Lens driving mechanism, lens module, imaging device and movable platform

Abstract

The embodiment of the utility model provides a lens driving mechanism, a lens module, an imaging device and a movable platform, and the lens driving mechanism comprises a movable part which is used for installing a lens or an image sensor; the guide rod is matched with the movable part so that the movable part can move in the extending direction of the guide rod; the driving part is connected with the movable part and used for driving the movable part to move; the transmission assembly comprises a plurality of rolling bodies, at least part of the rolling bodies are movably connected between the movable component and the guide rod, and the rolling bodies are in rolling fit with the movable component and the guide rod at the same time; in the process that the movable part moves in the extending direction of the guide rod, the multiple rolling bodies circularly roll along the annular track. According to the lens driving mechanism provided by the embodiment of the invention, the driving load of the driving part is reduced, the movement stroke of the movable part is not influenced by the limitation of the plurality of rolling bodies, and the long-stroke movement required by the lens driving mechanism can be effectively supported.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of imaging technology, and particularly relates to a lens driving mechanism, a lens module, an imaging device and a movable platform. BACKGROUND

[0002] With the rapid development of imaging technology, various types of shooting devices are widely used in various application scenarios. Among them, the shooting device meets the shooting clarity under different shooting conditions through focusing or zooming.

[0003] In the related art, in order to ensure the stability of the lens movement during focusing or zooming, a ball structure can be provided to drive the lens movement. However, when the zooming or focusing range of the shooting device is wide, the displacement of the lens or lens group in the optical axis direction during zooming or focusing is also large. When there is a large difference between the displacement of the lens or lens group and the displacement of the ball, the lens is prone to tilt, which affects the stability of focusing and causes imaging blur. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to provide a lens driving mechanism, a lens module, an imaging device and a movable platform to solve the problem of poor stability of the lens group during focusing affecting the imaging effect.

[0005] In order to solve the above technical problems, the present application is implemented as follows:

[0006] In a first aspect, the present application discloses a lens driving mechanism, comprising:

[0007] a movable component, the movable component being used for mounting a lens or an image sensor;

[0008] a guide rod, cooperating with the movable component to enable the movable component to move along the extension direction of the guide rod;

[0009] a driving component, connected with the movable component, the driving component being used for driving the movable component to move;

[0010] and a transmission assembly, the transmission assembly comprising a plurality of rolling bodies, at least part of the rolling bodies being movably connected between the movable component and the guide rod, and simultaneously rolling with the movable component and the guide rod;

[0011] In the process of the movable component moving along the extension direction of the guide rod, the plurality of rolling bodies circulate and roll along the annular track.

[0012] Optionally, in the process of the movable component moving along the extension direction of the guide rod, there are always a plurality of rolling bodies cooperating with the movable component and the guide rod, respectively, or there are always rolling bodies cooperating with the guide rod at the preset positions of the movable component.

[0013] Optionally, a pre-tightening component is further included, which is arranged on the movable component or the guide rod, and is configured to provide a pre-tightening force from the movable component to the guide rod or from the guide rod to the movable component during the movement of the movable component along the extension direction of the guide rod.

[0014] Optionally, the pre-tightening component comprises at least one of an elastic component and a magnetic component; wherein,

[0015] the elastic component is configured to provide an elastic pre-tightening force for moving the movable component and the guide rod closer to each other during the movement of the movable component along the extension direction of the guide rod;

[0016] the magnetic component comprises a first magnetic part and a second magnetic part, the first magnetic part and the second magnetic part are arranged on one of the movable component and the guide rod respectively, and the first magnetic part and the second magnetic part are mutually attracted to generate a pre-tightening force.

[0017] Optionally, among the plurality of rolling bodies, any adjacent rolling bodies are in rolling contact with each other in the annular track; or,

[0018] the plurality of rolling bodies are arranged in a single layer one by one in the extension direction of the annular track; or,

[0019] the plurality of rolling bodies are laid along the extension direction of the annular track to fill the annular track.

[0020] Optionally, the annular track is formed in the movable component.

[0021] Optionally, the annular track comprises an open section and a closed section connected end to end, the open section has an opening exposed on the surface of the movable component, and the closed section extends from the opening to the inside of the movable component, wherein the movable component and the guide rod are rollingly connected through the rolling bodies in the open section.

[0022] Optionally, the rolling bodies are balls, and the width of the opening is smaller than the diameter of the balls; or the rolling bodies are rollers, and the width of the opening is smaller than the height of the rollers.

[0023] Optionally, the number of the transmission assemblies is at least two, and the at least two transmission assemblies are arranged at intervals in the circumferential direction of the guide rod, and the at least two transmission assemblies clamp the guide rod to move during the movement of the movable component along the extension direction of the guide rod.

[0024] Optionally, the at least two transmission assemblies correspond to different annular tracks respectively, and the annular tracks are arranged at an angle with respect to each other.

[0025] Optionally, the movable component includes two ends arranged away from each other along the extension direction of the guide rod, and the two ends of the movable component are respectively provided with the two transmission assemblies.

[0026] Optionally, the number of the guide rods is at least two, the at least two guide rods are arranged at intervals along the circumference of the movable component, and the at least two guide rods are respectively matched with the movable component through the rolling bodies of the transmission assemblies.

[0027] In a second aspect, the present application further discloses a lens module, comprising: at least one lens, and a lens driving mechanism as described above; wherein,

[0028] The lens driving mechanism is connected with the at least one lens, and is used to drive the at least one lens to move along the extension direction of the guide rod.

[0029] In a third aspect, the present application further discloses an imaging device, comprising: at least one lens, an image sensor, and a lens driving mechanism as described above; wherein,

[0030] The lens driving mechanism is connected with the at least one lens or the image sensor, and is used to drive the at least one lens or the image sensor to move along the extension direction of the guide rod.

[0031] In a fourth aspect, the present application further discloses a movable platform, comprising: a lens driving mechanism, a lens module or an imaging device as described above.

[0032] In the embodiments of the present application, the lens driving mechanism is provided with a transmission assembly, and the transmission assembly includes a plurality of rolling bodies, at least part of the rolling bodies are simultaneously matched with the movable component and the guide rod, so that the friction between the components is reduced during the process that the driving component drives the movable component to move along the extension direction of the guide rod, and the driving load of the driving component is reduced. At the same time, since the plurality of rolling bodies circulate and roll in the annular track, the movement stroke of the movable component will not be affected by the limiting of the plurality of rolling bodies, and the long-stroke movement required by the lens driving mechanism can be effectively supported. In addition, the design of the annular track provides a clear rolling path for the rolling bodies, and ensures the stability and controllability of the rolling bodies during the movement.

[0033] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0035] Figure 1 This is a schematic diagram of the lens driving mechanism in an embodiment of this application;

[0036] Figure 2 This is a schematic diagram illustrating the cooperation between the moving parts and the transmission assembly in an embodiment of this application;

[0037] Figure 3 This is a front view of the lens driving mechanism in an embodiment of this application;

[0038] Figure 4 for Figure 3 Enlarged diagram of section C;

[0039] Figure 5 for Figure 3 Sectional view A-A;

[0040] Figure 6 for Figure 5 Enlarged schematic diagram of section D in the middle;

[0041] Figure 7 for Figure 5 Sectional view of B-B;

[0042] Figure 8 for Figure 7 Enlarged schematic diagram of section E in the middle;

[0043] Figure 9 This is a schematic diagram showing the position of the guide rod in an embodiment of this application.

[0044] Reference numerals: 100 - Lens drive mechanism, 10 - Moving part, 11 - Bearing part, 12 - Moving part, 20 - Guide rod, 30 - Drive component, 40 - Transmission assembly, 41 - Rolling element, 50 - Circular track, 51 - Open section, 52 - Closed section, 60 - Pre-tightening component. Detailed Implementation

[0045] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0046] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0047] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] This application provides a lens driving mechanism for use in a lens module, imaging device, or movable platform. The lens driving mechanism can be connected to a lens or image sensor and drive the lens or image sensor to move along the optical axis to achieve focusing or autofocusing functions. The lens driving mechanism disclosed in this application can achieve focusing and autofocusing while ensuring the stability of the lens or image sensor during movement, thereby improving the imaging effect.

[0050] The lens driving mechanism provided in the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0051] Reference Figure 1 The diagram shows a schematic representation of the lens driving mechanism 100 in an embodiment of this application. Figure 2 This shows a schematic diagram of the cooperation between the movable part 10 and the transmission assembly 40 in an embodiment of this application, such as... Figure 1 and Figure 2As shown, the lens driving mechanism disclosed in this application includes: a movable part 10, a guide rod 20, a driving part 30, and a transmission assembly 40. The movable part 10 is used to mount a lens or image sensor; the guide rod 20 cooperates with the movable part 10 to allow the movable part 10 to move along the extension direction of the guide rod 20; the driving part 30 is connected to the movable part 10 and is used to drive the movable part 10 to move; the transmission assembly 40 may include a plurality of rolling elements 41, and at least some of the rolling elements 41 are movably connected between the movable part 10 and the guide rod 20, and simultaneously roll in cooperation with both the movable part 10 and the guide rod 20. During the movement of the movable part 10 along the extension direction of the guide rod 20, the plurality of rolling elements 41 circulate along the annular track 50.

[0052] The movable component 10 is used to mount a lens or image sensor and is the core load-bearing part of the lens drive mechanism. The guide rod 20 cooperates with the movable component 10 to ensure that the movable component 10 moves in a preset direction, that is, the extension direction of the guide rod 20. The drive component 30 is connected to the movable component 10 and provides power to drive the movable component 10 to move. The multiple rolling elements 41 in the transmission assembly 40 roll and cooperate between the movable component 10 and the guide rod 20, which can reduce friction and improve motion efficiency. In particular, the rolling elements 41 circulate along the annular track 50, which helps to maintain the continuity and stability of the movement of the movable component 10.

[0053] The lens driving mechanism in this application embodiment can be used or sold as a separate accessory, or it can be mounted on a carrier for use or sale. Exemplarily, the carrier includes a lens module, an imaging device, or a movable platform. By applying this lens driving mechanism to a lens module, imaging device, or movable platform, when the lens needs to focus or zoom, the movement of the movable part 10 in the lens driving mechanism along the extension direction of the guide rod 20 can drive the lens and / or image sensor to move along the extension direction of the guide rod 20. Furthermore, the rolling element 41 within the annular track 50 enables fast and stable focusing or zooming operations. The movable platform can include aircraft and ground-based movable platforms (vehicles, etc.). Aircraft can include unmanned aerial vehicles (UAVs) and manned aircraft. UAVs include rotorcraft, such as quadcopter, hexacopter, and octocopter UAVs, or fixed-wing UAVs, or a combination of rotorcraft and fixed-wing UAVs.

[0054] Specifically, such as Figures 1 to 4As shown, the movable component 10 includes a support portion 11 and a moving portion 12 connected to each other. The support portion 11 is provided with a through hole for mounting a lens or image sensor. The through hole is configured with a shape adapted to the lens or image sensor to facilitate the connection between components. For example, in this embodiment, the through hole of the support portion 11 is designed to be circular to adapt to the shape of most lenses. The moving portion 12 is set at an angle to the support portion 11 and passes through the guide rod 20. The moving portion 12 can move along the extension direction of the guide rod 20 and drive the support portion 11 connected to it to move, thereby realizing the movement of the lens or image sensor. The length of the moving portion 12 is less than the length of the guide rod 20 to ensure that the movable component 10 can be displaced to a certain extent along the extension direction of the guide rod 20.

[0055] It should be noted that in actual use, when the movable part 10 directly engages with the guide rod 20 and moves along the extension direction of the guide rod 20, the gap between the movable part 10 and the guide rod 20 may cause unexpected vibration of the movable part 10 during movement, resulting in blurred images and affecting the imaging effect. To solve this problem, reducing the gap can reduce the vibration frequency or amplitude of the movable part 10 and improve the imaging quality, but the influence of ambient temperature on the gap size still exists. Furthermore, an external force can be applied to the movable part 10 toward the guide rod 20 to reduce or even eliminate the gap between them, but the effectiveness of this method is reduced when the lens or image sensor carried by the movable part 10 has a large mass. Specifically, to avoid vibration of the movable part 10, it is necessary to increase the external force applied to the movable part 10. While increasing the external force can reduce or eliminate the gap, it also increases the friction between the movable part 10 and the guide rod 20, affecting the flexibility of the movable part 10's movement and increasing the driving load on the drive component 30. Under long-term operation of the mechanism, this can easily cause wear on the components and affect their service life. One improvement is to provide a rolling element 41 between the movable part 10 and the guide rod 20. When the rolling element 41 rolls with both the movable part 10 and the guide rod 20, it applies an external force to the movable part 10 to eliminate the gap and reduce the friction between the parts, thereby solving the vibration problem when the movable part 10 has a large mass.

[0056] However, when the moving part 10 in the lens drive mechanism has a long stroke, such as when the lens drive mechanism is applied to a telephoto lens or a drone, the displacement of the moving part 10 and the rolling body 41 during the movement is significantly different. This can cause the supporting effect of the rolling body 41 on the moving part 10 to fail, causing the moving part 10 to separate from the rolling body 41 and tilt, thus affecting the imaging quality.

[0057] In this embodiment, a transmission assembly 40 is provided, which includes multiple rolling elements 41. At least some of the rolling elements 41 simultaneously roll in cooperation with the movable part 10 and the guide rod 20. This reduces the friction between the parts and lowers the driving load of the driving part 30 when the driving part 30 drives the movable part 10 to move along the extension direction of the guide rod 20. At the same time, since the multiple rolling elements 41 circulate within the annular track 50, the stroke of the movable part 10 is not affected by the limiting effect of the multiple rolling elements 41, effectively supporting the long stroke required by the lens driving mechanism. Furthermore, the design of the annular track 50 provides a clear rolling path for the rolling elements 41, ensuring the stability and controllability of the rolling elements 41 during movement.

[0058] It should be noted that, in the embodiments of this application, the rolling element 41 can be a ball, roller, needle, etc., as long as it can circulate within the annular track 50 and simultaneously roll in cooperation with the moving part 10 and the guide rod 20. This application does not limit the specific type of the rolling element 41.

[0059] Since the rolling elements 41 are located between the movable component 10 and the guide rod 20, and roll in cooperation with both the movable component 10 and the guide rod 20 respectively, the stability of the movable component 10's movement along the extension direction of the guide rod 20 is actually affected by the number of rolling elements 41. It is understandable that the more rolling elements 41 there are between the movable component 10 and the guide rod 20, the more stable the support provided by the rolling elements 41 to the movable component 10. Therefore, in some embodiments of this application, during the movement of the movable component 10 along the extension direction of the guide rod 20, there are always multiple rolling elements 41 cooperating with both the movable component 10 and the guide rod 20.

[0060] In the embodiments of this application, such as Figure 4 As shown, during the movement of the movable part 10 along the extension direction of the guide rod 20, the multiple rolling elements 41 in the annular track 50 are subjected to friction and roll. Since there are always multiple rolling elements 41 between the movable part 10 and the guide rod 20, and the multiple rolling elements 41 roll in cooperation with the movable part 10 and the guide rod 20 at the same time, the movable part 10 can be supported by multiple rolling elements 41 at the same time, so that the movable part 10 can maintain better balance during the movement and improve the support stability.

[0061] In some embodiments, during the movement of the movable component 10 along the extension direction of the guide rod 20, the preset position of the movable component 10 always has the rolling element 41 cooperating with the guide rod 20. The preset position of the movable component 10 is the support position between the movable component 10 and the guide rod 20. When the preset position of the movable component 10 always has the rolling element 41 cooperating with the guide rod 20, that is, the movable component 10 is always in contact with the rolling element 41 at the preset position, the support position of the movable component 10 can remain unchanged, thereby reducing the vibration of the movable component 10 caused by the change of the support position.

[0062] In this embodiment, the lens drive mechanism further includes a pre-tensioning component 60. The pre-tensioning component 60 is disposed on the movable component 10 or the guide rod 20. The pre-tensioning component 60 provides a pre-tensioning force from the movable component 10 toward the guide rod 20, or a pre-tensioning force from the guide rod 20 toward the movable component 10, during the movement of the movable component 10 along the extension direction of the guide rod 20. By providing the pre-tensioning component 60, the gap between the movable component 10 and the guide rod 20 can be eliminated, thereby preventing vibration of the movable component 10 caused by the existence of the gap. Figure 7 and Figure 8 As shown, the pre-tightening component 60 can be positioned at the location indicated by the dashed box in the figure, wherein... Figure 7 and Figure 8 In the lens drive mechanism, two sets of rolling elements 41 are circumferentially spaced on the guide rod 20. A pre-tensioning component 60 is disposed between the two sets of rolling elements 41, and the pre-tensioning force provided by the pre-tensioning component 60 is directed towards the center of the bearing portion 11 of the movable component 10. During the movement of the movable component 10 along the extension direction of the guide rod 20, the pre-tensioning force on both sides of the pre-tensioning component 60 is more balanced, thereby improving the stability of the relative movement between the movable component 10 and the guide rod 20. It should be understood that the position shown in the figure is only an example, and this application does not limit the specific position of the pre-tensioning component 60. Those skilled in the art can flexibly design it in conjunction with the position of the annular track 50.

[0063] In practical applications, the preload can be either elastic or magnetic, as long as it causes the moving part 10 and the guide rod 20 to tend to move closer together. Furthermore, the preload component 60 includes at least one of an elastic element and a magnetic element.

[0064] The elastic element provides an elastic preload that brings the movable part 10 and the guide rod 20 closer together as the movable part 10 moves along the extension direction of the guide rod 20.

[0065] Specifically, the elastic element can be disposed between the movable part 10 and the guide rod 20, and connected to both the movable part 10 and the guide rod 20 respectively. During the movement of the movable part 10 along the extension direction of the guide rod 20, the elastic element is always in a stretched state. Understandably, because the elastic element is always in a stretched state, it always maintains an elastic restoring force. This elastic restoring force makes the elastic element always tend to return to its original state, and ensures that the movable part 10 and the guide rod 20 tend to move closer to each other, thereby reducing or eliminating the gap between them, reducing the vibration amplitude of the movable part 10, or even preventing the movable part 10 from vibrating.

[0066] The magnetic component includes a first magnetic part and a second magnetic part. The first magnetic part and the second magnetic part are respectively disposed in one of the movable part 10 and the guide rod 20. The first magnetic part and the second magnetic part attract each other to generate a magnetic preload.

[0067] Specifically, the first magnetic part can be a magnet, and the second magnetic part can be a magnetic metal. The magnet can attract the magnetic metal so that an attraction is generated between the movable part 10, which is provided with the magnet and the magnetic metal, and the guide rod 20, thereby having a tendency to move closer to each other to eliminate the gap between them. Further, in the embodiments of this application, the movable part 10 moves along the extension direction of the guide rod 20 to complete focusing or adjusting the focus. Therefore, at least a portion of the guide rod 20 can be made of a magnet, and the movable part 10 includes a magnetic metal material. During the movement of the movable part 10, the position of the guide rod 20 is determined, and it can generate an attraction force on the movable part 10, thereby eliminating the gap between the movable part 10 and the guide rod 20.

[0068] Optionally, among the multiple rolling elements 41, any adjacent rolling elements 41 roll in contact with each other in the annular track 50. Since the rolling elements 41 support the moving part 10, when any adjacent rolling elements 41 maintain mutual rolling contact in the annular track 50, the support effect of the rolling elements 41 on the moving part 10 is better, which improves the stability of the movement of the moving part 10 and thus helps to ensure the imaging quality.

[0069] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, along the extension direction of the annular track 50, multiple rolling elements 41 are arranged one in a single layer, or multiple rolling elements 41 cover the entire annular track 50. Thus, the multiple rolling elements 41 can form a stable and continuous rolling support structure within the annular track 50. This structure helps reduce vibration of the moving part 10 during movement and improves the stability of the lens drive mechanism. Furthermore, since the rolling elements 41 cover the entire annular track 50, it ensures that there are enough rolling elements 41 to support the moving part 10 throughout the entire movement, improving the image stabilization reliability of the mechanism.

[0070] Optionally, the annular track 50 is formed on the movable part 10 or the guide rod 20, and at least partially exposed outside the movable part 10 or the guide rod 20, so that the rolling element 41 within the annular track 50 can simultaneously roll in cooperation with both the movable part 10 and the guide rod 20. It should be noted that by directly providing the annular track 50 on the movable part 10 or the guide rod 20, the lens drive mechanism no longer needs a separate structure for mounting the rolling element 41, thereby simplifying the structure of the transmission assembly 40 and even the entire lens drive mechanism, and improving overall compactness.

[0071] In the embodiments of this application, such as Figures 5 to 8 As shown, the annular track 50 is formed on the movable part 10. This integrated structure of the annular track 50 and the movable part 10 reduces assembly errors between parts, thereby improving the smoothness of the rolling element 41 during cyclic rolling. Furthermore, since the guide rod 20, as a guiding structure, can fulfill its guiding function with a small diameter, if the annular track 50 were placed on the guide rod 20, the length of the annular track 50 would need to be increased to ensure that the rolling element 41 maintains rolling contact with the movable part 10, since the movable part 10 needs to move along the extension direction of the guide rod 20. Conversely, when the annular track 50 is placed on the movable part 10, the rolling element 41 is always located between the movable part 10 and the guide rod 20 during the movement of the movable part 10 along the extension direction of the guide rod 20, ensuring the reliability of the structure.

[0072] Furthermore, the annular track 50 includes an open section 51 and a closed section 52 connected end to end. The open section 51 has an opening exposed on the surface of the movable member 10, and the closed section 52 extends from the opening into the interior of the movable member 10. The movable member 10 and the guide rod 20 are in rolling engagement through the rolling element 41 in the open section 51.

[0073] Specifically, the movable part 10 has an opening groove and an internal channel, which are connected to each other and together form a ring track 50. The opening groove is located on the surface of the movable part 10 near the guide rod 20 and extends along the extension direction of the guide rod 20. The opening groove has an opening and forms an opening section 51, in which multiple rolling elements 41 can roll and cooperate with the guide rod 20 through the opening. The internal channel extends from the surface of the movable part 10 into the interior of the movable part 10 and connects the two ends of the opening groove to form a closed section 52.

[0074] like Figure 4 and Figure 5As shown, multiple rolling elements 41 are arranged sequentially along the extension direction of the annular track 50. Some rolling elements 41 are located within the closed section 52, while others are located within the open section 51 and exposed outside the opening. The rolling elements 41 exposed outside the opening can contact the guide rod 20 and simultaneously roll in cooperation with both the movable member 10 and the guide rod 20 as the movable member 10 moves along the extension direction of the guide rod 20. Furthermore, since the multiple rolling elements 41 circulate within the annular track 50, they alternately roll between the open section 51 and the closed section 52. For example, along the direction of movement of the movable member 10, the rolling element 41 near the front end of the open section 51 continues rolling and enters the closed section 52, while the rolling element 41 near the front end of the closed section 52 continues rolling and enters the open section 51, remaining exposed outside the opening.

[0075] It should be understood that the annular track 50 in this embodiment is not limited to a circular ring. In practical applications, the annular track 50 can be a circular track, an elliptical track, or a polygonal track with rounded chamfers, such as the shape of a playground track. And / or, the annular track 50 can be formed by V-shaped grooves or trapezoidal grooves, so that the rolling element 41 can make close contact with the inclined surface of the V-shaped groove or trapezoidal groove due to gravity or external force, thereby improving the stability of the rolling element 41 during rolling. It should be noted that along the length direction, the annular track 50 forms a channel for the rolling element 41 to circulate, and the V-shaped groove or trapezoidal groove here refers to the cross-sectional shape of the annular track 50 along the width direction.

[0076] In some embodiments of this application, the rolling element 41 is a ball, and the width of the opening is smaller than the diameter of the ball. The ball has a low coefficient of rolling friction, resulting in less frictional resistance between it and the moving part 10 and the guide rod 20 during rolling engagement. This helps improve the motion efficiency of the lens drive mechanism and reduces the driving load on the drive part 30, contributing to the overall lightweighting and miniaturization of the lens drive mechanism. Specifically, multiple rolling elements 41 are arranged sequentially along the length of the opening, with the width direction of the opening intersecting the length direction. Furthermore, the width direction of the opening is perpendicular to the length direction. Understandably, since the diameter of the ball is larger than the width of the opening, it ensures that the ball is confined within the annular track 50, preventing the ball from detaching from the annular track 50 at the opening, thus enhancing the stability and reliability of the lens drive mechanism.

[0077] In other embodiments of this application, the rolling element 41 is a roller, and the width of the opening is less than the height of the roller. The roller has a cylindrical structure, which, compared to a conventional roller, allows for a larger contact area with the moving part 10 and the guide rod 20, thus providing higher load-bearing capacity and stability. During the movement of the lens drive mechanism, the moving part 10 can move more smoothly along the extension direction of the guide rod 20, especially when it needs to withstand large loads or perform high-speed movements. The roller design can more effectively prevent positioning errors caused by vibration or impact, improving the reliability of the entire mechanism. In this embodiment, the height of the roller is set along the width direction of the annular track 50, that is, the width direction of the opening is consistent with the height direction of the roller. In this case, since the height of the roller is greater than the width of the opening, it can ensure that the roller is confined within the annular track 50, preventing the roller from detaching from the opening and effectively avoiding mechanism failure caused by the rolling element 41 falling off.

[0078] Optionally, the number of transmission components 40 is at least two, and the at least two transmission components 40 are arranged circumferentially at intervals along the guide rod 20. During the movement of the movable part 10 along the extension direction of the guide rod 20, the at least two transmission components 40 clamp the guide rod 20 to move, thereby improving the stability of the interaction between the movable part 10 and the guide rod 20 and effectively avoiding the offset and shaking of the movable part 10 during the movement.

[0079] In the embodiments of this application, such as Figure 2 As shown, the extending direction of the moving part 12 of the movable component 10 is consistent with the extending direction of the guide rod 20 (not shown in the figure). The moving part 12 is provided with an arc-shaped groove, and the inner wall of the groove is adapted to the shape of the outer wall of the guide rod 20, such as... Figure 5 As shown, two transmission components 40 are spaced apart circumferentially along the guide rod 20, clamping the guide rod 20 from two directions, thereby improving the stability between the guide rod 20 and the moving part 10, and enhancing the stability and accuracy of the lens drive mechanism.

[0080] Furthermore, at least two transmission components 40 correspond to different annular tracks 50, and there is an angle between the planes containing the annular tracks 50 of the transmission components 40.

[0081] like Figure 5As shown, two transmission components 40 can be seen on the cross-section along the radial direction of the guide rod 20. Since at least two transmission components 40 correspond to different annular tracks 50, one transmission component 40 is set within one annular track 50. The plane containing the annular track 50 is shown by the dotted line in the figure. There is a preset angle between the planes containing the two annular tracks 50. The size of this angle is related to the dimensions of the moving part 10 and the guide rod 20. In practical applications, it can be flexibly designed to adapt to different application scenarios and performance requirements, thereby achieving the purpose of optimizing transmission efficiency, reducing noise, or enhancing structural compactness. In practical applications, the plane containing the annular track 50 can be designed to pass through the center of the guide rod 20, so that the clamping direction of the rolling element 41 in the annular track 50 on the guide rod 20 is also towards the center of the guide rod 20, thus ensuring the clamping effect on the guide rod 20.

[0082] Optionally, the movable component 10 includes two ends disposed opposite to each other along the extension direction of the guide rod 20. Two transmission components 40 are respectively provided at the two ends of the movable component 10, so that the movable component 10 can be supported and guided to move along the extension direction of the guide rod 20 from both ends simultaneously. The increase of support points reduces the problem of uneven force that may occur during the movement of the movable component 10, improves the accuracy and stability of the lens drive mechanism, and ultimately improves the imaging quality.

[0083] like Figure 2 As shown, the movable part 10 includes two ends disposed opposite to each other along the extension direction of the guide rod 20. The bearing part 11 is disposed at one end of the moving part 12. Two transmission components 40 are respectively disposed at both ends of the moving part 12. When transmission components 40 are disposed at both ends of the moving part 12, the pressure from the movable part 10 can be distributed to both ends of the moving part 12, which is also beneficial to improving the service life of the transmission components 40.

[0084] Optionally, there are at least two guide rods 20, which are spaced apart circumferentially along the movable part 10 and respectively cooperate with the movable part 10 through the rolling element 41 of the transmission assembly 40. The drive component 30 is correspondingly arranged with at least one of the at least two guide rods 20. The arrangement of at least two guide rods 20 and multiple transmission assemblies 40 improves the guiding accuracy of the guide rods 20 for the movable part 10.

[0085] In this embodiment, there are two guide rods 20. When the lens drive mechanism is mounted on the imaging device, the plane formed by the two guide rods 20 can form an angle with a preset horizontal plane. It should be noted that when the lens drive mechanism is applied to the imaging device, since the camera module housing in the imaging device is usually square, while the lens module is usually circular, the four corners of the camera module housing can have a certain amount of space. (Refer to...) Figure 9The diagram shows the position of the guide rod 20 in an embodiment of this application. Figure 9 As shown in this embodiment, the two guide rods 20 can be respectively set on the side perpendicular to the lens in the camera module housing, thereby reducing the compression of the lens module space and improving the utilization rate of the internal space of the camera module.

[0086] In this embodiment, the lens drive mechanism is provided with a transmission component 40, which includes a plurality of rolling elements 41. At least some of the rolling elements 41 simultaneously roll in cooperation with the movable part 10 and the guide rod 20. This reduces the friction between the components and lowers the drive load of the drive component 30 when the drive component 30 drives the movable part 10 to move along the extension direction of the guide rod 20. At the same time, since the multiple rolling elements 41 circulate within the annular track 50, the stroke of the movable part 10 is not affected by the limiting effect of the multiple rolling elements 41, effectively supporting the long stroke motion required by the lens drive mechanism. Furthermore, the design of the annular track 50 provides a clear rolling path for the rolling elements 41, ensuring the stability and controllability of the rolling elements 41 during movement.

[0087] This application also discloses a lens module, including: at least one lens, and the lens driving mechanism 100 as described above; wherein the lens driving mechanism 100 is connected to at least one lens and is used to drive at least one lens to move along the extension direction of the guide rod 20.

[0088] Specifically, at least one lens is disposed on the movable part 10 in the lens drive mechanism 100, and is provided with the power to move along the extension direction of the guide rod 20 by the drive part 30. By using the above-mentioned lens drive mechanism 100, high-precision and high-stability position adjustment and motion control of the lens can be achieved.

[0089] This application also discloses an imaging device, including: at least one lens, an image sensor, and a lens drive mechanism 100 as described above; wherein the lens drive mechanism 100 is connected to at least one lens or image sensor and is used to drive at least one lens or image sensor to move along the extension direction of the guide rod 20.

[0090] For lens assemblies or imaging devices, the lens drive mechanism 100 is suitable for long-stroke movements, enabling it to support a wider range of zoom and / or focus strokes. The motion stability of the moving parts 10 of the lens drive mechanism 100 ensures reduced unintended jitter during the movement of the lens or image sensor of the lens assembly, thereby minimizing the impact on image performance during zooming or focusing. This allows the imaging device to possess better zoom and / or focus performance.

[0091] The imaging device in this application may include, but is not limited to, any one of a panoramic camera, an action camera, an electronic terminal device, and a video camera. The lens drive mechanism 100 can be used to install and support the lens or image sensor and drive it to move along the extension direction of the guide rod 20 to achieve focusing or zooming functions. Since the rolling element 41 is set in the annular track 50, the difference in displacement between the moving part 10 and the rolling element 41 during movement is eliminated, so that the transmission component 40 and the moving part 10 can maintain contact and support, preventing imaging blur caused by lens or image sensor jitter and ensuring the clarity of the image.

[0092] This application also discloses a mobile platform, including: the lens drive mechanism 100, lens module, or imaging device as described above. The mobile platform can be a drone, unmanned vehicle, gimbal bracket, etc., and can be used to mount the lens drive mechanism 100, lens module, or imaging device as described above to improve shooting quality and ensure imaging effects when shooting is required. Due to its high stability and elimination of the difference in displacement between the moving part 10 and the rolling element 41, it is also applicable under conditions requiring long-distance zoom, expanding its application scenarios.

[0093] It should be noted that in the embodiments of this application, the movable platform and imaging device include the lens driving mechanism 100 as described above, and therefore have similar beneficial effects as the lens driving mechanism 100 described above, which will not be elaborated here.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A lens driving mechanism, characterized in that, include: A movable component for mounting a lens or image sensor; A guide rod, which cooperates with the movable component, so that the movable component can move along the extension direction of the guide rod; A driving component is connected to the movable component, and the driving component is used to drive the movable component to move. And a transmission assembly, the transmission assembly including a plurality of rolling elements, at least some of the rolling elements being movably connected between the movable component and the guide rod, and simultaneously engaging in rolling cooperation with the movable component and the guide rod; During the movement of the movable component along the extension direction of the guide rod, the plurality of rolling elements circulate along the annular track.

2. The lens driving mechanism according to claim 1, characterized in that, During the movement of the movable component along the extension direction of the guide rod, there are always multiple rolling elements that cooperate with the movable component and the guide rod respectively, or, at a preset position of the movable component, there are always rolling elements that cooperate with the guide rod.

3. The lens driving mechanism according to claim 1, characterized in that, It also includes a pre-tensioning component, which is disposed on the movable component or the guide rod. The pre-tensioning component is used to provide a pre-tensioning force from the movable component toward the guide rod to the movable component or to the guide rod toward the movable component during the movement of the movable component along the extension direction of the guide rod.

4. The lens driving mechanism according to claim 3, characterized in that, The pre-tightening component includes at least one of an elastic element and a magnetic element; wherein... The elastic element is used to provide an elastic preload force that brings the movable part and the guide rod closer together as the movable part moves along the extension direction of the guide rod. The magnetic component includes a first magnetic part and a second magnetic part, which are respectively disposed on one of the movable component and the guide rod. The first magnetic part and the second magnetic part attract each other to generate a preload force.

5. The lens driving mechanism according to claim 1, characterized in that, In the plurality of rolling elements, any adjacent rolling elements roll in contact with each other in the annular track; or, In the extending direction of the annular track, the multiple rolling elements are arranged in a single layer one by one; or, The multiple rolling elements are laid out along the extension direction of the annular track to cover the entire annular track.

6. The lens driving mechanism according to claim 1, characterized in that, The circular track is formed on the movable component.

7. The lens driving mechanism according to claim 6, characterized in that, The annular track includes an open section and a closed section connected end to end. The open section has an opening exposed on the surface of the movable component, and the closed section extends from the opening into the interior of the movable component. The movable component and the guide rod are in rolling engagement through the rolling elements within the open section.

8. The lens driving mechanism according to claim 7, characterized in that, The rolling element is a ball, and the width of the opening is smaller than the diameter of the ball; or, the rolling element is a roller, and the width of the opening is smaller than the height of the roller.

9. The lens driving mechanism according to claim 1, characterized in that, The number of transmission components is at least two, and the at least two transmission components are arranged circumferentially spaced along the guide rod. During the movement of the movable part along the extension direction of the guide rod, the at least two transmission components clamp the guide rod and move.

10. The lens driving mechanism according to claim 9, characterized in that, At least two of the transmission components correspond to different annular tracks, and there is an angle between the planes containing the annular tracks between the transmission components.

11. The lens driving mechanism according to claim 1, characterized in that, The movable component includes two ends disposed opposite to each other along the extension direction of the guide rod, and two transmission components are respectively disposed at each end of the movable component.

12. The lens driving mechanism according to claim 1, characterized in that, The number of guide rods is at least two, and the at least two guide rods are arranged at circumferential intervals along the movable component, and each of them cooperates with the movable component through the rolling element of the transmission assembly. The driving component is arranged corresponding to at least one of the at least two guide rods.

13. A lens module, characterized in that, include: At least one lens, and a lens driving mechanism as described in any one of claims 1-12; wherein, The lens drive mechanism is connected to at least one of the lenses and is used to drive at least one of the lenses to move along the extension direction of the guide rod.

14. An imaging device, characterized in that, include: At least one lens, an image sensor, and a lens driving mechanism as described in any one of claims 1-12; wherein, The lens drive mechanism is connected to at least one of the lenses or the image sensor and is used to drive at least one of the lenses or the image sensor to move along the extension direction of the guide rod.

15. A mobile platform, characterized in that, include: The lens driving mechanism as described in claim 12, or the lens module as described in claim 13, or the imaging device as described in claim 14.

Images