CN220691876U - Parallel plate capacitor capable of preventing film absorption - Google Patents
Parallel plate capacitor capable of preventing film absorption Download PDFInfo
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- CN220691876U CN220691876U CN202322305320.5U CN202322305320U CN220691876U CN 220691876 U CN220691876 U CN 220691876U CN 202322305320 U CN202322305320 U CN 202322305320U CN 220691876 U CN220691876 U CN 220691876U
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 title claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims 1
- 239000011800 void material Substances 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 239000000725 suspension Substances 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 abstract 1
- 230000008859 change Effects 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
The utility model relates to the technical field of cleaning devices and discloses a parallel plate capacitor capable of preventing film absorption. According to the utility model, the middle film covering area of the back electrode plate is removed, so that no electric charge and no adsorption force are generated when no film covering exists in the area easy to suck the film, the periphery of the diaphragm is prevented from being adhered to the gasket, and the diaphragm is prevented from being sucked onto the back electrode plate in the middle during the film sucking process due to the middle suspension design, so that the film sucking of a product can be well avoided under the condition that the total charge amount of the back electrode plate is improved and the charge density of the unit area is improved.
Description
Technical Field
The utility model relates to the technical field of acousto-electric conversion, in particular to a parallel plate capacitor capable of preventing film absorption.
Background
With the development of ECM MIC, the high-sensitivity product is favored in the market due to the advantages of high sensitivity, high signal to noise ratio and the like. Inside the ECM MIC there is a parallel plate capacitor consisting of a back plate, a spacer and a vibrating element (diaphragm), because the back plate is charged, when the diaphragm is subjected to acoustic pressure, the diaphragm vibrates, thus changing the distance between the diaphragm and the plate, i.e. the distance between the two plates of the capacitor, resulting in a change in Δl, which can be deduced from the parallel plate capacitance formulas c=εs/L and u=q/C, and necessarily a change in Δc. The change in deltac necessarily results in a change in deltau, since the total amount of charge on the back-plate is fixed. This initially completes a conversion from acoustic signals (air vibrations) to electrical signals (voltage variations). It can be derived from the above two formulas that, in the case where Δl (air vibration amplitude, representing input) is the same, a larger value of Δu (voltage change, representing output) can be achieved by increasing the amount of charge charged on the back plate, that is, higher sensitivity is obtained.
But the improvement of the electric charge quantity on the back electrode plate causes that the adsorption force of the back electrode plate to the vibration component (vibrating diaphragm) is larger, the vibrating diaphragm is easy to be attached to the back electrode plate during the film suction, the vibrating diaphragm cannot vibrate freely, and then the air vibration of sound cannot be effectively converted into electric signal output, so that a series of problems of low sensitivity, low signal-to-noise ratio, abnormal high-frequency curve and the like are caused.
Disclosure of Invention
The utility model aims to solve the defects in the prior art and provides a parallel plate capacitor for preventing film absorption.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides a prevent parallel plate capacitor of inhaling membrane, includes the back polar plate, the surface mounting of back polar plate has two gaskets, two install the vibrating diaphragm between the gasket, the surface that the back polar plate is close to vibrating diaphragm one side is equipped with prevents inhaling membrane mechanism.
As a further scheme of the utility model, the anti-sucking film mechanism comprises a back plate film, wherein the back plate film is arranged on one side of the back plate, which is close to the vibrating diaphragm, and a film avoiding area is arranged in the central area of the back plate film.
Compared with the prior art, the utility model has the following beneficial effects:
by removing the middle film covering area of the back plate, no electric charge and no adsorption force are generated when no film covering exists in the area where the film is easy to absorb, and the film absorption of the product can be well avoided under the condition that the total amount of electric charge of the back plate is improved and the charge density of the unit area is improved due to the fact that the periphery of the diaphragm is adhered to the gasket and the middle suspension design makes the diaphragm absorb the film.
Drawings
FIG. 1 is a schematic diagram of a parallel plate capacitor for preventing film absorption according to the present utility model;
fig. 2 is a schematic cross-sectional view of a parallel plate capacitor for preventing film absorption according to the present utility model.
In the figure: 1. a back plate; 2. a vibrating diaphragm; 3. a gasket; 4. coating a back electrode plate; 5. and (5) covering the film to avoid the empty area.
Detailed Description
The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 and 2, a parallel plate capacitor capable of preventing film absorption comprises a back plate 1, two gaskets 3 are arranged on the surface of the back plate 1, a vibrating diaphragm 2 is arranged between the two gaskets 3, a film absorption preventing mechanism is arranged on the outer surface of one side, close to the vibrating diaphragm 2, of the back plate 1, the film absorption preventing mechanism comprises a back plate film 4, the back plate film 4 is arranged on one side, close to the vibrating diaphragm 2, of the back plate 1, and a film absorption preventing area 5 is arranged in the central area of the back plate film 4.
In the utility model, the middle film-covering area of the back plate 1 is removed, so that the area easy to absorb the film (no electric charge and no adsorption force are caused when no film is covered) is avoided, the periphery of the diaphragm 2 is prevented from being adhered to the gasket 3, and the middle part of the diaphragm 2 is prevented from being absorbed to the back plate 1 in the film-absorbing process due to the middle suspension design, so that the film absorption of a product can be well avoided under the condition of improving the total electric charge amount (improving the electric charge density per unit area) of the back plate 1. The utility model adopts the back plate 1 to reduce the film covering of partial areas, effectively solves the problem that the ECM MIC high-sensitivity product is difficult to do, does not change other parts, and has simple realization method, mature process, high yield and great market application prospect.
The utility model makes the design more rationalized, the chip collocation can select wider space, and provides a wide design platform for the related products derived in the future. And the structure is simple and easy to manufacture, the cost is low, the process flow is mature, and the yield is high. Different back electrode plates 1 can be flexibly matched aiming at different MIC products, and the product popularization is wide. Material selection: the existing materials of the back electrode plate 1 can be designed.
The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (2)
1. The utility model provides a prevent parallel plate capacitor of inhaling membrane, includes back polar plate (1), its characterized in that, the surface mounting of back polar plate (1) has two gaskets (3), two install vibrating diaphragm (2) between gasket (3), the surface that back polar plate (1) is close to vibrating diaphragm (2) one side is equipped with prevents inhaling membrane mechanism.
2. The parallel plate capacitor capable of preventing film absorption according to claim 1, wherein the film absorption prevention mechanism comprises a back plate film (4), the back plate film (4) is arranged on one side of the back plate (1) close to the vibrating diaphragm (2), and a film covering void area (5) is arranged in the central area of the back plate film (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322305320.5U CN220691876U (en) | 2023-08-28 | 2023-08-28 | Parallel plate capacitor capable of preventing film absorption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322305320.5U CN220691876U (en) | 2023-08-28 | 2023-08-28 | Parallel plate capacitor capable of preventing film absorption |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220691876U true CN220691876U (en) | 2024-03-29 |
Family
ID=90370072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322305320.5U Active CN220691876U (en) | 2023-08-28 | 2023-08-28 | Parallel plate capacitor capable of preventing film absorption |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220691876U (en) |
-
2023
- 2023-08-28 CN CN202322305320.5U patent/CN220691876U/en active Active
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