WO2022166383A1 - Sound producing device and earphone - Google Patents

Abstract

Disclosed are a sound producing device and an earphone. The sound producing device comprises a magnet yoke, a tweeter unit and a woofer unit, wherein the magnet yoke comprises an accommodating portion comprising a side wall and a bottom wall which are connected to each other to form an accommodating space; the tweeter unit comprises a first magnetic portion, a tweeter diaphragm and a tweeter voice coil connected to the tweeter diaphragm, the first magnetic portion is placed in the accommodating space, a tweeter magnetic gap for the tweeter voice coil to insert is formed between the first magnetic portion and the side wall, and the tweeter diaphragm is a planar metal diaphragm; and the woofer unit comprises a second magnetic portion, a woofer diaphragm and a woofer voice coil connected to the woofer diaphragm, a woofer magnetic gap for the woofer voice coil to insert is formed between the second magnetic portion and the side wall, and the woofer unit and the tweeter unit are coaxially arranged. The present invention takes high-frequency and low-frequency performances into consideration, and the tweeter unit is embedded in the woofer unit, directly replacing a central magnetic circuit portion of the woofer unit, such that the occupied space of the sound producing device in the earphone is reduced while magnetic flux is provided.

Description

Sound generators and headphones technical field

The present invention relates to the technical field of electro-acoustic conversion, in particular to a sound-generating device and an earphone.

Background technique

The sound-generating device of conventional earphones generally only contains one vibration unit. This kind of structure design is relatively simple, but it cannot take into account the performance and sound quality of the product in different frequency bands at high frequency and low frequency. The sound quality is poor, and some earphones have low frequency. The performance is better, and some are better at high frequency. The sound-generating device of the dual-vibration unit can satisfy the simultaneous operation of low-frequency and high-frequency, and has a complementary and improved effect on the performance curve of the product and the sound quality of listening. However, the existing dual-vibration unit sound-generating device generally adopts an external stacking type, that is, the tweeter unit and the woofer unit are in the same or opposite direction up and down, occupying a large space, low magnetic circuit utilization, and slightly insufficient bandwidth and sound quality.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a sound-generating device and an earphone, aiming at solving the technical problem that the existing sound-generating device that can satisfy both high frequency and low frequency effects takes up a large space.

In order to achieve the above object, the present invention provides a sounding device, the sounding device includes:

a magnetic yoke, the magnetic yoke includes an accommodating portion, the accommodating portion includes a side wall and a bottom wall, and the side wall and the bottom wall are connected to each other to form an accommodating space;

A tweeter unit, the tweeter unit includes a first magnetic part, a tweeter diaphragm and a tweeter voice coil connected to the tweeter diaphragm, the first magnetic part is placed in the accommodating space, the first magnetic part A high-pitched magnetic gap is formed between the side wall and the high-pitched voice coil for insertion, and the high-pitched diaphragm is a plane metal diaphragm;

A bass unit, the bass unit includes a second magnetic part, a bass diaphragm and a bass voice coil connected to the bass diaphragm, and a bass voice coil is formed between the second magnetic part and the side wall for insertion of the bass voice coil The bass magnetic gap, the woofer and the tweeter are coaxially arranged.

Optionally, the magnetic yoke further includes a connecting portion extending outward from one end of the side wall away from the bottom wall, and the edge of the high-pitched diaphragm is fixed to the connecting portion through a first fixing ring.

Optionally, the magnetic yoke further includes a surrounding portion circumferentially surrounding the outer circumference of the connecting portion, and the second magnetic portion is fixed to a side of the surrounding portion away from the tweeter diaphragm.

Optionally, the first magnetic part includes a first magnetic steel and a first washer fixed to the first magnetic steel, the first magnetic steel is fixed to the bottom wall, and the second magnetic part includes A second magnetic steel and a second washer fixed to the second magnetic steel, the second magnetic steel is fixed to the side of the surrounding portion away from the tweeter diaphragm, the first washer is connected to the The treble magnetic gap is formed between the side walls, and the bass magnetic gap is formed between the second washer and the side wall.

Optionally, the surrounding portion is provided with a sound outlet that communicates with the bass magnetic gap.

Optionally, the tweeter diaphragm is a single-layer metal layer.

Optionally, the tweeter diaphragm includes a metal layer and a damping layer disposed outside the metal layer.

Optionally, the thickness of the tweeter diaphragm is 10-40 μm, and the elastic modulus of the tweeter diaphragm is greater than or equal to 30GPa.

Optionally, the sound generating device further includes a cover body with a ventilation hole, and the bass diaphragm is fixed on the cover body.

Optionally, the cover body includes a bottom cover and a side cover connected to the bottom cover, the bottom cover is spaced apart from the bass diaphragm and is provided with the ventilation hole, and the side cover is formed with a first Step, the bass diaphragm is fixed on the first step by the second fixing ring.

Optionally, the bass unit further includes a passive radiating film located between the bass diaphragm and the bottom cover, the passive radiating film is arranged corresponding to the bass diaphragm, and the edge of the passive radiating film is fixed. on the second step formed by the side cover.

In addition, the present invention also provides an earphone, the earphone includes the above-mentioned sound generating device.

In the technical solution of the present invention, the sound-generating device includes a yoke, a tweeter and a bass unit, the yoke includes a accommodating portion, and the accommodating portion includes a side wall and a bottom wall that are interconnected to form an accommodating space; the tweeter unit includes The first magnetic part, the high-pitched diaphragm and the high-pitched voice coil connected with the high-pitched diaphragm, the first magnetic part is placed in the accommodating space, and a high-pitched magnetic gap is formed between the first magnetic part and the side wall for the high-pitched voice coil to be inserted, The treble diaphragm is a flat metal diaphragm; the bass unit includes a second magnetic part, a bass diaphragm and a bass voice coil connected to the bass diaphragm, and a bass magnetic gap for the bass voice coil to be inserted between the second magnetic part and the side wall is formed , that is, the tweeter and the woofer of the present invention are coaxially arranged, which not only takes into account the performance of high frequency and low frequency, but also the tweeter is embedded in the woofer to directly replace the central magnetic circuit part of the woofer. The height of the sounding device reduces the space occupied by the sounding device in the earphone and improves the efficiency of the magnetic circuit.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.

FIG. 1 is a schematic cross-sectional structure diagram of an embodiment of a sound-emitting device of the present invention;

2 is a schematic structural diagram of an embodiment of a sound-emitting device of the present invention;

3 is an exploded schematic diagram of an embodiment of the sounding device of the present invention;

Fig. 4 is another exploded schematic diagram of an embodiment of the sounding device of the present invention;

Fig. 5 is the schematic diagram of another angle of Fig. 1;

Fig. 6 is the bottom view of Fig. 2;

FIG. 7 is a plan view of FIG. 2 .

Description of the reference numerals of the embodiment:

label	name	label		name
10	sound device	20	yoke
twenty one	accommodating part	211	side wall
212	bottom wall	213	accommodation space
twenty two	connector	twenty three	surround
231	vertical wall	232	horizontal wall
twenty four	extension	30	tweeter
31	first magnet	32	tweeter diaphragm
33	tweeter voice coil	34	first fixing ring
35	first washer	40	woofer
41	second magnet	42	Bass diaphragm
43	Bass voice coil	44	second fixing ring
45	Second Wasser	46	Passive Radiation Film

50	cover	51	bottom cover
511	vent	52	side cover
521	first step	522	second step
231	sound hole	36	Treble Magnetic Gap
47	Bass Magnetic Gap

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and should not be understood as indicating or implying their relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist. , is not within the scope of protection required by the present invention.

The "up" and "down" referred to in the present invention are based on the orientation shown in FIG. 1, and are only used to explain the relative positional relationship between the components under the attitude shown in FIG. 1. If the specific attitude changes , the directional indication changes accordingly.

As shown in FIG. 1 to FIG. 4 , the present invention provides a sounding device 10 , and the sounding device 10 includes:

The magnetic yoke 20, the magnetic yoke 20 includes an accommodating portion 21, and the accommodating portion 21 includes a side wall 211 and a bottom wall 212, and the side wall 211 and the bottom wall 212 are connected to each other to form an accommodating space 213;

The tweeter unit 30 includes a first magnetic part, a tweeter diaphragm 32 and a tweeter voice coil 33 connected to the tweeter diaphragm 32 . A high-pitched magnetic gap 36 for the high-pitched voice coil 33 to be inserted is formed therebetween, and the high-pitched diaphragm 32 is a plane metal diaphragm;

The bass unit 40 includes a second magnetic part, a bass diaphragm 42 and a bass voice coil 43 connected to the bass diaphragm 42. A bass magnet for the bass voice coil 43 to be inserted is formed between the second magnetic part and the side wall 211 In the gap 47, the woofer 40 and the tweeter 30 are arranged coaxially, and the woofer 40 and the tweeter 30 are arranged opposite to each other.

The magnetic yoke 20 is a magnetic conductive structure, and the side wall 211 of the accommodating portion 21 of the yoke 20 is circumferentially surrounded by the bottom wall 212, forming a accommodating space 213 in which the first magnetic portion can be placed. Fixed on the bottom wall 212 of the accommodating part 21, the side part of the first magnetic part and the side wall 211 of the accommodating part 21 are spaced apart to form a high-pitched magnetic gap 36, the high-pitched diaphragm 32 is fixed with the yoke 20, and the high-pitched voice coil The upper end of 33 is fixed to the tweeter diaphragm 32, and the tweeter coil 33 is inserted into the tweeter magnetic gap 36. Under the action of the magnetic field generated by the tweeter magnetic gap 36, the tweeter coil 33 vibrates after being energized, thereby driving the tweeter diaphragm 32 to vibrate and emit sound. And the bass unit 40 and the tweeter unit 30 are arranged coaxially away from each other, and the tweeter unit 30 is integrally embedded in the bass unit 40 to directly replace the central magnetic circuit part of the bass unit 40, which not only takes into account the high frequency and low frequency performance of the sound generating device 10, but also reduces the The overall height of the sound-generating device 10 is reduced, and the space occupied by the sound-generating device 10 in the earphone is reduced. The second magnetic part of the bass unit 40 is located outside the accommodating space 213, and the second magnetic part is spaced from the side wall 211 of the accommodating part 21 to form a bass magnetic gap 47, the lower end of the bass voice coil 43 and the bass diaphragm 42 is fixed, the bass voice coil 43 is inserted into the bass magnetic gap 47, and the bass voice coil 43 vibrates after being energized, thereby driving the bass diaphragm 42 to vibrate and produce sound. The tweeter unit 30 and the woofer unit 40 are located on the same axis and are arranged in the opposite direction, and the tweeter unit 30 adopts an embedded structure instead of the central magnetic circuit part of the woofer unit 40, which effectively reduces the overall height of the sound generating device 10 while providing magnetic flux. , the occupied space of the sound generating device 10 is reduced, and the efficiency of the magnetic circuit is improved. In addition, the tweeter diaphragm 32 is a flat metal diaphragm, that is, a flat structure is used to replace the diaphragm in the form of a traditional folding ring, so that the tweeter unit 30 has a larger frequency bandwidth; The whole machine of the sound generating device 10 does not need to reserve space for avoiding the folding ring structure, so that the product size is smaller; by setting the metal high-pitched diaphragm 32, the sound has a metallic texture, providing users with different hearing experiences.

Specifically, as shown in FIG. 1 and FIG. 5 , the yoke 20 further includes a connecting portion 22 extending outward from one end of the side wall 211 away from the bottom wall 212 , and the edge of the tweeter diaphragm 32 is fixed to the Connection part 22 . The opening of the accommodating space 213 faces upward, the connecting portion 22 extends outward from the upper edge of the side wall 211 , the first fixing ring 34 can be bonded to the upper end of the connecting portion 22 , and the edge of the tweeter diaphragm 32 is bonded to the first fixing ring 34 . On the upper side of the ring 34, there is a certain gap between the lower end of the tweeter diaphragm 32 and the first magnetic part, and the upper end is not blocked, so the tweeter diaphragm 32 has a large vibration space and excellent high frequency performance.

In one embodiment, the tweeter diaphragm 32 is a single-layer metal layer, and the metal layer is made of an alloy material, preferably a magnesium-aluminum alloy.

In another embodiment, the tweeter diaphragm 32 includes a metal layer and a damping layer disposed outside the metal layer. Specifically, the metal layer may be one or more of metal materials such as magnesium-lithium alloy, magnesium-aluminum alloy, aluminum film, titanium film, stainless steel, silicon steel, etc., preferably magnesium-aluminum alloy. The damping layer can be an adhesive film layer, PEEK, TPU, TPEE, etc. The damping property of the tweeter diaphragm 32 can be adjusted through the damping layer, which is beneficial to the balance of the vibration of the tweeter diaphragm 32 and brings a more delicate listening feeling.

In addition, the high-frequency diaphragm 32 is made of metal alloy material, which replaces the conventional elastomer material, and has the properties of high modulus and high strength. The modulus is generally greater than or equal to 30GPa, and the thickness is between 10 and 40um. At the same time, it can improve the high-frequency sound quality of the earphone, can replace the rubber diaphragm or paper diaphragm in the prior art, and provide users with different choices.

The magnetic yoke 20 further includes a surrounding portion 23 surrounding the outer circumference of the connecting portion 22 . The second magnetic portion is fixed to the side of the surrounding portion 23 away from the tweeter diaphragm 32 , that is, the upper end of the second magnetic portion and the lower end of the surrounding portion 23 are fixed. Fixed, so that the overall structure is compact, and the occupied space of the sound generating device 10 is reduced.

Optionally, the first magnetic part includes a first magnetic steel 31 and a first washer 35 fixed to the first magnetic steel 31 , the first magnetic steel 31 is fixed to the bottom wall 212 , and the second magnetic part includes a second magnetic steel 41 And the second washer 45 fixed on the second magnetic steel 41 , the second magnetic steel is fixed with the side of the surrounding portion 23 away from the tweeter diaphragm 32 , and the tweeter magnet is formed between the first washer 35 and the side wall 211 . A bass magnetic gap 47 is formed between the gap 36 , the second washer 45 and the side wall 211 . The first washer 35 matches the shape of the first magnetic steel 31, and is attached to the side of the first magnetic steel 31 away from the bottom wall 212 of the accommodating portion 21; the second washer 45 matches the shape of the second magnetic steel 41, It is attached to the side of the second magnetic steel 41 away from the surrounding portion 23 of the yoke 20 .

More specifically, the surrounding portion 23 includes a vertical wall 231 and a horizontal wall 232, the vertical wall 231 extends downward from the connecting portion 22, the horizontal wall 232 extends outward from the vertical wall 231, and the vertical wall 231 can be connected with the accommodating portion. The side wall 211 of 21 is parallel, the horizontal wall 232 can be parallel to the bottom wall 212 of the accommodating portion 21, the lower end of the horizontal wall 232 is fixed with the upper end of the second magnetic steel 41, and the edge of the horizontal wall 232 and the edge of the second magnetic steel 41 It can be flush, which can further reduce the occupied space of the sound-emitting device 10 . The yoke 20 may further include an extension portion 24 extending from the horizontal wall 232 of the surrounding portion 23 in a direction away from the second magnetic steel 41 , that is, the extension portion 24 extends upward from the outer edge of the horizontal wall 232 , and the upper end of the extension portion 24 may be connected to the outer edge of the horizontal wall 232 . The top of the tweeter diaphragm 32 is flush, which can protect the tweeter diaphragm 32 without increasing the overall height of the sound generating device 10 .

In one embodiment, as shown in FIG. 1 , FIG. 5 and FIG. 7 , the surrounding portion 23 is provided with a sound outlet 231 that communicates with the bass magnetic gap 47 . A through hole, a second through hole is opened on the horizontal wall 232 of the surrounding portion 23, the first through hole and the second through hole communicate together to form the sound outlet 231, and the bass magnetic gap 47 communicates with the sound outlet 231 to form a In the air flow channel of the bass unit 40 , when the bass diaphragm 42 vibrates, the air flow generated flows out of the sound outlet hole 231 through the bass magnetic gap 47 . The number of the sound holes 231 may be multiple, and the plurality of sound holes 231 may be evenly spaced along the circumferential direction of the surrounding portion 23 to further improve the low frequency performance of the woofer 40 .

As shown in FIG. 1 , FIG. 5 and FIG. 6 , the sound generating device 10 of this embodiment further includes a cover body 50 with a vent hole 511 , and the bass diaphragm 42 is fixed on the cover body 50 . The cover body 50 is used to cover the bass diaphragm 42 and fix the bass unit 40. The bass diaphragm 42 can be a diaphragm in the form of an ordinary folding ring, that is, the top of the ball in the middle and the surrounding ring parts. The edge is fixed on the cover body 50, and when the bass diaphragm 42 vibrates, the gas between the bass diaphragm 42 and the cover body 50 can flow out through the ventilation holes 511 provided on the cover body 50, which can avoid excessive air pressure inside the bass unit 40 , so as to prevent the performance of the woofer 40 from being affected.

More specifically, the cover body 50 includes a bottom cover 51 and a side cover 52 connected to the bottom cover 51 . The bottom cover 51 is spaced apart from the bass diaphragm 42 and has the above-mentioned ventilation holes 511 , and the side cover 52 is formed with a first step 521 . , the bass diaphragm 42 is fixed on the first step 521 by the second fixing ring 44 . The bottom cover 51 and the tweeter diaphragm 32 are arranged away from each other, and the bottom cover 51 has the functions of protection and dust prevention. Arrange. The edge of the bass diaphragm 42 is fixedly clamped between the first step 521 of the side cover 52 and the second fixing ring 44 , the second washer 45 is arranged between the second fixing ring 44 and the second magnetic steel 41 , the second The user of the fixing ring 44 stably fixes the bass diaphragm 42 on the side cover 52 , which enhances the strength of the overall structure of the sound generating device 10 .

As a preferred real-time manner, the bass unit 40 further includes a passive radiation membrane 46 located between the bass diaphragm 42 and the bottom cover 51 , the passive radiation membrane 46 is arranged corresponding to the bass diaphragm 42 , and the edge of the passive radiation membrane 46 is fixed on the On the second step 522 formed by the side cover 52, the second step 522 is located below the first step 521, and the passive radiation film 46 is spaced apart from the bass diaphragm 42 and the bottom cover 51, respectively. When the bass diaphragm 42 vibrates, the bass vibrates. The air pressure generated by the film 42 between the passive radiating films 46 is compressed or expanded. Under the action of the air pressure change, the passive radiating film 46 vibrates, which is convenient for the diffusion of low-frequency signals, which can improve the sense of bass volume, and can also reduce the resonance frequency, resonance The frequency is reduced by about 5% to 8%, which can effectively improve the low frequency performance of the sound generating device 10 . The bottom cover 51 can protect the passive radiation film 46 and prevent the passive radiation diaphragm from being accidentally scratched or collided. At the same time, the ventilation holes 511 on the bottom cover 51 can dredge the airflow between the passive radiation film 46 and the bottom cover 51 in time to ensure Internal and external air pressure balance. When assembling the sounding device 10, the passive radiating membrane 46 and the bass diaphragm 42 are sequentially fixed to the cover body 50, the second fixing ring 44 is fixed on the upper end of the edge of the bass diaphragm 42, and then the second fixing ring 44 is sequentially fixed on the second fixing ring 44. Second, the washer 45 and the second magnetic steel 41 are used to fix the magnetic yoke 20 on the second magnetic steel 41. The sound-emitting device 10 of this embodiment is not only easy to install, but also has a compact and firm structure.

The appearance of the sounding device 10 in this embodiment may be cylindrical, the first magnetic steel 31 is circular, the accommodating portion 21 is a circular groove, the second magnetic steel 41 may be circular, and the spacers are sleeved on The outer circumference of the accommodating portion 21 increases the magnetic flux of the woofer 40 . Of course, in other embodiments, the sounding device 10 may also be a rectangular body, the first magnetic steel 31 is a rectangular shape, and the second magnetic steel 41 is a rectangular annular structure.

In addition, the present invention also provides an earphone, which includes the sound producing device 10 as described above. Since the earphone adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Under the inventive concept of the present invention, the equivalent structure transformation made by the contents of the description and drawings of the present invention, or directly/indirectly applied to other All relevant technical fields are included within the scope of patent protection of the present invention.

Claims (12)

1. A sounding device, characterized in that the sounding device comprises:

   a magnetic yoke, the magnetic yoke includes an accommodating portion, the accommodating portion includes a side wall and a bottom wall, and the side wall and the bottom wall are connected to each other to form an accommodating space;

   A tweeter unit, the tweeter unit includes a first magnetic part, a tweeter diaphragm and a tweeter voice coil connected to the tweeter diaphragm, the first magnetic part is placed in the accommodating space, the first magnetic part A high-pitched magnetic gap is formed between the side wall and the high-pitched voice coil for insertion, and the high-pitched diaphragm is a plane metal diaphragm;

   A bass unit, the bass unit includes a second magnetic part, a bass diaphragm and a bass voice coil connected to the bass diaphragm, and a bass voice coil is formed between the second magnetic part and the side wall for insertion of the bass voice coil The bass magnetic gap, the woofer and the tweeter are coaxially arranged.
2. The sound-generating device according to claim 1, wherein the magnetic yoke further comprises a connecting portion extending outward from an end of the side wall away from the bottom wall, and the edge of the high-pitched diaphragm passes through the first The fixing ring is fixed on the connecting portion.
3. The sound-generating device according to claim 2, wherein the magnetic yoke further comprises a surrounding portion circumferentially surrounding the outer circumference of the connecting portion, and the second magnetic portion and the surrounding portion are away from the high-pitched vibration. One side of the membrane is fixed.
4. The sounding device according to claim 3, wherein the first magnetic part comprises a first magnetic steel and a first washer fixed on the first magnetic steel, the first magnetic steel and the bottom the wall is fixed, the second magnetic part includes a second magnetic steel and a second washer fixed to the second magnetic steel, the second magnetic steel is fixed to the side of the surrounding part away from the tweeter diaphragm The high-pitched magnetic gap is formed between the first washer and the side wall, and the bass magnetic gap is formed between the second washer and the side wall.
5. The sound-generating device according to claim 3, wherein the surrounding portion is provided with a sound outlet that communicates with the bass magnetic gap.
6. The sound-generating device according to claim 1, wherein the tweeter diaphragm is a single-layer metal layer.
7. The sound generating device according to claim 1, wherein the tweeter diaphragm comprises a metal layer and a damping layer disposed outside the metal layer.
8. The sound generating device according to claim 1, wherein the thickness of the tweeter diaphragm is 10-40 μm, and the elastic modulus of the tweeter diaphragm is greater than or equal to 30GPa.
9. The sound-generating device according to any one of claims 1 to 8, characterized in that, the sound-generating device further comprises a cover body with a vent hole, and the bass diaphragm is fixed on the cover body.
10. The sound generating device according to claim 9, wherein the cover body comprises a bottom cover and a side cover connected with the bottom cover, the bottom cover is spaced apart from the bass diaphragm and is provided with the through-hole. the air hole, the side cover is formed with a first step, and the bass diaphragm is fixed on the first step by a second fixing ring.
11. The sound generating device according to claim 10, wherein the bass unit further comprises a passive radiation membrane located between the bass diaphragm and the bottom cover, the passive radiation membrane corresponding to the bass diaphragm It is arranged that the edge of the passive radiation film is fixed on the second step formed by the side cover.
12. An earphone, characterized in that the earphone comprises the sound producing device according to any one of claims 1 to 11.

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