CN218277116U

CN218277116U - Double-magnetic circuit loudspeaker

Info

Publication number: CN218277116U
Application number: CN202221993071.2U
Authority: CN
Inventors: 陈江; 邓宏国
Original assignee: Shenzhen Dancing Future Technology Ltd
Current assignee: Shenzhen Dancing Future Technology Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2023-01-10
Anticipated expiration: 2032-07-27

Abstract

The utility model discloses a double magnetic circuit loudspeaker, which comprises a basin frame, a first sound film component arranged on one side of the basin frame, a first magnetic circuit component interacted with the first sound film component, a second sound film component arranged on the other side of the basin frame, and a second magnetic circuit component interacted with the second sound film component; the effective vibration area of the first sound film component is 3/4 to 1 of the effective vibration area of the second sound film component; and a limiting structure is arranged in the vibration direction of the first voice diaphragm component. The whole loudspeaker has wide frequency response, high sensitivity and small total harmonic distortion.

Description

Double magnetic circuit loudspeaker

Technical Field

The utility model relates to an electroacoustic technology field, the more specifically double magnetic circuit speaker that says so.

Background

With the rapid update and iteration of acoustic products, the requirements of consumers on the acoustic products become more severe, especially in the direction of comfort, portability and high sound quality. At present, most of in-ear earphones adopt a loudspeaker with a single vibration system and a single magnetic circuit system, and basically can meet the requirement of acoustic design. However, in the semi-in-ear or open audio products, the small-caliber speaker designed in the conventional manner is difficult to achieve good high-frequency and low-frequency acoustic effects.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a dual magnetic circuit speaker.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a dual magnetic circuit loudspeaker comprises a basin frame, a first sound film component arranged on one side of the basin frame, a first magnetic circuit component interacted with the first sound film component, a second sound film component arranged on the other side of the basin frame, and a second magnetic circuit component interacted with the second sound film component; the effective vibration area of the first sound film assembly is more than 3/4 of the effective vibration area of the second sound film assembly; and a limiting structure is arranged in the vibration direction of the first voice diaphragm component.

The further technical scheme is as follows: the first voice film component comprises a first composite vibrating film and a first voice coil fixed on one side of the first composite vibrating film; the outer side of the first voice coil is provided with an elastic wave for limiting the vibration of the first composite diaphragm within a set range; the elastic wave is the limit structure.

The further technical scheme is as follows: the first magnetic circuit component comprises a first magnet fixed in the basin frame; the edge of the first composite diaphragm is fixed with the basin frame, and the first voice coil extends to the magnetic field of the first magnet, so that when the first voice coil passes through a signal, the first voice coil moves under the action of the magnetic field of the first magnet.

The further technical scheme is as follows: a first sound cavity is formed among the first magnet, the second magnetic circuit component and the first composite diaphragm; the first voice coil extends into the first sound cavity.

The further technical scheme is as follows: the second voice film component comprises a second composite vibrating film and a second voice coil arranged on one side of the second composite vibrating film; the edge of the second composite diaphragm is fixed with the basin frame.

The further technical scheme is as follows: the second magnetic circuit assembly comprises a magnet yoke fixed in the basin stand, a second magnet and a third magnet fixed in the magnet yoke; a second sound cavity is formed among the second magnet, the third magnet and the second composite diaphragm, and the second voice coil extends to the second sound cavity;

or the second magnetic circuit component comprises a magnetic yoke fixed in the basin frame and a second magnet fixed in the magnetic yoke; a second sound cavity is formed among the magnetic yoke, the second magnet and the second composite diaphragm, and the second voice coil extends to the second sound cavity;

or the second magnetic circuit assembly comprises a magnetic yoke fixed in the basin frame and a third magnet fixed in the magnetic yoke; a second sound cavity is formed among the magnetic yoke, the third magnet and the second composite diaphragm, and the second voice coil extends to the second sound cavity.

The further technical scheme is as follows: the first sound cavity and the second sound cavity are mutually isolated.

The further technical scheme is as follows: the basin frame is provided with a first through hole communicated with the first sound cavity; or/and the basin frame is provided with a second through hole communicated with the second sound cavity.

The further technical scheme is as follows: the magnetic yoke is fixed in the basin frame and used for isolating the first sound cavity from the second sound cavity; the magnetic yoke, the first magnet and the first composite diaphragm form the first sound cavity.

The further technical scheme is as follows: the interior of the basin stand is of a ladder structure, and two sides of the basin stand are of opening structures; the first composite vibrating diaphragm and the second composite vibrating diaphragm are respectively fixed on the opening structures at two sides; the first magnet and the magnetic yoke are fixed on the stepped structure.

Compared with the prior art, the utility model beneficial effect be: the first voice coil and the second voice coil of the utility model work under a larger magnetic field, so that the first composite vibrating diaphragm and the second composite vibrating diaphragm have larger kinetic energy; in addition, the first composite diaphragm moves under the action of the limiting structure, so that a good low-frequency effect is embodied; the first composite diaphragm and the second composite diaphragm have the same area, so that the loudspeaker works under the symmetrical and stable condition; therefore, the frequency response of the whole loudspeaker is wide, the sensitivity is high, and the total harmonic distortion is small.

The foregoing is a summary of the present invention, and other objects, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments, which is provided for the purpose of illustration and understanding of the present invention.

Drawings

Fig. 1 is a three-dimensional structure diagram of a dual magnetic circuit speaker of the present invention;

fig. 2 is a perspective structural view of another view angle of the dual magnetic circuit speaker of the present invention;

fig. 3 is an exploded view of a dual magnetic circuit speaker according to the present invention;

fig. 4 is a middle cross-sectional view of the dual magnetic circuit speaker of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and the following 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 those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "secured" are to be construed broadly and can, for example, be connected or detachably connected or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.

Fig. 1 to 4 are drawings of the present invention.

The present embodiment provides a dual magnetic circuit speaker, please refer to fig. 1 to 4, which includes a frame 10, a first voice diaphragm assembly 20 disposed on one side of the frame 10, a first magnetic circuit assembly 30 interacting with the first voice diaphragm assembly 20, a second voice diaphragm assembly 40 disposed on the other side of the frame 10, and a second magnetic circuit assembly 50 interacting with the second voice diaphragm assembly 40. The effective vibration area of the first diaphragm assembly 20 is 3/4 to 1 of the effective vibration area of the second diaphragm assembly 40, and preferably, the effective vibration area of the first diaphragm assembly 20 and the effective vibration area of the second diaphragm assembly 40 are the same or nearly the same. A limiting structure is arranged in the vibration direction of the first voice diaphragm assembly 20. Because the first diaphragm assembly 20 has a limiting structure, the first diaphragm assembly 20 can vibrate in a set range, that is, the vibration amplitude of the first diaphragm assembly 20 is limited, and the amplitude is prevented from being too large.

Because the vibration amplitude of the first diaphragm assembly 20 is affected by the limiting structure, the low frequency recovery can be improved, and in addition to the structural characteristics of the first diaphragm assembly 20, the first diaphragm assembly 20 can be used as a low-frequency vibration source. The vibration of the second diaphragm assembly 40 is not limited, and the amplitude of the vibration is generated according to the received signal, so that the second diaphragm assembly 40 serves as a full-frequency vibration source. And because the vibration areas of the first sound film assembly 20 and the second sound film assembly 40 are the same, the first magnetic circuit assembly 30 and the second magnetic circuit assembly 50 form a superposition effect of double magnetic circuits under the action of the first magnetic circuit assembly 30 and the first magnetic circuit assembly 30, and when the same signal source is received, the first sound film assembly 20 and the second sound film assembly 40 arranged at the two sides of the frame 10 move towards opposite directions, so that the forces applied to the loudspeaker are mutually counteracted, the loudspeaker has stable symmetrical vibration, the total harmonic distortion is reduced, meanwhile, the electric coupling factor BL value is increased, the corresponding sensitivity is also increased, and high-level high-frequency and low-frequency acoustic effects are realized.

Specifically, the first voice diaphragm assembly 20 includes a first composite diaphragm 21, and a first voice coil 22 fixed on one side of the first composite diaphragm 21. An elastic wave 23 for limiting the vibration of the first composite diaphragm 21 within a set range is arranged outside the first voice coil 22. The damper 23 is the above-described limit structure. The damper 23 has a spring-like effect, and when the vibration amplitude of the first composite diaphragm 21 is too large, the damper 23 exerts a protective effect to suppress the vibration amplitude of the first composite diaphragm 21. When the first voice coil 22 passes through a signal, under the action of the magnetic field of the first magnetic circuit assembly 30, the first voice coil 22 drives the first composite diaphragm 21 to vibrate, so as to generate a sound. The vibration condition of the first composite diaphragm 21 is determined according to the signal intensity in the first voice coil 22, and it should be noted that when the motion amplitude of the first composite diaphragm 21 is too large, the first composite diaphragm is inhibited by the elastic wave 23.

Preferably, one end of the damper 23 is fixedly connected with the outer side of the first voice coil 22, and the other end is fixedly connected with the basin stand 10.

The first magnetic circuit assembly 30 includes a first magnet 31 fixed within the frame 10. The edge of the first composite diaphragm 21 is fixed to the frame 10, and the first voice coil 22 extends to the magnetic field of the first magnet 31, so that when the first voice coil 22 passes through a signal, the first voice coil 22 is moved by the magnetic field of the first magnet 31.

Specifically, the first magnet 31 is a magnet, and may be another magnetic body.

Preferably, because the first magnet 31 and the second magnetic circuit assembly 50 are arranged close to each other and act together to generate a magnetic field, and the value of the force-electric coupling factor BL is greater than that of the single first magnet 31 or the single second magnetic circuit assembly 50, the first voice coil 22 moves under the action of the magnetic field, the vibration amplitude is extremely easy to be too large, and the damper 23 can play a role in suppression at this time.

A first sound cavity 24 is formed among the first magnet 31, the second magnetic circuit assembly 50 and the first composite diaphragm 21. The first voice coil 22 extends into the first acoustic chamber 24 and is suspended within the first acoustic chamber 24. Wherein, because the vibration of the first composite diaphragm 21 can affect the air flow in the first sound cavity 24, the basin stand 10 is provided with a first through hole 11 communicated with the first sound cavity 24. The gas in the first sound cavity 24 is ventilated through the first through hole 11 when the first composite diaphragm 21 vibrates, so that the first composite diaphragm 21 can vibrate smoothly.

Preferably, a damping cloth is disposed on the first through hole 11, and the air flow of the first sound chamber 24 is adjusted by the damping cloth.

Specifically, the edge of the first composite diaphragm 21 is fixed to the edge of the frame 10, as if covering the frame 10. The first composite diaphragm 21 is of a wavy structure, the first voice coil 22 is fixedly connected with the 'trough' of the first composite diaphragm 21 facing the interior of the basin frame 10, and the other end is in a suspended state and extends into the magnetic field formed by the second magnetic circuit assembly 50 and the first magnet 31.

The second voice diaphragm assembly 40 includes a second composite diaphragm 41, and a second voice coil 42 disposed on one side of the second composite diaphragm 41. The edge of the second composite diaphragm 41 is fixed to the frame 10. Specifically, one end of the second voice coil 42 is fixed to a side of the second composite diaphragm 41, preferably, the second composite diaphragm 41 is in a wavy structure, the other end of the second voice coil 42 is fixedly connected to a "trough" of the second composite diaphragm 41 facing the inside of the basin frame 10, and is in a suspended state, and the suspended end extends into the second magnetic circuit assembly 50.

The second magnetic circuit assembly 50 includes a yoke 51 fixed in the frame 10, and second and

third magnets

52 and 53 fixed in the yoke 51. A second sound cavity 54 is formed among the second magnet 52, the third magnet 53 and the second composite diaphragm 41, and the second voice coil 42 extends to the second sound cavity 54.

The yoke 51 is used for installation, the second magnet 52 and the third magnet 53 are fixed behind the yoke 51, and the yoke 51 is fixed on the basin stand 10. In a preferred embodiment, the yoke 51 has a bowl-shaped structure, the second magnet 52 is fixed to an inner wall of the yoke 51, the third magnet 53 is fixed to a middle position of the yoke 51, and a gap is formed between the second magnet 52 and the third magnet 53, into which the second voice coil 42 extends. Note that the gap is a part of the second acoustic chamber 54. Of course, the yoke 51 has a function of magnetic conduction in addition to a function of mounting, so that the magnetic field intensity is increased.

The second magnet 52 and the third magnet 53 may be magnets, or may be other magnetic bodies.

Similarly, since the vibration of the second composite diaphragm 41 affects the flow of air in the second sound chamber 54, the second through hole 13 communicating with the second sound chamber 54 is provided in the frame 10. The gas in the second sound cavity 54 is ventilated through the second through hole 13 when the second composite diaphragm 41 vibrates, so that the first composite diaphragm 21 can vibrate smoothly.

It is also preferred that a damping cloth is arranged on the second through-opening 13, by means of which the air flow of the second sound chamber 54 is regulated.

Preferably, the first through hole 11 and the second through hole 13 are uniformly distributed on the frame 10, so that the speaker has balance.

Wherein the first cavity 24 and the second cavity 54 are isolated from each other. The yoke 51 divides the frame 10 into two spaces, one of which forms a first sound cavity 24 with the first composite diaphragm 21 and the frame 10, and the other of which forms a second sound cavity 54 with the second composite diaphragm 41 and the frame 10.

The interior of the basin stand 10 is in a ladder structure, and the two sides of the basin stand are in an opening structure. The first composite diaphragm 21 and the second composite diaphragm 41 are fixed to the opening structures on both sides, respectively. The first magnet 31 and the yoke 51 are fixed to the stepped structure. Specifically, the frame 10 is provided with a flange inside, and the yoke 51 is fixed on the flange and is connected in a sealing manner. The bowl-shaped frame 10 has an opening side facing the second composite diaphragm 41, so that the second magnet 52 and the third magnet 53 can interact with the second voice coil 42. The whole magnetic yoke 51 is located in the frame 10, and the outer side of the bowl-shaped magnetic yoke 51, the first composite diaphragm 21 and the inner wall of the frame 10 form the first sound cavity 24.

Preferably, the first magnet 31, the second magnet 52 and the third magnet 53 are matched with the corresponding first washer 32, the second washer 55 and the third washer 56, so that the uniformity of the magnetic field is increased.

Specifically, the magnetic field in which the first voice coil 22 is located is referred to as a first magnetic field, and the magnetic field in which the second voice coil 42 is located is referred to as a second magnetic field. The first magnet 31, the second magnet 52 and the third magnet 53 are arranged at relatively close positions, so that magnetic fields can be formed in pairs and are mutually superposed, the total harmonic distortion of the loudspeaker is reduced, meanwhile, the electric coupling factor BL is increased, and the corresponding sensitivity is also increased.

In other embodiments, the second magnetic circuit assembly 50 comprises a yoke 51 fixed in the frame 10, and a third magnet 53 fixed in the yoke 51. A second sound cavity 54 is formed among the yoke 51, the third magnet 53 and the second composite diaphragm 41, and the second voice coil 42 extends into the second sound cavity 54. In the present embodiment, the third magnet 53 increases the magnetic field intensity through the yoke 51, and the gap between the first magnet 31 and the yoke 51 is a part of the first sound cavity 24, and the first voice coil 22 performs a magnetic cutting field movement in the gap. The third magnet 53 is disposed in the middle of the yoke 51 such that a gap is formed between the yoke 51 and the third magnet 53, the gap being a part of the second sound chamber 54, and the gap being formed with a superimposed magnetic field, and the second voice coil 42 making a cutting magnetic field movement in the gap. This embodiment reduce cost, improve the convenience of processing.

In other embodiments, the second magnetic circuit assembly 50 includes a yoke 51 fixed in the frame 10, and a second magnet 52 fixed in the yoke 51. A second sound cavity 54 is formed among the yoke 51, the second magnet 52 and the second composite diaphragm 41, and the second voice coil 42 extends into the second sound cavity 54. The second magnet 52 is fixed to the yoke 51, and the yoke 51 can reinforce the magnetic flux of the second magnet 52. Wherein, the gap between the first magnet 31 and the yoke 51 is a part of the first sound cavity 24, and the first voice coil 22 performs a cutting magnetic field movement in the gap; the second magnet 52 has a space formed therein, and the first magnet 31 and the second magnet 52 have a superimposed magnetic field formed therein, and the second voice coil 42 performs a cutting magnetic field movement in the space. The embodiment reduces the cost and improves the processing convenience.

In other embodiments, the second voice coil 42 of the second voice coil assembly 40 receives a larger elastic force under the superimposed magnetic field, so a limit structure, i.e. a damper, is disposed outside the second voice coil 42. The outer side of the second voice coil 42 is provided with elastic waves, one end of the elastic waves generating elasticity is fixed with the second voice coil 42, and the other end is fixed with the basin stand 10. The elastic coefficient of the damper of the present embodiment is selected according to actual requirements, and in general, the equivalent compliance meeting the requirements is designed according to the requirements of the material, shape, size of the supporting area, hardness, and the like of the damper, so as to meet the requirement of using the second voice coil 42 in the speaker. In addition, the spring rate of the spring outside the second voice coil 42 is much smaller than the spring rate of the spring outside the first voice coil 22.

Compared with the prior art, the first voice coil 22 and the second voice coil 42 of the present invention work under a relatively large magnetic field, so that the first composite diaphragm 21 and the second composite diaphragm 41 have relatively large kinetic energy; in addition, the first composite diaphragm 21 moves under the action of the limiting structure, so that a better low-frequency effect is embodied; the first composite diaphragm 21 and the second composite diaphragm 41 have the same area, so that the loudspeaker works under a symmetrical and stable condition; therefore, the frequency response of the whole loudspeaker is wide, the sensitivity is high, and the total harmonic distortion is small.

The technical content of the present invention is further described by the embodiments only, so that the reader can understand it more easily, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation according to the present invention is protected by the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A double-magnetic circuit loudspeaker is characterized by comprising a basin frame, a first sound film component arranged on one side of the basin frame, a first magnetic circuit component interacted with the first sound film component, a second sound film component arranged on the other side of the basin frame, and a second magnetic circuit component interacted with the second sound film component; the effective vibration area of the first sound film assembly is more than 3/4 of the effective vibration area of the second sound film assembly; and a limiting structure is arranged in the vibration direction of the first voice diaphragm component.

2. A dual magnetic circuit speaker as claimed in claim 1, wherein the first voice film assembly includes a first composite diaphragm, a first voice coil fixed to one side of the first composite diaphragm; the outer side of the first voice coil is provided with an elastic wave for limiting the vibration of the first composite diaphragm within a set range; the elastic wave is the limit structure.

3. A dual magnetic circuit speaker as claimed in claim 2, wherein the first magnetic circuit assembly includes a first magnet fixed within the frame; the edge of the first composite diaphragm is fixed with the basin frame, and the first voice coil extends to the magnetic field of the first magnet, so that the first voice coil moves under the action of the magnetic field of the first magnet when passing through a signal.

4. A dual magnetic circuit speaker as claimed in claim 3, wherein a first acoustic cavity is formed between the first magnet and the second magnetic circuit assembly and between the first composite diaphragm; the first voice coil extends into the first sound cavity.

5. A dual magnetic circuit speaker as claimed in claim 4, wherein the second voice coil assembly includes a second composite diaphragm, a second voice coil disposed at one side of the second composite diaphragm; the edge of the second composite diaphragm is fixed with the basin frame.

6. A dual magnetic circuit speaker as claimed in claim 5, wherein the second magnetic circuit assembly comprises a yoke fixed in the frame, a second magnet and a third magnet fixed in the yoke; a second sound cavity is formed among the second magnet, the third magnet and the second composite diaphragm, and the second voice coil extends to the second sound cavity;

or the like, or, alternatively,

the second magnetic circuit assembly comprises a magnet yoke fixed in the basin frame and a second magnet fixed in the magnet yoke; a second sound cavity is formed among the magnetic yoke, the second magnet and the second composite diaphragm, and the second voice coil extends to the second sound cavity;

or the like, or, alternatively,

the second magnetic circuit assembly comprises a magnet yoke fixed in the basin frame and a third magnet fixed in the magnet yoke; a second sound cavity is formed among the magnetic yoke, the third magnet and the second composite diaphragm, and the second voice coil extends to the second sound cavity.

7. A dual magnetic circuit speaker as claimed in claim 6, wherein the first and second acoustic chambers are isolated from each other.

8. A dual magnetic circuit speaker as claimed in claim 6, wherein the frame is provided with a first through hole communicating with the first acoustic chamber; or/and the basin frame is provided with a second through hole communicated with the second sound cavity.

9. A dual magnetic circuit speaker according to claim 6, wherein the magnetic yoke is fixed inside the frame and used for isolating the first and second sound cavities; the magnetic yoke, the first magnet and the first composite diaphragm form the first sound cavity.

10. A dual magnetic circuit speaker as claimed in claim 6, wherein the frame has a stepped structure inside and open structures at both sides; the first composite vibrating diaphragm and the second composite vibrating diaphragm are respectively fixed on the opening structures at two sides; the first magnet and the magnetic yoke are fixed on the ladder structure.