Camera lens motor, camera module and electronic device

Abstract

The application provides a camera motor, a camera module and an electronic device. The camera motor comprises a moving support, a fixed support, a first fixed plate, a second fixed plate, a third fixed plate and a detection circuit board. The first fixed plate and a conductive structure on the moving support oppositely form a first capacitor. The second fixed plate and the conductive structure on the moving support oppositely form a second capacitor. The third fixed plate and the conductive structure on the moving support oppositely 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 first series capacitance value, the second series capacitance value and the third series capacitance value, three formulas are simultaneously solved, and the capacitance values of the first capacitor, the second capacitor and the third capacitor are respectively calculated. Finally, the moving distance of the optical lens in the focusing direction or the anti-shake direction is determined.

Description

Technical Field

[0001] This application relates to the field of camera technology, specifically to a camera motor, camera module, and electronic device. Background Technology

[0002] Currently, camera modules typically require both optical autofocus and optical image stabilization (OIS). Optical autofocus refers to the movement of optical lenses (or optical mirrors) along the optical axis of the optical system to allow the camera to adjust focus and obtain a clear image. Optical image stabilization compensates for the displacement caused by camera shake during recording by moving optical lenses (or optical mirrors) perpendicular to the optical axis, thus preventing image blurring due to camera shake. Therefore, camera modules need to have optical lens movement detection capabilities to detect the movement distance of the optical lenses during focusing or OIS, achieving a closed-loop control process of optical lens movement control and detection.

[0003] In related technologies, to reduce the cost of optical lens movement distance detection schemes, a method using a capacitor structure to detect the movement distance of an optical lens has been proposed. This method calculates the change in the distance / area between the two plates of the capacitor by measuring the capacitance value, thereby determining the movement distance of the optical lens. However, this method requires one plate of the capacitor to be placed on a moving structure (e.g., a moving bracket that mounts the optical lens), while the other plate is placed on a fixed structure (e.g., a fixed bracket). Furthermore, the detection circuit needs to be electrically connected to both the moving and fixed plates simultaneously to measure the capacitance value of the capacitor structure. This is very difficult and costly for miniaturized camera lenses (e.g., mobile phone camera devices). Summary of the Invention

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

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

[0006] A movable support, on which a driving magnet is installed;

[0007] A fixed bracket is provided with an electromagnetic coil for driving the driving magnet and moving the movable bracket.

[0008] The first fixed electrode plate, the second fixed electrode plate, and the third fixed electrode plate are fixed relative to the fixed bracket.

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

[0010] The conductive structure on the movable support includes a driving magnet and / or a movable electrode plate fixed on the movable support, and the capacitance value of at least one of the first capacitor, the second capacitor and the third capacitor changes as the movable support moves.

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

[0012] The detection circuit is used to 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.

[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] Secondly, this application provides a camera module, including a camera motor as described in the first aspect.

[0015] Thirdly, this application provides an electronic device including a camera module as described in the first aspect.

[0016] This application utilizes a driving magnet mounted on a movable support. An electromagnetic coil on a fixed support drives the driving magnet, causing the movable support to move. When an optical lens (or optical image stabilization lens) is mounted on the movable support, optical focusing or optical image stabilization functions can be achieved. Simultaneously, a first fixed plate and a conductive structure on the movable support form a first capacitor, a second fixed plate and a conductive structure on the movable support form a second capacitor, and a third fixed plate and a conductive structure on the movable support form a third capacitor. A 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. Therefore, by combining these three values ​​into three formulas, the capacitance values ​​of the first capacitor, the second capacitor, and the third capacitor can be calculated. Based on these capacitance values, the moving distance of the optical lens (or optical image stabilization lens) in the focusing or image stabilization direction can be determined, ultimately achieving a closed-loop control process of optical lens movement control and optical lens movement detection.

[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 this application only needs to be electrically connected to the first fixed electrode plate, the second fixed electrode plate, and the third fixed electrode plate, the detection circuit of this application is connected to three fixed electrode plates. This avoids the phenomenon that the detection circuit needs to be connected to a fixed electrode plate and a movable electrode plate respectively, which ultimately leads to the difficulty in realizing the optical lens movement distance detection scheme and the high cost. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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 effort.

[0019] Figure 1 A schematic diagram of a motion distance detection scheme for optical lenses in related technologies is shown;

[0020] Figure 2 This invention illustrates an assembly diagram of a camera motor according to an embodiment of the present application.

[0021] Figure 3 An exploded schematic diagram of a camera motor according to an embodiment of this application is shown;

[0022] Figure 4 This paper shows a circuit diagram of the relevant capacitor and detection circuit in an embodiment of this application;

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

[0024] Figure 6 This illustration shows a schematic diagram of the first fixed pole plate, the second fixed pole plate, and the third fixed pole plate facing the same driving magnet in an embodiment of this application.

[0025] Figure 7 This invention illustrates an assembly diagram of a movable support, related fixed plates, and related electromagnetic coils in an embodiment of this application.

[0026] Figure 8 An exploded view of the movable support, related fixed plates, and related electromagnetic coils in an embodiment of this application is shown.

[0027] Figure 9 This illustration shows a projection diagram of the first fixed pole plate, the fourth fixed pole plate, and the first driving magnet in an embodiment of this application.

[0028] Figure 10 This paper shows a projection diagram of the third fixed electrode plate, the fifth fixed electrode plate, and the movable electrode plate in an embodiment of this application.

[0029] Figure 11 An exploded view of a movable support according to an embodiment of this application is shown;

[0030] Figure 12 An equivalent circuit diagram of the relevant capacitors and detection circuits in an embodiment of this application is shown;

[0031] Figure 13 This paper shows another equivalent circuit diagram of the relevant capacitors and detection circuits in the embodiments of this application;

[0032] Figure 14 This paper shows another equivalent circuit diagram of the relevant capacitor and detection circuit in an embodiment of this application.

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

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0037] Currently, in order to reduce the cost of optical lens movement distance detection solutions, some solutions use a capacitor structure to detect the movement distance of the optical lens. This method calculates the distance / area between the two plates of the capacitor by measuring the capacitance value, thereby determining the movement distance of the optical lens.

[0038] See Figure 1 , Figure 1 A schematic diagram of a motion distance detection scheme for an optical lens in the related art is shown. In this scheme, one plate of a capacitor is set on a moving structure (e.g., a moving bracket that mounts the optical lens), while the other plate is set on a fixed structure (e.g., a fixed bracket that mounts the moving bracket to make it move). At the same time, the detection circuit needs to be electrically connected to both plates simultaneously, and then the capacitance can be calculated according to the capacitance calculation formula.

[0039]

[0040] Where C is the capacitance, 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 of ​​the plates facing each other, and d is the distance between the plates.

[0041] When the optical lens causes the electrode plates to move away from or towards each other, the distance the optical lens moves is:

[0042]

[0043] Where D is the distance the optical lens moves, and d0 is the distance between the plates before they move.

[0044] When the optical lens causes one electrode to translate parallel to the length of the other electrode (assuming the electrode is rectangular), the distance the optical lens moves is:

[0045]

[0046] Where s0 is the area facing the electrode before it moves, and B is the width of the electrode.

[0047] As can be seen, the detection circuit needs to be electrically connected to both a stationary plate and a moving plate simultaneously, 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 miniaturized camera modules (such as mobile phone camera modules).

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

[0049] First, refer to Figure 2 as well as Figure 3 , Figure 2 This invention illustrates an assembly diagram of a camera motor according to an embodiment of the present application. Figure 3 An exploded view of a camera motor according to an embodiment of this 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 movable support 10 is used to move the optical lens (or the optical lens mounting the optical lens) relative to the fixed support 20, so as to achieve optical focusing and / or optical image stabilization of the optical lens. In some embodiments of this application, the movable support 10 can be along the optical axis direction of the optical lens (e.g., Figure 2 as well as Figure 3 The moving bracket 10 can be moved along the third axis (Z direction shown) to enable the optical lens to perform optical focusing. In some embodiments of this application, the moving bracket 10 can be moved along a direction perpendicular to the optical axis of the optical lens (e.g., along the Z direction) to enable the optical lens to perform optical focusing. Figure 2 as well as Figure 3 The first axis (X) and the second axis (Y) shown are moved to allow the optical lens to move in a direction perpendicular to the optical axis for optical image stabilization. In some embodiments of this application, the movable support 10 can move along the optical axis of the optical lens and can also move in a direction perpendicular to the optical axis of the optical lens to allow the optical lens to perform optical focusing and optical image stabilization.

[0051] In some embodiments of this application, the movable support 10 is approximately a hollow annular support, such as a rectangular or circular support, to facilitate the mounting of the optical lens in the middle of the annular movable support 10, thereby preventing the movable support 10 from covering part of the optical lens and blocking the light incident on the optical lens. Those skilled in the art will understand that the movable support 10 can also have other structural forms, as long as the movable support 10 does not affect the light propagation of the optical lens.

[0052] In some embodiments of this application, the movable support 10 may be a single support. For example, in an embodiment where the movable support 10 can move along the optical axis of the optical lens, the movable support 10 may refer to the focusing support in the camera motor; or, in an embodiment where the movable support 10 can move along a direction perpendicular to the optical axis of the optical lens, the movable support 10 may refer to the image stabilization support in the camera motor.

[0053] In some embodiments of this application, the movable support 10 can be a combined support composed of multiple supports. For example, in embodiments where the movable support 10 can move along the optical axis of the optical lens and also along a direction perpendicular to the optical axis of the optical lens, the movable support 10 can also refer to a combined support composed of a focusing support and an image stabilization support. The image stabilization support can move relative to the fixed support 20 along a direction perpendicular to the optical axis of the optical lens, and the focusing support can move relative to the image stabilization support along the optical axis of the optical lens. Therefore, the optical lens mounted on the focusing support can move relative to the fixed support 20 along a direction perpendicular to the optical axis 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 moved in the directions shown.

[0054] A driving magnet 11 is provided on the movable support 10. The driving magnet 11 is magnetic, so that the electromagnetic coil 21 on the fixed support 20 generates magnetic force to drive the driving magnet 11 to move the movable support 10. In some embodiments of this application, only one driving magnet 11 may be provided on the movable support 10, serving as a driving element for moving the movable support 10 in a single direction. In some embodiments of this application, the driving magnets 11 may be arranged in pairs on the movable support 10, for example, the driving magnets 11 may be located on opposite sides of the movable support 10, so that the magnetic force generated by the pair of first driving magnets 111 provides a stable supporting force and a driving force for the movable support 10. In some embodiments of this application, multiple driving magnets 11 may be provided on the movable support 10, so that the movable support 10 can move 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 movable support 10 has a conductive structure so that the first, second, and third plates are aligned with the conductive structure on the movable support 10, thereby forming a first capacitor, a second capacitor, and a third capacitor. The conductive structure on the movable support 10 includes a driving magnet 11 and / or a movable plate 114 fixed to the movable support 10. For example, when the driving magnet 11 is conductive (e.g., the material of the driving magnet 11 is neodymium iron boron, ferrite, cobalt, or AlNiCo, etc., which are both magnetic and conductive), the first, second, and third plates can be aligned with the driving magnet 11. Thus, a first capacitor, a second capacitor, and a third capacitor are formed; or, for example, when the driving magnet 11 is not conductive, a movable electrode plate 114 can be provided on the movable support 10, and the first electrode plate, the second electrode plate, and the third electrode plate can be opposite to the movable electrode plate 114, thereby forming a first capacitor, a second capacitor, and a third capacitor; or, for example, when the driving magnet 11 is conductive and the movable support 10 is also provided with a movable electrode plate 114, the first electrode plate and the second electrode plate can be opposite to the driving magnet 11, and the third electrode plate can be opposite to the movable electrode plate 114, thereby forming a first capacitor, a second capacitor, and a third capacitor.

[0056] It should be noted that when the first, second, and third plates are opposite to the same conductive structure (e.g., the driving magnet 11), the plates of the first, second, and third capacitors, which are equivalently fixed on the movable support 10, are electrically connected to each other. The equivalent schematic diagram of the first, second, and third capacitors and the detection circuit board 60 at this time is shown below. Figure 4 As shown; when the first, second, and third plates are opposite to different driving magnets 11 and / or movable plates 114, they need to be electrically connected to the different driving magnets 11 and / or movable plates 114 through wires or metal wires. This is equivalent to connecting the plates of the first, second, and third capacitors, which are equivalently fixed on the movable bracket 10, to each other through wires or metal wires. At this time, the equivalent schematic diagram of the first, second, and third capacitors and the detection circuit board 60 is shown in the figure. Figure 5 As shown.

[0057] The fixed bracket 20 provides a fixed mounting base for the fastener and allows the movable bracket 10 to move relative to the fixed bracket 20. For example, the fixed bracket 20 can provide a fixed mounting 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 this application, the fixed bracket 20 is approximately a hollow annular bracket, such as a rectangular bracket or a circular bracket, 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 understand 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] When the electromagnetic coil 21 is energized, it generates a magnetic force that repels or attracts the driving magnet 11, thereby driving the driving magnet 11 to move the movable support 10. In some embodiments of this application, the first electromagnetic coil 211 can drive the driving magnet 11 to move the movable support 10 along the optical axis to facilitate focusing adjustment of the optical lens. In some embodiments of this application, the electromagnetic coil 21 can drive the first driving magnet 111 to move the movable support 10 in a direction perpendicular to the optical axis to facilitate optical image stabilization of the optical lens.

[0060] Understandably, one or more electromagnetic coils 21 can be provided, and the drive magnet 11 can be driven by one or more electromagnetic coils 21 to move the movable support 10. This application does not make a specific limit on the number of electromagnetic coils 21.

[0061] In some embodiments of this application, the electromagnetic coil 21 may be located within the detection circuit board 60. This facilitates power supply to the electromagnetic coil 21 and simplifies the fabrication and assembly (e.g., installation, wiring) process of the camera motor. It is understood that the electromagnetic coil 21 may also be fixed to the side of the detection circuit board 60 facing the movable bracket 10, or it may 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, the second fixed electrode plate 40 and the conductive structure on the movable bracket 10 form a second capacitor, and the third fixed electrode plate 50 and the conductive structure on the movable bracket 10 form a third capacitor. This allows the detection circuit to 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 this application, such as an embodiment where only one driving magnet 11 is provided on the movable bracket 10, the first fixed plate 30, the second fixed plate 40, and the third fixed plate 50 can be directly opposite the same driving magnet 11 to form a series-connected first capacitor, second capacitor, and third capacitor. In other embodiments of this application, such as an embodiment where a driving magnet 11 and a movable plate 114 are provided on the movable bracket 10, the first fixed plate 30, the second fixed plate 40, and the third fixed plate 50 can be directly opposite different driving magnets 11 and movable plates 114. After electrically connecting the driving magnet 11 and the movable plate 114 on the movable bracket 10, a series-connected first capacitor, second capacitor, and third capacitor can be formed.

[0064] In some embodiments of this application, the first fixed electrode plate 30, the second fixed electrode plate 40, and the third fixed electrode plate 50 can be located within the detection circuit board 60. This facilitates 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 also simplifies the fabrication and assembly process of the camera motor. In some embodiments of this application, such as... 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] The detection circuit board 60 is equipped with a detection circuit, which is used to 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.

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

[0067] For example, in Figure 4 In the detection circuit, a first preset amount of positive charge is injected into the first fixed plate 30, and a first preset amount of negative charge is injected into the second fixed plate 40. Since the first capacitor and the second capacitor are connected in series, after measuring the voltage difference between the first fixed plate 30 and the second fixed plate 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 amount, and Ux is the voltage difference between the first fixed plate 30 and the second fixed plate 40.

[0070] Similarly, in Figure 4 In the process, after measuring the first series capacitance value, the detection circuit can inject a second preset amount of positive charge into the first fixed plate 30 and a second preset amount of negative charge into the third fixed plate 50. Since the first capacitor and the third capacitor are connected in series, after measuring the voltage difference between the first fixed plate 30 and the third fixed plate 50, the second series capacitance value of the first capacitor and the third capacitor can be measured at this time:

[0071] Cy = Qy / Uy

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

[0073] Similarly, in Figure 4 In the process, after measuring the value of the second series capacitance, the detection circuit can inject a third preset amount of positive charge into the second fixed plate 40 and a third preset amount of negative charge into the third fixed plate 50. Since the second and third capacitors are connected in series, after measuring the voltage difference between the second fixed plate 40 and the third fixed plate 50, the value of the third series capacitance of the second and third capacitors can be measured at this time:

[0074] Cz=Qz / Uz

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

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

[0077] In the embodiments of this 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 as the movable support 10 moves, after determining the capacitance values ​​of the first capacitor, the second capacitor, and the third capacitor, the moving distance of the movable support 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 using 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] Where C1 is the capacitance of the first capacitor, C2 is the capacitance of the second capacitor, and C3 is the capacitance of the third capacitor.

[0083] As can be seen, Cx, Cy, and Cz are known quantities obtained from measurements. The three formulas above only contain three unknowns: C1, C2, and C3. Therefore, the capacitance values ​​of the first capacitor, the second capacitor, and the third capacitor can be calculated by simultaneously applying these three formulas.

[0084]

[0085] Assuming the area of ​​the plates facing each other in the first capacitor remains constant, while the distance between the plates changes as the movable support 10 moves along the first axis X, the distance between the plates of the first capacitor can be calculated using the following formula:

[0086]

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

[0088] As can be seen, since the distance between the plates of the first capacitor changes as the moving bracket 10 moves along the first axis X direction, the distance between the plates of the first capacitor obtained by solving the above formula can be used to determine the moving distance of the moving bracket 10 along the first axis X direction.

[0089] Similarly, assuming that the area of ​​the plates facing each other of the second and third capacitors remains unchanged, and the distance between the plates of the second capacitor changes as the moving bracket 10 moves along the second axis Y, and the distance between the plates of the third capacitor changes as the moving bracket 10 moves along the third axis Z, then the moving distance of the moving bracket 10 along the first axis X and the second axis Y can be determined in the same way.

[0090] Understandably, the above embodiment is an example of determining the moving distance of the movable support 10 based on the change in the distance between the capacitor plates, with the area of ​​the capacitor plates facing each other remaining constant. In practice, the distance between the capacitor plates can also be determined based on the change in the area of ​​the capacitor plates facing each other, by arranging the plates so that the distance between the capacitor plates remains constant.

[0091] Therefore, in this embodiment of the application, by setting a driving magnet 11 on the movable bracket 10, the electromagnetic coil 21 on the fixed bracket 20 can drive the driving magnet 11 and move the movable bracket 10. When the optical lens (or optical lens) is installed on the movable bracket 10, optical focusing or optical image stabilization functions can be realized. Meanwhile, since the first fixed plate 30 and the conductive structure on the movable bracket 10 form a first capacitor, the second fixed plate 40 and the conductive structure on the movable bracket 10 form a second capacitor, and the third fixed plate 50 and the conductive structure on the movable bracket 10 form a third capacitor, 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, based on the first series capacitance value, the second series capacitance value, and the third capacitance value, three formulas can be combined to calculate the capacitance value of the first capacitor, the capacitance value of the second capacitor, and the capacitance value of the third capacitor. Then, based on the capacitance values ​​of the first capacitor, the second capacitor, and the third capacitor, the moving distance of the optical lens (or optical lens) in the focusing direction or the image stabilization direction can be determined, thus realizing the closed-loop control process of optical lens movement control and optical lens movement detection.

[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 this 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, the detection circuit of this application is connected to three fixed electrode plates. This avoids the phenomenon that the detection circuit needs to be connected to a fixed electrode plate and a movable electrode plate respectively, which ultimately leads to the difficulty in realizing the optical lens movement distance detection scheme and the high cost.

[0093] In some embodiments of this application, see Figure 2 as well as Figure 3The conductive structure on the movable support 10 includes a first driving magnet 111, a second driving magnet 112, and a movable electrode plate 114. The first driving magnet 111, the second driving magnet 112, and the movable electrode plate 114 are electrically connected to each other. A first fixed electrode plate 30 and the first driving magnet 111 form a first capacitor; a second fixed electrode plate 40 and the second driving magnet 112 form a second capacitor; and a third fixed electrode plate 50 and the movable electrode plate 114 form a third capacitor. In other words, the first fixed electrode plate 30, the second fixed electrode plate 40, and the third fixed electrode plate 50 can be opposite different conductive structures on the movable support 10 to form the first capacitor, the second capacitor, and the third capacitor, respectively.

[0094] Understandably, in some possible embodiments, the conductive structure on the movable support 10 may also include a first driving magnet 111 and a movable electrode plate 114. A first fixed electrode plate 30, a second fixed electrode plate 40, and the first driving magnet 111 form a first capacitor and a second capacitor, respectively, while a third fixed electrode plate 50 and the movable electrode plate 114 form a third capacitor. After electrically connecting the first driving magnet 111 and the movable electrode plate 114, the first series capacitance value, the second series capacitance value, and the third series capacitance value can be measured by a measuring circuit. Alternatively, the first fixed electrode plate 30, the second fixed electrode plate 40, and the movable electrode plate 114 form a first capacitor and a second capacitor, respectively, while the third fixed electrode plate 50 and the first driving magnet 111 form a third capacitor. After electrically connecting the first driving magnet 111 and the movable electrode plate 114, 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 this 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 reading Figure 3The first driving magnet 111 is arranged on the side of the movable support 10 perpendicular to the first axis X. 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 move the movable support 10 along the first axis X. At this time, the first fixed plate 30 and the first driving magnet 111 move closer or further away from each other, so that the capacitance value of the first capacitor changes as the movable support 10 moves along the first axis X. The second driving magnet 112 is arranged on the side of the movable support 10 perpendicular to the second axis Y. The second electromagnetic coil 212 is opposite to the second driving magnet 112. At this time, the first fixed plate 30 and the first driving magnet 111 move closer or further away from each other, so that the capacitance value of the second capacitor changes as the movable support 10 moves along the second axis Y.

[0097] Understandably, when Figure 3 As merely an exemplary embodiment of the first fixed electrode plate 30, the second fixed electrode plate 40, the third fixed electrode plate 50, the first driving magnet 111, the second driving magnet 112, the first electromagnetic coil 211, and the second electromagnetic coil 212 in this application, those skilled in the art can make equivalent modifications to the positions of the above-mentioned components under the guidance of this application. For example, the first fixed electrode plate 30 and the third fixed electrode plate 50 can be placed on the same side, and both the first fixed electrode plate 30 and the third fixed electrode plate 50 can be directly opposite the first driving magnet 111; or, for another example, the movable electrode plate 114 can be placed at the bottom of the movable bracket 10, so that the third fixed electrode plate 50 is placed at the bottom of the fixed bracket 20 and opposite to the movable electrode plate 114, thereby forming a third capacitor.

[0098] In some embodiments of this application, the capacitance value of the third capacitor remains unchanged during the movement of the movable support 10.

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

[0100]

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

[0102]

[0103] Therefore, the distance between the plates of the first capacitor can be calculated using the following formula:

[0104]

[0105] In the above formula, S1, d3, and S3 are constant and known quantities that remain unchanged during the movement of the movable support 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 movable support 10 can be determined. Furthermore, since the dielectric constant parameter is eliminated by the capacitance ratio of the first and third capacitors in the above formula, changes in the capacitor's environment (such as temperature changes) that alter the dielectric constant will not cause errors in the detection of the moving position of the movable support 10, thus improving the robustness of the detection scheme.

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

[0107] For example, see Figure 3 The first fixed plate 30 and the third fixed plate 50 are located on opposite sides of the movable bracket 10. The plane of the first fixed plate 30 is perpendicular to the first axis X, the plane of the second fixed plate 40 is perpendicular to the second axis Y, and the plane of the third fixed plate 50 is perpendicular to the first axis X. During the movement of the movable bracket 10, the areas of the plates facing each other of the first capacitor, the second capacitor, and the third capacitor 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. Therefore, during the movement of the movable bracket 10, the second series capacitance value of the first capacitor and the third capacitor can remain unchanged.

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

[0109]

[0110] Where d0 is the sum of the plate spacings of the first capacitor and the third capacitor.

[0111] Therefore, the capacitance ratios of the first capacitance value to the second series capacitance value, and the second capacitance value to the second series capacitance value, can be calculated using the following formula:

[0112]

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

[0114]

[0115] Where d2 is the plate spacing of the second capacitor 20, and S2 is the area of ​​the plates of the second capacitor 20 facing each other.

[0116] In the above formula, S1, S2, and d0 are constant and known quantities that remain unchanged during the movement of the movable support 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 and second capacitors can be calculated, and the movement position of the movable support 10 in the plane coordinate system constructed by the first axis X-line and the second axis Y-line can be determined. Furthermore, since the dielectric constant parameter is eliminated by using the capacitance ratio in the above formula, changes in the capacitor's environment (such as temperature changes) that alter the dielectric constant will not cause errors in the detection of the movable support 10's movement position, ultimately improving the robustness of the detection scheme.

[0117] Understandably, in some possible embodiments, the positions of the first fixed electrode plate 30, the second fixed electrode plate 40, and the third fixed electrode plate 50 can be adjusted during the movement of the movable support 10, for example... Figure 6 As shown, the first fixed plate 30, the second fixed plate 40, and the third fixed plate 50 are all opposite to the same driving magnet 11. When the driving magnet 11 moves along the first axis X direction with the moving bracket 10, 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 areas of the plates facing each other of the first capacitor and the third capacitor remains unchanged. Ultimately, during the movement of the moving bracket 10, the sum of the capacitance values ​​of the first capacitor and the third capacitor remains unchanged.

[0118] In some embodiments of this application, see Figure 7 as well as Figure 8 , Figure 7 This illustration shows an assembly diagram of the movable support 10, the associated fixed plate, and the associated electromagnetic coil 21 in an embodiment of this application. Figure 8 An exploded view of a movable support 10, related fixed plates, and related electromagnetic coils 21 in an embodiment of this application is shown. The conductive structure on the movable support 10 also includes a third driving magnet 113, and the fixed support 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 movable support 10 to move along the third axis Z direction.

[0119] In other words, when the movable support 10 is equipped with a first driving magnet 111, a second driving magnet 112, and a third driving magnet 113, and the fixed support 20 is equipped 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 move the movable support 10 along the first axis X (first axis X direction), the second electromagnetic coil 212 can drive the second driving magnet 112 to move the movable support 10 along the second axis Y (second axis Y direction), and the third electromagnetic coil 213 can drive the third driving magnet 113 to move the movable support 10 along the third axis Z (third axis Z direction). Thus, the movable support 10 can perform three-dimensional movement. The movement of the movable support 10 in the first axis X and the second axis Y directions corresponds to the image stabilization movement of the optical lens, and the movement of the movable support 10 in the third axis Z direction corresponds to the focusing movement of the optical lens. Ultimately, the focusing and image stabilization functions of the optical lens are achieved simultaneously.

[0120] Understandably, when the optical lens only has optical image stabilization, it is only necessary to set the first driving magnet 111, the second driving magnet 112 and the corresponding first electromagnetic coil 211 and the second electromagnetic coil 212; when the optical lens only has optical focusing, 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 driving magnet 11 according to the function of the camera motor.

[0121] It should be noted that, in Figure 3 The first capacitor, second capacitor, and 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 movable support 10 along the first axis X and the second axis Y. In order to further detect the moving distance of the movable support 10 along the first axis X, please refer to the following content.

[0122] In some embodiments of this application, the camera motor further 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 movable bracket 10 form a fourth capacitor, and the fifth fixed electrode plate 80 and the conductive structure on the movable bracket 10 form a fifth capacitor; the detection circuit is electrically connected to the fourth fixed electrode plate 70 and the fifth fixed electrode plate 80, and the detection circuit is also used to detect the 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 10 moves along the third axis Z direction.

[0123] For example, continue reading Figure 7as well as Figure 8 The fourth fixed plate 70 and the first driving magnet 111 form a fourth capacitor, and the fifth fixed plate 80 and the movable plate 114 form a fifth capacitor. That is, the fourth fixed plate 70 and the fifth fixed plate 80 are located on opposite sides of the movable support 10. When the movable support 10 moves along the first axis X, the second axis Y, and the third axis Z, the sum of the plate spacing of the fourth capacitor and the fifth capacitor remains unchanged. When the movable support 10 moves along the first axis X and the second axis Y, the facing areas of the fourth and fifth capacitors remain unchanged. The facing areas of the fourth and fifth capacitors only change as the movable support 10 moves along the third axis Z. Therefore, the fourth series capacitance value of the fourth and fifth capacitors can be calculated using the following formula:

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

[0125]

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

[0127] Assuming that during the movement of the movable support 10, S4 = S5 = S0, according to the above formula, we know that:

[0128]

[0129] Since the sum of the plate spacing of the fourth capacitor and the plate spacing of the fifth capacitor remains constant during the movement of the movable support 10, and the facing areas of the plates of the fourth capacitor and the fifth capacitor only change as the movable support 10 moves along the third axis Z direction, d4+d5 in the above formula are known fixed values. S0 corresponds to the change in the fourth series capacitance value of the fourth and fifth capacitors as the movable support 10 moves along the third axis Z direction. Therefore, S0 can be calculated using the following formula:

[0130]

[0131] Where B is the width corresponding to the area of ​​the plates of the fourth and fifth capacitors facing each other, and L is the length corresponding to the area of ​​the plates of the fourth and fifth capacitors facing each other.

[0132] Assuming in Figure 8 In the above formula, the movable support 10 moves along the third axis Z direction, only changing B. Therefore, the moving distance of the movable support 10 along the third axis Z direction can be calculated using 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 moving bracket 10, the moving distance of the moving bracket 10 along the third axis Z direction can be determined.

[0135] In some embodiments of this application, the fourth fixed plate 70 may also form a fourth capacitor opposite to the third driving magnet 113, and the fifth fixed plate 80 may also form a fifth capacitor opposite to the third driving magnet 113. During the movement of the movable support 10, the distance between the plates of the fourth capacitor and the fifth capacitor remains unchanged, and the area of ​​the plates facing each other of the fourth capacitor and the fifth capacitor changes only as the movable support 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 movable support 10 along the third axis Z direction can also be determined.

[0136] In some embodiments of this application, see Figure 9 , Figure 9 A projection diagram of a first fixed electrode plate 30, a fourth fixed electrode plate 70, and a first driving magnet 111 is shown. The first fixed electrode plate 30, the fourth fixed electrode plate 70, and the first driving magnet 111 are projected onto the plane containing the second axis Y and the third axis Z. The first fixed electrode plate 30 and the fourth fixed electrode plate 70 are arranged along the third axis Z and face the first driving magnet 111. The width of the first fixed electrode plate 30 along the third axis Z is smaller than the width of the first driving magnet 111 along the third axis Z. Therefore, the first fixed electrode plate 30 can form a first capacitor facing the middle of the first driving magnet 111, while the fourth fixed electrode plate 70 can form a fourth capacitor facing the edge of the first driving magnet 111.

[0137] See Figure 10 , Figure 10A projection diagram of the third fixed electrode 50, the fifth fixed electrode 80, and the movable electrode 114 is shown. The third fixed electrode 50, the fifth fixed electrode 80, and the movable electrode 114 are projected onto the plane containing the second axis YY and the third axis ZZ. The third fixed electrode 50 and the fifth fixed electrode 80 are arranged along the third axis Z and face the movable electrode 114. The width of the third fixed electrode 50 along the third axis Z is smaller than the width of the movable electrode 114 along the third axis Z. Therefore, the third fixed electrode 50 can form a third capacitor facing the center of the movable electrode 114, while the fifth fixed electrode 80 can form a fifth capacitor facing the edge of the first driving magnet 111.

[0138] When the movable support 10 moves along the first axis X direction, it can be seen that the area of ​​the plates facing each other of the first capacitor and the third capacitor remains unchanged while the distance between the plates changes. Furthermore, the sum of the distances between the plates of the first capacitor and the third capacitor remains unchanged, as does the area of ​​the plates facing each other of the fourth capacitor and the fifth capacitor. Therefore, the distance the movable support 10 moves along the first axis X direction can be measured using the first capacitor and the third capacitor.

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

[0140] When the movable support 10 moves along the third axis Z direction, the facing area and spacing of the plates of the first and third capacitors remain unchanged, while the spacing between the plates of the fourth and fifth capacitors remains unchanged, but the facing area of ​​the plates of the fourth and fifth capacitors changes. Therefore, the moving distance of the movable support 10 along the third axis Z direction can be measured using the fourth and fifth capacitors.

[0141] Combination Figure 8 , Figure 9 as well as Figure 10 The above 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 detect the moving distance of the moving bracket 10 along the first axis X direction and the third axis Z direction, while also making the camera motor assembly more compact, which is beneficial to reducing the size of the camera motor.

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

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

[0144] Furthermore, since the first driving magnet 111, the second driving magnet 112, and the movable pole plate 114 are mounted on the third sub-support 103, combined with Figure 8 , Figure 9 , Figure 10 The arrangement of the fixed plates not only enables the detection of the moving distance of the movable support along the first axis X direction, the second axis Y direction, and the third axis Z direction by forming the first capacitor, the third capacitor, the second capacitor, the fourth capacitor, and the fifth capacitor, but also makes it easier to electrically connect the first driving magnet 111, the second driving magnet 112, and the movable plate 114 on the same third sub-support 103. This avoids the problem of installing the first driving magnet 111 on the third sub-support 103 and the second driving magnet 112 on the second sub-support 102, which would otherwise make it difficult to electrically connect the first driving magnet 111, the second driving magnet 112, and the movable plate 114.

[0145] Understandably, the above embodiment divides the movable support 10 into three sub-supports, which are responsible for movement in the first axis X, the second axis Y, and the third axis Z, respectively. In some possible embodiments, the movable support 10 may also be divided into two sub-supports, one of which is responsible for movement in the first axis X and the second axis Y, and the other is responsible for movement in the third axis Z.

[0146] In some embodiments of this application, see Figure 11 , Figure 11 An exploded view of a movable support 10 according to an embodiment of this application is shown. A first sub-support 101 is provided with a first ball groove 1011 arranged along the third axis Z direction. The first ball groove 1011 is opposite to the fixed support 20, and a first ball 1012 is installed in the first ball groove 1011. The first ball 1012 can provide support for the movement of the first sub-support 101 along the third axis Z direction. A second sub-support 102 is provided with a second ball groove 1021 arranged along the second axis Y direction. The second ball groove 1021 is... The first sub-support 101 is opposite to the second sub-support 102, and the second ball 1022 is installed in the second ball groove 1021. The second ball 1022 can provide support for the movement of the second sub-support 102 along the second axis Y direction. The third sub-support 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-support 102, and the third ball 1032 is installed in the third ball groove 1031. The third ball 1032 can provide support for the movement of the third sub-support 103 along the first axis X direction.

[0147] Understandably, in some possible embodiments, other sliding fits, such as slide rails or slide grooves, may also be used between the first sub-support 101, the second sub-support 102, the third sub-support 103, and the fixed support 20 to achieve the purpose of moving the optical lens along the three-dimensional direction by the movable support 10.

[0148] To better understand the technical solution of this application, the detection circuit will be further described below. It should be noted that the following description should not be considered as a limitation on the detection circuit in the claims of this application.

[0149] In some embodiments of this application, see [reference]. Figure 12 , Figure 12The diagram shows another equivalent circuit diagram of the relevant capacitors and detection circuit in the embodiments of this application. The detection circuit includes a switching circuit and a measurement circuit. The first fixed plate 30, the second fixed plate 40, the third fixed plate 50, the fourth fixed plate 70, and the fifth fixed plate 80 are connected to the input terminal of the switching circuit, and the input terminal of the measurement circuit is connected to the output terminal of the switching circuit. The switching circuit is used to conduct the path between any two of the first fixed plate 30, the second fixed plate 40, the third fixed plate 50, the fourth fixed plate 70, and the fifth fixed plate 80 and the measurement circuit. The measurement circuit is used to detect the series capacitance value of the two capacitors whose path with the measurement circuit is conducted.

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

[0151] As an example, see Figure 13 , Figure 13 An equivalent circuit diagram of the relevant capacitor and detection circuit in an embodiment of this application is shown, wherein the switching 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 plate 30 and the second fixed plate 40 and the measuring circuit is connected. Therefore, the measuring circuit can measure the first series capacitance value 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 plate 30 and the third fixed plate 50 and the measuring circuit is connected. Therefore, the measuring 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 plate 40 and the third fixed plate 50 and the measuring circuit is connected. Therefore, the measuring 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 plate 70 and the fifth fixed plate 80 and the measuring circuit is connected. Therefore, the measuring circuit can measure the fourth series capacitance value of the fourth capacitor and the fifth capacitor.

[0156] It is understood that the above-described switching circuit is merely an exemplary embodiment. 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 switching functions, including but not limited to MOSFETs, IGBTs, and triodes. It should also be noted that the above-described switching circuit and measurement circuit can be integrated into a dedicated chip (e.g., a camera chip) or integrated on a circuit board; this application does not impose specific limitations.

[0157] In some embodiments of this application, see further reference. Figure 14 , Figure 14 This illustration shows another equivalent circuit diagram of the relevant capacitor and detection circuit in an embodiment of this application. 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 that 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 two corresponding fixed plates, thereby enabling the analog-to-digital converter to 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 plate 30, and the second charge injection circuit 602 injects a first preset amount of second charge into the second fixed plate 40. The first series capacitance values ​​of the first capacitor and the second capacitor can be calculated according to the following formula:

[0159]

[0160] Where 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 quantity.

[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 all calculated in the same way, and will not be repeated here.

[0162] Understandably, the above description of the camera motor is intended to clearly illustrate the implementation and verification process of this application. Under the guidance of this application, those skilled in the art can also make equivalent modifications. For example, by setting the positions of the first fixed electrode plate 30, the second fixed electrode plate 40, and the third fixed electrode plate 50, the capacitance value of the first capacitor changes as the moving bracket 10 moves along the first axis X direction, the capacitance value of the second capacitor changes as the moving bracket 10 moves along the second axis Y direction, and the capacitance value of the third capacitor changes as the moving bracket 10 moves along the third axis Z direction. Then, after calculating the capacitance values ​​of the first, second, and third capacitors based on the first, second, and third series capacitor values, the three-dimensional spatial position of the moving bracket 10 can be determined based on the capacitance values ​​of the first, second, and third capacitors.

[0163] Furthermore, to better implement the camera motor in the embodiments of this application, based on the camera motor, this application also provides a camera module, which includes the camera motor as described in any of the above embodiments. Since the camera module in the embodiments of this application has all the beneficial effects of the above-described camera motor due to the inclusion of the camera motor, it will not be elaborated further here.

[0164] Furthermore, to better implement the camera module in the embodiments of this application, based on the camera module, this application also provides an electronic device, which includes the camera module as described in any of the above embodiments. Since the electronic device in the embodiments of this application is equipped with the camera motor of the above embodiments, it possesses all the beneficial effects of the aforementioned camera motor, which will not be elaborated further here.

[0165] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0166] The foregoing has provided a detailed description of a camera motor, camera module, and electronic device provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A camera motor, characterized in that, include: A movable support, on which a driving magnet is provided; A fixed bracket, wherein an electromagnetic coil is provided on the fixed bracket for driving the driving magnet and moving the movable bracket. The first fixed electrode plate, the second fixed electrode plate, and the third fixed electrode plate are fixed relative to the fixed 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 support includes the driving magnet and / or a movable electrode plate fixed on the movable support, and the capacitance value of at least one of the first capacitor, the second capacitor and the third capacitor changes as the movable support moves. 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 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. 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 as described in claim 1, characterized in that, The conductive structure on the movable support includes a first driving magnet, a second driving magnet, and a movable electrode plate. The first driving magnet, the second driving magnet, and the movable electrode plate are electrically connected to each other. The first fixed electrode plate and the first driving magnet form the first capacitor, the second fixed electrode plate and the second driving magnet form the second capacitor, and the third fixed electrode plate and the movable electrode plate form the third capacitor.

3. The camera motor as described in claim 2, characterized in that, The fixed bracket is equipped with a first electromagnetic coil and a second electromagnetic coil. The first electromagnetic coil is used to drive the first driving magnet and move the movable bracket along the first axis direction; the second electromagnetic coil is used to drive the second driving magnet and move the movable bracket along the second axis direction. The capacitance value of the first capacitor changes as the movable support moves along the first axis, and the capacitance value of the second capacitor changes as the movable support moves along the second axis.

4. The camera motor as described in claim 3, characterized in that, During the movement of the movable support, the second series capacitance value of the first capacitor and the third capacitor remains unchanged; or During the movement of the movable support, the sum of the capacitance values ​​of the first capacitor and the third capacitor remains unchanged; or During the movement of the movable support, the capacitance value of the third capacitor remains unchanged.

5. The camera motor as described in claim 4, characterized in that, During the movement of the movable support, the area of ​​the plates facing each other of the first capacitor and the area of ​​the plates facing each other of the third capacitor 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 movable support, the spacing between the plates of the first capacitor and the spacing between the plates of the third capacitor remain unchanged, and the sum of the areas of the plates facing each other of the first capacitor and the third capacitor remains unchanged.

6. The camera motor as described in claim 5, characterized in that, The first driving magnet and the movable pole plate are respectively located on opposite sides of the movable support; The plane containing the first fixed electrode plate is perpendicular to the first axis, the plane containing the second fixed electrode plate is perpendicular to the second axis, and the plane containing the third fixed electrode plate is perpendicular to the first axis. During the movement of the movable support, the areas of the plates facing each other of the first capacitor, the second capacitor, and the third capacitor 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.

7. The camera motor as described in claim 3, characterized in that, The conductive structure on the movable support also includes a third driving magnet, and the fixed support is also provided with a third electromagnetic coil. The third electromagnetic coil is used to drive the third driving magnet and move the movable support along the third axis.

8. The camera motor as described in claim 7, characterized in that, The camera motor also includes a fourth fixed electrode plate and a fifth fixed electrode 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 form a fourth capacitor, and the fifth fixed electrode plate and the conductive structure on the movable bracket form a fifth capacitor. The detection circuit is electrically connected to the fourth fixed plate and the fifth fixed plate. The detection circuit is also used to detect the fourth series capacitance value of the fourth capacitor and the fifth capacitor. The capacitance values ​​of the fourth capacitor and the fifth capacitor change as the movable support moves along the third axis.

9. The camera motor as described in claim 8, characterized in that, The fourth fixed plate and the first driving magnet are opposite to form the fourth capacitor, and the fifth fixed plate and the movable plate are opposite to form the fifth capacitor; During the movement of the movable support, the sum of the plate spacing of the fourth capacitor and the plate spacing of the fifth capacitor remains unchanged, and the facing areas of the plates of the fourth capacitor and the fifth capacitor change only as the movable support moves along the third axis.

10. The camera motor as described in claim 9, characterized in that, The first fixed electrode plate and the fourth fixed electrode plate are arranged along the third axis and face the first driving magnet, and the width of the first fixed electrode plate along the third axis is smaller than the width of the first driving magnet along the third axis. The third fixed electrode plate and the fifth fixed electrode plate are arranged along the third axis and face the movable electrode plate, and the width of the third fixed electrode plate along the third axis is smaller than the width of the movable electrode plate along the third axis.

11. The camera motor as described in claim 8, characterized in that, The fourth fixed plate and the third driving magnet are opposite to form the fourth capacitor, and the fifth fixed plate and the third driving magnet are opposite to form the fifth capacitor; During the movement of the movable support, the distance between the plates of the fourth capacitor and the fifth capacitor remains unchanged, and the area of ​​the plates facing each other of the fourth capacitor and the fifth capacitor changes only as the movable support moves along the third axis.

12. The camera motor as described in claim 7, characterized in that, The movable support includes a first sub-support, a second sub-support, and a third sub-support; 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; the third sub-bracket is mounted on the second bracket and can move along the first axis direction. The first driving magnet and the second driving magnet are mounted on the third sub-support, and the third driving magnet is mounted on the first sub-support.

13. The camera motor as described in claim 12, characterized in that, The first sub-bracket is provided with a first ball groove arranged along the third axis direction. The first ball groove is opposite to the fixed bracket, and a first ball is installed in the first ball groove. The second sub-support is provided with a second ball groove arranged along the second axis, the second ball groove is opposite to the first sub-support, and a second ball is installed in the second ball groove; The third sub-support is provided with a third ball groove arranged along the first axis direction. The third ball groove is opposite to the second sub-support, and a third ball is installed in the third ball groove.

14. A camera module, characterized in that, Includes the camera motor as described in any one of claims 1 to 13.

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

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