JPH0462520B2 - - Google Patents
Info
- Publication number
- JPH0462520B2 JPH0462520B2 JP22279984A JP22279984A JPH0462520B2 JP H0462520 B2 JPH0462520 B2 JP H0462520B2 JP 22279984 A JP22279984 A JP 22279984A JP 22279984 A JP22279984 A JP 22279984A JP H0462520 B2 JPH0462520 B2 JP H0462520B2
- Authority
- JP
- Japan
- Prior art keywords
- honeycomb
- ceramic body
- piezoelectric ceramic
- thickness
- longitudinal direction
- 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 12
- 230000001788 irregular Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 description 3
- 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
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000010287 polarization Effects 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- General Physics & Mathematics (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、音響測深機、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
に使用されるハニカム状振動子に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to fish finders, echo sounders, acoustic detectors, underground buried object searchers, ultrasonic flaw detectors, ultrasonic diagnostic devices, etc. The present invention relates to a honeycomb-shaped 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３図
に示すように、チタン酸バリウム系またはジルコ
ン酸鉛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P1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 This type of conventional piezoelectric vibrator is generally formed into a flat plate shape such as a disk shape or a square plate shape using barium titanate-based or lead zirconate-based piezoelectric ceramics, as shown in FIG. The piezoelectric ceramic body 1 had a structure in which electrodes 2 and 3 were formed on both sides in the thickness or longitudinal direction. The polarization direction P 1 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３図に示した従来のハニカム
状振動子においては、厚みあるいは縦振動モー
ド、径振動モードなどの外に、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 honeycomb-shaped vibrator shown in Fig. 3, in addition to the thickness, longitudinal vibration mode, radial vibration mode, etc., the transverse vibration mode and its harmonic vibration mode are large, and this causes 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、
横振動モード、径振動モード及びその高調波振動
モードを小さくし、スプリアスを低減させたハニ
カム状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 honeycomb-shaped vibrator in which the transverse vibration mode, the radial vibration mode, and their harmonic vibration modes are reduced, and spurious vibrations are reduced.
本発明の構成
上記目的を達成するため、本発明に係るハニカ
ム状振動子は、外周縁が不規則性となつている圧
電磁器素体の厚みあるいは縦方向に多数の空孔を
設けたことを特徴とする。Structure of the Present Invention In order to achieve the above object, the honeycomb-shaped vibrator according to the present invention has a piezoelectric ceramic body having an irregular outer periphery, and a large number of holes are provided in the thickness or longitudinal direction. Features.
実施例
第１図は本発明に係るハニカム状振動子の平面
図、第２図は第１図のA1−A1線上における断面
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、圧電磁器素体１の厚みあるいは縦方向に、
多数の貫通孔状の空孔４を形成してある。この実
施例では空孔４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。Embodiment FIG. 1 is a plan view of a honeycomb-shaped vibrator according to the present invention, and FIG. 2 is a sectional view taken along line A 1 -A 1 in FIG. 1. In the figure, the same reference numerals as in FIG. 3 indicate the same components. In this embodiment, the thickness or longitudinal direction of the piezoelectric ceramic body 1 is
A large number of through holes 4 are formed. In this embodiment, the holes 4 have a circular shape, but they may also be formed in a rectangular shape such as a square shape or a hexagonal shape.
上述のような空孔４を設けると、当該ハニカム
状振動子に対して、異方性に類似した特性を持た
せ、横振動モードまたは径振動モードを少なく
し、スプリアスを低減させることができる。 By providing the holes 4 as described above, it is possible to impart characteristics similar to anisotropy to the honeycomb-shaped vibrator, reduce transverse vibration mode or radial vibration mode, and reduce spurious waves.
次に、圧電磁器素体１は、従来は円板状または
角板状等の規則性外周縁となつていたが、本発明
においては、外周縁１０１は不規則な凹凸縁とな
つている。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、横振動モードが抑制さ
れ、スプリアスが一層低減される。 Next, although the piezoelectric ceramic body 1 conventionally has a regular outer peripheral edge such as a disk shape or a rectangular plate shape, in the present invention, the outer peripheral edge 101 has an irregular uneven edge. When the outer peripheral edge 101 of the piezoelectric ceramic body 1 is formed into an irregular edge without regularity, it has vibration characteristics similar to anisotropy, suppresses the transverse vibration mode, and further reduces spurious waves.
前記空孔４は、その口径が円形状である場合に
は、その直径ｌがハニカム状振動子としての固有
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 hole 4 has a circular diameter, the hole 4 is selected so that its diameter l is smaller than the wavelength λ of the sound wave in the sound field medium due to the natural resonance frequency f 0 of the honeycomb-shaped vibrator, When it is formed into a rectangular shape, the diagonal length l is the maximum aperture, and the selection is made so that l<λ.
上述のように、空孔４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
従来のハニカム状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 4 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 becomes smaller than that of conventional honeycomb-shaped transducers, the ultrasonic pulse width becomes shorter, and distance resolution improves.
本発明の効果
以上述べたように、本発明に係るハニカム状振
動子は、外周縁が不規則性となつている圧電磁器
素体の厚みあるいは縦方向に多数の空孔を設けた
ことを特徴し、横振動モード、径振動モード及び
その高調波振動モードを小さくし、スプリアスを
低減させたハニカム状振動子を提供することがで
きる。Effects of the Present Invention As described above, the honeycomb-shaped vibrator according to the present invention is characterized in that a large number of holes are provided in the thickness or vertical direction of the piezoelectric ceramic body whose outer periphery is irregular. However, it is possible to provide a honeycomb-shaped vibrator in which the transverse vibration mode, the radial vibration mode, and their harmonic vibration modes are reduced, and spurious components are reduced.
第１図は本発明に係るハニカム状振動子の平面
図、第２図は第１図のA1−A1線上における断面
図、第３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…空孔、
１０１…外周縁。
FIG. 1 is a plan view of a honeycomb-shaped vibrator according to the present invention, FIG. 2 is a sectional view taken along line A 1 -A 1 in FIG. 1, and FIG. 3 is a perspective view of a conventional piezoelectric vibrator. 1... Piezoelectric ceramic body, 2, 3... Electrode, 4... Hole,
101...Outer periphery.
Claims (1)
の厚みあるいは縦方向に多数の空孔を設けたこと
を特徴とするハニカム状振動子。 ２ 前記空孔は、前記圧電磁器素体の厚みあるい
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１項に記載のハニカム状振動子。 ３ 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１項
または第２項に記載のハニカム状振動子。 ４ 前記圧電磁器素体の厚みあるいは縦方向の両
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項または第３項に記載のハニカム
状振動子。[Scope of Claims] 1. A honeycomb-shaped vibrator characterized in that a large number of holes are provided in the thickness or longitudinal direction of a piezoelectric ceramic body whose outer periphery is irregular. 2. The honeycomb-shaped vibrator according to claim 1, wherein the holes penetrate through the piezoelectric ceramic body in the thickness or longitudinal direction. 3. The honeycomb-shaped vibration according to claim 1 or 2, wherein the holes are formed so that the maximum diameter thereof is smaller than the wavelength of the sound wave in the sound field medium due to the resonance frequency. Child. 4. The honeycomb-shaped vibrator according to claim 1, 2, or 3, characterized in that the piezoelectric ceramic body has electrodes on both sides in the thickness or longitudinal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22279984A JPS61101199A (en) | 1984-10-23 | 1984-10-23 | Honeycomb-like vibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22279984A JPS61101199A (en) | 1984-10-23 | 1984-10-23 | Honeycomb-like vibrator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61101199A JPS61101199A (en) | 1986-05-20 |
| JPH0462520B2 true JPH0462520B2 (en) | 1992-10-06 |
Family
ID=16788076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22279984A Granted JPS61101199A (en) | 1984-10-23 | 1984-10-23 | Honeycomb-like vibrator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61101199A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017089609A2 (en) * | 2015-11-26 | 2017-06-01 | Elmos Semiconductor Aktiengesellschaft | Oscillating element for a multiple resonant frequency ultrasonic transducer |
-
1984
- 1984-10-23 JP JP22279984A patent/JPS61101199A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61101199A (en) | 1986-05-20 |
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