JPS6199497A - Piezoelectric oscillator - Google Patents
Piezoelectric oscillatorInfo
- Publication number
- JPS6199497A JPS6199497A JP22083684A JP22083684A JPS6199497A JP S6199497 A JPS6199497 A JP S6199497A JP 22083684 A JP22083684 A JP 22083684A JP 22083684 A JP22083684 A JP 22083684A JP S6199497 A JPS6199497 A JP S6199497A
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- oscillation mode
- piezoelectric ceramic
- holes
- acoustic
- 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.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 16
- 230000001788 irregular Effects 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000010355 oscillation Effects 0.000 abstract 5
- 230000005855 radiation Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 229910052573 porcelain Inorganic materials 0.000 description 4
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
- B06B1/0651—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element of circular shape
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
；ｔ ｌ’；て明は、情群探知機、音°、叩測深機、ざ
響探信機、地下埋設物探索機、超音波探傷機、超音波診
断装置などパルス状超音波の送受波を目的とする超音波
送受波振動子またはランジュバン振動子等に使用される
圧電振動子に関する。[Detailed description of the invention] Industrial fields of application; tl'; technology includes information group detectors, sound angles, depth sounders, sound detectors, underground buried object searchers, ultrasonic flaw detectors, The present invention relates to a piezoelectric vibrator used in an ultrasonic wave transmitting/receiving vibrator or Langevin vibrator for the purpose of transmitting and receiving pulsed ultrasonic waves such as in an ultrasonic diagnostic device.
従来技術
従来のこの神の圧電振動子は、一般に、第７図にポすよ
うに、チタン酸バリウム系磁器あるいはＰＺＴ系圧電圧
電磁器より、円板状または角扱状゛）の１・板状に形成
された圧゛１Ｌ磁器、Ｌ体ｌの厚みあるいは縦方向の両
面に′電極２．３を形成した構造となっていた。圧電磁
器素体１の分極方向Ｐは、通常は、’１ｌｉ２．３によ
る電界方向と一致する方向、即ち厚みあるいは縦方向と
なり、厚みあるいは縦方向の振動モートを利用する構成
となっていた。PRIOR ART Conventional piezoelectric vibrators are generally made of barium titanate-based porcelain or PZT-based piezovoltaic electromagnetic ceramics, as shown in FIG. It had a structure in which electrodes 2.3 were formed on both sides in the thickness or longitudinal direction of the L-shaped 1L porcelain body. The polarization direction P of the piezoelectric ceramic body 1 is usually the same direction as the electric field direction due to '1li2.3, that is, the thickness or longitudinal direction, and the configuration utilizes a vibration moat in the thickness or longitudinal direction.
従来技術の欠点
しかしながら、第７図に示した従来の圧電振動子におい
ては、本来利用する厚み縦振動モートの外に、径振動モ
ード、横振動モード及びその高調波振動モードが大きく
、これによるスプリアスが問題となっていた。Disadvantages of the Prior Art However, in the conventional piezoelectric vibrator shown in Fig. 7, in addition to the originally utilized thickness longitudinal vibration mode, the radial vibration mode, the transverse vibration mode, and their harmonic vibration modes are large, and spurious was a problem.
本発明の目的 本発明は上述する従来からの問題点を解決し。Purpose of the invention The present invention solves the above-mentioned conventional problems.
径振動モード、横振動モード及びその高調波振動モード
を小さくして、スプリアス成分を低減させた圧電振動子
を提供することを目的とする。It is an object of the present invention to provide a piezoelectric vibrator in which spurious components are reduced by reducing radial vibration mode, lateral vibration mode, and harmonic vibration mode thereof.
本発明の構成
上記目的を達成するため、本発明に係る圧電振幼子は、
圧、し磁器＋９体の外周縁に昌ｉ庁的１ｉｊ失の人きい
負荷媒質を被ノ１させたことを特徴とする。Structure of the present invention In order to achieve the above object, a piezoelectric vibrator according to the present invention has the following features:
It is characterized by the fact that the outer periphery of the porcelain body is coated with a transparent load medium, which is similar to that used in modern times.
実施例
第１１Ａは本二・を明に係る圧’＋ｈ ｍ動子の平面図
第２図は回じくその正面断面又である０図において、
第３図と同一の８Ｅ■符号は同一性ある構成部分を示し
ている。この実施例では、円板または角根状等の適当な
平板状に形成された圧電磁器素体ｌの厚み方向に、電極
２，３を被着形成すると共に、この圧電磁器素体ｌの外
周縁＋０１の全周に、Ｆｇ ？？的損失の大きい負荷媒
質４を被着させである。このような負荷媒質４としては
、フェライト混入ゴム、金属粉末混入エポキシ樹脂等が
適当である。Embodiment No. 11A is a plan view of the pressure '+h m mover according to the present invention.
The same reference numerals 8E■ as in FIG. 3 indicate identical components. In this embodiment, electrodes 2 and 3 are formed in the thickness direction of a piezoelectric ceramic body l formed into a suitable flat plate shape such as a disk or a square root shape, and the electrodes 2 and 3 are formed on the outside of this piezoelectric ceramic body l. Fg on the entire circumference of the periphery +01? ? In this case, a load medium 4 with a large physical loss is deposited. As such a load medium 4, rubber mixed with ferrite, epoxy resin mixed with metal powder, etc. are suitable.
上述のように、圧電磁器素体ｌの外周縁に音響的損失の
大きい負荷媒質４を被着させると、径振動モードもしく
は横振動モートまたはその共振作用が、この負荷媒質４
によって吸収され、スプリアスが低減される。As described above, when the load medium 4 with a large acoustic loss is attached to the outer peripheral edge of the piezoelectric ceramic element l, the radial vibration mode or the transverse vibration mote or its resonance effect is caused by the load medium 4.
, and the spurious signals are reduced.
第３図は本発明に係る圧電振動子の別の実施例における
平面図、第４図は第３図Ａ、−Ａｉ線上−二おける断面
図である。この実施例では、圧電磁器も休ｌの外周縁に
音響的損失の大きい負荷媒質４を被着させると共に、圧
電磁器素体の厚み方向に、多数の貫通孔状の空孔５を形
成しである。この実施例では空孔５は１円形状となって
いるが、例えば四角形状或いは六角状等の角形状に形成
してもよい。3 is a plan view of another embodiment of the piezoelectric vibrator according to the present invention, and FIG. 4 is a sectional view taken along the line -Ai in FIG. 3A. In this embodiment, the piezoelectric ceramic is also coated with a load medium 4 having a large acoustic loss on the outer periphery of the hole, and a large number of holes 5 in the form of through holes are formed in the thickness direction of the piezoelectric ceramic body. be. Although the holes 5 have a circular shape in this embodiment, they may be formed into a rectangular shape such as a square shape or a hexagonal shape.
１鑓のような空孔５を設けると、当該圧電振動子に対し
て、誘１［率を下げずに、異方性に類似した特性を持た
せることができるので、前述の音響的損失の大きい負荷
媒質４の作用と相まって、径凧動モートまたは横振動モ
ードを更に小さくして、スプリアス成分を低減させるこ
とができる。By providing the hole 5 like a chisel, it is possible to give the piezoelectric vibrator characteristics similar to anisotropy without lowering the dielectric constant, thereby reducing the acoustic loss mentioned above. Coupled with the effect of the large load medium 4, the radial kite moat or transverse vibration mode can be further reduced, and spurious components can be reduced.
前記空孔５は、その口形が円形状である場合には、その
直径文が圧電振動子としての固有共振周波数ｆＯの波長
入より小さくなるように選定し。When the hole 5 has a circular mouth shape, the hole 5 is selected so that its diameter is smaller than the wavelength of the natural resonant frequency fO of the piezoelectric vibrator.
角形状に形成した場合には、対角線長文を最大口（イと
し、文く入となるように選定する。If it is formed into a rectangular shape, the diagonal line is selected so that it has the largest opening (I) and the longest sentence.
上６のように、空孔５を、その１１ン大ロイ文が共振周
波数ｆｏによる音場媒質中の音波の波長入より小さくな
るように形成すると、８響負荷が見１１）け上大きくな
り水中へＩＬＩＩ￥ｒ波を放射するに当ってパルス駆動
すると、水中での機械的品質係数Ｑｍが従来の圧電振動
子より小さくなり、ａ音波パルス幅が短くなって、距Ｊ
分解能が向上する。As shown in 6 above, if the hole 5 is formed so that its 11-n diameter is smaller than the wavelength of the sound wave in the sound field medium due to the resonant frequency fo, the acoustic load will increase by 11). When pulse driving is used to radiate ILII\r waves into water, the mechanical quality factor Qm in water becomes smaller than that of conventional piezoelectric vibrators, the a sound wave pulse width becomes shorter, and the distance J
Resolution is improved.
：５５図は本発明に係る圧電振動子の更に別の実施例に
おける平面図、第６図は第５図Ａ２ −Ａ２線Ｅにおけ
る断面図である。この実施例の特徴は、圧電磁器素体ｌ
の外周縁１０１を不規則な凹凸縁とし、この不規則な外
周縁１０１にｎ ｑＱ的損失の大きい物質４を被着させ
たことである。圧１に磁器素体ｌの外周縁＋０１を規則
性のない不規則縁シニすると、異方性に類似した振動特
性を持つようになり ｆｒ、ｑ的損失の大きい負荷媒質
４及び空孔５による作用と相まって、横振動モートが更
に効果的に抑制され、スプリアスか一層低減される。55 is a plan view of yet another embodiment of the piezoelectric vibrator according to the present invention, and FIG. 6 is a sectional view taken along line A2-A2 in FIG. The feature of this embodiment is that the piezoelectric ceramic element l
The outer peripheral edge 101 of the outer peripheral edge 101 is an irregularly uneven edge, and a material 4 having a large nqQ loss is coated on this irregular outer peripheral edge 101. When the outer peripheral edge +01 of the porcelain body l is set to a pressure 1 with an irregular edge without regularity, it will have vibration characteristics similar to anisotropy, due to the load medium 4 and holes 5 with large fr and q losses. Coupled with this effect, the lateral vibration moat is more effectively suppressed, and spurious noise is further reduced.
未発１．１１の効果
以上述へたように、本発明に係る圧電振動子は、ｆＥ・
しｒｅ器器体体外周縁にｆｒ ｔｉｌｌ的損失の大きい
負７４奴賀を被りさせたことを４’）徴とするから径振
動モート、横振動モート、及びそのん°１調波振動モー
トを小さくして、スプリアス成分を低減させたｊＪ８屯
振動子を提供することかできる。Effects of Unexploded 1.11 As mentioned above, the piezoelectric vibrator according to the present invention has fE・
The 4') characteristic is that the outer periphery of the instrument body is subjected to a negative 74 nega with large fr till loss, so the radial vibration moat, lateral vibration moat, and the degree 1 harmonic vibration mote are reduced. In this way, it is possible to provide a jJ8tun oscillator with reduced spurious components.
第１図は本発明に係る圧電振動子の平面図、第２［４は
回しくその正面断面図、第３図は本発明に係る圧電振動
子の別の実施例における平面図、第４１くは第３図Ａ、
−Ａ、線とにおける断面図、第５図は本発明に係る圧電
振動子の更に別の実施例における平面図、第６図は第５
図Ａ２−Ａ２ 線上における断面図、第７図は従来の圧
電振動子の斜視図である。
ｌ・・・圧電磁器素体 ２．３・・・電極４・・
・音？１的損失の大きな負荷媒質５・・・空孔
１０１ ・・・外周縁特許出願人 奥
山 大 太 部ティーディーケイ株式会社
１−一−〜゛］
代Ｊ’ｌ！人 ；ＰＪ’Ｌｔ： ７４ ８Ｒ”
ｚ ａ（、Ｈ叱−１−」
第１図
第２図
第３図
第５図
第７０FIG. 1 is a plan view of a piezoelectric vibrator according to the present invention, FIG. 2 is a front sectional view thereof, and FIG. is Figure 3A,
5 is a plan view of yet another embodiment of the piezoelectric vibrator according to the present invention, and FIG.
A sectional view taken along line A2-A2 and FIG. 7 are perspective views of a conventional piezoelectric vibrator. l... Piezoelectric ceramic body 2.3... Electrode 4...
·sound? Loading medium with large single loss 5...Vacancies
101 ... Outer edge patent applicant Oku
Yama Daitabe TDC Co., Ltd. 1-1-~゛] Dai J'l! Person; PJ'Lt: 74 8R"
z a(,H scold-1-" Figure 1 Figure 2 Figure 3 Figure 5 Figure 70
Claims (7)
媒質を被着させたことを特徴とする圧電振動子。(1) A piezoelectric vibrator characterized in that a load medium with a large acoustic loss is coated on the outer periphery of a piezoelectric ceramic body.
混入ゴム、金属粉末混入エポキシ樹脂等であることを特
徴とする特許請求の範囲第１項に記載の圧電振動子。(2) The piezoelectric vibrator according to claim 1, wherein the load medium having a large acoustic loss is ferrite-containing rubber, metal powder-containing epoxy resin, or the like.
ていることを特徴とする特許請求の範囲第１項または第
２項に記載の圧電振動子。(3) The piezoelectric vibrator according to claim 1 or 2, wherein the outer periphery of the piezoelectric ceramic body has an irregular shape.
向に多数の空孔を有することを特徴とする特許請求の範
囲第１項、第２項または第３項に記載の圧電振動子。(4) The piezoelectric vibrator according to claim 1, 2, or 3, wherein the piezoelectric ceramic body has a large number of holes in its thickness direction or in its longitudinal direction.
は縦方向に貫通させたことを特徴とする特許請求の範囲
第４項に記載の圧電振動子。(5) The piezoelectric vibrator according to claim 4, wherein the holes penetrate the piezoelectric ceramic body in a thickness direction or a longitudinal direction.
場媒質中の音波の波長より小さくなるように形成したこ
とを特徴とする特許請求の範囲第４項または第５項に記
載の圧電振動子。(6) The piezoelectric element according to claim 4 or 5, wherein the hole is formed so that its maximum diameter is smaller than the wavelength of the sound wave in the sound field medium due to the resonance frequency. vibrator.
電極を有することを特徴とする特許請求の範囲第１項、
第２項、第３項、第４項、第５項または第６項に記載の
圧電振動子。(7) Claim 1, characterized in that the piezoelectric element has electrodes on both sides in the thickness direction or the longitudinal direction;
The piezoelectric vibrator according to item 2, 3, 4, 5, or 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22083684A JPS6199497A (en) | 1984-10-20 | 1984-10-20 | Piezoelectric oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22083684A JPS6199497A (en) | 1984-10-20 | 1984-10-20 | Piezoelectric oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6199497A true JPS6199497A (en) | 1986-05-17 |
| JPH0462517B2 JPH0462517B2 (en) | 1992-10-06 |
Family
ID=16757301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22083684A Granted JPS6199497A (en) | 1984-10-20 | 1984-10-20 | Piezoelectric oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6199497A (en) |
-
1984
- 1984-10-20 JP JP22083684A patent/JPS6199497A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0462517B2 (en) | 1992-10-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3852949B2 (en) | Ultrasonic transducer | |
| US6772490B2 (en) | Method of forming a resonance transducer | |
| US6225728B1 (en) | Composite piezoelectric transducer arrays with improved acoustical and electrical impedance | |
| US6643222B2 (en) | Wave flextensional shell configuration | |
| US20030051323A1 (en) | Composite piezoelectric transducer arrays with improved acoustical and electrical impedance | |
| JPH0730998A (en) | Ultrasonic probe | |
| GB2098828A (en) | Ultrasonic transducer for single frequency applications | |
| JPS618033A (en) | Ultrasonic converter system | |
| JPS6199497A (en) | Piezoelectric oscillator | |
| US3443131A (en) | Broadband exciter for electroacoustic and magnetoacoustic transducers | |
| AU532596B2 (en) | Improving the coupling and directivity of electroacoustic transducers | |
| JPH03224400A (en) | Piezoelectric ultrasonic vibrator | |
| JPS61101199A (en) | Honeycomb-like vibrator | |
| O'Brien Jr | Single-element transducers. | |
| JPS60138457A (en) | Separate transmitter and receiver ultrasonic probe | |
| JPH0462516B2 (en) | ||
| JPS62261300A (en) | Compound piezoelectric material for ultrasonic probe | |
| JPH01189578A (en) | Underwater ultrasonic vibrator | |
| JPS60247159A (en) | Ultrasonic probe | |
| JPS61101197A (en) | Honeycomb piezoelectric vibrator | |
| JPS586461A (en) | Ultrasonic probe | |
| JPS62232299A (en) | Piezoelectric oscillator | |
| JPH0241999Y2 (en) | ||
| RU98106196A (en) | ULTRASONIC TRANSMITTER | |
| JPH07274279A (en) | Ultrasonic hydrophone |