A position detection structure of a motor and an electronic device

Abstract

The utility model relates to motor structure field discloses a motor's position detection structure and electronic equipment. The utility model discloses a motor's position detection structure includes: first drive coil and drive magnet interact to drive first carrier moves in focusing direction, second drive coil and drive magnet interact to drive second carrier moves in shaking direction, under the condition that first carrier moves, the relative position of first drive coil and metal piece changes, under the condition that second carrier moves, the relative position of second drive coil and metal piece changes, and the shape of the metal piece on the second carrier is bent to form the current -carrying coil, and the mutual inductance effect between metal piece and each drive coil in the original motor is used to determine the moving distance of each carrier, thereby determining the moving distance of the lens. The improved structure does not need to increase the motor size, and the bending process of the metal piece is simple and easy to operate, and the manufacturing cost of the motor is effectively controlled.

Description

Technical Field

[0001] This utility model relates to the field of motor structure, and in particular to a motor position detection structure and electronic device. Background Technology

[0002] In conventional anti-shake motors, in order to determine the movement of the motor carrier, position detection components are usually added to the motor. For example, Hall sensors are set at different positions in the motor, and the IC in the motor determines the movement of the motor in different directions based on the detection signals of the Hall sensors at different positions.

[0003] However, adding Hall sensors to detect position changes has the following problems: adding extra detection components to the motor increases the production cost, size, and manufacturing process of the motor structure. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a motor position detection structure and electronic device. An energized coil is formed by bending the shape of a metal part on a second carrier. The mutual inductance between the metal part and the original drive coils in the motor is used to determine the movement distance of each carrier, thereby determining the movement distance of the lens. This position detection structure only requires a specific bending of the metal part, without increasing the motor size. Furthermore, the bending process of the metal part is simple and easy to operate, effectively controlling the manufacturing cost of the motor.

[0005] To solve the above-mentioned technical problems, embodiments of this utility model provide a motor position detection structure, including: a first carrier, a second carrier, a circuit board, a driving magnet, a first driving coil, a second driving coil, and a metal part fixedly disposed on the second carrier, at least a portion of the metal part being bent to form an energized coil; the first driving coil is disposed on the first carrier, and the first driving coil interacts with the driving magnet to drive the first carrier to move relative to the circuit board in a focusing direction; the second driving coil is disposed on the circuit board, and the second driving coil interacts with the driving magnet to drive the second carrier to move relative to the circuit board in a shaking direction; the focusing direction is perpendicular to the shaking direction; when the first carrier moves, the relative position of the first driving coil and the metal part changes, and the moving distance of the first carrier is determined based on the mutual inductance between the first driving coil and the metal part; when the second carrier moves, the relative position of the second driving coil and the metal part changes, and the moving distance of the second carrier is determined based on the mutual inductance between the second driving coil and the metal part.

[0006] An embodiment of this utility model also provides an electronic device, including the above-described motor position detection structure.

[0007] Compared to existing technologies, this embodiment of the invention involves a first carrier moving relative to a circuit board in the focusing direction, and a second carrier moving relative to the circuit board in the shaking direction. Each direction of movement is equipped with a corresponding drive coil and drive magnet to provide driving force in different directions. A metal component is also fixedly mounted on the second carrier. An energized coil is formed by bending the metal component, and current flows through the metal component. When the first carrier moves, the relative position of the current-carrying first drive coil and the metal component changes, generating mutual inductance between them. The movement distance of the first carrier can be determined by the influence of this mutual inductance on the electrical signals of the first drive coil and the metal component. Similarly, when the second carrier moves, the relative position of the second drive coil and the metal component changes, generating mutual inductance between them. The movement distance of the second carrier can be determined by the influence of this mutual inductance on the electrical signals of the second drive coil and the metal component. This achieves the detection of the carrier's displacement in the focusing and shaking directions, thus determining the movement of the lens on the carrier. The aforementioned position detection structure only requires specific bending of the metal parts, without increasing the size of the motor. Furthermore, the bending process of the metal parts is simple and easy to operate, effectively controlling the manufacturing cost of the motor.

[0008] Alternatively, the metal part may be a support for the driving magnet or a spring.

[0009] In addition, if the metal part is a support for the driving magnet, the metal part is embedded in the side wall of the second carrier.

[0010] In addition, the metal part is bent sequentially through the four side walls of the second carrier to form a spiral structure, and the spiral structure serves as the energized coil.

[0011] In addition, if the metal part is a spring, the metal part covers the bottom surface of the second carrier.

[0012] In addition, the position detection structure of the motor also includes: a suspension wire and a base; the end of the metal part is connected to the suspension wire; a base sheet metal is embedded in the base; the metal part is connected to the base sheet metal through the suspension wire, and the base sheet metal is connected to an IC chip through the circuit board, and the IC chip is integrated on the circuit board.

[0013] In addition, the motor position detection structure also includes: an IC chip; the jitter direction includes the X-axis direction and the Y-axis direction; the first drive coil includes: a first power terminal; the second drive coil includes: an X-axis drive coil and a Y-axis drive coil, both of which have a second power terminal; the metal component includes: a third power terminal; the first power terminal, the second power terminal, and the third power terminal are all connected to the IC chip, and the IC chip applies current of different frequencies to the first drive coil, the X-axis drive coil, and the Y-axis drive coil through the first power terminal, the second power terminal, and the third power terminal, and the frequency at which the IC chip applies current to the metal component is different from the frequency at which the first drive coil, the X-axis drive coil, and the Y-axis drive coil apply current.

[0014] Furthermore, the movement distance of the first carrier is determined based on the mutual inductance between the first driving coil and the metal component, specifically: the movement distance of the first carrier is determined based on the first induced electromotive force detected by the first driving coil or the metal component; the first induced electromotive force is the induced electromotive force generated by the mutual inductance between the first driving coil and the metal component. The movement distance of the second carrier is determined based on the mutual inductance between the second driving coil and the metal component, specifically: the movement distance of the second carrier is determined based on the second induced electromotive force detected by the second driving coil or the metal component; the second induced electromotive force is the induced electromotive force generated by the mutual inductance between the second driving coil and the metal component. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 This is a three-dimensional structural diagram of a motor position detection structure according to an embodiment of this solution; Figure 2 This is an exploded structural diagram of a motor position detection structure according to an embodiment of this solution; Figure 3 This is a schematic diagram of the combination structure of the metal component and each drive coil of a motor position detection structure according to an embodiment of this solution; Figure 4 This is a schematic diagram of the metal component of a motor position detection structure according to an embodiment of this solution; Figure 5 This is a schematic diagram of the combined structure of a metal component and a driving magnet in a motor position detection structure according to an embodiment of this solution; Figure 6 This is a schematic diagram of another metal component in a motor position detection structure according to an embodiment of this solution; Figure 7 This is an exploded structural diagram of a motor position detection structure in another metal component case according to an embodiment of this solution.

[0017] Figure label: 11-First carrier; 12-Second carrier; 2-Circuit board; 3-Drive magnet; 41-First drive coil; 42-Second drive coil; 421-X-axis drive coil; 422-Y-axis drive coil; 5-Metal component; 51-Third electrical terminal; 6-Use the spring clip; 7-Suspension wire; 8 - Base; 81 - Base sheet metal; 9-IC chip. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this utility model to enable readers to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0019] The division of the following embodiments is for ease of description and should not constitute any limitation on the specific implementation of this utility model. The various embodiments can be combined with or referenced by each other without contradiction.

[0020] An embodiment of this utility model relates to a motor position detection structure, including: as follows Figure 1 The first carrier 11, the second carrier 12, and as shown Figure 2The circuit board 2 shown includes a driving magnet 3, a first driving coil 41, a second driving coil 42, and a metal part 5 fixedly mounted on a second carrier. At least a portion of the metal part 5 is bent to form an energized coil. The first driving coil 41 is mounted on the first carrier 11 and interacts with the driving magnet 3 to drive the first carrier 11 to move relative to the circuit board 2 in the focusing direction. The second driving coil 42 is mounted on the circuit board 2 and interacts with the driving magnet 3 to drive the second carrier 12 to move relative to the circuit board 2 in the shaking direction. The focusing direction is perpendicular to the shaking direction. When the first carrier 11 moves, the relative position of the first driving coil 41 and the metal part 5 changes, and the moving distance of the first carrier 11 is determined based on the mutual inductance between the first driving coil 41 and the metal part 5. When the second carrier 12 moves, the relative position of the second driving coil 42 and the metal part 5 changes, and the moving distance of the second carrier 12 is determined based on the mutual inductance between the second driving coil 42 and the metal part 5.

[0021] Specifically, taking the detection of movement distance in the direction of jitter as an example, the mutual inductance between the metal component and the second drive coil in this utility model will be explained: When the second carrier moves in a direction parallel to the circuit board surface, i.e., when the second carrier moves in the jitter direction, the metal part 5, being fixed to the second carrier, moves relative to the circuit board along with the second carrier. Since the second drive coil 42 is fixed relative to the circuit board, the metal part 5 experiences relative displacement with respect to the second drive coil 42 in the jitter direction. Current flows through the second drive coil 42, generating a magnetic field. As the metal part 5 moves relative to the second drive coil 42, it cuts magnetic field lines, generating a mutual inductance current. This mutual inductance current affects the electrical signal of the metal part 5. Similarly, the metal part 5 also generates a magnetic field when energized. When the metal part moves relative to the second drive coil, the second drive coil also cuts magnetic field lines, generating a mutual inductance current, which in turn affects the electrical signal of the second drive coil. By observing the influence of mutual inductance on the electrical signals of the metal part and the second drive coil, the relative distance of movement between the metal part and the second drive coil can be determined, thus determining the movement of the second carrier in the jitter direction.

[0022] When detecting the distance moved in the focusing direction, the mutual inductance between the metal part and the first drive coil is based on the same principle as that between the metal part and the second drive coil, and will not be elaborated here.

[0023] The motor position detection structure can also include a detection circuit to detect and determine the mutual inductance between the metal component and the first and second drive coils. For example, it can detect the induced electromotive force (EMF) of the metal component, or the induced EMF on the first and second drive coils. Before the structure leaves the factory, the correspondence between the lens position and the induced EMF is pre-calibrated. Therefore, after detecting the induced EMF, the corresponding lens position can be determined according to the calibration table.

[0024] Compared to existing technologies, this embodiment of the invention involves a first carrier moving relative to a circuit board in the focusing direction, and a second carrier moving relative to the circuit board in the shaking direction. Each direction of movement is equipped with a corresponding drive coil and drive magnet to provide driving force in different directions. A metal component is also fixedly mounted on the second carrier. An energized coil is formed by bending the metal component, and current flows through the metal component. When the first carrier moves, the relative position of the current-carrying first drive coil and the metal component changes, generating mutual inductance between them. The movement distance of the first carrier can be determined by the influence of this mutual inductance on the electrical signals of the first drive coil and the metal component. Similarly, when the second carrier moves, the relative position of the second drive coil and the metal component changes, generating mutual inductance between them. The movement distance of the second carrier can be determined by the influence of this mutual inductance on the electrical signals of the second drive coil and the metal component. This achieves the detection of the carrier's displacement in the focusing and shaking directions, thus determining the movement of the lens on the carrier. The aforementioned position detection structure only requires specific bending of the metal parts, without increasing the size of the motor. Furthermore, the bending process of the metal parts is simple and easy to operate, effectively controlling the manufacturing cost of the motor.

[0025] The metal part is an original structural component on the second carrier. For example, it can be a support for driving the magnet, or the metal part can be a spring-loaded structure. By changing the shape of the original metal structure, an electric coil can be formed without increasing the material cost.

[0026] When the metal component serves as a support for the driving magnet, it is embedded in the side wall of the second carrier. The metal component transmits electrical signals to the base sheet metal via a suspension wire, which then transmits the signals to a circuit board (such as an FPC). The circuit board (such as an FPC) then transmits the signals to the IC chip. Figure 3 As shown, the metal part 5 is bent sequentially through the four side walls of the second carrier to form a spiral structure. This spiral structure serves as a current-carrying coil, with its central axis aligned with both the focusing direction and the central axis of the second drive coil. To improve the sensitivity of the mutual inductance, the metal part can be positioned close to the circuit board, shortening the distance between the metal part and the second drive coil. Additionally, the first drive coil can be... Figure 3The first drive coil is positioned on the side wall of the first carrier, with its central axis perpendicular to the central axis of the metal component. Alternatively, the first drive coil can be positioned around the first carrier, in which case its central axis is parallel to the central axis of the metal component. Since the metal component is not a tightly coiled helical structure, the magnetic field it generates has components in both the focusing and shaking directions. Therefore, in both of these configurations, the first drive coil can generate mutual inductance with the metal component.

[0027] To increase the mutual inductance of metal components, the number of turns in the energized coil of the metal component can be increased. For example... Figure 4 As shown, a metal component is bent to form a coil that conducts electricity for one and a half turns. A third power terminal 51 is provided at the end of the metal component. The third power terminal 51 is connected to the IC chip 9 on the circuit board through the suspension wire 7, the base sheet metal 81, and realizes the power supply to the metal component. The complete power supply and signal transmission circuit of the metal component 5 is as follows: the external circuit sends control signals and power signals to the base sheet metal, which are then received by the IC chip via the circuit board. The signals are then transmitted through the internal circuitry of the circuit board, the base sheet metal, to the suspension wire, the metal sheet, another suspension wire, and then back to the IC chip via the internal circuitry of the circuit board through the base sheet metal connected to the suspension wire. The base sheet metal includes several mutually isolated metal segments to ensure that the signals are transmitted in a fixed direction and that the transmitted signals do not interfere with each other. While powering the metal component, the IC chip 9 can also collect the mutual inductance signals between the metal component, the first drive coil, and the second drive coil (including the X-axis drive coil and the Y-axis drive coil), and then process the mutual inductance signals to determine the movement distance of each carrier of the motor. The IC chip 9 can also process other signals according to the motor function, which will not be described in detail here.

[0028] like Figure 5 As shown, the driving magnet 3 includes a driving magnet in the focusing direction and a driving magnet in the shaking direction. The driving magnet in the focusing direction is positioned opposite to the first driving coil 41, and the driving magnet in the shaking direction is positioned opposite to the second driving coil 42. Figure 3 As shown, the movement in the jitter direction includes at least movement in the X-axis direction and movement in the Y-axis direction. The corresponding second drive coil 42 includes an X-axis drive coil 421 and a Y-axis drive coil 422. The drive magnet in the jitter direction includes an X-axis drive magnet and a Y-axis drive magnet. The X-axis drive coil 421 is positioned opposite to the X-axis drive magnet and is used to drive the second carrier to move in the X-axis direction. The Y-axis drive coil 422 is positioned opposite to the Y-axis drive magnet and is used to drive the second carrier to move in the Y-axis direction. Figure 5For example, the number of X-axis drive coils 421 can be set to two, and the two X-axis drive coils 421 are symmetrically arranged on both sides of the motor with respect to the Y-axis. The number of Y-axis drive coils 422 is set to one, and the Y-axis drive coil 422 is arranged on the adjacent side of the X-axis drive coil 421. In feasible embodiments, the number of Y-axis drive coils 422 can also be set to two, and the stability of the drive to the motor carrier is improved by the symmetrical structure. The number of drive magnets in the focusing direction can also be set according to the actual situation, for example, one or two. Taking two as an example, the two drive magnets in the focusing direction are symmetrical with respect to the X-axis or Y-axis, such as... Figure 5 As shown, when the driving magnet in the focusing direction is symmetrical with respect to the Y-axis, the driving magnet in the focusing direction can be positioned above the driving magnet in the X-axis.

[0029] Both the first and second drive coils are connected to the IC chip. The first drive coil includes a first power terminal; the second drive coil includes a second power terminal. Both the first and second power terminals are connected to the IC chip. The connection circuit between the first drive coil and the IC chip is as follows: after the external circuit sends control and power signals to the base sheet metal, the signals are received by the IC chip via the circuit board. The signals are then transmitted through the internal circuitry of the circuit board, the base sheet metal, to the suspension wire, the first drive coil, and another suspension wire. Finally, the signals are transmitted back to the IC chip via the internal circuitry of the circuit board through the base sheet metal connected to the suspension wire. Notably, the suspension wire in the first drive coil connection circuit is different from the suspension wire in the metal component connection circuit.

[0030] Since the second drive coil can be positioned close to the base, it can be directly electrically connected to the circuit board. The connection circuit between the second drive coil and the IC chip is as follows: the external circuit sends control and power signals to the base sheet metal, which are then received by the IC chip via the circuit board. The signals then flow through the circuit board's internal circuitry to the second drive coil, and then through the circuit board's internal circuitry connected to the second drive coil back to the IC chip.

[0031] The second drive coil includes an X-axis drive coil and a Y-axis drive coil. The connection circuits between the X-axis drive coil and the Y-axis drive coil and the IC chip both satisfy the above description of the connection circuit between the second drive coil and the IC chip, and the X-axis drive coil and the Y-axis drive coil are independent connection circuits.

[0032] The IC chip applies currents of different frequencies to the first drive coil, the X-axis drive coil, and the Y-axis drive coil through the first, second, and third terminals. Furthermore, the frequency at which the IC chip applies current to the metal component is different from the frequencies at which the currents are applied to the first, X-axis, and Y-axis drive coils. This IC chip can be a motor control chip IC. While applying current to the metal component and each drive coil, the control chip IC detects the mutual inductance current between the metal component and each drive coil. Based on the frequency of the mutual inductance current, a Fourier transform is used to calculate the mutual inductance current between the metal component and the first drive coil, and the mutual inductance current between the metal component and the second drive coil. Therefore, the moving distance of the first carrier is determined based on the mutual inductance current between the metal component and the first drive coil, and the moving distance of the second carrier is determined based on the mutual inductance current between the metal component and the second drive coil.

[0033] Alternatively, determining the moving distance of the first carrier based on the mutual inductance between the first driving coil and the metal component can also be achieved by: determining the moving distance of the first carrier based on the first induced electromotive force detected by the first driving coil or the metal component; the first induced electromotive force is the induced electromotive force generated by the mutual inductance between the first driving coil and the metal component; determining the moving distance of the second carrier based on the mutual inductance between the second driving coil and the metal component specifically involves: determining the moving distance of the second carrier based on the second induced electromotive force detected by the second driving coil or the metal component; the second induced electromotive force is the induced electromotive force generated by the mutual inductance between the second driving coil and the metal component. The aforementioned induced electromotive force is the induced electromotive force calculated based on the mutual inductance currents of different frequencies through Fourier transform.

[0034] When the second drive coil includes an X-axis drive coil and a Y-axis drive coil, it is necessary to calculate the movement distance in the X-axis direction, the movement distance in the Y-axis direction, and the movement distance in the focusing direction, respectively.

[0035] In another embodiment of the motor position detection structure of this utility model, when the metal part is a spring sheet, the metal part covers the bottom surface of the second carrier, such as... Figure 6 As shown, the metal component forms an energized coil through bending. Simultaneously, the metal component possesses a serpentine bending structure to increase its elasticity, allowing it to function as both a position detection structure and a spring-loaded structure to limit the movement of the second carrier. Specifically, as... Figure 7 As shown, the motor structure includes an upper spring sheet 6 and a bent metal part 5. The metal part serves as a lower spring sheet, which limits the movement of the second carrier. The upper spring sheet 6 is positioned above the second carrier, which also limits the movement of the second carrier.

[0036] This utility model also relates to an electronic device, including the above-described motor position detection structure.

[0037] Compared with related technologies, the electronic device provided in this embodiment of the present invention is equipped with the motor position detection structure provided in the aforementioned embodiment. Therefore, it also has the technical effects provided in the aforementioned embodiment, and will not be described in detail here.

[0038] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A position detection structure for a motor, characterized in that, include: A first carrier, a second carrier, a circuit board, a driving magnet, a first driving coil, a second driving coil, and a metal part fixedly disposed on the second carrier, wherein at least a portion of the metal part is bent to form an energized coil; The first driving coil is disposed on the first carrier, and the first driving coil interacts with the driving magnet to drive the first carrier to move relative to the circuit board in the focusing direction; The second drive coil is disposed on the circuit board, and the second drive coil interacts with the drive magnet to drive the second carrier to move relative to the circuit board in the shaking direction; the focusing direction is perpendicular to the shaking direction; When the first carrier moves, the relative position of the first driving coil and the metal part changes, and the moving distance of the first carrier is determined based on the mutual inductance between the first driving coil and the metal part; when the second carrier moves, the relative position of the second driving coil and the metal part changes, and the moving distance of the second carrier is determined based on the mutual inductance between the second driving coil and the metal part.

2. The motor position detection structure according to claim 1, characterized in that, The metal component is either a support for the driving magnet or a spring.

3. The position detection structure for the motor according to claim 2, characterized in that, When the metal component serves as a support for the driving magnet, the metal component is embedded in the side wall of the second carrier.

4. The motor position detection structure according to claim 3, characterized in that, The metal part is bent sequentially through the four side walls of the second carrier to form a spiral structure, and the spiral structure serves as the energized coil.

5. The motor position detection structure according to claim 2, characterized in that, When the metal component is a spring-loaded piece, the metal component covers the bottom surface of the second carrier.

6. The motor position detection structure according to claim 1, characterized in that, It also includes: suspension wire and base; The end of the metal part is connected to the suspension wire; The base is embedded with a base sheet metal; The metal component is connected to the base sheet metal via the suspension wire, and the base sheet metal is connected to the IC chip via the circuit board, with the IC chip integrated on the circuit board.

7. The motor position detection structure according to claim 1, characterized in that, Also includes: IC chips; The jitter direction includes the X-axis direction and the Y-axis direction; The first drive coil includes a first energized terminal; the second drive coil includes an X-axis drive coil and a Y-axis drive coil, both of which have a second energized terminal; the metal component includes a third energized terminal. The first power terminal, the second power terminal, and the third power terminal are all connected to the IC chip. The IC chip applies current of different frequencies to the first drive coil, the X-axis drive coil, and the Y-axis drive coil through the first power terminal, the second power terminal, and the third power terminal. Furthermore, the frequency at which the IC chip applies current to the metal component is different from the frequency at which the first drive coil, the X-axis drive coil, and the Y-axis drive coil apply current.

8. The motor position detection structure according to claim 7, characterized in that, The moving distance of the first carrier is determined based on the mutual inductance between the first driving coil and the metal component, specifically as follows: The moving distance of the first carrier is determined based on the first induced electromotive force detected by the first drive coil or the metal component; the first induced electromotive force is the induced electromotive force generated by the mutual inductance between the first drive coil and the metal component. The moving distance of the second carrier is determined based on the mutual inductance between the second driving coil and the metal component, specifically as follows: The moving distance of the second carrier is determined based on the second induced electromotive force detected by the second drive coil or the metal component; the second induced electromotive force is the induced electromotive force generated by the mutual inductance between the second drive coil and the metal component.

9. An electronic device, characterized in that, include: The position detection structure of the motor as described in any one of claims 1 to 8.

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