Open ear headphone

Abstract

To improve low-frequency sound performance of an open-ear headphone.SOLUTION: An open-ear headphone includes a housing and a sound generation unit 30, the housing having a mounting cavity 10a, a tuning cavity 10b, a sound outlet hole 101, and a vent hole 103. The sound generation unit 30 partitions the mounting cavity 10a into a front cavity 10c and a rear cavity 10d. The sound outlet hole 101 communicates with the front cavity 10c, and the vent hole 103 communicates with the tuning cavity 10b. An air guiding gap 10e further provided in the housing connects the rear cavity 10d and the tuning cavity 10b. A flow area formed at a connection part where the rear cavity 10d and the air guiding gap 10e are connected and a flow area formed at a connection part where the tuning cavity 10b and the air guiding gap 10e are connected are both larger than a flow area formed at the air guiding gap 10e.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present application relates to the technical field of earphones, and more particularly to open-type earphones. [Background technology]

[0002] Currently, open-type earphone products fit snugly against the outside of the ear canal, and the earphone does not block the ear canal, ensuring that consumers can hear not only the sound coming from the earphone but also external sounds, thereby improving safety and comfort.

[0003] However, due to the open-type near-field listening method, a lot of low-frequency sound is lost, and in related art, the internal resonance range of open-type earphones is insufficient, making it difficult to achieve ideal sound quality. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present application provide an open-back earphone that can improve the low-frequency representation of the earphone. [Means for solving the problem]

[0005] The open-type earphone according to the embodiment of the present application comprises: a housing having a mounting cavity and a tuning cavity provided on a side of the mounting cavity, the housing having a sound emission hole and an air escape hole; a sound generating unit disposed within the mounting cavity and dividing the mounting cavity into a front cavity and a rear cavity; The sound emission hole communicates with the front cavity, the air escape hole communicates with the tuning cavity, and an air conduction gap is further provided within the housing, the air conduction gap connects the rear cavity and the tuning cavity, and the flow area formed by the connection between the rear cavity and the air conduction gap and the flow area formed by the connection between the tuning cavity and the air conduction gap are both larger than the flow area formed by the air conduction gap.

[0006] Based on the above embodiments, the technical means of the present application provides an open-type earphone housing with a mounting cavity and a tuning cavity, the housing having a sound output hole and an air release hole, the sound generating unit dividing the mounting cavity into a front cavity and a rear cavity, the sound output hole communicating with the front cavity and the air release hole communicating with the tuning cavity. The tuning cavity and the rear cavity communicate with each other via an air conducting gap, and the flow area formed by the connection between the rear cavity and the air conducting gap and the flow area formed by the connection between the tuning cavity and the air conducting gap are both larger than the flow area formed by the air conducting gap, so that the air flowing through the air conducting gap is compressed. When the sound generating unit vibrates to generate sound, it pushes the air in the rear cavity to vibrate, and because the air escape hole is connected to the tuning cavity, the air can flow along the path of the rear cavity-air conduction gap-tuning cavity, thereby vibrating all the air in the rear cavity and the tuning cavity and increasing the vibrating mass. In addition, the air is compressed when flowing through the air conduction gap, thus increasing the air damping when the sound generating unit vibrates, increasing the equivalent air load, and lowering the resonance frequency, thereby increasing the low-frequency sound pressure level of the earphone and improving the low-frequency representation of the open-type earphone.

[0007] In order to more clearly explain the technical means in the embodiments of the present application or the prior art, the drawings necessary for the description of the embodiments or the prior art will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings based on the structures shown in these drawings without any creative work. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram illustrating the configuration of an open-type earphone according to an embodiment of the present invention. [Figure 2] FIG. 1 is a schematic cross-sectional view of another embodiment of the open-type earphone of the present application. [Figure 3] FIG. 1 is a schematic cross-sectional view of yet another embodiment of the open-type earphone of the present application. [Figure 4] FIG. 1 is a schematic cross-sectional view of yet another embodiment of the open-type earphone of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0009] The achievement of the object, functional features and advantages of the present invention will be further explained in combination with examples with reference to the drawings.

[0010] In order to make the objectives, technical means and advantages of the present application clearer, the embodiments of the present application will be described in more detail below with reference to the drawings.

[0011] In the following description, when referring to the drawings, the same numbers in different drawings refer to the same or similar elements unless otherwise stated. The embodiments described in the following illustrative examples are not representative of all embodiments consistent with the present application. On the contrary, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0012] It should be understood that in the description of this application, terms such as "first," "second," etc. are for descriptive purposes only and should not be understood as indicating or suggesting relative importance. Those skilled in the art can understand the specific meaning of the above terms in the description of this application according to the specific circumstances. In addition, in the description of this application, unless otherwise specified, "plurality" means two or more. "And / or" describes a relationship between related objects and indicates that three types of relationships can exist, for example, A and / or B indicates three cases: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the related objects before and after it are in an "or" relationship.

[0013] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms used herein are for the purpose of describing specific examples only and are not intended to limit the scope of this application. As used herein, the term "and / or" includes any and all combinations of one or more associated items.

[0014] Currently, open-type earphone products fit snugly against the outside of the ear canal, and the earphone does not block the ear canal, ensuring that consumers can hear not only the sound coming from the earphone but also external sounds, thereby improving safety and comfort. However, due to the open-type and near-field listening method, a large amount of low-frequency sound is lost, and ideal sound quality cannot be achieved.

[0015] In order to improve the low frequency sound representation of the earphone and achieve a better listening experience, the embodiment of the present application provides an open-type earphone 100. As can be understood, the open-type earphone 100 should at least have a wearing state, which is a state in which the open-type earphone 100 is fitted with the ear part of the user and fixed relatively to the ear part, and in this state, the user can achieve an ideal listening experience.

[0016] As shown in FIG. 1, the open-type earphone 100 may include a rear end 100c, an ear hook 100b, and a front end 100a. The front end 100a fits snugly against the ear and generates sound. The ear hook 100b connects the front end 100a and the rear end 100c and is hooked between the upper side of the ear and the user's head when worn. The rear end 100c is located at one end of the ear hook 100b, away from the front end 100a, and fits snugly between the rear side of the ear and the user's head when worn. The ear hook 100b is curved in an arc, and the ear hook 100b and the rear end 100c contact at least the front and rear sides of the ear to clamp and secure the ear, allowing the front end 100a connected to one end of the ear hook 100b to be stably positioned in front of the ear. As can be seen, the ear hook portion 100b and the rear end portion 100c have a certain degree of elasticity, allowing the user to bend the ear hook portion 100b and / or the rear end portion 100c to fit the fastening structure and the ear portion. For example, the ear hook portion 100b is made of titanium wire, conductive wire, and soft silicone rubber, and the rear end portion 100c is for arranging components such as a battery and a circuit board. When the open-type earphone 100 is worn on the ear, the front end portion 100a covers the ear canal opening of the ear and is inserted into the ear canal opening. As can be seen, the term "cover" refers to a cover in a broad sense, and the position of the front end portion 100a roughly corresponds to the position of the ear canal opening of the ear, but is not inserted into the ear canal opening of the ear.

[0017] Preferably, the front end 100a, the ear hook portion 100b and the rear end 100c may be three parts that are removably connected, or may be connected to the housing 10 as an integrated unit and molded together during processing.

[0018] As shown in FIG. 2, the front end 100a of the open-type earphone 100 in this embodiment includes a housing 10 and a sound generating unit 30, and the sound generating unit 30 is disposed within the housing 10.

[0019] In the present embodiment, the sound generating unit 30 includes, but is not limited to, an electro-acoustic transducer such as a dynamic speaker, a balanced armature speaker, a Micro-Electro-Mechanical System (MEMS) speaker, a vibrator, or a flat panel speaker.

[0020] The interior space of the housing 10 includes a mounting cavity 10a, an air conduction gap 10e, and a tuning cavity 10b. The tuning cavity 10b is located to the side of the mounting cavity 10a and communicates with the mounting cavity 10a via the air conduction gap 10e. The sound generating unit 30 is located within the mounting cavity 10a and divides the mounting cavity 10a into a front cavity 10c and a rear cavity 10d. The housing 10 further includes a sound emitting section and an air release section. When worn, the sound emitting section is located on the side of the housing 10 facing the user's ears, and the air release section is located to the side of the sound emitting section, on the side of the housing 10 away from the user's ears, or on the periphery of the housing 10. Specifically, the sound emitting section includes a sound emitting hole 101 that communicates with the front cavity 10c, thereby transmitting sound waves. The air release section is provided with air release holes 103 that communicate with tuning cavity 10b, allowing gas in rear cavity 10d to enter tuning cavity 10b and be discharged to the outside through air release holes 103, preventing pressure buildup within housing 10. The shapes of air release holes 103 and sound emission holes 101 may be circular, rectangular, or elongated, and the embodiments of the present application are not specifically limited thereto.

[0021] As can be seen, the gas storage space in the air conduction gap 10e is smaller than the gas storage space in either the rear cavity 10d or the tuning cavity 10b, and the flow area formed by the connection A between the rear cavity 10d and the air conduction gap 10e and the flow area formed by the connection B between the tuning cavity 10b and the air conduction gap 10e are both larger than the flow area formed by the air conduction gap 10e.

[0022] The flow area refers to the cross-sectional area through which gas can flow in a plane perpendicular to the gas flow direction. In the structural configuration shown in FIG. 2, gas flows along the path of rear cavity 10d—air conduction gap 10e—tuning cavity 10b, and the plane perpendicular to the gas flow direction is a plane parallel to the thickness direction of housing 10. In the plane parallel to the thickness direction of housing 10, the width of air conduction gap 10e is smaller than the width of either rear cavity 10d or tuning cavity 10b. When the spatial distribution in other dimensional directions of housing 10 is uniform, the gas flow area in air conduction gap 10e is smallest, and the gas storage space in air conduction gap 10e is smaller than the gas storage space in either rear cavity 10d or tuning cavity 10b, so that the air is compressed when flowing through air conduction gap 10e.

[0023] When the sound generating unit 30 vibrates to generate sound, it pushes the air in the rear cavity 10d to vibrate, and because the air escape hole 103 is connected to the tuning cavity 10b and the distance to the sound generating unit 30 is large, the air flows through the air conduction gap 10e and the tuning cavity 10b, increasing the volume of air involved in the vibration, i.e., increasing the mass of the air.

[0024] According to the following formula:

number

[0025] Furthermore, the air gap 10e can be regarded as a conduit connecting the mounting cavity 10a and the tuning cavity 10b. The flow area formed by the connection A between the rear cavity 10d and the air gap 10e and the flow area formed by the connection B between the tuning cavity 10b and the air gap 10e are both larger than the flow area formed by the air gap 10e, so that the air can be compressed as it flows through the air gap 10e. Due to the end effect of the conduit, the air on both sides of the air gap 10e is subjected to further interference and pressure gradients, which increases the equivalent conduit length, thereby increasing the interference and vibration of the air in the mounting cavity 10a and the tuning cavity 10b and expanding the range of influence, so that the sound-generating unit 30 can push and vibrate all of the air in the mounting cavity 10a and the tuning cavity 10b. The equivalent air load is the mass of air or air resistance driven when the diaphragm of the sound generating unit 30 vibrates, and reflects the interaction between the sound generating unit 30 and the surrounding air. The greater the air resistance, the greater the equivalent air load. In this application, air can flow along the path of rear cavity 10d-air conduction gap 10e-tuning cavity 10b, and is compressed when flowing through air conduction gap 10e. This increases the air damping during vibration, further increasing the equivalent air load of the sound generating unit 30 and lowering the resonant frequency f0, thereby improving low-frequency performance.

[0026] As shown in FIG. 2 , in one embodiment, in the thickness direction of the housing 10, the air gap 10e has a width d1, and the mounting cavity 10a has a width d2, where d1 and d2 satisfy the relationship d2≧1.2d1. In the structure where the width of the mounting cavity 10a varies, the width d2 is set to the minimum value of the width of the mounting cavity 10a to ensure that the widths of the mounting cavity 10a and the air gap 10e satisfy the above relationship. It can be seen that if d2<1.2d1, that is, if the width of the air gap 10e has little or no variation with respect to the width of the mounting cavity 10a, for example, d1=d2, the air is not compressed when flowing through the air gap 10e. Therefore, when the sound-generating unit 30 vibrates to generate sound, the air in the mounting cavity 10a and the tuning cavity 10b is not fully driven. This results in no significant increase in the vibration mass and no significant improvement in the low-frequency performance. Therefore, in order to sufficiently increase the air load, increase the oscillating mass, and lower the resonant frequency to obtain better bass expression, in the embodiment of the present application, d2 is limited to 1.2d1 or more. Preferably, d2 may be 1.5d1, 1.6d1, 2d1, 3d1, etc.

[0027] Furthermore, in the thickness direction of the housing 10, the tuning cavity 10b has a width d3, and d1 and d3 satisfy the relationship d3≧1.2d1. In the structure where the width of the tuning cavity 10b varies, the width d3 is set to the minimum value of the width of the tuning cavity 10b to ensure that the widths of the tuning cavity 10b and the air gap 10e satisfy the above relationship. It can be seen that if d3<1.2d1, that is, the width of the air gap 10e varies little or nothing with respect to the width of the tuning cavity 10b, e.g., d1=d3, then the air is not compressed when flowing through the air gap 10e. Therefore, when the sound-generating unit 30 vibrates to generate sound, the air in the mounting cavity 10a and the tuning cavity 10b is not fully driven. This results in no significant increase in the vibration mass and no significant improvement in the low-frequency performance. Therefore, in order to increase the vibration mass and lower the resonant frequency to obtain better bass reproduction, in the embodiment of the present application, d3 is limited to 1.2d1 or more. Preferably, d3 may be 1.5d1, 1.6d1, 2d1, 3d1, etc.

[0028] As can be seen, the width d2 of the mounting cavity 10a and the width d3 of the tuning cavity 10b may be the same or different. Since the widths d2 and d3 are both greater than the width d1, the mounting cavity 10a-air conduction gap 10e-tuning cavity 10b form a cavity structure shaped like an hourglass, and the air conduction gap 10e is a narrow passage connecting the two cavities. When the gas flows through the air conduction gap 10e, it is compressed, thereby completely driving the air in the mounting cavity 10a and the tuning cavity 10b, increasing the air load, lowering the resonant frequency, and further improving the low-frequency sound expression.

[0029] As shown in FIGS. 2 to 4, the housing 10 includes a housing main body and a partition plate 15 disposed within the housing main body. A space is formed within the housing main body to accommodate and protect components such as the sound generating unit 30. The sound output holes 101 of the sound output section and the air release holes 103 of the air release section are disposed in the housing main body. The partition plate 15 divides the interior space of the housing main body into a mounting cavity 10a and a tuning cavity 10b. The sound generating unit 30 is disposed within the mounting cavity 10a. Preferably, the sound generating unit 30 may be connected to the partition plate 15, i.e., the partition plate 15 serves as a connecting member for the sound generating unit 30, making the structure more compact. One end of the partition plate 15, together with the housing main body, defines an air conduction gap 10e, thereby connecting the rear cavity 10d and the tuning cavity 10b.

[0030] 2 , in one specific embodiment, for ease of production, manufacturing, and assembly, the housing main body includes a front housing 11 and a rear housing 13. The front housing 11 is connected to the rear housing 13 and defines an internal space of the housing main body together with the rear housing 13. One end of the partition plate 15 is connected to the front housing 11, and the other end thereof defines an air guide gap 10e together with a portion of the inner wall of the rear housing 13. The sound emission hole 101 may be provided in the front housing 11, and the air escape hole 103 may be provided in at least one of the front housing 11 and the rear housing 13. For example, as shown in FIG. 2 , the air escape hole 103 is surrounded by the front housing 11 and the rear housing 13. Of course, in other embodiments, the air escape hole 103 may also be provided in the front housing 11 or the rear housing 13. Alternatively, if there are multiple air escape holes 103, both the front housing 11 and the rear housing 13 may have multiple air escape holes 103.

[0031] In this embodiment, the sound generating unit 30 is a dynamic speaker and includes a frame 31, a magnetic body 33, and a vibrating assembly 35. The vibrating assembly 35 includes a vibrating membrane 353 and a voice coil 351. The frame 31 has an accommodating cavity and an opening communicating with the accommodating cavity. The magnetic body 33 is disposed within the accommodating cavity and defines a magnetic gap together with the inner wall of the accommodating cavity. The vibrating membrane 353 covers the opening and is connected to the frame 31. The voice coil 351 is located within the accommodating cavity, inserted into the magnetic gap, and connected to the vibrating membrane 353. When a sound current passes through the voice coil 351, a magnetic field that changes with the sound current is generated. This magnetic field interacts with the magnetic field of the magnetic body 33 to vibrate the voice coil 351, causing the vibrating membrane 353 to vibrate and generate sound.

[0032] As can be understood, a portion of the partition plate 15 is inserted into the rear cavity 10d, and the frame 31 may be connected to the partition plate 15, with one end of the partition plate 15 remote from the front housing 11 being spaced apart from an inner wall of a portion of the rear housing 13 to define the air conduction gap 10e. Specifically, the diaphragm 353, at least a portion of the front housing 11, and the partition plate 15 together define the front cavity 10c, and at least a portion of the front housing 11 includes a portion of the front housing 11 facing the diaphragm 353, and this portion of the front housing 11 is provided with the sound emission hole 101. The frame 31, at least a portion of the rear housing 13, and the partition plate 15 define the rear cavity 10d, and at least a portion of the rear housing 13 includes a portion of the rear housing 13 facing the frame 31 of the rear housing 13. Divider plate 15, front housing 11 and rear housing 13 together further define a tuning cavity 10b located on the side of divider plate 15 remote from rear cavity 10d.

[0033] One side edge of the partition plate 15 remote from the front housing 11 is connected to the side wall of the rear housing 13, and the end face of this one end is spaced from the inner bottom wall of the rear housing 13 to define the air conducting gap 10e. Alternatively, the end face of the partition plate 15 remote from the front housing 11 and some of its side edges may both be spaced from part of the inner wall of the rear housing to define the air conducting gap 10e. As can be seen, the air flow area of ​​the air conducting gap 10e formed in either of the above two ways is smaller than the air flow area at the junction between the rear cavity 10d and the air conducting gap 10e and the air flow area at the junction between the tuning cavity 10b and the air conducting gap 10e, thereby increasing the equivalent air mass involved in vibration and improving bass reproduction.

[0034] In this way, partition plate 15 may serve as a mounting base for at least a portion of sound generating unit 30, whereby partition plate 15 divides the housing main body to define tuning cavity 10b, increasing the air volume and the air load during vibration of sound generating unit 30. Partition plate 15 effectively separates rear cavity 10d from tuning cavity 10b, and also easily forms narrow air conduction gap 10e between the end of partition plate 15 and part of the inner wall of rear housing 13, thereby connecting rear cavity 10d and tuning cavity 10b and compressing the air flowing through air conduction gap 10e, driving all of the air in rear cavity 10d and tuning cavity 10b to vibrate, thereby improving bass reproduction.

[0035] The partition plate 15 and the front housing 11 have an integral structure. For example, the partition plate 15 and the front housing 11 are integrally injection molded, which provides high structural integrity, simplifies processing and production, and increases production efficiency. Alternatively, the partition plate 15 and the front housing 11 and the rear housing 13 are molded separately and then connected by adhesive, fastening, or other methods; however, the embodiments of the present application are not limited to this.

[0036] The open-type earphone 100 further includes components such as a circuit board, a battery, an antenna, charging contacts, and magnetic components. As can be understood, it is not desirable for the above components to come into contact with water. However, the internal space of the housing 10 must be connected to the outside through the air escape hole 103, and in some cases, water may inevitably enter. To improve the reliability of the earphone, the above components must be sealed when installed in the housing 10.

[0037] 2 to 4, in one embodiment, the rear housing 13 includes a rear housing main body 131 and a rear housing sealing cover 133. The rear housing main body 131 is connected to the front housing 11, and the rear housing sealing cover 133 is connected to the rear housing main body 131, and together with the rear housing main body 131, defines a first sealed cavity 135 for arranging the member to be sealed 50. As can be understood, the member to be sealed 50 includes members such as the circuit board, battery, antenna, charging contacts, and magnetic member.

[0038] At least a portion of the rear housing sealing cover 133 forms the inner wall surface of the tuning cavity 10b, and the tuning cavity 10b is specifically defined by the partition plate 15 and the rear housing sealing cover 133, or by the partition plate 15, the rear housing sealing cover 133, and a portion of the structure of the front housing 11. In the embodiment shown in FIG. 2, the rear housing sealing cover 133 straddles the rear cavity 10d and the tuning cavity 10b, and the partition plate 15 is spaced apart from the rear housing sealing cover 133 to define the air conduction gap 10e. As described above, the rear housing sealing cover 133 in this embodiment is fitted with the rear housing main body 131 to seal the member to be sealed 50, without being connected to the sound generating unit 30 to seal the sound generating unit 30. In this way, on the one hand, when water enters the open-type earphone 100, it can only enter the internal space of the housing 10 through the air escape holes 103 and the like and break through the sealing of the rear housing sealing cover 133 before it can affect the sealed component 50, which makes the water infiltration path more complex and the sealed component 50 safer, which is beneficial to improving the waterproof level and reliability of the open-type earphone 100; on the other hand, the rear housing sealing cover 133 does not seal the sound-generating unit 30, but intentionally seals the sealed component 50, and all the air in the space other than the first sealed cavity 135 is involved in the vibrations of the sound-generating unit 30 when it generates sound, which improves the space utilization rate, increases the air load, and improves the bass reproduction.

[0039] In addition, in the case of assembly, after the rear housing sealing cover 133, the member to be sealed 50, and the rear housing main body 131 are assembled, they are fitted and connected to the front housing 11 and the sound generating unit 30. In other words, in the production process, for a specific model number of open-type earphone 100, the rear housing sealing cover 133, the rear housing main body 131, and the member to be sealed 50 therein are all involved in the assembly process, which makes it possible to reduce the difficulty of assembly, reduce the number of assembly steps, and improve production efficiency.

[0040] 2 , the front housing 11 includes a front housing main body 111 and a front housing sealing cover 113. The front housing main body 111 is connected to the rear housing main body 131, and the sound emission hole 101 is provided in the front housing main body 111. The front housing sealing cover 113 is connected to the front housing main body 111 and, together with the front housing main body 111, defines a second sealing cavity 115 for arranging the member to be sealed 50. Similarly, the member to be sealed 50 includes components such as the circuit board, battery, antenna, charging contacts, and magnetic members. By providing the front housing sealing cover 113 and the second sealing cavity 115, the member to be sealed 50 can be intentionally sealed sufficiently, further improving the reliability of the open-type earphone 100. The partition plate 15 is connected to the front housing main body 111, and the front housing sealing cover 113 is provided on the opposite side of the partition plate 15 from the sound generating unit 30, so that the front housing sealing cover 113, the rear housing sealing cover 133 and the partition plate 15 can define the tuning cavity 10b.

[0041] As can be understood, front housing sealing cover 113 and rear housing sealing cover 133 may be structural members provided for component 50 to be sealed, or may be the case of several components having a waterproof sealing effect, and the case of the components may be front housing sealing cover 113 or rear housing sealing cover 133 and form at least a portion of the wall surface of tuning cavity 10b. For example, some magnetic components are not affected by water, and if the magnetic components are directly connected to front housing main body 111 or rear housing main body 131, the surface of the magnetic components may be front housing sealing cover 113 or rear housing sealing cover 133.

[0042] Naturally, the method of forming the air gap 10e is not limited to the above embodiment. For example, a partition plate 15 may connect the front housing 11 and the rear housing 13, and a through hole may be provided in the partition plate 15, which may connect the rear cavity 10d and the tuning cavity 10b to form the air gap 10e.

[0043] As shown in FIGS. 2 and 3, in some embodiments of the present application, the tuning cavity 10b is located axially to the side of the mounting cavity 10a surrounding the sound-generating unit 30, which not only makes it easy to provide a sealed cover, but also makes it easy to construct and does not affect the thickness of the front end 100a of the open-type earphone 100.

[0044] Preferably, in some structural configurations, housing 10 is provided with at least two tuning cavities 10b, each located on at least two circumferential sides of mounting cavity 10a. As can be seen, housing 10 is further provided with at least two air conduction gaps 10e and at least two air relief portions, each air conduction gap 10e connecting one tuning cavity 10b with rear cavity 10d, and each air relief portion corresponding to one tuning cavity 10b. Specifically, the housing 10 may include two partition plates 15, spaced apart to divide the interior space of the housing 10 into two tuning cavities 10b and one mounting cavity 10a. Each partition plate 15 is spaced apart from the rear housing 13 to form an air conduction gap 10e, and the sound generating unit 30 is connected to the two partition plates 15. Providing at least two tuning cavities 10b further increases the volume of air involved in vibration, thereby increasing the vibration mass and improving low-frequency sound effects. Furthermore, by arranging the at least two tuning cavities 10b symmetrically with respect to the mounting cavity 10a, the shape of the open-type earphone 100 becomes symmetrical and aesthetically pleasing.

[0045] As can be appreciated, in some other configurations, tuning cavity 10b may be provided surrounding mounting cavity 10a, and partition plate 15 may also be annular, thereby defining an annular air conduction gap 10e together with the housing body. Air conduction gap 10e may be continuous or discontinuous along the circumferential direction of mounting cavity 10a, and the present application is not limited thereto.

[0046] 4, in some embodiments, the gas flow area of ​​tuning cavity 10b decreases along the direction of gas flow from air conduction gap 10e to air escape hole 103. In the embodiment shown in FIG. 4, air escape hole 103 is provided on the periphery of housing 10, air conduction gap 10e and air escape hole 103 face each other in a direction perpendicular to the thickness direction of housing 10, and the direction of gas flow from air conduction gap 10e to air escape hole 103 is perpendicular to the thickness direction of housing 10. In this way, sound waves transmitted toward air escape hole 103 are repeatedly reflected along their path, forming an acoustic black hole. In this process, the wave velocity of the sound waves gradually decreases, thereby reducing sound transmission through air escape hole 103, reducing sound leakage from open-type earphone 100, and improving the user experience.

[0047] 4, the thickness direction of the housing 10 is substantially the same as the axial direction of the sound generating unit 30. In the thickness direction of the housing 10, the tuning cavity 10b has a first wall surface 1131 and a second wall surface 1331 arranged opposite to each other. As can be understood, in combination with the above embodiment, the first wall surface 1131 is at least a portion of the surface of the front housing sealing cover 113, and the second wall surface 1331 is at least a portion of the surface of the rear housing sealing cover 133. The distance between the first wall surface 1131 and the second wall surface 1331 gradually decreases along the direction approaching the air release hole 103. In this way, the sound waves within the tuning cavity 10b are repeatedly reflected by the first wall surface 1131 and the second wall surface 1331 as they approach the air release hole 103, thereby achieving the goal of reducing sound leakage from the air release hole 103.

[0048] Specifically, at least one of the first wall surface 1131 and the second wall surface 1331 is provided at an incline. For example, in the case where the housing 10 is arranged horizontally and the thickness direction of the housing 10 is along the vertical direction, one of the first wall surface 1131 and the second wall surface 1331 is arranged horizontally, and the other is inclined upward or downward toward the air release hole 103 in the direction approaching the air release hole 103. In this way, the distance between the first wall surface 1131 and the second wall surface 1331 gradually decreases in the direction approaching the air release hole 103. Alternatively, as shown in FIG. 4, the first wall surface 1131 and the second wall surface 1331 are both inclined, i.e., the first wall surface 1131 gradually inclines downward and the second wall surface 1331 gradually inclines upward in the direction approaching the air release hole 103, so that the distance between the first wall surface 1131 and the second wall surface 1331 gradually decreases.

[0049] That is, when the open-type earphone 100 is positioned horizontally, at least a portion of the front housing main body 111 and the rear housing main body 131 is also positioned horizontally, and the angle between at least one of the first wall surface 1131 and the second wall surface 1331 and the horizontal direction is an obtuse angle. The angle between the first wall surface 1131 and a portion of the front housing main body 111 is β, and the angle between the second wall surface 1331 and a portion of the rear housing main body 131 is γ, satisfying the relationships 90°<β<180° and 90°<γ<180°. As can be seen, if β or γ is less than 90 degrees, the first wall surface 1131 or the second wall surface 1331 cannot form the inner wall of the tuning cavity 10b, and if β or γ is greater than 90 degrees, it is difficult to achieve a structural configuration in which the distance between the first wall surface 1131 and the second wall surface 1331 gradually decreases. β and γ are preferably 120°, 150°, 160°, etc.

[0050] As shown in Figures 2 to 4, in some embodiments, the air escape portion is located on the periphery of the housing 10, which on the one hand is away from the sound generating unit 30, thereby increasing the air load and improving the bass effect, and on the other hand, facilitates sufficient reflection of sound waves and reduces sound leakage.

[0051] The diameter of the air release hole 103 is r, and in the thickness direction of the housing 10, the relationship d2≧1.2r is satisfied. As can be seen, if d2<1.2r, the air release hole 103 will be too large, which is unfavorable for maintaining the pressure in the rear cavity 10d and the tuning cavity 10b, resulting in a poor sound dissipation effect and more serious sound leakage due to the excessively large dimensions. Therefore, to ensure the sound dissipation effect and reduce sound leakage, this embodiment is limited to d2≧1.2r. Preferably, d2 may be 1.8r, 2r, 3r, etc.

[0052] Furthermore, in the thickness direction of the housing 10, the relationship d3≧1.2r is further satisfied, which similarly further ensures the sound dissipation effect and reduces sound leakage, and d2 may be 1.8r, 2r, 3r, etc., and the explanation will be omitted here.

[0053] 3 and 4, in some embodiments, the sound emitting unit includes at least two sound emitting holes 101, and the central axes of the at least two sound emitting holes 101 may be parallel to each other. For consumers with large ears, the problem of the sound emitting holes 101 moving toward the top of the head relative to the ear canal when worn inevitably occurs, and some of the sound emitting holes 101 may be blocked by the ear, reducing the sound heard by the user and affecting the user experience. In the embodiments of the present application, the orientations of the at least two sound emitting holes 101 are different. In this way, when one sound output hole 101 is blocked by the user's ear, the orientation of at least another sound output hole 101 is different from the orientation of the blocked sound output hole 101, and therefore, due to being not blocked by the user's ear, sound waves can be transmitted from the unblocked sound output hole 101 to the user's ear canal, which ensures the user's listening effect, improves the robustness of the open-type earphone 100, and makes the compatibility of the open-type earphone 100 high, and the volume of sound heard by different consumers as consistent as possible.

[0054] Specifically, as shown in FIG. 4 , in one specific embodiment, at least a portion of the front housing 11 protrudes in a direction away from the sound generating unit 30 to form a sound output boss 117, and at least one sound output hole 101 is provided on the base surface of the sound output boss 117, and at least one sound output hole 101 is provided on a side surface of the sound output boss 117. As can be understood, by providing the sound output boss 117 in a protruding manner, the sound output portion is positioned closer to the user's ear canal, improving the sound pressure level of the sound and facilitating the user's listening. As shown in FIG. 4 , the sound output boss 117 may be a truncated cone-shaped protrusion, and the sound output hole 101 located on the base surface of the sound output boss 117 has a central axis S1, and the sound output hole 101 located on the side surface of the sound output boss 117 has a central axis S2. In the embodiment shown in FIG. 4 , the angle α between the central axis S1 and the central axis S2 is 90 degrees, that is, the sound output hole 101 is oriented at 90 degrees. In this way, even if the sound emitting hole 101 located on the base surface of the sound emitting boss 117 is blocked, it is possible to ensure to the maximum extent that the sound emitting hole 101 located on the side of the sound emitting boss 117 is not blocked, allowing the user to hear the sound clearly.

[0055] Naturally, the sound emitting boss 117 may be shaped like a truncated pyramid or a cylinder, and the angle α between the two sound emitting holes 101 is not limited. Furthermore, the embodiments of the present application do not limit the number of sound emitting holes 101, and the housing 10 may be provided with three or more sound emitting holes 101. Taking three sound emitting holes 101 as an example, one of the sound emitting holes 101 may be located on the base surface of the sound emitting boss 117, and the other two sound emitting holes 101 may be located on the side surfaces of the sound emitting boss 117, and the axes of the two sound emitting holes 101 located on the side surfaces of the sound emitting boss 117 may be parallel or at an angle, and a description thereof will be omitted here.

[0056] Through experiments, the sound gain (dB) is obtained by comparing the audible loudness when a single sound emitting hole 101 or multiple sound emitting holes 101 are provided with parallel central axes (mode 1) with the audible loudness when at least two sound emitting holes 101 are provided with central axes of the at least two sound emitting holes 101 arranged at an angle (mode 2). The greater the sound gain, the louder the sound a user can hear in mode 2 than in mode 1. Through experiments, sound data is collected when the open-type earphone 100 is moved upward by 3 mm, 6 mm, 9 mm, and 12 mm from a starting position where at least two sound emitting holes 101 are completely blocked. [Table 1]

[0057] Obviously, when a situation occurs in which the sound output holes 101 are blocked, the sound that the user can hear in mode 2 is indeed louder, and the more severe the blocking situation of the sound output holes 101, the greater the sound gain in mode 2 will be than in mode 1. Therefore, the embodiment of the present application can reduce sound loss caused by the open-type earphone 100 being worn in an improper position and some of the sound output holes 101 being blocked, and improve robustness.

[0058] It should be understood that the same or similar symbols in the drawings of this embodiment correspond to the same or similar components, and that in the description of this application, the orientations or positional relationships indicated by the terms "upper," "lower," "left," "right," etc. are orientations or positional relationships based on the drawings, are merely for the purpose of explaining and simplifying the description of this application, and do not indicate or suggest that the referred-to devices or elements must have a specific orientation, be configured in a specific orientation, and be operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are merely used for illustrative purposes and should not be understood to limit the present application, and those skilled in the art can understand the specific meanings of the above terms according to specific circumstances.

[0059] The above are only preferred embodiments of the present application, and do not limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included within the protection scope of the present application. [Explanation of symbols]

[0060] 100 open-back earphones 100a front end 100b Ear hook 100c rear end 10. Housing 10a Mounting cavity 10b Tuning Cavity 10c front cavity 10d rear cavity 10e Air conduction gap 101 Sound emission hole 103 Air release hole 11 Front housing 111 Front housing body 113 Front housing sealing cover 1131 First wall 115 Second sealing cavity 117 Sound Emitting Boss 13 Rear housing 131 Rear housing body 133 Rear housing sealing cover 1331 Second wall 135 First sealed cavity 15 Partition 30 sound generating units 31 frames 33 Magnetic material 35 Vibration Assembly 351 voice coil 353 Vibrating Membrane 50 Sealed parts

Claims

1. a housing having a mounting cavity and a tuning cavity provided on a side of the mounting cavity, the housing having a sound emission hole and an air escape hole; a sound generating unit disposed within the mounting cavity and dividing the mounting cavity into a front cavity and a rear cavity; the sound emission hole communicates with the front cavity, the air escape hole communicates with the tuning cavity, an air conduction gap is further provided within the housing, the air conduction gap communicates with the rear cavity and the tuning cavity, and a flow area formed by a connection portion between the rear cavity and the air conduction gap and a flow area formed by a connection portion between the tuning cavity and the air conduction gap are both larger than the flow area formed by the air conduction gap.

2. the housing includes a housing main body and a partition plate provided within the housing main body, the housing main body being provided with the sound emission hole and the air escape hole, the partition plate dividing the internal space of the housing main body into the mounting cavity and the tuning cavity, The open-type earphone according to claim 1 , wherein one end of the partition plate and the housing main body define the air conduction gap.

3. The housing body includes: a front housing provided with the sound emission holes; a rear housing connected to the front housing and defining an internal space of the housing body together with the front housing; The open-type earphone according to claim 2, characterized in that one end of the partition plate is connected to the front housing, and the other end of the partition plate remote from the front housing defines the air conduction gap together with a part of an inner wall of the rear housing, and the air escape hole is provided in at least one of the front housing and the rear housing.

4. The rear housing includes: a rear housing main body connected to the front housing; a rear housing sealing cover connected to the rear housing main body and defining, together with the rear housing main body, a first sealing cavity for disposing a member to be sealed, the tuning cavity being defined by at least the rear housing sealing cover and the partition plate; 4. The open-type earphone according to claim 3, wherein one end of the partition plate away from the front housing defines the air conduction gap together with the rear housing sealing cover or an inner wall of a part of the rear housing main body.

5. The front housing includes: a front housing main body connected to the rear housing main body and having the sound emission holes; a front housing sealing cover connected to the front housing body and defining, together with the front housing body, a second sealing cavity for disposing a member to be sealed; 5. The open-type earphone according to claim 4, wherein the partition plate is connected to the front housing main body, and the tuning cavity is defined by at least the front housing sealing cover, the rear housing sealing cover, and the partition plate.

6. In the thickness direction of the housing, the air gap has a width d1, and the mounting cavity has a width d2, satisfying the relationship d2≧1.2d1; and / or In the thickness direction of the housing, the air gap has a width d1 and the tuning cavity has a width d3, satisfying the relationship d3≧1.2d1; and / or The open-type earphone according to claim 1, wherein the housing is provided with at least two tuning cavities, each of the at least two tuning cavities being located at least on either side of the mounting cavity in a circumferential direction.

7. 2. The open-type earphone according to claim 1, wherein the air flow area of ​​the tuning cavity decreases along the direction in which the air flows from the air conduction gap to the air escape hole.

8. 8. The open-type earphone according to claim 7, wherein the tuning cavity has a first wall surface and a second wall surface that are opposed to each other in a thickness direction of the housing, and the distance between the first wall surface and the second wall surface gradually decreases along a direction approaching the air escape hole.

9. the air escape holes are located on the periphery of the housing; and / or The diameter of the air escape hole is r, and the mounting cavity has a width d2 in the thickness direction of the housing, satisfying the relationship d2≧1.2r; and / or The open-type earphone according to claim 7, characterized in that the diameter of the air escape hole is r, and in the thickness direction of the housing, the tuning cavity has a width d3, satisfying the relationship d3≧1.2r.

10. The open-type earphone according to any one of claims 1 to 9, characterized in that the housing is provided with at least two sound emission holes, and the at least two sound emission holes have at least two different directions.

11. 11. The open-type earphone according to claim 10, wherein at least a portion of the structure of the housing protrudes in a direction away from the sound generating unit to form a sound emitting boss, at least one sound emitting hole is provided in a base surface of the sound emitting boss, and at least one sound emitting hole is provided in a side surface of the sound emitting boss.

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