CN210431862U - Flexible membrane and transducer - Google Patents
Flexible membrane and transducer Download PDFInfo
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- CN210431862U CN210431862U CN201921450008.2U CN201921450008U CN210431862U CN 210431862 U CN210431862 U CN 210431862U CN 201921450008 U CN201921450008 U CN 201921450008U CN 210431862 U CN210431862 U CN 210431862U
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Abstract
The utility model provides a flexible membrane and transducer, this transducer includes: the flexible film and the piezoelectric structure clamping the flexible film; the piezoelectric structure comprises a substrate, a top plate and a pressing piece, wherein the substrate and the top plate are matched and fixed to embed the flexible film between the substrate and the top plate, and electrodes correspondingly connected with the conductive polarization films of the flexible film are embedded on a frame of the top plate; the compressing piece is matched with the top plate and is placed on the surface of the flexible film. Through compressing tightly the piece and supporting and placing in the flexible membrane on the surface with the roof, can be under the flexible membrane high pressure drive situation, the circular telegram of the electrically conductive polarization membrane through flexible membrane both sides makes piezoelectricity flexible membrane flexible, change its and compress tightly the degree of concavity between the piece internal gap, thereby produce the sound wave, simultaneously, the roof is cut apart into a plurality of regions with the flexible membrane and is adopted respectively to compress tightly a cooperation, on the one hand, the transducer structure equipment of being convenient for, on the other hand, flexible membrane vibration amplitude has been restricted, make it be difficult for the shatter, thereby the life-span of transducer has been prolonged.
Description
Technical Field
The utility model relates to an ultrasonic transducer technical field especially relates to a flexible membrane and transducer.
Background
Piezoelectric transducers typically comprise a piezoelectric transducing element formed by a layer of piezoelectric material arranged between two electrodes. Applying a voltage between the two electrodes creates an electric field in the piezoelectric layer, causing the piezoelectric layer to mechanically deform. Such electromechanical transduction effects may be used in various applications, for example to form electromechanical actuators, loudspeakers, ultrasound generators, and the like.
However, when the existing piezoelectric transducer is made large in size and used as a directional ultrasonic sound generating device, the service life of the flexible membrane is reduced due to the increase of the structure of the flexible membrane.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcomings of the prior art, an object of the present invention is to provide a flexible membrane and a transducer, which are used to solve the problem of the prior art that when the size of a piezoelectric transducer is increased, the flexible membrane is easy to break due to work, resulting in the reduction of the service life of the piezoelectric transducer.
To achieve the above and other related objects, the present invention provides a flexible film, comprising:
the flexible substrate is compounded with conductive polarization films on two sides of the flexible substrate; wherein the flexible substrate is a piezoelectric flexible film.
In an embodiment of the present invention, the piezoelectric flexible film is at least one of a polyvinylidene fluoride film and a zinc oxide piezoelectric film.
In an embodiment of the present invention, the flexible film adopts two piezoelectric flexible films and three conductive polarization films that are arranged alternately, or adopts two piezoelectric flexible films and five conductive polarization films that are arranged alternately.
In an embodiment of the present invention, the thickness ratio of the piezoelectric flexible film to the conductive polarization film ranges from 1 to 3.
Another object of the present invention is to provide a transducer, including:
the flexible membrane and a piezoelectric structure clamping the flexible membrane; the piezoelectric structure comprises a substrate, a top plate and a pressing piece, the substrate and the top plate are matched and fixed, the flexible film is embedded between the substrate and the top plate, and electrodes correspondingly connected with the conductive polarization films of the flexible film are embedded on a frame of the top plate; the pressing piece is matched with the top plate and is placed on the surface of the flexible film.
In an embodiment of the present invention, the flexible film is divided into a plurality of regions by the frame of the top plate, and each of the regions corresponding to the flexible film is provided with a pressing member.
In an embodiment of the present invention, the pressing member includes a metal plate and a metal sheet, the metal plate is embedded into the top plate frame and tightly attached to the flexible film to form a compacted structure, and the two ends of the metal sheet are placed in the corresponding grooves of the top plate frame and pressed into the metal plate.
In an embodiment of the present invention, one side of the metal plate contacting the flexible film is a saw-toothed shape.
In an embodiment of the present invention, the metal plate is an aluminum plate.
In an embodiment of the present invention, the metal sheet is a copper sheet.
As described above, the utility model discloses a flexible membrane and transducer has following beneficial effect:
the flexible membrane inlay in between basement and the roof, just basement and roof are supporting fixed, through compressing tightly a set of supporting with the roof and place in flexible membrane is on the surface, can be under the flexible membrane high pressure drive situation, through the flexible membrane both sides the conductive polarization membrane circular telegram impel piezoelectricity flexible membrane flexible, change its and compress tightly the depression degree between the piece internal gap to produce the sound wave, simultaneously, the roof will the flexible membrane is cut apart into a plurality of regions and is adopted respectively to compress tightly a cooperation, and on the one hand, the transducer structure of being convenient for is assembled, and on the other hand has restricted flexible membrane amplitude of vibration, makes it be difficult for the shatter, thereby has prolonged the life-span of transducer.
Drawings
FIG. 1 is a schematic view of a flexible membrane according to the present invention;
FIG. 2 is a schematic diagram of a transducer according to the present invention;
FIG. 3 shows a schematic diagram of a flexible membrane compaction configuration according to the present invention;
FIG. 4 is a schematic view of the metal plate embedded in the top plate according to the present invention;
fig. 5 shows that the utility model provides a flexible membrane inlays in roof structure sketch map.
Element number description:
1 Flexible film
2 base
3 Top board
4 Metal plate
5 Metal sheet
11 Flexible substrate
12 conductive polarization film
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
In the following description, reference is made to the accompanying drawings that describe several embodiments of the application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.
Although the terms first, second, etc. may be used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first steering oscillation may be referred to as a second steering oscillation, and similarly, the second steering oscillation may be referred to as a first steering oscillation, without departing from the scope of the various described embodiments.
Please refer to fig. 1, which is a schematic structural diagram of a flexible film according to the present invention, including:
at least one flexible substrate 11, and conductive polarization films 12 compounded on two sides of the flexible substrate 11; wherein, the flexible substrate 11 is a piezoelectric flexible film.
In this embodiment, the piezoelectric flexible film is at least one of a polyvinylidene fluoride film (PVDF) and a zinc oxide piezoelectric film. For example, the piezoelectric flexible film made of the polyvinylidene fluoride film has high chemical stability, low hygroscopicity, high thermal stability, high ultraviolet radiation resistance, high impact resistance and fatigue resistance, the chemical stability of the piezoelectric flexible film is 10 times higher than that of ceramic, the acoustic impedance of the piezoelectric flexible film is close to that of water, the matching state is good, and the application sensitivity is high; the PVDF piezoelectric film has high resonant frequency of stretching vibration in the thickness direction, can obtain wider flat response, and has frequency response width superior to that of a common piezoelectric ceramic transducer. In addition, the material is a zinc oxide piezoelectric film which has excellent piezoelectric, photoelectric, gas-sensitive and pressure-sensitive properties, and a high-quality monocrystal or polycrystal ZnO film with preferred c-axis orientation has excellent piezoelectric properties, so that the zinc oxide piezoelectric film can be used for preparing piezoelectric converters such as high-frequency fiber acousto-optic devices, ultrasonic and acousto-optic modulators and the like.
In another embodiment, the flexible film adopts two piezoelectric flexible films and three conductive polarization films which are arranged in a crossed manner, or adopts two piezoelectric flexible films and five conductive polarization films which are arranged in a crossed manner (for example, one conductive polarization film is respectively compounded on two sides of each layer of the flexible film, and one conductive polarization film is adopted as a separation layer in the middle of each layer of the flexible film), and the piezoelectric flexible film and the conductive polarization film can also be three layers or four layers, which is not further limited herein.
In another embodiment, the thickness ratio of the piezoelectric flexible film to the conductive polarization film ranges from 1 to 3, and the piezoelectric flexible film can be ensured to stretch after the conductive polarization film is subjected to high-voltage electric polarization by adopting the thickness ratio; on the other hand, on the premise of ensuring the above, the reduction of the thickness of the conductive polarized film does not influence the vibration sound production of the flexible film, and the use amount of the thickness of the conductive polarized film can be reduced.
Referring to fig. 2, for the present invention, an energy converter is provided, which includes:
the flexible film 1 and a piezoelectric structure clamping the flexible film; the piezoelectric structure comprises a substrate 2, a top plate 3 and a pressing piece, wherein the substrate and the top plate are matched and fixed (in the figure, screws are adopted, the like are adopted, and the like), the flexible film is embedded between the substrate 2 and the top plate 3, and electrodes (not shown in the figure) correspondingly connected with each conductive polarization film of the flexible film 1 are embedded on a frame of the top plate 3; the pressing piece is matched with the top plate 3 and is placed on the surface of the flexible membrane 1.
The material of the substrate 2 is not limited, and the substrate may be made of metal or nonmetal, and the flexible film is fixed by matching with the top plate.
In this embodiment, the flexible film is divided into a plurality of regions by the frame of the top plate, and a pressing member is provided in each region corresponding to the flexible film, and the flexible film is divided into a plurality of regions to realize distribution and pressing, specifically, as shown in fig. 5, the flexible film is divided into two regions by the top plate, which facilitates the assembly and installation of the ultrasonic transducer, and when the flexible film corresponding to the plurality of layers of flexible substrates is used, the flexible film is prevented from cracking due to the fixing structure, and the sound can be positively superimposed without being offset.
In another embodiment, the pressing member comprises a metal plate 4 and a metal sheet 5, the metal plate is embedded in the top plate frame and tightly attached to the flexible membrane to form a compacted structure, and two ends of the metal sheet are placed in corresponding grooves of the top plate frame and pressed in the metal plate, as shown in fig. 3, wherein one side of the metal plate contacting the flexible membrane is serrated.
In another embodiment, the metal plate 4 is an aluminum plate, wherein the aluminum plate is serrated on the side contacting the flexible membrane, and the flexible membrane can be limited in the front-back stretching distance by the serrations, so as to protect, as shown in fig. 4, the metal plate is embedded in the top plate on the side with the serrations.
In another embodiment, the metal sheet 5 is a copper sheet, and the copper sheet can enable an aluminum sheet to be completely pressed on the surface of the flexible film.
In the embodiment, because the flexible membrane is adopted to perform ultrasonic sound production by polarization electrification, compared with a matrix ultrasonic transducer, the frequency of the flexible membrane is easier to modulate, and the reduction degree of sound is higher.
To sum up, the utility model discloses in the flexible membrane inlay in between basement and the roof, just the basement is fixed with the roof is supporting, through compress tightly a supporting with the roof and place in the flexible membrane is on the surface, can be under the flexible membrane high pressure drive situation, through the flexible membrane both sides lead the electric polarization membrane circular telegram make piezoelectricity flexible membrane flexible, change its and compress tightly the degree of concavity between the piece internal gap to produce the sound wave, simultaneously, the roof will a plurality of regions are cut apart into to the flexible membrane and adopt respectively to compress tightly a cooperation, and on the one hand, the transducer structure of being convenient for assembles, and on the other hand has restricted flexible membrane amplitude of vibration, makes it be difficult for the shatter, thereby has prolonged the life-span of transducer. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A flexible film, comprising:
the flexible substrate is compounded with conductive polarization films on two sides of the flexible substrate;
the flexible substrate is a piezoelectric flexible film, and the flexible film adopts two layers of piezoelectric flexible films and three layers of conductive polarization films which are arranged in a crossed manner, or adopts two layers of piezoelectric flexible films and five layers of conductive polarization films which are arranged in a crossed manner.
2. The flexible membrane of claim 1, wherein the piezoelectric flexible membrane is at least one of a polyvinylidene fluoride membrane, a zinc oxide piezoelectric membrane.
3. The flexible film of claim 1, wherein the ratio of the thickness of the piezoelectric flexible film to the thickness of the conductive polarization film is in a range of 1-3.
4. A transducer comprising a flexible membrane according to any one of claims 1 to 3 and a piezoelectric structure clamping the flexible membrane; the piezoelectric structure comprises a substrate, a top plate and a pressing piece, the substrate and the top plate are matched and fixed, the flexible film is embedded between the substrate and the top plate, and electrodes correspondingly connected with the conductive polarization films of the flexible film are embedded on a frame of the top plate; the pressing piece is matched with the top plate and is placed on the surface of the flexible film.
5. The transducer of claim 4, wherein the flexible membrane is divided into a plurality of regions by a frame of the top plate, and each region of the flexible membrane is provided with a pressing member.
6. The transducer of claim 4 or 5, wherein the compressing member comprises a metal plate and a metal sheet, the metal plate is embedded in the top plate frame and tightly clings to the flexible membrane to form a compacted structure, and two ends of the metal sheet are placed in corresponding grooves of the top plate frame and pressed in the metal plate.
7. The transducer of claim 6, wherein the side of the metal plate contacting the flexible membrane is serrated.
8. The transducer of claim 6, wherein the metal plate is an aluminum plate.
9. The transducer of claim 6, wherein the metal sheet is a copper sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921450008.2U CN210431862U (en) | 2019-09-03 | 2019-09-03 | Flexible membrane and transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921450008.2U CN210431862U (en) | 2019-09-03 | 2019-09-03 | Flexible membrane and transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210431862U true CN210431862U (en) | 2020-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921450008.2U Active CN210431862U (en) | 2019-09-03 | 2019-09-03 | Flexible membrane and transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210431862U (en) |
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2019
- 2019-09-03 CN CN201921450008.2U patent/CN210431862U/en active Active
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