CN220896822U - Open earphone - Google Patents

Abstract

The present application relates to an open earphone. The open earphone includes: a housing; the circuit board is arranged in the shell; the metal piece is arranged on the shell and is electrically connected with the circuit board so as to realize grounding; and one end of the antenna radiator is connected with the circuit board, and the other end of the antenna radiator is connected with the metal piece so that the circuit board, the metal piece and the antenna radiator form a radiation loop. The technical scheme provided by the application can improve the antenna radiation performance of the open earphone.

Description

Open earphone

Technical Field

The application relates to the technical field of earphones, in particular to an open earphone.

Background

With the rapid development of TWS (True Wireless Stereo), true wireless stereo) headphones, open headphones have also been widely used as a derivative thereof.

The open earphone does not need to close the auditory canal to transmit sound, and the open earphone is mainly transmitted through the vibration of the auditory ossicles or the vibration of the acoustic waves to vibrate the eardrum, so that the auditory canal can be released to the outside, and is called as the open earphone. The open earphone is comfortable to wear, and the size is as small as possible, which is the basic requirement of open earphone design.

However, the existing open earphone often has the problem of poor radiation performance of the antenna, so that the open earphone plays audio, and particularly, the phenomenon of playing clamping easily occurs when playing high-code-rate audio.

Disclosure of Invention

Accordingly, in order to solve the above-mentioned problems, it is necessary to provide an open earphone capable of improving the antenna radiation performance of the open earphone and improving the playing katon problem.

The application provides an open earphone. The open earphone includes:

a housing;

the circuit board is arranged in the shell;

the metal piece is arranged on the shell and is electrically connected with the circuit board so as to realize grounding;

And one end of the antenna radiator is connected with the circuit board, and the other end of the antenna radiator is connected with the metal piece so that the circuit board, the metal piece and the antenna radiator form a radiation loop.

In one embodiment, the metal piece is a metal fixing piece or an FPC flat cable;

The metal fixing piece is used for fixing a part which needs to be fixed in the open earphone, and the FPC flat cable is used for setting a microphone and earphone control keys in the open earphone.

In one embodiment, the circuit board comprises a main circuit board and a secondary circuit board which are electrically connected;

The metal piece and the main circuit board are grounded together; one end of the antenna radiator is connected with the main circuit board, the antenna radiator is arranged in a projection area of the auxiliary circuit board, and a gap exists between the antenna radiator and the auxiliary circuit board.

In one embodiment, the metal piece is the FPC cable, one end of the FPC cable away from the antenna radiator is provided with a plurality of FPC ground pins, the FPC ground pins are in ground communication with the FPC cable, and the FPC ground pins are in ground communication with the main circuit board.

In one embodiment, the metal part is at least a part of a shell, and a shell pin is arranged on the metal part and is communicated with the ground of the main circuit board.

In one embodiment, the distance between the main circuit board and the inner wall of the metal piece is less than 2mm.

In one embodiment, the total length of the antenna radiator and the metal piece is greater than 50mm.

In one embodiment, the other end of the antenna radiator is connected to the metal member through a conductor connection.

In one embodiment, the conductor connecting piece is a metal spring or conductive foam.

In one embodiment, the antenna radiator is U-shaped and comprises a first antenna radiator, a second antenna radiator and a third antenna radiator which are sequentially connected;

The end part of the first antenna radiator, which is far away from the second antenna radiator, is connected with the circuit board, and the end part of the third antenna radiator, which is far away from the second antenna radiator, is connected with the metal piece or the shell.

The open earphone comprises a shell, a circuit board, a metal piece and an antenna radiator; the circuit board is arranged in the shell; the metal piece is arranged on the shell and is electrically connected with the circuit board so as to realize grounding; the antenna radiator is connected with the circuit board at one end, and the other end of the antenna radiator is connected with the metal piece to enable the circuit board, the metal piece and the antenna radiator to form a radiation loop, so that the metal piece in the open earphone is reused, the antenna radiation area is increased, the problem of poor antenna radiation performance caused by smaller whole machine design space of the open earphone and corresponding smaller antenna size in the traditional technology is avoided, the antenna signal intensity can be remarkably improved through increasing the antenna radiation area, and the antenna radiation performance is improved under the condition that the overall size of the open earphone is not increased, and the playing and clamping phenomenon of the open earphone can be improved.

Drawings

FIG. 1 is a schematic view of the structure of an angle inside an open earphone in one embodiment;

FIG. 2 is a schematic view of another angle of the interior of an open earphone according to another embodiment;

FIG. 3 is a schematic view of another angle of the interior of an open earphone according to another embodiment;

FIG. 4 is a schematic view showing a partial structure of an interior of an open earphone according to another embodiment;

fig. 5 is a schematic diagram illustrating S11 return loss simulation results of an antenna radiator using a conventional open earphone and an antenna radiator using an open earphone according to an embodiment of the present application;

Fig. 6 is a diagram illustrating the simulation results of Smith chart of an antenna radiator using a conventional open earphone and an antenna radiator using an open earphone according to an embodiment of the present application;

fig. 7 is a schematic diagram illustrating simulation results of antenna radiation efficiency of an antenna radiator using a conventional open earphone and an antenna radiator using an open earphone according to an embodiment of the present application:

Fig. 8 is a schematic diagram illustrating a simulation result of current distribution of an antenna radiator of an open earphone according to an embodiment of the present application:

Fig. 9 is a schematic diagram illustrating simulation results of radiation efficiency of a head mold of an antenna radiator using a conventional open earphone and an antenna radiator using an open earphone according to an embodiment of the present application.

Reference numerals illustrate:

And (3) a main circuit board: 100; and a secondary circuit board: 200; antenna radiator: 300; a first antenna radiator: 301; a second antenna radiator: 302; third antenna radiator: 303; FPC winding displacement: 400; columnar battery: 500: battery line: 600; horn: 700; BTB:800; conductor connection: 900.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The embodiment of the application provides an open earphone, which comprises a shell, a circuit board, a metal piece and an antenna radiator.

The housing may be a metal shell of an open earphone, and the circuit board is disposed in the housing and is used for realizing communication and signal processing between the open earphone and an external device (such as a terminal).

The metal piece is arranged on the shell and is electrically connected with the circuit board so as to realize grounding. In the embodiment of the application, the metal piece can refer to a metal structural piece arranged in the shell, and also can refer to a part of the shell arranged on the shell. With respect to possible embodiments of the metal part, the following examples will be described.

In the embodiment of the application, the antenna radiator may be an antenna part inherent in the open earphone, or may be a radiator obtained by extending an antenna part inherent in the open earphone. One end of the antenna radiator is connected with the circuit board, and the other end of the antenna radiator is connected with the metal piece so that the circuit board, the metal piece and the antenna radiator form a radiation loop.

In the embodiment of the application, the radiation loop is in a ring state, and the total length of the antenna radiator and the metal piece is more than 50mm, so that the radiation performance of the radiation loop can be further ensured.

In one embodiment, referring to fig. 1, fig. 1 shows a schematic view of the structure of an angle inside an open earphone according to an embodiment of the present application. As shown in fig. 1, the circuit board includes a main circuit board 100 and a sub circuit board 200 connected to each other, the main circuit board 100 may be a PCBA (Printed Circuit Board Assembly ) main board, the sub circuit board 200 is an FPC sub board, and the circuit board is provided in the form of the main circuit board 100 and the sub circuit board 200 due to the size and shape limitation of the open type earphone, so that the arrangement of components inside the open type earphone is facilitated.

On the basis of the embodiment shown in fig. 1, the metal piece and the main circuit board 100 are grounded together, one end of the antenna radiator 300 is connected with the main circuit board 100, a bluetooth chip can be arranged on the main circuit board 100, and one end of the antenna radiator 300 is connected to a radio frequency interface of the bluetooth chip on the main circuit board 100 through an antenna elastic sheet.

In the embodiment of the present application, the antenna radiator 300 is disposed in the projection area of the secondary circuit board 200, and a gap exists between the antenna radiator 300 and the secondary circuit board 200. Referring to fig. 2, fig. 2 is a schematic structural diagram of another angle inside the open earphone in an embodiment, fig. 2 shows a positional relationship between the antenna radiator 300 and the secondary circuit board 200, as shown in fig. 2, the antenna radiator 300 is in a "U" structure, two ends of the "U" structure of the antenna radiator 300 are respectively connected with the main circuit board 100 and the metal piece, so that a formed radiation loop can multiplex the metal piece to radiate, after the bent end of the "U" structure of the antenna radiator 300 extends out of the main circuit board 100, the antenna radiator is suspended in a projection area of the secondary circuit board 200, and the suspended arrangement means that a gap exists between the antenna radiator 300 and the secondary circuit board 200, so that an influence on the radiation performance of the antenna radiator 300 can be avoided when the secondary circuit board 200 works.

Illustratively, the antenna radiator is "U" shaped and includes a first antenna radiator 301, a second antenna radiator 302, and a third antenna radiator 303 connected in sequence; the end of the first antenna radiator 301 far from the second antenna radiator 302 is connected with the circuit board, and the end of the third antenna radiator 303 far from the second antenna radiator 302 is connected with the metal piece or the shell.

As one embodiment, the open earphone includes a distance between the main circuit board 100 and the inner wall of the housing of less than 2mm, ensuring miniaturization of the open earphone.

The inside of the open earphone is also provided with the columnar battery 500, the battery line 600, the loudspeaker 700 and other elements, because of the height limitation of the open earphone (the height of the main circuit board 100 from the inner wall of the upper shell is generally less than 2 mm), the antenna radiator 300 cannot be wired above the main circuit board 100, in the prior art, the antenna radiator 300 can only be arranged in the projection area of the auxiliary circuit board 200, but the length of the projection area is less than 15mm, the antenna radiator 300 is limited by larger size, the radiation performance is poor, the return loss of the antenna is large, the efficiency is lower, the absorption of the skin after the ear wearing is added, and the head mold efficiency in the actual use state is less than 10dB.

The embodiment of the application multiplexes the metal pieces in the open earphone, from the antenna radiator 300 to the metal pieces and from the metal pieces to the circuit board, a large radiation loop is formed, and in the working process of the open earphone, the antenna radiator 300, the metal pieces and the circuit board in the radiation loop are all used as radiators to participate in radiation, so that the antenna radiation area is increased, and the problem of poor antenna radiation performance caused by smaller whole design space and correspondingly smaller antenna size of the open earphone in the traditional technology is avoided.

In the following, possible embodiments of the metal part are described by way of example.

In one embodiment, the metal piece is a part of the shell arranged on the shell, the metal piece is at least a part of the shell, the part of the shell is provided with shell pins, the shell pins are communicated with the ground of the main circuit board, namely, one or more shell pins are led out of the part of the shell, then the shell pins are grounded with the main circuit board in the assembly process of the open earphone, the grounding of the part of the shell is realized, and in the prior art, the earphone shell and the main circuit board are not grounded together.

In another embodiment, in the case that the metal member is a metal structural member disposed in the housing, the metal member may refer to a metal member that is originally grounded to the circuit board in the interior of the open earphone, or may refer to a metal member that is not originally grounded to the circuit board in the interior of the open earphone, but is connected to the ground of the metal member by providing a grounding pin that is connected to the ground of the metal member, and is connected to the ground of the circuit board, so that the metal member and the circuit board are grounded together.

Illustratively, the metal member is a metal mount or FPC (Flexible Printed Circuit ) flex.

First, an FPC cable is introduced, which is used to set a microphone and an earphone control key inside an open earphone.

Referring to fig. 3, fig. 3 is a schematic view illustrating another angle of the inside of the open earphone according to an embodiment of the present application. As shown in fig. 3, the FPC cable 400 is a flexible board partially disposed around the circuit board, and the connection of the FPC cable 400 is provided with a Microphone and an earphone control button, so that the FPC cable 400 may also be referred to as a MIC (Microphone)/button FPC board, the FPC cable 400 has a larger surface area, and two ends of the u-shaped structure of the antenna radiator 300 are respectively connected with the main circuit board 100 and the FPC cable 400, so that the formed radiation loop can multiplex the FPC cable 400 for radiation.

In the case that the metal member is the FPC cable 400, one end of the FPC cable 400, which is far away from the antenna radiator 300, is provided with a plurality of FPC ground pins, which are in communication with the ground of the FPC cable 400, and which are in communication with the ground of the main circuit board 100, thereby realizing the common ground of the FPC cable 400 and the main circuit board 100.

With continued reference to fig. 3, as an embodiment, the FPC cable 400 is fastened to the main circuit Board 100 by a BTB (Board-to-Board Connectors) 800, and a plurality of FPC grounding pins may be disposed on the BTB800 and grounded to the main circuit, so that a large radiation loop is formed from the antenna dome to the antenna radiator 300, the antenna radiator 300 to the FPC cable 400, the FPC cable 400 and the main circuit Board 100 to be commonly grounded, and finally to the main circuit Board 100.

Next, a metal fixing member is described, in this embodiment of the present application, the metal fixing member is used to fix a component to be fixed inside the open earphone, and the metal fixing member may be co-grounded with the main circuit board 100, in this case, no additional processing needs to be performed on the metal fixing member, one end of the antenna radiator 300 is connected to the main circuit board 100, and then the other end of the antenna radiator 300 is connected to the metal fixing member, so that the main circuit board 100, the metal fixing member, and the antenna radiator 300 can form a radiation loop due to the fact that the metal fixing member is co-grounded with the main circuit board 100.

Of course, the metal fixing member may not be commonly grounded to the main circuit board 100, in this case, similar to the processing manner of the above-mentioned part of the housing, a grounding pin is disposed on the metal fixing member, and the grounding pin is in communication with the ground of the main circuit board 100, so as to realize the common grounding of the main circuit board 100 and the metal fixing member, and the main circuit board 100, the metal fixing member and the antenna radiator 300 can form a radiation loop.

In other possible embodiments, the metal piece may be any metal device, metal steel sheet, etc. inside the open earphone, and the metal device, metal steel sheet and the main circuit board 100 are grounded together, so that the metal piece can be reused in a radiation loop, and the radiation area of the antenna is increased.

The metal piece of the embodiment has various implementation modes, and all the metal pieces are elements in the open earphone, so that the circuit in the open earphone is simple and feasible in design, high in flexibility and low in cost.

In one embodiment, please refer to fig. 4, fig. 4 is a partial schematic view of an interior of an open earphone in one embodiment. As shown in fig. 4, the other end of the antenna radiator 300 is connected to a metal member through a conductor connection member 900.

In the embodiment of the present application, a conductor connector 900 is added between the end of the antenna radiator 300 and a metal member (such as the FPC cable 400 shown in fig. 4), where the conductor connector 900 is a metal spring or conductive foam, and the number of the conductor connectors 900 may be multiple or one.

In this way, from the antenna shrapnel to the antenna radiator 300, the antenna radiator 300 to the conductor connecting piece 900, the conductor connecting piece 900 to the metal piece, and the metal piece to the main circuit board 100, the conductor connecting piece 900 is communicated with the ground of the metal piece, that is, the conductor connecting piece 900 is commonly grounded with the metal piece, the metal piece is communicated with the ground of the main circuit board 100, that is, the metal piece is commonly grounded with the main circuit board 100, and the antenna radiator 300 inherent in the open earphone is combined with the existing metal piece in the open earphone, so that a large radiation loop is formed, and the radiation loop is a loop, so that the effective radiation area of the antenna is effectively increased, and the signal intensity is remarkably improved.

In other possible embodiments, the other end of the antenna radiator 300 is welded to the metal member.

The effect of improving the antenna performance of the open earphone according to the embodiment of the present application is described below by experimental data.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating S11 return loss simulation results of an antenna radiator using a conventional open earphone and an antenna radiator using an open earphone according to an embodiment of the present application.

The smaller the S11 return loss value (the ordinate in fig. 5 indicates the S11 return loss value in dB), the better the S11 return loss value, that is, the smaller the reflection of the antenna radiator of the open earphone, and thus the better the radiation performance of the antenna radiator of the open earphone.

In fig. 5, the dashed line represents the curve of the S11 return loss value of the antenna radiator of the open earphone according to the embodiment of the present application, and the solid line represents the curve of the S11 return loss value of the antenna radiator of the conventional open earphone. As can be seen from fig. 5, the S11 return loss value of the antenna radiator of the open earphone according to the embodiment of the present application is far smaller than the S11 return loss value of the antenna radiator of the conventional open earphone, so that the open earphone according to the embodiment of the present application greatly improves the radiation performance of the antenna.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating Smith chart simulation results of an antenna radiator using a conventional open earphone and an antenna radiator using an open earphone according to an embodiment of the present application.

For the Smith chart, we want the reflection coefficient of the open earphone to be better the closer to 0, i.e. closer to the center of the circle.

In fig. 6, the dashed line represents the curve of the reflection coefficient of the antenna radiator of the open earphone according to the embodiment of the present application, and the solid line represents the curve of the reflection coefficient of the antenna radiator of the conventional open earphone. As can be seen from fig. 6, compared with the antenna radiator adopting the conventional open earphone, the reflection coefficient of the antenna radiator adopting the open earphone according to the embodiment of the application is closer to the center of the circle, that is, closer to 0, so that the antenna radiation performance of the open earphone provided by the embodiment of the application is greatly improved.

Referring to fig. 7, fig. 7 is a schematic diagram illustrating simulation results of antenna radiation efficiency of an antenna radiator using a conventional open earphone and an antenna radiator using an open earphone according to an embodiment of the present application.

In fig. 7, the dashed line represents the curve of the antenna radiation efficiency of the antenna radiator of the open earphone according to the embodiment of the present application, and the solid line represents the curve of the antenna radiation efficiency of the antenna radiator of the conventional open earphone. As can be seen from fig. 7, the antenna radiation efficiency of the antenna radiator of the open earphone according to the embodiment of the present application is greater than that of the antenna radiator of the conventional open earphone, and the antenna radiation efficiency is increased by more than 3 dB.

Referring to fig. 8, fig. 8 is a schematic diagram illustrating a simulation result of a circuit current distribution of an antenna radiator of an open earphone according to an embodiment of the present application. As can be seen from fig. 8, due to the increase of the radiating area, the current distribution of the antenna radiator of the open earphone according to the embodiment of the application is more balanced, which is beneficial to improving the working stability of the open earphone.

Referring to fig. 9, fig. 9 is a schematic diagram illustrating simulation results of radiation efficiency of a head mold of an antenna radiator using a conventional open earphone and an antenna radiator using an open earphone according to an embodiment of the present application.

In fig. 9, the dashed line represents the curve of the radiation efficiency of the head mold of the antenna radiator of the open earphone according to the embodiment of the present application, and the solid line represents the curve of the radiation efficiency of the head mold of the antenna radiator of the conventional open earphone. As can be seen from fig. 9, the radiation efficiency of the head die of the antenna radiator of the open earphone according to the embodiment of the present application is greater than that of the antenna radiator of the conventional open earphone, and the effect of the head die on the frequency offset of the open earphone is small, the radiation efficiency of the head die is increased by more than 3dB, so that the high-quality bluetooth music and the long-distance use field Jing Xuqiu can be satisfied, and the user experience is better.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. An open earphone, comprising:

a housing;

the circuit board is arranged in the shell;

the metal piece is arranged on the shell and is electrically connected with the circuit board so as to realize grounding;

And one end of the antenna radiator is connected with the circuit board, and the other end of the antenna radiator is connected with the metal piece so that the circuit board, the metal piece and the antenna radiator form a radiation loop.

2. The open earphone of claim 1, wherein the metal member is a metal fixing member or an FPC flat cable;

The metal fixing piece is used for fixing a part which needs to be fixed in the open earphone, and the FPC flat cable is used for setting a microphone and earphone control keys in the open earphone.

3. The open earphone of claim 2, wherein the circuit board comprises a primary circuit board and a secondary circuit board electrically connected;

The metal piece and the main circuit board are grounded together; one end of the antenna radiator is connected with the main circuit board, the antenna radiator is arranged in a projection area of the auxiliary circuit board, and a gap exists between the antenna radiator and the auxiliary circuit board.

4. An open earphone according to claim 3, wherein the metal member is the FPC cable, one end of the FPC cable remote from the antenna radiator is provided with a plurality of FPC ground pins, the FPC ground pins are in communication with the ground of the FPC cable, and the FPC ground pins are in communication with the ground of the main circuit board.

5. An open ended earphone according to claim 3 wherein the metal member is at least part of a housing, the metal member having a housing pin disposed thereon, the housing pin in communication with the ground of the main circuit board.

6. The open ended earphone of claim 3 or 5 wherein a distance between the main circuit board and an inner wall of the metallic article is less than 2mm.

7. The open ended earphone of claim 1 wherein the total length of the antenna radiator and the metallic member is greater than 50mm.

8. The open earphone of claim 1, wherein the other end of the antenna radiator is connected to the metal member through a conductor connection.

9. The open-ended earphone of claim 8, wherein the conductor connection is a metal dome or a conductive foam.

10. The open earphone of claim 1, wherein the antenna radiator is U-shaped and comprises a first antenna radiator, a second antenna radiator, and a third antenna radiator connected in sequence;

The end part of the first antenna radiator, which is far away from the second antenna radiator, is connected with the circuit board, and the end part of the third antenna radiator, which is far away from the second antenna radiator, is connected with the metal piece or the shell.