Vibrating diaphragm and piezoelectric buzzer

Abstract

The utility model discloses a sound production component, and particularly relates to a vibrating diaphragm, which comprises a cylinder body part with two different diameters at two ends, a wide edge part I positioned at the large-diameter end of the cylinder body part, a wide edge part II positioned at the small-diameter end of the cylinder body part, a wide edge part III positioned at the outer edge of the large-diameter end and extending along the periphery of the large-diameter end, and a wide edge part III positioned at the small-diameter end of the cylinder body part and extending along the periphery of the large-diameter end. The wide edge part II is positioned on the inner edge of the small-diameter end and extends along the periphery of the small-diameter end; the folding ring part is located on the wide edge part I and extends along the periphery of the wide edge part I. Meanwhile, the utility model also provides a piezoelectric buzzer. The technical problem that the sounding tone of the piezoelectric buzzer is reduced is solved. The vibrating diaphragm provided by the utility model is applied to the piezoelectric buzzer, so that the sounding tone of the piezoelectric buzzer can be reduced, and the sounding loudness and tone quality can be improved at the same time. In addition, the piezoelectric buzzer also has the advantages of low power consumption, high conversion efficiency, simple structure, no magnetism and the like.

Description

Technical Field

[0001] The utility model relates to a sound-generating component, in particular to a diaphragm, and also provides a piezoelectric buzzer. Background Art

[0002] A piezoelectric buzzer is a sound-generating body that uses piezoelectric material (piezoelectric ceramic thin sheets) as an electroacoustic transducer. It has the advantages of no radio frequency noise, low power consumption, simpler structure, and greater economy.

[0003] However, when piezoelectric buzzers meet strict size requirements, their poor sound quality is a fatal flaw. While they have ample treble (above 2500Hz), they lack midrange (1500Hz-700Hz) and bass (below 500Hz). The peak sound of a piezoelectric buzzer is concentrated within a very narrow bandwidth of 2.7kHz-4kHz, resulting in a high-pitched sound. This bandwidth precludes their application in voice-related products such as sounders and receivers. They can only be used in high-frequency sound-generating devices such as alarms and warning devices, severely limiting their application range.

[0004] Therefore, the present utility model is proposed. Summary of the Invention

[0005] An object of the present invention is to provide a diaphragm capable of reducing the tone of a piezoelectric buzzer.

[0006] Another object of the present invention is to provide a piezoelectric buzzer with a relatively lower sound tone.

[0007] In order to achieve the above-mentioned purpose, the utility model designs a diaphragm, in which a folding ring portion is provided on the diaphragm and extends and distributes along the periphery thereof.

[0008] The diaphragm mentioned above is designed with a folding ring to expand the surface area and effective vibration area of ​​the diaphragm while maintaining the same size. This allows the vibration of the diaphragm to push more surrounding air (medium), thereby reducing the vibration frequency of the diaphragm. Applying the diaphragm with the above structure to a piezoelectric buzzer can reduce the tone of the piezoelectric buzzer.

[0009] Preferably, the structure of the diaphragm comprises: a cylindrical portion with different diameters at both ends, a wide side portion I located on the large diameter end of the cylindrical portion, the wide side portion I being located at the outer edge of the large diameter end and extending along the periphery of the large diameter end, and a wide side portion II located on the small diameter end of the cylindrical portion, the wide side portion II being located at the inner edge of the small diameter end and extending along the periphery of the small diameter end;

[0010] The folding ring portion is located on the wide side portion I and extends along the periphery of the wide side portion I.

[0011] More preferably, the cross-section of the fold portion is an arc. Of course, in actual situations, the cross-section of the fold portion can also be other shapes, such as square, cone, etc.

[0012] The shape of the diaphragm in the above preferred embodiment is closer to the shape of a horn, and the principles of sound wave propagation and acoustic resonance can be used to enhance the sound propagation effect, thereby improving the loudness and timbre of the sound.

[0013] The utility model is a piezoelectric buzzer, the structure of which comprises: a diaphragm with the structure as described above.

[0014] Preferably, a piezoelectric buzzer comprises: a front cover, a rear cover, a piezoelectric buzzer piece and a diaphragm;

[0015] Wherein, the front cover is provided with a sound outlet;

[0016] Among them, the front cover and the rear cover are installed together to form a cavity, and the cavity and the sound outlet are connected to each other; the piezoelectric buzzer and the diaphragm are both located in the cavity, one side of the diaphragm is bonded to the piezoelectric buzzer, and the other side is bonded to the inner wall of the front cover.

[0017] The buzzer in the above preferred technical solution has a simple structure and is easy to assemble and disassemble.

[0018] The piezoelectric buzzer has a preferred layered structure, comprising: a metal plating layer, a piezoelectric material layer, a metal plating layer, a glue layer and a conductive base layer, which are compounded in sequence;

[0019] A first soldering point is provided on the metal plating layer on the single-side surface, and a second soldering point is provided on the conductive base layer. The first soldering point and the second soldering point are connected to the positive electrode and the negative electrode of the audio signal respectively.

[0020] In the above-mentioned piezoelectric buzzer, another preferred layered structure of the piezoelectric buzzer sheet includes: a metal plating layer, a piezoelectric material layer, a metal plating layer, a glue layer, a conductive base layer, a glue layer, a metal plating layer, a piezoelectric material layer, and a metal plating layer, which are composited in sequence;

[0021] Among them, first welding points are provided on the metal plating layers on both sides and are connected to each other, and second welding points are provided on the conductive base layer. The first welding point and the second welding point are respectively connected to the positive and negative electrodes of the audio signal.

[0022] The above-mentioned conductive base layer is further preferably selected to be a metal sheet or a graphene film; further, it is preferably selected to be an aluminum sheet or an aluminum-magnesium alloy sheet or a graphene film.

[0023] Of course, in actual situations, the conductive base layer may also be other conductive film materials, such as a conductive polymer film.

[0024] The metal plating layer is preferably a silver plating layer.

[0025] Compared with the prior art, the diaphragm obtained by the present invention can be used in a piezoelectric buzzer to reduce the tone of the sound of the piezoelectric buzzer while improving the loudness and timbre of the sound.

[0026] The piezoelectric buzzer obtained by the utility model has the following technical advantages and characteristics:

[0027] This piezoelectric buzzer solves the problem of poor mid-range and bass in traditional piezoelectric sound-generating devices, enabling them to produce sound quality comparable to dynamic coil sound-generating devices (headphones and speakers). This device can be applied to common audio devices such as speakers and receivers, replacing inefficient, costly, and environmentally unfriendly dynamic coil sound-generating devices. Furthermore, this device offers the advantages of low power consumption, high conversion efficiency, simple structure, and non-magnetic properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the axial structure of a diaphragm;

[0029] Figure 2 It is a schematic diagram of the top structure of a diaphragm;

[0030] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0031] Figure 4 It is a schematic diagram of the axial structure of a buzzer;

[0032] Figure 5 This is a schematic diagram of the top structure of a buzzer;

[0033] Figure 6 yes Figure 5 Schematic diagram of the cross-sectional structure at the middle BB;

[0034] Figure 7 It is a schematic diagram of the assembly structure of a piezoelectric buzzer and a diaphragm;

[0035] Figure 8 It is a schematic diagram of the layered structure of a piezoelectric buzzer;

[0036] Figure 9 This is another schematic diagram of the assembly structure of a piezoelectric buzzer and a diaphragm;

[0037] Figure 10 This is a schematic diagram of the layered structure of another piezoelectric buzzer.

[0038] In the picture:

[0039] Diaphragm 1, barrel 1-1, wide side I 1-2, wide side II 1-3, rim 1-4;

[0040] Front cover 2, sound outlet 2-1;

[0041] Back cover 3;

[0042] Piezoelectric buzzer 4, metal plating 4-1, piezoelectric material layer 4-2, glue layer 4-3, conductive base layer 4-4, first solder joint 4-5, second solder joint 4-6. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0044] like Figure 1-3 As shown, as an embodiment of the present invention, a diaphragm 1 is provided in this embodiment, which is an integrated structure, including: a cylindrical portion 1-1 with different diameters at both ends, a wide side portion I1-2 located on the large diameter end of the cylindrical portion 1-1, the wide side portion I1-2 is located at the outer edge of the large diameter end and extends along the periphery of the large diameter end, and a wide side portion II1-3 located on the small diameter end of the cylindrical portion 1-1, the wide side portion II1-3 is located at the inner edge of the small diameter end and extends along the periphery of the small diameter end; a folding ring portion 1-4 is provided on the wide side portion I1-2 of the diaphragm 1, and is extended and distributed along its periphery.

[0045] In this embodiment, the cross-sectional shape of the folding ring portion 1-4 is arc-shaped.

[0046] In this embodiment, the diaphragm 1 is made of a polymer film.

[0047] The diaphragm 1 mentioned above is designed with the folding ring portion 1-4, which expands the surface area and effective vibration area of ​​the diaphragm 1 while maintaining the same size. This allows the vibration of the diaphragm 1 to push more surrounding air (medium), thereby reducing the vibration frequency of the diaphragm 1. Applying the diaphragm 1 with the above structure to a piezoelectric buzzer can reduce the tone of the piezoelectric buzzer.

[0048] At the same time, the shape of the diaphragm 1 is closer to that of a horn, and the principles of sound wave propagation and acoustic resonance can be used to enhance the sound propagation effect, thereby improving the loudness and timbre of the sound.

[0049] In addition, if Figure 4-7As shown, this embodiment also provides a piezoelectric buzzer, the structure of which includes: a front cover 2, a rear cover 3, a piezoelectric buzzer piece 4 and the diaphragm 1 as described above;

[0050] Wherein, the front cover 2 is provided with a sound outlet 2-1;

[0051] Among them, the front cover 2 and the rear cover 3 are installed together to form a cavity, and the cavity and the sound hole 2-1 are connected to each other; the piezoelectric buzzer 4 and the diaphragm 1 are both located in the cavity, and the wide side portion Ⅱ1-3 of the diaphragm 1 and the piezoelectric buzzer 4 are tightly attached to each other and bonded to the piezoelectric buzzer 4 by glue, and the periphery of its wide side portion Ⅰ1-2 is bonded to the inner wall of the front cover 2 by glue.

[0052] like Figure 8 As shown, the layered structure of the piezoelectric buzzer 4 in this embodiment includes: a metal plating layer 4-1, a piezoelectric material layer 4-2, a metal plating layer 4-1, a glue layer 4-3 and a conductive base layer 4-4 that are composited in sequence;

[0053] A first solder joint 4-5 is provided on the metal plating layer 4-1 on the single-side surface, and a second solder joint 4-6 is provided on the conductive base layer 4-4. The first solder joint 4-5 and the second solder joint 4-6 are connected to the positive and negative electrodes of the audio signal respectively.

[0054] The buzzer in this embodiment has a simple structure and is easy to assemble and disassemble.

[0055] In this embodiment, the metal plating layer 4 - 1 is a silver plating layer with excellent electrical conductivity.

[0056] In this embodiment, the piezoelectric material layer 4 - 2 is a ceramic layer.

[0057] In this embodiment, the conductive substrate corresponding to the conductive base layer 4-4 is an aluminum-magnesium alloy sheet or an aluminum sheet. The density of magnesium is approximately 1.74 g / cm³, and the density of aluminum is approximately 2.7 g / cm³. If the conductive substrate is made of an aluminum-magnesium alloy sheet, the density of the conductive substrate can reach 2.0 g / cm³. Compared to iron and copper sheets, the aluminum-magnesium alloy sheet or the aluminum sheet can achieve a greater vibration amplitude (amplitude), thereby effectively improving the mid- and low-pitched sound quality of the sound-generating device. If the conductive substrate is made of an aluminum sheet, the density of the conductive substrate can reach 2.7 g / cm³. Compared to iron and copper sheets, the conductive substrate can also achieve a greater vibration amplitude, thereby effectively improving the mid- and low-pitched sound quality of the sound-generating device.

[0058] In another embodiment, the conductive substrate corresponding to the conductive base layer 4-4 is graphene. Graphene is very light, with a density of approximately 0.77 grams per cubic centimeter (g / cm³), making it an ideal choice for lightweight applications. Graphene also has extremely high electrical conductivity and is one of the best known electrical conductors. Graphene can be made very thin. Graphene is composed of a single layer of planar carbon atoms, forming a hexagonal lattice structure. This property allows graphene to be made very thin, theoretically only one atomic layer thick. Graphene also has excellent mechanical strength, making it particularly suitable for making thin and lightweight diaphragms. If the conductive substrate is made of graphene, the density of the conductive substrate can reach 0.77 grams per cubic centimeter (g / cm³). Compared to the aluminum-magnesium alloy sheet or aluminum sheet in the first embodiment described above, the conductive substrate can further achieve a larger vibration amplitude, thereby further improving the mid- and low-pitched sound quality of the sound-generating device.

[0059] As the third embodiment of the present invention, Figure 9 and Figure 10 As shown, a piezoelectric buzzer is provided in this embodiment, and the layered structure of the piezoelectric buzzer piece 4 includes: a metal plating layer 4-1, a piezoelectric material layer 4-2, a metal plating layer 4-1, a glue layer 4-3, a conductive base layer 4-4, a glue layer 4-3, a metal plating layer 4-1, a piezoelectric material layer 4-2 and a metal plating layer 4-1 which are compounded in sequence;

[0060] Among them, first welding points 4-5 are provided on the metal plating 4-1 on both sides and are connected to each other, and second welding points 4-6 are provided on the conductive base layer 4-4. The first welding point 4-5 and the second welding point 4-6 are respectively connected to the positive and negative poles of the audio signal.

[0061] The materials of each layer of a piezoelectric buzzer 4 in this embodiment are consistent with those of the first embodiment described above. However, the piezoelectric buzzer 4 provided in this embodiment is designed to further reduce the impedance while improving the conversion energy efficiency when the audio signal voltage remains unchanged by designing a double-layer piezoelectric material layer 4-2 in parallel, thereby further improving the performance of the piezoelectric buzzer 4.

[0062] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. A diaphragm, characterized in that: The diaphragm is provided with a folding ring portion, which is extended and distributed along the periphery thereof; The structure of the diaphragm includes: a cylindrical portion with different diameters at both ends, a wide side portion I located on the large diameter end of the cylindrical portion, the wide side portion I located at the outer edge of the large diameter end and extending along the periphery of the large diameter end, and a wide side portion II located on the small diameter end of the cylindrical portion, the wide side portion II located at the inner edge of the small diameter end and extending along the periphery of the small diameter end; the folding ring portion is located on the wide side portion I and extends along the periphery of the wide side portion I.

2. The diaphragm according to claim 1, characterized in that: The cross-section of the folding ring portion is arc-shaped.

3. A piezoelectric buzzer, characterized in that include: A diaphragm as claimed in any one of claims 1 or 2 above.

4. A piezoelectric buzzer according to claim 3, characterized in that: include: Front cover, back cover, piezoelectric buzzer and diaphragm; Wherein, the front cover is provided with a sound outlet; Among them, the front cover and the rear cover are installed together to form a cavity, and the cavity and the sound outlet are connected to each other; the piezoelectric buzzer and the diaphragm are both located in the cavity, one side of the diaphragm is bonded to the piezoelectric buzzer, and the other side is bonded to the inner wall of the front cover.

5. A piezoelectric buzzer according to claim 4, characterized in that The layered structure of the piezoelectric buzzer comprises: a metal plating layer, a piezoelectric material layer, a metal plating layer, a glue layer and a conductive base layer which are compounded in sequence; A first soldering point is provided on the metal plating layer on the single-side surface, and a second soldering point is provided on the conductive base layer. The first soldering point and the second soldering point are connected to the positive electrode and the negative electrode of the audio signal respectively.

6. A piezoelectric buzzer according to claim 4, characterized in that The layered structure of the piezoelectric buzzer comprises: a metal plating layer, a piezoelectric material layer, a metal plating layer, a glue layer, a conductive base layer, a glue layer, a metal plating layer, a piezoelectric material layer and a metal plating layer which are compounded in sequence; Among them, first welding points are provided on the metal plating layers on both sides and are connected to each other, and second welding points are provided on the conductive base layer. The first welding point and the second welding point are respectively connected to the positive and negative electrodes of the audio signal.

7. A piezoelectric buzzer according to claim 5 or 6, characterized in that: The conductive base layer is a metal sheet or a graphene film.

8. A piezoelectric buzzer according to claim 5 or 6, characterized in that: The metal plating layer is a silver plating layer.

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