Prism driving mechanism and camera module

Abstract

The utility model relates to a prism driving mechanism and a camera module, comprising a base, a movable frame which is driven by a first driving assembly to rotate around an incident optical axis relative to the base, and a lens carrier which is driven by a second driving assembly to rotate around a first direction axis perpendicular to the incident optical axis relative to the movable frame, a fixed-point rotating ball and a moving ball are arranged between the base and the moving frame, the moving ball takes the fixed-point rotating ball as a rotating center to enable the moving frame to do arc-shaped track motion relative to a plane perpendicular to the incident optical axis, the projection of the fixed-point rotating ball and the projection of the first direction shaft on the plane are distributed in a staggered mode, and the fixed-point rotating ball is composed of a shaft and / or a ball. The mechanism has the advantages that the fixed-point rotating ball and the moving ball are utilized, in the installation process of the mechanism, the posture difference does not need to be corrected tediously, meanwhile, it is ensured that the movable frame does precise track motion on the plane relatively perpendicular to the incident optical axis, and therefore the stability and precision of the system are improved, and the imaging quality is improved.

Description

Technical Field

[0001] The present application belongs to the field of electronic equipment camera, and in particular to a prism drive mechanism and a camera module. Background Art

[0002] Optical image stabilization in mobile photography is a technology for a stabilizing platform that aims to reduce the impact of camera shake and vibration on image stability. When taking photos with a mobile phone, the image may be blurry or distorted due to factors such as hand shaking and object movement. This is when the optical image stabilization technology can play an important role.

[0003] The existing prism motor has a single-carrier structure: the nodding and shaking heads use the same ball bearing, and the nodding driving magnet is at the bottom. The single-carrier structure has a crosstalk problem when nodding and shaking heads. Utility Model Content

[0004] The purpose of the utility model is to provide a prism driving mechanism and a camera module that can solve the above technical problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The prism driving mechanism comprises a base, a moving frame driven by a first driving assembly to rotate relative to the base around an incident light axis, and a ball group, used to make the moving frame rotate around the incident light axis; and the ball group is distributed on a plane perpendicular to the incident light axis;

[0007] The movable frame is connected to a lens carrier via shafts and / or balls distributed along a first direction axis perpendicular to both the incident optical axis and the exit optical axis, and the lens carrier is driven to rotate around the first direction axis via a second driving assembly;

[0008] The movable frame or the lens carrier has a stabilizing portion that is magnetically attracted to the shaft and / or the ball.

[0009] Furthermore, the shaft or ball is fixed to the moving frame, and the lens carrier has a matching position that matches the shaft or ball.

[0010] Furthermore, the stabilizing part is provided on the matching position or the carrier, and the magnetic attraction direction of the shaft and / or the ball and the stabilizing part is along the direction of the incident light axis.

[0011] Furthermore, the ball group comprises a fixed-point rotating ball and two moving balls moving on concentric spherical surfaces with the fixed-point rotating ball as the center, and the fixed-point rotating ball and the two moving balls are distributed in a triangle.

[0012] As another alternative, the fixed-point rotating ball includes a protrusion with an arc-shaped convex surface, and a fixed-point rotating groove for at least part of the protrusion to abut against, and the arc-shaped convex surface and the fixed-point rotating groove are in tangential movable contact;

[0013] The protrusion or the fixed-point rotating groove is arranged on the base, and the other is arranged on the moving frame.

[0014] Furthermore, the fixed-point rotating groove has a plurality of conical surfaces in it, and the arc-shaped convex surface is in tangential movable contact with the conical surfaces.

[0015] Furthermore, the movable frame is provided with an implant having at least a portion extending into the fixed-point rotation groove, and the fixed-point rotation groove is provided on the implant.

[0016] Furthermore, the implant is an angled plate, at least part of the implant extends to the bottom surface of the movable frame parallel to the plane, and the remaining part of the implant extends to the side surface of the movable frame perpendicular to the plane.

[0017] Furthermore, the first driving component includes at least one group of first driving magnets fixed to the side of the moving frame, and a first driving coil fixed to the base and spaced apart from the first driving magnets, and at least a portion of the first driving magnets contacts the implant.

[0018] Furthermore, the implant is made of metal or magnetic material, the second driving component is an electromagnetic coil driving component, and at least a portion of the second driving component is fixed to the base, and the remaining portion of the second driving component is fixed to the lens carrier.

[0019] The present application also provides a camera module, which includes the prism driving mechanism.

[0020] Compared with the existing technology, the advantages of the present application are: by utilizing fixed-point rotating balls and moving balls, there is no need to tediously correct posture differences during the installation process, while ensuring that the moving frame performs precise trajectory motion on a plane relatively perpendicular to the incident light axis, thereby improving the stability and accuracy of the system and facilitating improving imaging quality.

[0021] By distributing the shaft and / or the ball bearings on the first direction axis and combining with magnetic attraction, the position accuracy of the lens carrier can be ensured and motion crosstalk can be prevented.

[0022] Through the design of the ball group, the structure of the ball can be used as a string limiter in the axial direction. The structure of the shaft is responsible for rotation. At the same time, the larger contact area of ​​the shaft can improve reliability and reduce the risk of impact and chipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an exploded detail diagram of the main components of the prism drive mechanism of the utility model from the left front perspective;

[0024] Figure 2 It is an exploded detail diagram of the main components of the prism drive mechanism of the utility model from the right front perspective;

[0025] Figure 3 It is an exploded detail diagram of the main components of the prism drive mechanism of the utility model from the right rear perspective;

[0026] Figure 4 This is a schematic diagram of the assembly of the prism drive mechanism of the utility model;

[0027] Figure 5 This is a schematic diagram of the bottom component of the movable frame of the utility model;

[0028] Figure 6 This is a schematic diagram of the main internal components of the base of the utility model;

[0029] Figure 7 is a schematic longitudinal section diagram of the prism driving mechanism in the first embodiment;

[0030] Figure 8 is a schematic longitudinal section diagram of the prism driving mechanism in the second embodiment;

[0031] Fig. 9 This is a schematic diagram of an electronic device in the fourth embodiment.

[0032] In the figure, base 1, protrusion 10, arc-shaped convex surface 100, fixed-point rotating groove 11, conical surface 110, shaft 12, moving frame 2, implant 20, lens carrier 3, matching position 30, first driving component 4, first driving magnet 40, first driving coil 41, second driving component 5, ball group Z6, moving ball 6, moving sphere 60, incident light axis Z, first direction axis Y, fixed-point rotating ball Z1, plane xY. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] Embodiment 1

[0035] like Figure 1-Figure 3 As shown, the prism driving mechanism includes a base 1, a moving frame 2 driven by a first driving component 4 to rotate relative to the base 1 around an incident light axis Z, and the moving frame 2 is connected to a lens carrier 3 via an axis 12 and / or a ball distributed along a first direction axis Y perpendicular to the incident light axis Z;

[0036] The first method: a shaft 12 and a ball; the structure of the ball can be used as a limiter in the axial direction, and the structure of the shaft is responsible for rotation. At the same time, the larger contact area of ​​the shaft can improve reliability and reduce the risk of impact and chipping.

[0037] The second method: two coaxial shafts 12.

[0038] The moving frame 2 or the lens carrier 3 has a stabilizing portion (not shown in the figure) that is magnetically attracted to the shaft 12 and / or the ball. The stabilizing portion is magnetically attracted to the shaft 12 and / or the ball to ensure the movement stability of the lens carrier 3. The stabilizing portion has a contoured surface that is contoured to the outer peripheral surface of the shaft 12 or at least a portion of the arc-shaped convex surface of the ball to improve the stability of the magnetic attraction.

[0039] The following is a specific implementation plan:

[0040] In the first specific solution, a shaft 12 is fixed to the moving frame 2, a ball is fixed to the moving frame 2, and a matching position 30 matching the shaft 12 and the ball is provided on the lens carrier 3. The matching position 30 is shaped like the structure of the shaft 12 and the ball, and a stabilizing part is provided on the matching position 30. Either the stabilizing part or the shaft is made of metal, and the other is made of magnetic material. Of course, both can be selected as magnetic materials. The material selection of the ball and the stabilizing part is as mentioned above.

[0041] In a second specific solution, two shafts 12 are fixed to the movable frame 2 , and a matching position 30 matching with the shafts 12 is provided on the lens carrier 3 .

[0042] And the lens carrier 3 is driven to rotate relative to the movable frame 2 around the first direction axis Y perpendicular to the incident optical axis Z by the second driving component 5, and the lens carrier 3 is driven to rotate the first direction axis Y by the second driving component 5. A ball group Z6 for rotating the movable frame 2 around the incident optical axis Z is provided between the base 1 and the movable frame 2, and the ball group Z6 moves on the plane xY perpendicular to the incident optical axis Z. The ball group Z6 has a fixed-point rotating ball Z1 and two moving balls 6 moving on concentric spherical surfaces with the fixed-point rotating ball Z1 as the center. The fixed-point rotating ball Z1 and the moving ball 6 with the fixed-point rotating ball Z1 as the rotation center make the movable frame 2 move in an arc trajectory relative to the plane xY perpendicular to the incident optical axis Z. The fixed-point rotating ball Z1 and the projection of the first direction axis Y on the plane xY are staggered, and the fixed-point rotating ball Z1 is composed of balls.

[0043] The first drive assembly 4 and the second drive assembly 5 respectively control the rotational movement of the moving frame 2 and the lens carrier 3, so that the prism drive mechanism has flexibility and controllability in multiple directions, which can meet complex focusing and control requirements. The design is provided with a fixed-point rotating ball Z1 and a moving ball 6, which can ensure that the moving frame 2 moves in a precise trajectory on a plane xY that is relatively perpendicular to the incident optical axis Z, thereby improving the stability and accuracy of the system, which is beneficial to improving the imaging quality. Through the design of the staggered distribution of the fixed-point rotating ball Z1 and the first direction axis Y on the plane xY, the balanced movement of the moving frame 2 and the lens carrier 3 can be achieved, the imbalance of the system can be reduced, and it is beneficial to extend the life of the equipment and improve the stability. This design compactly mounts the drive assembly and the rotating mechanism on the base 1, which helps to save space, simplify the structure, and facilitate maintenance and adjustment.

[0044] like Figure 6 As shown, there are two groups of moving balls 6 and they are distributed in a triangle with the fixed-point rotating balls Z1.

[0045] By arranging the moving balls 6 into two groups and distributing them in a triangular shape, the stability of the moving frame 2 when performing arc trajectory motion on the plane xY can be improved. This distribution method can effectively balance the movement of the moving frame and prevent unstable movement or deformation caused by concentrated load.

[0046] like Figure 5 As shown, the fixed-point rotating ball Z1 is installed on the base 1, and the movable frame 2 has a fixed-point rotating groove 11 for at least part of the fixed-point rotating ball Z1 to extend into, and the fixed-point rotating groove 11 has a plurality of conical surfaces 110, and the arc convex surface 100 is in tangential and movable contact with the conical surfaces 110.

[0047] When the arc-shaped convex surface 100 of the fixed-point rotating ball Z1 is in tangential contact with the conical surface 110, the limiting and rotation functions can be realized. That is, when subjected to external force or torsion, the system will automatically adjust according to the force conditions to maintain a good contact state, which can reduce wear, extend the service life of components, and enhance the durability and stability of the system.

[0048] An implant 20 at least partially extending into the fixed-point rotation slot 11 is disposed on the movable frame 2 , and the fixed-point rotation slot 11 is disposed on the implant 20 .

[0049] The implant 20 is an angled plate, at least part of the implant 20 extends to the bottom surface of the movable frame 2 parallel to the plane xY, and the remaining part of the implant 20 extends to the side surface of the movable frame 2 perpendicular to the plane xY.

[0050] The design structure of the implant 20 can provide strength. A portion extending parallel to the bottom surface improves the support strength in the horizontal direction, and another portion extending perpendicular to the side surface provides support strength in the vertical direction.

[0051] The implant 20 is made of metal or magnetic material, and the first drive component 4 includes at least one group of first drive magnets 40 fixed to the side of the moving frame 2, and a first drive coil 41 fixed to the base 1 and separated from the first drive magnet 40, and at least part of the first drive magnet 40 contacts the implant 20.

[0052] By making implant 20 of metal or magnetic material, it can better interact with magnetic fields and can more effectively concentrate or transmit magnetic fields.

[0053] The moving ball 6 includes a moving spherical body 60 , and the moving spherical body 60 is in tangential movable contact with the base 1 and / or the moving frame 2 .

[0054] By adopting a design in which the moving ball 60 is tangent to the base 1 and / or the moving frame 2, relatively smooth moving contact can be achieved, reducing friction and wear, and helping to maintain smooth movement of the system.

[0055] The second driving assembly 5 is an electromagnetic coil driving assembly, and at least a portion of the second driving assembly 5 is fixed to the base 1 , and the remaining portion of the second driving assembly 5 is fixed to the lens carrier 3 .

[0056] The first driving assembly 4 and the second driving assembly 5 share a circuit board.

[0057] The electromagnetic coil drive assembly can control the magnetic field strength and direction by adjusting the current to achieve precise control of the lens carrier 3. The design of partially fixing it to the base 1 can increase the stability of the second drive assembly 5 and reduce its shaking and deformation during operation.

[0058] Embodiment 2

[0059] The structure and principle of this embodiment are basically the same as those of the first embodiment, with the difference being that the fixed-point rotating ball Z1 is replaced by a protrusion 10 having an arc-shaped convex surface 100, and a fixed-point rotating groove 11 for at least part of the protrusion 10 to be inserted into, and the arc-shaped convex surface 100 and the fixed-point rotating groove 11 are in tangential movable contact; the protrusion 10 is either a hemisphere or a cylinder having an arc-shaped convex surface 100.

[0060] The protrusion 10 or the fixed-point rotation groove 11 is disposed on the base 1 , and the other is disposed on the movable frame 2 .

[0061] like Figure 7As shown, through the tangential active contact between the arc-shaped convex surface 100 and the fixed-point rotating groove 11, more stable and reliable support and guidance can be provided, ensuring the smooth movement of the fixed-point rotating ball Z1, which is beneficial to reducing the vibration and instability of the system. The design of the protrusion 10 and the fixed-point rotating groove 11 can effectively guide and limit the movement direction of the fixed-point rotating ball Z1, reduce unnecessary deviations and drifts, and make the movement of the system more accurate and controllable. The design of the protrusion 10 and the fixed-point rotating groove 11 on the base 1 and the moving frame 2 makes the fixed-point rotating ball Z1 more compact, which is beneficial to saving space, simplifying the system structure, and facilitating installation and maintenance.

[0062] Embodiment 3

[0063] The structure and principle of this embodiment are basically the same as those of the first embodiment, and the difference lies in that, in view of the structure of the fixed-point rotating ball of the first embodiment, this embodiment provides a new fixed-point rotating ball.

[0064] like Figure 8 As shown, in this embodiment, the fixed-point rotating ball Z1 is composed of an axis, the fixed-point rotating ball Z1 is completely fixed to the base 1, and the axial direction is perpendicular to the plane xY. The fixed-point rotating ball Z1 is partially inserted into the bottom of the moving frame 2 and is rotationally connected to the moving frame 2.

[0065] This structure can effectively reduce the shaking and deviation of the fixed-point rotating ball Z1 during operation, improve working accuracy and stability, and at the same time, users can easily disassemble and replace the fixed-point rotating ball Z1, reduce maintenance costs and time, and improve equipment reliability and continuous operation time.

[0066] Embodiment 4

[0067] The structure and principle of this embodiment are basically the same as those of the first embodiment, and the difference lies in that, in contrast to the prism driving mechanism of the first embodiment, the lens driving device of this embodiment includes a prism driving mechanism.

[0068] A lens drive is a device used to adjust the position or focal length of a lens, usually by mechanical, electrical or other means. The main function of a lens drive is to adjust the position of the lens to achieve control of the focal length, focus or focusing of the optical system.

[0069] Embodiment 5

[0070] The structure and principle of this embodiment are basically the same as those of the fourth embodiment, and the different structure is that, with respect to the lens driving device of the above-mentioned third embodiment, the camera module of this embodiment includes a lens driving device.

[0071] like Fig. 9As shown in the figure, the camera module includes a lens driving device. The camera module refers to a modular component that integrates a camera, a lens, a sensor and other related components. The camera module usually includes components such as an image sensor, an image processor, a lens, an optical filter, a focal length adjuster, an autofocus module, etc., and can be directly used in various devices and applications, such as smartphones, tablets, surveillance cameras, car cameras, etc.

[0072] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A prism driving mechanism, comprising a base (1), and a moving frame (2) driven to rotate relative to the base (1) by a first driving component (4), characterized in that: The movable frame (2) is connected to a lens carrier (3) via shafts (12) and / or balls distributed along a first direction axis (Y) perpendicular to both the incident light axis (Z) and the exit light axis (X), and the lens carrier (3) is driven to rotate around the first direction axis (Y) via a second driving component (5); The movable frame (2) or the lens carrier (3) has a stabilizing portion that is magnetically attracted to the shaft (12) and / or the ball bearing.

2. The prism drive mechanism according to claim 1, characterized in that: The shaft (12) or the ball bearing is fixed to the movable frame (2), and the lens carrier (3) has a matching position (30) that matches the shaft (12) or the ball bearing.

3. The prism drive mechanism according to claim 2, characterized in that: The matching position (30) or the carrier (3) is provided with the stabilizing portion, and the magnetic attraction direction of the shaft (12) and / or the ball and the stabilizing portion is along the direction of the incident light axis (Z).

4. The prism drive mechanism according to claim 1, characterized in that: The prism driving mechanism further comprises a ball group (Z6) for causing the moving frame (2) to rotate around the incident light axis (Z); and the ball group (Z6) is distributed on a plane (xY) perpendicular to the incident light axis (Z); The ball group (Z6) comprises a fixed-point rotating ball (Z1) and two moving balls (6) moving on concentric spherical surfaces with the fixed-point rotating ball (Z1) as the center; the fixed-point rotating ball (Z1) and the two moving balls (6) are distributed in a triangular shape.

5. The prism driving mechanism according to claim 4, characterized in that: The fixed-point rotating ball (Z1) is mounted on the base (1), and the movable frame (2) has a fixed-point rotating groove (11) for at least part of the fixed-point rotating ball (Z1) to extend into, and the fixed-point rotating groove (11) has at least three conical surfaces (110) that are in tangential and movable contact with the fixed-point rotating ball (Z1).

6. The prism drive mechanism according to claim 5, characterized in that: The movable frame (2) is provided with an implant (20) having at least a portion extending into the fixed-point rotation groove (11); the fixed-point rotation groove (11) is provided on the implant (20).

7. The prism drive mechanism according to claim 6, characterized in that: The implant (20) is an angled plate, at least part of the implant (20) extends to the bottom surface of the movable frame (2) parallel to the plane (xY), and the remaining part of the implant (20) extends to the side surface of the movable frame (2) perpendicular to the plane (xY).

8. The prism drive mechanism according to claim 6 or 7, characterized in that: The first driving component (4) comprises at least one group of first driving magnets (40) fixed to the side of the moving frame (2), and a first driving coil (41) fixed to the base (1) and spaced apart from the first driving magnets (40), wherein at least a portion of the first driving magnets (40) contacts the implant (20).

9. The prism drive mechanism according to claim 6 or 7, characterized in that: The implant (20) is made of metal or magnetic material, the second drive component (5) is an electromagnetic coil drive component, and at least a portion of the second drive component (5) is fixed to the base (1) and has a magnetic attraction effect with the implant (20), and the remaining portion of the second drive component (5) is fixed to the lens carrier (3).

10. A camera module, characterized in that: The prism driving mechanism comprises the prism driving mechanism as described in any one of claims 1 to 9.

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