A flexible circuit board, a camera module and an electronic device

Abstract

The present invention relates to the field of imaging technologies, and discloses a flexible circuit board, a camera module and an electronic device. The flexible circuit board includes a connection assembly, and the connection assembly includes at least two first transfer parts and at least two second transfer parts that are alternately and spaced apart along a ring. Wherein, along the direction of the ring, a redundant connection part is connected between each adjacent first transfer part and second transfer part to form a closed-loop structure. When the above flexible circuit board is applied to a camera module, at least two first transfer parts are connected to a movable circuit board, and at least two second transfer parts are connected to a fixed circuit board; and along the direction of the ring, a redundant connection part is connected between each adjacent first transfer part and second transfer part, so that an active connection and an electrical connection are realized between each adjacent first transfer part and second transfer part. Thus, an active connection and an electrical connection between the movable circuit board and the fixed circuit board are realized, and the focusing speed is improved.

Description

Technical Field

[0001] The present invention relates to the field of imaging technologies, and particularly to a flexible circuit board, a camera module, and an electronic device. Background Art

[0002] In camera modules, anti-shake has become a standard function of current mobile phone lenses, and chip anti-shake (sensor shift) is even more widely used. Currently, the main way to implement this function is to set the chip on a movable circuit board. However, the movable circuit board carrying the image sensor is connected to the fixed circuit board through a flexible circuit board. The interference or hindrance of the flexible circuit board to the movement of the movable circuit board should meet the standards to ensure that the camera module can focus quickly.

[0003] Currently, it is difficult for flexible circuit boards to ensure a small resistance, resulting in a long response time for camera modules. Therefore, there is an urgent need to design a flexible circuit board that can solve the current problems. Summary of the Invention

[0004] The present invention discloses a flexible circuit board, a camera module, and an electronic device, which are used to reduce the resistance of the flexible circuit board and improve the focusing speed of the camera module.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, a flexible circuit board is provided. The flexible circuit board includes at least two first connection parts and at least two second connection parts that are alternately and spaced apart along a ring. Among them, along the direction of the ring, a redundant connection part is connected between each adjacent first connection part and the second connection part to form a closed-loop structure.

[0007] When the above flexible circuit board is applied to a camera module, at least two first connection parts are connected to the movable circuit board, and at least two second connection parts are connected to the fixed circuit board; and along the direction of the above ring, a redundant connection part is connected between each adjacent first connection part and the second connection part, enabling movable connection and electrical connection between each adjacent first connection part and the second connection part. Thus, movable connection and electrical connection between the movable circuit board and the fixed circuit board are realized, improving the focusing speed; at the same time, the flexible circuit board as a whole forms a closed-loop structure, which is beneficial to improving the structural stability of the flexible circuit board.

[0008] In a specific feasible implementation, the connection component includes two symmetrically arranged first connection parts and two symmetrically arranged second connection parts, and the symmetry axes of the two first connection parts are perpendicular to the symmetry axes of the second connection parts to facilitate the force balance of the connection component.

[0009] The specific forms of the redundant connection part can be various. In a specific possible implementation scheme, each of the redundant connection parts has a curved structure, and the concave side of the curved structure faces the center of the ring. The curved structure forms a redundant structure relative to the straight line shape, which can achieve active connection, increase the length of the redundant connection part, and reduce the deformation of each cross section of the redundant connection part when bending deformation occurs. Optionally, the curved structure is an angled structure. When the angle is a right angle, the outer contour of the connection component can be square to match the outer contour of the square image sensor. Alternatively, the curved structure is an arc-shaped structure so that the outer contour of the connection component is circular to match the inner contour of the circular shell of the camera module.

[0010] In another specific possible implementation, each of the redundant connection parts has a curved structure, and the concave side of the curved structure faces away from the center of the ring. In this way, the concave side of the curved structure can avoid some space for arranging components. Among them, optionally, the curved structure is an angled structure, and when the angle is a right angle, the outer contour of the connection assembly can be cross-shaped, which is convenient for avoiding other components on the concave side of the angled structure. Or, optionally, each of the redundant connection parts is an arc-shaped structure, which can also achieve the effect of avoiding other components on the concave side of the arc-shaped structure.

[0011] In a specific embodiment, a transition portion surrounded by the closed-loop structure is connected between the two first adapter portions, and the transition portion is used to connect to the movable circuit board, which is equivalent to increasing the connection area with the movable circuit board and improving the connection stability with the movable circuit board. At the same time, it also enables the two first adapter portions to be connected, thereby improving the stability of the connection between the two first adapter portions; wherein the shape of the transition portion is roughly a long strip; or, the transition portion is one of a circular, diamond, and cross shape, and along the symmetry axis direction of the two first adapter portions, the maximum width of the transition portion is greater than the maximum width of each of the first adapter portions, so as to further increase the contact area between the transition portion and the movable circuit board.

[0012] In a specific embodiment, the redundant connection part has a plurality of elongated hollow structures arranged side by side, and the hollow structures extend along the extension direction of the redundant connection part. The two first transition parts and the two second transition parts are respectively defined between adjacent ends of the hollow structures of adjacent redundant connection parts, so as to provide avoidance space for the deformation of the redundant connection part and improve the softness of the redundant connection part.

[0013] In a specific embodiment, the redundant connection portion includes a chamfer structure and two segments. The chamfer structure is located between the two segments, and the two segments are perpendicular to each other, so that the flexible circuit board is generally square as a whole and stress concentration can be avoided. Each segment has a plurality of strip-shaped hollow structures arranged side by side. The chamfer structure also has a plurality of strip-shaped hollow structures arranged side by side, and the two ends of the hollow structures at the chamfer structure are respectively adjacent to one end of the hollow structures at the two segments. While increasing the softness of the redundant connection portion, the structural stability can be ensured.

[0014] In a second aspect, a camera module is provided. The camera module includes a movable circuit board, a fixed circuit board, an image sensor disposed on the movable circuit board, and the flexible circuit board according to any one of the above technical solutions. Each of the first connection portions is connected to the movable circuit board, and each of the second connection portions is connected to the fixed circuit board, so that the movable circuit board can move in a direction parallel to the fixed circuit board and is electrically connected to the fixed circuit board.

[0015] The camera module has the same advantages as the above flexible circuit board over the prior art, and will not be described herein again.

[0016] In a specific embodiment, each of the first connection portions and the movable circuit board is an integral structure; and / or each of the second connection portions and the fixed circuit board is an integral structure. To improve the structural stability and simplify the process.

[0017] In a third aspect, an electronic device is provided. The electronic device includes the camera module provided by any one of the above technical solutions.

[0018] The electronic device has the same advantages as the above camera module over the prior art, and will not be described herein again. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of a camera module provided by an embodiment of the present application;

[0020] Figure 2 It shows a first schematic structural diagram of the flexible circuit board provided by an embodiment of the present application;

[0021] Figure 3 It shows a second schematic structural diagram of the flexible circuit board provided by an embodiment of the present application;

[0022] Figure 4a It shows a third schematic structural diagram of the flexible circuit board provided by an embodiment of the present application;

[0023] Figure 4bShows the fourth schematic diagram of the flexible circuit board provided by the embodiment of the present application;

[0024] Figure 5 Shows the fifth schematic diagram of the flexible circuit board provided by the embodiment of the present application;

[0025] Figure 6 Shows the sixth schematic diagram of the flexible circuit board provided by the embodiment of the present application;

[0026] Figure 7 Shows the seventh schematic diagram of the flexible circuit board provided by the embodiment of the present application;

[0027] Figure 8 Shows the eighth schematic diagram of the flexible circuit board provided by the embodiment of the present application;

[0028] Figure 9 Shows the ninth schematic diagram of the flexible circuit board provided by the embodiment of the present application;

[0029] Figure 10 Shows the schematic diagram of the cooperation of the movable circuit board, the fixed circuit board and the connection component in the camera module provided by the embodiment of the present application;

[0030] Figure 11 Shows Figure 10 The cross-sectional view of the first implementation manner at A-A in;

[0031] Figure 12 Shows Figure 10 The cross-sectional view of the second implementation manner at A-A in;

[0032] Figure 13 Shows Figure 10 The cross-sectional view of the third implementation manner at A-A in;

[0033] Figure 14 Shows Figure 10 The cross-sectional view of the fourth implementation manner at A-A in. Specific implementation manner

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. It should be noted that the filling in the following embodiments Figures 2 to 10 does not represent a cross-section, but only represents the solid structure for easy distinction from the hollow structure.

[0035] To facilitate the understanding of the flexible circuit board provided by the embodiments of the present application, its application scenario will be described first. Figure 1 The schematic diagram of the flexible circuit board shown when it is applied to a camera module is referred to Figure 1 , the flexible circuit board includes a connection component 13. The camera module 01 includes an image sensor 11, a fixed circuit board 5, a movable circuit board 12, and the above-mentioned connection component 13. The fixed circuit board 5 has a receiving hollow structure U, and the connection component 13 is located within the receiving hollow structure U. The movable circuit board 12 is disposed opposite to the receiving hollow structure U and is substantially parallel to the fixed circuit board 5. A flexible connection and an electrical connection are achieved between the movable circuit board 12 and the fixed circuit board 5. The image sensor 11 is disposed on the surface of the movable circuit board 12 and is electrically connected to the movable circuit board 12 by means of a gold wire 7 or the like. Components 10 such as capacitors and inductors may be provided on the movable circuit board 12.

[0036] The flexible circuit board will be further described below.

[0037] The connection component 13 in the flexible circuit board provided by the embodiments of the present application includes: at least two first transfer portions 132 and at least two second transfer portions 134 that are alternately and spaced apart along the trajectory of the ring Q. Among them, along the circumferential direction of the ring, a redundant connection portion 131 is connected between each adjacent first transfer portion 132 and second transfer portion 134. The meaning of the above "alternately and spaced apart distribution" is that a second transfer portion 134 is provided between every two first transfer portions 132, and a first transfer portion 132 is provided between every two second transfer portions 134 to form a closed-loop structure. The meaning of the "redundant connection portion" is: a structure having an additional curved extension trajectory relative to a straight structure, so that the structures at both ends of the redundant connection portion can achieve a movable connection. Among them, the above "ring" can be a circular ring, a square ring, or other rings with a closed structure.

[0038] When the above flexible circuit board is applied to a camera module, at least two first transfer portions 132 are connected to the movable circuit board, and at least two second transfer portions 134 are connected to the fixed circuit board; and along the circumferential direction of the above ring, a redundant connection portion 131 is connected between each adjacent first transfer portion 132 and second transfer portion 134, so that a movable connection and an electrical connection are achieved between each adjacent first transfer portion 132 and second transfer portion 134. Thus, a movable connection and an electrical connection between the movable circuit board and the fixed circuit board are achieved, and the focusing speed is improved; at the same time, the flexible circuit board as a whole forms a closed-loop structure, which is beneficial to improving the structural stability of the flexible circuit board.

[0039] Refer to Figure 2, the connecting component 13 includes two first adapter parts 132 and two second adapter parts 134. Among them, the two first adapter parts 132 are symmetrically arranged, and the two second adapter parts 134 are symmetrically arranged; and the symmetry axis of the two first adapter parts 132 is perpendicular to the symmetry axis of the two second adapter parts 134. In this way, the connecting component 13 can achieve a better force balance state only by using the relatively few two first adapter parts 132 and two second adapter parts 134. However, it should be understood that the connecting component 13 including two first adapter parts 132 and two second adapter parts 134 is only exemplary and is not limited to the above quantity ratio. When the connecting component 13 includes at least two first adapter parts 132 and at least two second adapter parts 134, for example, it includes three first adapter parts 132 and three second adapter parts 134, or four first adapter parts 132 and four second adapter parts 134, etc.

[0040] There can be multiple ways to form the redundant connecting part 131. Each redundant connecting part 131 has a bending structure. The so-called "bending structure" here refers to a structure that is recessed in the same direction and has a sudden change in the folding angle or a gradual arc in the extending track. The concave side of the bending structure faces the center of the ring Q. Specifically, in Figure 2In it, each redundant connection part 131 has an angled structure so that the outer contour of the connection component 13 is square. The above-mentioned "angled structure" includes segments 131a and 131b that are vertically connected (here, the vertical connection is only an embodiment and engineering errors are allowed). Among them, segment 131a is connected to the first adapter part 132, and segment 131b is connected to the second adapter part 134. And a chamfer structure 131c is located between segment 131a and segment 131b so that the connection between segment 131a and segment 131b can be connected through the chamfer structure 131c to avoid excessive stress concentration at the connection between segment 131a and segment 131b. The chamfer structure 131c is triangular, and the two adjacent sides are respectively connected to segment 131a and segment 131b. Among them, segment 131a has a plurality of strip-shaped hollow structures arranged side by side and extending along the extension direction of segment 131a (see reference numeral U1), segment 131b has a plurality of strip-shaped hollow structures arranged side by side and extending along the extension direction of segment 131b (see reference numeral U2), and the triangular chamfer structure 131c has a plurality of strip-shaped hollow structures arranged side by side (see reference numeral U3). The hollow structures U1, U2, and U3 correspond to each other one by one. The two ends of the hollow structure U3 are respectively adjacent to one end of the corresponding hollow structure U1 and one end corresponding to U3, but they are not connected to each other. That is, a reinforcing rib K1 is formed between segment 131a and the chamfer structure 131c to separate the hollow structures U1 and U2, and a reinforcing rib K2 is formed between segment 131a and the chamfer structure 131c to separate the hollow structures U2 and U3 to prevent the respective strip-shaped structures separated by the hollow structures U1, U2, and U3 from becoming loose and enhance the structural stability. The outer contour of the image sensor 11 is generally square and can be well matched with the square outer contour of the connection component 13. So that the flexible circuit board 12 has a certain degree of freedom in a plane perpendicular to the optical axis. To Figure 2 Taking the first adapter part 132 on the upper side as an example, the first adapter part 132 is defined between the adjacent ends of the hollow structures U1 in the redundant connection parts 131 on the left and right sides. Another first adapter part 132 and two second adapter parts 134 are defined in a similar manner.

[0041] And in Figure 3 each redundant connection part 131 can also have an arc-shaped structure so that the outer contour of the connection component 13 is circular, so as to be well matched with the inner contour of the circular housing of the camera module and make full use of the space inside the housing.

[0042] Alternatively, each redundant connection portion 131 has a bending structure, and the concave side of the bending structure faces away from the center of the ring, so as to facilitate accommodating the transition portion 133 within the space enclosed by the closed-loop structure. The closed-loop structure surrounds the transition portion 133, increasing the connection area with the flexible circuit board. Alternatively, components can be accommodated within the space enclosed by the closed-loop structure. Among them, reference Figure 4a and Figure 4b , the above-mentioned bending structure can be a folding angle structure, and the convex sides of the respective folding angle structures face each other. The meaning of this folding angle structure can be referred to Figure 2 the definition of the folding angle structure in the corresponding embodiment. When the folding angle is a right angle, the outer contour of the connection assembly 13 is in a cross shape. The concave side of the folding angle structure can accommodate some components. It should be understood that this cross-shaped structure is still a closed-loop structure; it is also possible to movably connect the flexible circuit board 12 in the XY direction perpendicular to the optical axis. Among them, Figure 4b and Figure 4a differ in that extension portions a1 and a2 are added to the left and right sides of the first adapter portion 132 to increase the connection area with the flexible circuit board 12 and improve stability.

[0043] Or as Figure 5 , the bending structure can also be an arc structure, and the convex side of the arc faces the center of the ring Q. Thus, some other components can be accommodated on the concave side of this arc structure, and the redundant connection portion 131 can also have a good movable connection function.

[0044] In Figure 2 , Figure 3 , and Figures 6 to 9 , a transition portion 133 is connected between the two first adapter portions 132, and the distance between the two first adapter portions 132 is limited by the transition portion 133, which can improve the connection stability between the two first adapter portions 132. At the same time, the transition portion 133 is also used to connect with the flexible circuit board 12. Thus, the overall contact area between the connection assembly 13 and the flexible circuit board 12 can be increased, and the connection stability with the flexible circuit board 12 can be improved. Among them, in Figure 2 , the outer contour of the transition portion 133 is adapted to the square inner contour of the closed area surrounded by the redundant connection portion 131, the two first adapter portions 132, and the two first adapter portions 134 to make full use of the area within this closed area to increase the area of the transition portion 133. And Figure 6 and Figure 7 show two deformed structures of Figure 2 , in Figure 6Among them, the transition part 133 is rectangular, but this rectangle is only exemplary and certain deformations are allowed. For example, small protrusions are provided at the edges of the rectangle. As long as it is generally strip-shaped, both ends of the linear structure are respectively connected to the two first transition parts 132, so that the distance between the two first transition parts 132 can be limited by using the transition part 133 with a small area, achieving the effect of weight reduction. At the same time, space can be left on both the left and right sides of the transition part 133 to arrange some components. Or, as Figure 7 , the transition part 133 has a "cross-shaped" structure. Both ends of the vertical part in this cross-shaped structure are respectively connected to the two first transition parts 134. Since the cross-shaped structure can take into account the forces on the movable circuit board 12 in the two XY dimensions perpendicular to the optical axis, it can provide more stable and balanced support for the movable circuit board 12, and it provides stable support for the movable circuit board at the four important support point positions of up, down, left, and right. In Figure 3 Among them, the outer contour of the transition part 133 is circular, so as to adapt to the circular inner contour of the closed area surrounded by the redundant connection part 131, the two first transition parts 132, and the two first transition parts 134, making full use of the area of the above-mentioned closed area, increasing the area for connecting with the movable circuit board 12, and improving stability. Figure 8 And Figure 9 show Figure 3 the deformation of the structure shown. In Figure 8 Among them, the circular transition part 133 is replaced with a structure that is generally diamond-shaped, which can achieve the effect of weight reduction to a certain extent, and at the same time can provide stable support for the movable circuit board at the four positions of up, down, left, and right. While in Figure 9 Among them, the circular transition part 133 is replaced with a structure that is generally hexagonal, which is equivalent to cutting off the Figure 8 corner parts on the left and right sides of the transition part 133 in Figure 8 And Figure 9 The transition parts in are all centrosymmetric figures, and can better balance the force on the movable circuit board 12 when connecting with the movable circuit board 12. When the transition part is one of circular, diamond-shaped, cross-shaped, etc., along the symmetry axis direction of the two first transition parts 132, the maximum width of the transition part 133 is greater than the maximum width of each first transition part 132, so as to increase the contact area between the transition part 133 and the movable circuit board 12.

[0045] Based on the same inventive concept, an embodiment of the present application further provides an imaging module, which includes a flexible circuit board, a movable circuit board 12, a fixed circuit board 5, and an image sensor; each first connection portion 132 is connected to the movable circuit board, and each second connection portion 134 is connected to the fixed circuit board 5, so that the movable circuit board 12 can move along a direction parallel to the fixed circuit board 5 and is electrically connected to the fixed circuit board 2.

[0046] A possible structure of the imaging module can be referred to Figure 1 , and, in addition to the description of Figure 1 above, Figure 1 the imaging module 01 shown also includes a reinforcement plate 6, which is located on the bottom side of the fixed circuit board 5 and seals the hollow structure U. The reinforcement plate 6 has the functions of reinforcement and sealing. A lens 1 is provided on the light-emitting side of the image sensor 11, and an infrared filter film 8 is provided between the lens 1 and the imaging surface of the image sensor 11. The infrared filter film 8 is used to filter infrared rays in the ambient light to avoid affecting imaging. The infrared filter film 8 is mounted on the movable circuit board 12 through a first bracket 9. An autofocus motor 1 is connected around the lens 1 to achieve autofocus. An OIS motor 4 is provided between the autofocus motor 1 and the first bracket 9 to achieve adjustment of the lens 1 in the direction perpendicular to the optical axis. The lens 1 is fixed to the fixed circuit board 5 through a second bracket 3. The connector 14 is electrically connected to the fixed circuit board 5 for easy connection to the main board.

[0047] However, the specific structure of the imaging module is not limited to Figure 1 the specific form in, for example, the fixed circuit board 5 and the movable circuit board 12 can be arranged in parallel, rather than the movable circuit board 12 being arranged in the hollow structure U of the fixed circuit board 5, and the movable connection between the movable circuit board 12 and the fixed circuit board 5 in the direction perpendicular to the optical axis can also be achieved. The imaging module has an effect similar to that of the flexible circuit board in the foregoing embodiment and will not be elaborated herein.

[0048] In addition, each first connection portion 132 and the movable circuit board are of an integral structure; and / or each second connection portion 134 and the fixed circuit board are of an integral structure. Figure 10 shows a schematic diagram of the connection and cooperation between the connection component 13 and the fixed circuit board 5 and the movable circuit board 12 in the imaging module provided by the embodiment of the present application. In order to clearly show the components below the movable circuit board 12, the outer contour of the movable circuit board 12 is represented by a dotted line. Figure 11 shows Figure 10 the first possible cross-sectional view at A-A in Figure 11In [the situation], the first transfer part 132 and the flexible circuit board 12 are connected and electrically conductive through bonding with ACF adhesive or soldering, etc., and the second transfer part 134 and the fixed circuit board 5 are electrically conductive through bonding with ACF adhesive or soldering, etc. However, this is only an example. Figure 12 shows Figure 10 the second possible cross-sectional view at A-A in Figure 12 In [the situation], the first transfer part 132 and the flexible circuit board 12 are of an integrally formed structure, which can be directly formed by patterning a flexible circuit board to simplify the manufacturing process and improve stability. The second transfer part 134 and the fixed circuit board 5 are electrically conductive through bonding with ACF adhesive or soldering, etc. Figure 13 shows Figure 10 the third possible cross-sectional view at A-A in Figure 13 In [the situation], the first transfer part 132 and the flexible circuit board 12 are electrically conductive through bonding with ACF adhesive or soldering, etc. The second transfer part 134 and the fixed circuit board 5 are of an integrally formed structure, which can be directly formed by patterning a flexible circuit board to simplify the manufacturing process and improve stability. Figure 14 shows Figure 10 the fourth possible cross-sectional view at A-A in [the situation]. The first transfer part 132 and the flexible circuit board 12, and the second transfer part 134 and the fixed circuit board 5 are of an integrally formed structure, which can be directly formed by patterning a flexible circuit board to simplify the manufacturing process and improve stability.

[0049] Based on the same inventive concept, the embodiment of the present application further provides an electronic device, which can be a device with an imaging function such as a mobile phone and a tablet, and specifically includes the camera module provided in the foregoing embodiment. Its specific advantages can be referred to the description of the camera module.

[0050] 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 equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A flexible circuit board, characterized in that, Applied to a camera module, the camera module includes a flexible circuit board and a fixed circuit board, and the flexible circuit board includes a connection component, and the connection component includes: At least two first transfer parts and at least two second transfer parts that are alternately and spaced apart along a ring. Among them, along the direction of the ring, a redundant connection part is connected between each adjacent first transfer part and the second transfer part to form a closed-loop structure; The first transfer part is configured to be electrically connected to the flexible circuit board, and the second transfer part is configured to be electrically connected to the fixed circuit board; The redundant connection part has a plurality of strip-shaped hollow structures arranged side by side, and the hollow structures extend along the extension direction of the redundant connection part. The adjacent ends of the hollow structures of adjacent redundant connection parts respectively define the two first transfer parts and the two second transfer parts, and the adjacent first transfer part and the second transfer part are movably and electrically connected through the redundant connection part.

2. The flexible circuit board according to claim 1, wherein, The connection component includes two symmetrically arranged first transfer parts and two symmetrically arranged second transfer parts, and the symmetry axes of the two first transfer parts are perpendicular to the symmetry axes of the second transfer parts.

3. The flexible circuit board according to claim 1, wherein Each redundant connection part has a bending structure, and the concave side of the bending structure faces the center of the ring.

4. The flexible circuit board according to claim 3, wherein The bending structure is a folding angle structure or an arc structure.

5. The flexible circuit board according to claim 2, wherein Each redundant connection part has a bending structure, and the concave side of the bending structure faces away from the center of the ring.

6. The flexible circuit board according to claim 5, wherein Each redundant connection part is in a folding angle structure or an arc structure.

7. The flexible circuit board according to claim 3, wherein A transition part surrounded by the closed-loop structure is connected between the two first transfer parts, and the shape of the transition part is generally strip-shaped; or The transition part is one of a circle, a rhombus, and a cross, and along the symmetry axis direction of the two first transfer parts, the maximum width of the transition part is greater than the maximum width of each first transfer part.

8. The flexible circuit board according to claim 1, characterized in that The redundant connection part includes a chamfer structure and two segments. The chamfer structure is located between the two segments, and the two segments are perpendicular to each other. Each segment has a plurality of strip-shaped hollow structures arranged side by side. The chamfer structure also has a plurality of strip-shaped hollow structures arranged side by side, and the two ends of the hollow structure at the chamfer structure are respectively adjacent to one end of the hollow structures at the two segments.

9. An imaging module, characterized in that, The camera module includes a flexible circuit board, a fixed circuit board, an image sensor disposed on the flexible circuit board, and the flexible circuit board according to any one of claims 1 to 8; wherein, Each first transfer part is connected to the flexible circuit board, and each second transfer part is connected to the fixed circuit board, so that the flexible circuit board can move along a direction parallel to the fixed circuit board and is electrically connected to the fixed circuit board.

10. The imaging module according to claim 9, wherein Each first transfer part and the flexible circuit board are of an integral structure; and / or, Each second transfer part and the fixed circuit board are of an integral structure.

11. An electronic device, characterized in that, Including the camera module according to claim 9 or 10.

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