CN213938285U

CN213938285U - Earphone set

Info

Publication number: CN213938285U
Application number: CN202023345539.0U
Authority: CN
Inventors: 王苗苗; 郭晓冬
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-08-10
Anticipated expiration: 2030-12-31

Abstract

The utility model discloses an earphone, the earphone includes the shell that has accommodating space, locates the sound production monomer and the acoustics pipeline in the shell, the sound production monomer divides the accommodating space into earphone front chamber and earphone back chamber, the acoustics pipeline has the first opening and the second opening that are linked together; the first opening is communicated with a single pressure relief hole of the sounding single body, and the second opening is communicated with the rear cavity of the earphone; or the first opening is communicated with the rear cavity of the earphone, the shell is provided with an earphone pressure relief hole communicated with the rear cavity of the earphone, and the second opening is communicated with the earphone pressure relief hole. The utility model discloses an earphone low frequency acoustic performance is good.

Description

Earphone set

Technical Field

The utility model relates to an electroacoustic conversion technology field, in particular to earphone.

Background

The earphone comprises a magnetic circuit component, a vibration component and a shell, wherein a voice coil is connected with an external power supply through a voice coil lead, the electrified voice coil is stressed to generate vibration in a magnetic field of the magnetic circuit system, and the vibration of the voice coil drives the vibration of a vibrating diaphragm to generate resonance with surrounding air to make sound. When the user wore the earphone, the external auditory canal profile coupling of earphone and people's ear to bring higher sensitivity, nevertheless along with the requirement of earphone market to tone quality more and more high, for improving high frequency tone quality, the speaker is close to the ante-chamber more at earphone casing's position, leads to the sound generating unit appearance to be miniaturized, thereby makes the radiating area of speaker limited, therefore the earphone has appeared the problem that the low frequency energy is not enough.

Therefore, it is desirable to provide a new earphone that solves the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an earphone aims at solving among the current earphone because the speaker product is miniaturized, the not enough technical problem of low frequency energy that leads to.

In order to achieve the above object, the sound generating unit provided by the present invention comprises a housing having an accommodating space, a sound generating unit and an acoustic pipeline, wherein the sound generating unit and the acoustic pipeline are arranged in the housing, the accommodating space is divided into a front cavity of an earphone and a rear cavity of the earphone by the sound generating unit, and the acoustic pipeline has a first opening and a second opening which are communicated with each other;

the first opening is communicated with a single pressure relief hole of the sounding single body, and the second opening is communicated with the rear cavity of the earphone;

or the first opening is communicated with the rear cavity of the earphone, the shell is provided with an earphone pressure relief hole communicated with the rear cavity of the earphone, and the second opening is communicated with the earphone pressure relief hole.

Optionally, the acoustic duct includes a main body portion provided with a first groove and a channel portion connected to the main body portion, the main body portion is disposed on the casing, an opening side of the first groove is opposite to the single pressure relief hole, a side wall of the first groove and the casing enclose the first opening, a channel communicated with the first groove is disposed in the channel portion, and one end of the channel, which is far away from the groove, is the second opening.

Optionally, the housing comprises top and bottom walls arranged oppositely, and side walls connecting the top and bottom walls; the acoustic pipeline comprises a main body part and a bending part, the main body part is arranged on the top wall, the opening side of the first groove is opposite to the single pressure relief hole, the side wall of the first groove and the top wall enclose the first opening, the bending part is arranged on the side wall, a second groove communicated with the first groove is arranged in the bending part, and the second opening is arranged on the bending part and communicated with the second groove and the rear cavity of the earphone.

Optionally, the acoustic duct includes a main body portion provided with an arc-shaped passage and a duct portion having a hollow passage, the opening at one end of the arc-shaped passage is the first opening, the opening at the other end of the arc-shaped passage is communicated with the hollow passage, the opening at one end of the hollow passage is the second opening, and the one end of the duct portion provided with the second opening is abutted to the housing.

Optionally, the sound generating unit comprises a casing with sound outlet holes and two sound generating units arranged in the casing, wherein vibrating diaphragms of the two sound generating units are arranged at intervals, and the sound outlet holes are communicated with the front cavity of the earphone.

Optionally, the casing is provided with two single pressure relief holes, and the two single pressure relief holes are respectively arranged corresponding to the two sound generating units.

Optionally, two one in the sound generating unit is bass sound generating unit, and another is treble sound generating unit, first opening with bass sound generating unit corresponds monomer pressure release hole intercommunication.

Optionally, two one in the sound generating unit is bass sound generating unit, and another is treble sound generating unit, first opening with treble sound generating unit corresponds monomer pressure release hole intercommunication.

Optionally, the sound generating unit further includes a spacer disposed in the housing, the spacer is disposed between the two diaphragms of the sound generating unit, a first front cavity communicated with the sound outlet is formed between the spacer and one of the sound generating unit, a second front cavity is formed between the spacer and the other of the sound generating unit, and the spacer is provided with a vent hole communicated with the first front cavity and the second front cavity.

Optionally, the middle partition forms the sound generating unit of the first front cavity is a high-pitch sound generating unit, the middle partition forms the sound generating unit of the second front cavity is a low-pitch sound generating unit

In the utility model, by arranging the acoustic pipeline, the frequency resonance frequency can be effectively reduced, and the low-frequency band sensitivity of the earphone is greatly improved on the whole; through the arrangement scheme of the two acoustic pipelines, a proper acoustic pipeline arrangement scheme can be selected according to the structure and the size of the rear cavity of the earphone, so that the earphone with more structures is suitable.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of an embodiment of the earphone of the present invention;

fig. 2 is a schematic perspective view of an embodiment of an acoustic duct according to the present invention;

fig. 3 is a schematic cross-sectional view of another embodiment of the earphone of the present invention;

fig. 4 is a schematic cross-sectional view of another embodiment of the acoustic duct of the present invention;

fig. 5 is a schematic cross-sectional view of another embodiment of the earphone of the present invention;

fig. 6 is a schematic perspective view of another embodiment of the acoustic duct of the present invention;

fig. 7 is a frequency response curve diagram of an embodiment of the sound generating unit of the present invention;

fig. 8 is a frequency response curve diagram of another embodiment of the sound generating unit of the present invention;

fig. 9 is a frequency response curve diagram of another embodiment of the sound generating unit of the present invention;

fig. 10 is a schematic view of the disassembled structure of the sounding unit of the present invention;

fig. 11 is a schematic cross-sectional view of an embodiment of the sound generating unit of the present invention;

fig. 12 is a schematic cross-sectional view of the sound generating unit according to a pair of proportions;

fig. 13 is a schematic cross-sectional view of another comparative example of the sound generating unit of the present invention;

fig. 14 is a graph of the frequency response of the sound generating unit shown in fig. 11, 12 and 13.

Description of the figures for one embodiment:

reference numbers for another embodiment:

21b	main body part	211b	The first groove
				23	A bent part	231	Second groove
11		13

Reference numbers for yet another embodiment:

21c	main body part	212	Arc-shaped channel
				24	Pipe section	241	Hollow channel

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides an earphone 10.

Referring to fig. 1 to 6, the present invention provides an earphone 10, where the earphone 10 includes a housing 101 having an accommodating space, a sounding unit 100 disposed in the housing 101, and an acoustic duct 200, the sounding unit 100 divides the accommodating space into an earphone front cavity 103 and an earphone rear cavity 104, and the acoustic duct 200 has a first opening 201 and a second opening 202 that are communicated with each other; the first opening 201 is communicated with the single body pressure relief hole 14 of the sound generating single body 100, and the second opening 202 is communicated with the earphone rear cavity 104; or the first opening 201 is communicated with the earphone rear cavity 104, the casing 101 is provided with an earphone pressure relief hole 105 communicated with the earphone rear cavity 104, and the second opening 202 is communicated with the earphone pressure relief hole 105.

In particular, the headset 10 may be in particular an in-ear headset or an in-ear headset. Sound production monomer 100 includes casing 1 and locates magnetic circuit and vibration system in the casing 1, vibration membrane among the vibration system divides casing 1 into monomer front chamber and monomer back chamber, has seted up monomer pressure release hole 14 and monomer back chamber intercommunication on casing 1 to when making the vibration membrane vibration, the atmospheric pressure of monomer front chamber and monomer back chamber is balanced. The single pressure relief hole 14 in the prior art is directly communicated with the rear cavity 104 of the earphone, and in the embodiment shown in fig. 1 to 4, the single pressure relief hole 14 is communicated with the rear cavity 104 of the earphone through an acoustic pipe 200. The shell 101 is provided with a sound outlet 102 facing to the eardrum of the user, when the earphone 10 is worn, the sound outlet 102 faces to the eardrum of the user, and the earphone pressure relief hole 105 is communicated with the external environment. In the embodiment shown in fig. 5 and 6, the rear earphone cavity 104 communicates with the earphone pressure relief hole 105 through the acoustic pipe 200, that is, the rear earphone cavity 104 communicates with the external environment through the acoustic pipe 200.

When the acoustic duct 200 is not provided in the earphone, the low frequency resonance formula is:

wherein fb is the low-frequency resonance frequency of the earphone, and fs is the resonance frequency of the sounding monomer 100; c2 is the acoustic volume of the rear cavity 104 of the earpiece. Therefore, the earphone without the acoustic duct 200 can only reduce the resonance frequency fb of the earphone by increasing the volume of the earphone rear cavity 104.

The utility model discloses resonance formula when earphone 10 low frequency with acoustic pipeline 200 is:

1/Ch＝(1/Ca)+(1/C2)

Mh＝Ma+M4

where fb is the low-frequency resonant frequency of the earphone 10, ch is the compliance of the earphone 10, and Mh is the acoustic mass of the earphone 10; ch is determined by the compliance Ca of the sounding unit 100 and the compliance of the rear cavity 104C2 of the earphone, and they are in series relation, Mh is determined by the mass Ma of the sounding unit 100 and the mass M4 of the acoustic duct 200, and they are also in series relation. The larger the acoustic mass M4 of the acoustic duct 200, the larger Mh and the lower fb.

The lower the low frequency resonance frequency fb of the earphone, the better the low frequency performance. When the sound generating unit 100 is determined, the compliance Ca and the mass Ma of the sound generating unit 100 are not changed, the resonant frequency f0 of the sound generating unit 100 is not changed, the acoustic pipeline 200 is equivalent to a series connection of a mass on the mass of the sound generating unit 100, at this time, the impedance curve of the earphone 10 is changed into a high-order, and a resonant peak appears at a low frequency, so that the purpose of reducing the low-frequency resonant frequency of the earphone 10 is achieved.

Referring to fig. 7, a light color curve is a frequency response curve of the earphone 10 shown in fig. 1, a dark color curve is a frequency response curve of a comparative earphone, and the comparative earphone is different from the earphone 10 shown in fig. 1 in that an acoustic duct 200 is not provided, as can be seen from fig. 7, the earphone 10 provided by the present invention has better acoustic performance at a low frequency portion. Referring to fig. 8, a light color curve is a frequency response curve of the earphone 10 shown in fig. 3, a dark color curve is a frequency response curve of a comparative earphone, and the comparative earphone is different from the earphone 10 shown in fig. 3 in that an acoustic duct 200 is not provided, as can be seen from fig. 8, the earphone 10 provided by the present invention has better acoustic performance at a low frequency portion. Referring to fig. 9, a light color curve is a frequency response curve of the earphone 10 shown in fig. 5, a dark color curve is a frequency response curve of a comparative earphone, and the comparative earphone is different from the earphone 10 shown in fig. 5 in that an acoustic duct 200 is not provided, as can be seen from fig. 9, the earphone 10 provided by the present invention has better acoustic performance at a low frequency portion.

The earphone 10 provided by the utility model can effectively reduce the frequency resonance frequency by arranging the acoustic pipeline 200, and greatly improve the sensitivity of the earphone 10 in the low frequency band on the whole; through two arrangement schemes of the acoustic pipeline 200, the appropriate arrangement scheme of the acoustic pipeline 200 can be selected according to the structure and the size of the rear cavity 104 of the earphone, so that the earphone 10 with more structures can be suitable.

Referring to fig. 1 and 2, the acoustic duct 200 includes a main body portion 21a having a first groove 211a and a channel portion 22 connected to the main body portion 21a, the main body portion 21a is disposed on the housing 1, an opening side of the first groove 211a is disposed opposite to the single pressure relief hole 14, a side wall surface of the first groove 211a and the housing 1 enclose the first opening 201, a channel communicating with the first groove 211a is disposed in the channel portion 22, and one end of the channel away from the first groove 211a is the second opening 202. The main body 21a may be directly attached to the housing 1, and the first recess 211a and the housing 1 enclose a closed duct.

Referring to fig. 3 and 4, the housing 1 includes a top wall 11 and a bottom wall 13 disposed opposite to each other, and a side wall 15 connecting the top wall 11 and the bottom wall 13; the acoustic duct 200 includes a main body portion 21b provided with a first groove 211b and a bending portion 23 connected to the main body portion 21b, the main body portion 21b is disposed on the top wall 11, an opening side of the first groove 211 is opposite to the single pressure relief hole 14, a side wall surface of the first groove 211b and the top wall 11 enclose the first opening 201, the bending portion 23 is disposed on the side wall 15, a second groove 231 communicated with the first groove 211b is disposed in the bending portion 23, and the second opening 202 is disposed on the bending portion 23 and communicated with the second groove 231 and the rear cavity 104 of the earphone. The main body 21b and the bending portion 23 may be directly attached to the housing 1, and the first recess 211b and the second recess 231 and the housing 1 enclose a closed duct, respectively. The difference from the embodiment shown in fig. 1 and 2 is that the main body portion 21a and the channel portion 22 may be in the same plane in the embodiment shown in fig. 1 and 2, whereas the main body portion 21b and the bent portion 23 are not in the same plane in the embodiment shown in fig. 3 and 4. Those skilled in the art can determine the structure of the acoustic duct 200 according to the size and structure of the back cavity 104 of the earphone.

Referring to fig. 5 and 6, the acoustic duct 200 includes a main body portion 21c having an arc-shaped channel 212 and a duct portion 24 having a hollow channel 241, an opening at one end of the arc-shaped channel 212 is the first opening 201, an opening at the other end of the arc-shaped channel 212 is communicated with the hollow channel 241, an opening at one end of the hollow channel 241 is the second opening 202, and an end of the duct portion 24 having the second opening 202 abuts against the housing 101. In the present embodiment, the duct portion 24 is a hollow cylindrical shape, and the inner diameter of the duct portion 24 is larger than the diameter of the earphone pressure release hole 105. The body portion 21c is disposed opposite to an end of the casing 101 remote from the sound outlet hole 102.

Referring to fig. 1, 10 and 11, the sound generating unit 100 includes a housing 1 having a sound outlet 12, and two sound generating units 5 disposed in the housing 1, wherein the diaphragms 51 of the two sound generating units 5 are disposed at opposite intervals, and the sound outlet 12 is communicated with the front cavity 103 of the earphone. Compare in the speaker that only has a sound generating unit 5, the utility model provides a sound generating unit 100 acoustic performance is better.

Two monomer pressure relief holes 14 are formed in the shell 1, and the two monomer pressure relief holes 14 are respectively arranged corresponding to the two sound generating units 5 to balance air pressure in the two sound generating units 5 respectively and maintain normal vibration of the vibrating diaphragm.

In an embodiment, one of the two sound units 5 is a bass sound unit 5, the other is a treble sound unit 5, and the first opening 201 is communicated with the single pressure relief hole 14 corresponding to the bass sound unit 5.

In another embodiment, one of the two sound units 5 is a bass sound unit 5, the other is a treble sound unit 5, and the first opening 201 is communicated with the single pressure relief hole 14 corresponding to the treble sound unit 5. Adopt bass

sound production unit

5 and 5 combinations of high pitch sound production unit, can realize full frequency effect, increase user's listening sense and experience, technical personnel in the art can select acoustic pipeline 200 and bass sound production unit 5 or high pitch sound production unit 5 intercommunication as required.

The casing 1 comprises a middle partition 3, the middle partition 3 is arranged between the vibrating diaphragms of two sound generating units 5, a first front cavity 52 communicated with the sound generating hole 12 is formed between the middle partition 3 and one sound generating unit 5, a second front cavity 54 is formed between the middle partition 3 and the other sound generating unit 5, and the middle partition 3 is provided with a vent hole 32 communicated with the first front cavity 52 and the second front cavity 54. In one embodiment, the housing 1 further comprises an upper shell and a lower shell, to which the septum 3 is attached, respectively.

The partition member 3 includes a partition plate 33 and a hollow outer frame 31 which are provided at intervals to face the sound emitting unit 5, respectively, and an outer peripheral side of the outer frame 31 is connected to the casing 1 and an outer peripheral side of the partition plate 33 is connected to the outer frame 31. The partition 33 divides the gap between the two sound generating units 5 into a first front cavity 52 and a second front cavity 54, and when the sound generating unit 5 forming the first front cavity 52 vibrates to generate sound, the airflow directly passes through the sound outlet hole 12 to reach the outside, so that the outside receives the sound generated by the sound generating unit 5 forming the first front cavity 52; when the sound generating unit 5 forming the second front cavity 54 vibrates to generate sound, the airflow firstly enters the first front cavity 52 through the vent hole 32 and then reaches the outside through the sound outlet hole 12, so that the outside receives the sound generated by the sound generating unit 5 forming the second front cavity 54, for the sound generating unit 5 forming the first front cavity 52 with the middle partition 3, when the sound generating unit 5 works, the vent hole 32 on the middle partition 3 and the second front cavity 54 jointly generate a helmholtz resonance effect, the bandwidth of the sound generating unit 5 can be expanded, and the frequency dividing point of the sound generating unit 5 moves to a high frequency; for the sound unit 5 forming the second front cavity 54 with the spacer 3, when the sound unit 5 works, the part of the first front cavity 52 far away from the sound outlet hole 102 generates the helmholtz resonance effect, so that the bandwidth of the sound unit 5 itself can be expanded, and the frequency dividing point of the sound unit 5 is moved to a high frequency, therefore, the design can improve the high frequency performance and the ductility of the whole sound unit 100.

Referring to fig. 10 to 14, the comparison example shown in fig. 12 is different from the sound generating device of the present invention in that the septum 3 does not have the vent 32 and the two sound generating units 5 have independent front cavities in the comparison example shown in fig. 12; the comparison example shown in fig. 13 is different from the sound generating device of the present invention in that the spacer 3 is not provided in the comparison example shown in fig. 13, and two sound generating units 5 share one front chamber. Referring to fig. 14, a curve L1 is a frequency response curve of the sounding device of the comparative example shown in fig. 12, a curve L2 is a frequency response curve of the sounding device of the comparative example shown in fig. 13, and a curve L3 is a frequency response curve of the sounding device shown in fig. 11. It can be seen from the curves L1, L2, and L3 that the sound generating device of the present invention has a larger bandwidth in the high frequency range.

The first front cavity 52 and the second front cavity 54 are formed by arranging the partition 3 and the two sound generating units 5 respectively, so that the vibration of the diaphragms, which are influenced by the air flows generated by the diaphragms of the two sound generating units 5, is reduced; through seting up air vent 32 on well septum 3 to through producing helmholtz resonance effect, further expand sound production monomer 100 frequency width on the frequency width basis of each sound production unit 5 independent work, the frequency dividing point can move to the high frequency simultaneously, promotes the performance and the ductility of sound production monomer 100 high frequency.

Further, the sound generating unit 5 forming the first front chamber 52 with the septum 3 is a high pitch sound generating unit 5, and the sound generating unit 5 forming the second front chamber 54 with the septum 3 is a low pitch sound generating unit 5. The amplitude of the bass sound unit 5 is larger than that of the treble sound unit 5, and the air thrust in the second front chamber 54 is larger when vibrating, thereby facilitating the air flow to flow out of the sound outlet hole 12.

The vibration direction of the diaphragm of the sound generating unit 5 is perpendicular to the sound emitting direction of the sound emitting hole 12, and the vent hole 32 is opened at one end of the partition plate 33 near the sound emitting hole 12. So that the airflow of the second front chamber 54 can be rapidly propagated through the sound outlet hole 12.

Further, the earphone 10 includes a housing 101 adapted to the cavum concha of the user, and the two sound emitting units 5 may be stacked along a direction perpendicular to the bottom of the housing 101 to the top of the housing 101, with one end of the earphone 10 contacting the top of the cavum concha of the user as the top of the housing 101, and one end contacting the bottom of the cavum concha of the user as the bottom of the housing 101. The two sound emitting units 5 may also be stacked in a direction from the bottom of the housing 101 to the top of the housing 101. A person skilled in the art can determine how to set the positional relationship of the two sound emitting units 5 in the housing 101 according to the space reserved for the sound emitting unit 100 in the housing 101 and the size of the sound emitting unit 100.

The above is only the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the patent protection scope of the present invention.

Claims

1. The earphone is characterized by comprising a shell with a containing space, a sound production unit and an acoustic pipeline, wherein the sound production unit and the acoustic pipeline are arranged in the shell, the containing space is divided into an earphone front cavity and an earphone rear cavity by the sound production unit, and the acoustic pipeline is provided with a first opening and a second opening which are communicated;

2. The earphone according to claim 1, wherein the acoustic duct includes a main body portion provided with an arc-shaped passage and a duct portion having a hollow passage, the opening at one end of the arc-shaped passage is the first opening, the opening at the other end of the arc-shaped passage is communicated with the hollow passage, the opening at one end of the hollow passage is the second opening, and the end of the duct portion provided with the second opening abuts against the housing.

3. The earphone according to claim 1, wherein the sound generating unit comprises a housing having a sound outlet, and two sound generating units disposed in the housing, wherein the diaphragms of the two sound generating units are disposed at an interval, and the sound outlet is communicated with the front cavity of the earphone.

4. The earphone according to claim 3, wherein the acoustic duct includes a main body portion provided with a first groove and a channel portion connected to the main body portion, the main body portion is disposed on the casing, an opening side of the first groove is disposed opposite to the single pressure release hole, a side wall surface of the first groove and the casing enclose the first opening, a channel communicating with the first groove is disposed in the channel portion, and one end of the channel away from the first groove is the second opening.

5. The headset of claim 3, wherein the housing includes oppositely disposed top and bottom walls and side walls connecting the top and bottom walls; the acoustic pipeline comprises a main body part and a bending part, the main body part is arranged on the top wall, the opening side of the first groove is opposite to the single pressure relief hole, the side wall surface of the first groove and the top wall enclose the first opening, the bending part is arranged on the side wall, a second groove communicated with the first groove is arranged in the bending part, and the second opening is arranged on the bending part and communicated with the second groove and the rear cavity of the earphone.

6. The earphone according to claim 3, wherein the casing is provided with two single pressure relief holes, and the two single pressure relief holes are respectively arranged corresponding to the two sound generating units.

7. The earphone as claimed in claim 6, wherein one of the two sound units is a bass sound unit, the other is a treble sound unit, and the first opening is communicated with the single pressure relief hole corresponding to the bass sound unit.

8. The earphone as claimed in claim 6, wherein one of the two sound units is a bass sound unit, the other is a treble sound unit, and the first opening is communicated with the single pressure relief hole corresponding to the treble sound unit.

9. The earphone according to any one of claims 7 or 8, wherein the sound generating unit further comprises a spacer disposed in the housing, the spacer is disposed between the diaphragms of the two sound generating units, a first front chamber communicating with the sound outlet hole is formed between the spacer and one of the sound generating units, a second front chamber is formed between the spacer and the other of the sound generating units, and a vent hole communicating the first front chamber and the second front chamber is opened in the spacer.

10. The headphone of claim 9 wherein the sound generating unit that forms the first front cavity with the septum is a treble sound generating unit and the sound generating unit that forms the second front cavity with the septum is a bass sound generating unit.