JPH0889893A - Bolted langevin transducer - Google Patents
Bolted langevin transducerInfo
- Publication number
- JPH0889893A JPH0889893A JP25931394A JP25931394A JPH0889893A JP H0889893 A JPH0889893 A JP H0889893A JP 25931394 A JP25931394 A JP 25931394A JP 25931394 A JP25931394 A JP 25931394A JP H0889893 A JPH0889893 A JP H0889893A
- Authority
- JP
- Japan
- Prior art keywords
- backing plate
- piezoelectric ceramic
- plate
- bolted langevin
- resonance frequency
- 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.)
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- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、超音波振動を利用した
洗浄機等に用いられる超音波の発生源としてのボルト締
めランジュバン型振動子に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolted Langevin type vibrator as a source of ultrasonic waves used in a washing machine utilizing ultrasonic vibration.
【０００２】[0002]
【従来の技術】従来、この種のボルト締めランジュバン
型振動子の構造は、図６に示すように、表裏両面に電極
を施し、分極した環状のＰＺＴからなる圧電セラミック
板を、ＰＢＰ材の電極板５、ＰＢＰ材からなる電気端子
６を介在させ、アルミニウムの前面板３及び裏打板４に
より、圧電セラミック板を両側より挟み、一方には、ね
じ穴を設け、前記圧電セラミックの中心を通し、ステン
レスの締め付けボルト７を他方の前面板３のねじ穴に固
定し、ナット８にて全体を締め付ける構造となってい
る。この時、振動子に電圧を加える電極の端子は、電極
板５、電気端子６をランジュバン振動子本体の外径より
も突出させて形成している。又、圧電セラミック１，２
と電極板５と電気端子６の外周には、シリコンの絶縁樹
脂９を塗布、絶縁してある。2. Description of the Related Art Conventionally, as shown in FIG. 6, the structure of this type of bolted Langevin type vibrator is such that electrodes are provided on both front and back surfaces and a piezoelectric ceramic plate made of polarized annular PZT is used as an electrode of a PBP material. A piezoelectric ceramic plate is sandwiched from both sides by a front plate 3 and a backing plate 4 made of aluminum with a plate 5 and an electric terminal 6 made of a PBP material interposed therebetween, and a screw hole is provided on one side to allow the center of the piezoelectric ceramic to pass through. The structure is such that a stainless tightening bolt 7 is fixed to the screw hole of the other front plate 3 and the whole is tightened with a nut 8. At this time, the terminal of the electrode for applying a voltage to the vibrator is formed by projecting the electrode plate 5 and the electric terminal 6 beyond the outer diameter of the Langevin vibrator main body. Also, piezoelectric ceramics 1 and 2
A silicon insulating resin 9 is applied and insulated on the outer circumferences of the electrode plate 5 and the electric terminals 6.
【０００３】[0003]
【発明が解決しようとする課題】前記前面板３、裏打板
４は、１０００〜１５００ｋｇ−ｆ・ｃｍのトルクでボ
ルト７を締め付けた際に、圧電セラミックと電極板及び
電気端子の境界面で弾性変形を起こして、圧電セラミッ
クに均一な荷重を加えることが困難になるために、圧電
セラミックの平面を均一な平面で押すことができなくな
る。このために、圧電セラミックの破壊が生じたり、振
動子の周波数特性のばらつきが大きくなる欠点があっ
た。The front plate 3 and the backing plate 4 are elastic at the boundary surface between the piezoelectric ceramic, the electrode plate and the electric terminal when the bolt 7 is tightened with a torque of 1000 to 1500 kg-f · cm. Since it becomes difficult to apply a uniform load to the piezoelectric ceramic due to deformation, it becomes impossible to push the flat surface of the piezoelectric ceramic with a uniform flat surface. For this reason, there are drawbacks that the piezoelectric ceramic is broken and the frequency characteristics of the vibrator vary greatly.
【０００４】又、利用しようとする縦振動の第１共振周
波数の近傍に、スプリアス振動（第２共振周波数で発生
する横振動）が発生する。この第２共振でのスプリアス
振動が発生すると、ボルト締め振動子の放射面の振動幅
にむらが生じる。それと同時に、駆動回路において、自
励発振とした場合、周波数飛びが発生するため、縦振動
が発生できなくなる等の問題が生ずる欠点があった。Further, spurious vibration (transverse vibration generated at the second resonance frequency) is generated in the vicinity of the first resonance frequency of the longitudinal vibration to be used. When the spurious vibration occurs at the second resonance, the vibration width of the radiation surface of the bolted vibrator becomes uneven. At the same time, when self-excited oscillation is used in the drive circuit, frequency jumps occur, which causes a problem that longitudinal vibration cannot occur.
【０００５】本発明は、ＰＺＴの圧電セラミックに加わ
る荷重を均一にし、圧電セラミックの破壊を防止し、振
動子の特性のばらつきを小さくし、高い信頼性を有する
ボルト締め振動子を提供することを目的とする。The present invention aims to provide a bolted oscillator having a high reliability by making the load applied to the piezoelectric ceramic of PZT uniform, preventing the destruction of the piezoelectric ceramic, reducing the variation in the characteristics of the oscillator, and having high reliability. To aim.
【０００６】[0006]
【課題を解決するための手段】本発明によれば、裏打板
と、前面板と、一対の圧電セラミックと、電極板と、電
気端子と、ナットと、締め付けボルトとから構成され、
共振周波数３５ｋＨｚ以上のランジュバン型ボルト締め
振動子において、前記裏打板は、その形状で厚みと直径
の寸法比がａである時、該裏打板のヤング率が４２０−
６５０×ａ（ＧＰａ）以上の材料を使用し、スプリアス
共振周波数を高くすることを特徴とするボルト締めラン
ジュバン型振動子が得られる。According to the present invention, there is provided a backing plate, a front plate, a pair of piezoelectric ceramics, an electrode plate, an electric terminal, a nut, and a tightening bolt.
In a Langevin type bolted oscillator having a resonance frequency of 35 kHz or more, when the backing plate has a shape and a dimensional ratio of thickness to diameter of a, the Young's modulus of the backing plate is 420-
A bolted Langevin-type vibrator characterized by using a material of 650 × a (GPa) or more and increasing the spurious resonance frequency can be obtained.
【０００７】[0007]
【作用】共振周波数３５ｋＨｚ以上のボルト締めランジ
ュバン型振動子において、周波数特性に影響を及ぼすも
のとして、圧電セラミック、裏打板、締め付けボルト等
が考えられる。In a bolted Langevin type vibrator having a resonance frequency of 35 kHz or more, piezoelectric ceramics, a backing plate, tightening bolts, etc. can be considered as factors that affect the frequency characteristics.
【０００８】ところで、裏打板は、中心に締め付けボル
トを通す穴が開いている。環状の形を形成するが、周波
数特性に影響を及ぼすのは、厚さと直径の比である。裏
打板が極端に薄くなったり、厚くなったりしては、周波
数特性が悪くなるので、厚さと直径の寸法比ａに対する
ヤング率の変化を実験して求めてグラフとしたのが、図
５である。By the way, the backing plate has a hole at the center through which a tightening bolt is inserted. Although forming an annular shape, it is the thickness-to-diameter ratio that affects the frequency characteristics. If the backing plate becomes extremely thin or thick, the frequency characteristics will deteriorate. Therefore, the change in the Young's modulus with respect to the dimensional ratio a of the thickness and the diameter was experimentally obtained and shown in FIG. is there.
【０００９】図５より、横軸にＡｌ及びＳＵＳ３０４の
厚さと直径の寸法比ａをとり、縦軸に、同様にＡｌ及び
ＳＵＳ３０４のヤング率をとると、ある直線式が得られ
た。その直線式は、ヤング率をＥとすると、Ｅ＝４２０
−６５０ａの一次関数である。共振周波数３５ｋＨｚ以
上のボルト締めランジュバン型振動子においては、周波
数特性をよくし、かつ、ボルトの締め付け、及び振動の
応力に対して、変形しない材料を選定するには、Ｅ＝４
２０−６５０ａを満たす、厚さと直径の寸法比ａに対し
て、あるヤング率を示す材料を選定する必要がある。例
えば、厚さが１７.５ｍｍ、直径が３５ｍｍの時、ａ＝
０.５となり、ヤング率は９５ＭＰａより高い材を選定
する必要がある。本発明は、ヤング率の高いＳＵＳ３０
４を選定し、裏打板に使用した結果、圧電セラミックの
破壊を防止し、振動子の特性のばらつきを小さくするこ
とができた。From FIG. 5, when a horizontal axis represents the dimensional ratio a of thickness and diameter of Al and SUS304 and a vertical axis similarly represents Young's modulus of Al and SUS304, a linear equation was obtained. The linear formula is E = 420, where Young's modulus is E
It is a linear function of -650a. For a bolted Langevin type oscillator having a resonance frequency of 35 kHz or more, in order to improve the frequency characteristics and select a material that does not deform with respect to bolt tightening and vibration stress, E = 4
It is necessary to select a material having a certain Young's modulus with respect to the dimensional ratio a of thickness and diameter that satisfies 20-650a. For example, when the thickness is 17.5 mm and the diameter is 35 mm, a =
It becomes 0.5, and it is necessary to select a material having a Young's modulus higher than 95 MPa. The present invention has a high Young's modulus of SUS30.
As a result of selecting No. 4 and using it for the backing plate, it was possible to prevent the destruction of the piezoelectric ceramic and reduce the variation in the characteristics of the vibrator.
【００１０】[0010]
【実施例】以下、本発明の実施例について、図面を用い
て説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１１】図１は、本発明に基づくボルト締めランジ
ュバン型振動子の縦断面図である。本発明のボルト締め
ランジュバン型振動子は、両面に電極を施し、分極した
環状のＰＺＴからなる圧電セラミック１，２と、電気端
子５と、電極板６と、前面板３及び裏打板４と、締め付
けボルト７と、ナット８の部品で構成されている。FIG. 1 is a longitudinal sectional view of a bolted Langevin type vibrator according to the present invention. The bolted Langevin type oscillator of the present invention has piezoelectric ceramics 1 and 2 made of polarized annular PZT having electrodes on both sides, electric terminals 5, an electrode plate 6, a front plate 3 and a backing plate 4, It is composed of a tightening bolt 7 and a nut 8.
【００１２】ボルト締めランジュバン型振動子の場合、
裏打板の歪み量（変形量）は、下記の数１で一般的に示
される。In the case of a bolted Langevin type vibrator,
The strain amount (deformation amount) of the backing plate is generally expressed by the following formula 1.
【００１３】[0013]
【数１】 [Equation 1]
【００１４】前記数１より、ヤング率が大きい程、歪み
量が小さくなることがわかる。From Equation 1 above, it can be seen that the larger the Young's modulus, the smaller the strain amount.
【００１５】裏打板４は、従来、アルミニウムを使用し
ていたが、表１に示すように、ヤング率が高い材質を選
定することによって、課題の目的を達成できるものと判
断した。Conventionally, aluminum has been used for the backing plate 4, but as shown in Table 1, it was judged that the object of the object could be achieved by selecting a material having a high Young's modulus.
【００１６】[0016]
【表１】 [Table 1]
【００１７】表１より、本発明の前面板３及び裏打板４
には、ステンレスのＳＵＳ３０４を使用した。Ｔｉは、
ヤング率が大きいが、材料としては脆く、加工しにくい
ので、裏打板として使用することは不利であったので、
用いなかった。その他、部品の材料、構成は、従来と同
じである。From Table 1, the front plate 3 and the backing plate 4 of the present invention are shown.
For this, stainless steel SUS304 was used. Ti is
Although it has a large Young's modulus, it is disadvantageous to use as a backing plate because it is brittle as a material and difficult to process.
Not used. Other than that, the materials and configurations of the parts are the same as the conventional ones.
【００１８】ここで、振動子の裏打板の厚さと直径の寸
法比ａが、本発明品と従来品とでは、同一のものを用い
ている。Here, the dimensional ratio a of the thickness and the diameter of the backing plate of the vibrator is the same in the present invention product and the conventional product.
【００１９】図２は、横軸に裏打板の半径をとり、縦軸
に裏打板の平面の歪み量をとり、図に示したものであ
る。図２では、裏打板の中心部と縁端部とのそりを示し
た。In FIG. 2, the horizontal axis represents the radius of the backing plate and the vertical axis represents the amount of strain in the plane of the backing plate. In FIG. 2, the warp between the center and the edge of the backing plate is shown.
【００２０】締め付けトルク、約１３００ｋｇ−ｆ・ｃ
ｍで締め付けた際、圧電セラミックに加わる応力は、図
２に示すように、ヤング率が小さいアルミニウムの裏打
板の平面の歪み量４１がＳＵＳ３０４の裏打板の平面の
歪み量４２より大きくなっていることがわかる。Tightening torque, about 1300 kg-f · c
When tightened at m, the stress applied to the piezoelectric ceramic is such that, as shown in FIG. 2, the strain amount 41 of the flat surface of the backing plate made of aluminum having a small Young's modulus is larger than the strain amount 42 of the flat surface of the backing plate of SUS304. I understand.
【００２１】共振周波数が３５ｋＨｚ以上のボルト締め
ランジュバン型振動子における、Ａｌ及びＳＵＳ３０４
の前記裏打板４の厚みと直径の寸法比ａに対して、圧力
分布を均一にするためのヤング率との関係を図５に示
す。即ち、図５は、裏打板の厚さと直径の寸法比ａとヤ
ング率Ｅの関係を示す図である。図５のＥ＝４２０−６
５０ａの式より、裏打板の圧電セラミック圧力分布を均
一にするためには、例えば、厚さと直径の寸法比ａが
０.４の時、ヤング率が１６０ＧＰａ以上、必要である
ことがわかる。なお、この式は、裏打板の中心部と外周
部の歪み量の差が３％以内となる範囲を限定している。
この際、３％は、ボルト締めランジュバン型振動子の性
能を出すために必要な歪み量の差である。Al and SUS304 in a bolted Langevin type oscillator having a resonance frequency of 35 kHz or more
FIG. 5 shows the relationship between the thickness and the dimensional ratio a of the diameter of the backing plate 4 and the Young's modulus for making the pressure distribution uniform. That is, FIG. 5 is a diagram showing the relationship between the dimensional ratio a of the thickness and diameter of the backing plate and the Young's modulus E. E = 420-6 in FIG.
From the equation of 50a, in order to make the piezoelectric ceramic pressure distribution of the backing plate uniform, for example, when the thickness-diameter ratio a is 0.4, the Young's modulus must be 160 GPa or more. It should be noted that this equation limits the range in which the difference in strain amount between the central portion and the outer peripheral portion of the backing plate is within 3%.
At this time, 3% is the difference in the amount of strain required to obtain the performance of the bolted Langevin type vibrator.
【００２２】以上より、図５を利用し、図５の領域Ａの
斜線部分の裏打板の材料を選定することにより、周波数
特性のばらつきが小さい、かつ、応力によって歪み、変
形しない圧電セラミックの破壊を生じない振動子を提供
できる。なお、本発明のボルト締めランジュバン型振動
子は、共振周波数が３５ｋＨｚ以上のものである。From the above, by using FIG. 5 and selecting the material of the backing plate in the shaded area in the area A of FIG. 5, the variation of the frequency characteristics is small, and the piezoelectric ceramic that is not distorted or deformed by stress is destroyed. It is possible to provide a vibrator that does not generate. The bolted Langevin type vibrator of the present invention has a resonance frequency of 35 kHz or higher.
【００２３】このことから、厚さと直径の寸法比ａを大
きくすることで、アルミニウムを使用した裏打板でも、
均一の応力を得ることができる。しかし、アルミニウム
の場合、この厚さと直径の寸法比ａを０.５３まで上げ
る必要があるため、基本周波数が大きく変わる欠点を有
する。Therefore, by increasing the dimensional ratio a of the thickness and the diameter, even with a backing plate using aluminum,
A uniform stress can be obtained. However, in the case of aluminum, it is necessary to raise the dimensional ratio a between the thickness and the diameter to 0.53, which has a drawback that the fundamental frequency changes greatly.
【００２４】前述したように、この均一な応力分布を得
ることによって、縦軸に共振インピーダンス、横軸に周
波数をとると、図４に示す周波数特性が得られる。As described above, by obtaining this uniform stress distribution, when the resonance impedance is plotted on the vertical axis and the frequency is plotted on the horizontal axis, the frequency characteristic shown in FIG. 4 is obtained.
【００２５】図３は、従来品の周波数特性である。FIG. 3 shows the frequency characteristics of the conventional product.
【００２６】ボルト締めランジュバン型振動子の周波数
特性の必要条件は、第１共振周波数特性が４０±１ｋ
Ｈｚであること、の条件の時、共振インピーダンス
が２０±１０Ωの値であることである。本発明のボルト
締めランジュバン型振動子は、上記の周波数特性を十分
に満足した。The necessary condition for the frequency characteristic of the bolted Langevin type vibrator is that the first resonance frequency characteristic is 40 ± 1 k.
The resonance impedance has a value of 20 ± 10 Ω under the condition of Hz. The bolted Langevin type vibrator of the present invention sufficiently satisfies the above frequency characteristics.
【００２７】ところで、図３のボルト締めランジュバン
型振動子では、第１共振周波数Ａ2点で縦振動が発生す
る。次に、第２共振周波数Ｂ2点で横振動（スプリアス
振動）が発生する。第１共振周波数Ａ2点と第２共振周
波数Ｂ2点の距離が小さい。このことは、第１共振周波
数特性に第２共振周波数特性が入るので、縦振動に横振
動が影響して、周波数特性が劣化することを意味してい
る。By the way, in the bolted Langevin type vibrator of FIG. 3, longitudinal vibration occurs at the first resonance frequency A 2 . Next, lateral vibration (spurious vibration) occurs at the second resonance frequency B 2 . The distance between the first resonance frequency A 2 point and the second resonance frequency B 2 point is small. This means that since the second resonance frequency characteristic is included in the first resonance frequency characteristic, the transverse vibration influences the longitudinal vibration and the frequency characteristic is deteriorated.
【００２８】図４では、第１共振周波数Ａ1点、第２共
振周波数Ｂ1点で振動が発生し、その距離、即ち、周波
数領域が、従来品より大きくなる。従って、縦振動に横
振動が影響する度合が小さくなり、周波数特性が劣化す
る度合が小さくなるので、周波数特性がよくなる。In FIG. 4, vibration occurs at the first resonance frequency A 1 point and the second resonance frequency B 1 point, and the distance, that is, the frequency region, becomes larger than that of the conventional product. Therefore, the degree to which the lateral vibration influences the longitudinal vibration is small, and the degree to which the frequency characteristic is deteriorated is small, so that the frequency characteristic is improved.
【００２９】本発明の周波数特性は、従来品の周波数特
性に比較して、スプリアス振動の横振動が高い周波数領
域に位置を変えているので、振動子の特性が向上するこ
とがわかる。It can be seen that the frequency characteristic of the present invention is improved in comparison with the frequency characteristic of the conventional product because the position is changed to a frequency region where the lateral vibration of spurious vibration is high.
【００３０】このように、本発明のボルト締めランジュ
バン型振動子によれば、振動子の縦振動に対して、他の
横振動からの影響が少なくなり、ばらつきが少ない振動
子が得られる。As described above, according to the bolted Langevin type vibrator of the present invention, the influence of other transverse vibrations on the longitudinal vibration of the vibrator is reduced, and a vibrator with less variation can be obtained.
【００３１】又、金属ブロックの圧電セラミックに対す
る応力分布が均一になることから、圧電セラミックの破
壊が、表２に見られるように少なくなった。Further, since the stress distribution of the metal block to the piezoelectric ceramic becomes uniform, the destruction of the piezoelectric ceramic is reduced as shown in Table 2.
【００３２】[0032]
【表２】 [Table 2]
【００３３】[0033]
【発明の効果】以上、示したように、本発明によれば、
裏打板の厚みと直径の寸法比に見合った材料を選ぶこと
により、応力分布が均一になり、同時に、スプリアスの
周波数特性の影響を小さくすることができ、かつ、セラ
ミックの破壊を防ぐことができ、高い信頼性を持つボル
ト締めランジュバン型振動子が得られる。As described above, according to the present invention,
By selecting a material that matches the dimensional ratio of the thickness and diameter of the backing plate, the stress distribution can be made uniform, and at the same time, the influence of spurious frequency characteristics can be reduced and ceramic destruction can be prevented. A highly reliable bolted Langevin type oscillator can be obtained.
【図１】本発明の実施例のボルト締めランジュバン型振
動子の縦断面図。FIG. 1 is a vertical sectional view of a bolted Langevin type vibrator according to an embodiment of the present invention.
【図２】本発明品及び従来品の裏打板の半径と裏打板の
平面の歪み量との関係を示す図。FIG. 2 is a diagram showing a relationship between a radius of a backing plate of the present invention product and a conventional product and a distortion amount of a plane of the backing plate.
【図３】従来のボルト締めランジュバン型振動子の周波
数特性を示す図。FIG. 3 is a diagram showing frequency characteristics of a conventional bolted Langevin type vibrator.
【図４】本発明のボルト締めランジュバン型振動子の周
波数特性を示す図。FIG. 4 is a diagram showing frequency characteristics of the bolted Langevin type vibrator of the present invention.
【図５】ボルト締めランジュバン型振動子の裏打板の厚
さと直径の寸法比とヤング率との関係を示す図。FIG. 5 is a diagram showing the relationship between the thickness-diameter dimensional ratio and Young's modulus of a backing plate of a bolted Langevin-type vibrator.
【図６】従来のボルト締めランジュバン型振動子の縦断
面図。FIG. 6 is a vertical cross-sectional view of a conventional bolted Langevin type vibrator.
１，２ 圧電セラミック ３ 前面板 ４ 裏打板 ５ 電極板 ６ 電気端子 ７ 締め付けボルト ８ ナット ９ 絶縁樹脂 ４１ アルミニウム ４２ ＳＵＳ３０４ Ａ 領域 Ａ1，Ａ2 第１共振周波数 Ｂ1，Ｂ2 第２共振周波数1, 2 Piezoelectric ceramic 3 Front plate 4 Backing plate 5 Electrode plate 6 Electric terminal 7 Tightening bolt 8 Nut 9 Insulating resin 41 Aluminum 42 SUS304 A Area A 1 , A 2 1st resonance frequency B 1 , B 2 2nd resonance frequency
Claims (1)
ックと、電極板と、電気端子と、ナットと、締め付けボ
ルトとから構成され、共振周波数３５ｋＨｚ以上のラン
ジュバン型ボルト締め振動子において、前記裏打板は、
その形状で厚みと直径の寸法比がａである時、該裏打板
のヤング率が４２０−６５０×ａ（ＧＰａ）以上の材料
を使用し、スプリアス共振周波数を高くすることを特徴
とするボルト締めランジュバン型振動子。1. A Langevin type bolting oscillator having a resonance frequency of 35 kHz or more, which comprises a backing plate, a front plate, a pair of piezoelectric ceramics, an electrode plate, an electric terminal, a nut, and a tightening bolt. The backing plate is
When the dimensional ratio of thickness to diameter is a in that shape, a material having a Young's modulus of the backing plate of 420-650 × a (GPa) or more is used to increase the spurious resonance frequency. Langevin type vibrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25931394A JPH0889893A (en) | 1994-09-28 | 1994-09-28 | Bolted langevin transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25931394A JPH0889893A (en) | 1994-09-28 | 1994-09-28 | Bolted langevin transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0889893A true JPH0889893A (en) | 1996-04-09 |
Family
ID=17332351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25931394A Pending JPH0889893A (en) | 1994-09-28 | 1994-09-28 | Bolted langevin transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0889893A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004000116A1 (en) | 2002-06-25 | 2003-12-31 | Ultrashape Inc. | Devices and methodologies useful in body aesthetics |
| US8454540B2 (en) | 2001-10-29 | 2013-06-04 | Yoram Eshel | Non-invasive ultrasonic body contouring |
| EP3689478A1 (en) | 2019-02-01 | 2020-08-05 | Honda Electronics Co., Ltd. | Bolt-tightening langevin-type transducer, ultrasonic measuring device |
-
1994
- 1994-09-28 JP JP25931394A patent/JPH0889893A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8454540B2 (en) | 2001-10-29 | 2013-06-04 | Yoram Eshel | Non-invasive ultrasonic body contouring |
| WO2004000116A1 (en) | 2002-06-25 | 2003-12-31 | Ultrashape Inc. | Devices and methodologies useful in body aesthetics |
| EP3689478A1 (en) | 2019-02-01 | 2020-08-05 | Honda Electronics Co., Ltd. | Bolt-tightening langevin-type transducer, ultrasonic measuring device |
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