Wireless passive sensor AF camera module and terminal device

Abstract

The invention discloses a wireless passive sensor AF camera module and terminal equipment, belongs to the technical field of camera modules, and solves the technical problem that the focusing precision of the camera module of the terminal equipment is low. The camera module comprises a shell, a lens assembly, a carrier and a driving mechanism, the lens assembly is arranged on the shell, the carrier and the driving mechanism are arranged in the shell, the driving mechanism drives the carrier to reciprocate in the optical axis direction of the lens assembly, the carrier comprises a driving plate, and the driving plate is arranged at the bottom of the carrier. The driving assembly is provided with an electronic component, a lens Bluetooth module and a receiving coil, the electronic component is electrically connected with the lens Bluetooth module, the receiving coil is used for generating current, and the electronic component, the lens Bluetooth module and the driving assembly are all electrically connected with the receiving coil. The carrier of the camera module is less limited and high in moving precision, so that the focusing efficiency and the focusing precision of the camera module can be improved, and the arrangement freedom degree of the camera module in the terminal equipment is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of camera modules, and in particular relates to a wireless passive sensor AF camera module and a terminal device. Background Art

[0002] In order to adapt to the growing camera demand in the high-end flagship mobile phone market, mobile terminal devices are mostly equipped with more than two camera modules. The existing conventional lens AF camera module includes a VCM motor, a bracket, a filter, a hard board, a flexible circuit board, a chip and a connector. The VCM motor carries the lens inside, and the VCM motor performs AF focusing on the lens. The VCM motor is arranged on the bracket, the filter is arranged below the VCM motor and also arranged on the bracket, the hard board is arranged at the bottom of the bracket, the flexible circuit board is connected to the hard board, and a connector is arranged at the tail end of the flexible circuit board. The chip is arranged on the upper surface of the hard board and is electrically connected to the connector through the flexible circuit board. The VCM motor includes a magnet and a coil. When the coil is energized, it acts with the magnet to move the lens in the VCM motor up and down, thereby realizing the automatic focusing operation of the lens AF. However, the lens AF camera module has a heavy lens and a large size, and the lens has a large resistance when moving up and down to automatically focus, which easily leads to problems of inaccurate focusing and low precision. In addition, when a mobile terminal device is equipped with multiple camera modules, the number of electronic components and connectors used increases, resulting in unstable current, large resistance, large camera module size, and high cost. Therefore, it is necessary to provide a wireless passive sensor AF camera module and terminal device to solve the above technical problems. Summary of the invention

[0003] The present application aims to solve the technical problem of low focusing accuracy of a camera module of a terminal device to at least a certain extent. To this end, the present application provides a wireless passive sensor AF camera module and a terminal device.

[0004] In order to achieve the above objectives, the technical solution of this application is as follows:

[0005] A wireless passive sensor AF camera module comprises a shell, a lens assembly, a carrier and a driving mechanism, wherein the lens assembly is arranged on the shell, the carrier and the driving structure are arranged in the shell, and the driving mechanism drives the carrier to reciprocate along the optical axis direction of the lens assembly, wherein the carrier comprises a driving plate, the driving plate is arranged at the bottom of the carrier, the driving plate is provided with electronic components, a lens Bluetooth module and a receiving coil, the electronic components are electrically connected to the lens Bluetooth module, the receiving coil is used to generate current, and the electronic components, the lens Bluetooth module and the driving assembly are all electrically connected to the receiving coil.

[0006] In some embodiments, the electronic components and the lens Bluetooth module are both disposed on a side of the driving board facing the lens assembly, and the electronic components correspond to the lens assembly.

[0007] In some embodiments, the last lens element of the lens assembly is coated with an IR filter film.

[0008] In some embodiments, the Bluetooth antenna of the lens Bluetooth module is disposed on a side of the driving board facing away from the lens assembly, and the electronic component is a photosensitive chip.

[0009] In some embodiments, the driving board is a circuit board, and the receiving coil is disposed on the back side of the driving board.

[0010] In some embodiments, the shell includes an outer shell and a base, the bottom end of the outer shell is fixed to the top end of the base; the lens assembly is fixed to the top end of the outer shell; an upper spring plate is arranged between the top end of the carrier and the outer shell, and a lower spring plate is arranged between the bottom end of the carrier and the base.

[0011] In some embodiments, the upper spring sheet and the lower spring sheet are the same and are both supporting reset members, the driving mechanism is a voice coil motor, the voice coil motor includes a motor coil and a magnet, the motor coil is arranged around the circumference of the carrier, and the magnet is arranged on the inner wall of the outer shell.

[0012] In some embodiments, the two magnets are respectively disposed on two opposite inner walls of the outer shell.

[0013] In some embodiments, a groove or a through hole is disposed in the middle of the base, and the groove or the through hole is disposed opposite to the carrier, and the groove or the through hole does not interfere with the up and down movement of the carrier and the driving plate.

[0014] A terminal device comprises a camera module, a terminal device Bluetooth module and a power supply coil, wherein the terminal device Bluetooth module is wirelessly connected to the lens Bluetooth module, the power supply coil is wirelessly connected to the receiving coil, and the power supply coil is electrically connected to a power source of the terminal device. When the power supply coil is energized, the receiving coil generates current.

[0015] The embodiments of the present application have at least the following beneficial effects:

[0016] It can be seen from the above technical scheme that the wireless passive sensor AF camera module and terminal device of the present application replace the function of the connector set at the tail end of the flexible circuit board in the traditional camera module through the lens Bluetooth module to realize the wireless transmission function of the data signal, and realize the wireless power supply function through the cooperation of the receiving coil and the power supply coil. The two wireless transmission methods replace the function of the flexible circuit board, so that the carrier of the driven mechanism has small resistance during the reciprocating movement, and the focusing is accurate and efficient. As the number of lenses of the camera module increases, the number of sensors matching the lenses in the camera module increases accordingly, and the advantages of the camera module in this embodiment will be more obvious; the camera module cancels the flexible circuit board, and the connector set at the end of the flexible circuit board will also be cancelled, which can reduce the size of the camera module, and the arrangement of the camera module will be more free, providing more possibilities for the layout of the terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of the camera module in an embodiment of the present application is shown;

[0019] Figure 2 Shows Figure 1 A structural schematic diagram of the camera module from another perspective;

[0020] Figure 3 Shows Figure 1 A structural schematic diagram of another viewing angle of the camera module;

[0021] Figure 4 Shows Figure 3 AA cross-sectional view of the camera module;

[0022] Figure 5 Shows Figure 1 The middle is a schematic diagram of the exploded structure of the camera module;

[0023] Markings in the figure: 100 - carrier, 200 - driving mechanism, 201 - coil, 202 - magnet, 300 - driving board, 400 - electronic components, 500 - lens Bluetooth module, 501 - Bluetooth antenna, 600 - receiving coil, 700 - shrapnel, 800 - lens assembly, 910 - housing, 920 - base. DETAILED DESCRIPTION

[0024] In order to clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application, it is obvious that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0026] right Figure 1 A schematic diagram of the three-dimensional structure of the camera module in an embodiment of the present application is shown; Figure 2 Shows Figure 1 A structural schematic diagram of the camera module from another perspective; Figure 3 Shows Figure 1 A structural schematic diagram of another viewing angle of the camera module; Figure 4 Shows Figure 3 AA cross-sectional view of the camera module; Figure 5 Shows Figure 1 The middle is a schematic diagram of the explosion structure of the camera module.

[0027] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0028] like Figure 1-Figure 5 As shown, this embodiment provides a wireless passive sensor AF camera module, which is used to reduce the resistance of the flexible circuit board to the carrier 100 in the existing camera module during the movement. Figure 1-Figure 4The camera module includes a housing, a lens assembly 800, a carrier 100 and a driving mechanism 200. The lens assembly 800 is arranged on the housing. Specifically, the lens assembly 800 is fixed to the upper surface of the housing by glue, and the last lens in the lens assembly 800 is coated with an IR filter film to filter excess light. The carrier 100 and the driving structure 200 are arranged in the housing. The driving mechanism 200 drives the carrier 100 to reciprocate along the optical axis direction of the lens assembly 800. Specifically, the driving mechanism 200 includes a motor coil 201 and a magnet 202. In this embodiment, the motor coil 201 cooperates with the magnet 202 after being energized to drive the carrier 100 to move up and down along the optical axis direction of the lens assembly 800, thereby realizing The automatic focusing of the chip is now; the carrier 100 includes a driving board 300, which is arranged at the bottom of the carrier 100, and the driving board 300 is provided with electronic components 400, a lens Bluetooth module 500 and a receiving coil 600, the electronic components 400 correspond to the position of the lens assembly 800, the receiving coil 600 is used to generate current, the electronic components 400, the lens Bluetooth module 500 and the driving assembly 200 are all electrically connected to the receiving coil 600, that is, the driving mechanism 200 drives the carrier 100 to move and drives the driving board 300 to move back and forth, thereby changing the distance between the lens assembly 800 and the electronic components 400, thereby realizing the focusing function of the camera module.

[0029] In this embodiment, the driving board 300 is a circuit board, the electronic component 400 is a photosensitive chip, the electronic component 400 is electrically connected to the lens Bluetooth module 500, the multiple electronic components 400 in the camera module are electrically connected to each other, and the wires for realizing electrical connection between the electronic components 400 are all integrated on the driving board 300, so that the data transmission inside the camera module is completed through electrical connection, and the data transmission between the camera module and the installed terminal device is carried out through the lens Bluetooth module 500, and the lens Bluetooth module 500 replaces the function of the connector set at the tail end of the flexible circuit board in the traditional camera module.

[0030] In this embodiment, the motor coil 201 in the driving mechanism 200 is arranged on the carrier 100, and the magnet 202 is arranged on the inner wall of the shell, and the position of the magnet 202 corresponds to that of the motor coil 201. Because the electronic components 400, the lens Bluetooth module 500 and the motor coil 201 in the driving mechanism 200 are all electrically connected to the receiving coil 600, the terminal device is provided with a power supply coil matching the receiving coil 600. After the power supply coil is energized, the magnetic field generated acts on the receiving coil 600, so that current can be generated in the receiving coil 600, and the generated current can supply power to the electronic components 400, the lens Bluetooth module 500 and the motor coil 201 in the driving mechanism 200.

[0031] In this embodiment, the receiving coil 600 is powered by wireless charging, so that the power consumed in the camera module can be provided through the receiving coil 600 to provide the current required by the driving mechanism 200. The receiving coil 600 supplies power to the motor coil 201 in the driving mechanism 200, so that the magnet 202 and the motor coil 201 generate a magnetic field, providing driving force for the carrier 100. It can also be understood that the above electrically connected wires or part of the wires are integrated on the driving board 300.

[0032] In this embodiment, the lens Bluetooth module 500 is a basic module capable of data transmission, and the receiving coil 600 is a structural component capable of implementing non-charging. The camera module of this embodiment replaces the data transmission function of the connector connected to the flexible circuit board through the lens Bluetooth module 500, and the receiving coil 600 replaces the power supply function of the connector connected to the flexible circuit board in the existing camera module, thereby making the carrier 100 driven by the driving mechanism 200 have less resistance during the reciprocating movement, and improving the focusing accuracy and focusing efficiency of the camera module without being affected by external forces. With the increase of the lens of the camera module, the number of sensors matching the lens in the camera module will increase accordingly, and the advantages of the camera module in this embodiment will be more obvious. Accordingly, the camera module no longer has a flexible circuit board and a connector connected to the flexible circuit board, and the overall size of the camera module becomes smaller. Correspondingly, the device on which the camera module is installed no longer needs to be provided with a connector that matches the camera module. This not only reduces the size of the camera module, but also saves space for the terminal device on which the camera module is installed. Without the restriction of the connector, the arrangement of the camera module on the terminal device will be freer, providing more possibilities for the layout of the terminal device.

[0033] Reference Figure 4 The electronic components 400 and the lens Bluetooth module 500 are arranged on the front of the driving board 300 to reasonably utilize the space in the camera module carrier 200, and the parts of the electronic components 400 and the lens Bluetooth module 500 facing the lens are not blocked by other components. The electronic components 400 and the lens Bluetooth module 500 are not easily damaged when moving with the driving board 300, and, to a certain extent, the camera module can protect the electronic components 400 and the lens Bluetooth module 500. Figure 2 The Bluetooth antenna 501 of the lens Bluetooth module 500 is arranged on the back of the driving board 300. It can be understood that the back of the driving board 300 is closer to the Bluetooth module for receiving signals in the terminal device. The signal transmitted by the Bluetooth antenna 501 only needs to pass through the outer shell of the camera module, which reduces the obstruction between the Bluetooth antenna 501 and the Bluetooth module of the installed terminal device, thereby improving the data transmission efficiency.

[0034] In this embodiment, the receiving coil 600 is disposed on the back of the driving board 300, thereby reducing the distance between the power supply coils of the terminal device where the receiving coil 600 is installed, improving the power transmission efficiency and the stability of the power supply. Figure 2 The Bluetooth antenna 501 is located in the middle of the receiving coil 600, which rationally utilizes the space on the back of the driving board 300. In addition, since the electronic components 400, the lens Bluetooth module 500 and the motor coil 201 in the driving mechanism 200 are all electrically connected to the receiving coil 600, the electrically connected circuit adopts an internal wiring design of the circuit inside the driving board 300.

[0035] In this embodiment, the shell includes an outer shell 910 and a base 920. The base 920 is a supporting structure for supporting other components of the camera module. Of course, the camera module is also connected to the terminal device through the bottom of the base 920. The bottom end of the outer shell 910 is fixed to the top of the base 920. The outer shell 910 and the base 920 together constitute the external frame of the camera module to protect other modules of the camera module. The lens assembly 800 is fixed to the top of the housing 910, and the carrier 100 is arranged in the housing 910. After the external light passes through the lens assembly 800, the light is irradiated on the surface of the electronic component 400. When the power supply coil of the terminal device is energized, the magnetic field generated acts on the receiving coil 600, so that current is generated in the receiving coil 600. The generated current supplies power to the electronic component 400, the lens Bluetooth module 500 and the motor coil 201 in the driving mechanism 200, and then the electronic component 400 starts working and converts the optical signal into an electrical signal. Since the electronic component 400 is electrically connected to the lens Bluetooth module 500, the electrical signal can be transmitted by the lens Bluetooth module 500 to the Bluetooth module of the terminal device, thereby completing the data transmission of the camera module, and then the image generation work can be completed through the terminal device.

[0036] In this embodiment, an upper spring sheet 700 is arranged between the top of the carrier 100 and the shell 910, and a lower spring sheet (not shown) is arranged between the bottom of the carrier 100 and the base 920. The upper spring sheet 700 and the lower spring sheet are the same and are both supporting and resetting members. The upper spring sheet 700 and the lower spring sheet support the carrier 100 inside the shell 910. Specifically, when the driving mechanism 200 drives the carrier 100 to rise and fall when powered on, the upper spring sheet 700 and the lower spring sheet are stretched at this time to perform focusing operations for moving the chip up and down. After power is cut off, the driving mechanism 200 can no longer continue to drive the carrier 100, and the upper spring sheet 700 and the lower spring sheet are reset, so that the carrier 100 can be pulled back to move in a direction close to the base 920, that is, the upper spring sheet 700 and the lower spring sheet reset the carrier 100 to the initial position of the carrier 100, thereby realizing the focusing operation of the electronic component 400, i.e., the chip in the direction of the optical axis.

[0037] Furthermore, in this embodiment, the driving mechanism 200 is a voice coil motor, which includes a motor coil 201 and a magnet 202. The motor coil 201 is arranged around the circumference of the carrier 100, and the magnet 202 is arranged on the inner wall of the outer shell 910, and one pole of the magnet 202 is facing the motor coil 201 and is perpendicular to the axis of the motor coil 201. The magnetic field generated by the motor coil 201 after power is supplied interacts with the magnetic field of the magnet 202, so that the carrier 100 rises and falls along the optical axis.

[0038] Reference Figure 4 The present embodiment provides two magnets 202, which are respectively arranged on two opposite inner walls of the shell 910, and the distance between the two magnets 202 and the top of the shell 910 is equal, so that the force on the carrier is balanced and the smoothness of the carrier 100 during movement is improved.

[0039] Further, see Figure 2 and Figure 4 The housing 910 is fixed on the base 920, and a groove is provided in the middle of the base 920, and the groove is arranged opposite to the carrier 100, and the groove does not interfere with the up and down movement of the carrier 100 and the driving plate 300. In another embodiment, a through hole may also be provided in the middle of the base 920, and the through hole is arranged opposite to the carrier 100, and the through hole does not interfere with the up and down movement of the carrier 100 and the driving plate 300.

[0040] This embodiment also provides a terminal device, including a terminal device Bluetooth module, a power supply coil and the above-mentioned camera module. The terminal device Bluetooth module is wirelessly connected to the lens Bluetooth module 500 to realize data transmission between the terminal device and the camera module. The power supply coil is wirelessly connected to the receiving coil 600. Generally speaking, the power supply coil and the receiving coil 600 are arranged relative to each other to provide more efficient power transmission. The power supply coil is electrically connected to the power supply of the terminal device, that is, the power supply coil is electrically connected to the battery of the terminal device. When the power supply coil is energized, the receiving coil can generate current so that the driving mechanism can drive the carrier to move when energized. At the same time, the terminal device equipped with the camera module also has the effect of being able to focus quickly and with high focusing accuracy.

[0041] The working principle of the wireless passive sensor AF camera module of this embodiment is as follows: when the power supply coil of the terminal device is energized, the generated magnetic field acts on the receiving coil 600, and a current is generated in the receiving coil 600. The current supplies power to the motor coil 201 in the driving mechanism 200. The motor coil 201 is energized to interact with the magnet 202, driving the electronic components 400 on the driving plate 300 at the bottom of the carrier 100 to move up and down. Then, external light travels from the lens assembly 800 to the surface of the electronic components 400. The electronic components 400 receive the light and convert the optical signal into an electrical signal. Then, the electrical signal is transmitted to the Bluetooth module of the terminal device through the lens Bluetooth module 500 electrically connected thereto. The terminal device receives the electrical signal and performs image processing and generation.

[0042] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] In the description of the present application, it should be understood that the terms "center", "middle", "length", "width", "up", "down", "horizontal", "top", "bottom", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0045] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0048] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0049] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A wireless passive sensor AF camera module, characterized in that: It includes a shell, a lens assembly, a carrier and a driving mechanism, wherein the lens assembly is arranged on the shell, the carrier and the driving structure are arranged in the shell, and the driving mechanism drives the carrier to reciprocate along the optical axis direction of the lens assembly, wherein the carrier includes a driving plate, the driving plate is arranged at the bottom of the carrier, the driving plate is provided with electronic components, a lens Bluetooth module and a receiving coil, the electronic components are electrically connected to the lens Bluetooth module, the receiving coil is used to generate current, and the electronic components, the lens Bluetooth module and the driving assembly are all electrically connected to the receiving coil.

2. The wireless passive sensor AF camera module according to claim 1, characterized in that: The electronic components and the lens Bluetooth module are both arranged on a side of the driving board facing the lens assembly, and the electronic components correspond to the lens assembly.

3. The wireless passive sensor AF camera module according to claim 2, characterized in that: The last lens element of the lens assembly is coated with an IR filter film.

4. The wireless passive sensor AF camera module according to claim 2, characterized in that: The Bluetooth antenna of the lens Bluetooth module is arranged on a side of the driving board facing away from the lens assembly, and the electronic component is a photosensitive chip.

5. The wireless passive sensor AF camera module according to claim 1, characterized in that: The driving board is a circuit board, and the receiving coil is arranged on the back side of the driving board.

6. The wireless passive sensor AF camera module according to claim 1, characterized in that: The shell comprises an outer shell and a base, the bottom end of the outer shell is fixed to the top end of the base; the lens assembly is fixed to the top end of the outer shell; an upper spring sheet is arranged between the top end of the carrier and the outer shell, and a lower spring sheet is arranged between the bottom end of the carrier and the base.

7. The wireless passive sensor AF camera module according to claim 6, characterized in that: The upper spring sheet and the lower spring sheet are identical and are both supporting reset members. The driving mechanism is a voice coil motor. The voice coil motor includes a motor coil and a magnet. The motor coil is arranged around the circumference of the carrier, and the magnet is arranged on the inner wall of the shell.

8. The wireless passive sensor AF camera module according to claim 7, characterized in that: The two magnets are respectively arranged on two opposite inner walls of the shell.

9. The wireless passive sensor AF camera module according to claim 6, characterized in that: A groove or a through hole is arranged in the middle of the base, and the groove or the through hole is arranged opposite to the carrier, and the groove or the through hole does not interfere with the up and down movement of the carrier and the driving plate.

10. A terminal device, characterized in that: It comprises a camera module, a terminal device Bluetooth module and a power supply coil as described in any one of claims 1 to 9, wherein the terminal device Bluetooth module is wirelessly connected to the lens Bluetooth module, the power supply coil is wirelessly connected to the receiving coil, the power supply coil is electrically connected to the power supply of the terminal device, and when the power supply coil is energized, the receiving coil generates current.

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