Prism motor, camera module, and camera device
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2026-08-13
Smart Images
Figure CN2025105530_13082026_PF_FP_ABST
Abstract
Description
Prism motor, camera module and camera equipment Cross-referencing
[0001] This disclosure claims priority to Chinese patent application No. 2025201895351, filed on February 6, 2025, entitled "Prism Motor, Camera Module and Camera Equipment", which is incorporated herein by reference in its entirety. Technical Field
[0002] This disclosure relates to the field of camera technology, and in particular to a prism motor, camera module, and camera device. Background Technology
[0003] Currently, periscope camera modules typically use a prism mounted on a prism motor to refract incident light. By folding the incident light, the focal length of the camera module is extended, thereby enhancing its zoom capability. When using the camera module for image acquisition, the propagation angle of the incident light can be changed by rotating the prism carrier in the prism motor, thus altering the imaging effect of the camera module. The rotation angle of the prism carrier is usually detected by a built-in Hall sensor.
[0004] However, Hall effect sensors require the use of magnets to measure angles. Integrating the Hall sensor and magnets inside the prism motor occupies a significant amount of internal space, resulting in a large prism motor. Furthermore, Hall sensors are susceptible to external environmental influences such as magnetic fields, leading to inaccurate detection of the prism carrier's rotation angle and consequently lower reliability of the prism motor. Therefore, the size and reliability of prism motors in related technologies need to be reduced. Summary of the Invention
[0005] This disclosure provides a prism motor, a camera module, and a camera device, which can at least reduce the size of the prism motor and improve its reliability.
[0006] According to some embodiments of this disclosure, an embodiment of this disclosure provides a prism motor, including: a base; a prism carrier rotatably disposed on the base; a first pole plate and a second pole plate, the first pole plate and the second pole plate being disposed opposite to each other on the base; a third pole plate, the third pole plate being disposed on the base, and the plane of the first pole plate being perpendicular to the plane of the third pole plate; a first floating pole plate, the first floating pole plate being disposed on the prism carrier and being disposed opposite to the first pole plate, and when the prism carrier rotates around a first rotation axis and / or a second rotation axis, one of the facing area and the distance between the first floating pole plate and the first pole plate increases and the other decreases; a second floating pole plate, the second floating pole plate being disposed on the prism carrier and being disposed opposite to the second pole plate, and when the prism carrier rotates around the first rotation axis, the facing area between the second floating pole plate and the second pole plate... One of the area and the distance increases, and the other decreases; a third floating electrode plate is disposed on the prism carrier and is disposed opposite to the third electrode plate. When the prism carrier rotates around the second rotation axis, one of the facing area and the distance between the third floating electrode plate and the third electrode plate increases, and the other decreases; wherein, the first floating electrode plate is electrically connected to the second floating electrode plate and the third floating electrode plate, the first electrode plate and the second electrode plate form a first capacitance signal, the first electrode plate and the third electrode plate form a second capacitance signal, the first rotation axis is perpendicular to the second rotation axis, and a processing unit is located on the base. The first electrode plate, the second electrode plate and the third electrode plate are all connected to the processing unit. The processing unit determines the rotation angle of the prism carrier based on the changes in the first capacitance signal and the second capacitance signal when the prism carrier rotates.
[0007] In some embodiments, there are two second floating pole plates, two second pole plates, two third floating pole plates, and two third pole plates arranged parallel to the first rotation axis; wherein, one second floating pole plate is arranged opposite to one second pole plate, another second floating pole plate is arranged opposite to another second pole plate, one third floating pole plate is arranged opposite to one third pole plate, and another third floating pole plate is arranged opposite to another third pole plate.
[0008] In some embodiments, the prism motor further includes: a fourth electrode plate located on the base and on the same surface as the second electrode plate on the base, the fourth electrode plate being connected to the processing unit; and a fourth floating electrode plate located on the prism carrier and in the same plane as the second floating electrode plate, the fourth floating electrode plate being disposed opposite to the second electrode plate. When the prism carrier rotates around the third rotation axis, one of the facing area and distance between the fourth floating electrode plate and the second electrode plate increases, and the other decreases, and one of the facing area and distance between the first floating electrode plate and the first electrode plate increases, and the other decreases; wherein the third rotation axis is perpendicular to the first rotation axis and perpendicular to the second rotation axis, the fourth electrode plate and the first electrode plate form a third capacitance signal, and the processing unit determines the rotation angle of the prism carrier based on the changes in the first capacitance signal, the second capacitance signal, and the third capacitance signal.
[0009] In some embodiments, the prism motor further includes: a fifth electrode plate located on the base and on the same surface as the second electrode plate on the base, the fifth electrode plate being connected to the processing unit; and a fifth floating electrode plate located on the prism carrier and in the same plane as the second floating electrode plate, the fifth floating electrode plate being disposed opposite to the second electrode plate. When the prism carrier rotates around the first rotation axis and / or the third rotation axis, one of the facing area and the distance between the fifth floating electrode plate and the second electrode plate increases, while the other decreases; wherein the fifth electrode plate and the first electrode plate form a fourth capacitance signal, and the processing unit determines the rotation angle of the prism carrier based on the changes in the first capacitance signal, the second capacitance signal, the third capacitance signal, and the fourth capacitance signal.
[0010] In some embodiments, in the direction parallel to the second rotation axis, the cross-sections of the third pole plate and the third floating pole plate are both rectangular, the long side of the third pole plate is greater than the long side of the third floating pole plate, and the projections of the third pole plate and the third floating pole plate onto the plane containing the second rotation axis and the third rotation axis satisfy the following: the distance between the short side of the third pole plate and the third rotation axis is greater than the distance between the short side of the third floating pole plate and the third rotation axis; in the direction parallel to the first rotation axis, the cross-sections of the second floating pole plate, the fourth floating pole plate, the fifth floating pole plate, the second pole plate, the fourth pole plate, and the fifth pole plate are rectangles with the same area.
[0011] In some embodiments, two second floating electrode plates are symmetrically arranged about the third rotation axis, one second floating electrode plate and the fourth floating electrode plate are symmetrically arranged about the first rotation axis, and the other second floating electrode plate and the fifth floating electrode plate are symmetrically arranged about the first rotation axis.
[0012] In some embodiments, the projections of the third electrode plate and the third floating electrode plate onto the plane containing the second rotation axis and the third rotation axis satisfy the following: the maximum distance between the third floating electrode plate and the second rotation axis is greater than the maximum distance between the third electrode plate and the second rotation axis, and the minimum distance between the third floating electrode plate and the second rotation axis is greater than the minimum distance between the third electrode plate and the second rotation axis; the projections of the second electrode plate and the second floating electrode plate onto the plane containing the first rotation axis and the third rotation axis satisfy the following: the maximum distance between the second floating electrode plate and the first rotation axis is greater than the maximum distance between the second electrode plate and the first rotation axis, and the minimum distance between the second floating electrode plate and the first rotation axis is greater than the minimum distance between the second electrode plate and the first rotation axis; the maximum distance between the second floating electrode plate and the third rotation axis is greater than the maximum distance between the second electrode plate and the third rotation axis, and the minimum distance between the second floating electrode plate and the third rotation axis is greater than the minimum distance between the second electrode plate and the third rotation axis.
[0013] In some embodiments, on the surface of the base perpendicular to the second rotation axis, the orthographic projection of the first floating electrode plate is located within the orthographic projection of the first electrode plate.
[0014] According to some embodiments of this disclosure, another aspect of this disclosure provides a camera module, including a prism motor as described in any of the above embodiments; and a prism disposed on a prism carrier.
[0015] According to some embodiments of this disclosure, another aspect of this disclosure provides a camera device, including the prism motor described in any of the above embodiments, or including the camera module described in the above embodiments.
[0016] The technical solutions provided in this disclosure have at least the following advantages:
[0017] The prism motor provided in this embodiment includes: a base; a prism carrier rotatably mounted on the base; a first pole plate and a second pole plate, which are disposed opposite to each other on the base; a third pole plate, which is mounted on the base, and the plane of the first pole plate is perpendicular to the plane of the third pole plate; a first floating pole plate, which is mounted on the prism carrier and is disposed opposite to the first pole plate, and when the prism carrier rotates around a first rotation axis and / or a second rotation axis, one of the facing areas and the distance between the first floating pole plate and the first pole plate increases, while the other decreases; and a second floating pole plate, which is mounted on the prism carrier and is disposed opposite to the second pole plate, and when the prism carrier rotates around a first rotation axis, the facing area and the distance between the second floating pole plate and the first pole plate increase. One of the facing areas and the distance between the two electrodes increases, while the other decreases. A third floating electrode is mounted on the prism carrier and positioned opposite to the third electrode. When the prism carrier rotates around the second rotation axis, one of the facing areas and the distance between the third floating electrode and the third electrode increases, while the other decreases. The first, second, and third floating electrodes are electrically connected. The first and second electrodes form a first capacitance signal, and the first and third electrodes form a second capacitance signal. The first and second rotation axes are perpendicular. A processing unit is located on the base and is connected to the first, second, and third electrodes. The processing unit determines the rotation angle of the prism carrier based on the changes in the first and second capacitance signals as the prism carrier rotates.
[0018] In the prism motor, as the prism carrier rotates around the first rotation axis, the first capacitance signal formed by the first and second floating plates is altered due to the skip bridging characteristic of the capacitance signal between the first and second floating plates. Similarly, as the prism carrier rotates around the second rotation axis, the second capacitance signal formed by the first and third floating plates is altered due to the skip bridging characteristic of the capacitance signal between the first and third floating plates. Therefore, the processing unit can determine the rotation angle of the prism carrier based on the changes in the first and second capacitance signals.
[0019] In this embodiment, the first, second, and third electrode plates are mounted on the base, and their positions remain unchanged during the rotation of the prism carrier. This allows for a more stable connection between the first, second, and third electrode plates and the processing unit, which is also located on the base. The rotating first, second, and third floating electrode plates do not require a wire connection to the processing unit. This eliminates the possibility of errors in the prism motor's rotation angle test due to bending, stretching, or damage to the wires caused by the prism carrier's rotation when connecting the electrode plates on the prism carrier to the processing unit on the base. In other words, the prism motor provided in this embodiment connects the processing unit on the base to the first, second, and third electrode plates, which are also located on the base, without requiring a wire connection between the processing unit and the floating electrode plates on the prism carrier, thus improving the reliability of the prism motor.
[0020] Using smaller first, second, and third electrodes, instead of larger Hall effect sensors, to detect the rotation angle of the prism carrier reduces the size of the prism motor. Determining the prism carrier's rotation angle based on changes in the first capacitance signal formed by the first and second electrodes, and the second capacitance signal formed by the first and third electrodes, is less susceptible to external environmental interference such as magnetic fields, resulting in higher reliability of the prism motor. Attached Figure Description
[0021] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 is a schematic diagram of a prism motor carrying a prism according to an embodiment of this disclosure;
[0023] Figure 2 is a schematic diagram of a prism carrier provided in an embodiment of this disclosure;
[0024] Figure 3 is a schematic diagram of a structure of the first electrode plate, the second electrode plate, the third electrode plate, the fourth electrode plate and the fifth electrode plate provided in an embodiment of this disclosure;
[0025] Figure 4 is a schematic diagram of a structure of a first electrode plate, a first floating electrode plate, a second floating electrode plate, a second electrode plate, and a processing unit provided in an embodiment of this disclosure;
[0026] Figure 5 is a schematic diagram of the principle of the jump bridging characteristics between the first electrode plate and the second electrode plate provided in the embodiment of this disclosure;
[0027] Figure 6 is a simulation diagram of the capacitance signal change when the prism carrier rotates around the second rotation axis according to an embodiment of this disclosure;
[0028] Figure 7 is a simulation diagram of the capacitance signal change when the prism carrier rotates around the first rotation axis according to an embodiment of this disclosure;
[0029] Figure 8 is a simulation diagram of the capacitance signal change when the prism carrier rotates around the third rotation axis according to an embodiment of this disclosure;
[0030] Figure 9 is a schematic diagram of a structure of the third floating electrode plate and the third electrode plate provided in an embodiment of this disclosure;
[0031] Figure 10 is a schematic diagram of a structure of the second electrode plate, the fourth electrode plate, the fifth electrode plate, the second floating electrode plate, the fourth floating electrode plate, and the fifth floating electrode plate provided in an embodiment of this disclosure.
[0032] Figure 11 is a schematic diagram of another structure of a prism carrier provided in an embodiment of this disclosure;
[0033] Figure 12 is a schematic diagram of another structure of the first electrode plate, second electrode plate, third electrode plate, fourth electrode plate and fifth electrode plate provided in the embodiments of this disclosure;
[0034] Figure 13 is a partial structural schematic diagram of a prism motor provided in an embodiment of this disclosure;
[0035] Figure 14 is a schematic diagram of another partial structure of the prism motor provided in an embodiment of this disclosure;
[0036] Figure 15 is a schematic diagram of a camera module provided in an embodiment of this disclosure. Detailed Implementation
[0037] As can be seen from the background technology, the size of the prism motor in the relevant technology needs to be reduced and its reliability needs to be improved.
[0038] This disclosure provides a prism motor, a camera module, and a camera device. In the prism motor, a processing unit located on the base is connected to a first electrode plate, a second electrode plate, and a third electrode plate, which are also located on the base. Furthermore, there is no need to provide wires to connect the processing unit to the floating electrode plate on the prism carrier, which can improve the reliability of the prism motor.
[0039] Using smaller first, second, and third electrodes, instead of larger Hall effect sensors, to detect the rotation angle of the prism carrier reduces the size of the prism motor. Determining the prism carrier's rotation angle based on changes in the first capacitance signal formed by the first and second electrodes, and the second capacitance signal formed by the first and third electrodes, is less susceptible to external environmental interference such as magnetic fields, resulting in higher reliability of the prism motor.
[0040] In the description of the embodiments of this disclosure, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.
[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0042] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0043] In the description of the embodiments of this disclosure, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.
[0044] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.
[0045] In the description of embodiments of this disclosure, when a component "includes" another component, other components are not excluded unless otherwise stated, and may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly" on the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Additionally, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.
[0046] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.
[0047] Figure 1 is a schematic diagram of a prism motor carrying a prism according to an embodiment of the present disclosure; Figure 2 is a schematic diagram of a prism carrier according to an embodiment of the present disclosure; Figure 3 is a schematic diagram of a first electrode plate, a second electrode plate, a third electrode plate, a fourth electrode plate, and a fifth electrode plate according to an embodiment of the present disclosure; Figure 4 is a schematic diagram of a first electrode plate, a first floating electrode plate, a second floating electrode plate, a second electrode plate, and a processing unit according to an embodiment of the present disclosure. In Figure 1, point O is the rotation center of the prism carrier.
[0048] Referring to Figures 1 to 4, the prism motor includes: a base 100; a prism carrier 101, rotatably mounted on the base 100; a first electrode plate 102 and a second electrode plate 103, disposed opposite to each other on the base 100; a third electrode plate 104, disposed on the base 100, with the plane of the first electrode plate 102 perpendicular to the plane of the third electrode plate 104; and a first floating electrode plate 112. A second floating electrode 112 is placed on the prism carrier 101 and is positioned opposite to the first electrode 102. When the prism carrier 101 rotates around the first rotation axis X and / or the second rotation axis Y, the area of the first floating electrode 112 facing the first electrode 102 increases, while the distance between them decreases. A second floating electrode 113 is placed on the prism carrier 101 and is positioned opposite to the second electrode 103. When the prism carrier 101 rotates around the first rotation axis X, the area of the second floating electrode 113 facing the second electrode 102 increases, while the distance between them decreases. The area and distance between the two facing poles 103 increase while the other decreases; the third floating pole plate 114 is disposed on the prism carrier 101 and is opposite to the third pole plate 104. When the prism carrier 101 rotates around the second rotation axis Y, the area and distance between the two facing poles 103 increase while the other decreases; wherein, the first floating pole plate 112 is electrically connected to the second floating pole plate 113 and the third floating pole plate 114, and the first pole plate 103... The first electrode 102 and the second electrode 103 form a first capacitance signal, and the first electrode 102 and the third electrode 104 form a second capacitance signal. The first rotation axis X is perpendicular to the second rotation axis Y. The processing unit 105 is located on the base 100. The first electrode 102, the second electrode 103 and the third electrode 104 are all connected to the processing unit 105. The processing unit 105 determines the rotation angle of the prism carrier 101 based on the changes in the first capacitance signal and the second capacitance signal when the prism carrier 101 rotates.
[0049] The base 100 is used to provide support for other components of the prism motor.
[0050] The prism carrier 101 is used to hold the prism 200.
[0051] The first capacitance signal formed by the first electrode plate 102 and the second electrode plate 103 is used to detect the angle of rotation of the prism carrier 101 around the first rotation axis X. The detection principle is as follows.
[0052] Figure 5 is a schematic diagram of the principle of the jump bridging characteristics between the first electrode plate and the second electrode plate provided in the embodiment of this disclosure.
[0053] Referring to Figures 1, 2, and 5, when detecting the first capacitance signal between the first electrode 102 and the second electrode 103, the first electrode 102 and the second electrode 103 are connected to the processing unit 105. The reference capacitance between the first electrode 102 and the second electrode 103 is measured through the charge transfer described above. Specifically, when a positive voltage signal is applied to the first electrode 102, a large amount of positive charge accumulates on the surface of the first electrode 102, and the first floating electrode 112 corresponding to the first electrode 102 accumulates negative charge. Since the first floating electrode 112 and the second floating electrode 113 have no external circuit, the charge does not transfer. Furthermore, because the charge of the electrically connected first floating electrode 112 and the second floating electrode 113 is conserved, positive charge accumulates on the second floating electrode 113, i.e., on the side closer to the second electrode 103. This side of the second electrode 103 is then affected by the positive charge of the second floating electrode 113, and negative charge accumulates on its surface, thus completing the capacitance effect between the two electrodes.
[0054] The first electrode 102 and the first floating electrode 112 constitute a first sub-capacitor signal, and the second electrode 103 and the second floating electrode 113 constitute a second sub-capacitor signal. The first capacitor signal between the first electrode 102 and the second electrode 103 is a series capacitor signal of the first and second sub-capacitor signals. When the prism carrier 101 rotates around the first rotation axis X, one of the facing areas and distances between the first floating electrode 112 and the first electrode 102 increases, and the other decreases; similarly, one of the facing areas and distances between the second floating electrode 113 and the second electrode 103 increases, and the other decreases. According to the capacitor signal calculation formula, the capacitor signal is positively correlated with the facing areas of the two electrodes and negatively correlated with the distance between the two electrodes. In other words, when the prism carrier 101 rotates around the first rotation axis X, both the first capacitor signal and the second sub-capacitor signal change, causing a change in the first capacitor signal. Therefore, the rotation angle of the prism carrier 101 around the first rotation axis X can be determined by the change in the first capacitor signal.
[0055] Furthermore, when the prism carrier 101 rotates around the first rotation axis X, the facing area and distance between the first electrode plate 102 and the first floating electrode plate 112, as well as the facing area and distance between the second electrode plate 103 and the second floating electrode plate 113, change simultaneously. The change in facing area and distance has the same effect on the capacitance signal; that is, both changes in facing area and distance lead to an increase in the capacitance signal, or both lead to a decrease in the capacitance signal. Therefore, compared to changing only one of the facing area and distance, simultaneously changing both results in a larger change in the amplitude of the first sub-capacitor signal and the second sub-capacitor signal under the same rotation angle. This means a larger change in the amplitude of the first capacitance signal, making the prism motor more sensitive to the angular rotation of the prism carrier 101 and improving the reliability of the prism motor's angle detection.
[0056] The second capacitance signal formed by the first electrode 102 and the third electrode 104 is used to detect the rotation angle of the prism carrier 101 around the second rotation axis Y. The detection principle is the same as that described above regarding the formation of the first capacitance signal by the first electrode 102 and the second electrode 103.
[0057] Referring again to Figures 1 to 3, in some embodiments, the prism motor includes: two second floating pole plates 113 arranged parallel to the first rotation axis X, two second pole plates 103 arranged parallel to the first rotation axis X, two third floating pole plates 114 arranged parallel to the second rotation axis Y, and two third pole plates 104 arranged parallel to the second rotation axis Y; wherein, one second floating pole plate 113a is arranged opposite to one second pole plate 103a, another second floating pole plate 113b is arranged opposite to another second pole plate 103b, one third floating pole plate 114 is arranged opposite to one third pole plate 104, and another third floating pole plate 114 is arranged opposite to another third pole plate 104.
[0058] It is understandable that, for ease of illustration, the two second plates in the attached diagram are labeled as 103a and 103b, respectively, and the two second floating plates are labeled as 113a and 113b, respectively.
[0059] Two second electrode plates 103 and two corresponding second floating electrode plates 113 are set. The capacitance signal between one second electrode plate 103a and the first electrode plate 102 is set as C1, and the capacitance signal between the other second electrode plate 103b and the other first electrode plate 102 is set as C2. The rotation angle of the prism carrier 101 around the first rotation axis X can be detected by (C1+C2).
[0060] Figure 6 is a simulation diagram of the capacitance signal change when the prism carrier rotates around the second rotation axis according to an embodiment of this disclosure. Line A1 represents C. y1The change in capacitance signal due to the rotation of the prism carrier around the second rotation axis is represented by line A2, which indicates C. y2 The capacitance signal changes as the prism carrier rotates around the second rotation axis. In Figure 6, the horizontal axis Ytitl represents the angle of rotation of the prism carrier around the second rotation axis, degmin is the unit of angle minutes (1 degree equals 60 minutes), and the vertical axis Capacitance represents the capacitance signal, fF is the unit of capacitance signal picofarad.
[0061] Referring to Figure 6, two third electrode plates 104 and two corresponding third floating electrode plates 114 are set, and the second capacitor signal between the first third electrode plate 104 and the first electrode plate 102 is set to C. y1 The signal of the second capacitor between the third electrode 104 and the first electrode 102 is C. y2 As can be seen from Figure 6, C y1 and C y2 It exhibits excellent linearity and good capacitive sensitivity within a normal operating range of ±1 degree (60 min). Therefore, using two third plates 104 allows for precise detection of the rotation angle of the prism carrier 101 around the second rotation axis Y. Furthermore, since the Y-axis requires high vertical stabilization in practical applications, the second plate is designed to be separately mounted on one surface of the base 100, resulting in even better capacitive sensitivity.
[0062] Additionally, it can be done through (C) y1 -C y2 ) / (C y1 +C y2 The results of the two second capacitor signals are differentially processed to offset the influence of environmental factors on the two second capacitor signals, thereby improving the reliability of the prism motor detection angle.
[0063] In some embodiments, the prism motor further includes: a fourth pole plate 106, which is located on the base 100 and on the same surface as the second pole plate 103 on the base 100, and is connected to the processing unit 105; and a fourth floating pole plate 116, which is located on the prism carrier 101 and in the same plane as the second floating pole plate 113, and is disposed opposite to the fourth pole plate 106. When the prism carrier 101 rotates around the third rotation axis Z, the fourth floating pole plate 116... The area and distance between the first floating plate 112 and the first plate 102 facing each other increase while the other decreases. The third rotation axis Z is perpendicular to the first rotation axis X and the second rotation axis Y. The fourth plate 106 and the first plate 102 form a third capacitance signal. The processing unit 105 determines the rotation angle of the prism carrier 101 based on the changes in the first capacitance signal, the second capacitance signal and the third capacitance signal.
[0064] When the prism carrier 101 rotates around the third rotation axis Z, one of the facing areas and distances between the fourth floating electrode 116 and the first electrode 102 increases while the other decreases, and the other of the facing areas and distances between the first floating electrode 112 and the first electrode 102 also increases while the other decreases. Therefore, when the prism carrier 101 rotates around the third rotation axis Z, the third capacitance signal formed by the fourth electrode 106 and the first electrode 102 will change, and the rotation angle of the prism carrier 101 around the third rotation axis Z can be determined by observing the change in the third capacitance signal.
[0065] The principle of the third capacitor signal formed by the fourth electrode 106 and the first electrode 102 can be referred to the principle of the first capacitor signal formed by the first electrode 102 and the second electrode 103.
[0066] Furthermore, when the prism carrier 101 rotates around the third rotation axis Z, one of the facing areas and the distance between the second floating electrode 113 and the second electrode 103 can increase, while the other can decrease. That is, when the prism carrier 101 rotates around the third rotation axis Z, the second capacitor signal will also change. Let the third capacitor signal formed by the fourth electrode 106 and the first electrode 102 be C3. The rotation angle of the prism carrier 101 around the third rotation axis Z can be determined by (C1+C3).
[0067] Referring again to Figures 1 to 3, in some embodiments, the prism motor further includes: a fifth electrode plate 107, which is located on the base 100 and on the same surface as the second electrode plate 103 on the base 100, and is connected to the processing unit 105; and a fifth floating electrode plate 117, which is located on the prism carrier 101 and in the same plane as the second floating electrode plate 113, and is arranged opposite to the fifth electrode plate 107. When the prism carrier 101 rotates around the first rotation axis X and / or the third rotation axis Z, one of the facing area and the distance between the fifth floating electrode plate 117 and the fifth electrode plate 107 increases and the other decreases. The fifth electrode plate 107 and the first electrode plate 102 form a fourth capacitance signal, and the processing unit 105 determines the rotation angle of the prism carrier 101 based on the changes in the first capacitance signal, the second capacitance signal, the third capacitance signal, and the fourth capacitance signal.
[0068] The principle of the fourth capacitor signal formed by the fifth electrode 107 and the first electrode 102 can be referred to the principle of the first capacitor signal formed by the second electrode 103 and the first electrode 102. Let the fourth capacitor formed by the fifth electrode 107 and the first electrode 102 be C4.
[0069] Figure 7 is a simulation diagram of the capacitance signal change when the prism carrier rotates around the first rotation axis according to an embodiment of this disclosure. Line B1 represents the capacitance signal change of (C3+C4) and the prism carrier rotating around the first rotation axis, and line B2 represents the capacitance signal change of (C1+C2) and the prism carrier rotating around the first rotation axis. In Figure 7, the horizontal axis Xtitl represents the angle of rotation of the prism carrier around the first rotation axis, degmin is the unit of angle minutes (1 degree equals 60 minutes), and the vertical axis Capacitance represents the capacitance signal, fF is the unit of capacitance signal picofarads.
[0070] Two second electrode plates 103, a fourth electrode plate 106, and a fifth electrode plate 107 are disposed on one surface of the base 100. Referring to Figure 7, (C1+C2) and (C3+C4) show a good linear relationship with the rotation angle of the detection prism carrier 101 about the first rotation axis X. (C1+C2) and (C3+C4) can be used as two sets of signals to detect the rotation angle of the detection prism carrier 101 about the first rotation axis X. Furthermore, C... x1 =C1+C2, C x2 =C3+C4, can be obtained through (C x1 -C x2 ) / (C x1 +C x2 Differential processing is performed to offset the influence of environmental factors on the capacitor signal, thereby improving the reliability of the prism motor's detection angle.
[0071] Figure 8 is a simulation diagram of the capacitance signal change when the prism carrier rotates around the third rotation axis according to an embodiment of this disclosure. Line D1 represents the capacitance signal change of (C1+C3) and the prism carrier rotating around the third rotation axis, and line D2 represents the capacitance signal change of (C2+C4) and the prism carrier rotating around the third rotation axis Z. In Figure 8, the horizontal axis Ztitl represents the angle of rotation of the prism carrier around the third rotation axis, degmin is the unit of angle minutes (1 degree equals 60 minutes), and the vertical axis Capacitance represents the capacitance signal, fF is the unit of capacitance signal picofarads.
[0072] Referring to Figure 8, (C1+C3) and (C2+C4) show a good linear relationship with the rotation angle of the detection prism carrier 101 about the third rotation axis Z. Therefore, (C1+C3) and (C2+C4) can be used as two sets of signals to detect the rotation angle of the detection prism carrier 101 about the third rotation axis Z. Furthermore, C is set... z1 =C1+C3, C z2 =C2+C4, which can be obtained through (C z1 -C z2 ) / (C z1 +C z2 Differential processing is performed to offset the influence of environmental factors on the capacitor signal, thereby improving the reliability of the prism motor's detection angle.
[0073] Figure 9 is a schematic diagram of a structure of the third floating electrode plate and the third electrode plate provided in an embodiment of this disclosure.
[0074] Referring to Figures 2, 3, and 9, in some embodiments, in the direction parallel to the second rotation axis Y, the cross-sections of the third pole plate 104 and the third floating pole plate 114 are both rectangular, the longer side of the third pole plate 104 is greater than the longer side of the third floating pole plate 114, and the projections of the third pole plate 104 and the third floating pole plate 114 onto the plane containing the second rotation axis Y and the third rotation axis Z satisfy the following: the distance L between the shorter side of the third pole plate 104 and the third rotation axis Z. 11 The distance L between the short side of the third floating pole plate 114 and the third rotation axis Z is greater than that between the pole plate 114 and the third rotation axis Z. 12 In a direction parallel to the first rotation axis X, the cross-sections of the second floating electrode plate 113, the fourth floating electrode plate 116, the fifth floating electrode plate 117, the second electrode plate 103, the fourth electrode plate 106, and the fifth electrode plate 107 are rectangles with the same area.
[0075] The long side of the third electrode plate 104 is greater than the long side of the third floating electrode plate 114, and the distance L between the short side of the third electrode plate 104 and the third rotation axis Z is... 11 The distance L between the short side of the third floating pole plate 114 and the third rotation axis Z is greater than that between the pole plate 114 and the third rotation axis Z. 12This is to ensure that the facing area between the third electrode plate 104 and the third floating electrode plate 114 remains as unchanged as possible when the prism carrier 101 rotates around the first rotation axis X and / or the third rotation axis Z, thereby reducing the impact of the prism carrier 101 rotating around the first rotation axis X and / or the third rotation axis Z on the second capacitor signal.
[0076] Furthermore, compared to the scheme where the short sides of the third electrode plate 104 and the third floating electrode plate 114 both extend along the second rotation axis Y, in the prism motor provided in this embodiment, the long sides of the third electrode plate 104 and the third floating electrode plate 114 both extend along the second rotation axis Y. The prism carrier 101 rotates around the second rotation axis Y by the same angle, resulting in a larger change in the facing area of the third electrode plate 104 and the third floating electrode plate 114. This leads to a larger change in the second capacitance signal, making the detection of the rotation of the prism carrier 101 around the second rotation axis Y more sensitive, thereby improving the reliability of the prism motor's detection angle.
[0077] In some embodiments, two second floating electrode plates 113 are symmetrically arranged about a third rotation axis Z, one second floating electrode plate 113a and a fourth floating electrode plate 116 are symmetrically arranged about a first rotation axis X, and another second floating electrode plate 113b and a fifth floating electrode plate 117 are symmetrically arranged about a first rotation axis X.
[0078] Referring to Figures 2, 3, and 9, in some embodiments, the projections of the third electrode plate 104 and the third floating electrode plate 114 onto the plane containing the second rotation axis Y and the third rotation axis Z satisfy the following: the maximum distance L between the third floating electrode plate 114 and the second rotation axis Y. 13 Greater than the maximum distance L between the third electrode plate 104 and the second rotation axis Y 14 The minimum distance L between the third floating pole plate 114 and the second rotation axis Y 15 The distance L between the third electrode plate 104 and the second rotation axis Y is greater than the minimum distance between them. 16 This arrangement is to ensure that when the prism carrier 101 rotates around the second rotation axis Y, one of the facing areas and the distance between the third floating electrode plate 114 and the third electrode plate 104 increases while the other decreases.
[0079] In some examples, L 13 -L 14 ≤0.2mm; L 15 -L 16 ≤0.2mm.
[0080] Figure 10 is a schematic diagram of a structure of the second electrode plate, the fourth electrode plate, the fifth electrode plate, the second floating electrode plate, the fourth floating electrode plate, and the fifth floating electrode plate provided in an embodiment of this disclosure.
[0081] Referring to Figures 2, 3, and 10, the projections of the second electrode plate 103 and the second floating electrode plate 113 onto the plane containing the first rotation axis X and the third rotation axis Z satisfy the following condition: the maximum distance L between the second floating electrode plate 113 and the first rotation axis X is... 21 Greater than the maximum distance L between the second electrode plate 103 and the first rotation axis X 22 The minimum distance L between the second floating pole plate 113 and the first rotation axis X 23 The distance L between the second electrode plate 103 and the first rotation axis X is greater than the minimum distance between them. 24 Furthermore, since the two second floating pole plates 113 are symmetrically arranged about the third rotation axis Z, one second floating pole plate 113a and the fourth floating pole plate 116 are symmetrically arranged about the first rotation axis X, and the other second floating pole plate 113b and the fifth floating pole plate 117 are symmetrically arranged about the first rotation axis X. Therefore, the maximum distance between the fourth floating electrode plate 116 and the first rotation axis X is also greater than the maximum distance between the fourth electrode plate 106 and the first rotation axis X, and the minimum distance between the fourth floating electrode plate 116 and the first rotation axis X is also greater than the minimum distance between the fourth electrode plate 106 and the first rotation axis X. The maximum distance between the fifth floating electrode plate 117 and the first rotation axis X is greater than the maximum distance between the fourth electrode plate 106 and the first rotation axis X, and the minimum distance between the fourth floating electrode plate 116 and the first rotation axis X is greater than the minimum distance between the fourth electrode plate 106 and the first rotation axis X. When the prism carrier 101 rotates around the first rotation axis X, one of the facing areas and distances between the second floating electrode plate 113 and the second electrode plate 103 increases, and the other decreases; one of the facing areas and distances between the fourth floating electrode plate 116 and the fourth electrode plate 106 increases, and the other decreases; one of the facing areas and distances between the fifth floating electrode plate 117 and the fifth electrode plate 107 increases, and the other decreases.
[0082] In some examples, L 21 -L 22 ≤0.2mm; L 23 -L 24 ≤0.2mm.
[0083] The maximum distance L between the second floating electrode plate 113 and the third rotating axis Z 25 Greater than the maximum distance L between the second electrode plate 103 and the third rotation axis Z 26 The minimum distance L between the second floating pole plate 113 and the third rotating axis Z 27 The distance L between the second electrode plate 103 and the third rotation axis Z is greater than the minimum distance between them. 28Furthermore, since the two second floating pole plates 113 are symmetrically arranged about the third rotation axis Z, one second floating pole plate 113a and the fourth floating pole plate 116 are symmetrically arranged about the first rotation axis X, and the other second floating pole plate 113b and the fifth floating pole plate 117 are symmetrically arranged about the first rotation axis X. Therefore, the maximum distance between the fourth floating electrode plate 116 and the third rotation axis Z is greater than the maximum distance between the fourth electrode plate 106 and the third rotation axis Z; the minimum distance between the fourth floating electrode plate 116 and the third rotation axis Z is greater than the minimum distance between the fourth electrode plate 106 and the third rotation axis Z; the maximum distance between the fifth floating electrode plate 117 and the third rotation axis Z is greater than the maximum distance between the fourth electrode plate 106 and the third rotation axis Z; and the minimum distance between the fourth floating electrode plate 116 and the third rotation axis Z is greater than the minimum distance between the fourth electrode plate 106 and the third rotation axis Z. When the prism carrier 101 rotates around the third rotation axis Z, one of the facing areas and distances between the second floating electrode plate 113 and the second electrode plate 103 increases, and the other decreases; one of the facing areas and distances between the fourth floating electrode plate 116 and the fourth electrode plate 106 increases, and the other decreases; and one of the facing areas and distances between the fifth floating electrode plate 117 and the fifth electrode plate 107 increases, and the other decreases.
[0084] In some examples, L 25 -L 26 ≤0.2mm; L 27 -L 28 ≤0.2mm.
[0085] In some embodiments, on the surface of the base 100 perpendicular to the second rotation axis Y, the orthographic projection of the first floating electrode plate 112 is located within the orthographic projection of the first electrode plate 102. This ensures that the first floating electrode plate 112 does not extend beyond the first electrode plate 102, so that the first floating electrode plate 112 can receive all electrical signals sent by the first electrode plate 102, thereby improving the reliability of the prism motor.
[0086] In some embodiments, the first electrode plate 102, the second electrode plate 103, the third electrode plate 104, the fourth electrode plate 106, and the fifth electrode plate 107 are integrally formed with the base 100; the first floating electrode plate 112, the second floating electrode plate 113, the third floating electrode plate 114, the fourth floating electrode plate 116, and the fifth floating electrode plate 117 are integrally formed with the prism carrier 101. This configuration facilitates the assembly and mass production of the prism motor.
[0087] The prism carrier 101 can be made of conductive material, and the first floating electrode 112, the second floating electrode 113, the third floating electrode 114, the fourth floating electrode 116, and the fifth floating electrode 117 are electrically connected through the prism carrier 101.
[0088] In other embodiments, the prism carrier 101 can be made of an insulating material. The prism motor includes connecting conductors, and the first floating electrode plate 112, the second floating electrode plate 113, the third floating electrode plate 114, the fourth floating electrode plate 116, and the fifth floating electrode plate 117 are connected by the connecting conductors. The first electrode plate 102, the second electrode plate 103, the third electrode plate 104, the fourth electrode plate 106, and the fifth electrode plate 107 are connected by a flexible circuit board and then attached to the prism carrier 101.
[0089] Referring again to Figure 1, the base 100 includes a bottom surface 110 and a first side surface 110, a second side surface 130, and a third side surface 140 that are perpendicularly connected to the bottom surface 110. The direction of the first side surface 110 pointing towards the second side surface 130 is parallel to the second rotation axis YY.
[0090] Referring to Figures 1 and 2, the first electrode plate 102 can be disposed on the first side surface 110, and the second electrode plate 103, the fourth electrode plate 106, and the fifth electrode plate 107 can be disposed on the third side surface 140. In other embodiments, the first electrode plate 102 can also be disposed on the third side surface 140, and the second electrode plate 103, the fourth electrode plate 106, and the fifth electrode plate 107 can be disposed on the first side surface 110.
[0091] Figure 11 is a schematic diagram of another structure of a prism carrier provided in an embodiment of the present disclosure, and Figure 12 is a schematic diagram of another structure of the first electrode plate, the second electrode plate, the third electrode plate, the fourth electrode plate and the fifth electrode plate provided in an embodiment of the present disclosure.
[0092] Referring to Figures 1, 2, and 3, the third electrode plate 104 can be disposed on the bottom surface 110. Referring to Figures 10 to 12, the third electrode plate 104 can also be disposed on the second side surface 130.
[0093] Figure 13 is a partial structural schematic diagram of a prism motor provided in an embodiment of the present disclosure, and Figure 14 is another partial structural schematic diagram of a prism motor provided in an embodiment of the present disclosure. Figures 13 and 14 mainly illustrate the positional distribution of the magnet and the coil in the prism motor.
[0094] Referring to Figures 1, 13 and 14, in some embodiments, the prism motor further includes a magnet 108 and a coil 109. The magnet 108 is disposed on the prism carrier 101; the coil 109 is disposed on the base 100 and connected to the processing unit 105. Under the control of the processing unit 105, the coil 109 drives the magnet 108 to rotate the prism carrier 101.
[0095] When the processing unit 105 detects the rotation angle of the prism carrier 101, the processing unit 105 controls the magnitude and direction of the current in the coil 109 to drive the magnet 108 to rotate the prism carrier 101 in order to perform jitter compensation control.
[0096] Specifically, magnet 108 includes a first magnet 118, a second magnet 128, and a third magnet 138, and coil 109 includes a first coil 119, a second coil 129, and a third coil 139. The first magnet 118 is disposed opposite to the first coil 119, the second magnet 128 is disposed opposite to the second coil 129, and the third magnet 138 is disposed opposite to the third coil 139.
[0097] The first magnet 118 and the first coil 119 are used to drive the prism carrier 101 to rotate around the first rotation axis X. The second magnet 128 and the second coil 129 are used to drive the prism carrier 101 to rotate around the second rotation axis Y. The third magnet 138 and the third coil 139 are used to drive the prism carrier 101 to rotate around the third rotation axis Z.
[0098] The first coil 119 can be located on the bottom surface 110, and the second coil 129 and the third coil 139 can be located on the second side surface 130 at the same time.
[0099] The number of first coils 119 can be 2, and the number of first magnets 118 can be 4. Two first magnets 118 are in contact with each other to form a group and are arranged opposite to a first coil 119.
[0100] The number of second coils 129 can be 1, and the number of second magnets 128 can be 2. Two second magnets 128 are in contact with each other as a group and are arranged opposite to one second coil 129.
[0101] The number of third coils 139 can be 2, and the number of third magnets 138 can be 4. Two third magnets 138 are in contact with each other as a group and are set opposite to a first coil 119.
[0102] It should be noted that the positions and quantities of the first coil 119, the second coil 129, and the third coil 139 on the base 100, and the positions and quantities of the first magnet 118, the second magnet 128, and the third magnet 138 on the prism carrier 101 are shown in Figures 13 and 14 for illustrative purposes only. The positions and quantities of the first coil 119, the second coil 129, the third coil 139, the first magnet 118, the second magnet 128, and the third magnet 138 can be adjusted according to the user's actual needs.
[0103] In some embodiments, the prism motor further includes sheet metal wiring (not shown), which is used to connect the first electrode plate 102, the second electrode plate 103, the third electrode plate 104, the fourth electrode plate 106, and the fifth electrode plate 107 to the processing unit 105 respectively. The sheet metal wiring is also used to connect the first coil 119, the second coil 129, and the third coil 139 to the processing unit 105 respectively.
[0104] In a specific example, the first floating electrode plate 112, the second floating electrode plate 113, the third floating electrode plate 114, the fourth floating electrode plate 116, the fifth floating electrode plate 117, the first magnet 118, the second magnet 128, and the third magnet 138 are cast onto the prism carrier 101 using plastic. The base 100 is a plastic base 100, and the sheet metal circuit, the first electrode plate 102, the second electrode plate 103, the third electrode plate 104, the fourth electrode plate 106, the fifth electrode plate 107, the first coil 119, the second coil 129, the third coil 139, and the processing unit 105 are all embedded in the base 100.
[0105] In the aforementioned prism motor, the processing unit 105 located on the base 100 is connected to the first electrode plate 102, the second electrode plate 103, and the third electrode plate 104, which are also located on the base 100. Furthermore, there is no need to provide wires to connect the processing unit 105 to the floating electrode plate provided on the prism carrier 101, which can improve the reliability of the prism motor.
[0106] Using smaller first electrode plates 102, 103, and 104, instead of larger Hall effect sensors, to detect the rotation angle of the prism carrier 101 reduces the size of the prism motor. Determining the rotation angle of the prism carrier 101 based on changes in the first capacitance signal formed by the first electrode plates 102 and 103, and the second capacitance signal formed by the first electrode plates 102 and 104, is less susceptible to interference from external environments such as magnetic fields, resulting in higher reliability of the prism motor.
[0107] Accordingly, another embodiment of this disclosure also provides a camera module including the prism motor of any of the above embodiments. The prism module provided in another embodiment of this disclosure will be described below. For parts that are the same as or corresponding to the previous embodiment, please refer to the corresponding descriptions of the foregoing embodiments; detailed descriptions will not be repeated below.
[0108] Figure 15 is a schematic diagram of a camera module provided in an embodiment of this disclosure. The dashed lines in Figure 15 represent the optical path of the incident light from the camera module.
[0109] Referring to Figures 1, 12 and 15, the camera module also includes a prism 200, a lens 201 and a photosensitive chip 202. The incident light entering the camera module is reflected by the prism 200 on the prism motor and passes through the lens 201 to reach the photosensitive chip 202.
[0110] Specifically, incident light enters the camera module through the light-transmitting sheet 203, and the propagation direction of the incident light is changed by the reflective surface 210 of the prism 200, so that the incident light can penetrate the lens 201 perpendicularly, and after the lens 201 moves and zooms, it is projected onto the photosensitive chip 202 to achieve the shooting of telephoto images.
[0111] Accordingly, another embodiment of this disclosure also provides a camera device, including the prism motor or camera module in any of the above embodiments. The camera device provided in another embodiment of this disclosure will be described below. For parts that are the same as or corresponding to the previous embodiment, please refer to the corresponding descriptions of the foregoing embodiments; detailed descriptions will not be repeated below.
[0112] Camera equipment refers to electronic devices with camera functions, such as cameras, camcorders, and mobile phones.
[0113] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of this disclosure. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.
Claims
1. A prism motor, comprising: Base; A prism carrier, which is rotatably mounted on the base; A first electrode plate and a second electrode plate are disposed opposite to each other on the base; The third electrode plate is disposed on the base, and the plane on which the first electrode plate is located is perpendicular to the plane on which the third electrode plate is located; The first floating electrode plate is disposed on the prism carrier and is disposed opposite to the first electrode plate. When the prism carrier rotates around the first rotation axis and / or the second rotation axis, one of the facing area and the distance between the first floating electrode plate and the first electrode plate increases and the other decreases. The second floating electrode plate is disposed on the prism carrier and is disposed opposite to the second electrode plate. When the prism carrier rotates around the first rotation axis, one of the facing area and the distance between the second floating electrode plate and the second electrode plate increases and the other decreases. The third floating electrode plate is disposed on the prism carrier and is disposed opposite to the third electrode plate. When the prism carrier rotates around the second rotation axis, one of the facing area and the distance between the third floating electrode plate and the third electrode plate increases and the other decreases. The first floating electrode plate is electrically connected to the second floating electrode plate and the third floating electrode plate. The first electrode plate and the second electrode plate form a first capacitance signal, and the first electrode plate and the third electrode plate form a second capacitance signal. The first rotation axis is perpendicular to the second rotation axis. A processing unit is located on the base. The first electrode plate, the second electrode plate, and the third electrode plate are all connected to the processing unit. The processing unit determines the rotation angle of the prism carrier based on the changes in the first capacitance signal and the second capacitance signal when the prism carrier rotates.
2. The prism motor according to claim 1, wherein, The prism motor includes: two second floating pole plates arranged parallel to the first rotation axis, two second pole plates arranged parallel to the first rotation axis, two third floating pole plates arranged parallel to the second rotation axis, and two third pole plates arranged parallel to the second rotation axis; wherein, one second floating pole plate is arranged opposite to one second pole plate, another second floating pole plate is arranged opposite to another second pole plate, one third floating pole plate is arranged opposite to one third pole plate, and another third floating pole plate is arranged opposite to another third pole plate.
3. The prism motor according to claim 2, wherein, The prism motor also includes: A fourth electrode plate is located on the base and on the same surface as the second electrode plate on the base. The fourth electrode plate is connected to the processing unit. The fourth floating electrode plate is located on the prism carrier and is in the same plane as the second floating electrode plate. The fourth floating electrode plate is arranged opposite to the second electrode plate. When the prism carrier rotates around the third rotation axis, one of the facing area and the distance between the fourth floating electrode plate and the second electrode plate increases and the other decreases. Also, one of the facing area and the distance between the first floating electrode plate and the first electrode plate increases and the other decreases. Wherein, the third rotation axis is perpendicular to the first rotation axis, the third rotation axis is perpendicular to the second rotation axis, the fourth electrode plate forms a third capacitance signal with the first electrode plate, and the processing unit determines the rotation angle of the prism carrier based on the changes of the first capacitance signal, the second capacitance signal and the third capacitance signal.
4. The prism motor according to claim 3, wherein, The prism motor also includes: The fifth electrode plate is located on the base and is on the same surface as the second electrode plate on the base. The fifth electrode plate is connected to the processing unit. The fifth floating pole plate is located on the prism carrier and is in the same plane as the second floating pole plate. The fifth floating pole plate is arranged opposite to the second floating pole plate. When the prism carrier rotates around the first rotation axis and / or the third rotation axis, one of the facing area and the distance between the fifth floating pole plate and the second floating pole plate increases and the other decreases. The fifth electrode plate and the first electrode plate form a fourth capacitance signal. The processing unit determines the rotation angle of the prism carrier based on the changes in the first capacitance signal, the second capacitance signal, the third capacitance signal, and the fourth capacitance signal.
5. The prism motor according to claim 4, wherein, In a direction parallel to the second rotation axis, the cross-sections of the third pole plate and the third floating pole plate are both rectangular. The long side of the third pole plate is greater than the long side of the third floating pole plate. The projections of the third pole plate and the third floating pole plate onto the planes containing the second and third rotation axes satisfy the following condition: the distance between the short side of the third pole plate and the third rotation axis is greater than the distance between the short side of the third floating pole plate and the third rotation axis. In a direction parallel to the first rotation axis, the cross-sections of the second floating electrode plate, the fourth floating electrode plate, the fifth floating electrode plate, the second electrode plate, the fourth electrode plate, and the fifth electrode plate are rectangles with the same area.
6. The prism motor according to claim 5, wherein, Two second floating pole plates are symmetrically arranged about the third rotation axis, one second floating pole plate and the fourth floating pole plate are symmetrically arranged about the first rotation axis, and the other second floating pole plate and the fifth floating pole plate are symmetrically arranged about the first rotation axis.
7. The prism motor according to claim 6, wherein, The projections of the third electrode plate and the third floating electrode plate onto the plane containing the second rotation axis and the third rotation axis satisfy the following: the maximum distance between the third floating electrode plate and the third rotation axis is greater than the maximum distance between the third electrode plate and the third rotation axis, and the minimum distance between the third floating electrode plate and the second rotation axis is greater than the minimum distance between the third electrode plate and the second rotation axis. The projections of the second electrode plate and the second floating electrode plate onto the planes containing the first rotation axis and the third rotation axis satisfy the following conditions: the maximum distance between the second floating electrode plate and the first rotation axis is greater than the maximum distance between the second electrode plate and the first rotation axis, and the minimum distance between the second floating electrode plate and the first rotation axis is greater than the minimum distance between the second electrode plate and the first rotation axis; the maximum distance between the second floating electrode plate and the third rotation axis is greater than the maximum distance between the second electrode plate and the third rotation axis, and the minimum distance between the second floating electrode plate and the third rotation axis is greater than the minimum distance between the second electrode plate and the third rotation axis.
8. The prism motor according to any one of claims 1 to 7, wherein, On the surface of the base perpendicular to the second rotation axis, the orthographic projection of the first floating electrode plate is located within the orthographic projection of the first electrode plate.
9. A camera module, comprising: The prism motor as described in any one of claims 1 to 8; A prism, which is mounted on a prism carrier.
10. A camera device comprising a prism motor as described in any one of claims 1 to 8, or a camera module as described in claim 9.