FPC antenna structure and bone conduction earphone

Abstract

The utility model provides an FPC antenna structure and a bone conduction earphone, the FPC antenna structure is applied to the bone conduction earphone, and the FPC antenna structure comprises a circuit board, a connecting part and an FPC antenna; the circuit board comprises a circuit board body and a signal transmission circuit arranged on the circuit board body, and the signal transmission circuit is provided with an antenna pin and a grounding pin; the connecting part is fixed on the circuit board body and is connected with the antenna pin and the grounding pin; the FPC antenna abuts against the connecting part and is electrically connected with the antenna pin and the grounding pin, and the FPC antenna is used for receiving or transmitting electric signals. The FPC antenna structure adopts a planar inverted F antenna form, the structure is simple, the cost is relatively low, a clearance zone does not need to be arranged, the design difficulty of the antenna is reduced, and the antenna performance and the anti-interference capability of the FPC antenna in the form are relatively strong.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and more specifically, to an FPC antenna structure and a bone conduction headset. Background Art

[0002] Currently, Bluetooth headsets are widely used in various fields instead of wired headsets due to their convenience. Bluetooth headsets are usually provided with antennas to transmit or receive electromagnetic wave energy.

[0003] In the related art, steel sheet antennas are usually used. However, the structural space of Bluetooth headsets is limited. For example, bone conduction headsets have limited space for accommodating antennas. When steel sheet antennas are used, the design space of the antenna is insufficient, resulting in difficulties in antenna design. Utility Model Content

[0004] In order to solve the above problems, the present application provides an FPC antenna structure and a bone conduction headset, aiming to solve the problem that the space of the bone conduction headset is limited, resulting in difficulty in antenna design.

[0005] In a first aspect, the present application provides an FPC antenna structure, which is applied to bone conduction headphones. The FPC antenna structure includes a circuit board, a connecting part, and an FPC antenna; the circuit board includes a circuit board body and a signal transmission circuit arranged on the circuit board body, and the signal transmission circuit is provided with an antenna pin and a ground pin; the connecting part is fixed to the circuit board body and connected to the antenna pin and the ground pin; the FPC antenna abuts against the connecting part and is electrically connected to the antenna pin and the ground pin, and the FPC antenna is used to receive or transmit electromagnetic wave signals.

[0006] Based on the FPC antenna structure provided in the embodiment of the present application, the antenna pin on the signal transmission circuit is used for feeding, the ground pin is used for grounding, and the antenna pin and the ground pin are electrically connected to the FPC antenna through a connecting part. In this way, the FPC antenna adopts the PIFA antenna form, which has a simple structure and low cost. There is no need to set a clearance area, which reduces the design difficulty of the FPC antenna in the bone conduction headset. The antenna performance and anti-interference ability of this form of FPC antenna are strong, which ensures the stability of the FPC antenna structure in transmitting wireless signals.

[0007] In one possible design, the connecting part includes an antenna contact and a grounding contact; one end of the antenna contact is connected to the antenna pin, and the other end of the antenna contact is abutted against the FPC antenna; the grounding contact is arranged adjacent to the antenna contact, and one end of the grounding contact is connected to the grounding pin, and the other end of the grounding contact is abutted against the FPC antenna.

[0008] Based on the above optional method, the antenna pin is electrically connected to the FPC antenna through the antenna contact, and the ground pin is electrically connected to the FPC antenna through the ground contact, so as to realize the electrical connection between the signal transmission circuit and the FPC antenna, thereby ensuring the reliability and stability of the signal transmission between the signal transmission circuit and the FPC antenna.

[0009] In a possible design, the FPC antenna includes a slot line and a feeding portion, the feeding portion is connected to the slot line, and one side of the feeding portion is in contact with the antenna contact and the ground contact.

[0010] In one possible design, the slot line includes a main body and a bending portion, one end of the main body is connected to the feeding portion; one end of the bending portion is connected to the other end of the main body, and the other end of the bending portion is spaced apart from the main body and faces the main body.

[0011] In one possible design, the signal transmission circuit includes a control chip and an inductor, the first end of the control chip is used to receive or output electrical signals, the second end of the control chip and the third end of the control chip are grounded respectively; one end of the inductor is connected to the fourth end of the control chip, and the other end of the inductor is connected to the antenna pin.

[0012] In a possible design, the signal transmission circuit further includes a protection module, one end of the protection module is connected to the other end of the inductor and the antenna pin, and the other end of the protection module is grounded.

[0013] Based on the above optional methods, when the signal transmission circuit or the subsequent circuit is subjected to lightning surge, ESD electrostatic discharge or other transient voltages, the protection module can protect the signal transmission circuit or the subsequent circuit to avoid damage to the signal transmission circuit or the subsequent circuit caused by transient lightning surge, ESD static electricity, etc., so as to ensure the operating reliability of the transmission circuit and the subsequent circuit.

[0014] In a possible design, the protection module is an electrostatic resistor.

[0015] In a possible design, the signal transmission circuit further includes a capacitor, a first plate of the capacitor is connected to one end of the inductor and a fourth end of the control chip, and a second plate of the capacitor is grounded.

[0016] In a second aspect, the present application provides a bone conduction headset, comprising the FPC antenna structure, a first shell and a second shell described in any optional manner of the first aspect; the circuit board is fixed on the first shell; the FPC antenna is fixed on the second shell, the second shell and the first shell constitute a mainboard compartment, and the circuit board is located in the mainboard compartment.

[0017] In one possible design, the first shell includes a first base plate and a first baffle plate arranged around the first base plate, and the second shell includes a second base plate and a second baffle plate arranged around the second base plate. The first baffle plate and the second baffle plate abut against each other to fix the first shell and the second shell in connection to form a mainboard compartment.

[0018] In a possible design, the length of the second shell is 22.11 to 22.41 mm, and the width of the second shell is 12.06 to 12.26 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a bone conduction headset provided in an embodiment of the present application;

[0020] Figure 2 It is a schematic diagram of the exploded structure of a bone conduction headset provided in an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of a top view of a first bottom plate and a second bottom plate provided in an embodiment of the present application;

[0022] Figure 4 is a schematic structural diagram of another bone conduction headset provided in an embodiment of the present application;

[0023] Figure 5 It is a structural schematic diagram of a circuit board provided in an embodiment of the present application;

[0024] Figure 6 It is a structural schematic diagram of an FPC antenna structure provided in an embodiment of the present application;

[0025] Figure 7 It is a schematic diagram of a top view of a bone conduction headset provided in an embodiment of the present application;

[0026] Figure 8 is a circuit structure diagram of a signal transmission circuit provided in an embodiment of the present application;

[0027] Fig. 9 is a circuit structure diagram of another signal transmission circuit provided in an embodiment of the present application;

[0028] Fig.10 It is a schematic diagram of the top structure of a bone conduction headset provided in an embodiment of the present application.

[0029] Among them, the reference numerals in the figure are:

[0030] 1. Bone conduction earphone; 11. First shell; 111. First bottom plate; 1111. First fixing member; 112. First baffle; 12. Second shell; 121. Second bottom plate; 1211. Second fixing member; 122. Second baffle; 13. FPC antenna structure; 131. Circuit board; 1311. Circuit board body; 1312. Signal transmission circuit; 1312A. Antenna pin; 1312B. Ground pin; 132. Connecting part; 1321. Antenna contact; 1322. Ground contact; 133. FPC antenna; 1331. Slot line; 1331A. Main body; 1331B. Bend part; 1332. Feeding part;

[0031] 1A, main board compartment; U, control chip; L, inductor; ESD, electrostatic resistor; C, capacitor; OUT, first end; IN, fourth end; A1, first bending point; A2, second bending point. DETAILED DESCRIPTION

[0032] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, and circuits are omitted to prevent unnecessary details from obstructing the description of the present application.

[0033] At present, Bluetooth headsets are widely used in various fields instead of wired headsets due to their convenience. Bluetooth headsets are usually equipped with antennas, which have the function of transmitting and receiving electromagnetic wave energy, that is, the antenna can effectively convert the energy of high-frequency current into electromagnetic wave energy for transmission, and can also convert the received electromagnetic wave energy into high-frequency current. In order to enable the antenna to achieve better radiation performance, a large routing space is usually required for the antenna in the Bluetooth headset, and because the wireless signal of the antenna is susceptible to interference, in order to avoid interference in the transmission and reception of electromagnetic wave energy by the antenna, thereby affecting the transmission effect of the antenna, and in order to cover the widest possible frequency band and facilitate design, a large clearance area is usually required in the Bluetooth headset to avoid the problem of unstable wireless signal transmission.

[0034] In the related art, a steel sheet antenna is usually used. For example, when a bone conduction headset uses a steel sheet antenna, it is usually necessary to weld the steel sheet to the main board compartment of the bone conduction headset. In order to meet the welding conditions, a certain amount of suspended space needs to be set in the main board compartment. In this way, the design area of ​​the main board compartment is increased, and the structural space of the bone conduction headset is limited, that is, the space for accommodating the antenna is limited. When a steel sheet antenna is used, the design space of the antenna is insufficient, and there is a problem of difficulty in antenna design. In addition, a clearance area is usually required around the antenna, which further increases the difficulty of antenna design.

[0035] To this end, the present application provides a flexible printed circuit (FPC) antenna structure and a bone conduction headset. The FPC antenna structure adopts a planar inverted F (PIFA) antenna form, which has a simple structure and low cost. It does not require a clearance area, which reduces the difficulty of antenna design. The antenna performance and anti-interference ability of this form of FPC antenna are strong, ensuring the stability of the FPC antenna structure in transmitting wireless signals.

[0036] The FPC antenna structure and bone conduction headphones provided in the present application are exemplarily introduced below in conjunction with the accompanying drawings.

[0037] like Figure 1 As shown, the bone conduction earphone 1 provided in the embodiment of the present application may include a first shell 11, a second shell 12 and an FPC antenna structure 13, wherein the first shell 11 and the second shell 12 constitute a mainboard compartment 1A, and the mainboard compartment 1A is used to accommodate the FPC antenna structure 13 and other structures (such as power circuit, charging circuit, audio circuit and other structures).

[0038] Optional, such as Figure 2 As shown, the first housing 11 may include a first bottom plate 111 and a first baffle 112 arranged around the first bottom plate 111, the second housing 12 may include a second bottom plate 121 and a second baffle 122 arranged around the second bottom plate 121, the first baffle 112 and the second baffle 122 are arranged opposite to each other, the first baffle 112 and the second baffle 122 are fixedly connected to form a mainboard compartment 1A, and the FPC antenna structure 13 and other structures are located in the mainboard compartment 1A. Here, it is worth noting that the first housing 11 may also be a box structure with an opening, the second housing 12 may be a cover structure, and the size of the second housing 12 is larger than the size of the opening on the first housing 11, so that the second housing 12 can cover the opening to form the mainboard compartment 1A. The specific structures of the first housing 11 and the second housing 12 can be set according to actual needs. For example, if you want the volume of the mainboard compartment 1A to be larger, you can use a structure consisting of a bottom plate and a baffle; if you want to save manufacturing costs, you can use a structure consisting of a cover and a box body. This application does not make specific restrictions.

[0039] The following is an illustrative description of the bone conduction earphone 1 provided in the present application by taking the example that the first shell 11 includes a first bottom plate 111 and a first baffle 112 arranged around the first bottom plate 111, and the second shell 12 includes a second bottom plate 121 and a second baffle 122 arranged around the second bottom plate 121.

[0040] Optional, such as Figure 3As shown, the first bottom plate 111 and the second bottom plate 121 can be irregular structures suitable for human ears, and the length of the first bottom plate 111 and the second bottom plate 121 can be 22.26 mm (millimeter) ± 0.15 mm, that is, the length can be in the range of 22.11 mm to 22.41 mm, and the width of the first bottom plate 111 and the second bottom plate 121 can be 12.16 mm ± 0.1 mm, that is, the width can be in the range of 12.06 mm to 12.26 mm, that is, the length of the first shell 11 and the second shell 12 is in the range of 22.11 mm to 22.41 mm, and the width of the first shell 11 and the second shell 12 is in the range of 12.06 mm to 12.26 mm. The specific structure and size of the first bottom plate 111 and the second bottom plate 121 can be set according to actual needs, and this application does not make specific restrictions on this.

[0041] In order to further realize the connection between the first housing 11 and the second housing 12, in one example, as Figure 3 As shown, a first fixing member 1111 is provided on the side of the first base plate 111 facing the second base plate 121, and a second fixing member 1211 is provided on the side of the second base plate 121 facing the first base plate 111. The first fixing member 1111 and the second fixing member 1211 are mutually matched structures, for example, one of them is a groove, and the other of them is a protrusion. Assuming that the first fixing member 1111 is a groove and the second fixing member 1211 is a protrusion, during installation, the protrusion is inserted into the groove to achieve the connection between the first shell 11 and the second shell 12, and the connection is strong. The setting position and quantity of the first fixing member 1111 and the second fixing member 1211 can be set according to actual needs. For example, if you want to save production costs, you can only set one first fixing member 1111 and one second fixing member 1211. If you want to further improve the connection strength between the first shell 11 and the second shell 12, as shown in FIG. Figure 3 As shown, three first fixing members 1111 and three second fixing members 1211 may be provided accordingly, and the present application does not impose any specific limitation on this.

[0042] Since the accommodation space of the mainboard compartment 1A formed by the first shell 11 and the second shell 12 is limited, in order to avoid the limited accommodation space, resulting in insufficient design space for the FPC antenna structure 13, there is a problem of difficulty in designing the FPC antenna structure 13. In one example, Figure 4As shown, the FPC antenna structure 13 may include a circuit board 131, a connecting portion 132, and an FPC antenna 133. The circuit board 131 is fixed to the first housing 11 and is located in the mainboard compartment 1A. The FPC antenna 133 is fixed to the second housing 12 to facilitate the inspection and rework of the FPC antenna 133 and improve the convenience of inspection. The connecting portion 132 is fixed to the circuit board 131, and the FPC antenna 133 is in contact with the connecting portion 132, that is, the circuit board 131 can be electrically connected to the FPC antenna 133 through the connecting portion 132 to achieve signal transmission.

[0043] In order to avoid the problem that the limited storage space of the mainboard compartment 1A leads to difficulty in designing the FPC antenna structure 13, the FPC antenna structure 13 can adopt a PIFA antenna FPC antenna 133. The PIFA antenna FPC antenna 133 has a simple structure and does not require a clearance area, thereby reducing the difficulty of antenna design. Figure 5 As shown, the circuit board 131 may include a circuit board body 1311 and a signal transmission circuit 1312 arranged on the circuit board body 1311, the signal transmission circuit 1312 is provided with an antenna pin 1312A and a ground pin 1312B, the connecting portion 132 is fixed on the circuit board body 1311, and is connected to the antenna pin 1312A and the ground pin 1312B, the FPC antenna 133 is abutted against the connecting portion 132, and is electrically connected to the antenna pin 1312A and the ground pin 1312B, and the FPC antenna 133 is used to receive or transmit electromagnetic wave signals. Among them, the signal transmission circuit 1312 is fixed on the first shell 11, and the FPC antenna 133 is fixed on the second shell 12. The antenna pin 1312A on the signal transmission circuit 1312 is used for feeding, and the ground pin 1312B is used for grounding, and the antenna pin 1312A and the ground pin 1312B are electrically connected to the FPC antenna 133 through the connecting part 132. In this way, the FPC antenna 133 adopts the PIFA antenna form, which has a simple structure and low cost. There is no need to set a clearance area, which reduces the design difficulty of the FPC antenna 133 in the mainboard compartment 1A, and the antenna performance and anti-interference ability of this form of FPC antenna 133 are strong, which ensures the stability of the FPC antenna structure 13 in transmitting wireless signals.

[0044] In order to achieve accurate connection between the antenna pin 1312A and the ground pin 1312B and the FPC antenna 133, in one example, Figure 6As shown, the connection portion 132 may include an antenna contact 1321 and a grounding contact 1322, one end of the antenna contact 1321 is correspondingly connected to the antenna pin 1312A, and the other end of the antenna contact 1321 is in contact with the FPC antenna 133, the grounding contact 1322 is arranged adjacent to the antenna contact 1321, and one end of the grounding contact 1322 is correspondingly connected to the grounding pin 1312B, and the other end of the grounding contact 1322 is in contact with the FPC antenna 133. In this way, the antenna pin 1312A is electrically connected to the FPC antenna 133 through the antenna contact 1321, and the grounding pin 1312B is electrically connected to the FPC antenna 133 through the grounding contact 1322, so as to realize the electrical connection between the signal transmission circuit 1312 and the FPC antenna 133, thereby ensuring the reliability and stability of the signal transmission between the signal transmission circuit 1312 and the FPC antenna 133.

[0045] Optional, such as Figure 7 As shown, assuming that the first bottom plate 111 and the second bottom plate 121 are the irregular structures suitable for human ears, the circuit board body 1311 is fixed to the first bottom plate 111, the FPC antenna 133 is fixed to the second bottom plate 121, and the antenna contact 1321, the antenna pin 1312A, the grounding contact 1322, the grounding pin 1312B and the FPC antenna 133 can be arranged as shown in FIG. Figure 7 As shown, when the first base plate 111 and the second base plate 121 are relatively fixed, the antenna contact 1321 and the grounding contact 1322 will abut against the FPC antenna 133. The specific setting positions of the antenna contact 1321, the grounding contact 1322 and the FPC antenna 133 can also be set according to actual needs, and this application does not make specific restrictions on this.

[0046] In one example, if Figure 8 As shown, the signal transmission circuit 1312 may include a control chip U and an inductor L, wherein a first terminal OUT of the control chip U is used to receive or output an electrical signal, a second terminal of the control chip U and a third terminal of the control chip U are grounded respectively, one terminal of the inductor L is connected to a fourth terminal IN of the control chip U, and the other terminal of the inductor L is connected to an antenna pin 1312A, as shown in FIG. Figure 8 As shown, the ground pin 1312B is an independent ground pin. In this example, when the signal transmission circuit 1312 needs to send an electrical signal, the first terminal OUT of the control chip U receives the electrical signal, and outputs it to the inductor L through the fourth terminal IN until the antenna pin 1312A; when the signal transmission circuit 1312 needs to receive an electrical signal, the electrical signal output by the antenna pin 1312A is connected to the fourth terminal IN of the control chip U through the inductor L, and then outputs the electrical signal to the subsequent circuit through the first terminal OUT of the control chip U.

[0047] Optionally, the control chip U may be a chip of model LFB182G455G9A272, or a chip of other models, and this application does not impose any specific restrictions on this.

[0048] When the signal transmission circuit 1312 is working, a surge voltage may be generated. In order to prevent the surge voltage from damaging the signal transmission circuit 1312 and the subsequent circuit, in one example, the signal transmission circuit 1312 also includes a protection module, one end of the protection module is connected to the other end of the inductor L and the antenna pin 1312A, and the other end of the protection module is grounded. When the signal transmission circuit 1312 or the subsequent circuit is subjected to a lightning surge, ESD electrostatic discharge, or other transient voltage, the protection module can protect the signal transmission circuit 1312 or the subsequent circuit to prevent transient lightning surges, ESD static electricity, etc. from damaging the signal transmission circuit 1312 or the subsequent circuit, so as to ensure the operational reliability of the transmission circuit 1312 and the subsequent circuit.

[0049] like Fig. 9 As shown, the protection module may be an electrostatic resistor (ESD), one end of the electrostatic resistor ESD is connected to the other end of the inductor L and the antenna pin 1312A, and the other end of the electrostatic resistor ESD is grounded.

[0050] In one example, if Fig. 9 As shown, the signal transmission circuit 1312 may further include a capacitor C, a first plate of the capacitor C is connected to one end of the inductor L and a fourth end IN of the control chip U, and a second plate of the capacitor C is grounded.

[0051] In one example, if Fig.10 As shown, the FPC antenna 133 may include a slot line 1331 and a feeding portion 1332, the feeding portion 1332 is connected to the slot line 1331, and one side of the feeding portion 1332 is in contact with the antenna contact 1321 and the ground contact 1322. Fig.10 As shown, the slot line 1331 may include a main body 1331A and a bending portion 1331B, one end of the main body 1331A is connected to the feeding portion 1332, one end of the bending portion 1331B is connected to the other end of the main body 1331A, and the other end of the bending portion 1331B is spaced apart from the main body 1331A and faces the main body 1331A. By partially setting the slot line 1331 as the bending portion 1331B, the integration of the slot line 1331 is improved and the design space is saved.

[0052] In this example, the bending portion 1331B may include a plurality of bending points, for example, Fig.10As shown, the bending portion 1331B can be provided with two bending points, namely the first bending point A1 and the second bending point A2. The bending points of the bending portion 1331B can be specifically set according to actual needs, and this application does not make any specific restrictions on this.

[0053] Here, it is worth noting that there is a correlation between the frequency ID, frequency, antenna gain and efficiency of the FPC antenna 133 provided in the present application. Taking the frequency ID as 1, 2, 3, 4, 5, 6, 7, 8 and 9 as an example, the corresponding relationship table of the frequency ID, frequency, antenna gain and efficiency of the FPC antenna 133 can be as follows: Table 1:

[0054]

[0055] Table 1

[0056] In summary, the FPC antenna 133 in the bone conduction headset 1 provided in the present application adopts the PIFA antenna form, which has a simple structure and low cost. There is no need to set a clearance area, which reduces the design difficulty of the FPC antenna 133 in the motherboard compartment 1A. The antenna performance and anti-interference ability of this form of FPC antenna 133 are strong, ensuring the stability of the FPC antenna structure 13 in transmitting wireless signals.

[0057] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0058] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0059] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0060] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0061] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An FPC antenna structure, applied to bone conduction headphones, characterized in that: include: A circuit board, comprising a circuit board body and a signal transmission circuit arranged on the circuit board body, wherein the signal transmission circuit is provided with an antenna pin and a ground pin; a connecting portion, the connecting portion being fixed to the circuit board body and connected to the antenna pin and the ground pin; and, An FPC antenna is abutted against the connecting portion and is electrically connected to the antenna pin and the ground pin. The FPC antenna is used to receive or transmit electromagnetic wave signals.

2. The FPC antenna structure according to claim 1, characterized in that: The connecting portion comprises: an antenna contact, one end of which is connected to the antenna pin correspondingly, and the other end of which is in contact with the FPC antenna; and A grounding contact is disposed adjacent to the antenna contact, one end of the grounding contact is correspondingly connected to the grounding pin, and the other end of the grounding contact is in contact with the FPC antenna.

3. The FPC antenna structure according to claim 2, characterized in that: The FPC antenna comprises: slot lines; and, A feeding part is connected to the slot line, and one side of the feeding part abuts against the antenna contact and the ground contact.

4. The FPC antenna structure according to claim 3, characterized in that: The slot line comprises: a main body, one end of which is connected to the feeding part; and A bending portion, one end of which is connected to the other end of the main body, and the other end of the bending portion is spaced apart from the main body and faces the main body.

5. The FPC antenna structure according to any one of claims 1 to 4, characterized in that: The signal transmission circuit comprises: a control chip, wherein a first end of the control chip is used to receive or output an electrical signal, and a second end of the control chip and a third end of the control chip are grounded respectively; and An inductor, one end of the inductor is connected to the fourth end of the control chip, and the other end of the inductor is connected to the antenna pin.

6. The FPC antenna structure according to claim 5, characterized in that: The signal transmission circuit further includes: A protection module, one end of which is connected to the other end of the inductor and the antenna pin, and the other end of the protection module is grounded.

7. The FPC antenna structure according to claim 6, characterized in that: The protection module is an electrostatic resistor.

8. The FPC antenna structure according to claim 5, characterized in that: The signal transmission circuit further includes: A capacitor, wherein a first plate of the capacitor is connected to one end of the inductor and a fourth end of the control chip, and a second plate of the capacitor is grounded.

9. A bone conduction headset, characterized in that: include: The FPC antenna structure according to any one of claims 1 to 8; a first housing, the circuit board being fixed on the first housing; as well as, A second shell, the FPC antenna is fixed on the second shell, the second shell and the first shell constitute a mainboard compartment, and the circuit board is located in the mainboard compartment.

10. The bone conduction earphone according to claim 9, characterized in that: The first shell includes a first bottom plate and a first baffle plate arranged around the first bottom plate, and the second shell includes a second bottom plate and a second baffle plate arranged around the second bottom plate. The first baffle plate and the second baffle plate abut against each other so that the first shell and the second shell are fixedly connected to form a mainboard compartment.

11. The bone conduction earphone according to claim 9, characterized in that: The length of the second shell is 22.11-22.41 mm, and the width of the second shell is 12.06-12.26 mm.

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