Flexible circuit board, camera module and assembly method of flexible circuit board

Abstract

The present invention relates to the technical field of imaging devices, and discloses a flexible circuit board, a camera module, and an assembly method of a flexible circuit board, wherein the flexible circuit board comprises a connection assembly, the connection assembly comprises a connection portion, and a plurality of flexible connection belts arranged at intervals around the connection portion, each flexible connection belt spirally extends in the same direction around the connection portion; wherein at least two flexible connection belts are provided with a first connection terminal at one end away from the connection portion, and each two of the first connection terminals are electrically connected. Since the connection assembly comprises a plurality of flexible connection belts, only a small material stress needs to be overcome when bending; the flexible connection belt extends in a spiral shape, has a certain amount of redundancy, and only a small resistance needs to be overcome when stretched.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging devices, and in particular to a flexible circuit board, a camera module and an assembling method of the flexible circuit board. Background Art

[0002] The camera module generally includes a lens group and an image sensor. The lens group is located on one side of the imaging surface of the image sensor. The light entering through the lens group reaches the imaging surface of the image sensor and forms an image on the imaging surface.

[0003] The image sensor is installed on a movable circuit board. The movable circuit board moves horizontally (perpendicular to the optical axis) relative to the fixed circuit board. The movable circuit board and the horizontal circuit board are connected by a soft board. In order to ensure sufficient routing width, the width of the soft board is designed to be relatively large. Due to the material properties of the soft board, it will bring certain resistance when the movable circuit board moves horizontally, and the focusing speed is affected. Summary of the invention

[0004] The invention discloses a camera module, which is used for improving the flexibility of a connection component, reducing resistance during focusing, and improving focusing speed.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, a flexible circuit board is provided for use in a camera module, wherein the flexible circuit board includes a connection component, the connection component includes a connection portion, and a plurality of flexible connection bands spaced apart around the connection portion, each of the flexible connection bands extending spirally in the same direction around the connection portion; wherein at least two of the flexible connection bands are provided with a first connection terminal at one end away from the connection portion, and every two of the first connection terminals are electrically connected.

[0007] In the above-mentioned flexible circuit board, when a part of the first connection terminals is connected to the circuit board for carrying the image sensor, and another part of the first connection terminals is connected to the connector and other fixed parts relative to the housing of the camera module, the image sensor can move relative to the fixed part and can be electrically connected to the connector; wherein, since the connection component includes a plurality of flexible connection belts, the flexible connection belt is in the shape of a belt while ensuring that the amount of wiring remains unchanged, and only a small material stress needs to be overcome when bending; and the flexible connection belt extends in a spiral, and relative to the linear strip structure, it has a certain amount of redundancy, and only a small resistance needs to be overcome when stretched. Therefore, when the image sensor is focused, the resistance to the movement of the image sensor is reduced.

[0008] There are many ways to spirally extend the flexible connecting belt. In a specific feasible implementation scheme, each of the flexible connecting belts includes a plurality of segments connected in sequence, and each two adjacent segments are bent and connected to form a bending structure. The bending structure formed by the bending connection forms a spiral structure with a certain degree of redundancy, which is beneficial to reducing the resistance that needs to be overcome when the flexible connecting belt is deformed.

[0009] The angles between adjacent segments can be in various forms to form connection components of different shapes. In a specific embodiment, each two adjacent segments are vertically connected. The outer contour of the connection component is roughly square to adapt to the square image sensor chip.

[0010] In a specific implementation scheme, the flexible circuit board also includes an outer frame circuit board, the middle part of the outer frame circuit board has a first hollow structure, the connection component is located in the first hollow structure, and part of the first connection terminals are integrally connected to the inner side of the first hollow structure. The outer frame circuit board can reduce the overall thickness of the camera module in the optical axis direction by providing the first hollow structure to accommodate the connection component, and can be used to carry fixed components to achieve conduction between the connection component and the external circuit.

[0011] In a specific implementation scheme, the first connecting terminals integrally connected to the inner side of the first hollow structure are distributed at two corners of the same diagonal line of the outer contour of the connecting component to achieve force balance of the connecting component at two force points.

[0012] Optionally, the connecting component also includes a strip-shaped force-equalizing extension portion, which extends in a direction parallel to the outer contour of the connecting component; the first connecting terminal of the flexible connecting band is connected to the force-equalizing extension portion; so as to facilitate connection with the movable circuit board through the force-equalizing extension portion, so that the connecting component is subjected to uniform force in all directions.

[0013] In a specific implementation scheme, at least one of the first connecting terminals is provided at each corner of the outer contour of the connecting component; the extension direction of each of the first connecting terminals is perpendicular to one of the side edges corresponding to the corner; so as to achieve balance of the connecting component at four force points.

[0014] In a specific implementation scheme, at least two of the first connecting terminals are distributed on two opposite sides of the outer contour of the connecting component to facilitate a "Z"-shaped connection between the fixed part and the movable circuit board respectively connected on opposite sides of the connecting component.

[0015] In a specific implementation scheme, the flexible circuit board also includes a first circuit board and a second circuit board, and the first circuit board, the connecting component and the second circuit board are arranged in sequence along the spiral axis direction of the connecting component; the first connecting terminal on one side of the outer contour of the connecting component is connected to the corresponding edge of the first circuit board, and the first connecting terminal on the other side is connected to the corresponding edge of the second circuit board; wherein the first circuit board serves as a movable circuit board and the second circuit board serves as a fixed part, and the two are flexibly connected through the connecting component; so that the spiral structure of the connecting component is formed by patterning a whole motherboard and then folded into a "Z" type structure, thereby simplifying the preparation process.

[0016] Optionally, at least two adjacent first connection terminals of the flexible connection strips are connected to form a second connection terminal, and the second connection terminal has an increased area compared to a first connection terminal, so as to improve the connection stability.

[0017] Optionally, at least two of the second connecting terminals are axially symmetrical about the spiral axis of the connecting assembly to improve force uniformity.

[0018] Optionally, at least one second hollow structure is provided in the middle of each connecting portion to further improve the flexibility of the connecting component and reduce deformation resistance.

[0019] In a second aspect, a camera module is provided, which includes a fixed component, a first circuit board, an image sensor, and a flexible circuit board described in any one of the first to eighth and tenth to twelfth technical solutions, wherein the image sensor is located on the first circuit board; wherein a part of the first connecting terminals is connected to the fixed component, and another part of the first connecting terminals is connected to the first circuit board, so that the first circuit board is electrically connected to the fixed component and can move relative to the fixed component.

[0020] In the above-mentioned camera module, the first circuit board can carry the image sensor and move relative to the fixed component, and realize electrical connection with the fixed component; wherein, since the connection component includes a plurality of flexible connection belts, the flexible connection belts are in the shape of belts while ensuring that the amount of wiring remains unchanged, and only need to overcome a small material stress when bending; and the flexible connection belts extend in a spiral shape, and relative to the linear strip structure, they have a certain amount of redundancy, and only need to overcome a small resistance when stretched. Therefore, during the focusing and anti-shake process of the image sensor, the resistance to the movement of the image sensor is reduced.

[0021] According to a third aspect, another camera module is provided, which includes a connector, an image sensor, and a flexible circuit board provided by the eighth technical solution; wherein the connector is connected to the second circuit board, and the image sensor is installed on a surface of the first circuit board facing away from the second circuit board.

[0022] In the above-mentioned camera module, the first circuit board can carry the image sensor and move relative to the second circuit board, and realize electrical connection with the second circuit board; wherein, since the connection assembly includes a plurality of flexible connection belts, the flexible connection belts are in the shape of belts while ensuring that the amount of wiring remains unchanged, and only need to overcome a small material stress when bending; and the flexible connection belts extend in a spiral shape, and relative to the linear strip structure, they have a certain amount of redundancy, and only need to overcome a small resistance when stretched. Therefore, during the focusing and anti-shake process of the image sensor, the resistance to the movement of the image sensor is reduced.

[0023] In a fourth aspect, a method for assembling a flexible circuit board is provided, the method comprising: providing a motherboard, the motherboard comprising a first circuit board, a second circuit board and a connecting component, the connecting component comprising a connecting portion, and a plurality of flexible connecting belts spaced around the connecting portion, each of the flexible connecting belts extending spirally in the same direction around the connecting portion, the first circuit board and the second circuit board are arranged on both sides of a spiral axis of the connecting component; wherein an end of a portion of the flexible connecting belt away from the connecting portion is connected to the first circuit board, and an end of another portion of the flexible connecting belt away from the connecting portion is connected to the second circuit board; folding the connecting component to one side of the first circuit board; and folding the second circuit board to a side of the connecting component away from the first circuit board.

[0024] Through the above-mentioned assembly method, a "Z"-shaped folding structure can be obtained by directly folding a whole motherboard with a connecting component twice. There is no need to assemble the first circuit board, the second circuit board and the connecting component. It is simple and fast, the preparation process is simple, and because it is an integrated connection, it has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A cross-sectional view of a camera module provided in an embodiment of the present application;

[0026] Figure 2 Show Figure 1 Schematic diagram of the first structure of the connecting components;

[0027] Figure 3 Show Figure 1 A schematic diagram of the cooperation between the second circuit board, the first circuit board and the connection assembly;

[0028] Figure 4Show Figure 1 A schematic diagram of the expansion when the second circuit board, the first circuit board and the connecting assembly are an integrated structure;

[0029] Figure 5 Show Figure 1 A second structural diagram of the connecting component;

[0030] Figure 6 Show Figure 1 Schematic diagram of the third structure of the connecting component;

[0031] Figure 7 Show Figure 1 Schematic diagram of the fourth structure of the connecting component;

[0032] Figure 8 Show Figure 1 A fifth structural diagram of the connecting component;

[0033] Fig. 9 A schematic diagram showing the structure of a flexible circuit board in a camera module provided in an embodiment of the present application;

[0034] Fig.10 It showed Fig. 9 A schematic diagram of the structure when the flexible circuit board cooperates with the image sensor through the gasket;

[0035] Fig.11 Given Fig. 9 A schematic diagram of the structure of the flexible circuit board when it cooperates with the image sensor by forming a protruding structure on the surface of the force-averaging extension portion;

[0036] Fig.12 It showed Fig. 9 The first deformation structure of the flexible circuit board shown;

[0037] Fig.13 It showed Fig.12 A further deformed structure of the flexible circuit board shown;

[0038] Fig.14 It showed Fig. 9 The second deformation structure of the flexible circuit board is shown. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] For details, please refer to Figure 1 The embodiment of the present application provides a camera module 100, wherein the second circuit board 8 is arranged in parallel with the first circuit board 10, and the "parallel" here allows for engineering errors, and the orthographic projection of the first circuit board 10 on the second circuit board 8 is located in the middle of the second circuit board 8. The image sensor 2 is bonded to the surface of the first circuit board 10 away from the second circuit board 8 by glue 1, and the image sensor 2 is connected to the first circuit board 10 by gold wire 7. The first circuit board 10 may also be provided with electronic devices 17 such as capacitors and inductors; the first circuit board 10 may also play a role in strengthening and sealing the module. A first bracket 12 in the shape of a groove is inverted on the second circuit board 8, and the vertical part of the first bracket 12 extends along the edge of the second circuit board 8. A second bracket 11 in the shape of a groove is inverted on the first circuit board 10, and the vertical part of the second bracket 11 extends along the edge of the first circuit board 11. An opening is provided at the position where the first bracket 12 is opposite to the first circuit board 10, and an opening is provided at the position where the second bracket 11 is opposite to the image sensor 2. An infrared cut-off filter 13 is provided at the opening of the second bracket 11; and the second bracket 11 extends inwardly to a position opposite to the first bracket 12. The second bracket 11 and the first bracket 12 are connected by a suspension wire structure 16. The suspension wire structure 16 mainly plays a supporting role. In addition to the suspension wire structure, other supporting structures with supporting functions such as springs, silicon chips and films can also be used. A magnet 5 is provided at the edge of the second circuit board 8, and the magnet 5 is located inside the first bracket 12. A coil 6 is provided at the edge of the first circuit board 10, and the coil 6 is located inside the second bracket 11. The magnet 5 serves as the first driving member, the coil 6 constitutes the second driving member, and the first driving member and the second driving member together constitute a driving assembly. The magnetic force between the magnet 5 and the energized coil 6 drives the first circuit board 10 to move relative to the first circuit board 8 in a direction parallel to the reference plane. The reference plane can be the plane where the surface of the second circuit board 8 faces the reinforcement plate 9. The positions of the magnet 5 and the coil 6 can be interchanged, and other first driving members with magnetic properties can also be used to drive the second driving member to move laterally using magnetic force. In addition to the form of coils and magnets, the driving assembly can also be an SMA, Piezo and OIS motor, etc.

[0041] A voice coil motor 14 is provided above the first bracket 12, and a lens group 15 is provided inside the voice coil motor 14. The voice coil motor 14 moves the lens group 15 away from or close to the image sensor 2 along the optical axis to adjust the image distance. The voice coil motor 14 can also be other driving devices with a longitudinal driving function, wherein the lens group 15, the infrared cutoff filter 13 and the image sensor 2 are arranged in sequence along the optical axis, and the light enters from the lens group 15 and passes through the infrared cutoff filter 13 and the image sensor 2 in sequence. The infrared cutoff filter 13 can filter out infrared interference in the environment.

[0042] In order to achieve conduction between the second circuit board 8 and the first circuit board 10, the second circuit board 8 and the first circuit board 10 are connected by a connecting component 4 to carry the wiring between the two circuit boards; wherein the connecting component 4 is located between the second circuit board 8 and the first circuit board 10, and the connecting component 4 can be formed by patterning a flexible printed circuit (FPC). Compared with placing the first circuit board 10 in the hollow of the second circuit board 8 and setting the connecting component between the sides of the second circuit board 8 and the first circuit board 10, the occupied area can be saved when the plane where the second circuit board 8 is located is placed upward.

[0043] Figure 2 A possible structure of the connection component 4 is shown, referring to Figure 2 The connection component 4 includes a connection portion 4k located in the middle, and flexible connection belts (4a, 4b, 4c and 4d). The connection portion 4k is exemplarily a square; the flexible connection belt 4a is taken as an example to explain its extension method: the flexible connection belt 4a includes a plurality of segments connected vertically in sequence, the first segment is connected to the right side of the connection portion 4k (one end in the positive direction of the x-axis), and then, the vertical line L1 passing through the geometric center of the connection portion 4k is used as the spiral axis to extend clockwise and downward (in the negative direction of the y-axis), the second segment extends to the left (in the negative direction of the x-axis), and the third segment extends upward (in the positive direction of the y-axis), ..., and so on, the segments of the flexible connection belt 4a are connected vertically in the clockwise direction in sequence to form a spiral structure, and the outermost circle of the flexible connection belt 4a extends from the upper side along the positive direction of the x-axis, and its end protrudes a section in the positive direction of the x-axis relative to the outer contour R of the connection component, and the protruding section is called the first connection terminal 5a of the flexible connection belt 4a. Every two adjacent segments in the flexible connecting belt 4a are vertically connected, and a bending structure is formed between the two adjacent segments. The number of bending structures is between 2 and 8, so as to take into account the width of the flexible connecting belt a and the size of the image sensor 2. For example, segment z1 and segment z2 are vertically connected, and the same connection method is adopted between the other adjacent segments, which is conducive to forming a structure with a roughly square outer contour R, which is convenient for matching the shapes of the second circuit board 8 and the first circuit board 10, and also convenient for matching the shape of the square image sensor 2. However, it should be noted that the vertical connection between the two adjacent segments of the flexible connecting belt 4a is only exemplary, and every two adjacent segments can also be bent and connected at other angles to form a connection component with different contours to adapt to image sensors of different shapes; in addition, the flexible connecting belt can also be spirally extended along an arc track, which can also achieve the effect of reducing the material stress that needs to be overcome during deformation.

[0044] Similarly, one end of the flexible connecting belt 4b is connected to the lower side of the connecting portion 4k and extends in a clockwise spiral. The outermost circle of the flexible connecting belt 4b is located on its rightmost side and protrudes to the right at the lower end to form a first connecting terminal 5b.

[0045] One end of the flexible connecting belt 4c is connected to the left side of the connecting portion 4k and extends in a clockwise spiral. The outermost circle of the flexible connecting belt 4b is located at its lowermost side and extends to the left, and its end protrudes to the left to form a first connecting terminal 5c.

[0046] One end of the flexible connecting belt 4d is connected to the upper side of the connecting portion 4k and extends in a clockwise spiral. The outermost circle of the flexible connecting belt 4d is located on its leftmost side and extends upward. At the uppermost end, it protrudes to the left side to form a first connecting terminal 5d.

[0047] The outer contour R of the connection assembly formed along the outermost side of the flexible connection strips (4a, 4b, 4c and 4d) is roughly square, which is conducive to matching with the square image sensor. Figure 2 And every two first connection terminals are electrically connected, such as the first connection terminal 5a is electrically connected to the first connection terminal 5d through a wiring, and the first connection terminal 5b is electrically connected to the first connection terminal 5c through a wiring.

[0048] exist Figure 2 In the figure, the first connecting terminals (5a, 5b, 5c and 5d) are respectively arranged at the four corners of the outer contour of the connecting component 4, wherein the first connecting terminals 5a and 5b extend perpendicularly to the right side of the outer contour of the connecting component 4, and the first connecting terminals 5c and 5d extend perpendicularly to the left side of the outer contour of the connecting component 4.

[0049] The flexible connecting strips (4a, 4b, 4c and 4d) are spaced apart from each other to avoid mutual interference during deformation.

[0050] exist Figure 2 In the figure, the connection component 4 includes 4 flexible connection belts, such as 4a, 4b, 4c and 4d, but this is only exemplary, as long as it includes multiple, specifically at least two flexible connection belts, more specifically 5, 6 or even more. As long as one end of a part of the flexible connection belt away from the connection part is connected to the second circuit board, and the other end of the flexible connection belt away from the connection part is connected to the first circuit board. Moreover, each flexible connection belt is not limited to extending in a clockwise spiral, but can also extend in a counterclockwise spiral. The above-mentioned two parts of the first connection terminals are connected through the line, and finally the conduction between the first circuit board and the second circuit board is achieved.

[0051] Figure 3 Show Figure 1 The top view of the second circuit board 8, the first circuit board 10 and the connecting component 4 is shown in FIG. Figure 3 , the connection component 4 is located between the second circuit board 8 and the first circuit board 10. The first connection terminals 5a and 5b are connected to the edge of the first circuit board 10, as shown at A and B; the first connection terminals 5a and 5b are connected to the edge of the second circuit board 8, as shown at C and D. Since the flexible connection belts (4a, 4b, 4c and 4d) are all spirally extended around the axis L1 of the connection portion 4k, the axis L1 is the spiral axis of the connection component 4, the second circuit board 8, the connection component 4 and the first circuit board 10 are arranged along the spiral axis, and all have a certain degree of redundancy. When the first circuit board 10 moves laterally (XY direction) relative to the second circuit board 8, the flexible connection belts (4a, 4b, 4c and 4d) can provide sufficient redundancy to deform, and only need to overcome a small material stress, which is convenient for fast focusing.

[0052] exist Figure 3 In the structure shown, the flexible connecting strips 4a and 4b are connected to the first circuit board 10 by bonding or welding using the ACF (Anisotropic Conductive Film) process, but this is only exemplary. The flexible connecting strips 4a and 4b can also be an integrated structure with the first circuit board 10. Similarly, the connection method of the flexible connecting strips 4c and 4d to the second circuit board 8 can refer to the connection method of the flexible connecting strips 4a and 4b to the first circuit board 10.

[0053] Figure 4 FIG. 1 shows a schematic diagram of an expanded structure when the second circuit board 8, the first circuit board 10 and the connecting component 4 are an integrated structure, referring to FIG. Figure 4 After forming, the first connection terminals 5a and 5b are integrally connected to the left side of the first circuit board 10, and the first connection terminals 5c and 5d are integrally connected to the right side of the second circuit board 8. This structure can be directly formed by patterning a whole piece of flexible circuit board through etching and other processes. The process is simple, the structure is firm, the second circuit board 8, the first circuit board 10 and the connection component 4 are not easy to separate, and the installation is convenient. When in use, the second circuit board 8, the first circuit board 10 and the connection component 4 are directly folded twice (the assembly method will be described later through relevant embodiments), so that the connection component 4 is located between the second circuit board 8 and the first circuit board 10, forming a "Z"-shaped integrated structure, without the need to sequentially bond and assemble the second circuit board 8, the first circuit board 10 and the connection component 4.

[0054] exist Figure 2 and Figure 3In the structure shown, each corner of the outer contour R of the connecting component 4 is provided with a first connecting terminal, and every two first connecting terminals are located on one of the two opposite sides. However, this is only exemplary, and the two opposite sides mentioned above do not necessarily have to be provided with two first connecting terminals respectively, and only one, or more than three, may be retained. As long as at least two first connecting terminals are distributed on the two opposite sides of the outer contour of the connecting component, and it is ensured that the two opposite sides of the connecting component have first connecting terminals, such a flexible circuit board structure can be directly formed into a "Z"-shaped structure by folding. For another example, the outer contour R of the connecting component 4 is not limited to only providing the first connecting terminal at the corner of the outer contour R, and the first connecting terminal can also be provided in the middle of any one or several sides of the outer contour R, and each first connecting terminal can be perpendicular (there may be errors in the engineering sense) to the corresponding side of the outer contour R.

[0055] In addition, the form of the connection component 4 is not limited to Figure 2 In the structure shown, the four first connecting terminals ( 5 a , 5 b , 5 c and 5 d ) may also be located on four different sides of the connecting component 4 , respectively. Figure 5 Show Figure 2 A variation of the connection assembly shown, Figure 5 and Figure 2 The difference is that the first connection terminal 5d is located on the upper side of the outer contour R of the connection component 4 and extends straight upward; the first connection terminal 5b is located on the lower side of the outer contour R of the connection component 4. The first connection terminals 5a and 5b can be connected to the first circuit board 10, and the first connection terminals 5c and 5d can be connected to the second circuit board 8. The connection component 4 of this shape can also reduce resistance when the first circuit board 10 is driven horizontally, so as to achieve the purpose of fast focusing.

[0056] Figure 6 Show Figure 5 A variation of Figure 6 The components shown are connected with Figure 5 The difference between the connecting components shown is that the flexible connecting belts (4a, 4b, 4c and 4d) are changed to counterclockwise spirals; and each flexible connecting belt is provided with a first hollow strip extending along the extension direction of the flexible connecting belt in the middle, and the first hollow strip U1 in the flexible connecting belt 4a can be specifically referred to, so as to further improve the flexibility of the flexible connecting belt 4a, reduce the resistance of the first circuit board 10 when it moves relative to the second circuit board 8, and improve the zoom speed. Alternatively, it is also possible to Figure 6The structure shown is described as follows: the first connecting terminal 5a' of the adjacent flexible connecting strip 4a' and the first connecting terminal 5a" of the flexible connecting strip 4a" are connected to form a second connecting terminal 6a. By merging the first connecting terminals of the multiple flexible connecting strips into one second connecting terminal, the connection area with the first circuit board 10 is increased, which is beneficial to the stability of the connection. Similarly, each of the remaining two adjacent first connecting terminals is also formed with second connecting terminals 6b, 6c and 6d in sequence. And the second connecting terminal 6a and the second connecting terminal 6c are symmetrical about the spiral axis L1, and the second connecting terminal 6b and the second connecting terminal 6d are symmetrical about the spiral axis L1. However, as long as at least two second connecting terminals are symmetrical about the spiral axis L1 of the connecting component, the force on the connecting component 4 can be more balanced. It should be noted that at least two second connecting terminals can also be centrally symmetrical or rotationally symmetrical, as long as they are symmetrical about the spiral axis L1, which facilitates the force balance between the connecting component 4 and the first circuit board 10. Among them, the number of first hollows in each flexible connecting strip is not necessarily one, but can also be multiple. As Figure 7 Show Figure 6 A variation of this invention is that two first hollows U1 are arranged spaced apart and side by side in each flexible connecting belt. And a second hollow U2 is provided in the connecting portion 4k. Thereby, the softness of the entire connecting component 4 can be further improved, and the mass of the connecting component 4 can be reduced. Similarly, or, another expression can be made: the first connecting terminal 5a' of adjacent flexible connecting belts 4a', the first connecting terminal 5a" of the flexible connecting belt 4a", and the first connecting terminal 5a"' of the flexible connecting belt 4a"' are connected to form a second connecting terminal 6a; similarly, second connecting terminals 6b, 6c and 6d are formed.

[0057] Figure 8 Another deformation structure of the connection component is shown. Figure 2The difference of the structure shown is that the number of flexible connecting belts is increased to 8, which are the flexible connecting belts (4e, 4f, 4g, 4h, 4i, 4j, 4m and 4n) in sequence, and the flexible connecting belts (4e, 4f, 4g, 4h, 4i, 4j, 4m and 4n) all extend in a counterclockwise spiral, and the ends of the flexible connecting belts (4e, 4f, 4g, 4h, 4i, 4j, 4m and 4n) are formed with first connecting terminals (5e, 5f, 5g, 5h, 5i, 5j, 5m and 5n) in sequence. Two first connecting terminals are respectively distributed at each corner of the outer contour R of the connecting component 4. For example, the first connecting terminals 5e and 5f in the upper right corner are located at the upper right corner of the outer contour R of the connecting component 4, wherein the first connecting terminal 5e is perpendicular to the upper side of the outer contour R, and the first connecting terminal 5ef is perpendicular to the right side of the outer contour R. The first connection terminals (5g, 5h, 5i, 5j, 5m and 5n) are distributed in the other corners of the outer contour R in a similar manner. Thus, each corner of the outer contour R is distributed with a first connection terminal, and the two first connection terminals are perpendicular to the two sides of the corner in a one-to-one correspondence. Among them, the first connection terminals 5n, 5e, 5f and 5g can be connected to the second circuit board 8, and the first connection terminals 5h, 5i, 5g and 5m can be connected to the first circuit board 10. Whether the first circuit board 10 moves along the x-axis or the y-axis, the connection component 4 can provide a certain redundancy, reduce resistance, increase focusing speed, and make the force distribution of the connection component 4 more uniform.

[0058] But it should be understood that Figure 8 Only one first connection terminal may be reserved at a corner, which can also achieve the above effect to a certain extent. It is sufficient to ensure that at least one first connection terminal is provided at each corner of the outer contour of the connecting component; and the extension direction of each first connection terminal is perpendicular to one of the side edges corresponding to the corner.

[0059] Fig. 9 A schematic diagram showing the structure of a flexible circuit board in a camera module provided in an embodiment of the present application is shown. Fig.10 Indicates when Fig. 9 FIG. 1 is a schematic diagram of the flexible circuit board in cooperation with the image sensor through the gasket. In addition to cooperating with the first circuit board 10 and the second circuit board 8 to reduce the resistance of the image sensor 2 to lateral movement, the connecting component 4 can also be used. Fig. 9 The structure shown. Fig. 9In the figure, the camera module also includes an outer frame circuit board Q, which has a square first hollow structure M in the middle. The connecting component 4 is arranged in the first hollow structure M, and the side edges of the outer contour of the connecting component 4 are basically parallel to the side edges of the first hollow structure M in a one-to-one correspondence. Each flexible connecting belt of the connecting component 4 extends in a counterclockwise spiral. The flexible connecting parts 4a and 4c are symmetrical about the spiral axis of the connecting component, and the first connecting terminals of the flexible connecting parts 4a and 4c are respectively connected to the inner sides of the first hollow structure M (such as an integrated connection), which is beneficial to the balanced force of the connecting component 4. The first connecting terminals of the flexible connecting parts 4a and 4c are respectively connected to the force balancing extension parts 4s and 4k extending in the y-axis direction. The force balancing extension parts 4s and 4k are distributed on the left and right sides of the connecting component 4 and are respectively connected to the graphic sensor 2. The force balancing extension parts 4s and 4k are located on both sides of the connecting component 4, which is beneficial to the balanced force of the connecting component 4. Among them, in Fig. 9 In the embodiment, the first connection terminals of the flexible connection parts 4a and 4c are connected to the connector 18 by indirect connection through the outer frame circuit board Q, so as to realize the conduction between the connection component 4 and the connector 18. In addition, the annular structure of the outer frame circuit board Q is conducive to the limitation of the connection component 4.

[0060] And reference Fig.10 The image sensor 2 is located on the force-equalizing extension parts 4s and 4k, and gaskets T1 and T2 are provided between the force-equalizing extension parts 4s and 4k in sequence, so that a certain gap is maintained between the image sensor 2 and the connecting component 4 to prevent friction; the image sensor 2 and the force-equalizing extension parts 4s and 4k are connected by gold wires 7. Fig.11 Given Fig.10 Another variation of Fig.11 In the process, the gaskets T1 and T2 can also be made into an integral structure with the force-equalizing extension parts 4s and 4k respectively, so as to form a protruding structure on the surface of the force-equalizing extension parts 4s and 4k respectively, and the image sensor 2 and the circuit of the above-mentioned protruding structure are connected by CAF or welding to simplify the assembly process.

[0061] Fig.12 It showed Fig. 9 A variation of the invention is shown in which the force equalizing extensions 4v and 4t are arranged on the left and right sides of the connecting component 4, and the first connecting terminals of the flexible connecting strips 4a and 4b are arranged in parallel at the upper right corner and connected to the force equalizing extension 4t, the first connecting terminals of the flexible connecting strips 4c and 4d are arranged in parallel at the lower left corner and connected to the force equalizing extension 4v, and the connector 18 is connected to the force equalizing extension 4v. The force equalizing extensions 4t and 4v are connected to the image sensor 2. The distribution of the force equalizing extensions 4t and 4v on the left and right sides of the connecting component 4 is conducive to achieving force balance of the connecting component 4.

[0062] Fig.13 It showed Fig.12A variation of Fig.12 On the basis of the structure shown, an outer frame circuit board Q surrounding the connecting component 4 is added to limit the connecting component 4 and serve as a part of the fixed component. In addition, the force-equalizing extension portion 4t adds a lateral structure distributed on the upper and lower sides of the connecting component 4 to further make the connecting component 4 bear force evenly.

[0063] Fig.14 It showed Fig. 9 In another variation, the force equalizing extension portion 4b adds a lateral structure located on the upper side of the connecting component 4, and the force equalizing extension portion 4z adds a lateral structure located below the connecting component 4, so that the force distribution of the image sensor 2 and the connecting component 4 is more uniform.

[0064] In short, Figures 9 to 14 In the illustrated embodiment, the force balancing extension portions all extend in parallel with the outer contour of the connecting component 4 , which is beneficial for matching with the outer shape of the image sensor 2 and achieving balanced force on the image sensor 2 and the connecting component 4 .

[0065] Based on the same inventive concept, the present application embodiment further provides a flexible circuit board, which can refer to the structure of the connecting component 4 in the above embodiment, or, Figure 4 The connecting component 4 is an integrated structure with the first circuit board 10 and the second circuit board 8, or Figures 9 to 14 In the embodiment, the connecting component 4, the equalizing extension part and the structure of the outer frame circuit board, etc. For the related beneficial effects, please refer to its role in the camera module.

[0066] Based on the same inventive concept, the present application also provides a method for assembling a flexible circuit board. Figure 4 Taking the structure in the middle as the motherboard as an example, the method includes:

[0067] Providing the above motherboard;

[0068] Fold the connection component 4 to one side of the first circuit board 10;

[0069] Fold the second circuit board 8 to a side of the connecting component 4 away from the first circuit board 10;

[0070] Finally, the first circuit board 10 and the second circuit board 8 are arranged on opposite sides of the screw axis L1 of the connecting component 4 .

[0071] The above-mentioned assembly method directly utilizes a motherboard for folding, thereby eliminating the step of assembling, simplifying the process, and providing high stability of the integrated structure.

[0072] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A flexible circuit board, characterized in that: The invention comprises a connection assembly, wherein the connection assembly comprises a connection portion, and a plurality of flexible connection belts arranged at intervals around the connection portion, one end of each of the flexible connection belts is connected to the connection portion, and each of the flexible connection belts spirally extends in the same direction around the connection portion; Wherein, at least two of the flexible connecting strips are provided with a first connecting terminal at one end away from the connecting portion, and every two of the first connecting terminals are electrically connected; The flexible circuit board also includes a first circuit board, and the first circuit board and the connecting component are arranged in sequence along the spiral axis direction of the connecting component; one end of some of the at least two flexible connecting belts away from the connecting part is connected to the first circuit board.

2. The flexible circuit board according to claim 1, characterized in that: Each of the flexible connecting belts includes a plurality of segments connected in sequence, and each two adjacent segments are bent and connected to form a bent structure.

3. The flexible circuit board according to claim 2, characterized in that: Every two adjacent segments are vertically connected; the outer contour of the connecting component is roughly square.

4. The flexible circuit board according to claim 3, characterized in that: Each corner of the outer contour of the connecting assembly is provided with at least one of the first connecting terminals; An extension direction of each of the first connecting terminals is perpendicular to one of the side edges corresponding to the corner portion.

5. The flexible circuit board according to claim 4, characterized in that: At least two of the first connecting terminals are distributed on two opposite sides of the outer contour of the connecting component.

6. The flexible circuit board according to claim 5, characterized in that: The flexible circuit board also includes a second circuit board, and the first circuit board, the connecting component and the second circuit board are arranged in sequence along the spiral axis direction of the connecting component; The first connecting terminal on one side of the outer contour of the connecting component is connected to the corresponding edge of the first circuit board, and the first connecting terminal on the other side is connected to the corresponding edge of the second circuit board.

7. The flexible circuit board according to claim 3, characterized in that: Every at least two adjacent first connection terminals of the flexible connection strips are connected to form a second connection terminal.

8. The flexible circuit board according to claim 7, characterized in that: At least two of the second connecting terminals are symmetrical about the screw axis of the connecting assembly.

9. The flexible circuit board according to claim 3, characterized in that: At least one second hollow structure is provided in the middle of each connecting portion.

10. A flexible circuit board, characterized in that: The invention comprises a connection assembly, wherein the connection assembly comprises a connection portion, and a plurality of flexible connection belts arranged at intervals around the connection portion, one end of each of the flexible connection belts is connected to the connection portion, and each of the flexible connection belts spirally extends in the same direction around the connection portion; Wherein, at least two of the flexible connecting strips are provided with a first connecting terminal at one end away from the connecting portion, and every two of the first connecting terminals are electrically connected; The flexible circuit board also includes an outer frame circuit board, the middle part of the outer frame circuit board has a first hollow structure, the connecting component is located in the first hollow structure, and part of the first connecting terminals are connected to the inner side of the first hollow structure; The connecting assembly further comprises a force equalizing extension portion, the force equalizing extension portion extends along the direction of the outer contour of the connecting assembly, and the first connecting terminal of the flexible connecting belt is connected to the force equalizing extension portion.

11. The flexible circuit board according to claim 10, characterized in that: The first connecting terminals integrally connected to the inner side of the first hollow structure are distributed at two corners of the same diagonal line of the outer contour of the connecting component.

12. The flexible circuit board according to claim 10 or 11, characterized in that: The force equalizing extension portion is in the shape of a strip, and an extending direction of the force equalizing extension portion is parallel to an outer contour of the connecting assembly.

13. The flexible circuit board according to claim 10, characterized in that: Each of the flexible connecting belts includes a plurality of segments connected in sequence, and each two adjacent segments are bent and connected to form a bent structure.

14. The flexible circuit board according to claim 13, characterized in that: Every two adjacent segments are vertically connected; the outer contour of the connecting component is roughly square.

15. The flexible circuit board according to claim 12, characterized in that: Each corner of the outer contour of the connecting assembly is provided with at least one of the first connecting terminals; An extension direction of each of the first connecting terminals is perpendicular to one of the side edges corresponding to the corner portion.

16. The flexible circuit board according to claim 15, characterized in that: At least two of the first connecting terminals are distributed on two opposite sides of the outer contour of the connecting component.

17. The flexible circuit board according to claim 14, characterized in that: Every at least two adjacent first connection terminals of the flexible connection strips are connected to form a second connection terminal.

18. The flexible circuit board according to claim 17, characterized in that: At least two of the second connecting terminals are symmetrical about the screw axis of the connecting assembly.

19. The flexible circuit board according to claim 14, characterized in that: At least one second hollow structure is provided in the middle of each connecting portion.

20. A camera module, characterized in that: The camera module comprises: Fixing components; an image sensor; and, The flexible circuit board according to any one of claims 1 to 9, wherein the image sensor is located on a first circuit board included in the flexible circuit board; wherein a portion of the first connection terminals are connected to the fixed component, and another portion of the first connection terminals are connected to the first circuit board, so that the first circuit board is electrically connected to the fixed component and can move relative to the fixed component; or According to the flexible circuit board as claimed in any one of claims 10 to 19, the image sensor is located on a connecting component included in the flexible circuit board; wherein a portion of the first connecting terminals is connected to the outer frame circuit board, and another portion of the first connecting terminals is connected to the force-averaging extension portion of the connecting component, so that the image sensor is electrically connected to the outer frame circuit board and can move relative to the outer frame circuit board.

21. The camera module according to claim 20, characterized in that: When the flexible circuit board includes a second circuit board, the connector is connected to the second circuit board, and the image sensor is mounted on a surface of the first circuit board facing away from the second circuit board.

22. A method for assembling a flexible circuit board, characterized in that: include: A motherboard is provided, the motherboard comprising a first circuit board, a second circuit board and a connection assembly, the connection assembly comprising a connection portion, and a plurality of flexible connection belts spaced around the connection portion, one end of each of the flexible connection belts being connected to the connection portion, each of the flexible connection belts extending spirally in the same direction around the connection portion, the first circuit board and the second circuit board being arranged on both sides of the spiral axis of the connection assembly; wherein one end of a portion of the flexible connection belts away from the connection portion is connected to the first circuit board, and one end of another portion of the flexible connection belts away from the connection portion is connected to the second circuit board; Folding the connection assembly to one side of the first circuit board; The second circuit board is folded to a side of the connecting component away from the first circuit board.

Images