CN220422050U - Piezoelectric sheet, sounding monomer, sounding module and electronic equipment - Google Patents

Abstract

The application belongs to electroacoustic conversion equipment technical field, concretely relates to piezoelectric patch, sound production monomer, sound production module and electronic equipment. The piezoelectric sheet of this application includes metal basic unit and piezoelectricity layer, and metal basic unit includes outer supporting part and interior supporting part, and the outside of interior supporting part is located to outer supporting part cover and is set up with interior supporting part interval, is connected through at least one linking arm between outer supporting part and the interior supporting part, and piezoelectricity layer stacks the setting along the direction of the face of perpendicular to metal basic unit with metal basic unit to with interior supporting part laminating is connected. According to the piezoelectric sheet, the inner supporting part and the outer supporting part are connected through the connecting arm, so that the stress born by the outer supporting part in the vibration process of the piezoelectric sheet can be buffered, the overall compliance of the piezoelectric sheet is improved, the resonance frequency F0 of the piezoelectric sheet is reduced, and the vibration sounding performance of the piezoelectric sheet is improved.

Description

Piezoelectric sheet, sounding monomer, sounding module and electronic equipment

Technical Field

The application belongs to electroacoustic conversion equipment technical field, concretely relates to piezoelectric patch, sound production monomer, sound production module and electronic equipment.

Background

The piezoelectric loudspeaker is one electroacoustic transducer and has piezoelectric plate as the main sound producing structure. The piezoelectric sheet generally comprises a metal base layer and a ceramic layer, wherein a silver coating is coated on the surface of the ceramic layer, the ceramic layer is stuck on the metal base layer after polarization treatment to form a piezoelectric ceramic buzzer, and when the ceramic layer and the metal base layer are respectively applied with a voltage, the piezoelectric ceramic buzzer can generate mechanical deformation and vibration sounding due to piezoelectric effect.

The metal base layer in the prior art is used for supporting the ceramic layer to vibrate, has great rigidity, and therefore the compliance of the metal base layer is poor, and the piezoelectric loudspeaker has a large resonant frequency F0. The bass sensitivity of the piezoelectric horn is deteriorated due to the larger resonance frequency F0, thereby affecting the sounding performance of the piezoelectric horn.

Disclosure of Invention

The purpose of this application is at least to solve the problem that reduces piezoelectric horn sound production performance because the rigidity of metal basic unit is big. This object is achieved by:

a first aspect of the present application proposes a piezoelectric sheet, the piezoelectric sheet comprising:

the metal base layer comprises an outer supporting part and an inner supporting part, the outer supporting part is sleeved outside the inner supporting part and is arranged at intervals with the inner supporting part, and the outer supporting part is connected with the inner supporting part through at least one connecting arm;

and the piezoelectric layer is stacked with the metal base layer along the direction perpendicular to the plate surface of the metal base layer and is in fit connection with the inner supporting part.

According to the piezoelectric sheet of this application, set up the metal basic unit into outer supporting part and interior supporting part, outer supporting part has sufficient rigid support piezoelectric sheet vibration to improve the high-frequency vibration sound production performance of piezoelectric sheet, and interior supporting part laminating is equipped with the piezoceramics layer, and link to each other with outer supporting part through the linking arm, thereby can cushion the stress that outer supporting part received at the vibration in-process of piezoelectric sheet, with the whole compliance that improves the piezoelectric sheet, reduce the resonant frequency F0 of piezoelectric sheet, and then improve the vibration sound production performance of piezoelectric sheet.

In addition, the piezoelectric sheet according to the present application may have the following additional technical features:

in some embodiments of the present application, the at least one connecting arm includes a plurality of connecting arms, a plurality of connecting arms are disposed between the outer support portion and the inner support portion in a surrounding manner and are disposed at intervals, and any one of the connecting arms is connected to the outer support portion and the inner support portion respectively.

In some embodiments of the present application, the connecting arm includes an arc section, and a first connecting section and a second connecting section disposed at two ends of the arc section, the first connecting section is connected to an inner wall surface of the outer support portion, and the second connecting section is connected to an inner wall surface of the inner support portion.

In some embodiments of the present application, the radius angle a corresponding to the arc segment has a value ranging from 15 DEG to less than or equal to a < 75 deg.

In some embodiments of the present application, a projected area of the inner support portion is equal to or larger than a projected area of the piezoelectric layer along a direction perpendicular to a plate surface of the metal base layer.

In some embodiments of the present application, the piezoelectric layer includes a ceramic layer, a first conductive layer and a second conductive layer, the first conductive layer is attached to the ceramic layer on a side facing away from the metal base layer, the second conductive layer is attached to the ceramic layer on a side facing toward the metal base layer, and the second conductive layer is connected to the inner support portion.

A second aspect of the present application proposes a sounding monomer, the sounding monomer includes any one of the piezoelectric sheets of the first aspect of the present application, the sounding monomer further includes a housing, an acoustic cavity is formed inside the housing, the housing further is formed with an opening that is communicated with the acoustic cavity, the piezoelectric sheet is connected with the housing and is used for blocking the opening, wherein the piezoelectric layer is disposed on one side of the metal base layer facing away from the acoustic cavity.

The third aspect of this application provides a sound production module, sound production module includes the sound production monomer of the second aspect of this application, sound production module still includes the module shell, the inside of module shell is formed with the inner chamber, the module shell still be formed with the sound production passageway that the inner chamber is linked together, sound production monomer is located the inner chamber, the piezoelectric sheet with the sound production passageway sets up relatively.

In some embodiments of the third aspect of the present application, the housing is provided with an acoustic hole that is in communication with the acoustic cavity, and the acoustic unit is connected with an inner wall surface of the inner cavity and divides the inner cavity into a front cavity and a rear cavity, the front cavity is in communication with the acoustic channel, and the acoustic hole is in communication with the rear cavity.

A fourth aspect of the present application proposes an electronic device comprising the sound emitting module of the third aspect of the present application.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. Wherein:

FIG. 1 is a schematic diagram of a sound producing monomer according to an embodiment of the present application;

FIG. 2 is a schematic A-A cross-sectional view of a sound emitting unit according to an embodiment of the present application;

FIG. 3 is a schematic diagram of an exploded construction of a sound emitting unit according to an embodiment of the present application;

fig. 4 is a schematic structural view of a piezoelectric sheet according to an embodiment of the present application;

fig. 5 is a schematic structural view of a metal base layer according to an embodiment of the present application.

The reference numerals in the drawings are as follows:

100. a sounding monomer;

1. a piezoelectric sheet;

10. a metal base layer; 11. an outer support portion; 12. an inner support part; 13. a connecting arm; 131. an arc section; 132. a first connection section; 133. a second connection section;

20. a piezoelectric layer; 21. a ceramic layer; 22. a first conductive layer; 23. a second conductive layer;

2. a housing; 201. an acoustic cavity; 202. an acoustic aperture;

3. and an adhesive member.

Detailed Description

Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, in the context of this specification, when an element is referred to as being "on" another element, it can be directly on the other element or be indirectly on the other element with one or more intervening elements interposed therebetween. Also, in the context of this specification, when an element is referred to as being "connected" or "coupled" or "attached" to another element, it can be directly connected or coupled or attached to the other element or be indirectly connected, coupled or attached to the other element with one or more intervening elements interposed therebetween. In addition, when an element is referred to as being "engaged" with another element, it can be directly engaged or contacted with the other element or be indirectly engaged or contacted with the other element with one or more intervening elements interposed therebetween.

Spatially relative terms, such as "inner," "outer," "lower," "upper," and the like, may also be used herein to describe one element's or feature's relationship to another element's or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

In order to solve at least because the rigidity of metal basic unit leads to reducing the problem of piezoelectricity loudspeaker sound production performance greatly, this application has proposed a piezoelectricity piece, has the single sound production module of this sound production monomer of this piezoelectricity piece, and has the electronic equipment of this sound production module. The electronic device may be a plurality of electronic devices with sound producing functions, such as an earphone, a mobile phone, a tablet computer, etc., which are not exemplified here.

Referring to fig. 1 to 5, in some embodiments of the present application, a piezoelectric sheet 1 includes a metal base layer 10 and a piezoelectric layer 20, the metal base layer 10 includes an outer support portion 11 and an inner support portion 12, the outer support portion 11 is sleeved outside the inner support portion 12 and is disposed at intervals with the inner support portion 12, the outer support portion 11 and the inner support portion 12 are connected by at least one connecting arm 13, and the piezoelectric layer 20 and the metal base layer 10 are stacked in a direction perpendicular to a plate surface of the metal base layer 10 and are bonded and connected with the inner support portion 12.

Specifically, the piezoelectric sheet 1 may be used for vibration sounding of the sounding unit 100, and the sounding unit 100 may be a piezoelectric horn. The metal base layer 10 and the piezoelectric layer 20 correspond to one electrode, respectively, and are connected to an ac signal source through leads. When alternating current signals are introduced into the metal base layer 10 and the piezoelectric layer 20, a piezoelectric effect is generated, the piezoelectric layer 20 drives the metal base layer 10 to deform and vibrate together, and the vibration of the piezoelectric layer 20 and the metal base layer 10 drives surrounding air to vibrate and sound. The outer contour of the metal base layer 10 may be determined according to the shape of the housing 2 of the sounding unit 100, in one embodiment of the present application, the housing 2 of the sounding unit 100 is of a substantially cylindrical structure, the acoustic cavity 201 is formed inside the housing 2, an opening communicating with the acoustic cavity 201 is disposed at one end of the housing 2 along the axial direction of the cylindrical structure, and the piezoelectric sheet 1 is connected with the housing 2 and is used for sealing the opening. Therefore, the outer contour of the metal base layer 10 has a disk-like structure, and the outer contour of the piezoelectric layer 20 has a disk-like structure.

The outer support 11 is for connection with the housing 2, thereby for supporting the piezoelectric sheet 1 for vibration. The inner support 12 is used for being attached to the piezoelectric layer 20, and at least one side of the piezoelectric layer 20 is provided with a conductive layer, so that a piezoelectric effect can occur between the metal base 10 and the piezoelectric layer 20. The piezoelectric layer 20 may be adhesively connected to the inner support 12, and the outer support 11 may be adhesively connected to the housing 2. Specifically, the outer support portion 11 may be directly connected to the case 2 by using an adhesive, or the outer support portion 11 may be connected to the case 2 by using an adhesive 3, both sides of the adhesive 3 disposed opposite to each other have an adhesive, and both sides of the adhesive disposed opposite to each other are bonded to the case 2 and the outer support portion 11, respectively, so that vibration of the piezoelectric sheet 1 is buffered by the adhesive 3.

According to the piezoelectric sheet 1 of this application, set up metal basic unit 10 into outer supporting part 11 and interior supporting part 12, outer supporting part 11 has sufficient rigid support piezoelectric sheet 1 vibration to improve the high-frequency vibration sound production performance of piezoelectric sheet 1, and interior supporting part 12 laminating is equipped with piezoelectric layer 20, and link to each other with outer supporting part 11 through linking arm 13, thereby can cushion the stress that outer supporting part 11 received at the vibration in-process of piezoelectric sheet 1, with the whole compliance that improves piezoelectric sheet 1, reduce the resonant frequency F0 of piezoelectric sheet 1, and then improve the vibration sound production performance of piezoelectric sheet 1.

As shown in connection with fig. 4 and 5, in some embodiments of the present application, at least one connecting arm 13 includes a plurality of connecting arms 13, the plurality of connecting arms 13 are disposed between the outer support 11 and the inner support 12 in a surrounding manner and spaced apart, and any one of the connecting arms 13 connects the outer support 11 and the inner support 12, respectively.

The plurality of connecting arms 13 connect the outer support 11 and the inner support 12 together, so that the stability of the inner support 12 and the piezoelectric layer 20 when vibrating can be improved.

As shown in connection with fig. 4 and 5, in some embodiments of the present application, the connection arm 13 includes an arc-shaped section 131, and a first connection section 132 and a second connection section 133 provided at both ends of the arc-shaped section 131, the first connection section 132 being connected to the inner wall surface of the outer support 11, and the second connection section 133 being connected to the inner wall surface of the inner support 12.

The arc-shaped section 131 can provide better damping effect than the straight line section to further buffer the stress that the outer supporting part 11 receives in the vibration process of the piezoelectric sheet 1, so as to improve the overall compliance of the piezoelectric sheet 1, reduce the resonant frequency F0 of the piezoelectric sheet 1, and further improve the vibration sounding performance of the piezoelectric sheet 1. Specifically, the arc segment 131 may be a circular arc segment.

Meanwhile, in order to facilitate the connection of the arc-shaped section 131 with the outer support portion 11 and the inner support portion 12, a first connection section 132 and a second connection section 133 are respectively disposed at two ends of the arc-shaped section 131, and the first connection section 132 and the second connection section 133 may be arc-shaped sections, or the first connection section and the second connection section may be straight-line sections.

As shown in connection with fig. 4 and 5, in some embodiments of the present application, the radius angle a corresponding to the arcuate segment 131 has a value in the range of 15 +.ltoreq.a < +.ltoreq.75.

Specifically, the central angle a may take any angle value of 15 °.25 °.50 °.75 °. When the central angle a is smaller than 15 degrees, the arc-shaped section 131 is undersized, and the damping effect is reduced. When the central angle a is greater than 75 °, the arc segment 131 is oversized, and occupies too much space between the outer support 11 and the inner support 12, thereby reducing the shock absorbing effect.

As shown in fig. 4 and 5, in some embodiments of the present application, the projected area of the inner support 12 is equal to or larger than the projected area of the piezoelectric layer 20 in a direction perpendicular to the plate surface of the metal base layer 10.

Specifically, the direction perpendicular to the plate surface of the metal base layer 10 is the vibration direction of the piezoelectric sheet 1. By setting the projection area of the inner support 12 to be equal to or larger than the projection area of the piezoelectric layer 20 along the vibration direction, the piezoelectric layer 20 can be completely bonded to the inner support 12, thereby improving the vibration effect of the piezoelectric sheet 1.

As shown in conjunction with fig. 2 and 3, in some embodiments of the present application, the piezoelectric layer 20 includes a ceramic layer 21, a first conductive layer 22 and a second conductive layer 23, where the first conductive layer 22 is laminated on a side of the ceramic layer 21 facing away from the metal base layer 10, the second conductive layer 23 is laminated on a side of the ceramic layer 21 facing toward the metal base layer 10, and the second conductive layer 23 is connected to the inner support 12.

Specifically, the first conductive layer 22 and the second conductive layer 23 may be silver layers, respectively, and silver is coated on both sides of the ceramic layer 21 and plays a conductive role by using a silver brushing process on both sides of the ceramic layer 21, respectively. In some embodiments of the present application, the conductive layer may be provided on only one side of the ceramic layer 21, but the conductive effect is less reliable than providing the conductive layer on both sides separately. The second conductive layer 23 is adhered to the side of the ceramic layer 21 facing the metal base layer 10, and can be connected to the inner support 12 by adhesion.

Referring to fig. 1 to 3, a sounding unit 100 is provided in a second aspect of the present application, where the sounding unit 100 includes a piezoelectric sheet 1 in any of the foregoing embodiments, the sounding unit 100 further includes a housing 2, an acoustic cavity 201 is formed in the housing 2, an opening communicating with the acoustic cavity 201 is further formed in the housing 2, the piezoelectric sheet 1 is connected to the housing 2 and is used for sealing the opening, and the piezoelectric layer 20 is disposed on a side of the metal base layer 10 facing away from the acoustic cavity 201.

When alternating current signals are introduced into the metal base layer 10 and the piezoelectric layer 20, a piezoelectric effect is generated, the piezoelectric layer 20 drives the metal base layer 10 to deform and vibrate together, and the vibration of the piezoelectric layer 20 and the metal base layer 10 drives surrounding air to vibrate and sound, so that the sound production monomer 100 produces sound.

Referring to fig. 1 to 3, a sounding module (not shown in the drawings) is provided in a third aspect of the present application, the sounding module includes a sounding unit 100 in a second aspect of the present application, the sounding module further includes a module housing, an inner cavity is formed in the module housing, a sounding channel communicated with the inner cavity is further formed in the module housing, the sounding unit 100 is disposed in the inner cavity, and the piezoelectric sheet 1 is disposed opposite to the sounding channel.

Through the vibration sound production of the piezoelectric sheet 1 of the sound production monomer 100, the sound wave of sending can be transmitted to the outside of the module shell through the sound production channel, thereby realizing the sound production of the sound production module.

As shown in connection with fig. 1 to 3, in some embodiments of the third aspect of the present application, the housing 2 is provided with an acoustic port 202 communicating with the acoustic cavity 201, the acoustic cell 100 is connected to an inner wall surface of the inner cavity and divides the inner cavity into a front cavity and a rear cavity, the front cavity is communicated with the acoustic channel, and the acoustic port 202 is communicated with the rear cavity.

Specifically, the sound hole 202 may be provided on the bottom surface of the case 2 away from the piezoelectric sheet 1, or on the side surface of the case 2 between the bottom surface and the piezoelectric sheet 1. Through setting up sound hole 202 intercommunication back chamber and sound cavity 201 to be linked together through front chamber and sound production passageway, thereby can realize the double-sided sound production of sound production module, and then improve the sound production performance of sound production module.

A fourth aspect of the present application proposes an electronic device (not shown in the figures) comprising the sound emitting module of the third aspect of the present application.

The electronic device may be a plurality of electronic devices with sound producing functions, such as an earphone, a mobile phone, a tablet computer, etc., which are not exemplified here.

The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A piezoelectric sheet, characterized by comprising:

the metal base layer comprises an outer supporting part and an inner supporting part, the outer supporting part is sleeved outside the inner supporting part and is arranged at intervals with the inner supporting part, and the outer supporting part is connected with the inner supporting part through at least one connecting arm;

and the piezoelectric layer is stacked with the metal base layer along the direction perpendicular to the plate surface of the metal base layer and is in fit connection with the inner supporting part.

2. The piezoelectric sheet according to claim 1, wherein the at least one connecting arm includes a plurality of connecting arms, the plurality of connecting arms are disposed in a loop between the outer support portion and the inner support portion at intervals, and any one of the connecting arms connects the outer support portion and the inner support portion, respectively.

3. The piezoelectric sheet according to claim 2, wherein the connecting arm includes an arc-shaped section, and a first connecting section and a second connecting section provided at both ends of the arc-shaped section, the first connecting section being connected to an inner wall surface of the outer support portion, the second connecting section being connected to an inner wall surface of the inner support portion.

4. A piezoelectric sheet according to claim 3, wherein the radius angle a of the arc segment is 15 ° -a < 75 °.

5. The piezoelectric sheet according to any one of claims 1 to 4, wherein a projected area of the inner support portion is equal to or larger than a projected area of the piezoelectric layer in a direction perpendicular to a plate surface of the metal base layer.

6. The piezoelectric sheet according to any one of claims 1 to 4, wherein the piezoelectric layer includes a ceramic layer, a first conductive layer and a second conductive layer, the first conductive layer is laminated on a side of the ceramic layer facing away from the metal base layer, the second conductive layer is laminated on a side of the ceramic layer facing toward the metal base layer, and the second conductive layer is connected to the inner support portion.

7. A sounding monomer, characterized in that, include the piezoelectric sheet of any one of claims 1 to 6, sounding monomer still includes the casing, the inside of casing forms the sound cavity, the casing still is formed with the opening that the sound cavity is linked together, the piezoelectric sheet with the casing links to each other and is used for shutoff the opening, wherein, the piezoelectricity layer is located the metal basic unit deviates from the one side of sound cavity.

8. The sounding module is characterized by comprising the sounding monomer according to claim 7, the sounding module further comprises a module shell, an inner cavity is formed in the module shell, a sounding channel communicated with the inner cavity is further formed in the module shell, the sounding monomer is arranged in the inner cavity, and the piezoelectric sheet and the sounding channel are oppositely arranged.

9. The sound generating module as recited in claim 8, wherein the housing is provided with a sound hole in communication with the sound cavity, the sound generating unit is connected to an inner wall surface of the inner cavity and divides the inner cavity into a front cavity and a rear cavity, the front cavity is in communication with the sound generating channel, and the sound hole is in communication with the rear cavity.

10. An electronic device comprising the sound emitting module of claim 8 or 9.