Vibrating diaphragm, sound production unit and audio equipment

Abstract

The invention provides a vibrating diaphragm, a sound production unit and audio equipment. The vibrating diaphragm comprises a first mounting wing, a second mounting wing and a folding unit formed by continuous bending, the folding units form a plurality of folding spaces, and folding plates are formed on the two sides of the folding spaces. The tops of the two ends of the folding unit are arranged on a first plane, the top of the center of the folding unit is arranged on a second plane, and a first distance is formed between the first plane and the second plane; the distance between the folding plates on the two sides of the folding space changes along with the length of the folding units. The sound production unit comprises a first support, a magnet, a second support, a damping net and a damping plate. The loudspeaker also comprises the vibrating diaphragm of the above implementation mode. The first mounting wing and the second mounting wing are arranged on the first bracket and between the first bracket and the magnet; the audio equipment comprises a sound production unit. The vibrating diaphragm, the sound production unit and the audio equipment provided by the invention make up the defect of weak low-frequency performance in the prior art, and realize full-band balanced sound production.

Description

A diaphragm, a sound-generating unit, and an audio device Technical Field

[0001] This invention relates to the field of audio equipment technology, and in particular to a diaphragm, a sound-generating unit, and an audio device. Background Technology

[0002] AMT (Air Motion Transformer) is a sound-generating component developed in the 1960s. Its core structure is a multi-segment folded component formed by precisely folding a thin film covering a special metal coil. With its extremely thin and light diaphragm characteristics, it can achieve an effective sound-generating area with only a small vibration. It has the advantages of wide frequency range extension and good transient response in the high-frequency range and is widely used in audio equipment as a high-frequency sound-generating unit.

[0003] As the "sound-generating heart" of an audio device, this unit's core working logic involves driving a diaphragm to vibrate via electrical signals, propelling air to form sound waves that are transmitted to the ear. However, existing AMT (Automated Manual Transmission) pneumatic sound units consist of multiple folded units. Due to structural limitations, the equivalent resonant frequencies of these folded units are concentrated, and their vibration phases are close, especially forming sharp peaks and valleys in the 6-10 kHz frequency range. Furthermore, the effective area for low-frequency vibration is insufficient, resulting in a masking effect. This makes the mid-high frequency performance overly prominent while the low frequency performance is weak, preventing it from being used as a standalone full-range sound unit. This problem severely limits its application scenarios, requiring the use of an additional mid-low frequency sound unit, which increases product costs and affects portability and user experience. Summary of the Invention

[0004] The purpose of this invention is to provide a diaphragm, a sound-generating unit, and an audio device that can solve the aforementioned technical problems. This invention provides a diaphragm comprising: a first mounting wing and a second mounting wing; and a continuously bent folding unit disposed between the first mounting wing and the second mounting wing; the folding unit forms a plurality of folding spaces, and folding plates are formed on both sides of the folding spaces; the tops of both ends of the folding unit are placed on a first plane, and the top of the center of the folding unit is placed on a second plane, with a first distance formed between the first plane and the second plane; wherein the spacing between the folding plates on both sides of the folding spaces varies with the length of the folding unit.

[0005] According to one embodiment of the present invention, a plurality of folding spaces include a first folding segment, a second folding segment, and a third folding segment; the second folding segment is disposed between the first folding segment and the third folding segment.

[0006] According to one embodiment of the present invention, the second distance between the folding plates on both sides of the folding space in the first folding segment and the third folding segment is equal; the third distance between the folding plates on both sides of the folding space in the second folding segment is greater than the second distance.

[0007] According to one embodiment of the present invention, the fourth distance between the folding plates on both sides of the folding space in the second folding segment and the third folding segment is equal, and the fourth distance is greater than the fifth distance between the folding plates on both sides of the folding space in the first folding segment.

[0008] According to one embodiment of the present invention, the sixth distance between the folding plates on both sides of the folding space in the first folding segment and the second folding segment is equal, and the sixth distance is greater than the seventh distance between the folding plates on both sides of the folding space in the third folding segment.

[0009] According to one embodiment of the present invention, the folding space includes folding plates on both sides and bending plates, with the bending plates placed between the folding plates on both sides.

[0010] According to one embodiment of the present invention, the top of the bending plates in the folding unit is all arranged on an arc.

[0011] The present invention also provides a sound generating unit, including: a first bracket, a magnet, a second bracket, a damping mesh and a damping plate; and further including: the diaphragm of the above embodiment; a first mounting wing and a second mounting wing are disposed on the first bracket and placed between the first bracket and the magnet.

[0012] According to one embodiment of the present invention, a plurality of limiting protrusions are provided on the first bracket, and the limiting protrusions are adapted to the folding space.

[0013] The present invention also provides an audio device, including the sound-generating unit of the above embodiments.

[0014] The technical solution of this invention adapts the spacing between the folding plates on both sides of the diaphragm folding unit to the length of the folding unit, thereby breaking up the equivalent resonant frequencies of each folding space, avoiding excessively close vibration phases, effectively eliminating sharp peaks and valleys in the 6-10 kHz frequency band, and optimizing the smoothness of high-frequency listening. At the same time, it creates a high-low plane spacing between the two ends of the folding unit and the top center, increasing the effective area for low-frequency vibration of the diaphragm, structurally improving the low-frequency masking effect, making up for the weakness of low-frequency performance in existing technologies, and achieving balanced sound across the entire frequency band.

[0015] In addition, the technical solution of the present invention does not require an additional mid-to-low frequency sound unit, which greatly simplifies the structural design of audio equipment, effectively reduces product manufacturing costs, and at the same time reduces the size and weight of the sound unit, improving the portability and user experience of audio equipment, and significantly expanding the application scenarios of AMT pneumatic sound unit. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 is a structural schematic diagram of a diaphragm according to the present invention; Figure 2 is a perspective view of a diaphragm according to the present invention; Figure 3 is a structural schematic diagram of a first embodiment of a diaphragm according to the present invention; Figure 4 is a structural schematic diagram of a second embodiment of a diaphragm according to the present invention; Figure 5 is a structural schematic diagram of a third embodiment of a diaphragm according to the present invention; Figure 6 is an exploded view of a sound-generating unit according to the present invention from a first perspective; Figure 7 is an exploded view of a sound-generating unit according to the present invention from a second perspective.

[0018] Explanation of reference numerals in the attached drawings: 101-First mounting wing; 102-Second mounting wing; 200-Folding unit; 201-Folding space; 202-Folding plate; 203-Bending plate; 301-First bracket; 311-Limiting protrusion; 302-Magnet; 303-Second bracket; 304-Damping mesh; 305-Damping plate; 401-First folding section; 402-Second folding section; 403-Third folding section; M1-First plane; M2-Second plane; H1-First distance; H2-Second distance; H3-Third distance; H4-Fourth distance; H5-Fifth distance; H6-Sixth distance; H7-Seventh distance; A-Arc. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] As shown in Figures 1-5, the diaphragm proposed in this invention includes: a first mounting wing 101 and a second mounting wing 102; and a continuously bent folding unit 200 is provided between the first mounting wing 101 and the second mounting wing 102; the folding unit 200 forms a plurality of folding spaces 201, and folding plates 202 are formed on both sides of the folding spaces 201; the tops of both ends of the folding unit 200 are placed on a first plane M1, and the top of the center of the folding unit 200 is placed on a second plane M2, and a first distance H1 is formed between the first plane M1 and the second plane M2; wherein, the spacing between the folding plates 202 on both sides of the folding spaces 201 varies with the length of the folding unit 200; in this invention, the first distance H1 is between 0.4 and 0.6 mm, preferably 0.5 mm.

[0023] The first mounting wing 101 and the second mounting wing 102 are integrally formed with the folding unit 200, and are bent after forming to create the first mounting wing 101, the second mounting wing 102, and the folding unit 200. The first mounting wing 101, the second mounting wing 102, and the folding unit 200 are made of an ultra-thin composite polymer film or metal film, integrally formed by hot pressing and bending, with a film thickness of 0.01~0.05 mm. mm ensures the lightweight and vibration toughness of the diaphragm; in addition, during the molding of the folding unit 200, a folding space 201 is formed at each bending position, and folding plates 202 are formed on both sides of the folding space 201. At the same time, during the molding of the folding unit 200, it is also necessary to make the folding unit 200 concave after molding, that is, the two ends of the folding unit 200 are placed on the first plane M1, and the center of the folding unit 200 is placed on the second plane M2. Since the distance between the folding plates 202 varies with the length of the folding unit 200, and the folding unit 200 has a concave structure, the equivalent resonant frequency of each folding space 201 can be dispersed during use, thereby eliminating the sharp peaks and valleys in the 6~10 kHz frequency band, optimizing the smoothness of high-frequency listening, and increasing the effective vibration area, making it suitable for different frequency bands.

[0024] Specifically, the sound pressure response can be calculated using the following formula: Where SPL(f) is the sound pressure level; f is the excitation frequency; f i Let A be the natural frequency of the i-th vibration mode; i ζ represents the amplitude of the i-th mode; ζ is the damping coefficient.

[0025] In the prior art, the diaphragm is uniformly folded, and its structure results in the equivalent resonant frequency (f) of the multiple folded units 200 on the diaphragm. i ) is very close to the system's natural frequency (f0), i.e., f i ≈f0. ; When the excitation frequency f is close to these concentrated natural frequencies, the vibration phases of each mode are close, and their amplitudes (A) are close. i Coherent superposition will occur; the result of coherent superposition is that in a specific frequency band (such as 6~10 kHz), the total sound pressure level (SPL) will increase sharply, forming one or more very sharp peaks (SPLpeak∝N, where N is the number of modes involved in superposition), resulting in a harsh and unstable sound in that frequency band.

[0026] The technical solution of this invention, through the structure of the folding unit 200, enables the folding spaces 201 at different positions on the diaphragm to have different equivalent stiffness and mass distributions, thereby resulting in the equivalent resonant frequency (f) of the folding space 201. i ) is effectively broken down and dispersed; due to the natural frequencies (f) of each mode. iThe vibration phases of each mode are no longer completely synchronized when excited by the same frequency f. The superposition of their amplitudes changes from coherent superposition to incomplete coherent superposition. Incomplete coherent superposition disperses the energy that was originally concentrated near a single frequency to a wider frequency range, thereby effectively reducing the quality factor (Q value) of the main peak and widening the effective frequency response bandwidth of the folded unit 200. This makes the peaks and valleys in the 6~10 kHz frequency band significantly lower and no longer sharp, and greatly improves the stability and comfort of high-frequency listening.

[0027] The technical solution of this invention adapts the spacing of the folding plates 202 on both sides of the diaphragm folding unit 200 to the length of the folding unit 200, thereby breaking up the equivalent resonant frequencies of each folding space 201, avoiding excessively close vibration phases, effectively eliminating sharp peaks and valleys in the 6~10 kHz frequency band, and optimizing the smoothness of high-frequency listening. At the same time, it makes the two ends of the folding unit 200 and the center top form a high-low plane spacing, increasing the effective area of ​​the diaphragm for low-frequency vibration, structurally improving the low-frequency masking effect, making up for the weakness of low-frequency performance in the prior art, and achieving balanced sound across the entire frequency band.

[0028] In addition, the technical solution of the present invention does not require an additional mid-to-low frequency sound unit, which greatly simplifies the structural design of audio equipment, effectively reduces product manufacturing costs, and at the same time reduces the size and weight of the sound unit, improving the portability and user experience of audio equipment, and significantly expanding the application scenarios of AMT pneumatic sound unit.

[0029] According to one embodiment of the present invention, a plurality of folding spaces 201 include a first folding segment 401, a second folding segment 402, and a third folding segment 403; the second folding segment 402 is disposed between the first folding segment 401 and the third folding segment 403; the dimensions of the folding spaces 201 in the first folding segment 401, the second folding segment 402, and the third folding segment 403 can be adjusted during the molding stage as needed. Example 1:

[0030] As shown in Figure 3, the second distance H2 between the folding plates 202 on both sides of the folding space 201 in the first folding segment 401 and the third folding segment 403 is equal; the third distance H3 between the folding plates 202 on both sides of the folding space 201 in the second folding segment 402 is greater than the second distance H2. Specifically, the first folding segment 401 and the third folding segment 403 have the same structure, and the folding plates 202 form a second distance H2, while the folding plates 202 in the second folding segment 402 form a third distance H3, and the third distance H3 is greater than the second distance H2. For example, the third distance H3 is 0.8 mm, and the second distance H2 is 0.48 mm. This makes the bending positions of the first folding segment 401, the second folding segment 402, and the third folding segment 403 change. Example 2:

[0031] As shown in Figure 4, the fourth distance H4 between the folding plates 202 on both sides of the folding space 201 in the second folding segment 402 and the third folding segment 403 is equal, and the fourth distance H4 is greater than the fifth distance H5 between the folding plates 202 on both sides of the folding space 201 in the first folding segment 401. Specifically, the fourth distance H4 formed after the bending of the second folding segment 402 and the third folding segment 403 is equal, and the fifth distance H5 is formed between the folding plates 202 of the first folding segment 401, and the fourth distance H4 is greater than the fifth distance H5, such as the fourth distance H4 being 0.8 mm and the fifth distance H5 being 0.48 mm. This makes the bending positions of the first folding segment 401, the second folding segment 402, and the third folding segment 403 change. Example 3:

[0032] As shown in Figure 5, the sixth distance H6 between the folding plates 202 on both sides of the folding space 201 in the first folding segment 401 and the second folding segment 402 is equal, and the sixth distance H6 is greater than the seventh distance H7 between the folding plates 202 on both sides of the folding space 201 in the third folding segment 403. Specifically, the sixth distance H6 formed after the bending of the first folding segment 401 and the second folding segment 402 is equal, and the seventh distance H7 is formed between the folding plates 202 in the third folding segment 403. The sixth distance H6 is greater than the seventh distance H7, such as the sixth distance H6 being 0.8 mm and the seventh distance H7 being 0.48 mm. This makes the bending positions of the first folding segment 401, the second folding segment 402 and the third folding segment 403 change.

[0033] Of course, in addition to the structures of the first folding segment 401, the second folding segment 402 and the third folding segment 403 in the above embodiments, other structures are also possible, such as the staggered changes in the distance between the folding plates 202 in the first folding segment 401, the second folding segment 402 and the third folding segment 403. The specific structure shall be subject to the actual situation, and the present invention will not further limit it.

[0034] In this invention, the folding space 201 includes folding plates 202 on both sides and bending plates 203. The bending plates 203 are positioned between the folding plates 202 on both sides. The tops of the bending plates 203 in the folding unit 200 are all positioned on an arc A with the center of the folding unit 200 as a reference. This makes the folding unit 200 have a concave structure, which, during use, can disperse the equivalent resonant frequencies of each folding space 201, thereby eliminating 6~10... The sharp peaks and valleys in the kHz frequency band; the concave structure accounts for 8% of the total volume of the folding unit 200, which can effectively disperse the equivalent resonant frequencies of each folding space 201 without affecting the overall structural strength. Specifically, the volume of the concave structure is 8% of the total projected volume of the folding unit, calculated according to the three-dimensional projected volume of the folding unit. In addition, the concave structure physically increases the effective vibration area of ​​the folding unit 200 under low-frequency drive, thereby improving the radiation efficiency of low-frequency sound pressure. At the same time, the concave structure helps to guide the folding unit 200 to vibrate more like a piston at low frequencies, reducing segmented vibration, thereby improving the flatness and strength of the low-frequency response and effectively alleviating the low-frequency masking effect in the prior art.

[0035] As shown in Figures 6-7, the present invention also provides a sound generating unit, including: a first bracket 301, a magnet 302, a second bracket 303, a damping mesh 304 and a damping plate 305; and also including: the diaphragm of the above embodiment; a first mounting wing 101 and a second mounting wing 102 are disposed on the first bracket 301 and placed between the first bracket 301 and the magnet 302.

[0036] Specifically, the first mounting wing 101 and the second mounting wing 102 are mounted on the first bracket 301, and the magnet 302 and the diaphragm are constrained between the first bracket 301 and the second bracket 303 by the second bracket 303. The second bracket 303 is provided with a mounting groove, and the magnet 302 is placed in the mounting groove, thereby limiting the position of the magnet 302 and preventing displacement of the magnet 302. The damping mesh 304 and the damping plate 305 are sequentially mounted on the second bracket 303. It should be noted that the first bracket 301 and the second bracket 303 are detachably connected by snap-fit ​​or screws, and the damping mesh 304 and the damping plate 305 are fixed to the second bracket 303 by adhesive bonding, thereby ensuring the structural stability of the sound unit, and the detachable connection method of snap-fit ​​or screws facilitates disassembly and maintenance.

[0037] In this invention, a magnet 302 is provided on one side of the diaphragm, which can reduce the overall volume and weight while ensuring that the magnetic field strength meets the vibration requirements of the diaphragm across the entire frequency range. The damping mesh 304 and the damping plate 305 work together to form a dual damping adjustment, further optimizing the acoustic environment inside the unit, suppressing sound wave standing waves, and improving the flatness of the mid-frequency response. Furthermore, the damping mesh 304 can adjust the internal air pressure between the first support 301 and the second support 303, suppressing excessive diaphragm vibration and avoiding low-frequency distortion. It also filters dust and other impurities, protecting the diaphragm and the magnet 302. The damping mesh 304 is a metal wire mesh or a synthetic fiber mesh with a mesh size of 80-120. The damping plate 305 is a porous plastic plate or a metal plate with a thickness of 0.5-1 mm and an opening rate of 20%-30%.

[0038] In addition, the first support 301 is provided with a number of limiting protrusions 311, which are adapted to the folding spaces 201. When the diaphragm is placed on the first support 301, the folding spaces 201 are respectively placed in the limiting protrusions 311. The limiting protrusions 311 support the folding spaces 201 to ensure that the diaphragm maintains the preset shape during vibration and avoids displacement or deformation during vibration. Specifically, the height of the limiting protrusions 311 is 1 / 2 to 2 / 3 of the depth of the folding space 201, and the width matches the distance between the folding plates 202 on both sides of the folding space 201 to avoid the limiting protrusions 311 from hindering the normal vibration of the diaphragm. The number of limiting protrusions 311 is adapted to the number of folding spaces 201, and the specific number is subject to the actual situation. This invention will not further limit the number of limiting protrusions 311.

[0039] The present invention also provides an audio device, including the sound-generating unit of the above embodiments; in the present invention, the audio device may be headphones or speakers, etc., and the size of the sound-generating unit can be adjusted proportionally according to the device requirements. The specific requirements shall prevail, and the present invention will not further limit it.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A diaphragm, characterized in that, include: A first mounting wing (101) and a second mounting wing (102); and a continuously bent folding unit (200) is provided between the first mounting wing (101) and the second mounting wing (102); and the folding unit (200) forms a plurality of folding spaces (201), and folding plates (202) are formed on both sides of the folding spaces (201); the tops of both ends of the folding unit (200) are placed on a first plane (M1), the top of the center of the folding unit (200) is placed on a second plane (M2), and a first distance (H1) is formed between the first plane (M1) and the second plane (M2); wherein, the spacing between the folding plates (202) on both sides of the folding space (201) varies with the length of the folding unit (200).

2. The diaphragm according to claim 1, characterized in that, The plurality of folded spaces (201) include a first folded segment (401), a second folded segment (402) and a third folded segment (403); the second folded segment (402) is located between the first folded segment (401) and the third folded segment (403).

3. The diaphragm according to claim 2, characterized in that, The second distance (H2) between the folding plates (202) on both sides of the folding space (201) in the first folding segment (401) and the third folding segment (403) is equal; the third distance (H3) between the folding plates (202) on both sides of the folding space (201) in the second folding segment (402) is greater than the second distance (H2).

4. The diaphragm according to claim 2, characterized in that, The fourth distance (H4) between the folding plates (202) on both sides of the folding space (201) in the second folding segment (402) and the third folding segment (403) is equal, and the fourth distance (H4) is greater than the fifth distance (H5) between the folding plates (202) on both sides of the folding space (201) in the first folding segment (401).

5. The diaphragm according to claim 2, characterized in that, The sixth distance (H6) between the folding plates (202) on both sides of the folding space (201) in the first folding segment (401) and the second folding segment (402) is equal, and the sixth distance (H6) is greater than the seventh distance (H7) between the folding plates (202) on both sides of the folding space (201) in the third folding segment (403).

6. The diaphragm according to claim 1, characterized in that, The folding space (201) includes folding plates (202) on both sides and a bending plate (203), with the bending plate (203) positioned between the folding plates (202) on both sides.

7. The diaphragm according to claim 6, characterized in that, The top of the bending plate (203) in the folding unit (200) is set on the arc (A).

8. A sound-generating unit, characterized in that, include: The first bracket (301), magnet (302), second bracket (303), damping mesh (304), and damping plate (305) are further comprising: a diaphragm as described in any one of claims 1-7; the first mounting wing (101) and the second mounting wing (102) are disposed on the first bracket (301) and positioned between the first bracket (301) and the magnet (302).

9. The sound-generating unit according to claim 8, characterized in that, The first bracket (301) is provided with a plurality of limiting protrusions (311), which are adapted to the folding space (201).

10. An audio device, characterized in that, Includes the sound-generating unit as described in any one of claims 8-9.

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