Wireless earphone

Abstract

The utility model provides a wireless earphone. The wireless earphone comprises a housing; the main board is arranged in the shell, and a feeding point and at least two grounding points are arranged on the main board; the main antenna is a flexible antenna, the first end of the main antenna is connected with the feeding point, and the second end of the main antenna is connected with the grounding point; and the parasitic antenna is a flexible antenna, and the parasitic antenna is connected with the grounding point. According to the wireless earphone provided by the utility model, the external interference on the wireless earphone is smaller, and the signal bandwidth is larger.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communication, and particularly to a wireless earphone. Background Art

[0002] In the prior art, wireless earphones are generally miniaturized, which brings great difficulties to the design of the main board of the earphone and the antenna on the main board. In the prior art, ceramic antennas, FPC antennas or LDS antennas are usually adopted. However, due to the small size of the main board, only monopoles can be used for ceramic antennas, resulting in greater interference from the human body to the performance. And due to the limitation of the antenna volume, the bandwidth of the antenna is greatly limited. In wireless stereo earphones, due to the too small main board and too many components, there is insufficient clearance area, and ceramic antennas cannot be used. LDS laser engraving requires special materials and high costs. Therefore, a new antenna setting method is needed to make the signal of the wireless earphone better, with a larger bandwidth and lower cost. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a wireless earphone, which can make the wireless earphone less interfered by the outside world and have a larger signal bandwidth.

[0004] The wireless earphone according to the first aspect embodiment of the utility model includes: a housing; a main board disposed in the housing, with a feeding point and at least two grounding points disposed on the main board; a main antenna, the main antenna being a flexible antenna, the first end of the main antenna being connected to the feeding point, and the second end of the main antenna being connected to the grounding point; a parasitic antenna, the parasitic antenna being a flexible antenna, and the parasitic antenna being connected to the grounding point.

[0005] The wireless earphone according to the first aspect embodiment of the utility model has at least the following beneficial effects: by setting the main antenna and the parasitic antenna as flexible antennas to adapt to the relatively narrow space in the housing. At the same time, the signal enters the main antenna from the feeding point of the main board and then enters the grounding point, and the signal is radiated out through the main antenna. The parasitic antenna is connected to the grounding point to radiate the signal again, so that the wireless earphone is less interfered by the outside world and the bandwidth of the antenna is improved.

[0006] According to some embodiments of the utility model, a clearance area is disposed on the main board, and the area on the main board where no electronic components are disposed is the clearance area, and both the main antenna and the parasitic antenna are disposed in the clearance area.

[0007] According to some embodiments of the utility model, an adhesive area is further disposed on the main board, the adhesive area is disposed along the edge of the main board, and both the feeding point and the grounding point are disposed in the adhesive area.

[0008] According to some embodiments of the present utility model, the parasitic antenna is disposed on a side of the main antenna close to the adhesive area.

[0009] According to some embodiments of the present utility model, a gap is provided between the parasitic antenna and the main antenna, and the gap is not less than 0.5 mm.

[0010] According to some embodiments of the present utility model, both the main antenna and the parasitic antenna are disposed on a side of the main board away from the human body.

[0011] According to some embodiments of the present utility model, both the main antenna and the parasitic antenna are fixedly connected to the inner side of the housing.

[0012] According to some embodiments of the present utility model, the main antenna includes a first main body, a first connection portion, and a second connection portion. The first connection portion and the second connection portion are both disposed on the first main body. The first connection portion is connected to the feeding point, and the second connection portion is connected to the grounding point. The first main body is fixedly connected to the top surface of the housing, and the first main body is disposed along the side edge of the housing and is spaced from the side surface of the housing.

[0013] According to some embodiments of the present utility model, the parasitic antenna includes a third connection portion and a second main body. The third connection portion is disposed on the second main body. The third connection portion is connected to the grounding point. The second main body is fixedly connected to the top surface of the housing, and the second main body is disposed along the first main body and is disposed between the first main body and the side surface of the housing.

[0014] According to some embodiments of the present utility model, the first main body and the second main body are adhered to the top surface of the housing.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic internal structure diagram of the left ear portion of the wireless earphone of the present utility model;

[0017] Figure 2 is a schematic housing structure diagram of the wireless earphone of the present utility model;

[0018] Figure 3 is a schematic diagram of the clearance area on the main body of the wireless earphone of the present utility model;

[0019] Figure 4 is a schematic diagram of the adhesive area on the main body of the wireless earphone of the present utility model;

[0020] Figure 5 It is a schematic diagram of the internal structure of the right ear part of the wireless earphone of the present utility model;

[0021] Figure 6 It is a schematic diagram of the structures of the main antenna and the parasitic antenna of the wireless earphone of the present utility model.

[0022] Reference numerals in the attached drawings:

[0023] 1. Housing; 11. Side surface; 12. Top surface; 2. Main board; 21. Clearance area; 22. Adhesive area; 23. Feeding point; 24. Grounding point; 3. Main antenna; 31. First connecting portion; 32. Second connecting portion; 33. First main body; 4. Parasitic antenna; 41. Third connecting portion; 42. Second main body. Specific embodiments

[0024] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0025] In the description of the present utility model, it should be understood that with respect to the orientation description, such as the upper, lower, etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present utility model.

[0026] In the description of the present utility model, "a plurality of" refers to more than two. If there is a description of the first and the second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0027] In the description of the present utility model, unless otherwise clearly defined, words such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0028] The antennas used in wireless earphones are generally divided into ceramic antennas, FPC antennas (flexible antennas), and LDS antennas.

[0029] Among them, the flexible antenna is a kind of antenna with characteristics such as bending, stretching, and flexibility. Its design concept is to provide the flexibility and adaptability of the antenna by using flexible materials and special structures, enabling it to adapt to different application environments and requirements. Its main features include: Bending performance: It can be bent into a curved shape without losing performance. Stretching performance: It has a certain stretching ability to adapt to different size requirements. Flexibility: The overall structure is soft and easy to adapt to various curved surfaces and complex environments. The manufacturing materials of flexible antennas are diverse, mainly including flexible materials such as conductive polymers, conductive fibers, and conductive nanomaterials. These materials have good flexibility and plasticity and can adapt to the curves of the body and various complex environments. In terms of manufacturing technology, flexible antennas can be fabricated by various methods such as wet etching, inkjet printing, and screen printing. Among them, inkjet printing and screen printing are two widely used methods for fabricating flexible antennas, which can precisely control the pattern of conductive materials on the flexible substrate to achieve high-performance flexible antennas.

[0030] The ceramic antenna is made of high-quality ceramic materials such as alumina and zirconia as the substrate. These materials have good insulation, thermal stability, and mechanical strength. At the same time, the ceramic materials have excellent electromagnetic properties, such as low loss and low dielectric constant, which can meet the antenna design requirements of high frequency and small size. The principle of the ceramic antenna is based on the propagation and radiation of electromagnetic waves in the antenna structure. When electromagnetic waves are transmitted through the conductor in the antenna structure, an electric field and a magnetic field will be generated on the conductor, thus forming electromagnetic radiation. By optimizing the shape and size of the conductor, the radiation characteristics of the ceramic antenna can be controlled and optimized to meet the requirements of different frequency bands and application scenarios. The main part of the ceramic antenna consists of a ceramic substrate and a metal conductor. The metal conductor is made on the ceramic substrate through electroplating or deposition processes, and its shape and layout determine the size, frequency response, and radiation characteristics of the antenna. This structure enables the ceramic antenna to achieve a small size and lightweight design while maintaining high efficiency. However, for Bluetooth headsets, the volume of the ceramic antenna is still relatively large. Especially for TWS headsets (true wireless stereo headsets), more electronic components will be set on the main board, resulting in a smaller clearance area that can accommodate the ceramic headset. And the ceramic headset is also prone to interference from the human body when set on the headset.

[0031] LDS antenna technology uses numerically controlled lasers to directly transfer circuit patterns onto the surface of molded plastic components, forming a circuit interconnection structure through the three-dimensional surface of the three-dimensional workpiece. Specifically, this technology includes the following key steps: Injection molding: Special thermoplastic plastics containing special chemical additives (i.e., laser powder) are injection molded on an injection molding machine. Laser activation: Through laser beam activation, the laser powder is activated to form metal nuclei and a rough surface, providing an anchoring point for the next electroplating step. Electroplating: Chemical plating is performed on the laser-activated plastic surface to form metal circuits such as copper and nickel, making the plastic an MID component with conductive circuits. Assembly: The electroplated product is installed on the product, and when necessary, the circuit is sprayed to obtain an excellent appearance. This technology is complex to manufacture and has a relatively high cost.

[0032] Referring to Figure 1 , Figure 2 and Figure 6 , the wireless earphone in the first embodiment of the present utility model includes: a housing 1; a main board 2, a main antenna 3, and a parasitic antenna 4. The main board 2 is disposed inside the housing 1, and a feeding point 23 and at least two grounding points 24 are provided on the main board 2. The first end of the main antenna 3 is connected to the feeding point 23, the second end of the main antenna 3 is connected to the grounding point 24, and the main antenna 3 is a flexible antenna; the parasitic antenna 4 is a flexible antenna, and the parasitic antenna 4 is connected to the grounding point 24. Among wireless earphones, the internal space is relatively small, so each component is arranged more compactly, and there is less space left for the main antenna 3 or the parasitic antenna 4. Especially in true wireless stereo earphones, in order to implement their functions, more electronic components need to be provided on the main board 2 of the earphone, resulting in less area on the main board 2 where antennas can be provided. Therefore, the main antenna 3 and the parasitic antenna 4 are set as flexible antennas. Flexible antennas can better adapt to areas of different shapes, so that antennas can be set in more areas. At the same time, flexible antennas are thinner and are also easier to fix inside the housing 1. Specifically, the main antenna 3 is respectively connected to the feeding point 23 and the grounding point 24. Signals are transmitted from the feeding point 23 to the grounding point 24 and radiated out when passing through the main antenna 3. When the main antenna 3 is excited, it generates electromagnetic waves and radiates them into the surrounding space. At this time, the parasitic antenna 4 connected to the grounding point 24, as a passive component, will sense these electromagnetic waves and generate corresponding current distributions. These current distributions will in turn affect the radiation characteristics of the main antenna 3, thereby optimizing the antenna performance. And at this time, the parasitic antenna 4 set as a flexible antenna can also better set its shape. The parasitic antenna 4 can not only set its shape according to the shape of the housing 1 like the main antenna 3, but the parasitic antenna 4 can also set the shape of the parasitic antenna 4 according to the shape of the main antenna 3, making the improvement effect of the parasitic antenna 4 on the signal better, not only making the signal propagation distance farther, but also broadening the antenna bandwidth. Among them Figure 1 is a schematic diagram of the wireless earphone on the left ear, Figure 5Schematic diagram of the wireless earphone on the right ear. The wireless earphone on the left ear and the wireless earphone on the right ear are symmetrically arranged in a stacked manner with each other.

[0033] Among them, the main board 2 is a PCB board, that is, a printed circuit board. The PCB board is a substrate used for assembling electronic components, made of one or more layers of insulating materials, with copper wire traces printed on it, and these traces connect various parts in the circuit. Through the wire traces printed on the board, various components in the circuit are connected to form a complete circuit system, enabling the electronic device to work properly. Among them, the feeding point 23 and the grounding point 24 are both formed by these wires.

[0034] According to some embodiments of the present invention, referring to Figure 3 , a clearance area 21 is provided on the main board 2. The area on the main board 2 where no electronic components are provided is the clearance area 21. Both the main antenna 3 and the parasitic antenna 4 are provided in the clearance area 21. The antennas on the main board 2 are arranged in the clearance area 21 mainly for the following considerations. Reducing interference: Antenna signals are extremely vulnerable to interference, especially from other high-frequency and power traces. Placing the antennas in the clearance area 21 can ensure that there are no or minimal such interference sources around the antennas, thereby improving the signal reception and transmission capabilities of the antennas. Optimizing the radiation field: The clearance area 21 helps to maintain the integrity and directivity of the antenna radiation field, avoiding the radiation field being distorted or distorted, thereby improving the radiation efficiency and gain performance of the antennas. Improving signal stability: The clearance area 21 can also reduce signal fluctuations caused by the movement or change of objects around the antennas, thereby improving signal stability. Enhancing signal coverage: The clearance area 21 helps to enhance the signal coverage of the antennas, enabling the device to maintain good communication quality at a farther distance.

[0035] According to some embodiments of the present invention, referring to Figure 4, a back glue area 22 is also provided on the main board 2. The back glue area 22 is arranged along the edge of the main board 2. Both the feeding point 23 and the grounding point 24 are arranged in the back glue area 22. The parasitic antenna 4 is arranged on one side of the main antenna 3 close to the back glue area 22. The area on the main board 2 where the back glue is set is the back glue area 22. The back glue area 22 on the earphone main board 2 mainly plays a role in fixing and sealing, so as to ensure a firm connection between the main board 2 and other components of the earphone, and prevent external factors such as moisture and dust from invading the inside of the earphone. Specifically, the back glue can firmly paste the main board 2 at the corresponding position of the earphone housing 1, prevent the main board 2 from shaking or shifting inside the earphone, so as to ensure the stability of audio transmission and the clarity of sound quality. The back glue can also form a sealing layer to effectively isolate the contact between the external environment and the internal electronic components of the earphone, and improve the waterproof and dustproof performance of the earphone. This is of great significance for protecting the delicate electronic components inside the earphone and extending the service life of the earphone. Common back glue materials include double-sided tape, hot melt adhesive, silicone, etc. These materials have different viscosities and weather resistances, and can adapt to different use environments and requirements. Setting the back glue area 22 on the edge of the main board 2 can not only make the connection between the main board 2 and the housing 1 more firm, but also it is more suitable to connect the feeding point 23 and the grounding point 24 to the main antenna 3 and the parasitic antenna 4 in the back glue area 22. That is, the fixing of the main board 2 and the connection of the interfaces. During the earphone production process, the main board 2 is placed at a predetermined position inside the housing 1, and an appropriate amount of back glue is applied to the back of the main board 2. Then, the back glue is cured by pressing or heating, etc., so as to fix the main board 2 on the housing 1. And the main antenna 3 and the parasitic antenna 4 are connected to the main board 2 in the back glue area 22, making the connection between the main antenna 3 and the parasitic antenna 4 and the main board 2 more firm. Moreover, the back glue area 22 is arranged at the position of the edge of the main board 2 close to the housing 1, and the main antenna 3 and the parasitic antenna 4 also need to be arranged in accordance with the housing 1, so that the connection distance between the main board 2 and the antenna can be closer, reducing the influence on the signal.

[0036] According to some embodiments of the present utility model, there is a gap between the parasitic antenna 4 and the main antenna 3, and the gap is not less than 0.5 mm. The gap between the parasitic antenna 4 and the main antenna 3 is an important design parameter, which directly affects the performance of the antenna, including resonance frequency, bandwidth, radiation direction, etc. Among them, resonance frequency: The gap between the parasitic antenna 4 and the main antenna 3 will affect the coupling strength between them, and thus affect the resonance frequency of the entire antenna system. By adjusting the length of the parasitic element and the distance between the parasitic element and the main antenna 3, the resonance frequency can be changed, thereby expanding the frequency band range supported by the antenna and achieving multi-band coverage. Bandwidth: A resonance circuit is formed between the parasitic patch and the main radiation patch. By adjusting parameters such as the size, spacing, and position of the parasitic patch, the resonance frequency of the circuit can be made close to the resonance frequency of the main radiation patch, and the frequency curves intersect with each other, so that the overall bandwidth of the antenna expands towards the low-frequency direction. Radiation performance: The electromagnetic field distribution generated by the parasitic patch through coupling can play a guiding role in the radiation performance of the antenna according to factors such as the horizontal distance and height difference between it and the main radiation patch, as well as the spacing of the parasitic patch itself. In order to avoid interference, the gap between the parasitic antenna 4 and the main antenna 3 needs to be large enough to avoid direct interference between them. Especially in the high-frequency band, a small gap may cause a strong mutual coupling effect and reduce the overall performance of the antenna. Therefore, the gap between the parasitic antenna 4 and the main antenna 3 is not less than 0.5 mm. At the same time, the gap should not be too large, because too large a gap will weaken the coupling strength between the parasitic antenna 4 and the main antenna 3 and affect the overall performance of the antenna system. Therefore, it is necessary to find a balance between avoiding interference and optimizing coupling. Specifically, the gap between the parasitic antenna 4 and the main antenna 3 is set to 1.01 mm.

[0037] According to some embodiments of the present utility model, both the main antenna 3 and the parasitic antenna 4 are disposed on the side of the main board 2 away from the human body. During the use of the earphone, it is usually attached to and worn on the human body. Human tissues have certain electromagnetic characteristics, and these characteristics will affect the electromagnetic field distribution around the antenna on the earphone. When the antenna is close to the human body, the electromagnetic characteristics of the human body may change the dielectric constant and magnetic permeability of the antenna, thereby affecting the performance of the antenna. The absorption and reflection of electromagnetic waves by the human body may affect the transmission stability of the earphone signal. Especially in the case of weak signals, the interference of the human body on the signal may be more obvious. Therefore, the main antenna 3 and the parasitic antenna 4 are disposed on the side of the main board 2 away from the human body to be as far away from the human body as possible to reduce the influence of the human body on the earphone signal.

[0038] According to some embodiments of the present utility model, both the main antenna 3 and the parasitic antenna 4 are fixedly connected to the inner side of the housing 1. Since both the main antenna 3 and the parasitic antenna 4 are flexible antennas, in order to prevent the two from shaking in the housing 1, the two are fixed to the housing 1 to make the signal of the earphone more stable.

[0039] According to some embodiments of the present utility model, with reference to Figure 6 , the main antenna 3 includes a first body 33, a first connection portion 31, and a second connection portion 32. The first connection portion 31 and the second connection portion 32 are both provided on the first body 33. The first connection portion 31 is connected to the feeding point 23, and the second connection portion 32 is connected to the grounding point 24. The first body 33 is fixedly connected to the top surface 12 of the housing 1, and the first body 33 is arranged along the edge of the side surface 11 of the housing 1 and is spaced from the side surface 11 of the housing 1. The first connection portion 31 and the second connection portion 32 are used to connect to the main board 2. The signal enters the first body 33 after passing through the first connection portion 31 from the feeding point 23, and the signal is radiated through the first body 33. By connecting the first body 33 to the top surface 12 of the housing 1, a certain interval is formed between the first body 33 and the main board 2, thereby avoiding interference of the electronic components on the main board 2 with the main antenna 3.

[0040] According to some embodiments of the present utility model, the parasitic antenna 4 includes a third connection portion 41 and a second body 42. The third connection portion 41 is provided on the second body 42. The third connection portion 41 is connected to the grounding point 24. The second body 42 is fixedly connected to the top surface 12 of the housing 1, and the second body 42 is arranged along the first body 33 and is arranged between the first body 33 and the side surface 11 of the housing 1. By arranging the second body 42 on one side of the first body 33, the parasitic antenna 4 can better improve the signal emitted by the main antenna 3.

[0041] According to some embodiments of the present utility model, the first main body 33 and the second main body 42 are adhered to the top surface 12 of the housing 1. In order to save the space inside the housing 1 and make the first main body 33 and the second main body 42 more firmly arranged in the housing 1, the adhesion method is adopted for the arrangement. Adhering the flexible antenna in the earphone housing 1 involves delicate operations, in which an adhesive needs to be used for adhesion. The adhesive of the flexible antenna is a key material to ensure a firm bond between the antenna and the housing 1. The adhesive has good bonding performance, which can ensure that the antenna is tightly bonded to the base material under various conditions (such as temperature and humidity changes), avoiding detachment or loosening. It even needs to have excellent electrical conductivity to ensure the integrity and efficiency of signal transmission. For example, silicone conductive silver paste. Common flexible antenna adhesives include but are not limited to polyurethane adhesives, epoxy resin adhesives, silicone conductive silver paste, and molecular glue nano adhesives such as polydopamine. Among them, polyurethane adhesives have excellent bonding performance and strength, low cost, and are suitable for low-temperature bonding. Epoxy resin adhesives have high strength, high hardness, strong adhesion, and good chemical stability. Silicone conductive silver paste has good film-forming properties, good flexibility and high electrical conductivity after curing at room temperature. Molecular glue nano adhesives such as polydopamine have high spatial uniformity and mechanical flexibility, making the bond between the flexible antenna and the base material closer.

[0042] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present utility model.

Claims

1. A wireless earphone, characterized in that, Comprising: A housing; A main board disposed within the housing, the main board being provided with a feeding point and at least two grounding points; A main antenna, the main antenna being a flexible antenna, a first end of the main antenna being connected to the feeding point, and a second end of the main antenna being connected to the grounding point; A parasitic antenna, the parasitic antenna being a flexible antenna, the parasitic antenna being connected to the grounding point.

2. The wireless earphone according to claim 1, wherein A clearance area is provided on the main board, and an area on the main board where no electronic components are provided is the clearance area, and both the main antenna and the parasitic antenna are disposed within the clearance area.

3. The wireless earphone according to claim 2, wherein A back adhesive area is further provided on the main board, the back adhesive area being disposed along the edge of the main board, and both the feeding point and the grounding point are disposed within the back adhesive area.

4. The wireless earphone according to claim 3, wherein The parasitic antenna is disposed on a side of the main antenna close to the back adhesive area.

5. The wireless earphone according to claim 4, wherein A gap is provided between the parasitic antenna and the main antenna, and the gap is not less than 0.5 mm.

6. The wireless earphone according to claim 1, wherein, Both the main antenna and the parasitic antenna are disposed on a side of the main board away from the human body.

7. The wireless earphone according to claim 1, wherein Both the main antenna and the parasitic antenna are fixedly connected to the inner side of the housing.

8. The wireless earphone according to claim 1, wherein The main antenna includes a first main body, a first connecting portion, and a second connecting portion. Both the first connecting portion and the second connecting portion are disposed on the first main body. The first connecting portion is connected to the feeding point, and the second connecting portion is connected to the grounding point. The first main body is fixedly connected to the top surface of the housing, and the first main body is disposed along the side edge of the housing and is spaced from the side surface of the housing.

9. The wireless earphone according to claim 8, wherein, The parasitic antenna includes a third connecting portion and a second main body. The third connecting portion is disposed on the second main body. The third connecting portion is connected to the grounding point. The second main body is fixedly connected to the top surface of the housing, and the second main body is disposed along the first main body and is disposed between the first main body and the side surface of the housing.

10. The wireless earphone according to claim 9, characterized in that, The first main body and the second main body are adhered to the top surface of the housing.

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