Driving device and imaging device

Abstract

The present disclosure provides a driving device and an imaging device, which are applied to the technical field of terminals. The driving device comprises: a first component, the first component is provided with a first magnet, a second magnet and a third magnet which are relatively fixed, and the first magnet and the third magnet face each other; a second component, the first component can move relative to the second component, and the second component is provided with a target piece which can release magnetism to make the magnets move; a first detection piece, which is arranged on the second component and can detect the change of magnetism, the distance between the first detection piece and the first magnet is a first distance, and the distance between the first detection piece and the second magnet is a second distance; a second detection piece, which is arranged on the second component and can detect the change of magnetism, the distance between the second detection piece and the first magnet is a third distance, and the distance between the second detection piece and the second magnet is a fourth distance; and the distance between the third magnet and the second detection piece is a fifth distance.

Description

Technical Field

[0001] This disclosure relates to the field of terminal technology, and in particular to a driving device and an imaging device. Background Technology

[0002] Drive mechanisms are widely used in scenarios requiring precise control of relative motion. In related technologies, position detection is typically achieved by combining a magnet with a detection element; however, the detection accuracy is easily affected by the magnet's placement and the detection element's position, leading to poor signal consistency and insufficient reliability of motion control. Summary of the Invention

[0003] In view of this, the present disclosure provides a driving device and an imaging device.

[0004] According to a first aspect of this disclosure, a driving device is provided, comprising: a first component having a first magnet, a second magnet, and a third magnet fixed relative to each other, the first magnet and the third magnet facing each other; a second component having the first component movable relative to itself, the second component having a target component capable of releasing magnetism to move the magnets; a first detection component disposed on the second component, capable of detecting changes in magnetism, the first detection component being at a first distance from the first magnet and at a second distance from the second magnet; a second detection component disposed on the second component, capable of detecting changes in magnetism, the second detection component being at a third distance from the first magnet and at a fourth distance from the second magnet, the third distance being the same as the second distance and the fourth distance being the same as the first distance; and a fifth distance from the third magnet to the second detection component, the fifth distance being greater than the third distance.

[0005] According to embodiments of this disclosure, the first distance, second distance, third distance, fourth distance, and fifth distance all characterize the spacing between the corresponding magnet and the corresponding detection element; the spacing can be taken in any of the following ways: the distance between the geometric center of the corresponding detection element and the geometric center of the corresponding magnet; the distance between the center point of the surface of the corresponding detection element facing the corresponding magnet and the center point of the surface of the corresponding magnet facing the corresponding detection element; the distance between the geometric center point of the corresponding magnet and the sensing center point of the corresponding detection element; the distance between the two closest points of the corresponding magnet and the corresponding detection element in space.

[0006] According to embodiments of this disclosure, the size of the third magnet is smaller than the size of the first magnet, and / or the size of the third magnet is smaller than the size of the second magnet.

[0007] According to embodiments of this disclosure, the first component is capable of moving clockwise or counterclockwise relative to the second component; the driving device includes a third detection element disposed on the second component, and the driving device includes a first state and a second state. In the first state, the first component is located at a first position relative to the second component, and in the second state, the first component is located at a second position relative to the second component. In the first state, the magnetic quantity that the first detection element can detect is a first value, the magnetic quantity that the second detection element can detect is a second value, and the magnetic quantity that the third detection element can detect is a third value, wherein the first value is the same as the second value and the third value is different from the first value. In the second state, the magnetic quantity that the first detection element can detect is a fourth value, the magnetic quantity that the second detection element can detect is a fifth value, and the magnetic quantity that the third detection element can detect is a sixth value, wherein the fourth value is the same as the fifth value and the sixth value is different from the fifth value.

[0008] According to embodiments of this disclosure, the difference between the first value and the fourth value is the first difference, the difference between the second value and the fifth value is the second difference, the difference between the third value and the sixth value is the third difference, the first difference is the same as the second difference, and the third difference is different from the first difference.

[0009] According to embodiments of this disclosure, the target component includes a first driving component, a second driving component, and a third driving component capable of releasing magnetism. The first driving component releases magnetism to affect a first magnet, the second driving component releases magnetism to affect a second magnet, and the third driving component releases magnetism to affect a third magnet. The size of the third driving component is smaller than the size of the first driving component, and / or the size of the third driving component is smaller than the size of the second driving component.

[0010] According to an embodiment of this disclosure, the driving device includes a third state in which the first driving member and the second driving member jointly release a first magnetism, which can drive the first magnet and the second magnet to move along a first direction; the third driving member releases a second magnetism, which can drive the third magnet to move along a second direction, which is opposite to the first direction.

[0011] According to embodiments of this disclosure, it further includes at least one of the following: the second driving member and the third driving member can provide different maximum magnetic forces; the second driving member and the first driving member can provide the same maximum magnetic force; the orientations of the first magnet and the second magnet satisfy a perpendicular condition; the orientations of the first magnet and the third magnet satisfy an opposite condition; the orientations of the second magnet and the third magnet satisfy a perpendicular condition; the orientations of the first driving member and the second driving member satisfy a perpendicular condition; the orientations of the first driving member and the third driving member satisfy a perpendicular condition; the orientations of the second driving member and the third driving member satisfy an opposite condition.

[0012] According to a second aspect of this disclosure, an imaging apparatus is provided, comprising: a driving device, including: a first component, the first component having a first magnet, a second magnet, and a third magnet fixed relative to each other, the first magnet and the third magnet facing each other; a second component, the first component being movable relative to the second component, the second component having a target component, the target component being capable of releasing magnetism to cause the magnets to move; a first detection component, disposed on the second component, the first detection component being capable of detecting magnetic changes, the first detection component being at a first distance from the first magnet, and the first detection component being at a second distance from the second magnet; a second detection component, disposed on the second component, the second detection component being capable of detecting magnetic changes, the second detection component being at a third distance from the first magnet, and the second detection component being at a fourth distance, the third distance being the same as the second distance, and the fourth distance being the same as the first distance; a third magnet being at a fifth distance from the second detection component, the fifth distance being greater than the third distance; and an imaging component, the imaging component being fixed relative to the first component, or the imaging component being fixed relative to the second component.

[0013] According to embodiments of this disclosure, a third component is included, with the first component nested within the third component; a fourth driving member is disposed within the third component; and a fourth magnet is disposed within the first component. The fourth driving member is capable of releasing magnetism to act on the fourth magnet, enabling the first component to extend and retract relative to the third component.

[0014] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0015] The above and other objects, features and advantages of this disclosure will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0016] Figure 1A This schematic diagram illustrates one of the structural schematics of a drive device in the related art;

[0017] Figure 1B This is a schematic diagram of the structure of a drive device in the related art;

[0018] Figure 1C The third schematic diagram illustrates the structure of a drive device in the related technology;

[0019] Figure 1D The fourth schematic diagram illustrates the structure of a drive device in the related art;

[0020] Figure 2 A schematic diagram of one of the structural schematics of a drive device according to an embodiment of the present disclosure is shown;

[0021] Figure 3 A second schematic diagram of the structure of a drive device according to an embodiment of the present disclosure is shown.

[0022] Figure 4 A schematic diagram of the structure of a drive device according to an embodiment of the present disclosure is shown in Figure 3.

[0023] Figure 5 A schematic diagram of the structure of an imaging apparatus according to an embodiment of the present disclosure is shown.

[0024] Figure 6 A schematic cross-sectional view of an imaging apparatus according to an embodiment of the present disclosure is shown.

[0025] Reference numerals: 1. Imaging device;

[0026] 10. Drive device; 11. First component; 12. First magnet; 13. Second magnet; 14. Third magnet; 15. Second component; 16. Target component; 161. First drive component; 162. Second drive component; 163. Third drive component; 17. First detection component; 18. Second detection component; 19. Third detection component;

[0027] 20. Imaging component; 30. Third component; 40. Fourth driving component; 50. Fourth magnet; 60. Fourth detection component. Detailed Implementation

[0028] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0029] In the embodiments disclosed herein, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0030] Furthermore, in the embodiments of this disclosure, directional terms such as "up," "down," "left," and "right" are defined relative to the orientation in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation in which the components are placed in the accompanying drawings.

[0031] In the embodiments disclosed herein, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0033] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0034] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0035] This disclosure provides a driving device and an imaging device. Before introducing the technical solutions provided by this disclosure, the relevant technologies involved in this disclosure will be described first.

[0036] Drive mechanisms are widely used in scenarios requiring precise control of relative motion. In related technologies, position detection is typically achieved by combining a magnet with a detection element; however, the detection accuracy is easily affected by the magnet's placement and the detection element's position, leading to poor signal consistency and insufficient reliability of motion control.

[0037] In one example, refer to Figure 1ACurrently, voice coil motors for camera autofocus and optical image stabilization primarily employ three support and guiding structures: ball bearings, suspension wires, and spring plates. The commonly used ball bearing solution employs a double-layer ball bearing and ball groove structure, respectively providing constraint and motion guidance for optical image stabilization in the X and Y directions. However, some related technologies also include designs without guide ball grooves. While the balls move within the grooves and are controlled in both directions by a driver chip, the lack of limiting and directional constraints can easily lead to uncontrollable motion trajectories, affecting the accuracy and reliability of image stabilization. For example, refer to... Figure 1B The driver chip is responsible for sensing magnetic signals and energizing the coil. Once energized, the coil acts as an equivalent magnet, driving the OISXY mover (containing a magnet). However, because there is no guide groove, the trade-off is that the same mover passing through different positions may output the same magnitude of magnetic signal to the driver chip, leading to misjudgment. The direct impact is on lens rotation and unstable image stabilization. To solve the above problems, refer to... Figure 1C By adjusting the magnetic pole direction of the magnet, using different coil designs, and adding an extra drive chip along the Y-axis, instability in the image can be detected and resisted. However, during application and debugging, image instability still occurs in a few isolated scenarios. (Refer to...) Figure 1D X and Y represent the optical image stabilization's trajectory in the X and Y directions, respectively. Through testing and analysis, it was determined that the jitter occurred during testing accompanied by a change in direction along the Y / X axes. During this change in direction, the dual-coil equivalent magnet causes superimposed interference to the magnetic induction of the adjacent driver chip (refer to...). Figure 1C When the coil current changes, the equivalent magnetic field strength also changes, and the instantaneous impact is greatest when the coil undergoes a change of direction.

[0038] For ease of description, the optical axis direction of the lens is defined as the Z direction, and the two directions perpendicular to the optical axis are the X direction and the Y direction, with the X direction perpendicular to the Y direction. The first and third sides of the first component are parallel to the X direction, and the third and fourth sides of the first component are parallel to the Y direction. In this embodiment, the optical axis direction is the direction in which the optical system transmits light.

[0039] The following will be through Figure 2 The driving device of the disclosed embodiments will be described in detail.

[0040] Figure 2 One of the schematic diagrams of the structure of a drive device according to an embodiment of the present disclosure is shown.

[0041] like Figure 2 As shown, the driving device 10 in this embodiment includes: a first component 11, a second component 15, a first detection element 17, and a second detection element 18.

[0042] The first component 11 is provided with a first magnet 12, a second magnet 13 and a third magnet 14 that are relatively fixed, with the first magnet 12 and the third magnet 14 facing each other.

[0043] The second component 15 is movable relative to the first component 11. The second component 15 is provided with a target component 16, which can release magnetism to make the magnet move.

[0044] The first detection element 17 is disposed on the second component 15. The first detection element 17 can detect magnetic changes. The distance between the first detection element 17 and the first magnet 12 is the first distance, and the distance between the first detection element 17 and the second magnet 13 is the second distance.

[0045] The second detection element 18 is disposed on the second component 15. The second detection element 18 can detect magnetic changes. The distance between the second detection element 18 and the first magnet 12 is the third distance, and the distance between the second detection element 18 and the second magnet 13 is the fourth distance. The third distance is the same as the second distance, and the fourth distance is the same as the first distance.

[0046] The distance between the third magnet 14 and the second detection element 18 is the fifth distance, which is greater than the third distance.

[0047] For example, the first component 11 can be a moving component in the drive device 10 that can move relative to the second component 15. For instance, the drive device 10 can be a drive mechanism for optical image stabilization (OIS) applied in a camera module, and the first component 11 can be a mover, such as a carrier for mounting a lens, an image stabilization bracket, etc. The drive device 10 can also be a prism drive mechanism applied in a periscope camera module, and the first component 11 can be a prism bracket used to drive the prism to rotate and adjust the light path. However, this application does not specifically limit the type of drive device; that is, those skilled in the art can set and adjust its type according to actual conditions.

[0048] The first magnet 12, the second magnet 13, and the third magnet 14 can be permanent magnets, electromagnets, soft magnets, etc. All three magnets are mounted on the first component 11 and move synchronously with it, maintaining a constant relative position. The first magnet 12 and the third magnet 14 face each other. For example, the first magnet 12 and the third magnet 14 are arranged on the first component 11 in a relatively opposite orientation. For instance, the first magnet 12 can be located on the first side (X direction) of the first component 11, and the third magnet 14 can be located on the second side (Y direction) of the first component 11. The first and second sides can be opposite sides of the first component 11, meaning they are parallel to each other. The second magnet 13 can be located on the third side (X direction) of the first component 11, positioned between the first magnet 12 and the third magnet 14, with the third side of the first component 11 perpendicular to the second side. For example, the first magnet 12 can be disposed on the third side (Y direction) of the first component 11, and the third magnet 14 can be disposed on the fourth side (Y direction) of the first component 11. The third and fourth sides can be opposite sides of the first component 11, that is, the third and fourth sides are parallel to each other. The second magnet 13 can be disposed on the first side (X direction) of the first component 11. The second magnet 13 can be located between the first magnet 12 and the third magnet 14, and the third side of the first component 11 is perpendicular to the second side of the first component 11.

[0049] The second component 15 may be a reference component that is stationary relative to the first component 11 in the drive unit 10. For example, the drive unit 10 may be a drive mechanism for optical image stabilization (OIS) applied in a camera module, and the second component 15 may be a stator, such as a base, housing, etc.

[0050] The target component 16 can generate or change its magnetic field when excited by a control signal, thereby applying an Ampere force or Lorentz force to the magnet on the first component 11 and driving the first component 11 to move. For example, the target component 16 can be an electromagnetic coil; the target component 16 can also be a soft magnetic material that can be magnetized. When the target component 16 is energized or excited by an external signal, it generates magnetism, thereby generating magnetic attraction or repulsion with the first magnet 12, the second magnet 13, or the third magnet 14 on the first component 11, thereby driving the first component 11 to move relative to the second component 15. For example, taking the drive device 10 as the drive mechanism for optical image stabilization (OIS) in the camera module, the first component 11 as the carrier for mounting the lens, the second component 15 as the base, and the target component 16 as the electromagnetic coil, when the electromagnetic coil of the second component 15 is energized, an electromagnetic force is generated between the electromagnetic coil and the first magnet 12, the second magnet 13, and the third magnet 14 on the first component 11, so as to drive the lens to move in a plane perpendicular to the optical axis of the lens, so as to realize the relative movement between the lens and the base.

[0051] Here, the target component 16 can be a single unit, for example, a single coil that corresponds to the first magnet 12, the second magnet 13, and the third magnet 14. By energizing the coil, a magnetic attraction or repulsion force is generated with the first magnet 12, the second magnet 13, or the third magnet 14, thereby driving the first component 11 to move relative to the second component 15 in the X direction, in the Y direction, and rotate in a plane perpendicular to the optical axis. The target component 16 can also be a discrete structure, for example, three coils: the first coil corresponds to the first magnet 12, the second coil corresponds to the second magnet 13, and the third coil corresponds to the third magnet 14. Energizing the first coil generates an electromagnetic force between it and the first magnet 12 to drive the first component 11 to move in the X direction; energizing the second coil generates an electromagnetic force between it and the second magnet 13 to drive the first component 11 to move in the Y direction; simultaneously energizing both the first and second coils drives the first component 11 to rotate in a plane perpendicular to the optical axis.

[0052] The detection element can be a magnetic sensor used to sense changes in the strength of the surrounding magnetic field. The detection element can be a Hall element, a magnetoresistive sensor, etc. For example, the first detection element 17 can be a first Hall sensor. The first detection element 17 can be a detection element positioned opposite to the first magnet 12, that is, the first detection element 17 is positioned in the second component 15 opposite to the first magnet 12 of the first component 11. The second detection element 18 can be a detection element positioned opposite to the second magnet 13, that is, the second detection element 18 is positioned in the second component 15 opposite to the second magnet 13 of the first component 11. For example, the first Hall sensor is welded and fixed to the bottom circuit board of the base (second component 15) near the side of the first magnet 12, and the second Hall sensor is welded and fixed to the bottom circuit board of the base (second component 15) near the side of the second magnet 13. When the lens is in the initial position, the first distance d1 between the first Hall sensor and the first magnet 12 is 0.5 mm, and the second distance d2 between the first Hall sensor and the second magnet 13 is 1.5 mm. The third distance d3 between the second Hall sensor and the second magnet 13 is 0.5 mm, and the fourth distance d4 between the second Hall sensor and the first magnet 12 is 1.5 mm. The first detection element 17 uses the first magnet 12 as its primary sensing object, and the second detection element 18 uses the second magnet 13 as its primary sensing object. For example, the first distance d1 is 1 mm, the second distance d2 between the first Hall sensor and the second magnet 13 is 2 mm, the third distance d3 between the second Hall sensor and the second magnet 13 is 1 mm, and the fourth distance d4 between the second Hall sensor and the first magnet 12 is 3 mm. For example, the first distance d1 is 2 mm, the second distance d2 between the first Hall sensor and the second magnet 13 is 3 mm, the third distance d3 between the second Hall sensor and the second magnet 13 is 2 mm, and the fourth distance d4 between the second Hall sensor and the first magnet 12 is 5 mm.

[0053] It should be noted that the embodiments disclosed herein do not impose specific limitations on the distance between the detection element and the magnet, and the distance can be adjusted according to actual application requirements.

[0054] The distance between the third magnet 14 and the second detection element 18 is the fifth distance d5, which is greater than the third distance. That is, d5 > d3, meaning the distance between the third magnet 14 and the second detection element 18 is greater than the distance between the first magnet 12 and the second detection element 18. This implies that the distance between the second detection element 18 and the third magnet 14 is relatively large, in order to avoid interference or coupling effects of the magnetic field of the third magnet 14 on the second detection element 18. Simultaneously, since the distances between the third magnet 14, the first magnet 12, and the second magnet 13 are not the same, the third magnet 14 and the first magnet 12 are not centrally symmetrical about the center of the first component 11. Therefore, during the electromagnetic force generated between the target component 16 and the magnets driving the first component 11 to move relative to the second component 15, the third magnet 14 and the first magnet 12 have different points of action about the first component 11, enabling the first component 11 to rotate in the XOY plane.

[0055] Understandably, by fixing the first, second, and third magnets onto the first component, with the first and third magnets facing each other and their distance controlled, the three magnets together form a magnetic field distribution structure. This allows the driving device to drive the first component to perform linear and / or rotational motion relative to the second component. Simultaneously, the relatively large distance between the second detection element and the third magnet prevents interference or coupling effects from the third magnet's magnetic field on the second detection element. This makes the detection signal output by the second sensing element more accurate and stable, effectively improving the accuracy of position detection and the reliability of motion control.

[0056] Figure 3 A second schematic diagram of the structure of a drive device according to an embodiment of the present disclosure is shown.

[0057] As mentioned above, the first distance, the second distance, the third distance, the fourth distance, and the fifth distance all represent the spacing between the corresponding magnet and the corresponding detection element.

[0058] For example, the spacing can be a quantitative parameter used to characterize the spatial positional relationship between the corresponding magnet and the corresponding detection element. In actual products, both the detection element and the magnet have specific geometric dimensions. Different methods of selecting the reference point will result in different spacing values, but each value can be used to accurately characterize the relative positional relationship between the two. This disclosure provides a variety of optional value methods, which can be selected according to actual measurement conditions and engineering design requirements.

[0059] In one feasible approach, refer to Figure 3 The spacing is determined as the distance between the geometric center of the corresponding test piece and the geometric center of the corresponding magnet.

[0060] In one example, the geometric center of the detection element can be the geometric center point of the overall packaged outer contour of the detection element in three-dimensional space, and the geometric center of the magnet can be the geometric center point of the overall outer contour of the magnet in three-dimensional space. For example, taking the first detection element 17 as a cuboid-packaged Hall sensor and the first magnet 12 as a cuboid permanent magnet, the geometric center of the first detection element 17 can be the intersection of the midpoints of its length, width, and height, and the geometric center of the first magnet 12 can be the intersection of the midpoints of its length, width, and height, and the first distance d1 can be the straight-line distance between the two geometric center points. As another example, taking the first detection element 17 as a cylindrical packaged magnetic sensor and the first magnet 12 as a cuboid permanent magnet, the geometric center of the first detection element 17 can be the midpoint on its axis, and the geometric center of the first magnet 12 can be the center point of its three-dimensional outer contour, and the first distance d1 can be the straight-line distance between the two geometric center points.

[0061] Figure 4 The third schematic diagram illustrates the structure of a drive device according to an embodiment of the present disclosure.

[0062] In another possible implementation, refer to Figure 4 The spacing is determined as the distance between the center point of the surface of the corresponding detection piece facing the corresponding magnet and the center point of the surface of the corresponding magnet facing the corresponding detection piece.

[0063] In one example, the center point of the surface of the detection element facing the magnet can be the geometric center of the contour of the surface of the detection element facing the magnet, and the center point of the surface of the magnet facing the detection element can be the geometric center of the contour of the surface of the magnet facing the detection element. For example, taking a Hall sensor with a cuboid package as the first detection element 17 and a cuboid permanent magnet as the first magnet 12, and their opposite surfaces as an example, the surface of the first detection element 17 facing the first magnet 12 is a rectangular plane, and the geometric center of the contour of this rectangular plane is its surface center point; the surface of the first magnet 12 facing the first detection element 17 is also a rectangular plane, and the geometric center of the contour of this rectangular plane is its surface center point; the first distance d1 is the straight-line distance between the center points of the two surfaces, and this distance directly reflects the size of the opposing gap between the opposite surfaces of the first detection element 17 and the first magnet 12. For example, taking a magnetic sensor with a circular end face package for the first detection element 17 and a cuboid permanent magnet for the first magnet 12, the center of the circular end face of the first detection element 17 facing the first magnet 12 is its surface center point, the geometric center of the rectangular surface of the first magnet 12 facing the first detection element 17 is its surface center point, and the first distance d1 is the straight-line distance between the two surface center points.

[0064] In another possible implementation, the spacing is determined as the distance between the geometric center point of the corresponding magnet and the sensing center point of the corresponding detection element.

[0065] For example, the sensing center point of the detection element can be the center of the location of the core sensing element inside the detection element that performs the magnetic field sensing function. This location can coincide with the geometric center of the detection element or be offset from the geometric center. For example, taking the first detection element 17 as a Hall sensor, the location of the Hall element inside the Hall sensor is its sensing center point, and the straight-line distance between the geometric center of the first magnet 12 and this sensing center point is the first distance d1. This sensing center point can coincide with the geometric center of the detection element or be offset towards the side of the detection element facing the magnet. As another example, taking the first detection element 17 as a magnetoresistive sensor, the center of the concentrated distribution area of ​​the magnetically sensitive material inside the magnetoresistive sensor is its sensing center point, and the straight-line distance between the geometric center of the first magnet 12 and this sensing center point is the first distance d1. If the sensing center point of the magnetoresistive sensor deviates from the geometric center due to the packaging process, the distance value obtained by the third method is different from that of the first method, but both can accurately characterize the spatial positional relationship between the first magnet 12 and the first detection element 17.

[0066] In another possible implementation, the spacing is determined as the distance between the two closest points in space between the corresponding magnet and the corresponding detection element.

[0067] For example, the two closest points in space between a magnet and a detection element can be a pair of points on their surfaces, which can be corner points of the surfaces. For instance, the first detection element and the first magnet (first distance d1): The first detection element is fixed to the first side of the circuit board at the bottom of the base, with its sensing surface (1.2mm × 1.2mm) facing the bottom surface of the first magnet (4.0mm × 2.0mm). The two are placed face-to-face and parallel, with the sensing surface of the first detection element completely within the projection range of the bottom surface of the first magnet. The two closest points in space are located on their respective opposing surfaces, and the shortest distance is equal to the normal gap between the two parallel surfaces. Using the closest two-point method, the first distance d1 = 0.5mm, which is the same value obtained using the opposing surface center point method. The second detection element and the second magnet (fourth distance d4): The second detection element is fixed on the third side of the circuit board at the bottom of the base. Its sensing surface (1.2mm×1.2mm) faces the bottom surface of the second magnet (4.0mm×2.0mm). The geometric relationship is completely symmetrical with the first detection element and the first magnet. The two closest points between them are also located on the opposing surfaces. Using the closest two-point method, the fourth distance d4=0.5mm, d1=d4=0.5mm, which is the same as the value obtained by the opposing surface center point method. First detection element and second magnet (second distance d2): The first detection element is fixed on the first side of the base, and the second magnet is installed on the third side of the first component. They are distributed in mutually perpendicular directions and are not placed directly face to face. The two closest points between them in space are the corner point on the surface of the second magnet closest to the first detection element and the corner point or edge on the surface of the first detection element closest to the second magnet, respectively. Since the actual position of the corner point in three-dimensional space is closer to the opposite object than the center point of the surface, the second distance d2 is 1.2mm, which is less than 1.5mm obtained by the opposite surface center point method. Second detection element and first magnet (third distance d3): The second detection element is located on the third side of the base, and the first magnet is installed on the first side of the first component. The spatial distribution relationship between the first detection element and the second magnet is symmetrical. The two closest points between them are also located at their respective corner points or edges closest to each other. The third distance d3 is 1.2mm, d2=d3=1.2mm, which is also less than 1.5mm obtained by the opposite surface center point method. The third detection element and the third magnet: The third detection element is fixed on the second side of the circuit board at the bottom of the base, and its sensing surface (1.2mm×1.2mm) faces the bottom surface of the third magnet (2.0mm×1.0mm). The two are placed face to face and parallel to each other. The bottom surface of the third magnet is narrower than the corresponding dimension (1.2mm) of the sensing surface of the third detection element in the 1.0mm direction. The projection areas of the two face to face have partial overlap. The two closest points are located on the opposing surfaces in the overlapping area. The shortest distance is equal to the normal gap between the two parallel surfaces. Using the closest two-point method, the distance between the third detection element and the third magnet is 0.5mm, which is the same as the value obtained by the opposing surface center point method.The third magnet and the second detection element (fifth distance d5): The third magnet is installed on the second side of the first component, and the second detection element is fixed on the third side of the base. The two are in an oblique orientation and are not directly facing each other. The two closest points in space are located at the corner point on the surface of the third magnet that is closest to the second detection element and the corner point or edge on the surface of the second detection element that is closest to the third magnet. Using the nearest two-point method, the fifth distance d5 = 1.6 mm, which is less than 2.0 mm obtained by the opposing surface center point method. d5 = 1.6 mm > d3 = 1.2 mm, which satisfies the constraint condition d5 > d3.

[0068] It should be noted that the specific value of the spacing is not limited in the embodiments disclosed herein. Under the premise that the geometric shape and relative position of the corresponding magnet and the corresponding detection element are determined, the above three value methods can be used to accurately characterize the spatial distance relationship between the two. One of the value methods can be selected according to the actual design requirements and measurement conditions, and the same value method can be used in the same set of spacing comparisons.

[0069] As described above, in some embodiments, the size of the third magnet 14 is smaller than the size of the first magnet 12; and / or the size of the third magnet 14 is smaller than the size of the second magnet 13.

[0070] For example, the length of the third magnet 14 along the X direction is less than the length of the first magnet 12 along the X direction. The length of the third magnet 14 along the X direction is less than the length of the second magnet 13 along the Y direction.

[0071] For example, the size of the magnet can be a parameter characterizing the volume occupied by the magnet in space. For instance, the size of the magnet can be its overall volume; it can also be the external length of the magnet in at least one direction, such as at least one of length, width, and height; or it can be the area of ​​the magnet's pole face, i.e., the surface area of ​​the magnet facing the corresponding target 16 or the corresponding detection element. It should be noted that this disclosure does not limit the specific comparison method for dimensions. When comparing the dimensions of the third magnet 14 with the first magnet 12 or the second magnet 13, the same comparison method can be used, and one method can be selected according to actual design requirements and measurement conditions.

[0072] For example, the size of the third magnet 14 is smaller than the size of the first magnet 12, which can be that the outer length of the third magnet 14 in the X direction is smaller than the outer length of the first magnet 12 in the X direction; the size of the third magnet 14 is smaller than the size of the second magnet 13, which can be that the outer length of the third magnet 14 in the X direction is smaller than the outer length of the second magnet 13 in the Y direction.

[0073] The size of the third magnet 14 is smaller than the size of the first magnet 12, and the size of the third magnet 14 is smaller than the size of the second magnet 13. These two conditions can hold simultaneously or only one of them can hold. For example, taking the driving device 10 as the optical image stabilization (OIS) driving mechanism in a camera module, the first magnet 12 and the second magnet 13 can both be main driving magnets responsible for driving the first component 11 to perform the main translational motion, and their sizes can be the same. The third magnet 14 can be an auxiliary magnet. At this time, the size of the third magnet 14 is smaller than the sizes of both the first magnet 12 and the second magnet 13, that is, the above two constraints are satisfied simultaneously.

[0074] In one example, taking the driving device 10 as the optical image stabilization (OIS) driving mechanism in a camera module, the first component 11 as the carrier (rotor) for mounting the lens, and the second component 15 as the base, the above size relationship will be further described. Continuing to refer to FIG. 2, the first magnet 12, the second magnet 13, and the third magnet 14 are all rectangular permanent magnets. The external dimensions of the first magnet 12 are 4.0 mm (length) × 2.0 mm (width) × 1.5 mm (height), and it is installed on the first side (X direction) of the first component 11; the external dimensions of the third magnet 14 are 2.0 mm (length) × 1.0 mm (width) × 1.0 mm (height), and it is installed on the second side (X direction) of the first component 11. The second side of the first component 11 and the first side of the first component 11 are opposite sides, that is, the first side and the second side are parallel to each other; the external dimensions of the second magnet 13 are 4.0 mm (length) × 2.0 mm (width) × 1.5 mm (height), and it is installed on the third side (Y direction) of the first component 11, located between the first magnet 12 and the third magnet 14. The third side of the first component 11 is perpendicular to the first side of the first component 11. In the external length direction: the length L3 of the third magnet 14 = 2.0 mm < L1 = L2 = 4.0 mm, and the external dimensions of the first magnet 12 and the second magnet 13 in the length direction are the same. The external dimensions of the third magnet 14 in the length direction are smaller than the external dimensions of the first magnet 12 and the second magnet 13 in the corresponding direction.

[0075] As described above, in some embodiments, the first component 11 can move clockwise or counterclockwise relative to the second component 15.

[0076] The driving device 10 further includes: a third detection member 19.

[0077] The third detection element 19 is disposed on the second component 15. The driving device 10 includes a first state and a second state. In the first state, the first component 11 is located at a first position relative to the second component 15. In the second state, the first component 11 is located at a second position relative to the second component 15. In the first state, the magnetic quantity that the first detection element 17 can detect is a first value, the magnetic quantity that the second detection element 18 can detect is a second value, and the magnetic quantity that the third detection element 19 can detect is a third value. The first value is the same as the second value, and the third value is different from the first value. In the second state, the magnetic quantity that the first detection element 17 can detect is a fourth value, the magnetic quantity that the second detection element 18 can detect is a fifth value, and the magnetic quantity that the third detection element 19 can detect is a sixth value. The fourth value is the same as the fifth value, and the sixth value is different from the fifth value.

[0078] For example, the first component 11 can move clockwise or counterclockwise relative to the second component 15. This can be achieved by the first component 11 rotating relative to the second component 15 around the Z-axis in a plane perpendicular to the lens optical axis (i.e., the XOY plane) under the drive of the target component 16. The rotation direction includes both clockwise and counterclockwise directions. For instance, taking the drive device 10 as the optical image stabilization (OIS) drive mechanism in the camera module and the first component 11 as the carrier for mounting the lens, when the coil responsible for driving the rotational motion in the target component 16 is energized, the first magnet 12 and the third magnet 14, due to their asymmetrical positions on the first component 11 about the rotation center, experience an Ampere force that generates a rotational torque on the first component 11. This drives the first component 11 to rotate relative to the second component 15 in a clockwise or counterclockwise direction, thereby compensating for image shake in the lens rotation direction.

[0079] The third detection element 19 can be a magnetic sensor used to sense changes in the surrounding magnetic field strength. For example, the third detection element 19 can be a third Hall sensor; it can also be a magnetoresistive sensor or other sensor capable of sensing changes in the magnetic field. The third detection element 19 is disposed on the second component 15, with the third magnet 14 as the primary sensing object, that is, the third detection element 19 is disposed in the second component 15 at a position opposite to the third magnet 14 on the first component 11. For example, the third Hall sensor is soldered and fixed to the bottom circuit board of the base (second component 15) on the side close to the third magnet 14, so that the third detection element 19 can sense changes in the magnetic field as the third magnet 14 moves.

[0080] The first state and the second state of the drive device 10 can be two operating states of the drive device 10 when the first component 11 is in different rotational positions relative to the second component 15. For example, the first state can be the position (first position) where the first component 11 is rotated counterclockwise by a first angle relative to the second component 15 under the drive of the target component 16; the second state can be the position (second position) where the first component 11 is rotated clockwise by a second angle relative to the second component 15 under the drive of the target component 16. The first angle and the second angle can be the same or different.

[0081] Magnetic quantity can be a physical quantity related to the magnetic field strength that the sensing device can detect in its current state. For example, magnetic quantity can be magnetic flux density; magnetic quantity can also be an analog voltage value or a digitally quantized value after analog-to-digital conversion output by the sensing device based on the detected magnetic field strength.

[0082] In one example, in the first state, the first component 11 rotates clockwise relative to the second component 15. The first value is the same as the second value. The first magnet 12 and the second magnet 13 can be the same size and can be installed on opposite sides of the first component 11. The distances from both to the rotation center of the first component 11 can be equal. The lateral displacement of the first magnet 12 relative to the first detection element 17 and the lateral displacement of the second magnet 13 relative to the second detection element 18 can be equal, so that the magnetic field strength at the location of the first detection element 17 and the location of the second detection element 18 can be the same in the first state, and the magnetic quantities output by both can be equal, that is, the first value and the second value can be the same. The third value is different from the first value, which may be because the first detection element 17 and the third detection element 19 are located on opposite sides of the first component 11. The first detection element 17 detects the displacement of the first magnet 12 to the left, and the third detection element 19 detects the displacement of the first magnet 12 to the right. The third value detected by the third detection element 19 is opposite to the first value detected by the first detection element 17. For example, when the first component 11 rotates 0.3 degrees clockwise in the XOY plane, the first detector 17 detects a positive displacement in the X direction (to the right), and therefore outputs a positive value. The second detector 18 detects a positive displacement in the Y direction (upward), and therefore outputs a positive value. The third detector 19 detects a negative displacement in the X direction (to the left), and therefore outputs a negative value. Simultaneously, when rotating by the same angle, the three magnets rotate around the center of the first component, and the distance between the third magnet and the third detector is less than the distance between the first magnet and the first detector. Therefore, the first value detected by the first detector and the third value detected by the second detector are not only opposite in value, but also different in magnitude.

[0083] In the second state, the first component 11 rotates counterclockwise relative to the second component 15. The fourth and fifth values ​​are the same. The first magnet 12 and the second magnet 13 can be the same size and can be installed on opposite sides of the first component 11. The distances from both to the rotation center of the first component 11 can be equal. The lateral displacement of the first magnet 12 relative to the first detection element 17 and the lateral displacement of the second magnet 13 relative to the second detection element 18 can be equal, so that the magnetic field strength at the location of the first detection element 17 and the location of the second detection element 18 can be the same in the second state, and the magnetic output of both can be equal, i.e., the fourth and fifth values ​​are the same. The sixth value is different from the fifth value, which may be because the first detection element 17 and the third detection element 19 are located on opposite sides of the first component 11. The first detection element 17 detects the displacement of the first magnet 12 to the right, and the third detection element 19 detects the displacement of the first magnet 12 to the left. The third value detected by the third detection element 19 is opposite to the first value detected by the first detection element 17. For example, when the first component 11 rotates counterclockwise by 0.3 degrees in the XOY plane, the first detector 17 detects a negative displacement in the X direction (to the left), and therefore outputs a negative value. The second detector 18 detects a negative displacement in the Y direction (downward), and therefore outputs a negative value. The third detector 19 detects a positive displacement in the X direction (to the right), and therefore outputs a positive value. Simultaneously, when rotating by the same angle, the three magnets rotate around the center of the first component, and the distance between the third magnet and the third detector is less than the distance between the first magnet and the first detector. Therefore, the first value detected by the first detector and the third value detected by the second detector are not only opposite in value, but also different in magnitude.

[0084] The magnetic field strength of the equivalent magnet itself is an arc. If two points are geometrically symmetrical with respect to the main magnet, they may fall on the same magnetic field isopleth. When the first component 11 rotates a small angle relative to the second component 15, the first detection element 17 and the second detection element 18 are in a condition of equal magnetic strength, that is, the first detection element 17 and the second detection element 18 sense the same intensity at different positions. Since the third detection element 19 is arranged opposite to the first detection element 17, and the third detection element 19 detects a different magnetic strength than the first detection element 17 and the second detection element 18, the third detection element 19 can serve as an additional asymmetric reference point to distinguish the state of the first component 11's attitude that cannot be determined by the first detection element 17 and the second detection element 18. This can provide a basis for identifying the rotational offset of the first component 11 and subsequent closed-loop compensation.

[0085] It should be noted that the specific rotation angles corresponding to the first and second states in this embodiment are not limited, and can be set according to actual application requirements and design accuracy requirements.

[0086] Understandably, by setting a third detection element on the second component, a specific correspondence between the three detection elements is formed, providing differentiated signals for independent perception of the rotation state. By comprehensively calculating the output values ​​of the three detection elements, the rotation angle information of the first component can be extracted simultaneously, effectively improving the driving device's ability to perceive the complete motion state of the first component 11 and the accuracy of rotation direction and position control.

[0087] As described above, in some embodiments, the difference between the first value and the fourth value is the first difference, the difference between the second value and the fifth value is the second difference, the difference between the third value and the sixth value is the third difference, the first difference is the same as the second difference, and the third difference is different from the first difference.

[0088] For example, the difference can be a quantitative expression of the difference between the magnetic quantity detected by the same detector in a first state and the magnetic quantity detected in a second state. For instance, the difference can be a directed difference, i.e., a signed result obtained by subtracting the magnetic quantity in the second state from the magnetic quantity in the first state. In this case, the sign of the difference can also reflect the direction of increase or decrease in magnetic quantity between the two states. For a specific numerical example, if a detector detects a magnetic quantity of 80 Gs in the first state and 83 Gs in the second state, the difference is 80 - 83 = -3 Gs. The negative sign indicates that the magnetic quantity of the detector in the second state is higher than that in the first state.

[0089] The first difference is the difference between the magnetic quantity output by the first detection element 17 in the first state and the magnetic quantity output in the second state; the second difference is the difference between the magnetic quantity output by the second detection element 18 in the first state and the magnetic quantity output in the second state; the third difference is the difference between the magnetic quantity output by the third detection element 19 in the first state and the magnetic quantity output in the second state.

[0090] The first difference and the second difference are the same because the first magnet 12 and the second magnet 13 are the same size, and the distance between the first detection element 17 and the first magnet 12 is equal to the distance between the second detection element 18 and the second magnet 13 (i.e., d1=d4). The first magnet 12 and the second magnet 13 are respectively installed on two mutually perpendicular sides of the first component 11 and are equidistant from the rotation center of the first component 11. During the process of the first component 11 moving from the first position to the second position, the displacement of the first magnet 12 relative to the first detection element 17 is equal to the displacement of the second magnet 13 relative to the second detection element 18. The change in magnetic field strength sensed by the two detection elements is the same, so the first difference is equal to the second difference. For example, taking the first component 11 rotating clockwise around the Z-axis from the first position to the second position, the displacement of the first magnet 12 relative to the first detection element 17 in the tangential direction is equal in magnitude to the displacement of the second magnet 13 relative to the second detection element 18 in the tangential direction. The change in magnetic induction intensity at the positions of the two detection elements is the same, and the first difference is the same as the second difference.

[0091] The third difference is different from the first difference. This could be because the size of the third magnet 14 is smaller than that of the first magnet 12. The change in magnetic field gradient generated by the third magnet 14 on the third detection element 19 under a unit displacement is different from the change in magnetic field gradient generated by the first magnet 12 on the first detection element 17 under a unit displacement. During the process of the first component 11 moving from the first position to the second position, the change in magnetic field strength sensed by the third detection element 19 is different from that of the first detection element 17. Therefore, the third difference is different from the first difference. For example, when the first component 11 rotates, since the third magnet 14 is installed on the second side of the first component 11 and the first magnet 12 is installed on the first side of the first component 11, the first side and the second side are opposite sides. When rotating, the tangential motion direction of the third magnet 14 relative to the third detection element 19 is opposite to the tangential motion direction of the first magnet 12 relative to the first detection element 17. The magnetic field changes caused by the two at their respective detection elements are also opposite. On this basis, the size of the third magnet 14 is smaller than that of the first magnet 12, which further makes the magnetic field response quantities of the two different in amplitude. Thus, the third difference and the first difference are different in both direction and amplitude of change, satisfying the constraint that the third difference and the first difference are different.

[0092] It should be noted that, unless otherwise expressly defined, the term "same" in this disclosure includes not only strict mathematical equality, but also that the difference between the two is within an acceptable error range, i.e., "substantially the same". The acceptable error range includes, but is not limited to, reasonable deviations caused by factors such as manufacturing tolerances, assembly tolerances, inspection accuracy, or temperature drift. For example, describing two distances as "same" means that the numerical values ​​of the two distances are equal, or that the difference between them is within a preset threshold (such as ±5%, ±0.1mm, or ±0.5°, etc., which can be exemplified according to specific application scenarios).

[0093] As described above, in some embodiments, the target component 16 includes a first drive component 161, a second drive component 162, and a third drive component 163 capable of releasing magnetism.

[0094] The first driving element 161 releases magnetism that can affect the first magnet 12, the second driving element 162 releases magnetism that can affect the second magnet 13, and the third driving element 163 releases magnetism that can affect the third magnet 14.

[0095] The size of the third drive member 163 is smaller than the size of the first drive member 161, and / or the size of the third drive member 163 is smaller than the size of the second drive member 162.

[0096] In some examples, the orthographic projection of the first drive member 161 in the X direction at least covers the orthographic projection of the first magnet 12 in the X direction. The orthographic projection of the second drive member 162 in the Y direction at least covers the orthographic projection of the second magnet 13 in the Y direction. The orthographic projection of the third drive member 163 in the X direction at least covers the orthographic projection of the third magnet 14 in the X direction.

[0097] For example, the first driving element 161, the second driving element 162, and the third driving element 163 can all be driving elements that can generate a magnetic field and apply an electromagnetic force to the corresponding magnet when energized or excited by a control signal. For instance, the first driving element 161, the second driving element 162, and the third driving element 163 can all be electromagnetic coils, which generate an Ampere force or a Lorentz force with the corresponding magnet after being energized, thereby driving the first component 11 to move; the first driving element 161, the second driving element 162, and the third driving element 163 can also be other elements that can change the magnetic field distribution after being energized, such as electromagnets, energized soft magnetic elements, etc.

[0098] The first driving element 161 is correspondingly disposed with the first magnet 12. When the first driving element 161 is energized, the magnetic field it generates acts on the first magnet 12, forming an electromagnetic force between them, which drives the first component 11 to move along the X-direction. The second driving element 162 is correspondingly disposed with the second magnet 13. When the second driving element 162 is energized, the magnetic field it generates acts on the second magnet 13, forming an electromagnetic force between them, which drives the first component 11 to move along the Y-direction. The third driving element 163 is correspondingly disposed with the third magnet 14. When the third driving element 163 is energized, the magnetic field it generates acts on the third magnet 14, forming an electromagnetic force between them. This electromagnetic force, in conjunction with the driving force of the first driving element 161 or the second driving element 162, drives the first component 11 to rotate within the XOY plane.

[0099] Here, the dimensions of the driving element can be parameters that characterize the driving element's ability to generate a magnetic field or its physical specifications, including at least one of the following: the projected area of ​​the driving element's outline in a direction perpendicular to its magnetic field; the effective winding area of ​​the driving element; and at least one dimension of the driving element's dimensions (e.g., the length of the driving element). For example, taking an electromagnetic coil as the driving element, the dimensions of the driving element can refer to the winding area of ​​the coil. The larger the winding area, the greater the Ampere force generated by the coil under the same energizing conditions, and the greater the maximum driving force on the corresponding magnet.

[0100] The third driving element 163 is smaller than the first driving element 161 and / or the second driving element 162, meaning that under the same energizing conditions, the maximum driving force that the third driving element 163 can generate is relatively smaller. Since the third driving element 163 mainly bears the driving force required to drive the first component 11 to rotate in the XOY plane, while the translational driving in the X and Y directions is undertaken by the first driving element 161 and the second driving element 162 respectively, the maximum driving force required by the third driving element 163 is relatively small, and the rotational compensation function requirement can be met with a smaller-sized driving element. At the same time, the smaller size of the third driving element 163 limits the range of its generated magnetic field, helping to reduce the interference caused by the magnetic field spreading to the surrounding area and affecting the detection component.

[0101] It should be noted that the specific dimensions of the first driving member 161, the second driving member 162, and the third driving member 163 are not limited in this embodiment and can be adjusted according to factors such as the actual range of motion of the driving device 10, the rotational compensation torque requirement, and the structural space.

[0102] Understandably, by setting the target component to include a first drive component, a second drive component, and a third drive component corresponding to the first magnet, the second magnet, and the third magnet respectively, the three drive components can independently apply electromagnetic force to the corresponding magnets, thereby realizing independent control of the first component in translational and rotational motion, effectively improving the flexibility and accuracy of motion control.

[0103] As described above, in some embodiments, the driving device 10 includes a third state in which the first driving member 161 and the second driving member 162 jointly release a first magnetism, which can drive the first magnet 12 and the second magnet 13 to move along a first direction; the third driving member 163 releases a second magnetism, which can drive the third magnet 14 to move along a second direction, which is opposite to the first direction.

[0104] Here, the first direction is the positive direction of X, and the second direction is the negative direction of X.

[0105] For example, in addition to driving the first component 11 to translate in the X and Y directions, the driving device 10 also includes a third state for driving the first component 11 to rotate in the XOY plane. For instance, in the optical image stabilization (OIS) application scenario of a camera module, when an unexpected rotational deviation is detected in the lens carrier (first component 11) due to the lack of a guide groove ball bearing structure, the driving device 10 can enter the third state, where the first driving member 161 and the second driving member 162 work together, and the third driving member 163 acts independently in the opposite direction, to jointly form the required rotational compensation torque on the first component 11.

[0106] In the third state, the first driving element 161 and the second driving element 162 jointly release the first magnetism, which means that the first driving element 161 and the second driving element 162 are simultaneously excited by the control signal, and the magnetic fields generated by each of them are all in the first direction as the resultant force direction, respectively applying electromagnetic force along the first direction to the first magnet 12 and the second magnet 13. The first magnet 12 and the second magnet 13 are both driven by the first force in the first direction.

[0107] Here, the first magnetism can be understood as the combined force effect of the magnetic fields generated by the first driving member 161 and the second driving member 162 in the third state on the corresponding magnets. This combined force causes the first magnet 12 and the second magnet 13 to be driven along the first direction.

[0108] At the same time, the third driving element 163 releases the second magnetism, which means that after the third driving element 163 is excited by the control signal, the magnetic field generated applies an electromagnetic force along the second direction to the third magnet 14 with the second direction as the direction of action. The second direction is opposite to the first direction.

[0109] In one example, taking the first driving element 161, the second driving element 162, and the third driving element 163 as electromagnetic coils, in the third state, the first coil and the second coil are simultaneously supplied with positive current. The first coil applies an Ampere force along the first direction (e.g., the +X direction) to the first magnet 12, and the second coil also applies an Ampere force along the first direction (+X direction) to the second magnet 13. The third coil is supplied with a current in the opposite direction to that of the first coil, so that the third coil applies an Ampere force along the second direction (e.g., the −X direction) to the third magnet 14, so that the direction of the driving force on the third magnet 14 is opposite to the direction of the driving force on the first magnet 12 and the second magnet 13.

[0110] Since the first magnet 12, the second magnet 13, and the third magnet 14 are fixedly disposed at different positions on the first component 11, the first magnet 12 and the second magnet 13 are subjected to force along the first direction (+X direction), and the third magnet 14 is subjected to force along the second direction (−X direction). The directions and positions of the forces acting on the three magnets are different, forming a resultant torque on the first component 11, thereby driving the first component 11 to rotate in the XOY plane. In addition, since the third magnet 14 and the first magnet 12 are oriented opposite each other and are not centrally symmetrical about the center of the first component 11, the electromagnetic forces generated between each magnet and the driving component form a couple in space, further enhancing the effect of generating the rotational torque.

[0111] It should be noted that the embodiments disclosed herein do not limit the magnitude of the energizing current and the specific mode of action of each driving component in the third state, and can be flexibly adjusted according to the magnitude and direction of the torque required for rotational compensation.

[0112] It is understandable that by having the first and second driving components work together to drive the first and second magnets to move along the first direction, and the third driving component independently drive the third magnet to move along the second direction opposite to the first direction, the spatial distribution of the three driving components at different working positions of the first component and the asymmetrical arrangement of the first and third magnets facing opposite directions are fully utilized to form a rotational compensation torque on the first component. This achieves active control of the rotational motion of the first component in the XOY plane, effectively solving the problem of unstable optical image stabilization performance caused by the unexpected rotation of the mover in the guide slot-less structure, and improving the accuracy and reliability of the overall motion control of the driving device.

[0113] As described above, in some embodiments, the drive device 10 further includes at least one of the following:

[0114] The second driving element 162 and the third driving element 163 can provide different maximum magnetic forces;

[0115] The second driving element 162 has the same maximum magnetic force as the first driving element 161;

[0116] The orientations of the first magnet 12 and the second magnet 13 satisfy the perpendicular condition;

[0117] The orientations of the first magnet 12 and the third magnet 14 satisfy opposite conditions;

[0118] The orientations of the second magnet 13 and the third magnet 14 satisfy the perpendicular condition;

[0119] The orientations of the first driving member 161 and the second driving member 162 satisfy the perpendicular condition;

[0120] The orientations of the first driving member 161 and the third driving member 163 satisfy the perpendicular condition;

[0121] The orientations of the second drive member 162 and the third drive member 163 satisfy opposite conditions.

[0122] For example, the maximum magnetic force that the driving component can provide can refer to the maximum electromagnetic force that the driving component can apply to its corresponding magnet after being energized under rated operating conditions. For instance, taking an electromagnetic coil as the driving component, the maximum magnetic force that the driving component can provide is directly related to parameters such as the winding area, the number of turns, and the maximum allowable current of the coil. Under the condition of the same maximum allowable current, the larger the winding area, the greater the maximum electromagnetic force that the driving component can generate on the corresponding magnet.

[0123] For example, the second driving member 162 and the third driving member 163 can provide different maximum magnetic forces, meaning that the maximum electromagnetic forces that the second driving member 162 and the third driving member 163 can apply to their respective corresponding magnets under the maximum permissible operating conditions differ. For instance, if the winding area of ​​the third driving member 163 is smaller than that of the second driving member 162, under the same maximum permissible current condition, the maximum electromagnetic force that the third driving member 163 can apply to the third magnet 14 is less than the maximum electromagnetic force that the second driving member 162 can apply to the second magnet 13. The second driving member 162 and the first driving member 161 can provide the same maximum magnetic force, meaning that the first driving member 161 and the second driving member 162 can apply the same maximum electromagnetic force to their respective corresponding magnets under the maximum permissible operating conditions. For example, if the first driving member 161 and the second driving member 162 have the same winding area and the same number of winding turns, under the condition that the maximum allowable current is the same, the first driving member 161 and the second driving member 162 can apply the same maximum electromagnetic force to the first magnet 12 and the second magnet 13 respectively.

[0124] The orientation of a magnet can refer to the direction in which its magnetic pole axes point, i.e., the direction in which the N pole of the magnet points. For magnets to be perpendicular, their magnetic pole axes must point perpendicularly to each other in the XOY plane. Conversely, their magnetic pole axes must point in opposite directions, i.e., they must be antiparallel.

[0125] For example, the orientations of the first magnet 12 and the second magnet 13 satisfy the perpendicular condition, and the orientations of the first magnet 12 and the third magnet 14 satisfy the opposite condition; the S pole of the first magnet 12 faces the first side of the first component 11, and the S pole of the second magnet 13 faces the second side of the first component 11. The orientations of the second magnet 13 and the third magnet 14 satisfy the perpendicular condition; the S pole of the third magnet 14 faces the third side of the first component 11.

[0126] The orientation of a driving component can refer to its installation direction. For driving components to satisfy the perpendicularity condition, the two driving components are installed in directions perpendicular to each other; for driving components to satisfy the opposite condition, the two driving components are installed on different parallel sides of the same object.

[0127] For example, the orientations of the first driving member 161 and the second driving member 162 satisfy the perpendicular condition; the orientations of the first driving member 161 and the third driving member 163 satisfy the perpendicular condition; and the orientations of the second driving member 162 and the third driving member 163 satisfy the opposite condition. When the driving member is a coil, the first coil (first driving member 161) is arranged along the X direction and located on the first side of the first component 11; the second coil is arranged along the Y direction and located on the third side of the first component 11; and the third coil is arranged along the X direction and located on the second side of the first component 11. The first side and the second side are parallel, and the third side is perpendicular to the first side.

[0128] Based on the above-described driving device, this disclosure also discloses an imaging device, which will be described below in conjunction with... Figures 5-6 The imaging apparatus of the present disclosure will be described.

[0129] Figure 5 A schematic diagram of the structure of an imaging apparatus according to an embodiment of the present disclosure is shown.

[0130] like Figure 5 As shown in the figure, this disclosure provides an imaging device 1, which includes a driving device 10 and an imaging component 20.

[0131] The driving device 10 includes: a first component 11, which has a first magnet 12, a second magnet 13, and a third magnet 14 fixed relative to each other, with the first magnet 12 and the third magnet 14 facing each other; a second component 15, which is movable relative to the first component 11, and has a target component 16 that can release magnetism to move the magnets; a first detection component 17, which is disposed on the second component 15 and can detect changes in magnetism, with a first distance between the first detection component 17 and the first magnet 12, and a second distance between the first detection component 17 and the second magnet 13; a second detection component 18, which is disposed on the second component 15 and can detect changes in magnetism, with a third distance between the second detection component 18 and the first magnet 12, and a fourth distance between the second detection component 18 and the second magnet 13, where the third distance is the same as the second distance and the fourth distance is the same as the first distance; and a fifth distance between the third magnet 14 and the second detection component 18, where the fifth distance is greater than the third distance.

[0132] Imaging component 20 is fixed relative to the first component 11, or imaging component 20 is fixed relative to the second component 15.

[0133] For example, a description of the drive device 10 can be found by referring to Figure 2 The description of the drive device 10 will not be repeated here.

[0134] Imaging component 20 can be a device for optically imaging a target object. For example, imaging component 20 can be a lens assembly, such as a lens consisting of one or more optical lenses, for converging external incident light to form an optical image on a photosensitive surface; imaging component 20 can also be a photosensitive element, such as a complementary metal-oxide-semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor, for converting the optical image into a processable electrical signal.

[0135] In one example, the imaging component 20 is relatively fixed to the first component 11. This means the relative position between the imaging component 20 and the first component 11 remains constant. The imaging component 20 can move synchronously with the first component 11. When the first component 11 is displaced under the drive of the target component 16, the imaging component 20 can move accordingly. For example, based on the aforementioned embodiment of the driving device 10, the driving device 10 can be used as an optical image stabilization (OIS) driving mechanism in a camera module, the first component 11 as a lens carrier, and the second component 15 as a base. In this case, the imaging component 20 can be a lens assembly, which is fixedly mounted on the lens carrier (first component 11). The optical axis of the lens assembly is perpendicular to the XOY plane, and the imaging component 20 is relatively fixed to the first component 11. A current is passed through the electromagnetic coil (target component 16) on the base (second component 15). This generates an electromagnetic force between the electromagnetic coil and the first magnet 12, the second magnet 13, and the third magnet 14 on the lens carrier. This force drives the lens carrier, along with the lens assembly, to move along the X or Y direction in a plane perpendicular to the lens optical axis. This compensates for image shift caused by external shaking, achieving optical image stabilization. The first Hall sensor and the second Hall sensor detect changes in the magnetic field in real time and output position signals. These signals are then used by the drive control circuit to perform closed-loop control of the lens assembly's displacement, continuously correcting the actual position of the lens assembly.

[0136] In another example, the imaging component 20 is relatively fixed to the second component 15. This means the relative position between the imaging component 20 and the second component 15 remains constant. During the movement of the first component 11 relative to the second component 15, the imaging component 20 may not move with the first component 11. For example, based on the aforementioned embodiment of the driving device 10, the driving device 10 can be used as an optical image stabilization (OIS) driving mechanism in a camera module, the first component 11 as a lens carrier, and the second component 15 as a base. In this case, the imaging component 20 can be a photosensitive element, fixedly mounted on the base (second component 15). The photosensitive element is relatively fixed to the second component 15 and may not move with the lens carrier (first component 11). When the driving device 10 drives the lens carrier and lens assembly to move, the photosensitive element can remain stationary, receiving the light converged by the lens assembly and converting the optical image into an electrical signal to complete image acquisition.

[0137] Figure 6 A schematic cross-sectional view of an imaging apparatus 1 according to an embodiment of the present disclosure is shown.

[0138] like Figure 6 As shown, the imaging device 1 of this embodiment includes: a third component 30, a fourth driving component 40, a fourth magnet 50, and a fourth detection component 60.

[0139] The third component 30, in which the first component 11 is nested; the fourth driving component 40, disposed in the third component 30; the fourth magnet 50, disposed in the first component 11, the fourth driving component 40 being able to release magnetism to act on the fourth magnet 50, causing the first component 11 to extend or retract relative to the third component 30; and the fourth detection component 60, disposed in the third component 30, the fourth detection component 60 being able to detect changes in magnetism.

[0140] For example, the third component 30, the fourth drive member 40, the fourth magnet 50, and the fourth detection member 60 can collectively constitute the autofocus mechanism of the imaging device 1, that is, the third component 30, the fourth drive member 40, the fourth magnet 50, and the fourth detection member 60 work together to drive the imaging component 20 to reciprocate along the Z direction. The drive device 10 can serve as the optical image stabilization mechanism of the imaging device 1, that is, the drive device 10 is used to drive the imaging component 20 to move along the X direction, move along the Y direction, and rotate in the XOY plane.

[0141] The third component 30 can be a focusing housing, for example, the third component 30 can also be a lens barrel, for example, a cylindrical housing with a circular or square cross-section, the first component 11 (lens carrier) is placed in its inner cavity, the third component 30 carries the fourth drive component 40 and the fourth detection component 60, and is connected to the second component 15 (base) on the outside.

[0142] The fourth magnet 50 can be a permanent magnet, which is fixedly installed on the outer side of the first component 11 and moves synchronously with the first component 11.

[0143] The fourth driving element 40 can be a structural component capable of generating or changing its magnetic field when excited by a control signal, thereby applying an Ampere force to the fourth magnet 50 and driving the first component 11 to move in a telescoping motion relative to the third component 30 in the Z direction. For example, the fourth driving element 40 can be a focusing coil, such as a ring-shaped electromagnetic coil wound and fixed to the inner wall of the third component 30. When a forward or reverse current is applied to the focusing coil, an Ampere force in the Z direction is generated between the focusing coil and the fourth magnet 50, driving the first component 11 to move in the Z direction toward or away from the photosensitive element, thereby adjusting the imaging distance between the lens assembly and the photosensitive element and realizing the autofocus (AF) function.

[0144] In one example, continuing with the aforementioned camera module, a forward or reverse current is applied to the focusing coil, generating an Ampere force along the Z-direction between the focusing coil and the patch permanent magnet. This drives the lens carrier, along with the lens assembly, to move relative to the focusing housing in the Z-direction towards or away from the bottom of the base (second component 15), adjusting the imaging distance between the lens assembly and the photosensitive element (imaging component 20) fixed on the base, thus achieving autofocus. The fourth Hall sensor detects changes in the magnetic field strength of the patch permanent magnet in real time and outputs a Z-direction displacement signal. This signal is then used by the drive control circuit to perform closed-loop control of the lens assembly's focusing position, ensuring that the lens assembly is precisely positioned at the target focus point. During this process, the electromagnetic forces between the target component 16 (electromagnetic coil) and the first magnet 12, the second magnet 13, and the third magnet 14 synchronously drive the lens carrier to perform optical image stabilization in the XOY plane. The autofocus and optical image stabilization functions work together without interfering with each other.

[0145] It should be noted that the present invention does not impose specific limitations on the specific structural form of the third component 30, the winding method and arrangement position of the fourth driving component 40, the magnetization direction and installation position of the fourth magnet 50, or the specific device type of the fourth detection component 60. These limitations can be adjusted according to actual application requirements.

[0146] It is understandable that by adding a third component, a fourth driving component, a fourth magnet, and a fourth detection component 60 to the imaging device, the first component (lens carrier) can not only achieve optical image stabilization (OIS) movement in the XOY plane under the drive of the target component, but also can extend and retract relative to the third component in the Z direction under the drive of the fourth driving component to achieve autofocus (AF) function. Thus, the imaging device has both optical image stabilization and autofocus capabilities, meeting the driving requirements of the camera module in both image stabilization and focus dimensions.

[0147] The driving device in this embodiment can be a voice coil motor, piezoelectric motor, ultrasonic motor, or electromagnetic actuator, etc., used to achieve linear or rotational driving of the driven component. The imaging device can be a camera module, a camera module, or an optical lens assembly, widely used in portable electronic devices, such as mobile phones, tablets, laptops, desktop computers, digital cameras, surveillance cameras, vehicle-mounted camera devices, and drone aerial photography equipment, etc.

[0148] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0149] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A driving device, comprising: The first component is provided with a first magnet, a second magnet, and a third magnet that are relatively fixed, with the first magnet and the third magnet facing each other. The second component is movable relative to the first component. The second component is provided with a target component that can release magnetism to make a magnet move. A first detection element is disposed on the second component. The first detection element is capable of detecting magnetic changes. The distance between the first detection element and the first magnet is a first distance, and the distance between the first detection element and the second magnet is a second distance. A second detection element is disposed on the second component. The second detection element is capable of detecting magnetic changes. The distance between the second detection element and the first magnet is a third distance. The distance between the second detection element and the second magnet is a fourth distance. The third distance is the same as the second distance, and the fourth distance is the same as the first distance. The distance between the third magnet and the second detection element is the fifth distance, which is greater than the third distance.

2. The driving device according to claim 1, wherein the first distance, the second distance, the third distance, the fourth distance, and the fifth distance all characterize the distance between the corresponding magnet and the corresponding detection element; The spacing can be determined in any of the following ways: The distance between the geometric center of the corresponding test piece and the geometric center of the corresponding magnet; The distance between the center point of the surface of the corresponding detection piece facing the corresponding magnet and the center point of the surface of the corresponding magnet facing the corresponding detection piece; The distance between the geometric center point of the corresponding magnet and the sensing center point of the corresponding detection element; The distance between the two closest points in space between the corresponding magnet and the corresponding detection element.

3. The driving device according to claim 1, wherein the size of the third magnet is smaller than the size of the first magnet, and / or, The size of the third magnet is smaller than the size of the second magnet.

4. The driving device according to claim 1, wherein the first component is capable of moving clockwise or counterclockwise relative to the second component; The drive unit includes: The third detection element is disposed on the second component. The drive device includes a first state and a second state. In the first state, the first component is located at a first position relative to the second component. In the second state, the first component is located at a second position relative to the second component. In the first state, the magnetic field quantity detected by the first detection element is a first value, the magnetic field quantity detected by the second detection element is a second value, and the magnetic field quantity detected by the third detection element is a third value. The first value is the same as the second value, and the third value is different from the first value. In the second state, the magnetic quantity that the first detection element can detect is a fourth value, the magnetic quantity that the second detection element can detect is a fifth value, and the magnetic quantity that the third detection element can detect is a sixth value. The fourth value is the same as the fifth value, and the sixth value is different from the fifth value.

5. The driving device according to claim 4, wherein the difference between the first value and the fourth value is the first difference, the difference between the second value and the fifth value is the second difference, the difference between the third value and the sixth value is the third difference, the first difference is the same as the second difference, and the third difference is different from the first difference.

6. The driving device according to claim 1, wherein the target component comprises a first driving component, a second driving component, and a third driving component capable of releasing magnetism. The first driving element releases magnetism to affect the first magnet, the second driving element releases magnetism to affect the second magnet, and the third driving element releases magnetism to affect the third magnet. The size of the third driving component is smaller than the size of the first driving component, and / or, The size of the third driving component is smaller than the size of the second driving component.

7. The driving device according to claim 6, wherein the driving device includes a third state, in which the first driving member and the second driving member jointly release a first magnetism, the first magnetism being capable of driving the first magnet and the second magnet to move along a first direction; The third driving element releases a second magnetism, which drives the third magnet to move along a second direction, which is opposite to the first direction.

8. The driving device according to claim 1, further comprising at least one of the following: The second driving member and the third driving member can provide different maximum magnetic forces; The second driving element has the same maximum magnetic force as the first driving element; The orientations of the first magnet and the second magnet satisfy the perpendicular condition; The orientations of the first magnet and the third magnet satisfy opposite conditions; The orientations of the second magnet and the third magnet satisfy the perpendicular condition; The orientations of the first driving member and the second driving member satisfy the perpendicular condition; The orientations of the first driving member and the third driving member satisfy the perpendicular condition; The orientations of the second driving member and the third driving member satisfy opposite conditions.

9. An imaging device, comprising: A driving device includes: a first component, which has a first magnet, a second magnet, and a third magnet fixed relative to each other, the first magnet and the third magnet facing each other; a second component, which is movable relative to the second component, and has a target component that can release magnetism to move the magnets; a first detection component, disposed on the second component, which can detect changes in magnetism, the first detection component being at a first distance from the first magnet and at a second distance from the second magnet; a second detection component, disposed on the second component, which can detect changes in magnetism, the second detection component being at a third distance from the first magnet and at a fourth distance from the second magnet, the third distance being the same as the second distance and the fourth distance being the same as the first distance; and a fifth distance, which is greater than the third distance, between the third magnet and the second detection component. Imaging component, the imaging component being fixed relative to the first component, or The imaging component is fixed relative to the second component.

10. The imaging apparatus according to claim 9, comprising: A third component, in which the first component is nested; The fourth driving component is disposed on the third component; A fourth magnet is disposed on the first component, and the fourth driving member can release magnetism to act on the fourth magnet, so that the first component can extend and retract relative to the third component; A fourth detection element is disposed on the third component, and the fourth detection element is capable of detecting magnetic changes.

Images