A suspension wire anti-shake motor and electronic device
By using an electric connection between the transmitting and receiving plates and the circuit board in a suspension wire anti-shake motor, and utilizing capacitive signals to detect the displacement of the mover, the problem of Hall sensors being affected by environmental magnetic fields is solved, achieving high-precision and low-cost displacement detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHIPSEMI SEMICON (NINGBO) CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-06-12
AI Technical Summary
Hall effect sensors are susceptible to the influence of ambient magnetic fields, resulting in low displacement detection accuracy and linearity of the suspension wire anti-shake motor, as well as high cost.
The transmitter and receiver plates are connected to the circuit board via different upper springs. The displacement of the mover is detected by using a capacitance signal, which reduces the influence of external electromagnetic signals and lowers costs.
It improves the accuracy of displacement detection and reduces costs by detecting the displacement of the mover through capacitive signals, thus reducing interference from external electromagnetic signals.
Smart Images
Figure CN224355980U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of camera technology, and in particular to a suspension wire anti-shake motor and electronic device. Background Technology
[0002] A suspension wire image stabilization motor creates a gap between the mover and the base by supporting a suspension wire, allowing the mover to shift in either the focusing or shake direction. To achieve accurate focusing and image stabilization, the mover's displacement needs to be measured. This displacement is typically detected using a combination of a magnet and a Hall effect sensor. However, Hall effect sensors are susceptible to ambient magnetic fields and are highly sensitive to changes in amplitude direction. Therefore, their accuracy and linearity under external magnetic field influences are not high enough, and they are also costly. Utility Model Content
[0003] The purpose of this utility model embodiment is to provide a suspension wire image stabilization motor and electronic device. By utilizing the upper spring structure and suspension wire structure of the suspension wire image stabilization motor to achieve electrical connection between the transmitting and receiving plates and the circuit board, the circuit connection is simplified. The capacitance signal generated by the transmitting and receiving plates is used for the detection of focus direction displacement. The capacitance signal is not easily affected by external electromagnetic signals, improving the accuracy of displacement detection results and reducing costs.
[0004] To solve the above-mentioned technical problems, embodiments of this utility model provide a suspension wire image stabilization motor, including: a first mover, a second mover, a suspension wire, an upper spring, a circuit board, a detection unit, and a base; the first mover undergoes relative displacement in the focusing direction; the second mover undergoes relative displacement in the shaking direction; wherein, the shaking direction is perpendicular to the focusing direction; the upper spring is used to connect the first mover and the second mover so that the first mover moves synchronously with the second mover in the shaking direction; the upper spring is electrically connected to the circuit board through the suspension wire; the detection unit includes: a receiving electrode plate disposed on the first mover, and a transmitting electrode plate disposed on the second mover, the transmitting electrode plate and the receiving electrode plate being disposed opposite to each other, and the transmitting electrode plate and the receiving electrode plate being electrically connected to the circuit board through different upper springs, and the displacement of the first mover in the focusing direction is detected based on the capacitance signal generated by the transmitting electrode plate and the receiving electrode plate.
[0005] An embodiment of this utility model also provides an electronic device, including the above-described suspension anti-shake motor.
[0006] Compared to existing technologies, this embodiment of the invention features a first mover and a second mover that move in different directions. The first mover moves in the focusing direction, while the second mover moves in the shaking direction. Electrical connections are established between the receiving electrode on the first mover and the transmitting electrode on the second mover via different upper spring plates and suspension wire structures within the motor. The transmitting and receiving electrodes are positioned opposite each other, and the displacement of the first mover in the focusing direction is detected based on the capacitance signals generated by the transmitting and receiving electrodes. The capacitance signals are less susceptible to external electromagnetic influences, improving the accuracy of displacement detection and reducing costs.
[0007] In addition, there are four upper spring plates, which are respectively set at the four corners of the suspension wire anti-shake motor, and the transmitting electrode plate and the receiving electrode plate are respectively connected to the upper spring plates adjacent to them.
[0008] In addition, there are four upper spring plates, which are respectively set at the four corners of the suspension wire anti-shake motor, and the transmitting electrode plate is connected to the upper spring plate that is farthest from the receiving electrode plate.
[0009] In addition, the upper spring piece connected to the emitting electrode plate includes: a first sub-component and a second sub-component spaced apart; the first sub-component is used to connect to the suspension wire and to be electrically connected to the emitting electrode plate; the second sub-component is used to connect the first mover and the second mover.
[0010] In addition, the distance between the first sub-component and the receiving electrode is greater than the distance between the second sub-component and the receiving electrode.
[0011] In addition, the transmitting electrode includes: a first electrode and a second electrode that are electrically connected to each other; the distance between the first electrode and the second electrode is constant; the receiving electrode is located between the first electrode and the second electrode; the capacitance signal of the receiving electrode is determined based on the first change in the area of the receiving electrode facing the first electrode and the second change in the area of the receiving electrode facing the second electrode.
[0012] In addition, both the first electrode plate and the second electrode plate are arranged parallel to the focusing direction.
[0013] In addition, the suspension wire anti-shake motor also includes: a drive unit; the drive unit includes a drive coil disposed on a first mover and a drive magnet disposed on a second mover; the drive unit is used to control the displacement of the first mover.
[0014] In addition, the suspension wire anti-shake motor also includes: a shaking receiving plate disposed on the circuit board; the shaking receiving plate and the transmitting plate together detect the displacement of the second mover in the shaking direction. 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 an exploded structural diagram of a suspension wire anti-shake motor according to an embodiment of this solution;
[0017] Figure 2 This is a top view structural diagram of a suspension wire anti-shake motor according to an embodiment of this solution;
[0018] Figure 3 This is a schematic diagram of the transmitting and receiving plates of a suspension wire anti-shake motor according to an embodiment of this solution;
[0019] Figure 4 This is a schematic diagram of the structure of a suspension anti-shake motor according to an embodiment of the present solution, showing how the capacitor signal changes with the direction of shaking.
[0020] Figure 5 This is a top view structural diagram of another suspension wire anti-shake motor according to an embodiment of this solution;
[0021] Figure 6 This is a schematic diagram of the transmitting and receiving plates of another suspension wire anti-shake motor according to an embodiment of this solution;
[0022] Figure 7 This is a schematic diagram of the structure of another suspension wire anti-shake motor according to an embodiment of this solution, showing how the capacitor signal changes with the direction of shaking.
[0023] Figure 8 This is a schematic diagram of the transmitting and receiving plates of another suspension wire anti-shake motor according to an embodiment of this solution. Detailed Implementation
[0024] 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.
[0025] 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 and referenced by each other without contradiction.
[0026] Embodiments of this utility model relate to a suspension wire anti-shake motor, such as... Figure 1 As shown, the suspension wire image stabilization motor includes: a base 1, a circuit board 2, a first mover 41, a second mover 42, a suspension wire 6, an upper spring 31, and a detection unit; the first mover 41 undergoes relative displacement in the focusing direction; the second mover 42 undergoes relative displacement in the shaking direction; wherein, the shaking direction is perpendicular to the focusing direction; the upper spring is used to connect the first mover and the second mover so that the first mover 41 moves synchronously with the second mover 42 in the shaking direction; the upper spring is electrically connected to the circuit board 2 through the suspension wire 6; the detection unit includes: a receiving electrode plate disposed on the first mover 41, and a transmitting electrode plate disposed on the second mover 42, the transmitting electrode plate and the receiving electrode plate being disposed opposite to each other, and the transmitting electrode plate and the receiving electrode plate being electrically connected to the circuit board 2 through different upper springs 31, and the displacement of the first mover in the focusing direction is detected based on the capacitance signal generated by the transmitting electrode plate and the receiving electrode plate.
[0027] Compared to existing technologies, this embodiment of the invention features a first mover and a second mover that move in different directions. The first mover moves in the focusing direction, while the second mover moves in the shaking direction. Electrical connections are established between the receiving electrode on the first mover and the transmitting electrode on the second mover via different upper spring plates and suspension wire structures within the motor. The transmitting and receiving electrodes are positioned opposite each other, and the displacement of the first mover in the focusing direction is detected based on the capacitance signals generated by the transmitting and receiving electrodes. The capacitance signals are less susceptible to external electromagnetic influences, improving the accuracy of displacement detection and reducing costs.
[0028] In addition, such as Figure 2 As shown, there are four upper spring pieces 31, which are respectively set at the four corners of the suspension wire anti-shake motor. The four upper spring pieces 31 are spaced apart and electrically separated from each other. The transmitting plate and the receiving plate are respectively connected to the upper spring pieces adjacent to them. The upper spring pieces connected to the transmitting plate and the receiving plate are different, which can realize the separate transmission and collection of signals from the transmitting plate and the receiving plate. Choosing the adjacent upper spring piece as the conductive structure can facilitate the electrical connection between the transmitting plate or the receiving plate and the upper spring piece. If sheet metal circuits are used to realize the electrical connection between the transmitting plate or the receiving plate and the upper spring piece, shorter sheet metal circuits can be used, and shorter sheet metal circuits will increase the strength and stability of the electrical connection. Under repeated movement of the first or second mover, shorter sheet metal circuits are less likely to be damaged.
[0029] In addition to the aforementioned connection methods between the transmitting or receiving electrode and the upper spring sheet, another method involves having four upper spring sheets positioned at the four corners of the suspension wire anti-shake motor, with the transmitting electrode connected to the upper spring sheet furthest from the receiving electrode. When the transmitting electrode is energized, the upper spring sheet connected to it is also energized. This upper spring sheet connected to the transmitting electrode may cause crosstalk to the signal from the receiving electrode. Therefore, selecting the upper spring sheet connected to the transmitting electrode at the furthest distance from the receiving electrode can effectively reduce crosstalk and improve the accuracy of the detection results.
[0030] like Figure 2 As shown, the upper spring is fixed by a first protrusion 411 on the first moving part and a second protrusion 421 on the second moving part. When the upper spring is a complete and independent structure, the number of the first protrusion 411 can be set to one and the number of the second protrusion 421 can be set to two.
[0031] The positional relationship between the transmitting electrode 51 and the receiving electrode 52 is as follows: Figure 3 As shown, there is a facing area between the emitting electrode 51 and the receiving electrode 52. When the first mover moves relative to the second mover in the focusing direction, the receiving electrode 52 moves along with the first mover in the focusing direction, causing the facing area between the emitting electrode 51 and the receiving electrode 52 to change. This changes the capacitance value formed by the emitting and receiving electrodes, and the electrical signal generated by the receiving electrode 52 changes accordingly. The displacement of the first mover can be determined based on the change in capacitance value or the change in the electrical signal generated by the receiving electrode.
[0032] The capacitance formed by the transmitting and receiving plates is calculated using the physical formula for a parallel-plate capacitor: C = εS / 4πkd; where ε represents the dielectric constant of the medium, determined by the medium between the transmitting and receiving plates, such as air or water; and k represents the electrostatic constant, also known as the Coulomb constant, which indicates that the force between two point charges, each with a charge of 1C, separated by a distance of 1m in a vacuum is 8.987551 × 10⁻⁶. 9 N, i.e., k = 8.987551 × 10 9 N·m 2 / C; S represents the area of the two plates facing each other; d represents the vertical distance between the two plates. When the area of the two plates facing each other changes, the capacitance signal changes accordingly. Therefore, the distance the first mover moves in the focusing direction can be determined from the change in the capacitance signal.
[0033] like Figure 4The diagram illustrates the change in capacitance signal as the second mover moves along the Y-axis when the distance between the upper contact spring connecting the transmitting plate and the receiving plate is relatively short. It can be seen that when the second mover moves ±140 micrometers (µm) along the Y-axis, the AF capacitance changes by 7 fF. Since the sensitivity of the AF is 0.4 fF / µm, this translates to a travel distance of 7 / 0.4 = 17.5 µm. This means that the Y-axis movement (OISY) of the second mover causes a crosstalk of 17.5 µm to the AF capacitance, which is relatively significant. Therefore, to address this crosstalk, the contact spring circuits of the transmitting and receiving plates are typically moved to opposite sides, reducing the initial parasitic capacitance between the contact spring and the plates, thereby decreasing crosstalk.
[0034] In addition, the structure of the upper spring can be adjusted to solve the crosstalk problem. For example... Figure 5 As shown, the upper spring piece connected to the transmitting electrode includes: a first sub-component 311 and a second sub-component 312 spaced apart; the first sub-component 311 is used to connect to the suspension wire and is electrically connected to the transmitting electrode; the second sub-component 312 is used to connect the first mover and the second mover. The distance between the first sub-component and the receiving electrode is greater than the distance between the second sub-component and the receiving electrode.
[0035] Furthermore, to ensure the connectivity of the upper spring structure for the synchronous movement of the first and second movers in the jitter direction, an additional second protrusion 421 can be provided on the second mover, resulting in three second protrusions 421 on the second mover and one first protrusion 411 on the first mover. Two of the second protrusions 421 are used to fix the first sub-component 311, which is only used for electrical connection of the transmitting electrode plate and not for linkage connection between the first and second movers. The remaining second protrusion 421, together with the first protrusion 411, fixes the second sub-component. The second mover connected by the first and second protrusions enables linkage connection between the first and second movers.
[0036] The above-mentioned scheme of dividing the upper spring sheet into a first sub-component and a second sub-component can be used in conjunction with upper spring sheets in different positions as electrical connectors. For example, the upper spring sheet near the transmitting electrode and the receiving electrode can be used as an electrical connector, and the upper spring sheet used as an electrical connector can be divided. This can shorten the length of the sheet metal between the connecting electrode and the upper spring sheet, and also reduce the influence of the upper spring sheet on the signal of the receiving electrode.
[0037] like Figure 6 As shown, after the upper spring is divided into two parts, the first sub-component 311, which is farther away from the receiving electrode 52, is charged, but the second sub-component 312, which is closer to the receiving electrode 52, is not charged, which can reduce the interference of the charged upper spring on the signal of the receiving electrode.
[0038] like Figure 7The diagram shows the change in capacitance signal as the second mover moves along the Y-axis under the separated upper spring structure. It can be seen that when the second mover moves ±140µm along the Y-axis, the change in AF capacitance drops to 3fF, while the sensitivity of AF is 0.4fF / µm. Converted to stroke, 3 / 0.4 = 7.5µm. Compared to the complete upper spring structure mentioned above, the crosstalk of the AF capacitance caused by the movement of the second mover in the Y-axis direction (OISY) is reduced to 7.5µm, and the crosstalk effect is significantly reduced, which is even better after software compensation.
[0039] In addition, such as Figure 8 As shown, the emitting electrode includes a first electrode 511 and a second electrode 512 electrically connected to each other; the distance between the first electrode 511 and the second electrode 512 is constant; the receiving electrode 52 is located between the first electrode 511 and the second electrode 512; the capacitance signal of the receiving electrode is determined based on the first change in the area of the receiving electrode relative to the first electrode and the second change in the area of the receiving electrode relative to the second electrode. Both the first and second electrodes are arranged parallel to the focusing direction. This design ensures that the distance between the first and second electrodes of the emitting electrode remains constant. If the first or second mover deviates from its original position due to oscillation during use, although the relative position of the receiving electrode relative to the first or second electrode changes, the first sub-capacitance generated by the receiving electrode relative to the first electrode and the second sub-capacitance generated by the receiving electrode relative to the second electrode can be considered comprehensively to offset the deviation in capacitance signal caused by the positional deviation between the receiving electrode and the emitting electrode due to external factors, thus ensuring the accuracy of the detection results.
[0040] In addition, the suspension wire anti-shake motor also includes: a drive unit; the drive unit includes a drive coil disposed on the first mover and a drive magnet disposed on the second mover; the drive unit is used to control the displacement of the first mover.
[0041] In addition, the suspension wire anti-shake motor also includes: a shaking receiving plate mounted on the circuit board; the shaking receiving plate and the transmitting plate together detect the displacement of the second mover in the shaking direction.
[0042] In addition, such as Figure 1 As shown, the suspension wire anti-shake motor also includes: a lower spring 32 disposed below the first mover and the second mover, the upper spring and the lower spring cooperating to reset the first mover. Surrounding the first mover and the second mover is also a housing 7, which protects the internal components.
[0043] Another feasible embodiment of this utility model relates to an electronic device, including the suspension wire image stabilization motor as described above. The suspension wire image stabilization motor is used in conjunction with a lens to achieve image acquisition and automatically calibrate against vibrations from the external environment, thereby improving the quality of image acquisition.
[0044] Compared with related technologies, the electronic device provided in this embodiment of the present invention is equipped with the suspension anti-shake motor provided in the aforementioned embodiment. Therefore, it also has the technical effects provided in the aforementioned embodiment, which will not be elaborated here.
[0045] 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 suspension wire anti-vibration motor, characterized in that, include: First mover, second mover, suspension wire, upper spring, circuit board, detection unit and base; The first mover undergoes relative displacement in the focusing direction; The second moving element undergoes a relative displacement in the shaking direction; wherein, the shaking direction is perpendicular to the focusing direction; The upper spring is used to connect the first mover and the second mover so that the first mover moves synchronously with the second mover in the jitter direction; The upper spring sheet is electrically connected to the circuit board via the suspension wire; The detection unit includes: a receiving electrode plate disposed on the first moving part and a transmitting electrode plate disposed on the second moving part. The transmitting electrode plate and the receiving electrode plate are disposed opposite to each other, and the transmitting electrode plate and the receiving electrode plate are electrically connected to the circuit board through different upper springs. The displacement of the first moving part in the focusing direction is detected based on the capacitance signal generated by the transmitting electrode plate and the receiving electrode plate.
2. The suspension wire anti-vibration motor according to claim 1, characterized in that, The number of upper spring plates is four, which are respectively set at the four corners of the suspension wire anti-shake motor. The transmitting electrode plate and the receiving electrode plate are respectively connected to the upper spring plates adjacent to them.
3. The suspension wire anti-vibration motor according to claim 1, characterized in that, The number of upper spring plates is four, which are respectively set at the four corners of the suspension wire anti-shake motor. The transmitting electrode plate is connected to the upper spring plate that is farthest from the receiving electrode plate.
4. The suspension wire anti-vibration motor according to any one of claims 1 to 3, characterized in that, The upper spring piece connected to the transmitting electrode plate includes: a first sub-component and a second sub-component arranged at intervals; The first sub-component is used to connect to the suspension wire and to be electrically connected to the emitting electrode plate; The second component is used to connect the first mover and the second mover.
5. The suspension wire anti-vibration motor according to claim 4, characterized in that, The distance between the first sub-component and the receiving electrode is greater than the distance between the second sub-component and the receiving electrode.
6. The suspension wire anti-vibration motor according to claim 1, characterized in that, The emitting electrode includes: a first electrode and a second electrode that are electrically connected to each other; The distance between the first electrode plate and the second electrode plate is constant; The receiving electrode is located between the first electrode and the second electrode; The capacitance signal of the receiving electrode is determined based on the first change in the area of the receiving electrode and the first electrode, and the second change in the area of the receiving electrode and the second electrode.
7. The suspension wire anti-vibration motor according to claim 6, characterized in that, Both the first electrode plate and the second electrode plate are arranged parallel to the focusing direction.
8. The suspension wire anti-vibration motor according to claim 6, characterized in that, Also includes: Drive unit; The driving unit includes a driving coil disposed on a first moving part and a driving magnet disposed on a second moving part; The displacement of the first mover is controlled by the drive unit.
9. The suspension wire anti-vibration motor according to claim 1, characterized in that, Also includes: A jitter receiving electrode plate mounted on a circuit board; The jitter receiving plate and the transmitting plate together detect the displacement of the second mover in the jitter direction.
10. An electronic device, characterized in that, include: The suspension wire anti-vibration motor as described in any one of claims 1 to 9.