CN210183541U

CN210183541U - Multi-sound-emitting unit combined structure

Info

Publication number: CN210183541U
Application number: CN201920744979.1U
Authority: CN
Inventors: Siyuan Chen; 陈思源
Original assignee: Chengdu Flant Technology Co Ltd
Current assignee: Chengdu Flant Technology Co Ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-03-24
Anticipated expiration: 2029-05-23

Abstract

The utility model relates to a multiple sound unit composite structure, which comprises a shell component, a piezoelectric loudspeaker and a sound-amplifying unit with the type different from that of the piezoelectric loudspeaker, wherein the shell component comprises a sound cavity shell, a cover shell and a supporting frame arranged between the sound cavity shell and the cover shell; the supporting rack is located the space of sound cavity structure, the supporting rack is formed with interior sunken column structure towards the terminal surface of sound cavity casing bottom, interior sunken column structure is the cylinder, constitute the rear end cavity of supporting rack, rear end cavity one end is the opening, the other end is porous structure's bottom, the periphery of bottom is equipped with the radial outside flange that extends along the rear end cavity, the flange is sunken towards the central part of a terminal surface of lid shell, form the front end cavity that supplies the piezoelectric loudspeaker to install, the center of front end cavity forms a cylinder, the middle part of flange is equipped with the flange fretwork part that is connected with the periphery of front end cavity, piezoelectric loudspeaker installs in the front end cavity. Through the arrangement, the tone quality effect of the earphone is more distinct.

Description

Multi-sound-emitting unit combined structure

Technical Field

The utility model relates to a many sound unit integrated configuration.

Background

With the increasing popularity of handheld entertainment devices and audio-visual audio products, earphones have become an integral part of people's life. New and higher requirements are continuously put on the sound quality performance of the earphone. Therefore, the earphone also has the sound quality effects of clear, close, bright, comfortable, wide and natural levels in the sound expression level under the conditions of comfortable wearing and delicate appearance.

Enjoying music with good tone quality is a mental enjoyment. The earphone is used as a sound producing device and is a playing device for connecting two ends (playing and recording) of music, so that the internal structure design of the earphone, the self characteristics and the physical limit of a sound producing unit directly influence the quality presentation of sound, and the body-cutting experience of a listener is influenced.

The structure of the earphones in the market at present usually adopts a single sound unit, taking a full frequency unit (moving coil) as an example, no matter how excellent the full frequency unit has, physical limits and electroacoustic performance upper limits must exist, for example, the frequency response range cannot be extended to 40kHz, so that the presentation of details cannot reach a new height, which forms a bottleneck in the technical development of the earphones.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a in view of the utility model who produces under this kind of background above, provide an electro-acoustic characteristic who utilizes each type sound producing unit, through integrating in the earphone, promote the many sound unit integrated configuration of listening effect.

One of the objectives of the present invention is to provide a multiple sound unit assembly structure, which includes a housing assembly, a piezoelectric speaker and other types of sound units different from the piezoelectric speaker, wherein the housing assembly includes a sound cavity housing, a cover housing and a support frame installed between the sound cavity housing and the cover housing, the interior of the sound cavity housing forms a sound cavity structure corresponding to the piezoelectric speaker and the other types of sound units, the sound cavity housing forms a hollow structure for communicating the sound cavity structure with an external environment, or the sound cavity housing forms the sound cavity structure and the external environment are sealed; the cover shell cover is arranged at a sound outlet of the sound cavity shell, the cover shell comprises a connecting part and an earmuff part matched with the connecting part, the supporting frame is positioned in the space of the sound cavity structure, an inner concave structure is formed on one end face of the supporting frame facing the bottom of the sound cavity shell, the inner concave structure is cylindrical and forms a rear end cavity of the supporting frame, one end of the rear end cavity is open, the other end of the rear end cavity is a bottom of a porous structure, a flange extending outwards along the radial direction of the rear end cavity is arranged on the periphery of the bottom, the flange is concave towards the central part of one end face of the cover shell to form a front end cavity for the piezoelectric loudspeaker to be arranged, a column body is formed in the center of the front end cavity, a through hole structure penetrating through the two ends of the column body and the bottom is arranged on the column body, and a flange hollow part connected with the periphery of the front, an outer ring structure is formed between the hollow-out part of the flange and the outer circumferential surface of the flange, and the shape and the size of the outer contour of the outer ring structure are matched with the cover shell; the piezoelectric loudspeaker is arranged in the front end cavity, a diaphragm part of the piezoelectric loudspeaker is provided with a central hole with the same central axis of the through hole structure, and the other types of loudspeaker units are correspondingly arranged in the through hole structure, or the other types of loudspeaker units are correspondingly arranged in the space of the sound cavity structure.

The utility model has the advantages that: the utility model discloses to the physical limit and the electroacoustic performance upper limit problem (for example, the frequency response scope can't last extend to 40kHz) of its existence of sound generating unit that earphone equipment adopted in the past, integrate and innovate on the type of sound generating unit and the compound mode of multiple sound generating unit. Therefore, improvement and innovation are carried out on the internal structure design of the earphone device, the self characteristics and the physical limit of the sound production unit, so that the sound quality effect with clear, wide and natural hierarchy is achieved on the sound expression level; the adoption of the piezoelectric loudspeaker achieves a new height on the detailed presentation level, and the quality presentation of sound is directly influenced, so that the purpose of the body-cutting experience of a listener is influenced.

The present invention will be further explained with reference to the drawings and the embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is an overall schematic view of the combined structure of multiple sound emitting units of the present invention.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is a schematic view of the earplug of the present invention in an overall perspective structure.

Fig. 4 is an exploded view of fig. 3.

Fig. 5 is a frequency division circuit diagram of the earplug of the present invention.

Fig. 6 is a schematic structural diagram of a preferred embodiment of the earphone device of the present invention.

Fig. 7 is a schematic structural diagram of another preferred embodiment of the earphone device of the present invention.

Fig. 8 is a schematic structural diagram of another preferred embodiment of the earphone device of the present invention.

Detailed Description

The present invention will be further described with reference to the following embodiments and the accompanying drawings, wherein the following description sets forth more details for the purpose of fully understanding the present invention, but it is obvious that the present invention can be implemented in various other ways different from those described herein, and those skilled in the art can make similar generalizations and deductions according to the actual application without departing from the spirit of the present invention, and therefore, the scope of the present invention should not be limited by the contents of the embodiments.

The piezoelectric speaker 100 of the present invention is used for playback of ultra high frequencies extending up to 40kHz in the frequency response range.

In the following, other types of speaker units mentioned in the present invention include a moving iron sound generating unit 200, a flat diaphragm sound generating unit 300, an electrostatic speaker 400, and a moving coil sound generating unit 500; the above units in the preset combination mode are correspondingly arranged in one earshell of the earphone device, and the units are correspondingly connected to a left channel input circuit or a right channel input circuit of the earphone device to form monophonic loudspeaker.

In a preferred embodiment of the present invention, the movable coil sound generating unit 500 is adapted to the earplug 2 of the present invention (the diameter of the movable coil sound generating unit 500 is ten to twelve millimeters). In the earplug 2 of the present invention, the adopted diameter size value of the piezoelectric speaker 100 is five to six millimeters.

The structure of the multiple sound unit assembly according to the present invention will be described in detail with reference to fig. 1 to 2.

A multiple sound unit assembly structure 1 of the present embodiment includes:

the loudspeaker comprises a shell assembly 11, a piezoelectric loudspeaker 100 and other loudspeaker units of different types from the piezoelectric loudspeaker 100, wherein the shell assembly 11 comprises a sound cavity shell 110, a cover shell 111 and a support frame 112 arranged between the sound cavity shell 110 and the cover shell 111, a sound cavity structure corresponding to the piezoelectric loudspeaker 100 and the other loudspeaker units is formed inside the sound cavity shell 110, a hollow structure 1103 used for communicating the sound cavity structure with an external environment is formed on the sound cavity shell 110, or the sound cavity structure formed by the sound cavity shell 110 is sealed with the external environment; in this embodiment, the sound cavity housing 110 includes a main sound cavity housing 1101 and an acoustically transparent cover 1102. In the design concept of the present invention, according to the electroacoustic characteristic and the structural characteristic of the practical application scheme and the various types of speaker units, the sound cavity structure is formed to be open or closed according to the open mode of sound. When the loudspeaker unit is an open type loudspeaker, other types of loudspeaker units (aiming at the plane diaphragm sound generating unit 300 and the electrostatic loudspeaker 400) are communicated with the external environment through the sound cavity shell 110, and the loudspeaker unit has the characteristics of wide sound field expression, high balance of high, medium and low frequencies, neutral and natural sound color and listening feeling; when the closed type earphone is designed, the sound cavity housing 110 completely covers the whole auricle, i.e. the sound cavity housing 110 does not have the hollow structure 1103 at all, so that the sound leakage can be prevented, the influence of the external sound can be prevented, and the sound-sensitive characteristic of the closed type earphone with rich sound details can be achieved.

The cover 111 is covered on the sound outlet of the sound cavity housing 110, the cover 111 includes a connection portion 1110 and an ear cover portion 1111 assembled with the connection portion 1110, the supporting frame 112 is located in the space of the sound cavity structure, an end surface of the supporting frame 112 facing the bottom of the sound cavity housing 110 is formed with an inner concave structure, the inner concave structure is cylindrical to form a rear end cavity 1121 of the supporting frame 112, one end of the rear end cavity 1121 is open, the other end is a bottom of a porous structure (not shown), a periphery of the bottom is provided with a flange 1122 extending outward in a radial direction of the rear end cavity 1121, the flange 1122 is concave toward a center portion of an end surface of the cover 111 to form a front end cavity 1123 for the piezoelectric speaker 100, a column 1121124 is formed at a center of the front end cavity 1123, the column 1124 is provided with a through hole structure 1125 penetrating through two ends of the column 1124 and the bottom, the middle part of the flange 1122 is provided with a flange hollow part 1126 connected with the periphery of the front end cavity 1123, an outer ring structure 1127 is formed between the flange hollow part 1126 and the outer circumferential surface of the flange 1122, and the outer contour shape and size of the outer ring structure 1127 are matched and matched with the cover shell 111. The cover shell 111 and the sound cavity shell 110 form the sound cavity structure in a combined manner. Support frame 112 is constituted the utility model discloses the mounting means of medium voltage electric loudspeaker 100, front end cavity 1123 constitutes the helping sound chamber of piezoelectric loudspeaker 100, and the promotion of supplementary piezoelectric loudspeaker 100 loudness does benefit to and presents more sound details. When other types of speaker units (for the planar diaphragm sound generating unit 300 and the electrostatic speaker 400) installed in the sound cavity structure space work, the emitted sound waves pass through the flange hollow-out portion 1126 and propagate to the human ear.

In a preferred embodiment, during operation, a part of sound waves emitted by other types of speaker units (for the planar diaphragm sound generating unit 300 and the electrostatic speaker 400) installed in the sound cavity structural space is converged in the rear end cavity 1121, the rear end cavity 1121 is located at the central position of the support frame 112, the piezoelectric speaker 100 is installed at the central position of the support frame 112, and the piezoelectric speaker 100 and the pillar 1124 are arranged on the same central axis. In one example, taking the combination of the planar diaphragm sound generating unit 300 or the electrostatic speaker 400 as an example, the piezoelectric speaker 100 and the planar diaphragm sound generating unit 300 or the electrostatic speaker 400 are both installed in independent sound cavities, and the structure has independent acoustic cavities (the front end cavity 1123 and the sound cavity housing 110), so that the performance of ultrahigh frequency and overtone details above 15KHz is effectively improved according to the electroacoustic characteristics of each speaker unit and the use of the piezoelectric ceramic unit, and thus, a more excellent frequency band combination can be obtained, and an excellent playback effect is achieved.

The piezoelectric speaker 100 is installed in the front-end cavity 1123, a center hole 1001 having the same central axis as the through-hole structure 1125 is formed in a diaphragm portion of the piezoelectric speaker 100, and the other types of speaker units are installed in the through-hole structure 1125 correspondingly, or the other types of speaker units are installed in a space of the sound cavity structure correspondingly. The utility model discloses an in a preferred embodiment, to moving iron sound production unit 200's compound mode, cylinder 1124 constitutes moving iron sound production unit 200's bearing structure, move iron sound production unit 200 install in through hole structure 1125 through sound guide pipe (not shown) to piezoelectric speaker 100 conducts outward, the directional ear canal direction of people's ear of sound guide pipe makes its physical location be close to some sound source through the coincidence of two speakers of high pitch (piezoelectric speaker 100) and well bass (moving iron sound production unit 200) on the diaphragm face (piezoceramics piece), reaches more outstanding sound field location effect.

The piezoelectric speaker 100 and other types of speaker units described above are used for the earplug 2 of the present invention. The detailed description is made with reference to fig. 3, 4 and 5.

The earplug 2 of the present embodiment further comprises a sound cavity housing assembly comprising a main housing 21, an inner housing 22, a sound cavity housing 23 and a sound transparent cover housing 24, and the other types of speaker units comprise a moving coil sound generating unit 500 and a moving iron sound generating unit 200. The main casing 21 has the main part, and the main part is inside to be formed with the accommodation space who supplies interior casing 22 installation, is equipped with the wiring portion 210 that supplies the audio conductor to connect in the main part, and a side of main part is equipped with speaker portion 211, and another lateral part is equipped with the main part opening, and speaker portion 211 is connected with silica gel cover 25, interior casing 22 has first sound chamber part 220 and the cup joint part 221 of the first sound chamber part 220 of intercommunication, first sound chamber part 220 comprises installation part 2201 and guide hole part 2202 integrative with installation part 2201, guide hole part 2202 is linked together with cup joint part 221, installation part 2201 orientation the position setting of speaker portion 211, cup joint part 221 are the cylinder, sound chamber shell 23 with moving coil sound generating unit 500 looks adaptation matched stack, sound-transparent cover shell 24 lid is located the main part opening. The piezoelectric speaker 100 is installed in the first sound cavity portion 220, the speaker end of the piezoelectric speaker 100 faces the speaker portion 211, the moving coil sound generating unit 500 is simultaneously placed in the installation portion 2201, the moving iron sound generating unit 200 is installed at the bottom position of the inner housing 22, and the piezoelectric speaker 100 and the moving coil sound generating unit 500 are installed side by side.

In this embodiment, the diameter of the moving coil sound generating unit 500 is preferably twelve millimeters, which is responsible for outputting heavy bass sound; the moving iron sounding unit 200 is a medium-low sounding unit; the diameter of the piezoelectric speaker 100 of the earplug 2 of the present invention is five millimeters, and is responsible for the performance of the ultra-high frequency and the overtone details above 15 KHz. Further, the main casing 21 passes through the main part opening cup joints with interior casing 22 mutually, and the installation portion 2201 of interior casing 22 has the confession the installation space of piezoelectric speaker 100, and the vibrating diaphragm face of piezoelectric speaker 100 faces speaker portion 211, move indisputable sound generating unit 200 installs in the bottom of installation portion 2201, move circle sound generating unit 500 is put into in the sound chamber shell 23, move circle sound generating unit 500's vibrating diaphragm face towards speaker portion 211, put into in the space of cup joint part 221, interior casing 22 constitutes the independent sound chamber of moving circle sound generating unit 500 with sound chamber shell 23, wherein, the sound wave that move circle sound generating unit 500 sent out by guide hole part 2202 direction speaker portion 211. According to the sound directivity characteristics of the moving coil sound emission unit 500, the moving iron sound emission unit 200, and the piezoelectric speaker 100, sounds in each frequency band are more distinct and distortion is minimized during sound emission operation.

The utility model discloses an earplug 2 still includes frequency division circuit 26, and frequency division circuit 26 of this embodiment is the monophonic circuit, and frequency division circuit 26 includes resistance R1, electric capacity C1 and electric capacity C2, and resistance R1 establishes ties in frequency division circuit 26's input circuit, piezoelectric speaker 100 establishes ties with resistance R1, electric capacity C1 connects in parallel in input circuit, move indisputable sound production unit 200 and electric capacity C1 and connect in parallel, electric capacity C2 connects in parallel in input circuit, move circle sound production unit 500 and electric capacity C2 and connect in parallel.

According to the above technical solution, the resistance value of the resistor R1 of the present embodiment is 20 Ω.

Further, the capacitor C1 and the capacitor C2 of the present embodiment are both tantalum capacitors, and the capacitance C of the capacitor C1 is 0.22 uF; the capacitance C of the capacitor C2 is 1 uF.

To the utility model relates to an earphone equipment adopts the polycell integrated configuration of above-mentioned content. This is explained in detail with reference to fig. 6, 7 and 8.

The following is a description of first to fourth modified examples of the multi-cell combination structure according to the embodiment of the present invention.

A modification of the multi-cell combination structure according to the embodiment of the present invention will be described with reference to fig. 2 as a point. Wherein, the diameter size of the adopted piezoelectric speaker 100 is larger than five millimeters, which is different from the specification size of the piezoelectric speaker 100 adopted by the earplug 2 of the utility model. The multi-cell combination structure according to the first modification differs from the above-described embodiment in the following respects. In this embodiment, the other type of speaker unit is a moving-iron sound-producing unit 200, the moving-iron sound-producing unit 200 is installed in the through-hole structure 1125, the sound-guiding tube of the moving-iron sound-producing unit 200 extends horizontally outward from the central hole 1001, the piezoelectric speaker 100 is disposed in the front-end cavity 1123, and the sound cavity housing 110 forms the sound cavity structure and is disposed in a closed manner with the external environment. The sound cavity housing 110 completely covers the entire auricle, prevents the sound emitted by the piezoelectric speaker 100 and the moving-iron sound-generating unit 200 from leaking, and prevents the influence of external sound, which is beneficial to the presentation of sound details and the enrichment of hearing.

In another preferred embodiment, the number of the moving-iron sound generating units 200 of this embodiment is two, and the two moving-iron sound generating units include a middle bass unit and a bass unit, which are correspondingly installed in the through-hole structure 1125 of the cylinder 1124, and for the combination manner of the moving-iron sound generating unit 200 and the piezoelectric speaker 100, the cylinder 1124 constitutes a supporting structure of the moving-iron sound generating unit 200, the moving-iron sound generating unit 200 is installed in the through-hole structure 1125 and is conducted to the outside of the piezoelectric speaker 100 through a sound guide tube (not shown), the sound guide tube points to the ear canal direction of the human ear, and the physical positioning of the three speakers of the high pitch (piezoelectric speaker 100) and the middle bass (moving-iron sound generating unit 200) is close to the point sound source through the coincidence of the diaphragm surface (piezoelectric ceramic plate), so as to. Specifically, the midbass unit and the subwoofer unit are both sound-conducting out of the central hole 1001 through the sound-conducting tubes corresponding to each other individually. By the structure, the problem of interference between unit sound waves when the double-moving-iron sounding unit 200 shares a cavity is solved.

Next, a second modification of the multi-cell combination structure according to the embodiment of the present invention will be described with reference to fig. 6. The multi-unit combination structure according to the second modification is mainly different from the first modification in the sound generating unit 300 of the flat diaphragm and the sound effect generated by the sound generating unit.

The planar diaphragm sound generating unit 300 in this embodiment is installed in the sound cavity structure, the piezoelectric speaker 100 is installed in the front end cavity 1123, the sound cavity housing 110 includes a main sound cavity housing 1101 and a sound-transmitting cover 1102, a dust-proof film 11010 is disposed at a position of the main sound cavity housing 1101 corresponding to a diaphragm surface of the planar diaphragm sound generating unit 300, and a hollow structure 1103 for communicating the sound cavity structure with an external environment is formed at a position of the sound-transmitting cover 1102 corresponding to the diaphragm surface.

The sound cavity structure is communicated with the external environment through the hollow structure 1103, and the sound cavity structure is open due to the fact that the plane vibrating diaphragm sound generating unit 300 has no sound insulation obstruction. According to the characteristics of the plane diaphragm sound generating unit 300, such as excellent sound output linearity, excellent low-frequency performance and excellent detail reducibility, the earphone device of the present embodiment has the characteristics of wide sound field performance, ideal balance of high, medium and low frequencies, and neutral and natural sound color.

The third modification example:

this embodiment is basically the same as the first and second modifications, and differs therefrom in that: referring to fig. 7, the other type of speaker unit is an electrostatic speaker 400, where the electrostatic speaker 400 includes a plate assembly 4001 and a diaphragm module 4002, the electrostatic speaker 400 is installed in the sound cavity structure, the piezoelectric speaker 100 is installed in the front end cavity 1123, and the sound cavity housing 110 is formed with a hollow-out structure 1103 for communicating the sound cavity structure with an external environment. This structure is an open type sound generation technique because the electrostatic speaker 400 has no sound insulation hindrance. According to the electrostatic speaker 400, excellent sound characteristics of high and medium frequency details, strong analysis force, excellent transient response, and prominent detailed feeling can be provided, and the earphone device of the present embodiment has characteristics of wide sound field expression, ideal balance of high, medium, and low frequencies, and ideal and natural sound quality.

A fourth modification example:

referring to fig. 8, the present embodiment is substantially the same as the first, second and third modifications, and has the difference that the other types of speaker units include a planar diaphragm sound generating unit 300 and a moving-iron sound generating unit 200, the moving-iron sound generating unit 200 is installed in the through-hole structure 1125, a sound guide tube of the moving-iron sound generating unit 200 extends horizontally outward from the central hole 1001, the planar diaphragm sound generating unit 300 is installed in the sound cavity structure, the piezoelectric speaker 100 is installed in the front-end cavity 1123, and the sound cavity housing 110 is formed with a hollow structure 1103 for communicating the sound cavity structure with an external environment. In this embodiment, move indisputable unit, piezoelectric loudspeaker 100 and plane vibrating diaphragm sound generating unit 300 front and back same central axis and place, through the permutation and combination of high pitch (piezoelectric loudspeaker 100) and well bass (move indisputable sound generating unit 200) and the three speakers of (full frequency) plane vibrating diaphragm sound generating unit 300, when can restoreing more sound details, reach the frequency response scope purpose that surpasss the moving coil earphone in the past.

While the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields suitable for the invention, and further modifications may be readily effected by those skilled in the art, without thereby departing from the generic concept as defined by the claims and their equivalents, and without thereby limiting the specific details and illustrations presented herein.

Claims

1. A multiple sound unit composite structure comprising a housing assembly, a piezoelectric speaker, and a speaker unit of a type different from that of the piezoelectric speaker,

the shell assembly comprises a sound cavity shell, a cover shell and a support frame arranged between the sound cavity shell and the cover shell, the inside of the sound cavity shell forms a sound cavity structure corresponding to the piezoelectric loudspeaker and the loudspeaker unit, and the sound cavity shell is provided with a hollow structure used for communicating the sound cavity structure with an external environment, or

The sound cavity shell forms the sound cavity structure and is arranged in a closed manner with an external environment;

the cover shell cover is arranged at a sound outlet of the sound cavity shell, the cover shell comprises a connecting part and an earmuff part matched with the connecting part, the supporting frame is positioned in the space of the sound cavity structure, an inner concave structure is formed on one end face of the supporting frame facing the bottom of the sound cavity shell, the inner concave structure is cylindrical and forms a rear end cavity of the supporting frame, one end of the rear end cavity is open, the other end of the rear end cavity is a bottom of a porous structure, a flange extending outwards along the radial direction of the rear end cavity is arranged on the periphery of the bottom, the flange is concave towards the central part of one end face of the cover shell to form a front end cavity for the piezoelectric loudspeaker to be arranged, a column body is formed in the center of the front end cavity, a through hole structure penetrating through the two ends of the column body and the bottom is arranged on the column body, and a flange hollow part connected with the periphery of the front, an outer ring structure is formed between the hollow-out part of the flange and the outer circumferential surface of the flange, and the shape and the size of the outer contour of the outer ring structure are matched with the cover shell;

the piezoelectric loudspeaker is arranged in the front end cavity, the vibrating diaphragm part of the piezoelectric loudspeaker is provided with a central hole with the same central axis as the through hole structure, and the loudspeaker unit is correspondingly arranged in the through hole structure, or

The loudspeaker unit is correspondingly arranged in the space of the sound cavity structure.

2. The multiple sound unit assembly of claim 1, wherein the speaker unit is a moving iron sound unit, the moving iron sound unit is installed in the through-hole structure, a sound guide tube of the moving iron sound unit extends horizontally from the central hole, the piezoelectric speaker is installed in the front cavity, and the sound cavity housing forms the sound cavity structure and is sealed from an external environment.

3. The multiple sound unit combination structure of claim 2, wherein the number of the moving iron sound units is two, and the moving iron sound units comprise a midbass unit and a subwoofer unit, and the midbass unit and the subwoofer unit are respectively in sound conduction to the outside of the central hole through the sound guide tubes which are respectively corresponding to the midbass unit and the subwoofer unit.

4. The multiple sound unit assembly structure of claim 2, wherein the speaker unit is a planar diaphragm sound unit, the planar diaphragm sound unit is installed in the sound cavity structure, and the sound cavity housing is formed with a hollow structure for communicating the sound cavity structure with an external environment.

5. The multiple sound unit assembly structure of claim 2, wherein the speaker unit is an electrostatic speaker, the electrostatic speaker is mounted in the sound cavity structure, and the sound cavity housing is formed with a hollow structure for communicating the sound cavity structure with an external environment.

6. The multiple sound unit assembly of claim 2, wherein the speaker unit comprises a planar diaphragm sound unit, the planar diaphragm sound unit is mounted in the sound chamber structure, and the sound chamber housing is formed with a hollow structure for communicating the sound chamber structure with an external environment.