CN112969296A

CN112969296A - Flexible circuit board, camera module and assembly method of flexible circuit board

Info

Publication number: CN112969296A
Application number: CN202110328520.5A
Authority: CN
Inventors: 马忠科; 陈小凤
Original assignee: Nanchang OFilm Optoelectronics Technology Co Ltd
Current assignee: Nanchang OFilm Tech Co Ltd; Nanchang OFilm Optoelectronics Technology Co Ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2021-06-15

Abstract

The invention relates to the technical field of imaging devices and discloses a flexible circuit board, a camera module and an assembly method of the flexible circuit board, wherein the flexible circuit board comprises a connecting assembly, the connecting assembly comprises a connecting part and a plurality of flexible connecting bands arranged at intervals around the connecting part, and each flexible connecting band spirally extends around the connecting part in the same direction; wherein, the one end that connecting portion were kept away from to two at least flexible connecting bands is equipped with first connection terminal, and per two electricity is connected between the first connection terminal. Because the connecting assembly comprises a plurality of flexible connecting belts, only small material stress needs to be overcome when the connecting assembly is bent; the flexible connecting band extends spirally, has a certain redundancy, and only needs to overcome smaller resistance when being stretched.

Description

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

Technical Field

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

Background

The image capturing module generally includes a lens group and an image sensor, the lens group is located on an image plane side of the image sensor, and light entering from the lens group reaches the image plane of the image sensor to form an image on the image plane.

The image sensor is installed on the movable circuit board, the movable circuit board transversely (perpendicular to the optical axis) moves relative to the fixed circuit board, the movable circuit board and the transverse circuit board are connected through the flexible board, the width of the flexible board is designed to be large in order to ensure the sufficient wiring width, certain resistance can be brought when the movable circuit board transversely moves due to the material characteristics of the flexible board, and the focusing speed is influenced.

Disclosure of Invention

The invention discloses a camera module which is used for improving the flexibility of a connecting assembly, reducing the resistance in focusing and improving the focusing speed.

In order to achieve the purpose, the invention provides the following technical scheme:

in a first aspect, a flexible circuit board is provided, which is applied to a camera module, and comprises a connecting assembly, wherein the connecting assembly comprises a connecting part and a plurality of flexible connecting bands arranged around the connecting part at intervals, and each flexible connecting band spirally extends around the connecting part in the same direction; at least two ends, far away from the connecting part, of the flexible connecting bands are provided with first connecting terminals, and every two first connecting terminals are electrically connected.

In the flexible circuit board, when one part of the first connecting terminals is connected with the circuit board for bearing the image sensor and the other part of the first connecting terminals is connected with a connector and the like relative to a shell fixing part of the camera module, the image sensor can move relative to the fixing part and can be electrically connected with the connector; the connecting assembly comprises a plurality of flexible connecting belts, the flexible connecting belts are in a belt shape under the condition of ensuring that the wiring amount is not changed, and only small material stress needs to be overcome during bending; and the flexible connecting band extends spirally, and has a certain redundancy relative to a linear strip structure, and only needs to overcome smaller resistance when being stretched. Therefore, at the time of focusing of the image sensor, the resistance to movement of the image sensor is reduced.

The flexible connecting band can be extended in a spiral mode in various ways, in a specific implementation scheme, each flexible connecting band comprises a plurality of subsections which are connected in sequence, every two adjacent subsections are connected in a bending mode and form a bending structure, the bending structure formed by bending connection forms a spiral structure with certain redundancy, and resistance which needs to be overcome when the flexible connecting band deforms is reduced.

The included angles between the adjacent segments can be in various forms so as to form connecting components in different shapes respectively; in a specific embodiment, every two adjacent segments are vertically connected; the outer contour of the connecting assembly is substantially square to accommodate a square image sensor chip.

In a specific embodiment, the flexible circuit board further includes an outer frame circuit board, a first hollow structure is disposed in the middle of the outer frame circuit board, the connecting assembly is located in the first hollow structure, and a part of the first connecting terminal is integrally connected with an inner side edge of the first hollow structure. Frame circuit board holds coupling assembling through setting up first hollow out construction, can reduce the whole thickness of the module of making a video recording in the optical axis direction, can be used for bearing fixed part, realizes switching on of coupling assembling and external circuit.

In a specific embodiment, the first connecting terminals integrally connected with the inner side edge of the first hollow structure are distributed at two corners of the same diagonal line of the outer contour of the connecting component, so that the stress balance of the connecting component is realized at two stress points.

Optionally, the connecting assembly further comprises a strip-shaped uniform force extension part, and the uniform force extension part extends along a direction parallel to the outer contour of the connecting assembly; the first connecting terminal of the flexible connecting band is connected with the force-equalizing extension part; so as to be connected with the movable circuit board through the force-equalizing extension part, and the stress of the connecting component in each direction is uniform.

In a particular embodiment, the first connection terminal is provided by providing at least one first connection terminal at each corner of the outer contour of the connection assembly; the extending direction of each first connecting terminal is perpendicular to one side edge corresponding to the corner; to achieve balancing of the connection assembly at four points of force.

In a particular embodiment, at least two of the first connection terminals are distributed on two opposite sides of the outer contour of the connection assembly, so as to realize a "Z" connection between the fixed part and the movable circuit board respectively connected on two opposite sides of the connection assembly.

In a specific embodiment, the flexible circuit board further comprises a first circuit board and a second circuit board, and the first circuit board, the connecting component and the second circuit board are sequentially arranged along the direction of the spiral axis of the connecting component; the first connecting terminal on one side of the outer contour of the connecting component is connected with the corresponding edge of the first circuit board, and the first connecting terminal on the other side of the outer contour of the connecting component is connected with the corresponding edge of the second circuit board; the first circuit board is used as a movable circuit board, the second circuit board is used as a fixed part, and the first circuit board and the second circuit board are flexibly connected through a connecting component; so that the spiral structure of the connecting component is formed by patterning a whole motherboard and then folded into a Z-shaped structure, and the preparation process is simplified.

Optionally, every two adjacent first connecting terminals of the flexible connecting belt are connected to form a second connecting terminal, and the area of the second connecting terminal is increased compared with that of the first connecting terminal, so that the stability of connection is improved.

Optionally, at least two second connecting terminals are axisymmetrical with respect to a spiral shaft of the connecting assembly, so that the stress uniformity is improved.

Optionally, at least one second hollow structure is arranged in the middle of each connecting part, so that the flexibility of the connecting component is further improved, and the deformation resistance is reduced.

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

In the camera module, the first circuit board can carry the image sensor to move relative to the fixed component and realize the electrical connection with the fixed component; the connecting assembly comprises a plurality of flexible connecting belts, the flexible connecting belts are in a belt shape under the condition of ensuring that the wiring amount is not changed, and only small material stress needs to be overcome during bending; and the flexible connecting band extends spirally, and has a certain redundancy relative to a linear strip structure, and only needs to overcome smaller resistance when being stretched. Therefore, the resistance to movement of the image sensor is reduced during focusing and anti-shake of the image sensor.

In a third aspect, another camera module is provided, where the camera module includes a connector, an image sensor, and the flexible circuit board provided in the eighth technical solution; the connector is connected with the second circuit board, and the image sensor is mounted on the surface of the first circuit board, which is far away from the second circuit board.

In the camera module, the first circuit board can carry the image sensor to move relative to the second circuit board and realize the electrical connection with the second circuit board; the connecting assembly comprises a plurality of flexible connecting belts, the flexible connecting belts are in a belt shape under the condition of ensuring that the wiring amount is not changed, and only small material stress needs to be overcome during bending; and the flexible connecting band extends spirally, and has a certain redundancy relative to a linear strip structure, and only needs to overcome smaller resistance when being stretched. Therefore, the resistance to movement of the image sensor is reduced during focusing and anti-shake of the image sensor.

In a fourth aspect, there is provided a method of assembling a flexible circuit board, the method comprising: providing a motherboard, wherein the motherboard comprises a first circuit board, a second circuit board and a connecting assembly, the connecting assembly comprises a connecting part and a plurality of flexible connecting belts arranged at intervals around the connecting part, each flexible connecting belt spirally extends around the connecting part in the same direction, and the first circuit board and the second circuit board are respectively arranged at two sides of the spiral axis of the connecting assembly; one end of one part of the flexible connecting band, which is far away from the connecting part, is connected with the first circuit board, and the other end of the other part of the flexible connecting band, which is far away from the connecting part, is connected with the second circuit board; folding the connection assembly to one side of the first circuit board; folding the second circuit board to a side of the connection assembly away from the first circuit board.

Through the assembling method, a whole mother board with the connecting assembly is directly used for twice folding, so that a Z-shaped folding structure can be obtained, the first circuit board, the second circuit board and the connecting assembly are not required to be assembled and combined, the assembling method is simple and rapid, the preparation process is simple, and the stability is good due to the integral connection.

Drawings

Fig. 1 is a cross-sectional view of a camera module according to an embodiment of the present disclosure;

FIG. 2 shows a first structural view of the connecting assembly of FIG. 1;

FIG. 3 is a schematic view of the second circuit board, first circuit board and connector assembly of FIG. 1 mated together;

FIG. 4 is an expanded view of the second circuit board, the first circuit board and the connecting assembly of FIG. 1 in a unitary construction;

FIG. 5 shows a second structural view of the connecting assembly of FIG. 1;

FIG. 6 shows a third structural view of the connecting assembly of FIG. 1;

FIG. 7 shows a fourth structural view of the connecting assembly of FIG. 1;

FIG. 8 shows a fifth construction of the connection assembly of FIG. 1;

fig. 9 is a schematic structural diagram illustrating a flexible circuit board in the camera module according to the embodiment of the present disclosure;

FIG. 10 is a schematic diagram of the structure of the flexible circuit board of FIG. 9 mated with the image sensor via the spacer;

FIG. 11 is a schematic diagram showing the structure of the flexible printed circuit board of FIG. 9 when it is mated with the image sensor by forming a bump structure on the surface of the force equalizing extension;

FIG. 12 illustrates a first alternative configuration of the flexible circuit board of FIG. 9;

FIG. 13 illustrates a further deformed configuration of the flexible circuit board shown in FIG. 12;

fig. 14 shows a second modified structure of the flexible circuit board shown in fig. 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Specifically, referring to fig. 1, the embodiment of the present application provides a camera module 100, in which a second circuit board 8 is disposed in parallel with a first circuit board 10, where "parallel" allows an engineering error, and an orthographic projection of the first circuit board 10 on the second circuit board 8 is located in a middle portion of the second circuit board 8. The image sensor 2 is bonded on the surface of the first circuit board 10 far away from the second circuit board 8 through glue 1, the image sensor 2 is connected with the first circuit board 10 through a gold wire 7, and electronic devices 17 such as a capacitor, an inductor and the like can be further arranged on the first circuit board 10; the first circuit board 10 may also function as a reinforcement and as a module seal. A groove-shaped first support 12 is buckled on the second circuit board 8 in an inverted mode, the vertical part of the first support 12 extends along the edge of the second circuit board 8, a groove-shaped second support 11 is buckled on the first circuit board 10 in an inverted mode, the vertical part of the second support 11 extends along the edge of the first circuit board 11, an opening is formed in the position, opposite to the first circuit board 10, of the first support 12, an opening is formed in the position, opposite to the image sensor 2, of the second support 11, and an infrared cut-off filter 13 is arranged at the opening of the second support 11; and the second support 11 extends to the position opposite to the first support 12 towards the inner side, the second support 11 is connected with the first support 12 through a suspension structure 16, the suspension structure 16 mainly plays a supporting role, and besides the suspension structure, other supporting structures with supporting functions such as a spring plate, a silicon chip, a thin film and the like can be adopted. The edge of the second circuit board 8 is provided with a magnet 5, the magnet 5 is positioned inside the first bracket 12, the edge of the first circuit board 10 is provided with a coil 6, and the coil 6 is positioned inside the second bracket 11. The magnet 5 is used as a first driving member, the coil 6 constitutes a second driving member, the first driving member and the second driving member together constitute a driving assembly, and the first circuit board 10 is driven to move relative to the first circuit board 8 along a direction parallel to a reference plane by a magnetic force between the magnet 5 and the energized coil 6, wherein the reference plane can be a plane where a surface of the second circuit board 8 facing the reinforcing plate 9 is located. The positions of the magnet 5 and the coil 6 can be interchanged, and other magnetic first driving parts can be used for driving the second driving part to transversely move by magnetic force. The drive assembly may be in the form of SMA, Piezo and OIS motors or the like, in addition to coils and magnets.

The voice coil motor 14 is arranged above the first support 12, a lens group 15 is arranged on the inner side of the voice coil motor 14, the lens group 15 on the voice coil motor 14 in the optical axis direction is far away from or close to the image sensor 2 to adjust the image distance, the voice coil motor 14 can also be other driving devices with a longitudinal driving function, the lens group 15, the infrared cut-off filter 13 and the image sensor 2 are sequentially arranged in the optical axis direction, and light rays sequentially pass through the infrared cut-off filter 13 and the image sensor 2 after entering from the lens group 15. The infrared cut filter 13 can filter out infrared interference in the environment.

In order to realize the 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 through the connecting component 4 to bear the routing between the two circuit boards; the connecting assembly 4 is located between the second Circuit board 8 and the first Circuit board 10, and the connecting assembly 4 may be formed by patterning a Flexible Printed Circuit (FPC). Compared with the method that the first circuit board 10 is placed in the hollow-out of the second circuit board 8, and the connecting component is arranged between the second circuit board 8 and the side edge of the first circuit board 10, the occupied area can be saved when the second circuit board 8 is placed on the plane.

Fig. 2 shows one possible configuration of the connecting assembly 4, and with reference to fig. 2, the connecting assembly 4 comprises a connecting portion 4k in the middle, and flexible connecting strips (4a, 4b, 4c and 4 d). Wherein the connecting portion 4k is illustratively square; taking the flexible connecting belt 4a as an example, the extending mode thereof will be described: the flexible connection belt 4a includes a plurality of segments vertically connected in sequence, a first segment is connected to the right side (one end in the positive x-axis direction) of the connection part 4k, then, the first segment extends clockwise spirally with a perpendicular line L1 passing through the geometric center of the connection part 4k as a spiral axis and extends downward (in the negative y-axis direction), a second segment extends leftward (in the negative x-axis direction), a third segment extends upward (in the positive y-axis direction), … …, and so on, the segments of the flexible connection belt 4a are vertically connected in sequence in the clockwise direction to form a spiral structure, the outermost circle of the flexible connection belt 4a extends from the upper side in the positive x-axis direction, the end of the outermost circle protrudes toward the positive x-axis direction by a section relative to the outer contour R of the connection assembly, and the protruding section is called as a first connection terminal 5a of the. Every two adjacent segments in the flexible connection band 4a are vertically connected, and a bending structure is formed between every two adjacent segments, the number of the bending structures is between 2 and 8, so as to take account of the width of the flexible connection band a and the size of the image sensor 2, for example, the segment z1 is vertically connected with the segment z2, and the same connection mode is also adopted between the other adjacent segments, which is beneficial to forming a structure with an approximately square outer contour R, is convenient to match with the shapes of the second circuit board 8 and the first circuit board 10, and is also convenient to match with the shape of the square image sensor 2. However, it should be noted that the perpendicular connection between two adjacent segments of the flexible connecting band 4a is only exemplary, and each two adjacent segments may be connected by bending at other angles to form connecting assemblies with different profile shapes to adapt to image sensors with different shapes; in addition, the flexible connecting band can also extend spirally along the arc-shaped track, and the effect of reducing the material stress required to be overcome during deformation can also be achieved.

Similarly, one end of the flexible connection band 4b is connected to the lower side of the connection portion 4k, extending in a clockwise spiral, and the outermost turn of the flexible connection band 4b is located at the rightmost side thereof and protrudes at the lower end thereof to the right by a length, forming the first connection terminal 5 b.

One end of the flexible connecting band 4c is connected to the left side of the connecting portion 4k and extends in a clockwise spiral manner, the outermost turn of the flexible connecting band 4b is located at the lowermost side thereof and extends leftward, and the end thereof protrudes and extends leftward by one step to form a first connecting terminal 5 c.

One end of the flexible connecting band 4d is connected with the upper side of the connecting part 4k and extends along a clockwise spiral, the outermost circle of the flexible connecting band 4d is positioned at the leftmost side and extends upwards, and the uppermost end of the flexible connecting band protrudes and extends towards the left side for a section to form a first connecting terminal 5 d.

Wherein, the outer contour R of the connecting component formed along the side edge of the outermost ring of the flexible connecting bands (4a, 4b, 4c and 4d) is approximately square, which is beneficial to matching with a square image sensor. In the following, reference is made to the definition of the corresponding concept in fig. 2 with respect to the outer contour of the connection assembly and the first terminal of each flexible connection strip. And every two first connection terminals are electrically connected, for example, the first connection terminal 5a and the first connection terminal 5d are electrically connected through a wire, and the first connection terminal 5b and the first connection terminal 5c are electrically connected through a wire.

In fig. 2, first connection terminals (5a, 5b, 5c, and 5d) are respectively provided at four corners of the outer contour of the connecting member 4, wherein the

first connection terminals

5a and 5b extend perpendicularly to a right side of the outer contour of the connecting member 4, and the

first connection terminals

5c and 5d extend perpendicularly to a left side of the outer contour of the connecting member 4.

Wherein the flexible connecting strips (4a, 4b, 4c and 4d) are kept at a distance from each other to avoid mutual interference when deformed.

In fig. 2, the connecting assembly 4 comprises 4 flexible connecting strips, such as 4a, 4b, 4c and 4d, but this is merely exemplary, as long as a plurality is included, and specifically may be at least two flexible connecting strips, more specifically such as 5, 6 or even more. As long as one part of the flexible connecting band is connected with the second circuit board at the end far away from the connecting part, and the other part of the flexible connecting band is connected with the first circuit board at the end far away from the connecting part. Moreover, each flexible connecting band is not limited to extend along a clockwise spiral, but can also extend along a counterclockwise spiral. The first connecting terminals of the two parts are conducted through a line, and finally the first circuit board is conducted with the second circuit board.

Fig. 3 shows a top view of the second circuit board 8, the first circuit board 10 and the connection assembly 4 of fig. 1 mated, with reference to fig. 3, the connection assembly 4 being 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, see the labels a and B; the

first connection terminals

5a and 5b are connected to the edge of the second circuit board 8, see the labels C and D. Since the flexible connection tapes (4a, 4b, 4c and 4d) each extend spirally around the axis L1 of the connecting portion 4k, the axis L1 is the spiral axis of the connecting assembly 4, and the second circuit board 8, the connecting assembly 4 and the first circuit board 10 are arranged along the spiral axis, and all have a certain redundancy, when the first circuit board 10 moves laterally (XY direction) relative to the second circuit board 8, the flexible connection tapes (4a, 4b, 4c and 4d) can provide a sufficient amount of redundancy to deform, and only a small material stress needs to be overcome, thereby facilitating quick focusing.

In the configuration shown in fig. 3, the

flexible connection tapes

4a and 4b are each connected to the first circuit board 10 by bonding or soldering by means of an acf (anisotropic Conductive film) process, but this is merely exemplary. The flexible connection strips 4a and 4b may also be of one-piece construction with the first circuit board 10. Similarly, the connection of the flexible connection strips 4c and 4d to the second circuit board 8 may refer to the connection of the flexible connection strips 4a and 4b to the first circuit board 10.

Fig. 4 shows an expanded structure diagram when the second circuit board 8, the first circuit board 10 and the connecting assembly 4 are in an integrally molded structure, and referring to fig. 4, after molding, the first connecting

terminals

5a and 5b are integrally connected to the left side of the first circuit board 10, and the first connecting

terminals

5c and 5d are integrally connected to the right side of the second circuit board 8. The structure can be formed by directly adopting a whole flexible circuit board through the patterning of processes such as etching and the like, the process is simple, the structure is firm, the second circuit board 8, the first circuit board 10 and the connecting assembly 4 are not easy to separate, and the installation is convenient, when the structure is used, the second circuit board 8, the first circuit board 10 and the connecting assembly 4 are directly folded twice (the assembling method is explained through related embodiments later), so that the connecting assembly 4 is positioned between the second circuit board 8 and the first circuit board 10, a Z-shaped integrated structure is formed, and the second circuit board 8, the first circuit board 10 and the connecting assembly 4 are not required to be sequentially bonded and assembled.

In the configuration shown in fig. 2 and 3, each corner of the outer contour R of the connecting member 4 is provided with one first connecting terminal, and each two first connecting terminals are located on one of the two opposite sides. However, this is merely an example, and the two opposite sides are not necessarily provided with two first connection terminals, but only one, or more than three, may be reserved. As long as at least two first connection terminals are ensured to be distributed on two opposite sides of the outer contour of the connection assembly, and the two opposite sides of the connection assembly are provided with the first connection terminals, such a flexible circuit board structure can be directly folded into a "Z" -shaped structure. For another example, the outer contour R of the connecting assembly 4 is not limited to the first connecting terminal only at the corner of the outer contour R, but also may be provided at the middle of any one or more sides of the outer contour R, and each first connecting terminal may be perpendicular (may have an engineering error) to the corresponding side of the outer contour R.

Further, the form of the connecting member 4 is not limited to the structure shown in fig. 2, and four first connecting terminals (5a, 5b, 5c, and 5d) may be respectively located on four different sides of the connecting member 4. Fig. 5 shows a variant of the connecting assembly shown in fig. 2, fig. 5 differing from fig. 2 in that: the first connection terminal 5d is located on the upper side of the outer contour R of the connection member 4 and extends straight upward; the first connection terminal 5b is located on the lower side of the outer contour R of the connection member 4. Here, the

first connection terminals

5a and 5b may be connected to the first circuit board 10, and the

first connection terminals

5c and 5d may be connected to the second circuit board 8. This shape of the connecting member 4 also makes it possible to reduce resistance when the first circuit board 10 is laterally driven, for the purpose of quick focusing.

Fig. 6 shows a variant of fig. 5, the connecting assembly of fig. 6 differing from the connecting assembly of fig. 5 in that: the flexible connecting bands (4a, 4b, 4c and 4d) are changed into anticlockwise spirals; moreover, the middle portion of each flexible connection band is provided with a strip-shaped first hollow extending along the extending direction of the flexible connection band, and specifically, reference may be made to the first hollow U1 in the flexible connection band 4a, so as to further improve the flexibility of the flexible connection band 4a, reduce the resistance of the first circuit board 10 when moving relative to the second circuit board 8, and improve the zooming speed. Alternatively, the structure shown in fig. 6 may be described as follows: the first connection terminals 5a 'of the adjacent flexible connection tapes 4 a' and the first connection terminals 5a "of the flexible connection tapes 4 a" are connected to form one second connection terminal 6a, and the area of connection with the first circuit board 10 is increased by combining the first connection terminals of a plurality of flexible connection tapes into one second connection terminal, which is beneficial to the stability of connection. Similarly, the remaining every adjacent two first connection terminals are also formed with

second connection terminals

6b, 6c, and 6d in this order. And the

second connection terminals

6a and 6c are axisymmetrical with respect to the spiral axis L1, and the

second connection terminals

6b and 6d are axisymmetrical with respect to the spiral axis L1. But wherein the stress of the connecting assembly 4 is more balanced as long as at least two second connecting terminals are ensured to be symmetrical with respect to the screw axis L1 of the connecting assembly. It should be noted that at least two second connection terminals may also be centrosymmetric or rotationally symmetric, as long as they are symmetric about the spiral axis L1, facilitating force balance between the connection assembly 4 and the first circuit board 10. The number of the first hollow-outs in each flexible connecting belt is not necessarily one, and can also be multiple. Fig. 7 shows a variation of fig. 6, wherein two spaced first hollowed-out U1 are provided side-by-side in each flexible connecting strip. A second hollow U2 is provided in the connecting portion 4 k. Thereby, the softness of the entire connecting assembly 4 can be further improved, and the quality of the connecting assembly 4 can be reduced. Similarly, or alternatively, another expression may be made: the first connection terminal 5a 'of the adjacent flexible connection strip 4 a', the first connection terminal 5a "of the flexible connection strip 4 a" and the first connection terminal 5a '"of the flexible connection strip 4 a'" are connected to form a second connection terminal 6 a; similarly,

second connection terminals

6b, 6c, and 6d are formed.

Fig. 8 shows another modified structure of the connecting assembly, which is different from the structure shown in fig. 2 in that the number of the flexible connecting bands is increased to 8, the flexible connecting bands (4e, 4f, 4g, 4h, 4i, 4j, 4m, and 4n) are sequentially arranged, the flexible connecting bands (4e, 4f, 4g, 4h, 4i, 4j, 4m, and 4n) are each spirally extended in a counterclockwise direction, and the ends of the flexible connecting bands (4e, 4f, 4g, 4h, 4i, 4j, 4m, and 4n) are sequentially formed with first connecting terminals (5e, 5f, 5g, 5h, 5i, 5j, 5m, and 5 n). Two first connecting terminals are respectively distributed at each corner of the outer contour R of the connecting component 4. For example, the upper right corner

first connection terminals

5e and 5f are located at the upper right corner of the outer contour R of the connection assembly 4, wherein the first connection terminal 5e is perpendicular to the upper side of the outer contour R and the first connection 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 remaining corners of the outer contour R in a similar manner. Therefore, the first connecting terminals are distributed on each corner of the outer contour R, and the two first connecting terminals are perpendicular to two sides of the corner in one-to-one correspondence. The first connecting

terminals

5n, 5e, 5f and 5g can be connected with the second circuit board 8, the first connecting

terminals

5h, 5i, 5g and 5m are connected with the first circuit board 10, the connecting assembly 4 can provide certain redundancy no matter the first circuit board 10 moves along the x axis or the y axis, resistance is reduced, focusing speed is improved, and stress distribution of the connecting assembly 4 can be more uniform.

It should be understood that a certain corner in fig. 8 may retain only one first connection terminal, and the above-described effects may be achieved to some extent. As long as it is ensured that each corner of the outer contour of the connecting assembly is provided with at least one first connection terminal; the extending direction of each first connection terminal may be perpendicular to one of the side edges corresponding to the corner portion.

Fig. 9 shows a schematic structural diagram of a flexible circuit board in the camera module according to the embodiment of the present application, fig. 10 shows a schematic structural diagram of when the flexible circuit board in fig. 9 is matched with the image sensor through a gasket, and the connection assembly 4 may also adopt the structure shown in fig. 9 in addition to being matched with the first circuit board 10 and the second circuit board 8 to reduce the resistance of the lateral movement of the image sensor 2. In fig. 9, the camera module further includes an outer frame circuit board Q, the middle of the outer frame circuit board Q has a first hollow structure M, the connecting assembly 4 is disposed in the first hollow structure M, and the side of the outer contour of the connecting assembly 4 is substantially parallel to the side of the first hollow structure M in a one-to-one correspondence manner. The flexible connecting strips of the connecting assembly 4 extend in a counterclockwise spiral. The flexible connecting

parts

4a and 4c are axisymmetric about the spiral shaft of the connecting assembly, and the first connecting terminals of the flexible connecting

parts

4a and 4c are respectively connected (connected as an integral type) with the inner side edge of the first hollow structure M, so that the connecting assembly 4 is favorable for balancing stress. First connecting terminal of flexible connecting

portion

4a and 4c respectively with the

equal power extension

4s and 4k that the y axle direction extends,

equal power extension

4s and 4k distribute in coupling assembling 4's the left and right sides to be connected with graphic sensor 2 respectively,

equal power extension

4s and 4k are located coupling assembling 4 both sides and are favorable to coupling assembling 4's balanced atress. In fig. 9, the first connection terminals of the

flexible connection portions

4a and 4c are connected to the connector 18 indirectly through the outer frame circuit board Q, so that the connection between the connection assembly 4 and the connector 18 is realized. And, frame circuit board Q loop configuration is favorable to realizing spacing to coupling assembling 4.

Referring to fig. 10, the image sensor 2 is disposed on the force-equalizing

extensions

4s and 4k, and spacers T1 and T2 are sequentially disposed between the force-equalizing

extensions

4s and 4k, so that a gap is maintained between the image sensor 2 and the connecting assembly 4 to prevent friction; the image sensor 2 and the force equalizing

extension parts

4s and 4k are conducted through gold wires 7. Fig. 11 shows another modification of fig. 10, in fig. 11, the spacers T1 and T2 may also be made into structures integrated with the force-equalizing

extensions

4s and 4k, respectively, so as to form protruding structures on the surfaces of the force-equalizing

extensions

4s and 4k, respectively, and the image sensor 2 is electrically connected to the lines of the protruding structures by CAF or soldering, thereby simplifying the assembly process.

Fig. 12 shows a modification of fig. 9, in which the

force equalizing extensions

4v and 4t are arranged on the left and right sides of the connecting member 4, and the first connecting terminals of the flexible connecting

tapes

4a and 4b are juxtaposed in the upper right corner and connected to the force equalizing extensions 4t, and the first connecting terminals of the flexible connecting

tapes

4c and 4d are juxtaposed in the lower left corner and connected to the force equalizing extensions 4v, and the connector 18 is connected to the force equalizing extensions 4 v. The

uniform force extensions

4t and 4v are connected to the image sensor 2. The force-equalizing

extension portions

4t and 4v are distributed on the left side and the right side of the connecting component 4, so that the stress balance of the connecting component 4 is realized.

Fig. 13 shows a modification of fig. 12, in which an outer frame circuit board Q surrounding the connecting assembly 4 is added on the basis of the structure shown in fig. 12 to limit the connecting assembly 4 and serve as a part of the fixing assembly, and the force-equalizing extension portions 4t are added to the transverse structures distributed on the upper and lower sides of the connecting assembly 4 to further make the force applied to the connecting assembly 4 uniform.

Fig. 14 shows another variation of fig. 9, in which the force equalizing extension 4b adds a lateral structure on the upper side of the connecting assembly 4, and the force equalizing extension 4z adds a lateral structure below the connecting assembly 4, so that the force distribution of the image sensor 2 and the connecting assembly 4 is more uniform.

In summary, in the embodiments shown in fig. 9 to 14, the force-equalizing extension portions each extend along a direction parallel to the outer contour of the connecting assembly 4, which is favorable for matching with the outer contour of the image sensor 2, and thus, balanced force application of the image sensor 2 and the connecting assembly 4 is realized.

Based on the same inventive concept, the present embodiment further provides a flexible circuit board, which may refer to the structure of the connection assembly 4 in the foregoing embodiments, or the integrated structure of the connection assembly 4 and the first circuit board 10 and the second circuit board 8 in fig. 4, or the structure of the connection assembly 4, the force equalizing extensions, and the outer frame circuit board in fig. 9 to 14, and so on. The related advantages refer to the function of the camera module.

Based on the same inventive concept, the embodiment of the present application further provides an assembly method of a flexible circuit board, where the flexible circuit board takes the structure in fig. 4 as a motherboard, and the method includes:

providing the motherboard;

folding the connecting assembly 4 to one side of the first circuit board 10;

folding the second circuit board 8 to the side of the connection assembly 4 remote from the first circuit board 10;

the first circuit board 10 and the second circuit board 8 are finally arranged on opposite sides in the direction of the screw axis L1 of the connecting assembly 4.

The assembling method directly utilizes one mother board for folding, thereby avoiding the step of assembling, simplifying the process and having high stability of the integrated structure.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such 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 such modifications and variations.

Claims

1. The flexible circuit board is characterized by comprising a connecting assembly, wherein the connecting assembly comprises a connecting part and a plurality of flexible connecting belts which are arranged around the connecting part at intervals, and each flexible connecting belt spirally extends around the connecting part in the same direction;

at least two ends, far away from the connecting part, of the flexible connecting bands are provided with first connecting terminals, and every two first connecting terminals are electrically connected.

2. The flexible circuit board of claim 1, wherein each of the flexible connection strips comprises a plurality of sequentially connected segments, and each adjacent two of the segments are connected by bending to form a bent structure.

3. The flexible circuit board of claim 2, wherein each two adjacent segments are connected vertically; the outer profile of the connecting assembly is substantially square.

4. The flexible circuit board of claim 3, further comprising an outer frame circuit board, wherein a first hollow structure is formed in a middle portion of the outer frame circuit board, the connecting assembly is located in the first hollow structure, and a portion of the first connecting terminal is connected to an inner side edge of the first hollow structure.

5. The flexible circuit board of claim 4, wherein the first connection terminals integrally connected to the inner side edge of the first hollow structure are distributed at two corners of the same diagonal line of the outer contour of the connection assembly.

6. The flexible circuit board of claim 3 or 4, wherein the connecting assembly further comprises a strip-shaped uniform force extension part, and the uniform force extension part extends along a direction parallel to the outer contour of the connecting assembly;

and the first connecting terminal of the flexible connecting band is connected with the uniform force extending part.

7. The flexible circuit board according to claim 3, wherein each corner of the outer profile of the connection assembly is provided with at least one of the first connection terminals;

the extending direction of each first connecting terminal is perpendicular to one side edge corresponding to the corner.

8. The flexible circuit board of claim 7, wherein at least two of the first connecting terminals are distributed on two opposite sides of the outer contour of the connecting component.

9. The flexible circuit board of claim 8, further comprising a first circuit board and a second circuit board, wherein the first circuit board, the connection assembly and the second circuit board are arranged in sequence along a spiral axis direction of the connection assembly;

the first connecting terminal on one side of the outer contour of the connecting assembly is connected with the corresponding edge of the first circuit board, and the first connecting terminal on the other side of the outer contour of the connecting assembly is connected with the corresponding edge of the second circuit board.

10. The flexible circuit board according to claim 3, wherein the first connection terminals of at least two adjacent flexible connection tapes are connected to form a second connection terminal.

11. The flexible circuit board according to claim 10, wherein at least two of the second connection terminals are symmetrical with respect to a screw axis of the connection assembly.

12. The flexible circuit board according to claim 3, wherein at least one second hollow structure is provided in a middle portion of each of the connection portions.

13. A camera module, comprising a fixed component, a first circuit board, an image sensor, and the flexible circuit board of any one of claims 1 to 8 and 10 to 12, the image sensor being located on the first circuit board; wherein the content of the first and second substances,

one part of the first connecting terminals are connected with the fixed component, and the other part of the first connecting terminals are connected with the first circuit board, so that the first circuit board is electrically connected with the fixed component and can move relative to the fixed component.

14. A camera module, comprising a connector, an image sensor, and the flexible circuit board of claim 9; wherein the content of the first and second substances,

the connector is connected with the second circuit board, and the image sensor is installed on the surface of the first circuit board, which is far away from the second circuit board.

15. A method of assembling a flexible circuit board, comprising:

providing a motherboard, wherein the motherboard comprises a first circuit board, a second circuit board and a connecting assembly, the connecting assembly comprises a connecting part and a plurality of flexible connecting belts arranged at intervals around the connecting part, each flexible connecting belt spirally extends around the connecting part in the same direction, and the first circuit board and the second circuit board are respectively arranged at two sides of the spiral axis of the connecting assembly; one end of one part of the flexible connecting band, which is far away from the connecting part, is connected with the first circuit board, and the other end of the other part of the flexible connecting band, which is far away from the connecting part, is connected with the second circuit board;

folding the connection assembly to one side of the first circuit board;

folding the second circuit board to a side of the connection assembly away from the first circuit board.