A pan / tilt module and a camera module

Abstract

The present invention discloses a pan-tilt module and a camera module, which relate to the field of camera technology and solve the technical problem that the existing driving motor makes the camera susceptible to interference from an external magnetic field. The pan-tilt module includes a first bracket for mounting a lens module and a second bracket sleeved on the outside of the first bracket, a coil assembly is mounted on the first bracket, and a magnetic component arranged opposite to the coil assembly is mounted on the second bracket, and the magnetic component drives the lens module to move along the optical axis. The present invention arranges the coil assembly on the first bracket on which the lens module is mounted, and arranges the magnetic component on the second bracket. When the coil assembly is energized, since the coil assembly is located inside the magnetic component, the magnetic interference of the external magnetic field on the lens module can be reduced, and the magnetic component drives the coil assembly to drive the lens module to move; when the coil assembly is not energized, since the coil assembly does not generate a magnetic thrust, the magnetic interference of the external magnetic field on the lens module can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of camera technology, and in particular to a pan / tilt module and a camera module. Background Art

[0002] The autofocus camera changes the image distance by driving the motor while keeping the focal length unchanged, so that the object can be imaged clearly. The design of the autofocus camera is inseparable from the design of the drive motor, which generally includes a coil and a magnetic part. According to Faraday's law, by changing the size of the coil current, the size of the electromagnetic force generated changes, thereby driving the camera to move.

[0003] In the prior art, the magnetic parts of the drive motor are generally installed on the mover (equipped with a camera), and the coil is generally installed on the stator. When the coil is energized, due to the existence of an external magnetic field, for example, the magnetic field formed by the magnetic screws, speakers, vibration motors or adjacent drive motors assembled in the terminal device, it is possible to produce a magnetic thrust on the movement of the camera. Even if the coil is not energized, since the magnetic parts are set on the mover, the external magnetic field will also produce a magnetic thrust on the camera, causing the camera to shake and making the captured image unclear. In addition, the existing camera module is large in size, and the assembly process of the entire camera module is also relatively complicated. Therefore, how to design a drive motor structure that can reduce the impact of the external magnetic field on the camera has become a technical problem that needs to be solved urgently by technicians in this technical field. Summary of the invention

[0004] In view of this, an object of the present invention is to overcome the deficiencies of the prior art. On the first aspect, a pan / tilt module is provided to solve the technical problem in the prior art that the driving motor makes the camera susceptible to interference from an external magnetic field.

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

[0006] A pan / tilt module, comprising:

[0007] A first bracket is used to install the lens module, and a coil assembly is installed on the first bracket; and

[0008] A second bracket, sleeved on the outside of the first bracket, the second bracket being provided with a magnetic member arranged opposite to the coil assembly;

[0009] The lens module carried by the first bracket is driven by the magnetic part on the second bracket to move along the optical axis.

[0010] Based on the above technical solution, the gimbal module can also be improved as follows.

[0011] Optionally, the outer side wall of the first bracket is recessed inward to form a first installation groove, and the coil assembly is installed in the first installation groove.

[0012] Optionally, a first limiting step located at the bottom of the first installation groove is provided on the side wall of the first bracket, and the coil assembly is limitedly installed in the first installation groove by the first limiting step.

[0013] Optionally, the inner side wall of the second bracket is recessed outward to form a second mounting groove, the second mounting groove is opposite to the first mounting groove, and the magnetic member is installed in the second mounting groove.

[0014] Optionally, a magnetic yoke is further installed between the magnetic member and the inner side wall of the second bracket.

[0015] Optionally, a second limiting step located at the bottom of the second installation groove is provided on the side wall of the second bracket, and the magnetic component is limitedly installed in the second installation groove by the second limiting step.

[0016] Optionally, the coil assembly includes a carrier and a coil body, the coil body is disposed on the carrier by etching, glue injection or pasting, and a position sensor located at the center or edge of the coil body is mounted on the carrier.

[0017] Optionally, a first pin is provided on the carrier board, and the coil body and the position sensor are electrically connected to the first pin respectively; a second pin is provided on the lens module, and the first pin is electrically connected to the second pin.

[0018] Optionally, it also includes a third bracket installed on the lens module, the third bracket includes a first claw and a second claw, the first claw is clamped between the first bracket and the second bracket, and the second claw is clamped between the first bracket and the lens module.

[0019] In a second aspect, the present invention further provides a camera module, comprising a lens module and the above-mentioned gimbal module, wherein the lens module is installed in the first bracket.

[0020] Compared with the prior art, the pan / tilt module provided by the present invention has the following beneficial effects:

[0021] The present invention arranges the coil component on a first bracket on which a lens module is installed, and arranges the magnetic component on a second bracket. When the coil component is energized, since the coil component is located inside the magnetic component, magnetic interference of the external magnetic field on the lens module can be reduced, and the magnetic component drives the coil component to drive the lens module to move; when the coil component is not energized, since the coil component does not generate a magnetic thrust, magnetic interference of the external magnetic field on the lens module can be avoided, thereby ensuring the clarity of image capture. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the decomposed structure of the pan / tilt module in the prior art;

[0024] Figure 2 It is a schematic diagram of the decomposed structure of the present invention;

[0025] Figure 3 yes Figure 1 A schematic diagram of the structure of the first bracket;

[0026] Figure 4 yes Figure 1 A schematic diagram of the structure of the second bracket;

[0027] Figure 5 yes Figure 1 Schematic diagram of the structure of the coil assembly;

[0028] Figure 6 yes Figure 1 A schematic diagram of the structure of the third bracket;

[0029] Figure 7 It is a schematic diagram of the top view of the structure of the present invention;

[0030] Figure 8 It is a cross-sectional structural schematic diagram of the present invention;

[0031] Fig. 9 It is a three-dimensional structural schematic diagram of the present invention;

[0032] Fig.10 It is a schematic diagram of the structure of the present invention when viewed from above.

[0033] In the figure:

[0034] a—coil; b—external bracket; c—magnetic element; d—internal bracket; e—sensor; f—second connector;

[0035] 10—first bracket; 11—first mounting slot; 12—first limiting step; 20—second bracket; 21—second mounting slot; 22—second limiting step; 30—coil assembly; 31—carrier; 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 DESCRIPTION

[0036] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than comprehensive embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0037] Embodiment 1:

[0038] like Figure 1 As shown, the driving motor in the prior art is to set the coil a on the circuit board, the circuit board with the coil a is installed on the outer bracket b, and the magnet c is installed on the inner bracket d. The circuit board with the coil a is connected to the sensor e for detecting the camera action through a flexible flat cable, and the sensor e is connected to the first connector (located at the bottom of the sensor e) through the flexible flat cable. In addition, the circuit board of the camera module is also connected to the second connector f through the flexible flat cable.

[0039] The first connector and the second connector f are connected to the mainboard respectively. When the coil a is energized, the magnet c generates a magnetic thrust on the coil a, thereby driving the coil a to drive the camera module to move to achieve the purpose of adjusting the focal length. However, due to the existence of the external magnetic field, the coil a is easily disturbed by the external magnetic field and shakes, resulting in unclear images taken by the camera.

[0040] In addition, the existing camera module external sensor e makes the entire camera module larger in size. When assembling the camera module, the first connector and the second connector f need to be connected to the mainboard respectively, which also makes the assembly process of the camera module more complicated.

[0041] The present invention provides a pan / tilt module, such as Figures 2 to 10 As shown, it includes a first bracket 10, a second bracket 20, a coil assembly 30 and a magnetic member 40. Figure 3As shown, the overall shape of the first bracket 10 is a zigzag structure with a hollow part. The outer sidewall 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. The 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 the 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.

[0042] As Figure 4 shown, the overall shape of the second bracket 20 is also a zigzag structure with a hollow part. 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 installation groove 21, and the magnetic part 40 is installed in the second installation groove 21. Among them, the coil assembly 30 and the magnetic part 40 are arranged opposite to each other, so that the magnetic part 40 can drive the energized coil assembly 30 through the magnetic field force to drive the lens module 50 to move. Of course, the recessed area of the second installation groove 21 is set according to the actual size of the magnetic part 40. A yoke 41 that plays a role in guiding magnetic lines of force is also installed between the magnetic part 40 and the inner sidewall of the second bracket 20. At the same time, the yoke 41 can also play a role in shielding the external magnetic field to avoid interference of the external magnetic field on the coil assembly 30.

[0043] It can be understood that the magnetic part 40 of the present invention includes but is not limited to magnets or magnetic stones, and even 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.

[0044] 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 a PCB, and a conductive plate located at the position of the coil body 32 is inlaid on the carrier plate 31. Among them, the thickness of the conductive plate is less than the thickness of the PCB, and the conductive plate can have an elliptical ring or circular ring structure. The conductive plate is etched into the shape of the coil body 32 by an etching method, 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.

[0045] As another embodiment, the coil body 32 can also be formed by winding a conductive wire separately, and the coil body 32 can be connected to the carrier 31 by SMT soldering, glue injection packaging or pasting. Among them, the carrier 31 can use a structure such as PCB, FPC or a soft-hard combination board. Of course, it is also possible to set an installation groove or a connecting plate and other installation parts on the carrier 31, and install the coil body 32 on the installation groove or connecting plate of the carrier 31, which can also make the coil body 32 integrated on the carrier 31.

[0046] like Figure 2 , Figure 5 , Figure 8 as well as Fig.10 As shown, after the carrier board 31 is installed in the first installation slot 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 is electrically connected to the second pin 51 by welding, thereby realizing the electrical connection between the coil assembly 30 and the lens module 50.

[0047] The present invention electrically connects the first pin 33 and the second pin 51 so that the coil assembly 30 is directly electrically connected to the circuit board body 52. ​​There is no need to design a separate 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 position of the coil assembly 30, thereby simplifying the assembly process of the camera module and reducing the volume of the entire camera module.

[0048] like Figure 5 As shown, the position sensor 34 can be set on the carrier plate 31 at the center of the coil body 32, or on the carrier plate 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 change in the magnetic field, thereby outputting a signal that the lens module 50 moves along the optical axis. This avoids the position sensor 34 being set outside the drive motor, further reducing the size 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.

[0049] When the coil body 32 is energized, the magnetic part 40 generates a magnetic thrust on the coil body 32 after the coil body 32 is energized, thereby driving the lens module 50 to move along the direction of the optical axis. The present invention sets the coil assembly 30 on the first bracket 10 and sets the magnetic part 40 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, realizes the modular application of the coil assembly 30, and avoids the problem of the position sensor 34 being larger in size due to being set outside the camera module. The coil assembly 30 is directly electrically connected to the lens module 50, and the space position of a connector is saved. When assembling the camera module, it is only necessary to connect the connector of the lens module 50 to the main board, which reduces the difficulty of the assembly process of the camera module. In addition, the gimbal module of the present invention is also applicable to periscope camera modules.

[0050] It is understandable that, according to the need for movement of the lens module 50, the present invention can install two sets of coil assemblies 30 on the side wall of the first bracket 10. At the same time, two sets of magnetic members 40 are installed on the side wall of the second bracket 20. The two sets of coil assemblies 30 are distributed perpendicularly to each other on the periphery of the lens module 50, and the two sets of magnetic members 40 are respectively arranged relative to the positions of the two sets of coil assemblies 30, so as to realize the function of the lens module 50 moving along the optical axis in two directions.

[0051] like Figure 3 and Figure 4 As shown, in particular, a first limiting step 12 is provided on the side wall of the first bracket 10 and is located at the bottom of the first mounting groove 11, and the coil assembly 30 is limitedly installed in the first mounting groove 11 by the first limiting step 12. A second limiting step 22 is provided on the side wall of the second bracket 20 and is located at the bottom of the second mounting groove 21, and the magnetic member 40 is limitedly installed in the second mounting groove 21 by the second limiting step 22. The four corners of the coil assembly 30, the magnetic member 40 and the yoke 41 are all chamfered with arcs, so that the coil assembly 30, the magnetic member 40 and the yoke 41 can be conveniently installed in the first bracket 10 and the second bracket 20 respectively.

[0052] like Figure 6 and Figure 7 As shown, 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 the length 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. The third bracket 60 is made of metal springs. When the current in the coil assembly 30 decreases or loses power, the lens module 50 is reset under the elastic action of the third bracket 60.

[0053] Embodiment 2:

[0054] The present invention also provides a camera module, such as Figures 7 to 10 As shown, it includes 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 assembly 30 is installed on the first bracket 10, the magnetic member 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] When the circuit board of the lens module 50 is powered, the coil assembly 30 generates a magnetic thrust on the magnetic member 40, and the lens module 50 moves along the optical axis driven by the coil assembly 30. When the focus adjustment is completed, the lens module 50 is reset under the elastic action of the third bracket 60.

[0056] Compared with the prior art, the present invention can reduce the magnetic interference of the external magnetic field on the lens module 50 because the coil assembly 30 is installed on the first bracket 10 and the magnetic member 40 is installed on the second bracket 20. At the same time, the coil body 32 and the position sensor 34 are integrated on the carrier board 31, which reduces the volume of the camera module and simplifies the assembly process of the camera module.

[0057] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pan / tilt module, characterized in that: include: A first bracket, used for mounting the lens module, wherein a coil assembly is mounted on the first bracket; as well as, A second bracket, sleeved on the outside of the first bracket, the second bracket being provided with a magnetic member arranged opposite to the coil assembly; The lens module carried by the first bracket is driven by the magnetic member on the second bracket to move along the optical axis; The third bracket is installed on the lens module, and the third bracket includes a first claw and a second claw. The length of the first claw is greater than the length of the second claw. The first claw is clamped between the first bracket and the second bracket, and the second claw is clamped between the first bracket and the lens module.

2. The pan / tilt module according to claim 1, characterized in that: The outer side wall of the first bracket is recessed inward to form a first installation groove, and the coil assembly is installed in the first installation groove.

3. The pan / tilt module according to claim 2, characterized in that: A first limiting step is disposed on the side wall of the first bracket and is located at the bottom of the first installation groove. The coil assembly is limitedly installed in the first installation groove by the first limiting step.

4. The pan / tilt module according to claim 2, characterized in that: The inner side wall of the second bracket is recessed outward to form a second mounting groove, the second mounting groove is opposite to the first mounting groove, and the magnetic member is installed in the second mounting groove.

5. The pan / tilt module according to claim 4, characterized in that: A magnetic yoke is also installed between the magnetic member and the inner side wall of the second bracket.

6. The pan / tilt module according to claim 4, characterized in that: A second limiting step located at the bottom of the second mounting groove is provided on the side wall of the second bracket, and the magnetic member is limitedly installed in the second mounting groove by the second limiting step.

7. The pan / tilt module according to claim 1, characterized in that: The coil assembly includes a carrier plate and a coil body. The coil body is arranged on the carrier plate by etching, glue injection or pasting. A position sensor located at the center or edge of the coil body is installed on the carrier plate.

8. The pan / tilt module according to claim 7, characterized in that: A first pin is disposed on the carrier board, and the coil body and the position sensor are electrically connected to the first pin respectively. A second pin is disposed on the lens module, and the first pin is electrically connected to the second pin.

9. A camera module, characterized in that: It comprises a lens module and a pan / tilt head module according to any one of claims 1 to 8, wherein the lens module is installed in the first bracket.

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