C3

[0081] 1 / Cz=1 / C2+1 / C3

[0082] Wherein, C1 is the capacitance value of the first capacitor, C2 is the capacitance value of the second capacitor, and C3 is the capacitance value of the third capacitor.

[0083] It can be seen that Cx, Cy, and Cz are known quantities obtained by measurement. There are only three unknowns, C1, C2, and C3, in the above three formulas. Therefore, the capacitance values ​​of the first capacitor, the second capacitor, and the third capacitor can be calculated by combining the three formulas:

[0084]

[0085] Assuming that the area of ​​the plates of the first capacitor remains unchanged, and the distance between the plates of the first capacitor changes as the movable bracket 10 moves along the first axis X direction, the distance between the plates of the first capacitor can be calculated according to the following formula:

[0086]

[0087] Wherein, S1 is the area of ​​the plates facing each other of the first capacitor, and d1 is the distance between the plates of the first capacitor.

[0088] It can be seen that since the plate spacing of the first capacitor changes as the movable bracket 10 moves along the first axis X direction, the moving distance of the movable bracket 10 along the first axis X direction can be determined by solving the above formula to obtain the plate spacing of the first capacitor.

[0089] Similarly, assuming that the facing areas of the plates of the second capacitor and the third capacitor remain unchanged, and the plate spacing of the second capacitor changes as the mobile bracket 10 moves along the second axis Y direction, and the plate spacing of the third capacitor changes as the mobile bracket 10 moves along the third axis Z direction, then the moving distance of the mobile bracket 10 along the first axis X and the second axis Y direction can be determined by the same logic.

[0090] It can be understood that the above embodiment is an illustrative description in which the area facing each other of the capacitor plates remains unchanged and the moving distance of the mobile bracket 10 is determined according to the change in the distance between the capacitor plates. In fact, the plates can be arranged so that the distance between the capacitor plates remains unchanged and the moving distance of the mobile bracket 10 can be determined according to the change in the area facing each other of the capacitor plates.

[0091] Therefore, in the embodiment of the present application, the present application sets a driving magnet 11 on the mobile bracket 10, and utilizes the electromagnetic coil 21 on the fixed bracket 20 to drive the driving magnet 11 and drive the mobile bracket 10 to move. When the optical lens (or optical lens) is installed on the mobile bracket 10, the optical focus or optical image stabilization function can be realized. At the same time, since the first fixed electrode 30 and the conductive structure on the movable bracket 10 form a first capacitor relative to each other, the second fixed electrode 40 and the conductive structure on the movable bracket 10 form a second capacitor relative to each other, and the third fixed electrode 50 and the conductive structure on the movable bracket 10 form a third capacitor relative to each other, and the detection circuit can detect the first series capacitance value of the first capacitor and the second capacitor, the second series capacitance value of the first capacitor and the third capacitor, and the third series capacitance value of the second capacitor and the third capacitor, then the capacitance value of the first capacitor, the capacitance value of the second capacitor and the capacitance value of the third capacitor can be calculated respectively according to three formulas based on the first series capacitance value, the second series capacitance value and the third capacitance value, and then the moving distance of the optical lens (or optical lens) in the focusing direction or the anti-shake direction can be determined according to the capacitance value of the first capacitor, the capacitance value of the second capacitor and the capacitance value of the third capacitor, and finally the closed-loop control process of optical lens movement control-optical lens movement detection is realized.

[0092] Since the first fixed electrode plate 30, the second fixed electrode plate 40 and the third fixed electrode plate 50 are fixed relative to the fixed bracket 20, and the detection circuit board 60 of the present application only needs to be electrically connected to the first fixed electrode plate 30, the second fixed electrode plate 40 and the third fixed electrode plate 50, then the detection circuit of the present application is connected to three fixed electrodes, thereby avoiding the need for the detection circuit to be connected to a fixed electrode plate and a movable electrode plate respectively, which ultimately makes the moving distance detection scheme of the optical lens difficult to implement and costly.

[0093] In some embodiments of the present application, see Figure 2 as well as Figure 3, wherein the conductive structure on the mobile bracket 10 includes a first driving magnet 111, a second driving magnet 112 and a moving pole plate 114; the first driving magnet 111, the second driving magnet 112 and the moving pole plate 114 are electrically connected to each other, the first fixed pole plate 30 and the first driving magnet 111 are opposite to form a first capacitor, the second fixed pole plate 40 and the second driving magnet 112 are opposite to form a second capacitor, and the third fixed pole plate 50 and the moving pole plate 114 are opposite to form a third capacitor. In other words, the first fixed pole plate 30, the second fixed pole plate 40 and the third fixed pole plate 50 can be opposite to different conductive structures on the mobile bracket 10, thereby forming a first capacitor, a second capacitor and a third capacitor.

[0094] It can be understood that in some possible embodiments, the conductive structure on the mobile bracket 10 may also include a first driving magnet 111 and a moving pole plate 114, the first fixed pole plate 30, the second fixed pole plate 40 and the first driving magnet 111 form a first capacitor and a second capacitor relative to each other, and the third fixed pole plate 50 and the moving pole plate 114 form a third capacitor relative to each other. After the first driving magnet 111 and the moving pole plate 114 are electrically connected, the first series capacitance value, the second series capacitance value and the third series capacitance value can be measured by a measuring circuit; or, the first fixed pole plate 30, the second fixed pole plate 40 and the moving pole plate 114 form a first capacitor and a second capacitor relative to each other, and the third fixed pole plate 50 and the first driving magnet 111 form a third capacitor relative to each other. After the first driving magnet 111 and the moving pole plate 114 are electrically connected, the first series capacitance value, the second series capacitance value and the third series capacitance value can be measured by a measuring circuit.

[0095] In some embodiments of the present application, a first electromagnetic coil 211 and a second electromagnetic coil 212 are provided on the fixed bracket 20; the first electromagnetic coil 211 is used to drive the first driving magnet 111 and drive the movable bracket 10 to move along the first axis X direction, and the second electromagnetic coil 212 is used to drive the second driving magnet 112 and drive the movable bracket 10 to move along the second axis Y direction; the capacitance value of the first capacitor changes as the movable bracket 10 moves along the first axis X direction, and the capacitance value of the second capacitor changes as the movable bracket 10 moves along the second axis Y direction.

[0096] For example, continue to see Figure 3The first driving magnet 111 is arranged on a side of the movable bracket 10 perpendicular to the first axis X, and the first electromagnetic coil 211 is opposite to the first driving magnet 111. Therefore, the first electromagnetic coil 211 can drive the first driving magnet 111 and drive the movable bracket 10 to move along the first axis X line direction. At this time, the first fixed pole plate 30 and the first driving magnet 111 are close to or away from each other, so that the capacitance value of the first capacitor changes as the movable bracket 10 moves along the first axis X line direction; the second driving magnet 112 is arranged on a side of the movable bracket 10 perpendicular to the second axis Y, and the second electromagnetic coil 212 is opposite to the second driving magnet 112. At this time, the first fixed pole plate 30 and the first driving magnet 111 are close to or away from each other, so that the capacitance value of the second capacitor changes as the movable bracket 10 moves along the second axis Y line direction.

[0097] Understandably, when Figure 3 As only a specific exemplary embodiment of the first fixed pole plate 30, the second fixed pole plate 40, the third fixed pole plate 50, the first driving magnet 111, the second driving magnet 112, the first electromagnetic coil 211, and the second electromagnetic coil 212 of the present application, those skilled in the art can make equivalent modification designs to the positions of the above-mentioned parts under the guidance of the present application. For example, the first fixed pole plate 30 and the third fixed pole plate 50 are set on the same side, and the first fixed pole plate 30 and the third fixed pole plate 50 are both facing the first driving magnet 111; for another example, the movable pole plate 114 is set at the bottom of the movable bracket 10, so that the third fixed pole plate 50 is set at the bottom of the fixed bracket 20 and opposite to the movable pole plate 114, thereby forming a third capacitor.

[0098] In some embodiments of the present application, during the movement of the mobile bracket 10 , the capacitance value of the third capacitor remains unchanged.

[0099] For example, assuming that the area of ​​the plates facing each other and the distance between the plates of the third capacitor remain unchanged, according to the above content, Figure 3 When the movable bracket 10 moves along the first axis X direction, the capacitance values ​​of the first capacitor and the third capacitor can be calculated according to the following formula:

[0100]

[0101] Therefore, the capacitance ratio of the first capacitor to the third capacitor can be calculated according to the following formula:

[0102]

[0103] Therefore, the plate spacing of the first capacitor can be calculated according to the following formula:

[0104]

[0105] In the above formula, S1, d3, and S3 are all constant and known quantities during the movement of the mobile bracket 10. Therefore, after measuring the first series capacitance value Cx, the second series capacitance value Cy, and the third series capacitance value Cz, the plate spacing of the first capacitor can be calculated, and the moving position of the mobile bracket 10 can be finally determined. At the same time, because in the above formula, the parameter of the dielectric constant is eliminated by the capacitance ratio of the first capacitor to the third capacitor, when the dielectric constant of the capacitor changes due to changes in the environment in which the capacitor is located (such as temperature changes), it will not cause errors in the detection of the moving position of the mobile bracket 10, and finally improve the robustness of the detection scheme.

[0106] In some embodiments of the present application, during the movement of the mobile bracket 10 , the second series capacitance value of the first capacitor and the third capacitor remains unchanged.

[0107] For example, see Figure 3 The first fixed electrode plate 30 and the third fixed electrode plate 50 are respectively located on opposite sides of the mobile bracket 10, the plane where the first fixed electrode plate 30 is located is perpendicular to the first axis X, the plane where the second fixed electrode plate 40 is located is perpendicular to the second axis Y, and the plane where the third fixed electrode plate 50 is located is perpendicular to the first axis X. Then, during the movement of the mobile bracket 10, the electrode plate facing area of ​​the first capacitor, the electrode plate facing area of ​​the second capacitor, and the electrode plate facing area of ​​the third capacitor remain unchanged, and the sum of the electrode plate spacing of the first capacitor and the electrode plate spacing of the third capacitor remains unchanged. Therefore, during the movement of the mobile bracket 10, the second series capacitance value of the first capacitor and the third capacitor can be kept unchanged.

[0108] by Figure 3 For example, the second series capacitance value of the first capacitor and the third capacitor remains unchanged (reference capacitance value) and can be calculated according to the following formula:

[0109]

[0110] Wherein, d0 is the sum of the plate distances between the first capacitor and the third capacitor.

[0111] Then, the capacitance ratio of the first capacitance value to the second series capacitance value and the capacitance ratio of the second capacitance value to the second series capacitance value can be calculated according to the following formula:

[0112]

[0113] Therefore, the plate spacing of the first capacitor and the plate spacing of the second capacitor can be calculated according to the following formula:

[0114]

[0115] Wherein, d2 is the distance between the plates of the second capacitor 20 , and S2 is the area of ​​the plates facing each other of the second capacitor 20 .

[0116] In the above formula, S1, S2, and d0 are all known quantities that remain unchanged during the movement of the mobile bracket 10. Therefore, after measuring the first series capacitance value Cx, the second series capacitance value Cy, and the third series capacitance value Cz, the plate spacing of the first capacitor and the second capacitor can be calculated, and finally the moving position of the mobile bracket 10 in the plane coordinate system constructed by the first axis X line and the second axis Y line can be determined. At the same time, because the parameter of the dielectric constant is eliminated by the capacitance ratio in the above formula, the change of the environment in which the capacitor is located (such as temperature change) causes the dielectric constant of the capacitor to change, and will not cause errors in the detection of the moving position of the mobile bracket 10, and finally improve the robustness of the detection scheme.

[0117] It can be understood that in some possible embodiments, during the movement of the mobile bracket 10, the positions of the first fixed electrode plate 30, the second fixed electrode plate 40, and the third fixed electrode plate 50 can be set, for example Figure 6 As shown, the first fixed pole plate 30, the second fixed pole plate 40, and the third fixed pole plate 50 are all opposite to the same driving magnet 11. When the driving magnet 11 follows the moving bracket 10 to move along the first axis X direction, the pole plate spacing of the first capacitor and the pole plate spacing of the third capacitor remain unchanged, and the sum of the pole plate facing area of ​​the first capacitor and the pole plate facing area of ​​the third capacitor remains unchanged. Ultimately, during the movement of the moving bracket 10, the sum of the capacitance value of the first capacitor and the capacitance value of the third capacitor can be kept unchanged.

[0118] In some embodiments of the present application, see Figure 7 as well as Figure 8 , Figure 7 An assembly diagram of the mobile bracket 10, the related fixed pole plate and the related electromagnetic coil 21 in the embodiment of the present application is shown. Figure 8 An exploded schematic diagram of the mobile bracket 10, the related fixed pole plate and the related electromagnetic coil 21 in the embodiment of the present application is shown, wherein the conductive structure on the mobile bracket 10 also includes a third driving magnet 113, and the fixed bracket 20 is also provided with a third electromagnetic coil 213; the third electromagnetic coil 213 is used to drive the third driving magnet 113 and drive the mobile bracket 10 to move along the third axis Z direction.

[0119] That is to say, when the mobile bracket 10 is provided with a first driving magnet 111, a second driving magnet 112 and a third driving magnet 113, and the fixed bracket 20 is provided with a first electromagnetic coil 211, a second electromagnetic coil 212 and a third electromagnetic coil 213, the first electromagnetic coil 211 can drive the first driving magnet 111 to drive the mobile bracket 10 to move along the first axis X (first axis X) direction, the second electromagnetic coil 212 can drive the second driving magnet 112 to drive the mobile bracket 10 to move along the second axis Y (second axis Y) direction, and the third electromagnetic coil 213 can drive the third driving magnet 113 to drive the mobile bracket 10 to move along the third axis Z (third axis Z) direction, then the mobile bracket 10 can perform three-dimensional movement, the movement of the mobile bracket 10 in the first axis X and the second axis Y directions corresponds to the anti-shake movement of the optical lens, and the movement of the mobile bracket 10 in the third axis Z direction corresponds to the focusing movement of the optical lens, and finally the focusing and optical image stabilization functions of the optical lens are realized at the same time.

[0120] It can be understood that when the optical lens only has the optical image stabilization function, it is only necessary to set the first driving magnet 111, the second driving magnet 112 and the corresponding first electromagnetic coil 211, the second electromagnetic coil 212; when the optical lens only has the optical focusing function, it is only necessary to set the third driving magnet 113 and the corresponding third electromagnetic coil 213. Those skilled in the art can set the corresponding electromagnetic coil 21 and the driving magnet 11 according to the function of the camera motor.

[0121] It should be noted that in Figure 3 The first capacitor, the second capacitor and the third capacitor formed by the first fixed electrode plate 30, the second fixed electrode plate 40 and the third fixed electrode plate 50 are mainly used to detect the moving distance of the mobile bracket 10 along the first axis X and the second axis Y. In order to further detect the moving distance of the mobile bracket 10 along the first axis X, please refer to the following content.

[0122] In some embodiments of the present application, the camera motor also includes a fourth fixed electrode plate 70 and a fifth fixed electrode plate 80; the fourth fixed electrode plate 70 and the fifth fixed electrode plate 80 are fixed relative to the fixed bracket 20, the fourth fixed electrode plate 70 and the conductive structure on the mobile bracket 10 form a fourth capacitor relative to each other, and the fifth fixed electrode plate 80 and the conductive structure on the mobile bracket 10 form a fifth capacitor relative to each other; the detection circuit is electrically connected to the fourth fixed electrode plate 70, and the detection circuit is electrically connected to the fifth fixed electrode plate 80, and the detection circuit is also used to detect a fourth series capacitance value of the fourth capacitor and the fifth capacitor; wherein the capacitance value of the fourth capacitor and the capacitance value of the fifth capacitor change as the mobile bracket 10 moves along the third axis Z direction.

[0123] For example, continue to see Figure 7as well as Figure 8 , the fourth fixed pole plate 70 and the first driving magnet 111 form a fourth capacitor, and the fifth fixed pole plate 80 and the movable pole plate 114 form a fifth capacitor, that is, the fourth fixed pole plate 70 and the fifth fixed pole plate 80 are respectively located on opposite sides of the movable bracket 10, when the movable bracket 10 moves along the first axis X, the second axis Y, and the third axis Z, the sum of the pole plate spacing of the fourth capacitor and the pole plate spacing of the fifth capacitor remains unchanged; when the movable bracket 10 moves along the first axis X and the second axis Y, the pole plate facing area of ​​the fourth capacitor and the pole plate facing area of ​​the fifth capacitor remain unchanged, and the pole plate facing area of ​​the fourth capacitor and the pole plate facing area of ​​the fifth capacitor only change as the movable bracket 10 moves along the third axis Z, so the fourth series capacitance value of the fourth capacitor and the fifth capacitor can be calculated according to the following formula:

[0124] 1 / C0=1 / C4+1 / C5

[0125]

[0126] Among them, C4 is the capacitance value of the fourth capacitor, C5 is the capacitance value of the fifth capacitor, S4 is the area of ​​the plates facing each other of the fourth capacitor, d4 is the distance between the plates of the fourth capacitor, S5 is the area of ​​the plates facing each other of the fifth capacitor, and d5 is the distance between the plates of the fifth capacitor.

[0127] Assuming that during the movement of the mobile bracket 10, S4=S5=S0, according to the above formula, it can be known that:

[0128]

[0129] Since the sum of the plate spacing of the fourth capacitor and the plate spacing of the fifth capacitor remains unchanged during the movement of the mobile bracket 10, the plate facing area of ​​the fourth capacitor and the plate facing area of ​​the fifth capacitor only change as the mobile bracket 10 moves along the third axis Z direction, d4+d5 in the above formula is a known fixed value, and S0 corresponds to the change in the fourth series capacitance value of the fourth capacitor and the fifth capacitor as the mobile bracket 10 moves along the third axis Z direction, so S0 can be calculated according to the following formula:

[0130]

[0131] Wherein, B is the width corresponding to the area directly facing the plates of the fourth capacitor and the fifth capacitor, and L is the length corresponding to the area directly facing the plates of the fourth capacitor and the fifth capacitor.

[0132] Assume that Figure 8 In the above formula, the mobile bracket 10 moves along the third axis Z direction, and only B in the above formula is changed. Therefore, the moving distance of the mobile bracket 10 along the third axis Z direction can be calculated according to the following formula:

[0133]

[0134] It can be seen that when the detection circuit detects the fourth series capacitance value C0 of the fourth capacitor and the fifth capacitor, since d4+d5 and L in the above formula are known fixed quantities during the movement of the mobile bracket 10, the moving distance of the mobile bracket 10 along the third axis Z direction can be determined.

[0135] In some embodiments of the present application, the fourth fixed pole plate 70 can also form a fourth capacitor relative to the third driving magnet 113, and the fifth fixed pole plate 80 can also form a fifth capacitor relative to the third driving magnet 113; during the movement of the mobile bracket 10, the pole plate spacing of the fourth capacitor and the pole plate spacing of the fifth capacitor remain unchanged, and the pole plate facing area of ​​the fourth capacitor and the pole plate facing area of ​​the fifth capacitor only change as the mobile bracket 10 moves along the third axis Z direction. When the detection circuit detects the fourth series capacitance value C0 of the fourth capacitor and the fifth capacitor, then in the above formula, d4, d5, and L are all known fixed quantities, so the moving distance of the mobile bracket 10 along the third axis Z direction can also be determined.

[0136] In some embodiments of the present application, see Fig. 9 , Fig. 9 A projection schematic diagram of the first fixed pole plate 30, the fourth fixed pole plate 70 and the first driving magnet 111 is shown, and the first fixed pole plate 30, the fourth fixed pole plate 70 and the first driving magnet 111 are projected on the plane where the second axis Y and the third axis Z are located, wherein the first fixed pole plate 30 and the fourth fixed pole plate 70 are arranged along the direction of the third axis Z and face the first driving magnet 111, and the width of the first fixed pole plate 30 along the direction of the third axis Z is smaller than the width of the first driving magnet 111 along the direction of the third axis Z, so the first fixed pole plate 30 can form a first capacitor facing the middle of the first driving magnet 111, and the fourth fixed pole plate 70 can form a fourth capacitor facing the edge of the first driving magnet 111.

[0137] See also Fig.10 , Fig.10A projection schematic diagram of the third fixed pole plate 50, the fifth fixed pole plate 80 and the movable pole plate 114 is shown, and the third fixed pole plate 50, the fifth fixed pole plate 80 and the movable pole plate 114 are projected on the plane where the second axis YY and the third axis ZZ are located. The third fixed pole plate 50 and the fifth fixed pole plate 80 are arranged along the third axis Z direction and face the movable pole plate 114, and the width of the third fixed pole plate 50 along the third axis Z direction is smaller than the width of the movable pole plate 114 along the third axis Z direction. Therefore, the third fixed pole plate 50 can form a third capacitor facing the middle of the movable pole plate 114, and the fifth fixed pole plate 80 can form a fifth capacitor facing the edge of the first driving magnet 111.

[0138] When the mobile bracket 10 moves along the first axis X direction, it can be seen that the opposing areas of the plates of the first capacitor and the third capacitor remain unchanged while the distance between the plates changes, and the sum of the distances between the plates of the first capacitor and the third capacitor remains unchanged, the opposing areas of the plates of the fourth capacitor and the fifth capacitor remain unchanged, and the sum of the distances between the plates of the fourth capacitor and the fifth capacitor remains unchanged. Therefore, the first capacitor and the third capacitor can be used to measure the moving distance of the mobile bracket 10 along the first axis X direction.

[0139] When the mobile bracket 10 moves along the second axis Y direction, it can be seen that the plate facing area and the plate spacing of the first capacitor, the third capacitor, the fourth capacitor and the fifth capacitor remain unchanged. Therefore, the movement of the mobile bracket 10 along the second axis Y direction will not change the capacitance values ​​of the above four capacitors, thereby avoiding interference with the detection of the mobile bracket 10 along the first axis X direction and the third axis Z direction.

[0140] When the mobile bracket 10 moves along the third axis Z direction, the plate facing area and plate spacing of the first capacitor and the third capacitor remain unchanged, the plate spacing of the fourth capacitor and the fifth capacitor remains unchanged, but the plate facing area of ​​the fourth capacitor and the fifth capacitor changes. Therefore, the fourth capacitor and the fifth capacitor can be used to measure the moving distance of the mobile bracket 10 along the third axis Z direction.

[0141] Combination Figure 8 , Fig. 9 as well as Fig.10 The above-mentioned arrangement of the first fixed electrode plate 30, the third fixed electrode plate 50, the fourth fixed electrode plate 70, and the fifth fixed electrode plate 80 can form the first capacitor, the third capacitor, the fourth capacitor, and the fifth capacitor to realize the detection of the moving distance of the movable bracket 10 along the first axis X direction and the third axis Z direction, and can also make the camera motor assembly more compact, which is conducive to reducing the size of the camera motor.

[0142] In some embodiments of the present application, see Figure 8, wherein the movable bracket 10 includes a first sub-bracket 101, a second sub-bracket 102 and a third sub-bracket 103; the first sub-bracket 101 is installed on the fixed bracket 20 and can move along the third axis Z direction, the second sub-bracket 102 is installed on the first sub-bracket 101 and can move along the second axis Y direction, the third sub-bracket 103 is installed on the second sub-bracket 102 and can move along the first axis X direction; the first driving magnet 111, the second driving magnet 112 and the moving pole plate 114 are installed on the third sub-bracket 103, and the third driving magnet 113 is installed on the first sub-bracket 101.

[0143] Specifically, when the third electromagnetic coil 213 drives the third driving magnet 113 to drive the first sub-bracket 101 to move along the third axis Z direction on the fixed bracket 20, the corresponding second sub-bracket 102 and the third sub-bracket 103 also move along the third axis Z direction; when the second electromagnetic coil 212 drives the second driving magnet 112, the position of the first sub-bracket 101 remains unchanged, while the second sub-bracket 102 and the third sub-bracket 103 move along the second axis Y direction; and when the first electromagnetic coil 211 drives the first driving magnet 111, the positions of the first sub-bracket 101 and the second sub-bracket 102 remain unchanged, while the third sub-bracket 103 moves along the first axis X direction. It can be seen that when the optical lens (or optical lens) is mounted on the third sub-bracket 103, the three-dimensional movement of the optical lens can be achieved.

[0144] In addition, since the first driving magnet 111, the second driving magnet 112 and the moving pole plate 114 are mounted on the third sub-bracket 103, the Figure 8 , Fig. 9 , Fig.10 Regarding the arrangement of the relevant fixed pole plates, not only can the first capacitor, the third capacitor, the second capacitor, the fourth capacitor and the fifth capacitor be formed to realize the detection of the moving distance of the movable bracket along the first axis X direction, the second axis Y direction and the third axis Z direction, but it is also much easier to realize the electrical connection between the first driving magnet 111, the second driving magnet 112 and the movable pole plate 114 on the same third sub-bracket 103, thereby avoiding the phenomenon that the first driving magnet 111 is installed on the third sub-bracket 103 and the second driving magnet 112 is installed on the second sub-bracket 102, which makes it difficult to electrically connect the first driving magnet 111, the second driving magnet 112 and the movable pole plate 114 to each other.

[0145] It can be understood that the above embodiment splits the mobile bracket 10 into three sub-brackets, and the three sub-brackets are respectively responsible for the movement in the directions of the first axis X, the second axis Y and the third axis Z. In some possible embodiments, the mobile bracket 10 can also be split into two sub-brackets, one of which is responsible for the movement in the directions of the first axis X and the second axis Y, and the other sub-bracket is responsible for the movement in the direction of the third axis Z.

[0146] In some embodiments of the present application, see Fig.11 , Fig.11 An exploded schematic diagram of the mobile bracket 10 in the embodiment of the present application is shown, wherein a first ball groove 1011 arranged along the third axis Z direction is provided on the first sub-bracket 101, the first ball groove 1011 is opposite to the fixed bracket 20, and a first ball 1012 is installed in the first ball groove 1011, and the first ball 1012 can provide support for the movement of the first sub-bracket 101 along the third axis Z direction; a second ball groove 1021 arranged along the second axis Y direction is provided on the second sub-bracket 102, and the second ball groove 1021 is opposite to the fixed bracket 20. The first sub-bracket 101 is opposite, and a second ball 1022 is installed in the second ball groove 1021, and the second ball 1022 can provide support for the movement of the second sub-bracket 102 along the second axis Y direction; the third sub-bracket 103 is provided with a third ball groove 1031 arranged along the first axis X direction, the third ball groove 1031 is opposite to the second sub-bracket 102, and a third ball 1032 is installed in the third ball groove 1031, and the third ball 1032 can provide support for the movement of the third sub-bracket 103 along the first axis X direction.

[0147] It can be understood that in some possible embodiments, other sliding fits, such as slide rails, slide grooves, etc., can also be used between the first sub-bracket 101, the second sub-bracket 102, the third sub-bracket 103, and the fixed bracket 20 to achieve the purpose of the movable bracket 10 driving the optical lens to move in a three-dimensional direction.

[0148] In order to better understand the technical solution of the present application, the present application further explains the detection circuit below. It should be noted that the following contents should not be regarded as limitations on the detection circuit in the claims of the present application.

[0149] In some embodiments of the present application, see Fig.12 , Fig.12Another equivalent circuit schematic diagram of the relevant capacitor and the detection circuit in the embodiment of the present application is shown, wherein the detection circuit includes a switching circuit and a measuring circuit; the first fixed electrode plate 30, the second fixed electrode plate 40, the third fixed electrode plate 50, the fourth fixed electrode plate 70 and the fifth fixed electrode plate 80 are connected to the input end of the switching circuit, and the input end of the measuring circuit is connected to the output end of the switching circuit; the switching circuit is used to conduct the path between any two of the first fixed electrode plate 30, the second fixed electrode plate 40, the third fixed electrode plate 50, the fourth fixed electrode plate 70 and the fifth fixed electrode plate 80 and the measuring circuit, and the measuring circuit is used to detect the series capacitance value of the two capacitors whose paths are conducted to the measuring circuit.

[0150] For example, when the switch circuit connects the path between the first fixed electrode plate 30, the second fixed electrode plate 40 and the measuring circuit, the measuring circuit can detect the first series capacitance value of the first capacitor and the second capacitor; for another example, when the switch circuit connects the path between the first fixed electrode plate 30, the third fixed electrode plate 50 and the measuring circuit, the measuring circuit can detect the second series capacitance value of the first capacitor and the third capacitor; for another example, when the switch circuit connects the path between the second fixed electrode plate 40, the third fixed electrode plate 50 and the measuring circuit, the measuring circuit can detect the third series capacitance value of the second capacitor and the third capacitor; for another example, when the switch circuit connects the path between the fourth fixed electrode plate 70, the fifth fixed electrode plate 80 and the measuring circuit, the measuring circuit can detect the fourth series capacitance value of the fourth capacitor and the fourth capacitor.

[0151] As an example, see Fig.13 , Fig.13 An equivalent circuit diagram of the relevant capacitor and detection circuit in an embodiment of the present application is shown, wherein the switch circuit includes a first control switch Sc1, a second control switch Sc2, a third control switch Sc3, a fourth control switch Sc4, a fifth control switch Sc5, a sixth control switch Sc6, a seventh control switch Sc7 and an eighth control switch Sc8.

[0152] For example, when the first control switch Sc1 and the third control switch Sc3 are closed and the other switches are open, the path between the first fixed electrode 30 and the second fixed electrode 40 and the measurement circuit is connected, so the measurement circuit can measure the first series capacitance of the first capacitor and the second capacitor.

[0153] When the first control switch Sc1 and the fourth control switch Sc4 are closed and the other switches are open, the path between the first fixed electrode 30 and the third fixed electrode 50 and the measurement circuit is connected, so the measurement circuit can measure the second series capacitance value of the first capacitor and the third capacitor.

[0154] When the second control switch Sc2 and the fourth control switch Sc4 are closed and the other switches are open, the path between the second fixed electrode 40 and the third fixed electrode 50 and the measurement circuit is connected, so the measurement circuit can measure the third series capacitance value of the second capacitor and the third capacitor.

[0155] When the sixth control switch Sc6 and the eighth control switch Sc8 are closed and the other switches are open, the path between the fourth fixed electrode 70 and the fifth fixed electrode 80 and the measurement circuit is connected, so the measurement circuit can measure the fourth series capacitance value of the fourth capacitor and the fifth capacitor.

[0156] It can be understood that the above switch circuit is only an exemplary embodiment, and the first control switch Sc1, the second control switch Sc2, the third control switch Sc3, the fourth control switch Sc4, the fifth control switch Sc5, the sixth control switch Sc6, the seventh control switch Sc7 and the eighth control switch Sc8 can be transistors with switch functions such as but not limited to MOS tubes, IGBT tubes, triodes, etc. At the same time, it should be pointed out that the above switch circuit and measurement circuit can be circuits integrated in a dedicated chip (such as a camera chip) or circuits integrated on a circuit board, and this application does not make specific restrictions.

[0157] In some embodiments of the present application, see Fig.14 , Fig.14 Another equivalent circuit diagram of the relevant capacitor and detection circuit in the embodiment of the present application is shown, wherein the measurement circuit includes a fully differential operational amplifier OP, a first charge injection circuit 601 and a second charge injection circuit 602, the first charge injection circuit 601 is configured to inject a first preset amount of first charge into the first input terminal of the fully differential operational amplifier, and the second charge injection circuit 602 is configured to inject a second preset amount of second charge into the second input terminal of the fully differential operational amplifier; the polarity of the first charge is opposite to the polarity of the second charge, and the first preset amount is equal to the second preset amount. The fully differential operational amplifier OP can amplify the voltage difference between the corresponding two fixed plates, so that the analog-to-digital converter can amplify the voltage difference and convert it into a digital signal to achieve voltage measurement.

[0158] For example, when the first control switch Sc1 and the third control switch Sc3 are closed, and the other switches are open, the first charge injection circuit 601 injects a first preset amount of first charge into the first fixed electrode 30, and the second charge injection circuit 602 injects a first preset amount of second charge into the second fixed electrode 40. The first series capacitance value of the first capacitor and the second capacitor can be calculated according to the following formula:

[0159]

[0160] Wherein, k is the signal amplification factor of the fully differential operational amplifier OP, U1 is the output voltage of the fully differential operational amplifier OP, and Q1 is the charge amount of the first preset amount.

[0161] Similarly, the second series capacitance value of the first capacitor and the third capacitor, the third series capacitance value of the second capacitor and the third capacitor, and the fourth series capacitance value of the fourth capacitor and the fifth capacitor are the same and are not described again.

[0162] It can be understood that the above content about the camera motor is intended to clearly illustrate the implementation verification process of the present application. Under the guidance of the present application, those skilled in the art can also make equivalent modified designs. For example, by setting the positions of the first fixed electrode 30, the second fixed electrode 40 and the third fixed electrode 50, the capacitance value of the first capacitor changes with the movement of the mobile bracket 10 along the first axis X direction, the capacitance value of the second capacitor changes with the movement of the mobile bracket 10 along the second axis Y direction, and the capacitance value of the third capacitor changes with the movement of the mobile bracket 10 along the third axis Z direction. Then, after the capacitance values ​​of the first capacitor, the second capacitor and the third capacitor are calculated according to the first series capacitance value, the second series capacitance value and the third series capacitance value, the three-dimensional spatial position of the mobile bracket 10 can be determined according to the capacitance values ​​of the first capacitor, the second capacitor and the third capacitor.

[0163] Furthermore, in order to better implement the camera motor in the embodiment of the present application, on the basis of the camera motor, the present application also provides a camera module, which includes the camera motor of any of the above embodiments. Since the camera module in the embodiment of the present application is provided with the camera motor of the above embodiment, it has all the beneficial effects of the above camera motor, which will not be described in detail here.

[0164] Furthermore, in order to better implement the camera module in the embodiment of the present application, on the basis of the camera module, the present application also provides an electronic device, the electronic device includes a camera module as in any of the above embodiments. Since the electronic device in the embodiment of the present application is provided with the camera motor of the above embodiment, it has all the beneficial effects of the above camera motor, which will not be described in detail here.

[0165] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0166] The above is a detailed introduction to a camera motor, a camera module and an electronic device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A camera motor, characterized in that: include: A movable bracket, wherein a driving magnet is disposed on the movable bracket; A fixed bracket, on which an electromagnetic coil for driving the driving magnet and driving the movable bracket to move is disposed; a first fixed electrode plate, a second fixed electrode plate and a third fixed electrode plate, wherein the first fixed electrode plate, the second fixed electrode plate and the third fixed electrode plate are fixed relative to the fixing bracket; The first fixed electrode plate and the conductive structure on the movable bracket form a first capacitor, the second fixed electrode plate and the conductive structure on the movable bracket form a second capacitor, and the third fixed electrode plate and the conductive structure on the movable bracket form a third capacitor; The conductive structure on the movable bracket includes the driving magnet and / or a movable plate fixed on the movable bracket, and the capacitance value of at least one of the first capacitor, the second capacitor and the third capacitor changes with the movement of the movable bracket; A detection circuit board, wherein the detection circuit board has a built-in detection circuit, the detection circuit is electrically connected to the first fixed electrode plate, the detection circuit is electrically connected to the second fixed electrode plate, and the detection circuit is electrically connected to the third fixed electrode plate; The detection circuit is used to detect a first series capacitance value of the first capacitor and the second capacitor, a second series capacitance value of the first capacitor and the third capacitor, and a third series capacitance value of the second capacitor and the third capacitor; The first series capacitance value, the second series capacitance value, and the third series capacitance value are used to determine the capacitance value of the first capacitor, the capacitance value of the second capacitor, and the capacitance value of the third capacitor.

2. The camera motor according to claim 1, wherein: The conductive structure on the movable bracket includes a first driving magnet, a second driving magnet and a movable pole plate; The first driving magnet, the second driving magnet and the moving pole plate are electrically connected to each other, the first fixed pole plate and the first driving magnet form the first capacitor relative to each other, the second fixed pole plate and the second driving magnet form the second capacitor relative to each other, and the third fixed pole plate and the moving pole plate form the third capacitor relative to each other.

3. The camera motor according to claim 2, wherein: The fixing bracket is provided with a first electromagnetic coil and a second electromagnetic coil; The first electromagnetic coil is used to drive the first driving magnet and drive the movable bracket to move along the first axis direction, and the second electromagnetic coil is used to drive the second driving magnet and drive the movable bracket to move along the second axis direction; The capacitance value of the first capacitor changes as the movable bracket moves along the first axis direction, and the capacitance value of the second capacitor changes as the movable bracket moves along the second axis direction.

4. The camera motor according to claim 3, wherein: During the movement of the mobile bracket, the second series capacitance value of the first capacitor and the third capacitor remains unchanged; or During the movement of the mobile bracket, the sum of the capacitance value of the first capacitor and the capacitance value of the third capacitor remains unchanged; or During the movement of the movable bracket, the capacitance value of the third capacitor remains unchanged.

5. The camera motor according to claim 4, wherein: During the movement of the mobile bracket, the area of ​​the plates of the first capacitor facing each other and the area of ​​the plates of the third capacitor facing each other remain unchanged, and the sum of the distance between the plates of the first capacitor and the distance between the plates of the third capacitor remains unchanged; or During the movement of the mobile bracket, the distance between the plates of the first capacitor and the distance between the plates of the third capacitor remain unchanged, and the sum of the area facing the plates of the first capacitor and the area facing the plates of the third capacitor remains unchanged.

6. The camera motor according to claim 5, wherein: The first driving magnet and the moving pole plate are respectively located on two opposite sides of the moving bracket; The plane where the first fixed electrode plate is located is perpendicular to the first axis, the plane where the second fixed electrode plate is located is perpendicular to the second axis, and the plane where the third fixed electrode plate is located is perpendicular to the first axis; During the movement of the mobile bracket, the area facing the plates of the first capacitor, the area facing the plates of the second capacitor, and the area facing the plates of the third capacitor remain unchanged, and the sum of the plate spacing of the first capacitor and the plate spacing of the third capacitor remains unchanged.

7. The camera motor according to claim 3, wherein: The conductive structure on the movable bracket further includes a third driving magnet, and the fixed bracket is further provided with a third electromagnetic coil; The third electromagnetic coil is used to drive the third driving magnet and drive the movable bracket to move along the third axis direction.

8. The camera motor according to claim 7, wherein: The camera motor further includes a fourth fixed pole plate and a fifth fixed pole plate; The fourth fixed electrode plate and the fifth fixed electrode plate are fixed relative to the fixed bracket, the fourth fixed electrode plate and the conductive structure on the movable bracket are opposite to form a fourth capacitor, and the fifth fixed electrode plate and the conductive structure on the movable bracket are opposite to form a fifth capacitor; The detection circuit is electrically connected to the fourth fixed electrode plate, the detection circuit is electrically connected to the fifth fixed electrode plate, and the detection circuit is further used to detect a fourth series capacitance value of the fourth capacitor and the fifth capacitor; Wherein, the capacitance value of the fourth capacitor and the capacitance value of the fifth capacitor change as the movable bracket moves along the third axis direction.

9. The camera motor according to claim 8, wherein: The fourth fixed pole plate and the first driving magnet are opposite to each other to form the fourth capacitor, and the fifth fixed pole plate and the moving pole plate are opposite to each other to form the fifth capacitor; During the movement of the mobile bracket, the sum of the plate spacing of the fourth capacitor and the plate spacing of the fifth capacitor remains unchanged, and the plate facing area of ​​the fourth capacitor and the plate facing area of ​​the fifth capacitor only change as the mobile bracket moves along the third axis direction.

10. The camera motor according to claim 9, wherein: The first fixed pole plate and the fourth fixed pole plate are arranged along the third axis direction and face the first driving magnet, and the width of the first fixed pole plate along the third axis direction is smaller than the width of the first driving magnet along the third axis direction; The third fixed electrode plate and the fifth fixed electrode plate are arranged along the third axis direction and face the movable electrode plate, and the width of the third fixed electrode plate along the third axis direction is smaller than the width of the movable electrode plate along the third axis direction.

11. The camera motor according to claim 8, wherein: The fourth fixed pole plate and the third driving magnet are opposite to each other to form the fourth capacitor, and the fifth fixed pole plate and the third driving magnet are opposite to each other to form the fifth capacitor; During the movement of the mobile bracket, the plate spacing of the fourth capacitor and the plate spacing of the fifth capacitor remain unchanged, and the plate facing area of ​​the fourth capacitor and the plate facing area of ​​the fifth capacitor only change as the mobile bracket moves along the third axis direction.

12. The camera motor according to claim 7, wherein: The mobile bracket includes a first sub-bracket, a second sub-bracket and a third sub-bracket; The first sub-bracket is mounted on the fixed bracket and can move along the third axis direction, the second sub-bracket is mounted on the first sub-bracket and can move along the second axis direction, and the third sub-bracket is mounted on the second sub-bracket and can move along the first axis direction; The first driving magnet and the second driving magnet are mounted on the third sub-bracket, and the third driving magnet is mounted on the first sub-bracket.

13. The camera motor according to claim 11, wherein: The first sub-bracket is provided with a first ball rolling groove arranged along the third axis direction, the first ball rolling groove is opposite to the fixed bracket, and a first ball is installed in the first ball rolling groove; The second sub-bracket is provided with a second ball rolling groove arranged along the second axis direction, the second ball rolling groove is opposite to the first sub-bracket, and a second ball rolling groove is installed in the second ball rolling groove; The third sub-bracket is provided with a third ball rolling groove arranged along the first axis direction, the third ball rolling groove is opposite to the second sub-bracket, and a third ball is installed in the third ball rolling groove.

14. A camera module, characterized in that: Comprising the camera motor according to any one of claims 1 to 13.

15. An electronic device, characterized in that: Including the camera module as described in claim 14.

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