Prism motor, rotation angle measurement method for prism motor, and camera device

Abstract

Embodiments of the present application relate to the technical field of electronic products. Provided are a prism motor, a rotation angle measurement method for the prism motor, and a camera device. The prism motor comprises a base, a prism carrier, a first electrode plate, at least two second electrode plates, and a conductor plate. The base comprises a bottom plate and a side plate. The prism carrier is disposed above the bottom plate. The prism carrier can rotate relative to the base about a first rotation axis and a second rotation axis. The first electrode plate is located on the surface of the bottom plate. The second electrode plates are located on the surface of the side plate facing the prism carrier. The conductor plate comprises a first conductor plate and a second conductor plate which are electrically connected to each other. During the rotation of the prism carrier relative to the base about the first rotation axis, the overlapping area between the orthographic projection of one second electrode plate on the side plate and the orthographic projection of the second conductor plate on the side plate increases, and the overlapping area between the orthographic projection of the other second electrode plate on the side plate and the orthographic projection of the second conductor plate on the side plate decreases, thereby at least improving the anti-shake precision of the prism motor.

Description

Prism motor, prism motor rotation angle detection method, and camera device CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present disclosure claims priority to Chinese Patent Application No. 202411104150.7, filed on August 12, 2024, entitled “Prism motor, prism motor rotation angle detection method, and camera device,” which is incorporated by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to the technical field of electronic products, and in particular to a prism motor, a prism motor rotation angle detection method, and a camera device. BACKGROUND

[0003] With the development of technology, many electronic devices (such as tablet computers or smart phones) today are equipped with lens modules and have camera or video functions. Lenses can be roughly divided into wide-angle lenses with short focal lengths and telephoto lenses with long focal lengths; however, placing a long focal length lens in an optical module increases the thickness of the electronic device, making it difficult to meet the requirements of mobile terminal devices for thin and light thinness. In the prior art, a periscope type design is usually used, that is, the optical path is arranged horizontally and a turning prism is added to turn the optical path by 90°, so that the entire optical system is laid flat to reduce the overall height.

[0004] The periscope lens driving device includes a reflection module (prism motor) and a lens module (periscope motor), the reflection module reflects the imaging light by 90° and then enters the lens module, and the lens module performs focusing and imaging. The anti-shake scheme of the periscope module is responsible for anti-shake in two directions by the reflection module and the lens module respectively or jointly.

[0005] However, the anti-shake of the prism motor has the problem of poor precision. SUMMARY

[0006] Embodiments of the present application provide a prism motor, a prism motor rotation angle detection method, and a camera device, which at least help to improve the anti-shake precision of the prism motor.

[0007] According to some embodiments of the present application, the prism motor comprises a base, the base comprising a bottom plate and a side plate perpendicular to each other; a prism carrier, the prism carrier being arranged above the bottom plate, the prism carrier being used to carry a prism, the prism carrier being rotatable relative to the base about a first rotation axis and a second rotation axis, the first rotation axis and the second rotation axis being parallel to the surface of the bottom plate, the intersection of the first rotation axis and the second rotation axis being a rotation center, the first rotation axis being perpendicular to the surface of the side plate; a first pole plate, the first pole plate being located on the surface of the bottom plate, the geometric center of the first pole plate on the bottom plate being coincident with the projection of the rotation center on the bottom plate; at least two second pole plates, the second pole plates being located on the surface of the side plate facing the prism carrier; a conductor plate, the conductor plate comprising a first conductor plate and a second conductor plate electrically connected to each other, the first conductor plate being located on the bottom surface of the prism carrier and being arranged opposite to the first pole plate, the second conductor plate being located on the side surface of the prism carrier and being arranged opposite to the second pole plate, the projection of the first conductor plate on the surface of the bottom plate being overlapped with the projection of the first pole plate on the surface of the bottom plate, during the rotation of the prism carrier about the first rotation axis relative to the base, the overlapped area of the projection of at least one second pole plate on the surface of the side plate and the projection of the second conductor plate on the surface of the side plate increases, and the overlapped area of the projection of at least one second pole plate on the surface of the side plate and the projection of the second conductor plate on the surface of the side plate decreases.

[0008] In some embodiments, the second pole plate is rectangular in shape, the second conductor plate is rectangular in shape, the projection of the second conductor plate on the surface of the side plate intersects with the projection of the second pole plate on the surface of the side plate, and the length directions of the two second pole plates intersect.

[0009] In some embodiments, the second conductor plate is L-shaped in shape, the second pole plate is rectangular in shape, the projection of one second pole plate on the surface of the side plate intersects with the projection of one side of the second conductor plate on the surface of the side plate, and the projection of one second pole plate on the surface of the side plate intersects with the projection of the other side of the second conductor plate on the surface of the side plate.

[0010] In some embodiments, the second conductor plate is U-shaped in shape, the second pole plate is U-shaped in shape, the projection of two sides of one second pole plate on the surface of the side plate intersects with the projection of one side of the second conductor plate on the surface of the side plate, and the projection of two sides of one second pole plate on the surface of the side plate intersects with the projection of the other side of the second conductor plate on the surface of the side plate.

[0011] In some embodiments, the base further comprises an end plate connecting the bottom plate and the side plate, a surface of the end plate being perpendicular to the second rotation axis; the conductor plate further comprises a third conductor plate electrically connected to the first conductor plate and the second conductor plate, the third conductor plate being located on a surface of the prism carrier facing the end plate; the prism motor further comprises: at least two third pole plates, the third pole plates being located on a surface of the end plate facing the prism carrier, during the rotation of the prism carrier relative to the base about the second rotation axis, an overlapping area of a footprint of the at least one third pole plate on the end plate and a footprint of the third conductor plate on the end plate increases, and an overlapping area of a footprint of the at least one third pole plate on the end plate and a footprint of the third conductor plate on the end plate decreases.

[0012] In some embodiments, the third pole plate is rectangular, the third conductor plate is rectangular, the footprint of the third conductor plate on the end plate intersects the footprint of the third pole plate on the end plate, and the length directions of the two third pole plates intersect.

[0013] In some embodiments, the third conductor plate is L-shaped, the third pole plate is rectangular, a footprint of one of the third pole plates on the end plate intersects a footprint of one side of the third conductor plate on the end plate, and a footprint of one of the third pole plates on the end plate intersects a footprint of another side of the third conductor plate on the end plate.

[0014] In some embodiments, the third conductor plate is U-shaped, the third pole plate is U-shaped, a footprint of two sides of one of the third pole plates on the end plate intersects a footprint of one side of the third conductor plate on the end plate, and a footprint of two sides of one of the third pole plates on the end plate intersects a footprint of another side of the third conductor plate on the end plate.

[0015] According to some embodiments of the present application, another aspect of the embodiments of the present application further provides a method for detecting the rotation angle of a prism motor, applied to the prism motor of the above embodiments, comprising: rotating the bottom surface of the prism carrier to an initial position parallel to the bottom plate; rotating the prism carrier clockwise with the first rotation axis to a first target angle, and in the process of rotation, obtaining a plurality of first capacitance values between each second pole plate and the first pole plate at a plurality of rotation angles, fitting a first curve diagram 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 with the first rotation axis to a second target angle, and in the process of rotation, obtaining a plurality of second capacitance values between each second pole plate and the first pole plate at a plurality of rotation angles, fitting a second curve diagram with the rotation angle and the corresponding plurality of second capacitance values; combining the first curve diagram and the second curve diagram to obtain a first capacitance angle curve diagram, the first capacitance angle curve diagram representing the relationship between the capacitance value between each second pole plate and the first pole plate when the prism carrier is rotated to different angles with the first rotation axis relative to the base; obtaining a plurality of first real-time capacitances between the first pole plate and each second pole plate; and bringing the plurality of first real-time capacitances into the first capacitance angle curve diagram to obtain the rotation angle of the prism carrier with the first rotation axis relative to the base.

[0016] According to some embodiments of the present application, still another aspect of the embodiments of the present application further provides a camera device, comprising: the prism motor in the above embodiments; a prism, the prism is arranged 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 or the second rotation axis; a lens, the focusing direction of the lens is reverse coincident with the reflected light of the prism; and a photosensitive chip, the photosensitive chip is located on the side of the lens away from the prism, and the photosensitive chip is used for receiving the reflected light passing through the lens.

[0017] The technical solutions provided by the embodiments of the present application have at least the following advantages:

[0018] In the prism motor provided by the embodiments 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 carrier is shaken due to the shaking of the electronic device loaded with the prism motor during the use of the prism motor, the driving assembly in the prism motor can drive the prism carrier to rotate in the opposite direction to offset the displacement caused by the shaking. The bottom plate of the prism motor is provided with a first polar plate, the side plate is provided with a plurality of second polar plates, and the bottom surface and the side surface of the prism carrier are respectively provided with a first conductor plate opposite the first polar plate and a second conductor plate opposite the second polar plate. The first conductor plate and the second conductor plate are electrically connected to each other to form a conductor plate. The first polar plate and the second polar plate are used to be connected with a detection circuit. A group of capacitors (first capacitors) can be formed between the first polar plate and the first conductor plate. A group of capacitors (second capacitors) can be formed between any second polar plate and the second conductor plate. The capacitance value between the first polar plate and the second polar plate is the series capacitance value of the first capacitors and the second capacitors. During the rotation of the prism carrier around the first rotation axis relative to the base, the overlapping area of the normal projection of at least one second polar plate on the side plate and the normal projection of the second conductor plate on the side plate increases, and the overlapping area of the normal projection of at least one second polar plate on the side plate and the normal projection of the second conductor plate on the side plate decreases. During the rotation of the prism carrier around the first rotation axis relative to the base, the change value of the first capacitors is smaller than that of the second capacitors. For series capacitors, the change of the second capacitors is more obvious, and the change of the first capacitors can be ignored. The capacitance change between the first polar plate and the second polar plate can be reflected by the change of the second capacitors. Regardless of whether the prism carrier rotates clockwise or counterclockwise around the first rotation axis relative to the base, at least two groups of capacitance values are corresponded to each rotation angle, and the change trends of the two groups of capacitance values are different. The rotation direction of the prism carrier can be determined according to the change trends. According to the plurality of groups of capacitance values corresponded to different angles, the change relationship between the rotation angle of the prism carrier around the first rotation axis and the plurality of capacitors can be obtained. Then, during the use of the prism motor, the rotation angle of the prism carrier around the first rotation axis can be inversely deduced according to the plurality of capacitance values, so that the position state of the prism carrier can be accurately obtained, and the driving assembly can accurately drive the rotation of the prism carrier to offset the displacement of the shaking, thereby improving the anti-shaking precision. In addition, the conductor plate can not need to be connected with the detection circuit, so that the instability of the detection circuit caused by the shaking of the prism carrier can be avoided, which is beneficial to improving the precision of the capacitance value between the first polar plate and the second polar plate, and then improving the accurate calculation of the rotation angle of the prism carrier, so as to improve the anti-shaking precision. BRIEF DESCRIPTION OF DRAWINGS

[0019] One or more embodiments are illustrated by way of example in the drawings and are described herein in connection with the embodiments presented. The embodiments described herein are not intended to be limited to the exemplary designs described herein, but are to be accorded the full scope of the claims, wherein reference to an embodiment, a figure, etc., is not to be construed as limiting the disclosure to that embodiment or figure. The drawings provided herein are intended to be illustrative in nature and are not intended to be limiting of the scope of the disclosure in any way. As such, the drawings provided herein are exemplary and explanatory only and should not be considered restrictive of the disclosure.

[0020] FIG. 1 is a schematic diagram of an overall structure of a prism motor according to an embodiment of the present application;

[0021] FIG. 2 is a schematic diagram of a first prism motor according to an embodiment of the present application, viewed along a direction perpendicular to a side plate;

[0022] FIG. 3 is a schematic diagram of a second prism motor according to an embodiment of the present application, viewed along a direction perpendicular to a side plate;

[0023] FIG. 4 is a schematic diagram of a third prism motor according to an embodiment of the present application, viewed along a direction perpendicular to a side plate;

[0024] FIG. 5 is a schematic diagram of the first prism motor according to an embodiment of the present application, viewed along a direction perpendicular to an end plate;

[0025] FIG. 6 is a schematic diagram of the second prism motor according to an embodiment of the present application, viewed along a direction perpendicular to an end plate;

[0026] FIG. 7 is a schematic diagram of the third prism motor according to an embodiment of the present application, viewed along a direction perpendicular to an end plate;

[0027] FIG. 8 is a schematic diagram of a state in which two end plates are perpendicular to each other according to an embodiment of the present application;

[0028] FIG. 9 is a schematic diagram of a state in which two end plates intersect and are not perpendicular to each other according to an embodiment of the present application;

[0029] FIG. 10 is a simulation curve of a prism carrier rotating around a first rotation axis when the prism carrier is rotated to different angles with respect to a base with a second rotation axis according to an embodiment of the present application;

[0030] FIG. 11 is a schematic diagram of a camera device according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] As can be seen from the background, the prism motor has a problem of low anti-shake precision.

[0032] The prism motor generally comprises a prism carrier for carrying a prism and a base connected with the prism carrier through elastic sheets to suspend the prism carrier above the base. The prism motor further comprises a first driving assembly and a second driving assembly. The first driving assembly can drive the prism carrier to rotate relative to the base about a first horizontal axis, and the second driving assembly can drive the prism carrier to rotate relative to the base about a second horizontal axis. The intersection of the first horizontal axis and the second horizontal axis is the rotation center of the prism motor. In the use of the prism motor, it is inevitable that the prism carrier cannot be aligned with a lens due to shaking caused by operation problems. The first driving assembly and the second driving assembly can offset the shaking displacement of the prism carrier relative to the base, thereby achieving anti-shake. In the related art, the emitter plate is arranged on the base and the receiver plate is arranged on the prism carrier. When the prism carrier rotates relative to the base, the capacitance between the emitter plate and the receiver plate changes, and the position of the prism carrier is detected according to the change in capacitance. However, the rotation of the prism carrier relative to the base is not simply a change in the area or distance of the plate, so the change in capacitance between the emitter plate and the receiver plate is not a simple linear relationship, which leads to an inaccurate correspondence between a single capacitance change and the position of the prism carrier, and further reduces the anti-shake accuracy of the prism motor.

[0033] The prism motor, the method for detecting the rotation angle of the prism motor and the camera device provided in the embodiments of the present application 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" and the like 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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0035] In this document, the term "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it independent or alternative to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular 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 specified, other components are not excluded, and other components can also be further included.

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

[0039] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present application, many technical details are presented in order to enable the reader to better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0040] FIG. 1 is a schematic diagram of the overall structure of a prism motor according to an embodiment of the present application; FIG. 2 is a schematic diagram of a first prism motor according to an embodiment of the present application along a direction perpendicular to the side plate; FIG. 3 is a schematic diagram of a second prism motor according to an embodiment of the present application along a direction perpendicular to the side plate; and FIG. 4 is a schematic diagram of a third prism motor according to an embodiment of the present application along a direction perpendicular to the side plate. For ease of illustration, the side plate 102 and the second pole plate 302 in FIGS. 2 to 4 are in a transparent state.

[0041] Referring to FIG. 1, according to some embodiments of the present application, the prism motor comprises a base 100 and a prism carrier 200, the base 100 comprises a bottom plate 101 and a side plate 102 which are perpendicular to each other; the prism carrier 200 is arranged above the bottom plate 101, the prism carrier 200 is used to carry a prism, 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, the intersection of the first rotation axis X and the second rotation axis Y is a rotation center O, and the first rotation axis X is perpendicular to the surface of the side plate 102. Referring to FIG. 2, the prism motor further comprises a first polar plate 301, at least two second polar plates 302 and a conductor plate 310, the first polar plate 301 is located on the surface of the bottom plate 101, and the geometric center of the first polar plate 301 is projected on the bottom plate 101 coincides with the projection of the rotation center O on the bottom plate 101; the second polar plate 302 is located on the surface of the side plate 102 facing the prism carrier 200; the conductor plate 310 comprises a first conductor plate 311 and a second conductor plate 312 which are electrically connected to each other, the first conductor plate 311 is located on the bottom surface of the prism carrier 200 and is arranged opposite to the first polar plate 301, the second conductor plate 312 is located on the side surface of the prism carrier 200 and is arranged opposite to the second polar plate 302, the projection of the first conductor plate 311 on the surface of the bottom plate 101 overlaps the projection of the first polar plate 301 on the surface of the bottom plate 101, and during the rotation of the prism carrier 200 relative to the base 100 around the first rotation axis X, the overlapping area of the projection of at least one second polar plate 302 on the side plate 102 and the projection of the second conductor plate 312 on the side plate increases, and the overlapping area of the projection of at least one second polar plate 302 on the side plate 102 and the projection of the second conductor plate 312 on the side plate 102 decreases.

[0042] In the prism motor provided by the embodiment of the present application, the prism carrier 200 can rotate relative to the base 100 around the first rotation axis X or the second rotation axis Y, thereby driving the prism carried on the prism carrier 200 to rotate around the first rotation axis X or the second rotation axis Y. When the prism carrier 200 shakes due to the shaking of the electronic device loaded with the prism motor during the use of the prism motor, the driving assembly in the prism motor can drive the prism carrier 200 to rotate in the opposite direction to offset the displacement caused by the shaking. The bottom plate 101 of the prism motor is provided with a first polar plate 301, the side plate 102 is provided with a plurality of second polar plates 302, and the bottom surface and the side surface of the prism carrier 200 are respectively provided with a first conductor plate 311 opposite to the first polar plate 301 and a second conductor plate 312 opposite to the second polar plate 302, the first conductor plate 311 and the second conductor plate 312 are electrically connected to each other to form a conductor plate 310, the first polar plate 301 and the second polar plate 302 are used to be connected with a detection circuit, a group of capacitors (first capacitors) can be formed between the first polar plate 301 and the first conductor plate 311, a group of capacitors (second capacitors) can be formed between any second polar plate 302 and the second conductor plate 312, and the capacitance value between the first polar plate 301 and the second polar plate 302 is the series capacitance value of the first capacitors and the second capacitors. During the rotation of the prism carrier 200 around the first rotation axis X relative to the base 100, the overlapping area of the normal projection of at least one second polar plate 302 on the side plate 102 and the normal projection of the second conductor plate 312 on the side plate increases, and the overlapping area of the normal projection of at least one second polar plate 302 on the side plate 102 and the normal projection of the second conductor plate 312 on the side plate 102 decreases. During the rotation of the prism carrier 200 around the first rotation axis X relative to the base 100, the change value of the first capacitors is smaller than that of the second capacitors. For the series capacitors, the change of the second capacitors is more obvious, and the change of the first capacitors can be ignored. The capacitance change between the first polar plate 301 and the second polar plate 302 can be reflected by the change of the second capacitors. No matter whether the prism carrier 200 rotates clockwise or counterclockwise around the first rotation axis X relative to the base 100, at least two groups of capacitance values are corresponded to each rotation angle, and the change trends of the two groups of capacitance values are different. The rotation direction of the prism carrier 200 can be judged according to the change trends. The rotation angle of the prism carrier 200 around the first rotation axis X and the change relationship of the plurality of capacitors can be obtained according to the plurality of groups of capacitance values corresponded to different angles. Then, during the use of the prism motor, the rotation angle of the prism carrier 200 around the first rotation axis X can be inversely deduced according to the plurality of capacitance values, so that the position state of the prism carrier 200 can be accurately obtained, and the driving assembly can accurately drive the rotation of the prism carrier 200 to offset the displacement caused by the shaking, thereby improving the anti-shaking precision.In addition, the conductor plate 310 can not need a connection detection circuit, so that the detection circuit is not unstable due to the jitter of the prism carrier 200, which is beneficial to improve the accuracy of the capacitance value obtained between the first electrode plate 301 and the second electrode plate 302, and further improve the accurate calculation of the rotation angle of the prism carrier 200, so as to improve the anti-shake accuracy.

[0043] In FIG. 2, the area of the first electrode plate 301 is less than the area of the first conductor plate 311, so the effective area between the first electrode plate 301 and the first conductor plate 311 is the area of the first electrode plate 301. In some embodiments, the area of the first electrode plate can be greater than the area of the first conductor plate, and the effective area between the first electrode plate and the first conductor plate is the projected area of the first conductor plate. In this way, during the rotation of the prism carrier 200 relative to the first rotation axis X, the effective area between the first electrode plate 301 and the first conductor plate 311 does not change abruptly, thereby avoiding the problem of abrupt change of the capacitance value between the first electrode plate 301 and the second electrode plate 302. Wherein, the effective area refers to the actual area between the two electrode plates that can store electric charge.

[0044] In combination with reference to FIGS. 1 and 2, in some embodiments, the second electrode plate 302 is rectangular in shape, the second conductor plate 312 is rectangular in shape, the orthographic projection of the second conductor plate 312 on the side plate 102 intersects the orthographic projection of the second electrode plate 302 on the side plate 102, and the length directions of the two second electrode plates 302 intersect. In this way, when the prism carrier 200 rotates clockwise around the first rotation axis X, the effective area between the upper second electrode plate 302 and the second conductor plate 312 increases, and the effective area between the lower second electrode plate 302 and the second conductor plate 312 decreases; when the prism carrier 200 rotates counterclockwise around the first rotation axis X, the effective area between the upper second electrode plate 302 and the second conductor plate 312 decreases, and the effective area between the lower second electrode plate 302 and the second conductor plate 312 increases.

[0045] With reference to FIG. 1 and FIG. 3, in some embodiments, the second conductor plate 323 is shaped as an L shape, the second electrode plate 302 is shaped as a rectangle, the orthographic projection of one second electrode plate 302 on the side plate 102 intersects with the orthographic projection of one edge of the second conductor plate 312 on the side plate 102, and the orthographic projection of one second electrode plate 302 on the side plate 102 intersects with the orthographic projection of another edge of the second conductor plate 312 on the side plate 102. In this way, when the prism carrier 200 rotates clockwise around the first rotation axis X, the effective area between the upper second electrode plate 302 and the second conductor plate 312 decreases, and the effective area between the lower second electrode plate 302 and the second conductor plate 312 increases; when the prism carrier 200 rotates counterclockwise around the first rotation axis X, the effective area between the upper second electrode plate 302 and the second conductor plate 312 increases, and the effective area between the lower second electrode plate 302 and the second conductor plate 312 decreases.

[0046] With reference to FIG. 1 and FIG. 4, in some embodiments, the second conductor plate 323 is shaped as a U shape, the second electrode plate 302 is shaped as a U shape, the orthographic projection of two edges of one second electrode plate 302 on the side plate 102 intersects with the orthographic projection of one edge of the second conductor plate 312 on the side plate 102, and the orthographic projection of two edges of one second electrode plate 302 on the side plate 102 intersects with the orthographic projection of another edge of the second conductor plate 312 on the side plate 102. In this way, when the prism carrier 200 rotates clockwise around the first rotation axis X, the effective area between the left second electrode plate 302 and the second conductor plate 312 increases, and the effective area between the right second electrode plate 302 and the second conductor plate 312 decreases; when the prism carrier 200 rotates counterclockwise around the first rotation axis X, the effective area between the left second electrode plate 302 and the second conductor plate 312 decreases, and the effective area between the right second electrode plate 302 and the second conductor plate 312 increases.

[0047] FIG. 5 is a structural schematic diagram of a first prism motor along the direction perpendicular to the end plate according to an embodiment of the present application; FIG. 6 is a structural schematic diagram of a second prism motor along the direction perpendicular to the end plate according to an embodiment of the present application; and FIG. 7 is a structural schematic diagram of a third prism motor along the direction perpendicular to the end plate according to an embodiment of the present application. For ease of illustration, the end plate 103 and the third electrode plate 303 are in a transparent state in FIG. 5 to FIG. 7.

[0048] With reference to FIG. 1 and FIG. 5 to FIG. 7, in some embodiments, the base 100 further comprises an end plate 103 connecting the bottom plate 101 and the side plate 102, a surface of the end plate 103 being perpendicular to the second rotation axis Y; the conductor plate 310 further comprises a third conductor plate 313 electrically connected with the first conductor plate 311 and the second conductor plate 312, the third conductor plate 313 being located on a surface of the prism carrier 200 facing the end plate 103; the prism motor further comprises: at least two third pole plates 303, the third pole plates 303 being located on a surface of the end plate 103 facing the prism carrier 200, during the rotation of the prism carrier 200 relative to the base 100 along the second rotation axis Y, an overlapping area of a normal projection of at least one third pole plate 303 on the end plate 103 and a normal projection of the third conductor plate 313 on the end plate 103 increases, and an overlapping area of the normal projection of the at least one third pole plate 303 on the end plate 103 and the normal projection of the third conductor plate 313 on the end plate 103 decreases.

[0049] Therefore, the first electrode plate 301 and the third electrode plate 303 are used to be connected with the detection circuit, a set of capacitors (first capacitors) can be formed between the first electrode plate 301 and the first conductor plate 311, a set of capacitors (third capacitors) can be formed between any third electrode plate 303 and the third conductor plate 313, and the capacitance value between the first electrode plate 301 and the third electrode plate 303 is the series capacitance value of the first capacitors and the third capacitors. During the rotation of the prism carrier 200 relative to the base 100 about the second rotation axis Y, the overlapping area of the orthographic projection of at least one third electrode plate 303 on the end plate 103 and the orthographic projection of the third conductor plate 313 on the end plate 103 increases, and the overlapping area of the orthographic projection of at least one third electrode plate 303 on the end plate 103 and the orthographic projection of the third conductor plate 313 on the end plate 103 decreases. During the rotation of the prism carrier 200 relative to the base 100 about the second rotation axis Y, the change value of the first capacitors is smaller than that of the third capacitors. For the series capacitors, the change of the third capacitors is more obvious, and the change of the first capacitors can be ignored. The capacitance change between the first electrode plate 301 and the third electrode plate 303 can be reflected by the change of the third capacitors. No matter the prism carrier 200 rotates clockwise or counterclockwise about the second rotation axis Y, at least two sets of capacitance values are corresponded to each rotation angle, and the change trends of the two sets of capacitance values are different. According to the change trends, the rotation direction of the prism carrier 200 can be determined. According to the multiple sets of capacitance values corresponded to different angles, the rotation angle of the prism carrier 200 about the second rotation axis Y and the change relationship of the multiple capacitors can be obtained. Then, during the use of the prism motor, the rotation angle of the prism carrier 200 about the second rotation axis Y can be inversely deduced according to the corresponding multiple capacitance values. In this way, the position state of the prism carrier 200 can be accurately obtained, and the driving assembly can accurately drive the rotation of the prism carrier 200 to offset the displacement caused by the shaking, thereby improving the anti-shaking precision. In combination with the rotation position of the prism carrier 200 about the first rotation axis X obtained by the first electrode plate 301 and the second electrode plate 302, the rotation state of the prism carrier 200 in the two-axis direction can be obtained, so as to realize the two-axis anti-shaking of the prism motor. In addition, since the conductor plate 310 can not need to be connected with the detection circuit, the detection circuit will not be unstable due to the shaking of the prism carrier 200, which is beneficial to improve the precision of the capacitance value between the first electrode plate 301 and the third electrode plate 303, and then improve the accurate calculation of the rotation angle of the prism carrier 200, so as to improve the anti-shaking precision.

[0050] With reference to FIGS. 1 and 5, in some embodiments, the third electrode plate 303 has a rectangular shape, the third conductor plate 313 has a rectangular shape, the orthogonal projection of the third conductor plate 313 on the end plate 103 intersects the orthogonal projection of the third electrode plate 303 on the end plate 103, and the length directions of the two third electrode plates 303 intersect. In this way, when the prism carrier 200 rotates clockwise around the second rotation axis Y, the effective area between the third electrode plate 303 above and the third conductor plate 313 increases, and the effective area between the third electrode plate 303 below and the third conductor plate 313 decreases; when the prism carrier 200 rotates counterclockwise around the second rotation axis Y, the effective area between the third electrode plate 303 above and the third conductor plate 313 decreases, and the effective area between the third electrode plate 303 below and the third conductor plate 313 increases.

[0051] With reference to FIGS. 1 and 6, in some embodiments, the third conductor plate 313 has an L-shaped structure, the third electrode plate 303 has a rectangular shape, the orthogonal projection of one third electrode plate 303 on the end plate 103 intersects the orthogonal projection of one side of the third conductor plate 313 on the end plate 103, and the orthogonal projection of the other third electrode plate 303 on the end plate 103 intersects the orthogonal projection of the other side of the third conductor plate 313 on the end plate 103. In this way, when the prism carrier 200 rotates clockwise around the second rotation axis Y, the effective area between the third electrode plate 303 above and the third conductor plate 313 decreases, and the effective area between the third electrode plate 303 below and the third conductor plate 313 increases; when the prism carrier 200 rotates counterclockwise around the second rotation axis Y, the effective area between the third electrode plate 303 above and the third conductor plate 313 increases, and the effective area between the third electrode plate 303 below and the third conductor plate 313 decreases.

[0052] With reference to FIGS. 1 and 7, in some embodiments, the third conductor plate 313 has a U-shaped structure, the third electrode plate 303 has a U-shaped structure, the orthogonal projection of one third electrode plate 303 on the end plate 103 intersects the orthogonal projection of one side of the third conductor plate 313 on the end plate 103, and the orthogonal projection of the other third electrode plate 303 on the end plate 103 intersects the orthogonal projection of the other side of the third conductor plate 313 on the end plate 103. In this way, when the prism carrier 200 rotates clockwise around the second rotation axis Y, the effective area between the third electrode plate 303 on the left and the third conductor plate 313 increases, and the effective area between the third electrode plate 303 on the right and the third conductor plate 313 decreases; when the prism carrier 200 rotates counterclockwise around the second rotation axis Y, the effective area between the third electrode plate 303 on the left and the third conductor plate 313 decreases, and the effective area between the third electrode plate 303 on the right and the third conductor plate 313 increases.

[0053] In the prism motor provided by the embodiment of the present application, the prism carrier 200 can rotate relative to the base 100 around the first rotation axis X or the second rotation axis Y, thereby driving the prism carried on the prism carrier 200 to rotate around the first rotation axis X or the second rotation axis Y. When the prism carrier 200 shakes due to the shaking of the electronic device loaded with the prism motor during the use of the prism motor, the driving assembly in the prism motor can drive the prism carrier 200 to rotate in the opposite direction to offset the displacement caused by the shaking. The bottom plate 101 of the prism motor is provided with a first polar plate 301, the side plate 102 is provided with a plurality of second polar plates 302, and the bottom surface and the side surface of the prism carrier 200 are respectively provided with a first conductor plate 311 opposite to the first polar plate 301 and a second conductor plate 312 opposite to the second polar plate 302, the first conductor plate 311 and the second conductor plate 312 are electrically connected to each other to form a conductor plate 310, the first polar plate 301 and the second polar plate 302 are used to be connected with a detection circuit, a group of capacitors (first capacitors) can be formed between the first polar plate 301 and the first conductor plate 311, a group of capacitors (second capacitors) can be formed between any second polar plate 302 and the second conductor plate 312, and the capacitance value between the first polar plate 301 and the second polar plate 302 is the series capacitance value of the first capacitors and the second capacitors. During the rotation of the prism carrier 200 around the first rotation axis X relative to the base 100, the overlapping area of the normal projection of at least one second polar plate 302 on the side plate 102 and the normal projection of the second conductor plate 312 on the side plate increases, and the overlapping area of the normal projection of at least one second polar plate 302 on the side plate 102 and the normal projection of the second conductor plate 312 on the side plate 102 decreases. During the rotation of the prism carrier 200 around the first rotation axis X relative to the base 100, the change value of the first capacitors is smaller than that of the second capacitors. For the series capacitors, the change of the second capacitors is more obvious, and the change of the first capacitors can be ignored. The capacitance change between the first polar plate 301 and the second polar plate 302 can be reflected by the change of the second capacitors. No matter whether the prism carrier 200 rotates clockwise or counterclockwise around the first rotation axis X relative to the base 100, at least two groups of capacitance values are corresponded to each rotation angle, and the change trends of the two groups of capacitance values are different. The rotation direction of the prism carrier 200 can be judged according to the change trends. The rotation angle of the prism carrier 200 around the first rotation axis X and the change relationship of the plurality of capacitors can be obtained according to the plurality of groups of capacitance values corresponded to different angles. Then, during the use of the prism motor, the rotation angle of the prism carrier 200 around the first rotation axis X can be inversely deduced according to the plurality of capacitance values, so that the position state of the prism carrier 200 can be accurately obtained, and the driving assembly can accurately drive the rotation of the prism carrier 200 to offset the displacement caused by the shaking, thereby improving the anti-shaking precision.In addition, the conductor plate 310 can not need a connection detection circuit, so that the detection circuit is not unstable due to the jitter of the prism carrier 200, and the accuracy of the capacitance value obtained between the first electrode plate 301 and the second electrode plate 302 is improved, and the accurate calculation of the rotation angle of the prism carrier 200 is improved, so as to improve the anti-shake accuracy.

[0054] 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. The same or corresponding parts as the previous embodiment can refer to the corresponding description of the previous embodiment, and will not be described in detail below.

[0055] The rotation angle detection method of the prism motor comprises the following steps: rotating the bottom surface of the prism carrier to an initial position parallel to the bottom plate; rotating the prism carrier clockwise around the first rotation axis to a first target angle, and in 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, fitting a first curve diagram 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 in the rotation process, obtaining a plurality of second capacitance values between each second electrode plate and the first electrode plate at a plurality of rotation angles, fitting a second curve diagram with the rotation angle and the corresponding plurality of second capacitance values; combining the first curve diagram and the second curve diagram to obtain a first capacitance angle curve diagram, which represents the relationship between the capacitance value between each second electrode plate and the first electrode plate when the prism carrier is rotated to different angles around the first rotation axis relative to the base; obtaining a plurality of first real-time capacitances between the first electrode plate and each second electrode plate; and inputting the plurality of first real-time capacitances into the first capacitance angle curve diagram to obtain the rotation angle of the prism carrier around the first rotation axis relative to the base.

[0056] FIG. 8 is a structural schematic diagram of a state in which two electrode plates are perpendicular to each other according to an embodiment of the present application; and FIG. 9 is a structural schematic diagram of a state in which two electrode plates intersect and are not perpendicular according to an embodiment of the present application.

[0057] With reference to FIGS. 8 and 9, the overlapping part between the two electrode plates shown in FIG. 9 is a parallelogram, the height of the parallelogram is W, and the bottom is L / cos(a), so the overlapping area is L·W / cos(a). Therefore, when the included angle between the two electrode plates is less than 90°, the larger the included angle a is, the larger the overlapping area is. Based on the above change relationship, the change relationship between the opposite area of the second electrode plate and the second conductor plate and the change relationship between the capacitance values between the first electrode plate and the second electrode plate can be calculated, and then the relative rotation angle between the second electrode plate and the second conductor plate, i.e., the angle of the prism carrier around the first rotation axis relative to the base, is obtained.

[0058] In some embodiments, when the prism motor further comprises a third electrode plate and a third conductor plate, the method for detecting the rotation angle of the prism motor further comprises: rotating the prism carrier to an initial position; rotating the prism carrier clockwise to a third target angle along the second rotation axis, and during the rotation, acquiring a plurality of third capacitance values between each third electrode plate and the first electrode plate at a plurality of rotation angles, fitting a third curve graph of the rotation angle and the corresponding plurality of third capacitance values; rotating the prism carrier to the initial position; rotating the prism carrier counterclockwise to a fourth target angle along the second rotation axis, and during the rotation, acquiring a plurality of fourth capacitance values between each third electrode plate and the first electrode plate at a plurality of rotation angles, fitting a fourth curve graph of the rotation angle and the corresponding plurality of fourth capacitance values; combining the third curve graph and the fourth curve graph to obtain a second capacitance angle curve graph, which represents the relationship between the capacitance value between each third electrode plate and the first electrode plate when the prism carrier is rotated to different angles along the second rotation axis relative to the base; acquiring a plurality of first real-time capacitances between the first electrode plate and each second electrode plate and a plurality of second real-time capacitances between the first electrode plate and each third electrode plate; inputting the plurality of first real-time capacitances into the first capacitance angle curve graph and inputting the plurality of second real-time capacitances into the second capacitance angle curve graph to obtain the rotation angle of the prism carrier relative to the base along the first rotation axis and the second rotation axis.

[0059] FIG. 10 is a simulation curve of the prism carrier rotating around the first rotation axis when the prism carrier is rotated to different angles along the second rotation axis relative to the base according to an embodiment of the present application.

[0060] For example, when the prism carrier is rotated to 0°, 0.5°, 1°, -0.5° and 1° along the second rotation axis relative to the base, respectively, the prism carrier is rotated along the first rotation axis relative to the base, and the capacitance values between the first electrode plate and the second electrode plate and the capacitance values between the first electrode plate and the third electrode plate are acquired at different rotation angles. Due to symmetry, the capacitance signals detected by rotating along the first rotation axis and the signals by rotating along the second rotation axis will be shifted, and through decoupling processing, the rotation angles of the prism carrier relative to the base around the first rotation axis and the second rotation axis, respectively, can be obtained.

[0061] Correspondingly, the present application further provides a camera device, which comprises the prism motor as described in the above embodiments, and can accurately acquire the position state of the prism carrier, so that the driving assembly can accurately drive the rotation of the prism carrier according to the corresponding position state to offset the displacement of the shake, thereby improving the anti-shake precision. The same or corresponding parts as the previous embodiments can refer to the corresponding descriptions of the previous embodiments, which will not be described in detail below.

[0062] FIG. 11 is a structural schematic diagram of a camera device according to an embodiment of the present application. For the convenience of description, only the reflecting surface 211 of the prism 201 is shown in FIG. 11.

[0063] With reference to FIGS. 1-11, the camera device comprises a prism motor as in the above embodiments, a prism 201 disposed on the prism carrier 200, the incident light direction of the prism 201 (i.e. the direction parallel to the Z axis) being perpendicular to the surface of the base plate 101, and the reflected light direction of the prism 201 being parallel to the first rotation axis X, a lens 401, the focusing direction of the lens 401 being reverse coincident with the reflected light direction of the prism 201, and a photosensitive chip 402, the photosensitive chip 402 being located on the side of the lens 401 away from the prism 201, and the photosensitive chip 402 being configured to receive the reflected light passing through the lens 401.

[0064] In some embodiments, the camera assembly can further comprise a light-transmitting sheet 403, the incident light passing through the light-transmitting sheet 403 to irradiate on the prism 201.

[0065] It is understood by those skilled in the art that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application. Any person skilled in the art can make various modifications and changes without departing from the spirit and scope of the present application, and therefore the protection scope of the present application should be limited by the scope defined in the claims.

Claims

A prism motor characterized by The application relates to a prism array device, comprising: a base, the base comprising a bottom plate and a side plate which are perpendicular to each other; a prism carrier arranged above the bottom plate, the prism carrier being used for carrying prisms, the prism carrier being rotatable relative to the base about a first rotation axis and a second rotation axis, the first rotation axis and the second rotation axis both being parallel to the surface of the bottom plate, the intersection of the first rotation axis and the second rotation axis being a rotation center, the first rotation axis being perpendicular to the surface of the side plate; a first electrode plate located on the surface of the bottom plate, the geometric center of the first electrode plate being coincident with the projection of the rotation center on the bottom plate; at least two second electrode plates located on the surface of the side plate facing the prism carrier; a conductor plate comprising a first conductor plate and a second conductor plate which are electrically connected to each other, the first conductor plate being located on the bottom surface of the prism carrier and being arranged opposite to the first electrode plate, the second conductor plate being located on the side surface of the prism carrier and being arranged opposite to the second electrode plate, the projection of the first conductor plate on the surface of the bottom plate being overlapped with the projection of the first electrode plate on the surface of the bottom plate, the projection of at least one second electrode plate on the surface of the side plate being overlapped with the projection of the second conductor plate on the surface of the side plate in an increasing manner during the rotation of the prism carrier about the first rotation axis relative to the base, and the projection of at least one second electrode plate on the surface of the side plate being overlapped with the projection of the second conductor plate on the surface of the side plate in a decreasing manner. The prism motor according to claim 1, wherein The second electrode plate is in the shape of a rectangle, the second conductor plate is in the shape of a rectangle, the projection of the second conductor plate on the surface of the side plate intersects with the projection of the second electrode plate on the surface of the side plate, and the length directions of the two second electrode plates intersect with each other. The prism motor according to claim 1, wherein The second conductor plate is in the shape of an L, the second electrode plate is in the shape of a rectangle, the projection of one second electrode plate on the surface of the side plate intersects with the projection of one side of the second conductor plate on the surface of the side plate, and the projection of one second electrode plate on the surface of the side plate intersects with the projection of the other side of the second conductor plate on the surface of the side plate. The prism motor according to claim 1, wherein The second conductor plate is in the shape of a U, the second electrode plate is in the shape of a U, the projection of two sides of one second electrode plate on the surface of the side plate intersects with the projection of one side of the second conductor plate on the surface of the side plate, and the projection of two sides of one second electrode plate on the surface of the side plate intersects with the projection of the other side of the second conductor plate on the surface of the side plate. The prism motor according to claim 1, wherein The base further comprises an end plate, the end plate being connected to the bottom plate and the side plate, the surface of the end plate being perpendicular to the second rotation axis; the conductor plate further comprises a third conductor plate which is electrically connected to the first conductor plate and the second conductor plate, the third conductor plate being located on the surface of the prism carrier facing the end plate. The prism motor further comprises: at least two third pole plates, the third pole plates are located on the surface of the end plate towards the prism carrier, during the rotation of the prism carrier with the second rotation axis relative to the base, the overlapping area of the orthographic projection of at least one third pole plate on the end plate and the orthographic projection of the third conductor plate on the end plate increases, the overlapping area of the orthographic projection of at least one third pole plate on the end plate and the orthographic projection of the third conductor plate on the end plate decreases. The prism motor according to claim 5, wherein The third pole plate is in the shape of a rectangle, the third conductor plate is in the shape of a rectangle, the orthographic projection of the third conductor plate on the end plate intersects with the orthographic projection of the third pole plate on the end plate, and the length direction of the two third pole plates intersects. The prism motor according to claim 5, wherein The third conductor plate is in the shape of an L, the third pole plate is in the shape of a rectangle, the orthographic projection of one third pole plate on the end plate intersects with the orthographic projection of one side of the third conductor plate on the end plate, and the orthographic projection of one third pole plate on the end plate intersects with the orthographic projection of the other side of the third conductor plate on the end plate. The prism motor according to claim 5, wherein The third conductor plate is in the shape of a U, the third pole plate is in the shape of a U, the orthographic projection of two sides of one third pole plate on the end plate intersects with the orthographic projection of one side of the third conductor plate on the end plate, and the orthographic projection of two sides of one third pole plate on the end plate intersects with the orthographic projection of the other side of the third conductor plate on the end plate. A method of detecting a rotation angle of a prism motor, applied to the prism motor according to any one of claims 1 to 8, characterized in that, The method comprises: rotating the bottom surface of the prism carrier to an initial position parallel to the bottom plate; rotating the prism carrier clockwise with the first rotation axis to a first target angle, and during the rotation, obtaining a plurality of first capacitance values between each second pole plate and the first pole plate at a plurality of rotation angles, fitting a first curve diagram of the rotation angle and the corresponding plurality of first capacitance values; rotating the prism carrier to the initial position; rotating the prism carrier counterclockwise with the first rotation axis to a second target angle, and during the rotation, obtaining a plurality of second capacitance values between each second pole plate and the first pole plate at a plurality of rotation angles, fitting a second curve diagram of the rotation angle and the corresponding plurality of second capacitance values; combining the first curve diagram and the second curve diagram to obtain a first capacitance angle curve diagram, the first capacitance angle curve diagram representing the relationship between the capacitance value between each second pole plate and the first pole plate when the prism carrier is rotated to different angles with the first rotation axis relative to the base; obtaining a plurality of first real-time capacitances between the first pole plate and each second pole plate; bringing the plurality of first real-time capacitances into the first capacitance angle curve diagram to obtain the rotation angle of the prism carrier with the first rotation axis relative to the base. A video camera device characterized by comprising: The method comprises: the prism motor according to any one of claims 1-8; a prism, the prism is arranged 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 or the second rotation axis. A lens, a focusing direction of the lens is reverse coincident with the reflected light of the prism; A photosensitive chip, the photosensitive chip is located on a side of the lens away from the prism, and the photosensitive chip is used for receiving the reflected light passing through the lens.

Images