JP2964355B2 - Helmholtz resonant broadband transducer - Google Patents
Helmholtz resonant broadband transducerInfo
- Publication number
- JP2964355B2 JP2964355B2 JP4036491A JP4036491A JP2964355B2 JP 2964355 B2 JP2964355 B2 JP 2964355B2 JP 4036491 A JP4036491 A JP 4036491A JP 4036491 A JP4036491 A JP 4036491A JP 2964355 B2 JP2964355 B2 JP 2964355B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric element
- cylindrical piezoelectric
- cylindrical
- transducer
- transmission sensitivity
- 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.)
- Expired - Fee Related
Links
- 125000006850 spacer group Chemical group 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 description 16
- 230000035945 sensitivity Effects 0.000 description 15
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Transducers For Ultrasonic Waves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、使用深度に左右されな
い、圧力バランス構造の広帯域送受波器に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband transducer having a pressure balance structure which is not affected by the depth of use.
【０００２】[0002]
【従来の技術】図３は、従来の送受波器の構造を示す側
断面図である。図において、１１は円筒型圧電子、１２
は送受波器を他の構造物（図示せず）に取り付けるため
のフランジ、１３は円筒型圧電子１１をフランジ１２に
固定するための第１のマス、１４は円筒型圧電子１１の
内部に音が入射しないようにするための第２のマス、１
５は円筒型圧電子１１を第１、第２のマス１３、１４に
直に接触させないためのスペーサー、１８は円筒型圧電
子１１の内外部の空洞を充填する絶縁油、１６は円筒型
圧電子１１の内部の絶縁油１８を抜く貫通栓、１７は第
２のマス１４を支える芯中、１９はこの送受波器のケー
スとしてのゴムブーツである。2. Description of the Related Art FIG. 3 is a side sectional view showing the structure of a conventional transducer. In the figure, reference numeral 11 denotes a cylindrical piezoelectric element;
Is a flange for attaching the transducer to another structure (not shown), 13 is a first mass for fixing the cylindrical piezoelectric element 11 to the flange 12, and 14 is inside the cylindrical piezoelectric element 11. A second cell for preventing sound from entering, 1
5 is a spacer for preventing the cylindrical piezoelectric element 11 from coming into direct contact with the first and second masses 13 and 14, 18 is insulating oil filling the inner and outer cavities of the cylindrical piezoelectric element 11, and 16 is a cylindrical piezoelectric element. A penetration plug for removing the insulating oil 18 inside the electronics 11, a core 17 for supporting the second mass 14, and a rubber boot 19 as a case of the transducer.
【０００３】この構造の送受波器は、絶縁油１８によ
り、高水圧であっても円筒型圧電子１１の内外に同等の
圧力が加わり、圧力バランスがなされるため、使用深度
に左右されない。[0003] In the transducer having this structure, the insulating oil 18 applies an equal pressure to the inside and outside of the cylindrical piezoelectric element 11 even at a high water pressure, and the pressure is balanced.
【０００４】送波感度の共振周波数は、円筒型圧電子１
１の径方向の振動の共振周波数によってのみ決まり、送
波感度の周波数特性はこの共振周波数より低い帯域では
１２ｄＢ／ｏｃｔのカーブ特性である。そして最も大き
な送波感度となるのは、共振周波数のところである。図
４には、上記構造の送波感度周波数特性の実測データを
示した。[0004] The resonance frequency of the transmission sensitivity is the cylindrical piezoelectric
1 is determined only by the resonance frequency of the radial vibration, and the frequency characteristic of the transmission sensitivity is a curve characteristic of 12 dB / oct in a band lower than the resonance frequency. The maximum transmission sensitivity is at the resonance frequency. FIG. 4 shows actual measurement data of the transmission sensitivity frequency characteristics of the above structure.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら従来の送
受波器では、径方向の振動の共振周波数よりも充分低い
帯域で、大きな送波感度を実現させることは困難であっ
た。However, it has been difficult for a conventional transducer to realize a large transmission sensitivity in a band sufficiently lower than the resonance frequency of the radial vibration.
【０００６】本発明は、この課題を解決するためにヘル
ムホルツ共振を利用し、径方向の振動の共振周波数より
も下の帯域に大きな送波感度を発生させ、さらに円筒型
圧電子の内部に円柱スペーサを設けることで、そのヘル
ムホルツ共振を調節できるようにすることを目的とす
る。In order to solve this problem, the present invention utilizes Helmholtz resonance to generate a large transmission sensitivity in a band lower than the resonance frequency of the radial vibration, and furthermore, a columnar cylinder inside the cylindrical piezoelectric element. An object of the present invention is to provide a spacer so that Helmholtz resonance can be adjusted.
【０００７】[0007]
【課題を解決するための手段】本発明のヘルムホルツ共
振型広帯域送受波器は、容器内に円筒型圧電子を固定
し、この円筒型圧電子の内外部を絶縁油で充填した圧力
バランス構造の送受波器において、円筒型圧電子の一端
を開放、他端を閉鎖し、さらに円筒型圧電子の内部に所
定の高さの円柱スペーサーを設けたものである。A Helmholtz resonance type broadband transducer according to the present invention has a pressure balance structure in which a cylindrical piezoelectric element is fixed in a container, and the inside and the outside of the cylindrical piezoelectric element are filled with insulating oil. In the transducer, one end of a cylindrical piezoelectric element is opened and the other end is closed, and a cylindrical spacer having a predetermined height is provided inside the cylindrical piezoelectric element.
【０００８】[0008]
【作用】本発明においては、円筒型圧電子が音響管とし
て作用し、ヘルムホルツ共振が発生するので、円筒型圧
電子の径方向の振動の共振以外に、大きな送波感度とな
る帯域が発生する。さらに、円筒型圧電子内部に高さの
異なる円柱スペーサーを設けることにより、そのヘルム
ホルツ共振を調節することができる。In the present invention, since the cylindrical piezoelectric element acts as an acoustic tube and generates Helmholtz resonance, a band having a large transmission sensitivity is generated in addition to the resonance of the radial vibration of the cylindrical piezoelectric element. . Further, by providing cylindrical spacers having different heights inside the cylindrical piezoelectric element, the Helmholtz resonance can be adjusted.
【０００９】[0009]
【実施例】図１は、本発明の一実施例による広帯域送受
波器の構造を示す側断面図である。図において、１は円
筒型圧電子、２は送受波器１を他の構造物（図示せず）
に取り付けるためのフランジ、３は円筒型圧電子１をフ
ランジ２に固定するとともに、円筒型圧電子１の一端を
閉鎖するマス（又はブロック）、４は円筒型圧電子１を
マス３に固定するための音響透過性の良い塩化ビニル、
５は円筒型圧電子１と塩化ビニル４をマス３に固定する
ためのねじ、６は円筒型圧電子１の内外部の空洞を充填
する絶縁油、７は円筒型圧電子１、マス３、及び塩化ビ
ニル４で形成される音響管の内部に設けられた円柱スペ
ーサー、８はこの送受波器のケースとしてのゴムブーツ
である。FIG. 1 is a side sectional view showing the structure of a broadband transducer according to an embodiment of the present invention. In the figure, 1 is a cylindrical piezoelectric element, 2 is a transducer 1 for another structure (not shown)
A flange 3 for fixing the cylindrical piezoelectric element 1 to the flange 2, and a mass (or block) for closing one end of the cylindrical piezoelectric element 1, and a flange 4 for fixing the cylindrical piezoelectric element 1 to the mass 3. PVC with good sound transmission for
5 is a screw for fixing the cylindrical piezoelectric element 1 and the vinyl chloride 4 to the mass 3, 6 is an insulating oil filling the inner and outer cavities of the cylindrical piezoelectric device 1, 7 is a cylindrical piezoelectric device 1, the mass 3 A cylindrical spacer 8 provided inside the acoustic tube formed of vinyl chloride 4 is a rubber boot as a case of the transducer.
【００１０】この送受波器も圧力バランス構造である
が、円筒型圧電子１の一端を開放することで、円筒型圧
電子１を積極的に音響管として機能させるようにしたも
のである。この構造の送受波器は、開放した一端のとこ
ろで腹、閉鎖したマス３のところで節となるような、１
次の振動モードが発生する。この振動モードがいわゆる
ヘルムホルツ共振で、この共振により、円筒型圧電子１
の径方向の振動の共振以外に、大きな送波感度となる帯
域が発生する。図２は、円柱スペーサー７がない場合
の、この実施例による送波感度周波数特性の実測データ
である。これによれば、７ＫＨｚのところにヘルムホル
ツ共振が発生し、大きな送波感度となっている。また、
１５ＫＨｚでは円筒型圧電子１の共振周波数が発生し、
大きな送波感度となっている。図４の従来の送受波器の
実測データと比較すると、７ＫＨｚのところで１５ｄＢ
の送波感度の向上である。This transducer also has a pressure balance structure, but the cylindrical piezoelectric element 1 is made to function as an acoustic tube by opening one end of the cylindrical piezoelectric element 1. The transducer of this structure has a belly at one open end and a node at a closed mass 3.
The next vibration mode occurs. This vibration mode is a so-called Helmholtz resonance.
In addition to the resonance of the vibration in the radial direction, a band having large transmission sensitivity occurs. FIG. 2 shows actually measured data of the transmission sensitivity frequency characteristic according to this embodiment when the cylindrical spacer 7 is not provided. According to this, Helmholtz resonance occurs at a frequency of 7 KHz, resulting in high transmission sensitivity. Also,
At 15 KHz, the resonance frequency of the cylindrical piezoelectric element 1 occurs,
The transmission sensitivity is large. Compared to the measured data of the conventional transducer of FIG. 4, 15 dB at 7 KHz
This is an improvement in transmission sensitivity.
【００１１】一方、円柱スペーサー７は、円筒型圧電子
１を利用した音響管の長さを変える作用を果たすので、
円柱スペーサ−７の高さを変えることにより、このヘル
ムホルツ共振を自由に調節することができ、従ってヘル
ムホルツ共振周波数を使用周波数に応じて自由に設定す
ることができる。なお、円柱スペーサー７を設けた場合
は、それがない場合に比べて音響管の長さを短くするの
で、図２のヘルムホルツ共振は、この実測データに比べ
高いほうにシフトする。On the other hand, since the cylindrical spacer 7 has the function of changing the length of the acoustic tube using the cylindrical piezoelectric element 1,
By changing the height of the column spacer 7, the Helmholtz resonance can be freely adjusted, and thus the Helmholtz resonance frequency can be freely set according to the frequency used. When the cylindrical spacer 7 is provided, the length of the acoustic tube is shortened as compared with the case where it is not provided, so that the Helmholtz resonance in FIG. 2 is shifted to a higher one than the measured data.
【００１２】[0012]
【発明の効果】本発明によれば、円筒型圧電子の一端を
開放し、円筒型圧電子を音響管として機能させたので、
円筒型圧電子の共振に加えて、ヘルムホルツ共振による
送波感度の大きな帯域が２つ発生した。しかも、円筒型
圧電子内部の円柱スペーサーの高さを所定の高さに設定
して、ヘルムホルツ共振周波数を使用周波数に調節する
ことができる効果がある。According to the present invention, one end of the cylindrical piezoelectric element is opened to allow the cylindrical piezoelectric element to function as an acoustic tube.
In addition to the resonance of the cylindrical piezoelectric element, two bands with large transmission sensitivity due to Helmholtz resonance occurred. In addition, there is an effect that the height of the cylindrical spacer inside the cylindrical piezoelectric element is set to a predetermined height, and the Helmholtz resonance frequency can be adjusted to the working frequency.
【図１】本発明の一実施例の構造を示す側断面図であ
る。FIG. 1 is a side sectional view showing the structure of one embodiment of the present invention.
【図２】本発明の送波感度周波数特性図である。FIG. 2 is a transmission sensitivity frequency characteristic diagram of the present invention.
【図３】従来の送受波器の構造を示す側断面図である。FIG. 3 is a side sectional view showing a structure of a conventional transducer.
【図４】従来の送受波器の送波感度周波数特性図であ
る。FIG. 4 is a transmission sensitivity frequency characteristic diagram of a conventional transmitter / receiver.
１ 円筒型圧電子 ３ マス（又はブロック） ６ 絶縁油 ７ 円柱スペーサー ８ ゴムブーツ DESCRIPTION OF SYMBOLS 1 Cylindrical piezoelectric element 3 Mass (or block) 6 Insulating oil 7 Cylindrical spacer 8 Rubber boot
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H04R 17/00 330 H04R 1/44 330 Continuation of front page (58) Field surveyed (Int.Cl. 6 , DB name) H04R 17/00 330 H04R 1/44 330
Claims (1)
筒型圧電子の内外部を絶縁油で充填した圧力バランス構
造の送受波器において、前記円筒型圧電子の一端を開
放、他端を閉鎖し、この円筒型圧電子の内部に所定の高
さの円柱スペーサーを設けたことを特徴とするヘルムホ
ルツ共振型広帯域送受波器。1. A pressure-balanced transducer in which a cylindrical piezoelectric element is fixed in a container and the inside and the outside of the cylindrical piezoelectric element are filled with insulating oil, wherein one end of the cylindrical piezoelectric element is opened. A Helmholtz resonance type broadband transducer having a closed end and a cylindrical spacer having a predetermined height provided inside the cylindrical piezoelectric device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4036491A JP2964355B2 (en) | 1991-03-07 | 1991-03-07 | Helmholtz resonant broadband transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4036491A JP2964355B2 (en) | 1991-03-07 | 1991-03-07 | Helmholtz resonant broadband transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04278798A JPH04278798A (en) | 1992-10-05 |
| JP2964355B2 true JP2964355B2 (en) | 1999-10-18 |
Family
ID=12578587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4036491A Expired - Fee Related JP2964355B2 (en) | 1991-03-07 | 1991-03-07 | Helmholtz resonant broadband transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2964355B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6532292B1 (en) * | 1999-03-03 | 2003-03-11 | Sony Corporation | Method and apparatus to transmit audio into the human ear |
| TW550873B (en) * | 1999-05-17 | 2003-09-01 | Nec Tokin Corp | Electrodynamic type of vibration actuator and mobile communication terminal |
| JP6478637B2 (en) * | 2015-01-06 | 2019-03-06 | 大成建設株式会社 | Ultrasonic probe |
-
1991
- 1991-03-07 JP JP4036491A patent/JP2964355B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04278798A (en) | 1992-10-05 |
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