A receiver having a center piezoelectric body supported diaphragm

Abstract

The application discloses a receiver with a center piezoelectric body supporting a diaphragm, which comprises a shell, a metal washer, a diaphragm assembly, an insulating washer and a pad ring are sequentially encapsulated in the shell, the diaphragm assembly comprises a metal film ring and a diaphragm; the shell is further provided with a piezoelectric body; the first end of the piezoelectric body is fixed to the inner side surface of the pad ring and is electrically connected with a terminal provided on the outer side surface of the pad ring; the second end of the piezoelectric body is supported and connected to the center of the diaphragm and is electrically connected with the shell through the diaphragm assembly; when the terminal and the shell are applied with an audio alternating voltage, the piezoelectric body vibrates to generate sound, and the diaphragm vibrates to generate sound under the driving of the piezoelectric body. The receiver of the application realizes sound generation by piezoelectric body vibration and diaphragm vibration, is complementary in frequency response and has a good sound generation effect in the low, medium and high frequency bands. The receiver of the application has the advantages of small power consumption, high efficiency, simple structure, simple manufacturing process and easy miniaturization.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic devices, and in particular to a receiver with a central piezoelectric body supporting a diaphragm. Background Art

[0002] A receiver is an electroacoustic device that uses the ear cavity as a coupling cavity to convert electrical audio signals into acoustic signals without sound leakage. Receivers convert electrical energy into acoustic energy through physical effects. Receivers are categorized into various types, such as electromagnetic, piezoelectric, capacitive, and electrodynamic, depending on the physical effect of the electroacoustic conversion. Different receiver types often perform differently in different frequency bands, making it difficult to achieve optimal performance across low, mid, and high frequencies. Summary of the Invention

[0003] The object of the present invention is to provide a receiver with a central piezoelectric body supporting a diaphragm, so as to improve the sound effect of the receiver and simplify the structure and process of the receiver.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a receiver with a central piezoelectric body supporting a diaphragm, comprising a shell, in which a metal gasket, a diaphragm assembly, an insulating gasket ring and a pad are encapsulated in sequence, and the diaphragm assembly includes a metal diaphragm ring and a diaphragm pasted on the metal diaphragm ring; the shell is also provided with a piezoelectric body located between the pad and the diaphragm; the first end of the piezoelectric body is fixed to the inner surface of the pad and is electrically connected to the wiring terminal provided on the outer surface of the pad; the second end of the piezoelectric body supports and is connected to the center of the diaphragm, and is electrically connected to the shell through the diaphragm assembly; when an audio AC voltage is applied to the wiring terminal and the shell, the piezoelectric body vibrates and makes sound, and the diaphragm vibrates and makes sound under the drive of the piezoelectric body.

[0005] In one possible implementation, the inner surface of the pad has a first metal layer that is electrically connected to the piezoelectric body and insulated from the shell, and the outer surface has a second metal layer that is electrically connected to the terminal and insulated from the shell, and the first metal layer and the second metal layer are electrically connected through metallized through holes.

[0006] In a possible implementation, the backing plate is a double-sided copper-clad plate having metal layers on both surfaces, and the metal layers on the double-sided copper-clad plate near the edge area of ​​the shell are etched away.

[0007] In a possible implementation, a surface of the diaphragm connected to the piezoelectric body has a metallized coating, and end surfaces at both ends of the piezoelectric body both have metallized coatings.

[0008] In a possible implementation manner, the center of the diaphragm is provided with a needle-shaped contact point, which is connected to the piezoelectric body through conductive glue.

[0009] In a possible implementation manner, the piezoelectric body is a columnar piezoelectric body.

[0010] From the above technical solutions, the embodiments of the present application have the following advantages:

[0011] 1. The receiver of the present application is driven by the piezoelectric body to vibrate and drive the diaphragm to vibrate and sound, which has the advantages of low power consumption, high efficiency, simple structure, simple and easy manufacturing process, and further miniaturization.

[0012] 2. When the receiver of the present application is used with audio alternating voltage, the piezoelectric body will vibrate and sound, and the piezoelectric body will also act on the diaphragm, which will drive the diaphragm to vibrate and sound. The frequency response range of the piezoelectric body is better in medium and high frequencies, but the low frequency characteristics are poor; the frequency response characteristics of the driven diaphragm are better in low frequencies; the combination of the two has complementary effects on the frequency response, and good sound effects are achieved in the low, medium and high frequency bands. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments and the prior art description will be briefly introduced.

[0014] Figure 1 is a structural schematic diagram of a receiver with a center piezoelectric body supporting a diaphragm provided by the embodiment 1 of the present application;

[0015] Figure 2 is a structural schematic diagram of a diaphragm assembly of a receiver with a center piezoelectric body supporting a diaphragm provided by the embodiment of the present application. DETAILED DESCRIPTION

[0016] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0017] The specific embodiments will be described in detail below.

[0018] The embodiment of the present application provides a receiver (micro speaker) with a center piezoelectric body supporting a diaphragm.

[0019] The diaphragms of common receivers are mostly circular, oval, square, rectangular, or racetrack oval-square shapes. Moreover, the diaphragms are all fixed on all sides. This patent proposes a structure in which the diaphragm is fixed on all sides and has a central piezoelectric body supporting the diaphragm.

[0020] The technical principle of the receiver according to the embodiment of the present invention is as follows.

[0021] A receiver with a central piezoelectric body supporting a diaphragm can be simplified into two parts in principle: one is the diaphragm assembly system with a central rigid support. Analysis of this is equivalent to analyzing a diaphragm assembly system with a central rigid support. The other is the piezoelectric body at the center of the diaphragm, a cylindrical piezoelectric body with one end fixed and the other free. When a voltage is applied in the axial direction (i.e., perpendicular to the plane of the diaphragm), it deforms in the axial direction. The magnitude of this deformation is determined by the piezoelectric coefficient d33 of the piezoelectric body. If the applied voltage is an alternating signal voltage, the deformation changes accordingly. Therefore, when an audio AC voltage is applied, the piezoelectric body vibrates and produces sound. At the same time, the piezoelectric body acts on the diaphragm, driving the diaphragm to vibrate and produce sound.

[0022] The receiver of the present invention is a receiver (micro speaker) in which a central piezoelectric body vibrates and drives the diaphragm supported by it to vibrate and produce sound. It is different from a general dynamic coil receiver and has the advantages of low power consumption, low heat generation, and high efficiency. It also has the advantages of a simple structure, a convenient manufacturing process, and easy operation. It can be further miniaturized and promoted to the field of microelectronic devices.

[0023] When an audio AC voltage is applied to the receiver of the present invention, the piezoelectric element vibrates and produces sound. Simultaneously, the piezoelectric element acts on the diaphragm, driving the diaphragm to vibrate and produce sound. The piezoelectric element's vibration produces sound with good mid- and high-frequency response, but poor low-frequency characteristics. Meanwhile, the frequency response of the diaphragm driven by the piezoelectric element has a better low-frequency response. The combination of the two creates a complementary effect, achieving excellent sound across the entire low, mid, and high frequency ranges.

[0024] Please refer to Figure 1 , is a structural schematic diagram of a receiver with a central piezoelectric body supporting a diaphragm provided in Example 1 of the present invention.

[0025] like Figure 1 As shown, the receiver includes a housing 7, which houses a metal washer 1, a diaphragm assembly 2, an insulating ring 4, and a backing plate 5, sequentially encapsulated from one end to the other. The diaphragm assembly 2 includes a metal diaphragm ring 21 and a diaphragm 22 attached to the metal diaphragm ring. The side of the diaphragm 22 facing the backing plate 5 has a metallized coating.

[0026] The housing 7 also includes a piezoelectric element 3 positioned between the backing plate 5 and the diaphragm 22. The piezoelectric element 3 can be a cylindrical piezoelectric element (or a piezoelectric cylinder). The first end of the piezoelectric element 3 is fixed to the inner surface of the backing plate 5 and electrically connected to the terminal 9 provided on the outer surface of the backing plate 5. The second end of the piezoelectric element 3 supports and connects to the center of the diaphragm 22 and is electrically connected to the housing 7 via the diaphragm assembly 2. The end surfaces of both ends of the piezoelectric element 3 have a metallized layer to facilitate electrical connection with the diaphragm 22 and backing plate 5.

[0027] The pad 5 can be a double-sided copper-clad plate with a metal layer 8 on both sides, and the metal layer 8 in the edge area (outer ring part) close to the shell 7 on the double-sided copper-clad plate is etched away to ensure mutual insulation with the shell 7.

[0028] The metal layers 8 on both sides of the pad 5 include a first metal layer on the inner side electrically connected to the piezoelectric element 3 and insulated from the housing 7, and a second metal layer on the outer side electrically connected to the terminal block 9 and insulated from the housing 7. The first and second metal layers on both sides of the pad 5 can be electrically connected via metallized through-holes 6 extending through the pad 5.

[0029] The audio signal is an AC voltage, which can be input through the housing 7 and the terminal 9. This voltage is applied to the upper and lower end surfaces of the centrally supported piezoelectric element 3. The piezoelectric element 3 has a large piezoelectric coefficient d33. When a voltage is applied in the axial direction (i.e., perpendicular to the plane of the diaphragm), it produces an axial deformation, the magnitude of which is determined by the piezoelectric coefficient d33. If the applied voltage is an alternating signal voltage, the deformation produced varies accordingly with the alternating signal voltage. Therefore, when an audio AC voltage is applied, the piezoelectric element vibrates and produces sound, while simultaneously acting on the diaphragm 2, driving the diaphragm to vibrate and produce sound.

[0030] Please refer to Figure 2 , a schematic structural diagram of a diaphragm assembly of a receiver with a central piezoelectric body supporting the diaphragm provided by Example 2 of the present invention.

[0031] In this embodiment, a needle-shaped contact 10 is provided at the center of the diaphragm and is connected to the piezoelectric element via conductive adhesive. This needle-shaped contact ensures good contact with the piezoelectric element 3. Conductive adhesive is applied to the contact point to ensure secure contact and good electrical conductivity. The needle-shaped contact is also connected to the metallized coating and metal film ring of the diaphragm, ensuring that the second end face of the piezoelectric element can be electrically connected to the housing 7.

[0032] Optionally, the needle-shaped contact can be a metal member with a rivet or rivet-button structure, which is nailed or buckled onto the diaphragm and then connected to the end face of the piezoelectric element. When the diaphragm is thin, it is difficult to achieve a good direct connection and fixation between the diaphragm and the piezoelectric element. By using a needle-shaped contact with a rivet or rivet-button structure, the diaphragm and the piezoelectric element can be better fixed and connected, and the diaphragm and the piezoelectric element can be better electrically connected, ensuring conductive performance.

[0033] Similarly, when an audio signal is input through housing 7 and terminals 9, a voltage is applied to the upper and lower surfaces of the centrally supported piezoelectric cylinder 3. Piezoelectric element 3 has a large piezoelectric coefficient d33. When a voltage is applied in the axial direction (i.e., perpendicular to the plane of the diaphragm), it deforms in that direction, the magnitude of which is determined by the piezoelectric coefficient d33. If the applied voltage is an alternating signal voltage, the resulting deformation changes accordingly. Therefore, when an audio AC voltage is applied, the piezoelectric element vibrates and produces sound, while also acting on the diaphragm, driving the diaphragm to vibrate and produce sound.

[0034] In summary, the embodiments of the present invention provide a receiver with a diaphragm supported by a central piezoelectric body. The receiver can be structurally simplified into two parts: a diaphragm assembly with a central rigid support; and a central piezoelectric body supporting the diaphragm, which is a cylindrical piezoelectric body with a fixed first end and a free second end. The shape of the diaphragm of the diaphragm assembly can be, but is not limited to, circular, oval, square, rectangular, or a racetrack oval-square shape. The diaphragm can be fixed on all sides, but for flat-panel systems, the diaphragm assembly with a central rigid support can also have a free boundary on all sides.

[0035] The receiver according to the embodiment of the present invention has the following advantages:

[0036] 1. The receiver of the present invention produces sound by vibrating a piezoelectric body and driving a diaphragm to vibrate. It has the advantages of low power consumption and high efficiency. It also has the advantages of simple structure, convenient manufacturing process, easy operation, and convenience for further miniaturization.

[0037] 2. When an audio AC voltage is applied to the receiver of the present invention, the piezoelectric element vibrates and produces sound. Simultaneously, the piezoelectric element acts on the diaphragm, driving the diaphragm to vibrate and produce sound. The piezoelectric element's vibration produces sound with good mid- and high-frequency response, but poor low-frequency characteristics. The frequency response of the piezoelectric element driving the diaphragm to vibrate has better low-frequency characteristics. The combination of these two elements creates a complementary effect in frequency response, achieving excellent sound quality across the entire low, mid, and high frequency ranges.

[0038] The technical solution of the present invention has been described in detail above through specific embodiments. In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in one embodiment, please refer to the relevant description of other embodiments.

[0039] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. A person skilled in the art may modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A receiver having a central piezoelectric body supporting a diaphragm, characterized in that: The invention comprises a shell, wherein a metal washer, a diaphragm assembly, an insulating gasket and a backing plate are sequentially encapsulated in the shell, and the diaphragm assembly comprises a metal diaphragm ring and a diaphragm adhered to the metal diaphragm ring; The housing is further provided with a piezoelectric body located between the backing plate and the diaphragm; a first end of the piezoelectric body is fixed to the inner surface of the backing plate and is electrically connected to a terminal provided on the outer surface of the backing plate; a second end of the piezoelectric body supports and is connected to the center of the diaphragm and is electrically connected to the housing through the diaphragm assembly; When an audio AC voltage is applied to the connection terminal and the housing, the piezoelectric body vibrates and produces sound, and the diaphragm vibrates and produces sound under the driving of the piezoelectric body; The inner surface of the pad has a first metal layer electrically connected to the piezoelectric body and insulated from the housing, and the outer surface has a second metal layer electrically connected to the terminal and insulated from the housing, the first metal layer and the second metal layer are electrically connected via a metallized through hole; The backing plate is a double-sided copper-clad plate having metal layers on both sides, and the metal layers on the edge areas of the double-sided copper-clad plate near the shell are etched away; The side of the diaphragm connected to the piezoelectric body has a metallized coating, and the end surfaces at both ends of the piezoelectric body both have a metallized coating; A needle-shaped contact is provided at the center of the diaphragm, and the needle-shaped contact is connected to the piezoelectric body via a conductive adhesive; the needle-shaped contact is specifically a metal part with a rivet structure or a rivet buckle structure, which is nailed or buckled on the diaphragm and then connected to the end surface of the piezoelectric body; The piezoelectric body is a cylindrical piezoelectric body.

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