Optical anti-vibration system

Abstract

The invention relates to an optical anti-shake system (10) for a camera module (1a). The optical anti-shake system (10) includes: (i) a moving part (100) including an image sensor (110); (ii) a fixed part (200) including the moving part (100) therein and including a front opening (210) to expose the image sensor (110) of the moving part (100) to the outside wherein the moving part (100) is disposed in the fixed part (200) such that the moving part (100) is displaceable relative to the fixed part (200); (iii) an actuator (300) for displacing the moving part (100) relative to the fixed part (200) to achieve optical stabilization; (iv) a pair of signal transmission members (400) for transmitting a signal from the image sensor (110) of the moving part (100) to a respective signal receiving terminal (220) fixed in position with respect to the fixed part (200), where each signal transmission member (400) comprises a first end (410) and a second end (420), the first end (410) of each signal transmission member (400) is electrically connected to the image sensor (110) of the moving part (100), and the second end (420) of each signal transmission member (400) is electrically connected to the corresponding signal receiving terminal (220). Each signal transmission member (400) is configured as a leaf spring. Each signal transmission component (400) further comprises a connecting arm part (430), and the first end (410) and the second end (420) of each signal transmission component (400) are connected into a whole through the connecting arm part (430). The connecting arm portion (430) of each signal transmission member (400) extends along a non-linear path starting at the first end (410), at least partially surrounding the first end (410), and terminating at the second end (420). The invention further relates to a product (1) comprising the camera module (1a), and the camera module (1a) comprises the optical anti-vibration system (10).

Description

Technical Field

[0001] The present invention relates to an optical image stabilization system. In particular, the present invention relates to a three-axis sensor shift optical image stabilization system for a camera module or a camera unit of various products, wherein the various products are various terminal devices, including mobile electronic devices such as smart phones and mobile phones. The present invention also relates to a product including such an optical image stabilization system. Background Art

[0002] In recent years, in order to achieve higher anti-shake performance in camera modules installed in mobile devices such as smartphones and mobile phones, sensor-shift optical image stabilization (hereinafter also referred to as "OIS") systems have attracted much attention. The OIS system is designed to enhance the ability to take pictures, which has become one of the main functions of smartphones or mobile phones.

[0003] In the sensor-shift OIS system, the imager needs to be moved. However, since the imager has about 40 signals, when trying to extract these signals to the outside via a flexible printed card (FPC), the width and / or thickness of the FPC becomes quite large. Therefore, the reaction force generated when driving the imager becomes too large.

[0004] To solve this problem, the length of the FPC needs to be increased to make it easier to bend. However, the increase in the length of the FPC in turn increases the overall size of the camera module. This trend is particularly evident in the configuration of actuators that can achieve optical image stabilization in three-axis directions (X, Y, and roll directions). This poses a major challenge to camera modules for mobile devices.

[0005] For example, US 11,223,765 B2 and CN 10878020 B disclose prior arts slightly related to the present invention.

[0006] One prior art describes an imager signal transmission structure for a mobile device. This structure reduces the reaction force by bending the FPC that transmits the imager signal twice in the optical axis direction (Z direction) to increase the degree of freedom in the directions perpendicular to the optical axis (X and Y directions).

[0007] Another prior art also describes an imager signal transmission structure for a mobile device, which reduces the thickness of a camera module by widening the imager signal line in a direction perpendicular to the optical axis (Z direction).

[0008] As described above, a sensor-shift OIS system for a mobile device, particularly a three-axis sensor-shift OIS system for a mobile device, requires a special structure to reduce reaction forces in three-axis directions (X, Y, and roll directions) without increasing the size of a camera module.

[0009] In the imager signal transmission structure described in the prior art, the size of the FPC inevitably increases in the Z direction, so the miniaturization of the camera module is limited. In addition, since the FPC needs to be bent multiple times to achieve this structure, there are still some problems in bending accuracy and ease of assembly. It is possible to reduce the size of the camera module in the Z direction. However, in this structure, the size of the camera module becomes larger in the X and Y directions. In addition, since the length of the imager signal line is also shorter, the reaction force will also become larger. Specifically, in this structure, since the reaction force in the rolling direction is large, there are still problems in realizing the three-axis sensor shift OIS system.

[0010] For these reasons, there is a need for an optical image stabilization system that can reduce reaction forces when operating in three axes (X, Y and roll) without increasing the overall size of the camera module. Summary of the invention

[0011] In view of this, an object of the present invention is to provide a novel optical image stabilization system, thereby overcoming or at least alleviating the above-mentioned problems associated with prior art devices. Specifically, a specific object of the present invention is to provide a novel optical image stabilization system, thereby reducing the reaction force when working in three-axis directions (X, Y and rolling directions) without increasing the overall size of the camera module.

[0012] In order to achieve these objectives, the present invention provides an optical image stabilization system for a camera module. The system includes: a moving part including an image sensor; a fixed part including a front opening to expose the image sensor of the moving part to the outside, wherein the image sensor is arranged to correspond to the opening of the fixed part, and the moving part is arranged in the fixed part so that the moving part can be displaced relative to the fixed part; an actuator for displacing the moving part relative to the fixed part to achieve optical image stabilization; a pair of signal transmission members for transmitting signals from the image sensor of the moving part to corresponding signal receiving terminals fixed in place relative to the fixed part, wherein each signal transmission member includes a first end and a second end, the first end of each signal transmission member is electrically connected to the image sensor of the moving part, and the second end of each signal transmission member is electrically connected to the corresponding signal receiving terminal, each signal transmission member is configured as a leaf spring, and each signal transmission member also includes a connecting arm portion, the first end and the second end of each signal transmission member are connected as a whole through the connecting arm portion, and the connecting arm portion of each signal transmission member extends along a non-linear path, wherein the non-linear path starts from the first end, at least partially surrounds the first end, and ends at the second end.

[0013] The present invention also provides a product including a camera module, wherein the camera module includes the optical image stabilization system as described above.

[0014] According to the present invention, a signal transmission member for transmitting a signal from an image sensor to a signal receiving terminal is configured as a leaf spring, and a connecting arm portion of the signal transmission member is configured so that the connecting arm portion extends along a nonlinear path, which starts at a first end of the signal transmission member, at least partially surrounds the first end, and ends at a second end of the signal transmission member. That is, the signal transmission member has a special spring structure that spirals from the center to the periphery. Compared with conventional signal transmission members, this special result can reduce the spring constant in the rotation direction. In addition, through this special spring structure, the signal transmission member can achieve a maximum extension length within a limited available space (i.e., the spiral structure causes the spring to extend to fill the available space). Therefore, compared with conventional signal transmission members, this signal transmission member can also reduce the spring constant in the X and Y directions. Therefore, according to the present invention, an optical anti-shake system can be provided, which can reduce the reaction force when working in three-axis directions (X, Y and rolling directions) without increasing the overall size of the camera module.

[0015] According to a preferred aspect of the present invention, the pair of signal transmission members may be disposed adjacently on a plane along a first direction (i.e., a width direction) of the fixed component, wherein the plane is parallel to a surface of the image sensor of the moving component. Here, the width direction of the fixed component refers to a direction that coincides with the horizontal direction when the device including the camera module is used.

[0016] According to a preferred aspect of the present invention, the pair of signal transmission members can be arranged rotationally symmetrically around the center point of the image sensor of the moving part. Alternatively, according to a preferred aspect of the present invention, the pair of signal transmission members can be arranged symmetrically about a vertical line passing through the center point of the image sensor of the moving part and perpendicular to the first direction of the fixed part. These aspects are particularly preferred in the present invention. This is because these aspects significantly reduce the anisotropy of the displacement movement of the image sensor of the moving part in the X and Y directions and the rotational movement around the Z axis. In other words, by arranging the two signal transmission members in this way, the inherent resistance imbalance of each spring (i.e., each signal transmission member) is effectively offset. Therefore, even if a low-thrust actuator is used in a small mobile device, etc., excellent three-axis optical image stabilization can be achieved. In addition, crosstalk in each direction is eliminated by adjusting this unique structure.

[0017] According to a preferred aspect of the present invention, the connecting arm portion of each signal transmission member may include a plurality of straight segments and a plurality of curved segments connecting adjacent straight segments to each other. In another preferred embodiment of this aspect, the connecting arm portion of each signal transmission member may include at least four straight segments and at least three curved segments of approximately 90 degrees, whereby the connecting arm portion may be spiral. Of course, in another aspect of the present invention, the connecting arm portion of each signal transmission member may include two straight segments and one curved segment (not limited to 90 degrees). Alternatively, according to a preferred aspect of the present invention, the connecting arm portion of each signal transmission member may extend along a spiral path with an increasing radius of curvature. Here, the spiral (or spiral path) includes an incomplete spiral (or incomplete spiral path) that rotates no more than 360°.

[0018] According to a preferred aspect of the present invention, the corresponding signal receiving terminal to which the second end of each signal transmission member is electrically connected is integrated into a single common terminal. In this aspect, the single common terminal can be arranged in an area corresponding to the upper (or lower) periphery of the two signal transmission members. Alternatively, the single common terminal can also be arranged in an area corresponding to the side periphery of the two face-to-face signal transmission members. In a preferred embodiment of this aspect, the second ends of the two signal transmission members can be interconnected or even pre-integrated.

[0019] According to a preferred aspect of the present invention, the connecting arm portion of each signal transmission member can be divided into a plurality of branches by at least one slit extending along the extension direction of the signal transmission member. In a particularly preferred embodiment of this aspect, at least two slits may extend along the extension direction of the signal transmission member, whereby the connecting arm portion of each signal transmission member can be divided into at least three branches. In addition, in this preferred embodiment, it is desired that the spacing between the slits is equal. Of course, in another aspect of the present invention, the spacing between the slits does not need to be equal. That is, the spacing between the branches may be irregular. In the present invention, the number of slits and the number of branches are not particularly limited. However, for example, 2 to 16 branches can be used as needed. Specifically, considering the labor and cost required for manufacturing, it is best to use 4 to 6 branches.

[0020] According to a preferred aspect of the present invention, the signal transmission member may include a metal support layer and at least one conductive layer stacked on the metal support layer. In a particularly preferred embodiment of this aspect, the signal transmission member may include a plurality of conductive layers, wherein the plurality of conductive layers may be stacked together and insulated from each other. The present invention does not particularly limit the number of conductive layers. However, for example, 2 to 6 conductive layers may be used as needed.

[0021] According to a preferred aspect of the present invention, the fixed component may include a back plate for enclosing the movable component inside the fixed component, wherein the corresponding signal receiving terminal to which the second end of each signal transmission member is electrically connected may be provided on the back plate of the fixed component. In this aspect, the signal receiving terminal may be provided in an area on the back plate corresponding to the side periphery of two back-to-back signal transmission members. Alternatively, the signal receiving terminal may be provided in an area on the back plate corresponding to the upper (or lower) periphery of the two signal transmission members, or in an area on the back plate corresponding to the side periphery of two face-to-face signal transmission members.

[0022] According to a preferred aspect of the present invention, the movable part can be pressed against the fixed part by at least three balls arranged around the center point of the image sensor of the movable part. In addition, according to a more preferred aspect, the movable part can be pressed against the fixed part by magnetic attraction. In a particularly preferred embodiment of this aspect, the magnetic attraction can be generated by the interaction between at least one magnet arranged on one side of the fixed part and at least one back yoke arranged on one side of the movable part. Through this particularly preferred arrangement, the freedom of movement in the X and Y directions and the rolling direction (rotational direction) can be ensured, while effectively suppressing the deformation (bending) of the signal transmission component in the Z direction (i.e., the optical axis direction).

[0023] Regarding the product including the camera module, according to a preferred aspect of the present invention, the product may be a device, apparatus, equipment, machine, facility, tool, etc. including the camera module. Specifically, the product may be a terminal device such as a smart phone including the camera module. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Non-limiting and representative embodiments of the present invention will be explained in detail below with reference to the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of a product (ie, a smart phone) including an optical image stabilization (OIS) system provided by an embodiment of the present invention.

[0026] Figure 2 yes Figure 1 A perspective view of the OIS system is shown in the assembled state.

[0027] Figure 3 yes Figure 1 A perspective view of the OIS system is shown in a disassembled state.

[0028] Figure 4 It is along Figure 2 A cross-sectional view of the OIS system taken along line A1-A1 in FIG. 1 (It should be noted that, for ease of understanding, Figure 4 is inverted).

[0029] Figure 5 is a plan view of a pair of signal transmission members arranged side by side.

[0030] Figure 6 is a plan view of a pair of signal transmission members arranged in an alternative manner.

[0031] Figure 7 is a plan view of a pair of signal transmission members having alternative forms.

[0032] Figure 8 is a plan view of an alternative embodiment in which a single common terminal is provided in a region corresponding to the upper circumference of two signal transmission members.

[0033] Fig. 9 is a plan view of an alternative embodiment in which a single common terminal is provided in the area of ​​the side periphery of two facing signal transmission members.

[0034] Fig.10 is a plan view of an alternative embodiment in which two signal transmission members are integrally connected at their upper peripheral edges.

[0035] Fig.11is a plan view of an alternative embodiment in which two signal transmitting members are integrally connected at their facing side edges.

[0036] Fig.12 It is along Figure 5 A cross-sectional view of one branch of the signal transmission member taken along line A2-A2 in FIG.

[0037] Fig.13 It is along Figure 2 A cross-sectional view of the OIS system taken along line A3-A3 in FIG.

[0038] Fig.14 is a front view of the moving part, showing the arrangement of three balls placed between the moving part and the fixed part.

[0039] Fig.15 It is along Figure 2 A cross-sectional view of the OIS system taken along line A4-A4 in FIG.

[0040] Fig.16 It is along Figure 2 A cross-sectional view of the OIS system taken along line A5-A5 in FIG.

[0041] Fig.17 It is a partial perspective view of the moving parts, showing the configuration in which multiple probes are assigned to the actuator coil for power supply.

[0042] Fig.18 It is a partial perspective view of the moving parts, showing the construction of using a flexible printed circuit (FPC) to realize the power supply from the electronic circuit board to the actuator coil. DETAILED DESCRIPTION

[0043] Reference below Figures 1 to 18 Some exemplary embodiments of the present invention are described.

[0044] Terms related to directions such as "up", "down", "upper", "lower", "upward", "downward", "right", and "left" used in this document should be understood to be related to the orientation of the system in the figure, which may or may not match the actual orientation in use.

[0045] The following exemplary embodiments of the present invention relate to an optical image stabilization system for a camera module (but not limited to) for a terminal device (specifically a smart phone) and other products. In addition, the following exemplary embodiments of the present invention also relate to such a product, specifically a mobile electronic device, including a camera module, the camera module including an optical image stabilization system, and the optical image stabilization system is an exemplary embodiment of the present invention. However, the above-mentioned product can be any device, any apparatus, any equipment, any machine, any facility, any tool, etc., including a camera module.

[0046] Figure 1 A mobile electronic device 1, i.e., a smart phone, provided by a preferred embodiment of the present invention is shown. The mobile electronic device 1 includes a camera module 1a built therein. The camera module 1a includes an optical image stabilization system (hereinafter referred to as "OIS system") 10, as described in detail below. The OIS system 10 is placed behind an optical lens 20 of the camera module 1a.

[0047] Figure 2 is a perspective view of the OIS system 10 in an assembled state, Figure 3 is a perspective view of the OIS system 10 in a disassembled state, Figure 4 It is along Figure 2 A cross-sectional view of the OIS system 10 taken along line A1-A1 in FIG. Figures 2 to 4 As can be seen in FIG. 1 , the OIS system 10 for the camera module 1a includes a moving part 100 and a fixed part (i.e., a housing) 200 including the moving part 100. The OIS system 10 also includes an actuator 300, which is used to move the moving part 100 relative to the fixed part 200 to achieve optical image stabilization (see FIG. 1 for details). Figure 3 In this embodiment, the actuator 300 is composed of several components (described in detail below) located in the moving part 100 and the fixed part 200.

[0048] The moving part 100 includes an image sensor 110. The image sensor 110 is covered by an infrared (IR) cut-off filter 112. The image sensor may be an image sensor known to those skilled in the art, and thus a detailed description is omitted. The moving part 100 also includes an electronic circuit board 140 where the image sensor 110 is disposed. The electronic circuit board 140 includes connection terminals 150a, 150b, which are located on opposite sides to the image sensor 110. One end of a signal transmission member described later is connected to the connection terminal 150a or the connection terminal 150b.

[0049] The moving part 100 is arranged in the fixed part 200, so that the moving part 100 can be displaced relative to the fixed part 200 under the action of the actuator 300. Figure 2 In addition, the moving part 100 can be displaceable or translatable in the X and Y directions. Figure 2 In general, the X direction is referred to as the height direction of the OIS system 10 (or the module 1a including the OIS system 10), the Y direction is referred to as the first direction of the OIS system 10, and the Z direction is referred to as the thickness direction of the OIS system 10.

[0050] The fixed part 200 including the moving part 100 includes a front opening (rectangular opening) 210 to expose (accurately, optically expose) the image sensor 110 in the moving part 100 to the outside through the IR cut filter 112. The fixed part 200 includes a back plate 230 for enclosing the moving part 100 therein.

[0051] The actuator 300 for moving the moving part 100 relative to the fixed part 200 is as shown in FIG. Figures 2 to 4 As shown schematically, the actuator 300 is composed of several components such as coils and drivers, which will be described later.

[0052] from Figure 3 and Figure 4 As can be seen in FIG. 1 , the OIS system 10 further includes a pair of signal transmission members 400. The two signal transmission members 400 are used to transmit signals from the image sensor 110 of the moving part 100 to the outside, that is, the corresponding signal receiving terminals 220 fixed in place relative to the fixed part 200. In the present embodiment, the two signal receiving terminals 220 are disposed on the back plate 230 of the fixed part 200. The signal transmission members 400 are also used to keep the image sensor 110 of the moving part 100 in a neutral position when the actuator 300 does not apply a force to the image sensor 110.

[0053] Figure 5 FIG. 4 is a plan view of a pair of signal transmission members 400 arranged side by side. Figure 5 As can be seen in FIG. 1 , each signal transmission member 400 includes a first end 410, a second end 420 and a connecting arm portion 430. The first end 410 and the second end 420 of each signal transmission member 400 are connected as a whole through the connecting arm portion 430. The first end 410 of each signal transmission member 400 is electrically connected to the image sensor 110 of the mobile component 100 via the electronic circuit board 140 (see FIG. 1 ). Figure 4 ). On the other hand, the second end 420 of each signal transmission member 400 is electrically connected to the corresponding signal receiving terminal 220 (see also Figure 4As described above, in the present embodiment, the signal receiving terminal 220 to which the second end 420 of each signal transmission member 400 is electrically connected is provided on the back plate 230 of the fixing part 200 .

[0054] from Figure 2 As can be seen in the figure, each signal transmission member 400 is configured as a leaf spring. The connecting arm portion 430 of each signal transmission member 400 extends along a non-linear path. The non-linear path starts from the first end 410, at least partially surrounds the first end 410, and ends at the second end 420. In this embodiment, the non-linear path along which the signal transmission member 400 extends almost completely surrounds the first end 410. The specific structure of each signal transmission member 400 will be described in detail later.

[0055] refer to Figure 4 and Figure 5 In this embodiment, a pair of signal transmission members 400 are arranged along the width direction of the fixing member 200 (ie, Figure 2 Y direction in the plane P) are arranged adjacently on the plane P (see Figure 4 ). The plane P is parallel to the surface of the image sensor 110 of the moving part 100. More specifically, in this embodiment, the pair of signal transmission members 400 surrounds the center point O of the image sensor 110 of the moving part 100 (see Figure 3 and Figure 5 ) are arranged in rotational symmetry. With this arrangement, the pair of signal transmission members 400 rotate in the same direction.

[0056] In an alternative embodiment, if Figure 6 As shown, a pair of signal transmission members 400 are arranged about a center point O passing through the image sensor 110 (see Figure 3 ) and perpendicular to the width direction Y of the fixing member 200 (see Figure 2 ) is symmetrically arranged about the vertical line L (i.e., the center line). Figure 5 In contrast to the illustrated embodiment, the pair of signal transmitting members 400 rotate in opposite directions relative to each other.

[0057] Reference again Figure 5 In this embodiment, the connecting arm portion 430 of each signal transmission member 400 includes a plurality of straight segments 430a and a plurality of curved segments 430b connecting adjacent straight segments 430a to each other. In this embodiment, the connecting arm portion 430 of each signal transmission member 400 basically includes but is not limited to four straight segments 430a and three curved segments 430b, whereby the connecting arm portion 430 is spiral.

[0058] In addition, in this embodiment, the curved section 430b is a curved section of approximately 90 degrees. In addition, each curved section 430b of the connecting arm portion 430 is circular. In an alternative embodiment, as Figure 7 As shown, the connecting arm portion 430 of each signal transmission member 400 extends along a spiral path with an increasing radius of curvature. The increasing radius of curvature is represented by "C" in the figure. In addition, in this alternative embodiment, a pair of signal transmission members 400 can be arranged rotationally symmetrically around the center point O of the image sensor 110, or can be arranged symmetrically about the vertical line L as described above.

[0059] In this embodiment, if Figure 3 and Figure 4 As shown, the second end 420 of each signal transmission member 400 is electrically connected to the corresponding signal receiving terminal 220 spaced apart. Specifically, the signal receiving terminal 220 is disposed in an area corresponding to the side edges of the two back-to-back signal transmission members 400 on the back plate 230. However, in an alternative embodiment, as shown in FIG. Figure 8 and Fig. 9 As shown, the signal receiving terminals to which the second end 420 of each signal transmission member 400 is electrically connected are integrated into a single common terminal 220 ′, 220 ′.

[0060] exist Figure 8 In an alternative embodiment shown, a single common terminal 220 ′ is provided in an elongated area on the back plate 230 (not shown) corresponding to the upper (or lower) periphery of the two signal transmission members 400 . Fig. 9 In another alternative embodiment shown, a single common terminal 220 ″ is provided in a central region on a back plate 230 (not shown) corresponding to the side peripheries of two facing signal transmission members 400 .

[0061] In yet another alternative embodiment, the second ends 420 of the two signal transmission members 400 are connected to each other or even integrated. Fig.10 As shown, the two signal transmission members 400 are connected as one at their upper edges. In this case, the common connection area 420' (the shaded part in the figure) of the two signal transmission members 400 is electrically connected to a single common terminal, for example, Figure 8 The single common terminal 220' shown. Alternatively, as Fig.11 As shown, the two signal transmission members 400 are connected as one at their facing side edges. In this case, the common connection area 420 ″ (the shaded part in the figure) of the two signal transmission members 400 is electrically connected to a single common terminal, for example, Fig. 9 A single common terminal 220 ″ is shown. In this way, integrating a pair of signal transmission members 400 into one sheet reduces manufacturing costs.

[0062] Reference again Figure 5 , the connecting arm portion 430 of each signal transmission member 400 is divided into a plurality of branches 431a to 431d by a plurality of slits 432a to 432c extending along the extension direction of the signal transmission member 400. Specifically, in the present embodiment, three slits 432a to 432c are provided extending along the extension direction of the signal transmission member 400, whereby the connecting arm portion 430 of each signal transmission member 400 is divided into four branches 431a to 431d. In addition, in the present embodiment, the spacing between the three slits 432a to 432c is equal. However, it should be noted that the spacing between the slits 432a to 432c may not be equal. That is, the spacing between the branches 431a to 431d may be irregular. In order to form the slits 432a to 432c on the signal transmission member 400, laser processing technology, etching processing technology, etc. may be used, but are not limited thereto.

[0063] Fig.12 It is along Figure 5 A cross-sectional view of one branch 431a of the signal transmission member 400 taken along line A2-A2 in FIG. 4 (note that the thickness of the branch 431a is exaggerated). Fig.12 As can be seen in the figure, in this embodiment, the branches 431a to 431d and the signal transmission member 400 include a metal support layer 441 and a plurality of conductive layers 442a to 442d stacked on the metal support layer 441. The metal support layer 441 and the conductive layer 442a at the bottom of the plurality of conductive layers 442a to 442d are bonded together so as not to be spaced apart from each other. Specifically, in this embodiment, the signal transmission member 400 includes four conductive layers 442a to 442d. These conductive layers 442a to 442d are stacked together and insulated from each other.

[0064] The metal support layer 441 is made of copper (or a suitable alloy containing copper) or stainless steel (SUS), etc., but is not limited thereto. On the other hand, each conductive layer 442a to 442d is composed of a conductor 443 and a coating layer 444. The coating layer 444 is made of a plastic such as polyimide, and is disposed outside the conductor 443 to at least partially cover the conductor 443. Each conductive layer 442a to 442d can be initially formed separately and then joined, or can be formed as one piece from the beginning. The signal emitted by the image sensor 110 of the mobile part 100 is sent to the signal receiving terminal 220 via a group of conductors 443. If necessary, the metal support layer 441 can also be used to send a signal to the signal receiving terminal 220.

[0065] Fig.13 It is along Figure 2 A cross-sectional view of the OIS system 10 taken along line A3-A3 in FIG. Figure 3 In addition, you can also Fig.13 As can be seen from the figure, in the present embodiment, the moving part 100 is combined with the fixed part 200 through a plurality of balls 500a to 500c. In addition, in the present embodiment, the moving part 100 is pressed against the fixed part 200 through a plurality of balls 500a to 500c. Specifically, in the present embodiment, three balls 500a to 500c are placed between the moving part 100 and the fixed part 200, but it is not limited thereto.

[0066] Fig.14 The arrangement of the balls is shown in Fig.14 As can be seen in the figure, the three balls 500a to 500c placed between the moving part 100 and the fixed part 200 are arranged around the center point O of the image sensor 110 of the moving part 100. Specifically, the three balls 500a to 500c are arranged in a triangle T. That is, the three balls 500a to 500c are placed on each vertex of the triangle T respectively. In the present embodiment, the center point O of the image sensor 110 of the moving part 100 is located at the center of gravity of the triangle T (for example, an isosceles triangle or an equilateral triangle) formed by the three balls 500a to 500c. The number and arrangement of the balls are not limited thereto, and other numbers (for example, four) and alternative arrangements may also be adopted as needed.

[0067] The reason for placing a plurality of balls 500a to 500c in the OIS system is as follows. The thickness of the signal transmission member 400 configured as a leaf spring is very thin. Therefore, the signal transmission member 400 is easily moved in the Z direction (see Figure 2 ) is deformed in the direction of the optical axis. In this embodiment, in order to ensure that the X and Y directions (see Figure 2 ) and scroll direction (see Figure 2 ) and effectively inhibit the signal transmission member 400 from moving in the Z direction (see Figure 2 ) on the moving part 100, so a plurality of ball bearings 500a to 500c are provided in the OIS system. By adopting this unique structure, it is possible to suppress unnecessary secondary resonance generated in the moving part 100, so that the servo frequency band can be increased by PID control or the like. Other reasons for placing a plurality of ball bearings 500a to 500c in the OIS system are as follows. In this system, since the moving part 100 is suspended by the signal transmission member 400, the moving part 100 is easy to move up and down. This changes the distance between the position sensor such as the Hall sensor (described later) and the magnet (described later), which may cause false detection, that is, failure of the OIS system. In addition, the up and down movement of the image sensor (imager) 110 may cause image instability, that is, blurring, during imaging. By adopting the above-mentioned unique structure, these adverse phenomena can be effectively suppressed.

[0068] In this embodiment, the moving part 100 is pressed against the fixed part 200 by magnetic attraction. The generation mechanism of the magnetic attraction is described in detail below. In this embodiment, the magnetic attraction is generated by the interaction between the magnet disposed on one side of the fixed part 200 and the back yoke (e.g., steel plate) disposed on one side of the moving part 100. More specifically, Fig.15 It is along Figure 2 A cross-sectional view of the OIS system 10 taken along line X4-X4 in FIG. Fig.15 As can be seen in FIG. 1 , the magnetic attraction is generated by the interaction between the magnet 240 disposed on one side of the fixed part 200 and the back yoke 120 disposed on one side of the moving part 100. In this embodiment, a plurality of pairs of magnets 240 and back yokes 120 are installed in the OIS system 10.

[0069] In addition, if Fig.15 As shown, the moving part 100 further includes a position sensor (eg, a Hall sensor or a tunneling magnetoresistive (TMR) sensor) 130 for sensing its position. Fig.14 As shown, in the present embodiment, a plurality of position sensors 130 are disposed at the upper periphery and the opposite side periphery of the moving part 100. Each position sensor 130 is surrounded by a coil of an actuator 300 as described in detail below. Furthermore, in the present embodiment, the back yoke 120 is placed on the back side of the position sensor 130. Furthermore, in the present embodiment, a magnet 240 that interacts with the back yoke 120 is disposed on the fixed part 200 opposite to the back yoke 120, that is, disposed at the side periphery of the fixed part 200. In addition to generating a magnetic attraction force, the back yoke 120 is also used to control the magnetic flux (such as Fig.15 That is, by adjusting (i) the thickness of the back yoke 120, (ii) the distance between the back yoke 120 and the magnet 240, and (iii) the shape of the back yoke 120, an optimal magnetic attraction force (boost) and magnetic flux can be obtained.

[0070] Reference again Fig.14, the moving part 100 includes a pair of coils 310a, 310b and a pair of coils 320a, 320b. In the present embodiment, the pair of coils 310a, 310b and the pair of coils 320a, 320b are elliptical. The pair of coils 310a, 310b are arranged in a row on the upper periphery of the moving part 100 along the longitudinal direction of the moving part 100. On the other hand, the pair of coils 320a, 320b are respectively arranged on the two opposite side peripheries of the moving part 100. The actuator 300 for displacing the moving part 100 relative to the fixed part 200 to achieve optical image stabilization has the pair of coils 310a, 310b and the pair of coils 320a, 320b as main components. More specifically, the pair of coils 310a, 310b is used to displace the moving part 100 in the Y and roll directions (see Figure 2 On the other hand, the pair of coils 320a, 320b is used to move the moving part 100 in the X direction (see Figure 2 ) upward displacement.

[0071] Fig.16 It is along Figure 2 A cross-sectional view of the OIS system 10 taken along line A5-A5 in FIG. Fig.16 As can be seen in FIG. 1 , the moving part 100 further includes drivers 330a, 330b for driving a pair of coils 320a, 320b as the main components of the actuator 300. These drivers 330a, 330b also drive a pair of coils 310a, 310b as the main components of the actuator 300. The pair of coils 310a, 310b and the pair of coils 320a, 320b are cooperatively operated by the drivers 330a, 330b to displace the moving part 100 relative to the fixed part 200, so that the system can present the optical image stabilization function of the OIS system 10. Of course, the number of drivers driving the coils of the actuator 300 is not limited to the present embodiment. Generally speaking, one driver can drive three channels. In the above embodiment, in order to obtain sufficient actuator thrust, two drivers are used (i.e., channel 1: coil 310a; channel 2: coil 310b; channel 3: coil 320a; channel 4: coil 320b). However, if desired, the two drivers may be combined into one (in this case, for example, channel 1: coil 310a; channel 2: coil 310b; channel 3: coil 320a and coil 320b).

[0072] In this embodiment, in order to reduce the overall size of the OIS system 10 and thus reduce the overall size of the camera module 1 a , the coils of the driver and the actuator 300 are stacked. Fig.16The configuration of stacking a pair of coils 320a, 320b and drivers 330a, 330b is shown. Power is provided from the electronic circuit board 140 to the pair of coils 320a, 320b using a probe 350. Fig.17 As further shown, in this embodiment, multiple probes 350 are assigned to one coil. Fig.18 As shown, a flexible printed circuit (FPC) 360 may be used to supply power from the electronic circuit board 140 to the pair of coils 310 a , 310 b and the pair of coils 320 a , 320 b .

[0073] As described above, in an embodiment of the present invention, the signal transmission member 400 for transmitting a signal from the image sensor 110 to the outside (i.e., the signal receiving terminal 220) is configured as a leaf spring. In addition, the connecting arm portion 430 of the signal transmission member 400 is configured so that the connecting arm portion 430 extends along a nonlinear path that starts from the first end 410 of the signal transmission member 400, roughly surrounds the first end 410 once, and ends at the second end 420 of the signal transmission member 400. In other words, the signal transmission member 400 has a unique spring structure that spirals from the center to the periphery. Compared with conventional signal transmission members, this unique structure is particularly capable of reducing the spring constant in the rolling direction (rotational direction). In an embodiment of the present invention, this effect is further enhanced by dividing the signal transmission member 400 into a plurality of branches 431a to 431d.

[0074] Furthermore, through this unique structure, the signal transmission member 400 can achieve a maximum extension length within the limited space available in the OIS system 10. Therefore, the signal transmission member 400 can also reduce the spring constants in the X and Y directions compared to conventional signal transmission members.

[0075] Therefore, according to the above-mentioned embodiment of the present invention, an OIS system 10 can be provided, so that the reaction force when working in three-axis directions (X, Y and rolling directions) can be significantly reduced without increasing the overall size of the camera module 1a.

[0076] In addition, according to the above-mentioned embodiment of the present invention, the pair of signal transmission members 400 are arranged rotationally symmetrically around the center point O of the image sensor 110 of the moving part 100. In addition, according to an alternative embodiment of the present invention, the pair of signal transmission members 400 are arranged symmetrically about a vertical line L passing through the center point O of the image sensor 110 and perpendicular to the width direction (Y direction) of the fixed part 200. These arrangements significantly reduce the anisotropy of the displacement movement of the image sensor 110 in the X and Y directions and the rotational movement around the Z axis. Therefore, even if a low-thrust actuator is used in a small mobile device, excellent three-axis optical image stabilization can be achieved.

[0077] The preferred embodiments of the present invention have been explained above with reference to the relevant drawings. However, the present invention is not limited to these embodiments, and various modifications and changes can be made to the above embodiments without departing from the spirit and scope of the present invention, and such modifications and changes are also included in the scope of the present invention.

Claims

1. An optical image stabilization system (10) for a camera module (1a), characterized in that: The system comprises: A moving part (100) including an image sensor (110); a fixed component (200) comprising a front opening (210) for exposing the image sensor (110) of the movable component (100) to the outside, wherein the image sensor (110) is arranged to correspond to the opening of the fixed component (200), the movable component (100) is arranged inside the fixed component (200), and the movable component (100) is capable of displacement relative to the fixed component (200); An actuator (300) used to displace the moving component (100) relative to the fixed component (200) to achieve optical image stabilization; a pair of signal transmission members (400) for transmitting a signal from the image sensor (110) of the moving part (100) to a corresponding signal receiving terminal (220) fixed on the fixed part (200), wherein each signal transmission member (400) comprises a first end (410) and a second end (420), the first end (410) of each signal transmission member (400) being electrically connected to the image sensor (110) of the moving part (100), and the second end (420) of each signal transmission member (400) being electrically connected to the corresponding signal receiving terminal (220), Each signal transmission member (400) is configured as a leaf spring. Each signal transmission member (400) further comprises a connecting arm portion (430), and the first end (410) and the second end (420) of each signal transmission member (400) are connected as a whole via the connecting arm portion (430). The connecting arm portion (430) of each signal transmission member (400) extends along a path between the first end (410) and the second end (420) of each signal transmission member (400) and surrounds the first end (410).

2. The optical image stabilization system (10) according to claim 1, characterized in that: The pair of signal transmission members (400) are adjacently arranged on a plane (P) along a first direction (Y) of the fixed component (200), wherein the plane (P) is parallel to a surface of the image sensor (110) of the moving component (100).

3. The optical image stabilization system (10) according to claim 2, characterized in that: The pair of signal transmission members (400) are arranged rotationally symmetrically around a center point (O) of the image sensor (110) of the moving part (100).

4. The optical image stabilization system (10) according to claim 2, characterized in that: The pair of signal transmission members (400) are symmetrically arranged about a vertical line (L) passing through a center point (O) of the image sensor (110) of the moving part (100) and perpendicular to the first direction (Y) of the fixed part (200).

5. The optical image stabilization system (10) according to any one of claims 1 to 4, characterized in that: The connecting arm portion (430) of each signal transmission member (400) includes a plurality of straight segments (430a) and a plurality of curved segments (430b) connecting adjacent straight segments (430a) to each other.

6. The optical image stabilization system (10) according to claim 5, characterized in that: The connecting arm portion (430) of each signal transmission member (400) includes at least four straight segments (430a) and at least three approximately 90-degree curved segments (430b), whereby the connecting arm portion (430) is spiral-shaped.

7. The optical image stabilization system (10) according to any one of claims 1 to 4, characterized in that: The connecting arm portion (430) of each signal transmission member (400) extends along a spiral path with a continuously increasing radius of curvature.

8. The optical image stabilization system (10) according to any one of claims 1 to 7, characterized in that: The corresponding signal receiving terminal (220) to which the second end (420) of each signal transmission member (400) is electrically connected is integrated into a single common terminal (220').

9. The optical image stabilization system (10) according to any one of claims 1 to 8, characterized in that: The connecting arm portion (430) of each signal transmission member (400) is divided into a plurality of branches (431a to 431d) by at least one slit (432a to 432c) extending along an extending direction of the signal transmission member (400).

10. The optical image stabilization system (10) according to claim 9, characterized in that: At least two slits (432a to 432c) extend along the extension direction of the signal transmission member (400), whereby the connecting arm portion (430) of each signal transmission member (400) is divided into at least three branches (431a to 431d).

11. The optical image stabilization system (10) according to claim 10, characterized in that: The slits (432a to 432c) are spaced at equal intervals.

12. The optical image stabilization system (10) according to any one of claims 1 to 11, characterized in that: The signal transmission member (400) includes a metal support layer (441) and at least one conductive layer (442a to 442d) stacked on the metal support layer (441).

13. The optical image stabilization system (10) according to claim 12, characterized in that: The signal transmission member (400) includes a plurality of conductive layers (442a to 442d), wherein the plurality of conductive layers (442a to 442d) are stacked together and insulated from each other.

14. The optical image stabilization system (10) according to any one of claims 1 to 13, characterized in that: The fixed component (200) comprises a back plate (230) for enclosing the moving component (100) inside the fixed component (200), wherein the corresponding signal receiving terminal (220) to which the second end (420) of each signal transmission member (400) is electrically connected is arranged on the back plate (230) of the fixed component (200).

15. The optical image stabilization system (10) according to any one of claims 1 to 14, characterized in that: The moving component (100) is pressed against the fixed component (200) by at least three balls (500a to 500c) arranged around a center point (O) of the image sensor (110) of the moving component (100).

16. The optical image stabilization system (10) according to claim 15, characterized in that: The moving component (100) is pressed against the fixed component (200) by magnetic attraction.

17. The optical image stabilization system (10) according to claim 16, characterized in that: The magnetic attraction force is generated by the interaction between at least one magnet (240) arranged on one side of the fixed component (200) and at least one back yoke (120) arranged on one side of the moving component (100).

18. A terminal device (1) comprising a camera module (1a), characterized in that: The camera module (1a) comprises an optical image stabilization system (10) according to any one of claims 1 to 17.

Images