JPH06269094A - Ultrasonic wave transmitter-receiver - Google Patents
Ultrasonic wave transmitter-receiverInfo
- Publication number
- JPH06269094A JPH06269094A JP5080299A JP8029993A JPH06269094A JP H06269094 A JPH06269094 A JP H06269094A JP 5080299 A JP5080299 A JP 5080299A JP 8029993 A JP8029993 A JP 8029993A JP H06269094 A JPH06269094 A JP H06269094A
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric body
- receiver
- ultrasonic wave
- wave transmitter
- piezoelectric
- 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.)
- Pending
Links
Landscapes
- Transducers For Ultrasonic Waves (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、特に低周波数で使用す
る超音波送受波器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic wave transmitter / receiver used particularly at a low frequency.
【０００２】[0002]
【従来の技術】図２は、従来のこの種の超音波送受波器
の構成を示す断面図で、図において、１はピエゾ素子を
用いた圧電体（圧電振動子）、２は電極、３はリード
線、４はケース、５は樹脂、６は信号発生源（電源）で
ある。2. Description of the Related Art FIG. 2 is a cross-sectional view showing the structure of a conventional ultrasonic transmitter / receiver of this kind. In the drawing, 1 is a piezoelectric body (piezoelectric vibrator) using a piezoelectric element, 2 is an electrode, and 3 Is a lead wire, 4 is a case, 5 is resin, and 6 is a signal generation source (power supply).
【０００３】従来の超音波送受波器は図２に示すよう
に、圧電体１を所定の動作周波数になるようにその厚み
を研磨加工し、さらに分極処理を施してからケース４の
所定の位置に設置し、樹脂５でモールドして構成され、
信号発生源６から信号が印加されることにより、圧電体
１が振動子として信号に合わせて振動し、超音波送波器
として動作する。また、圧電体１の厚みで振動周波数が
定まるため、低周波数の信号で動作させるためには圧電
体１の厚みを大きくする必要がある。As shown in FIG. 2, a conventional ultrasonic wave transmitter / receiver has a piezoelectric body 1 whose thickness is polished so as to have a predetermined operating frequency, which is then subjected to a polarization treatment, and then a predetermined position of a case 4 It is installed in and molded with resin 5.
When a signal is applied from the signal generation source 6, the piezoelectric body 1 vibrates as a vibrator in accordance with the signal and operates as an ultrasonic wave transmitter. Further, since the vibration frequency is determined by the thickness of the piezoelectric body 1, it is necessary to increase the thickness of the piezoelectric body 1 in order to operate with a low frequency signal.
【０００４】[0004]
【発明が解決しようとする課題】従来の超音波送受波器
は以上のように構成されており、低周波数での使用に適
さないという問題がある。すなわち、低周波数の信号で
動作させるためには、上述のように圧電体の厚みを大き
くする必要があるが、厚みが大きくなると共振インピー
ダンスが高くなり、同じ電力で動作させるためには高電
圧の信号が必要となる。従って信号発生源等の電気回路
を、その高電圧に耐えられる回路にしておく必要があ
る。また、圧電体の厚みが大きくなると、受波時におい
ても入力端でインピーダンスが大きくなるため雑音の影
響を受け易くなり、Ｓ／Ｎ比が低下する。The conventional ultrasonic wave transmitter / receiver is constructed as described above, and has a problem that it is not suitable for use at low frequencies. That is, in order to operate with a low frequency signal, it is necessary to increase the thickness of the piezoelectric body as described above, but as the thickness increases, the resonance impedance increases, and in order to operate with the same power, a high voltage A signal is needed. Therefore, it is necessary to make an electric circuit such as a signal generation source a circuit capable of withstanding the high voltage. Further, when the thickness of the piezoelectric body becomes large, the impedance becomes large at the input end even when receiving a wave, so that the piezoelectric body is easily affected by noise and the S / N ratio decreases.
【０００５】本発明はかかる問題点を解決するためにな
されたものであり、特に低周波数での使用に適した超音
波送受波器を提供することを目的としている。The present invention has been made to solve the above problems, and it is an object of the present invention to provide an ultrasonic transducer which is particularly suitable for use at a low frequency.
【０００６】[0006]
【課題を解決するための手段】本発明に係わる超音波送
受波器は、多孔質圧電体を用いて低周波数で使用する場
合でも圧電体の厚さをできるだけ小さくして、インピー
ダンスを低減させ、さらにそのインピーダンスを低減さ
せるため変換トランスを超音波送受波器内に組み込んだ
ことを特徴とする。In the ultrasonic transducer according to the present invention, the thickness of the piezoelectric body is made as small as possible to reduce the impedance even when the porous piezoelectric body is used at a low frequency. Further, a conversion transformer is incorporated in the ultrasonic wave transmitter / receiver in order to reduce its impedance.
【０００７】[0007]
【実施例】以下、本発明の一実施例を図面を用いて説明
する。図１は本発明における超音波送受波器の一実施例
を示す断面図であり、図において、１Ａは多孔質圧電
体、２は電極、３ａ，３ｂはリード線、４はケース、５
は樹脂、６は信号発生源、７は変換トランスである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of an ultrasonic wave transmitter / receiver according to the present invention. In the figure, 1A is a porous piezoelectric material, 2 is electrodes, 3a and 3b are lead wires, 4 is a case, 5
Is a resin, 6 is a signal generation source, and 7 is a conversion transformer.
【０００８】次に多孔質圧電体１Ａについて説明する。
多孔質圧電材質については、本願出願人と同一出願人に
係る先の出願、特願平４−１０３８２２号「圧電素子お
よびその製造方法」において詳しく説明しているが、例
えば、ジルコン酸チタン酸鉛（ＰＺＴ），チタン酸鉛，
チタン酸バリウム（ＢａＴｉＯ3 ）等の圧電材料の粉末
（平均粒径１．２μｍのＰＺＴ等）と、例えば平均粒径
３０μｍのメタクリル樹脂等の有機材料の粉末とを適当
な比率で混合して、成形，焼成を行い、さらに１ｋＶ／
ｍｍ程度の電界を印加し、分極処理を行うことで得られ
るものであり、その空孔率が増加するにしたがって歪み
量が大きくなるため振動音速を低下させることができ
る。従って、空孔率の大きい多孔質圧電体１Ａを用いる
ことで、低周波数で使用する場合でも圧電体の厚さをよ
り小さくすることが可能となり、その結果、共振インピ
ーダンスを低減できる。Next, the porous piezoelectric body 1A will be described.
The porous piezoelectric material is described in detail in a previous application filed by the same applicant as the applicant of the present application, Japanese Patent Application No. 4-103822 "Piezoelectric element and its manufacturing method". For example, lead zirconate titanate is used. (PZT), lead titanate,
A powder of piezoelectric material such as barium titanate (BaTiO 3 ) (PZT or the like having an average particle diameter of 1.2 μm) and a powder of an organic material such as methacrylic resin having an average particle diameter of 30 μm are mixed at an appropriate ratio, Molded and fired, 1kV /
It is obtained by applying an electric field of about mm and performing a polarization treatment. Since the amount of strain increases as the porosity increases, the vibration sound velocity can be reduced. Therefore, by using the porous piezoelectric body 1A having a large porosity, it is possible to further reduce the thickness of the piezoelectric body even when it is used at a low frequency, and as a result, it is possible to reduce the resonance impedance.
【０００９】また、図１に示すように本実施例では、さ
らにインピーダンスを低減させるべく変換トランス７を
ケース４内に樹脂５で埋め込んだ構造としている。実験
では、変換トランス７に巻線比１対４のトランスを用い
た場合、図２に示す従来の超音波送受波器では入力端の
インピーダンスが３．７ｋΩ以上あったが、本実施例で
は３８０Ωとなり、入力インピーダンスを約１０分の１
に低減でき、入力信号電圧を約３分の１に低減できた。Further, as shown in FIG. 1, in this embodiment, the conversion transformer 7 is embedded in the case 4 with the resin 5 in order to further reduce the impedance. In the experiment, when a transformer having a winding ratio of 1: 4 was used as the conversion transformer 7, the impedance at the input end was 3.7 kΩ or more in the conventional ultrasonic wave transmitter / receiver shown in FIG. And the input impedance is about 1/10
It was possible to reduce the input signal voltage to about 1/3.
【００１０】[0010]
【発明の効果】本発明の超音波送受波器は以上説明した
ように、多孔質圧電体を用いて低周波数で使用する場合
でも圧電体の厚さをできるだけ小さくしてインピーダン
スの低減を図り、さらにそのインピーダンスを低減させ
るための変換トランスを超音波送受波器内に組み込むこ
とにより、動作用電気回路を安価に構成でき、また、Ｓ
／Ｎ比の高い音響特性が得られる等の効果がある。As described above, the ultrasonic transmitter / receiver of the present invention uses the porous piezoelectric body to reduce the impedance by reducing the thickness of the piezoelectric body as much as possible even when it is used at a low frequency. Furthermore, by incorporating a conversion transformer for reducing the impedance in the ultrasonic wave transmitter / receiver, the operating electric circuit can be constructed at low cost, and the S
There is an effect that acoustic characteristics with a high / N ratio can be obtained.
【図１】本発明の一実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】従来のこの種の超音波送受波器の構成を示す断
面図である。FIG. 2 is a sectional view showing a configuration of a conventional ultrasonic transmitter / receiver of this type.
１Ａ 多孔質圧電体 ２ 電極 ５ 樹脂 ６ 信号発生源 ７ 変換トランス 1A Porous piezoelectric body 2 Electrode 5 Resin 6 Signal generation source 7 Conversion transformer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大橋 寛 東京都三鷹市下連雀５丁目１番１号 日本 無線株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroshi Ohashi 5-1-1 Shimorenjaku, Mitaka City, Tokyo Japan Radio Co., Ltd.
Claims (1)
ン酸鉛（ＰＺＴ）、チタン酸バリウム（ＢａＴｉＯ3 ）
を多孔質に形成した多孔質圧電体を用い、この多孔質圧
電体の電極と超音波送受波器の入出力端子との間に電圧
変換トランスを挿入した構造を特徴とする超音波送受波
器。1. The piezoelectric material used is, for example, lead zirconate titanate (PZT) or barium titanate (BaTiO 3 ).
An ultrasonic wave transmitter / receiver having a structure in which a voltage conversion transformer is inserted between the electrode of the porous piezoelectric body and the input / output terminals of the ultrasonic wave transmitter / receiver. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5080299A JPH06269094A (en) | 1993-03-16 | 1993-03-16 | Ultrasonic wave transmitter-receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5080299A JPH06269094A (en) | 1993-03-16 | 1993-03-16 | Ultrasonic wave transmitter-receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06269094A true JPH06269094A (en) | 1994-09-22 |
Family
ID=13714399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5080299A Pending JPH06269094A (en) | 1993-03-16 | 1993-03-16 | Ultrasonic wave transmitter-receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06269094A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6897601B2 (en) | 2001-07-27 | 2005-05-24 | Holmberg Gmbh & Co. Kg | Piezoelectric element and an oscillation transducer with a piezoelectric element |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6378700A (en) * | 1986-09-22 | 1988-04-08 | Toshiba Corp | Composite piezoelectric ultrasonic probe |
| JPH03145707A (en) * | 1989-10-31 | 1991-06-20 | Tokin Corp | Matching circuit, variable winding ratio matching transformer and variable inductor |
-
1993
- 1993-03-16 JP JP5080299A patent/JPH06269094A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6378700A (en) * | 1986-09-22 | 1988-04-08 | Toshiba Corp | Composite piezoelectric ultrasonic probe |
| JPH03145707A (en) * | 1989-10-31 | 1991-06-20 | Tokin Corp | Matching circuit, variable winding ratio matching transformer and variable inductor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6897601B2 (en) | 2001-07-27 | 2005-05-24 | Holmberg Gmbh & Co. Kg | Piezoelectric element and an oscillation transducer with a piezoelectric element |
| KR100924618B1 (en) * | 2001-07-27 | 2009-11-02 | 홀름베르크 게엠베하 운트 코. 카게 | A piezoelectric element and an oscillation transducer with a piezoelectric element |
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