Open type earphone

Abstract

The utility model discloses an open type earphone, which comprises a first cabin body, a loudspeaker single body, a second cabin body and a connecting part, and is characterized in that the first cabin body is provided with a sound outlet hole; the loudspeaker single body is accommodated in the first bin body and divides the space in the first bin body into a front cavity and a rear cavity, and the front cavity is communicated with the sound outlet hole; a Helmholtz resonant cavity is formed in the second bin body; two ends of a connecting part are respectively connected with the first bin body and the second bin body, a Helmholtz channel is arranged in the connecting part, one end of the Helmholtz channel is communicated with the front cavity, and the other end of the Helmholtz channel is communicated with the Helmholtz resonant cavity. According to the technical scheme, the technical problem that an open type earphone is poor in hearing feeling can be solved.

Description

Technical Field

[0001] This application relates to the technical field of earphones, and particularly to an open earphone. Background Art

[0002] With the progress of technology and the increasing demand of consumers for the wearing comfort and safety of earphones, open earphones have gradually become an important category in the market. The main feature of the open earphone design is that it does not completely enclose the ear canal, but places the sound-emitting part outside the ear canal. Such a design allows the wearer to perceive external sounds while enjoying the sound of the earphone, which is particularly crucial for scenarios such as outdoor sports and driving, and can significantly improve the user's safety and wearing comfort.

[0003] However, for open earphones, due to the certain distance between the sound-emitting part and the ear canal, when the sound signal is emitted from the earphone and propagates through the air to the ear canal opening, it will be affected by the ear canal structure and generate resonance. This resonance will cause the sound signal in the mid-high frequency band to be over-amplified, making the sound sound harsh and lacking fineness. At the same time, ear canal resonance may also cause sound distortion, making it impossible for open earphones to obtain ideal sound quality. Utility Model Content

[0004] The embodiments of this application provide an open earphone, which can solve the technical problem of poor sound perception of open earphones.

[0005] The embodiments of this application provide an open earphone, which includes a first housing, a speaker unit, a second housing, and a connecting part. The first housing has a sound outlet hole; the speaker unit is accommodated in the first housing and divides the space in the first housing into a front cavity and a rear cavity, and the front cavity communicates with the sound outlet hole; a Helmholtz resonance cavity is provided in the second housing; both ends of the connecting part are respectively connected to the first housing and the second housing, and a Helmholtz channel is provided in the connecting part. One end of the Helmholtz channel communicates with the front cavity, and the other end of the Helmholtz channel communicates with the Helmholtz resonance cavity.

[0006] Based on the open earphone of the embodiment of the present application, by arranging a Helmholtz channel in the connecting part to respectively communicate with the front cavity of the first housing and the Helmholtz resonance cavity of the second housing, thus generating a Helmholtz resonance effect through the synergistic effect of the Helmholtz channel and the Helmholtz resonance cavity. During this process, the sound wave energy in the front cavity is effectively consumed in the Helmholtz channel, which not only reduces the direct impact of the sound wave energy on the inner cavity of the wearer's ear, but also effectively suppresses the sudden increase in the peak resonance frequency by absorbing the sound energy around the resonance peak, thereby making the frequency response curve of the sound more flat, realizing resonance silencing in the mid-high frequency band, ensuring the faithful restoration of music, being beneficial to improving the sound quality of the open earphone, and enhancing the listening experience of the wearer when using the open earphone. At the same time, for the design of active noise reduction of the open earphone, since the frequency response in the mid-high frequency band is smooth and the corresponding phase change is also more flat, this greatly simplifies the debugging process of the filter and reduces the debugging difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0008] Figure 1 It is a schematic structural diagram of an embodiment of the open earphone of the present application;

[0009] Figure 2 It is an exploded structural diagram of an embodiment of the earclip earphone of the present application;

[0010] Figure 3 It is a schematic cross-sectional structural diagram of an embodiment of the open earphone of the present application;

[0011] Figure 4 It is a schematic cross-sectional structural diagram of another perspective of the open earphone of the present application.

[0012] Explanation of the reference numerals in the drawings:

[0013] 100, open earphone; 10, first housing; 11, sound-emitting shell; 111, sound outlet hole; 112, second communication port; 113, tuning hole; 12, cover body; 10A, front cavity; 10B, rear cavity; 20, speaker unit; 30, second housing; 31, housing body; 311, first communication port; 312, installation groove; 32, housing cover; 30A, first cavity; 30B, second cavity; 30a, Helmholtz resonance cavity; 40, connecting part; 40A, Helmholtz channel; 50, electronic control component; 51, battery; 52, control circuit board; 60, earclip space.

[0014] The realization of the objectives of this application, its functional features and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0015] To make the objectives, technical solutions and advantages of this application clearer, the following will further describe in detail the embodiments of this application in conjunction with the accompanying drawings.

[0016] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with this application. On the contrary, they are merely examples of devices and methods consistent with some aspects of this application as detailed in the appended claims.

[0017] In the description of this application, it should be understood that terms such as "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art belonging to the technical field of this application. The terms used in the description of this specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0019] With the progress of technology and the increasing demand of consumers for the wearing comfort and safety of headphones, open headphones have gradually become an important category in the market. The main feature of the open headphone design is that it does not completely enclose the ear canal, but places the sound - generating part outside the ear canal. Such a design allows the wearer to enjoy the headphone sound while also maintaining the perception of external sounds, which is particularly crucial for scenarios such as outdoor sports and driving, and can significantly improve the user's safety and wearing comfort.

[0020] However, for open-ear headphones, since there is a certain distance between the sound-emitting part and the ear canal, when the sound signal is emitted from the headphones and propagates through the air to the ear canal opening, it will be affected by the ear canal structure and resonate. This resonance will cause the sound signal in the mid-high frequency band to be overly amplified, making the sound harsh and lacking in fineness. At the same time, ear canal resonance may also cause sound distortion, making it impossible for open-ear headphones to obtain ideal sound quality.

[0021] To solve the above problems, the present application proposes an open-ear headphone 100. Understandably, generally two open-ear headphones 100 are provided in a set, and the two open-ear headphones 100 are symmetrically arranged. The two open-ear headphones 100 can be correspondingly worn on the left and right ears of the user. The open-ear headphone 100 should at least have a wearing state, and the wearing state is a state in which the open-ear headphone 100 cooperates with the user's ear to be relatively fixed to the ear. In this state, the user can obtain a relatively ideal listening effect.

[0022] Referring to Figures 1 to 3 , the open-ear headphone 100 includes a first housing 10, a speaker unit 20, a second housing 30, a connecting part 40, and an electronic control component 50.

[0023] Among them, the first housing 10 has a sound outlet hole 111, and the speaker unit 20 is received in the first housing 10, and divides the space in the first housing 10 into a front cavity 10A and a rear cavity 10B, and the front cavity 10A communicates with the sound outlet hole 111. Thus, in the wearing state, the first housing 10 is used to be close to the ear canal opening of the wearer, so that the sound emitted from the sound outlet hole 111 can be easily heard by the wearer. The shape of the sound outlet hole 111 can be circular, square, strip-shaped, etc., and the embodiments of the present application do not limit this.

[0024] The speaker unit 20 is used to convert the received electrical signal into audible sound waves. The speaker unit 20 includes, but is not limited to, electroacoustic conversion devices such as dynamic speakers, balanced armature speakers, Mems (Micro-Electro-Mechanical System) speakers, vibrators, and planar speakers.

[0025] The connecting portion 40 is C-shaped or quasi-C-shaped, and the two ends of the connecting portion are respectively connected to the first compartment body 10 and the second compartment body 30, and a Helmholtz channel 40A is provided in the connecting portion 40. The connecting portion 40 can be made of hard plastic or metal. These materials also have sufficient rigidity and stability to support the overall structure of the earphones and resist bending and twisting in daily use, so that the first compartment body 10 / the second compartment body 30 and the connecting portion 40 can maintain a specific shape when not worn, and generate a clamping force when worn. At the same time, hard plastic and metal also have good wear resistance and corrosion resistance, and can maintain stable performance in various environments.

[0026] Reference Figures 1 to 3 In one structural form, the connecting portion 40 is a curved ear hook, and the first compartment 10 and the second compartment 30 are arranged opposite to each other to form an ear clip space 60 for clamping the ear of the wearer. In this way, when the wearer is in the wearing state, the first compartment 10, the second compartment 30 and the connecting portion 40 cooperate to generate a clamping force. In the wearing state, the first compartment 10 is located in the concha cavity or partially in the concha cavity, and the second compartment is located at the rear side of the auricle, such as the rear side of the helix or the rear side of the antitragus. In this way, the auricle is mainly clamped by the cooperation of the first compartment 10 and the second compartment 30 to maintain the position of the ear.

[0027] In another structural form, the connecting portion 40 is a curved ear hook, and the connecting portion 40 is used to hang on the ear of the wearer so that the sound outlet 111 of the first chamber 10 is arranged toward the ear canal opening of the wearer. In this way, by making the connecting portion 40 curved, the connecting portion 40 can contact the front and back sides of the ear when worn to achieve clamping and fixing with the ear, so that the first chamber 10 connected to one end of the connecting portion 40 can be relatively stably arranged on the front side of the ear. In this way, the open earphone 100 is worn in an ear-hanging style. It can be understood that the connecting portion 40 has a certain elasticity so that the user can bend the connecting portion 40 to fit the wearer's ear more closely. When the open earphone 100 is worn on the ear, the first chamber 10 covers the ear canal opening of the ear. It can be understood that covering refers to covering in a broad sense, and the position of the first chamber 10 roughly corresponds to the position of the ear canal opening of the ear, but does not extend into the ear canal opening of the ear.

[0028] The outer contours of the first warehouse body 10 and the second warehouse body 30 can be approximately cylindrical or rectangular. The first warehouse body 10 and the second warehouse body 30 can be made of plastic or metal materials to meet the ability to withstand various tests such as falling, twisting and sitting pressure without being damaged. It should be noted that the materials of the first warehouse body 10 and the second warehouse body 30 are not limited to a certain type. The materials of the first warehouse body 10 and the second warehouse body 30 commonly used in the field can be applied to the embodiments of the present utility model, and they are not listed one by one here.

[0029] Referring to Figures 1 to 3 , a Helmholtz resonance cavity 30a is provided in the second housing 30. One end of the Helmholtz channel 40A in the connecting portion 40 communicates with the front cavity 10A, and the other end of the Helmholtz channel 40A communicates with the Helmholtz resonance cavity 30a. Wherein, the Helmholtz channel 40A extends along the length extension direction of the connecting portion 40, so that the path of sound waves propagating from the front cavity 10A to the Helmholtz resonance cavity 30a can be effectively extended. When the Helmholtz channel 40A is extended, the multiple reflections and superpositions of sound waves in the channel can further enhance this resonance effect, so that the sound at this frequency is enhanced or suppressed, thereby improving the sound quality.

[0030] Based on the open earphone 100 of the embodiment of the present application, by providing a Helmholtz channel 40A in the connecting portion 40 to respectively communicate the front cavity 10A of the first housing 10 and the Helmholtz resonance cavity 30a of the second housing 30, so that a Helmholtz resonance effect is generated through the synergistic effect of the Helmholtz channel 40A and the Helmholtz resonance cavity 30a. During this process, the sound wave energy in the front cavity 10A is effectively consumed in the Helmholtz channel 40A. This not only reduces the direct impact of the sound wave energy on the inner cavity of the wearer's ear, but also effectively suppresses the sudden increase in the peak resonance frequency of the resonance peak by absorbing the sound energy around the resonance peak, so that the frequency response curve of the sound is flatter, realizing resonance-type sound cancellation in the mid-high frequency band, ensuring the faithful reproduction of music, being beneficial to improving the sound quality of the open earphone 100, and improving the listening experience of the wearer using the open earphone 100. At the same time, for the active noise reduction design of the open earphone 100, since the frequency response of the mid-high frequency band is smoother and the corresponding phase change is also flatter, this greatly simplifies the debugging process of the filter and reduces the debugging difficulty.

[0031] Optionally, the equivalent diameter of the Helmholtz resonator 30a is greater than the diameter of the Helmholtz channel 40A. It should be noted that when the Helmholtz resonator 30a can be in a spherical shape, its equivalent diameter directly corresponds to the physical diameter of the sphere. When the Helmholtz resonator 30a is arranged in a spherical shape. First of all, from the perspective of acoustic principles, the spherical Helmholtz resonator 30a has uniform curvature characteristics in all directions, making the propagation of sound waves in the cavity more stable, reducing unnecessary reflections and standing waves, and thus achieving a purer resonance effect. Compared with other shapes such as cubes or cylinders, the spherical design often brings a lower resonance frequency, which means that within the same physical space, the spherical Helmholtz resonator 30a can resonate more effectively in the low-frequency band, broadening its application range. Secondly, the spherical structure exhibits excellent stability in mechanics. It can evenly disperse external pressure and reduce the performance degradation caused by structural deformation, which is particularly important for acoustic devices that need to withstand a certain mechanical load. In addition, the spherical design also simplifies the processing process. Although the specific difficulty depends on the selected material and manufacturing process, generally speaking, the spherical profile is easier to achieve through efficient methods such as die forming, improving production efficiency and cost control ability. Of course, in other embodiments, the Helmholtz resonator 30a can also be arranged in the shape of a rectangular body, etc.

[0032] For a cavity structure where the Helmholtz resonator 30a is non-spherical, the equivalent diameter is an important parameter for describing its shape and size. It is not the actual physical diameter of the cavity in a certain direction, but a diameter value calculated based on a certain equivalent principle. Since the equivalent diameter of the Helmholtz resonator 30a is greater than the diameter of the Helmholtz channel 40A, the acoustic energy is amplified when it enters the Helmholtz resonator 30a from the Helmholtz channel 40A and is further enhanced during propagation. This design not only improves the loudness of the sound but also improves the sound quality, making the sound quality more full, clear, and layered. Therefore, by optimizing the size ratio of the Helmholtz resonator 30a and the channel, the sound quality of the open earphone 100 can be further significantly improved, bringing a better auditory experience to users.

[0033] Referring to Figures 1 to 3 , in some structural forms, the second housing 30 has a first cavity 30A and a second cavity 30B that are isolated from each other, and the electronic control component 50 is arranged in the second cavity 30B. It can be understood that a wiring space is provided in the connecting portion 40, so that the electrical connection lines between the electronic control component 50 and the speaker unit 20 can pass through the wiring space to avoid the exposure of the electrical connection lines. Of course, in other embodiments, the electronic control component 50 can also be directly installed in the rear cavity 10B of the first housing 10, so that there is no need to provide a wiring space in the connecting portion 40, thereby further simplifying the structure and reducing the cost.

[0034] In addition, the electronic control component 50 may include a battery 51, a control circuit board 52, etc. The battery 51 supplies electrical energy to the speaker unit 20 and the control circuit board 52. The control circuit board 52 is electrically connected to the speaker unit 20 and controls various functions of the speaker unit 20 through precise electronic signals, such as volume adjustment, sound quality adjustment, etc. In addition, for the convenience of user operation, button switches are also provided on the outer surface of the bin body 31. These button switches are electrically connected to the control circuit board 52. Users can achieve various control functions of the speaker unit 20 by simply pressing the buttons. For example, users can switch songs through the button switches without complex operation steps. At the same time, adjusting the volume is also very easy, just gently rotate or press the volume button. In addition, the power-on and power-off operations can also be easily completed through the button switches, bringing great convenience to users.

[0035] The second bin body 30 is connected to the connecting portion 40, and the Helmholtz channel 40A of the connecting portion 40 communicates with the first cavity 30A, and the first cavity 30A forms a Helmholtz resonance cavity 30a. In this way, the first cavity 30A that is isolated from the second cavity 30B is used as the Helmholtz resonance cavity 30a, so as to prevent the resonance process of the Helmholtz resonance cavity 30a from being affected by the electronic control component 50 in the second cavity 30B and ensure the stability of resonance-type sound absorption.

[0036] Combined with reference to Figures 2 to 4 Furthermore, the second bin body 30 includes a bin body 31 and a bin cover 32. The bin body 31 and the bin cover 32 are connected together to jointly form the second cavity 30B. Among them, the bin body 31 and the bin cover 32 can be connected by detachable means such as screws or buckles. This detachable design makes the bin body 31 extremely convenient in subsequent maintenance and disassembly processes. When it is necessary to maintain, replace, or upgrade the electronic control component 50, simply disassemble the bin cover 32 to easily access the internal electronic control component 50 without complex disassembly of the entire bin body 31. This not only greatly saves maintenance time and costs but also improves the efficiency and convenience of maintenance. The connection method between the bin body 31 and the bin cover 32 also ensures the stability and sealing of the bin body 31. In addition, a sealing member can be provided between the bin body 31 and the bin cover 32 to prevent external dust, moisture, and other impurities from entering the second cavity 30B, thereby protecting the electronic control component 50 from damage.

[0037] The inner wall of the bin body 31 is integrally formed with a first cavity 30A, and the bin body 31 is provided with a first communication port 311 that communicates with the outside and the first cavity 30A. The bin body 31 is connected to the connecting portion 40 so that the first communication port 311 communicates with the Helmholtz channel 40A. In this way, by directly forming the first cavity 30A on the inner wall of the bin body 31, the need for assembling multiple components is reduced, thereby reducing the manufacturing cost and complexity. At the same time, since the first cavity 30A is directly formed by the inner wall of the bin body 31, compared with the method of forming the first cavity 30A by assembly, the first cavity 30A of the present application reduces potential leakage points and improves the overall sealing performance. Due to the reduction in the number of components and potential sealing problems, this design also reduces the maintenance cost and improves the reliability of the equipment. By reducing the setting of additional seals, etc., not only the material cost is reduced, but also the errors and rework generated during the production and assembly processes are reduced.

[0038] Furthermore, an installation groove 312 is recessed on the outer wall surface of the bin body 31, and the first communication port 311 is opened on the bottom wall of the installation groove 312. The connecting portion 40 is inserted into the installation groove 312 so that the first communication port 311 communicates with the Helmholtz channel 40A. In this way, through the installation groove 312 recessed on the outer wall surface of the housing, the connecting portion 40 can be simply inserted and fixed, ensuring the effective communication between the first communication port 311 and the Helmholtz channel 40A. This not only simplifies the manufacturing process, but also reduces the assembly steps, improving the production efficiency and assembly efficiency of the product.

[0039] In another structural form, the cavity of the second bin body 30 is an overall Helmholtz resonance cavity 30a, and the electronic control component 50 is arranged in the Helmholtz resonance cavity 30a. In this way, the advantage of this structure is that the overall volume of the second bin body 30 is utilized. Compared with the embodiment of two independent cavities, this method can obtain a Helmholtz resonance cavity 30a acoustic cavity with a larger volume, thereby optimizing the resonance silencing in the medium and high frequency bands.

[0040] Refer to Figures 2 to 4, optionally, the first housing 10 includes a sound - generating shell 11 and a cover 12 connected to each other. The speaker unit 20 is connected to at least one of the cover 12 and the sound - generating shell 11. The speaker unit 20 and the sound - generating shell 11 define a front cavity 10A, and the speaker unit 20 and the cover 12 define a rear cavity 10B. The sound - generating shell 11 is provided with a sound outlet hole 111. In this way, the speaker unit 20 can be first installed inside the sound - generating shell 11, and then the cover 12 can be fixed to the sound - generating shell 11 by means of screws or buckles. A second communication port 112 communicating with the outside and the front cavity 10A is provided on the side wall of the sound - generating shell 11. The connecting portion 40 is connected to the sound - generating shell 11 so that the second communication port 112 communicates with the Helmholtz passage 40A. Among them, the connecting portion 40 and the sound - generating shell 11 can be fixed by means of insertion, so as to ensure the effective communication between the second communication port 112 and the Helmholtz passage 40A. The advantage of this structure lies in its simplified connection method, without complex docking steps, thus improving the convenience and efficiency of assembly.

[0041] Furthermore, the sound - generating shell 11 is also provided with a tuning hole 113 communicating with the rear cavity 10B to allow air to flow in and out of the rear cavity 10B, thereby preventing pressure accumulation and improving the sound quality. Optionally, the rear cavity 10B of the sound - generating shell 11 is closer to the second housing 30 than the front cavity 10A. The tuning hole 113 is provided on the side of the sound - generating shell 11 opposite to the second housing 30 and can be centrally arranged.

[0042] In addition, the first housing 10 further includes a dust - proof net (not shown). The dust - proof net is connected to the sound - generating shell 11 and covers the sound outlet hole 111 and the tuning hole 113 to prevent external impurities from entering the earphone interior through the sound outlet hole 111, protect the internal sound - generating unit and other components, and extend the service life of the device. Optionally, the dust - proof net is a metal net to enhance the structural strength and durability.

[0043] Furthermore, the sound outlet hole 111 is provided on one side of the sound - generating shell 11, and the orientation of the sound outlet hole 111 is perpendicular to the vibration direction of the speaker unit 20. In this way, the speaker unit 20 vibrates along the central axis of the sound - generating shell 11, and the orientation of the sound outlet hole 111 is the radial direction of the sound - generating shell 11. In the wearing state, the speaker unit 20 vibrates along the direction close to or away from the auricle, while ensuring the sound output effect, facilitating the internal structure arrangement of the first housing 10.

[0044] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0045] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An open earphone, characterized in that, Comprising: A first housing having a sound outlet hole; A speaker unit received in the first housing and dividing the space in the first housing into a front cavity and a rear cavity, the front cavity communicating with the sound outlet hole; A second housing provided with a Helmholtz resonance cavity therein; And A connecting portion having two ends respectively connected to the first housing and the second housing, and a Helmholtz channel provided in the connecting portion, one end of the Helmholtz channel communicating with the front cavity and the other end of the Helmholtz channel communicating with the Helmholtz resonance cavity.

2. The open earphone according to claim 1, characterized in that The equivalent diameter of the Helmholtz resonance cavity is greater than the diameter of the Helmholtz channel.

3. The open earphone according to claim 2, characterized in that, The Helmholtz resonance cavity is spherical in shape.

4. The open earphone according to claim 1, wherein The second housing has a first cavity and a second cavity which are isolated from each other, and the open earphone further includes an electronic control component provided in the second cavity; The Helmholtz channel of the connecting portion communicates with the first cavity, and the first cavity forms the Helmholtz resonance cavity.

5. The open earphone according to claim 4, wherein, The second housing includes a housing body and a housing cover, and the housing body and the housing cover are connected to jointly define the second cavity; The inner wall of the housing body integrally forms the first cavity, and the housing body is provided with a first communication port communicating with the outside and the first cavity, and the housing body is connected to the connecting portion so that the first communication port and the Helmholtz channel communicate.

6. The open earphone according to claim 5, characterized in that, The outer wall surface of the housing body is convexly provided with a mounting groove (concavely provided with a mounting groove), and the bottom wall of the mounting groove is provided with the first communication port, and the connecting portion is inserted into the mounting groove so that the first communication port and the Helmholtz channel communicate.

7. The open earphone according to claim 1, wherein The first housing includes a sounding shell and a cover body connected to each other, the speaker unit is connected to at least one of the cover body and the sounding shell, and the speaker unit and the sounding shell define the front cavity and define the rear cavity with the cover body, and the sounding shell is provided with the sound outlet hole; The side wall of the sounding shell is provided with a second communication port communicating with the outside and the front cavity, and the connecting portion is connected to the sounding shell so that the second communication port and the Helmholtz channel communicate.

8. The open earphone according to claim 7, characterized in that, The sound outlet hole is provided on one side of the sounding shell, and the orientation of the sound outlet hole is perpendicular to the vibration direction of the speaker unit.

9. The open earphone according to any one of claims 1 to 8, characterized in that, The connecting portion is a bent ear clip, and the first housing and the second housing are oppositely arranged to form an ear clip space for clamping the ear of the wearer.

10. The open earphone according to any one of claims 1 to 8, characterized in that, The connecting portion is a bent ear hook, and the connecting portion is used for hanging on the ear of the wearer so that the sound outlet hole of the first housing faces the ear canal opening of the wearer.

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