Dual-sounding loudspeaker

Abstract

The invention relates to the technical field of loudspeakers, in particular to a dual-sounding loudspeaker which comprises a first sounding unit and a second sounding unit. The first sound production unit comprises a support and a loudspeaker diaphragm arranged on the support, and the second sound production unit comprises a piezoelectric sound production device; the piezoelectric sounding device is attached to the surface of the loudspeaker diaphragm. According to the loudspeaker, the high-frequency-band sound production quality can be improved, the size of the whole loudspeaker can be effectively reduced, and miniaturization design can be conveniently achieved.

Description

Technical Field

[0001] The present application relates to the technical field of loudspeakers, and in particular to a dual-sounding loudspeaker. Background Art

[0002] Traditional dynamic and balanced iron speakers have good sound effects and outstanding timbre in the mid- and low-frequency bands, but in the high-frequency band greater than 6kHz, the sound quality of traditional speakers is severely attenuated, and cannot bring users a good overtone experience. Speaker devices based on piezoelectric diaphragms have obvious advantages in sound production in high-frequency bands. Therefore, the dual sound units proposed by some manufacturers currently combine the advantages of dynamic, balanced iron speakers and piezoelectric speakers. The dual sound units of the prior art structurally form a first sound cavity and a second sound cavity, wherein the first sound cavity is used to accommodate a traditional speaker, and the second sound cavity is used to accommodate a piezoelectric speaker. This design greatly increases the volume of the sound module as a whole, which is not conducive to achieving a miniaturized design, and will ultimately have an adverse effect on the integration of the speaker into terminal devices such as mobile phones. Summary of the invention

[0003] The purpose of the present application is to provide a dual-sound speaker, which can not only improve the sound quality in the high-frequency band, but also effectively reduce the volume of the entire speaker, thereby facilitating miniaturization design.

[0004] The embodiment of the present application is implemented as follows:

[0005] An embodiment of the present application provides a dual-sound speaker, including a first sound unit and a second sound unit; the first sound unit includes a bracket and a speaker diaphragm arranged on the bracket, and the second sound unit includes a piezoelectric sound device; the piezoelectric sound device is attached to the surface of the speaker diaphragm.

[0006] As an optional embodiment, the first sound unit also includes a voice coil and a permanent magnet; the bracket has a single sound chamber, the speaker diaphragm is arranged at the opening of the single sound chamber, and seals the single sound chamber; the voice coil is arranged around the inner wall of the single sound chamber, and the permanent magnet is arranged within the enclosure of the voice coil.

[0007] As an optional implementation, the piezoelectric sound-generating device is located on a surface of the speaker diaphragm that is away from the single sound-generating chamber.

[0008] As an optional implementation, the second sound unit further includes an organic sealing film disposed on the speaker diaphragm for covering the piezoelectric sound device.

[0009] As an optional implementation, there are multiple piezoelectric sound-generating devices, and the multiple piezoelectric sound-generating devices are arranged at intervals on the surface of the speaker diaphragm.

[0010] As an optional embodiment, one of the piezoelectric sound-generating devices is disposed in the middle of the speaker diaphragm, and the remaining piezoelectric sound-generating devices are arranged in a circular array around the center of the speaker diaphragm; or, a plurality of the piezoelectric sound-generating devices are arranged at intervals along a straight line direction on the surface of the speaker diaphragm.

[0011] As an optional implementation, the piezoelectric sound generating device includes a substrate, and a first electrode, a first piezoelectric layer, and a second electrode sequentially stacked on the substrate.

[0012] As an optional implementation, a second piezoelectric layer and a third electrode are sequentially stacked on the second electrode.

[0013] As an optional implementation, the speaker diaphragm includes any one of a PET plastic film, a metal film and a graphene film layer.

[0014] As an optional implementation, a metal coating is provided on the speaker diaphragm to adjust the sound center frequency of the speaker diaphragm.

[0015] The beneficial effects of the embodiments of the present application include:

[0016] The embodiment of the present application provides a dual-sound speaker, including a first sound unit and a second sound unit; the first sound unit includes a bracket and a speaker diaphragm arranged on the bracket, and the second sound unit includes a piezoelectric sound device; the piezoelectric sound device is attached to the surface of the speaker diaphragm. The dual-sound speaker provided in the embodiment of the present application directly attaches the piezoelectric generating device to the speaker diaphragm, which can not only enable the speaker diaphragm to maintain a good sound effect in the medium and low frequency bands, but also ensure a good sound effect in the high frequency band through the piezoelectric sound device. Compared with the prior art, the embodiment of the present application does not need to set up two sound cavities, which can greatly reduce the volume of the entire speaker structure. Therefore, the embodiment of the present application can not only improve the sound quality in the high frequency band, but also effectively reduce the volume of the entire speaker, which is convenient for realizing miniaturization design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is one of the structural schematic diagrams of the dual-sound speaker of the embodiment of the present application;

[0019] Figure 2This is the second structural diagram of the dual-sound speaker according to the embodiment of the present application;

[0020] Figure 3 This is the third structural diagram of the dual-sound speaker of the embodiment of the present application;

[0021] Figure 4 This is the fourth structural diagram of the dual-sound speaker of the embodiment of the present application;

[0022] Figure 5 This is the fifth structural diagram of the dual-sound speaker according to the embodiment of the present application;

[0023] Figure 6 This is the sixth structural diagram of the dual-sound speaker in the embodiment of the present application.

[0024] icon:

[0025] 100-dual sound speaker; 101-bracket; 102-speaker diaphragm; 103-piezoelectric sound device; 104-voice coil; 105-permanent magnet; 106-single sound chamber; 107-organic sealing film; 108-substrate; 109-first electrode; 110-first piezoelectric layer; 111-second electrode; 112-second piezoelectric layer; 113-third electrode. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] Traditional dynamic and balanced iron speakers have good sound effects and outstanding timbre in the mid- and low-frequency bands, but in the high-frequency band greater than 6kHz, the sound quality of traditional speakers is severely attenuated, and cannot bring users a good overtone experience. Speaker devices based on piezoelectric diaphragms have obvious advantages in sound production in high-frequency bands. Therefore, the dual sound units proposed by some manufacturers currently combine the advantages of dynamic, balanced iron speakers and piezoelectric speakers. The dual sound units of the prior art structurally form a first sound cavity and a second sound cavity, wherein the first sound cavity is used to accommodate a traditional speaker, and the second sound cavity is used to accommodate a piezoelectric speaker. This design greatly increases the volume of the sound module as a whole, which is not conducive to achieving a miniaturized design, and will ultimately have an adverse effect on the integration of the speaker into terminal devices such as mobile phones.

[0031] In order to solve the above technical problems, an embodiment of the present application provides a dual-sound speaker 100.

[0032] Reference Figure 1 , Figure 2 As shown, an embodiment of the present application provides a dual-sound speaker 100, including a first sound unit and a second sound unit; the first sound unit includes a bracket 101 and a speaker diaphragm 102 arranged on the bracket 101, and the second sound unit includes a piezoelectric sound device 103; the piezoelectric sound device 103 is attached to the surface of the speaker diaphragm 102.

[0033] It should be noted that in the embodiment of the present application, the piezoelectric generating device is attached to the surface of the speaker diaphragm 102 .

[0034] The piezoelectric sound-generating device 103 is a sound-generating element based on the piezoelectric effect, which can convert an electrical signal into mechanical vibration to generate sound. The piezoelectric sound-generating device 103 is characterized by a small size and a thin thickness.

[0035] Compared with the prior art, the embodiment of the present application directly attaches the piezoelectric sound-generating device 103 to the diaphragm surface of a traditional speaker, and the two sound-generating units share the same speaker diaphragm 102 and sound cavity, eliminating the need for a second sound cavity, thereby significantly reducing the overall volume.

[0036] It should be noted that the bracket 101 is used to support and fix other components. The first sound-emitting unit may be a dynamic speaker. The working principle of the dynamic speaker is as follows: when the audio signal passes through the voice coil 104, the voice coil 104 generates an alternating current in the magnetic field, causing the voice coil 104 and the speaker diaphragm 102 to vibrate. The vibration of the speaker diaphragm 102 pushes the air to produce low-frequency and medium-frequency sounds.

[0037] The piezoelectric sound device 103 generates vibrations through the deformation of the piezoelectric material. When an electrical signal is applied to the piezoelectric material, the material will undergo a slight deformation, thereby driving the speaker diaphragm 102 to vibrate. It should be noted that the piezoelectric sound device 103 can generate high-frequency sounds, which can complement the performance of the dynamic speaker in the high frequency band, thereby improving the overall sound quality of the speaker.

[0038] Since the piezoelectric sound device 103 is directly attached to the diaphragm, the piezoelectric sound device 103 and the diaphragm of the first sound unit vibrate together to form a collaborative system. In this collaborative system, the first sound unit and the second sound unit can achieve frequency complementarity. Specifically, the first sound unit is responsible for low and medium frequencies, while the piezoelectric sound device 103 is responsible for high frequencies. The two complement each other, covering a wider frequency range and improving the overall sound quality. The collaborative work of the two sound units makes the sound richer and more three-dimensional, improving the user's auditory experience.

[0039] In addition, since the embodiment of the present application no longer requires an additional sound cavity and a complex connection structure, the overall design is more concise, reducing the manufacturing cost and assembly difficulty. Compared with the prior art, the dual-sound speaker 100 provided in the embodiment of the present application can reduce the number and complexity of components, which helps to improve the reliability and durability of the product.

[0040] It should be noted that the first sound-emitting unit of the embodiment of the present application may also be configured as a moving iron speaker, and the piezoelectric sound-emitting device 103 is attached to the diaphragm surface of the moving iron speaker.

[0041] The dual-sound speaker 100 structure provided in the embodiment of the present application realizes the coordinated operation of the dynamic speaker and the piezoelectric sound device 103 by directly attaching the piezoelectric sound device 103 to the diaphragm surface of the traditional speaker. The embodiment of the present application not only reduces the overall volume of the dual-sound speaker 100, solves the problem of the traditional dual-sound unit occupying too much space, but also improves the sound quality performance, and is particularly suitable for terminal devices with strict space requirements. By sharing the diaphragm and the sound cavity, the embodiment of the present application simplifies the structure and reduces the manufacturing cost while maintaining high performance, and has a wide range of application prospects.

[0042] It should be noted that the dual-sound speaker 100 provided in the embodiment of the present application can be installed in a smart phone, which can achieve higher sound quality performance in a limited body space and improve the user's music, video and call experience. In addition, the dual-sound speaker 100 provided in the embodiment of the present application can also be set in smart watches, TWS (true wireless stereo) headphones, smart speakers, smart doorbells and other home appliances. The dual-sound speaker 100 provided in the embodiment of the present application can provide clearer and richer sound in a compact device.

[0043] Reference Figure 1 As shown, as an optional embodiment, the first sound unit also includes a voice coil 104 and a permanent magnet 105; a single sound chamber 106 is provided on the bracket 101, and the speaker diaphragm 102 is arranged at the opening of the single sound chamber 106 and seals the single sound chamber 106; the voice coil 104 is arranged around the inner wall of the single sound chamber 106, and the permanent magnet 105 is arranged within the enclosure of the voice coil 104.

[0044] It should be noted that the first sound unit includes a voice coil 104 and a permanent magnet 105, and the voice coil 104 and the permanent magnet 105 are arranged inside a single sound chamber 106. The permanent magnet 105 of the embodiment of the present application can generate a magnetic field, and usually uses neodymium iron boron or other high-performance permanent magnet materials. The voice coil 104 is located in the magnetic field generated by the permanent magnet 105. When the audio signal passes through the voice coil 104, an alternating current is generated in the voice coil 104, and a force is applied in the magnetic field, causing the speaker and the voice coil 104 to vibrate.

[0045] It should be noted that the speaker diaphragm 102 of the embodiment of the present application includes any one of a PET plastic film, a metal film and a graphene film layer. The shape of the speaker of the embodiment of the present application can be a cone, a flat plate or a dome. The speaker diaphragm 102 is connected to the voice coil 104 and is responsible for transmitting the vibration of the voice coil 104 to the air to generate sound waves.

[0046] Reference Figure 1 , Figure 2 As shown, as an optional implementation, the piezoelectric sound-generating device 103 is located on the surface of the speaker diaphragm 102 that is away from the single sound-generating chamber 106 .

[0047] In the embodiment of the present application, the piezoelectric sound device 103 is disposed on the surface of the speaker diaphragm 102 away from the single generating chamber. It should be noted that, according to the needs, those skilled in the art can also dispose the piezoelectric sound device 103 on the surface of the speaker diaphragm 102 close to the single generating chamber.

[0048] Reference Figure 1As shown, as an optional implementation, the second sound unit further includes an organic sealing film 107 disposed on the speaker diaphragm 102 for covering the piezoelectric sound device 103 .

[0049] The embodiment of the present application uses an organic sealing film 107 to cover the piezoelectric sound device 103. The thickness of the organic sealing film 107 is slightly greater than the thickness of the piezoelectric sound device 103, and the volume of the dual sound speaker 100 will not be significantly increased.

[0050] It should be noted that the organic film layer can be made of any one of epoxy resin, polyethylene, polyvinyl chloride and polyurethane, and those skilled in the art can configure it according to the needs.

[0051] Exemplarily, the organic film layer can be made of a polyurethane material with good flexibility. The polyurethane film layer has excellent wear resistance and impact resistance, can withstand large mechanical stress, and provide long-term protection. The polyurethane film layer has good elasticity and flexibility, and is suitable for occasions requiring frequent vibration. In addition, the organic film layer also has excellent adhesion, can be well combined with a variety of materials, and provide a reliable packaging effect.

[0052] It should be noted that polyurethane has a lower density, which helps to reduce the overall weight.

[0053] Reference Figure 3 , Figure 4 As shown, as an optional implementation, there are multiple piezoelectric sound-generating devices 103 , and the multiple piezoelectric sound-generating devices 103 are arranged at intervals on the surface of the speaker diaphragm 102 .

[0054] Furthermore, the piezoelectric sound generating devices 103 of the embodiment of the present application are multiple and arranged at intervals on the surface of the speaker diaphragm 102. The embodiment of the present application can effectively enhance the sound quality of high-frequency sound through the arrangement of multiple piezoelectric sound generating devices 103, which is conducive to covering a wider frequency range and improving the overall sound quality. The sound is richer and more three-dimensional, which improves the user's auditory experience.

[0055] For example, refer to Figure 3 As shown, there are seven piezoelectric sound generating devices 103 , one piezoelectric sound generating device 103 is disposed in the middle of the speaker diaphragm 102 , and the remaining six piezoelectric sound generating devices 103 are arranged in a circular array around the center of the speaker diaphragm 102 .

[0056] For example, refer to Figure 4 As shown, five piezoelectric sound generating devices 103 are arranged at intervals along a straight line on the surface of the speaker diaphragm 102 .

[0057] It should be noted that those skilled in the art can adjust the shape and arrangement of the piezoelectric sound generating device 103 according to the shape of the speaker diaphragm 102 .

[0058] It should be noted that the speaker diaphragm 102 of the present embodiment is provided with a plurality of piezoelectric sound generating devices 103, wherein the size of each sound generating device is different. The present embodiment can adjust the area and thickness of the piezoelectric sound generating unit according to different high frequency sound generating requirements to adjust the high frequency sound generating center frequency.

[0059] Exemplarily, three piezoelectric sound generating devices 103 are arranged on the speaker diaphragm 102, the thickness of the first speaker diaphragm 102 is greater than the thickness of the second speaker diaphragm 102, the thickness of the second speaker diaphragm 102 is greater than the thickness of the third speaker diaphragm 102. The area of ​​the first speaker diaphragm 102 is greater than the area of ​​the second speaker diaphragm 102, and the area of ​​the second speaker diaphragm 102 is greater than the area of ​​the third speaker diaphragm 102.

[0060] Reference Figure 5 As shown, as an optional implementation, the piezoelectric sound generating device 103 includes a substrate 108 and a first electrode 109 , a first piezoelectric layer 110 , and a second electrode 111 sequentially stacked on the substrate 108 .

[0061] It should be noted that the substrate 108 of the embodiment of the present application can be made of any material such as lead zirconate titanate, scandium-doped aluminum nitride, zinc oxide, and polyvinylidene fluoride. The embodiment of the present application is not particularly limited to this, and those skilled in the art can make the selection according to their needs.

[0062] Further, see Figure 6 As shown, a second piezoelectric layer 112 and a third electrode 113 are sequentially stacked on the second electrode 111. The superposition of multiple piezoelectric layers can effectively enhance the driving force of the piezoelectric generating device 103, which is beneficial to improving the high-frequency sound quality performance.

[0063] As an optional implementation, a metal coating is provided on the speaker diaphragm 102 to adjust the sound center frequency of the speaker diaphragm 102 .

[0064] It should be noted that the embodiment of the present application can adjust the sound center frequency of the speaker diaphragm 102 through metal plating, and can adjust the stiffness of the speaker diaphragm 102 through chrome plating, titanium plating, and beryllium plating.

[0065] Exemplarily, a chrome-plated metal layer is disposed on the speaker diaphragm 102. Exemplarily, a titanium-plated metal layer is disposed on the speaker diaphragm 102.

[0066] The dual-sound speaker 100 provided in the embodiment of the present application combines the advantages of two types of speakers. The traditional dynamic unit is responsible for low-frequency sound, and the piezoelectric sound unit is responsible for high-frequency sound, so it can achieve high sound pressure level sound in the full frequency band. In addition, the structural setting of the single sound cavity in the embodiment of the present application will not increase the volume of the original speaker acoustic module.

[0067] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dual-sound speaker, characterized in that: It comprises a first sound-emitting unit and a second sound-emitting unit; the first sound-emitting unit comprises a bracket (101) and a loudspeaker diaphragm (102) arranged on the bracket (101); the second sound-emitting unit comprises a piezoelectric sound-emitting device (103); the piezoelectric sound-emitting device (103) is attached to the surface of the loudspeaker diaphragm (102).

2. The dual-sound speaker according to claim 1, characterized in that: The first sound-emitting unit further comprises a voice coil (104) and a permanent magnet (105); the bracket (101) is provided with a single sound-emitting chamber (106); the speaker diaphragm (102) is arranged at the opening of the single sound-emitting chamber (106) and seals the single sound-emitting chamber (106); the voice coil (104) is arranged around the inner wall of the single sound-emitting chamber (106), and the permanent magnet (105) is arranged within the enclosure of the voice coil (104).

3. The dual-sound speaker according to claim 2, characterized in that: The piezoelectric sound-generating device (103) is located on a surface of the loudspeaker diaphragm (102) that is away from the single sound-generating chamber (106).

4. The dual-sound speaker according to any one of claims 1 to 3, characterized in that: The second sound-generating unit further comprises an organic sealing film (107) arranged on the loudspeaker diaphragm (102) and used for covering the piezoelectric sound-generating device (103).

5. The dual-sound speaker according to any one of claims 1 to 3, characterized in that: There are a plurality of piezoelectric sound generating devices (103), and the plurality of piezoelectric sound generating devices (103) are arranged at intervals on the surface of the loudspeaker diaphragm (102).

6. The dual-sound speaker according to claim 5, characterized in that: One of the piezoelectric sound generating devices (103) is arranged in the middle of the speaker diaphragm (102), and the remaining piezoelectric sound generating devices (103) are arranged in a circular array around the center of the speaker diaphragm (102); or, a plurality of the piezoelectric sound generating devices (103) are arranged at intervals along a straight line on the surface of the speaker diaphragm (102).

7. The dual-sound speaker according to any one of claims 1 to 3, characterized in that: The piezoelectric sound generating device (103) comprises a substrate (108), and a first electrode (109), a first piezoelectric layer (110), and a second electrode (111) which are sequentially stacked on the substrate (108).

8. The dual-sound speaker according to claim 7, characterized in that: A second piezoelectric layer (112) and a third electrode (113) are sequentially stacked on the second electrode (111).

9. The dual-sound speaker according to any one of claims 1 to 3, characterized in that: The loudspeaker diaphragm (102) comprises any one of a PET plastic film, a metal film and a graphene film layer.

10. The dual-sound speaker according to any one of claims 1 to 3, characterized in that: The loudspeaker diaphragm (102) is provided with a metal coating for adjusting the sound center frequency of the loudspeaker diaphragm (102).

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