Vibration assembly, micro loudspeaker unit and loudspeaker module

Abstract

The application discloses a vibration assembly, a micro loudspeaker unit and a loudspeaker module. The vibration assembly comprises a voice coil and a main film and a secondary film connected to the voice coil respectively, and the Young's modulus of the secondary film is at least 5 times of the Young's modulus of the main film. The Young's modulus of the secondary film in the vibration assembly is greater than or equal to 5 times of the Young's modulus of the main film, which can significantly increase the high-frequency cutoff frequency FH of the micro loudspeaker unit, thereby improving the acoustic performance of the micro loudspeaker unit.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic converter technology, and more particularly to vibration components, miniature loudspeaker units, and loudspeaker modules. Background Technology

[0002] Today, mobile devices such as smartphones and tablets enrich people's lives, and speakers, as audio devices, play an indispensable role. At the same time, consumers' demands for sound quality are increasing, and correspondingly, designers are raising their performance requirements for speakers.

[0003] Current miniature loudspeaker technology uses a coil driven by a magnetic field to vibrate a diaphragm, which in turn causes the air to vibrate and produce sound. The diaphragm materials of the main and secondary diaphragms in these vibrating components are often the same. Of course, in a very small number of miniature loudspeakers, the diaphragm materials of the main and secondary diaphragms are slightly different, for example, due to differences in adhesive layer thickness. However, overall, in existing vibrating components, the Young's modulus of the main and secondary diaphragms is the same or similar.

[0004] Through research, the inventors discovered that when the Young's modulus of the main diaphragm and the secondary diaphragm are the same or similar, the high-frequency cutoff frequency FH ​​of the electroacoustic transducer is generally too low, which will undoubtedly affect the acoustic performance of the electroacoustic transducer. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a vibration component with good acoustic performance, as well as a miniature speaker unit having the vibration component and a speaker module having the miniature speaker unit.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a vibration component, including a voice coil and a main diaphragm and a secondary diaphragm respectively connected to the voice coil, wherein the Young's modulus of the secondary diaphragm is at least 5 times the Young's modulus of the main diaphragm.

[0007] To solve the above-mentioned technical problems, the second technical solution adopted by the present invention is: a miniature loudspeaker unit, including a frame and a vibration component and a magnetic circuit component respectively disposed on the frame, wherein the vibration component is the aforementioned vibration component, and the main diaphragm and the secondary diaphragm are respectively connected to the frame.

[0008] To solve the above-mentioned technical problems, the third technical solution adopted by the present invention is: a speaker module, including a module housing and a speaker unit at least partially disposed within the module housing, wherein the speaker unit is the aforementioned miniature speaker unit.

[0009] The beneficial effect of the present invention is that the Young's modulus of the secondary diaphragm in the vibration assembly is greater than or equal to 5 times the Young's modulus of the primary diaphragm, which can significantly increase the high-frequency cutoff frequency FH ​​of the micro loudspeaker unit, thereby improving the acoustic performance of the micro loudspeaker unit. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the vibration assembly according to Embodiment 1 of the present invention;

[0011] Figure 2 The simulation results of the mode shape of the control group at the resonance frequency F0 = 373.3 Hz in the simulation experiment of Embodiment 1 of the present invention are shown.

[0012] Figure 3 The simulation results of the mode shape of the control group at the high-frequency cutoff frequency FH ​​= 6894.3Hz in the simulation experiment of Embodiment 1 of the present invention are shown.

[0013] Figure 4 The simulation results of the vibration mode of experimental group 2 at the high-frequency cutoff frequency FH ​​= 6894.3Hz are shown in the simulation experiment of embodiment 1 of the present invention.

[0014] Label Explanation:

[0015] 1. Main membrane;

[0016] 2. Secondary membrane;

[0017] 3. Voice coil. Detailed Implementation

[0018] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0019] Please refer to Figures 1 to 4 The vibrating assembly includes a voice coil 3 and a main diaphragm 1 and a secondary diaphragm 2 connected to the voice coil 3 respectively, wherein the Young's modulus of the secondary diaphragm 2 is at least 5 times the Young's modulus of the main diaphragm 1.

[0020] As can be seen from the above description, the beneficial effect of the present invention is that the Young's modulus of the secondary diaphragm 2 in the vibration assembly is greater than or equal to 5 times the Young's modulus of the main diaphragm 1, which can significantly increase the high-frequency cutoff frequency FH ​​of the micro loudspeaker unit, thereby improving the acoustic performance of the micro loudspeaker unit.

[0021] Furthermore, the Young's modulus of the secondary membrane 2 is at least 10 times that of the Young's modulus of the primary membrane 1.

[0022] As can be seen from the above description, when the Young's modulus of the sub-diaphragm 2 in the vibration assembly is greater than or equal to 10 times the Young's modulus of the main diaphragm 1, the FH can be increased by more than 100 Hz, which is a significant effect. Moreover, under the premise of ensuring F0, the sub-diaphragm 2 can maintain a large thickness, which is durable and effectively ensures the service life of the vibration assembly.

[0023] Furthermore, the Young's modulus of the secondary membrane 2 is at least 20 times that of the Young's modulus of the primary membrane 1.

[0024] Furthermore, the Young's modulus of the secondary membrane 2 is at least 100 times that of the Young's modulus of the primary membrane 1.

[0025] Furthermore, the main membrane 1 is a single-layer structure or a multi-layer composite structure.

[0026] Furthermore, the sub-membrane 2 is a single-layer structure or a multi-layer composite structure.

[0027] As can be seen from the above description, the specific structures of the main membrane 1 and the secondary membrane 2 can be set as needed.

[0028] A miniature loudspeaker unit includes a frame and a vibration component and a magnetic circuit component respectively disposed on the frame. The vibration component is the aforementioned vibration component. The main diaphragm 1 and the secondary diaphragm 2 are respectively connected to the frame.

[0029] A speaker module includes a module housing and a speaker unit at least partially disposed within the module housing, wherein the speaker unit is the aforementioned miniature speaker unit.

[0030] Example 1

[0031] Please refer to Figures 1 to 4 One embodiment of the present invention is a speaker module, which is applied to electronic devices that can emit sound, such as mobile phones, speakers, tablet computers, laptops, smartwatches, walkie-talkies, portable game consoles, etc.

[0032] The speaker module includes a module housing and a speaker unit at least partially disposed within the module housing, preferably a miniature speaker unit. It should be noted that in some electronic devices, the speaker module may not have a separate speaker housing. In such cases, the electronic device may utilize its own housing as a speaker housing to achieve multiple functions, or the electronic device may construct a region within its own housing that serves the same function as a speaker housing. When this occurs, the electronic device's own housing should be considered as the module housing.

[0033] The miniature loudspeaker unit includes a frame and a resonating assembly and a magnetic circuit assembly respectively disposed on the frame, such as Figure 1As shown, the vibration assembly includes a voice coil 3 and a main diaphragm 1 and a secondary diaphragm 2 connected to the voice coil 3. The main diaphragm 1 and the secondary diaphragm 2 are respectively connected to the frame. The magnetic circuit assembly is used to construct a working magnetic field for the voice coil 3. The main diaphragm 1 is the main component of the miniature loudspeaker unit used to drive air vibration to produce sound; the secondary diaphragm 2 is a supporting component in the miniature loudspeaker unit used to correct the polarization of the voice coil 3 and improve the polarization and roll vibration phenomena of the voice coil 3.

[0034] It should be noted that the main diaphragm 1 and the voice coil 3 can be directly connected or indirectly connected. A direct connection means the voice coil 3 is in direct contact with the main diaphragm 1. An indirect connection means the voice coil 3 and the main diaphragm 1 are connected by a component that connects the voice coil 3 and the main diaphragm 1 respectively. For example, in some miniature loudspeaker units, the vibrating assembly also includes a centering plate fixed to the main diaphragm 1. In this case, the voice coil 3 can be indirectly connected to the main diaphragm 1 through the centering plate. Similarly, the main diaphragm 1 and the frame can be directly connected or indirectly connected. For example, in some miniature loudspeakers, the frame and the main diaphragm 1 are indirectly connected through a centering support. It is easily understood that the connection between the secondary diaphragm 2 and the voice coil 3 and the frame can also be set to be either directly or indirectly connected.

[0035] Furthermore, the main membrane 1 can be either a single-layer structure or a multi-layer composite structure. When the main membrane 1 is a single-layer structure, it has only one membrane material layer; when the main membrane 1 is a multi-layer composite structure, it includes at least two membrane material layers, wherein adjacent membrane material layers are bonded together by methods such as adhesive bonding, pressing, spraying, printing, electroplating, or sputtering. Similarly, the secondary membrane 2 can be either a single-layer structure or a multi-layer composite structure.

[0036] The Young's modulus of the sub-diaphragm 2 in the vibration assembly is at least 5 times that of the Young's modulus of the main diaphragm 1. Preferably, the Young's modulus of the sub-diaphragm 2 is at least 10 times that of the main diaphragm 1; more preferably, the Young's modulus of the sub-diaphragm 2 is at least 20 times that of the main diaphragm 1. Of course, it is also feasible for the Young's modulus of the sub-diaphragm 2 to be at least 100 times or 400 times that of the main diaphragm 1.

[0037] The inventors conducted the following simulation experiments, and the simulation results are shown in Table 1 below:

[0038] Control group: The main membrane 1 has a Young's modulus of 100 MPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 50 μm; the secondary membrane 2 has a Young's modulus of 100 MPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 50 μm. Figure 2The image shows the mode shape simulation results for the control group at a resonant frequency F0 = 373.3 Hz. Figure 3 The figure shows the mode shape simulation results of the control group at the high-frequency cutoff frequency FH ​​= 6894.3Hz.

[0039] Experimental group 1: The main membrane 1 has a Young's modulus of 100 MPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 50 μm; the secondary membrane 2 has a Young's modulus of 500 MPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 26.5 μm.

[0040] Experimental Group 2: The main membrane 1 has a Young's modulus of 100 MPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 50 μm; the secondary membrane 2 has a Young's modulus of 1 GPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 20.5 μm. Figure 4 The figure shows the mode shape simulation results of Experiment Group 2 at the high-frequency cutoff frequency FH ​​= 7000.3Hz.

[0041] Experimental Group 3: The main membrane 1 has a Young's modulus of 100 MPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 50 μm; the secondary membrane 2 has a Young's modulus of 2 GPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 15.8 μm.

[0042] Experimental Group 4: The main membrane 1 has a Young's modulus of 100 MPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 50 μm; the secondary membrane 2 has a Young's modulus of 10 GPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 8.8 μm.

[0043] Experimental Group 5: The main membrane 1 has a Young's modulus of 100 MPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 50 μm; the secondary membrane 2 has a Young's modulus of 40 GPa, a density of 1200 kg / m^3, a Poisson's ratio of 0.4, and a thickness of 5.4 μm.

[0044] Table 1 Simulation Results

[0045] control group Experimental Group 1 Experimental Group 2 Experimental Group 3 Experimental Group 4 Experimental Group 5 Young's modulus of the secondary membrane 100MPa 500MPa 1GPa 2GPa 10GPa 40GPa Sub-film thickness (µm) 50 26.5 20.5 15.8 8.8 5.4 F0(Hz) 373.3 373.3 373.3 373.4 373.3 373.5 FH (Hz) 6894.3 6967.7 7000.3 7043.6 7265.9 7833.6 FH increases (Hz) 73.4 106 149.3 371.6 939.3

[0046] It should be noted that in the above experimental group, the reason why the thickness of the secondary membrane 2 gradually decreases as the Young's modulus of the secondary membrane 2 increases is to ensure that the resonant frequency F0 remains basically unchanged.

[0047] The simulation results above show that...

[0048] When the Young's modulus of the secondary membrane 2 is 5 times that of the Young's modulus of the primary membrane 1, FH shows a significant increase, increasing by 73.4 Hz.

[0049] When the Young's modulus of the secondary diaphragm 2 is 10 times that of the primary diaphragm 1, the increase in FH is more significant, exceeding 100Hz. At this point, the vibrating component can respond over a wider range, effectively improving the acoustic performance of the miniature loudspeaker unit. Furthermore, the thickness of the secondary diaphragm 2 can be maintained at 20.5µm, thus balancing the lifespan and performance of the miniature loudspeaker unit.

[0050] When the Young's modulus of the sub-diaphragm 2 is 20 times that of the Young's modulus of the main diaphragm 1, the FH increases by nearly 150 Hz. Moreover, the thickness of the sub-diaphragm 2 can still be maintained at 15.8 μm, which can still take into account the service life and performance of the micro loudspeaker unit.

[0051] When the Young's modulus of the secondary diaphragm 2 is 100 times that of the primary diaphragm 1, the FH increases by 371.6 Hz, which greatly improves the performance of the miniature loudspeaker unit.

[0052] When the Young's modulus of the secondary membrane 2 was 40 GPa, the FH reached 7833.6 Hz, which was 939.3 Hz higher than that of the control group.

[0053] It can be seen that the larger the Young's modulus of the secondary membrane 2 is than that of the primary membrane 1, the more obvious the difference in FH, and the greater the increase in FH.

[0054] This simulation experiment demonstrates that by designing a main diaphragm 1 and a secondary diaphragm 2 made of different materials, and with the Young's modulus of the secondary diaphragm 2 being greater than or equal to five times or more the Young's modulus of the main diaphragm 1, the FH of the vibrating component can be increased while keeping F0 constant, thereby improving the acoustic performance of the miniature loudspeaker.

[0055] In summary, the vibration component, miniature loudspeaker unit, and loudspeaker module provided by this invention have a Young's modulus of the secondary diaphragm that is greater than or equal to five times the Young's modulus of the primary diaphragm. This can significantly increase the high-frequency cutoff frequency FH ​​of the miniature loudspeaker unit, thereby improving the acoustic performance of the miniature loudspeaker unit.

[0056] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention's specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A vibrating assembly, comprising a voice coil and a main diaphragm and a secondary diaphragm respectively connected to the voice coil, characterized in that: The Young's modulus of the sub-membrane is 5, 10, 20, 100, or 400 times that of the Young's modulus of the main membrane; as the Young's modulus of the sub-membrane increases, the thickness of the sub-membrane gradually decreases.

2. The vibration assembly according to claim 1, characterized in that: The main membrane is a single-layer structure or a multi-layer composite structure.

3. The vibration assembly according to claim 1, characterized in that: The submembrane can be a single-layer structure or a multi-layer composite structure.

4. A miniature loudspeaker unit, comprising a frame and a resonating assembly and a magnetic circuit assembly respectively disposed on the frame, characterized in that: The vibration assembly is the vibration assembly described in any one of claims 1-3, and the main diaphragm and the secondary diaphragm are respectively connected to the basin frame.

5. A loudspeaker module, comprising a module housing and a loudspeaker unit at least partially disposed within the module housing, characterized in that: The loudspeaker unit is the miniature loudspeaker unit as described in claim 4.

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