A lens module circuit board and a camera module

Abstract

The present invention discloses a lens module circuit board and a camera module, relating to the technical field of cameras, and solving the technical problems of complex assembly process and large volume of the existing camera module. The lens module circuit board includes a circuit board body carrying a lens module and a coil assembly that cooperates with a magnetic member to drive the lens module to move along the optical axis direction. The circuit board body is electrically connected to a first pin, the coil assembly is electrically connected to a second pin, and the first pin is electrically connected to the second pin. By electrically connecting the first pin and the second pin, the present invention enables the coil assembly to be directly electrically connected to the circuit board body carrying the lens module, without separately designing a circuit board for the coil assembly, and enables the coil assembly and the circuit board body to share a connector, which can save a circuit board and a connector for the coil assembly, thereby simplifying the assembly process of the camera module and reducing the volume of the entire camera module.

Description

Technical Field

[0001] The present invention relates to the technical field of cameras, and more specifically, to a lens module circuit board and a camera module. Background Art

[0002] An autofocus camera changes the image distance by driving a motor to make an object clearly imaged while keeping the focal length unchanged. The design of an autofocus camera is inseparable from the design of the driving motor, and the driving motor generally includes a coil and a magnetic member. According to Faraday's law, by changing the magnitude of the coil current, the magnitude of the electromagnetic force generated is changed, thereby driving the camera to move.

[0003] In the prior art, the circuit board of the driving motor includes two boards. One is the circuit board for connecting the coil, and the other is the circuit board for connecting the camera module. And the two circuit boards are respectively connected with connectors through flexible cables. When assembling the camera module, it is necessary to assemble the connectors of the coil circuit board and the connectors of the camera module circuit board on the main board respectively, which not only makes the assembly process of the entire camera module complicated, but also due to the existence of the two circuit boards and the connectors, the overall volume of the camera module is large. Therefore, how to design the circuit board structure of the driving motor to reduce the volume of the camera module has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to overcome the deficiencies of the prior art. On the one hand, a lens module circuit board is provided to solve the technical problems of complicated assembly process and large volume caused by using two circuit boards in the prior art camera module.

[0005] The technical solution adopted by the present invention to solve this technical problem is:

[0006] A lens module circuit board includes:

[0007] A circuit board body on which a lens module is mounted, and the circuit board body is electrically connected with a first pin; and,

[0008] A coil assembly, which cooperates with a magnetic member to drive the lens module to move along the optical axis direction, and the coil assembly is electrically connected with a second pin;

[0009] Wherein, the first pin is electrically connected with the second pin.

[0010] Based on the above technical solution, the lens module circuit board can be further improved as follows.

[0011] Optionally, the coil assembly includes a coil body and a position sensor, and the second pin is electrically connected with the coil body and the position sensor respectively.

[0012] Optionally, a first bracket is provided outside the lens module. The lens module is installed inside the first bracket, and the coil body and the position sensor are installed on the first bracket.

[0013] Optionally, it further includes a carrier board. The coil body, the second pin, and the position sensor are arranged on the carrier board, and the carrier board is installed on the first bracket.

[0014] Optionally, an installation groove is formed by inward depression on the outer side wall of the first bracket, and the carrier board is inserted into the installation groove along the optical axis direction of the lens module.

[0015] Optionally, the coil body is connected to the surface of the carrier board by means of etching, glue injection or pasting. The position sensor is arranged at the center or edge of the carrier board where the coil body is located, and the second pin is arranged at the edge position of the carrier board.

[0016] Optionally, the position sensor is a Hall sensor or a TMR sensor.

[0017] Optionally, the first pin is located at the end of the circuit board body close to the coil assembly and extends in the direction of the coil assembly, and the second pin extends to a position connected to the first pin.

[0018] Optionally, two sets of the coil assemblies are connected to the circuit board body, and the two sets of the coil assemblies are perpendicularly distributed on the outer periphery of the lens module.

[0019] In a second aspect, the present invention further provides a camera module, including a lens module, a magnetic member, and the above-mentioned lens module circuit board. The lens module is installed on the circuit board body, and the magnetic member is arranged opposite to the coil assembly.

[0020] Compared with the prior art, the beneficial effects of the lens module circuit board provided by the present invention are:

[0021] By electrically connecting the first pin and the second pin, the present invention enables the coil assembly to be directly electrically connected to the circuit board body carrying the lens module, without separately designing a circuit board for the coil assembly. The coil assembly and the circuit board body share a connector, which can save a circuit board and a connector for the coil assembly, thereby simplifying the assembly process of the camera module and reducing the volume of the entire camera module. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a schematic structural diagram of a lens module circuit board in the prior art;

[0024] Figure 2 is an exploded structural diagram of the present invention;

[0025] Figure 3 is Figure 1 a schematic structural diagram of the first bracket in ;

[0026] Figure 4 is Figure 1 a schematic structural diagram of the second bracket in ;

[0027] Figure 5 is Figure 1 a schematic structural diagram of the coil assembly in ;

[0028] Figure 6 is Figure 1 a schematic structural diagram of the third bracket in ;

[0029] Figure 7 is a top view structural diagram of the present invention;

[0030] Figure 8 is a sectional view structural diagram of the present invention;

[0031] Figure 9 is a three-dimensional structural diagram of the present invention;

[0032] Figure 10 is a bottom view structural diagram of the present invention.

[0033] In the figure:

[0034] a—coil; b—coil circuit board; c—module circuit board; d—coil connector; e—module connector;

[0035] 10—first bracket; 11—first mounting groove; 12—first limiting step; 20—second bracket; 21—second mounting groove; 22—second limiting step; 30—coil assembly; 31—carrier plate; 32—coil body; 33—first pin; 34—position sensor; 40—magnetic part; 41—yoke; 50—lens module; 51—second pin; 52—circuit board body; 60—third bracket; 61—first claw; 62—second claw. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention fall within the scope protected by the present invention.

[0037] Embodiment 1:

[0038] As Figure 1 shown, the drive motor in the prior art is designed with two circuit boards, namely a coil circuit board b for connecting coil a and a module circuit board c for carrying the lens module. Among them, the coil circuit board b is connected with a coil connector d through a flexible cable, and the module circuit board c is connected with a module connector e through a flexible cable. Coil a obtains current through the connection of the coil connector d with the main board, and the module circuit board c conveys an image signal through the connection of the module connector e with the main board.

[0039] When assembling the camera module, it is necessary to connect the coil connector d and the module connector e to the main board respectively, resulting in a complex assembly process for the camera module. In addition, since the coil circuit board b, the coil connector d, and the flexible cable connecting the two are all arranged outside the drive motor, the volume of the entire camera module is relatively large.

[0040] The present invention provides a lens module circuit board, as Figures 2 to 10 shown, which includes a first bracket 10, a second bracket 20, a coil assembly 30, and a magnetic member 40. As Figure 3 shown, the overall shape of the first bracket 10 is a square-shaped structure with a hollow part. The outer side wall of the first bracket 10 is recessed inward to form a first installation groove 11, and the coil assembly 30 is installed in the first installation groove 11. A lens module 50 for taking images is installed in the hollow part inside the first bracket 10. The bottom of the lens module 50 is electrically connected to a circuit board body 52, and the first bracket 10 and the lens module 50 are connected to form an integral structure. Of course, the recessed area of the first installation groove 11 is set according to the actual size of the coil assembly 30.

[0041] As Figure 4As shown, the overall shape of the second bracket 20 is also a zigzag structure with a hollow part, and the first bracket 10 is sleeved inside the hollow part of the second bracket 20. The inner sidewall of the second bracket 20 is recessed outward to form a second mounting groove 21, and the magnetic member 40 is installed in the second mounting groove 21. Among them, the coil assembly 30 and the magnetic member 40 are arranged opposite to each other, so that the magnetic member 40 can drive the energized coil assembly 30 through magnetic force to drive the lens module 50 to move. Of course, the recessed area of the second mounting groove 21 is set according to the actual size of the magnetic member 40. A yoke 41 that plays a role in guiding magnetic lines is also installed between the magnetic member 40 and the inner sidewall of the second bracket 20. At the same time, the yoke 41 can also shield the external magnetic field to avoid interference of the external magnetic field on the coil assembly 30.

[0042] It can be understood that the magnetic member 40 of the present invention includes but is not limited to magnets or magnetic stones, and can even be formed by winding coils. For example, adopting the same structure as the coil assembly 30 of the present invention, using the magnetic thrust generated after the coil body 32 is energized, it can also drive the coil assembly 30 to move.

[0043] As Figure 5 shown, the coil assembly 30 includes a carrier plate 31, a coil body 32, and a position sensor 34. The coil body 32 and the position sensor 34 are both arranged on the carrier plate 31. The carrier plate 1 has a rectangular plate structure, and the four corners of the rectangular plate structure are rounded chamfers, which is convenient for the assembly of the carrier plate 1. The carrier plate 31 can be selected as a PCB, and a conductive plate is embedded in the carrier plate 31 at the position of the coil body 32. Among them, the thickness of the conductive plate is less than the thickness of the PCB, and the conductive plate can be in the shape of an elliptical ring or a circular ring. The conductive plate is etched into the shape of the coil body 32 by etching, and the etching depth of the conductive plate is greater than the thickness of the conductive plate, so that the turns of the coil body 32 are disconnected from each other, so that the coil body 32 is integrated on the carrier plate 31.

[0044] As another implementation method, the coil body 32 can also be formed by separately winding a conductive wire, and the coil body 32 is connected to the carrier plate 31 by SMT soldering, glue injection encapsulation or pasting. Among them, the carrier plate 31 can be selected as a PCB, an FPC or a rigid-flexible combination board and other structures. Of course, installation parts such as installation grooves or connection plates can also be provided on the carrier plate 31, and the coil body 32 is installed in the installation groove or connection plate of the carrier plate 31, and the coil body 32 can also be integrated on the carrier plate 31.

[0045] As Figure 2 , Figure 5 , Figure 8 and Figure 10As shown, after the carrier board 31 is installed in the first installation groove 11, it is perpendicular to the circuit board body 52 at the bottom of the lens module 50. A first pin 33 is provided at the bottom of the carrier board 31, and a second pin 51 is provided at the end of the circuit board body 52 close to the first pin 33. The second pin 51 extends to a position connected to the first pin 33, and the first pin 33 and the second pin 51 are electrically connected by soldering, so as to realize the electrical connection between the coil assembly 30 and the lens module 50.

[0046] In the present invention, by electrically connecting the first pin 33 and the second pin 51, the coil assembly 30 is directly electrically connected to the circuit board body 52, and there is no need to separately design a circuit board for the coil assembly 30. The coil assembly 30 and the circuit board body 52 share a connector, which can save the circuit board and connector positions of one coil assembly 30, thus simplifying the assembly process of the camera module and reducing the volume of the entire camera module.

[0047] As Figure 5 shown, the position sensor 34 can be arranged on the carrier board 31 at the center of the coil body 32 or on the carrier board 31 at the edge of the coil body 32, as long as the position sensor 34 is located between the coil body 32 and the magnetic member 40 and can sense the position where the magnetic field changes, so as to output the signal of the lens module 50 moving along the optical axis direction. It avoids the position sensor 34 being arranged outside the driving motor, further reducing the volume of the camera module and expanding the external space of the camera module. Among them, the position sensor 34 includes but is not limited to a Hall sensor or a TMR sensor.

[0048] When the coil body 32 is powered on, after the coil body 32 is powered on, the magnetic member 40 generates a magnetic thrust on the coil body 32, so as to drive the lens module 50 to move along the optical axis direction. In the present invention, the coil assembly 30 is arranged on the first bracket 10, and the magnetic member 40 is arranged on the second bracket 20, which can reduce the magnetic interference of the external magnetic field on the lens module 50. In addition, the coil assembly 30 integrates the integrated design of the coil body 32 and the position sensor 34, realizing the modular application of the coil assembly 30, and avoiding the problem that the position sensor 34 has a large volume due to being arranged outside the camera module. The coil assembly 30 is directly electrically connected to the lens module 50, and also saves the space position of a connector. When assembling the camera module, only the connector of the lens module 50 needs to be connected to the main board, reducing the assembly process difficulty of the camera module. In addition, the gimbal module of the present invention is also applicable to the periscope camera module.

[0049] It can be understood that according to the movement requirements of the lens module 50, two sets of coil components 30 can be installed on the side wall of the first bracket 10 in the present invention. At the same time, two sets of magnetic components 40 are installed on the side wall of the second bracket 20. The two sets of coil components 30 are distributed perpendicular to each other on the outer periphery of the lens module 50, and the two sets of magnetic components 40 are arranged opposite to the positions of the two sets of coil components 30 respectively, so as to realize the function that the lens module 50 moves along the optical axis in two directions respectively.

[0050] As Figure 3 shown in Figure 4 Specifically, a first limiting step 12 is provided at the bottom of the first installation groove 11 on the side wall of the first bracket 10, and the coil component 30 is limited and installed in the first installation groove 11 through the first limiting step 12. A second limiting step 22 is provided at the bottom of the second installation groove 21 on the side wall of the second bracket 20, and the magnetic component 40 is limited and installed in the second installation groove 21 through the second limiting step 22. The four corners of the coil component 30, the magnetic component 40 and the yoke 41 are all arc chamfers, which facilitates the installation of the coil component 30, the magnetic component 40 and the yoke 41 into the first bracket 10 and the second bracket 20 respectively.

[0051] As Figure 6 shown in Figure 7 A third bracket 60 is provided on the top of the lens module 50. The third bracket 60 includes a first claw 61 and a second claw 62, and the length of the first claw 61 is greater than that of the second claw 62. The end of the first claw 61 is clamped between the first bracket 10 and the second bracket 20, and the end of the second claw 62 is clamped between the first bracket 10 and the lens module 50. Among them, the third bracket 60 is made of a metal elastic sheet. When the current in the coil component 30 decreases or loses power, the lens module 50 is reset under the elastic action of the third bracket 60.

[0052] Embodiment 2:

[0053] The present invention also provides a camera module, as Figures 7 to 10 shown in

[0054] including a lens module 50 and the pan-tilt module in the above embodiment. The lens module 50 is installed in the first bracket 10 of the pan-tilt module, the first bracket 10 is sleeved in the second bracket 20, the coil component 30 is installed on the first bracket 10, the magnetic component 40 is installed on the second bracket 20, the third bracket 60 is installed on the top of the lens module 50, and the circuit board of the lens module 50 is connected to the main board through a connector.

[0055] Compared with the prior art, since the coil assembly 30 is mounted on the first bracket 10 and the magnetic member 40 is mounted on the second bracket 20, the magnetic interference of the external magnetic field on the lens module 50 can be reduced. At the same time, integrating the coil body 32 and the position sensor 34 on the carrier board 31 reduces the volume of the camera module and simplifies the assembly process of the camera module.

[0056] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A lens module circuit board, characterized in that, Comprising: A circuit board body, on which a lens module is mounted, and the circuit board body is electrically connected to a second pin; and, A coil assembly, which cooperates with a magnetic member to drive the lens module to move along the optical axis direction, and the coil assembly is electrically connected to a first pin; Wherein, the first pin is electrically connected to the second pin; The second pin is located at an end of the circuit board body close to the coil assembly and extends towards the coil assembly, and the first pin extends to a position connected to the second pin.

2. The lens module circuit board according to claim 1, wherein The coil assembly includes a coil body and a position sensor, and the first pin is electrically connected to the coil body and the position sensor respectively.

3. The lens module circuit board according to claim 2, wherein A first bracket is arranged outside the lens module, the lens module is installed in the first bracket, and the coil body and the position sensor are installed on the first bracket.

4. The lens module circuit board according to claim 3, wherein, It further includes a carrier plate, the coil body, the first pin and the position sensor are arranged on the carrier plate, and the carrier plate is installed on the first bracket.

5. The lens module circuit board according to claim 4, wherein An installation groove is formed by inward depression on the outer side wall of the first bracket, and the carrier plate is inserted into the installation groove along the optical axis direction of the lens module.

6. The lens module circuit board according to claim 5, wherein, The coil body is connected to the surface of the carrier plate by means of etching, glue injection or pasting, the position sensor is arranged at a position in the center or on the edge of the carrier plate where the coil body is located, and the first pin is arranged at the edge position of the carrier plate.

7. The lens module circuit board according to claim 6, wherein The position sensor is a Hall sensor or a TMR sensor.

8. The lens module circuit board according to claim 7, wherein, The circuit board body is connected with two groups of the coil assemblies, and the two groups of the coil assemblies are distributed perpendicular to each other on the outer periphery of the lens module.

9. A camera module, characterized in that, Comprising a lens module, a magnetic member and the lens module circuit board according to any one of claims 1 to 8, the lens module is installed on the circuit board body, and the magnetic member is arranged opposite to the coil assembly.

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