Open type earphone

Abstract

The utility model discloses an open type earphone. The open type earphone comprises a sound production part and a fixing structure. The sound production part comprises an ear shell and a sound production unit, the sound production unit is arranged in the ear shell and divides the internal space of the ear shell into a front cavity and a rear cavity, and the ear shell is provided with a sound outlet hole communicated with the front cavity. The fixing structure is connected with the ear shell and is provided with a connecting channel and a resonant cavity, one end of the connecting channel is communicated with the rear cavity, and the other end is communicated with the resonant cavity. The cross section of the connecting channel is smaller than the cross section of the rear cavity and the cross section of the resonant cavity. According to the technical scheme, the low-frequency bass of the open type earphone can be increased, and the sound listening effect is improved.

Description

Technical Field

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

[0002] Currently, open earphone products are attached to the outside of the ear canal. The earphones do not block the ear canal, which not only ensures that consumers can listen to the sound of the earphones but also hear the external sound, with higher safety and comfort.

[0003] However, the open near-field listening method causes serious loss of the low-frequency part of the sound, and it is impossible to obtain ideal sound quality. Summary of the Utility Model

[0004] An embodiment of this application provides an open earphone, which can increase the bass of the low frequency of the open earphone and improve the listening effect.

[0005] The open earphone provided by the embodiment of this application includes:

[0006] A sound generating part, including an ear shell and a sound generating unit. The sound generating unit is arranged inside the ear shell and divides the internal space of the ear shell into a front cavity and a rear cavity. The ear shell is provided with a sound outlet hole communicating with the front cavity; and

[0007] A fixing structure, connected to the ear shell and having a connection channel and a resonance cavity. One end of the connection channel communicates with the rear cavity, and the other end communicates with the resonance cavity;

[0008] Wherein, the cross-sectional area of the connection channel is smaller than the cross-sectional area of the rear cavity and the cross-sectional area of the resonance cavity.

[0009] Based on the above embodiment, the fixing structure has a connection channel and a resonance cavity. One end of the connection channel communicates with the rear cavity, and the other end communicates with the resonance cavity. Since the rear cavity, the connection channel, and the resonance cavity are connected and communicate with each other, when the sound generating unit vibrates, it can push the air in the rear cavity, the connection channel, and the resonance cavity to vibrate together. Compared with the related art, the sound generating unit in the embodiment of this application can push more air to participate in the vibration, improve the quality of the air participating in the vibration, thereby reducing the resonance frequency, obtaining a resonance peak at low frequencies, increasing the low-frequency sound pressure level of the earphone, and improving the low-frequency sound performance of the open earphone.

[0010] Among them, the cross-section of the connecting channel is smaller than that of the rear cavity and the resonance cavity. On the one hand, at the connection between the connecting channel and the rear cavity and the resonance cavity, based on the end effect of the pipeline, the air load during the vibration of the sounding unit can be equivalently increased, further reducing the resonance frequency and improving the bass performance of the earphone; on the other hand, the Helmholtz resonance effect is generated through the synergistic effect of the connecting channel and the resonance cavity. By absorbing the sound energy around the resonance peak, the sudden increase in the peak resonance frequency of the resonance peak is effectively suppressed, so that the frequency response curve of the sound is flatter, which is beneficial to improving the sound quality of the open earphone and enhancing the listening experience of the wearer using the open earphone. Brief Description of the Drawings

[0011] 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 drawings in the following description 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.

[0012] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the open earphone of the present application;

[0013] Figure 2 It is a schematic diagram of the overall structure of another embodiment of the open earphone of the present application;

[0014] Figure 3 It is a schematic diagram of the cross-sectional structure of an embodiment of the open earphone of the present application;

[0015] Figure 4 It is a schematic diagram of the cross-sectional structure of another embodiment of the open earphone of the present application;

[0016] Figure 5 is Figure 3 a partial structure schematic diagram of the open earphone in

[0017] Explanation of the reference numerals in the drawings:

[0018] 100. Open earphone; 10. Sound generating part; 11. Installation cavity; 111. Front cavity; 113. Rear cavity; 12. Tuning cavity; 13. Air guide port; 14. Sound outlet hole; 15. Second air vent hole; 16. Ear shell, 161. Front shell; 163. Rear shell; 165. Partition; 17. Third damping member; 20. Fixing structure; 30. Connection part; 31. Connection channel; 311. Channel section; 313. Chamber; 32. First air vent hole; 33. First damping member; 34. Tuning cotton; 35. Second damping member; 40. Fixing part; 41. Resonance cavity; 42. Accommodation cavity; 43. Rear end housing; 44. Structural board; 45. Third air vent hole; 46. Fourth damping member; 47. Battery; 48. Circuit board; 50. Sound generating unit; 51. Speaker frame; 511. Communication hole; 52. Voice coil; 53. Diaphragm; 54. Magnet.

[0019] The realization of the purpose of this application, functional features and advantages will be further described in conjunction with embodiments with reference to the accompanying drawings. Detailed implementation manners

[0020] To make the purpose, technical solutions and advantages of this application clearer, the following will further describe the embodiments of this application in detail in conjunction with the accompanying drawings.

[0021] When the following description relates 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 only examples of devices and methods that are consistent with some aspects of this application as detailed in the appended claims.

[0022] 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 understood 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 situations. 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 front and rear associated objects.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. 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.

[0024] 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 seal the ear canal, but places the sound - generating part outside the ear canal. The headphone does not block the ear canal, ensuring that consumers can not only listen to the sound of the headphone but also hear external sounds, with higher safety and comfort.

[0025] However, for open headphones, due to the certain distance between the sound - generating part and the ear canal, the low - frequency part of the sound is severely lost in the open near - field listening mode, and it is impossible to obtain ideal sound quality.

[0026] To solve the above problems, an embodiment of this application proposes an open headphone. Understandably, an open headphone should at least have a wearing state. The wearing state is a state in which the open headphone 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.

[0027] Please refer to Figure 1 and Figure 2 , the open headphone 100 includes a fixing structure 20 and a sound - generating part 10 connected to the fixing structure 20. Among them, the fixing structure 20 is used to cooperate with and fix the user's ear, and the sound - generating part 10 is internally provided with a sound - generating unit 50 and is provided with a sound - outlet hole 14 for conducting sound, so that the sound wave generated by the vibration of the sound - generating unit 50 can be conducted to the ear canal opening.

[0028] Exemplarily, the fixing structure 20 includes a connecting part 30 and a fixing part 40. The fixing part 40 is spaced from the sound - generating part 10, and both ends of the connecting part 30 are respectively connected to the sound - generating part 10 and the fixing part 40. As Figure 2 shown, in one structural form, the connecting part 30 is bent, and the sound - generating part 10 and the fixing part 40 are arranged oppositely to form an ear - clip space for clamping the ear. In the wearing state, the sound - generating part 10 is located inside the concha cavity or partially inside the concha cavity, and the fixing part 40 is located behind the auricle. In this way, the sound - generating part 10 and the fixing part 40 cooperate to clamp the auricle and maintain the position on the ear. As Figure 3 shown, in another structural form, the connecting part 30 is bent and is used to hang on the wearer's ear, so that the sound - generating part 10 can be stably arranged on the front side of the ear, realizing the over - the - ear wearing of the open headphone 100.

[0029] Understandably, the connecting portion 30 is a flexible structure to facilitate operations such as the user putting on and taking off the device and adjusting the position of the open earphone 100. Optionally, the connecting portion 30 includes an inner core and an outer sheath. The outer sheath wraps around the inner core, and the outer sheath is made of an elastic material such as silicone or TPU (Thermoplastic polyurethanes), so as to give the user a good tactile feeling. The inner core can be made of a memory metal, such as nitinol, etc., so that in the un-worn state, the open earphone 100 can maintain a specific shape and generate a clamping force when worn. The fixing portion 40 can be configured into various shapes suitable for fitting the skin behind the user's ear or ear, such as a columnar shape or a flat shape. To improve the user's tactile experience, the outer sheath of the fixing portion 40 can also be made of an elastic material such as silicone or TPU. To make the design style of the open earphone 100 consistent and improve the aesthetics, the connecting portion 30 and the fixing portion 40 can use the same outer sheath material, for example, both use silicone material.

[0030] Of course, the fixing structure 20 is not limited to the structural form of the cooperation between the connecting portion 30 and the fixing portion 40. In other exemplary aspects, the fixing structure 20 can also be constructed as a single body and cooperate with the user's ear.

[0031] Combined with Figure 3 , the sound generating portion 10 includes an ear shell 16 and a sound generating unit 50. The ear shell 16 is provided with a sound outlet hole 14. The sound generating unit 50 is arranged inside the ear shell 16 and divides the internal space of the ear shell 16 into a front cavity 111 and a rear cavity 113. The sound outlet hole 14 communicates with the front cavity 111, so that the sound waves generated by the vibration of the sound generating unit 50 are transmitted out from the sound outlet hole 14. In the embodiment of the present application, the sound generating unit 50 includes, but is not limited to, electro-acoustic conversion devices such as a dynamic loudspeaker, a balanced armature loudspeaker, a Mems (Micro-Electro-Mechanical System) loudspeaker, a vibrator, and a planar loudspeaker.

[0032] In the embodiment of the present application, the fixing structure 20 has a connection channel 31 and a resonance cavity 41. One end of the connection channel 31 communicates with the rear cavity 113, and the other end communicates with the resonance cavity 41. Since the rear cavity 113, the connection channel 31, and the resonance cavity 41 are connected and communicate, when the sound generating unit 50 vibrates, it can push the air in the rear cavity 113, the connection channel 31, and the resonance cavity 41 to vibrate together. Compared with the technical solution in the related art where the sound generating unit 50 only pushes the air in the rear cavity 113 to vibrate, the sound generating unit 50 in the embodiment of the present application can push more air to participate in the vibration and improve the quality of the air participating in the vibration.

[0033] According to the formula:

[0034] Among them, f0 represents the resonance frequency, and Mm represents the vibrating mass. It can be understood that as the air mass participating in the vibration increases, that is, the vibrating mass Mm increases, the resonance frequency f0 is thus reduced, a resonance peak at low frequencies is obtained, the low-frequency sound pressure level of the earphone is increased, and the low-frequency sound performance of the open earphone 100 is improved.

[0035] Furthermore, the cross-section of the connection channel 31 is smaller than the cross-sections of the rear cavity 113 and the resonance cavity 41. In this way, on the one hand, at the connection between the connection channel 31 and the rear cavity 113 and the resonance cavity 41, based on the end effect of the pipe, the air load during the vibration of the sound generating unit 50 can be equivalently increased, further reducing the resonance frequency and improving the bass performance of the earphone; on the other hand, through the synergistic effect of the connection channel 31 and the resonance cavity 41, the Helmholtz resonance effect is generated, and by absorbing the sound energy around the resonance peak, the sudden increase in the peak resonance frequency of the resonance peak is effectively suppressed, so that the frequency response curve of the sound is flatter, which is beneficial to improving the sound quality of the open earphone 100 and enhancing the listening experience of the wearer using the open earphone 100.

[0036] The connection channel 31 can be arranged in the connection part 30, and the resonance cavity 41 can be arranged in the fixing part 40. In this way, not only can the structural shape and space of the fixing structure 20 be fully utilized to further increase the air load and optimize the bass effect, but also the formation of the connection channel 31 and the resonance cavity 41 is facilitated, and the production difficulty is reduced. Of course, the connection channel 31 and the resonance cavity 41 can also both be formed by the connection part 30, or be an integral chamber 313 structure in other fixing structures 20 that are not limited to the connection part 30 and the fixing part 40. The embodiments of the present application do not limit this.

[0037] The following continues to be explained in conjunction with the structural form in which the fixing structure 20 includes a connection part 30 and a fixing part 40.

[0038] Combined with Figure 4 , in some embodiments, the connection channel 31 includes a channel section 311 and at least one chamber 313 provided on the channel section 311. Among them, the channel section 311 communicates with the rear cavity 113 and the resonance cavity 41, the chamber 313 is arranged on the extension path of the channel section 311 and communicates with the channel section 311, and the cross-section of the chamber 313 is larger than the cross-section of the channel section 311. The number of chambers 313 can be one or more. When the number of chambers 313 is multiple, the multiple chambers 313 are arranged at intervals along the extension path of the channel section 311, and adjacent two chambers 313 are connected through the channel section 311.

[0039] Specifically, please refer to Figure 4 , Figure 4The connection channel 31 of the open earphone 100 shown includes a chamber 313. The channel segment 311 includes a first channel and a second channel. The first channel communicates the rear cavity 113 and the chamber 313, and the second channel communicates the chamber 313 and the resonance cavity 41. It can be understood that in an embodiment not shown, the channel segment 311 may further include a third channel that communicates two adjacent chambers 313.

[0040] It can be understood that by providing a chamber 313 with a larger cross-section on the channel segment 311, not only can the space of the connection channel 31 be further widened, the volume of air participating in resonance be increased, and the vibration quality be improved, thereby reducing the resonance frequency and optimizing the bass performance, but also the resonance effect of sound waves in the connection channel 31 can be improved, further improving the sound quality.

[0041] Combined with Figure 3 and Figure 4 , the open earphone 100 further includes a first damping member 33, and the first damping member 33 is provided at the connection between the chamber 313 and the channel segment 311. Optionally, the first damping member 33 can be made of rubber or other polymer materials, etc., and is configured in a structure form of a net or a film. Taking the first damping member 33 as a tuning net as an example, the first damping member 33 covers the connection between the chamber 313 and the channel segment 311, and sound waves can pass through the first damping member 33 into the chamber 313 or the channel segment 311. Providing the first damping member 33 can reduce the vibration and noise of the internal structure, improve the clarity and purity of the sound, improve the sound quality and listening experience, and optimize the listening effect.

[0042] In the embodiment shown in Figure 4 , first damping members 33 are provided at both the connection between the chamber 313 and the first channel and the connection between the chamber 313 and the second channel. A first damping member 33 can also be provided at the connection between the channel segment 311 and the rear cavity 113. In addition, a first damping member 33 can also be provided at the connection between the channel segment 311 and the resonance cavity 41. Thus, by adjusting and providing the first damping member 33, the specific frequency response or tone color of the sound can be adjusted, and the sound quality and listening experience can be improved. Of course, the embodiments of the present application do not limit the position and quantity of the first damping member 33 provided, and the first damping member 33 can also be provided at other positions within the channel segment 311, which will not be elaborated here.

[0043] Further, in some embodiments, the open earphone 100 further includes a tuning cotton 34 disposed in the connection channel 31. It can be understood that standing waves may be formed during the continuous reflection of sound waves, affecting the sound quality. The tuning cotton 34 is provided to reduce the reverberation and standing waves of the sound, thereby improving the sound quality. The tuning cotton 34 may have different densities. The higher the density of the tuning cotton 34, the smaller its air permeability and the greater its influence on the sound. By setting the tuning cotton 34 with different densities, the sound balance can be adjusted to make the tone more in line with the user's preference. Thus, by setting the tuning cotton 34, the sound quality can be improved, the listening experience can be enhanced, and the user experience can be improved. Among them, the present application embodiment does not limit the setting position of the tuning cotton 34. Exemplarily, the tuning cotton 34 can be set in the first channel. For the connection channel 31 without the chamber 313, the tuning cotton 34 can be set in the middle part of the connection channel 31.

[0044] Please refer to Figure 4 , in some embodiments, the connecting portion 30 is provided with a first air vent 32 communicating with the connection channel 31. The first air vent 32 allows air to escape from the connection channel 31 to balance the air pressure and improve the sound quality. In the embodiment of the present application, by connecting the first air vent 32 with the connection channel 31, the air in the rear cavity 113 is discharged through the first air vent 32 via the connection channel 31 when the sound generating unit 50 vibrates. Compared with directly connecting the first air vent 32 with the rear cavity 113, the first air vent 32 in this embodiment is farther away from the sound generating unit 50, which can increase the volume of air participating in the vibration and improve the vibration quality, so that the bass performance of the open earphone 100 is better.

[0045] Further, the number of the first air vents 32 is at least two, and at least two first air vents 32 are arranged at intervals along the extending path of the connection channel 31. At least two first air vents 32 can be respectively arranged on the inner walls on different sides of the connection channel 31, or can be arranged on the wall surfaces on the same side of the connection channel 31. In Figure 3 the illustrated embodiment, two first air vents 32 are arranged in the second channel and are arranged at intervals along the extending path of the second channel. For the convenience of description, the first air vent 32 close to the chamber 313 is defined as hole A, and the first air vent 32 far away from the chamber 313 is defined as hole B. The air flow path can be the rear cavity 113 - the first channel - the chamber 313 - the second channel - hole A, and the rear cavity 113 - the first channel - the chamber 313 - the second channel - hole B. Thus, two different air flow paths are formed, which can be regarded as the internal space of the open earphone 100 combining to form two different Helmholtz resonators 41, thereby forming two or more resonance frequencies. Compared with the structural form of a single cavity and a single air flow path, the resonance energy of the sound wave in this embodiment is relatively dispersed, avoiding the appearance of a large resonance peak, thereby avoiding affecting the sound output of the front cavity 111 and making the frequency response curve smoother and the listening effect better.

[0046] The open earphone 100 further includes a second damping member 35, which is disposed at the communication portion between the first vent hole 32 and the connection channel 31. Optionally, the second damping member 35 can be made of rubber or other polymer materials, etc., and is configured in the form of a net or a film. Among them, by adjusting the setting of the second damping member 35, the resonance peak can be reduced, the Q value (quality factor, the higher the Q value, the sharper the resonance peak) can be lowered, and the listening experience can be optimized. It can be understood that when the number of the first vent holes 32 is multiple, a second damping member 35 is provided corresponding to each first vent hole 32. Combining the foregoing, the multiple first vent holes 32, the rear cavity 113, and the connection channel 31 can be configured to form multiple Helmholtz resonance cavities 41, forming multiple resonance frequencies and capable of reducing the Q value of the resonance peak, thereby further ensuring the sound output of the front cavity 111 and improving the sound quality.

[0047] In addition, the near-field listening mode of the open earphone 100 may cause sound leakage. The first vent hole 32 can output sound with a phase difference from the sound outlet hole 14, and cancel out the sound leaking from the sound outlet hole 14 in antiphase, reducing sound leakage. For embodiments provided with multiple first vent holes 32, in the wearing state, the positions and orientations of the multiple first vent holes 32 can be set to be different, so as to reduce sound leakage in multiple directions and improve the user experience.

[0048] Combined with Figures 3 to 5 , in some embodiments, the ear shell 16 is provided with a second vent hole 15 communicating with the rear cavity 113. The second vent hole 15 can also play a role in balancing air pressure. The sound transmitted from the second vent hole 15 can cancel out the sound leaking from the sound outlet hole 14 in antiphase, reducing sound leakage. Optionally, the number of the second vent holes 15 is one or at least two, and at least two second vent holes 15 are arranged at intervals. At least two second vent holes 15 can be configured to face different directions, so as to reduce sound leakage in multiple directions.

[0049] Alternatively, the fixing portion 40 is provided with a third vent hole 45 communicating with the resonance cavity 41. For embodiments provided only with the third vent hole 45, the third vent hole 45 is farther away from the sound generating unit 50, which can increase the volume of air participating in vibration, increase the vibration mass, and improve the bass performance of the open earphone 100. At the same time, the sound transmitted from the third vent hole 45 can cancel out the sound leaking from the sound outlet hole 14 in antiphase, reducing sound leakage. Optionally, the number of the third vent holes 45 is one or at least two, at least two third vent holes 45 are arranged at intervals, and at least two second vent holes 15 can be configured to face different directions, so as to reduce sound leakage in multiple directions.

[0050] It can be understood that the open earphone 100 may be provided with only one of the first air vent 32, the second air vent 15, and the third air vent 45, or the open earphone 100 may also be provided with a combination of two or more of the first air vent 32, the second air vent 15, and the third air vent 45. In the latter case, the open earphone 100 has multiple air vents. When worn, the first air vent 32, the second air vent 15, and the third air vent 45 are located at different positions and can be configured to face different directions, so as to be able to reduce the sound leakage of the open earphone 100 in multiple directions, achieve comprehensive reduction of sound leakage, and improve the user experience. In addition, the first air vent 32, the second air vent 15, and the third air vent 45 can also combine the rear cavity 113, the connection channel 31, and the resonance cavity 41 to form multiple Helmholtz resonance cavities 41, thereby forming multiple resonance frequencies, avoiding the occurrence of large resonance peaks, thus avoiding affecting the sound output of the front cavity 111, making the frequency response curve smoother and the sound listening effect better.

[0051] Furthermore, the open earphone 100 includes a third damping member 17, and the third damping member 17 is provided at the connection between the second air vent 15 and the rear cavity 113. The open earphone 100 may further include a fourth damping member 46, and the fourth damping member 46 is provided at the connection between the third air vent 45 and the resonance cavity 41.

[0052] By providing the second damping member 35, the third damping member 17, and the fourth damping member 46, not only can the listening experience be optimized, but also foreign objects from the outside can be effectively prevented from entering the internal space of the open earphone 100 through the first air vent 32, the second air vent 15, and the third air vent 45, improving the structural reliability.

[0053] In some embodiments, the axis where the vibration direction of the sound generating unit 50 is located is parallel to or forms an angle α with the tangent line at the connection between the connection channel 31 and the rear cavity 113, where 0° ≤ α ≤ 90°. In the embodiment as Figure 3 shown, the part of the connection channel 31 close to the rear cavity 113 presents as a straight channel section 311, and the tangent line at the connection between the connection channel 31 and the rear cavity 113 is parallel to the central axis of the connection channel 31. It can be seen that the axis where the vibration direction of the sound generating unit 50 is located forms a 90° angle with the tangent line at the connection between the connection channel 31 and the rear cavity 113. Or in the embodiment as Figure 4 shown, the axis where the vibration direction of the sound generating unit 50 is located is parallel to the tangent line at the connection between the connection channel 31 and the rear cavity 113. Of course, the angle formed by the axis where the vibration direction of the sound generating unit 50 is located and the tangent line at the connection between the connection channel 31 and the rear cavity 113 can also be 45°, 60°, etc., and the embodiments of the present application do not limit this.

[0054] It can be understood that in some embodiments, the connecting portion 30 is configured to be in a bent shape, such as a "U" shape or a "C" shape, etc. In these embodiments, the connecting channel 31 is also bent, and the tangent line at the connection between the connecting channel 31 and the rear cavity 113 reflects the extending trend of the connecting channel 31 at this end close to the rear cavity 113. Associating the vibration direction of the sound generating unit 50 with the tangent line at the connection between the connecting channel 31 and the rear cavity 113 can reflect the attitude of the sound generating unit 50 relative to the connecting portion 30, that is, different included angles reflect different forms of the open earphone 100.

[0055] Please refer to Figure 3 and Figure 5 , in some embodiments, the internal space of the ear shell 16 includes an installation cavity 11, an air guide port 13, and a tuning cavity 12. The tuning cavity 12 is located beside the installation cavity 11, and the tuning cavity 12 is communicated with the installation cavity 11 through the air guide port 13. The sound generating unit 50 is disposed in the installation cavity 11 and divides the installation cavity 11 into a front cavity 111 and a rear cavity 113. Among them, the sound outlet hole 14 is communicated with the front cavity 111, and the connecting channel 31 is communicated with the tuning cavity 12.

[0056] It can be understood that the cross-section of the part where the rear cavity 113 is connected to the air guide port 13 and the cross-section of the part where the tuning cavity 12 is connected to the air guide port 13 are both larger than the cross-section of the air guide port 13. For example, in a plane parallel to the thickness direction of the ear shell 16, the width of the air guide port 13 is smaller than the width of either the rear cavity 113 or the tuning cavity 12. When the spatial distribution in other dimensional directions of the ear shell 16 is uniform, the cross-section at the air guide port 13 is the smallest, that is, the gas flow area at the air guide port 13 is smaller than the gas flow area of either the rear cavity 113 or the tuning cavity 12, and the air is compressed when flowing through the air guide port 13.

[0057] When the sound generating unit 50 vibrates to generate sound, it pushes the air in the rear cavity 113 to vibrate. The air flows through the air guide port 13 and the tuning cavity 12, and then flows to the connecting channel 31. Regarding the air guide port 13 as a pipe connecting the installation cavity 11 and the tuning cavity 12, at the connection between the air guide port 13 and the installation cavity 11 and the tuning cavity 12, based on the end effect of the pipe, the equivalent air load during the vibration of the sound generating unit 50 can be increased. The equivalent air load is the mass of air or air resistance driven by the diaphragm 53 of the sound generating unit 50 during vibration, which reflects the interaction between the sound generating unit 50 and the surrounding air. The greater the air resistance, the greater the equivalent air load. In this application, the air can flow along the path of the rear cavity 113 - air guide port 13 - tuning cavity 12 - connecting channel 31. The air is compressed when flowing through the air guide port 13, thus increasing the air damping of the vibration, further increasing the equivalent air load of the sound generating unit 50, reducing the resonance frequency, and improving the low-frequency performance.

[0058] In one embodiment, the ear shell 16 includes a shell body and a partition 165 disposed within the shell body. A space is formed inside the shell body, which is adapted to accommodate and protect components such as the sound generating unit 50. The sound outlet hole 14 is provided on the shell body. The partition 165 divides the internal space of the shell body into an installation cavity 11 and a tuning cavity 12. The sound generating unit 50 is disposed in the installation cavity 11. Optionally, the sound generating unit 50 can be connected to the partition 165, that is, the partition 165 is used as a connecting member of the sound generating unit 50, making the structure more compact. One end of the partition 165 and the shell body define an air guiding port 13, so that the rear cavity 113 communicates with the tuning cavity 12.

[0059] Please continue to refer to Figure 5 , in a specific embodiment, for the convenience of production, manufacturing and assembly, the shell body includes a front shell 161 and a rear shell 163. The front shell 161 and the rear shell 163 are connected to jointly define the internal space of the shell body. One end of the partition 165 is connected to the front shell 161, and the other end and a part of the inner wall of the rear shell 163 jointly define the air guiding port 13. The sound outlet hole 14 is provided on the front shell 161, and the third air vent hole 45 can be provided on at least one of the front shell 161 and the rear shell 163. For example, as Figure 5 shown in, the third air vent hole 45 is provided on the rear shell 163.

[0060] In this way, the partition 165 can be used as at least part of the installation base of the sound generating unit 50, and the partition 165 and the shell body are spaced apart to define the tuning cavity 12, increasing the air volume and improving the air load when the sound generating unit 50 vibrates. The partition 165 can effectively divide the rear cavity 113 and the tuning cavity 12, and it is easy to form a narrow air guiding port 13 between the end of the partition 165 and a part of the inner wall of the rear shell 163. While the rear cavity 113 and the tuning cavity 12 are communicated, the air flowing through the air guiding port 13 can be compressed, which is beneficial to mobilize the vibration of all the air in the rear cavity 113 and the tuning cavity 12, thereby improving the bass performance.

[0061] Among them, the partition 165 and the front shell 161 are of an integral structure. For example, the partition 165 and the front shell 161 are integrally injection-molded, with good structural integrity, convenient processing and high production efficiency; or the partition 165 and the front shell 161 and the rear shell 163 can also be connected by means of gluing, snap connection, etc. after being separately formed. The embodiments of the present application do not make any limitations in this regard.

[0062] Further, in the thickness direction of the auricle 16, the air guide port 13 has a width d, satisfying the relationship: 0.02 mm ≤ d ≤ 30 mm. It can be understood that if d < 0.02 mm, that is, the width at the air guide port 13 is too small, so the cross-section is too small and air cannot flow between the rear cavity 113 and the tuning cavity 12, resulting in the failure of the connection channel 31 and the resonance cavity 41, the volume of air participating in vibration becomes smaller, the vibration mass decreases, and the bass performance of the open earphone 100 is affected; if d > 30 mm, when the sound generating unit 5030 vibrates to generate sound, the air in the installation cavity 1110a and the tuning cavity 1210b cannot be fully mobilized, the vibration mass does not increase significantly, and the low-frequency performance does not improve significantly. Therefore, in order to fully increase the air load, increase the vibration mass, and reduce the resonance frequency to obtain better bass performance, the embodiment of the present application limits 0.02 mm ≤ d ≤ 30 mm. Optionally, d can be taken as 5 mm, 8 mm, 10 mm, etc.

[0063] Please refer to Figures 3 to 5 , in some embodiments, the sound generating unit 50 is a dynamic coil loudspeaker, including a chassis 51, a magnetic body 54 and a vibration assembly. The vibration assembly includes a diaphragm 53 and a voice coil 52. The chassis 51 has a receiving cavity and an opening communicating with the receiving cavity. The magnetic body 54 is disposed in the receiving cavity and defines a magnetic gap with the inner sidewall of the receiving cavity. The diaphragm 53 covers the opening and is connected to the chassis 51. The voice coil 52 is located in the receiving cavity and inserted into the magnetic gap, and is connected to the diaphragm 53. When an audio current passes through the voice coil 52, a magnetic field varying with the audio current is generated. This magnetic field interacts with the magnetic field of the magnetic body 54 to cause the voice coil 52 to vibrate and drive the diaphragm 53 to vibrate and generate sound. A communication hole 511 is provided on the chassis 51, and the communication hole 511 communicates the receiving cavity and the rear cavity 113. During the vibration of the diaphragm 53, air flows between the receiving cavity and the rear cavity 113 through the communication hole 511. Commonly, a damping member is provided at the communication hole 511, which can slow down the passing speed of sound waves, thereby enhancing the effect of resonance absorption, making the sound less sharp and having a better listening experience.

[0064] Further, in the structural form where the axis in the vibration direction of the sound generating unit 50 is parallel to the tangent line at the connection of the connection channel 31 and the rear cavity 113, the communication hole 511 is disposed opposite to the connection channel 31, so that when the sound generating unit 50 vibrates, it can more directly push the air in the rear cavity 113, the connection channel 31 and the resonance cavity 41 to participate in vibration, further optimizing the low-frequency performance.

[0065] In some embodiments, the axis in the vibration direction of the sound generating unit 50 is parallel to or forms an angle β with the central axis of the sound outlet hole 14, where 0° ≤ β ≤ 90°. As Figure 3 and Figure 4As shown, the central axis of the sound outlet hole 14 is parallel to the axis where the vibration direction of the sound generating unit 50 is located. The sound wave generated by the vibration of the sound generating unit 50 can directly pass out from the sound outlet hole 14 to ensure loudness. In some embodiments not shown, the sound outlet hole 14 is arranged on one side of the sound generating shell facing the ear canal opening, and the central axis of the sound outlet hole 14 is perpendicular to the vibration direction of the sound generating unit 50. For example, when the sound generating unit 50 vibrates along the central axis of the ear shell 16, the central axis of the sound outlet hole 14 is along the radial direction of the ear shell 16. While ensuring the sound output effect, it is convenient for the internal structure arrangement of the sound generating part 10.

[0066] In the wearing state, the connection line between the center of the sound outlet hole 14 and the center of the ear canal opening is parallel to the central axis of the sound outlet hole 14 or is set at an angle γ, where 0° ≤ γ < 90°. It can be understood that if γ ≥ 90°, the sound output direction of the sound outlet hole 14 deviates greatly from the direction of the user's ear canal opening, which not only easily causes sound leakage, but also affects the loudness and integrity of the sound heard by the user. To avoid the above situation, the embodiments of the present application limit 0° ≤ γ < 90°. Optionally, γ can be 20°, 45°, 50°, etc.

[0067] In addition, in the wearing state, the distance between the center of the sound outlet hole 14 and the center of the ear canal opening is D, satisfying the relationship: 0mm ≤ D < 35mm. It can be understood that the distance between the sound outlet hole 14 of the open earphone 100 and the ear canal opening is greater than or equal to 0mm. If D ≥ 35mm, the sound outlet hole 14 is too far from the ear canal opening, which easily causes sound leakage and affects the sound loudness, etc. To ensure the user's sound listening effect and reduce sound leakage, the present application limits 0mm ≤ D < 35mm, where D can be selected as 5mm, 10mm, 12mm, etc.

[0068] Of course, the number of the sound outlet holes 14 can be at least two. The central axes of at least two sound outlet holes 14 can be arranged in parallel, or the orientations of at least two sound outlet holes 14 are different. In the structural form where the orientations of at least two sound outlet holes 14 are different, when one of the sound outlet holes 14 is blocked by the user's ear, at least one of the other sound outlet holes 14 has a different orientation from the blocked sound outlet hole 14 and is not blocked by the user's ear, so that the sound wave can be conveyed from the unblocked sound outlet hole 14 to the user's ear canal opening, ensuring the user's sound listening effect, improving the robustness of the open earphone 100, making the open earphone 100 have better compatibility, and enabling different consumers to obtain as consistent sound volume as possible.

[0069] The open earphone 100 further includes a battery 47 and a circuit board 48, wherein the battery 47, the circuit board 48 and the sound generating unit 50 are electrically connected. The battery 47 is used to supply power to the sound generating unit 50, and the circuit board 48 is used to control the vibration of the sound generating unit 50. Combined with Figure 3, in some embodiments, the battery 47 and the circuit board 48 are disposed in the fixed structure 20, and in some structural forms, are specifically disposed in the fixing portion 40. Among them, the circuit board 48 is connected to the sound generating unit 50 through a wire, and the wire can be arranged outside the connection channel 31 to reduce the influence on the air vibration in the connection channel 31.

[0070] Specifically, the fixing portion 40 includes a rear end housing 43 and a structural board 44. The rear end housing 43 is connected to one end of the connecting portion 30 away from the ear shell 16. It can be understood that the rear end housing 43, the connecting portion 30, and the ear shell 16 can be separately manufactured and connected together, or a part of the rear end housing 43, the connecting portion 30, and the ear shell 16 can be an integral structure, with good structural integrity. The structural board 44 is disposed inside the rear end housing 43 and divides the internal space of the rear end housing 43 to form a receiving cavity 42 and a resonance cavity 41. The battery 47 and the circuit board 48 are disposed in the receiving cavity 42. It can be understood that the structural board 44 is hermetically connected to the rear end housing 43 to protect the battery 47 and the circuit board 48, improve the waterproof performance of the open earphone 100, and enhance the structural reliability. Among them, the receiving cavity 42 can be further divided into two different sub-cavities, and the battery 47 and the circuit board 48 are respectively located in different sub-cavities to further improve the sealing performance.

[0071] In the previous embodiment, disposing the battery 47 and the circuit board 48 in the fixing portion 40 can reduce the space occupied by the rear cavity 113 of the sound generating portion 10, which is beneficial to reducing the volume of the sound generating portion 10 and improving the vibration quality. In addition, disposing the battery 47 and the circuit board 48 in the fixing portion 40 can also balance the weight of the open earphone 100 front and back, improve the wearing stability, and enhance the user experience.

[0072] Of course, in other embodiments, one or both of the battery 47 and the circuit board 48 are disposed in the sound generating portion 10 to improve the structural integration degree, and the embodiments of the present application do not limit this.

[0073] 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 position relationship, it is based on the orientation or position relationship shown in the drawings. It is 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 position relationship in the drawings are only used for exemplary illustration and cannot be understood as a limitation of the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0074] 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 within the protection scope of the present application.

Claims

1. An open-type headphone, characterized in that: include: The sound-generating part includes an ear shell and a sound-generating unit, wherein the sound-generating unit is arranged in the ear shell and divides the internal space of the ear shell into a front cavity and a rear cavity, and the ear shell is provided with a sound outlet hole communicating with the front cavity; and A fixed structure is connected to the auricle and is provided with a connecting channel and a resonance cavity, one end of the connecting channel is connected to the back cavity, and the other end is connected to the resonance cavity; the cross-section of the connecting channel is smaller than the cross-section of the back cavity, and the cross-section of the connecting channel is smaller than the cross-section of the resonance cavity.

2. The open earphone according to claim 1, characterized in that The connection channel comprises: a channel section connecting the rear cavity and the resonance cavity; and At least one chamber is arranged on the channel section and communicated with the channel section, and the cross section of the chamber is larger than the cross section of the channel section.

3. The open earphone according to claim 2, characterized in that It also includes a first damping member, which is arranged at the connection point between the chamber and the channel section.

4. The open earphone according to claim 1, characterized in that It also includes tuning cotton, which is arranged in the connecting channel; and / or, The open earphone further includes a first damping member, which is arranged at a connection point between the connecting channel and the rear cavity, and at a connection point between the connecting channel and the resonance cavity.

5. The open earphone according to claim 1, characterized in that The fixing structure is provided with a first air leakage hole which is in communication with the connecting channel.

6. The open earphone according to claim 5, characterized in that The number of the first air leakage holes is at least two, and at least two of the first air leakage holes are arranged at intervals along the extension path of the connecting channel; The open earphone further includes a second damping member, which is arranged at a connection point between the first air leakage hole and the connecting channel.

7. The open earphone according to any one of claims 1 to 6, characterized in that: The ear shell is provided with a mounting cavity and a tuning cavity provided beside the mounting cavity, the sound generating unit is provided in the mounting cavity, and the mounting cavity is divided into a front cavity and a rear cavity; Among them, the sound outlet hole is connected to the front cavity, the connecting channel is connected to the tuning cavity, and an air guide port is also provided in the ear shell, and the air guide port is connected to the rear cavity and the tuning cavity so that the air flowing through the air guide port can be compressed.

8. The open earphone according to claim 7, characterized in that The ear shell includes a shell body and a partition arranged in the shell body, the partition divides the internal space of the shell body into the installation cavity and the tuning cavity; the sound unit is arranged in the installation cavity, and divides the internal space of the installation cavity into a front cavity and a rear cavity; one end of the partition and the shell body define the air guide port, and the air guide port connects the rear cavity and the tuning cavity.

9. The open earphone according to claim 7, characterized in that In the thickness direction of the ear shell, the air guide port has a width d, satisfying the relationship: 0.02mm≤d≤30mm.

10. The open earphone according to any one of claims 1 to 6, characterized in that: The ear shell is provided with a second air leakage hole communicating with the rear cavity; and / or The fixing structure is provided with a third air leakage hole communicated with the resonance cavity.

11. The open earphone according to claim 10, characterized in that The number of the second air leakage holes is at least two, and at least two of the second air leakage holes are arranged at intervals; The open earphone further includes a third damping member, which is arranged at a connection point between the second air leakage hole and the rear cavity.

12. The open earphone according to claim 10, characterized in that The number of the third air leakage holes is at least two, and at least two of the third air leakage holes are arranged at intervals; The open earphone further includes a fourth damping member, which is disposed at a connection point between the third air leakage hole and the resonance cavity.

13. The open earphone according to any one of claims 1 to 6, characterized in that: In the wearing state, the line connecting the center of the sound outlet and the center of the ear canal opening is parallel to the central axis of the sound outlet or is arranged at an angle γ, wherein 0°≤γ<90°; and / or, When worn, the distance between the center of the sound outlet and the center of the ear canal opening is D, satisfying the relationship: 0mm≤D<35mm.

14. The open earphone according to any one of claims 1 to 6, characterized in that: The fixing structure comprises a connecting portion and a fixing portion, the connecting portion is connected to the auricle, and the fixing portion is connected to an end of the connecting portion away from the auricle; The connecting portion is provided with the connecting channel, and the fixing portion is provided with the resonance cavity.

15. The open earphone according to claim 14, characterized in that It also includes a battery and a circuit board, and the fixing part includes: A rear end shell connected to an end of the connecting portion away from the ear shell; and The structural plate is arranged in the rear end shell and divides the inner space of the rear end shell into a containing cavity and the resonance cavity. The battery and the circuit board are arranged in the containing cavity.

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