CN216626024U - Bluetooth headset and Bluetooth headset system - Google Patents

Abstract

A Bluetooth headset and a Bluetooth headset system are provided. The Bluetooth headset comprises a headset rod and a headset head, wherein an antenna, a mainboard and a first metal device are arranged in the headset rod, the first metal device is positioned on one side of the antenna, which is close to the headset head, and is electrically connected with the mainboard, and the antenna is used for receiving and transmitting electromagnetic waves; the earphone head is positioned at one end of the earphone rod and comprises a second metal device, and the second metal device is electrically connected with the mainboard; in the process that the antenna emits electromagnetic waves, the first metal device, the second metal device and the antenna generate an electromagnetic coupling effect, and under the electromagnetic coupling effect, a main beam of the antenna points to one side far away from the earphone head along the earphone rod. Through reasonable stacking of metal devices in the earphone, the metal devices and the earphone antenna generate an electromagnetic coupling effect, and therefore the direction of a main beam of the earphone antenna is improved.

Description

Bluetooth headset and Bluetooth headset system

Technical Field

The present application relates to the field of headsets, and more particularly, to a bluetooth headset and bluetooth headset system.

Background

A wireless bluetooth headset typically includes a headset stem and a headset head. The antenna of a bluetooth headset is typically located inside the headset stem. However, due to the limitation of the shape of the headset, the antenna signal of the conventional bluetooth headset is weak, and the communication quality is poor.

Disclosure of Invention

The application provides a bluetooth headset and bluetooth headset system to promote bluetooth headset's communication quality.

In a first aspect, a bluetooth headset is provided, comprising: the earphone comprises an earphone rod and an earphone head, wherein an antenna, a main board and a first metal device are arranged in the earphone rod, the first metal device is positioned on one side of the antenna, which is close to the earphone head, and is electrically connected with the main board, and the antenna is used for receiving and transmitting electromagnetic waves; the earphone head is positioned at one end of the earphone rod and comprises a second metal device, and the second metal device is electrically connected with the main board; in the process that the antenna emits electromagnetic waves, the first metal device, the second metal device and the antenna generate an electromagnetic coupling effect, and under the electromagnetic coupling effect, the main beam of the antenna points to one side far away from the earphone head along the earphone rod.

Optionally, when the earphone is worn, the first metal device and the antenna form a dual-array, and a main beam of the dual-array is directed to the tail end of the earphone rod.

Optionally, the first metal device comprises a touch sensor.

Optionally, the touch sensor is sheet-like.

Optionally, the inside of the earphone rod further comprises a first FPC, and the first metal device and the antenna are attached to the inner wall of the earphone rod through the first FPC.

Optionally, the second metal device includes an in-ear sensor, the in-ear sensor is electrically connected to the main board through a board-to-board connector, and when the bluetooth headset is not worn, a main beam of the antenna points between an extending direction of the headset head and an extending direction of the headset rod under an electromagnetic coupling effect.

Optionally, the in-ear sensor is cambered around the earpiece.

Optionally, the second metal device further comprises at least one of a battery, a speaker, and a magnet.

Optionally, the first metal device further includes at least one of a charging contact, an antenna dome, and a microphone.

Optionally, the antenna is an inverted L-shaped or inverted F-shaped antenna, and the antenna extends along the length of the earphone rod.

Optionally, one end of the antenna away from the earphone head is provided with a U-shaped bending part.

In a second aspect, there is provided a bluetooth headset system comprising: a headset charging box and a headset according to the first aspect.

The utility model provides a bluetooth headset utilizes the reasonable design of piling up of the inside metal device of earphone, makes the antenna of metal device and earphone produce the electromagnetic coupling effect to improve the directive of antenna mainbeam, promoted bluetooth headset's communication quality effectively.

Drawings

Fig. 1 is a block diagram of an exemplary headset according to an embodiment of the present application.

Fig. 2 is a schematic diagram of the antenna transmission and reception process.

Fig. 3 is a schematic diagram of a dipole antenna.

Fig. 4 is a schematic diagram of the radiated energy of a dipole antenna.

Fig. 5 is a diagram of the far field radiation field strength, distribution of an ideal dipole antenna.

Fig. 6 is a schematic structural diagram of a bluetooth headset in the related art.

Fig. 7 is a block diagram of a simplified monopole antenna.

Fig. 8 is a pattern diagram of the monopole antenna of fig. 7.

Fig. 9 is a process of evolving from a monopole antenna to an inverted L antenna and an inverted F antenna.

Fig. 10 shows a pattern of the inverted F antenna when the ground is one-half wavelength.

Fig. 11 is a simplified inverted F antenna and its pattern.

Fig. 12 is a pattern diagram of yet another simplified inverted-F antenna.

Fig. 13 is a pattern diagram of an antenna of a related art bluetooth headset with a main board in an ear cavity.

Fig. 14 is a pattern when a related art bluetooth headset is worn on a human body.

Fig. 15 is a schematic front view of a bluetooth headset according to an embodiment of the present application.

Fig. 16 is a side view of the bluetooth headset of fig. 15.

Fig. 17 is a front view of the current distribution in free space of the bluetooth headset of fig. 15.

Fig. 18 is a side view of the current distribution in free space of the bluetooth headset of fig. 15.

Fig. 19 is an equivalent current schematic of the current distribution front view of fig. 18.

Fig. 20 is a life simulation pattern of the antenna of the bluetooth headset of fig. 15.

Fig. 21 is a surface current distribution of the bluetooth headset of fig. 15 worn behind the human ear.

Fig. 22 is a directional pattern of the antenna when the earphone shown in fig. 15 is worn.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings. To facilitate understanding of the present application, terms related to embodiments of the present application will be described below with reference to fig. 1 to 4.

True wireless stereo earphone

True Wireless Stereo (TWS) headsets have evolved from bluetooth technology. The main forms of TWS headphones include rod-like, bean-like, and the like. The TWS headset may communicate with a terminal device (e.g., a handset) while in operation. For example, the TWS headset may receive audio data or control information from the terminal device. Communication between the two headsets of the TWS headset may also be performed. For example, one headphone may send a signal to another headphone to control when the other headphone plays audio and stops. The TWS headset may also implement user interaction functionality. For example, the TWS headset may detect whether the headset is worn by the user.

Fig. 1 is a block diagram of an exemplary headset according to an embodiment of the present application. Direction 110 represents the direction in which the headset head extends, direction 120 represents the direction away from the headset head, and direction 130 represents the direction in which the headset stem extends. The direction of the angle between the head of the earphone and the earphone stem refers to the direction of the angle between the direction 110 and the direction 130 and the direction of the angle between the direction 120 and the direction 130. For example, it may refer to either direction along line 111 or line 112, or to either direction along line 113 or 114.

When the headset is worn, the headset head is usually located in the ear of the user. At this point, direction 110 points toward the user's head, while direction 120 points away from the user's head.

Antenna with a shield

An antenna is a device for transmitting or receiving electromagnetic waves. The antennas may be divided into transmission antennas and reception antennas. The transmitting antenna can efficiently convert the energy of the high-frequency current of the transmitter (or the guided wave in a waveguide system) into electromagnetic wave energy of space. The function of the receiving antenna is to convert the electromagnetic wave energy in the space into high-frequency current.

From the birth of radio communication, antennas of various shapes, various frequency bands and various purposes have appeared. Although the difference in appearance between different antennas is large, they all follow the same radiation and reception principles, i.e. electromagnetic and electromagnetic wave theory.

Whatever the shape, the antenna for whatever purpose, can be considered a transducer. As shown in fig. 2, the antenna continuously converts a high-frequency current into electromagnetic waves radiated in space, or continuously acquires radio waves from free space and converts them into a high-frequency current.

Because the transmitter power is limited, it is desirable to avoid the antenna radiating energy in an irrelevant direction in order to propagate the electromagnetic energy further. In fact, the antenna acts like a spotlight for a searchlight and allows for the directional transmission and reception of energy. That is, the antenna has a function of directionally distributing energy to a free space.

Antenna radiation pattern

By antenna radiation pattern is meant a pattern of the relative field strength (normalized mode value) of the radiation field as a function of direction at a distance from the antenna, i.e. the radiation far field of the antenna. Usually represented by two mutually perpendicular plane patterns passing through the maximum radiation direction of the antenna.

The antenna pattern is an important figure for measuring the antenna performance. Various parameters of the antenna can be observed from the antenna pattern.

The antenna pattern is a diagram for indicating the directivity of an antenna, and the term "antenna directivity" refers to the relationship between the relative value of the antenna radiation field and the spatial direction at the same distance R in the far zone.

Fig. 3 is a schematic diagram of a dipole antenna. Fig. 3(a) shows two parallel transmission lines (transmission line 311 and transmission line 312). The dipole antenna is a symmetrically spread form of the end half wavelength portions of transmission lines 311 and 312. As shown in fig. 3(a) and 3(b), the classical dipole antenna has two radiating arms (radiating arm 321 and radiating arm 322) connected to the ports of transmission line 311 and transmission line 312, respectively.

Fig. 4 is a schematic diagram of the radiated energy of a dipole antenna. As shown in fig. 4(a), from the near field point of view, the electric field and the magnetic field are confined in the air between the transmission lines 411 and 412, and no energy is radiated outward. As the ends of the transmission lines 411 and 412 are gradually spread apart, the field generated by the current along the lines is also spread apart. As shown in fig. 4(b), when a high-frequency current flows through two parallel wires 411 and 412 which are close to each other, the phases of the radiated waves at the far field are opposite to each other, and cancel each other out, and the radiation efficiency is almost 0.

From the elementary current radiation characteristics in electromagnetic field theory, the maximum radiation direction at the far field is perpendicular to the direction of the conduction current. As shown in fig. 4(c) to 4(e), the maximum radiation direction of the dipole antenna is perpendicular to the two radiation arms.

Fig. 5 is a far field radiation field strength distribution diagram of an ideal dipole antenna. As shown in fig. 5(a) and 5(b), the far-field radiation field intensity distribution shape of an ideal dipole antenna approximates to a donut. No energy is radiated along the antenna, and the radiation capability in the vertical direction is strongest.

Antenna of bluetooth earphone

Bluetooth headsets (e.g., TWS headsets) can eliminate the cable because the data is propagated through the air by means of radio waves, and the antenna is the device used to perform this transmit and receive function. Fig. 6 is a schematic structural diagram of a bluetooth headset in the related art. The antenna 610 in fig. 6 is the antenna of the earphone.

The main board (not shown) of the bluetooth headset shown in fig. 6 is located in the headset head as the ground for the antenna. The radiation energy of the antenna is jointly emitted by the main board of the Bluetooth headset and the antenna. In fact also part of the antenna.

When the bluetooth headset works, the bluetooth module loads transmission information (such as audio data) on a high-frequency carrier wave through a certain modulation mode and transmits the transmission information to an antenna port through a transmission line. The antenna converts the high-frequency signals in the transmission line into high-frequency electromagnetic waves, transmits the high-frequency electromagnetic waves to the air, and is received and demodulated by opposite-end equipment.

When the bluetooth headset is designed in appearance, the whole miniaturization design of the headset is usually preferred. For the stick-shaped bluetooth headset shown in fig. 6, the length of the headset stick is typically between 25-40 mm. The earphone bar is the best place to place the antenna, where most bluetooth headset antennas are placed.

However, bluetooth headsets typically operate in the bluetooth band. In order to satisfy the optimal radiation efficiency of the antenna, if a dipole antenna is used in the bluetooth headset, the antenna length is about 60mm, which obviously cannot satisfy the design requirements of the bluetooth headset.

Therefore, monopole antennas are often used in bluetooth headsets. For monopole antennas, the best radiation efficiency can be achieved when the length of the antenna radiation arm satisfies a quarter wavelength (approximately 30 mm). Monopole antennas evolved from dipole antennas. In an electronic product including a Printed Circuit Board (PCB) such as a bluetooth headset, a monopole antenna is formed by using one radiating arm of a dipole antenna as a ground of the PCB.

For the antenna of the bluetooth headset shown in fig. 6, as shown in fig. 7, the model can be simplified into a straight line 710 and a ground plane 720 with a larger area. The straight conductor 710 is the radiation arm of the simplified monopole antenna. The length of the radiating arm is approximately a quarter wavelength.

The radiation pattern of the monopole antenna is closely related to the shape and size of the ground. Fig. 8 is a pattern diagram of the simplified monopole antenna shown in fig. 7. Pattern 810 represents the pattern of the monopole antenna when the ground is at infinity. According to the mirror principle, when the ground of the monopole antenna is infinite, the monopole antenna should have the same pattern above the ground as the dipole antenna, but be non-radiative below the ground.

Pattern 820 represents the pattern of the antenna as the area of the ground decreases to twice the wavelength. Pattern 830 represents the pattern of the antenna when the area of the ground is reduced to one-half wavelength. As can be seen from fig. 8, when the area of the ground is reduced to several wavelengths, the pattern is an irregular shape inclined in the opposite direction to the ground. When the ground area is reduced below 0.75 wavelengths, the radiation pattern becomes an almost symmetrical doughnut shape.

inverted-L and inverted-F antennas are a variant of monopole antennas. The inverted L-shaped antenna and the inverted F-shaped antenna have the characteristics of small volume and simple structure. Fig. 9 is a process of evolving from a monopole antenna to an inverted L antenna and an inverted F antenna.

As shown in fig. 9, the monopole antenna shown in fig. 9(a) is first bent by 90 °, and the inverted L antenna shown in fig. 9(b) is formed. At this time, the total length of the antenna is unchanged, i.e., the total length of the antenna is still a quarter wavelength. By making such a modification to the monopole antenna, the height of the antenna can be effectively reduced. The antenna and the ground plane are parallel, so that the overall structure size of the antenna can be reduced.

However, for the inverted-L antenna, since the radiating arm of the antenna is parallel to the ground and the overall height of the antenna is reduced, the capacitance between the antenna radiator and the ground is increased. In order to maintain the resonant characteristics of the antenna, it is necessary to eliminate the capacitive reinforcement caused by such variations.

As shown in fig. 9(c), an inverted F antenna is formed by loading a portion of the shorted stub 930 into the inflection region of the antenna. The inverted F antenna may also be referred to as an IFA antenna. The added short-circuited branches 930 may increase the inductance of the antenna.

Monopole and inverted-L antennas typically require the addition of a Π -shaped matching network on the motherboard board in order to match the feed line paths. The inverted-F antenna is grounded through a section of stub, and the length and the shape of the stub can be adjusted for the inverted-F antenna, so that the antenna is matched with a feed circuit on a main board. Thus, the inverted-F antenna is simpler to implement than the inverted-L antenna.

Fig. 10 shows a pattern of the inverted F antenna when the ground is one-half wavelength. When the inverted-F antenna has a ground surface of more than one-half wavelength, its radiation pattern is a beam with four main lobes, each pointing above the ground surface, as shown in fig. 10.

In an actual bluetooth headset product, the main board of the bluetooth headset cannot provide a sufficiently large ground area. The maximum area of the ground is the maximum area of the main board. And the length of the main board of the Bluetooth headset is only 30mm, the width of the main board of the Bluetooth headset is only 5mm, and the Bluetooth headset is a very small ground. The area of the ground is only a little larger than the antenna, which results in a large variation in the performance of the antenna. In addition, the antenna must have a certain height from the ground to have a good radiation efficiency.

Fig. 11 is a simplified inverted F antenna and its pattern. The pattern of the inverted-F antenna changes relatively greatly due to the large reduction in the ground area. As shown in fig. 11(a) and 11(b), the directional pattern of the inverted F antenna changes from four main lobes to one main lobe, and the main lobe direction is shifted toward the antenna end.

In practice the height of the antenna of the bluetooth headset may be lower. The lower the antenna height, the worse the efficiency. When the height of the antenna is low, the antenna becomes a parallel two-wire transmission line, and the radiation efficiency is drastically reduced.

Fig. 12 is a pattern diagram of yet another simplified inverted-F antenna. The height of a practical bluetooth headset antenna is about 2 mm. As shown in fig. 12(a) and 12(b), when the antenna height decreases, the pattern main beam gradually points in a direction perpendicular to the antenna.

As can be seen from the above analysis, in the related art, the main beam direction of the earphone antenna is generally perpendicular to the earphone rod. Fig. 13 is a pattern diagram of an antenna of a related art bluetooth headset with a main board in an ear cavity. As shown in fig. 13, for a bluetooth headset with the motherboard in the ear cavity, the antenna pattern is a uniform doughnut shape.

Fig. 14 is a pattern when a related art bluetooth headset is worn on a human body. As shown in fig. 14, if such a bluetooth headset is worn on the ear of a real human body, the radiation energy toward the brain side is absorbed by the human body. In this case, the main beam of the directional diagram is directed toward the outside of the head perpendicular to the ear stems, and the energy directed downward below the head is less. That is, the related art provides a bluetooth headset, when the bluetooth headset is worn by a user, a main beam of a directional pattern of an antenna is directed in a direction perpendicular to a headset pole and away from a head (a direction corresponding to the direction 120 shown in fig. 1). At this time, as can be seen from fig. 14, the antenna of the bluetooth headset has a transmission zero at the opposite ear. The transmission zero may also be referred to as a transmission minimum. At the transmission zero point, the radiation power of the antenna is extremely low.

In actual operation, the bluetooth headset is mainly in communication with a mobile terminal (e.g., a mobile phone) and between two headsets. Bluetooth headsets generally only work when worn, for example playing audio. When a user uses a bluetooth headset, the mobile terminal is usually held in the user's hand or in a pocket, and when worn, the two headsets are located on the two ears of the human body.

Due to the related art bluetooth headset, the main beam of the antenna is directed to a side away from the head when worn (direction corresponding to direction 120), rather than being directed to below the head (direction corresponding to direction 130). If a better communication effect is to be achieved, the energy of the earphone needs to be increased to improve the power of the antenna radiation signal and ensure the communication effect of the earphone.

Therefore, with the same efficiency, the communication quality of the earphone (e.g., the communication quality between the earphone and the mobile phone or the communication quality between the two earphones) when the main beam of the directional pattern points to the direction (the direction corresponding to the direction 130) that the earphone rod is far away from the earphone head is better than when the main beam points to the outside of the human head (the direction corresponding to the direction 120).

In view of the above, the present application provides a bluetooth headset and a bluetooth headset system.

Fig. 15 and fig. 16 are schematic structural diagrams of a bluetooth headset according to an embodiment of the present application. It should be understood that the structure of the bluetooth headset shown in fig. 15 and 16 is provided only for the purpose of making the solution of the present application clearer, and is not intended to limit the specific form and components of the bluetooth headset.

As shown in fig. 15 and 16, a bluetooth headset 1500 provided by an embodiment of the present application may include a headset stem 1510 and a headset head 1520.

The headset stem 1510 may include an antenna 1511 and a motherboard 1512.

The particular and type of antenna 1511 may be selected according to the actual design. For example, a monopole form of the antenna may be selected. In some embodiments, the antenna 1511 may be an inverted-L antenna. The use of an inverted-L antenna can effectively save space. In other embodiments, an inverted-F antenna may also be used in order to maintain the resonant characteristics of the antenna and enhance antenna performance. The inverted F antenna may also be referred to as an IFA antenna.

The shape of the radiator of the antenna 1511 may be set according to actual needs and simulation results. For example, the radiator of the antenna 1511 may be provided in a straight line type. For another example, in order to reduce the volume of the earphone rod and ensure that the length of the radiator of the antenna 1511 satisfies a quarter wavelength, a U-shaped bending portion 1511-a may be disposed at an end of the antenna 1511 away from the earphone head.

The extending direction of the antenna can be arranged according to the design requirement. For example, the antenna may be extended along the length of the earphone stem.

The motherboard 1512 can be selected according to actual needs. A bluetooth module (not shown) may be included on the motherboard 1512. The antenna 1511 may receive a bluetooth signal transmitted by the bluetooth module to transmit an electromagnetic wave corresponding to the bluetooth signal to the outside. The bluetooth module may refer to, for example, a bluetooth chip.

The specific connection mode of the motherboard 1512 and the antenna 1511 may be selected according to the actual design. For example, the motherboard 1512 may be coupled to the antenna 1511 via antenna clips 1514. The antenna dome 1514 may be soldered to the motherboard 1512 by solder pads.

In some embodiments, a touch sensor 1513 may also be included in the headset stem. The touch sensor 1513 may be located inside the headphone stem 1510. The touch sensor 1513 may be configured as required. For example, the touch sensor 1513 may be in a sheet shape.

The specific location of the placement of the touch sensors 1513 in the headphone stem 1510 can be selected according to design needs. For example, touch sensor 1513 may be disposed on a side above the antenna near the earpiece. In some embodiments, the touch sensor 1513 may be connected to the motherboard 1512 by a dome 1517.

Since the touch sensor 1513 is a metal device, the touch sensor 1513 can act as a conductor to electromagnetically couple with the antenna 1511 such that the main beam of the antenna is directed along the pole to the side away from the headset head 1520.

When the headset is worn, the radiated energy will be superimposed because the surface current on the touch sensor 1513 is co-directional with the current on the antenna 1511 and the two are closer together. At this time, the touch sensor 1513 located at the side of the antenna 1511 near the earphone head may form a dual-array with the antenna 1511. A dual array may also be referred to as a binary array. The beam pointing of this dual array is along the wave lag direction, i.e., the direction of the end of the earphone rod 1510. The direction of the end of the earphone rod 1510 refers to the direction in which the earphone rod 1510 is away from the earphone head 1520.

During use of a bluetooth headset, the handset is typically located below the headset. Therefore, the main beam of the antenna is directed to the end direction of the earphone rod 1510, so that the communication quality between the bluetooth earphone and the mobile phone can be enhanced.

In order to achieve the best radiation effect, the touch sensor 1513 and the antenna 1511 may be attached to the inner wall of the earphone case through a Flexible Printed Circuit (FPC).

A microphone 1515 and a charging pad 1516 may also be included on the earphone stem 1510. The microphone 1515 and the charging pad 1516 are metallic devices, and therefore, these metallic devices can be used as conductors to electromagnetically couple with the antenna 1511, so as to enhance the radiation performance of the antenna 1511. For example, microphone 1515 and charging pad 1516 may increase the radiation efficiency of antenna 1511 through electromagnetic coupling effects.

As shown in fig. 15 and 16, the bluetooth headset 1500 may further include a headset head 1520. The earpiece head 1520 may be located at one end of the earpiece stem 1510. The headset head 1520 may include an in-ear sensor 1521. The in-ear sensor 1521, as a conductor device, may generate an electromagnetic coupling effect with the antenna 1511 to improve the efficiency of the antenna, thereby further improving the overall efficiency of the bluetooth headset.

When the headset is not worn, the electromagnetic coupling effect created by in-ear sensor 1520 and antenna 1511 causes the antenna main beam to be directed away from the side of the headset head 1520. For example, the main beam of the antenna may be directed in the angled direction of the headphone head 1520 and the headphone stem 1510. The angular direction can be referred to the corresponding description of fig. 1.

The in-ear sensor 1521 may be shaped as desired. For example, the in-ear sensor 1521 may be in the form of a sheet. In some embodiments, in-ear sensor 1521 may curve around the earpiece.

Through changing the direction of the main beam, the direction of the main beam is changed from being perpendicular to the earphone rod to be the direction of an included angle between the earphone head 1520 and the earphone rod 1510, the directivity of the antenna beam of the Bluetooth earphone is effectively improved, and the strength of a signal penetrating through the ear is enhanced. The intensity of the penetrating signal to the ear may refer to the intensity of a signal transmitted from an earphone worn on the left ear of the human body, which penetrates the human body to reach the right ear of the human body.

As can be seen from the foregoing description, in addition to the requirement for communication with a terminal device (e.g., a handset), communication between two bluetooth headsets is also required. Therefore, in this embodiment of the application, through the special setting of in-ear sensor 1521 for the main beam direction of antenna 1511 becomes the contained angle direction of pointing to earphone head 1520 and earphone pole 1510 from perpendicular to earphone pole, can further improve the communication quality between two bluetooth headset on the basis of improving bluetooth headset and cell-phone communication, thereby promote user experience.

The in-ear sensor 1521 may be coupled to the motherboard 1512 in a variety of ways. For example, the ear-in sensor 1521 may be connected to a motherboard via a board-to-board connector (BTB) 1530.

The board-to-board connector 1530 may be an FPC. The FPC is used as a board-to-board connector, and the FPC is a larger conductor when transmitting signals to a device (e.g., the ear sensor 1521) and a main board, and can be used for transmitting electromagnetic waves corresponding to bluetooth signals. That is, when the FPC is used as the board-to-board connector 1530 to connect the in-ear sensor 1521 and the main board 1512, the FPC may also generate an electromagnetic coupling effect with the antenna, so as to improve the beam pointing direction of the antenna and further improve the communication quality of the bluetooth headset.

The earphone 1500 may further include a magnet 1522, a speaker 1523, a battery 1524, and other metal devices. The metal devices may be connected to a motherboard 1512. The connection mode can be set according to the requirement. For example, the metal devices may be connected to the motherboard by a board-to-board connector 1530.

During the process of transmitting electromagnetic waves by the antenna 1511, the metal component in the earphone 1500 can perform electromagnetic coupling on the electromagnetic waves. By electromagnetic coupling, the pattern of the antenna 1511 is improved. The main beam of the antenna 1511 is directed away from the side of the headset head, for example by electromagnetic coupling.

This application utilizes the electromagnetic coupling effect of metal device and antenna through the inside metal device's of abundant optimization bluetooth headset design of piling up, can promote the overall efficiency of earphone (for example, promote the radiation efficiency of earphone antenna), simultaneously, can also optimize the directional diagram of antenna, improves the communication quality of earphone.

This application can make the directional direction wireless communication of radiation pattern of bluetooth headset antenna need the direction, and maximum reinforcing wireless communication's stability reduces because the cell-phone is placed the communication card that the signal in the pocket weakens and cause and pause the problem.

Because the radiation receiving capacity of the earphone to the upper part of the human body and the periphery is reduced, the Bluetooth earphone provided by the application can also reduce the interference level of other wireless communication products (such as a base station, a wifi router and the like) to the earphone, and reduce the interference of the earphone to other equipment.

The directional optimization of the antenna directional diagram improves the electromagnetic compatibility of the Bluetooth headset and the whole wireless communication system.

The solution of the present application was described above in connection with fig. 15 and 16. The following takes the specific bluetooth headset corresponding to fig. 15 and 16 as an example, and introduces simulation results of this embodiment.

As shown in fig. 15 and 16, the bluetooth headset 1500 includes a headset stem 1510 and a headset head 1520.

The earphone stem 1510 includes an antenna 1511, a main board 1512, a touch sensor 1513, a microphone 1515, and a charging pad 1516. The antenna 1511 is in the form of a monopole antenna. The end of the antenna 1511 away from the earphone head 1520 has a U-shaped bending part 1511-a. The antenna 1511 is connected to the motherboard 1512 by antenna clip 1514, which feeds at one end near the headset head. The touch sensor 1513 is connected to the main board through the elastic sheet 1517. The antenna 1511 and the touch sensor 1513 are attached to the inner wall of the earphone housing by using one FPC (not shown).

The headset head 1520 includes an in-ear sensor 1521, a magnet 1522, a speaker 1523, and a battery 1524. The ear sensor 1521, the magnet 1522, the speaker 1523, and the battery 1524 are connected to the motherboard via a board-to-board connector 1530. The board-to-board connector 1530 may be a flexible circuit board.

As shown in fig. 17 and 18, in the free space state, a bluetooth signal (e.g., a radio frequency signal) emitted by the bluetooth module feeds energy to a pad under the antenna clip along a coplanar waveguide transmission line (not shown) on the main board 1512, and a high-frequency current is transmitted to the antenna through the antenna clip, and meanwhile, opposite-phase currents are distributed on the ground of the main board. As shown in fig. 17, in free space, high-frequency current is mainly distributed to the antenna 1511, the board-to-board connector 1530, and the motherboard 1512. The current on the touch sensor 1513 and the in-ear sensor 1521 is small.

As can be seen from the foregoing description, the radiation pattern of the antenna is strongly correlated with the current distribution. By simplifying the distributed current on the earphone, the shape of the directional pattern can be determined.

The currents on the antenna 1511 and the motherboard 1512 are vertically distributed, and have a cancellation effect due to the opposite phases. The closer the antenna 1511 is to the motherboard 1512, the more pronounced the anti-phase cancellation. The current on the board-to-board connector 1530, the battery 1524, the ear sensor 1521, and the like may be equivalent to the straight line current shown in fig. 19 (a). The simplified current distribution is similar to a dipole antenna with two arms at 120 deg. angle. As shown in fig. 19(b), the radiation pattern main beam should be directed onto the bisector of the two current arms.

Fig. 20 is a life simulation pattern of the antenna of the bluetooth headset of fig. 15. As shown in fig. 20(a) and 20(b), when the earphone is vertically placed, the directional pattern in the free space state is similar to that of a dipole antenna with a radiation arm angle of 120 °. Because the main beam is inclined at a certain angle, the energy absorption radiated to the head of a person by the earphone is weakened when the earphone is worn.

Meanwhile, since tissue fluid, bones, skin and the like of a human body are all substances with high dielectric constants, and air is a substance with a low dielectric constant, the electric field energy in the electromagnetic waves can be reflected very strongly at the interface between the air and the human body due to the change of the dielectric impedance. The reflected energy acts on conductors such as the earphone main board again to form secondary radiation. Therefore, when a human body exists around the near field of the antenna of the earphone, the current distribution on each conductor will change greatly, and the radiation pattern will also change greatly.

Fig. 21 shows the surface current distribution after the earphone is worn on the human ear. As the earphone head part penetrates deep into the ear canal, the current on conductors inside the earphone head, such as the in-ear sensor 1521, the battery 1524, is reduced to a very low level compared to the free space state. The current on touch sensor 1513 is intensified. The surface current created by the touch sensor 1513 is in phase with the current on the body of the antenna 1511. And the two are close to each other, and the radiation energy can be superposed to form a binary array. The beam pointing direction of this binary array is along the wave lag direction, i.e. the direction of the ear-stem end.

Fig. 22 is a directional pattern of the antenna when the earphone shown in fig. 15 is worn. As shown in fig. 22(a) and 22(b), when the earphone is worn on the ear of a person, the energy of the radiated wave from the earphone antenna is significantly increased downward toward the lower part of the human body through interaction, and the main beam direction is directed downward. Because the main beam points to the lower part of the human body, the antenna provides about 3-5dB of gain, and the earphone can achieve the same communication effect by only needing 30% -50% of the original energy.

The present application further provides a bluetooth headset system, which includes a charging box and the aforementioned bluetooth headset.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed system and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (12)

1. A Bluetooth headset comprises a headset rod and a headset head, and is characterized in that an antenna, a mainboard and a first metal device are arranged inside the headset rod, the first metal device is positioned on one side of the antenna, which is close to the headset head, and is electrically connected with the mainboard, wherein the antenna is used for receiving and transmitting electromagnetic waves;

the earphone head is positioned at one end of the earphone rod and comprises a second metal device, and the second metal device is electrically connected with the mainboard;

in the process that the antenna emits electromagnetic waves, the first metal device, the second metal device and the antenna generate an electromagnetic coupling effect, and under the electromagnetic coupling effect, a main beam of the antenna points to one side far away from the earphone head along the earphone rod.

2. The bluetooth headset of claim 1, wherein the first metal component forms a dual-element with the antenna when the headset is worn, a main beam of the dual-element being directed towards an end of the headset stem.

3. The bluetooth headset of claim 1, the first metal device comprising a touch sensor.

4. The bluetooth headset of claim 3, wherein the touch sensor is sheet-like.

5. The bluetooth headset of claim 1, wherein the inside of the headset stem further comprises a first FPC, and the first metal device and the antenna are attached to the inner wall of the headset stem through the first FPC.

6. The bluetooth headset of claim 1, wherein the second metal component comprises an in-ear sensor electrically connected to the motherboard via a board-to-board connector, and a main beam of the antenna is directed between an extending direction of the headset head and an extending direction of the headset stem under an electromagnetic coupling effect when the bluetooth headset is not worn.

7. The bluetooth headset of claim 6, wherein the in-ear sensor arcs around the headset head.

8. The bluetooth headset according to claim 6, wherein the second metal device further comprises at least one of a battery, a speaker, and a magnet.

9. The bluetooth headset of claim 1, wherein the first metal device further comprises at least one of a charging contact, an antenna spring, and a microphone.

10. The bluetooth headset of claim 1, wherein the antenna is an inverted L-shaped or inverted F-shaped antenna and extends along a length of the headset stem.

11. The bluetooth headset of claim 1, wherein one end of the antenna away from the headset head is provided with a U-shaped bending part.

12. A bluetooth headset system, comprising:

a charging box; and

a bluetooth headset according to any one of claims 1 to 11.

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