JPH01238296A - Oscillating noise suppressing type flat receiver - Google Patents
Oscillating noise suppressing type flat receiverInfo
- Publication number
- JPH01238296A JPH01238296A JP6521788A JP6521788A JPH01238296A JP H01238296 A JPH01238296 A JP H01238296A JP 6521788 A JP6521788 A JP 6521788A JP 6521788 A JP6521788 A JP 6521788A JP H01238296 A JPH01238296 A JP H01238296A
- Authority
- JP
- Japan
- Prior art keywords
- receiver
- rigid plate
- film
- plate
- noise suppressing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010409 thin film Substances 0.000 claims abstract description 10
- 239000010408 film Substances 0.000 abstract description 19
- 239000002033 PVDF binder Substances 0.000 abstract description 16
- 229920002981 polyvinylidene fluoride Polymers 0.000 abstract description 16
- 238000005452 bending Methods 0.000 abstract description 13
- 230000035945 sensitivity Effects 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 8
- 230000010355 oscillation Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 239000012778 molding material Substances 0.000 description 4
- 239000000725 suspension Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 101150067539 AMBP gene Proteins 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は高分子圧電材であるポリフッ化ビニリデン（以
下’ＰＶＤＦＪという）等からなる薄膜受波素子を用い
た大表面積をもつ振動雑音抑制型平面受波器に関するも
のである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a vibration noise suppressing type with a large surface area using a thin film receiving element made of polyvinylidene fluoride (hereinafter referred to as PVDFJ), which is a polymeric piezoelectric material. It is related to a planar receiver.
高分子圧電材であるＰＶＤＦ等の薄膜受波素子を用いた
受波器としては、従来第２図に示す構造のものがある。A conventional wave receiver using a thin film wave receiving element such as PVDF, which is a piezoelectric polymer material, has a structure shown in FIG.
同図において、１はＰＶＤＦフィルムであ’）、該ＰＶ
ＤＦフィルム１はモールド材３で覆われている。なお、
２はケーブルである。In the figure, 1 is a PVDF film), and the PVDF film is
DF film 1 is covered with molding material 3. In addition,
2 is a cable.
上記構造の受波器はＰＶＤＦフィルム１の体積効果によ
り、体積圧電定数ｇｌＩＸフィルム厚さの受波感度を持
つものであ゛る。ＰＶＤＦフィルム１は従来の圧電セラ
ミックを使用した受波器に比較し、容易に大表面積のも
のが製造でき、体積圧電定数が高く低周波用受波器とし
て有効である。Due to the volume effect of the PVDF film 1, the receiver having the above structure has a receiving sensitivity equal to the volume piezoelectric constant glIX film thickness. Compared to conventional wave receivers using piezoelectric ceramics, the PVDF film 1 can be easily produced with a large surface area, has a high volume piezoelectric constant, and is effective as a low frequency wave receiver.
しかしながら、上記構成の受波器では、大表面のもので
はモールド材３を含む受波器全体の硬きが低いために微
少な駆動力においても容易に屈曲振動が発生し、その屈
曲振動に対する雑音出力を発生し、例えば、海中吊下、
艦船装備等の分野においては実用に耐えるものではなか
った。However, in the receiver with the above configuration, if the receiver has a large surface, the hardness of the entire receiver including the molding material 3 is low, so bending vibration easily occurs even with a minute driving force, and noise due to the bending vibration is generated. generates output, e.g. suspended underwater,
It was not practical in the field of ship equipment.
本発明は上述の点に鑑みてなされたもので、薄膜受波素
子を用いた受波器の屈曲雑音出力を抑制し、海中吊下及
び艦船装備等で実用に耐え得る低雑音の受波器を提供す
ることを目的とする。The present invention has been made in view of the above-mentioned points, and is a low-noise receiver that suppresses the bending noise output of a receiver using a thin film receiving element, and can withstand practical applications such as underwater suspension and ship equipment. The purpose is to provide
上記課題を解決する本発明は、第１図に示すようにＰＶ
ＤＦフィルム１からなる薄膜受波素子を具備する平面型
受波器において、ＰＶＤＦフィルム１の背面に剛板４を
取り付けたことを特徴とする。The present invention solves the above problems, as shown in FIG.
A flat wave receiver equipped with a thin film wave receiving element made of a DF film 1 is characterized in that a rigid plate 4 is attached to the back surface of the PVDF film 1.
また、剛板４に複数のスリット４ａを設けたことを特徴
とする。Further, it is characterized in that the rigid plate 4 is provided with a plurality of slits 4a.
上記の如＜ＰＶＤＦフィルム１の背面に剛板４を取り付
けることにより、受波器の剛性が向上し、屈曲振動によ
る雑音出力を低減することができるから海中吊下、艦船
装備等の分野において実用に耐えるものとなる。As mentioned above, by attaching the rigid plate 4 to the back of the PVDF film 1, the rigidity of the receiver can be improved and the noise output due to bending vibration can be reduced, so it is practical in the fields of underwater suspension, ship equipment, etc. It will withstand.
また、剛板４にスリット４ａを設けると、剛板の屈曲振
動数が高周波領域に移行するため、より使用周波数帯域
巾の広い受波器を実現することができる。Further, when the slits 4a are provided in the rigid plate 4, the bending frequency of the rigid plate shifts to a high frequency region, so that a wave receiver with a wider usable frequency band can be realized.
以下、本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
第１図は本発明に係る振動雑音抑制型平面受波器の構造
を示す図である。同図において、１はＰＶＤＦフィルム
であり、該ＰＶＤＦフィルム１の背面には剛板４が接着
されており、このＰＶＤＦフィルム１及び剛板４をモー
ルド材３で覆っている。なお、２はケーブルである。FIG. 1 is a diagram showing the structure of a vibration noise suppressing planar receiver according to the present invention. In the figure, 1 is a PVDF film, a rigid plate 4 is adhered to the back surface of the PVDF film 1, and the PVDF film 1 and the rigid plate 4 are covered with a molding material 3. Note that 2 is a cable.
剛板４はなるべく剛性の高いもので肉厚の厚い金属材が
好ましいが、使用周波数条件によっては、音響透過性の
よい、例えば強化繊維プラスチック（ＦＲＰ）、塩化ビ
＝−ル（ＰＶＣ）等の樹脂材でもよい。The rigid plate 4 is preferably made of a metal material with high rigidity and thick wall thickness, but depending on the operating frequency conditions, it may be made of a material with good acoustic transparency, such as reinforced fiber plastic (FRP) or polyvinyl chloride (PVC). A resin material may also be used.
剛板４にモードが発生し屈曲振動を起こし、共振現象を
発生し、平坦な受波感度周波数特性を乱す場合には、第
３図に示すように剛板４のスリンｔ−４ａを設けること
により受波器自体の振動領域を高周波領域に移行させ、
この共振現象を除去して、より使用周波数帯域巾の広い
受波器を実現することも可能となる。If a mode occurs in the rigid plate 4, causing bending vibration and resonance, which disturbs the flat receiving sensitivity frequency characteristics, install a slint t-4a on the rigid plate 4 as shown in Fig. 3. The vibration region of the receiver itself is shifted to the high frequency region,
By eliminating this resonance phenomenon, it is also possible to realize a receiver with a wider usable frequency bandwidth.
第１図及び第３図に示す受波器において、いずれもＰＶ
ＤＦフィルム１の背面に剛板４を接着するための接着剤
としては、モールド材３と同質材料（本実施例ではポリ
ウレタン）のものを用いるとよい。In the receivers shown in Figures 1 and 3, both PV
As the adhesive for bonding the rigid plate 4 to the back surface of the DF film 1, it is preferable to use an adhesive made of the same material as the molding material 3 (polyurethane in this embodiment).
また、第１図に示す構成例では、剛板４としては厚さ１
ｃＴｒｌ、巾１５７ｍｍ、長さ３７３ＩＴＩｌ′ＩＩの
銅板を使用し、ＰＶＤＦフィルム１その厚さ１１０μ、
モールド材３の外径寸法は巾１５０ａＸ長さ２５Ｑ１１
１ｍＸ厚さ１６ｍ１ｌｌとした。、第４図（ａ）は従来
（第２図に示す構造）の受波器の受波感度（相対値）周
波数特性を示し、第４（ｂ）は上記本実施例（第１図に
示す構造）の受波器の受波感度（相対値）周波数特性を
示す図である。第４図においては、横軸は対数スケール
の周波数を示し、縦軸は受波感度（相対値）を示してい
る。同図（ｂ）に示すように本実施例の場合は受波感度
（相対値）は１ｋＨｚ近傍まで安定している。これに対
して同図（ａ）では低周波領域（１ｋＨｚ以下）でも受
波感度（相対値）は乱れる。これは従来例の場合、屈曲
雑音出力により、Ｓ／Ｎ比が低下したためと推定される
。In addition, in the configuration example shown in FIG. 1, the rigid plate 4 has a thickness of 1
cTrl, using a copper plate with a width of 157 mm and a length of 373 ITIl'II, and a PVDF film 1 with a thickness of 110 μ,
The outer diameter dimensions of mold material 3 are width 150a x length 25Q11
It was set to 1m×16ml in thickness. , FIG. 4(a) shows the receiving sensitivity (relative value) frequency characteristics of the conventional receiver (structure shown in FIG. 2), and FIG. FIG. 2 is a diagram showing the receiving sensitivity (relative value) frequency characteristics of a receiver with a structure). In FIG. 4, the horizontal axis shows frequency on a logarithmic scale, and the vertical axis shows reception sensitivity (relative value). As shown in FIG. 4B, in this embodiment, the receiving sensitivity (relative value) is stable up to around 1 kHz. On the other hand, in FIG. 6A, the receiving sensitivity (relative value) is disturbed even in the low frequency region (1 kHz or less). This is presumed to be because, in the case of the conventional example, the S/N ratio decreased due to the bending noise output.
上記のように本実施例によれば、ＰＶＤＦフィルム１の
背面に剛板４を接着することにより、受波感度（相対値
）が１ｋＨｚ近傍まで極めて安定した、受波器が得られ
る。As described above, according to this embodiment, by bonding the rigid plate 4 to the back surface of the PVDF film 1, a wave receiver with extremely stable wave receiving sensitivity (relative value) up to around 1 kHz can be obtained.
なお、上記実施画では、薄膜受波素子としてＰＶＤＦフ
ィルム１を用いたが、他の高分子圧電材料等からなる薄
膜受波素子でもよいことは当然である。Although the PVDF film 1 is used as the thin-film wave receiving element in the above-mentioned embodiment, it goes without saying that a thin-film wave receiving element made of other polymeric piezoelectric materials or the like may also be used.
以上説明したように本発明によれば、下記のような優れ
た効果が得られる。As explained above, according to the present invention, the following excellent effects can be obtained.
■薄膜受波素子の背面に剛板を取り付けることにより、
受波器の剛性が向上し、屈曲振動による雑音出力を低減
することができから海中吊下、艦船装備等の分野におい
て実用に耐える平面受波器になる。■By attaching a rigid plate to the back of the thin film receiving element,
The rigidity of the receiver is improved and the noise output due to bending vibration can be reduced, making it a planar receiver that can be used in practical applications such as underwater suspension and ship equipment.
■また、剛仮にスリットを設けると、受波器自体の屈曲
振動数が高周波領域に移行するため、剛仮にモードが発
生し屈曲振動による共振現象を除去できるから、より使
用周波数帯域１１の広い平面受波器となる。■In addition, if a slit is provided in the rigid frame, the bending frequency of the receiver itself shifts to a high frequency region, so a mode is generated in the rigid frame and the resonance phenomenon caused by bending vibration can be eliminated, making it possible to eliminate the resonance phenomenon caused by the bending vibration. It becomes a receiver.
第１図は本発明に係る振動雑音抑制型平面受波器の構造
を示す図、第２図は従来の平面受波器の構造を示す図、
第３図は本発明に係る他の振動雑音抑制型平面受波器の
構造を示す図、第４図（ａ）は従来の受波器の受波感度
（相対値）周波数特性を示す図、同図（ｂ）は本実施例
の受波器の受波感度（相対値）周波数特性を示す図であ
る。
図中、１・・・・ＰＶＤＦフィルム、２・・・・ケーブ
ル、３・・・・モールド材、４・・・・剛板。FIG. 1 is a diagram showing the structure of a vibration noise suppressing planar receiver according to the present invention, FIG. 2 is a diagram showing the structure of a conventional planar receiver,
FIG. 3 is a diagram showing the structure of another vibration noise suppressing planar receiver according to the present invention, FIG. 4(a) is a diagram showing the receiving sensitivity (relative value) frequency characteristics of the conventional receiver, FIG. 5B is a diagram showing the receiving sensitivity (relative value) frequency characteristics of the receiver of this embodiment. In the figure, 1: PVDF film, 2: cable, 3: mold material, 4: rigid plate.
Claims (2)
薄膜受波素子の背面に剛板を取り付けたことを特徴とす
る振動雑音抑制型平面受波器。(1) In a planar receiver equipped with a thin film receiver element,
A vibration noise suppressing flat wave receiver characterized by a rigid plate attached to the back of a thin film wave receiving element.
する請求項（１）記載の振動雑音制御型平面受波器。(2) The vibration noise control type planar receiver according to claim (1), characterized in that a plurality of slits are provided in the rigid plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6521788A JPH01238296A (en) | 1988-03-17 | 1988-03-17 | Oscillating noise suppressing type flat receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6521788A JPH01238296A (en) | 1988-03-17 | 1988-03-17 | Oscillating noise suppressing type flat receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01238296A true JPH01238296A (en) | 1989-09-22 |
Family
ID=13280525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6521788A Pending JPH01238296A (en) | 1988-03-17 | 1988-03-17 | Oscillating noise suppressing type flat receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01238296A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03114399A (en) * | 1989-09-28 | 1991-05-15 | Nec Corp | Acoustoelectric converter |
| JP2015055585A (en) * | 2013-09-13 | 2015-03-23 | 積水化学工業株式会社 | Piezoelectric type vibration sensor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60139100A (en) * | 1983-12-02 | 1985-07-23 | レイセオン カンパニ− | Transducer |
| JPS62183299A (en) * | 1986-02-06 | 1987-08-11 | Kureha Chem Ind Co Ltd | Piezoelectric element and vibration sensor |
-
1988
- 1988-03-17 JP JP6521788A patent/JPH01238296A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60139100A (en) * | 1983-12-02 | 1985-07-23 | レイセオン カンパニ− | Transducer |
| JPS62183299A (en) * | 1986-02-06 | 1987-08-11 | Kureha Chem Ind Co Ltd | Piezoelectric element and vibration sensor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03114399A (en) * | 1989-09-28 | 1991-05-15 | Nec Corp | Acoustoelectric converter |
| JP2015055585A (en) * | 2013-09-13 | 2015-03-23 | 積水化学工業株式会社 | Piezoelectric type vibration sensor |
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