Three-drive ultrathin broadband piezoelectric loudspeaker

Abstract

The invention discloses a three-drive ultrathin broadband piezoelectric loudspeaker, and the loudspeaker comprises a voice diaphragm vibration system which comprises a steel sheet; the first piezoelectric ceramic piece is attached to the steel piece; the first coupling piece is provided with a first bonding end and a first connecting end which are opposite, and the first bonding end is bonded with the steel sheet; the second coupling piece is provided with a second bonding end and a second connecting end which are opposite, and the second bonding end is bonded with the steel sheet; the first FPC flat cable is connected with the first piezoelectric ceramic piece; the second piezoelectric ceramic piece is connected with the first connecting end; the third piezoelectric ceramic piece is connected with the second connecting end; the second FPC flat cable is connected with the second piezoelectric ceramic piece; the third FPC flat cable is connected with the third piezoelectric ceramic piece; the loudspeaker frame is provided with a mounting cavity, and the voice diaphragm vibration system is arranged in the mounting cavity; and the dual suspension system is arranged on the loudspeaker frame and is provided with a first vibration cantilever and a second vibration cantilever which are respectively connected with the first vibration cantilever and the second vibration cantilever.

Description

Technical Field

[0001] The present invention relates to the technical field of loudspeakers, and in particular to a three-drive ultra-thin broadband piezoelectric loudspeaker. Background Art

[0002] Currently, mobile phones and computers on the market are gradually moving towards ultra-thin structures. This development trend requires that all related components must also be designed to be thinner. Therefore, speakers also need to become thinner. However, due to the structural limitations of the voice coil and magnet in the speaker, the thickness of the speaker is limited. Due to their inherent characteristics, pure ceramic speakers generally lack mid- and low-frequency performance. Although the design of a multi-layer ceramic drive screen can solve the low-frequency problem to a certain extent, it requires more energy to drive the screen, which means more ceramic layers and a larger area, which increases the cost. In order to meet market demand and solve these problems, it is urgent to find an effective solution. Summary of the Invention

[0003] The purpose of the present invention is to design a three-drive ultra-thin broadband piezoelectric speaker to address the problems existing in existing speakers, thereby solving the problems that existing speakers are too thick, cannot meet the requirements of thin design, do not have mid- and low-frequency performance, and are too expensive.

[0004] To achieve the above object, the present invention is achieved through the following technical solutions:

[0005] The present invention designs a three-drive ultra-thin broadband piezoelectric speaker, which includes the following structural settings:

[0006] The diaphragm vibration system, which includes a steel plate;

[0007] a first piezoelectric ceramic sheet having a multi-layer structure, wherein the first piezoelectric ceramic sheet is bonded to the steel sheet;

[0008] a first coupling member having a first bonding end and a first connecting end opposite to each other, wherein the first bonding end is bonded to the steel sheet;

[0009] a second coupling member having a second bonding end and a second connecting end opposite to each other, wherein the second bonding end is bonded to the steel sheet;

[0010] A first FPC cable, one end of which is connected to the first piezoelectric ceramic sheet and the other end is led out;

[0011] a second piezoelectric ceramic sheet having a multi-layer structure, wherein the first connecting end of the first coupling member is connected to the second piezoelectric ceramic sheet;

[0012] a third piezoelectric ceramic sheet having a multi-layer structure, wherein the second connecting end of the second coupling member is connected to the third piezoelectric ceramic sheet;

[0013] A second FPC cable, one end of which is connected to the second piezoelectric ceramic sheet and the other end is led out;

[0014] A third FPC cable, one end of which is connected to the third piezoelectric ceramic sheet and the other end is led out;

[0015] A speaker basin frame, wherein the center thereof has an installation cavity, and the sound membrane vibration system is arranged in the installation cavity;

[0016] And a double suspension system, which is arranged on the speaker basin frame, the double suspension system has a first vibration cantilever and a second vibration cantilever, and the second piezoelectric ceramic piece and the third piezoelectric ceramic piece are respectively connected to the first vibration cantilever and the second vibration cantilever.

[0017] Furthermore, a three-drive ultra-thin broadband piezoelectric speaker: the diaphragm vibration system includes the following structural settings:

[0018] Middle sticker;

[0019] A diaphragm having a first surface and a second surface opposite to each other, wherein the middle sticker is in contact with the first surface of the diaphragm;

[0020] and a steel sheet adhered to the second surface of the diaphragm.

[0021] Furthermore, a three-drive ultra-thin broadband piezoelectric speaker: the sound membrane vibration system also includes a backing glue; the steel sheet is adhered to the second surface of the vibration membrane through the backing glue.

[0022] Furthermore, a three-drive ultra-thin broadband piezoelectric speaker: the middle sticker is adhered to the first surface of the diaphragm by glue; the outer edge of the diaphragm is connected and fixed to the installation cavity by glue.

[0023] Furthermore, a three-drive ultra-thin broadband piezoelectric speaker: the first piezoelectric ceramic sheet is bonded to the steel sheet by glue.

[0024] Furthermore, a three-drive ultra-thin broadband piezoelectric speaker: the first bonding end of the first coupling member and the second bonding end of the second coupling member are respectively bonded to the steel sheet by glue.

[0025] Furthermore, a three-drive ultra-thin broadband piezoelectric speaker: the first FPC cable is connected to the first piezoelectric ceramic sheet through ACF glue; the second FPC cable is connected to the second piezoelectric ceramic sheet through ACF glue; the third FPC cable is connected to the third piezoelectric ceramic sheet through ACF glue.

[0026] Furthermore, a three-drive ultra-thin broadband piezoelectric speaker: the first piezoelectric ceramic sheet is set to a 10-25 layer structure, and the second piezoelectric ceramic sheet and the third piezoelectric ceramic sheet are respectively set to a 5-10 layer structure.

[0027] Furthermore, a three-drive ultra-thin broadband piezoelectric speaker: the double suspension system comprises: a bottom plate and a first vibration cantilever and a second vibration cantilever arranged side by side on the bottom plate;

[0028] The first vibration cantilever and the second vibration cantilever have the same structural setting, and are respectively approximately "U"-shaped structures formed by four "L"-shaped vibration arms.

[0029] Furthermore, a three-drive ultra-thin broadband piezoelectric speaker: the first vibration cantilever and the second vibration cantilever are made of a material with high elasticity, light weight, impact toughness and good fatigue resistance.

[0030] Beneficial effects of the present invention:

[0031] (1) The three-drive ultra-thin broadband piezoelectric loudspeaker designed by the present invention has low-frequency characteristics: the piezoelectric loudspeaker of the present invention adopts a double-suspension structural design, and the vibration suspension material (the first and second vibration cantilevers) has high elasticity, light weight, impact toughness and good fatigue resistance. Its soft characteristics greatly reduce the frequency of the piezoelectric loudspeaker, making it have a better low-frequency effect. At the same time, the use of dual piezoelectric ceramic sheets (the second and third piezoelectric ceramic sheets) in combination with the double suspension structure makes up for its shortcoming of insufficient low-frequency sound pressure.

[0032] (2) The three-drive ultra-thin broadband piezoelectric loudspeaker designed by the present invention has mid-to-high frequency characteristics: the piezoelectric loudspeaker of the present invention adopts a structural design in which a piezoelectric ceramic sheet (a first piezoelectric ceramic sheet) is separately bonded to the loudspeaker diaphragm vibration system. The stainless steel sheet in the diaphragm vibration system provides necessary support for the piezoelectric ceramic sheet, making its vibration more stable and avoiding energy loss caused by other modal vibrations and reducing the sound pressure level; at the same time, the middle sticker in the diaphragm vibration system more effectively balances the vibration frequency, so that the piezoelectric loudspeaker obtains better mid-to-low frequency effects without losing the high-frequency characteristics of the piezoelectric loudspeaker.

[0033] (3) The three-drive ultra-thin broadband piezoelectric loudspeaker designed by the present invention has a thinner characteristic: compared with traditional magnetoelectric loudspeakers of the same performance, the piezoelectric loudspeaker of the present invention is about 0.7 mm thinner than the thinnest magnetoelectric loudspeaker on the market; the second and third multi-layer piezoelectric ceramic sheets designed in the piezoelectric loudspeaker of the present invention work in conjunction with the double suspension system, and a first piezoelectric ceramic sheet that fits the sound model vibration system is added between the coupling of the two piezoelectric ceramic sheets and the diaphragm, which saves space and tends to a thinner structural design. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 An exploded diagram of a three-drive ultra-thin broadband piezoelectric speaker designed for Example 1 of the present invention;

[0036] Figure 2 Schematic diagram of the structure of the dual suspension system in Example 1 of the present invention.

[0037] The following are marked in the figure:

[0038] 1-sound membrane vibration system, 2-first piezoelectric ceramic sheet, 3-first coupling piece, 4-second coupling piece, 5-first FPC cable, 6-second piezoelectric ceramic sheet, 7-third piezoelectric ceramic sheet, 8-second FPC cable, 9-third FPC cable, 10-speaker basin, 11-double suspension system, 12-bottom plate, 13-first vibration cantilever, 14-second vibration cantilever, 15-vibration support arm, 101-installation cavity, 111-middle patch, 112-diaphragm, 113-back glue, 114-steel sheet. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying 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. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0041] Example 1

[0042] like Figures 1-2 As shown, in this embodiment 1, a three-drive ultra-thin broadband piezoelectric speaker is designed. The piezoelectric speaker includes the following specific structural settings:

[0043] The diaphragm vibration system 1 includes a center sticker 111, a diaphragm 112, adhesive backing 113, and a stainless steel sheet 114. The diaphragm 112 has a first surface and a second surface (not shown) facing each other. The center sticker 111 is adhered to the first surface of the diaphragm 112 by adhesive, and the steel sheet 114 is adhered to the second surface of the diaphragm 112 by adhesive backing 113.

[0044] A first piezoelectric ceramic sheet 2 having a multi-layer structure, wherein the first piezoelectric ceramic sheet 2 is bonded to a surface of the steel sheet 114 facing away from the diaphragm 112 by glue;

[0045] A first coupling member 3 having a first bonding end and a first connecting end (not shown) opposite to each other, wherein the first bonding end is bonded to the steel sheet 114 by glue;

[0046] A second coupling member 4 having a second bonding end and a second connecting end (not shown) opposite to each other, wherein the second bonding end is bonded to the steel sheet 114 by glue;

[0047] A first FPC cable 5, one end of which is connected to the first piezoelectric ceramic sheet 2 via ACF glue, and the other end is led out;

[0048] A second piezoelectric ceramic sheet 6 is provided with a multi-layer structure, and the other end (i.e., the first connecting end) of the first coupling member 3 is connected to the second piezoelectric ceramic sheet 6;

[0049] A third piezoelectric ceramic sheet 7 is provided with a multi-layer structure, and the other end (i.e., the second connecting end) of the second coupling member 4 is connected to the third piezoelectric ceramic sheet 7;

[0050] A second FPC cable 8, one end of which is connected to the second piezoelectric ceramic sheet 6 via ACF glue, and the other end is led out;

[0051] A third FPC cable 9, one end of which is connected to the third piezoelectric ceramic sheet 7 via ACF glue, and the other end is led out;

[0052] The speaker frame 10 has a mounting cavity 101 in the middle thereof, and the diaphragm vibration system 1 is disposed in the mounting cavity 101 , specifically, the outer edge of the diaphragm 112 is connected and fixed to the mounting cavity 101 by glue;

[0053] and a dual suspension system 11, comprising a base plate 12 and a first vibration cantilever 13 and a second vibration cantilever 14 arranged side by side on the base plate 12, wherein the base plate 12 is arranged on the speaker basket 10 and the first vibration cantilever 13 and the second vibration cantilever 14 are located in the mounting cavity 101, and one surface of the second piezoelectric ceramic plate 6 and the third piezoelectric ceramic plate 7 are respectively connected to the first vibration cantilever 13 and the second vibration cantilever 14 by glue;

[0054] Among them, the first vibration cantilever 13 and the second vibration cantilever 14 have the same structural setting, which are respectively composed of four "L"-shaped vibration support arms 15, each of which is an approximately "U"-shaped structure. The first vibration cantilever 13 and the second vibration cantilever 14 are made of a material with high elasticity, light weight, impact toughness and good fatigue resistance.

[0055] Specifically, the first piezoelectric ceramic sheet 2 in the above embodiment 1 is configured as a 20-layer structure, and the second piezoelectric ceramic sheet 6 and the third piezoelectric ceramic sheet 7 are configured as an 8-layer structure respectively.

[0056] Specifically, the center sticker 11 of the piezoelectric speaker in Example 1 is glued to the diaphragm 112, and the stainless steel sheet 114 is connected to the diaphragm 112 via adhesive 113. Together, these structures constitute the diaphragm vibration system 1. The first piezoelectric ceramic sheet 2 is glued to the stainless steel sheet 114 in the diaphragm vibration system 1. One end of the first and second coupling members 3 and 4 are glued to the stainless steel sheet 114 in the diaphragm vibration system 1, while the other ends are connected to the second and third piezoelectric ceramic sheets 6 and 7, respectively. One end of the first FPC cable 5 is connected to the first piezoelectric ceramic sheet 2 via ACF glue. One end of the second and third FPC cables 8 and 9 are also glued to the second and third piezoelectric ceramic sheets 6 and 7, respectively, via ACF glue. The speaker frame 10 is glued to the edge of the diaphragm 12 in the diaphragm vibration system 1. The base plate 12 of the double suspension system 11 is glued to the speaker frame 10. The bottom ends of the second and third piezoelectric ceramic sheets 6 and 7 are connected to the first and second vibration cantilevers 13 and 14 in the double suspension system 11 through glue.

[0057] Specifically, the first piezoelectric ceramic sheet 2 and the steel sheet 114 in Example 1 serve as vibration system I, and the second piezoelectric ceramic sheet 6, the third piezoelectric ceramic sheet 7 and the double suspension system 11 serve as vibration system II; when the two electrodes on the three FPC cable lead-out ends of the first FPC cable 5, the second FPC cable 8 and the third FPC cable 9 are connected to an electrical signal, the two multilayer piezoelectric ceramic sheets (the second and third piezoelectric ceramic sheets 6 and 7) in vibration system II and one multilayer piezoelectric ceramic sheet (the first piezoelectric ceramic sheet 2) in vibration system I vibrate simultaneously, converting electrical energy into mechanical energy through the piezoelectric effect, and the vibration system II transmits the energy to the sound membrane vibration system 1 through the first coupling member 3 and the second coupling member 4, while the vibration system I directly transmits the energy to the sound membrane vibration system 1, and the vibration system I and the vibration system II together drive the sound membrane vibration system 1 to vibrate, thereby generating an amplitude that drives the air to generate sound waves.

[0058] Compared to traditional magnetoelectric speakers, the three-drive, ultra-thin, broadband piezoelectric speaker designed in Example 1 of the present invention is significantly thinner: the voice coil and magnet are replaced with two 0.2mm thick second and third piezoelectric ceramic sheets, each with a thickness of 0.2mm, and a dual suspension system with a thickness of 0.2mm. Currently, the lowest thickness of traditional magnetoelectric speakers on the market is approximately 1.9mm, while the new piezoelectric speaker designed in Example 1 can be as thin as 1.2mm, achieving a significantly thinner design. This ultra-thin design effectively addresses the challenges currently faced by mobile phones and laptops in their pursuit of thin and lightweight designs, offering significant technical advantages.

[0059] Furthermore, the dual piezoelectric ceramic plates and dual suspension design provide the piezoelectric speaker with low-frequency amplitude. The design of the first piezoelectric ceramic plate (2) bonded to the steel plate (114) and then to the center plate (11) suppresses the sound pressure at low and mid-range frequencies while boosting the sound pressure at mid-range frequencies. Simultaneously, the first piezoelectric ceramic plate (2) also provides high-frequency sound pressure, achieving full-band sound generation.

[0060] The above preferred embodiments of the present invention are only used to explain the present invention and are not used to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A three-drive ultra-thin broadband piezoelectric speaker, characterized in that: The piezoelectric speaker includes the following structural configuration: A diaphragm vibration system (1), comprising a steel sheet (114); A first piezoelectric ceramic sheet (2) is provided as a multi-layer structure, wherein the first piezoelectric ceramic sheet (2) is bonded to the steel sheet (114); a first coupling member (3) having a first bonding end and a first connecting end opposite to each other, wherein the first bonding end is bonded to the steel sheet (114); a second coupling member (4) having a second bonding end and a second connecting end opposite to each other, wherein the second bonding end is bonded to the steel sheet (114); A first FPC cable (5), one end of which is connected to the first piezoelectric ceramic sheet (2) and the other end of which is led out; A second piezoelectric ceramic sheet (6) is provided as a multi-layer structure, wherein the first connection end of the first coupling member (3) is connected to the second piezoelectric ceramic sheet (6); A third piezoelectric ceramic sheet (7) is provided as a multi-layer structure, and the second connection end of the second coupling member (4) is connected to the third piezoelectric ceramic sheet (7); A second FPC cable (8), one end of which is connected to the second piezoelectric ceramic sheet (6) and the other end of which is led out; A third FPC cable (9), one end of which is connected to the third piezoelectric ceramic sheet (7) and the other end of which is led out; A speaker basin frame (10) has a mounting cavity (101) in its center, and the diaphragm vibration system (1) is arranged in the mounting cavity (101); And a double suspension system (11) is arranged on the speaker basin frame (10), wherein the double suspension system (11) comprises a first vibration cantilever (13) and a second vibration cantilever (14), and the second piezoelectric ceramic piece (6) and the third piezoelectric ceramic piece (7) are respectively connected to the first vibration cantilever (13) and the second vibration cantilever (14).

2. The three-drive ultra-thin broadband piezoelectric speaker according to claim 1, characterized in that: The diaphragm vibration system (1) includes the following structural arrangements: Zhongtie (111); A diaphragm (112) having a first surface and a second surface opposite to each other, wherein the middle sticker (111) is attached to the first surface of the diaphragm (112); and a steel sheet (114) adhered to the second surface of the diaphragm (112).

3. The three-drive ultra-thin broadband piezoelectric speaker according to claim 2, characterized in that: The sound membrane vibration system (1) further includes adhesive (113); The steel sheet (114) is adhered to the second surface of the diaphragm (112) via the adhesive (113).

4. The three-drive ultra-thin broadband piezoelectric speaker according to claim 2, characterized in that: The middle sticker (111) is adhered to the first surface of the diaphragm (112) by glue; and the outer edge of the diaphragm (112) is connected and fixed to the installation cavity (101) by glue.

5. The three-drive ultra-thin broadband piezoelectric speaker according to claim 1, characterized in that: The first piezoelectric ceramic sheet (2) is bonded to the steel sheet (114) by glue.

6. The three-drive ultra-thin broadband piezoelectric speaker according to claim 1, characterized in that: The first bonding end of the first coupling member (3) and the second bonding end of the second coupling member (4) are respectively bonded to the steel sheet (114) by glue.

7. The three-drive ultra-thin broadband piezoelectric speaker according to claim 1, characterized in that: The first FPC cable (5) is connected to the first piezoelectric ceramic sheet (2) via ACF glue; the second FPC cable (8) is connected to the second piezoelectric ceramic sheet (6) via ACF glue; and the third FPC cable (9) is connected to the third piezoelectric ceramic sheet (7) via ACF glue.

8. The three-drive ultra-thin broadband piezoelectric speaker according to claim 1, characterized in that: The first piezoelectric ceramic sheet (2) is configured as a 10-25 layer structure, and the second piezoelectric ceramic sheet (6) and the third piezoelectric ceramic sheet (7) are configured as a 5-10 layer structure respectively.

9. The three-drive ultra-thin broadband piezoelectric speaker according to claim 1, characterized in that: The double suspension system (11) comprises: a base plate (12) and a first vibration cantilever (13) and a second vibration cantilever (14) arranged side by side on the base plate (12); The first vibration cantilever (13) and the second vibration cantilever (14) have the same structural arrangement, and are respectively a "U"-shaped structure formed by four "L"-shaped vibration support arms (15).

10. The three-drive ultra-thin broadband piezoelectric speaker according to claim 1 or 9, characterized in that: The first vibration cantilever (13) and the second vibration cantilever (14) are made of a material with high elasticity, light weight, impact toughness and good fatigue resistance.

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