JPH0462516B2 - - Google Patents
Info
- Publication number
- JPH0462516B2 JPH0462516B2 JP22083584A JP22083584A JPH0462516B2 JP H0462516 B2 JPH0462516 B2 JP H0462516B2 JP 22083584 A JP22083584 A JP 22083584A JP 22083584 A JP22083584 A JP 22083584A JP H0462516 B2 JPH0462516 B2 JP H0462516B2
- Authority
- JP
- Japan
- Prior art keywords
- honeycomb
- present
- vibrator
- vibration mode
- shaped vibrator
- 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
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１０
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 Conventional piezoelectric vibrators of this type generally have a 10th
As shown in the figure, a piezoelectric ceramic body 1 made of barium titanate porcelain or PZT piezoelectric porcelain, etc., is formed into a flat plate shape such as a disk shape or a square plate shape. It had a structure that formed 3. Polarization direction of piezoelectric ceramic body 1 P 1
Normally, the direction corresponds to 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１０図に示した従来の圧電振
動子においては、厚みあるいは縦振動モードの外
に、大きな径振動モードもしくは横振動モード及
びその高調波振動モードが発生し、スプリアスが
大きくなるうえ、魚群探知機等の音響機器または
超音波診断装置等のパルス超音波送受波器に用い
た場合、機械的品質係数Qmが高く、超音波パル
ス幅が長くなり、別離分解能が悪くなると言う問
題があつた。Disadvantages of the Prior Art However, in the conventional piezoelectric vibrator shown in Fig. 10, in addition to the thickness or longitudinal vibration mode, a large diameter vibration mode or transverse vibration mode and its harmonic vibration mode occur, resulting in large spurious waves. Moreover, when used in acoustic equipment such as fish finders or pulsed ultrasonic transducers such as ultrasonic diagnostic equipment, the mechanical quality factor Qm is high, the ultrasonic pulse width becomes long, and the separation resolution deteriorates. There 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、
径振動モードもしくは横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
ると同時に、機械的品質係数Qmを低下させ、水
中や生体組織内での超音波パルス幅を短くして距
離分解能を向上させ、魚群探知機などの大中音響
機器または超音波診断用探触子等に使用するのに
好適な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,
By reducing the radial vibration mode, transverse vibration mode, and their harmonic vibration modes to reduce spurious vibrations, the mechanical quality factor Qm is reduced, and the ultrasonic pulse width in water and biological tissue is shortened to improve distance resolution. It is an object of the present invention to provide a honeycomb-shaped vibrator suitable for use in large and medium-sized acoustic equipment such as fish finders, ultrasonic diagnostic probes, etc.
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、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、各空孔の最大口径を共振
周波数の波長と同程度あるいはそれ以下にしたこ
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 large number of holes in the thickness or longitudinal direction of the piezoelectric ceramic body, and the maximum diameter of each hole is set to the wavelength of the resonant frequency. It is characterized by the same level or lower level.
実施例
第１図は本発明に係るハニカム状振動子の斜視
図、第２図は同じく拡大断面図である。図におい
て、第１０図と同一の参照符号は同一性である構
成部分を示している。この実施例では、円板状に
形成された圧電磁器素体１の厚み方向あるいは縦
方向に、適当な断面積比率で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、六角または
八角等の角形状に形成してもよい。また、圧電磁
器素体１は円板状に限らず、角板状であつてもよ
い。更に、円形状の空孔と角形状の空孔とを混在
させてもよい。Embodiment FIG. 1 is a perspective view of a honeycomb-shaped vibrator according to the present invention, and FIG. 2 is an enlarged sectional view thereof. In the figure, the same reference numerals as in FIG. 10 indicate identical components. In this embodiment, a large number of holes 4 in the form of through-holes are formed in the thickness direction or the longitudinal direction of the piezoelectric ceramic body 1 formed in the shape of a disk at an appropriate cross-sectional area ratio. In this example, the holes 4 are
Although it has a circular shape, it may also be formed into a rectangular shape such as a square, hexagon, or octagon. Moreover, the piezoelectric ceramic body 1 is not limited to a disk shape, but may be a square plate shape. Furthermore, circular holes and square holes may be mixed.
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、誘電率を下げずに、異方性に
類似した特性を持たせ、径振動モードまたは横振
動モードを小さくして、スプリアス成分を低減さ
せることができる。 When the holes 4 as described above are provided, the honeycomb-shaped vibrator is given characteristics similar to anisotropy without lowering the dielectric constant, and the radial vibration mode or the transverse vibration mode is reduced. Spurious components can be reduced.
空孔７は、その最大口径が当該ハニカム状振動
子の持つ厚み縦振動の固有共振周波数f0による音
場媒質中の音波の波長λと同程度かそれより小さ
くなるように設定する。即ち、空孔７の口形を円
形状とした場合には、その直径ｌが共振周波数f0
の波長λと同程度かそれより小さくなるように選
定する。また空孔７の口形を角形状に形成した場
合には、第３図及び第４図に示すように、対角線
長ｌを最大口径とし、ｌ＜λとなるように選定す
る。 The holes 7 are set so that their maximum diameter is comparable to or smaller than the wavelength λ of the sound wave in the sound field medium at the natural resonant frequency f 0 of the thickness longitudinal vibration of the honeycomb-shaped vibrator. That is, when the mouth shape of the hole 7 is circular, its diameter l is the resonant frequency f 0
The wavelength λ is selected to be about the same as or smaller than the wavelength λ. When the opening of the hole 7 is formed into a rectangular shape, as shown in FIGS. 3 and 4, the diagonal length l is the maximum diameter, and the opening is selected so that l<λ.
上述のように、空孔７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と同
程度かそれ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した場合、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 7 is formed so that its maximum diameter l is equal to or 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, When pulse driving is used to emit ultrasonic waves into water, the mechanical quality factor Qm in water is smaller than that of conventional piezoelectric vibrators, the ultrasonic pulse width is shortened, and distance resolution is improved.
次に実測データを上げて本発明の効果を更に具
体的に説明する。第５図は第１０図に示した従来
の圧電振動子を空中で駆動した場合の周波数特性
図、第６図は同じく水中で駆動した場合の周波数
特性図である。第７図は本発明に係るハニカム状
振動子を空中で駆動した場合の周波数特性図、第
８図は同じく水中で駆動した場合の周波数特性図
である。 Next, the effects of the present invention will be explained in more detail using actual measurement data. FIG. 5 is a frequency characteristic diagram when the conventional piezoelectric vibrator shown in FIG. 10 is driven in the air, and FIG. 6 is a frequency characteristic diagram when it is similarly driven in water. FIG. 7 is a frequency characteristic diagram when the honeycomb-shaped vibrator according to the present invention is driven in the air, and FIG. 8 is a frequency characteristic diagram when it is similarly driven in water.
まず、第５図及び第６図を見ると明らかなよう
に、従来の圧電振動子では、40kHz〜250kHz付近
に、径振動モードまたは横振動モードによる非常
に大きなスプリアスが発生する。これに対して、
本発明に係るハニカム状振動子は、第７図及び第
８図から明らかなように、空中では40kHz付近
で、また水中では30kHz付近で、小さな横振動モ
ードによるスプリアスが見られるだけで、大幅な
スプリアス改善効果が得られている。 First, as is clear from FIGS. 5 and 6, in the conventional piezoelectric vibrator, extremely large spurious waves due to the radial vibration mode or the lateral vibration mode occur in the vicinity of 40 kHz to 250 kHz. On the contrary,
As is clear from FIGS. 7 and 8, the honeycomb-shaped vibrator according to the present invention exhibits only a small spurious vibration due to a transverse vibration mode at around 40 kHz in the air and around 30 kHz in water; A spurious improvement effect has been obtained.
次に第９図は第１０図に示した従来の圧電振動
子及び本発明に係るハニカム状振動子について、
空中で駆動した場合と、水中で駆動した場合の機
械的品質係数Qmの変化を示す特性図である。図
において、白抜き丸印は従来の圧電振動子の特
性、黒丸印は本発明に係るハニカム状振動子の特
性を示す。この特性図から明らかなように、本発
明に係るハニカム状振動子は、水中での機械的品
質係数Qmが従来の圧電振動子より著しく低くな
つており、距離分解能に優れたハニカム状振動子
となることが解る。 Next, FIG. 9 shows the conventional piezoelectric vibrator and the honeycomb-shaped vibrator according to the present invention shown in FIG.
FIG. 3 is a characteristic diagram showing changes in mechanical quality factor Qm when driven in the air and when driven in water. In the figure, open circles indicate the characteristics of the conventional piezoelectric vibrator, and black circles indicate the characteristics of the honeycomb-shaped vibrator according to the present invention. As is clear from this characteristic diagram, the honeycomb-shaped vibrator according to the present invention has a significantly lower mechanical quality factor Qm in water than the conventional piezoelectric vibrator, and is superior to the honeycomb-shaped vibrator with excellent distance resolution. I understand what will happen.
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、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、各空孔の最大口径を振動子の共
振周波数による音場媒質中の音波の波長と同程度
かそれより小さくしたことを特徴とし、径振動モ
ードもしくは横振動モード及びその高調波振動モ
ードを小さくして、スプリアスを低減させると同
時に、機械的品質係数Qmを低下させ、水中ある
いは生体組織中における超音波パルス幅を短くし
て距離分解能を向上させ、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するのに好適なハニカム状振
動子を提供することができる。Effects of the Invention As described above, the honeycomb-shaped vibrator according to the present invention has a large number of holes in the thickness or longitudinal direction of the piezoelectric ceramic body, and the maximum diameter of each hole is determined by the resonant frequency of the vibrator. It is characterized by having a wavelength that is the same as or smaller than the wavelength of the sound wave in the sound field medium, and reduces the radial vibration mode, the transverse vibration mode, and its harmonic vibration modes, reducing spurious waves and improving the mechanical quality factor. By lowering Qm and shortening the ultrasonic pulse width underwater or in biological tissue, it improves distance resolution, and is used in fish finders, echo sounders, acoustic detectors, underground buried object searchers, ultrasonic flaw detectors, and ultrasonic flaw detectors. It is possible to provide a honeycomb-shaped vibrator suitable for use in an ultrasonic wave transmitting/receiving vibrator or a Languevent vibrator for the purpose of transmitting and receiving pulsed ultrasonic waves such as in a sonic diagnostic device.
第１図は本発明に係るハニカム状振動子の斜視
図、第２図は同じく拡大断面図、第３図及び第４
図は空孔を角形状とした場合の最大口径を定める
方法を説明する図、第５図は従来の圧電振動子を
空中で駆動した場合の周波数特性図、第６図は同
じく水中で駆動した場合の周波数特性図、第７図
は本発明に係るハニカム状振動子を空中で駆動し
た場合の周波数特性図、第８図は同じく水中で駆
動した場合の周波数特性図、第９図は従来の圧電
振動子及び本発明に係るハニカム状振動子につい
て、空中で駆動した場合と、水中で駆動した場合
の機械的品質係数Qmの変化を示す特性図、第１
０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。
FIG. 1 is a perspective view of a honeycomb-shaped vibrator according to the present invention, FIG. 2 is an enlarged sectional view, and FIGS.
The figure is a diagram explaining the method for determining the maximum diameter when the hole is square-shaped, Figure 5 is a frequency characteristic diagram when a conventional piezoelectric vibrator is driven in the air, and Figure 6 is a diagram of the frequency characteristic when the conventional piezoelectric vibrator is driven in water. FIG. 7 is a frequency characteristic diagram when the honeycomb-shaped vibrator according to the present invention is driven in the air, FIG. 8 is a frequency characteristic diagram when the honeycomb-shaped vibrator according to the present invention is driven underwater, and FIG. Characteristic diagram 1 showing changes in mechanical quality factor Qm when driving a piezoelectric vibrator and a honeycomb-shaped vibrator according to the present invention in the air and in water.
FIG. 0 is a perspective view of a conventional piezoelectric vibrator. 1... Piezoelectric ceramic body, 2, 3... Electrode, 4... Hole.
Claims (1)
空孔を設け、各空孔の最大口径を共振周波数の波
長と同程度、あるいはそれ以下にしたことを特徴
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項または第２項に記載のハニカム状振動
子。[Claims] 1. A honeycomb characterized in that a large number of holes are provided in the thickness or longitudinal direction of a piezoelectric ceramic body, and the maximum diameter of each hole is set to be equal to or smaller than the wavelength of a resonant frequency. shaped oscillator. 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 vibrator according to claim 1 or 2, 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 |
|---|---|---|---|
| JP22083584A JPS6199496A (en) | 1984-10-20 | 1984-10-20 | Honeycomb oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22083584A JPS6199496A (en) | 1984-10-20 | 1984-10-20 | Honeycomb oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6199496A JPS6199496A (en) | 1986-05-17 |
| JPH0462516B2 true JPH0462516B2 (en) | 1992-10-06 |
Family
ID=16757285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22083584A Granted JPS6199496A (en) | 1984-10-20 | 1984-10-20 | Honeycomb oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6199496A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2745147B2 (en) * | 1989-03-27 | 1998-04-28 | 三菱マテリアル 株式会社 | Piezoelectric transducer |
| JPH08275285A (en) * | 1995-03-30 | 1996-10-18 | Nec Corp | Composite vibrator and array |
| CN114274210B (en) * | 2021-12-29 | 2024-04-05 | 杭州电子科技大学 | Ultrasonic lace scribing and cutting disc cutter for wave-absorbing honeycomb finish machining and disc cutter assembly |
-
1984
- 1984-10-20 JP JP22083584A patent/JPS6199496A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6199496A (en) | 1986-05-17 |
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