An optical lifting platform, a camera module and an electronic device

Abstract

The utility model discloses a kind of lifting optical platform, camera module and electronic equipment, it is related to image equipment technical field, wherein, lifting optical platform includes: pedestal, moving seat and drive assembly, drive assembly includes multiple drive blocks being spaced apart, at least one of pedestal, moving seat and drive block is formed with wedge inclined plane, multiple drive blocks are cooperated wedge inclined plane by moving horizontally along the same direction, so that moving seat is lifted along height direction relative to pedestal;Limiting portion is arranged at the side of moving seat, for limiting the movement of moving seat in horizontal direction relative to pedestal, the technical scheme of the utility model, multiple drive blocks being spaced apart move horizontally along the same direction, by the unique structure of wedge inclined plane, the stable lifting of moving seat in height direction is realized. By accurately controlling the moving distance of drive block, the lifting height of moving seat can be accurately regulated and controlled, and it can be ensured that moving seat only moves in vertical direction, without additional rotation inhibition.

Description

Technical Field

[0001] This utility model relates to the field of imaging equipment technology, specifically to a lifting optical platform, a camera module, and electronic equipment. Background Technology

[0002] Lifting actuators can be used in electronic devices (such as cameras) to drive the camera lens elements to translate along their optical axis to achieve focusing (autofocus, AF) or zooming.

[0003] Chinese patent document CN119790227A discloses an actuator assembly comprising: a support structure, a first movable part, and a second movable part. The support structure serves as the foundation of the assembly, fixing the entire system. The first movable part is driven by an actuator device to rotate around a main axis, and its rotation is converted into helical movement by a first support device. The second movable part is restricted by a rotation control device (anti-rotation), and its helical movement is converted into linear translation by a second support device. This solution achieves high-precision, long-stroke linear movement through the coordinated design of the two movable parts and the helical drive.

[0004] In the above scheme, a braking device (SMA line) is used to drive the first movable part, so that the first movable part rotates about the main axis relative to the support structure (and relative to the second movable part).

[0005] However, using the above scheme makes the control of rotation consistency quite complex. Utility Model Content

[0006] In view of this, the present invention provides a lifting optical platform, a camera module and an electronic device to solve the problem that the control methods for the consistency of rotation of actuator components in the prior art are relatively complex.

[0007] This utility model provides a lifting optical platform, including:

[0008] Base;

[0009] A movable seat is mounted on the base;

[0010] An optical device is connected to the movable base, and the optical device moves together with the movable base;

[0011] A drive assembly is disposed between the base and the movable seat. The drive assembly includes a plurality of drive blocks spaced apart. At least one of the base, the movable seat, and the drive blocks has a wedge-shaped inclined surface formed on it. The plurality of drive blocks move horizontally in the same direction to cooperate with the wedge-shaped inclined surface, causing the movable seat to rise and fall relative to the base in the height direction.

[0012] A limiting part is provided on the side of the movable seat to limit the horizontal movement of the movable seat relative to the base.

[0013] In the technical solution of this utility model, the driving assembly consists of multiple spaced-apart driving blocks. These driving blocks move horizontally in the same direction, and with the help of the unique structure of the wedge-shaped inclined surface, the moving seat can be smoothly raised and lowered in the height direction. By precisely controlling the moving distance of the driving blocks, the lifting height of the moving seat can be accurately adjusted, and it can be ensured that the moving seat moves only in the vertical direction without the need for additional rotation suppression.

[0014] Specifically, the limiting part is located on the side of the movable base, effectively restricting the horizontal displacement of the movable base relative to the base. When the drive assembly operates, causing the movable base to rise and fall, the limiting part can prevent the movable base from shifting horizontally due to lateral forces or other external interference. The presence of the limiting part enhances the structural stability of the entire lifting optical platform. It cooperates and works in concert with the drive assembly, making the vertical movement of the movable base more stable and reliable.

[0015] Optionally, the drive block has a first protrusion that slides against the base, and the drive block also has a second protrusion that slides against the movable seat;

[0016] The movable seat has a first wedge-shaped inclined surface, and the movable seat slides with the first protrusion through the first wedge-shaped inclined surface;

[0017] The base has a flat surface or a second wedge-shaped inclined surface, and the base slides with the second protrusion through the flat surface or the second wedge-shaped inclined surface.

[0018] In the above scheme, the sliding fit between the drive block and the moving seat and base reduces the friction between the components to a certain extent through the contact between the protrusion and the inclined surface or plane, making the force transmission smoother and reducing the jamming caused by friction.

[0019] Optionally, the first protrusion and the second protrusion are balls or cylinders mounted on the drive block. This configuration, after the balls or cylinders are mounted on the drive block, utilizes the arc-shaped surface of the balls or cylinders to contact the base and the movable seat, thereby further reducing the friction between the components. Furthermore, the balls or cylinders are mounted to the drive block using an assembly method; the material of the balls or cylinders can be metal, which improves the smoothness and wear resistance of the arc-shaped surfaces of the balls or cylinders, ensuring lower friction while increasing service life.

[0020] Optionally, the drive block has a first limiting groove, and the first limiting groove has at least two balls or rollers. One end of the two balls or rollers rolls against each other, and the other end rolls against the wedge-shaped inclined surfaces of the base and the movable seat, respectively.

[0021] In the above scheme, the use of balls or rollers transforms the friction between the drive block and the base / moving seat into rolling friction, with a rolling friction coefficient much smaller than the sliding friction coefficient. During the horizontal movement of the drive block to raise and lower the moving seat, rolling friction significantly reduces energy loss, making the driving process smoother. Furthermore, the contact between the balls or rollers during rolling, as well as their contact with the wedge-shaped inclined surface, helps to create a certain degree of self-lubrication. This self-lubrication further reduces frictional resistance and wear.

[0022] Optionally, the movable seat has a third protrusion for sliding abutting against the drive block, and the base has a fourth protrusion for sliding abutting against the drive block;

[0023] A third wedge-shaped inclined surface is formed on the drive block, and the drive block slides with the third protrusion of the moving seat through the third wedge-shaped inclined surface;

[0024] The driving block has a plane or a fourth wedge-shaped inclined surface, and the driving block slides with the fourth protrusion of the base through the plane or the fourth wedge-shaped inclined surface.

[0025] In the above solution, a wedge-shaped inclined surface is formed on the driving block, and protrusions for engaging with the wedge-shaped inclined surface are formed on both the base and the movable seat. Thus, when the driving block moves, the movable seat can be driven to rise and fall relative to the base through the sliding engagement of the wedge-shaped inclined surface and the protrusions. This configuration, by having the protrusions slide against the wedge-shaped inclined surface, reduces the area of ​​the sliding friction surface, thereby reducing sliding resistance and increasing sliding smoothness.

[0026] Optionally, the movable seat has a first wedge-shaped inclined surface, the drive block has a third wedge-shaped inclined surface, the first wedge-shaped inclined surface and the third wedge-shaped inclined surface are parallel to each other, and at least one first rolling element is between the first wedge-shaped inclined surface and the third wedge-shaped inclined surface;

[0027] The base has a second wedge-shaped inclined surface, and the drive block has a fourth wedge-shaped inclined surface. The second wedge-shaped inclined surface and the fourth wedge-shaped inclined surface are parallel to each other, and at least one second rolling element is located between the second wedge-shaped inclined surface and the fourth wedge-shaped inclined surface.

[0028] In the above solution, wedge-shaped inclined surfaces are formed on the moving seat, the driving block, and the base, and rolling elements are arranged between two parallel and opposite inclined surfaces. When the driving block moves, the rolling elements cause the moving seat to rise and fall relative to the base. This arrangement, with its relative sliding engagement, further reduces the resistance when the driving block moves, improving the sensitivity of the drive.

[0029] Optionally, the first rolling element and the second rolling element are balls or rollers. The balls or rollers have regular shapes and smooth surfaces, and can provide precise guidance for the movement of the drive block when they roll between the drive block and the base and the moving seat.

[0030] Optionally, multiple drive blocks can be connected as a single unit via connecting plates. This configuration allows multiple drive blocks to move synchronously in the horizontal direction at the same speed and displacement during the lifting and lowering of the moving seat, enhancing drive stability.

[0031] Optionally, the limiting portion includes a first limiting surface located on a first side of the movable seat and a second limiting surface located on a second side of the movable seat, wherein the first limiting surface and the second limiting surface are at an angle. That is, the limiting portion is composed of a first limiting surface on the first side of the movable seat and a second limiting surface on the second side, and the two limiting surfaces are at an angle. This design can limit the movable seat from multiple directions. During the process of the drive assembly pushing the movable seat up and down, unnecessary swaying of the movable seat due to force can be prevented, making the lifting process smoother.

[0032] Optionally, the first limiting surface and / or the second limiting surface have at least two spaced apart. This technical solution reduces the contact area between the limiting surface and the side of the moving seat compared to a continuous, large-area limiting surface. This arrangement reduces the friction between the limiting surface and the side of the moving seat. During the lifting and lowering process of the moving seat, lower friction means less energy loss, requiring less power from the drive components to push the moving seat, thereby improving the smoothness of the lifting and lowering process.

[0033] Optionally, the first side of the movable seat has a fifth protrusion protruding toward the first limiting surface, and the second side of the movable seat has a sixth protrusion protruding toward the second limiting surface. At least one of the fifth and sixth protrusions has at least two protrusions spaced apart. This arrangement, through the contact between the protrusions and the limiting surface, further reduces sliding friction resistance during lifting and lowering. Specifically, as the movable seat moves, the contact point between the protrusions and the limiting surface continuously changes. This dynamic contact method is similar to rolling friction, and the coefficient of rolling friction is less than the coefficient of sliding friction. Even though the protrusions are not true rolling elements, this rolling-like tendency helps to further reduce friction resistance.

[0034] Optionally, the fifth and sixth protrusions are ball bearings, and the side of the movable seat has a second limiting groove for accommodating the ball bearings. When the fifth and sixth protrusions are ball bearings and are accommodated in the second limiting groove on the side of the movable seat, rolling friction is generated between the ball bearings and the limiting surface during the lifting and lowering of the movable seat. When the drive assembly pushes the movable seat up or down, the rolling of the ball bearings greatly reduces the resistance between the movable seat and the limiting surface, significantly reducing the energy required for drive, which not only reduces the load on the drive assembly but also improves the smoothness of drive.

[0035] Optionally, the first limiting surface has a first guide groove extending along the height direction, and the first side of the movable seat has a second guide groove opposite to the first guide groove, with balls inside the first guide groove and the second guide groove; the second limiting surface is a plane that is in contact with the second side of the movable seat.

[0036] Using the above technical solution, ball bearings are installed in the first guide groove extending along the height direction on the first limiting surface and in the second guide groove opposite to the first side of the movable seat, forming a high-precision guiding structure. The ball bearings roll between the two guide grooves, which can accurately guide the movable seat to rise and fall smoothly along the height direction.

[0037] Optionally, the first guide groove and the second guide groove are V-grooves. With this configuration, the ball bearings are positioned within the V-grooves, making close contact with the side walls of the V-grooves to form a stable two-point contact structure. This structure restricts the ball bearings' freedom in the horizontal direction, allowing them to roll only along the extension direction of the V-grooves, thereby precisely guiding the moving seat to rise and fall in the height direction. Furthermore, the V-groove structure has a significant advantage in resisting lateral forces. When the moving seat is subjected to lateral forces, the side walls of the V-groove can convert these forces into pressure on the ball bearings, causing them to fit more tightly within the groove and preventing lateral displacement.

[0038] Optionally, the first limiting surface is an arc-shaped surface extending along the height direction, and the first side of the movable seat has a third guide groove extending along the height direction, the arc-shaped surface being accommodated in the third guide groove; the second limiting surface is an arc-shaped surface that is in close contact with the second side of the movable seat.

[0039] Using the above technical solution, the first limiting surface is an arc-shaped surface extending along the height direction, and it cooperates with the third guide groove extending along the height direction on the first side of the movable seat. The arc-shaped surface is accommodated within the third guide groove, restricting the horizontal displacement of the movable seat and ensuring that it can only move smoothly up and down along the height direction. The second limiting surface is also an arc-shaped surface that fits tightly against the second side of the movable seat. The two arc-shaped surfaces limit the movable seat from both sides. This double-sided arc-shaped surface limiting structure can effectively restrict the horizontal displacement of the movable seat, while the contact area between the arc-shaped surface and the side of the movable seat is relatively small, making the sliding smoother.

[0040] Optionally, the third guide groove is a V-shaped groove. This configuration creates a stable structure with two-point contact between the two side walls of the V-shaped groove and the arc-shaped surface, greatly restricting the degree of freedom in that direction. This ensures that the moving seat can only move smoothly along the height direction determined by the V-shaped groove during lifting and lowering.

[0041] Optionally, it further includes a biasing element connected to the movable seat, the biasing element having a biasing force that causes the movable seat to move closer towards the base. Specifically, the biasing element may include a leaf spring, a magnetic element, etc.

[0042] In the above solution, the biasing component provides a biasing force that brings the moving seat closer to the base, ensuring a tight fit between the moving seat and the base at all times. This configuration compensates for gaps or errors during the machining and assembly process. Furthermore, this biasing force also ensures the smooth descent of the moving seat when it is driven to descend.

[0043] Optionally, it further includes: a shape memory alloy, which is connected to the driving block, and at least one end of the shape memory alloy is connected to a power device, which drives the shape memory alloy to move, thereby driving the driving block to move. Specifically, the power device may include a linear motor, a piezoelectric motor, or a stepper motor.

[0044] In the above scheme, the shape memory alloy is connected to the drive block, and its movement is driven by a power device, which in turn moves the drive block. Taking a linear motor as the power device as an example, a linear motor can provide high-precision linear displacement output, with displacement accuracy reaching the micrometer or even nanometer level. Due to the characteristics of the shape memory alloy, it can accurately transmit the displacement of the power device to the drive block, thereby improving the movement accuracy of the drive block. In a lifting optical platform, this means that the lifting accuracy of the moving seat can be greatly improved.

[0045] Different power units, such as piezoelectric motors and stepper motors, can provide diverse driving methods for shape memory alloys. Piezoelectric motors have a fast response speed, enabling rapid and precise micro-displacement control; stepper motors can precisely control the rotation angle by controlling the number of pulses, thus translating it into linear displacement of the drive block. This flexibility allows the lifting optical platform to adapt to different working scenarios and task requirements.

[0046] This utility model also provides a camera module, including: a housing and a lifting optical platform as described in any of the above solutions.

[0047] This utility model solution, by employing any of the above-mentioned lifting optical platforms, possesses all the advantages of the lifting optical platform.

[0048] This utility model also provides an electronic device, including: the camera module described in the above solution. Attached Figure Description

[0049] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0050] Figure 1 A perspective view of a lifting optical platform provided for an embodiment of this utility model;

[0051] Figure 2 for Figure 1 A schematic diagram of the structure behind the concealed movable base and optical components;

[0052] Figure 3 A perspective view of a first specific embodiment of a driver block in a driver component;

[0053] Figure 4 A perspective view of a second specific embodiment of the driver block;

[0054] Figure 5 A perspective view of a third specific embodiment of the driver block;

[0055] Figure 6 A perspective view of the fourth specific embodiment of the driver block;

[0056] Figure 7 A perspective view of the fifth specific implementation of the driver block;

[0057] Figure 8 A perspective view of the sixth specific implementation of the driving block;

[0058] Figure 9 A perspective view of the seventh specific implementation of the driver block;

[0059] Figure 10 A perspective view of the eighth specific implementation of the driver block;

[0060] Figure 11 A perspective view of the ninth specific implementation of the driver block;

[0061] Figure 12 A perspective view of the tenth specific implementation of the driving block;

[0062] Figure 13 A perspective view of the second type of lifting optical platform provided in an embodiment of this utility model;

[0063] Figure 14 for Figure 1 A second-angle perspective view of the movable base and optical components of the lifting optical platform in the image;

[0064] Figure 15 A perspective view of the third type of lifting optical platform provided in the embodiments of this utility model;

[0065] Figure 16 for Figure 15 Enlarged view of region A in the middle;

[0066] Figure 17 A perspective view of the fourth type of lifting optical platform provided in the embodiments of this utility model;

[0067] Figure 18 A top view of the first arrangement of the moving components on the base in the lifting optical platform provided in this embodiment of the utility model;

[0068] Figure 19 for Figure 18 A 3D view of the driving components;

[0069] Figure 20 A top view of a second arrangement of the moving components on the base in the lifting optical platform provided in an embodiment of the present invention;

[0070] Figure 21 for Figure 20 A 3D view of the driving components;

[0071] Figure 22 A perspective view of a camera module provided for an embodiment of this utility model.

[0072] Explanation of reference numerals in the attached figures:

[0073] 1. Base; 2. Movable base; 3. Optical components; 4. Drive assembly; 5. Drive block; 6. First wedge-shaped inclined surface; 7. Limiting part; 8. First protrusion; 9. First limiting groove; 10. First rolling element; 11. Second rolling element; 12. Connecting plate; 13. First limiting surface; 14. Second limiting surface; 15. Fifth protrusion; 16. Second limiting groove; 17. Housing; 18. Second protrusion; 19. Second wedge-shaped inclined surface; 20. Third protrusion; 21. Fourth protrusion; 22. Third wedge-shaped inclined surface; 23. Fourth wedge-shaped inclined surface; 24. Sixth protrusion; 25. First guide groove; 26. Second guide groove; 27. Third guide groove; 28. Shape memory alloy. Detailed Implementation

[0074] 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 some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0075] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0076] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0077] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0078] Regarding the patents described in the background section, potential reasons why the consistency of rotation is difficult to control include:

[0079] Firstly, there are differences in the driving of SMA components.

[0080] Specifically, the contraction characteristics of SMA elements are affected by temperature and energization time. If the driving parameters of multiple sets of elements (such as four SMA elements arranged in a ring) are inconsistent, it is easy to cause uneven rotational torque.

[0081] The solution in its patent is to arrange SMA elements in a cross pattern so that the driving directions of adjacent elements alternate, thereby offsetting the performance fluctuations of individual elements and improving torque uniformity.

[0082] Secondly, the machining error of the spiral support component.

[0083] Specifically, if there are machining tolerances in the helix angles (positive / negative angles) of the first and second support devices, it will lead to inconsistent rotation-translation conversion ratios, affecting the accuracy of the rotation amount.

[0084] The solution in its patent is to emphasize the design of the force application point, so that the connection point of the SMA element is close to the main axis, while the helical support is far away from the axis, and to reduce the influence of the support surface error on the rotation by using the "lever effect" (the normal force of the support surface is reduced, and the influence of friction fluctuation is reduced).

[0085] Third, the frictional resistance is uneven.

[0086] Specifically, uneven contact pressure on the anti-rotation device (such as the third support device) or friction surface (first / second friction surface) can cause fluctuations in rotational resistance and affect the consistency of rotation.

[0087] The solution in its patent is to apply pressure evenly by using a biasing device (such as a spring arm) to ensure stable static friction; or to use rolling support components (such as balls) instead of sliding support to reduce friction fluctuations.

[0088] Therefore, the control methods for the consistency of rotation using its patented technology are quite complex.

[0089] Furthermore, in the patent described in the background section, the rotation amount control scheme includes:

[0090] First, the active rotation control mechanism.

[0091] Additional actuator device: The second movable part is directly driven to rotate through another set of SMA elements, and the rotational deviation is compensated in real time to achieve closed-loop control.

[0092] Bistable device: It enables the first movable part to have two stable equilibrium positions (such as extended / retracted state) and reduces the rotational fluctuation in the intermediate position through mechanical limiting.

[0093] Second, structural design optimization.

[0094] Circular SMA layout: Four SMA elements are arranged in a ring at different angles, with adjacent elements driving in opposite directions (such as alternating clockwise / counterclockwise) to ensure symmetrical rotational torque and offset the driving error of a single element.

[0095] Nested mechanical limiting: In the retracted state, the first / second movable part is nested within the support structure, and the rotation range is constrained by the physical limiting surface, improving the repeatability accuracy.

[0096] Third, zero-power position retention.

[0097] By utilizing friction surfaces and biasing devices to generate static friction when power is off, the position of movable parts is locked, preventing rotational drift caused by external interference. For example, the contact between a spring arm and a supporting structure generates uniform friction, maintaining the rotational position.

[0098] Therefore, the method of controlling the amount of rotation using its patented technology is also quite complex.

[0099] Key control points in the implementation of the aforementioned patents include:

[0100] First, SMA component consistency.

[0101] By selecting the same batch of SMA materials and controlling the current synchronously through the circuit, the difference in component shrinkage can be reduced; or dual SMA components can be driven in opposite directions to compensate for performance fluctuations.

[0102] Second, the machining accuracy of the support components.

[0103] The angular tolerance of the screw support is controlled within ±0.5°, and the surface roughness Ra≤0.8μm to avoid rotation deviation due to mechanical fit clearance.

[0104] Third, frictional resistance calibration.

[0105] During assembly, the preload of the biasing device (such as a spring) is adjusted by a pressure sensor to ensure uniform contact pressure on the friction surfaces (deviation ≤5%). If necessary, a lubricating coating is added to reduce friction fluctuations.

[0106] Therefore, the implementation of its patented technology requires high-level process control.

[0107] In addition, if the ambient temperature fluctuates by more than 10°C when using the above-mentioned patent, the difference in thermal expansion of the SMA element may cause the rotation amount to drift, and an additional temperature compensation circuit is required.

[0108] The following is combined with Figures 1 to 22 The following describes embodiments of the present invention.

[0109] Example 1

[0110] like Figure 1 As shown, this embodiment of the lifting optical platform includes a base 1, a movable base 2, an optical component 3, and a drive assembly 4. The movable base 2 is mounted on the base 1, and the optical component 3 is connected to the movable base 2, moving together with the movable base 2. In other words, during operation, the drive assembly 4 drives the movable base 2 to move up and down relative to the base 1, causing the optical component 3 to move with the movable base 2, thereby achieving height adjustment of the optical component 3.

[0111] like Figure 1 , Figure 2 As shown, the drive assembly 4 is disposed between the base 1 and the movable seat 2. The drive assembly 4 includes a plurality of drive blocks 5 spaced apart. At least one of the base 1, the movable seat 2 and the drive block 5 has a wedge-shaped inclined surface formed on it. The plurality of drive blocks 5 move horizontally in the same direction to cooperate with the wedge-shaped inclined surface, so that the movable seat 2 moves up and down relative to the base 1 in the height direction.

[0112] like Figure 1 , Figure 2 As shown, a limiting part 7 is provided on the side of the movable seat 2 to limit the horizontal movement of the movable seat 2 relative to the base 1.

[0113] In the technical solution of this utility model, the drive assembly 4 consists of multiple drive blocks 5 arranged at intervals. These drive blocks 5 move horizontally in the same direction, and with the help of the unique structure of the wedge-shaped inclined surface, the moving seat 2 can be smoothly raised and lowered in the height direction. By precisely controlling the moving distance of the drive blocks 5, the lifting height of the moving seat 2 can be accurately adjusted, and it can be ensured that the moving seat 2 moves only in the vertical direction without the need for additional rotation suppression.

[0114] Specifically, the limiting part 7 is disposed on the side of the movable base 2, which effectively limits the horizontal displacement of the movable base 2 relative to the base 1. When the drive assembly 4 operates, driving the movable base 2 to rise and fall, the limiting part 7 can prevent the movable base 2 from shifting in the horizontal direction due to lateral forces or other external interference. The presence of the limiting part 7 enhances the structural stability of the entire lifting optical platform. It cooperates and works in concert with the drive assembly 4, making the lifting movement of the movable base 2 in the height direction more stable and reliable.

[0115] like Figure 2As shown, in this embodiment, the limiting part 7 includes a first limiting surface 13 located on the first side of the movable seat 2 and a second limiting surface 14 located on the second side of the movable seat 2. The first limiting surface 13 and the second limiting surface 14 are at an angle. That is, the limiting part 7 is composed of the first limiting surface 13 on the first side of the movable seat 2 and the second limiting surface 14 on the second side, and the two limiting surfaces are at an angle. This design can limit the movable seat 2 from multiple directions. During the process of the driving component 4 pushing the movable seat 2 to rise and fall, unnecessary swaying of the movable seat 2 due to force can be prevented, making the rising and falling process more stable.

[0116] like Figure 1 As shown, in some embodiments, the system further includes a biasing element connected to the movable seat 2, the biasing element having a biasing force that causes the movable seat 2 to move closer towards the base 1. Specifically, the biasing element may include a leaf spring, a magnetic element, etc. For example, when a magnetic element is used, the magnetic element can be placed on the movable seat 2, and then a magnetic conductor can be placed at a corresponding position on the base 1, thereby achieving a biasing force that causes the movable seat 2 to move closer towards the base 1 through the mutual attraction between the magnetic element and the magnetic conductor.

[0117] In the above scheme, the biasing component provides a biasing force that brings the movable seat 2 closer to the base 1, ensuring that the movable seat 2 and the base 1 always maintain a tight fit. This configuration can compensate for gaps or errors in the mechanical manufacturing and assembly process. In addition, when driving the movable seat 2 to descend, this biasing force also ensures the smooth descent of the movable seat 2.

[0118] like Figure 1 , Figure 2 As shown, in some embodiments, it further includes a shape memory alloy 28, which is connected to the driving block 5. At least one end of the shape memory alloy 28 is connected to a power device, which drives the shape memory alloy 28 to move, thereby moving the driving block 5. Specifically, the power device may include a linear motor, a piezoelectric motor, or a stepper motor.

[0119] In the above scheme, the shape memory alloy 28 can be an SMA metal wire. The middle section of the shape memory alloy 28 is connected to the drive block 5, one end can be fixed to the base 1, and the other end is connected to the drive device. The drive device drives the shape memory alloy 28 to move, thereby moving the drive block 5. Taking a linear motor as the drive device as an example, a linear motor can provide high-precision linear displacement output, and its displacement accuracy can reach the micron or even nanometer level. Due to the characteristics of the shape memory alloy 28, it can accurately transmit the displacement of the drive device to the drive block 5, so that the movement accuracy of the drive block 5 can also be improved accordingly. In the lifting optical platform, this means that the lifting accuracy of the moving seat 2 can be greatly improved.

[0120] Different power units, such as piezoelectric motors and stepper motors, can provide diverse driving methods for the shape memory alloy 28. Piezoelectric motors have a fast response speed, enabling rapid and precise micro-displacement control; stepper motors can precisely control the rotation angle by controlling the number of pulses, which is then converted into linear displacement of the drive block 5. This flexibility allows the lifting optical platform to adapt to different working scenarios and task requirements.

[0121] like Figure 3 As shown, in some embodiments, the movable seat 2, the driving block 5, and the base 1 are each provided with a wedge-shaped inclined surface. Specifically, the movable seat 2 has a first wedge-shaped inclined surface 6, the base 1 has a second wedge-shaped inclined surface 19, and the driving block 5 has a third wedge-shaped inclined surface 22 and a fourth wedge-shaped inclined surface 23. The third wedge-shaped inclined surface 22 is in sliding engagement with the first wedge-shaped inclined surface 6, and the fourth wedge-shaped inclined surface 23 is in sliding engagement with the second wedge-shaped inclined surface 19. In use, the driving block 5 moves to one side, and with the cooperation of the four wedge-shaped inclined surfaces, drives the movable seat 2 to move upward or downward relative to the base 1.

[0122] like Figure 4 , Figure 5 As shown, in some embodiments, the drive block 5 has a first protrusion 8 that slides against the base 1, and the drive block 5 also has a second protrusion 18 that slides against the movable seat 2.

[0123] The movable seat 2 has a first wedge-shaped inclined surface 6 formed thereon, and the movable seat 2 slides with the first protrusion 8 through the first wedge-shaped inclined surface 6.

[0124] The base 1 has a plane or a second wedge-shaped inclined surface 19 formed on it, and the base 1 slides with the second protrusion 18 through the plane or the second wedge-shaped inclined surface 19.

[0125] In the above scheme, the sliding engagement between the drive block 5, the moving seat 2, and the base 1 reduces the friction between the components to a certain extent through the contact between the protrusion and the inclined or flat surface, making the force transmission smoother and reducing the jamming caused by friction.

[0126] like Figure 6As shown, in some embodiments, the first protrusion 8 and the second protrusion 18 are balls or cylinders mounted on the drive block 5. This arrangement allows the balls or cylinders to contact the base 1 and the movable seat 2 via their curved surfaces after being mounted on the drive block 5, thereby further reducing friction between the components. Furthermore, the balls or cylinders are mounted to the drive block 5 using an assembly method; the material of the balls or cylinders can be metal, which improves the smoothness and wear resistance of the curved surfaces, ensuring less friction while increasing service life.

[0127] It should be noted that in this embodiment, the ball or cylinder is fixed to the drive block 5 by embedding. This means that the ball or cylinder cannot rotate relative to the drive block 5. This design enhances the stability of the ball or cylinder, thereby extending the overall service life of the drive block 5. This is because the contact area between the ball or cylinder and the drive block 5 is relatively large; if the ball or cylinder were rotatable, excessive frictional resistance would prevent it from rotating properly. Of course, the above description is not limiting; in some alternative embodiments, the ball or cylinder can also be rotatably connected to the drive block 5.

[0128] like Figure 7 As shown, in some embodiments, the drive block 5 has a first limiting groove 9, which is a through groove extending vertically. The first limiting groove 9 has at least two balls or rollers, one end of each ball or roller rolls against each other, and the other end rolls against the wedge-shaped inclined surfaces of the base 1 and the movable seat 2 respectively.

[0129] In the above scheme, the use of balls or rollers transforms the friction between the drive block 5 and the base 1 and the movable seat 2 into rolling friction, with the rolling friction coefficient being much smaller than the sliding friction coefficient. During the horizontal movement of the drive block 5 to drive the movable seat 2 up and down, rolling friction significantly reduces energy loss, making the driving process smoother. Furthermore, the contact between the balls or rollers during rolling, as well as their contact with the wedge-shaped inclined surface, helps to create a certain degree of self-lubrication. This self-lubrication further reduces frictional resistance and wear.

[0130] like Figure 8 , Figure 9 As shown, in some embodiments, the movable seat 2 has a third protrusion 20 for sliding contact with the drive block 5, and the base 1 has a fourth protrusion 21 for sliding contact with the drive block 5.

[0131] A third wedge-shaped inclined surface 22 is formed on the driving block 5, and the driving block 5 slides with the third protrusion 20 of the moving seat 2 through the third wedge-shaped inclined surface 22.

[0132] The driving block 5 has a plane or a fourth wedge-shaped inclined surface 23 formed on it, and the driving block 5 slides with the fourth protrusion 21 of the base 1 through the plane or the fourth wedge-shaped inclined surface 23.

[0133] In the above solution, a wedge-shaped inclined surface is formed on the driving block 5, and protrusions for engaging with the wedge-shaped inclined surface are formed on the base 1 and the movable seat 2, respectively. Thus, when the driving block 5 moves, the movable seat 2 can be driven to rise and fall relative to the base 1 through the sliding engagement of the wedge-shaped inclined surface and the protrusions. This configuration, through the sliding engagement of the protrusions and the wedge-shaped inclined surface, reduces the area of ​​the sliding friction surface, thereby reducing sliding resistance and increasing sliding smoothness.

[0134] like Figure 10 , Figure 11 , Figure 12 As shown, in some embodiments, the movable seat 2 has a first wedge-shaped inclined surface 6, and the drive block 5 has a third wedge-shaped inclined surface 22. The first wedge-shaped inclined surface 6 and the third wedge-shaped inclined surface 22 are parallel to each other, and at least one first rolling element 10 is between the first wedge-shaped inclined surface 6 and the third wedge-shaped inclined surface 22.

[0135] The base 1 has a second wedge-shaped inclined surface 19, and the drive block 5 has a fourth wedge-shaped inclined surface 23. The second wedge-shaped inclined surface 19 and the fourth wedge-shaped inclined surface 23 are parallel to each other, and at least one second rolling element 11 is between the second wedge-shaped inclined surface 19 and the fourth wedge-shaped inclined surface 23.

[0136] In the above scheme, the wedge-shaped inclined surfaces are formed on the movable seat 2, the driving block 5, and the base 1, and rolling elements are arranged between two parallel and opposite inclined surfaces. Thus, when the driving block 5 moves, the rolling elements cause the movable seat 2 to rise and fall relative to the base 1. This arrangement, with its relative sliding engagement, further reduces the resistance when the driving block 5 moves, improving the sensitivity of the drive.

[0137] It should be noted that in this embodiment, the first rolling element 10 and the second rolling element 11 are balls or rollers. That is, balls or rollers are rotatably disposed between two inclined surfaces. The balls or rollers have regular shapes and smooth surfaces, and can provide precise guidance for the movement of the drive block 5 when rolling between the drive block 5 and the base 1 and the moving seat 2. Of course, the above description is not limiting. In some alternative embodiments, the first rolling element 10 and the second rolling element 11 can also adopt other conventional structures, such as gears.

[0138] like Figure 13As shown, in some embodiments, the first limiting surface 13 and / or the second limiting surface 14 have at least two spaced-apart surfaces. This arrangement reduces the contact area between the limiting surfaces and the sides of the movable seat 2 compared to a continuous, large-area limiting surface.

[0139] Specifically, in this embodiment, the limiting part 7 has two spaced-apart parts on one side of the movable seat 2 and one on the other side of the movable seat 2. This arrangement reduces the friction between the limiting surface and the side of the movable seat 2. During the lifting and lowering process of the movable seat 2, the lower friction means less energy loss, and the driving component 4 requires less power to push the movable seat 2, thereby improving the smoothness of the lifting and lowering process.

[0140] Of course, the above description is not limiting. In some alternative embodiments, multiple limiting parts 7 may be provided on both adjacent sides of the movable seat 2.

[0141] like Figure 14 As shown, in this embodiment, the first side of the movable seat 2 has a fifth protrusion 15 protruding towards the first limiting surface 13, and the second side of the movable seat 2 has a sixth protrusion 24 protruding towards the second limiting surface 14. At least one of the fifth protrusion 15 and the sixth protrusion 24 has at least two protrusions spaced apart. This arrangement, by having the protrusions contact the limiting surface, further reduces the sliding friction resistance during the lifting and lowering process. Specifically, when the movable seat 2 moves, the contact point between the protrusions and the limiting surface continuously changes. This dynamic contact method is similar to rolling friction, and the coefficient of rolling friction is less than the coefficient of sliding friction. Even though the protrusions are not true rolling elements, this rolling-like tendency helps to further reduce friction resistance.

[0142] like Figure 14 As shown, in this embodiment, the fifth protrusion 15 and the sixth protrusion 24 are ball bearings, and the side of the movable seat 2 has a second limiting groove 16 for accommodating the ball bearings. When the fifth protrusion 15 and the sixth protrusion 24 are ball bearings and are accommodated in the second limiting groove 16 on the side of the movable seat 2, rolling friction is formed between the ball bearings and the limiting surface during the lifting and lowering process of the movable seat 2. When the drive assembly 4 pushes the movable seat 2 to rise or fall, the rolling of the ball bearings greatly reduces the resistance between the movable seat 2 and the limiting surface, significantly reducing the energy required for driving, which not only reduces the load on the drive assembly 4 but also improves the smoothness of driving.

[0143] Of course, the above description is not limiting. In some alternative embodiments, the fifth protrusion 15 and the sixth protrusion 24 can be configured as non-rolling structures. For example, the ball bearings can be embedded in the side of the movable seat 2.

[0144] like Figure 15 , Figure 16 As shown, in some embodiments, the first limiting surface 13 has a first guide groove 25 extending along the height direction, and the first side of the movable seat 2 has a second guide groove 26 opposite to the first guide groove 25. The first guide groove 25 and the second guide groove 26 contain ball bearings; the second limiting surface 14 is a plane that is in close contact with the second side of the movable seat 2.

[0145] Using the above technical solution, a ball bearing is installed in the first guide groove 25 extending along the height direction on the first limiting surface 13 and the second guide groove 26 opposite to the first side of the movable seat 2, forming a high-precision guiding structure. The ball bearing rolls between the two guide grooves, which can accurately guide the movable seat 2 to rise and fall smoothly along the height direction.

[0146] It should be noted that in this embodiment, the first guide groove 25 and the second guide groove 26 are V-grooves. This configuration ensures that the ball bearings are in close contact with the two side walls of the V-groove, forming a stable two-point contact structure. This structure restricts the ball bearings' freedom in the horizontal direction, allowing them to roll only along the extension direction of the V-groove, thereby precisely guiding the moving seat 2 to rise and fall in the height direction. Furthermore, the V-groove structure has a significant advantage in resisting lateral forces. When the moving seat 2 is subjected to a lateral force, the two side walls of the V-groove can convert the lateral force into pressure on the ball bearings, making the ball bearings fit more tightly within the groove and preventing lateral displacement.

[0147] Of course, the above description is not limiting. In some alternative embodiments, the cross-sections of the first guide groove 25 and the second guide groove 26 can also be other shapes, such as arc-shaped cross-sections, rectangular cross-sections, etc.

[0148] like Figure 17 As shown, in some embodiments, the first limiting surface 13 is an arc-shaped surface extending along the height direction, and the first side of the movable seat 2 has a third guide groove 27 extending along the height direction, and the arc-shaped surface is accommodated in the third guide groove 27; the second limiting surface 14 is an arc-shaped surface that is in close contact with the second side of the movable seat 2.

[0149] Using the above technical solution, the first limiting surface 13 is an arc-shaped surface extending along the height direction, and it cooperates with the third guide groove 27 extending along the height direction on the first side of the movable seat 2. The arc-shaped surface is accommodated within the third guide groove 27, restricting the displacement of the movable seat 2 in the horizontal direction, so that it can only rise and fall smoothly in the height direction. The second limiting surface 14 is also an arc-shaped surface that fits tightly against the second side of the movable seat 2. The two arc-shaped surfaces limit the movable seat 2 from both sides. This double-sided arc-shaped surface limiting structure can effectively restrict the displacement of the movable seat 2 in the horizontal direction. At the same time, the contact area between the arc-shaped surface and the side of the movable seat 2 is relatively small, making the sliding smoother.

[0150] It should be noted that in this embodiment, the third guide groove 27 is a V-shaped groove. This design creates a stable structure with two points of contact between the two side walls of the V-shaped groove and the arc-shaped surface, greatly restricting the degree of freedom in that direction. This ensures that the movable seat 2 can only move smoothly along the height direction determined by the V-shaped groove during lifting and lowering.

[0151] like Figures 18 to 21 As shown, in this embodiment, multiple drive blocks 5 are connected as a whole by a connecting plate 12. This arrangement allows multiple drive blocks 5 to move synchronously in the horizontal direction at the same speed and displacement during the lifting and lowering of the drive moving seat 2, enhancing the stability of the drive.

[0152] like Figure 18 , Figure 19 As shown, in some embodiments, the angle between the driving direction of the plurality of driving blocks 5 and the extension direction of the shape memory alloy 28 in the moving assembly is 45°. This arrangement ensures that the driving blocks 5 are subjected to uniform force when both ends of the shape memory alloy 28 are connected to the power device. This uniform force allows the plurality of driving blocks 5 to work collaboratively and synchronously push the moving seat 2 up and down. During the horizontal movement of the driving blocks 5 in conjunction with the wedge-shaped inclined surface to raise and lower the moving seat 2, the uniform force ensures that each driving block 5 exerts a consistent force on the moving seat 2, thereby making the movement of the moving seat 2 more stable in the height direction.

[0153] like Figure 20 , Figure 21 As shown, in some embodiments, in the moving assembly, the driving direction of the plurality of driving blocks 5 is parallel to the extension direction of the shape memory alloy 28, i.e., the included angle is 0°. Using this scheme, one end of the shape memory alloy 28 can be fixedly connected to the base 1, and the other end can be connected to the power device, thus allowing the shape memory alloy 28 driving blocks 5 to move along their own extension direction. The advantage of this scheme is that the force transmission is direct, without the need for force decomposition, and theoretically, high driving efficiency can be achieved. Moreover, this arrangement makes the driving structure simpler and more intuitive in terms of mechanical analysis and control, and easier to understand and implement.

[0154] The principle of the lifting optical platform provided in this embodiment is as follows:

[0155] Lifting principle: Multiple drive blocks 5 move horizontally in the same direction, cooperating with the wedge-shaped inclined surface to cause the moving seat 2 to rise and fall relative to the base 1 in the height direction. By precisely controlling the moving distance of the drive blocks 5, the lifting height of the moving seat 2 can be accurately adjusted.

[0156] Limiting principle: The limiting part 7 restricts the horizontal movement of the movable seat 2, enhancing the stability of the platform structure. The limiting part 7 can be composed of limiting surfaces at angles on different sides of the movable seat 2, limiting the movable seat 2 from multiple directions and preventing it from swinging during lifting and lowering.

[0157] Function of biasing component: The biasing component (such as leaf spring, magnetic component) is connected to the movable seat 2, providing biasing force to move the movable seat 2 toward the base 1, compensating for manufacturing and assembly gaps, ensuring that the movable seat 2 fits tightly with the base 1, and assisting the movable seat 2 to descend.

[0158] Drive control principle: The shape memory alloy 28 is connected to the drive block 5, and one end is connected to a power device (such as a linear motor, piezoelectric motor, or stepper motor). The power device drives the shape memory alloy 28 to move, which in turn drives the drive block 5 to move.

[0159] Example 2

[0160] like Figure 22 As shown, this embodiment also provides a camera module, including: a housing 17 and a lifting optical platform as described in any of the above solutions. The optical components 3 in the lifting optical platform are exposed outside the housing 17.

[0161] The camera module provided in this embodiment has all the advantages of the aforementioned lifting optical platform because it adopts the lifting optical platform described above.

[0162] Example 3

[0163] This embodiment provides an electronic device, including the camera module described in the above solution. Specifically, the electronic device can be a mobile phone, a camera, etc.

[0164] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A lifting optical platform, characterized in that, include: Base (1); A movable seat (2) is disposed on the base (1); An optical device (3) is connected to the movable base (2), and the optical device (3) moves together with the movable base (2); A drive assembly (4) is disposed between the base (1) and the movable seat (2). The drive assembly (4) includes a plurality of drive blocks (5) spaced apart. The plurality of drive blocks (5) are connected as a whole by a connecting plate (12). At least one of the base (1), the movable seat (2) and the drive block (5) has a wedge-shaped inclined surface. The plurality of drive blocks (5) move horizontally in the same direction to cooperate with the wedge-shaped inclined surface, so that the movable seat (2) moves up and down relative to the base (1) in the height direction. A limiting part (7) is provided on the side of the movable seat (2) to limit the movement of the movable seat (2) relative to the base (1) in the horizontal direction; A biasing element is connected to the movable seat (2) and has a biasing force that causes the movable seat (2) to move closer to the base (1).

2. The lifting optical platform according to claim 1, characterized in that, The drive block (5) has a first protrusion (8) that slides against the base (1), and the drive block (5) also has a second protrusion (18) that slides against the movable seat (2). The movable seat (2) has a first wedge-shaped inclined surface (6) formed thereon, and the movable seat (2) slides with the first protrusion (8) through the first wedge-shaped inclined surface (6); A plane or a second wedge-shaped inclined surface (19) is formed on the base (1), and the base (1) slides with the second protrusion (18) through the plane or the second wedge-shaped inclined surface (19).

3. The lifting optical platform according to claim 2, characterized in that, The first protrusion (8) and the second protrusion (18) are balls or cylinders mounted on the drive block (5).

4. The lifting optical platform according to claim 2, characterized in that, The drive block (5) has a first limiting groove (9), and the first limiting groove (9) has at least two balls or rollers. One end of the two balls or rollers rolls against each other, and the other end rolls against the wedge-shaped inclined surfaces of the base (1) and the moving seat (2).

5. The lifting optical platform according to claim 1, characterized in that, The movable seat (2) has a third protrusion (20) for sliding contact with the drive block (5), and the base (1) has a fourth protrusion (21) for sliding contact with the drive block (5). A third wedge-shaped inclined surface (22) is formed on the drive block (5), and the drive block (5) slides with the third protrusion (20) of the moving seat (2) through the third wedge-shaped inclined surface (22); The driving block (5) has a plane or a fourth wedge-shaped inclined surface (23) formed on it, and the driving block (5) slides with the fourth protrusion (21) of the base (1) through the plane or the fourth wedge-shaped inclined surface (23).

6. The lifting optical platform according to claim 1, characterized in that, The movable seat (2) has a first wedge-shaped inclined surface (6), and the drive block (5) has a third wedge-shaped inclined surface (22). The first wedge-shaped inclined surface (6) and the third wedge-shaped inclined surface (22) are parallel to each other, and at least one first rolling element (10) is between the first wedge-shaped inclined surface (6) and the third wedge-shaped inclined surface (22). The base (1) has a second wedge-shaped inclined surface (19), and the drive block (5) has a fourth wedge-shaped inclined surface (23). The second wedge-shaped inclined surface (19) and the fourth wedge-shaped inclined surface (23) are parallel to each other, and at least one second rolling element (11) is between the second wedge-shaped inclined surface (19) and the fourth wedge-shaped inclined surface (23).

7. The lifting optical platform according to claim 6, characterized in that, The first rolling element (10) and the second rolling element (11) are balls or rollers.

8. The lifting optical platform according to any one of claims 1-7, characterized in that, The limiting part (7) includes a first limiting surface (13) located on the first side of the movable seat (2) and a second limiting surface (14) located on the second side of the movable seat (2), wherein the first limiting surface (13) and the second limiting surface (14) are at an angle.

9. The lifting optical platform according to claim 8, characterized in that, The first limiting surface (13) and / or the second limiting surface (14) have at least two spaced apart.

10. The lifting optical platform according to claim 8, characterized in that, The movable seat (2) has a fifth protrusion (15) protruding toward the first limiting surface (13) on its first side, and a sixth protrusion (24) protruding toward the second limiting surface (14) on its second side, wherein at least one of the fifth protrusion (15) and the sixth protrusion (24) has at least two spaced apart.

11. The lifting optical platform according to claim 10, characterized in that, The fifth protrusion (15) and the sixth protrusion (24) are ball bearings, and the side of the movable seat (2) has a second limiting groove (16) for accommodating the ball bearings.

12. The lifting optical platform according to claim 8, characterized in that, The first limiting surface (13) has a first guide groove (25) extending along the height direction, and the first side of the movable seat (2) has a second guide groove (26) opposite to the first guide groove (25). The first guide groove (25) and the second guide groove (26) contain ball bearings; the second limiting surface (14) is a plane that is in close contact with the second side of the movable seat (2).

13. The lifting optical platform according to claim 8, characterized in that, The first limiting surface (13) is an arc-shaped surface extending along the height direction, and the first side of the movable seat (2) has a third guide groove (27) extending along the height direction, and the arc-shaped surface is accommodated in the third guide groove (27); the second limiting surface (14) is an arc-shaped surface that is close to the second side of the movable seat (2).

14. The lifting optical platform according to any one of claims 1-7, characterized in that, Also includes: A shape memory alloy (28) is connected to the drive block (5). At least one end of the shape memory alloy (28) is connected to a power device, which drives the shape memory alloy (28) to move, thereby driving the drive block (5) to move.

15. A camera module, characterized in that, include: The housing (17) and the lifting optical platform according to any one of claims 1-14.

16. An electronic device, characterized in that, include: The camera module as described in claim 15.

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