Headband earphone

Abstract

The utility model relates to the technical field of electronic equipment, and discloses a headphone, which comprises an ear shell and a wireless communication assembly, and the wireless communication assembly is arranged in the ear shell. The wireless communication assembly comprises a printed circuit board assembly and an antenna, the antenna is electrically connected with the printed circuit board assembly, and the wireless communication assembly is used for receiving, processing and sending signals; the antenna comprises a radiation unit used for generating and radiating electromagnetic waves, the radiation unit is of a flexible printed circuit board structure, and the radiation unit is attached to the edge of the earphone shell; one end of the feed unit is connected with the radiation unit, and the other end of the feed unit is assembled and connected with the printed circuit board; and the connecting unit is connected between the radiating unit and the ear shell and is used for connecting the radiating unit along the edge of the ear shell in an attached manner. The headband earphone has the advantages that the signal transmission quality is guaranteed, meanwhile, full-space coverage is achieved, and the headband earphone is adaptive to the compact space layout.

Description

Technical Field

[0001] This application belongs to the field of electronic equipment technology, and specifically relates to a headband-style headphone. Background Technology

[0002] With the popularization of wireless audio technology, headphones have become the mainstream choice in the consumer electronics market due to their comfortable wearing experience and excellent sound quality.

[0003] Most headphones currently on the market use stainless steel antennas as their signal transmission components. While these antennas exhibit good signal directionality at specific angles, their radiation patterns have significant directional limitations, failing to achieve uniform coverage across the entire space. In actual use, when the user's head rotates or the headphone position changes, signal strength often drops sharply or even drops completely, severely impacting audio transmission stability and user experience.

[0004] On the other hand, while omnidirectional antennas can provide all-around signal coverage, their traditional large size makes them difficult to fit into the compact space required inside headband headphones. Existing omnidirectional antennas often face technical bottlenecks during miniaturization, such as decreased radiation efficiency and impedance matching difficulties, preventing their direct application in the mass production of headband headphones. Furthermore, as wearable devices, headband headphones also require consideration of electromagnetic compatibility between the antenna and the human head, further increasing the complexity of antenna design.

[0005] In existing technologies, both directional metal antennas and traditional omnidirectional antennas have significant technical limitations when applied to headband headphones: the former cannot meet the requirements for full-space coverage, while the latter is difficult to miniaturize and integrate. This technical contradiction severely restricts the improvement of wireless transmission performance in headband headphones, necessitating the development of new antenna structure designs that can perfectly adapt to the limited space requirements of headband headphones while ensuring signal transmission quality.

[0006] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0007] To address the shortcomings of the prior art, this application provides a headband-style headset that offers the advantages of ensuring signal transmission quality while achieving full spatial coverage and adapting to the compact spatial layout of headband-style headsets.

[0008] The technical effects to be achieved in this application are realized through the following aspects:

[0009] This application provides a headband-style headset, including...

[0010] It includes an ear shell and a wireless communication component, wherein the wireless communication component is disposed inside the ear shell;

[0011] The wireless communication component includes a printed circuit board assembly and an antenna, the antenna being electrically connected to the printed circuit board assembly, and the wireless communication component being used to perform signal reception, processing, and transmission functions.

[0012] The antenna includes:

[0013] A radiating unit for generating and radiating electromagnetic waves, wherein the radiating unit is a flexible printed circuit board structure and is attached to the edge of the ear shell;

[0014] A power supply unit, one end of which is connected to the radiating unit, and the other end of which is assembled and connected to the printed circuit board; and

[0015] A connecting unit is provided between the radiating unit and the ear shell, for attaching the radiating unit along the edge of the ear shell.

[0016] In some implementations, the radiating element is formed by a plurality of straight portions and a plurality of curved portions.

[0017] In some implementations, the power supply unit includes a coaxial line and a fixing part, the fixing part being connected to the end of the coaxial line away from the radiating unit and being assembled with the printed circuit board.

[0018] In some implementations, the coaxial cable has a signal terminal and a ground terminal at the end away from the fixing part; the signal terminal and the ground terminal are respectively connected to the radiation unit, and the ground terminal is located between the signal terminal and the fixing part, and is located close to the signal terminal.

[0019] In some implementations, a UV adhesive layer is provided between the signal terminal, the ground terminal, and the radiating unit.

[0020] In some implementations, the fixing part includes a matching metal pin and a socket, the metal pin being connected to the power supply unit, the socket being disposed on the printed circuit board assembly, and the metal pin being inserted into the socket.

[0021] In some implementations, the length of the radiating element is 24.45mm-24.75mm.

[0022] In some implementations, the width of the radiating element is 16.25mm-24.90mm.

[0023] In some implementations, the connecting unit is provided with a first adhesive surface and a second adhesive surface opposite to each other, the first adhesive surface is bonded to the radiating unit, and the second adhesive surface is bonded to the auricle.

[0024] In some implementations, the connecting unit is a structure formed with 3M adhesive backing.

[0025] In summary, this application has at least the following advantages:

[0026] The headband headphones provided in this application include an ear shell and a wireless communication component, with the wireless communication component located inside the ear shell. The wireless communication component includes a printed circuit board assembly and an antenna, which is attached to the edge of the ear shell through a radiating unit of a flexible printed circuit board structure. Combined with the layout design of the power supply unit and the connection unit, it achieves full-space signal coverage while adapting to the compact spatial layout of the headband headphones. It has the advantages of achieving full-space coverage and adapting to the compact spatial layout of the headband headphones while ensuring signal transmission quality. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the assembly structure of the ear shell and the wireless communication component in Embodiment 1 of this application.

[0028] Figure 2 This is a schematic diagram of the antenna structure in Embodiment 1 of this application.

[0029] Figure 3 This is a 2D radiation pattern of an antenna head model employing metal antenna technology.

[0030] Figure 4 This is a 2D radiation pattern of an antenna head model using flexible printed circuit board structure technology.

[0031] Figure 5 This is a comparison image of a 3D apple-shaped antenna head model using metal antenna technology and flexible printed circuit board structure technology in Embodiment 1 of this application.

[0032] Figure 6 This is a Smith circle comparison diagram of the metal antenna technology and the flexible printed circuit board structure technology used in Embodiment 1 of this application.

[0033] Figure 7 This is a comparison chart of the S11 logarithmic amplitude curves of metal antenna technology and flexible printed circuit board structure technology used in Embodiment 1 of this application.

[0034] Figure 8 This is a comparison chart of the standing wave ratio curves of metal antenna technology and flexible printed circuit board structure technology used in Embodiment 1 of this application.

[0035] Figure 9 This is a schematic diagram of the antenna structure in Embodiment 2 of this application.

[0036] Marked in the image:

[0037] 100. Ear shell; 200. Wireless communication component; 1. Printed circuit board assembly; 2. Antenna; 21. Radiation unit; 211. Straight section; 212. Bending section; 22. Feeding unit; 221. Coaxial cable; 222. Fixing section; 223. Signal terminal; 224. Grounding terminal; 225. UV adhesive layer. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, not all embodiments.

[0039] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0040] Example 1:

[0041] Please see the appendix Figure 1-2 This application proposes a headband headphone including an ear shell 100 and a wireless communication component 200, wherein the wireless communication component 200 is disposed inside the ear shell 100; the wireless communication component 200 includes a printed circuit board assembly 1 and an antenna 2, the antenna 2 being electrically connected to the printed circuit board assembly 1; the antenna 2 includes a radiating element 21 with a flexible printed circuit board structure, the radiating element 21 being attached to the edge of the ear shell 100, a feeding unit 22 connecting the radiating element 21 to the printed circuit board assembly 1, and a connecting unit fixing the radiating element 21 along the edge of the ear shell 100.

[0042] Among them, the radiation unit 21 refers to the circuit structure made of flexible substrate, which can be realized by using a polyimide substrate in conjunction with copper foil etching process. By adapting the curved shape to the ear shell 100, a multi-directional radiation path is formed in a limited space.

[0043] The power supply unit 22 refers to the signal transmission medium, which can be implemented by using a coaxial cable 221 with metal plug terminals, reducing signal transmission loss through direct connection.

[0044] The connecting unit refers to the fixing component, which can be achieved by using double-sided tape or hot melt adhesive layer. The adhesive effect ensures that the radiating unit 21 fits tightly against the edge of the ear shell 100.

[0045] Specifically, the wireless communication component 200 is integrated inside the earcup 100, centralizing signal reception, processing, and transmission functions. The flexible radiating unit 21 is bent and attached along the edge of the earcup 100, its physical shape naturally matching the curved surface of the earphone, avoiding compression of the internal space. One end of the power supply unit 22 is connected to the radiating unit 21 by soldering or plugging, and the other end is connected to a preset interface of the printed circuit board assembly 1, forming the shortest signal transmission path. The double-sided adhesive structure of the connecting unit firmly fixes the radiating unit 21 in the predetermined position of the earcup 100, avoiding signal fluctuations caused by displacement during use.

[0046] Through the above technical solution, this solution directly fits the edge of the ear shell 100 with a flexible circuit structure, saving space and achieving multi-directional radiation. While maintaining the compact structure of the headband headphones, it eliminates the signal dead zones present in traditional antennas 2, allowing electromagnetic waves to uniformly cover the surrounding space; the flexible radiation unit 21 naturally fits the curved surface of the ear shell 100, avoiding the limitations imposed by rigid components on the headphone's industrial design; the coordinated design of the power supply unit 22 and the connection unit ensures signal transmission stability and solves the technical defect of signal interruption in motion scenarios.

[0047] This application further proposes that the radiating element 21 is formed by a plurality of straight portions 211 and a plurality of curved portions 212.

[0048] The straight section 211 refers to a straight conductive structure extending in a specific direction, which can be implemented using rectangular or strip-shaped traces in a flexible printed circuit board. Its current distribution is uniform, forming a symmetrical radiation field. The curved section 212 refers to a conductive structure with an arc or zigzag shape, which can be implemented using L-shaped, U-shaped, or spiral traces. Its altered current path generates a more directional radiation field. When these two structures are arranged alternately, their complementary radiation characteristics can be achieved through differences in geometry, while simultaneously matching the curved contour of the ear shell 100 edge.

[0049] Specifically, the straight section 211 establishes a basic radiation path during electromagnetic wave radiation, and its symmetrical current distribution allows energy to diffuse along the vertical direction, forming a basic signal field with stable coverage. The curved section 212, through local reversals in the current direction, forms a superimposed magnetic field strength in a specific direction, enhancing the signal coverage strength in that direction. When the straight section 211 and the curved section 212 are connected in series, the effective electrical length of the radiation unit 21 increases, but the overall space occupancy remains compact. This not only conforms to the curvature of the ear shell 100 but also forms a multi-directional coordinated electromagnetic wave diffusion mode through the superposition of radiation characteristics at different locations. For example, by setting the straight section 211 on the straight section at the top of the ear shell 100 and configuring the curved section 212 at the corner of the ear shell 100, the continuity of the antenna 2 structure is maintained, and the radiation field becomes more directional in the corner region.

[0050] Through the above technical solution, this application solves the balance problem between the directional limitation of rigid antennas and the spatial conflict of omnidirectional antennas. The alternating arrangement of the straight portion 211 and the curved portion 212 allows the radiating element 21 to conform to the complex shape of the ear shell 100 edge, while generating a multi-directional superimposed radiation field, eliminating dead zones caused by signal attenuation in a single direction. The local directional enhancement characteristics of the curved portion 212 can compensate for the signal in the area behind the ear that is easily blocked when the headphones are worn, while the straight portion 211 maintains stable coverage of the main body area of ​​the ear shell 100, thereby achieving an omnidirectional equivalent radiation effect in a compact space.

[0051] To more intuitively demonstrate the innovative advantages of this utility model's technical solution, in conjunction with the appendix... Figure 3 With appendix Figure 4 A comparative explanation is provided. (Attached) Figure 3 The diagram shows a 2D radiation pattern of an antenna head model using a metal antenna as the signal transmission component, based on existing technology. (Attached) Figure 4 This invention uses a flexible printed circuit board structure as the antenna head model 2D radiation pattern for the radiating element 21.

[0052] A comparison clearly reveals that, in terms of the shape of the radiation pattern, the attached... Figure 3 The antenna pattern is relatively irregular in shape, with a relatively large number of side lobes and large amplitudes, indicating that the antenna also radiates a lot of energy in non-main radiation directions. This not only wastes energy but may also interfere with other devices.

[0053] Appendix Figure 4 The radiation pattern of the improved antenna 2 is more regular, the main lobe is more prominent, and the amplitude of the side lobes is significantly reduced. This indicates that the energy of the improved antenna 2 is more concentrated in the main radiation direction, reducing energy waste and interference in non-main directions, and improving the directional radiation capability of antenna 2.

[0054] Regarding the distribution of radiation intensity, the appendix Figure 3 The radiation intensity fluctuates in different directions, with relatively high intensity in some directions and low intensity in others. However, the overall distribution does not show a clear dominant direction, which may indicate energy dispersion. For example, at some angles, the radiation intensity attenuates rapidly, which is not conducive to long-distance signal transmission in specific directions.

[0055] Appendix Figure 4 The radiation intensity of the antenna 2 head mode pattern is significantly enhanced in certain directions, such as the main radiation direction, where the radiation intensity is improved compared to existing technologies. This means that the improved antenna 2 can radiate energy more effectively in specific directions, potentially resulting in longer signal transmission distances and higher quality signals.

[0056] In terms of stability, attached Figure 3 The large fluctuations in the radiation pattern at different angles indicate that the antenna performance is greatly affected by changes in direction and its stability is poor.

[0057] Appendix Figure 4 The antenna head mode radiation pattern changes relatively smoothly at different angles, indicating that the improved antenna has more stable performance in different directions, is less affected by angle changes, and can transmit and receive signals more stably.

[0058] Additionally, please see Figure 5 Figure 5A shows a 3D image of an antenna head using a metal antenna as the signal transmission component, and Figure 5B shows a 3D image of an antenna head using a flexible printed circuit board structure as the radiating element. In the figures, the redder the area, the better the effect; blue and green are relatively worse than red.

[0059] Combined with appendix Figure 5 Further analysis reveals that, from the perspective of overall shape and symmetry, the 3D radiation pattern of 5A in the figure is relatively irregular, with significant differences in the degree of extension in different directions, lacking obvious geometric symmetry. This indicates that the radiation characteristics of the metal antenna vary considerably in different directions, resulting in uneven spatial distribution of signal radiation. In contrast, the shape of 5B in the figure is closer to a sphere, exhibiting relatively good symmetry, indicating that the antenna with the flexible printed circuit board structure has more balanced radiation characteristics in all directions, resulting in relatively uniform signal radiation.

[0060] Analyzing from the perspective of gain distribution, in the color distribution of 5A in the figure, the high-gain region (red part) is concentrated in certain specific directions, while the gain decreases rapidly in other directions (with more low-gain regions such as green). This means that the metal antenna has strong signal radiation capability in specific directions, but weak radiation capability in other directions, with a large gain gradient. In contrast, the high-gain region (red) in 5B is more widely and continuously distributed, while the low-gain regions (green, etc.) are relatively fewer. This indicates that the antenna has a higher overall gain level, and the gain change in different directions is relatively gradual, resulting in a more stable signal strength distribution in space.

[0061] Analyzing from the perspective of main lobe and side lobe characteristics, the main lobe of antenna 5A is not unique and is relatively dispersed, with multiple directions exhibiting relatively high radiation intensity. Simultaneously, the side lobes are relatively prominent, and some side lobe regions also show high gain. This may lead to signal energy dispersion and susceptibility to interference in non-main lobe directions. In contrast, the main lobe of antenna 5B is concentrated, with signal energy primarily focused in a few specific directions. The side lobes are relatively weak, indicating that this antenna has better directivity, enabling it to concentrate signal transmission in the main directions and reduce energy waste and interference.

[0062] Therefore, in terms of radiation characteristics, the 5B exhibits more uniform radiation, better gain stability, and smaller signal intensity fluctuations in different directions. In terms of directivity, its main lobe is concentrated, its side lobes are weak, and energy can be effectively concentrated for transmission, resulting in strong anti-interference capabilities. Based on these advantages, the 5B is more adaptable to scenarios with high requirements for signal uniformity and directivity, demonstrating a significant advantage over the 5A.

[0063] To further demonstrate the innovative advantages of this utility model's technical solution, the Smith circle, S11 logarithmic amplitude curve, and VSWR curve of two different antennas—one using a metal antenna and the other using a flexible printed circuit board antenna—were compared, and the results were as follows:

[0064] Please see Figure 6 6A is the Smith chart with a metal antenna, and 6B is the Smith chart with a flexible printed circuit board structure.

[0065] Combined with appendix Figure 6 Specifically, Figure 6 The Smith chart trajectory of the 6A antenna is relatively complex, indicating that the complex reflection coefficient of the metal antenna varies greatly at different frequencies. The varying degrees of deviation of the trajectory from the center suggest significant differences in impedance matching at certain frequency points, potentially indicating substantial reflections at some frequencies. Figure 6 The relatively compact trajectory of the 6B antenna indicates that its complex reflection coefficient varies less across different frequencies. Compared to metal antennas, it exhibits more stable overall impedance matching and a narrower range of reflection coefficient fluctuation. Therefore, the flexible printed circuit board structure, with its relatively small variation in complex reflection coefficient across different frequencies, is more stable than metal antennas, resulting in more stable overall impedance matching and a narrower range of reflection coefficient fluctuation, effectively reducing signal reflection.

[0066] Please see Figure 7 7A is the S11 logarithmic amplitude curve using metal antenna 2, and 7B is the S11 logarithmic amplitude curve using flexible printed circuit board structure.

[0067] Combined with appendix Figure 7 Specifically, Figure 7 The values ​​of S11 in the 7A antenna vary greatly at different frequencies. For example, the S11 values ​​differ significantly at the marked frequencies, indicating that the signal reflection of the metal antenna fluctuates greatly at different frequencies, with severe reflection at some frequencies and unstable transmission efficiency. Figure 7 The curve of antenna 7B is relatively smooth, and the S11 value varies little at different frequency points, indicating that antenna 2 has a relatively stable signal reflection degree and small transmission efficiency fluctuation over a wide frequency range, and can maintain good performance over a wider frequency band. Therefore, the use of a flexible printed circuit board structure to ensure stable signal reflection degree and small transmission efficiency fluctuation over a wide frequency range is beneficial to ensuring communication quality and stability.

[0068] Please see Figure 8 8A is the VSWR curve using a metal antenna, and 8B is the VSWR curve using a flexible printed circuit board structure.

[0069] Combined with appendix Figure 8 Specifically, Figure 8The VSWR curve of the Zhong8A antenna fluctuates significantly, with substantial differences in VSWR values ​​at different frequencies. This indicates that the impedance matching of the metal antenna is uneven across different frequencies, with high VSWRs and poor matching at some frequencies. Figure 8 The VSWR curve of the 8B is relatively flat, and the VSWR value varies little across different frequencies. This indicates that the impedance matching of the flexible printed circuit board antenna is relatively uniform throughout the entire test frequency band, effectively reducing signal reflection and improving transmission performance. Therefore, the relatively flat VSWR curve and small variation in VSWR value across different frequencies, along with the relatively uniform impedance matching throughout the entire test frequency band, effectively reduce signal reflection, thereby improving transmission performance and ensuring efficient and stable signal transmission.

[0070] From the above appendix Figure 6-8 It can be seen that the use of flexible printed circuit board structure can achieve excellent impedance matching performance and stable and efficient signal transmission.

[0071] Furthermore, to further demonstrate the innovative advantages of this utility model's technical solution, a comparative analysis of the antenna gain table and the OTA test data table is presented, as follows:

[0072] Please refer to Table 1 for a comparison of antenna gains in the antenna free state.

[0073] Table 1: Comparison of antenna gain between metal antennas and flexible printed circuit board structures in antenna free state.

[0074]

[0075]

[0076] The comparative analysis in Table 1 clearly shows that the efficiency of metal antennas is mostly around 56%-58% at various frequencies, with relatively small fluctuations. In contrast, the efficiency of flexible printed circuit board (PCB) antennas ranges from 52% to 61%, with slightly larger fluctuations, and at some frequencies (such as 2400MHz and 2410MHz), the efficiency is significantly higher than that of metal antennas. Overall, flexible PCB antennas have an efficiency advantage in free space. Furthermore, metal antennas have high gain, limiting chip power and resulting in poor omnidirectional radiation. Flexible PCB antennas, on the other hand, have low gain, allowing for increased chip power and better omnidirectional radiation. This indicates that flexible PCB antennas have a much stronger signal amplification capability in free space than metal antennas, making them suitable for omnidirectional coverage.

[0077] Please refer to Table 2 for OTA test data using a flexible printed circuit board structure.

[0078] Table 2: OTA Test Data Table of the Technical Solution of this Application

[0079]

[0080] As can be seen from the data in the table above, the total radiated power varies under different channels. For example, in the free state, the total radiated power of channel 0 is 6.64, while that of channel 39 becomes 7.21, and that of channel 78 is 7.42. These values ​​also differ significantly from the total radiated power values ​​of the corresponding channels in the head-mode state. This indicates that the flexible printed circuit board structure antenna can accurately sense changes in radiated power under different channel settings and environments (free and head-mode). Regarding the total omnidirectional sensitivity, the values ​​vary across different channels. For instance, in the free state, the total omnidirectional sensitivity of channel 0 is -91.37, while that of channel 39 is -90.66. Furthermore, the total omnidirectional sensitivity values ​​of the same channel differ between the free and head-mode states. The flexible printed circuit board structure antenna can accurately reflect these changes, demonstrating its ability to sensitively capture changes in signal reception sensitivity under different channels and environments. In summary, the flexible printed circuit board structure antenna exhibits a fine response to different channel settings and environmental changes in radiated power and signal reception sensitivity measurements, fully demonstrating its excellent sensitivity.

[0081] Example 2:

[0082] The difference between this embodiment and Embodiment 1 is that, please refer to... Figure 9 This application further proposes that the power supply unit 22 includes a coaxial line 221 and a fixing part 222, the fixing part 222 being connected to the end of the coaxial line 221 away from the radiating unit 21 and connected to the printed circuit board assembly 1.

[0083] The coaxial cable 221 refers to a cable structure with a central conductor and an outer shielding layer. Specifically, it can be implemented using copper core wires wrapped with multiple layers of insulating material, used to carry high-frequency signal transmission and suppress electromagnetic interference. The fixing part 222 refers to the connecting component that achieves mechanical fixation. Specifically, it can be implemented using a plug-in structure with metal pins and sockets, establishing a rigid connection between the coaxial cable 221 and the printed circuit board assembly 1 through physical engagement.

[0084] Specifically, the coaxial cable 221 forms a flexible wiring channel between the radiating unit 21 and the printed circuit board assembly 1, and its bending characteristics can adapt to the curved surface fit requirements of the ear shell 100. The fixing part 222 is located at the end of the coaxial cable 221, and forms a solderless physical connection with the printed circuit board assembly 1 through a plug-in structure, avoiding the risk of solder joint breakage due to vibration when wearing the headphones. During the assembly process, the coaxial cable 221 can freely adjust its direction with the radiating unit 21, while the fixing part 222 is locked in a preset position on the printed circuit board assembly 1 through a plug-in method, realizing the coordinated cooperation of flexible wiring and rigid connection.

[0085] Through the above technical solution, this application achieves a reliable connection between the power supply unit 22 and the circuit board assembly under the condition of limited internal space of the headband headphones, avoiding connection failure caused by vibration, while taking into account both wiring flexibility and assembly compactness through the split structure design.

[0086] This application further proposes that the coaxial cable 221 is provided with a signal terminal 223 and a ground terminal 224 at one end away from the fixed part 222. The signal terminal 223 and the ground terminal 224 are respectively connected to the radiation unit 21. The ground terminal 224 is located between the signal terminal 223 and the fixed part 222, and is located close to the signal terminal 223.

[0087] Among them, the signal terminal 223 refers to the conductive contact point used to carry radio frequency signal transmission. Specifically, it can be implemented by copper foil gold-plated contact, which directly forms an electrical path with the radiation unit 21 to transmit high frequency signals.

[0088] Among them, the grounding terminal 224 refers to the conductive contact point connected to the grounding loop. Specifically, it can be implemented using a ring-shaped copper foil structure. Its layout adjacent to the signal terminal 223 forms an encircling grounding path to shield electromagnetic interference.

[0089] The spacing between the signal terminal 223 and the ground terminal 224 refers to the physical distance between the two contact points. Specifically, it can be achieved by adjusting the stripping length between the core wire at the end of the coaxial cable 221 and the shielding layer. This distance is controlled within the minimum distance range that meets impedance matching requirements.

[0090] Specifically, signal terminal 223 forms a point-to-point radio frequency transmission channel with radiating unit 21 through coaxial cable 221, and ground terminal 224 forms a closed ground loop with radiating unit 21 through coaxial cable 221 shielding layer. Ground terminal 224 is positioned at a specific location between signal terminal 223 and fixing part 222, shortening the ground path length to less than one-quarter of the signal wavelength, thereby eliminating phase shift caused by path delay. The capacitive coupling effect formed between signal terminal 223 and ground terminal 224 can cancel the distributed inductance of the transmission line, achieving automatic matching between the transmission line impedance and the input impedance of radiating unit 21.

[0091] This solution achieves physical isolation between the RF signal transmission path and the grounding loop by independently separating the signal terminal 223 and the grounding terminal 224 and defining their relative positions. This enables the high-frequency signal to form a directional electromagnetic field distribution during transmission, reduces energy reflection loss caused by impedance mismatch, suppresses electromagnetic crosstalk during high-frequency signal transmission, and improves the radiation efficiency and signal transmission stability of antenna 2. At the same time, the compact layout of the grounding loop suppresses common-mode interference.

[0092] This application further proposes a technical solution in which a UV adhesive layer 225 is provided between the signal terminal 223, the ground terminal 224 and the radiation unit 21.

[0093] The UV adhesive layer 225 refers to an adhesive layer that cures under ultraviolet light, specifically using an acrylic photosensitive resin material, which forms an insulating protective layer after curing. The signal terminal 223 refers to a conductor contact point used to transmit high-frequency electrical signals, specifically using a metal pad or conductive copper foil structure, serving as the physical interface for current transmission. The ground terminal 224 refers to a grounding conductor contact point used to provide a reference potential, specifically using a metallized via structure on the same layer as the signal terminal 223, serving as electromagnetic shielding and signal return. The radiating unit 21 refers to an electromagnetic wave emitting structure composed of a flexible substrate and conductive lines, specifically using a serpentine trace structure formed by etching copper foil onto a polyimide substrate, possessing bending deformation capability.

[0094] Specifically, a UV adhesive layer 225 is coated between the contact interface of the signal terminal 223 and the radiating unit 21, and between the contact interface of the ground terminal 224 and the radiating unit 21. When the adhesive layer is irradiated by an ultraviolet light source, the liquid resin undergoes a polymerization reaction to form a solid adhesive layer, physically fixing the conductor contact points in the signal transmission path. This curing process is completed at room temperature, avoiding the problem of thermal expansion differences in metal materials caused by high-temperature welding. The elastomer formed after the adhesive layer cures can elastically expand and contract with the deformation of the ear shell 100, thereby offsetting the shearing effect of mechanical stress generated during wearing on the conductor contact surface. The insulating properties of the adhesive layer prevent direct contact between adjacent conductors, preventing leakage current during high-frequency signal transmission.

[0095] Through the above technical solution, this application solves the problem of poor contact at conductor connection points caused by vibration, eliminating the risk of intermittent open circuits in the signal transmission path. The insulating properties of the adhesive layer block possible arc discharge between adjacent conductors, ensuring the integrity of high-frequency signal transmission. The deformation-following property of the adhesive structure maintains a tight fit between the conductor contact surfaces, enabling the antenna 2 to maintain stable impedance matching characteristics even under repeated bending of the earphone.

[0096] This application further proposes that the fixing part 222 includes a matching metal pin and a socket, the metal pin is connected to the power supply unit 22, the socket is provided on the printed circuit board assembly 1, and the metal pin is inserted into the socket.

[0097] The metal pin is a rigid conductive component used to conduct electrical signals, typically made of copper alloy, with its surface plated with gold to improve conductivity. The socket is a conductive interface that mechanically matches the metal pin, typically implemented using a flexible contact plate structure, which can be two symmetrically distributed arc-shaped copper plates. The fit refers to the interference fit between the outer diameter of the metal pin and the inner diameter of the socket; the interference can be controlled within the range of 0.05-0.15 mm.

[0098] Specifically, during assembly, the metal pin is inserted into the socket for axial positioning, and the elastic contact piece generates radial clamping force to fix the metal pin. This insertion method eliminates the need for pre-reserved soldering areas on the printed circuit board surface, thus eliminating the problem of traditional solder joints occupying lateral space. The perpendicular insertion direction of the metal pin into the socket adapts to the longitudinal spatial distribution characteristics inside the earphone, and the insertion depth can be set to 1.2-2.5 mm to ensure mechanical strength. When disassembly and maintenance are required, applying traction in the opposite direction of insertion can separate the metal pin from the socket, avoiding damage to the flexible circuit structure.

[0099] Compared to existing technologies, traditional soldering connections require a solder pad area of ​​at least 3 mm, and high-temperature soldering can easily cause deformation of flexible circuit boards. Screw fixing solutions require mounting holes with a diameter of more than 2 mm and occupy additional lateral space for installing nuts. In contrast, this solution compresses the connection point to the diameter of the insertion hole through a vertical plug-in structure, reducing lateral space occupation by approximately 60%. At the same time, the multi-point contact formed by the plug-in reduces the contact resistance to below 5 milliohms.

[0100] Through the above technical solution, this application achieves a compact connection between the power supply unit 22 and the printed circuit board assembly 1, eliminating the problem of increased volume caused by solder buildup. The mechanical locking force of the plug-in structure improves the vibration resistance of the connection point, and no contact failure occurred in vibration tests with frequencies of 20-2000Hz. This structure also supports rapid assembly and disassembly operations, reducing the single plug-in / disassembly cycle time to less than 0.5 seconds.

[0101] This application further proposes that the length L of the radiating element 21 is limited to between 24.45 mm and 24.75 mm.

[0102] The length of the radiating unit 21 refers to the physical dimension of the flexible printed circuit board structure extending along the edge of the ear shell 100, which can be achieved by adjusting the cutting size of the flexible substrate or the etching process parameters. This length range enables the radiating unit 21 to form effective electromagnetic wave resonance within the spatial constraints of the ear shell 100.

[0103] Specifically, the length of the radiating element 21 is controlled within a range close to one-quarter of the operating wavelength, enabling the flexible printed circuit board structure to generate a stable electromagnetic field distribution within a limited space. By aligning the extension direction of the radiating element 21 with the bending path of the ear shell 100 edge, assembly interference caused by the excessive size of the traditional omnidirectional antenna 2 can be avoided. This length range simultaneously balances electromagnetic wave radiation efficiency and structural compactness, allowing the flexible printed circuit board to perfectly conform to the contour of the ear shell 100, maximizing space utilization while maintaining stable signal transmission.

[0104] Through the above technical solution, this application achieves a physical fit between the antenna 2 structure and the compact internal space of the earphone, eliminating the risk of assembly interference while ensuring electromagnetic wave radiation efficiency. The radiating unit 21 can fit completely along the edge of the ear shell 100, avoiding signal transmission dead spots caused by the size mismatch of the traditional antenna 2, and ensuring stable wireless signal transmission of the headband earphone at any wearing angle.

[0105] This application further proposes that the width W of the radiating element 21 is 16.25mm-24.90mm.

[0106] The width of the radiating element 21 refers to the lateral dimension of the flexible printed circuit board structure in the direction perpendicular to the edge extension of the ear shell 100. Specifically, it can be achieved by cutting and shaping multiple layers of flexible circuit material. This width range is set to match the curvature of the ear shell 100 edge while maintaining the effective area of ​​the radiating surface of the antenna 2.

[0107] Specifically, when the radiating element 21 is confined within this width range, its lateral physical dimensions neither exceed the available space limitations of the internal assembly area of ​​the earpiece 100 nor fail to form a sufficient electromagnetic wave resonant region. The flexible circuit board material can be bent and fitted to the contour of the earpiece 100, while the lower width limit ensures the integrity of the current path to avoid signal attenuation, and the upper width limit prevents assembly interference caused by excessive material stacking. This size configuration allows the antenna 2 to maintain an omnidirectional radiation mode within a limited space, while avoiding the installation difficulties caused by the excessive size of traditional omnidirectional antennas 2.

[0108] Through the above technical solution, this application achieves a balance between the compact layout of the internal antenna 2 of the headband headphones and omnidirectional signal coverage. While ensuring that the antenna 2 unit is stably assembled on the curved structure of the ear shell 100, it maintains the characteristic of electromagnetic waves radiating uniformly in 360 degrees in the horizontal plane, eliminating the signal dead zone problem caused by the size or material limitations of the antenna 2 in traditional solutions.

[0109] Example 3:

[0110] The difference between this embodiment and Embodiment 2 is that this application further proposes that the connecting unit is provided with a first adhesive surface and a second adhesive surface, the first adhesive surface is bonded to the radiating unit 21, and the second adhesive surface is bonded to the ear shell 100.

[0111] The connecting unit refers to the intermediate structure used to fix the radiating unit 21 and the ear shell 100. Specifically, it can be implemented using double-sided tape or an adhesive material layer, forming a physical connection through the adhesion of both sides. The first adhesive surface refers to the adhesive interface in contact with the radiating unit 21, which can be implemented using a flexible adhesive layer, avoiding stress concentration by adapting to the deformation characteristics of the flexible printed circuit board. The second adhesive surface refers to the adhesive interface in contact with the ear shell 100, which can be implemented using a curved adhesive layer, ensuring complete coverage of the adhesive surface by adapting to the curved shape of the ear shell 100's edge.

[0112] Specifically, the radiating unit 21 of the flexible printed circuit board structure is bonded to the connecting unit via a first adhesive surface, ensuring that the radiating unit 21 precisely fits the predetermined position on the edge of the ear shell 100, avoiding deformation or misalignment caused by mechanical fixing, thereby maintaining the electromagnetic wave emission performance of the radiating unit 21. The ear shell 100 is bonded to the connecting unit via a second adhesive surface, forming a stable connection between the radiating unit 21 and the curved surface of the ear shell 100, preventing displacement caused by external forces. The two adhesive surfaces work together to form a bidirectional fixation, ensuring the reliability of the electrical connection between the radiating unit 21 and the printed circuit board assembly 1, while also reducing the space occupied inside the earphone during installation.

[0113] In some specific embodiments, the connecting unit may be made of a pre-coated thin film material, and the first adhesive surface is bonded to the radiating unit 21 by hot pressing or cold pressing, while the second adhesive surface is bonded to the curved edge of the ear shell 100 by a pressure-sensitive adhesive layer. For example, the adhesive layer thickness is controlled to be less than 0.1 mm to avoid increasing the overall structural thickness.

[0114] Through the above technical solution, this application achieves precise positioning and reliable fixation of the radiating unit 21 and the edge of the ear shell 100, ensuring the positional stability of the radiating unit 21 during signal transmission and reducing signal fluctuations caused by mechanical vibration or external force; at the same time, it simplifies the internal structure layout of the headphones, improves assembly efficiency and reduces production costs.

[0115] This application further proposes a structure in which the connecting unit is formed by 3M adhesive.

[0116] Specifically, during the assembly of the earpiece 100, the first adhesive surface of the 3M adhesive is applied to the bottom surface of the radiating unit 21, while the second adhesive surface covers the predetermined mounting position of the earpiece 100. When the radiating unit 21 is bent along the edge of the earpiece 100, the elastic base layer of the adhesive stretches and deforms, ensuring continuous contact between the radiating unit 21 and the curved surface of the earpiece 100. This bonding method eliminates the space required for metal pins in traditional soldering, avoids the limitation of the earpiece 100 thickness imposed by the snap-fit ​​structure, and reduces the overall thickness of the antenna 2 module to the sum of the adhesive layer thickness and the thickness of the radiating unit 21. During signal transmission, the gapless interface formed by the double-sided adhesive effectively reduces the reflection loss of electromagnetic waves at the connection interface.

[0117] Through the above technical solution, this application solves the space occupation problem caused by the traditional antenna 2 connection structure inside the headband headphones, allowing the radiating unit 21 to fit tightly against the edges of the ear shell 100 with different curvatures. Double-sided gapless bonding effectively avoids signal reflection caused by mechanical connection points, improving wireless transmission stability. The deformability of the flexible adhesive layer allows the antenna 2 module to adapt to the compact layout inside the headband headphones, while ensuring that the radiating unit 21 remains fixed during wearing deformation.

[0118] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0119] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0120] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0121] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0122] In this application, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" a first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0123] Although the description of this application has been made in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A headband-style headphone, characterized in that, It includes an ear shell (100) and a wireless communication component (200), wherein the wireless communication component (200) is disposed inside the ear shell (100); The wireless communication component (200) includes a printed circuit board assembly (1) and an antenna (2), the antenna (2) being electrically connected to the printed circuit board assembly (1), and the wireless communication component (200) being used to perform signal reception, processing and transmission functions; The antenna (2) includes: Radiation unit (21) is used to generate and radiate electromagnetic waves. The radiation unit (21) is a flexible printed circuit board structure and is attached to the side of the ear shell (100). A power supply unit (22), one end of which is connected to the radiating unit (21), and the other end of which is connected to the printed circuit board assembly (1); and A connecting unit is connected between the radiating unit (21) and the ear shell (100) for attaching the radiating unit (21) along the edge of the ear shell (100).

2. The headband headphones according to claim 1, characterized in that, The radiation unit (21) is formed by multiple straight sections (211) and multiple curved sections (212).

3. The headband headphones according to claim 1, characterized in that, The power supply unit (22) includes a coaxial line (221) and a fixing part (222). The fixing part (222) is connected to one end of the coaxial line (221) away from the radiation unit (21) and is connected to the printed circuit board assembly (1).

4. The headband headphones according to claim 3, characterized in that, The coaxial line (221) is provided with a signal terminal (223) and a ground terminal (224) at one end away from the fixing part (222); the signal terminal (223) and the ground terminal (224) are respectively connected to the radiation unit (21), and the ground terminal (224) is located between the signal terminal (223) and the fixing part (222), and is located close to the signal terminal (223).

5. The headband headphones according to claim 4, characterized in that, A UV adhesive layer (225) is provided between the signal terminal (223), the grounding terminal (224) and the radiation unit (21).

6. The headband headphones according to claim 3, characterized in that, The fixing part (222) includes a matching metal pin and a socket. The metal pin is connected to the power supply unit (22), and the socket is located on the printed circuit board assembly (1). The metal pin is inserted into the socket.

7. The headband headphones according to claim 1, characterized in that, The length of the radiation single is 24.45mm-24.75mm.

8. The headband headphones according to claim 1, characterized in that, The width of the radiation single is 16.25mm-24.90mm.

9. The headband headphones according to any one of claims 1-7, characterized in that, The connecting unit is provided with a first adhesive surface and a second adhesive surface opposite to each other. The first adhesive surface is bonded to the radiation unit (21), and the second adhesive surface is bonded to the ear shell (100).

10. The headband headphones according to claim 9, characterized in that, The connecting unit is a structure formed with 3M adhesive backing.

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