Driving device and camera module

Abstract

This application discloses a driving device and a camera module, including: a base; a support assembly; a carrier having a light-transmitting hole extending along an optical axis, the carrier having a first corner and a second corner located diagonally opposite each other, the carrier being supported on the base by the support assembly at the first corner and the second corner; and a driving assembly for driving the carrier to move relative to the base along the optical axis, the driving assembly including a first driving part and a second driving part disposed on opposite sides of the carrier, the first driving part and the second driving part being disposed near the other two corners besides the first corner and the second corner.

Description

Technical Field

[0001] This application relates to the field of camera technology, and more particularly to a driving device and a camera module. Background Technology

[0002] With the widespread adoption of mobile electronic devices, the technologies related to camera modules used in these devices to help users capture images have developed and progressed rapidly. In the market, consumers have increasingly higher and more diverse functional requirements for camera modules configured in mobile electronic devices (e.g., smartphones).

[0003] Currently, common optical autofocus functions are mainly achieved by incorporating a drive mechanism within the camera module that moves optical lenses along the optical axis. Existing drive mechanisms, when implementing optical autofocus, often increase the device's size, which contradicts the trend towards thinner and lighter mobile devices.

[0004] As consumer demands increase, so do the requirements for drive units. For example, there is a need to reduce the lateral dimensions of drive units. Therefore, how to further reduce the size of drive units while meeting high performance has become an important direction for current technological development. Summary of the Invention

[0005] One objective of this application is to realize a small-sized optical focusing drive device and camera module.

[0006] Another objective of this application is that the driving device of this application can be applied to the front camera module of a mobile phone, so that the front camera module has optical focusing function while avoiding a significant increase in size.

[0007] To achieve the above objectives, the technical solution adopted in this application is: a driving device, comprising: Base; Support components; A carrier having a light-transmitting hole extending along an optical axis, the carrier having a first corner and a second corner located diagonally opposite each other, the carrier being supported by the support assembly at the first corner and the second corner on the base; and A driving assembly is used to drive the carrier to move relative to the base along the optical axis. The driving assembly includes a first driving part and a second driving part disposed on opposite sides of the carrier. The first driving part and the second driving part are respectively disposed near two other corners besides the first corner and the second corner.

[0008] As a preferred embodiment, the carrier further includes a first side and a second side located on both sides of the first corner, and a third side and a fourth side located on both sides of the second corner. The first driving part is disposed on the first side, and the second driving part is disposed on the third side. The first side and the third side are parallel to a second direction, and the second side and the fourth side are parallel to a first direction. The first direction and the second direction are perpendicular to each other and both are perpendicular to the optical axis. Along the second direction, the first driving part and the second driving part are offset.

[0009] As a preferred embodiment, the first driving unit includes a first magnet and a first coil disposed opposite to each other, the first magnet being disposed in one of the carrier or the base, and the first coil being disposed in the other of the carrier or the base; the second driving unit includes a second magnet and a second coil disposed opposite to each other, the second magnet being disposed in one of the carrier or the base, and the second coil being disposed in the other of the carrier or the base.

[0010] As a preferred embodiment, the support assembly includes a first guide member and a second guide member disposed on the base and extending along the optical axis. The first guide member is located at the first corner, and the second guide member is located at the second corner. The central axis of the first guide member along the optical axis and the central axis of the second guide member along the optical axis are connected to form a support surface. The support surface has a central axis along the optical axis, and the central axis of the support surface is equidistant from the first guide member and the second guide member. The first driving part and the second driving part are respectively located on both sides of the central axis of the support surface along the second direction.

[0011] As a preferred embodiment, the support assembly further includes a first magnetic element disposed at the first corner and a second magnetic element disposed at the second corner, wherein the first guide element is disposed opposite to the first magnetic element and the second guide element is disposed opposite to the second magnetic element.

[0012] As a preferred embodiment, the first magnetic element is located at the first corner near the second side of the carrier, and the second magnetic element is located at the second corner near the third side of the carrier.

[0013] As a preferred embodiment, the first guide member and the carrier have at least two contact positions spaced apart along the optical axis, the second guide member and the carrier have at least one contact position, the first magnetic member and the first guide member have a first magnetic attraction force, the second magnetic member and the second guide member have a second magnetic attraction force, and the size of the first magnetic member is larger than that of the second magnetic member, such that the first magnetic attraction force is greater than the second magnetic attraction force.

[0014] As a preferred embodiment, a first clearance hole is formed on the second side of the carrier facing the first magnetic component, and a second clearance hole is formed on the third side of the carrier facing the second magnetic component, so that the protruding portions of the first and second magnetic components can extend out of the first and second clearance holes; the base includes a sidewall surrounding the outer side of the carrier, and a first clearance opening is formed on the sidewall of the base opposite to the first clearance hole on the second side of the carrier. The size of the first clearance opening is larger than the size of the first clearance hole to accommodate the protruding portion of the carrier, and the portion of the second side of the carrier opposite to the first clearance opening protrudes outward to extend into the first clearance opening.

[0015] As a preferred embodiment, the base further includes a conductive portion, which is disposed around the four sides of the base, and a second clearance opening is formed at the position of the conductive portion opposite to the first clearance opening on the second side of the carrier.

[0016] As a preferred embodiment, on a plane perpendicular to the optical axis, the angle between the line connecting the geometric center of the second guide and the geometric center of the second magnetic element and the line connecting the geometric center of the second guide and the geometric center of the first guide is α, where α ≤ 90°.

[0017] As a preferred embodiment, the angle between the line connecting the geometric center of the first guide member and the geometric center of the first magnetic member and the line connecting the geometric center of the second guide member and the geometric center of the first guide member is β, where β ≥ 90°.

[0018] As a preferred embodiment, the first magnet is disposed on the first side of the carrier, the second magnet is disposed on the third side of the carrier, a position sensing magnet is disposed on the second side of the carrier, a position sensor is disposed on the base opposite to the position sensing magnet, and the vertical distance between the central axis of the light-transmitting hole and the fourth side is less than the vertical distance between the fourth side and the second side.

[0019] As a preferred embodiment, the carrier has a first contact surface and a second contact surface that are not coplanar at the first corner, the first guide member contacts the first contact surface and the second contact surface, the carrier has a third contact surface at the second corner, and the second guide member contacts the third contact surface; the central axis of the first guide member along the optical axis and the central axis of the second guide member along the optical axis are connected to form a support surface, the third contact surface is parallel to the support surface, the angle between the first contact surface and the support surface is θ1, the angle between the second contact surface and the support surface is θ2, θ1≠90°, θ2≠90°.

[0020] As a preferred embodiment, the first guide member and the carrier only contact the first contact surface and the second contact surface, and the first guide member and the first contact surface have two contact positions spaced apart along the optical axis direction, the first guide member and the second contact surface have two contact positions spaced apart along the optical axis direction, the second guide member and the carrier only contact the third contact surface, and the second guide member and the third contact surface have one contact position; θ1=θ2.

[0021] As a preferred embodiment, a camera module includes: Optical lens; A photosensitive component, disposed opposite to the optical lens along the optical axis, is used to receive light emitted from the optical lens to form an image of the subject; and As described in any of the above-described driving devices, the optical lens is held on the light-sensing path of the photosensitive component by the driving device, and the driving device is adapted to drive the optical lens to move along the optical axis to achieve optical performance adjustment.

[0022] Compared with the prior art, the beneficial effects of this application are as follows: (1) By optimizing the magnetic field distribution and current direction, the component force that is not conducive to the driving carrier generated during the operation of the driving device can be reduced, thereby reducing the risk of the carrier separating from the base and improving the stability of the camera module during active calibration.

[0023] (2) By optimizing the magnetic field distribution and current direction, a stronger driving force can be generated in a limited space without increasing the size of the magnet or coil, thereby reducing the overall size of the camera module.

[0024] (3) By optimizing the magnetic field distribution and current direction, energy loss can be reduced and energy conversion efficiency can be improved, thereby reducing energy consumption. Attached Figure Description

[0025] Figure 1A This is a three-dimensional schematic diagram of one embodiment of the camera module of this application.

[0026] Figure 1B This is an explosion diagram of one embodiment of the camera module of this application.

[0027] Figure 1C This is a cross-sectional schematic diagram of one embodiment of the camera module of this application.

[0028] Figure 2A This is a three-dimensional structural diagram of a driving device according to an embodiment of this application.

[0029] Figure 2BThis is a schematic diagram showing the contact position between the guide and the carrier in one embodiment of the driving device of this application.

[0030] Figure 3 This is a schematic diagram of the internal support component and the drive component in one embodiment of the drive device of this application.

[0031] Figure 4 This is a schematic diagram of the internal carrier structure in one embodiment of the driving device of this application.

[0032] Figure 5 This is a schematic diagram of the force analysis of the internal carrier in one embodiment of the driving device of this application.

[0033] Figure 6 This is a schematic diagram of the current direction of the internal coil in one embodiment of the driving device of this application.

[0034] Figure 7 This is a schematic diagram of the current direction of the internal coil in another embodiment of the driving device of this application.

[0035] Figure 8 This is a schematic diagram of the force component action of the internal carrier in one embodiment of the driving device of this application.

[0036] Figure 9 This is a schematic diagram of the force component of the internal carrier in another embodiment of the driving device of this application.

[0037] Figure 10 This is a schematic diagram showing the location of the internal driving components in one embodiment of the driving device of this application.

[0038] Figure 11 This is a schematic diagram showing the position of the guide section in one embodiment of the driving device of this application.

[0039] Figure 12 This is a schematic diagram of the magnetic attraction effect between the guide members in one embodiment of the driving device of this application.

[0040] Figure 13 This is a schematic diagram of the magnetic attraction effect between the guide members in another embodiment of the driving device of this application.

[0041] Figure 14 This is a schematic diagram showing the position of the second magnetic element in one embodiment of the driving device of this application.

[0042] Figure 15 This is a schematic diagram showing the position of an optical lens in one embodiment of this application.

[0043] Figure 16 This is a schematic diagram of the structure at the first corner A in one embodiment of the driving device of this application.

[0044] Figure 17 This is a schematic diagram showing the position of the fixed insert in one embodiment of the driving device of this application.

[0045] Figure 18 This is a schematic diagram showing the positions of the position sensor, the position sensing magnet, and the electrical discharge unit in one embodiment of the driving device of this application.

[0046] In the diagram: 1. Optical lens; 11. Lens barrel; 12. Optical lens; 2. Photosensitive assembly; 21. Photosensitive chip; 22. Filter element; 23. Support; 24. Circuit board; 25. Electronic component; 3. Drive device; 31. Top cover; 32. Base; 321. Side wall; 3211. First clearance opening; 33. Carrier; 331. First side; 332. Second side; 333. Third side; 334. Fourth side; 335. Light passage hole; 336. First guide part; 3361. First protrusion; 3362. Second protrusion; 337. Second guide part; 3371. Third protrusion; 338. First clearance hole; 339. Second clearance hole; 34. 341. Drive assembly; 341. First drive unit; 3411. First magnet; 3412. First coil; 342. Second drive unit; 3421. Second magnet; 3422. Second coil; 35. Support assembly; 351. First magnetic element; 352. Second magnetic element; 353. First guide element; 3531. First support position; 3532. Second support position; 354. Second guide element; 3541. Third support position; 36. Fixing insert; 37. Position sensor; 38. Position sensing magnet; 39. Conductive part; 391. Second clearance opening; 392. Electrical discharge part; 41. First contact surface; 42. Second contact surface; 43. Third contact surface. Detailed Implementation

[0047] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0048] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0049] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0050] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0051] In the accompanying drawings of this application, the X, Y, and Z axes are coordinate axes of a spatial rectangular coordinate system. The first direction mentioned below is parallel to the X-axis, the second direction is parallel to the Y-axis, and the third direction and the optical axis are parallel to the Z-axis. It should be understood that the optical axis direction of the driving device 3 is the same as the optical axis direction of the optical lens 1.

[0052] like Figure 1A-1C As shown, one embodiment of this application provides a driving device 3 for a camera module, which includes a base 32, a carrier 33 movably disposed in the base 32, and a driving component 34 for driving the carrier 33 to move relative to the base 32. The carrier 33 has a light-transmitting hole 335, and an optical lens 1 is mounted in the light-transmitting hole 335 of the carrier 33. The driving component 34 is used to drive the carrier 33 to move relative to the base 32 along the optical axis of the optical lens 1 to achieve optical focusing. The photosensitive component 2 of the camera module can be mounted on the base 32, and light rays are converged by the optical lens 1 and are suitable for incident on the photosensitive component 2 for imaging.

[0053] In this embodiment, the drive device 3 further includes an upper cover 31, which is adapted to engage with the base 32 to form a receiving cavity with the base 32, so as to protect other components of the drive device 3.

[0054] Furthermore, such as Figure 2A , Figure 2B and Figure 3 As shown, the drive device 3 also includes a support component 35. The carrier 33 has a first corner A and a second corner B located at opposite corners. The carrier 33 is supported on the base 32 by the support component 35 at the first corner A and the second corner B.

[0055] Furthermore, the support assembly 35 includes a first magnetic element 351 disposed at a first corner A of the carrier 33, and a second magnetic element 352 disposed at a second corner B. The support assembly 35 also includes a first guide element 353 and a second guide element 354 disposed on the base 32 and extending along the optical axis. The first guide element 353 is opposite to the first magnetic element 351, and the second guide element 354 is opposite to the second magnetic element 352. The magnetic force between the first magnetic element 351 and the first guide element 353, and the magnetic force between the second guide element 354 and the second magnetic element 352, are used to support the carrier 33 on the first guide element 353 and the second guide element 354. The carrier 33 and the base 32 clamp the first guide element 353 and the second guide element 354. The first guide element 353 and / or the second guide element 354 are used to limit and guide the displacement of the carrier 33, ensuring that the carrier 33 moves in the direction defined by the first guide element 353 and / or the second guide element 354. It is worth mentioning that, usually, guiding and limiting the carrier 33 can be achieved solely by relying on the first guide member 353 or the second guide member 354. If the first guide member 353 and the second guide member 354 simultaneously guide and limit the carrier 33, it will increase the precision requirements of the components and increase production costs. When the carrier 33 is subjected to the force of the drive component 34, the force of the drive component 34 overcomes the frictional force between the first guide member 353, the second guide member 354 and the carrier 33, and drives the carrier 33 to move up and down along the first guide member 353 and / or the second guide member 354.

[0056] Furthermore, the first guide 353 and the carrier 33 have at least two contact positions spaced apart, and the second guide 354 and the carrier 33 have at least one contact position. That is, the first guide 353 and the second guide 354 provide stable support to the carrier 33 at at least three non-collinear positions.

[0057] In some embodiments, such as Figure 2B As shown, the carrier 33 has a first contact surface 41 and a second contact surface 42 that are not coplanar at the first corner A. The first guide 353 contacts the first contact surface 41 and the second contact surface 42. The carrier 33 has a third contact surface 43 at the second corner B. The second guide 354 contacts the third contact surface 43. Preferably, the first guide 353 contacts the carrier 33 only at the first contact surface 41 and the second contact surface 42, and the second guide 354 contacts the carrier 33 only at the third contact surface 43. In this case, the first guide 353 mainly functions to limit and guide the carrier 33, while the second guide 354 mainly functions to support it.

[0058] The central axis of the first guide member 353 along the optical axis and the central axis of the second guide member 354 along the optical axis are connected to form a support surface. Alternatively, the central axes of the first guide member 353 and the second guide member 354 along the optical axis are parallel to each other and both lie within the support surface. It is understood that the support surface mentioned in this application is a virtual surface and does not specifically refer to any particular plane.

[0059] like Figure 2B As shown, the third contact surface 43 is parallel to the support surface, the first contact surface 41 forms an angle θ1 with the support surface, and the second contact surface 42 forms an angle θ2 with the support surface, where θ1 ≠ 90° and θ2 ≠ 90°. Preferably, θ1 = θ2. It should be understood that at the second corner B, since the third contact surface 43 is parallel to the support surface, the second guide 354 does not limit or guide the carrier 33. Therefore, the guidance of the carrier 33 is mainly achieved by the first guide 353 at the first corner A, which helps to reduce the accuracy requirements of the components.

[0060] In some embodiments, the first guide member 353 and the first contact surface 41 have two contact positions spaced apart along the optical axis, the first guide member 353 and the second contact surface 42 have two contact positions spaced apart along the optical axis, and the second guide member 354 and the third contact surface 43 have one contact position. That is, the first guide member 353 and the second guide member 354 form a relatively stable triangle for supporting the carrier 33, ensuring support stability.

[0061] In some embodiments, the surface of the first magnetic element 351 facing the first guide element 353 and the surface of the second magnetic element 352 facing the second guide element 354 are parallel to the support surface, so that the first magnetic attraction force and the second magnetic attraction force are perpendicular to the support surface, further reducing the risk of the carrier 33 rotating relative to the base 32. The surface of the second magnetic element 352 facing the second guide element 354 is parallel to the third contact surface 43, and the included angles between the surface of the first magnetic element 351 facing the first guide element 353 and the first contact surface 41 and the second contact surface 42 are both acute angles.

[0062] In some embodiments, the first guide 353 and the second guide 354 are respectively implemented as guide rods, and the first guide 353 and the second guide 354 are fixed to the base 32, thereby the carrier 33 moves along the guiding direction of the first guide 353 and / or the second guide 354.

[0063] In some embodiments, the first magnetic element 351 and the second magnetic element 352 may be implemented as magnets, while the first guide element 353 and the second guide element 354 may be implemented as iron-containing materials suitable for being attracted by magnets. The materials of the guide elements may be set according to specific circumstances, and this application does not limit them.

[0064] In other embodiments, magnetic yoke elements are respectively provided on the side of the first guide member 353 and the second guide member 354 opposite to the first magnetic member 351 and the second magnetic member 352. The magnetic attraction between the magnetic yoke elements on the guide members and each magnetic member is used to support the carrier 33.

[0065] like Figure 3 As shown, the drive assembly 34 includes a first drive portion 341 and a second drive portion 342 disposed on opposite sides of the carrier 33. The first drive portion 341 and the second drive portion 342 apply forces to the carrier 33 from opposite sides of the carrier 33 to drive the carrier 33 to move.

[0066] like Figure 4 As shown, the carrier 33 includes a first side surface 331 and a second side surface 332 located on both sides of the first corner A, and a third side surface 333 and a fourth side surface 334 located on both sides of the second corner B. The first side surface 331 and the fourth side surface 334 are adjacent, and the second side surface 332 and the third side surface 333 are adjacent. A first driving part 341 is disposed on the first side surface 331, and a second driving part 342 is disposed on the third side surface 333. The first side surface 331 and the third side surface 333 are parallel to the second direction, and the second side surface 332 and the fourth side surface 334 are parallel to the first direction. The first direction and the second direction are perpendicular to each other and both are perpendicular to the optical axis. Along the second direction, the first driving part 341 and the second driving part 342 are staggered. Since the support components 35 are already provided at the two corners of the carrier 33, this application sets the first driving part 341 and the second driving part 342 close to the other two corners, so that the first driving part 341 and the second driving part 342 are staggered, thereby making full use of the space on the sides of the carrier 33, which is conducive to miniaturization of the driving device 3.

[0067] In the prior art, to ensure that the first driving part 341 and the second driving part 342 can stably drive the carrier 33 to move, the first driving part 341 and the second driving part 342 are usually symmetrically arranged on both sides of the carrier 33, and the center line connecting the first driving part 341 and the second driving part 342 passes through the optical axis. However, in the solution of this application, if the first driving part 341 and the second driving part 342 are arranged according to the existing solution, it is necessary to either reduce the size of the first driving part 341 and the second driving part 342 along the second direction, or increase the size of the carrier 33 along the second direction to ensure the symmetry of the first driving part 341 and the second driving part 342. However, reducing the size of the first driving part 341 and the second driving part 342 will affect the magnitude of the driving force, while increasing the size of the carrier 33 contradicts the pursuit of miniaturization. Based on this, this application proposes to stagger the first driving part 341 and the second driving part 342, and make full use of the space of the carrier 33 to reasonably arrange the first driving part 341 and the second driving part 342 without reducing the size of the driving part or increasing the size of the carrier 33.

[0068] In some embodiments, the driving component 34 is a voice coil motor. The first driving unit 341 includes a first magnet 3411 and a first coil 3412 disposed opposite to each other. The first magnet 3411 is disposed on one of the carrier 33 or the base 32, and the first coil 3412 is disposed on the other of the carrier 33 or the base 32. The second driving unit 342 includes a second magnet 3421 and a second coil 3422 disposed opposite to each other. The second magnet 3421 is disposed on one of the carrier 33 or the base 32, and the second coil 3422 is disposed on the other of the carrier 33 or the base 32. The first coil 3412 and the first magnet 3411 are disposed opposite to each other in a direction perpendicular to the optical axis, and the second coil 3422 and the second magnet 3421 are also disposed opposite to each other in a direction perpendicular to the optical axis. The first magnet 3411 and the second magnet 3421 are fixed to two opposite sides of the carrier 33, and the first coil 3412 and the second coil 3422 are fixed to two opposite sides of the base 32. When the first coil 3412 and the second coil 3422 are energized, they drive the first magnet 3411, the second magnet 3421, and the carrier 33 to move along the optical axis. Preferably, the first magnet 3411 is disposed on the first side 331 and close to the fourth side 334, and the second magnet 3421 is disposed on the third side 333 and close to the second side 332; that is, along the second direction, the first magnet 3411 and the second magnet 3421 are staggered.

[0069] When the first coil 3412 is energized, excluding the driving force along the optical axis, a first force F1 exists between the first magnet 3411 and the first coil 3412 along their relative orientation. This first force F1 may be a magnetic attraction or repulsion force, depending on the energizing direction of the first coil 3412. Similarly, when the second coil 3422 is energized, excluding the driving force along the optical axis, a second force F2 exists between the second magnet 3421 and the second coil 3422 along their relative orientation. This second force F2 may be a magnetic attraction or repulsion force, depending on the energizing direction of the second coil 3422. It should be understood that the first force F1 and the second force F2 are redundant forces not used to drive the carrier 33, and they will have an adverse effect on the operation of the driving device 3, requiring elimination. When the first force F1 and the second force F2 are in opposite directions, the component force F parallel to the support surface... 12 and F 22 The components of the force F perpendicular to the supporting surface can cancel each other out. 11 and F 21 They cannot completely offset each other, such as Figure 5 As shown in the figure, the diagonal line in the middle represents the support surface formed by connecting the central axis of the first guide 353 along the optical axis and the central axis of the second guide 354 along the optical axis. The component force perpendicular to the support surface is beneficial to reducing the force required for the carrier 33 to separate from the base 32. Therefore, the existence of this pair of component forces helps to reduce the magnetic attraction force required for the first magnetic component 351 and the second magnetic component 352, so the size of the first magnetic component 351 and the second magnetic component 352 can be designed to be smaller, thereby reducing the overall size of the module.

[0070] In one embodiment, along the optical axis, the magnetic pole distribution of the first magnet 3411 facing the first coil 3412 is the same as that of the second magnet 3421 facing the second coil 3422. When the driving assembly 34 is working, when viewed along a direction perpendicular to the optical axis, the current directions in the first coil 3412 and the second coil 3422 are opposite, thus the directions of the first force F1 and the second force F2 are opposite, and the component force F parallel to the support surface is... 12 and F 22 They can cancel each other out.

[0071] like Figure 6As shown, when viewed along the first direction, the current direction on the side above the first coil 3412 is A1, and the current direction on the side above the second coil 3422 is A2. The current directions A1 and A2 of the first coil 3412 and the second coil 3422 are opposite. The magnetic pole distribution of the first magnet 3411 facing the first coil 3412 is the same as that of the second magnet 3421 facing the second coil 3422. That is, along the Z-axis, the upper magnetic pole of the first magnet 3411 facing the first coil 3412 is N, and the lower magnetic pole is S; the upper magnetic pole of the second magnet 3421 facing the second coil 3422 is N, and the lower magnetic pole is S; or, the upper magnetic pole of the first magnet 3411 facing the first coil 3412 is S, and the lower magnetic pole is N; the upper magnetic pole of the second magnet 3421 facing the second coil 3422 is S, and the lower magnetic pole is N. It is understandable that the above configuration can either make the first driving unit 341 and the second driving unit 342 generate the same driving force along the optical axis, or make the first force F1 and the second force F2 have opposite directions, thereby at least partially eliminating the excess force of the first force F1 and the second force F2 that is not used to drive the carrier 33, and improving the stability of the operation of the driving device 3.

[0072] In another embodiment, along the optical axis, the magnetic pole distribution of the first magnet 3411 facing the first coil 3412 is opposite to that of the second magnet 3421 facing the second coil 3422. When the driving assembly 34 is working, viewed along a direction perpendicular to the optical axis, the current directions in the first coil 3412 and the second coil 3422 are the same, thus the directions of the first force F1 and the second force F2 are opposite, and the component force F parallel to the support surface is... 12 and F 22 They can cancel each other out.

[0073] like Figure 7As shown, when viewed along the first direction, the current directions A1 and A2 of the first coil 3412 and the second coil 3422 are the same; the magnetic pole distribution of the first magnet 3411 facing the first coil 3412 is opposite to that of the second magnet 3421 facing the second coil 3422. Along the Z-axis, the upper magnetic pole of the first magnet 3411 facing the first coil 3412 is N, and the lower magnetic pole is S; the upper magnetic pole of the second magnet 3421 facing the second coil 3422 is S, and the lower magnetic pole is N; or, the upper magnetic pole of the first magnet 3411 facing the first coil 3412 is S, and the lower magnetic pole is N; the upper magnetic pole of the second magnet 3421 facing the second coil 3422 is N, and the lower magnetic pole is S. The above configuration can also make the first driving part 341 and the second driving part 342 generate the same driving force along the optical axis, and can also make the first force F1 between the first coil 3412 and the first magnet 3411 and the second force F2 between the second coil 3422 and the second magnet 3421 have opposite directions, thereby eliminating the unnecessary force of the first force F1 and the second force F2 that is not used to drive the carrier 33, and improving the stability of the operation of the driving device 3.

[0074] It is understandable that, since the carrier 33 will be driven upward or downward along the optical axis relative to the base 32 to achieve different focusing requirements, the first coil 3412 and the second coil 3422 will carry forward current or reverse current when the same driving direction is required. After the current direction is reversed, the first force F1 and the second force F2 will also be reversed. However, as long as the first force F1 and the second force F2 are kept in opposite directions, part of the force will be canceled out.

[0075] Furthermore, in order to make the component force F 11 and component force F 21 The effects can be offset as much as possible, requiring the component force F to be minimized. 11 and component force F 21 The lever arm lengths are close. In this application, the first driving part 341 (first coil 3412 and first magnet 3411) and the second driving part 342 (second coil 3422 and second magnet 3421) located on both sides of the driving device 3 are offset by approximately the same distance to both sides, so that the lengths of the two lever arms can be relatively close.

[0076] In some embodiments, such as Figure 8As shown, the diagonal line in the middle of the figure represents the support surface formed by connecting the central axis of the first guide member 353 along the optical axis and the central axis of the second guide member 354 along the optical axis. The support surface has a central axis along the optical axis, and the perpendicular distance between the central axis of the support surface and the central axis of the first guide member 353 and the central axis of the second guide member 354 is equal. When both the first driving part 341 and the second driving part 342 are close to the second side surface 332, that is, when the first driving part 341 and the second driving part 342 are respectively located on the same side of the central axis of the support surface along the second direction, the distance D1 from the center of the first magnet 3411 to the support surface and the distance D2 from the center of the second magnet 3421 to the support surface have a significant difference. In this case, the first component force F is obviously... 11 Second component force F 21 The two lever arms have significantly different lengths, thus the first component force F 11 Second component force F 21 The torques will also differ significantly, resulting in a smaller portion of the effects of the two component forces being canceled out.

[0077] In some embodiments, such as Figure 9 As shown, the diagonal line in the middle of the figure represents the support surface formed by connecting the central axis of the first guide member 353 along the optical axis and the central axis of the second guide member 354 along the optical axis. The support surface has a central axis along the optical axis, and the perpendicular distance between the central axis of the support surface and the central axis of the first guide member 353 and the central axis of the second guide member 354 is equal. When the first driving part 341 is close to the fourth side surface 334 and the second driving part 342 is close to the second side surface 332, that is, when the first driving part 341 and the second driving part 342 are respectively located on both sides of the central axis of the support surface along the second direction, the first component force F is obviously... 11 Second component force F 21 The lever arms will be closer to or even equal, thus the first component force F 11 Second component force F 21 The torques will be close to or even equal, thus the adverse effects of the two component forces can be better canceled out. It should be understood that the first drive unit 341 and the second drive unit 342 are located on both sides of the central axis of the support surface along the second direction, meaning that the central part of the first drive unit 341 and the central part of the second drive unit 342 are located on both sides of the central axis of the support surface along the second direction.

[0078] It is understandable that, such as Figure 10 As shown, along the Y-axis, this application positions the first drive unit 341 away from the first corner A and the second drive unit 342 away from the second corner B, which helps to make the first component force F 11 Second component force F 21The effect of the support component 35 is further offset, which further optimizes the space in the drive unit 3, allowing the support component 35 to have more room in the drive unit 3, thereby enabling further compression of the size of the drive unit 3 along the Y-axis.

[0079] Furthermore, such as Figure 11 , Figure 12 and Figure 13 As shown, the carrier 33 has a first guide portion 336 extending along the Z-axis direction corresponding to the first guide member 353, and a second guide portion 337 extending along the Z-axis direction corresponding to the second guide member 354. The first guide portion 336 has a first protrusion 3361 and a second protrusion 3362, and the first guide member 353 has a first support position 3531 and a second support position 3532 corresponding to the positions of the first protrusion 3361 and the second protrusion 3362. The second guide portion 337 has a third protrusion 3371, and the second guide member 354 has a third support position 3541 corresponding to the position of the third protrusion 3371. Thus, along the Z-axis direction, the first guide member 353 and the second guide member 354 form a stable triangular support for the carrier 33, achieving a stable supporting effect for the carrier 33.

[0080] To further miniaturize the drive device 3, its height needs to be reduced along the Z-axis. Therefore, the heights of the first guide member 353 and the second guide member 354 along the Z-axis need to be reduced simultaneously. Since the first magnetic member 351 and the first guide member 353 generate a first magnetic attraction force, and the second magnetic member 352 and the second guide member 354 generate a second magnetic attraction force, when the first magnetic attraction force equals the second magnetic attraction force, such as... Figure 12 As shown, the center of the resultant force of the first magnetic attraction and the second magnetic attraction, that is, the position marked by the circle in the figure, is exactly between the first guide 353 and the second guide 354. Figure 13 As shown, when the distance between the first protrusion 3361 and the second protrusion 3362 of the first guide portion 336 decreases, the distance between the first support position 3531 and the second support position 3532 on the first guide member 353 also shortens, which will cause... Figure 12 The triangle shown by the dashed line becomes Figure 13 The more elongated triangle shown makes the combined force of the first and second magnetic attraction forces closer to the top and bottom sides of the triangle, meaning the support of the carrier 33 on the base 32 will be unstable. Therefore, this application proposes to shift the position of the combined force of the first and second magnetic attraction forces of the driving device 3 towards one side of the first guide member 353, so that the center of the combined force of the first and second magnetic attraction forces (i.e., Figure 13 The position marked by the triangle in the middle is biased to one side of the first guide 353, thereby improving the stability of the carrier 33.

[0081] Specifically, the size of the first magnetic element 351 is larger than that of the second magnetic element 352, so that the first magnetic attraction force is greater than the second magnetic attraction force, and the resultant force of the first magnetic attraction force and the second magnetic attraction force is biased towards the first guide element 353 to improve the support stability of the carrier 33 on the base 32.

[0082] In some embodiments, the magnetic attraction force of the first magnetic element 351 is 20mN~25mN, and the magnetic attraction force of the second magnetic element 352 is 10mN~15mN, so as to ensure that the resultant force of the first magnetic attraction force and the second magnetic attraction force is biased towards the first guide element 353.

[0083] In some embodiments, such as Figure 14 As shown, on a plane perpendicular to the optical axis, the angle between the line connecting the geometric center of the second guide 354 and the geometric center of the second magnetic member 352 and the line connecting the geometric center of the second guide 354 and the geometric center of the first guide 353 is α, where α ≤ 90°. Preferably, α < 90°, that is, the second magnetic member 352 is located on the side of the second guide 354 closer to the first guide 353, thereby shifting the direction of the magnetic attraction force towards the first guide 353 and improving the stability of the guide support carrier 33 on the base 32.

[0084] In some embodiments, on a plane perpendicular to the optical axis, the angle between the geometric center of the first guide 353 and the geometric center of the first magnetic element 351 and the line connecting the geometric center of the second guide 354 and the geometric center of the first guide 353 is β, where β ≥ 90°, thereby causing the direction of the magnetic attraction force to shift towards the first guide 353, improving the stability of the guide support carrier 33 on the base 32.

[0085] In some embodiments, such as Figure 15 As shown, the first magnetic component 351 is located at the first corner A near the second side 332 of the carrier 33. Since the second side 332 of the carrier 33 does not have a driving part, placing the relatively large first magnetic component 351 close to the second side 332 allows for more space on the first side 331 to accommodate the first driving part 341. The second magnetic component 352 is located at the second corner B near the third side 333 of the carrier 33. Because the second magnetic component 352 is relatively small, placing it close to the third side 333 effectively reduces the required wall thickness of the fourth side 334, thus reducing the overall size. At this point, the fourth side 334 of the carrier 33 has more space, allowing the carrier 33 to be offset closer to the fourth side 334, further optimizing the internal space of the driving device 3, making the internal component design more compact, and further reducing the overall size of the driving device 3.

[0086] like Figure 15As shown, the vertical distance H1 between the central axis of the light-transmitting hole 335 of the carrier 33 and the fourth side surface 334 of the carrier 33 is less than the vertical distance H2 between the light-transmitting hole 335 and the second side surface 332. Since the driving device 3 of this application does not have a driving magnet or driving coil near the fourth side surface 334 of the carrier 33, the fourth side surface 334 of the carrier 33 can be designed to be narrower. As a result, the central axis of the light-transmitting hole 335 of the carrier 33 is biased toward the fourth side surface 334, and the optical lens 1 also shifts toward the fourth side surface 334 along with the carrier 33. This can further reduce the overall size of the driving device 3 without affecting its function.

[0087] like Figure 16 As shown, a first clearance hole 338 is formed at the position of the second side 332 of the carrier 33 facing the first magnetic element 351, and a second clearance hole 339 is formed at the position of the third side 333 of the carrier 33 facing the second magnetic element 352. This allows the protruding portions of the first magnetic element 351 and the second magnetic element 352 to extend out of the first clearance hole 338 and the second clearance hole 339, thereby avoiding unnecessary increase in the size of the carrier 33 along the first and second directions and reducing the overall size of the drive device 3.

[0088] Furthermore, such as Figure 16 As shown, since the size of the first magnetic element 351 in this application is larger than that of the second magnetic element 352, the base 32 includes a sidewall 321 surrounding the outer side of the carrier 33. A first clearance opening 3211 is formed at the position opposite to the first clearance hole 338 of the second side surface 332 of the carrier 33. The size of the first clearance opening 3211 is larger than that of the first clearance hole 338, so as to fully accommodate the portion of the carrier 33 that protrudes as the size of the first magnetic element 351 increases. The portion of the second side surface 332 of the carrier 33 that is opposite to the first clearance opening 3211 protrudes outward to extend into the first clearance opening 3211, thereby further obtaining a larger space for accommodating the first magnetic element 351 and reducing the overall size of the drive device 3.

[0089] Furthermore, such as Figure 16 As shown, the base 32 also includes a conductive part 39, which is arranged around the four sides of the base 32. The conductive part 39 forms a second clearance opening 391 at the position opposite to the first clearance opening 3211 of the second side 332 of the carrier 33, so that the first magnetic component 351 has a larger accommodating space and further reduces the overall size of the drive device 3.

[0090] In some embodiments, such as Figure 17As shown, the drive device 3 also includes a fixing insert 36, which is embedded in the base 32, with the connecting portion corresponding to the first guide 353 and the second guide 354 protruding from the base 32. The fixing insert 36 is used to fix the first guide 353 and the second guide 354, ensuring that the first guide 353 and the second guide 354 remain stable during optical focusing motion, reducing vibration and shaking, and improving the smoothness of the carrier 33's movement.

[0091] In some embodiments, the sides of the first guide 353 and the second guide 354 are respectively fixed to the side wall 321 of the base 32 by adhesive, and the bottom surfaces of the first guide 353 and the second guide 354 can be fixed to the fixing insert 36 by adhesive or welding, which effectively improves the connection reliability between the base 32 and the guide and reduces failures caused by loose connection.

[0092] In some embodiments, the first guide 353 and the second guide 354 may not be fixed, but may be directly clamped between the carrier 33 and the base 32, which facilitates quick installation and removal of the guides and improves work efficiency.

[0093] Furthermore, such as Figure 18 As shown, the drive device 3 also includes a position sensor 37 and a position sensing magnet 38. The position sensing magnet 38 is fixed to the carrier 33, and the position sensor 37 is fixed to the base 32 and is opposite to the position sensing magnet 38. The position sensor 37 is used to obtain the position change information of the position sensing magnet 38 relative to the base 32, thereby obtaining the position change information of the carrier 33 relative to the base 32.

[0094] Furthermore, the position sensing magnet 38 is disposed on the side where neither the first magnet 3411 nor the second magnet 3421 is disposed. It should be understood that independently disposing of the position sensing magnet 38 reduces the requirements for other magnets and related components that may be reused. Using the first magnet 3411 or the second magnet 3421 as the position sensing magnet 38 requires the first magnet 3411 or the second magnet 3421 to reserve space opposite to the position sensor 37, and also requires the first coil 3412 and the second coil 3422 to provide space for the placement of the position sensing magnet 38. Therefore, disposing of the position sensing magnet 38 on the side where neither the first magnet 3411 nor the second magnet 3421 is disposed further reduces the space utilization of the drive device 3 along the first direction, helping to reduce the overall size of the drive device 3. Preferably, the position sensing magnet 38 is disposed on the second side 332 of the carrier 33. The second side 332 of the carrier 33 is adapted to be recessed to form a groove to accommodate the position sensing magnet 38, thereby avoiding an increase in the size of the drive device 3.

[0095] In some embodiments, the first coil 3412, the second coil 3422, and the position sensor 37 are all electrically connected to the conductive part 39, and are electrically connected to the photosensitive component 2 through the conductive part 39.

[0096] In some embodiments, the conductive part 39 is implemented as a circuit board, fixed to the outer periphery of the base 32, and the conductive part 39 is arranged around the four outer periphery of the base 32. Specifically, the base 32 has an opening corresponding to the first coil 3412, the second coil 3422, and the position sensor 37, respectively. The first coil 3412, the second coil 3422, and the position sensor 37 pass through the opening and are fixed and electrically connected to the conductive part 39, so that the first coil 3412, the second coil 3422, and the position sensor 37 are fixed to the base 32 through the conductive part 39.

[0097] In some embodiments, the conductive portion 39 includes an electrical discharge portion 392, which is used for electrical connection with the photosensitive component 2 of the camera module.

[0098] Furthermore, such as Figure 1C As shown, this application also provides a camera module having the aforementioned driving device 3. The camera module includes an optical lens 1, a driving device 3, and a photosensitive component 2. The optical lens 1 is held in the light-sensing path of the photosensitive component 2 by the driving device 3. The photosensitive component 2 receives the light emitted from the optical lens 1 to form an image of the subject. The driving device 3 is adapted to drive the optical lens 1 to move to adjust its optical performance.

[0099] Furthermore, the optical lens 1 has an optical axis, the direction of which is parallel to the Z-axis of the camera module along the height direction, and the photosensitive component 2 is disposed opposite to the optical lens 1 along the optical axis.

[0100] In some embodiments, the optical lens 1 includes a lens barrel 11 and at least one optical lens 12 mounted in the lens barrel 11, the at least one optical lens 12 being disposed in the lens barrel 11 along the optical axis. The optical lens 1 is mounted on the carrier 33 of the driving device 3 via the lens barrel 11.

[0101] In some embodiments, the lens barrel 11 and the carrier 33 of the optical lens 1 are integrally formed, which is equivalent to at least one lens being directly mounted in the carrier 33 which has the function of the lens barrel 11, and can further reduce the lateral dimensions of the driving device 3 in the width and length directions.

[0102] Furthermore, the photosensitive component 2 includes an imaging circuit board 24, a photosensitive chip 21 electrically connected to the imaging circuit board 24, and at least one electronic component 25. The photosensitive chip 21 is used to receive light reflected from the subject captured by the optical lens 1 for imaging and is electrically connected to other electronic devices via the imaging circuit board 24. The electronic component 25 can be one or more passive electronic devices such as resistors and capacitors, or one or more active electronic devices such as driver chips and memory chips.

[0103] In some embodiments, the photosensitive assembly 2 includes a filter element 22, which is held in the photosensitive path of the photosensitive chip 21 to filter the imaging light incident on the photosensitive chip 21, removing unwanted light such as infrared light. Further, the photosensitive assembly 2 also includes a bracket 23, on which the filter element 22 is mounted. The bracket 23 is fixed to the imaging circuit board 24, thereby fixing the filter element 22 to the imaging circuit board 24 via the bracket 23.

[0104] In some embodiments, the driving device 3 can be fixed to the photosensitive component 2 by fixing it to the bracket 23. The bracket 23 transmits stress, which can prevent the photosensitive component 2 from directly bearing the impact force of the driving device 3. In other embodiments, the driving device 3 can also be fixed to the photosensitive component 2 by fixing it to the imaging circuit board 24. In this case, the bracket 23 is recessed relative to the edge of the imaging circuit board 24 to provide a fixed position for the driving device 3, reducing the space occupied by the bracket 23 and making the entire device more compact.

[0105] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A driving device, characterized in that, include: Base; Support components; The carrier has a light-transmitting hole extending along the optical axis, and the carrier has a first corner and a second corner located diagonally opposite each other. The carrier is supported on the base by the support assembly at the first corner and the second corner. as well as A driving assembly is used to drive the carrier to move relative to the base along the optical axis. The driving assembly includes a first driving part and a second driving part disposed on opposite sides of the carrier. The first driving part and the second driving part are respectively disposed near two other corners besides the first corner and the second corner.

2. The driving device according to claim 1, characterized in that, The carrier further includes a first side and a second side located on both sides of the first corner, and a third side and a fourth side located on both sides of the second corner. The first driving part is disposed on the first side, and the second driving part is disposed on the third side. The first side and the third side are parallel to a second direction, and the second side and the fourth side are parallel to a first direction. The first direction and the second direction are perpendicular to each other and both are perpendicular to the optical axis. Along the second direction, the first driving part and the second driving part are offset.

3. The driving device according to claim 2, characterized in that, The first driving unit includes a first magnet and a first coil disposed opposite to each other, the first magnet being disposed in one of the carrier or the base, and the first coil being disposed in the other of the carrier or the base; the second driving unit includes a second magnet and a second coil disposed opposite to each other, the second magnet being disposed in one of the carrier or the base, and the second coil being disposed in the other of the carrier or the base.

4. The driving device according to claim 2, characterized in that, The support assembly includes a first guide and a second guide disposed on the base and extending along the optical axis. The first guide is located at the first corner, and the second guide is located at the second corner. The central axis of the first guide along the optical axis and the central axis of the second guide along the optical axis are connected to form a support surface. The support surface has a central axis along the optical axis. The central axis of the support surface is equidistant from the first guide and the second guide. The first driving part and the second driving part are respectively located on both sides of the central axis of the support surface along the second direction.

5. The driving device according to claim 4, characterized in that, The support assembly further includes a first magnetic element disposed at the first corner and a second magnetic element disposed at the second corner, wherein the first guide element is disposed opposite to the first magnetic element and the second guide element is disposed opposite to the second magnetic element.

6. The driving device according to claim 5, characterized in that, The first magnetic element is located at the first corner near the second side of the carrier, and the second magnetic element is located at the second corner near the third side of the carrier.

7. The driving device according to claim 5, characterized in that, The first guide member and the carrier have at least two contact positions spaced apart along the optical axis, the second guide member and the carrier have at least one contact position, the first magnetic member and the first guide member have a first magnetic attraction force, the second magnetic member and the second guide member have a second magnetic attraction force, and the size of the first magnetic member is larger than that of the second magnetic member, such that the first magnetic attraction force is greater than the second magnetic attraction force.

8. The driving device according to claim 7, characterized in that, A first clearance hole is formed on the second side of the carrier facing the first magnetic component, and a second clearance hole is formed on the third side of the carrier facing the second magnetic component, so that the protruding portions of the first magnetic component and the second magnetic component can extend out of the first clearance hole and the second clearance hole; the base includes a sidewall surrounding the outer side of the carrier, and a first clearance opening is formed on the sidewall of the base opposite to the first clearance hole on the second side of the carrier. The size of the first clearance opening is larger than the size of the first clearance hole to accommodate the protruding portion of the carrier, and the portion of the second side of the carrier opposite to the first clearance opening protrudes outward to extend into the first clearance opening.

9. The driving device according to claim 8, characterized in that, The base also includes a conductive part, which is arranged around the four sides of the base. A second clearance opening is formed at the position of the conductive part opposite to the first clearance opening on the second side of the carrier.

10. The driving device according to claim 5 or 7, characterized in that, On a plane perpendicular to the optical axis, the angle between the line connecting the geometric center of the second guide and the geometric center of the second magnetic component and the line connecting the geometric center of the second guide and the geometric center of the first guide is α, where α ≤ 90°.

11. The driving device according to claim 5 or 7, characterized in that, The angle between the line connecting the geometric center of the first guide element and the geometric center of the first magnetic element and the line connecting the geometric center of the second guide element and the geometric center of the first guide element is β, where β ≥ 90°.

12. The driving device according to claim 3, characterized in that, The first magnet is disposed on the first side of the carrier, the second magnet is disposed on the third side of the carrier, the second side of the carrier is disposed on the position sensing magnet, and the base is disposed on the position sensing magnet opposite to the position sensing magnet. The vertical distance between the central axis of the light-transmitting hole and the fourth side is less than the vertical distance between the fourth side and the second side.

13. The driving device according to claim 4, characterized in that, The carrier has a first contact surface and a second contact surface that are not coplanar at the first corner. The first guide member contacts the first contact surface and the second contact surface. The carrier has a third contact surface at the second corner. The second guide member contacts the third contact surface. The central axis of the first guide member along the optical axis and the central axis of the second guide member along the optical axis are connected to form a support surface. The third contact surface is parallel to the support surface. The angle between the first contact surface and the support surface is θ1, and the angle between the second contact surface and the support surface is θ2. θ1≠90°, θ2≠90°.

14. The driving device according to claim 13, characterized in that, The first guide member and the carrier only contact each other on the first contact surface and the second contact surface. The first guide member and the first contact surface have two contact positions spaced apart along the optical axis. The first guide member and the second contact surface have two contact positions spaced apart along the optical axis. The second guide member and the carrier only contact each other on the third contact surface. The second guide member and the third contact surface have one contact position. θ1=θ2.

15. A camera module, characterized in that, include: Optical lens; A photosensitive component is disposed opposite to the optical lens along the optical axis and is used to receive the light emitted from the optical lens to form an image of the subject. as well as According to any one of claims 1-14, the optical lens is held on the light-sensing path of the photosensitive component by the driving device, and the driving device is adapted to drive the optical lens to move along the optical axis to achieve optical performance adjustment.

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