JPH0462517B2 - - Google Patents
Info
- Publication number
- JPH0462517B2 JPH0462517B2 JP22083684A JP22083684A JPH0462517B2 JP H0462517 B2 JPH0462517 B2 JP H0462517B2 JP 22083684 A JP22083684 A JP 22083684A JP 22083684 A JP22083684 A JP 22083684A JP H0462517 B2 JPH0462517 B2 JP H0462517B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric vibrator
- piezoelectric
- ceramic body
- vibrator according
- piezoelectric ceramic
- 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
Links
- 239000000919 ceramic Substances 0.000 claims description 18
- 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
- 230000000694 effects Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 241000251468 Actinopterygii Species 0.000 description 1
- 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
- 230000010287 polarization Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、魚群探知機、音響測探機、音響探信
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ユバン振動子等
に使用される圧電振動子に関する。[Detailed Description of the Invention] Industrial Application Field The present invention is applicable to pulsed ultrasonic devices such as fish finders, acoustic sounding devices, acoustic detectors, underground buried object search devices, ultrasonic flaw detectors, and ultrasonic diagnostic devices. The present invention relates to a piezoelectric vibrator used in an ultrasonic wave transmitting/receiving vibrator or a Languevent vibrator for the purpose of transmitting and receiving waves.
従来技術
従来のこの種の圧電振動子は、一般に、第７図
に示すように、チタン酸バリウム系磁器あるいは
PZT系圧電磁器等により、円板状または角板状
等の平板状に形成された圧電磁器素体１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
となつていた。圧電磁器素体１の分極方向Ｐは、
通常は、電極２，３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ドを利用する構成となつてい
た。Prior Art Conventional piezoelectric vibrators of this type are generally made of barium titanate-based porcelain or
It has a structure in which electrodes 2 and 3 are formed on both sides of the piezoelectric ceramic body 1 in the thickness or longitudinal direction of a piezoelectric ceramic body 1 formed of a PZT-based piezoelectric ceramic or the like in a flat plate shape such as a disk shape or a square plate shape. The polarization direction P of the piezoelectric ceramic body 1 is
Usually, the direction is the same as the direction of the electric field from the electrodes 2 and 3, that is, the thickness or longitudinal direction, and the vibration mode in the thickness or longitudinal direction is utilized.
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ドの
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
問題となつていた。Disadvantages of the Prior Art However, in the conventional piezoelectric vibrator shown in Fig. 7, in addition to the originally used thickness longitudinal vibration mode, the radial vibration mode, the transverse vibration mode, and their harmonic vibration modes are large, and spurious was becoming 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、
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。Purpose of the present invention The present invention solves the above-mentioned conventional problems,
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
動子は、圧電磁器素体の外周縁に音響的損失の大
きい負荷媒質を被着させたことを特徴とする。Configuration of the Present Invention In order to achieve the above object, a piezoelectric vibrator according to the present invention is characterized in that a load medium with a large acoustic loss is coated on the outer periphery of a piezoelectric ceramic body.
実施例
第１図は本発明に係る圧電振動子の平面図、第
２図は同じくその正面断面図である。図におい
て、第３図と同一の参照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
板状等の適当な平板状に形成された圧電磁器素体
１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１の外周縁１０１の全周
に、音響的損失の大きい負荷媒質４を被着させて
ある。このような負荷媒質４としては、フエライ
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 FIG. 1 is a plan view of a piezoelectric vibrator according to the present invention, and FIG. 2 is a front sectional view thereof. In the figure, the same reference numerals as in FIG. 3 indicate the same components. In this embodiment, electrodes 2 and 3 are formed in the thickness direction of a piezoelectric ceramic body 1 formed into a suitable flat plate shape such as a disk or a square plate shape, and the electrodes 2 and 3 are formed on the outside of the piezoelectric ceramic body 1. A load medium 4 with a large acoustic loss is applied over the entire circumference of the peripheral edge 101. 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１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ドまたはその共振作
用が、この負荷媒質４によつて吸収され、スプリ
アスが低減される。 As described above, when the load medium 4 with large acoustic loss is applied to the outer periphery of the piezoelectric ceramic body 1, the radial vibration mode, the transverse vibration mode, or their resonance effects are absorbed by the load medium 4. , 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A1−A1線上に
おける断面図である。この実施例では、圧電磁器
素体１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を形成してある。こ
の実施例では空孔５は、円形状となつているが、
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。 FIG. 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 line A1 - A1 in FIG. In this embodiment, a load medium 4 with large acoustic loss is placed on the outer periphery of the piezoelectric ceramic body 1.
At the same time, a large number of holes 5 in the form of through holes are formed in the thickness direction of the piezoelectric ceramic body. In this example, the holes 5 are circular, but
For example, it may be formed into a rectangular shape such as a square shape or a hexagonal shape.
上述のような空孔５を設けると、当該圧電振動
子に対して、誘電率を下げずに、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の作用と相まつて、径
振動モード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 holes 5 as described above, it is possible to give the piezoelectric vibrator characteristics similar to anisotropy without lowering the dielectric constant. Coupled with the effect of 4, the radial vibration mode or the lateral 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ｌが圧電振動子としての固有共振周
波数f0の波長λより小さくなるように選定し、角
形状に形成した場合には、対角線長ｌを最大口径
とし、ｌ＜λとなるように選定する。 When the opening of the hole 5 is circular, the diameter l is selected to be smaller than the wavelength λ of the natural resonance frequency f 0 of the piezoelectric vibrator, and when the opening is square, , the diagonal length l is the maximum aperture, and the diameter is selected so that l<λ.
上述のように、空孔５を、その最大口径ｌが共
振周波数f0による音場媒質中の音波の波長λより
小さくなるように形成すると、音響負荷が見掛け
上大きくなり水中へ超音波を放射するに当つてパ
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、超音波パルス
幅が短くなつて、距離分解能が向上する。 As mentioned above, if the hole 5 is formed so that its maximum diameter l is smaller than the wavelength λ of the sound wave in the sound field medium due to the resonance frequency f 0 , the acoustic load will apparently increase and the ultrasonic wave will be emitted into the water. When pulse-driven, the underwater mechanical quality factor Qm is smaller than that of conventional piezoelectric vibrators, the ultrasonic pulse width is shortened, and distance resolution is improved.
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
上における断面図である。この実施例の特徴は、
圧電磁器素体１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に音響的損失の
大きい物質４を被着させたことである。圧電磁器
素体１の外周縁１０１を規則性のない不規則縁に
すると、異方性に類似した振動特性を持つように
なり、音響的損失の大きい負荷媒質４及び空孔５
による作用と相まつて、横振動モードが更に効果
的に抑制され、スプリアスが一層低減される。 FIG. 5 is a plan view of still another embodiment of the piezoelectric vibrator according to the present invention, and FIG. 6 is a sectional view taken along the line A2 - A2 in FIG. The features of this embodiment are:
The outer peripheral edge 101 of the piezoelectric ceramic body 1 is formed into an irregularly uneven edge, and the irregular outer peripheral edge 101 is coated with a substance 4 having a large acoustic loss. If the outer peripheral edge 101 of the piezoelectric ceramic body 1 is made into an irregular edge without regularity, it will have vibration characteristics similar to anisotropy, and the load medium 4 and holes 5 with large acoustic losses will have vibration characteristics similar to anisotropy.
Coupled with this effect, the transverse vibration mode is more effectively suppressed, and spurious waves are further reduced.
本発明の効果
以上述べたように、本発明に係る圧電振動子
は、圧電磁器素体の外周縁に音響的損失の大きい
負荷媒質を被着させたことを特徴とするから径振
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ができる。Effects of the Present Invention As described above, the piezoelectric vibrator according to the present invention is characterized in that a load medium with a large acoustic loss is coated on the outer periphery of the piezoelectric ceramic body, so that the piezoelectric vibrator has a radial vibration mode, a lateral vibration mode, and a lateral vibration mode. It is possible to provide a piezoelectric vibrator with reduced spurious components by reducing the vibration mode and its harmonic vibration mode.
第１図は本発明に係る圧電振動子の平面図、第
２図は同じくその正面断面図、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
４図は第３図A1−A1線上における断面図、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。
１…圧電磁器素体、２，３…電極、４…音響的
損失の大きな負荷媒質、５…空孔、１０１…外周
縁。
FIG. 1 is a plan view of a piezoelectric vibrator according to the present invention, FIG. 2 is a front sectional view thereof, FIG. 3 is a plan view of another embodiment of the piezoelectric vibrator according to the present invention, and FIG. Figure 3: Cross-sectional view along line A 1 - A 1 , No. 5
The figure is a plan view of yet another embodiment of the piezoelectric vibrator according to the present invention, FIG. 6 is a sectional view taken along line A 2 -A 2 in FIG. 5, and FIG. 7 is a perspective view of a conventional piezoelectric vibrator. . DESCRIPTION OF SYMBOLS 1... Piezoelectric ceramic body, 2, 3... Electrode, 4... Load medium with large acoustic loss, 5... Hole, 101... Outer periphery.
Claims (1)
負荷媒質を被着させたことを特徴とする圧電振動
子。 ２ 前記音響的損失の大きい負荷媒質は、フエラ
イト混入ゴム、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。 ３ 前記圧電磁気器体の外周縁が不規則的形状と
なつ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。 ４ 前記圧電磁器素体は、その厚み方向あるいは
縦方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。 ５ 前記空孔は、前記圧電磁器素体の厚み方向あ
るい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。 ６ 前記空孔は、その最大口径が共振周波数によ
る音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。 ７ 前記圧電磁器素体の厚み方向或いは縦方向の
両面に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。[Scope of Claims] 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. 2. The piezoelectric vibrator according to claim 1, wherein the load medium with large acoustic loss is rubber mixed with ferrite, epoxy resin mixed with metal powder, or the like. 3. Claim 1, wherein the outer periphery of the piezoelectric magnetic body has an irregular shape.
The piezoelectric vibrator according to item 1 or 2. 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 longitudinal direction. 5. The piezoelectric vibrator according to claim 4, wherein the holes penetrate through the piezoelectric ceramic body in a thickness direction or a longitudinal direction. 6. The piezoelectric vibrator 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. . 7. Claims 1, 2, 3, 4, 5, or 6, characterized in that the piezoelectric ceramic body has electrodes on both sides in the thickness direction or longitudinal direction. Piezoelectric vibrator described in.
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 JPS6199497A (en) | 1986-05-17 |
| JPH0462517B2 true 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 |
|---|---|
| JPS6199497A (en) | 1986-05-17 |
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