Rotation detection assembly, camera module and electronic device

Abstract

SUMMARY OF THE DISCLOSURE The embodiments of the present application relate to the field of microelectronics and disclose a rotation detection assembly, a camera module, and an electronic device. [Solution] The rotation detection assembly includes a first electrode plate, a second electrode plate, a third electrode plate, and a detection unit, wherein the first electrode plate is fixed to a first detection surface of the assembly to be detected, and the second electrode plate and the third electrode plate are fixed to the second detection surface, and when the first detection surface and the second detection surface move in a plane in which they are respectively located, the facing area between the first electrode plate and the second electrode plate and the facing area between the first electrode plate and the third electrode plate do not change, and the detection unit is electrically connected to the first electrode plate, the second electrode plate, and the third electrode plate respectively, and is used to obtain a capacitance value between the first electrode plate and the second electrode plate and a capacitance value between the first electrode plate and the third electrode plate, and to determine whether relative rotation occurs between the first detection surface and the second detection surface based on the obtained capacitance values.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application is filed based on and claims priority to Chinese patent application "Rotation Detection Assembly, Camera Module and Electronic Device" bearing application number 202310316407.4 and filing date March 23, 2023, the entire disclosure of which is incorporated herein by reference.

[0002] FIELD OF THEINVENTION The present application relates to the field of microelectronics technology, and in particular to rotation detection assemblies, camera modules and electronic devices. [Background technology]

[0003] Camera shake is a universal phenomenon that cannot be tolerated in precision modules, and any physical impact, even changes in temperature and humidity, can cause camera shake. Take a camera module as an example, the image sensor is the core component of the camera module, and can use the photoelectric conversion function of the photoelectric device to convert the optical signal on the photosensitive surface into an electrical signal with a corresponding proportional relationship, that is, convert the optical image into an electronic signal. Since the image sensor faces the problem of camera shake, most camera modules in current electronic devices are equipped with an optical image stabilization function, and use optical image stabilization technology to compensate for the optical path during camera shake and improve the imaging quality of the camera module.

[0004] However, in the structural installation of precision modules such as camera modules in the industry, position detection can only be performed for the translational movement of important components (e.g., image sensors) in the XY plane. However, hand shake not only involves translational movement in the XY plane, but also rotation around the vertical optical axis (Z axis), and rotation around the Z axis cannot be detected properly. Hand shake changes the distance between some of the important components, and such changes in distance can significantly reduce the accuracy of rotation detection and may affect the normal operation of the precision module. Summary of the Invention

[0005] In the present embodiment, a rotation detection assembly, a camera module, and electronics are provided.

[0006] In an embodiment of the present application, a rotation detection assembly is provided, the rotation detection assembly including a first plate, a second plate, a third plate, and a detection unit, the first plate is fixed to a first detection surface of a detection target assembly, the second plate and the third plate are both fixed to a second detection surface parallel to the first detection surface, the first plate and the second plate face each other at a first angle, the first plate and the third plate face each other at a second angle not equal to the first angle, and the first detection surface and the second detection surface are translated on a plane on which they are located, When the first electrode plate and the second electrode plate are in a rotating state, the facing area between the first electrode plate and the second electrode plate and the facing area between the first electrode plate and the third electrode plate do not change, and the detection unit is electrically connected to the first electrode plate, the second electrode plate, and the third electrode plate, respectively, and is used to obtain a capacitance value between the first electrode plate and the second electrode plate and a capacitance value between the first electrode plate and the third electrode plate, and to determine whether a relative rotation occurs between the first detection surface and the second detection surface based on the capacitance values ​​obtained in the current state and the initial state.

[0007] In the present embodiment, a camera module is further provided, which includes a base, a flexible circuit board, an image sensor, and the above-mentioned rotation detection assembly, wherein the image sensor is mounted on the flexible circuit board, the first detection surface is the base, the second detection surface is the flexible circuit board, and the detection unit is integrated on the flexible circuit board.

[0008] In an embodiment of the present invention, an electronic device including at least the above-described camera module is provided.

[0009] Also, the first angle is an acute angle and the second angle is an obtuse angle, or the first angle is an obtuse angle and the second angle is an acute angle.

[0010] In addition, the first plate, the second plate, and the third plate are all rectangular, the width of the first plate is smaller than the length of the second plate, the width of the first plate is also smaller than the length of the third plate, the width of the second plate is smaller than the length of the first plate, and the width of the third plate is also smaller than the length of the third plate.

[0011] Furthermore, the second plate and the third plate are the same complete plate, the first plate has a first openwork rectangle, the complete plate has a second openwork rectangle and a third openwork rectangle, the width of the first rectangle is smaller than the length of the second rectangle, the width of the first rectangle is also smaller than the length of the third rectangle, the width of the second rectangle is smaller than the length of the first rectangle, the width of the third rectangle is also smaller than the length of the first rectangle, and when a relative translation and / or relative rotation occurs between the first detection surface and the second detection surface, the projection of the edge of the complete plate on the first detection surface is always within the range of the edge of the first plate.

[0012] In addition, there are a plurality of the first plates, and the plurality of first plates are arranged parallel to the first detection surface, the second plate and each of the first plates have a facing area, and the third plate and each of the first plates also have a facing area.

[0013] In addition, the first detection surface is fixed on a plane on which it is located, and after the detection unit determines that a relative rotation occurs between the first detection surface and the second detection surface, it is also used to determine a rotation angle corresponding to the second detection surface based on each capacitance value acquired in a current state, the width of the second plate, and the width of the third plate.

[0014] In addition, the device to which the detection target assembly belongs is provided with a gyroscope for acquiring a world rotation angle of the device to which the detection target assembly belongs, and the rotation detection assembly further includes an acquisition unit and a driving unit, a communication connection is established between the acquisition unit and the gyroscope, a communication connection is established between the driving unit and the acquisition unit and the detection unit, and a structural connection is installed between the driving unit and the second detection surface, the acquisition unit is used for acquiring the world rotation angle from the gyroscope, and the driving unit is used for predicting the future based on the world rotation angle. The detection unit is used to drive the second detection surface to rotate and further drive the second detection surface to rotate relative to the first detection surface, and after determining a rotation angle corresponding to the second detection surface, the detection unit is further used to determine whether a difference between an absolute value of the rotation angle and an absolute value of a rotation angle corresponding to the second detection surface is zero, and if the difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface is zero, the detection unit is also used to stop driving the second detection surface to rotate in the reverse direction after receiving the stop command.

[0015] In addition, the detection unit is further used to send a continuous operation command to the driving unit when a difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface is not zero, and the continuous operation command is equipped with the difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface, and the driving unit is further used to continue driving to rotate the second detection surface based on the difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface after receiving the continuous operation command.

[0016] In addition, the rotation detection assembly further includes a drive unit, a communication connection is established between the drive unit and the detection unit, and a structural connection is also installed between the drive unit and the second detection surface, and the drive unit is used to drive the second detection surface to rotate in a reverse direction based on a rotation angle corresponding to the second detection surface, so as to eliminate the relative rotation occurring between the first detection surface and the second detection surface.

[0017] Furthermore, the maximum rotation angle of the second detection surface rotates at a predetermined angle in a clockwise or counterclockwise direction, the predetermined angle being smaller than the first angle and smaller than the second angle, and the drive unit specifically rotates the second detection surface clockwise at the rotation angle corresponding to the second detection surface when the rotation angle corresponding to the second detection surface is positive, and rotates the second detection surface counterclockwise at the rotation angle corresponding to the second detection surface when the rotation angle corresponding to the second detection surface is negative. [Brief description of the drawings]

[0018] One or more embodiments are illustrated by way of example only through the figures in the accompanying drawings, and these illustrative illustrations are not intended to be limiting of the embodiments. [Figure 1] FIG. 1 is a cross-sectional view of a rotation sensing assembly according to one embodiment of the present application. [Diagram 2]FIG. 2 is a diagram showing a relative positional relationship between a first electrode plate, a second electrode plate, and a third electrode plate of a rotation detection assembly according to an embodiment of the present application. [Diagram 3] FIG. 3 is a diagram showing a first electrode plate, a second electrode plate, and a third electrode plate of another rotation detection assembly according to an embodiment of the present application, and a relative positional relationship between the first electrode plate, the second electrode plate, and the third electrode plate. [Figure 4] FIG. 4 is a diagram showing a plurality of first, second and third pole plates of a rotation detection assembly according to one embodiment of the present application, and the relative positional relationship between each of the first, second and third pole plates. [Diagram 5] FIG. 5 is a cross-sectional view 2 of a rotation sensing assembly according to one embodiment of the present application. [Figure 6] FIG. 6 is a cross-sectional view 3 of a rotation sensing assembly according to one embodiment of the present application. [Figure 7] FIG. 7 is a diagram showing a camera module according to another embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] As can be seen from the background art, current rotation detection assemblies, camera modules and electronic devices are affected by distance changes in the precision module, and cannot accurately detect whether important components in the precision module have rotated, making it impossible to ensure that the precision module operates normally.

[0020] In the rotation detection assembly, camera module, and electronic device according to the embodiments of the present application, a first plate of the rotation detection assembly is fixed to a first detection surface of an assembly to be detected, and a second plate and a third plate are both fixed to a second detection surface parallel to the first detection surface, the first plate and the second plate face each other at a first angle, and the first plate and the third plate face each other at a second angle not equal to the first angle, and when the first detection surface and the second detection surface are translated on a plane on which they are respectively located, the facing area between the first plate and the second plate and the facing area between the first plate and the third plate do not change, and a detection unit of the rotation detection assembly is electrically connected to the first plate, the second plate, and the third plate, respectively, and is used to obtain a capacitance value between the first plate and the second plate and a capacitance value between the first plate and the third plate, and to determine whether a relative rotation occurs between the first detection surface and the second detection surface based on the capacitance values ​​obtained in the current state and the initial state. From the viewpoint that the translation on the plane on which each of the detection surfaces is located does not affect the facing area between the first plate and the second plate and the facing area between the first plate and the third plate, in terms of capacitance, the capacitance value does not change; on the other hand, when a relative rotation occurs between the first detection surface and the second detection surface, the facing area between the first plate and the second plate and the facing area between the first plate and the third plate changes, in terms of capacitance, the capacitance value changes; at the same time, because the two plates on the second detection surface are arranged at different angles, even if the distance between the first detection surface and the second detection surface changes, it is offset during the calculation of the capacitance value, so that by detecting the capacitance value, it can be accurately detected whether important components in the precision module are rotating, and the precision module can operate normally.

[0021] The first angle is an acute angle and the second angle is an obtuse angle, or the first angle is an obtuse angle and the second angle is an acute angle. By setting the first angle to an acute angle and the second angle to an obtuse angle, or by setting the first angle to an obtuse angle and the second angle to an acute angle, it is possible to prevent the two capacitance values ​​from increasing or decreasing at the same time, and to perform more accurate rotation detection.

[0022] In addition, the first plate, the second plate, and the third plate are all rectangular, the width of the first plate is smaller than the length of the second plate, the width of the first plate and the length of the third plate are also smaller, the width of the second plate is smaller than the length of the first plate, and the width of the third plate is also smaller than the length of the third plate. By adopting rectangular plates, it is possible to ensure that the opposing portions of the first plate and the second plate are parallelograms, and it is possible to ensure that the opposing portions of the first plate and the third plate are parallelograms, and the accuracy of rotation detection can be further improved.

[0023] Moreover, the second and third plates are identical complete plates, the first plate is provided with a first openwork rectangle, the complete plate is provided with a second openwork rectangle and a third openwork rectangle, the width of the first rectangle is smaller than the length of the second rectangle, the width of the first rectangle is also smaller than the length of the third rectangle, the width of the second rectangle is also smaller than the length of the first rectangle, and the width of the third rectangle is also smaller than the length of the first rectangle. When a relative translation and / or a relative rotation occurs between the first and second detection surfaces, the projection of the edge of the complete plate on the first detection surface is always within the range of the edge of the first plate.

[0024] In addition, there are a plurality of first plates, the plurality of first plates are installed parallel to the first detection surface, the second plate and each of the first plates have a facing area, and the third plate and each of the first plates also have a facing area. By increasing the number of plates, the capacitive signal can be amplified, and the accuracy of rotation detection can be further improved.

[0025] In addition, the first detection surface is fixed on a plane on which it is located, and the detection unit is also used to determine a rotation angle corresponding to the second detection surface based on each capacitance value acquired in the current state, the width of the second plate, and the width of the third plate after determining that a relative rotation occurs between the first detection surface and the second detection surface. After determining that the second detection surface has rotated relative to the first detection surface, the rotation detection assembly can further determine the rotation angle of the second detection surface, and provide technical support for subsequent rotation correction, position correction, etc.

[0026] The device to which the assembly to be detected belongs is provided with a gyroscope for acquiring a world rotation angle of the device to which the assembly to be detected belongs. The rotation detection assembly further includes an acquisition unit and a driving unit, where a communication connection is established between the acquisition unit and the gyroscope, a communication connection is established between the driving unit and the acquisition unit and the detection unit, and a structural connection is provided between the driving unit and the second detection surface. The acquisition unit is used to acquire the world rotation angle from the gyroscope, and the driving unit is used to drive the second detection surface to rotate based on the world rotation angle, and further drive the second detection surface to rotate relative to the first detection surface. After determining the rotation angle corresponding to the second detection surface, the detection unit is further used to determine whether a difference between an absolute value of the rotation angle and an absolute value of the rotation angle corresponding to the second detection surface is zero, and if the difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface is zero, send a stop command to the driving unit. The driving unit is also used to stop driving the second detection surface to rotate in the reverse direction after receiving the stop command. When the device to which the assembly to be detected belongs rotates, the entire device rotates in the world coordinate system, and for the assembly to be detected to operate normally, it is necessary that the second detection surface does not rotate relative to the world coordinate system. Therefore, the drive unit of the rotating detection assembly can rotate the second detection surface in the opposite direction so that the assembly to be detected and the device to which it belongs can operate normally.

[0027] In addition, the detection unit is further used for sending a continuous operation command to the driving unit when the difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface is not zero, and the continuous operation command is loaded with the difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface. After receiving the continuous operation command, the driving unit is further used for continuing to drive the second detection surface to rotate based on the difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface. If the difference between the absolute value of the world rotation angle and the absolute value of the rotation angle corresponding to the second detection surface is not zero, it indicates that the driving unit is insufficiently or overly corrected, so that the detection unit needs to continue to adjust until it detects that the difference between the absolute value of the world rotation angle and the absolute value of the rotation angle corresponding to the second detection surface becomes zero.

[0028] The rotation detection assembly further includes a drive unit, a communication connection is established between the drive unit and the detection unit, and a structural connection is also provided between the drive unit and the second detection surface. The drive unit is used for driving the second detection surface to rotate in a reverse direction based on a rotation angle corresponding to the second detection surface, so as to eliminate the relative rotation occurring between the first detection surface and the second detection surface. In some scenarios, such rotation is an unacceptable hand shake, so that the relative rotation between the first detection surface and the second detection surface can be reversed to eliminate the hand shake caused by the rotation.

[0029] In addition, the maximum rotation angle of the second detection surface is a predetermined angle that rotates clockwise or counterclockwise, and the predetermined angle is smaller than the first angle and smaller than the second angle. Specifically, the driving unit rotates the second detection surface clockwise at the rotation angle corresponding to the second detection surface when the rotation angle corresponding to the second detection surface is positive, and rotates the second detection surface counterclockwise at the rotation angle corresponding to the second detection surface when the rotation angle corresponding to the second detection surface is negative. By limiting the predetermined angle, the rotation direction of the second detection surface can be made clear, and the elimination of the rotation can be completed by directly rotating in the opposite direction, so that the efficiency and accuracy of the rotation detection can be further improved.

[0030] In order to clarify the purpose, technical solution and advantages of the embodiments of the present application, the embodiments of the present application will be described in detail with reference to the drawings. However, those skilled in the art will understand that many technical details are proposed in the embodiments of the present application to allow the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution that the present application is intended to protect can be realized. The division of the following embodiments is for convenience and does not constitute any limitation on the specific embodiments of the present application, and the embodiments can be combined with each other for reference on the premise that there is no contradiction.

[0031] One embodiment of the present application relates to a rotation detection assembly, and the following describes in detail the implementation details of the rotation detection assembly according to the embodiment, and the following content is only for easy understanding of the implementation details provided, and is not essential for carrying out the present invention. As shown in Fig. 1, the cross section of the rotation detection assembly according to the present embodiment includes a first electrode plate 101, a second electrode plate 102, a third electrode plate 103, and a detection unit 104, and for convenience of explaining the positional relationship, Fig. 1 also shows a first detection surface 201 and a second detection surface 202 used in conjunction with the rotation detection assembly.

[0032] The first electrode plate 101 is fixed to a first detection surface 201 of the assembly to be detected, and the second electrode plate 102 and the third electrode plate 103 are both fixed to a second detection surface 202 parallel to the first detection surface 201, the first electrode plate 101 and the second electrode plate 102 face each other at a first angle, and the first electrode plate 101 and the third electrode plate 103 face each other at a second angle not equal to the first angle, and when the first detection surface 201 and the second detection surface 202 move in a translational manner on the plane in which they are respectively located, the facing area between the first electrode plate 101 and the second electrode plate 102 and the facing area between the first electrode plate 101 and the third electrode plate 103 do not change.

[0033] Specifically, the relative positional relationship between the first electrode plate, the second electrode plate, and the third electrode plate is shown in FIG. 2. FIG. 2 does not show the first detection surface and the second detection surface. There is a direct facing between the first electrode plate 101, the second electrode plate 102, and the third electrode plate 103. In other words, there is an overlapping portion between the projection of the second electrode plate 102 on the first detection surface and the first electrode plate 101, and there is also an overlapping portion between the projection of the third electrode plate 103 on the first detection surface and the first electrode plate 101. An electric capacitance is generated between the first electrode plate 101 and the second electrode plate 102 due to the direct facing between them, and an electric capacitance is generated between the first electrode plate 101 and the third electrode plate 103 due to the direct facing between them. The second plate 102 and the first plate 101 face each other at a first angle, which is denoted as a degrees, i.e., the projection of the second plate 102 on the first detection surface and the first plate 101 form an angle of a degrees. The third plate 103 and the first plate 101 face each other at a second angle, which is denoted as b degrees, i.e., the projection of the third plate 103 on the first detection surface and the first plate 101 form an angle of b degrees.

[0034] As can be seen, when the first detection surface and the second detection surface are translated in their respective planes, the facing area between the first electrode plate 101 and the second electrode plate 102 does not change, and the facing area between the first electrode plate 101 and the third electrode plate 103 does not change either. The dashed frame in Fig. 2 indicates that when the second detection surface is translated in the plane in which it is located, the second electrode plate 102 also translates accordingly, but the facing area between the second electrode plate 102 and the first electrode plate 101 before the translation and the facing area between the second electrode plate 102 and the first electrode plate 101 after the translation do not change.

[0035] In some examples, both the first and second sensing surfaces can translate and rotate within a plane in which they lie.

[0036] In some examples, the first detection surface is relatively fixed within the plane in which it lies, i.e., the first detection surface cannot translate or rotate within the plane in which it lies, but the second detection surface can translate and rotate within the plane in which it lies.

[0037] In some examples, the second detection surface is relatively fixed within the plane in which it lies, i.e., the second detection surface cannot translate or rotate within the plane in which it lies, but the first detection surface can translate and rotate within the plane in which it lies.

[0038] In some examples, the first angle is an acute angle and the second angle is an obtuse angle, or the first angle is an obtuse angle and the second angle is an acute angle. In FIG. 2, the first angle is an acute angle and the second angle is an obtuse angle. With such settings, it is possible to prevent the two capacitance values ​​from increasing and decreasing simultaneously when the detection surfaces rotate relatively, and it is possible to perform more accurate rotation detection.

[0039] The detection unit 104 is electrically connected to the first electrode plate 101, the second electrode plate 102, and the third electrode plate 103, respectively, and is used to obtain a capacitance value between the first electrode plate 101 and the second electrode plate 102 and a capacitance value between the first electrode plate 101 and the third electrode plate 103, and to determine whether relative rotation occurs between the first detection surface and the second detection surface based on the capacitance values ​​obtained in the current state and the initial state.

[0040] Specifically, the formula for calculating capacitance is C = εS / (4πkd), where ε is the dielectric constant, k is the electrostatic force constant, d is the distance between the two plates (considered to be the distance between the first detection surface and the second detection surface), and S is the opposing area between the two plates. Since ε and k are fixed, the factors that affect changes in the capacitance value are d and S. The detection unit first obtains the capacitance value between the first plate and the second plate and the capacitance value between the first plate and the third plate in the initial state, and these two capacitance values ​​are initial capacitance values. At this time, neither the first detection surface nor the second detection surface undergoes translation, rotation or distance change, that is, the initial capacitance value between the first plate and the second plate is C1=εS1 / (4πkd), and the initial capacitance value between the first plate and the third plate is C2=εS2 / (4πkd), and calculates the initial reference amount Ccal1=(C1-C2) / (C1+C2). After parameter offsetting, it can be calculated that the initial reference amount Ccal1=(S1-S2) / (S1+S2). During detection, the detection unit obtains the current capacitance value C3=εS3 / (4πkd') between the first plate and the second plate under the current state and the current capacitance value C4=εS4 / (4πkd') between the first plate and the third plate under the current state respectively, calculates the current reference quantity Ccal2=(C3-C4) / (C3+C4), and after offsetting the parameters, it can calculate that the initial reference quantity is Ccal2=(S3-S4) / (S3+S4), that is, by calculating the reference quantity, the influence of d on C is offset, and the reference quantity is affected by the change of S. Therefore, when the current reference amount is equal to the initial reference amount, it indicates that there is no change in the facing area between the first detection surface and the second detection surface, i.e., no relative rotation has occurred between the first detection surface and the second detection surface, and when the current reference amount is not equal to the initial reference amount, it indicates that a change has occurred in the facing area between the first detection surface and the second detection surface, i.e., relative rotation has occurred between the first detection surface and the second detection surface.

[0041] In some examples, the sensing unit may be integrated into a printed circuit board or a flexible circuit board of the sensing assembly.

[0042] In this embodiment, a first plate of the rotation detection assembly is fixed to a first detection surface of the detection target assembly, and the second and third plates are both fixed to a second detection surface parallel to the first detection surface, the first and second plates face each other at a first angle, and the first and third plates face each other at a second angle not equal to the first angle, and when the first and second detection surfaces translate in their respective planes, the facing areas between the first and second plates and the facing areas between the first and third plates do not change, and the detection units of the rotation detection assembly are electrically connected to the first, second, and third plates, respectively, to obtain a capacitance value between the first and second plates and a capacitance value between the first and third plates, and determine whether a relative rotation occurs between the first and second detection surfaces based on the capacitance values ​​obtained in the current state and the initial state. From the viewpoint that the translation on the plane on which each of the detection surfaces (the first detection surface and the second detection surface) is located does not affect the facing area between the first electrode plate and the second electrode plate and the facing area between the first electrode plate and the third electrode plate, in terms of capacitance, the capacitance value does not change. On the other hand, when a relative rotation occurs between the first detection surface and the second detection surface, the facing area between the first electrode plate and the second electrode plate and the facing area between the first electrode plate and the third electrode plate change, in terms of capacitance, the capacitance value changes. At the same time, since the two electrodes (the second electrode plate and the third electrode plate) on the second detection surface are arranged at different angles, even if the distance between the first detection surface and the second detection surface changes, it is offset during the calculation of the capacitance value. Therefore, by detecting the capacitance value, it is possible to accurately detect whether important components in the precision module are rotating, and to ensure that the precision module operates normally.

[0043] In one embodiment, the first plate, the second plate and the third plate are rectangular as shown in FIG. 2, the first plate 101, the second plate 102 and the third plate 103 are rectangular, the width of the first plate 101 is smaller than the length of the second plate 102, the width of the first plate 101 is also smaller than the length of the third plate 103, the width of the second plate 102 is smaller than the length of the first plate 101 and the width of the third plate 103 is also smaller than the length of the first plate 101. By using rectangular plates, it is ensured that the opposite part of the first plate and the second plate is a parallelogram, and the opposite part of the first plate and the third plate is a parallelogram, and the area, base, height, etc. of the parallelogram are standardized and easy to calculate, so that the accuracy of rotation detection can be further improved.

[0044] In one embodiment, the first plate, the second plate, the third plate, and the positional relationship between the first plate, the second plate, and the third plate are as shown in Fig. 3, the second plate and the third plate are the same complete plate, the first plate is provided with a first openwork rectangle, the complete plate is provided with a second openwork rectangle and a third openwork rectangle, the width of the first rectangle is smaller than the length of the second rectangle, the width of the first rectangle is also smaller than the length of the third rectangle, the width of the second rectangle is also smaller than the length of the first rectangle, and the width of the third rectangle is also smaller than the length of the first rectangle. When a relative translation and / or relative rotation occurs between the first detection surface and the second detection surface, the projection of the edge of the complete plate on the first detection surface is always within the range of the edge of the first plate, and both the first plate and the second plate shown in Fig. 3 are circular.

[0045] In some examples, the shapes of the first plate and the complete plate are not limited, and the shapes of the first plate and the complete plate may be different, and it is only necessary to ensure that when relative translation and / or relative rotation occurs between the first detection surface and the second detection surface, the projection of the edge of the complete plate on the first detection surface is always within the edge range of the first plate, or when relative translation and / or relative rotation occurs between the first detection surface and the second detection surface, the projection of the edge of the first plate on the second detection surface is always within the edge range of the complete plate.

[0046] In some examples, the first plate may be multiple, and the multiple first plates, second plates, and third plates, and the positional relationship between each of the first plates, second plates, and third plates may be as shown in FIG. 4. The multiple first plates are installed parallel to the first detection surface, and each of the second plates and each of the first plates have a facing area, and each of the third plates and each of the first plates have a facing area. By increasing the number of plates, the facing area between the plates can be increased, which means that the capacitance signal can be amplified, the change in capacitance value can be more accurately recognized, and the accuracy of rotation detection can be further improved.

[0047] In some examples, there is no limitation on the specific number of first plates.

[0048] In some embodiments, the first plate is fixed to the first detection surface, the second plate and the third plate are both fixed to the second detection surface, and the first detection surface is fixed to a plane on which it is located, and the detection unit of the rotation detection assembly is also used to determine a rotation angle corresponding to the second detection surface based on the capacitance value obtained in the current state, the width of the first plate, the width of the second plate, and the width of the third plate after a relative rotation occurs between the first detection surface and the second detection surface. After determining that the second detection surface has rotated relative to the first detection surface, the rotation detection assembly can further determine the rotation angle of the second detection surface, and provide technical support for subsequent rotation correction, attitude correction, etc.

[0049] In one example, the determination of the rotation angle corresponding to the second detection surface can be realized by the following formula, as shown in Fig. 2, if the first angle (a degree) and the second angle (b degree) are known, n degree and m degree are also known, and S3 = 4πkd'C3 / ε and S4 = 4πkd'C4 / ε can be calculated based on the capacitance value C3 = εS3 / (4πkd') between the first plate and the second plate acquired in the current state and the capacitance value C4 = εS4 / (4πkd') between the first plate and the third plate acquired in the current state. If the rotation angle is c, W1W2 / cos(-n+c) = εS3 / (4πkd') and W1W3 / cos(m+c) = εS4 / (4πkd') can be obtained based on trigonometric functions. where W1 is the width of the first plate, W2 is the width of the second plate, W3 is the width of the third plate, and c is the rotation angle corresponding to the second detection surface. By simplification, we can obtain cos(cn) / cos(c+m)=W2C2 / W3C1, and further obtain the rotation angle corresponding to the second detection surface based on the sum-to-product identities.

[0050] In one embodiment, the first plate of the rotation detection assembly is fixed to a first detection surface, the second plate and the third plate are fixed to a second detection surface, and the first detection surface is fixed to a plane on which it is located; a gyroscope is installed in the device to which the assembly to be detected belongs, and the gyroscope is used to obtain the world rotation angle of the device to which the assembly to be detected belongs; as shown in FIG. 5, the rotation detection assembly includes a first plate 101, a second plate 102, a third plate 103, a detection unit 104, a driving unit 105 and an acquisition unit 106; for the convenience of explaining the positional relationship, FIG. 5 also shows the first detection surface 201 and the second detection surface 202 used in conjunction with the rotation detection assembly, but does not show the gyroscope of the device to which the assembly to be detected belongs. A communication connection is established between the acquisition unit 106 and the gyroscope, a communication connection is established between the driving unit 105, the acquisition unit 106 and the detection unit 104, and a structural connection is established between the driving unit 105 and the second detection surface 202.

[0051] The acquisition unit 106 is used to acquire the world rotation angle of the device to which the detection target assembly belongs from the gyroscope. The driving unit 105 is used to drive the second detection surface 202 to rotate according to the world rotation angle, and further drive the second detection surface 202 to rotate relative to the first detection surface 201. After the detection unit 104 determines the rotation angle corresponding to the second detection surface 202, it is further used to judge whether the difference between the absolute value of the world rotation angle and the absolute value of the rotation angle corresponding to the second detection surface 202 is zero, and if the difference between the absolute value of the world rotation angle and the absolute value of the rotation angle corresponding to the second detection surface 202 is zero, it is used to send a stop command to the driving unit 105. After receiving the stop command, the driving unit 105 is also used to stop driving the second detection surface 202 to rotate in the reverse direction.

[0052] In one scenario, when the device to which the assembly to be detected belongs rotates, i.e. the entire device rotates in the world coordinate system, and the assembly to be detected needs to function properly, it is required that the second detection surface does not rotate relative to the world coordinate system, so the drive unit of the rotating detection assembly can rotate the second detection surface in the opposite direction so that the assembly to be detected and the device to which it belongs can function properly.

[0053] In one example, the detection unit 104 is further used for sending a continuing operation command to the driving unit 105 when the difference between the absolute value of the world rotation angle and the absolute value of the rotation angle corresponding to the second detection surface 202 is not zero, where the continuing operation command is loaded with the difference between the absolute value of the world rotation angle and the absolute value of the rotation angle corresponding to the second detection surface 202. The driving unit 105 is further used for continuing to drive to rotate the second detection surface based on the difference between the absolute value of the world rotation angle and the absolute value of the rotation angle corresponding to the second detection surface 202 after receiving the continuing operation command.

[0054] As can be understood, if the difference between the absolute value of the world rotation angle and the absolute value of the rotation angle corresponding to the second detection surface is not zero, it indicates that the drive unit is under-correcting or over-correcting, so it is necessary to continue adjusting until the detection unit detects that the difference between the absolute value of the world rotation angle and the absolute value of the rotation angle corresponding to the second detection surface becomes zero.

[0055] In one embodiment, the first plate of the rotation detection assembly is fixed to a first detection surface, the second plate and the third plate are fixed to a second detection surface, and the first detection surface is fixed to a plane on which it is located. The cross section of the rotation detection assembly includes a first plate 101, a second plate 102, a third plate 103, a detection unit 104 and a driving unit 105, as shown in FIG. 6. For convenience of explaining the positional relationship, FIG. 6 also shows a first detection surface 201 and a second detection surface 202 used in conjunction with the rotation detection assembly.

[0056] A communication connection is established between the driving unit 105 and the detection unit 104, and a structural connection is also provided between the driving unit 105 and the second detection surface 202. The driving unit 105 is used to drive the second detection surface 202 to rotate in a counter-rotating manner so as to eliminate the relative rotation occurring between the first detection surface and the second detection surface.

[0057] In actual use, the relative rotation that occurs between the first detection surface and the second detection surface is an unacceptable hand shake, so the hand shake caused by rotation can be eliminated by reversing the relative rotation between the first detection surface and the second detection surface.

[0058] In one example, the maximum rotation angle of the second detection surface is a predetermined angle for clockwise or counterclockwise rotation, and the predetermined angle is smaller than the first angle and smaller than the second angle. The driving unit specifically rotates the second detection surface clockwise at the rotation angle corresponding to the second detection surface when the rotation angle corresponding to the second detection surface is positive, and rotates the second detection surface counterclockwise at the rotation angle corresponding to the second detection surface when the rotation angle corresponding to the second detection surface is negative. By limiting the predetermined angle, the rotation direction of the second detection surface can be made clear, and the elimination of the rotation can be completed by directly rotating in the opposite direction, so that the efficiency and accuracy of the rotation detection can be further improved.

[0059] The division of steps in each method above is for the convenience of explanation, and as long as they are integrated into one step or divided into several steps in realization, and contain the same logical relationship, they are all within the scope of protection of this patent. In both the algorithm and the process, adding non-significant modifications or introducing non-significant designs, but not changing the core design of the algorithm or process, are all within the scope of protection of this patent.

[0060] Another embodiment of the present application relates to a camera module. The implementation details of the camera module of this embodiment will be described in detail below. The following content is not essential for carrying out the present invention, but is merely an implementation detail provided for ease of understanding. The camera module of this embodiment includes at least a base, a flexible circuit board, an image sensor, and a rotation detection assembly as described in the above-mentioned embodiment. The image sensor is mounted on the flexible circuit board, a first detection surface is the base of the camera module, a second detection surface is the flexible circuit board of the camera module, and a detection unit is integrated on the flexible circuit board.

[0061] As shown in Fig. 7, this camera module includes a base 301 which is a first detection surface, a flexible circuit board 302 which is a second detection surface, and an image sensor 304, and although the entire rotation detection assembly is not shown in Fig. 7, a first electrode plate 3031, a second electrode plate 3032, and a third electrode plate 3033 are shown, and the detection unit is integrated in the flexible circuit board 302. Also shown in Fig. 7 are a lens 308, a lens holder 305, a motor holder 306, a housing 307, a motor pin 309, and the like in the camera module.

[0062] In addition, each module in this embodiment is a logical module, and in actual application, one logical unit may be one physical unit, may be a part of one physical unit, and may be realized by a combination of multiple physical units. In addition, in order to highlight the inventive aspects of this application, units that are not closely related to solving the technical problem presented in this application are not introduced in this embodiment, but this does not mean that there are no other units in this embodiment.

[0063] Another embodiment of the present application relates to an electronic device including at least the camera module according to the above-mentioned embodiment.

[0064] As will be understood by those skilled in the art, the above-described embodiments are specific embodiments for implementing the present application, and various changes in form or details may be made in actual applications without departing from the spirit and scope of the present application.

Claims

1. The device includes a first plate (101), a second plate (102), a third plate (103) and a detection unit (104); The first plate (101) is fixed to a first detection surface (201) of a detection target assembly; The second electrode plate (102) and the third electrode plate (103) are both fixed to a second detection surface (202) parallel to the first detection surface (201); The first plate (101) and the second plate (102) face each other at a first angle, The first plate (101) and the third plate (103) face each other at a second angle that is not equal to the first angle; When the first detection surface (201) and the second detection surface (202) are translated on the plane in which they are located, the facing area between the first electrode plate (101) and the second electrode plate (102) and the facing area between the first electrode plate (101) and the third electrode plate (103) do not change, The detection unit (104) is electrically connected to the first electrode plate (101), the second electrode plate (102), and the third electrode plate (103), respectively, and is used to obtain a capacitance value between the first electrode plate (101) and the second electrode plate (102) and a capacitance value between the first electrode plate (101) and the third electrode plate (103), and to determine whether a relative rotation occurs between the first detection surface (201) and the second detection surface (202) based on the capacitance values ​​obtained in the current state and the initial state.

1. A rotation detection assembly comprising:

2. the first angle is an acute angle and the second angle is an obtuse angle, or the first angle is an obtuse angle and the second angle is an acute angle; 2. The rotational sensing assembly of claim 1.

3. The first electrode plate (101), the second electrode plate (102), and the third electrode plate (103) are all rectangular, The width of the first plate (101) is smaller than the length of the second plate (102); The width of the first plate (101) is also smaller than the length of the third plate (103), The width of the second plate (102) is smaller than the length of the first plate (101); The width of the third plate (103) is also smaller than the length of the third plate (103).

2. The rotational sensing assembly of claim 1.

4. The second plate (102) and the third plate (103) are identical complete plates; The first plate (101) is provided with a first openwork rectangle, and the complete plate is provided with a second openwork rectangle and a third openwork rectangle, the width of the first rectangle is smaller than the length of the second rectangle, the width of the first rectangle is also smaller than the length of the third rectangle, the width of the second rectangle is smaller than the length of the first rectangle, and the width of the third rectangle is also smaller than the length of the first rectangle; when a relative translation and / or a relative rotation occurs between the first detection surface (201) and the second detection surface (202), the projection of the edge of the complete plate on the first detection surface (201) always lies within the edge of the first plate (101), 2. The rotational sensing assembly of claim 1.

5. The first electrode plate (101) is provided in a plurality of locations, and the plurality of first electrode plates (101) are arranged parallel to the first detection surface (201). The second electrode plate (102) and each of the first electrode plates (101) have a facing area, and the third electrode plate (103) and each of the first electrode plates (101) also have a facing area.

2. The rotational sensing assembly of claim 1.

6. The first detection surface (201) is fixed to a plane on which it is located; After determining that a relative rotation occurs between the first detection surface (201) and the second detection surface (202), the detection unit (104) is also used to determine a rotation angle corresponding to the second detection surface (202) based on each capacitance value acquired in a current state, the width of the second plate (102), and the width of the third plate (103).

3. The rotational sensing assembly of claim 2.

7. The device to which the detection target assembly belongs is provided with a gyroscope for acquiring a world rotation angle of the device to which the detection target assembly belongs; The rotation detection assembly further comprises an acquisition unit (106) and a drive unit (105), a communication connection is established between the acquisition unit (106) and the gyroscope, a communication connection is established between the drive unit (105) and the acquisition unit (106) and the detection unit (104), and a structural connection is provided between the drive unit (105) and the second detection surface (202); the acquisition unit (106) is used for acquiring the world rotation angle from the gyroscope; the driving unit (105) is used to drive the second detection surface (202) to rotate based on the world rotation angle, and to further drive the second detection surface (202) to rotate relative to the first detection surface (201); After determining the rotation angle corresponding to the second detection surface (202), the detection unit (104) is further used to judge whether the difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface (202) is zero, and if the difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface (202) is zero, send a stop command to the driving unit (105); The driving unit (105) is also used to stop driving the second detection surface (202) to rotate in a reverse direction after receiving the stop command.

7. The rotational sensing assembly of claim 6.

8. The detection unit (104) is further used for sending a continuing operation command to the driving unit (105) when a difference between the absolute value of the rotation angle and an absolute value of the rotation angle corresponding to the second detection surface (202) is not zero, and the continuing operation command is loaded with the difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface (202); The driving unit (105) is further used for continuing to drive the second detection surface (202) to rotate based on a difference between the absolute value of the rotation angle and the absolute value of the rotation angle corresponding to the second detection surface (202) after receiving the continuous operation command.

8. The rotational sensing assembly of claim 7.

9. The rotational detection assembly further comprises a drive unit (105), a communication connection is established between the drive unit (105) and the detection unit (104), and a structural connection is also provided between the drive unit (105) and the second detection surface (202); The driving unit (105) is used to drive the second detection surface (202) to rotate in a reverse direction based on a rotation angle corresponding to the second detection surface (202) so as to eliminate a relative rotation occurring between the first detection surface (201) and the second detection surface (202).

7. The rotational sensing assembly of claim 6.

10. The maximum rotation angle of the second detection surface (202) is a predetermined angle that rotates clockwise or counterclockwise, and the predetermined angle is smaller than the first angle and smaller than the second angle. Specifically, when the rotation angle corresponding to the second detection surface (202) is positive, the drive unit (105) rotates the second detection surface (202) clockwise at the rotation angle corresponding to the second detection surface (202), and when the rotation angle corresponding to the second detection surface (202) is negative, the drive unit (105) rotates the second detection surface (202) counterclockwise at the rotation angle corresponding to the second detection surface (202).

10. The rotational sensing assembly of claim 9.

11. The rotation detection assembly includes at least a base (301), a flexible circuit board (302), an image sensor, and the rotation detection assembly according to any one of claims 1 to 10, wherein the image sensor is mounted on the flexible circuit board (302), the first detection surface is the base (301), the second detection surface is the flexible circuit board (302), and the detection unit is integrated on the flexible circuit board (302). A camera module comprising:

12. 12. A camera system comprising at least a camera module according to claim 11, 1. An electronic device comprising:

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