Prism motor, rotation angle detection method of prism motor, and camera device

Abstract

The embodiments of the present application relate to the technical field of electronic products, and provide a prism motor, a rotation angle detection method of a prism motor, and a camera device. The prism motor includes: a base, which includes a bottom plate; a prism carrier, which is arranged above the bottom plate, and is used to carry a prism. The prism carrier can rotate around a first rotation axis and a second rotation axis relative to the base, and the intersection of the first rotation axis and the second rotation axis is the rotation center; a first pole plate, which is located on the surface of the base, and the orthographic projection of the geometric center of the first pole plate on the bottom plate coincides with the orthographic projection of the rotation center on the bottom plate; a plurality of second pole plates arranged at intervals, and at least two second pole plates are symmetrically arranged with the geometric center of the first pole plate and the plane where the first rotation axis is located; a floating pole plate, which is located on the bottom surface of the prism carrier, and is arranged opposite to the first pole plate and opposite to the second pole plate, which is at least beneficial to improving the anti-shake accuracy of the prism motor.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electronic products, and in particular to a prism motor, a rotation angle detection method of a prism motor, and a camera device. Background Art

[0002] With the development of technology, many electronic devices today (such as tablet computers or smartphones) are equipped with lens modules and have camera or video functions. Lenses can be roughly divided into short-focal-length wide-angle lenses and long-focal-length telephoto lenses; however, placing long-focal-length lenses in optical modules will increase the thickness of electronic devices, making it difficult to meet the requirements of mobile terminal devices for thinness and lightness. In the prior art, a periscope design is usually adopted, that is, the optical path is set horizontally and a turning prism is added to rotate the optical path 90 degrees, so that the entire optical system lies flat to reduce the overall height.

[0003] The periscope lens drive device consists of two parts: the reflection module (prism motor) and the lens module (periscope motor). The reflection module reflects the imaging light 90 degrees and then injects it into the lens module, which focuses and forms the image. The anti-shake solution of the periscope module is that the reflection module and the lens module are responsible for anti-shake in two directions separately or jointly.

[0004] However, the prism motor's anti-shake has the problem of poor accuracy. Summary of the invention

[0005] The embodiments of the present application provide a prism motor, a rotation angle detection method of a prism motor, and a camera device, which are at least beneficial to improving the anti-shake accuracy of the prism motor.

[0006] According to some embodiments of the present application, on the one hand, an embodiment of the present application provides a prism motor, including: a base, the base including a bottom plate; a prism carrier, the prism carrier is arranged above the bottom plate, the prism carrier is used to carry the prism, the prism carrier can rotate around a first rotation axis and a second rotation axis relative to the base, the first rotation axis and the second rotation axis are both parallel to the surface of the bottom plate, and the intersection of the first rotation axis and the second rotation axis is the rotation center; a first pole plate, the first pole plate is located on the surface of the base, and the orthographic projection of the geometric center of the first pole plate on the bottom plate coincides with the orthographic projection of the rotation center on the bottom plate; a plurality of second pole plates arranged at intervals, the second pole plates are located on the surface of the base and are arranged at intervals from the first pole plates, and at least two second pole plates are symmetrically arranged with the geometric center of the first pole plate and the plane where the first rotation axis is located; a floating pole plate, the floating pole plate is located on the bottom surface of the prism carrier, and the floating pole plate is arranged opposite to the first pole plate and opposite to the second pole plate.

[0007] In some embodiments, at least two second electrode plates are symmetrically arranged about the plane where the geometric center of the first electrode plate and the second rotation axis are located.

[0008] In some embodiments, the first electrode plate includes: a central electrode plate and a plurality of extended electrode plates, the geometric center of the central electrode plate coincides with the orthographic projection of the rotation center on the bottom plate, the plurality of extended electrode plates are located around the central electrode plate and are centrally symmetrically arranged relative to the geometric center of the central electrode plate, and each extended electrode plate is electrically connected to the central electrode plate; along the circumferential direction of the central electrode plate, the second electrode plate is located between adjacent extended electrode plates.

[0009] In some embodiments, the first electrode plate includes a hollow portion that passes through the first electrode plate in the thickness direction of the first electrode plate, the orthographic projection of the geometric center of the hollow portion on the base surface coincides with the orthographic projection of the rotation center on the base, and the second electrode plate is located in the hollow portion.

[0010] In some embodiments, the second electrode plate is located around the first electrode plate.

[0011] In some embodiments, the orthographic projection of the first plate on the bottom plate surface is located within the orthographic projection of the floating plate on the bottom plate surface, and the orthographic projection of the second plate on the bottom plate surface is located within the orthographic projection of the floating plate on the bottom plate surface.

[0012] In some embodiments, the floating electrode plate includes a plurality of conductive plates, the plurality of conductive plates are electrically connected to each other, and the orthographic projection of each conductive plate on the surface of the bottom plate covers a first electrode plate or a second electrode plate.

[0013] In some embodiments, the initial position is that the bottom surface of the prism carrier is parallel to the base plate. Relative to the initial position, the angle at which the prism carrier rotates relative to the base about the first rotation axis is less than or equal to 5°; the angle at which the prism carrier rotates relative to the base about the second rotation axis is less than or equal to 5°.

[0014] According to some embodiments of the present application, on the other hand, the embodiments of the present application further provide a method for detecting the rotation angle of a prism motor, which is applied to the prism motor in the above-mentioned embodiments, comprising: rotating the bottom surface of the prism carrier to an initial position parallel to the bottom plate; rotating the prism carrier clockwise around a first rotation axis to a first target angle, and during the rotation process, obtaining a plurality of first capacitance values ​​between each second electrode plate and the first electrode plate at a plurality of rotation angles, and fitting a first curve graph with the rotation angle and the corresponding plurality of first capacitance values; rotating the prism carrier to the initial position; rotating the prism carrier counterclockwise around the first rotation axis to a second target angle, and during the rotation process , obtain multiple second capacitance values ​​between each second electrode plate and the first electrode plate at multiple rotation angles, and fit a second curve graph with the rotation angle and the corresponding multiple second capacitance values; combine the first curve graph and the second curve graph to obtain a first capacitance angle curve graph, the first capacitance angle curve graph is characterized by the relationship between the capacitance values ​​between each second electrode plate and the first electrode plate when the prism carrier is rotated to different angles relative to the base with the first rotation axis; obtain multiple first real-time capacitances between the first electrode plate and each second electrode plate; bring the multiple first real-time capacitances into the first capacitance angle curve graph, and obtain the rotation angle of the prism carrier with the first rotation axis relative to the base.

[0015] According to some embodiments of the present application, the embodiments of the present application further provide a camera device, including: a prism motor as in the above-mentioned embodiments; a prism, the prism is arranged on a prism carrier, the incident light direction of the prism is perpendicular to the surface of the base plate, and the reflected light direction of the prism is parallel to the first rotation axis; a lens, the focusing direction of the lens is opposite to the reflected light of the prism; a photosensitive chip, the photosensitive chip is located on the side of the lens away from the prism, and the photosensitive chip is used to receive the reflected light passing through the lens.

[0016] The technical solution provided by the embodiments of the present application has at least the following advantages:

[0017] In the prism motor provided in the embodiment of the present application, the prism carrier can rotate relative to the base around the first rotation axis or the second rotation axis, thereby driving the prism carried on the prism carrier to rotate around the first rotation axis or the second rotation axis. When the prism motor is used, if the prism carrier shakes due to the shaking of the electronic device loaded with the prism motor, the prism carrier can be driven to rotate in the opposite direction by the driving component in the prism motor to offset the displacement caused by the shaking. A first electrode plate and a plurality of second electrode plates arranged at intervals are arranged on the bottom plate of the prism motor, and a floating electrode plate is arranged on the bottom surface of the prism carrier. The first electrode plate and the second electrode plate are used to connect to the detection circuit. A group of capacitors (first capacitors) can be formed between the first electrode plate and the floating electrode plate, and a group of capacitors (second capacitors) can be formed between any second electrode plate and the floating electrode plate. Then, the capacitance value between any second electrode plate and the first electrode plate is the series capacitance value of the first capacitor and the second capacitor. The orthographic projection of the geometric center of the first electrode plate on the bottom plate coincides with the orthographic projection of the rotation center on the bottom plate, and at least two second electrode plates are symmetrically arranged with the geometric center of the first electrode plate and the plane where the first rotation axis is located. Regardless of whether the prism carrier rotates clockwise or counterclockwise relative to the base around the first rotation axis, at least two sets of capacitance values ​​correspond to each rotation angle. According to the multiple sets of capacitance values ​​corresponding to different angles, the relationship between the rotation angle of the prism carrier around the first rotation axis and the change of multiple capacitances can be obtained. Then, during the use of the prism motor, the rotation angle of the prism carrier can be inferred according to the corresponding multiple capacitance values. In this way, the position state of the prism carrier can be accurately obtained, so that the driving component can accurately drive the rotation of the prism carrier according to the corresponding position state to offset the displacement of the jitter, thereby improving the anti-shake accuracy. In addition, the floating electrode plate does not need to be connected to the detection circuit, so the instability of the detection circuit will not be caused by the jitter of the prism carrier, which is conducive to improving the accuracy of obtaining the capacitance value between the first electrode plate and the second electrode plate, thereby improving the accurate calculation of the rotation angle of the prism carrier, so as to improve the anti-shake accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the overall structure of a prism motor provided in one embodiment of the present application;

[0020] Figure 2 A schematic diagram of a cross-sectional structure of a prism motor along a first rotation axis provided in one embodiment of the present application;

[0021] Figure 3 A top view of a first electrode plate and a second electrode plate provided in one embodiment of the present application;

[0022] Figure 4 A top view of another first electrode plate and a second electrode plate provided in an embodiment of the present application;

[0023] Figure 5 A top view of another first electrode plate and a second electrode plate provided in an embodiment of the present application;

[0024] Figure 6 A top view corresponding to a first electrode plate, a second electrode plate and a floating electrode plate provided in one embodiment of the present application;

[0025] Figure 7 A top view corresponding to another first electrode plate, a second electrode plate and a floating electrode plate provided in an embodiment of the present application;

[0026] Figure 8 A schematic diagram of the position of point R in a rectangular coordinate system provided in an embodiment of the present application;

[0027] Fig. 9 A simulation curve when the prism carrier rotates around the first rotation axis;

[0028] Fig.10 is a simulation curve when the prism carrier rotates around the first rotation axis when the second rotation axis rotates ±1° relative to the base;

[0029] Fig.11 is a simulation curve when the prism carrier rotates around the first rotation axis with the second rotation axis rotating at intervals of 0.5°;

[0030] Fig.12 A schematic structural diagram of a camera device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0031] As known from the background technology, the prism motor has the problem of low anti-shake accuracy.

[0032] The prism motor usually includes a prism carrier and a base. The prism carrier is used to carry the prism. The base and the prism carrier are connected by a spring so that the prism carrier is suspended above the base. The prism motor is also provided with a first drive component and a second drive component. The first drive component can drive the prism carrier to rotate relative to the base around a first horizontal direction, and the second drive component can drive the prism carrier to rotate relative to the base around a second horizontal direction. The intersection of the first horizontal direction and the second horizontal direction is the rotation center of the prism motor. During the use of the prism motor, it is inevitable that the prism carrier cannot be aligned with the lens due to jitter caused by operational problems. The first drive component and the second drive component can offset the jitter displacement of the prism carrier relative to the base, thereby achieving anti-shake. In the related art, the emitter plate and the receiving plate are usually arranged relative to each other. The emitter plate is arranged on the base, and the receiving plate is arranged on the prism carrier. When the prism carrier rotates relative to the base, the capacitance between the emitter plate and the receiving plate changes, and the position detection of the prism carrier is achieved according to the change in capacitance. However, the rotation of the prism carrier relative to the base is not simply a change in the plate area or the plate distance. Therefore, the capacitance change between the transmitting plate and the receiving plate is not a simple linear relationship, which makes it impossible to accurately obtain the relationship between a single capacitance change and the position of the prism carrier, thereby reducing the anti-shake accuracy of the prism motor.

[0033] The embodiments of the present application provide a prism motor, a rotation angle detection method of a prism motor, and a camera device, which are at least beneficial to improving the anti-shake accuracy of the prism motor.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0037] In the description of the embodiments of the present application, when a certain component “includes” another component, unless otherwise stated, other components are not excluded and other components may be further included.

[0038] The terms used in the description of the various described embodiments herein are used only to describe specific embodiments and are not intended to be limiting. As used in the description of the various described embodiments and the appended claims, "components" are also intended to include plural forms unless the context clearly indicates otherwise.

[0039] The following will describe the various embodiments of the present application in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present application, many technical details are provided in order to enable 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 claimed in the present application can be implemented.

[0040] Figure 1 A schematic diagram of the overall structure of a prism motor provided in one embodiment of the present application; Figure 2 A schematic diagram of a cross-sectional structure of a prism motor along a first rotation axis provided in one embodiment of the present application; Figure 3 A top view of a first electrode plate and a second electrode plate provided in one embodiment of the present application; Figure 4 A top view of another first electrode plate and a second electrode plate provided in an embodiment of the present application; Figure 5 A top view of another first electrode plate and a second electrode plate provided in an embodiment of the present application.

[0041] refer to Figures 1 to 5 According to some embodiments of the present application, the present application provides a prism motor, including: Figure 1 and Figure 2, a base 100 and a prism carrier 200, the base 100 includes a bottom plate 101, the prism carrier 200 is arranged above the bottom plate 101, the prism carrier 200 is used to carry the prism 201, the prism carrier 200 can rotate relative to the base 100 around a first rotation axis X, and the prism carrier 200 can rotate relative to the base 100 around a second rotation axis Y, the first rotation axis X and the second rotation axis Y are both parallel to the surface of the bottom plate 101, and the intersection of the first rotation axis X and the second rotation axis Y is the rotation center O. The prism motor also includes: a first pole plate 301, a plurality of second pole plates 302 arranged at intervals, and a floating pole plate 303, the first pole plate 301 and the second pole plate 302 are both located on the surface of the base 100, the orthographic projection of the geometric center of the first pole plate 301 on the bottom plate 101 coincides with the orthographic projection of the rotation center O on the bottom plate 101, the second pole plate 302 is spaced apart from the first pole plate 301, refer to Figures 3 to 5 At least two second pole plates 302 are symmetrically arranged about the plane where the geometric center of the first pole plate 301 and the first rotation axis X are located; the floating pole plate 303 is located on the bottom surface of the prism carrier 200, and the floating pole plate 303 is arranged opposite to the first pole plate 301 and the second pole plate 302.

[0042] In the prism motor provided in the embodiment of the present application, the prism carrier 200 can rotate around the first rotation axis X or the second rotation axis Y relative to the base 100, thereby driving the prism 201 carried on the prism carrier 200 to rotate around the first rotation axis X or the second rotation axis Y. When the prism motor is in use, if the prism carrier 200 shakes due to the shaking of the electronic device equipped with the prism motor, the driving component in the prism motor can drive the prism carrier 200 to rotate in the opposite direction to offset the displacement caused by the shaking. A first electrode plate 301 and a plurality of second electrode plates 302 arranged at intervals are arranged on the bottom plate 101 of the prism motor, and a floating electrode plate 303 is arranged on the bottom surface of the prism carrier 200. The first electrode plate 301 and the second electrode plate 302 are used to connect to the detection circuit. A group of capacitors (first capacitors) can be formed between the first electrode plate 301 and the floating electrode plate 303, and a group of capacitors (second capacitors) can be formed between any second electrode plate 302 and the floating electrode plate 303. Then, the capacitance value between any second electrode plate and the first electrode plate is the series capacitance value of the first capacitor and the second capacitor. Among them, the orthographic projection of the geometric center of the first electrode plate 301 on the base plate 101 coincides with the orthographic projection of the rotation center O on the base plate 101, and at least two second electrode plates 302 are symmetrically arranged with the geometric center of the first electrode plate 301 and the plane where the first rotation axis X is located. Regardless of whether the prism carrier 200 rotates clockwise or counterclockwise around the first rotation axis X relative to the base 100, at least two sets of capacitance values ​​correspond to each rotation angle. According to the corresponding multiple sets of capacitance values ​​at different angles, the relationship between the rotation angle of the prism carrier 200 around the first rotation axis X and the change of multiple capacitances can be obtained. Then, during the use of the prism motor, the rotation angle of the prism carrier 200 can be inferred based on the corresponding multiple capacitance values. In this way, the position state of the prism carrier 200 can be accurately obtained, so that the driving component can accurately drive the rotation of the prism carrier 200 according to the corresponding position state to offset the displacement of the jitter, thereby improving the anti-shake accuracy. In addition, the floating electrode 303 does not need to be connected to the detection circuit, so the jitter of the prism carrier 200 will not cause instability in the detection circuit, which is beneficial to improving the accuracy of obtaining the capacitance value between the first electrode 301 and the second electrode 302, and further improving the accurate calculation of the rotation angle of the prism carrier 200, so as to improve the anti-shake accuracy.

[0043] In this embodiment, the first rotation axis X is perpendicular to the second rotation axis Y, that is, the angle between the first rotation axis X and the second rotation axis Y is 90°. In some embodiments, the angle between the first rotation axis and the second rotation axis may be 30°, 45° or 60°.

[0044] In some embodiments, reference Figure 2 The base 100 further includes a side plate 102, which is disposed perpendicularly to the bottom plate 101, and the first rotation axis X is perpendicular to the surface of the side plate 102. Figure 1 and Figure 2 The light path direction L of the prism 201 is parallel to the Z-axis direction. After being reflected by the prism 201, the light path direction L is refracted to be parallel to the first rotation axis X.

[0045] In some embodiments, a coil assembly may be provided on the side panel, and a magnet assembly may be provided on the surface of the prism carrier facing the side panel. The magnet assembly and the coil assembly constitute a driving assembly. When the coil assembly is energized, a magnetic field is generated, and an interaction force is generated between the magnetic field and the magnetic field of the magnet assembly to cause the prism carrier to rotate.

[0046] Combined with reference Figures 1 to 5 In some embodiments, at least two second plates 302 are symmetrically arranged with the geometric center of the first plate 301 and the plane where the second rotation axis Y is located. In this way, one second plate 302 and the first plate 301 form a group of capacitors (third capacitors), and the other second plate 302 and the first plate 301 form a group of capacitors (fourth capacitors). Regardless of whether the prism carrier 200 rotates clockwise or counterclockwise around the second rotation axis Y relative to the base 100, at least two groups of capacitance values ​​correspond to each rotation angle. According to the corresponding multiple capacitance values ​​at different angles, the relationship between the rotation angle of the prism carrier 200 around the second rotation axis Y and the change of multiple capacitances can be obtained. Then, during the use of the prism motor, the rotation angle of the prism carrier 200 can be inferred according to the corresponding multiple capacitance values. In this way, the position state of the prism carrier 200 can be accurately obtained, so that the driving component can accurately drive the rotation of the prism carrier 200 according to the corresponding position state to offset the displacement of the shake, thereby improving the anti-shake accuracy. By combining the multiple capacitance change curves corresponding to when the prism carrier 200 rotates around the first rotation axis X to different angles and the multiple capacitance change curves corresponding to when the prism carrier 200 rotates around the second rotation axis Y to different angles, the real-time position state of the prism carrier 200 in spatial rotation can be obtained, thereby realizing dual-axis high-precision anti-shake of the prism motor.

[0047] Combined with reference Figures 1 to 3 In some embodiments, the first electrode plate 301 includes: a central electrode plate 311 and a plurality of extended electrode plates 321, the geometric center of the central electrode plate 311 coincides with the orthographic projection of the rotation center O on the bottom plate 101, the plurality of extended electrode plates 321 are located around the central electrode plate 311 and are centrally symmetrically arranged relative to the geometric center of the central electrode plate 311, and each extended electrode plate 321 is electrically connected to the central electrode plate 311; along the circumferential direction of the central electrode plate 311, the second electrode plate 302 is located between adjacent extended electrode plates 321.

[0048] In some embodiments, the central plate 311 and the extended plate 321 may be an integrally formed structure; or, in some embodiments, the central plate 311 and the extended plate 321 may be independent of each other and connected via electrical connection lines.

[0049] Combined with reference Figure 1 to Figure 2 as well as Figure 4 In some embodiments, the first electrode plate 301 includes a hollow portion 331 that penetrates the first electrode plate 301 in the thickness direction of the first electrode plate 301, the orthographic projection of the geometric center of the hollow portion 331 on the surface of the base 100 coincides with the orthographic projection of the rotation center O on the base 100, and the second electrode plate 302 is located in the hollow portion 331.

[0050] Combined with reference Figure 1 to Figure 2 as well as Figure 5 (a) or Figure 5 In (b), in some embodiments, the second electrode plate 302 is located around the first electrode plate 301 .

[0051] In some embodiments, in conjunction with reference Figures 1 to 5 , the second electrode plate 302 is centrally symmetrically arranged relative to the geometric center of the first electrode plate 301. In this way, the change trend of the capacitance value of the first capacitor corresponding to the rotation of the prism carrier 200 clockwise around the first rotation axis X relative to the base 100 is the same as the change trend of the capacitance value of the second capacitor when the prism carrier 200 rotates counterclockwise around the first rotation axis X relative to the base 100; the change trend of the capacitance value of the second capacitor corresponding to the rotation of the prism carrier 200 clockwise around the first rotation axis X relative to the base 100 is the same as the change trend of the capacitance value of the first capacitor when the prism carrier 200 rotates counterclockwise around the first rotation axis X relative to the base 100. Similarly, the change trend of the capacitance value of the corresponding third capacitor when the prism carrier 200 rotates clockwise around the second rotation axis Y relative to the base 100 is the same as the change trend of the capacitance value of the fourth capacitor when the prism carrier 200 rotates counterclockwise around the second rotation axis Y relative to the base 100; the change trend of the capacitance value of the corresponding fourth capacitor when the prism carrier 200 rotates clockwise around the second rotation axis Y relative to the base 100 is the same as the change trend of the capacitance value of the third capacitor when the prism carrier 200 rotates counterclockwise around the second rotation axis Y relative to the base 100. In this way, it is easy to calculate the corresponding relationship between the position state of the prism carrier 200 and multiple sets of capacitance values.

[0052] Figure 6 A top view corresponding to a first electrode plate, a second electrode plate and a floating electrode plate provided in one embodiment of the present application; Figure 7 This is a top view of another first electrode plate, a second electrode plate and a floating electrode plate provided in an embodiment of the present application. Figure 6 and Figure 7The middle floating plate 303 is in a transparent state.

[0053] Combined with reference Figure 1 , Figure 2 , Figure 6 and Figure 7 In some embodiments, during the rotation of the prism carrier 300 relative to the base 100 around the first rotation axis X or the second rotation axis Y, the orthographic projection of the first electrode plate 301 on the surface of the bottom plate 101 is always located within the orthographic projection of the floating electrode plate 303 on the surface of the bottom plate 101, and the orthographic projection of the second electrode plate 302 on the surface of the bottom plate 101 is always located within the orthographic projection of the floating electrode plate 303 on the surface of the bottom plate 101. In this way, during the rotation of the floating electrode plate 303 driven by the rotation of the prism carrier 200, the effective area of ​​the capacitor formed between the first electrode plate 301 and the floating electrode plate 303 is always the area of ​​the first electrode plate 301, and the effective area of ​​the capacitor formed between the second electrode plate 302 and the floating electrode plate 303 is always the area of ​​the second electrode plate 302, so as to avoid the situation where the change of the capacitance fluctuates due to a sudden change in the effective area between the floating electrode plate 303 and the first electrode plate 301 or the second electrode plate 302. The effective area refers to the actual area between the two electrodes that can be used for charge storage.

[0054] refer to Figure 6 In some embodiments, the floating plate 303 may be a full-surface structure.

[0055] Combined with reference Figure 2 and Figure 7 In some embodiments, the floating plate 303 may include a plurality of conductive plates 313, the plurality of conductive plates 313 are electrically connected to each other, and the orthographic projection of each conductive plate 313 on the surface of the bottom plate 101 covers a first plate 301 or a second plate 302. In this way, the shape of the floating plate 303 can be designed according to the position and shape of each first plate 301 and second plate 302.

[0056] In some embodiments, the plurality of conductive plates 313 may be in electrical contact with each other, that is, the plurality of conductive plates 313 are an integrally formed structure; or, in some embodiments, the plurality of conductive plates 313 may be independent of each other and connected by electrical connecting lines.

[0057] In some embodiments, the bottom surface of the prism carrier 200 is parallel to the bottom plate 101 as the initial position. Relative to the initial position, the angle of rotation of the prism carrier 200 relative to the base 100 about the first rotation axis X is less than or equal to 5°, such as 1°, 1.4°, 2°, 2.5°, 3°, 3.3°, 4°, 4.8° or 5°; the angle of rotation of the prism carrier 200 relative to the base 100 about the second rotation axis Y is less than or equal to 5°, such as 1°, 1.4°, 2°, 2.5°, 3°, 3.3°, 4°, 4.8° or 5°. It should be noted that the rotation of the prism carrier 200 relative to the base 100 about the first rotation axis X can be clockwise or counterclockwise; the direction of rotation of the prism carrier 200 relative to the base 100 about the second rotation axis Y can be clockwise or counterclockwise.

[0058] In the prism motor provided in the embodiment of the present application, the prism carrier 200 can rotate around the first rotation axis X or the second rotation axis Y relative to the base 100, thereby driving the prism 201 carried on the prism carrier 200 to rotate around the first rotation axis X or the second rotation axis Y. When the prism motor is in use, if the prism carrier 200 shakes due to the shaking of the electronic device equipped with the prism motor, the driving component in the prism motor can drive the prism carrier 200 to rotate in the opposite direction to offset the displacement caused by the shaking. A first electrode plate 301 and a plurality of second electrode plates 302 arranged at intervals are arranged on the bottom plate 101 of the prism motor, and a floating electrode plate 303 is arranged on the bottom surface of the prism carrier 200. The first electrode plate 301 and the second electrode plate 302 are used to connect to the detection circuit. A group of capacitors (first capacitors) can be formed between the first electrode plate 301 and the floating electrode plate 303, and a group of capacitors (second capacitors) can be formed between any second electrode plate 302 and the floating electrode plate 303. Then, the capacitance value between any second electrode plate and the first electrode plate is the series capacitance value of the first capacitor and the second capacitor. Among them, the orthographic projection of the geometric center of the first electrode plate 301 on the base plate 101 coincides with the orthographic projection of the rotation center O on the base plate 101, and at least two second electrode plates 302 are symmetrically arranged with the geometric center of the first electrode plate 301 and the plane where the first rotation axis X is located. Regardless of whether the prism carrier 200 rotates clockwise or counterclockwise around the first rotation axis X relative to the base 100, at least two sets of capacitance values ​​correspond to each rotation angle. According to the corresponding multiple sets of capacitance values ​​at different angles, the relationship between the rotation angle of the prism carrier 200 around the first rotation axis X and the change of multiple capacitances can be obtained. Then, during the use of the prism motor, the rotation angle of the prism carrier 200 can be inferred based on the corresponding multiple capacitance values. In this way, the position state of the prism carrier 200 can be accurately obtained, so that the driving component can accurately drive the rotation of the prism carrier 200 according to the corresponding position state to offset the displacement of the jitter, thereby improving the anti-shake accuracy. In addition, the floating electrode 303 does not need to be connected to the detection circuit, so the jitter of the prism carrier 200 will not cause instability in the detection circuit, which is beneficial to improving the accuracy of obtaining the capacitance value between the first electrode 301 and the second electrode 302, and further improving the accurate calculation of the rotation angle of the prism carrier 200, so as to improve the anti-shake accuracy.

[0059] Correspondingly, another embodiment of the present application also provides a rotation angle detection method of a prism motor, which is applied to the prism motor in the above embodiment to improve the anti-shake accuracy of the prism motor. For the parts that are the same or corresponding to the previous embodiment, please refer to the corresponding description of the above embodiment, and will not be described in detail below.

[0060] The rotation angle detection method of the prism motor includes: rotating the bottom surface of the prism carrier to an initial position parallel to the bottom plate; rotating the prism carrier clockwise to a first target angle with a first rotation axis, and during the rotation process, obtaining multiple first capacitance values ​​between each second electrode plate and the first electrode plate at multiple rotation angles, and fitting a first curve graph with the rotation angle and the corresponding multiple first capacitance values; rotating the prism carrier to the initial position; rotating the prism carrier counterclockwise to a second target angle with a first rotation axis, and during the rotation process, obtaining multiple second capacitance values ​​between each second electrode plate and the first electrode plate at multiple rotation angles, and fitting a second curve graph with the rotation angle and the corresponding multiple second capacitance values; combining the first curve graph and the second curve graph to obtain a first capacitance angle curve graph, the first capacitance angle curve graph being characterized by the relationship between the capacitance values ​​between each second electrode plate and the first electrode plate when the prism carrier is rotated to different angles relative to the base with the first rotation axis; obtaining multiple first real-time capacitances between the first electrode plate and each second electrode plate; bringing the multiple first real-time capacitances into the first capacitance angle curve graph to obtain the rotation angle of the prism carrier relative to the base with the first rotation axis.

[0061] In some embodiments, when there are at least two second pole plates in the prism motor, which are symmetrically arranged with the geometric center of the first pole plate and the plane where the second rotation axis is located, the rotation angle detection method of the prism motor also includes: before rotating the prism carrier clockwise to the first target angle with the first rotation axis, first rotating the prism carrier to a preset angle with the second rotation axis, and when the preset angle remains unchanged, rotating the prism carrier clockwise to the first target angle with the first rotation axis, and during the rotation process, obtaining multiple third capacitance values ​​between each second pole plate and the first pole plate at multiple rotation angles, and fitting a third curve graph with the rotation angle and the corresponding multiple third capacitance values; after rotating the prism carrier to the initial position, before rotating the prism carrier counterclockwise to the second target angle with the first rotation axis, first rotating the prism carrier to a preset angle with the second rotation axis, and when the preset angle remains unchanged, The prism carrier rotates counterclockwise to a second target angle about the first rotation axis, and during the rotation process, a plurality of fourth capacitance values ​​between each second electrode plate and the first electrode plate at a plurality of rotation angles are obtained, and a fourth curve graph is fitted with the rotation angle and the corresponding plurality of fourth capacitance values; the second capacitance angle curve graph is obtained by combining the third curve graph and the fourth curve graph, and the second capacitance angle curve graph is characterized by the relationship between the capacitance values ​​between each second electrode plate and the first electrode plate corresponding to the case where the prism carrier rotates about a preset angle about the second rotation axis relative to the base, and when the prism carrier rotates about a first rotation axis relative to the base to different angles; a plurality of second real-time capacitances are obtained between the first electrode plate and each second electrode plate; the plurality of second real-time capacitances are brought into the first capacitance angle curve and the second capacitance angle curve graph, and the rotation angles of the prism carrier about the first rotation axis and the second rotation axis relative to the base are obtained.

[0062] Figure 8 A schematic diagram of the position of point R in a rectangular coordinate system provided in one embodiment of the present application.

[0063] The first rotation axis X, the second rotation axis Y and the Z axis are used as a rectangular coordinate system. At the initial position, the intersection of the floating plate and the Z axis is recorded as point R. Assuming that the coordinates of any point on the floating plate are (a, b, c), after the floating plate is driven to any angle by the rotation of the prism carrier, the radius d between the point on the floating plate and the rotation center O remains unchanged. Since the coordinate position of point R in space can be calculated by the following formula: (1) a^2+b^2+c^2=d^2; (2) a / c=tan ; b / c=tan . Assume that the coordinates of point R are R (a', b', c'), and after substituting the coordinates of point R into the above formula, the surface space equation of the floating plate in the rectangular coordinate system can be calculated: a·a'+b·b'+c·c'=a^2+b^2+c^2. In this way, the distance from any point on the first plate and the second plate to the positive projection point of the floating plate along the Z axis can be obtained. Knowing the shapes and corresponding coordinates of the first plate and the second plate, the capacitance calculation formula can be obtained as: Wherein, A represents a constant, f(a, b) represents the shape equation corresponding to the second electrode plate, and gap represents the distance between the floating electrode plate and the second electrode plate in the initial state.

[0064] by Figure 3 The first plate and the second plate shown are simulated and calculated. Fig. 9 A simulation curve when the prism carrier rotates around the first rotation axis; Fig.10 is a simulation curve when the prism carrier rotates around the first rotation axis when the second rotation axis rotates ±1° relative to the base; Fig.11 is a simulation curve when the prism carrier rotates around the first rotation axis at intervals of 0.5° with the second rotation axis. Figures 9 to 11 The horizontal axis represents different angles of rotation of the prism carrier around the first rotation axis, and the vertical axis represents the capacitance value between a second electrode plate and the first electrode plate at the corresponding rotation angle.

[0065] according to Fig. 9 It can be seen that the capacitance value between the two second plates symmetrical about the first rotation axis and the geometric center of the first plate and the first plate changes significantly, and the capacitance value between the two second plates arranged on both sides of the first plate and the first plate changes very little. By processing the two groups of signals separately, the corresponding relationship between the angle of rotation of the prism carrier relative to the base about the first rotation axis and the capacitance values ​​between different second plates and the first plate can be obtained.

[0066] according to Fig.10It can be seen that the capacitance value between the second electrode plate and the first electrode plate has a good linear relationship with the change of the rotation angle, and since the first electrode plate and the second electrode plate are both centrally symmetrically distributed with respect to the geometric center of the first electrode plate, the simulation curve when the second rotation axis rotates around the first rotation axis when the second rotation axis rotates ±1° relative to the base is the same as the simulation curve when the first rotation axis rotates around the second rotation axis when the first rotation axis rotates ±1° relative to the base.

[0067] according to Fig.11 It can be seen that when the prism carrier is rotated to different angles with the second rotation axis, the rotation angle of the prism carrier when it is rotated with the first rotation axis has a high degree of overlap with the corresponding relationship between the capacitance values ​​of different second electrodes and the first electrode. The decoupling process can accurately obtain the rotation angle of the prism carrier relative to the base around the first rotation axis and the rotation angle of the second rotation axis, which is conducive to forming a closed-loop control system, accurately controlling the spatial position of the prism, and improving the anti-shake performance of the prism motor.

[0068] Correspondingly, another embodiment of the present application further provides a camera device, including: a prism motor as in the above embodiment, which can accurately obtain the position state of the prism carrier, so that the driving component can accurately drive the rotation of the prism carrier according to the corresponding position state to offset the displacement of the shaking, thereby improving the anti-shake accuracy. For the parts that are the same or corresponding to the previous embodiment, refer to the corresponding description of the previous embodiment, and will not be described in detail below.

[0069] Fig.12 The following is a schematic diagram of the structure of a camera device provided in one embodiment of the present application. Fig.12 Only the reflective surface 211 of the prism 201 is shown.

[0070] Combined with reference Figure 1 , Figure 2 and Fig.12 The camera device includes: a prism motor as in the above-mentioned embodiment; a prism 201, the prism 201 is arranged on the prism carrier 200, the incident light direction of the prism 201 is perpendicular to the surface of the base plate 101, and the reflected light direction of the prism 201 is parallel to the first rotation axis X; a lens 401, the focusing direction of the lens 401 is oppositely coincident with the reflected light of the prism 201; a photosensitive chip 402, the photosensitive chip 402 is located on the side of the lens 401 away from the prism 201, and the photosensitive chip 402 is used to receive the reflected light passing through the lens 401.

[0071] In some embodiments, the camera assembly may further include a light-transmitting sheet 403 , and the incident light passes through the light-transmitting sheet 403 and is irradiated onto the prism 201 .

[0072] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present application, and in practical applications, various changes may be made to the embodiments in form and detail without departing from the spirit and scope of the present application. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application, and therefore the scope of protection of the present application shall be subject to the scope defined in the claims.

Claims

1. A prism motor, characterized in that: include: A base, the base comprising a bottom plate; A prism carrier, the prism carrier is arranged above the bottom plate, the prism carrier is used to carry the prism, the prism carrier can rotate relative to the base around a first rotation axis and a second rotation axis, the first rotation axis and the second rotation axis are both parallel to the surface of the bottom plate, and the intersection of the first rotation axis and the second rotation axis is the rotation center; A first electrode plate, the first electrode plate is located on the surface of the base, and the orthographic projection of the geometric center of the first electrode plate on the base plate coincides with the orthographic projection of the rotation center on the base plate; A plurality of second electrode plates arranged at intervals, the second electrode plates are located on the surface of the base and are arranged at intervals from the first electrode plate, and at least two of the second electrode plates are arranged symmetrically about the plane where the geometric center of the first electrode plate and the first rotation axis are located; A floating electrode plate, the floating electrode plate is located on the bottom surface of the prism carrier, and the floating electrode plate is arranged opposite to the first electrode plate and the second electrode plate; Among them, the first electrode plate and the second electrode plate are used to connect to the detection circuit, a first capacitor is formed between the first electrode plate and the floating electrode plate, a second capacitor can be formed between any of the second electrode plates and the floating electrode plate, and the capacitance value between any of the second electrode plates and the first electrode plate is the series capacitance value of the first capacitor and the second capacitor.

2. The prism motor according to claim 1, characterized in that: At least two of the second pole plates are symmetrically arranged about the plane where the geometric center of the first pole plate and the second rotation axis are located.

3. The prism motor according to claim 1, characterized in that: The first electrode plate includes: a central electrode plate and a plurality of extended electrode plates, the geometric center of the central electrode plate coincides with the orthographic projection of the rotation center on the base plate, the plurality of extended electrode plates are located around the central electrode plate and are centrally symmetrically arranged relative to the geometric center of the central electrode plate, and each of the extended electrode plates is electrically connected to the central electrode plate; along the circumferential direction of the central electrode plate, the second electrode plate is located between adjacent extended electrode plates.

4. The prism motor according to claim 1, characterized in that: The first electrode plate includes a hollow portion that penetrates the first electrode plate in the thickness direction of the first electrode plate, the orthographic projection of the geometric center of the hollow portion on the base surface coincides with the orthographic projection of the rotation center on the base, and the second electrode plate is located in the hollow portion.

5. The prism motor according to claim 1, characterized in that: The second electrode plate is located around the first electrode plate.

6. The prism motor according to claim 1, characterized in that: The orthographic projection of the first electrode plate on the bottom plate surface is located within the orthographic projection of the floating electrode plate on the bottom plate surface, and the orthographic projection of the second electrode plate on the bottom plate surface is located within the orthographic projection of the floating electrode plate on the bottom plate surface.

7. The prism motor according to claim 1, characterized in that: The floating electrode plate includes a plurality of conductive plates, the plurality of conductive plates are electrically connected to each other, and the orthographic projection of each conductive plate on the surface of the bottom plate covers one of the first electrode plate or one of the second electrode plate.

8. The prism motor according to claim 1, characterized in that: The bottom surface of the prism carrier is parallel to the bottom plate as an initial position. Relative to the initial position, the angle at which the prism carrier rotates relative to the base about the first rotation axis is less than or equal to 5°; the angle at which the prism carrier rotates relative to the base about the second rotation axis is less than or equal to 5°.

9. A method for detecting the rotation angle of a prism motor, applied to the prism motor as claimed in any one of claims 1 to 8, characterized in that: include: Rotating the bottom surface of the prism carrier to an initial position parallel to the bottom plate; Rotate the prism carrier clockwise about the first rotation axis to a first target angle, and during the rotation process, obtain a plurality of first capacitance values ​​between each of the second electrode plate and the first electrode plate at a plurality of rotation angles, and fit a first curve graph with the rotation angle and the corresponding plurality of first capacitance values; Rotating the prism carrier to the initial position; Rotate the prism carrier counterclockwise about the first rotation axis to a second target angle, and during the rotation process, obtain a plurality of second capacitance values ​​between each of the second electrode plates and the first electrode plate at a plurality of rotation angles, and fit a second curve graph with the rotation angle and the corresponding plurality of second capacitance values; Combining the first curve graph and the second curve graph, obtaining a first capacitance angle curve graph, wherein the first capacitance angle curve graph represents the relationship between the capacitance values ​​of each of the second electrode plates and the first electrode plate when the prism carrier rotates to different angles relative to the base about the first rotation axis; Acquire a plurality of first real-time capacitances between the first electrode plate and each of the second electrode plates; The plurality of first real-time capacitors are brought into the first capacitance angle curve diagram to obtain the rotation angle of the prism carrier relative to the base about the first rotation axis.

10. A camera device, characterized in that: include: The prism motor as claimed in any one of claims 1 to 8; A prism, wherein the prism is disposed on the prism carrier, the incident light direction of the prism is perpendicular to the surface of the bottom plate, and the reflected light direction of the prism is parallel to the first rotation axis; A lens, wherein the focusing direction of the lens coincides with the reflected light of the prism in the opposite direction; A photosensitive chip is located on a side of the lens away from the prism, and is used to receive reflected light passing through the lens.

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