WO2020001229A1 - Loudspeaker and portable terminal - Google Patents

Abstract

Disclosed by the present invention are a loudspeaker and a portable terminal; the loudspeaker comprises a first vibration system, a second vibration system and a magnetic circuit system, the first vibration system comprising a first diaphragm and a voice coil disposed within the first diaphragm; the second vibration system comprises a second diaphragm provided opposite to the first diaphragm; the magnetic circuit system is disposed between the first diaphragm and the second diaphragm, and a first sound cavity is formed between the magnetic circuit system and the first diaphragm, the voice coil being accommodated in a magnetic gap of the magnetic circuit system; a second sound cavity is formed between the magnetic circuit system and the second diaphragm, and a through hole is provided between the first sound cavity and the second sound cavity. The loudspeaker provided by the present invention is provided with two vibration systems but employs only one voice coil and one magnetic circuit system such that a two-way sound-producing structure takes up a small volume, thereby being convenient for wide application in portable terminals.

Description

Speaker and portable terminal Technical field

The invention relates to the technical field of electroacoustics, and in particular, to a speaker and a portable terminal.

Background technique

Currently, speakers are widely used as important components of terminals with audio playback functions. Some terminals, especially portable terminals, such as mobile phones, tablet computers, and earphones, have very limited installation space for the speakers. Therefore, existing speakers that can be applied to small installation spaces usually use a single diaphragm to emit sound from the front. In order to realize two-way sound, the prior art provides a loudspeaker adopting a combined structure of two sets of voice coils and diaphragms and a magnetic circuit system. The magnetic circuit system has double magnetic gaps, which are respectively used to accommodate two voice coils. This type of speaker is usually large and difficult to be widely used. In addition, in the prior art structure, a combination of a voice coil and a diaphragm and another combination of a voice coil and a diaphragm work independently, one set is used as a high-frequency sound generator, and the other set is used as a low-frequency sound generator. Device, can not achieve simultaneous two-way sound.

Summary of the invention

The main purpose of the present invention is to provide a loudspeaker, which aims to solve the technical problem that the existing loudspeaker that realizes two-way sound is difficult to be widely used due to its large size.

To achieve the above object, the speaker provided by the present invention includes:

A first vibration system including a first diaphragm and a voice coil provided inside the first diaphragm;

A second vibration system including a second vibration film disposed opposite to the first vibration film; and

A magnetic circuit system is provided between the first and second diaphragms, a first acoustic cavity is formed between the magnetic circuit system and the first diaphragm, and the voice coil is housed in the magnetic circuit system A second acoustic cavity is formed between the magnetic circuit system and the second diaphragm, and a through hole is provided between the first acoustic cavity and the second acoustic cavity;

The voice coil drives the first diaphragm to vibrate and emit sound, and the airflow generated by the vibration of the first diaphragm is transmitted to the second vibrator through the first acoustic cavity, the through hole, and the second acoustic cavity in order. And the second diaphragm is driven to vibrate and sound.

Preferably, the through hole is provided on the magnetic circuit system.

Preferably, the magnetic circuit system includes a magnetically permeable yoke, and a central magnetic circuit portion and an edge magnetic circuit portion provided on the magnetic yoke; a space is formed between the central magnetic circuit portion and the lateral magnetic circuit portion to accommodate the sound The magnetic gap of the coil; at least one of the central magnetic circuit portion and the side magnetic circuit portion is provided with a permanent magnet; the through hole includes a central through hole provided corresponding to the magnetic yoke and the central magnetic circuit portion.

Preferably, the central magnetic circuit portion includes a magnetic yoke, a central magnetic steel provided at the bottom of the magnetic yoke, and a magnetic conductive plate provided on the top of the central magnetic steel;

The magnetic yoke is provided with a first inner hole, the central magnetic steel is provided with a second inner hole, the magnetic yoke is provided with a third inner hole, the first inner hole, the second inner hole, and The third inner hole communicates with the central through hole.

Preferably, the central magnetic steel comprises two sub-magnetic steels spliced together, and a seam between the two sub-magnetic steels is connected to the second inner hole; wherein the two sub-magnetic steels pass through the The vertical plane at the center of the second inner hole is symmetrical; or, the two sub-magnetic steels are symmetrical with respect to the center of the second inner hole.

Preferably, the central magnetic steel is provided with a slit connecting the inner wall surface of the second inner hole and the outer peripheral surface of the central magnetic steel.

Preferably, the magnetic circuit system includes a magnetically permeable yoke, and a central magnetic circuit portion and an edge magnetic circuit portion provided on the magnetic yoke; a space is formed between the central magnetic circuit portion and the lateral magnetic circuit portion to accommodate the sound The magnetic gap of the coil; at least one of the central magnetic circuit portion and the side magnetic circuit portion is provided with a permanent magnet; the through hole further includes an edge through hole provided on the magnetic yoke corresponding to the magnetic gap At least one of the side through holes is provided, and when a plurality of the side through holes are provided, a plurality of the side through holes are arranged at intervals along the circumferential direction of the magnetic gap; or, the through holes further include An edge through hole is provided at an end of the magnetic yoke.

Preferably, a sound generated by a side of the first diaphragm away from the second diaphragm is received by a human ear, and a sound generated by a side of the second diaphragm away from the first diaphragm is received by the human ear. receive.

Preferably, the second diaphragm includes a central portion, a folded ring portion provided around the central portion, and a fixed portion provided around the folded portion; the central portion is a flat sheet-like structure, and the folded ring portion is formed by a convex portion; Structure, or the folded ring portion is a wavy structure composed of at least one protrusion and at least one depression.

Preferably, the second diaphragm further includes a composite layer bonded to the central portion.

Preferably, the through-hole includes a central through-hole provided corresponding to the center of the first diaphragm, the composite layer is provided corresponding to the central through-hole, the composite layer is convexly disposed, and the convexly-exposed composite layer is The concave surface faces the central through hole.

Preferably, the first diaphragm includes a central portion, a folded ring portion provided around the central portion, and a fixed portion provided around the folded ring portion. The central portion of the first diaphragm is a flat sheet-like structure.

The present invention also provides a portable terminal including a housing having an accommodation cavity inside the portable terminal. The portable terminal further includes the speaker, and the speaker includes a first vibration system, a second vibration system, and a magnetic circuit system. The first vibration system includes a first vibration membrane and a voice coil provided inside the first vibration membrane; the second vibration system includes a second vibration membrane opposite to the first vibration membrane; the A magnetic circuit system is provided between the first and second diaphragms, a first acoustic cavity is formed between the magnetic circuit system and the first diaphragm, and the voice coil is housed in the magnetic circuit system. In the magnetic gap, a second acoustic cavity is formed between the magnetic circuit system and the second diaphragm, and the magnetic circuit system is provided with a through hole connecting the first acoustic cavity and the second acoustic cavity; the speaker is installed in the In the accommodating cavity, the casing is provided with a first acoustic hole corresponding to the first diaphragm and a second acoustic hole corresponding to the second diaphragm.

Preferably, the casing has opposite front and rear surfaces, the first sound hole is provided on the front surface of the casing, and the second sound hole is provided on the opposite surface of the casing; A space where the membrane faces away from the second diaphragm is in communication with the first acoustic hole, and the first acoustic hole is used to conduct sound emitted by the first diaphragm; the second diaphragm faces away from the first diaphragm The space of the membrane is in communication with the second sound hole, and the second sound hole is used to conduct sound emitted by the second diaphragm.

The speaker of the present invention adopts two sets of vibration systems, but only adopts one set of voice coil and magnetic circuit system to realize two-way sound. The structure occupies a small volume, which is convenient to be widely applied to portable terminals. When the speaker of the present invention works, the diaphragm of the first vibration system is directly driven by the magnetic circuit system, so that the air of the first acoustic cavity is compressed or expanded. Because the first acoustic cavity and the second acoustic cavity are provided with a through-hole communication, the air passes Circulation in the through hole, driven by the airflow, the diaphragm of the second vibration system vibrates and sounds, and the second acoustic cavity expands or compresses in conjunction with it, thereby forming the first diaphragm on the front to actively radiate and the second diaphragm on the reverse. The passive radiation two-way sound structure, and the first diaphragm and the second diaphragm vibrate at the same time to achieve two-way sound at the same time. When applied to a portable terminal, the speaker of the present invention can emit sound in two directions of the portable terminal through the first vibration system and the second vibration system, respectively.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structure shown in the drawings without paying creative labor.

FIG. 1 is a schematic front structural diagram of an embodiment of a speaker according to the present invention; FIG.

FIG. 2 is a schematic diagram of a rear structure of the speaker in FIG. 1; FIG.

3 is a schematic cross-sectional structure diagram of the speaker in FIG. 1, which illustrates a first embodiment of a second diaphragm;

4 is an enlarged schematic diagram of the right end of the structure in FIG. 3;

FIG. 5 is an enlarged schematic diagram of the right end of the structure in FIG. 3, wherein the first embodiment of the second diaphragm is replaced with the second embodiment of the second diaphragm;

FIG. 6 is a schematic cross-sectional structure diagram of the speaker in FIG. 1, which illustrates a third embodiment of a second diaphragm; FIG.

FIG. 7 is a partially enlarged view at A in FIG. 6.

8 is a schematic structural diagram of a part of the speaker in FIG. 1;

9 is a schematic diagram of an exploded structure of the speaker in FIG. 1, which illustrates a first embodiment of a magnetic circuit system;

10 is a schematic structural diagram of a second embodiment of a magnetic circuit system of a speaker according to the present invention;

11 is a schematic structural diagram of a third embodiment of a magnetic circuit system of a speaker according to the present invention;

12 is a schematic structural diagram of a fourth embodiment of a magnetic circuit system of a speaker according to the present invention;

13 is a schematic front structural diagram of an embodiment of a portable terminal according to the present invention;

14 is a schematic structural diagram of a rear surface of the portable terminal in FIG. 13;

FIG. 15 is a schematic view of a partial cross-sectional structure at B in FIG. 13.

BRIEF DESCRIPTION OF THE DRAWINGS

Label	name	Label	name	Label		name
1	First vibration system	321	Center Through Hole	5	Second acoustic cavity
11	First diaphragm	322	Side through hole	6	shell
12	Voice coil	33	Magnetic yoke	7	The front cover
2	Second vibration system	331	First inner hole	71	Front sound hole

21a, 21b, 21c			Second diaphragm	34a, 34b	Central magnetic steel	8	Back cover
211	Center	34c, 34d	Central magnetic steel	81	Rear sound hole
212a, 212b			Folding ring	341a, 341b	Second inner hole	100	Portable terminal
213	Fixed part	341c, 341d	Second inner hole	110	case
214	Composite layer	342b, 342c		Child magnet	120	Receiving cavity
3a, 3b	Magnetic circuit system	342d		Cut	130	First sound hole
3c, 3d	Magnetic circuit system	35	Magnetic plate	140	Second sound hole
31	Magnetic gap	351	Third inner hole	210	speaker
32	Through hole	4	First acoustic cavity	AF	airflow

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

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described 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, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person 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 indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between components in a specific posture (as shown in the drawings). The relative positional relationship, movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on those that can be realized by a person of ordinary skill in the art. When the combination of technical solutions conflicts or cannot be achieved, such a combination of technical solutions should be considered non-existent. , Is not within the scope of protection claimed by the present invention.

The present invention provides a speaker. Please refer to FIG. 1 to FIG. 3 and FIG. 8. In one embodiment, the speaker 210 includes:

The first vibration system 1 includes a first diaphragm 11 and a voice coil 12 provided inside the first diaphragm 11;

The second vibration system 2 includes a second diaphragm (21a, 21b, 21c) disposed opposite the first diaphragm 11; and

The magnetic circuit system (3a, 3b, 3c, 3d) is provided between the first diaphragm 11 and the second diaphragm (21a, 21b, 21c), and the magnetic circuit system (3a, 3b, 3c, 3d) and the first A first acoustic cavity 4 is formed between the diaphragm 11 and a voice coil 12 is housed in the magnetic gap 31 of the magnetic circuit system (3a, 3b, 3c, 3d); the magnetic circuit system (3a, 3b, 3c, 3d) and the second vibration A second acoustic cavity 5 is formed between the membranes (21a, 21b, 21c), and a through hole 32 is provided between the first acoustic cavity 4 and the second acoustic cavity 5.

The voice coil 12 drives the first diaphragm 11 to vibrate and emit sound, and the airflow generated by the first diaphragm 11 to vibrate and emit sound passes through the first acoustic cavity 4, the through hole 32, and the second acoustic cavity 5 in order. Go to the second diaphragm (21a, 21b, 21c), and then drive the second diaphragm (21a, 21b, 21c) to vibrate and sound.

In this embodiment, in order to simplify the description, the position when the first diaphragm 11 of the speaker 210 is placed upward is used as a reference to define the upper and lower sides, that is, the first diaphragm 11 faces away from the magnetic circuit system (3a, 3b, 3c, 3d). The side of is the top, and the side of the first diaphragm 11 facing the magnetic circuit system (3a, 3b, 3c, 3d) is the bottom.

The first vibration system 1 can refer to the existing form. Specifically, the voice coil 12 is fixedly connected to the first diaphragm 11 and extends into the magnetic gap 31. The current flowing through the voice coil 12 changes due to the amperage of different magnitudes. The vibration of the voice coil 12 drives the first diaphragm 11 to vibrate, and its energy conversion mode is electric energy-mechanical energy-acoustic energy. In order to adjust the frequency characteristics of the vibration, the first vibration system 1 may further include a weight.

The form of the magnetic circuit system (3a, 3b, 3c, 3d) can also refer to the existing structure. For example, the magnetic gap 31 can be formed between the central magnetic steel (34a, 34b, 34c, 34d) and the edge magnetic steel, or A center magnetic steel (34a, 34b, 34c, 34d) and a side wall of the magnetic yoke 33 may be formed. The top shape of the center magnetic steel (34a, 34b, 34c, 34d) may be circular or rounded rectangle.

In order to facilitate the installation of the first vibration system 1, the second vibration system 2 and the magnetic circuit system (3a, 3b, 3c, 3d) therebetween, the speaker 210 further includes a housing 6, a front cover 7 and a rear cover 8, the housing 6 is used to accommodate the first vibration system 1, the second vibration system 2 and the magnetic circuit system (3a, 3b, 3c, 3d). The front cover 7 and the rear cover 8 cooperate with the housing 6 to form a protective frame. Specifically, the edge portion of the first diaphragm 11 for fixing is clamped by the front cover 7 and the housing 6, and the second diaphragm (21a, 21b, 21c) ) The edge portion for fixing is clamped by the back cover 8 and the casing 6. The front cover 7 is provided corresponding to the first vibration system 1 and is provided with a front sound hole 71 for emitting sound, and the rear cover 8 is corresponding to the second vibration system 2 and is provided with a rear sound hole 81 for emitting sound.

The opening form of the through hole 32 may be only a magnetic circuit system (3a, 3b, 3c, 3d), or it may be opened on the housing 6, as long as it can communicate with the first acoustic cavity 4 and the second acoustic cavity 5, and the The size of the flow area is sufficient to enable the airflow flowing in the through hole 32 to push the second diaphragm (21a, 21b, 21c) to make a sound.

The speaker 210 of the present invention adopts two sets of vibration systems, but uses only one set of voice coils 12 and magnetic circuit systems (3a, 3b, 3c, 3d) to achieve two-way sound. The structure occupies a small volume, which is convenient for wide application in portable terminals. 100. When the speaker 210 of the present invention works, the magnetic circuit system (3a, 3b, 3c, 3d) directly drives the diaphragm of the first vibration system 1 so that the air of the first acoustic cavity 4 is compressed or expanded. The second acoustic cavity 5 is provided with a through-hole 32 for communication. Air flows through the through-hole 32. Under the impetus of the air flow, the diaphragm of the second vibration system 2 vibrates and sounds, and the second acoustic cavity 5 expands or compresses in conjunction with it. This forms a two-way sounding structure in which the first diaphragm 11 on the front actively radiates, and the second diaphragm (21a, 21b, 21c) on the opposite side passively radiates, and the first diaphragm 11 and the second diaphragm (21a, 21b, 21c). ) Simultaneous vibration to achieve two-way sound at the same time. When applied to the portable terminal 100, the loudspeaker 210 of the present invention can make sounds in both directions of the portable terminal 100 through the first vibration system 1 and the second vibration system 2 respectively.

Further, the through hole 32 is provided on the magnetic circuit system (3a, 3b, 3c, 3d).

In this embodiment, the through hole 32 may be opened on the bottom wall of the magnetic yoke 33 to correspond to the magnetic gap 31 and the second acoustic cavity 5 or on the side of the central magnetic steel (34a, 34b, 34c, 34d) and on The central magnetic steel (34a, 34b, 34c, 34d) passes through the bottom wall of the yoke 33 after being bent downward. As an example, the air flow in the through hole 32 is shown as AF in FIG. 3.

Further, the magnetic circuit system includes a magnetically permeable yoke 33 and a central magnetic circuit portion and an edge magnetic circuit portion (both not labeled) provided on the magnetic yoke 33;

A magnetic gap 31 is formed between the central magnetic circuit portion and the side magnetic circuit portion to accommodate the voice coil 12;

At least one of the central magnetic circuit portion and the side magnetic circuit portion is provided with a permanent magnet;

The through hole 32 includes a central through hole 321 provided corresponding to the magnetic yoke 33 and the central magnetic circuit portion.

In this embodiment, since the amplitude of the central portion of the first diaphragm 11 is usually the largest, a larger amount of airflow can be transmitted by setting the central through hole 321 corresponding to the central portion of the first diaphragm 11 to better use the airflow to push The second diaphragm (21a, 21b, 21c).

Further, referring to FIG. 9 to FIG. 12, the central magnetic circuit part of the magnetic circuit system (3a, 3b, 3c, 3d) includes a central magnetic steel (34a, 34b, 34c, 34d) provided at the bottom of the magnetic yoke 33, And a magnetically permeable plate 35 provided on top of the central magnetic steel (34a, 34b, 34c, 34d);

The inner yoke 33 is provided with a first inner hole 331, the central magnetic steel (34a, 34b, 34c, 34d) is provided with a second inner hole (341a, 341b, 341c, 341d), and the third yoke 33 is provided with a third inner hole The inner hole 351, the first inner hole 331, the second inner hole (341a, 341b, 341c, 341d) and the third inner hole 351 communicate with each other to form a central through hole 321.

In this embodiment, the central through hole 321 directly penetrates the magnetically permeable yoke 33, the central magnetic steel (34a, 34b, 34c, 34d) and the magnetically permeable plate 35. The form is simple, and it is beneficial to promote the first acoustic cavity 4 and the second acoustic cavity 5 Gas circulation between.

Further, referring to the magnetic circuit systems of the second and third embodiments shown in FIG. 10 and FIG. 11, the central magnetic steel (34b, 34c) includes two sub-magnetic steels (342b, 342c), which are spliced together. The seam of steel (342b, 342c) is connected to the second inner hole (341b, 341c). In this embodiment, the second inner hole (341b, 341c) is formed by splicing two sub-magnetic steels (342b, 342c), and the inner wall surface of the second inner hole (341b, 341c) is actually converted into each sub-magnetic steel (342b). , 342c), that is, the groove wall surface that is open on the outer peripheral surface of the sub magnetic steel (342b, 342c), so that the second inner hole (341b, 341c) can be formed for the central magnetic steel (34b, 34c). Convenience.

Preferably, in order to facilitate the assembly and improve the interchangeability of the raw materials of the two magnets (342b, 342c), the two magnets (342b, 342c) pass through the vertical plane of the center of the second inner hole (341b, 341c). The symmetrical or two-member magnetic steel (342b, 342c) is symmetrical about the center of the second inner hole (341b, 341c). Specifically, when assembling the central magnetic steel (34b, 34c), the blanks of the two magnetic steels (342b, 342c) before being magnetized can be spliced first, and then magnetized. The blanks are interchangeable, so only one shape and size blanks need to be provided.

Further, referring to the fourth embodiment of the magnetic circuit system shown in FIG. 12, the central magnetic steel 34d is provided with a slit 342d that communicates the inner wall surface of the second inner hole 341d and the outer peripheral surface of the central magnetic steel 34d. In this embodiment, the second inner hole 341d is suitable to be processed by a wire cutting process. Specifically, the cut seam 342d can be processed first, and then the second inner hole 341d can be processed, compared with drilling the second inner hole 341d. More practical.

Preferably, please refer to FIG. 8 to FIG. 12 again. The first diaphragm 11, the second diaphragm (21a, 21b, 21c), and the central magnetic steel (34a, 34b, 34c, 34d) are all elongated. The long axis of the diaphragm 11, the second diaphragm (21a, 21b, 21c) and the central magnetic steel (34a, 34b, 34c, 34d) are located in the same vertical plane, and the central through hole 321 is along the central magnetic steel (34a, 34b) , 34c, 34d).

In this embodiment, it can be understood that the vertical plane is a plane parallel to the up-down direction. Since the first diaphragm 11, the second diaphragm (21a, 21b, 21c), and the central magnetic steel (34a, 34b, 34c) 34d) are all long strips. Correspondingly, the shape of the speaker 210 is also a long strip. Compared with a circular shape, this structure has a higher space utilization efficiency when applied to the portable terminal 100. At the same time, under the premise of the same area, the long first diaphragm 11 and the second diaphragm (21a, 21b, 21c) are easier to obtain a larger amplitude, and the first diaphragm 11 can actively move toward the center. The through hole 321 fan a larger amount of air, and the second diaphragm (21a, 21b, 21c) is more easily pushed by the airflow passing through the central through hole 321.

Further, the magnetic circuit system includes a magnetically permeable yoke 33 and a central magnetic circuit portion and an edge magnetic circuit portion (both not labeled) provided on the magnetic yoke 33;

A magnetic gap 31 is formed between the central magnetic circuit portion and the side magnetic circuit portion to accommodate the voice coil 12;

At least one of the central magnetic circuit portion and the side magnetic circuit portion is provided with a permanent magnet;

The through-hole 32 also includes an edge through-hole 322 provided on the magnetic yoke 33 corresponding to the magnetic gap 31. The edge through-hole 322 is provided with at least one. The side through-holes 322 are arranged at intervals along the circumferential direction of the magnetic gap 31. Alternatively, the through-holes 322 further include side through-holes 322 provided at the ends of the magnetic yoke 33.

In this embodiment, the side through-holes 322 may be provided separately at the ends of the magnetic yoke 33 or on the magnetic yoke 33 and corresponding to the magnetic gap 31. In a preferred embodiment, the side through-holes 322 may also be provided. The combination with the central through hole 321 further increases the connectivity between the first acoustic cavity 4 and the second acoustic cavity 5, so that when the first diaphragm 11 vibrates, more air can flow in the unit time. The flow between the one acoustic cavity 4 and the second acoustic cavity 5 can also be driven to a greater extent by the second diaphragm (21a, 21b, 21c).

It can be understood that at least one side through hole 322 is provided. In order to increase the flow area as much as possible, a plurality of side through holes 322 are provided. The plurality of side through holes 322 are arranged at intervals along the circumferential direction of the magnetic gap 31. It can not only ensure the balance of the connection, but also make the magnetic circuit balanced.

Preferably, the magnetic circuit system (3a, 3b, 3c, 3d) includes a magnetic yoke 33, a central magnetic steel (34a, 34b, 34c, 34d) provided at the bottom of the magnetic yoke 33, and a central magnetic steel (34a) , 34b, 34c, 34d) on top of the magnetically permeable plate 35;

The inner yoke 33 is provided with a first inner hole 331, the central magnetic steel (34a, 34b, 34c, 34d) is provided with a second inner hole (341a, 341b, 341c, 341d), and the third yoke 33 is provided with a third inner hole The inner hole 351, the first inner hole 331, the second inner hole (341a, 341b, 341c, 341d) and the third inner hole 351 communicate with each other to form a central through hole 321, and an edge through hole 322 is opened at the bottom of the magnetic yoke 33. Since the bottom of the yoke 33 is closer to the second acoustic cavity 5 than the center magnetic steel (34a, 34b, 34c, 34d) and the permeable plate 35, the side through hole 322 is also most convenient for processing at the bottom of the yoke 33 .

Further, the first diaphragm 11, the second diaphragm (21a, 21b, 21c) and the center magnetic steel (34a, 34b, 34c, 34d) are all long strips, and the first diaphragm 11, and the second diaphragm ( The major axes of 21a, 21b, 21c) and the central magnetic steel (34a, 34b, 34c, 34d) are located in the same vertical plane, and the central through hole 321 extends along the length of the central magnetic steel (34a, 34b, 34c, 34d). .

In this embodiment, it can be understood that the vertical plane is a plane parallel to the up-down direction. Since the first diaphragm 11, the second diaphragm (21a, 21b, 21c), and the central magnetic steel (34a, 34b, 34c) 34d) are all long strips. Correspondingly, the shape of the speaker 210 is also a long strip. Compared with a circular shape, this structure has a higher space utilization efficiency when applied to the portable terminal 100. At the same time, under the premise of the same area, the long first diaphragm 11 and the second diaphragm (21a, 21b, 21c) are easier to obtain a larger diaphragm, and the first diaphragm 11 can be actively fanned A larger amount of air, and the second diaphragm (21a, 21b, 21c) is more easily pushed by the airflow passing through the central through hole 321 and the side through hole 322.

Further, the sound generated by the side of the first diaphragm 11 facing away from the second diaphragm (21a, 21b, 21c) is received by the human ear, and the side of the second diaphragm (21a, 21b, 21c) facing away from the first diaphragm 11 The generated sound is received by the human ear. In this embodiment, both the first diaphragm 11 and the second diaphragm (21a, 21b, 21c) can generate sounds in the human auditory sound range, for example, the frequency range is from 20 to 20000HZ. In this way, the user can Directly receive audio information in both directions. It can be understood that, in other embodiments, the first diaphragm 11 and the second diaphragm (21a, 21b, 21c) can also be used to generate sounds in other frequency ranges, such as the "sound code" corresponding to the human ear's hearing. This sound can be decoded by the machine to achieve the corresponding signal transmission.

Further, referring to FIG. 4 and FIG. 5, the second diaphragm (21a, 21b) includes a central portion 211, a folding ring portion (212a, 212b) provided around the central portion 211, and a folding ring portion (212a, 212b). The fixed portion 213; the central portion 211 is a flat sheet structure, and the folded ring portion (212a, 212b) is a structure composed of one protrusion, or the folded ring portion is a wave composed of at least one protrusion and at least one depression形 结构。 Shaped structure.

In this embodiment, the central portion 211 is used to feel the dense and dense changes in the air in the second acoustic cavity 5 and to generate vibrations, that is, passive radiation sound. By setting the central portion 211 as a flat sheet structure, the second diaphragm ( 21a, 21b) take up less space in the up and down direction and can generate a sufficiently large amplitude. The folding ring portions (212a, 212b) provide a certain compliance for the movement of the central portion 211, that is, provide a certain flexibility, so that the central portion 211 is more easily pushed by the airflow passing through the central through hole 321 and the side through hole 322.

Further, referring to FIG. 6, the second diaphragm 21 c further includes a composite layer 214 coupled to the central portion 211. Providing the composite layer 214 can reduce the quality of the second diaphragm 21c and ensure that the second diaphragm 21c is more easily pushed by the airflow. Preferably, in order to ensure better sound emission performance of the passively oscillating second diaphragm 21c, the composite layer 214 is made of a material with a higher specific modulus, for example, aluminum composite material, aluminum, aluminum-magnesium alloy, magnesium-lithium alloy material, carbon fiber, PEN ( Polyethylene naphthalate), LCP (Liquid Crystal Polymer), foam, etc.

Further, the through-hole 32 includes a central through-hole 321 provided corresponding to the center of the first diaphragm 11, a composite layer 214 is provided corresponding to the central through-hole 321, the composite layer 214 is convexly arranged, and the concave surface of the convex composite layer 214 faces the central through-hole. 321.

In this embodiment, the concave surface of the composite layer 214 faces the central through hole 321, so that when the airflow flows from the central through hole 321 to the second acoustic cavity 5 and acts on the composite layer 214, the composite layer 214 can be "wrapped" and act on the second layer The thrust of the diaphragm 21c can be more concentratedly applied to the center portion 211 of the second diaphragm 21c, and a larger amplitude of vibration can be generated.

Further, since the second diaphragm (21a, 21b, 21c) uses passive radiation to emit sound, in order to ensure that the second diaphragm (21a, 21b, 21c) is more easily pushed by the airflow, the second diaphragm (21a, 21b, 21c) Use a material with a relatively low elastic modulus. For example, if the first diaphragm 11 and the second diaphragm (21a, 21b, 21c) each include a center portion, a folded ring portion provided around the center portion, and a fixed portion provided around the folded ring portion If the two diaphragms have the same structure, the elastic modulus at the center of the second diaphragm (21a, 21b, 21c) is lower than the elastic modulus at the center of the first diaphragm, and the second diaphragm (21a, 21b) 21c) The elastic modulus of the folded ring portion is lower than that of the folded portion of the first diaphragm 11.

Further, the first diaphragm 11 includes a central portion, a folded ring portion provided around the central portion, and a fixed portion provided around the folded portion. The central portion of the first diaphragm 11 is a planar sheet structure. Similarly, by setting the central portion of the first diaphragm 11 as a flat sheet-like structure, the space occupied by the first diaphragm 11 in the up-down direction is small, and a sufficiently large amplitude can be generated. After combining the embodiment in which the central portion of the second diaphragm (21a, 21b, 21c) is also provided with a sheet-like structure, the speaker body provided by the present invention forms a thin structure in the up-down direction as a whole, so that it is easier to apply to a flat shape Installation space.

The present invention also provides a portable terminal 100. Please refer to FIG. 13 to FIG. 15. The portable terminal 100 includes a housing 110 having an accommodation cavity 120 therein. The portable terminal 100 further includes a speaker 210. For the structure, referring to the foregoing embodiments, since the portable terminal 100 adopts all the technical solutions of all the embodiments described above, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be repeated one by one here.

The speaker 210 is installed in the accommodating cavity 120. The housing 110 is provided with a first sound hole 130 corresponding to the first diaphragm 11 and a second sound hole 140 corresponding to the second diaphragm (21a, 21b, 21c). Preferably, in order to shorten the propagation path of the sound inside the casing 110 and reduce the sound resistance, the first sound hole 130 is opened at a position of the casing 110 directly opposite the first diaphragm 11, and the second sound hole 140 is opened at the housing 110. Is directly opposite the second diaphragm (21a, 21b, 21c).

Further, the casing 110 has opposite front and rear surfaces, the first sound hole 130 is provided on the front surface of the casing 110, and the second sound hole 140 is provided on the opposite surface of the casing 110;

The space of the first diaphragm 11 facing away from the second diaphragm (21a, 21b, 21c) is in communication with the first acoustic hole 130, and the first acoustic hole 130 is used to conduct the first diaphragm 11 Make a sound

The space of the second diaphragm (21a, 21b, 21c) facing away from the first diaphragm 11 is in communication with the second acoustic hole 140, and the second acoustic hole 140 is used to conduct the second diaphragm (21a, 21b, 21c). 21a, 21b, 21c). In this way, the speaker 210 can make sounds in the forward and reverse directions of the portable terminal 100 through the first vibration system 1 and the second vibration system 2 respectively.

The above is only a preferred embodiment of the present invention, and therefore does not limit the scope of the patent of the present invention. Any equivalent structural transformation or direct / indirect use of the description and drawings of the present invention under the inventive concept of the present invention All other related technical fields are included in the patent protection scope of the present invention.

Claims (14)

1. A loudspeaker, comprising:

   A first vibration system including a first diaphragm and a voice coil provided inside the first diaphragm;

   A second vibration system including a second vibration film disposed opposite to the first vibration film; and

   A magnetic circuit system is provided between the first and second diaphragms, a first acoustic cavity is formed between the magnetic circuit system and the first diaphragm, and the voice coil is housed in the magnetic circuit system A second acoustic cavity is formed between the magnetic circuit system and the second diaphragm, and a through hole is provided between the first acoustic cavity and the second acoustic cavity;

   The voice coil drives the first diaphragm to vibrate and emit sound, and the airflow generated by the vibration of the first diaphragm is transmitted to the second vibrator through the first acoustic cavity, the through hole, and the second acoustic cavity in order. And the second diaphragm is driven to vibrate and sound.
2. The loudspeaker according to claim 1, wherein the through hole is provided on the magnetic circuit system.
3. The loudspeaker according to claim 2, wherein:

   The magnetic circuit system includes a magnetically permeable yoke and a central magnetic circuit portion and an edge magnetic circuit portion provided on the magnetic yoke;

   Forming a magnetic gap accommodating the voice coil between the central magnetic circuit portion and the side magnetic circuit portion;

   At least one of the central magnetic circuit portion and the side magnetic circuit portion is provided with a permanent magnet;

   The through hole includes a central through hole provided corresponding to the magnetic yoke and a central magnetic circuit portion.
4. The speaker according to claim 3, wherein

   The central magnetic circuit part includes a central magnetic steel provided at the bottom of the magnetic yoke, and a magnetic conductive plate provided at the top of the magnetic yoke; the magnetic yoke is provided with a first inner hole, and the center The magnetic steel is provided with a second inner hole, and the magnetic yoke is provided with a third inner hole. The first inner hole, the second inner hole, and the third inner hole communicate with each other to form the central through hole.
5. The loudspeaker according to claim 4, wherein the central magnetic steel comprises two sub-magnetic steels spliced together, and a seam between the two sub-magnetic steels is connected to the second inner hole, wherein,

   The two sub-magnetic steels are symmetrical about a vertical plane passing through the center of the second inner hole; or

   The two sub-magnetic steels are symmetrical about the center of the second inner hole.
6. The loudspeaker according to claim 4, wherein the central magnetic steel is provided with a slit connecting the inner wall surface of the second inner hole and the outer peripheral surface of the central magnetic steel.
7. The loudspeaker according to any one of claims 2 to 6, wherein the magnetic circuit system comprises a magnetically permeable yoke and a central magnetic circuit portion and an edge magnetic circuit portion provided on the magnetic yoke;

   Forming a magnetic gap accommodating the voice coil between the central magnetic circuit portion and the side magnetic circuit portion;

   At least one of the central magnetic circuit portion and the side magnetic circuit portion is provided with a permanent magnet;

   The through hole further includes an edge through hole provided on the magnetic yoke corresponding to the magnetic gap. At least one of the side through holes is provided. When a plurality of the side through holes are provided, a plurality of the sides are provided. The through holes are arranged at intervals along the circumferential direction of the magnetic gap; or

   The through hole further includes an edge through hole provided at an end of the magnetic yoke.
8. The loudspeaker according to any one of claims 1-6, wherein a sound generated by a side of the first diaphragm facing away from the second diaphragm is received by a human ear, and the second diaphragm facing away from The sound generated on the side of the first diaphragm is received by the human ear.
9. The loudspeaker according to claim 1, wherein the second diaphragm includes a central portion, a folded ring portion provided around the central portion, and a fixed portion provided around the folded portion; the central portion is a planar sheet structure The folded ring portion is a structure composed of one protrusion, or the folded ring portion is a wave-shaped structure composed of at least one protrusion and at least one depression.
10. The speaker according to claim 9, wherein the second diaphragm further comprises a composite layer bonded to the central portion.
11. The loudspeaker according to claim 10, wherein the through hole comprises a central through hole provided corresponding to the center of the first diaphragm, the composite layer is provided corresponding to the central through hole, and the composite layer is convex It is provided that the convex surface of the composite layer has a concave surface facing the central through hole.
12. The loudspeaker according to any one of claims 1 to 6, and 9 to 11, wherein the first diaphragm includes a central portion, a folded ring portion provided around the central portion, and a fixed portion provided around the folded ring portion. The central portion of the first diaphragm is a planar sheet structure.
13. A portable terminal includes a housing, and the housing has an accommodation cavity therein, further comprising a speaker according to any one of claims 1-12, wherein the speaker is installed in the accommodation cavity, and The casing is provided with a first sound hole corresponding to the first diaphragm and a second sound hole corresponding to the second diaphragm.
14. The portable terminal according to claim 13, wherein the housing has a front surface and a rear surface opposite to each other, the first sound hole is provided on the front surface of the housing, and the second sound hole is provided on the front surface of the housing. Mentioned opposite side of the shell;

    A space of the first diaphragm facing away from the second diaphragm is in communication with the first sound hole, and the first sound hole is used to conduct sound emitted by the first diaphragm;

    A space of the second diaphragm away from the first diaphragm is in communication with the second sound hole, and the second sound hole is used to conduct sound emitted by the second diaphragm.

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