A camera module with anti-shake

Abstract

This application discloses a camera stabilization module, comprising: a fixed structure including at least two separate outer ball bearing seats, each outer ball bearing seat having a rotation fulcrum, and the total number of rotation fulcrums being at least four; a first circuit board having a fixed part, an elastic part, and a connecting part connected in sequence, the fixed part being connected to the fixed structure; a plurality of balls, the same number as the number of rotation fulcrums, rotatably connected to each rotation fulcrum; a movable structure disposed within the outer ball bearing seats, the bottom of the movable structure being connected to the connecting part, the movable structure including an inner ball bearing seat and a lens mounted on the inner ball bearing seat, the outer periphery of the inner ball bearing seat having at least four spherical segments corresponding to each ball bearing, the centers of each spherical segment coinciding with the rotation center, the balls abutting against the spherical segments; and a driving structure capable of driving the movable structure to rotate around at least two rotation axes. The camera stabilization module of this application has minimal impact of attitude differences on stabilization performance, low assembly difficulty, and is easy to mass-produce.

Description

Technical Field

[0001] This application relates to an image stabilization camera module. Background Technology

[0002] In recent years, small mobile devices with shooting capabilities have become very popular, and their applications are constantly expanding, including aerial photography, action cameras, and dashcams. These mobile devices with shooting capabilities all include camera modules; therefore, the market for camera modules is huge.

[0003] When taking photos or videos using the aforementioned mobile device, the photos or videos may be blurry and the image quality may be affected by external vibration factors. In cases of strong vibration or low light conditions, the adverse effects will be exacerbated.

[0004] To address these issues, some small-scale image stabilization technologies have emerged on the market; among them, mechanical image stabilization methods are more effective at compensating for external vibrations. Specifically, mechanical image stabilization achieves its effect by using image stabilization actuators to translate and / or rotate the lens and image sensor.

[0005] In existing technologies, ball bearing-type image stabilization camera modules (reference document CN111664324A) can achieve multi-axis rotational freedom, and due to their high displacement spring coefficient, the impact of different attitude differences and changes in the direction of gravity on image stabilization performance is relatively low, making them widely used. However, as described in CN111664324A, the outer and inner mounting bodies are rotatably connected by a set of ball bearings, with two of the ball bearings located above the center of rotation and the other two located below it. When assembling the outer mounting body and the rotating structure, interference inevitably occurs. This is especially true when the angle between the tangential surface of the inner mounting body that contacts the ball bearings and the optical axis of the lens is large, which increases assembly difficulty and makes mass production impossible. Summary of the Invention

[0006] One objective of this application is to provide a camera stabilization module that not only provides multi-axis degrees of freedom and reduces the impact of attitude differences on stabilization performance, but also effectively reduces assembly difficulty and facilitates mass production.

[0007] The objective of this application is achieved through the following technical solution:

[0008] A camera stabilization module, comprising:

[0009] A fixed structure includes at least two separate outer ball bearing seats, which are connected and jointly define a through opening. Each outer ball bearing seat has a rotation fulcrum, and the total number of rotation fulcrums is at least four, located within the through opening.

[0010] A first circuit board, the first circuit board having a fixing part, an elastic part and a connecting part connected in sequence, the fixing part being connected to the fixing structure;

[0011] A connecting structure, the connecting structure including a plurality of balls in the same number as the number of the rotation fulcrum, the plurality of balls being rotatably connected to each of the rotation fulcrums in a one-to-one correspondence;

[0012] A movable structure, which passes through the opening, has its bottom connected to the connecting part. The movable structure includes an inner ball bearing seat and a lens mounted on the inner ball bearing seat. The outer periphery of the inner ball bearing seat has at least four spherical segments corresponding to each ball bearing, with the centers of all spherical segments coinciding with the rotation center. The balls abut against the spherical segments.

[0013] A drive structure capable of driving the movable structure to rotate about at least two rotation axes.

[0014] In some embodiments of this application, the fixing structure includes two outer ball bearing seats stacked vertically, each outer ball bearing seat having an opening extending vertically, the two openings communicating to form the through-hole, and each outer ball bearing seat having at least two rotation fulcrums.

[0015] The plane passing through the rotation center and perpendicular to the optical axis of the lens is defined as the first reference plane. The rotation fulcrum on the upper outer ball bearing seat is located above the first reference plane, and the rotation fulcrum on the lower outer ball bearing seat is located below the first reference plane.

[0016] In some embodiments of this application, the diameter of each spherical segment is the same, each outer ball bearing seat is provided with two rotation fulcrums, and the angle between the tangent at the contact position of each spherical segment with the ball and the optical axis of the lens is equal.

[0017] Viewed from above, the two pivot points and the center of rotation on the upper outer ball bearing seat are all located on the first reference line, and the two pivot points and the center of rotation on the lower outer ball bearing seat are all located on the second reference line.

[0018] The first reference line is perpendicular to the second reference line.

[0019] In some embodiments of this application, each of the external ball bearing seats includes:

[0020] The base, wherein the opening is formed on the base; and

[0021] At least two clamping parts are provided, the clamping parts are connected to the opening of the base, the clamping parts are provided with grooves, the ball is disposed in the grooves, and the rotation fulcrum is limited to the inner wall surface of the grooves;

[0022] The two bases are stacked one on top of the other.

[0023] In some embodiments of this application, at least one clamping part is configured as follows:

[0024] A flexible arm is suspended in the opening, with one end of the flexible arm connected to the base and the other end connected to the clamping part, and the relationship is satisfied: L≥4t; where L is the length of the flexible arm and t is the thickness of the flexible arm.

[0025] In some embodiments of this application, at least one of the outer ball bearing seats is provided with a limiting member, and the outer periphery of the inner ball bearing seat is provided with a notch. The limiting member cooperates with the notch to limit the rotation angle of the movable structure relative to the fixed structure.

[0026] In some embodiments of this application, the drive structure includes at least two sets of actuators, which are circumferentially spaced along the outer periphery of the inner ball bearing seat.

[0027] The actuator includes a coil and a magnet arranged opposite to each other, the coil and the magnet being respectively disposed on the inner peripheral wall of the opening and the outer peripheral wall of the inner ball bearing seat.

[0028] In some embodiments of this application, the magnet is disposed on the inner peripheral wall of the opening, and the coil is disposed on the outer peripheral wall of the inner ball bearing seat.

[0029] In some embodiments of this application, in each group of actuators, the magnet completely covers the coil, and the outer edge of the magnet protrudes beyond the outer edge of the coil.

[0030] In some embodiments of this application, at least one of the actuators further includes a metal sheet disposed on the outer peripheral wall of the inner ball bearing seat, and the metal sheet is disposed on the outer periphery and / or inner periphery of the coil.

[0031] In some embodiments of this application, the movable structure further includes:

[0032] The second circuit board is connected to the bottom of the lens, and the bottom surface of the second circuit board is mechanically and electrically connected to the connecting part. An image sensor is provided on the top surface of the second circuit board.

[0033] In some embodiments of this application, the lens includes:

[0034] Lens mount, the lens mount being connected to the inner periphery of the inner ball bearing seat; and

[0035] An optical unit is disposed on the inner periphery of the lens mount, and the image sensor is disposed opposite to the optical unit.

[0036] In some embodiments of this application, the movable structure further includes:

[0037] A third circuit board is mounted on the outer periphery of the inner ball bearing seat and is electrically connected to the second circuit board. The third circuit board is provided with a position sensor and / or an inertial measurement unit.

[0038] In some embodiments of this application, the third circuit board includes:

[0039] A frame, the frame overlapping the top surface of the inner ball bearing seat; and

[0040] Multiple extension arms are circumferentially spaced around the outer periphery of the inner ball bearing seat. The upper end of each extension arm is connected to the frame. The position sensor is provided on the outer side of each extension arm.

[0041] In some embodiments of this application, the outer peripheral wall of the inner ball bearing seat is provided with a plurality of slots that are one-to-one with each of the extension arms. The top of the slots extends through the top surface of the inner ball bearing seat, and the extension arms are accommodated in the slots.

[0042] In some embodiments of this application, the third circuit board further includes:

[0043] The lower extension plate is staggered from each of the extension arms in the circumferential direction. The lower extension plate includes a side plate and an end plate connected in sequence. The top side of the side plate is connected to the frame, and one side of the end plate is connected to the bottom side of the side plate and extends radially along the lens. The side plate is fitted to the outer peripheral wall of the inner ball bearing seat, and the end plate is fitted to the bottom surface of the second circuit board. The inertial measurement unit is provided on the outer side of the side plate.

[0044] In some embodiments of this application, the fixing structure further includes:

[0045] The housing has a mounting cavity inside, and the top of the housing has a through-hole communicating with the mounting cavity. The at least two outer ball bearing seats and the first circuit board are mounted in the mounting cavity of the housing, and the top of the lens passes through the through-hole.

[0046] In some embodiments of this application, the housing includes:

[0047] Lower casing; and

[0048] An upper housing, the upper housing covering the top of the upper housing, and the mounting cavity defined between the upper housing and the lower housing;

[0049] The fixing part is sandwiched between the upper shell and the lower shell.

[0050] In some embodiments of this application, the fixing portion extends outside the housing, and a connector is provided in the area of ​​the fixing portion extending outside the housing.

[0051] In some embodiments of this application, the elastic portion includes:

[0052] At least two elastic wires, each elastic wire being located on the second reference plane, one end of each elastic wire being connected to the fixing part, and the other end of each elastic wire being connected to the connecting part, each elastic wire comprising at least two connecting segments that are bent and connected in sequence.

[0053] The second reference plane is perpendicular to the optical axis of the lens.

[0054] In some embodiments of this application, the at least two spaced elastic wires are symmetrically distributed on both sides of the connecting portion;

[0055] The second reference plane is perpendicular to the optical axis of the lens.

[0056] In some embodiments of this application, the outer side of the housing has an opening that communicates with the mounting cavity; the elastic portion includes:

[0057] An elastic plate, one end of which is connected to the fixing part, and the other end of which is connected to the connecting part, the elastic plate includes a first plate body and a second plate body connected in sequence, the plate surface of the first plate body is parallel to the optical axis of the lens, the plate surface of the second plate body is perpendicular to the optical axis, one side of the first plate body is connected to the fixing part, the other side of the first plate body is connected to one side of the second plate body, the other side of the second plate body is connected to the connecting part, and the second plate body is disposed within the passage.

[0058] In some embodiments of this application, the first plate includes two walls connected in sequence, and the two walls are perpendicular to each other. In some embodiments of this application,

[0059] The image stabilization camera module of this application has a fixed structure and a movable structure that are rotatably connected by a first circuit board including an elastic part and at least four ball bearings. Under the action of the driving structure, the movable structure can rotate in multiple axes relative to the fixed structure, and the impact of different attitude differences on the image stabilization performance is low. In addition, the fixed structure of this application is provided with at least two separate outer ball bearing seats, and each outer ball bearing seat has a rotation fulcrum for connecting the ball bearings. During assembly, each outer ball bearing seat is first installed on the outer periphery of the movable structure in sequence through the ball bearings, and then assembled with other components, thereby effectively reducing the assembly difficulty and realizing mass production of the product. Attached Figure Description

[0060] The present application will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are intended only to conceptually represent the composition or structure of the described objects and may contain exaggerated representations, and the drawings are not necessarily drawn to scale.

[0061] Figure 1 This is a schematic diagram of the structure of a camera stabilization module according to some embodiments of this application;

[0062] Figure 2 yes Figure 1 An explosion diagram;

[0063] Figure 3 This is a top view of a camera stabilization module according to some embodiments of this application;

[0064] Figure 4 yes Figure 3 Sectional view along axis AA;

[0065] Figure 5 yes Figure 3 BB-direction sectional view;

[0066] Figure 6 yes Figure 3 CC-direction sectional view;

[0067] Figure 7 yes Figure 3 DD section view;

[0068] Figure 8 yes Figure 1 A schematic diagram of the explosion between the ball bearing holder and the magnet in China and abroad;

[0069] Figure 9 yes Figure 1 An exploded view of the area between the inner ball bearing seat, the third circuit board, and the coil;

[0070] Figure 10 yes Figure 1 A schematic diagram of the structure of the first circuit board in the diagram;

[0071] Figure 11 This is an exploded view of a camera stabilization module according to some embodiments of this application;

[0072] Figure 12 This is an assembly diagram of the outer ball bearing seat and the inner ball bearing seat in a camera module with image stabilization according to some embodiments of this application;

[0073] Figure 13 This is an assembly diagram of the outer ball bearing seat and the inner ball bearing seat in a camera stabilization module of some embodiments of this application;

[0074] Figure 14 This is a schematic diagram of the structure of a camera stabilization module according to some embodiments of this application;

[0075] Figure 15 yes Figure 14 A schematic diagram of the structure of the first circuit board in the diagram;

[0076] In the picture,

[0077] 100. Fixed structure; 110. Outer ball bearing seat; 111. Rotation fulcrum; 112. Base; 1121. Opening; 113. Clamping part; 1131. Groove; 114. Elastic arm; 115. Limiting element; 120. Through port; 130. Outer shell; 131. Mounting cavity; 132. Through opening; 133. Lower shell; 134. Upper shell; 135. Through port;

[0078] 200, First circuit board; 210, Fixing part; 211, Connector; 220, Elastic part; 221, Elastic wire; 2211, Connecting section; 222, Elastic plate; 2221, First plate body; 2221a, Wall surface; 2222, Second plate body; 230, Connecting part;

[0079] 300. Connecting structure; 310. Ball bearings;

[0080] 400. Drive structure; 410. Actuator; 411. Coil; 412. Magnet; 413. Metal sheet;

[0081] 500. Movable structure; 510. Inner ball bearing seat; 511. Spherical section; 512. Notch; 513. Slot; 520. Lens; 521. Lens mount; 522. Optical unit; 530. Second circuit board; 531. Image sensor; 540. Third circuit board; 541. Position sensor; 542. Inertial measurement unit; 543. Frame; 544. Extension arm; 545. Lower extension plate; 5451. Side plate; 5452. End plate;

[0082] X, first reference line; Y, second reference line; Z, optical axis of the lens; a, reference sphere. Detailed Implementation

[0083] Preferred embodiments of this application will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary, and should not be construed as limiting the scope of protection of this application.

[0084] First, it should be noted that the directions such as top, bottom, upward, and downward mentioned in this article are defined relative to the directions in the various accompanying figures. They are relative concepts and therefore can change depending on their different positions and practical applications. Therefore, these or other directions should not be interpreted as restrictive terms.

[0085] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude the plural.

[0086] Furthermore, it should be noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the accompanying drawings, can still be combined among these technical features (or their equivalents) to obtain other embodiments of this application not directly mentioned herein.

[0087] It should also be understood that while the terms "first," "second," etc., are used in this document to describe various types of information, this information should not be limited to these terms, which are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0088] It should be noted that in different figures, the same reference numerals denote the same or substantially the same components.

[0089] like Figures 1-15 As shown in the figure, this application embodiment proposes an image stabilization camera module, which includes: a fixed structure 100, a first circuit board 200, a connecting structure 300, a movable structure 500, and a driving structure 400.

[0090] The fixing structure 100 includes two outer ball bearing seats 110. These two outer ball bearing seats 110 are not integrally formed; rather, they are separate units that can be disassembled. The two outer ball bearing seats 110 are stacked vertically and connected. Each outer ball bearing seat 110 has a through-hole 1121, which connects to form a through-portion 120. Each outer ball bearing seat 110 has two rotational fulcrums 111, for a total of four rotational fulcrums 111, all located within the through-portion 120. The first circuit board 200 has a fixing part 210, an elastic part 220, and a connecting part 230 connected sequentially. The fixing part 210 is connected to the fixing structure 100. The connecting structure 30... The movable structure 500 includes four balls 310 that are rotatably connected to each of the rotation fulcrums 111. The movable structure 500 is inserted into the opening 120. The bottom of the movable structure 500 is connected to the connecting part 230. The movable structure 500 includes an inner ball seat 510 and a lens 520 mounted on the inner ball seat 510. At least four spherical segments 511 corresponding to each ball 310 are provided on the outer periphery of the inner ball seat 510. The center of each spherical segment 511 coincides with the rotation center, which passes through the optical axis Z of the lens 520. The balls 310 abut against the spherical segments 511. The driving structure 400 can drive the movable structure 500 to rotate around at least two rotation axes, each rotation axis passing through or approximately passing through the rotation center.

[0091] Based on the above structure, during operation, when external vibrations occur, the drive structure 400 drives the movable structure 500 to rotate relative to the fixed structure 100. When this rotation is opposite in direction to the external vibration and has the same amplitude, it can cancel out the external vibration, thus achieving anti-vibration. Four balls 310 are arranged between the two outer ball bearing seats 110 and the inner ball bearing seat 510. Each of the four balls 310 abuts against one of the four concentric spherical segments 511 on the inner ball bearing seat 510, enabling multi-axis rotation anti-vibration (specifically, the direction of the rotation axis is determined by the direction of the driving force applied by the drive structure 400 to the movable structure 500). Furthermore, the four balls 310 can abut against the movable structure 500. To achieve stable and reliable support and reduce the impact of attitude differences on anti-shake performance, the first circuit board 200 is an elastic circuit board that connects the bottom of the movable structure 500 and the fixed structure 100. It can achieve a damping effect during anti-shake movement and can achieve automatic springback and reset of the movable structure 500 after anti-shake is completed. In addition, since it includes two separate outer ball bearing seats 110, each of which has two rotation fulcrums 111 that are rotatably connected to the ball bearing 310, during assembly, the two outer ball bearing seats 110 can be connected to the outer periphery of the inner ball bearing seat 510 through the ball bearing 310 in a top-to-bottom or bottom-to-top manner. The assembly is simple and facilitates mass production of the product.

[0092] In some embodiments of this application, the above-mentioned through-hole 120 may be configured to pass through horizontally or in other inclined forms according to actual needs, and no limitation is made in this application.

[0093] In some preferred embodiments of this application, see the appendix. Figures 2-5 As shown, in order to further facilitate the assembly of each outer ball bearing seat 110 and inner ball bearing seat 510, and to provide stable support for the movable structure 500, so that the movable structure 500 is less affected by attitude difference when realizing multi-axis image stabilization rotation, the plane passing through the rotation center and perpendicular to the optical axis Z of the lens 520 is defined as the first reference plane. The rotation fulcrum 111 on the upper outer ball bearing seat 110 is all located above the first reference plane, and the rotation fulcrum 111 on the lower outer ball bearing seat 110 is all located below the first reference plane.

[0094] More preferably, specifically as follows Figure 4 and Figure 5 As shown, the diameters of all spherical segments 511 are set to be equal, meaning that all spherical segments 511 are located on the same reference spherical surface a; the angle β (not specifically marked in the attached figure) between the tangent surface at the contact point with the ball 310 on each spherical segment 511 and the optical axis Z of the lens 520 is equal, such as... Figure 5 As shown; Figure 3 As shown, viewed from above, the two pivot points 111 and the center of rotation on the upper outer ball bearing seat 110 are both located on the first reference line X, while the two pivot points 111 and the center of rotation on the lower outer ball bearing seat 110 are both located on the second reference line Y; wherein, the first reference line X and the second reference line Y are perpendicular. Based on this structure, when β is large, the assembly difficulty can be effectively reduced, and a stable multi-axis anti-shake effect can be achieved.

[0095] It should be noted that in some embodiments of this application, the diameters of each spherical segment 511 can also be set to be unequal, that is, as long as the centers of each spherical segment 511 coincide.

[0096] like Figure 8 As shown, after the two outer ball bearing seats 110 are stacked one on top of the other, the whole structure is rectangular, and the four balls 310 are respectively located at the four corners of the rectangle.

[0097] Please refer to the appendix for further details. Figure 4 , 5 As shown in Figure 8, in some embodiments of this application, each outer ball bearing seat 110 includes: a base 112 and two clamping portions 113, an opening 1121 is formed on the base 112, the clamping portions 113 are connected to the opening 1121 of the base 112, and each clamping portion 113 is provided with a rotation fulcrum 111; and the two bases 112 are stacked vertically, and the ball bearing 310 is disposed between each clamping portion 113 and the inner ball bearing seat 510.

[0098] In addition, such as Figure 4-8 As shown, in some embodiments, in order to ensure the stability of rotational anti-shake, the clamping part 113 is provided with a groove 1131, the ball 310 is disposed in the groove 1131, and the rotation fulcrum 111 is limited to the inner wall surface of the groove 1131.

[0099] In some embodiments of this application, to further reduce assembly difficulty, at least one clamping portion 113 of the two outer ball bearing seats 110 is configured to be suspended within the opening 1121 by an elastic arm 114, one end of the elastic arm 114 being connected to the base 112, and the other end of the elastic arm 114 being connected to the clamping portion 113, such as... Figure 5 As shown, the elastic arm 114 is disposed on the first reference plane and extends radially along the reference sphere a. The elastic arm 114 satisfies the relationship: L≥4t; where L is the extension length of the elastic arm 114 and t is the thickness of the elastic arm 114. The elastic arm 114 that satisfies the above relationship has a low radial elastic coefficient, which makes the influence of part tolerance and assembly tolerance on the normal force and friction force applied to the ball 310 lower. This can reduce part machining tolerance and assembly tolerance, thereby reducing production difficulty, reducing production cost, and improving production yield.

[0100] See appendix Figure 12 , 13 As shown, in some embodiments of this application, at least one outer ball bearing seat 110 is provided with a limiting member 115, and the outer periphery of the inner ball bearing seat 510 is provided with a notch 512. The limiting member 115 cooperates with the notch 512 to limit the rotation angle of the movable structure 500 relative to the fixed structure 100. By providing a limiting member 115 on the outer ball bearing seat 110, it can mechanically limit the movement of the movable parts with the notch 512 on the inner ball bearing seat 510, thus preventing excessive rotation of the moving parts during anti-shake movement or drops, which would affect the reliability of the product. (The attached text is incomplete and requires further context.) Figure 12 The diagram shows an embodiment where only one of the outer ball bearing seats 110 has a limiting member 115, while the attached... Figure 13 The figure shows a specific embodiment in which limiting members 115 are provided on two outer ball bearing seats 110 respectively.

[0101] For example, in some embodiments of this application, the drive structure 400 includes at least two sets of actuators 410, which are circumferentially spaced along the outer periphery of the inner ball bearing seat 510. The actuator 410 includes a coil 411 and a magnet 412 disposed opposite to each other. The coil 411 and the magnet 412 are respectively disposed on the inner peripheral wall of the opening 120 and the outer peripheral wall of the inner ball bearing seat 510 (specifically including two arrangement forms, the first of which is to place the coil 411 on the inner peripheral wall of the opening 120 and the magnet 412 on the outer peripheral wall of the inner ball bearing seat 510; the other is to place the coil 411 on the outer peripheral wall of the inner ball bearing seat 510 and the magnet 412 on the inner peripheral wall of the opening 120).

[0102] During anti-shake movement, by changing the current in coil 411, the electromagnetic force applied to movable structure 500 can be changed, thereby causing movable structure 500 to rotate. When the rotation is opposite to the direction of external vibration and the amplitude is close, effective anti-shake is achieved.

[0103] Specifically, each group of actuators 410 can control the movable structure 500 to rotate around a rotation axis to prevent shaking, and the specific direction of the rotation axis is related to the arrangement of the coils 411; the number of groups of actuators 410 is selected and set according to the specific required degrees of freedom of rotation to prevent shaking.

[0104] like Figure 1-10 In the illustrated embodiment, two sets of actuators 410 are provided, meaning the movable structure 500 has two rotational degrees of freedom; as Figure 11 In the embodiment shown, three sets of actuators 410 are provided, and the movable structure 500 has three-axis rotational degrees of freedom.

[0105] In some preferred embodiments of this application, the magnet 412 is disposed on the inner peripheral wall of the opening 120, while the coil 411 is disposed on the outer peripheral wall of the inner ball bearing seat 510. In each set of actuators 410, the magnet 412 completely covers the coil 411, and the outer edge of the magnet 412 protrudes beyond the outer edge of the coil 411. Specifically, as shown... Figure 6 and Figure 7 As shown, the upper and lower ends of magnet 412 extend beyond the upper and lower sides of coil 411, respectively. During image stabilization, coil 411 can operate in areas with stronger magnetic fields, making more efficient use of assembly space and increasing magnetic force. This results in a more compact overall product structure, improved stabilization angle, and reduced power consumption. Furthermore, fixing magnet 412 to the fixed structure 100 effectively reduces magnetic interference from nearby magnets on the image stabilization camera module, thus avoiding any impact on stabilization performance.

[0106] like Figure 11As shown in some embodiments of this application, each of the three actuators 410 further includes a metal sheet 413. The metal sheet 413 is disposed on the outer peripheral wall of the inner ball bearing seat 510, and the coil 411 is located between the metal sheet 413 and the magnet 412. During anti-shake movement, the metal sheet 413 rotates relative to the magnet 412, thereby generating a back electromotive force and an electromagnetic force opposite to the anti-shake movement, which can effectively increase the damping effect in the control system and improve the high-frequency anti-shake effect. In addition, when the electronic system fails due to lack of power, the damping effect still exists, which can effectively reduce unnecessary movement and noise of the movable structure 500 caused by external vibration when power is off.

[0107] In some embodiments of this application, the metal sheet 413 in the above embodiments can be disposed on the outer peripheral wall of the inner ball bearing seat 510 at the position of the outer peripheral of the coil 411, that is, the actuator 410 includes the coil 411, the metal sheet 413, and the magnet 412 arranged in sequence from the inside to the outside.

[0108] Similarly, metal sheets 413 can be provided on the inner and outer sides of each coil 411.

[0109] In some embodiments of this application, the metal sheet 413 may be provided only in a portion of the actuator 410, and the above-mentioned effect can be achieved.

[0110] In addition, it should be noted that in some embodiments of this application, other actuation devices may be provided in the movable structure 500 to drive the lens 520 to move along the optical axis to achieve the autofocus function. For example, a shape memory alloy motor may be used to drive the lens 520.

[0111] Please refer to the appendix for further details. Figures 1-11 As shown, the movable structure 500 also includes: a second circuit board 530; the second circuit board 530 is connected to the bottom of the lens 520, and the bottom surface of the second circuit board 530 is mechanically and electrically connected to the connecting part 230; an image sensor 531 is provided on the top surface of the second circuit board 530; the first circuit board 200 can be electrically connected to other external control boards (e.g., the motherboard in a small mobile device with shooting function), so that the external control board can communicate with the image sensor 531 through the first circuit board 200 and obtain image information.

[0112] In some embodiments of this application, the lens 520 includes a lens mount 521 and an optical unit 522. The lens mount 521 is connected to the inner periphery of the inner ball bearing seat 510, and the optical unit 522 passes through the inner periphery of the lens mount 521, that is, the optical unit 522 is connected to the inner ball bearing seat 510 through the lens mount 521. The image sensor 531 is disposed opposite to the optical unit 522.

[0113] Furthermore, in some embodiments of this application, the movable structure 500 further includes: a third circuit board 540, which is mounted on the outer periphery of the inner ball bearing seat 510 and electrically connected to the second circuit board 530. The third circuit board 540 is provided with a position sensor 541 and / or an inertial measurement unit 542. By reading the information on the position sensor 541, closed-loop anti-shake control can be realized to achieve better anti-shake effect. Specifically, the position information on the position sensor 541 is obtained to control the current on / off and magnitude of each coil 411. In addition, by reading the data on the inertial measurement unit 542 that moves together with the image sensor 531, electronic anti-shake can be added to achieve better anti-shake effect.

[0114] Specifically, such as Figure 11 As shown in some embodiments of this application, in order to simplify the structure and make the product more compact, the third circuit board 540 includes: a frame 543, a lower extension plate 545, and a plurality of extension arms 544; the frame 543 overlaps the top surface of the inner ball bearing seat 510, and the plurality of extension arms 544 are circumferentially spaced around the outer periphery of the inner ball bearing seat 510. The upper end of the extension arm 544 is connected to the frame 543, and a position sensor 541 is provided on the outer side of each extension arm 544. The lower extension plate 545 is connected to each extension arm 544. 44 are staggered in the circumferential direction. The lower extension plate 545 includes a side plate 5451 and an end plate 5452 connected in sequence. The top side of the side plate 5451 is connected to the frame 543. One side of the end plate 5452 is connected to the bottom side of the side plate 5451 and extends inward along the radial direction of the lens 520. The side plate 5451 is attached to the outer peripheral wall of the inner ball seat 510. The end plate 5452 is attached to the bottom surface of the second circuit board 530. An inertial measurement unit 542 is provided on the outer side of the side plate 5451.

[0115] For example, in some embodiments of this application, each coil 411 is arranged in a ring around the outer periphery of the position sensor 541, that is, the position sensor 541 is located in the middle of the coil 411.

[0116] Furthermore, in order to ensure a more compact structure, in some embodiments, the outer peripheral wall of the inner ball bearing seat 510 is provided with a plurality of slots 513 that are one-to-one with each extension arm 544. The top of the slot 513 extends through the top surface of the inner ball bearing seat 510, and the extension arm 544 is accommodated in the slot 513.

[0117] In some embodiments of this application, the fixing structure 100 further includes: a housing 130, which has a mounting cavity 131 inside. The top of the housing 130 has a through-hole 132 communicating with the mounting cavity 131. At least two outer ball bearing seats 110 and the first circuit board 200 are installed in the mounting cavity 131 of the housing 130, and the top of the lens 520 passes through the through-hole 132. The housing 130 can effectively protect the components located in its mounting cavity 131.

[0118] In addition, for ease of assembly, the outer casing 130 includes two casings: a lower casing 133 and an upper casing 134. The upper casing 134 covers the top of the lower casing 133, and the mounting cavity 131 is defined between the upper casing 134 and the lower casing 133. The fixing part 210 is partially sandwiched between the upper casing 134 and the lower casing 133. In specific assembly, the moving parts are first assembled into a whole, then the outer ball bearing seats 110 are sequentially assembled onto the outer periphery of the inner ball bearing seat 510 via the balls 310, then the first circuit board 200 is connected to the second circuit board 530, and finally the upper casing 134 and the lower casing 133 are closed to complete the assembly.

[0119] For example, the upper housing 134 and the lower housing 133 are connected by adhesive or welding.

[0120] In addition, in order to facilitate the connection of external circuit parts, in some embodiments of this application, the fixing part 210 extends out of the outer shell 130, and the area of ​​the fixing part 210 extending out of the outer shell 130 is provided with a connector 211.

[0121] like Figure 10 As shown in some embodiments of this application, the elastic part 220 includes at least two elastic wires 221, both of which are disposed within the mounting cavity 131. Each elastic wire 221 is located on the same second reference plane. One end of each elastic wire 221 is connected to the fixing part 210, and the other end is connected to the connecting part 230. Each elastic wire 221 includes at least two sequentially bent connecting segments 2211. By placing at least two elastic wires 221 on the same second reference plane, better damping and rebound effects can be achieved.

[0122] Further reading is available in the appendix. Figure 10 As shown, in some preferred embodiments of this application, at least two spaced elastic wires 221 are symmetrically distributed on both sides of the connecting portion 230 on the elastic portion 220; wherein, the second reference plane is perpendicular to the optical axis Z of the lens 520.

[0123] In other embodiments, such as Figure 14 and Figure 15As shown, an opening 135 is defined between the upper housing 134 and the lower housing 133. The opening 135 is located on the outside of the outer housing 130 and communicates with the mounting cavity 131. The elastic part 220 includes an elastic plate 222, one end of which is connected to the fixing part 210, and the other end of which is connected to the connecting part 230. The elastic plate 222 includes a first plate body 2221 and a second plate body 2222 connected in sequence. The surface of the first plate body 2221 is parallel to the optical axis Z of the lens 520, and the surface of the second plate body 2222 is perpendicular to the optical axis Z. One side of the first plate body 2221 is connected to the fixing part 210, and the other side of the first plate body 2221 is connected to one side of the second plate body 2222. The other side of the second plate body 2222 is connected to the connecting part 230, and the second plate body 2222 is disposed within the opening 135. This product has a simpler structure, higher space utilization, and can effectively reduce the overall product volume while still ensuring good damping and rebound effects.

[0124] Further reading can be found in the appendix. Figure 15 As shown, in order to achieve better damping and rebound effects, in some embodiments of this application, the first plate 2221 includes two walls 2221a connected in sequence, and the two walls 2221a are perpendicular.

[0125] Additionally, it should be noted that in this embodiment, a certain amount of space needs to be left between the connecting part 230 and the bottom surface of the lower housing 133 to ensure that the connecting part 230 can rotate relative to the fixed part 210.

[0126] In some embodiments of this application, the outer shell 130 may be configured in other forms, such as: an integral structure, two or more shells stacked vertically, two or more shells that are left and right overlapping, etc., which are not limited in this application.

[0127] In some preferred embodiments of this application, more than four balls 310 may be provided between the movable structure 500 and the fixed structure 100, that is, three or more balls 310 are connected on at least one outer ball bearing seat 110. However, in this application, a minimum of four balls 310 is sufficient, which not only achieves a stable connection between the movable structure 500 and the fixed structure 100, but also simplifies the structure.

[0128] Additionally, it should be noted that the image stabilization camera module in some embodiments of this application can be assembled using at least two (two or more) separate outer ball bearing seats 110 through other assembly methods (not specifically shown in the accompanying drawings). For example: each outer ball bearing seat 110 has a bayonet on one side, and each ball bearing seat 310 is connected end-to-end, with each bayonet connecting to form the aforementioned through-hole 120. During assembly, the movable structure 500 is rotatably connected to each outer ball bearing seat 110 via the balls 310 by sequentially connecting each outer ball bearing seat 110 circumferentially.

[0129] In summary, in the image stabilization camera module of this application embodiment, the fixed structure 100 and the movable structure 500 are rotatably connected by a first circuit board 200 including an elastic part 220 and at least four balls 310. Under the action of the drive structure 400, the movable structure 500 can rotate relative to the fixed structure 100 in multiple axes, and the impact of different attitude differences on image stabilization performance is low. In addition, the fixed structure 100 in this application is provided with at least two separate outer ball bearing seats 110, and each outer ball bearing seat 110 has a rotation fulcrum 111 connecting the balls 310. During assembly, each outer ball bearing seat 110 is first installed on the outer periphery of the movable structure 500 through the balls 310, and then assembled with other components, thereby effectively reducing the assembly difficulty and realizing mass production of the product.

[0130] This specification discloses the present application with reference to the accompanying drawings and also enables those skilled in the art to implement the application, including making and using any device or system, employing suitable materials, and using any combination of methods. The scope of this application is defined by the claimed technical solution and includes other instances that would occur to those skilled in the art. Such other instances shall be considered to fall within the scope of protection defined by the claimed technical solution, provided that they include structural elements that are not different from the literal language of the claimed technical solution, or contain equivalent structural elements that are not substantially different from the literal language of the claimed technical solution.

Claims

1. A camera stabilization module, characterized in that, include: A fixed structure includes at least two separate outer ball bearing seats, which are connected and jointly define a through opening. Each outer ball bearing seat has a rotation fulcrum, and the total number of rotation fulcrums is at least four, located within the through opening. A first circuit board, the first circuit board having a fixing part, an elastic part and a connecting part connected in sequence, the fixing part being connected to the fixing structure; A connecting structure, the connecting structure including a plurality of balls in the same number as the number of the rotation fulcrum, the plurality of balls being rotatably connected to each of the rotation fulcrums in a one-to-one correspondence; A movable structure is provided inside the opening. The bottom of the movable structure is connected to the connecting part. The movable structure includes an inner ball seat and a lens mounted on the inner ball seat. At least four spherical segments corresponding to each ball are provided on the outer periphery of the inner ball seat. The center of each spherical segment coincides with the rotation center. The ball abuts against the spherical segment. as well as A drive structure capable of driving the movable structure to rotate about at least two rotation axes.

2. The image stabilization camera module according to claim 1, characterized in that, The fixing structure includes two outer ball bearing seats stacked vertically, each outer ball bearing seat having an opening extending vertically, the two openings connecting to form the through-hole, and each outer ball bearing seat having at least two rotation fulcrums. The plane passing through the rotation center and perpendicular to the optical axis of the lens is defined as the first reference plane. The rotation fulcrum on the upper outer ball bearing seat is located above the first reference plane, and the rotation fulcrum on the lower outer ball bearing seat is located below the first reference plane.

3. The image stabilization camera module according to claim 2, characterized in that, The diameter of each spherical segment is the same, and each outer ball bearing seat is provided with two rotation fulcrums. The angle between the tangent at the contact position of each spherical segment with the ball bearing and the optical axis of the lens is equal. Viewed from above, the two pivot points and the center of rotation on the upper outer ball bearing seat are all located on the first reference line, and the two pivot points and the center of rotation on the lower outer ball bearing seat are all located on the second reference line. The first reference line is perpendicular to the second reference line.

4. The image stabilization camera module according to claim 2, characterized in that, Each of the aforementioned external ball bearing seats includes: The base, wherein the opening is formed on the base; and At least two clamping parts are provided, the clamping parts are connected to the opening of the base, the clamping parts are provided with grooves, the ball is disposed in the grooves, and the rotation fulcrum is limited to the inner wall surface of the grooves; The two bases are stacked one on top of the other.

5. The image stabilization camera module according to claim 4, characterized in that, At least one clamping part is configured as follows: A flexible arm is suspended in the opening, with one end of the flexible arm connected to the base and the other end connected to the clamping part, and the relationship is satisfied: L≥4t; where L is the length of the flexible arm and t is the thickness of the flexible arm.

6. The image stabilization camera module according to claim 1, characterized in that, At least one of the outer ball bearing seats is provided with a limiting member, and the outer periphery of the inner ball bearing seat is provided with a notch. The limiting member cooperates with the notch to limit the rotation angle of the movable structure relative to the fixed structure.

7. The image stabilization camera module according to any one of claims 1-6, characterized in that, The drive structure includes at least two sets of actuators, which are circumferentially spaced along the outer periphery of the inner ball bearing seat. The actuator includes a coil and a magnet arranged opposite to each other, the coil and the magnet being respectively disposed on the inner peripheral wall of the opening and the outer peripheral wall of the inner ball bearing seat.

8. The image stabilization camera module according to claim 7, characterized in that, The magnet is disposed on the inner peripheral wall of the opening, and the coil is disposed on the outer peripheral wall of the inner ball bearing seat.

9. The image stabilization camera module according to claim 8, characterized in that, In each group of actuators, the magnet completely covers the coil, and the outer edge of the magnet protrudes beyond the outer edge of the coil.

10. The image stabilization camera module according to claim 8, characterized in that, At least one of the actuators further includes a metal sheet disposed on the outer peripheral wall of the inner ball bearing seat, and the metal sheet is disposed on the outer periphery and / or inner periphery of the coil.

11. The image stabilization camera module according to any one of claims 1-6, characterized in that, The movable structure also includes: The second circuit board is connected to the bottom of the lens, and the bottom surface of the second circuit board is mechanically and electrically connected to the connecting part. An image sensor is provided on the top surface of the second circuit board.

12. The image stabilization camera module according to claim 11, characterized in that, The lens includes: Lens mount, the lens mount being connected to the inner periphery of the inner ball bearing seat; and An optical unit is disposed on the inner periphery of the lens mount, and the image sensor is disposed opposite to the optical unit.

13. The image stabilization camera module according to claim 11, characterized in that, The movable structure also includes: A third circuit board is mounted on the outer periphery of the inner ball bearing seat and is electrically connected to the second circuit board. The third circuit board is provided with a position sensor and / or an inertial measurement unit.

14. The image stabilization camera module according to claim 13, characterized in that, The third circuit board includes: A frame, the frame overlapping the top surface of the inner ball bearing seat; and Multiple extension arms are circumferentially spaced around the outer periphery of the inner ball bearing seat. The upper end of each extension arm is connected to the frame. The position sensor is provided on the outer side of each extension arm.

15. The image stabilization camera module according to claim 14, characterized in that, The outer peripheral wall of the inner ball bearing seat is provided with a plurality of slots that are one-to-one with each of the extension arms. The top of the slots extends through the top surface of the inner ball bearing seat, and the extension arms are accommodated in the slots.

16. The image stabilization camera module according to claim 14, characterized in that, The third circuit board also includes: The lower extension plate is staggered from each of the extension arms in the circumferential direction. The lower extension plate includes a side plate and an end plate connected in sequence. The top side of the side plate is connected to the frame, and one side of the end plate is connected to the bottom side of the side plate and extends radially along the lens. The side plate is fitted to the outer peripheral wall of the inner ball bearing seat, and the end plate is fitted to the bottom surface of the second circuit board. The inertial measurement unit is provided on the outer side of the side plate.

17. The image stabilization camera module according to any one of claims 1-6, characterized in that, The fixing structure also includes: The housing has a mounting cavity inside, and the top of the housing has a through-hole communicating with the mounting cavity. The at least two outer ball bearing seats and the first circuit board are mounted in the mounting cavity of the housing, and the top of the lens passes through the through-hole.

18. The image stabilization camera module according to any one of claims 1-6, characterized in that, The elastic portion includes: At least two elastic wires, each elastic wire being located on the second reference plane, one end of each elastic wire being connected to the fixing part, and the other end of each elastic wire being connected to the connecting part, each elastic wire comprising at least two connecting segments that are bent and connected in sequence.

19. The image stabilization camera module according to claim 18, characterized in that, The at least two spaced elastic wires are symmetrically distributed on both sides of the connecting portion; The second reference plane is perpendicular to the optical axis of the lens.

20. The image stabilization camera module according to claim 17, characterized in that, The outer side of the outer casing is provided with an opening, which communicates with the mounting cavity; the elastic part includes: An elastic plate, one end of which is connected to the fixing part, and the other end of which is connected to the connecting part, the elastic plate includes a first plate body and a second plate body connected in sequence, the plate surface of the first plate body is parallel to the optical axis of the lens, the plate surface of the second plate body is perpendicular to the optical axis, one side of the first plate body is connected to the fixing part, the other side of the first plate body is connected to one side of the second plate body, the other side of the second plate body is connected to the connecting part, and the second plate body is disposed within the passage.

21. The image stabilization camera module according to claim 20, characterized in that, The first plate includes two walls connected in sequence, and the two walls are perpendicular to each other.

Images