A global broadband loudspeaker and a global broadband sound emitting method

Abstract

This invention relates to a full-range wideband loudspeaker and its full-range wideband sound generation method, comprising a sealed outer casing and a frame body. The frame body includes a base column, with mounting portions at both ends. Each mounting portion houses a first sound-generating unit coaxial with the base column, and the sound-generating ends of the two first sound-generating units are arranged facing each other to form a reverse sound generation structure. The two mounting portions, the base column, and the sealed outer casing enclose an annular side sound cavity, with multiple through holes circumferentially provided in the mounting portions. A second sound-generating unit is mounted on the sealed outer casing. The sound emitted by the two first sound-generating units sequentially enters the side sound cavity through the mounting portions and through the through holes, while the sound emitted by the second sound-generating unit directly enters the side sound cavity. The three sets of sound waves converge and couple within the side sound cavity to form a full-range sound wave, which is ultimately radiated laterally through the sound outlet. This invention achieves integrated coaxial support and lateral full-range wideband sound generation, offering advantages such as compact structure, high magnetic circuit efficiency, wide frequency response range, and ease of integration into ultra-thin devices.

Description

Technical Field

[0001] This invention relates to the technical field of loudspeakers, and more specifically, to a full-range broadband loudspeaker and a full-range broadband sound generation method. Background Technology

[0002] As portable electronic devices (such as TWS earphones, smartwatches, AR / VR glasses, etc.) rapidly develop towards miniaturization and thinner designs, higher demands are placed on the size control and acoustic performance of internal electroacoustic transducers (speakers). In order to achieve greater loudness and better sound quality within a limited micro-cavity, full-range wideband loudspeakers and coaxial loudspeaker technologies have gradually become a hot research topic in the industry.

[0003] However, existing dual-unit loudspeakers still have the following obvious shortcomings in practical applications: Firstly, existing dual-unit loudspeakers are typically fixed and supported by two separate fixed frames. This modular assembly structure is prone to cumulative errors during assembly, making it difficult to ensure strict coaxiality of the two sound-generating units, resulting in uneven sound field distribution. Simultaneously, the unavoidable assembly gap between the two separate fixed frames not only increases the number of parts and assembly steps but also prevents the two magnetic circuit systems from being tightly integrated, exacerbating magnetic leakage losses and significantly reducing overall electroacoustic conversion efficiency.

[0004] Secondly, traditional loudspeakers mostly use an axial sound path, meaning that sound is radiated directly from the front of the diaphragm along the axial direction. This sound output method requires that sufficient sound outlet and front cavity space be reserved on the front of the device (i.e., the front of the diaphragm) during the assembly of the final product, which seriously encroaches on the space in the Z-axis (thickness) direction inside the device, which is not conducive to the industrial design of ultra-thin electronic products.

[0005] Third, existing dual-unit loudspeakers typically only have two mid-low frequency units, with the sound output ends of the two mid-low frequency units facing outwards and lacking a dedicated ultra-high frequency unit; or even if an additional high frequency unit is added, because the cavity of each unit is isolated from each other and the sound wave path is independent, the high frequency sound waves cannot be effectively integrated with the mid-low frequency sound waves in the shared coupling cavity before lateral radiation, resulting in limited high frequency extension and premature decay of the frequency response curve in the high frequency range, making it difficult to achieve true full-range wideband reproduction and affecting the detail reproduction and sense of airiness in the listening experience.

[0006] Therefore, developing a loudspeaker structure with a full-range wideband response is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a full-range broadband loudspeaker and a full-range broadband sound generation method, in view of the above-mentioned defects of the prior art.

[0008] The technical solution adopted by this invention to solve its technical problem is as follows: On one hand, the present invention provides a wide-range loudspeaker, comprising a sealed outer casing and a frame body fixed inside the sealed outer casing; the frame body includes a base column, and each end of the base column is provided with a mounting part fixedly connected to the sealed outer casing; each of the two mounting parts has a first sound-emitting unit inside its receiving cavity; both sets of the first sound-emitting units are coaxial with the base column, and the sound-emitting ends of the two sets of the first sound-emitting units are arranged facing each other to form a reverse sound-emitting structure; the two mounting parts, the base column, and the sealed outer casing enclose each other to form an annular side sound cavity; the mounting parts are provided with a plurality of through holes circumferentially communicating with the receiving cavity and the side sound cavity; the sealed outer casing is also provided with a sound outlet hole communicating with the side sound cavity, and a second sound-emitting unit that emits sound toward the side sound cavity; the sealed outer casing is provided with three exhaust holes, each corresponding to one of the two sets of the first sound-emitting units and the second sound unit, for venting sound waves from the back of the first sound unit and the second sound unit to balance the air pressure; The sound emitted by the first sound unit enters the side sound cavity sequentially through the receiving cavity and the through hole, and the sound emitted by the second sound unit directly enters the side sound cavity. The sound waves of the three sets of sound units converge and couple in the side sound cavity to form a full-frequency sound wave. All the sound in the side sound cavity is finally radiated outward through the sound outlet hole to form a lateral sound path.

[0009] The wideband loudspeaker of the present invention includes a mounting portion comprising an annular support plate extending laterally outward from the outer edge of the base post, and a first sidewall extending longitudinally outward from the outer edge of the annular support plate; the annular support plate, the first sidewall, and the base post surround each other to form the receiving cavity; and a plurality of through holes are circumferentially distributed on the annular support plate.

[0010] The wideband loudspeaker of the present invention comprises a first sound-generating unit including a magnet, a washer, and a diaphragm assembly arranged sequentially from the inside out; the magnet, washer, and diaphragm assembly are coaxially arranged; the magnet provides a magnetic field, the washer guides the magnetic lines of force of the magnet to the gap of the voice coil of the diaphragm assembly, and the voice coil of the diaphragm assembly drives the diaphragm to vibrate and generate sound under the action of the electromagnetic field; the sound-generating end of the diaphragm assembly faces the washer, and the exhaust end of the diaphragm assembly faces the corresponding exhaust port.

[0011] The wideband loudspeaker of the present invention comprises a base post having coaxially arranged recesses at both its upper and lower ends, which are connected to the corresponding receiving cavities; the magnet and the washer are fixed in the recesses, and the diaphragm assembly is fixed on the mounting part; a gap is provided between the inner wall of the recess and the first sound-emitting unit, so that the sound inside the recess flows through the gap from the through hole to the side sound cavity.

[0012] The wideband loudspeaker of the present invention includes a sealed outer casing comprising an annular second sidewall and two sealing plates respectively fixed at the upper and lower ends of the second sidewall for sealing the side acoustic cavity; the sound outlet is disposed on the second sidewall opposite to the second sound-emitting unit.

[0013] The full-range wideband loudspeaker of the present invention has an outwardly extending positioning protrusion on the side of the second sidewall opposite to the sound outlet, and the second sound-emitting unit is detachably mounted on the positioning protrusion.

[0014] The full-range wideband loudspeaker of the present invention includes a second sound-generating unit comprising a housing and a sound-generating module fixed within the housing; the sound-generating module is one of a moving coil unit, a moving iron unit, or a piezoelectric unit.

[0015] The wideband loudspeaker of the present invention has a tuning mesh provided at the exhaust port on one side of each of the two first sound generating units on the sealed outer cover, for damping and adjusting the airflow and sound waves discharged from the exhaust port to suppress airflow noise.

[0016] The wideband loudspeaker of the present invention further includes a voice coil connection PCB on the second sidewall. The voice coil connection PCB is fixed on the second sidewall and has multiple conductive terminals that are electrically connected to the voice coil leads of the first sound-emitting unit and the voice coil leads of the second sound-emitting unit, respectively, for enabling external audio electrical signals to be electrically connected to any sound-emitting unit.

[0017] On the other hand, the present invention also provides a method for generating sound using a global wideband loudspeaker, employing any of the global wideband loudspeakers described above, wherein the method includes the following steps: Step S1: Receive audio electrical signal and drive the two coaxially arranged first sound units to vibrate in opposite directions simultaneously, so that the sound-emitting ends of the two sets of first sound units face each other to generate main sound waves and the exhaust ends face away to generate back sound waves; at the same time, drive the second sound unit to vibrate, so that it directly emits auxiliary sound waves into the annular side sound cavity formed by the two mounting parts, the base column and the sealed outer cover. In step S2, the main sound waves generated by the sound-emitting ends of the two sets of first sound-emitting units first radiate into their respective corresponding receiving cavities, and then flow from the inside to the outside into the side sound cavity through multiple through holes arranged circumferentially on the mounting part. In step S3, the two main sound waves flowing into the side sound cavity are acoustically coupled with the auxiliary sound waves to form a full-frequency sound wave, which then radiates outward through the sound outlet on the sealed outer cover, forming a side sound path. In step S4, while the main sound wave and the auxiliary sound wave radiate laterally, the back sound waves generated by the exhaust ends of the two sets of first and second sound units are discharged outward through the corresponding exhaust holes to balance the pressure difference between the inside and outside of each sound unit when it vibrates.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The frame body of this invention includes a base column and two mounting parts disposed at both ends of the base column. Both first sound-generating units are directly fixed to the same frame body, avoiding the axial misalignment problem caused by assembly gaps and accumulated tolerances in traditional split-type assembly structures. This ensures that the two sets of first sound-generating units have a high degree of mechanical coaxiality with the base column. Simultaneously, the integrated structure eliminates the assembly gaps between the two magnetic circuit systems, significantly reducing magnetic leakage loss and allowing magnetic field energy to be more efficiently confined within the magnetic circuit gaps. The electromagnetic conversion efficiency can be improved by more than 15% compared to the split structure. Under the same magnetic flux conditions, this invention can achieve higher sound pressure output and lower distortion, providing a key structural foundation for miniaturized high-sensitivity loudspeakers.

[0019] 2. This invention overcomes the limitations of traditional dual-unit loudspeakers, which only have two mid-low frequency units with their sound-emitting ends facing outwards and lack high-frequency extension capabilities. On one hand, the sound-emitting ends of the two sets of first sound units are set facing each other, forming a mid-low frequency sound source with reverse sound emission, effectively suppressing even-order harmonic distortion and improving the density and power of mid-low frequencies. On the other hand, the second sound unit is set independently and radiates high-frequency sound waves directly towards the side cavity, further extending the ultra-high frequency range. More importantly, the two mid-low frequency sound waves converge into the annular side cavity through the receiving cavity and circumferential through-hole, while the high-frequency sound waves directly enter the same side cavity. The three sets of sound waves achieve seamless convergence and coupling within the shared cavity, completely solving the problem of premature high-frequency attenuation caused by cavity isolation and independent paths in traditional multi-unit loudspeakers. This allows the entire frequency response curve to extend smoothly from low frequencies to ultra-high frequencies, truly achieving full-range wideband reproduction, and significantly improving detail reproduction and sense of airiness.

[0020] 3. In this invention, the main sound waves emitted by the two first sound-emitting units first enter their respective receiving cavities. After compression, they are forced to diffuse evenly into the annular side sound cavity through multiple through holes distributed circumferentially on the mounting part. This process not only acts as an acoustic low-pass filter, filtering out high-frequency noise generated by the mid-low frequency units themselves, but also avoids sound field deflection and turbulence caused by sound waves entering the side sound cavity in a single direction. The second sound-emitting unit directly radiates high-frequency sound waves into the side sound cavity, which has the shortest path and the least loss of high-frequency details. The three sound waves are superimposed radially in the same direction within the annular side sound cavity, avoiding the direct collision and cancellation phenomenon of sound waves when traditional dual-unit back-to-back sound emission, significantly reducing standing wave interference and sound energy loss, making the sound radiated from the sound outlet more robust, full, and transparent. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort: Figure 1 This is a schematic diagram of the structure of a full-range wideband loudspeaker in Embodiment 1 of the present invention.

[0022] Figure 2 yes Figure 1 An exploded three-dimensional diagram of a full-range wideband loudspeaker.

[0023] Figure 3 yes Figure 2 A schematic diagram of the structure of the middle basin frame body 12.

[0024] Figure 4 yes Figure 2 A schematic diagram of the structure of the sealed outer cover 11.

[0025] Figure 5 yes Figure 1 A top-view diagram of the sound emission state of a full-range broadband loudspeaker.

[0026] Figure 6 yes Figure 1 A three-dimensional cross-section of a full-range wideband loudspeaker.

[0027] Figure 7 yes Figure 6 A cross-sectional view of the sound emission state of a full-range broadband loudspeaker.

[0028] Figure 8 yes Figure 7 A schematic diagram of sound wave propagation in a wideband loudspeaker.

[0029] Figure 9This is a system performance simulation comparison table of a conventional positive omnidirectional wideband loudspeaker and an omnidirectional wideband loudspeaker according to Embodiment 1 of the present invention. Detailed Implementation

[0030] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0033] Furthermore, the terms indicating orientation, such as "up, down, front, back, left, right, upper end, lower end, longitudinal," etc., are all based on the posture and position of the device or equipment described in this solution during normal use.

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0035] Example 1: A preferred embodiment of the present invention provides a wideband loudspeaker, such as... Figures 1 to 2 As shown, it includes a sealed outer cover 11 and a basin frame body 12 fixed inside the sealed outer cover 11.

[0036] In this embodiment, the basin frame body 12 is a one-piece molded structure, such as using mature high-strength engineering plastics or metal integral die casting or injection molding, as in existing technologies. Figure 3 As shown, the basin frame body 12 includes a base column 121, and mounting portions 122 at both ends of the base column 121 are fixedly connected to the sealed outer cover 11. The base column 121 is a cylindrical structure, and the mounting portion 122 is a disc structure coaxially arranged with it, with a diameter larger than that of the base column 121. The one-piece molded basin frame body 12 eliminates assembly errors and magnetic leakage gaps caused by traditional split-assembly, providing a precise positioning reference for the magnetic circuit system and enabling full utilization of the energy of the entire magnetic circuit system.

[0037] like Figure 4-7 As shown, each of the two mounting portions 122 has a first sound-emitting unit 13 in its accommodating cavity 01; both sets of the first sound-emitting units 13 are coaxial with the base column 121, and the sound-emitting ends of the two sets of the first sound-emitting units 13 are arranged facing each other to form a reverse sound-emitting structure; the two mounting portions 122, the base column 121, and the sealed outer cover 11 surround each other to form an annular side sound cavity 02; the mounting portion 122 has a plurality of through holes 123 circumferentially connected to the accommodating cavity 01 and the side sound cavity 02; the sealed outer cover 11 is also provided with a sound outlet hole 111 connected to the side sound cavity 02, and a second sound-emitting unit 14 that emits sound toward the side sound cavity 02; In this embodiment, the sound outlet 111 serves as the terminal outlet of the entire lateral sound path, guiding the sound pressure gathered in the side sound cavity 02 to the external environment along the radial direction of the speaker, thereby achieving efficient and smooth radiation of sound waves and avoiding the accumulation and cancellation of internal sound waves.

[0038] The sealed outer cover 11 is provided with three exhaust holes 112, which are respectively corresponding to the two sets of the first sound-generating units 13 and the second sound-generating units 14, for the sound waves on the back of the first sound-generating units 13 and the second sound-generating units 14 to be discharged to balance the air pressure.

[0039] Specifically, in this embodiment, "reverse" means that the sound-emitting ends of both sets of first sound-emitting units 13 are facing inward, that is, towards the base column 121, and emit sound in opposite directions. This is different from the traditional speaker diaphragm assembly, which emits sound outward (i.e., away from the base column). This inward-facing structural design makes the vibration directions of the two sets of diaphragms completely opposite. During operation, the sound emitted by the two first sound-emitting units 13 enters the side sound cavity 02 sequentially through the receiving cavity 01 and the through hole 123. The sound emitted by the second sound unit 14 directly enters the side sound cavity 02. The sound waves of the three sets of sound-emitting units converge and couple in the side sound cavity 02 to form a full-frequency domain sound wave. All the sound in the side sound cavity 02 is finally radiated outward through the sound outlet 111, forming a lateral sound emission path.

[0040] This side-emitting sound design differs from the axial sound emission of traditional loudspeakers. When assembling end products (such as ultra-thin electronic devices), the annular side cavity 02 provides a crucial confluence and superposition space for the three sets of superimposed sound waves. Since the sound-emitting ends of the two sets of first sound units face each other, while the second sound unit emits sound radially into the side cavity 02, the setting of the side cavity 02 effectively guides the sound waves to diffuse evenly and superimpose in the same direction along the annular path. This avoids direct collision and cancellation of sound waves and disordered reflection in the narrow inner cavity, significantly reducing sound energy loss. It also smooths the high-frequency transition response and enhances the density and thickness of the mid-frequency, making the sound radiated from the sound outlet 111 more robust and full, greatly improving the acoustic performance of the compact structure.

[0041] This invention forms a reverse sound-emitting structure by setting two sets of first sound-emitting units that emit sound in opposite directions. This allows the anti-phase sound waves generated by the two sets of first sound-emitting units to undergo acoustic cancellation and coupling within the receiving cavity and the side sound cavity, effectively reducing standing wave interference and distortion within the cavity. At the same time, the first sound-emitting unit responsible for mid-to-low frequency sound waves and the second sound-emitting unit responsible for high frequency sound waves are integrated in the same side sound cavity. The side sound cavity is used as a "container" for sound wave mixing, achieving seamless convergence of sound waves across the entire frequency range, which are ultimately radiated through the side sound outlet.

[0042] like Figure 3 As shown, in this embodiment, the mounting portion 122 includes an annular support plate 1221 extending laterally outward from the outer edge of the base column 121, and a first sidewall 1222 extending longitudinally outward from the outer edge of the annular support plate 1221. The annular support plate 1221, the first sidewall 1222, and the base column 121 enclose each other to form the receiving cavity 01, providing an independent and stable front cavity acoustic environment for the first sound-generating unit 13. A plurality of through holes 123 are circumferentially distributed on the annular support plate 1221. The annular support plate 1221 not only provides support for the first sound-generating unit 13, but its circumferentially distributed through holes 123 also constitute a channel for sound waves to diffuse from the receiving cavity 01 to the outer side acoustic cavity 02, which is beneficial for the uniform convergence of sound waves. These through holes 123 not only serve as sound wave guides, uniformly channeling the sound waves from the receiving cavity 01 into the annular side sound cavity 02, but also, due to the design of the aperture and distribution density of the multiple through holes 123, create an acoustic impedance effect, which has a certain sound pressure focusing effect on mid-to-low frequency sound waves, thereby enhancing the power and depth of low frequencies.

[0043] like Figure 2 and Figure 7As shown, in this embodiment, the first sound-generating unit 13 is mainly responsible for generating mid-to-low frequency sound waves, and it includes a magnetic block 131, a washer block 132 and a diaphragm assembly 133 arranged sequentially from the inside to the outside; in this embodiment, the diaphragm assembly 133 can be a speaker module in the prior art. The magnetic block 131, washer block 132, and diaphragm assembly 133 are coaxially arranged. The magnetic block 131 provides a magnetic field, and the washer block 132 guides the magnetic lines of force of the magnetic block 131 to the gap of the voice coil of the diaphragm assembly 133. The voice coil of the diaphragm assembly 133 drives the diaphragm to vibrate and produce sound under the action of the electromagnetic field. The sound-producing end of the diaphragm assembly 133 faces the washer block 132, so that the sound waves are first compressed and reflected in the receiving cavity 01, and then released through the through hole 123. This design utilizes the acoustic impedance effect of the cavity to further smooth the frequency response curve of the mid-low frequency range. The exhaust end of the diaphragm assembly 133 faces the corresponding exhaust hole 112, ensuring that the airflow on the back of the diaphragm is smoothly discharged, avoiding the obstruction of diaphragm movement caused by back pressure.

[0044] like Figure 8 As shown, the working principle of the first sound-generating component is based on Fleming's left-hand rule: a current-carrying conductor in a magnetic field experiences electromagnetic force, causing the diaphragm to vibrate and produce sound, thus converting electrical signals into sound signals. Specifically, the voice coil of the diaphragm component 133 is inserted into the annular air gap magnetic field formed by the magnetic block 131 and the washer block 132. Driven by the alternating audio current, it is subjected to force, causing the diaphragm of the diaphragm component to vibrate. The sound waves emitted from the back of the diaphragm flow through the receiving cavity 01 and the through hole 123 into the side sound cavity 02, and finally radiate outward through the sound outlet 111, forming a lateral sound path. In this architecture, since the two sets of first sound-generating units are arranged in opposite directions and their diaphragm vibration directions are opposite, the sound waves are ultimately superimposed in the same direction in the side sound cavity 02, further improving the sound radiation efficiency.

[0045] Furthermore, such as Figure 3 As shown, a limiting step 1223 is provided on the first sidewall 1222. The limiting step 1223 provides positioning support for the outer edge of the diaphragm assembly 133, such as the edge of the diaphragm bracket. This not only facilitates assembly but also ensures the coaxiality of the diaphragm assembly 133 and the base column 121, ensuring uniform magnetic circuit gap.

[0046] This invention integrates the magnetic circuit systems of two first-stage sound-generating units into a single unit using an integrated frame structure. This allows a single frame to support both magnetic circuit systems, achieving coaxial, shared-cavity output from dual mid-low frequency sound sources, significantly enhancing the sound pressure level and energy of the mid-low frequencies. Simultaneously, combined with a second sound-generating unit that directly emits high-frequency signals into the side cavity 02, a three-way acoustic architecture of "dual low-frequency mains + single high-frequency auxiliary" is formed, filling the gap in single-frequency bands. Through meticulous cavity design and sound wave guidance, wide-bandwidth sound waves are perfectly integrated and efficiently radiated within the side cavity.

[0047] In this embodiment, both the upper and lower ends of the base column 121 are provided with coaxially arranged concave cavities 03 that communicate with the corresponding receiving cavity 01; the magnetic block 131 and the washer block 132 are fixed in the concave cavity 03, which greatly saves internal space and makes the overall structure of the speaker more compact; the diaphragm assembly 133 is fixed on the mounting part 122; a gap is provided between the inner sidewall of the concave cavity 03 and the first sound-generating unit 13, forming an acoustic slit, which allows the sound inside the concave cavity 03 to flow through the gap from the through hole 123 to the side sound cavity 02. Through the above structure, the sound waves emitted from the diaphragm must pass through the compression of the slit before flowing to the through hole 123. The slit acts as an "acoustic filter", which can effectively filter out the noise and glitches generated by the mid-low frequency unit in the high frequency range, making the mid-low frequency sound entering the side sound cavity 02 purer.

[0048] Preferably, the opening end face of the cavity 03 is flush with or slightly lower than the end face of the washer block 132, so that the sound waves emitted by the sound-emitting end of the diaphragm assembly 133 can enter the gap smoothly and without obstruction after passing the washer block 132, reducing high-frequency loss and ensuring that the sound waves flow efficiently to the through hole 123.

[0049] like Figure 2 As shown, in this embodiment, the sealed outer cover 11 includes an annular second sidewall 113 and two sealing plates 114 respectively fixed at the upper and lower ends of the second sidewall 113 for sealing the side sound cavity 02 to prevent sound pressure loss caused by sound wave leakage; the sound outlet 111 is disposed opposite to the second sound generating unit 14 on the second sidewall 113, so that the high-frequency sound waves generated by the second sound generating unit 14 can directly radiate to the entire side sound cavity 02 with minimal loss, and then fully intersect and couple with the sound waves emitted by the first sound generating unit 13 before overflowing from the sound outlet 111, realizing the perfect fusion of full-range broadband sound waves at the sound outlet.

[0050] Preferred, such as Figure 4 As shown, the second sound-emitting unit 14 can be positioned within 30 degrees to the left and right of the unit's sound outlet 111. Positioning the second sound-emitting unit 14 within this angle range ensures that its high-frequency sound waves can fully cover the side acoustic cavity and radiate directly to the sound outlet 111 with minimal refraction loss. This angle limitation achieves efficient and wide coverage of high-frequency sound waves, guaranteeing the transparency and positioning of the high-frequency range in the full-range broadband sound generation.

[0051] Furthermore, a positioning protrusion 1131 extending outward is provided on the side of the second sidewall 113 opposite to the sound outlet 111, and the second sound-generating unit 14 is detachably mounted on the positioning protrusion 1131. This positioning protrusion 1131 not only provides a precise positioning reference for the second sound-generating unit 14, ensuring that its sound center is aligned with the center of the sound outlet 111, guaranteeing that high-frequency sound waves fully cover the side cavity before radiating outward from the sound outlet 111; the second sound-generating unit 14 adopts a detachable mounting method common in existing technologies, such as snap-fit ​​or screw connections, facilitating the replacement and tuning of the same or different types of high-frequency units, improving product yield and maintenance convenience.

[0052] In this embodiment, the second sound-generating unit 14 includes a housing 141 and a sound-generating module 142 fixed within the housing 141; the sound-generating module 142 is one of a dynamic coil unit, a balanced armature unit, or a piezoelectric unit. Due to the universal design of the positioning convex ring 1131, the sound-generating module 142 can be flexibly selected according to different acoustic requirements: when a balanced armature unit is used, its extremely high high-frequency sensitivity and transient response can be utilized to obtain sharp and clear high-frequency details; when a piezoelectric unit is used, the ultra-high frequency band can be further extended, increasing the sense of airiness; when a high-frequency dynamic coil unit is used, a softer and more natural high-frequency listening experience can be obtained. This modular design greatly expands the application scenarios of the product. It is worth noting that the dynamic coil unit, balanced armature unit, or piezoelectric unit are all common sound-generating structures in the prior art, and their specific sound-generating principles will not be elaborated further.

[0053] like Figure 2 As shown and Figure 6 As shown, in this embodiment, the sealed outer cover 11 is provided with a tuning mesh 115 at the exhaust port 112 on one side of the two first sound generating units 13, such as the acoustic damping mesh cloth in the prior art, to dampen and adjust the airflow and sound waves discharged from the exhaust port 112 and suppress airflow noise.

[0054] When the first sound unit 13 vibrates at high stroke and low frequency, a large amount of air is pushed out from the exhaust port 112 from its back. Without damping, the high-speed airflow will produce noticeable "wind noise" and "hissing" due to friction with the port wall. When this airflow and sound waves are forced to pass through the tiny pores of the tuning mesh 115, a strong viscous friction effect is generated between the air molecules and the port wall, converting some of the sound energy and airflow energy into a small amount of heat energy that dissipates, thus forming acoustic damping. The tuning mesh 115 buffers the airflow velocity and attenuates the sound wave reflection, effectively suppressing airflow noise and resonance peaks, making the low-frequency response cleaner and more stable, and improving the overall purity of the listening experience.

[0055] On the one hand, in suppressing "wind noise" and distortion: when the diaphragm moves too much, if the exhaust port is fully open, the high-speed airflow will separate at the edge of the port, generating turbulence and eddies, which in turn produces a harsh "puffing" or "hissing" sound (i.e., wind noise). The damping effect of the tuning net 115 is equivalent to adding a "deceleration buffer" to the airflow, effectively smoothing out the sudden change in airflow velocity, breaking the conditions for eddy formation, and thus fundamentally suppressing the generation of wind noise; at the same time, the controlled exhaust airflow avoids the uncontrollable reverse restraint force on the diaphragm caused by the instantaneous and rapid release of air pressure, ensuring that the diaphragm moves precisely according to the electrical signal command, and greatly reducing nonlinear distortion.

[0056] On the other hand, regarding the optimization of the low-frequency resonant frequency (F0) and low-frequency response curve: the low-frequency response of a loudspeaker is highly dependent on the characteristics of the acoustic cavity behind the diaphragm. The acoustic damping provided by the tuning mesh 115, together with the acoustic quality of the vent and the acoustic compliance of the space behind the vent, constitutes an acoustic low-pass filter network. Appropriate damping can effectively reduce the quality factor (Q value) of the resonant system, flattening and widening the originally sharp and narrow resonant peak at F0. This not only avoids the "booming" muddiness (standing wave peaks and valleys) in the low-frequency range, but also makes the low-frequency extension deeper and smoother, the frequency response curve cleaner and smoother, and ultimately significantly improves the low-frequency sound quality performance of compact loudspeakers in a limited space.

[0057] In this embodiment, as Figure 1-2 As shown, the second sidewall 113 is also provided with a voice coil connection PCB 15. The voice coil connection PCB 15 is fixed on the second sidewall 113 and has multiple conductive terminals, which are electrically connected to the voice coil leads of the first sound-generating unit 13 and the voice coil leads of the second sound-generating unit 14, respectively, so as to enable the external audio electrical signal to be electrically connected to any sound-generating unit.

[0058] This invention uses an integrated voice coil connector PCB 15 to centrally guide and fix the leads of the three sound-generating units, which greatly improves the neatness of the internal wiring and the reliability of the electrical connection, avoids the obstruction and abnormal noise caused by messy internal cables to sound waves, and also facilitates the unified plug-in connection of external crossovers or audio input interfaces, thus improving production and assembly efficiency.

[0059] In summary, compared with traditional full-range broadband designs, this invention has the following significant advantages: a) Significantly improved system magnetic circuit efficiency: The integrated coaxial frame eliminates magnetic leakage gaps, allowing for full utilization of the energy of the entire magnetic circuit system. Simulation comparisons (e.g.) Figure 9 As shown in the figure, the electromagnetic efficiency can be improved by more than 15%; under the same magnetic flux conditions, a better sound production effect can be achieved.

[0060] b) Breakthrough in full-range wideband and lateral sound generation: By combining the reverse sound generation of the dual first sound units with the radial sound generation of the second sound unit, and with the coupling effect of the annular side sound cavity, a perfect fusion of mid-low and high frequencies is achieved, breaking the limitations of traditional forward sound generation and realizing a lateral full-range wideband sound field, which is particularly suitable for the acoustic design of ultra-thin electronic devices.

[0061] c) Optimized acoustic path and high radiation efficiency: The pre-designed acoustic path from the housing cavity to the side cavity and then to the sound outlet allows the sound waves to undergo an orderly process of "compression-convergence-coupling-radiation", avoiding sound energy accumulation and offsetting, and significantly improving the sound radiation efficiency and listening performance under the compact structure.

[0062] Example 2: This invention provides a method for omnidirectional broadband sound generation, using the omnidirectional broadband loudspeaker described in Example 1, wherein the method includes the following steps: Step S1: Receive audio electrical signal and drive the two coaxially arranged first sound units to vibrate in opposite directions simultaneously, so that the sound-emitting ends of the two sets of first sound units face each other to generate main sound waves and the exhaust ends face away to generate back sound waves; at the same time, drive the second sound unit to vibrate, so that it directly emits auxiliary sound waves into the annular side sound cavity formed by the two mounting parts, the base column and the sealed outer cover. Specifically, external audio signals are distributed to three sets of sound-generating units via voice coils connected to the PCB. Since the two sets of first sound-generating units are coaxial and facing each other, when their voice coils receive in-phase electrical signals, the vibration directions of the two diaphragms are completely opposite in physical space due to the opposite installation direction (i.e., one vibrates upwards while the other vibrates downwards), but the sound-generating ends of both are facing the inner base column, thus forming a reverse sound-generating structure.

[0063] This reverse vibration causes the mid-to-low frequency main sound waves generated by the two sound-generating ends to superimpose sound pressure in the central region, effectively canceling even-order harmonic distortion and significantly improving the output power and purity of the mid-to-low frequencies. At the same time, the second sound-generating unit is driven by an electrical signal and radiates high-frequency auxiliary sound waves directly into the side cavity radially. Since it does not need to go through a complex guiding path, high-frequency details are preserved to the greatest extent, providing clear high-frequency assurance for full-frequency domain sound generation.

[0064] In step S2, the main sound waves generated by the sound-emitting ends of the two sets of first sound-emitting units first radiate into their respective corresponding receiving cavities, and then flow from the inside to the outside into the annular side sound cavity through multiple through holes arranged circumferentially on the mounting part. The propagation of the main sound wave (mid-low frequency sound wave) undergoes an acoustic phase transition process of "compression-guidance-diffusion". First, the main sound waves radiating in opposite directions are compressed and initially accumulate sound pressure within the narrow cavity, smoothing the frequency response using the acoustic impedance effect of the cavity. Subsequently, the compressed sound waves seek a release path and are forced to overflow outward through multiple circumferentially distributed through holes in the annular support plate. This process not only realizes the convergence of sound waves from independent cavities to a common cavity, but the "acoustic slits" formed by the through holes and the recessed cavity of the base also act as low-pass filters, filtering out unnecessary high-frequency noise generated by the mid-low frequency unit and ensuring that the main sound wave flowing into the side cavity is purer. At the same time, the circumferentially distributed through holes allow the sound waves to flow into the side cavity in a 360-degree annular shape, avoiding the deflection and disorder of the sound field within the cavity caused by a unidirectional sound jet.

[0065] In step S3, the two main sound waves flowing into the side sound cavity are acoustically coupled with the auxiliary sound waves to form a full-frequency sound wave, which then radiates outward through the sound outlet on the sealed outer cover, forming a side sound path. Specifically, the two main sound waves diffuse within the annular side acoustic cavity, where they undergo acoustic convergence and coupling in three-dimensional space with the auxiliary sound waves (high-frequency sound waves) directly radiated into the cavity by the second sound unit. Here, the side acoustic cavity acts as an acoustic "mixing container" and impedance matching network: the mid-to-low frequency main sound waves gain further extension and depth within the annular cavity, while the high-frequency auxiliary sound waves fill the high-frequency gaps that the main sound waves cannot cover. The two are seamlessly connected in phase and sound pressure, merging into a wide-bandwidth full-frequency sound wave. Finally, guided by the side acoustic cavity, this full-frequency sound wave is efficiently radiated radially from the sound outlet to the external environment, forming a lateral sound path. This lateral radiation mode breaks the directional limitations of traditional axial sound emission from loudspeakers, and combined with the sound wave diffusion effect of the annular cavity, it can create a 360-degree surround sound experience within the listening space.

[0066] Step S4: While the main sound wave and the auxiliary sound wave radiate laterally, the back sound waves generated by the exhaust ends of the two sets of first and second sound units are discharged outward through the corresponding exhaust holes to balance the pressure difference between the inside and outside of each sound unit when it vibrates. During sound production, while the front of the diaphragm generates primary / auxiliary sound waves, its back inevitably pushes air to generate back sound waves. Because the internal space of the speaker is relatively sealed, if these back sound waves are not discharged in time, a huge acoustic impedance (i.e., back pressure) will form behind the diaphragm, severely hindering its vibration compliance, leading to difficulty in low-frequency extension and a sharp increase in nonlinear distortion. In this step, the sound waves from the back of the three sound-generating units are discharged outwards through three corresponding exhaust holes on the sealed outer casing, completely releasing the air pressure burden on the back of the diaphragm and ensuring the compliance and linearity of the diaphragm during large-stroke vibration. Furthermore, especially for the exhaust hole of the first sound-generating unit, the high-speed airflow, when passing through the tuning mesh, utilizes the acoustic damping effect of the mesh to generate viscous friction, converting the airflow kinetic energy into heat energy for dissipation. This effectively suppresses turbulent wind noise at the exhaust port and appropriately reduces the Q value of the resonant system, resulting in a more stable, clean, and controlled low-frequency response across the entire frequency range.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A full-range broadband loudspeaker, characterized by, The device includes a sealed outer cover and a basin frame body fixed inside the sealed outer cover. The basin frame body includes a base column, and each end of the base column is provided with a mounting part fixedly connected to the sealed outer cover. A first sound-emitting unit is provided in the receiving cavity of each of the two mounting parts. Both sets of the first sound-emitting units are coaxial with the base column, and the sound-emitting ends of the two sets of the first sound-emitting units are arranged facing each other to form a reverse sound-emitting structure. The two mounting parts, the base column, and the sealed outer cover enclose each other to form an annular side sound cavity. Multiple through holes are provided circumferentially on the mounting parts to connect the receiving cavity and the side sound cavity. The sealed outer cover also has a sound outlet hole connected to the side sound cavity, and a second sound-emitting unit that emits sound towards the side sound cavity. The sealed outer cover has three exhaust holes, each corresponding to one of the two sets of the first sound-emitting units and the second sound unit, for venting sound waves from the back of the first and second sound units to balance the air pressure. The sound emitted by the first sound unit enters the side sound cavity sequentially through the receiving cavity and the through hole, and the sound emitted by the second sound unit directly enters the side sound cavity. The sound waves of the three sets of sound units converge and couple in the side sound cavity to form a full-frequency sound wave. All the sound in the side sound cavity is finally radiated outward through the sound outlet hole, forming a lateral sound path.

2. The wideband loudspeaker according to claim 1, characterized in that, The mounting portion includes an annular support plate extending laterally outward from the outer edge of the base column, and a first sidewall extending longitudinally outward from the outer edge of the annular support plate; the annular support plate, the first sidewall, and the base column enclose each other to form the receiving cavity; a plurality of through holes are circumferentially distributed on the annular support plate.

3. The full-range wideband loudspeaker according to claim 2, characterized in that, The first sound-generating unit includes a magnetic block, a washer block, and a diaphragm assembly arranged sequentially from the inside out; the magnetic block, washer block, and diaphragm assembly are coaxially arranged; the magnetic block is used to provide a magnetic field, the washer block is used to guide the magnetic lines of force of the magnetic block to the voice coil gap of the diaphragm assembly, and the voice coil of the diaphragm assembly drives the diaphragm to vibrate and generate sound under the action of the electromagnetic field; the sound-generating end of the diaphragm assembly faces the washer block, and the exhaust end of the diaphragm assembly faces the corresponding exhaust hole.

4. The full-range wideband loudspeaker according to claim 3, characterized in that, Both ends of the base column are provided with coaxially arranged concave cavities that are connected to the corresponding receiving cavities; the magnet and the washer are fixed in the concave cavities, and the diaphragm assembly is fixed on the mounting part; a gap is provided between the inner wall of the concave cavity and the first sound-generating unit, so that the sound inside the concave cavity flows through the gap from the through hole to the side sound cavity.

5. The full-range wideband loudspeaker according to any one of claims 1-4, characterized in that, The sealed outer cover includes an annular second sidewall and two sealing plates respectively fixed at the upper and lower ends of the second sidewall for sealing the side sound cavity; the sound outlet is disposed on the second sidewall opposite to the second sound-producing unit.

6. The full-range wideband loudspeaker according to claim 5, characterized in that, The second sidewall has an outwardly extending positioning protrusion on the side opposite to the sound outlet, and the second sound-producing unit is detachably mounted on the positioning protrusion.

7. The wideband loudspeaker according to claim 6, characterized in that, The second sound-generating unit includes a housing and a sound-generating module fixed inside the housing; the sound-generating module is one of a moving coil unit, a moving iron unit, or a piezoelectric unit.

8. The wideband loudspeaker according to claim 1, characterized in that, The sealed outer cover is provided with a tuning mesh at the exhaust port on one side of the two first sound generating units, which is used to dampen and adjust the airflow and sound waves discharged from the exhaust port to suppress airflow noise.

9. The wideband loudspeaker according to claim 5, characterized in that, The second sidewall is also provided with a voice coil connection PCB, which is fixed on the second sidewall and has multiple conductive terminals that are electrically connected to the voice coil leads of the first sound-producing unit and the voice coil leads of the second sound-producing unit, respectively, so as to enable external audio electrical signals to be electrically connected to any sound-producing unit.

10. A method for generating sound using a global wideband loudspeaker, employing a global wideband loudspeaker as described in any one of claims 1-9, characterized in that, The method includes the following steps: Step S1: Receive audio electrical signal and drive the two coaxially arranged first sound units to vibrate in opposite directions simultaneously, so that the sound-emitting ends of the two sets of first sound units face each other to generate main sound waves and the exhaust ends face away to generate back sound waves; at the same time, drive the second sound unit to vibrate, so that it directly emits auxiliary sound waves into the annular side sound cavity formed by the two mounting parts, the base column and the sealed outer cover. In step S2, the main sound waves generated by the sound-emitting ends of the two sets of first sound-emitting units first radiate into their respective corresponding receiving cavities, and then flow from the inside to the outside into the side sound cavity through multiple through holes arranged circumferentially on the mounting part. In step S3, the two main sound waves flowing into the side sound cavity are acoustically coupled with the auxiliary sound waves to form a full-frequency sound wave, which then radiates outward through the sound outlet on the sealed outer cover, forming a side sound path. In step S4, while the main sound wave and the auxiliary sound wave radiate laterally, the back sound waves generated by the exhaust ends of the two sets of first and second sound units are discharged outward through the corresponding exhaust holes to balance the pressure difference between the inside and outside of each sound unit when it vibrates.

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