Hybrid prism driving structure, lens driving device and camera

Abstract

The utility model relates to a hybrid prism driving structure, a lens driving device and a camera. The hybrid prism driving structure comprises an X-axis rotating piece for supporting a prism, a Z-axis rotating piece for supporting the X-axis rotating piece, a base for supporting the Z-axis rotating piece, a spring for connecting the X-axis rotating piece, the Z-axis rotating piece and the base, an X-axis magnet for driving the X-axis rotating piece to rotate around the Y-axis direction relative to the base, and an X-axis coil, the Z-axis magnet and the Z-axis coil are used for driving the Z-axis rotating piece to rotate around the Z-axis direction relative to the base; the base movably supports the Z-axis rotating piece through two Z-axis balls and a Z-axis roller, and the Z-axis rotating piece movably supports the X-axis rotating piece through two X-axis balls. According to the utility model, a combined supporting mechanism of the balls and the pin rollers is adopted, so that the X-axis rotating piece and the Z-axis rotating piece are slightly influenced by friction force during angle adjustment, the smooth operation and the positioning accuracy of a system are ensured, and the stability of the whole driving structure is also favorably improved.

Description

Technical Field

[0001] The utility model relates to the field of cameras, and in particular to a hybrid prism driving structure, a lens driving device and a camera. Background Art

[0002] The challenges faced by traditional prism drive mechanisms primarily stem from the inherent limitations of their key component: the plastic shaft. Due to the physical properties of plastic materials, the difficulty in precisely controlling friction during prism rotation presents a thorny issue. This not only impacts the overall stability and accuracy of the system, but also directly leads to significant variability in the motor production process, increasing product inconsistency and potential failure rates, severely limiting the device's performance ceiling and market competitiveness. Faced with this industry pain point, there is an urgent need to seek innovative solutions to fundamentally address the friction control problem, thereby significantly improving the performance and production quality of the prism drive system. Utility Model Content

[0003] In view of this, the present invention provides a hybrid prism drive structure, which adopts a combined support mechanism of balls and rollers, so that the X-axis rotating parts and the Z-axis rotating parts are very little affected by friction when adjusting the angle, thereby ensuring the smooth operation and positioning accuracy of the system, and also helping to improve the stability of the entire drive structure.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A hybrid prism drive structure is used to support and drive a prism. The prism can adjust light incident along the X-axis direction to be transmitted along the Z-axis direction. The Y-axis direction, Z-axis direction and X-axis direction are perpendicular to each other. The incident light of the prism is incident from the front of the X-axis direction. The hybrid prism drive structure includes an X-axis rotating member for supporting the prism, a Z-axis rotating member supporting the X-axis rotating member, a base supporting the Z-axis rotating member, a spring connecting the X-axis rotating member, the Z-axis rotating member and the base, an X-axis magnet and an X-axis coil for driving the X-axis rotating member to rotate relative to the base about the Y-axis direction, and a Z-axis magnet and a Z-axis coil for driving the Z-axis rotating member to rotate relative to the base about the Z-axis direction; the base movably supports the Z-axis rotating member via two Z-axis balls and a Z-axis roller, and the Z-axis rotating member movably supports the X-axis rotating member via two X-axis balls.

[0006] The key to the design lies in the combined support mechanism of balls and rollers. These not only support the rotating components but also serve as their axis of rotation, allowing them to rotate around the balls and rollers. Because ball bearings roll rather than slide, they exhibit extremely low friction when carrying radial loads, significantly reducing wear between moving parts. Rollers, on the other hand, excel at carrying larger axial loads and also offer the advantage of a low coefficient of friction. This combination minimizes frictional effects during angular adjustment of the X- and Z-axis components, ensuring smooth system operation and positioning accuracy. In addition to reducing friction, this design also enhances the stability of the entire drive structure. Because both the balls and rollers can roll freely within their respective operating ranges, they effectively distribute stress concentrations caused by external impacts or internal imbalances, preventing excessive stress at a single point. This maintains the overall rigidity and geometric shape of the structure even under frequent dynamic operation, preventing loosening or deformation over time. The close fit between the ball and the roller, and the grease layer applied to the ball surface, can further reduce the wear rate and ensure smooth operation for long-term use.

[0007] Preferably, the two X-axis balls are arranged along the Y-axis direction, the X-axis rotating component is located above the X-axis balls, and the Z-axis rotating component is located below the X-axis balls.

[0008] Two X-axis ball bearings precisely aligned along the Y-axis provide a stable support platform and achieve a delicate mechanical balance between the X- and Z-axis rotating components. This layout ensures excellent system stability and responsiveness, even at high rotation speeds or with frequent directional changes, which is crucial for high-precision optical alignment.

[0009] Preferably, the lower surface of the X-axis rotating member is provided with an X-axis lower fixed groove, the upper surface of the Z-axis rotating member is provided with an X-axis upper fixed groove, and the X-axis ball is partially fitted with the X-axis lower fixed groove and partially fitted with the X-axis upper fixed groove.

[0010] The X-axis lower fixing groove on the lower surface of the X-axis rotating component and the X-axis upper fixing groove on the upper surface of the Z-axis rotating component form a tight and flexible coupling relationship. By fine-tuning the groove depth and ball size, the friction coefficient can be effectively controlled, ensuring sufficient friction to maintain structural integrity while avoiding heat accumulation and material wear caused by excessive friction.

[0011] Preferably, the two Z-axis balls and the Z-axis roller are distributed in a triangle, the midpoint of the line connecting the two Z-axis balls and the Z-axis roller are arranged along the Z-axis direction, the axis of the Z-axis roller is perpendicular to the Z-axis direction, the Z-axis rotating part is located above the Z-axis balls and the Z-axis roller, and the base is located below the X-axis balls and the Z-axis roller.

[0012] Preferably, a Z-axis lower fixed groove is provided on the lower surface of the Z-axis rotating part, and a Z-axis upper fixed groove is provided on the upper surface of the base, and the Z-axis ball is partially fitted with the Z-axis lower fixed groove and partially fitted with the Z-axis upper fixed groove; a roller groove is provided on the upper surface of the base, and the Z-axis roller is provided in the roller groove.

[0013] When the Z-axis ball bearings are partially and tightly coupled with the Z-axis lower retaining groove of the Z-axis rotating member and the Z-axis upper retaining groove of the base, they form a highly efficient force transmission network. While bearing the weight, the balls effectively reduce the contact area, significantly lowering the coefficient of friction. Simultaneously, the Z-axis rollers, arranged perpendicular to the Z-axis, provide a rigid lateral support surface with their unique configuration, ensuring that the entire structure does not experience unnecessary distortion or displacement when subjected to axial loads.

[0014] Preferably, the X-axis magnet is disposed in the area in front of the X-axis rotating member along the Z-axis direction, and the X-axis coil is disposed next to the X-axis magnet. There are two Z-axis magnets, one disposed on the side wall in front of the Z-axis rotating member along the Y-axis direction and the other on the side wall in the rear of the Z-axis direction, and the Z-axis coil is disposed next to the Z-axis magnet.

[0015] For Z-axis control, two Z-axis magnets are placed on either side of the Z-axis rotating part. The two magnets are symmetrically distributed along the Y-axis on the front and rear side walls of the Z-axis rotating part, forming a powerful torque adjustment system and providing a solid foundation for complex three-dimensional adjustment operations.

[0016] Preferably, the spring is a leaf spring substantially parallel to the plane defined by the X-axis and the Z-axis, and is located behind the X-axis rotating member and the Z-axis rotating member in the X-axis direction and in front of the base in the X-axis direction.

[0017] Specially designed leaf springs play an essential role in ensuring the stability of the prism drive structure. These springs are positioned approximately parallel to the plane defined by the X and Z axes, simplifying assembly and significantly reducing costs.

[0018] A lens driving device includes the hybrid prism driving structure described above, a housing fixedly connected to the base, and an autofocus module arranged at the rear side of the hybrid prism driving device in the Z-axis direction.

[0019] A camera comprises the lens driving device as described above.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The key to the hybrid prism drive structure of this utility model lies in its combined ball and roller support mechanism. These balls and rollers not only support the rotating element but also serve as its axis of rotation, allowing it to rotate around them. Ball bearings, due to their rolling rather than sliding nature, exhibit extremely low friction when carrying radial loads, significantly reducing wear between moving parts. Rollers, on the other hand, excel at carrying larger axial loads and also offer the advantage of a low coefficient of friction. This combination minimizes the frictional effects of the X- and Z-axis rotating elements during angular adjustment, ensuring smooth system operation and positioning accuracy. In addition to reducing friction, this design also enhances the stability of the entire drive structure. Because both the balls and rollers can roll freely within their respective operating ranges, they effectively disperse stress concentrations caused by external impacts or internal imbalances, preventing excessive stress at a single point. This maintains the overall rigidity and geometric shape of the structure even under frequent dynamic operation, preventing loosening or deformation after prolonged operation. The close fit between the ball and the roller, and the grease layer applied to the ball surface, can further reduce the wear rate and ensure smooth operation for long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is an exploded view of a hybrid prism driving structure according to an embodiment of the present invention.

[0024] Figure 2 This is an exploded view from another perspective of the hybrid prism driving structure of one embodiment of the present invention.

[0025] Figure 3 This is a structural diagram of the X-axis rotating component and the Z-axis rotating component in one embodiment of the present invention.

[0026] Figure 4 This is a structural diagram of the X-axis rotating component in one embodiment of the present utility model.

[0027] Figure 5This is a structural diagram of the X-axis rotating component from another perspective of an embodiment of the present invention.

[0028] Figure 6 This is a structural diagram of the Z-axis rotating component in one embodiment of the present invention. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0031] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. In the description of the embodiments of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use, or is the orientation or position relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0032] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0033] The technical solution in this application will be described below with reference to the accompanying drawings.

[0034] This embodiment provides a lens driving device, including a hybrid prism driving structure 100, a housing 200 fixedly connected to a base 130, and an autofocus module 300 disposed on the rear side of the hybrid prism driving device in the Z-axis direction. The hybrid prism driving structure 100 is used to support and drive a prism 400. The prism can adjust the light incident along the X-axis direction to be transmitted along the Z-axis direction. The Y-axis direction, the Z-axis direction, and the X-axis direction are perpendicular to each other. The incident light of the prism is incident from the front in the X-axis direction. The hybrid prism driving structure 100 includes an X-axis rotating member 110 for supporting the prism, a Z-axis rotating member 120 supporting the X-axis rotating member 110, a base 130 supporting the Z-axis rotating member 120, and a connecting member 110 and the Z-axis rotating member 120. and a spring 140 of the base 130, an X-axis magnet 150 and an X-axis coil 160 for driving the X-axis rotating member 110 to rotate relative to the base 130 around the Y-axis direction, and a Z-axis magnet 170 and a Z-axis coil 180 for driving the Z-axis rotating member 120 to rotate relative to the base 130 around the Z-axis direction; the base 130 movably supports the Z-axis rotating member 120 through two Z-axis balls 510 and a Z-axis roller 520, and the Z-axis rotating member 120 movably supports the X-axis rotating member 110 through two X-axis balls 530.

[0035] The key to the design lies in the combined support mechanism of balls and rollers. These not only support the rotating components but also serve as their axis of rotation, allowing them to rotate around them. Ball bearings, due to their rolling rather than sliding nature, exhibit extremely low friction when carrying radial loads, significantly reducing wear between moving parts. Rollers, on the other hand, excel at carrying larger axial loads and also offer the advantage of a low coefficient of friction. This combination minimizes frictional effects during angular adjustment of the X-axis rotating component 110 and the Z-axis rotating component 120, ensuring smooth operation and positioning accuracy. In addition to reducing friction, this design also enhances the stability of the entire drive structure. Because both the balls and rollers can roll freely within their respective operating ranges, they effectively disperse stress concentrations caused by external impacts or internal imbalances, preventing excessive stress at a single point. This maintains the overall rigidity and geometric shape of the structure even under frequent dynamic operation, preventing loosening or deformation over time. The close fit between the ball and the roller, and the grease layer applied to the ball surface, can further reduce the wear rate and ensure smooth operation for long-term use.

[0036] In this embodiment, two X-axis balls 530 are disposed along the Y-axis direction. The X-axis rotating component 110 is located above the X-axis balls 530 , and the Z-axis rotating component 120 is located below the X-axis balls 530 .

[0037] Two X-axis ball bearings 530 precisely aligned along the Y-axis provide a stable support platform and achieve a precise mechanical balance between the X-axis rotating component 110 and the Z-axis rotating component 120. This layout ensures that the system maintains excellent stability and responsiveness even under high-speed rotation or frequent directional changes, which is crucial for high-precision optical alignment.

[0038] In this embodiment, an X-axis lower fixed groove 531 is provided on the lower surface of the X-axis rotating member 110, and an X-axis upper fixed groove 532 is provided on the upper surface of the Z-axis rotating member 120. The X-axis ball 530 is partially in contact with the X-axis lower fixed groove 531 and partially in contact with the X-axis upper fixed groove 532.

[0039] The X-axis lower fixed groove 531 on the lower surface of the X-axis rotating member 110 and the X-axis upper fixed groove 532 on the upper surface of the Z-axis rotating member 120 form a tight and flexible coupling relationship. By finely adjusting the groove depth and ball size, the friction coefficient can be effectively controlled, ensuring sufficient friction to maintain structural integrity while avoiding heat accumulation and material wear caused by excessive friction.

[0040] In this embodiment, the two Z-axis balls 510 and the Z-axis roller 520 are distributed in a triangle, the midpoint of the line connecting the two Z-axis balls 510 and the Z-axis roller 520 are set along the Z-axis direction, the axis of the Z-axis roller 520 is perpendicular to the Z-axis direction, the Z-axis rotating part 120 is above the Z-axis ball 510 and the Z-axis roller 520, and the base 130 is below the X-axis ball 530 and the Z-axis roller 520.

[0041] In this embodiment, a Z-axis lower fixed groove 511 is provided on the lower surface of the Z-axis rotating part 120, and a Z-axis upper fixed groove 512 is provided on the upper surface of the base 130. The Z-axis ball 510 is partially in contact with the Z-axis lower fixed groove 511 and partially in contact with the Z-axis upper fixed groove 512. A roller groove 521 is provided on the upper surface of the base 130, and the Z-axis roller 520 is provided in the roller groove 521.

[0042] While bearing weight, the balls also effectively reduce the contact area, significantly lowering the coefficient of friction. Meanwhile, the Z-axis rollers 520, arranged perpendicular to the Z-axis, provide a solid lateral support surface with their unique shape, ensuring that the entire structure does not experience unnecessary distortion or displacement when bearing axial loads.

[0043] In this embodiment, X-axis magnet 150 is disposed in the Z-axis forward region of X-axis rotating member 110, and X-axis coil 160 is disposed adjacent to X-axis magnet 150. Two Z-axis magnets 170 are disposed on the Z-axis forward and rearward sidewalls of Z-axis rotating member 120, respectively, along the Y-axis. Z-axis coil 180 is disposed adjacent to Z-axis magnet 170.

[0044] For Z-axis control, two Z-axis magnets 170 are placed on both sides of the Z-axis rotating part 120. The two magnets are symmetrically distributed on the front and rear side walls of the Z-axis rotating part 120 along the Y-axis direction, forming a powerful torque adjustment system, which provides a solid foundation for complex three-dimensional adjustment operations.

[0045] In this embodiment, the spring 140 is a leaf spring 140 substantially parallel to the plane defined by the X-axis and the Z-axis, and is located behind the X-axis rotating member 110 and the Z-axis rotating member 120 in the X-axis direction and in front of the base 130 in the X-axis direction.

[0046] The specially designed leaf spring 140 plays an indispensable role in ensuring the stability of the prism drive structure 100. This spring 140 is placed substantially parallel to the plane defined by the X-axis and the Z-axis, making it easy to assemble and significantly reducing assembly costs.

[0047] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hybrid prism drive structure for supporting and driving a prism, wherein the prism can adjust light incident along the X-axis direction to be transmitted along the Z-axis direction, wherein the Y-axis direction, the Z-axis direction, and the X-axis direction are mutually perpendicular, and the incident light of the prism is incident from the front in the X-axis direction, characterized in that: The hybrid prism driving structure includes an X-axis rotating part for supporting the prism, a Z-axis rotating part supporting the X-axis rotating part, a base supporting the Z-axis rotating part, a spring connecting the X-axis rotating part, the Z-axis rotating part and the base, an X-axis magnet and an X-axis coil for driving the X-axis rotating part to rotate around the Y-axis direction relative to the base, and a Z-axis magnet and a Z-axis coil for driving the Z-axis rotating part to rotate around the Z-axis direction relative to the base; the base movably supports the Z-axis rotating part through two Z-axis balls and a Z-axis roller, and the Z-axis rotating part movably supports the X-axis rotating part through two X-axis balls.

2. The hybrid prism driving structure according to claim 1, characterized in that: The two X-axis balls are arranged along the Y-axis direction, the X-axis rotating component is located above the X-axis balls, and the Z-axis rotating component is located below the X-axis balls.

3. The hybrid prism driving structure according to claim 1, wherein: The lower surface of the X-axis rotating part is provided with an X-axis lower fixed groove, and the upper surface of the Z-axis rotating part is provided with an X-axis upper fixed groove. The X-axis ball is partially fitted with the X-axis lower fixed groove and partially fitted with the X-axis upper fixed groove.

4. The hybrid prism driving structure according to claim 1, wherein: The two Z-axis balls and the Z-axis roller are distributed in a triangle, the midpoint of the line connecting the two Z-axis balls and the Z-axis roller are arranged along the Z-axis direction, the axis of the Z-axis roller is perpendicular to the Z-axis direction, the Z-axis rotating part is located above the Z-axis balls and the Z-axis roller, and the base is located below the X-axis balls and the Z-axis roller.

5. The hybrid prism driving structure according to claim 1, wherein: The lower surface of the Z-axis rotating part is provided with a Z-axis lower fixed groove, and the upper surface of the base is provided with a Z-axis upper fixed groove. The Z-axis ball is partially fitted with the Z-axis lower fixed groove and partially fitted with the Z-axis upper fixed groove; the upper surface of the base is provided with a roller groove, and the Z-axis roller is provided in the roller groove.

6. The hybrid prism driving structure according to claim 1, wherein: The X-axis magnet is arranged in a region in front of the X-axis rotating member along the Z-axis direction, and the X-axis coil is arranged beside the X-axis magnet.

7. The hybrid prism driving structure according to claim 1, wherein: There are two Z-axis magnets, which are respectively arranged on the side wall in front of the Z-axis rotating part along the Y-axis direction and the side wall in the rear of the Z-axis rotating part along the Y-axis direction. The Z-axis coil is arranged beside the Z-axis magnets.

8. The hybrid prism driving structure according to claim 1, wherein: The spring is a leaf spring substantially parallel to the plane defined by the X-axis and the Z-axis, and is located behind the X-axis rotating member and the Z-axis rotating member in the X-axis direction and in front of the base in the X-axis direction.

9. A lens driving device, characterized in that: It comprises the hybrid prism driving structure as described in any one of claims 1-8, and also comprises a shell fixedly connected to the base and an autofocus module arranged on the rear side of the hybrid prism driving device in the Z-axis direction.

10. A camera, characterized in that: It includes the lens driving device as claimed in claim 9.

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