JPS6032393B2 - Ultrasonic transducer support structure - Google Patents
Ultrasonic transducer support structureInfo
- Publication number
- JPS6032393B2 JPS6032393B2 JP14175181A JP14175181A JPS6032393B2 JP S6032393 B2 JPS6032393 B2 JP S6032393B2 JP 14175181 A JP14175181 A JP 14175181A JP 14175181 A JP14175181 A JP 14175181A JP S6032393 B2 JPS6032393 B2 JP S6032393B2
- Authority
- JP
- Japan
- Prior art keywords
- absorption
- vibrator
- support structure
- transducer
- ultrasonic transducer
- 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
- 238000010521 absorption reaction Methods 0.000 claims description 20
- 239000000758 substrate Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 1
- 238000001093 holography Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
Description
【発明の詳細な説明】
本発明は超音波送受波器の支持構造、さらに詳しく言え
ば盲人の歩行補助装置のような可搬型超音波レーダなど
に用いられる比較的軽い支持構造で、送受波器を支持す
る場合に通した超音波送受波器の支持構造に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention is a support structure for an ultrasonic transducer, and more specifically, a relatively light support structure used in a portable ultrasonic radar such as a walking aid for blind people. The present invention relates to a support structure for an ultrasonic transducer when supporting an ultrasonic transducer.
まず第１図により超音波送受波器を比較的軽量な支持構
造で支持した場合の問題を略述する。First, with reference to FIG. 1, problems when an ultrasonic transducer is supported by a relatively lightweight support structure will be briefly described.
図において、１は円錐状の位相等化器、２は送受波用の
セラミック振動子である。セラミック振動子２は、支持
ボビン３を介して基板４に固定されている。In the figure, 1 is a conical phase equalizer, and 2 is a ceramic resonator for transmitting and receiving waves. Ceramic vibrator 2 is fixed to substrate 4 via support bobbin 3 .
基板４が充分な剛性と質量を具備しているときは問題が
生じないが、盲人の歩行補助のための超音波レーダなど
に応用するときは、支持構造自体を大きくすることがで
きないので以下のような問題が生じる。セラミック振動
子２を振動させると、等化器１により慣性反力が生じる
。その反力は振動系質量と振幅と角振動数の２乗の積に
比例する。振動系の質量を０．２６×１０‐３ｋ９、振
幅を２×１０‐６ｍ、振動数を４皿ＨＺとすると、その
慣性反力は３．３５ｋ９程度に達する。There is no problem when the substrate 4 has sufficient rigidity and mass, but when it is applied to an ultrasonic radar for walking assistance for blind people, the support structure itself cannot be made large, so the following method is used. A problem like this arises. When the ceramic vibrator 2 is vibrated, an inertial reaction force is generated by the equalizer 1. The reaction force is proportional to the product of the mass of the vibrating system, the amplitude, and the square of the angular frequency. Assuming that the mass of the vibration system is 0.26×10-3k9, the amplitude is 2×10-6m, and the frequency is 4 plates HZ, the inertial reaction force reaches about 3.35k9.
したがって軽量な支持構造は、この慣性反力により振動
させられ、基板４は複雑なモードで振動させられる。そ
の結果等化器１は空気に対して正しい運動を保持するこ
とができなくなる。さらに基板４の振動子により、好ま
しくない音響放射が発生する。The lightweight support structure is therefore vibrated by this inertial reaction force, and the substrate 4 is vibrated in a complex mode. As a result, the equalizer 1 is no longer able to maintain the correct motion with respect to the air. Furthermore, the transducers of the substrate 4 generate undesired acoustic radiation.
そのため対率の低下と指向特性の劣化を招いた。本発明
の目的は、比較的軽量な指示構造でも前述した慣性反力
に原因する不必要な振動を防止することができる超音波
送受波器の支持構造を提供することにある。This resulted in a decrease in relative ratio and deterioration in directivity characteristics. An object of the present invention is to provide a support structure for an ultrasonic transducer that can prevent unnecessary vibration caused by the above-mentioned inertial reaction force even with a relatively lightweight pointing structure.
前記目的を達成するために本発明による超音波送受波器
の支持構造は、一面に位相等化器を有する受送波用振動
子と、前記振動子の他面に一面が接合されている支持ボ
ビンと、前記支持ボビンの他面に一面が接合されている
吸収用振動子と、前記吸収用振動子の他面を支持する基
板と、前記吸収用振動子に生じる振動を検出する検出素
子およ．び前記検出素子出力を増幅して前記吸収用振動
子の振動を抑圧する電圧を前記吸収用振動子に印加する
帰還増幅器とからなる吸収用振動子制御回路とから構成
されている。In order to achieve the above object, a support structure for an ultrasonic transducer according to the present invention includes a transducer for receiving and transmitting waves having a phase equalizer on one surface, and a support whose one surface is bonded to the other surface of the transducer. a bobbin, an absorption vibrator whose one surface is joined to the other surface of the support bobbin, a substrate that supports the other surface of the absorption vibrator, and a detection element and a detection element that detect vibrations generated in the absorption vibrator. Yo. and a feedback amplifier that amplifies the detection element output and applies a voltage to the absorption vibrator to suppress vibrations of the absorption vibrator.
前記構成によれば、本発明の目的は完全に達成できる。According to the above configuration, the object of the present invention can be completely achieved.
以下面図を参照して、本発明による超音波送受波器の支
持構造をさらに詳しく説明する。第２図は支持構造の実
施例を示す図、第３図は吸収用振動子の実施例を示す回
路図である。The support structure for an ultrasonic transducer according to the present invention will be described in more detail with reference to the drawings below. FIG. 2 is a diagram showing an embodiment of the support structure, and FIG. 3 is a circuit diagram showing an embodiment of the absorption vibrator.
なお第２図において、先に第１図に関連して説明した部
分と共通する部分は同一の符号を付してある。本発明に
よる支持構造では、支持ボビン３を、送受波用セラミッ
ク振動子２と同様な吸収用振動子５を介して、基板４に
固定してある。Note that in FIG. 2, parts common to those previously explained in connection with FIG. 1 are given the same reference numerals. In the support structure according to the present invention, the support bobbin 3 is fixed to the substrate 4 via an absorption vibrator 5 similar to the wave transmitting/receiving ceramic vibrator 2.
図において８は受送波回路、９は前記吸収用振動子５を
制御するための吸収用振動子制御回路である。In the figure, 8 is a receiving/transmitting wave circuit, and 9 is an absorption oscillator control circuit for controlling the absorption oscillator 5.
吸収用振動子５は前述した慣性反力を受けて振動させら
れる。この振動は、振動子５の−極と接地点間に接続さ
れている検出素子７を形成する比較的低い抵抗値の抵抗
により検出される。The absorption vibrator 5 is caused to vibrate by receiving the above-mentioned inertial reaction force. This vibration is detected by a resistor having a relatively low resistance value forming a detection element 7 connected between the negative pole of the vibrator 5 and the ground point.
吸収用振動子５の池端は増幅器６の出力端子に接続され
ている。The end of the absorbing oscillator 5 is connected to the output terminal of the amplifier 6.
増幅器６の非反転入力端子は前記検出素子７の接地点に
、反転入力端子は検出素子７の他端側に接続されている
。したがって振動子５には、前記振動子５の振動を打ち
消す方向の電圧が印加されることになる。The non-inverting input terminal of the amplifier 6 is connected to the ground point of the detecting element 7, and the inverting input terminal is connected to the other end of the detecting element 7. Therefore, a voltage is applied to the vibrator 5 in a direction that cancels out the vibration of the vibrator 5.
本発明による支持構造は、以上のように構成されている
ので振動子５に譲起された振動は、完全に抑圧されて基
板４に伝達されない。本件発明者が超音波ホログラフィ
の技術を利用して、基板４の振動を観測したところ、先
に第１図で示した構造で発生していた複雑なモードの寄
生振動は完全に抑圧されていることが判明した。Since the support structure according to the present invention is constructed as described above, the vibrations exerted on the vibrator 5 are completely suppressed and are not transmitted to the substrate 4. When the inventor of the present invention observed the vibration of the substrate 4 using ultrasonic holography technology, it was found that the parasitic vibration of the complex mode that had occurred in the structure shown in FIG. 1 was completely suppressed. It has been found.
以上詳しく説明したように本発明によれば、慣性反力に
原因する支持構造の不要な振動の発生を防止することが
できるので、比較的軽量な構造で受送波器を支持するこ
とが可能となった。As explained in detail above, according to the present invention, it is possible to prevent the generation of unnecessary vibrations in the support structure caused by inertial reaction force, so it is possible to support the transducer with a relatively lightweight structure. It became.
第１図は従来の支持構造を示す図、第２図は本発明によ
る支持構造の実施例を示す図、第３図は吸収用振動子制
御回路の実施例を示す回路図である。
１・・・・・・位相等化器、２・・…・受送波用振動子
、３・・・・・・支持ボビン、４・・・・・・基板、５
・・・・・・吸収用振動子、６・・・・・・増幅器、７
・・・・・・検出素子、８・…・・受送波用回路、９・
・・・・・吸収用振動子制御回路。
外，図ズ２図
才３図FIG. 1 is a diagram showing a conventional support structure, FIG. 2 is a diagram showing an embodiment of the support structure according to the present invention, and FIG. 3 is a circuit diagram showing an embodiment of an absorption vibrator control circuit. DESCRIPTION OF SYMBOLS 1... Phase equalizer, 2... Vibrator for receiving and transmitting waves, 3... Support bobbin, 4... Substrate, 5
...Absorption oscillator, 6...Amplifier, 7
......detection element, 8... circuit for receiving and transmitting waves, 9.
...Absorption oscillator control circuit. Outside, Figures 2 and 3
Claims (1)
振動子の他面に一面が接合されている支持ボビンと、前
記支持ボビンの他面に一面が接合されている吸収用振動
子と、前記吸収用振動子の他面を支持する基板と、前記
吸収用振動子に生じる振動を検出する検出素子および前
記検出素子出力を増幅して、前記吸収用振動子の振動を
抑圧する電圧を前記吸収用振動子に印加する帰還増幅器
とからなる吸収用振動子制御回路とから構成した超音波
送受波器の支持構造。1. A wave transmitting/receiving transducer having a phase equalizer on one surface, a support bobbin having one surface bonded to the other surface of the transducer, and an absorption transducer having one surface bonded to the other surface of the support bobbin. a substrate that supports the other surface of the absorption vibrator, a detection element that detects vibrations occurring in the absorption vibrator, and a voltage that amplifies the output of the detection element and suppresses vibrations of the absorption vibrator. and an absorption transducer control circuit comprising a feedback amplifier for applying the above-mentioned absorption transducer to the absorption transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14175181A JPS6032393B2 (en) | 1981-09-10 | 1981-09-10 | Ultrasonic transducer support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14175181A JPS6032393B2 (en) | 1981-09-10 | 1981-09-10 | Ultrasonic transducer support structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5843695A JPS5843695A (en) | 1983-03-14 |
| JPS6032393B2 true JPS6032393B2 (en) | 1985-07-27 |
Family
ID=15299343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14175181A Expired JPS6032393B2 (en) | 1981-09-10 | 1981-09-10 | Ultrasonic transducer support structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6032393B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0385424U (en) * | 1989-12-18 | 1991-08-29 |
-
1981
- 1981-09-10 JP JP14175181A patent/JPS6032393B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0385424U (en) * | 1989-12-18 | 1991-08-29 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5843695A (en) | 1983-03-14 |
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