Low-height large-thrust OIS motor structure

Abstract

The utility model relates to a low-height large-thrust OIS motor structure, which comprises a shell, a first bracket, a second bracket and a movable part, a layered nested support structure is adopted, AF and OIS movement is decoupled through a first support and a second support, and efficient driving and large thrust in the optical axis direction and the direction perpendicular to the optical axis are achieved in combination with a Halbach magnetic array and a Hall sensor. The compression height is designed for single-layer ball driving and local contact pieces, and meanwhile a magnetic circuit is optimized through a magnetic conductive sheet. And the ball guide piece and the double limiting grooves ensure the movement precision.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging, and in particular to a low-height, high-thrust OIS motor structure. Background Technology

[0002] As consumers' demand for mobile phone photography increases, the functions of mobile phone cameras (i.e., camera modules) are becoming more and more abundant. Features such as portrait shooting, telephoto shooting, optical zoom, and optical image stabilization are all integrated into cameras with limited space. Among them, autofocus and optical image stabilization often rely on optical actuators (or motors) to achieve these functions.

[0003] Autofocus (AF) works by utilizing the principle of light reflection from an object. The reflected light is received by the camera's CCD sensor, processed by a computer, and then drives the motorized focusing mechanism to achieve focus. Optical image stabilization (IOS) refers to the use of optical components, such as lens settings, in cameras or other similar imaging instruments to avoid or reduce camera shake during the capture of optical signals, thereby improving image quality. IOS uses special lens or CCD sensor structures to minimize image instability caused by operator movement.

[0004] As the image quality requirements for mobile phone camera modules become increasingly demanding, the size and weight of lenses are also increasing, placing greater demands on the driving force of motors. However, current electronic devices (such as mobile phones) are subject to significant size constraints on camera modules, and the motor's footprint increases accordingly with the lens's size. In other words, while lenses are trending towards larger size and greater weight, the driving force provided by the motor cannot be increased accordingly. With limited driving force, a heavier lens results in a shorter distance the motor can move the lens, affecting focusing and image stabilization capabilities. Furthermore, a heavier lens means a slower speed at which the motor can move the lens, and a longer time for the lens to reach the predetermined compensation position, which also affects focusing and image stabilization performance. Additionally, it leads to a more complex motor mechanism, an increased number of parts, and a tendency for the overall thickness of the device to increase. Typically, the height of the camera aligns with the thickness of the mobile terminal, meaning the camera's height directly impacts the terminal's thickness. With the increasing miniaturization requirements of mobile devices, researchers have been dedicated to reducing the height of cameras to achieve a reduction in the thickness of mobile terminals, especially for cameras with image stabilization capabilities.

[0005] As mobile devices become increasingly smaller, the density of internal components in motors also increases. Motors contain magnets and coils to generate the magnetic field necessary to move the lens. This magnetic force drives the lens, enabling optical focusing and image stabilization. When two magnets in the motor are too close (less than 7mm), their internal magnetic fields interfere with each other, causing magnet displacement or vibration, affecting lens focusing and image quality. Simultaneously, the magnets are easily attracted and interfered with by nearby magnets. Utility Model Content

[0006] To address the aforementioned problems in the prior art, this utility model provides a low-height, high-thrust OIS motor structure.

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] A low-height, high-thrust OIS motor structure includes:

[0009] The shell has a hollow cavity formed inside it;

[0010] The first support is set inside the hollow cavity and can move along the optical axis.

[0011] The second support is set inside the first support and can move perpendicular to the optical axis.

[0012] A movable part is provided between the second bracket and the first bracket; the movable part is configured to allow the second bracket to move in a direction perpendicular to the optical axis; the first bracket is provided with a first sliding groove that cooperates with the movable part; the second bracket is provided with a second sliding groove that cooperates with the movable part; the guiding directions of the first sliding groove and the second sliding groove are perpendicular to each other and perpendicular to the optical axis; the bottom plate of the first bracket is in partial contact with the housing and forms a gap area.

[0013] In one embodiment of the present invention, the housing includes an outer shell and a base; the bottom opening of the outer shell is fixedly connected to the base to form a hollow cavity inside; and a light-transmitting hole is formed in the middle of the outer shell and the base.

[0014] In one embodiment of the present invention, the base plate of the first bracket is in partial contact with the support plate of the base through a first partial contact member to form an interval area; a reinforcing plate is provided on the base plate; and a clearance groove is provided on the reinforcing plate relative to the first sliding groove.

[0015] In one embodiment of the present invention, the top of the second bracket is provided with a cover plate; the edge of the cover plate extends to form an extension plate that cooperates with the first bracket; the extension plate is provided with a slot; the first bracket is provided with a locking block that cooperates with the slot.

[0016] In one embodiment of the present invention, the top of the second bracket is provided with a cover plate; the cover plate is snapped into the first bracket; the top of the cover plate is provided with a plurality of second partial contact members; the cover plate contacts the shell portion through the second partial contact members and forms a spaced area.

[0017] In one embodiment of the present invention, an automatic focusing drive unit for driving the first support to move is provided between the first support and the housing; the automatic focusing drive unit includes a first magnet disposed on the side of the first support and a first coil disposed on the inner side of the housing opposite to the first magnet.

[0018] The second support is provided with a disturbance compensation drive unit between the second support and the housing to drive the movement of the second support; the disturbance compensation drive unit includes a second magnet disposed on the second support and a second coil disposed on the housing opposite to the second magnet; the first support is provided with a clearance groove; the clearance groove is disposed opposite to the second magnet.

[0019] In one embodiment of this utility model, both the first magnet and the second magnet are made of Heilbeck magnetic array; the housing is provided with Hall sensors for sensing the positions of the first magnet and the second magnet respectively.

[0020] In one embodiment of this utility model, the second magnet includes a central magnet located at the center and outer magnets symmetrically arranged on both sides; the magnetization directions of the symmetrically arranged outer magnets are facing each other or facing away from each other; the angle between the magnetization direction of the central magnet and the magnetization direction of the outer magnets is α; and 25°≤α≤90°.

[0021] In one embodiment of this utility model, the first bracket moves along the optical axis in the hollow cavity via an autofocus guide; the housing is provided with a first limiting groove that cooperates with the autofocus guide; and the outer side of the first bracket is provided with a second limiting groove that cooperates with the autofocus guide.

[0022] In one embodiment of the present invention, the automatic focusing guide includes at least two large balls and a small ball disposed between adjacent large balls; the contact portion formed between the large balls and the first limiting groove has a tendency to move in the same direction.

[0023] In one embodiment of this utility model, the first bracket is provided with a first magnetic sheet that cooperates with the first magnet; the outer side of the housing is provided with a second magnetic sheet that is disposed opposite to the first magnet; the first magnet and the second magnetic sheet cooperate to use magnetic force to make the first bracket abut against the automatic focusing guide.

[0024] The beneficial effects of this utility model are as follows: The nested design of the first and second brackets decouples the AF (optical axis) and OIS (vertical optical axis) movements, compresses the height in the optical axis direction, and meets the requirements for thinner and lighter mobile devices. The reinforcing plate and the clearance groove reduce the amount of material used while improving the structural strength, supporting the driving of large-size lenses without increasing weight; the Helbeck magnetic array (or Helbeck magnetic array) increases the magnetic flux density per unit volume through unidirectional magnetic field enhancement technology, increasing the driving force by more than 50%; the magnetic sheet optimizes the magnetic circuit, reduces energy loss, and, together with the micron-level displacement feedback of the Hall sensor, achieves fast focusing and accurate image stabilization; the autofocus guide (combination of large and small ball bearings) and the double limiting groove ensure the accuracy of the optical axis movement, reduce shaking, and improve the smoothness of rolling; the partial contact parts and the interval area reduce air resistance, improving the image stabilization response speed; the magnetic abutment mechanism (magnetic sheet + magnet) provides flexible cushioning, combined with the physical stop of the limiting groove, enhances the drop resistance. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an exploded view of the structure of this utility model;

[0027] Figure 2 This is an exploded view of the first support structure of this utility model;

[0028] Figure 3 This is an exploded view of the second support structure of this utility model;

[0029] Figure 4 This is a perspective view of the second support of this utility model;

[0030] Figure 5 This is a schematic diagram of the first bracket and cover plate assembly of this utility model;

[0031] Figure 6 This is a schematic diagram of the automatic focusing guide component of this utility model;

[0032] Figure 7 This is a schematic diagram of the magnetization direction of the first magnet of this utility model;

[0033] Figure 8 This is a schematic diagram of the magnetization direction of the second magnet in this utility model;

[0034] Figure 9 This is a schematic diagram of the magnetization direction in another embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Housing; 101. Light-transmitting hole; 102. Support plate; 103. Hall sensor; 110. Base; 111. First limiting groove; 120. Outer shell; 130. Cover plate; 131. Extension plate; 132. Slot; 140. Second partial contact; 150. FPC board; 200. First bracket; 201. Base plate; 202. First partial contact; 203. Second limiting groove; 210. Autofocus drive unit; 211. First magnet; 212. First coil; 213. First magnetic conductive sheet; 2 14. Second magnetic guide sheet; 220. Automatic focusing guide; 221. Large ball bearing; 222. Small ball bearing; 230. First slide groove; 240. Clearance groove; 250. Locking block; 260. Groove; 270. Reinforcing plate; 271. Alternating groove; 300. Second bracket; 310. Disturbance compensation drive unit; 311. Second magnet; 3111. Middle magnet; 3112. Outer magnet; 312. Second coil; 320. Third magnetic guide sheet; 321. Limiting protrusion; 330. Second slide groove; 400. Movable part. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0038] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Example:

[0041] like Figure 1 As shown, the optical axis direction (Z-axis direction) refers to the vertical direction of the lens module, the first direction (X-axis direction) refers to the direction perpendicular to the optical axis direction (Z-axis direction), and the second direction (Y-axis direction) refers to the direction perpendicular to both the optical axis direction (Z-axis direction) and the first direction (X-axis direction). These definitions are for illustrative purposes only and do not limit the scope of the claims. The directions described above and shown in the figures are examples and may, of course, differ based on implementation and use.

[0042] like Figure 1 As shown, a low-profile, high-thrust OIS motor structure includes a housing 100, a first bracket 200, and a second bracket 300. The first bracket 200 and the second bracket 300 are housed within the housing 100. The second bracket 300 is housed within the first bracket 200. The first bracket 200 is configured to move along the optical axis (Z-direction), and the second bracket 300 is configured to move perpendicular to the optical axis, i.e., along a first direction (X-direction) and / or a second direction (Y-direction). A movable part 400 is provided between the first bracket 200 and the second bracket 300. The movable part 400 is configured to allow the first bracket 200 to move perpendicular to the optical axis. This design enables precise control of the movement of the second bracket 300 in different directions. The movement of the first bracket 200 along the optical axis can adjust parameters such as the lens focal length, while the movement of the second bracket 300 perpendicular to the optical axis under the action of the movable part 400 provides the basis for image stabilization. The two work together to enable the motor to meet various shooting needs and improve shooting results.

[0043] In one embodiment, the movable part 400 is a ball bearing;

[0044] In one embodiment, four movable parts 400 are provided, located at the four corners of the bottom of the first support 200 respectively;

[0045] The first bracket 200 is provided with a first slide groove 230 that cooperates with the movable part 400; the second bracket 300 is provided with a second slide groove 330 that cooperates with the movable part 400; the guiding directions of the first slide groove 230 and the second slide groove 330 are perpendicular to each other and perpendicular to the optical axis direction;

[0046] It is understandable that the guiding direction of the first slide 230 is the first direction, and the guiding direction of the second slide 330 is the second direction; or the guiding direction of the first slide 230 is the second direction, and the guiding direction of the second slide 330 is the first direction. The first slide 230 and the second slide 330 are independently configured, allowing the movement of the second support 300 in the first and second directions to be completed independently, avoiding motion interference and preventing deviations or instabilities in the movement of the second support 300 in the first / second directions. This avoids unintended movements caused by crosstalk problems (i.e., rotation around the optical axis). It ensures linear displacement of the second support 300 in the first / second directions, improving the stability and controllability of movement and enhancing the reliability of image stabilization. Precise linear displacement allows the lens to maintain stable position adjustment during image stabilization, thereby improving the stability and sharpness of the captured image. It avoids unnecessary shaking or deviation, solving various problems caused by unstable guidance in existing technologies.

[0047] The first slide groove 230 and the second slide groove 330 partially include the movable part 400, that is, the movable part 400 partially extends into the first slide groove 230 and the second slide groove 330, which can effectively reduce the height of the motor. The single-layer ball structure also ensures the linear movement of the second support 300 in the direction perpendicular to the optical axis.

[0048] like Figure 2 As shown, in one embodiment, the first groove 230 is a V-groove;

[0049] like Figure 3 , Figure 4 As shown, in one embodiment, the second groove 330 is a V-groove;

[0050] The base plate 201 of the first bracket 200 partially contacts the housing 100 and forms a gap area, which can ensure the response speed of the first bracket 200 in the optical axis direction; the partial contact between the base plate 201 of the first bracket 200 and the housing 100 can effectively reduce the contact area, and the gap area ensures the gap between the base plate 201 and the housing 100, which can effectively avoid air resistance when the base plate 201 and the housing 100 separate quickly;

[0051] like Figure 5As shown, in one embodiment, the base plate 201 of the first support 200 partially contacts the support plate 102 of the base 110 through a first partial contact member 202, forming a gap area. When the first support 200 focuses rapidly along the optical axis, in some initial states, the base plate 201 and the support plate 102 may be in contact. Both the base plate 201 and the support plate 102 are flat plate structures. During focusing, the base plate 201 and the support plate 102 will quickly separate, and the air between the plates needs to be quickly filled to fill the space created by the separation of the plates. However, the airflow... Due to the limited speed of the focusing plate, when focusing rapidly, air cannot quickly and evenly fill the space, thus creating a local low-pressure area between the plates (base plate 201 and support plate 102), while the outside of the plates is at normal atmospheric pressure. This creates a pressure difference, forming a force that hinders the separation of the plates, which manifests as significant resistance on a macroscopic scale. The faster the focusing speed, the more obvious this resistance becomes. However, the first local contact element 202 ensures that a gap is formed between the base plate 201 and the support plate 102, and air is always filled in it, avoiding the air resistance effect during rapid focusing.

[0052] In one embodiment, the first partial contact 202 has an arc-shaped protrusion on the side near the support plate 102; in another embodiment, one of the first partial contact 202 is provided at each of the four corners of the base plate 201; in yet another embodiment, the first partial contact 202 is made of a flexible material, and can also act as a limiting member to abut against the support plate 102, reducing vibration when in contact with the support plate 102 and preventing the first bracket 200 from impacting at extreme positions; the first partial contact 202 can also reduce vibration transmission and improve imaging stability; the height of the partial contact can be designed to be extremely small (e.g., 0.1 mm), avoiding increasing the overall thickness of the motor while ensuring functionality, thus meeting the requirements for thinner and lighter mobile devices.

[0053] In one embodiment, the housing 100 includes an outer shell 120 and a base 110. The bottom opening of the outer shell 120 is fixedly connected to the base 110 to form a hollow cavity inside. The nesting and fixing of the outer shell 120 and the base 110 forms a regular hollow cavity, providing compact installation space for internal supports (such as the first support 200 and the second support 300) and drive components (magnets, coils), reducing redundant volume in the optical axis direction. A light-transmitting hole 101 is formed in the middle of the outer shell 120 and the base 110. The fixed connection between the outer shell 120 and the base 110 forms a stable hollow cavity structure, providing reliable support and protection for internal components such as the first support 200 and the second support 300. During motor use, it can effectively resist external collisions and compression, ensuring the normal operation of internal precision components and extending the motor's service life.

[0054] like Figure 2As shown, in one embodiment, a reinforcing plate 270 is provided on the base plate 201; a clearance groove 271 is provided on the reinforcing plate 270 relative to the first sliding groove 230; the reinforcing plate 270 can effectively improve the mechanical strength of the base plate 201, avoid deformation of the base plate 201 caused by increased lens weight or high-frequency drive, thereby ensuring the stability of the first support 200 when moving in the optical axis direction, and improving focusing and image stabilization accuracy; by strengthening the rigidity of the base plate 201 through the reinforcing plate 270, the energy loss caused by structural deformation during the drive process can be reduced, and the motor driving force can be transmitted to the lens more efficiently, indirectly alleviating the problem of insufficient driving force. In one embodiment, the reinforcing plate 270 is embedded inside the base plate 201, effectively reducing the thickness; in one embodiment, the first sliding groove 230 is a V-shaped groove, which can ensure reliable contact with the movable part 400. The V-shaped groove also requires a certain thickness for setting. The design of the clearance groove 271 provides clearance space for the setting of the first sliding groove 230, ensuring the setting of the V-shaped groove while avoiding the increase of thickness. The reinforcing plate 270 strengthens the structure in key areas, while the recessed groove 271 reduces material redundancy through partial hollowing, thus reducing the overall weight while ensuring strength, which meets the requirements of thinner and lighter mobile devices.

[0055] In one embodiment, the top of the second bracket 300 is provided with a cover plate 130; the edge of the cover plate 130 extends to form an extension plate 131 that cooperates with the first bracket 200; the extension plate 131 is provided with a slot 132; the first bracket 200 is provided with a locking block 250 that cooperates with the slot 132. The engagement of the slot 132 and the locking block 250 limits the maximum displacement range of the second bracket 300 in the optical axis direction, preventing structural damage or functional failure due to excessive movement. The physical connection between the extension plate 131 and the locking block 250 suppresses vibration of the second bracket 300 in an unexpected direction (optical axis direction). The engagement of the cover plate 130 with the first bracket 200 effectively limits the position of the second bracket 300, facilitating effective contact between the movable part 400 and the first bracket 200 and the second bracket 300, ensuring that the mobility of the second bracket 300 does not fail. In one embodiment, the first bracket 200 is provided with a groove 260; the locking block 250 is disposed in the groove 260; the groove 260 engages with the extension plate 131 to accommodate the extension plate 131.

[0056] In one embodiment, the top of the second bracket 300 is provided with a cover plate 130; the cover plate 130 is snapped into the first bracket 200; the top of the cover plate 130 is provided with a plurality of second partial contact members 140; the cover plate 130 partially contacts the housing 100 through the second partial contact members 140 and forms a spaced area; the structure, function and role of the second partial contact members 140 are the same as those of the first partial contact members 202; the height of the partial contact members can be designed to be a very small value (e.g., 0.1 mm) to avoid increasing the overall thickness of the motor while ensuring functionality, thus meeting the requirements for thin and light mobile devices.

[0057] In one embodiment, an autofocus drive unit 210 for driving the first support 200 to move is provided between the first support 200 and the housing 100. The autofocus drive unit 210 includes a first magnet 211 disposed on the side of the first support 200 and a first coil 212 disposed on the inner side of the housing 100 opposite to the first magnet 211. Through electromagnetic interaction, the first support 200 can be precisely driven to move along the optical axis. This precise drive control allows the lens to quickly and accurately adjust the focal length, achieving autofocus.

[0058] A disturbance compensation drive unit 310 is provided between the second support 300 and the housing 100 to drive the movement of the second support 300; the disturbance compensation drive unit 310 includes a second magnet 311 disposed on the second support 300 and a second coil 312 disposed on the housing 100 opposite to the second magnet 311; a clearance groove 240 is provided on the first support 200; the clearance groove 240 is disposed opposite to the second magnet 311; in one embodiment, two sets of second magnets 311 and second coils 312 are provided to control the movement of the second support 300 in a first direction and a second direction, respectively; through the action of electromagnetic force, the second support 300 can be driven to move perpendicular to the optical axis, thereby effectively counteracting the shaking caused by hand tremors or other external factors.

[0059] Employing a magnet-coil electromagnetic drive method, the system utilizes electromagnetic interaction to generate driving force, achieving rapid response and precise displacement control. This meets the high-speed focusing requirements of autofocus (AF) and the high-frequency image stabilization requirements of optical image stabilization (OIS). The recess 240 brings the second magnet 311 and the second coil 312 closer together, reducing magnetic circuit losses, improving energy conversion efficiency, and lowering drive power consumption. The recess 240 provides dedicated space for the second magnet 311, ensuring that when the first support 200 (autofocus) moves along the optical axis (Z-axis), the movement of the second magnet 311 (perturbation compensation) in the direction perpendicular to the optical axis (XY plane) is unimpeded, ensuring independent operation for both.

[0060] like Figure 3As shown, in one embodiment, a third magnetic sheet 320 that cooperates with the second magnet 311 is embedded in the second support 300; the third magnetic sheet 320 is provided with a limiting protrusion 321 that cooperates with the second magnet 311.

[0061] In one embodiment, both the first magnet 211 and the second magnet 311 employ a Hellbeck magnetic array. By using alternating magnetic poles, the magnetic field is concentrated on one side (e.g., in the direction of the drive coil), increasing the magnetic flux density per unit volume and enhancing the electromagnetic driving force. The magnetic field on the other side is significantly weakened, avoiding electromagnetic interference to surrounding electronic components (e.g., sensors, circuit boards). This efficient magnetic circuit structure can adapt to ultra-thin spaces, meeting the miniaturization requirements of camera modules. The housing 100 is equipped with Hall sensors 103 that respectively sense the positions of the first magnet 211 and the second magnet 311. By detecting changes in the magnetic field gradient of the Hellbeck array magnets, the real-time positions of the first / second magnets (e.g., focus stroke, image stabilization offset) are accurately obtained.

[0062] like Figure 7 The diagram shows the magnetization direction of the first magnet 211. The first magnet 211 consists of three magnets stacked along the optical axis, and the magnetization directions of the three magnets are as follows: Figure 7 As shown, since the magnetic flux density (BY) is more than 1.5 times that of the traditional magnetic circuit configuration, the thrust is greatly improved. The focus response speed and the large thrust enable faster focusing speed and larger lenses.

[0063] like Figure 8 The diagram shows the magnetization direction of the second magnet 311. Two sets of second magnets 311 are arranged, each set containing three magnets. The magnetization direction of the magnets is as follows: Figure 8 As shown, since the magnetic flux density (BY) is more than 1.5 times that of the traditional magnetic circuit configuration, the thrust is greatly improved and the anti-shake effect is better.

[0064] In one embodiment, the second magnet 311 includes a central magnet 3111 located at the center and outer magnets 3112 symmetrically arranged on both sides of the central magnet 3111; as Figure 9 As shown, in one embodiment, the magnetization directions of the symmetrically arranged outer magnets 3112 are facing each other or away from each other; the angle between the magnetization direction of the middle magnet 3111 and the magnetization direction of the outer magnets 3112 is α; the angle of 25°≤α≤90° can effectively increase the magnetic field strength of the middle magnet 3111 in one direction while weakening the magnetic field strength in the other direction; for example Figure 8 The angle between the magnetization direction of the central magnet 3111 and the magnetization direction of the outer magnet 3112 shown on the right is 90°. Figure 8 and Figure 9The image only shows the case where one outer magnet 3112 is provided on each side of the central magnet 3111. In some embodiments, multiple outer magnets 3112 may be provided on both sides of the central magnet 3111.

[0065] In one embodiment, the first bracket 200 moves along the optical axis within the hollow cavity via an autofocus guide 220. The housing 100 has a first limiting groove 111 that mates with the autofocus guide 220. The outer side of the first bracket 200 has a second limiting groove 203 that mates with the autofocus guide 220. The autofocus guide 220 is strictly aligned with the optical axis, forcing the first bracket 200 to move linearly along the optical axis, preventing lateral offset or tilting, ensuring accurate focusing of the lens assembly, and improving image clarity. This eliminates the mechanical lag or wobbling that may occur with traditional flexible connections (such as springs), making it suitable for high-speed autofocus scenarios (such as video recording). The first limiting groove 111 defines the maximum travel distance (e.g., focusing distance range) of the first bracket 200, preventing collisions between the bracket and the housing 100 or detachment from the guide structure due to drive failure. The second limiting groove 203, in conjunction with the autofocus guide 220, forms a bidirectional limiting mechanism, further constraining the displacement boundary of the first bracket 200, particularly suitable for space-constrained scenarios in ultra-thin modules. Under the action of sudden external force (such as a fall), the limiting groove can reduce the displacement of the first support by 200 through physical stop, thus protecting the internal precision components (such as magnets and coils).

[0066] In one embodiment, the autofocus guide 220 includes at least two large ball bearings 221 and small ball bearings 222 disposed between adjacent large ball bearings 221; the contact portions formed between the large ball bearings 221 and the first limiting groove 111 tend to move in the same direction; the use of ball bearings transforms traditional sliding friction into rolling friction. The coefficient of rolling friction is much smaller than the coefficient of sliding friction, which greatly reduces the resistance experienced by the first support 200 when moving in the optical axis direction.

[0067] The combination of large and small balls 222 has multiple advantages. The large balls 221 provide the main support and guidance, ensuring stable movement of the bracket even under heavy loads; while the small balls 222 fill the gaps between the large balls 221. On the one hand, this further increases the spacing between the large balls 221, improving the straightness and stability of the guide. On the other hand, when the large balls 221 are moving, the small balls 222 can play an auxiliary rolling and buffering role, reducing direct friction between the large balls 221 and improving the smoothness and stability of the entire guide system.

[0068] Furthermore, the small ball 222 is key to achieving the same-direction movement of the large ball 221, thus ensuring smooth rolling. Traditional structures usually use a multi-ball structure with balls of the same size. When the support moves in one direction, adjacent balls will interact when they get close, causing the rolling direction to be opposite, which will result in poor rolling. Some balls cannot cooperate with the support through rolling friction, resulting in poor rolling and even vibration, affecting the anti-shake effect.

[0069] like Figure 6 As shown, the structure is illustrated with a small ball 222 positioned between two large balls 221. The small ball 222 is clamped in the middle of the two large balls 221, and its size is smaller. Figure 6 The dashed line indicates the size difference between the large ball 221 and the small ball 222. Therefore, the small ball 222 can usually only abut against the first limiting groove 111 or the second limiting groove 203, or be clamped in the middle by the large ball 221. The two large balls 221 can rotate in the same direction. Even when the three balls are rolling close together, the small ball 222 conducts the rotation and promotes the rotation of the two large balls 221 in the same direction, effectively ensuring smooth movement and reducing vibration. When the first support 200 is driven by the first coil 212 to move in the positive Z-axis direction, the large ball 221... Figure 6 The rotation of the large ball bearing 221 is directly driven by the movement of the first support 200, while the small ball bearing 222 is a driven structure. It is mainly driven by the rotation of the large ball bearing 221. The rotation direction of the small ball bearing 222 is counterclockwise. Due to the small size of the small ball bearing 222, the pressure of the small ball bearing 222 when it abuts against the first limiting groove 111 or the second limiting groove 203 is very small. The friction is insufficient to affect the rotation of the small ball bearing 222. Therefore, in actual movement, the large ball bearing 221 and the small ball bearing 222 can effectively maintain the rolling state, thereby avoiding the occurrence of sliding friction when the first support 200 moves. The automatic focusing guide 220 maintains rolling friction when it moves, which can effectively avoid shaking during focusing and improve the focusing speed.

[0070] In one embodiment, the first support 200 is provided with a first magnetic sheet 213 that cooperates with the first magnet 211; the outer side of the housing 100 is provided with a second magnetic sheet 214 that is disposed opposite to the first magnet 211; the first magnet 211 and the second magnetic sheet 214 cooperate to use magnetic force to make the first support 200 abut against the autofocus guide 220; the attraction between the first magnet 211 and the second magnetic sheet 214 ensures that the first support 200 is always in close contact with the autofocus guide 220; the magnetic force-assisted abutment reduces the contact pressure between the guide and the limiting groove, avoiding increased friction or component wear caused by excessive compression. The optimized magnetic field distribution of the magnetic sheet is more uniform and stable, making the Hall sensor 103 more accurate in detecting the position of the first magnet 211; when the device is subjected to external impact, the magnetic force abutment allows the first support 200 to move "elastically" within a certain range, absorbing impact energy and avoiding structural damage caused by rigid collision.

[0071] In one embodiment, an FPC board 150 is provided on the outside of the base 110, and the second magnetic sheet 214 is disposed on the outer layer of the FPC board 150.

[0072] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A low-height, high-force OIS motor structure, characterized by, The application relates to a camera lens, which comprises the following parts: a shell (100) with a hollow cavity formed inside; a first support (200) arranged in the hollow cavity and movable along the optical axis; a second support (300) arranged in the first support (200) and movable perpendicularly to the optical axis; a movable part (400) arranged between the second support (300) and the first support (200) and configured to provide the movement of the second support (300) perpendicularly to the optical axis; the first support (200) is provided with a first sliding groove (230) matched with the movable part (400); the second support (300) is provided with a second sliding groove (330) matched with the movable part (400); the guiding directions of the first sliding groove (230) and the second sliding groove (330) are perpendicular to each other and perpendicular to the optical axis; the bottom plate (201) of the first support (200) is partially in contact with the shell (100) and forms a spacing area.

2. The low-height, high-force OIS motor structure of claim 1, wherein: The shell (100) comprises an outer shell (120) and a base (110); the bottom of the outer shell (120) is open and fixedly connected with the base (110) to form a hollow cavity inside; the middle part of the outer shell (120) and the base (110) is provided with a light passing hole (101); the bottom plate (201) of the first support (200) is partially in contact with the supporting plate (102) of the base (110) through a first local contact piece (202) and forms a spacing area; the bottom plate (201) is provided with a reinforcing plate (270); the reinforcing plate (270) is provided with a position avoiding groove (271) at the position opposite to the first sliding groove (230).

3. The low-height, high-force OIS motor structure of claim 1, wherein: The top of the second support (300) is provided with a cover plate (130); the edge of the cover plate (130) is extended to form an extension plate (131) matched with the first support (200); the extension plate (131) is provided with a clamping groove (132); the first support (200) is provided with a clamping block (250) matched with the clamping groove (132).

4. The low-height, high-force OIS motor structure of claim 1, wherein: The top of the second support (300) is provided with a cover plate (130); the cover plate (130) is clamped with the first support (200); the top of the cover plate (130) is provided with a plurality of second local contact pieces (140); the cover plate (130) is partially in contact with the shell (100) through the second local contact pieces (140) and forms a spacing area.

5. The low-height, high-force OIS motor structure of claim 1, wherein: The first support (200) and the shell (100) are provided with an autofocus driving part (210) for driving the movement of the first support (200); the autofocus driving part (210) comprises a first magnet (211) arranged on the side of the first support (200) and a first coil (212) arranged on the inner side of the shell (100) and opposite to the first magnet (211). The second support (300) is provided with a disturbance compensation driving part (310) for driving the second support (300) to move, the disturbance compensation driving part (310) comprises a second magnet (311) arranged on the second support (300) and a second coil (312) arranged on the shell (100) opposite to the second magnet (311); the first support (200) is provided with a displacement slot (240); the displacement slot (240) is arranged opposite to the second magnet (311).

6. A low-height, high-force OIS motor structure according to claim 5, wherein: The first magnet (211) and the second magnet (311) are both Halbach magnetic arrays; the shell (100) is provided with a Hall sensor (103) for sensing the positions of the first magnet (211) and the second magnet (311) respectively.

7. A low-height, high-force OIS motor structure according to claim 5, wherein: The second magnet (311) comprises a central magnet (3111) and two outer magnets (3112) symmetrically arranged on the two sides; the magnetization directions of the outer magnets (3112) are opposite or back-to-back; the included angle between the magnetization direction of the central magnet (3111) and the magnetization direction of the outer magnet (3112) is α; 25°≤α≤90°.

8. The low-height, high-force OIS motor structure of claim 1, wherein: The first support (200) moves along the optical axis direction in the hollow cavity through an autofocus guide (220); the shell (100) is provided with a first limiting slot (111) matched with the autofocus guide (220); the outer side of the first support (200) is provided with a second limiting slot (203) matched with the autofocus guide (220).

9. A low-height, high-force OIS motor structure according to claim 8, wherein: The autofocus guide (220) comprises at least two large balls (221) and small balls (222) arranged between adjacent large balls (221); the contact part formed by the large balls (221) and the first limiting slot (111) has a same direction movement tendency.

10. The low-height, high-force OIS motor structure of claim 8, wherein: The first support (200) is provided with a first magnetic guide sheet (213) matched with the first magnet (211); the outer side of the shell (100) is provided with a second magnetic guide sheet (214) arranged opposite to the first magnet (211); the first magnet (211) and the second magnetic guide sheet (214) cooperate to use magnetic force to make the first support (200) abut against the autofocus guide (220).

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