CN215647071U - Bending FPC elastic piece structure - Google Patents

Abstract

The application relates to the technical field of precision parts, and discloses a bent FPC (flexible printed circuit) elastic sheet structure which is used for bearing the motion of an image sensor and comprises a central part and an outer elastic wire arm, wherein the central part is used for installing the image sensor, the outer elastic wire arm is movably connected with the central part and is arranged on the periphery of the central part in a surrounding manner, and the outer elastic wire arm is bent relative to the central part; an inner spring wire arm is arranged between the central part and the outer spring wire arm, and the inner spring wire arm is arranged around the periphery of the central part and is movably connected with the central part and the outer spring wire arm. According to the method, the outer elastic wire arm is bent relative to the central part, the K value in the Z direction is obviously increased at the bending part, and the posture difference of the image sensor in the moving process is greatly reduced.

Description

Bending FPC elastic piece structure

Technical Field

The application relates to the technical field of precision parts, concretely relates to FPC shell fragment structure of bending.

Background

In the prior Sensor-Shift technology, an FPC (flexible printed circuit) elastic sheet is mostly adopted to bear an image Sensor, and the FPC elastic sheet plays roles of transmitting image signals and balancing Shift magnetic field force. The existing FPC clips are used to ensure that the image sensor moves along the X-axis and the Y-axis (i.e., the direction in the radial plane of the camera module), and the Z-axis (i.e., the direction of the optical axis) is focused using a separate AF motor. Under an ideal condition, when the camera is subjected to optical anti-shake, the image sensor cannot generate displacement in the Z-axis direction, otherwise, the photographing effect is influenced; the displacement degree of the image sensor in the Z direction depends on the elastic K value of the FPC elastic piece in the Z direction, so that the larger the elastic K value of the FPC elastic piece in the Z direction is, the better the elastic K value of the FPC elastic piece in the Z direction is under the condition of ensuring the proper elastic K value in the X/Y direction, however, the existing FPC elastic piece adopts a plane structure, is softer in the Z direction, and is also difficult to increase the K value in the Z direction. Meanwhile, when the camera needs to focus, the camera is in a structure additionally provided with a common AF motor to realize the function. And this is complicated in assembly and process; it is also expensive in terms of cost due to the large number of parts.

SUMMERY OF THE UTILITY MODEL

In order to solve the FPC shell fragment that prior art exists and less at the elastic coefficient of optical axis direction, produce the problem that the displacement volume caused the error easily in optical axis direction during the anti-shake motion, this application provides the FPC shell fragment structure of bending that the elastic coefficient is enough big on optical axis direction.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

a bent FPC elastic sheet structure is used for bearing the motion of an image sensor and comprises a central part and an outer elastic wire arm, wherein the central part is used for mounting the image sensor, the outer elastic wire arm is movably connected with the central part and is arranged on the periphery of the central part in a surrounding mode, and the outer elastic wire arm is bent relative to the central part; an inner spring wire arm is arranged between the central part and the outer spring wire arm, and the inner spring wire arm is arranged around the periphery of the central part and is movably connected with the central part and the outer spring wire arm.

The optical anti-shake technology is a technology for improving imaging quality by utilizing the fact that an optical component in a camera module reversely moves relative to shake in the shooting process of an instrument, wherein the optical component comprises a lens and an image sensor. Most camera modules applied to mobile phones all adopt a scheme of a movable lens to realize optical anti-shake, the requirements for lightness and thinness and camera definition of the mobile phones are higher and higher, and more diversified camera scenes are obtained, more and more mobile phones start to use the camera modules of the movable image Sensor, namely, a Sensor-Shift technology, the Sensor is an image Sensor, an important part of an FPC (flexible printed circuit) elastic sheet is arranged in the camera modules, the Sensor has a fixed part used for installing the image Sensor and connected with the camera modules, the image Sensor moves in a certain range in the camera modules, and a movable part synchronously moving with the image Sensor is further arranged. The existing FPC elastic piece adopts a plane structure, a movable part is movably connected with a fixed part through a connecting arm formed by FPC hollow cutting, the connecting arm is a part used for ensuring that an image sensor moves along an X axis and a Y axis, and an independent AF motor is used for focusing in the Z axis direction. Because the FPC material is softer, the uncontrolled movement is easily generated along the Z-axis direction to cause control errors, and the shooting effect is influenced. Under the condition that an AF motor is not suitable for being used, accurate displacement control in the Z-axis direction is difficult to achieve only by the FPC elastic sheet.

Therefore, in order to solve the problem that the existing FPC elastic sheet is difficult to realize accurate control in three-axis directions simultaneously and is easy to generate errors in the Z-axis direction when only used for controlling the displacement of an X axis and a Y axis, the FPC elastic sheet in the scheme adopts a bending structure, and because the central part moves along with the image sensor, the outer elastic wire arm is used for drawing, supporting and connected with a fixed part in a camera module to keep a fixed state, the outer elastic wire arm is bent relative to the central part, the bending part obviously increases the K value in the Z direction, and the posture difference of the image sensor in the moving process is greatly reduced.

In addition, the scheme further optimizes the connection between the central part and the outer spring wire arm, a multilayer surrounding design is adopted, the periphery of the central part surrounds the inner spring wire arm, the periphery of the inner spring wire arm surrounds the outer spring wire arm, and through the improvement of the elastic sheet structure, the movement of the central part and the inner spring wire arm relative to the outer spring wire arm forms the Shift movement in the Sensor-Shift technology, namely the translation and the rotation movement on the plane formed by the X axis and the Y axis, and the rotation movement around the X axis and the Y axis, and meanwhile, the bending connection between the inner spring wire arm and the outer spring wire arm ensures that the Z axis direction has a large enough elastic coefficient, and the up-down movement of the inner spring wire arm and the central part relative to the outer spring wire arm along the Z axis direction is reduced or avoided. And the movable connection between the central part and the inner spring wire arm enables the central part to form AF focusing movement relative to the movement of the inner spring wire arm, and the inner spring wire arm plays a role in drawing and stabilizing the focusing movement of the central part. Thereby through the improvement to the shell fragment structure for the shell fragment can carry out the Shift motion simultaneously and the AF focuses the motion, and the drive of motion can be provided by two sets of magnets that set up in the module of making a video recording, thereby has avoided additionally setting up the problem that the AF motor need occupy a large amount of spaces, produces the error along Z axle direction displacement when also avoiding image sensor to carry out the Shift motion.

Furthermore, the two opposite sides of the central part are connected with the inner spring wire arm through the first connecting part to form an integrated structure, and the two opposite sides of the inner spring wire arm perpendicular to the first connecting part are bent and connected with the outer spring wire arm through the second connecting part to form an integrated structure.

Furthermore, the bending part between the outer elastic wire arm and the second connecting part is provided with a first bending joint, and an included angle between the first bending joint and the outer elastic wire arm and between the first bending joint and the inner elastic wire arm is half of the bending angle of the outer elastic wire arm relative to the inner elastic wire arm.

Furthermore, the outer spring wire arm comprises four bending parts and four transition parts, wherein the four bending parts and the four transition parts are connected end to end and enclose into a quadrangular shape, the bending parts are bent relative to the central part, and the transition parts and the central part are positioned on the same plane.

Furthermore, the edge of the outer spring wire arm is provided with a pin connected with an external circuit, and the pin is bent relative to the outer spring wire arm.

Furthermore, the bending part between the outer elastic wire arm and the pin is provided with a second bending joint, and the included angle between the second bending joint and the outer elastic wire arm and the pin is half of the bending angle of the pin relative to the outer elastic wire arm.

Furthermore, the bending angle of the outer spring wire arm relative to the inner spring wire arm and the bending angle of the pin relative to the outer spring wire arm are 30-90 degrees.

Furthermore, the bending angle of the outer spring wire arm relative to the inner spring wire arm and the bending angle of the pin relative to the outer spring wire arm are 90 degrees.

Furthermore, the FPC elastic sheet consists of a wiring layer, an insulating layer and an elastic sheet layer which are sequentially stacked.

The beneficial effect of this application is: according to the method, the outer elastic wire arm is bent relative to the central part, the K value in the Z direction is obviously increased at the bending part, and the posture difference of the image sensor in the moving process is greatly reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a top view of the present application prior to bending;

FIG. 2 is a schematic perspective view of the present application before bending;

FIG. 3 is a schematic structural diagram of the present application;

FIG. 4 is an enlarged partial schematic view at A of FIG. 3;

FIG. 5 is an enlarged partial schematic view at B in FIG. 3;

fig. 6 is an exploded schematic view of the FPC clip installed in the complete camera module in the present application;

fig. 7 is a schematic structural diagram of the complete camera module after installation.

In the figure: 1-a central part; 101-a first connection; 2-inner spring arm; 201-a second connection portion; 3-an outer spring arm; 301-bending part; 302-a transition; 303 — first bending joint; 4-pins; 401-second bending joint; 5-lens; 6-lens mount; 7-PCB soft and hard combined board; an 8-OIS coil; 9-OIS stent; 10-an image sensor; 11-AF coil; 12-AF scaffold; 13-lower cover.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1:

as shown in fig. 3, the bending FPC elastic sheet structure is used for carrying a motion of an image sensor 10, and includes a central portion 1 for mounting the image sensor 10, and an outer elastic wire arm 3 movably connected to the central portion 1 and disposed around the periphery of the central portion 1, wherein the outer elastic wire arm 3 is bent relative to the central portion 1; an inner spring wire arm 2 is arranged between the central part 1 and the outer spring wire arm 3, and the inner spring wire arm 2 is arranged around the periphery of the central part 1 and is movably connected with the central part 1 and the outer spring wire arm 3.

The working principle is as follows:

the camera module capable of finishing the camera shooting function comprises a lens 5 and two main optical components of an optical sensor, and a driving mechanism for driving the optical components and a mounting mechanism for drawing and stabilizing the optical components are further arranged in the camera module with the optical anti-shake function. FPC shell fragment in this application is the part that is used for the installation to bear image sensor 10 for actuating mechanism can drive image sensor 10 and carry out anti-shake motion in the certain limit of making a video recording in the module, guarantees the definition of formation of image with offsetting the shake of shooting in-process. The FPC elastic sheet comprises a central portion 1 and an outer elastic wire arm 3, the central portion 1 is fixedly connected with the image sensor 10, the outer elastic wire arm 3 is fixedly connected with a fixed component in the camera module, such as a shell and the like, along with synchronous movement of the image sensor 10, stable installation of the FPC elastic sheet in the camera module is guaranteed, and the outer elastic wire arm 3 can play a role in traction and stabilization for movement of the central portion 1. Meanwhile, the bending of the outer spring wire arm 3 relative to the central part 1 in the application means that an included angle with a certain angle is formed between the outer spring wire arm 3 and the central part 1. Based on the elastic sheet is a sheet structure, when the central portion 1 moves relative to the outer elastic wire arm 3, the joint of the central portion and the outer elastic wire arm is subjected to tensile force parallel to the plane of the connecting structure to generate elastic deformation, and the elastic sheet with the plane structure easily causes the uncontrolled displacement of the whole central portion 1 along the Z-axis direction, namely, the up-and-down shaking. In the application, after the outer elastic wire arm 3 is bent, the bent structure absorbs the stress in the vertical direction by using the elastic sheet, and the condition that the central part 1 shakes up and down is reduced.

Example 2:

this example is further optimized and defined based on example 1.

As shown in fig. 3, opposite sides of the central portion 1 are connected to the inner spring wire arm 2 through the first connection portion 101 to form an integrated structure, and opposite sides of the inner spring wire arm 2 perpendicular to the first connection portion 101 are bent and connected to the outer spring wire arm 3 through the second connection portion 201 to form an integrated structure.

In order to facilitate the clear of the position relationship among the central portion 1, the inner spring wire arm 2 and the outer spring wire arm 3, as shown in fig. 1-2, the structure of the outer spring wire arm 3 before bending is schematically illustrated, the FPC clip in the present application is of a multi-layer surrounding design, the inner spring wire arm 2 surrounds the periphery of the central portion 1, and the outer spring wire arm 3 surrounds the periphery of the inner spring wire arm 2. The movements of the central part 1 and the inner spring arm 2 relative to the outer spring arm 3 form a Shift movement in the Sensor-Shift technique, i.e. a movement in a plane consisting of the X-axis and the Y-axis, even including a rotational movement around the X-axis and the Y-axis. The bending connection between the inner spring wire arm 2 and the outer spring wire arm 3 ensures that the elastic coefficient in the Z-axis direction is large enough, and the up-and-down movement of the inner spring wire arm 2 and the central part 1 relative to the outer spring wire arm 3 along the Z-axis direction is reduced or avoided. The movable connection between the central part 1 and the inner spring wire arm 2 enables the central part 1 and the inner spring wire arm 2 to move relatively to form AF focusing movement, and the inner spring wire arm 2 plays a role in drawing and stabilizing the focusing movement of the central part 1.

As shown in fig. 6, which is an exploded schematic view of the FPC clip applied to a complete camera module, the lens mount 6, the PCB rigid-flex board 7 and the lower cover 13 distributed from top to bottom are combined to form a housing portion and a fixed base of the camera module. The lens 5 is axially aligned with the center of the image sensor 10, the lens 5 faces the outside of the housing, and the image sensor 10 is arranged in the housing. And a plurality of magnets are also fixed in the shell, a plurality of OIS coils 8 are arranged corresponding to the magnets, the OIS coils 8 are fixed on an OIS support 9, and the OIS support 9 is directly and fixedly connected with the inner spring wire arm 2, so that a group of driving mechanisms for driving the image sensor 10 to move in a Shift mode is formed. Because the image sensor 10 needs to be capable of moving both Shift movement and AF focusing movement only by means of the support of the FPC elastic sheet, a group of driving mechanisms for independently driving the image sensor 10 to do AF focusing movement is further arranged, the driving mechanisms comprise an AF support 12 directly and fixedly connected with the image sensor 10 and an AF coil 11 fixed on the support, the AF coil 11 also interacts with the magnets to provide driving, and due to the fact that the current directions in the AF coil 11 and the OIS coil 8 are different, acting forces in different directions can be generated between the AF coil and the magnets according to left-hand rules. As shown in fig. 7, which is an external structural view of the camera module after the installation is completed, the overall thickness is significantly reduced because the AF motor is not additionally provided.

It should be noted that, because the bending structure is arranged to absorb a certain force to avoid or reduce the vertical shaking of the inner elastic wire arm 2, and the degree of influence of the bending angle on the vertical shaking is far less than that of the bending structure itself, the bending angle is preferably set to 30 degrees to 90 degrees, and the bending angle of the outer elastic wire arm 3 relative to the inner elastic wire arm 2 and the bending angle of the pin 4 relative to the outer elastic wire arm 3 as shown in the figure are both 90 degrees, which is only an example. Of course, the most preferable bending angle is 90 degrees, so as to facilitate the installation of the FPC elastic sheet and the fixed connection with the shell.

In addition, a preferred arrangement scheme of the bending mode of the outer elastic wire arm 3 is provided, as shown in fig. 3 and 4, a first bending joint 303 is arranged at a bending position between the outer elastic wire arm 3 and the second connecting portion 201, and an included angle between the first bending joint 303 and the outer elastic wire arm 3 and an included angle between the first bending joint 303 and the inner elastic wire arm 2 are half of the bending angle of the outer elastic wire arm 3 relative to the inner elastic wire arm 2. The first bending joint 303 is substantially a similar chamfer structure formed by two bending actions between the connection part of the second connection part 201 and the outer elastic wire arm 3, in the two-side bending actions, the angle of each bending is half of the angle between the actual outer elastic wire arm 3 and the actual inner elastic wire arm 2, for example, the outer elastic wire arm 3 needs to be perpendicular to the inner elastic wire arm 2, and the first bending joint is bent by 45 degrees from the end close to the second connection part 201 and connected with the outer elastic wire arm 3, and then is bent by 45 degrees from the end. The first bending connector 303 is arranged to effectively avoid springback after bending, and the stability of the bending angle is guaranteed to be unchanged.

As shown in fig. 3 and 4, the outer spring arm 3 includes four bending portions 301 and four transition portions 302 which are connected end to end and enclose a quadrangle, the bending portions 301 are bent with respect to the central portion 1, and the transition portions 302 are in the same plane with the central portion 1. In order to keep the wholeness of FPC shell fragment in this scheme, avoid cutting in the four corners of outer shell wire arm 3, will set up transition portion 302 in the four corners position of outer shell wire arm 3, utilize the vacancy of four corners position to make four portions 301 of bending respectively to bend, keep the wholeness of FPC shell fragment.

Example 3:

in this embodiment, further optimization and limitation are performed on the basis of embodiment 2.

As shown in fig. 3 and 5, the edge of the outer spring arm 3 is provided with a pin 4 for connecting an external circuit, and the pin 4 is bent relative to the outer spring arm 3. Bend between outer silk arm 3 and the pin 4 and locate to be equipped with the second joint 401 of bending, the contained angle between second joint 401 of bending and outer silk arm 3 and the pin 4 is pin 4 for the half of outer silk arm 3 angle of bending. The principle of the second bending joint 401 is the same as that of the first bending joint 303, so that the bending angle between the pin 4 and the outer spring wire arm 3 is stable and unchanged.

Example 4:

this embodiment is further optimized and defined based on any one of the above embodiments.

The FPC elastic piece consists of a wiring layer, an insulating layer and an elastic piece layer which are sequentially stacked. The routing layer is thin and plays a role in communication of electric signals, the elastic sheet layer mainly plays a role in adjusting the K value of a spring and balancing a magnetic field force, and the insulating layer insulates and separates the routing layer from the elastic sheet layer.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (9)

1. The utility model provides a FPC shell fragment structure of bending for bear image sensor (10) motion, its characterized in that: the device comprises a central part (1) for mounting an image sensor (10) and an outer spring wire arm (3) which is movably connected with the central part (1) and is arranged around the periphery of the central part (1), wherein the outer spring wire arm (3) is bent relative to the central part (1);

an inner wire ejecting arm (2) is arranged between the central part (1) and the outer wire ejecting arm (3), and the inner wire ejecting arm (2) is arranged around the central part (1) and movably connected with the central part (1) and the outer wire ejecting arm (3).

2. A bent FPC spring structure according to claim 1, characterized in that: the two opposite sides of the central part (1) are connected with the inner wire ejecting arm (2) through a first connecting part (101) to form an integrated structure, and the two opposite sides of the inner wire ejecting arm (2) perpendicular to the first connecting part (101) are bent and connected with the outer wire ejecting arm (3) through a second connecting part (201) to form the integrated structure.

3. A bent FPC clip structure according to claim 2, wherein: bend between outer silk arm (3) and the second connecting portion (201) and locate to be equipped with first bending joint (303), contained angle is outer silk arm (3) for interior silk arm (2) bend half of angle degree between first bending joint (303) and outer silk arm (3) and interior silk arm (2).

4. A bent FPC clip structure according to any one of claims 1 to 3, characterised in that: the outer spring wire arm (3) comprises four bending parts (301) and four transition parts (302) which are connected end to end and enclose to form a quadrangle, the bending parts (301) are bent relative to the central part (1), and the transition parts (302) and the central part (1) are located on the same plane.

5. A bent FPC clip structure according to claim 2, wherein: the edge of the outer spring wire arm (3) is provided with a pin (4) connected with an external circuit, and the pin (4) is bent relative to the outer spring wire arm (3).

6. A bent FPC spring structure according to claim 5, characterized in that: bend between outer silk arm (3) and pin (4) and locate to be equipped with the second and bend joint (401), the contained angle that second bend joint (401) and between outer silk arm (3) and pin (4) is pin (4) and is half for outer silk arm (3) angle of bending.

7. A bent FPC spring structure according to claim 5, characterized in that: the bending angle of the outer spring wire arm (3) relative to the inner spring wire arm (2) and the bending angle of the pin (4) relative to the outer spring wire arm (3) are 30-90 degrees.

8. A bent FPC spring structure according to claim 5, characterized in that: the bending angle of the outer spring wire arm (3) relative to the inner spring wire arm (2) and the bending angle of the pin (4) relative to the outer spring wire arm (3) are 90 degrees.

9. A bent FPC spring structure according to claim 1, characterized in that: the FPC elastic piece consists of a wiring layer, an insulating layer and an elastic piece layer which are sequentially stacked.

Images