CN219740553U - Horn structure - Google Patents

Abstract

The utility model discloses a loudspeaker structure, which comprises a shell, and a magnetic circuit system and a vibration system which are arranged in the shell, wherein the magnetic circuit system comprises a first magnetic circuit unit and a second magnetic circuit unit, the first magnetic circuit unit is provided with a first magnetic gap, and the second magnetic circuit unit is provided with a second magnetic gap; the vibration system comprises a planar vibrating diaphragm, a first voice coil and a second voice coil; the first voice coil is cylindrical, one end of the first voice coil is fixed in the middle of the planar vibrating diaphragm, and the other end of the first voice coil extends into the first magnetic gap; the second voice coil is in a planar ring shape, is arranged on the planar vibrating diaphragm and surrounds the first voice coil, and is arranged right above the second magnetic gap; or the first voice coil is in a plane ring shape and is arranged in the middle of the plane vibrating diaphragm, and the first voice coil is arranged right above the first magnetic gap; the second voice coil is in a cylinder shape, one end of the second voice coil is fixed on the planar vibrating diaphragm, and the other end of the second voice coil stretches into the second magnetic gap and surrounds the first voice coil. The loudspeaker structure can better reduce the dividing movement of the vibrating diaphragm and increase the sound pressure.

Description

Horn structure

Technical Field

The utility model relates to the technical field of sound equipment, in particular to a loudspeaker structure.

Background

Along with the progress of the living standard of people, the requirements of the living on audio-visual digital products such as notebook computers are higher and higher, and the loudspeaker is used as a necessary accessory on audio-visual electronic products such as notebook computers, so that the sound pressure problem is always a bottleneck for limiting the performance and portability of the products.

The moving coil loudspeaker in the related art generally includes a diaphragm, a voice coil, and a magnet. The voice coil is connected to the inner ring portion of the diaphragm and is positioned in the gap of the magnet. When a current signal passes through the voice coil, the voice coil generates a magnetic field and pushes the diaphragm to vibrate due to attraction or repulsion generated by interaction of the magnetic field of the permanent magnet.

Since the voice coil of the moving coil loudspeaker in the related art is attached to a portion below the diaphragm, when a current signal interacts with a magnetic field of the permanent magnet through a magnetic field generated by the voice coil, vibration is generated by driving of the diaphragm to the voice coil, and the vibration is diffused in a water ripple-like manner from a position where the diaphragm is connected to the voice coil. This phenomenon is called split vibration because of the time and position differences in the diffusion of the vibration. The split vibration may cause the vibration of the diaphragm to be uneven. In addition, when the pushing force generated by interaction is insufficient, the vibration of the vibrating diaphragm is reduced, and the sound pressure of a specific frequency is reduced.

Disclosure of Invention

The utility model aims to provide an improved loudspeaker structure.

The technical scheme adopted for solving the technical problems is as follows: the loudspeaker structure comprises a shell, and a magnetic circuit system and a vibration system which are arranged in the shell, wherein the magnetic circuit system comprises at least one first magnetic circuit unit and at least one second magnetic circuit unit, the first magnetic circuit unit is provided with an annular first magnetic gap, and the second magnetic circuit unit is provided with an annular second magnetic gap;

the vibration system comprises a planar vibrating diaphragm, at least one first voice coil and at least one second voice coil; the planar vibrating diaphragm is erected on the shell through an edge part, the at least one first voice coil is cylindrical, one end of the at least one first voice coil is fixed in the middle of the planar vibrating diaphragm, and the other end of the at least one first voice coil stretches into the first magnetic gap; the at least one second voice coil is in a planar ring shape, is arranged on the planar vibrating diaphragm and surrounds the at least one first voice coil, and is arranged right above the second magnetic gap;

or (b)

The at least one first voice coil is in a planar ring shape and is arranged in the middle of the planar vibrating diaphragm, and the at least one first voice coil is arranged right above the first magnetic gap; the at least one second voice coil is cylindrical, one end of the at least one second voice coil is fixed on the planar vibrating diaphragm, and the other end of the at least one second voice coil stretches into the second magnetic gap and surrounds the at least one first voice coil.

Preferably, in the horn structure of the present utility model, the first magnetic circuit unit includes a middle magnet and a plurality of first magnets surrounding the outer side of the middle magnet; a first magnetic gap is formed between the intermediate magnet and the plurality of first magnets.

Preferably, in the horn structure of the present utility model, the second magnetic circuit unit includes a plurality of first magnets and a plurality of second magnets enclosed outside the plurality of first magnets; a second magnetic gap is formed between the plurality of second magnets and the plurality of first magnets.

Preferably, in the horn structure of the present utility model, the intermediate magnet is a washer or a magnet, and the intermediate magnet is a racetrack.

Preferably, in the horn structure of the present utility model, the first voice coil is disposed perpendicular to magnetic lines of force of the first magnetic gap.

Preferably, in the horn structure of the present utility model, the second voice coil is disposed parallel to magnetic lines of force directly above the second magnetic gap.

Preferably, in the loudspeaker structure of the present utility model, a cross section of the first voice coil is a racetrack.

Preferably, in the loudspeaker structure of the present utility model, the second voice coil is a racetrack.

Preferably, in the loudspeaker structure of the present utility model, the one end of the at least one first voice coil is fixed to the middle part of the planar diaphragm, and the other end of the at least one first voice coil extends into the first magnetic gap.

Preferably, in the horn structure of the present utility model, the at least one second voice coil surrounds the at least one first voice coil.

By implementing the utility model, the following beneficial effects are achieved:

the utility model is composed of at least two magnetic circuit units and at least two voice coil structures, the second voice coil is planar, the dividing movement of the vibrating diaphragm can be reduced better, and the sound pressure can be increased.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic perspective view of a horn structure according to an embodiment of the present utility model;

FIG. 2 is a schematic perspective view of the magnetic circuit of the horn structure shown in FIG. 1;

FIG. 3 is a schematic perspective view of a vibration system of the horn structure of FIG. 1;

FIG. 4 is a schematic perspective cross-sectional view of the horn structure of FIG. 1;

FIG. 5 is an exploded schematic view of the horn structure of FIG. 1;

FIG. 6 is a schematic cross-sectional view of a horn structure according to a second embodiment of the present utility model;

FIG. 7 is an exploded schematic view of the horn structure of FIG. 6;

FIG. 8 is a schematic view of a horn structure in a third embodiment of the present utility model;

FIG. 9 is a schematic cross-sectional view of the horn structure of FIG. 8 in accordance with the present utility model;

FIG. 10 is an exploded schematic view of the horn structure of FIG. 8 of the present utility model;

fig. 11 is a schematic cross-sectional view of a horn structure in a fourth embodiment of the present utility model.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or chemically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.

Embodiment one:

as shown in fig. 1, an embodiment of the present utility model discloses a horn structure, which includes a housing 1, a magnetic circuit system and a vibration system disposed in the housing 1, wherein the magnetic circuit system is used for generating a magnetic field with a specific distribution, and the vibration system generates induction force in the magnetic field and vibration, thereby generating sound.

Referring together to fig. 2, the magnetic circuit may in some embodiments comprise at least one first magnetic circuit unit 2 and at least one second magnetic circuit unit 3, the first magnetic circuit unit 2 having an annular first magnetic gap 21 and the second magnetic circuit unit 3 having an annular second magnetic gap 31.

Referring also to fig. 3, the vibration system may in some embodiments include a planar diaphragm 4, at least one first voice coil 5, and at least one second voice coil 6. The planar diaphragm 4 is mounted on the housing 1 with an edge portion for generating vibrations. The at least one first voice coil 5 has a cylindrical shape, one end of which is fixed to the middle of the planar diaphragm 4, and the other end of which extends into the first magnetic gap 21, so that an inductive force can be generated in the magnetic field. The at least one second voice coil 6 is in a planar ring shape, is arranged on the planar diaphragm 4 and surrounds the at least one first voice coil 5, and the at least one second voice coil 6 is arranged right above the second magnetic gap 31, so that induction force can be generated in a magnetic field.

Specifically:

as shown in fig. 2 and 4, the first magnetic circuit unit 2 may include a middle magnet 22 and a plurality of first magnets 23 surrounding the middle magnet 22 for generating a magnetic field in some embodiments. An annular first magnetic gap 21 is formed between the intermediate magnet 22 and the first magnet 23. Preferably, the intermediate magnet 22 is a washer or a magnet, and the intermediate magnet 22 is arranged in a racetrack. The number of the first magnets 23 is 4, and a first magnetic gap 21 is formed between the intermediate magnet 22 and the 4 first magnets 23, and the first magnetic gap 21 is also in a racetrack shape. The two first magnets 23 located on opposite sides of the intermediate magnet 22 are parallel to each other and are identical in size.

Further, the second magnetic circuit unit 3 may in some embodiments comprise a plurality of first magnets 23 and a plurality of second magnets 32 surrounding the plurality of first magnets 23 for generating a further magnetic field. The plurality of second magnets 32 and the plurality of first magnets 23 form an annular second magnetic gap 31 therebetween. It can be appreciated that in some embodiments, the number of the second magnets 32 is equal to that of the first magnets 23, and is 4, the 4 second magnets 32 are enclosed outside the 4 first magnets 23, and the second magnets 32 are arranged in parallel with the first magnets 23 in a one-to-one correspondence, and the sizes of the corresponding first magnets 23 and second magnets 32 are equal.

As shown in fig. 4, the first voice coil 5 may be disposed perpendicular to the magnetic lines of force of the first magnetic gap 21 in some embodiments. The second voice coil 6 is disposed parallel to the magnetic lines of force of the second magnetic gap 31.

As shown in fig. 3, the first voice coil 5 may be cylindrical in some embodiments, and the cross section of the first voice coil 5 is a racetrack. The second voice coil 6 may be a planar structure in some embodiments, the second voice coil 6 being racetrack-shaped. A gap is provided between the first voice coil 5 and the second voice coil 6. It will be appreciated that in some embodiments, the shape of the first voice coil 5, the second voice coil 6, and the intermediate magnet 22 may also be circular, rectangular, etc. At least one second voice coil 6 surrounds at least one first voice coil 5.

As shown in fig. 4, in some embodiments, one end of at least one first voice coil 5 is fixed to the middle portion of the planar diaphragm 4, and the other end of at least one first voice coil 5 extends into the first magnetic gap 21.

As shown in fig. 5, the housing 1 of the horn structure may include a bottom case 11 and a frame 12 in some embodiments, the magnetic circuit system is mounted on the bottom case 11, and the bottom case 11 is connected to the planar diaphragm 4 through the frame 12. Preferably, the frame 12 has a certain thickness, and the bottom case 11 is a flat plate 12.

Embodiment two:

as shown in fig. 6, the second embodiment of the present utility model discloses a speaker structure, which includes a housing 1a, a magnetic circuit system and a vibration system disposed in the housing 1a, wherein the magnetic circuit system is used for generating a magnetic field with a specific distribution, and the vibration system generates an inductive force in the magnetic field and generates vibration so as to generate sound.

Referring to fig. 7 together, the magnetic circuit may in some embodiments comprise at least one first magnetic circuit unit 2a and at least one second magnetic circuit unit 3a, the first magnetic circuit unit 2a having a first magnetic gap 21a in the shape of a ring and the second magnetic circuit unit 3a having a second magnetic gap 31a in the shape of a ring.

The vibration system may in some embodiments comprise a planar diaphragm 4a, at least one first voice coil 5a and at least one second voice coil 6a. At least one first voice coil 5a is in a planar ring shape and is arranged in the middle of the planar diaphragm 4a, and at least one first voice coil 5a is arranged right above the first magnetic gap 21 a; at least one second voice coil 6a has a cylindrical shape, one end of which is fixed to the planar diaphragm 4a, and the other end of which extends into the second magnetic gap 31a and surrounds the at least one first voice coil 5a.

Specifically:

as shown in fig. 6 and 7, the first magnetic circuit unit 2a may include a middle magnet 22a and a plurality of first magnets 23a surrounding the middle magnet 22a for generating a magnetic field in some embodiments. A first magnetic gap 21a of annular shape is formed between the intermediate magnet 22a and the first magnet 23 a. Preferably, the intermediate magnet 22a is a washer or a magnet, and the intermediate magnet 22a is arranged in a racetrack. The number of the first magnets 23a is 4, and a first magnetic gap 21a is formed between the intermediate magnet 22a and the 4 first magnets 23a, and the first magnetic gap 21a is also in a racetrack shape. The two first magnets 23a located on opposite sides of the intermediate magnet 22a are parallel to each other and are identical in size.

Further, the second magnetic circuit unit 3a may include a plurality of first magnets 23a and a plurality of second magnets 32a surrounding the plurality of first magnets 23a for generating another magnetic field in some embodiments. The plurality of second magnets 32a and the plurality of first magnets 23a form a second magnetic gap 31a therebetween in a ring shape. It can be appreciated that in some embodiments, the number of the second magnets 32a is equal to the number of the first magnets 23a, and is 4, the 4 second magnets 32a are enclosed outside the 4 first magnets 23a, and the second magnets 32a are disposed in parallel with the first magnets 23a in a one-to-one correspondence, and the sizes of the corresponding first magnets 23a and second magnets 32a are equal. Preferably, in some embodiments, the second magnet 32a is integrally formed with the bottom case 11a, the second magnet 32a is punched on the bottom case 11a, the second magnet 32a is L-shaped, and the second magnet 32a is washer.

As shown in fig. 7, the first voice coil 5a may be a planar structure in some embodiments, and the cross section of the first voice coil 5a is of a racetrack type. The second voice coil 6a may be cylindrical in some embodiments, with the second voice coil 6a being racetrack. A gap is provided between the first voice coil 5a and the second voice coil 6a. It will be appreciated that in some embodiments, the shape of the first voice coil 5a, the second voice coil 6a, and the intermediate magnet 22a may also be circular, rectangular, etc. At least one second voice coil 6a surrounds at least one first voice coil 5a.

As shown in fig. 6, the housing 1a of the horn structure may include a bottom case 11a, and a frame 12a, the magnetic circuit system is mounted on the bottom case 11a, the bottom case 11a is connected with the planar diaphragm 4a through the frame 12a, the frame 12a has a certain thickness, and the bottom case 11a is in a flat plate shape. Preferably, the second magnet 32a is integrally formed with the bottom case 11a, the second magnet 32a is punched on the bottom case 11a, and a through hole is formed in the second magnet 32 a.

It should be noted that, except for the above-mentioned structure in this embodiment, which is different from the first embodiment, other structures in this embodiment are the same as the first embodiment, and are not described here again.

Embodiment III:

as shown in fig. 8, a third embodiment of the present utility model discloses a horn structure, which includes a housing 1b, and a magnetic circuit system and a vibration system disposed in the housing 1b, wherein the magnetic circuit system is used for generating a magnetic field with a specific distribution, and the vibration system generates an inductive force in the magnetic field and vibrates to generate sound.

Referring to fig. 9 together, the magnetic circuit may in some embodiments comprise at least one first magnetic circuit unit 2b and at least one second magnetic circuit unit 3b, the first magnetic circuit unit 2b having a first magnetic gap 21b in the shape of a ring and the second magnetic circuit unit 3b having a second magnetic gap 31b in the shape of a ring.

Referring to fig. 9 and 10 together, the vibration system may in some embodiments include a planar diaphragm 4b, at least one first voice coil 5b, and at least one second voice coil 6b. At least one first voice coil 5b is in a planar ring shape and is arranged in the middle of the planar diaphragm 4b, and at least one first voice coil 5b is arranged right above the first magnetic gap 21 b; at least one second voice coil 6b has a cylindrical shape, one end of which is fixed to the planar diaphragm 4b, and the other end of which extends into the second magnetic gap 31b and surrounds the at least one first voice coil 5b.

Specifically:

as shown in fig. 9 and 10, the first magnetic circuit unit 2b may include a middle magnet 22b and a plurality of first magnets 23b surrounding the middle magnet 22b for generating a magnetic field in some embodiments. The intermediate magnet 22b and the plurality of first magnets form a first magnetic gap 21b in a ring shape therebetween. Preferably, the intermediate magnet 22b is a washer or a magnet, and the intermediate magnet 22b is circular. The first magnet 23b may include a plurality of sector magnets or may be 1 magnet having a ring shape as a whole.

Further, the second magnetic circuit unit 3b may include a plurality of first magnets 23b and a plurality of second magnets 32b surrounding the plurality of first magnets 23b for generating another magnetic field in some embodiments. The plurality of second magnets 32b and the plurality of first magnets 23b form a second magnetic gap 31b therebetween in a ring shape. It will be appreciated that in some embodiments, the second magnets 32b are disposed around the plurality of first magnets 23b, and the second magnets 32b are disposed in parallel with the first magnets 23b in a one-to-one correspondence, and a washer for magnetic conduction is further disposed on the second magnets 32 b. The first magnet 23b may include a plurality of sector magnets, or may be 1 magnet having a ring shape as a whole, and the second magnet 32b has a diameter larger than that of the first magnet 23 b.

As shown in fig. 11, the first voice coil 5b may be a planar structure in some embodiments, and the cross section of the first voice coil 5b is circular. The second voice coil 6b may be cylindrical in some embodiments, and the second voice coil 6b is annular. A gap is provided between the first voice coil 5b and the second voice coil 6b.

As shown in fig. 10, the shell 1b of the horn structure may include a bottom shell 11b and a frame 12b in some embodiments, the magnetic circuit system is mounted on the bottom shell 11b, the bottom shell 11b is connected with the planar diaphragm 4b through the frame 12b, the diameter of the frame 12b and the diameter of the planar diaphragm 4b are smaller than those of the bottom shell 11b, the bottom shell 11b is in a stepped cylindrical shape, and the planar diaphragm 4b and the frame 12b are disposed on a step inside the bottom shell 11 b.

It should be noted that, except for the above-mentioned structure in this embodiment, which is different from the first embodiment, other structures in this embodiment are the same as the first embodiment, and are not described here again.

Embodiment four:

as shown in fig. 11, a fourth embodiment of the present utility model discloses a horn structure, which includes a housing 1c, and a magnetic circuit system and a vibration system disposed in the housing 1c, wherein the magnetic circuit system is used for generating a magnetic field with a specific distribution, and the vibration system generates an inductive force in the magnetic field and vibrates to generate sound.

The magnetic circuit may in some embodiments comprise at least one first magnetic circuit unit 2c and at least one second magnetic circuit unit 3c, the first magnetic circuit unit 2c having an annular first magnetic gap 21c and the second magnetic circuit unit 3c having an annular second magnetic gap 31c;

the vibration system may in some embodiments comprise a planar diaphragm 4c, at least one first voice coil 5c and at least one second voice coil 6c; at least one first voice coil 5c is cylindrical, one end of the first voice coil is fixed in the middle of the planar diaphragm 4c, and the other end of the first voice coil extends into the first magnetic gap 21 c; the at least one second voice coil 6c is in a planar ring shape, is disposed on the planar diaphragm 4c and surrounds the at least one first voice coil 5c, and the at least one second voice coil 6c is disposed directly above the second magnetic gap 31c.

Specifically:

as shown in fig. 11, the first magnetic circuit unit 2c may include a middle magnet 22c and a plurality of first magnets 23c surrounding the middle magnet 22c for generating a magnetic field in some embodiments. The intermediate magnet 22c and the plurality of first magnets form a first magnetic gap 21c therebetween. Preferably, the intermediate magnet 22c is a washer or a magnet, and the intermediate magnet 22c is circular. The first magnet 23c may include a plurality of sector magnets or may be 1 magnet having a ring shape as a whole.

Further, the second magnetic circuit unit 3c may include a plurality of first magnets 23c and a plurality of second magnets 32c surrounding the plurality of first magnets 23c for generating another magnetic field in some embodiments. A second magnetic gap 31c is formed between the plurality of second magnets 32c and the plurality of first magnets 23 c. It is understood that the second magnets 32c are disposed around the plurality of first magnets 23c, and the second magnets 32c are disposed in parallel with the first magnets 23c in a one-to-one correspondence. The first magnet 23c may include a plurality of sector magnets, or may be 1 magnet having a ring shape as a whole, and the second magnet 32c has a diameter larger than that of the first magnet 23 c.

As shown in fig. 11, the first voice coil 5c may be cylindrical in some embodiments, and the cross section of the first voice coil 5c is circular. The second voice coil 6c may be a planar structure in some embodiments, and the second voice coil 6c is in a ring shape. A gap is provided between the first voice coil 5c and the second voice coil 6 c.

As shown in fig. 11, the casing 1c of the horn structure may include a bottom shell 11c and a frame 12c in some embodiments, the magnetic circuit system is mounted on the bottom shell 11c, the bottom shell 11c is connected with the planar diaphragm 4c through the frame 12c, the diameter of the frame 12c and the diameter of the planar diaphragm 4c are smaller than those of the bottom shell 11c, the bottom shell 11c is in a stepped cylindrical shape, and the planar diaphragm 4c and the frame 12c are disposed on a step inside the bottom shell 11 c.

It should be noted that, in addition to the above-mentioned structure and the third embodiment, the present embodiment is different from the third embodiment in other structures and the third embodiment, and is not described herein.

By implementing the utility model, the following beneficial effects are achieved:

the utility model is composed of at least two magnetic circuit units and at least two voice coil structures, the second voice coil is planar, the dividing movement of the vibrating diaphragm can be reduced better, and the sound pressure can be increased.

It is to be understood that the above examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model; it should be noted that, for a person skilled in the art, the above embodiments or technical features may be freely combined, and several variations and modifications may be made, without departing from the spirit of the utility model, which fall within the scope of the utility model, i.e. the embodiments described in "some embodiments" may be freely combined with any of the above and below embodiments; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (10)

1. A horn structure comprising a housing (1, 1a, 1b, 1 c) and a magnetic circuit and a vibration system arranged in the housing (1, 1a, 1b, 1 c), characterized in that the magnetic circuit comprises at least one first magnetic circuit unit (2, 2a, 2b, 2 c) and at least one second magnetic circuit unit (3, 3a, 3b, 3 c), the first magnetic circuit unit (2, 2a, 2b, 2 c) having a first magnetic gap (21, 21a, 21b, 21 c) of an annular shape, the second magnetic circuit unit (3, 3a, 3b, 3 c) having a second magnetic gap (31, 31a, 31b, 31 c) of an annular shape;

the vibration system comprises a planar diaphragm (4, 4a, 4b, 4 c), at least one first voice coil (5, 5a, 5b, 5 c) and at least one second voice coil (6, 6a, 6b, 6 c); the planar vibrating diaphragm (4, 4a, 4b, 4 c) is erected on the shell (1, 1a, 1b, 1 c) by an edge part, the at least one first voice coil (5, 5a, 5b, 5 c) is cylindrical, one end of the at least one first voice coil is fixed at the middle part of the planar vibrating diaphragm (4, 4a, 4b, 4 c), and the other end of the at least one first voice coil extends into the first magnetic gap (21, 21a, 21b, 21 c); the at least one second voice coil (6, 6a, 6b, 6 c) is in a planar ring shape, is arranged on the planar vibrating diaphragm (4, 4a, 4b, 4 c) and surrounds the at least one first voice coil (5, 5a, 5b, 5 c), and the at least one second voice coil (6, 6a, 6b, 6 c) is arranged right above the second magnetic gap (31, 31a, 31b, 31 c);

or (b)

The at least one first voice coil (5, 5a, 5b, 5 c) is in a planar ring shape and is arranged in the middle of the planar vibrating diaphragm (4, 4a, 4b, 4 c), and the at least one first voice coil (5, 5a, 5b, 5 c) is arranged right above the first magnetic gap (21, 21a, 21b, 21 c); the at least one second voice coil (6, 6a, 6b, 6 c) is cylindrical, one end of the second voice coil is fixed on the planar vibrating diaphragm (4, 4a, 4b, 4 c), and the other end of the second voice coil extends into the second magnetic gap (31, 31a, 31b, 31 c) and surrounds the at least one first voice coil (5, 5a, 5b, 5 c).

2. The horn structure according to claim 1, characterized in that the first magnetic circuit unit (2, 2a, 2b, 2 c) includes an intermediate magnet (22, 22a, 22b, 22 c) and a plurality of first magnets (23, 23a, 23b, 23 c) surrounding the intermediate magnet (22, 22a, 22b, 22 c); first magnetic gaps (21, 21a, 21b, 21 c) are formed between the intermediate magnets (22, 22a, 22b, 22 c) and the plurality of first magnets (23, 23a, 23b, 23 c).

3. The horn structure according to claim 2, characterized in that the second magnetic circuit unit (3, 3a, 3b, 3 c) includes a plurality of first magnets (23, 23a, 23b, 23 c) and a plurality of second magnets (32, 32a, 32b, 32 c) surrounding the plurality of first magnets (23, 23a, 23b, 23 c); a second magnetic gap (31, 31a, 31b, 31 c) is formed between the plurality of second magnets (32, 32a, 32b, 32 c) and the plurality of first magnets (23, 23a, 23b, 23c c).

4. The horn structure according to claim 2, characterized in that the intermediate magnets (22, 22a, 22b, 22 c) are washer or magnets, the intermediate magnets (22, 22a, 22b, 22 c) being racetrack-shaped.

5. The horn structure according to claim 1, characterized in that the first voice coil (5, 5a, 5b, 5 c) is arranged perpendicular to the magnetic field lines of the first magnetic gap (21, 21a, 21b, 21 c).

6. The horn structure according to claim 1, characterized in that the second voice coil (6, 6a, 6b, 6 c) is arranged parallel to the magnetic field lines directly above the second magnetic gap (31, 31a, 31b, 31 c).

7. A horn structure according to any one of claims 1-6, characterized in that the cross section of the first voice coil (5, 5a, 5b, 5 c) is racetrack.

8. A horn structure according to any one of claims 1-6, characterized in that the second voice coil (6, 6a, 6b, 6 c) is racetrack shaped.

9. The horn structure according to any one of claims 1-6, characterized in that said one end of said at least one first voice coil (5, 5a, 5b, 5 c) is fixed to a middle portion of said planar diaphragm (4, 4a, 4b, 4 c), said other end of said at least one first voice coil (5, 5a, 5b, 5 c) protruding into said first magnetic gap (21, 21a, 21b, 21 c).

10. The horn structure according to claim 9, characterized in that the at least one second voice coil (6, 6a, 6b, 6 c) surrounds the at least one first voice coil (5, 5a, 5b, 5 c).