JPS6215477A - Ultrasonic position measuring instrument - Google Patents
Ultrasonic position measuring instrumentInfo
- Publication number
- JPS6215477A JPS6215477A JP15540285A JP15540285A JPS6215477A JP S6215477 A JPS6215477 A JP S6215477A JP 15540285 A JP15540285 A JP 15540285A JP 15540285 A JP15540285 A JP 15540285A JP S6215477 A JPS6215477 A JP S6215477A
- Authority
- JP
- Japan
- Prior art keywords
- ultrasonic
- measured
- circuit
- ultrasonic transducer
- position measuring
- 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
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、動電型スピーカのコーン紙面内に配置されて
いるノ・トメなどの微小な被測定物の位置を検出する超
音波位置計測装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an ultrasonic position measuring device for detecting the position of a minute object such as a toe placed within the cone surface of an electrodynamic speaker. It is something.
従来の技術
３ ・＼−
最近、超音波位置計測装置は工業用「フボノトなどの分
野で盛んに利用されるようになってきた。Conventional technology 3 ・＼- Recently, ultrasonic position measuring devices have been widely used in fields such as industrial "fubonoto".
この超音波位置計′６１１１装置としては、例えば精機
学会講演論文集（昭和５６年秋季大会５５〜５７頁）等
に記載されているように超音波送波器と超音波受波器を
回転させ、被測定物からの反射波レベルのピーク値によ
り被岨］定物表面の突起状物体の位置を測定するように
した構成が知られている。This ultrasonic position meter '6111 device rotates an ultrasonic transmitter and an ultrasonic receiver, as described in, for example, the Proceedings of the Japan Society of Precision Machinery Engineers (Autumn Conference of 1981, pp. 55-57). A configuration is known in which the position of a protruding object on the surface of an object to be measured is measured based on the peak value of the level of reflected waves from the object to be measured.
以下、第８図を参照して従来の超音波位置計側装置につ
いて説明する。第８図において、１旧は被測定物１０６
に超音波パルスを放射する円板状の超音波送波器、１．
０２は被測定物１０６の表面で反射された超音波パルス
を受波する円板状の超音波受波器、１０３は超音波送波
器１０１に送信パルスを印加するパルス発生回路、１０
４は超音波受波器１０２の出力を増幅する増幅器、］０
５はパルス発生回路［１３において発生ずるパルスのタ
イミングに同１ｔＪ］して反射波レベルに対応した増幅
器１０／Ｉの出力を記憶するメモリ・−である。Hereinafter, a conventional ultrasonic position measuring device will be explained with reference to FIG. In Fig. 8, 1 old is the object to be measured 106
a disc-shaped ultrasonic transmitter that emits ultrasonic pulses to the area; 1.
02 is a disk-shaped ultrasonic receiver that receives ultrasonic pulses reflected from the surface of the object to be measured 106; 103 is a pulse generation circuit that applies transmission pulses to the ultrasonic transmitter 101;
4 is an amplifier that amplifies the output of the ultrasonic receiver 102,]0
Reference numeral 5 denotes a memory for storing the output of the amplifier 10/I corresponding to the reflected wave level by the pulse generating circuit [1tJ at the same timing as the pulse generated in 13].
次にその動作について説明する。パルス発生回路１０３
より一定の時間間隔で超音波送波器１０１にパルスを印
加ｌ〜、超音波送波器１０１、あるいｄ、超音波送波器
１．０１及び超音波受波器１．０２をそれらの垂直軸１
．０］ａ、 Ｈ）２ａを回転軸として回転きせながら超
音波送波器１０１より被測定物１０６に超音波パルスを
放射する。このとき、被測定物１０６からの反射波レベ
ルは第９図に示すように超音波送波器］０１、超音波受
波器１０２の回転角が０°のときに極太を示し、回転角
が大きくなるにつれて次第に低下する。この反射波レベ
ルの極太は被測定物Ｊ０６の突起１（〕７からの反射に
」：るものであるので、反射波レベルが極大を示す超音
波送受波器１（）２の回転角の大きさから突起１０７の
位置を測定することができる。Next, its operation will be explained. Pulse generation circuit 103
Applying pulses to the ultrasonic transmitter 101 at more constant time intervals l~, the ultrasonic transmitter 101, or d, the ultrasonic transmitter 1.01 and the ultrasonic receiver 1.02. vertical axis 1
．． 0]a, H) Ultrasonic pulses are emitted from the ultrasonic transmitter 101 to the object to be measured 106 while rotating about the rotation axis 2a. At this time, as shown in FIG. 9, the reflected wave level from the object to be measured 106 is extremely thick when the rotation angle of the ultrasonic transmitter]01 and the ultrasonic receiver 102 is 0°; It gradually decreases as it gets bigger. This extremely thick reflected wave level is due to the reflection from the protrusion 1 () 7 of the object to be measured J06, so the rotation angle of the ultrasonic transducer 1 () 2 at which the reflected wave level is maximum is The position of the protrusion 107 can be measured from the outside.
なお、ここで用いられている超音波送波器１０１の周波
数は約１５０ＫＨ２である。Note that the frequency of the ultrasonic transmitter 101 used here is approximately 150KH2.
発明が解決しようとする問題点
しかし、以上のような従来の構成の超音波位置計測装置
を用いて第２図（σ）、（ｈ）に示す動電型スピーカ（
以下、単にスピーカと称す）のコーン紙１５ ベーン
の面内に位置する被測定物である・・トメ４の位置計測
を行なう場合、次のような問題点があった。Problems to be Solved by the Invention However, the electrodynamic speaker (σ) shown in FIGS.
When measuring the position of the toe 4, which is an object to be measured located within the plane of the cone paper 15 vane (hereinafter simply referred to as a speaker), the following problems occurred.
即ち、ハトメ４の大きさは高々直径１５ｍｒｎｚ長さ３
ｍｍ程度であり、従来の使用周波数１５０ＫＨｚにおけ
る超音波の波長２．３ｍｍに対し同程度であるため、・
・トメ４からの反射波レベルは極めて低く、Ｓ／Ｎ比を
十分に取ることができないため、超音波送波器１０１、
超音波受波器１０２を走査しても反射波レベルの変化が
緩やかとなり、極太位置を精度よく検出することが困難
であった。！た従来の超音波送波器１０１及び超音波受
波器】０２は円板状であり、集束されていないため、超
音波ビーム幅が広く、測定対象となる・・トメ４以外の
部分、例えば第２図（ｈ）に示すボイスコイルボビン２
の先端部２ａやフレーム３の端部からの反射波を受波す
るため、・・トメ４からの反射波を識別することができ
なかった。That is, the size of the eyelet 4 is at most 15 mrnz in diameter and 3 m in length.
mm, which is about the same as the wavelength of ultrasonic waves of 2.3 mm at the conventional frequency of 150 KHz.
- The level of the reflected wave from the tome 4 is extremely low and it is not possible to obtain a sufficient S/N ratio, so the ultrasonic transmitter 101,
Even when the ultrasonic wave receiver 102 scans, the reflected wave level changes slowly, making it difficult to accurately detect the extremely thick position. ! [Conventional ultrasonic transmitter 101 and ultrasonic receiver] 02 is disk-shaped and is not focused, so the ultrasonic beam width is wide and the measurement target is the part other than the tome 4, for example. Voice coil bobbin 2 shown in Fig. 2 (h)
Since the reflected waves from the tip 2a of the frame 3 and the end of the frame 3 are received, the reflected waves from the tome 4 could not be identified.
そこで、本発明は、従来技術の以上のような問題点を解
決するもので、ハトメなどの微小な被測定物の位置を精
度よく測定することができるよう６ ・＼−７
にした超音波位置計測装置を提供しようとするものであ
る。Therefore, the present invention solves the above-mentioned problems of the prior art, and has an ultrasonic position set to 6 ＼-7 so that the position of a minute object such as an eyelet can be accurately measured. The aim is to provide a measuring device.
問題点を解決するだめの手段
そして上記問題点を解決するだめの本発明の技術的な手
段は、超音波パルスの送受波を行なう超音波送受波器と
、この超音波送受波器を走査する走査装置と、上記超音
波送受波器に加える送信パルスを一定の時間間隔で発生
する送信回路と、」１記超音波送受波器の受信信号を増
幅する増幅回路と、この増幅回路により増幅した受信信
号の振幅をホールドするピークホールド回路と、このピ
ークホールド回路の出力をＡ／Ｄ変換するＡ／Ｄ変換回
路と、複数個の受信信号のうち振幅の最大となる送信パ
ルスの順序を検出し、被測定物の位置を演算する演算回
路とを具備したものである。Means for solving the problems and technical means of the present invention for solving the above problems include an ultrasonic transducer for transmitting and receiving ultrasonic pulses, and a scanning method for this ultrasonic transducer. a scanning device, a transmission circuit that generates transmission pulses to be applied to the ultrasonic transducer at regular time intervals, an amplifier circuit that amplifies the received signal of the ultrasonic transducer described in 1. A peak hold circuit that holds the amplitude of the received signal, an A/D conversion circuit that A/D converts the output of this peak hold circuit, and a detecting order of the transmitted pulses having the maximum amplitude among the plurality of received signals. , and an arithmetic circuit that calculates the position of the object to be measured.
作用 」＝記技術的手段による作用は次のようになる。action ” = The effect of the technical means is as follows.
即ち、超音波送受波器により等速走査し、この間に送信
回路より一定の時間間隔で送信パルスを超音波送受波器
に印加する。これにより超音波送受７、−３−７
波器より超音波パルスを放射し、被測定物から反射され
、超音波送受波器によって受波された受信信号を増幅回
路により増幅する。この受信信号を検波平滑回路で検波
平滑し、この受信信号の最大振幅を１回の送信パルスご
とにピークホールド回路にホールドする。Ａ／Ｄ変換回
路によってＡ／Ｄ変換された受信信号の最大振幅は演算
回路により１回の送信パルスごとにメモリに格納した後
、１回の走査における最大値を検出し、その結果から被
測定物の位置の演算を行なう。従って・刈・メのような
微小寸法の被測定物の位置を高精度に計測することがで
きる。That is, the ultrasonic transducer performs constant speed scanning, and during this period, the transmitting circuit applies transmission pulses to the ultrasonic transducer at regular time intervals. As a result, an ultrasonic pulse is emitted from the ultrasonic transducer 7, -3-7, and the received signal reflected from the object to be measured and received by the ultrasonic transducer is amplified by the amplifier circuit. This received signal is detected and smoothed by a detection smoothing circuit, and the maximum amplitude of this received signal is held in a peak hold circuit for each transmission pulse. The maximum amplitude of the received signal that has been A/D converted by the A/D conversion circuit is stored in the memory for each transmission pulse by the arithmetic circuit, and then the maximum amplitude in one scan is detected, and the maximum amplitude of the received signal is determined based on the result. Perform calculations on the position of objects. Therefore, it is possible to measure the position of a very small object to be measured, such as a cutter, with high precision.
実施例
以下、図面を参照しながら本発明の実施例について説明
する。第１図は本発明の第１実施例における超音波位置
計測装置を示すブロック回路図、第２図はスピーカのハ
トメを被測定物として測定する場合のスピーカに対する
超音波送受波器の配置を示し、第２図（ａ）は要部の平
面図、第２図（ｈ）は要部の一部切欠正面図である。先
ず、スピーカについて説明すると、１はコーン紙、２は
ボイスコイルボビン、３はフレーム、４はコーン紙１の
面内に位置する・・トメである。次に超音波位置計測装
置について説明すると、第１図においで、１１は超音波
送受波器で、曲面型振動子を有し、走査装置（図示省略
）により第２図（ａ）に示すようにコーン紙１の中心点
０を中心として・・トメ４を通る半径Ｒの円弧Ａ上で矢
印Ｂ方向にＳ。からＳｌまでの角度２θ０の範囲で走査
される。１２は超音波送受波器Ｊ１に一定の時間間隔で
送信パルスを印加する送信回路、Ｊ３は超音波送受波器
１１より放射された超音波パルスがコーン紙］、あるい
はハトメ４から反射され、超音波送受波器１１によって
受波された受信信号を増幅する増幅回路、１４は受信信
号の検波平滑回路、１５は検波平滑回路１４で検波平滑
された受信信号の最大振幅を１回の送信パルスごとにホ
ールドするピークホールド回路、】６は受信信号をＡ／
Ｄ （アナログ−ディジタル）変換するＡ／Ｄ変換回路
、１７はＡ／Ｄ変換回路１６によってＡ／Ｄ変換された
受信信号９１＝−：・
の最大振幅を１回の送信パルスごとにメモリに格納した
後、１回の走査第２図（ａ）のＳ。からＳｌまでにおけ
る最大値を検出し、その結果からハトメ４位置の演算を
行なう演算回路である。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a block circuit diagram showing an ultrasonic position measuring device according to a first embodiment of the present invention, and Fig. 2 shows the arrangement of an ultrasonic transducer with respect to a speaker when measuring an eyelet of a speaker as an object to be measured. , FIG. 2(a) is a plan view of the main part, and FIG. 2(h) is a partially cutaway front view of the main part. First, to explain the speaker, 1 is a paper cone, 2 is a voice coil bobbin, 3 is a frame, and 4 is a tome located within the plane of the paper cone 1. Next, to explain the ultrasonic position measuring device, in Fig. 1, reference numeral 11 is an ultrasonic transducer, which has a curved transducer. Centering on the center point 0 of the paper cone 1... S in the direction of arrow B on the arc A of radius R passing through the toe 4. The range of angle 2θ0 from S1 to S1 is scanned. 12 is a transmission circuit that applies transmission pulses to the ultrasonic transducer J1 at regular time intervals; J3 is a transmission circuit that applies transmission pulses to the ultrasonic transducer J1 at regular intervals; An amplifier circuit for amplifying the received signal received by the acoustic wave transducer 11, 14 a detection and smoothing circuit for the received signal, and 15 the maximum amplitude of the received signal detected and smoothed by the detection and smoothing circuit 14 for each transmission pulse. ]6 is a peak hold circuit that holds the received signal at A/
D (analog-digital) A/D conversion circuit 17 stores the maximum amplitude of the received signal 91=-:・ A/D converted by the A/D conversion circuit 16 in memory for each transmission pulse. After that, one scan S in Fig. 2(a). This is an arithmetic circuit that detects the maximum value from S1 to S1, and calculates the four eyelet positions from the result.
次に上記実施例の動作について説明する。超音波送受波
器１】により円弧Ａ上をＳ。からＳ、までの角度２θ。Next, the operation of the above embodiment will be explained. S on arc A using ultrasonic transducer 1]. The angle 2θ from to S.
の範囲で等速走査し、この間に送信口、路１２より一定
の時間間隔で送信パルスを超音波送受波器１１に印加す
る。これにより超音波送受波器】】より超音波パルスを
放射し、コーン紙ｌ、あるいはハトメ４から反射され、
超音波送受波器１１によって受波された受信信号を増幅
回路１３により増幅する。この受信信号を検波平滑回路
１４で検波平滑し、この受信信号の最大振幅を１回のは
演算回路１７により１回の送信パルスごとにメモリに格
納した後、１回の走査における最大値を検出し、その結
果から・・トメ４の位置の演算を行なう。During this period, transmission pulses are applied to the ultrasonic transducer 11 from the transmission port 12 at regular time intervals. As a result, ultrasonic pulses are emitted from the ultrasonic transducer] and are reflected from the cone paper l or eyelet 4,
A reception signal received by the ultrasonic transducer 11 is amplified by an amplifier circuit 13. This received signal is detected and smoothed by the detection smoothing circuit 14, and the maximum amplitude of this received signal is stored in memory for each transmitted pulse by the arithmetic circuit 17, and then the maximum value in one scan is detected. Then, from the result, the position of tome 4 is calculated.
１０ へ−
今、超音波送受波器１１は周波数ＩＭＨ２，曲率半径３
０ｍｍｚ直径１． （ｌ ｍｍの凹面形振動子を有して
いるとすると、焦点位置における超音波ビームのビーム
幅（直径）２ｂは下記の（１）式により得ることができ
る。10 - Now, the ultrasonic transducer 11 has a frequency of IMH2 and a radius of curvature of 3.
0mmz diameter 1. (Assuming that it has a concave transducer of 1 mm, the beam width (diameter) 2b of the ultrasonic beam at the focal position can be obtained from the following equation (1).
２ｈ−２λＺ／（πα） ・・・・・・（１
＞λ：波長
Ｚ：焦点距離
ａ：凹面振動子の半径
従って本実施例において、焦点位置における超音波ビー
ム幅２ｈは約］、、 ３ ｍｍであり、ノ・トメ４の寸
法とほぼ同程度となる。そして上記超音波送受波器１１
はノ・トメ４に対向するときの距離ｄがほぼ凹面の曲率
半径に一致する高さで、円弧Ａ上をＳｏからＳ、−１で
の角度２θ０範囲で等速走査し、この間に一定の時間間
隔で送信回路１２により２回０回の送信パルスを超音波
送受波器１１に印加するものとする。これによりＳ。か
らＳ、の走査期間における反射波レベルは第３図に示す
ようになる。2h−2λZ/(πα) ・・・・・・(1
>λ: Wavelength Z: Focal length a: Radius of concave transducer Therefore, in this example, the ultrasonic beam width 2h at the focal position is approximately 3 mm, which is approximately the same as the size of the hole 4. Become. and the ultrasonic transducer 11
At a height where the distance d when facing the tome 4 almost matches the radius of curvature of the concave surface, the arc A is scanned at a constant speed in the angle 2θ0 range from So to S, -1, and during this period, a constant It is assumed that the transmission circuit 12 applies two and zero transmission pulses to the ultrasonic transducer 11 at time intervals. This allows S. The reflected wave level during the scanning period from S to S is as shown in FIG.
即ち、コーン紙ｌと超音波送受波器１１の中心軸１１
・・ 。That is, the central axis 11 of the cone paper l and the ultrasonic transducer 11
・・・ .
ばかなり大きな傾斜角をなしているためコーン紙ｌから
の反射波は超音波送受波器１１に殆んど受波されず、極
めて低いものであり、ハトメ４の位置を通過するＰ点で
反射波レベルはピークとなる。Since the angle of inclination is quite large, the reflected wave from the cone paper l is hardly received by the ultrasonic transducer 11 and is extremely low, and is reflected at point P passing through the position of the eyelet 4. The wave level is at its peak.
従ってコーン紙１の中心点Ｏを原点（０，０）とし、ハ
トメ４の位置Ｐ点の座標をｘＸ ｙとしたとき、反射レ
ベルのピークがＮ番目の送信パルスに現われるものとす
ると１．ｚ’、 ｙは次式で与えられる。Therefore, if the center point O of the paper cone 1 is the origin (0,0) and the coordinates of the position P of the eyelet 4 are xXy, and the peak of the reflection level appears at the Nth transmitted pulse, then 1. z' and y are given by the following equations.
Ｎは反射波レベルの測定結果から得られる値であり、Ｎ
ＯＮａ３及びＲは定数として予め演算回路１７にストア
しておくことによって（２）式のｘＸ ｙを演算回路】
７で演算し、ハトメ４の位置を求めることができる。N is the value obtained from the measurement results of the reflected wave level, and N
By storing ONa3 and R as constants in the arithmetic circuit 17 in advance, xX y in equation (2) can be calculated by the arithmetic circuit]
7 to find the position of the eyelet 4.
このように本実施例によれば、超音波ビーム径がハトメ
４の位置においてハトメ４の寸法とほぼ等しい凹面型振
動子を有する超音波送受波器１１を使用し、その凹面の
焦点距離にほぼ等しい距離だけ離してハトメ４を含む円
の上方を走査しているため、ハトメ４の位置においてン
ヤープな反射波レベルのピークが現われるので、高精度
で７・トメ４の位置計測を行なうことができる。As described above, according to the present embodiment, the ultrasonic transducer 11 having a concave transducer whose ultrasonic beam diameter is approximately equal to the size of the eyelet 4 at the position of the eyelet 4 is used, and the focal length of the concave surface is approximately equal to the diameter of the eyelet 4. Since the upper part of the circle including eyelet 4 is scanned at an equal distance apart, a peak of the reflected wave level appears at the position of eyelet 4, so the position of eyelet 7 and eyelet 4 can be measured with high accuracy. .
次に本発明の第２実施例における超音波位置計測装置に
ついて説明する。第４図は本発明の第２実施例のブロッ
ク回路図、第５図はスピーカに対する超音波送受波器の
配置を示し、第５図（ａ）は要部の平面図、第５図（勾
は要部の一部切欠正面図である。本実施例にあって、上
記第１実施例の構成と異なる点は第５図（’７．）、（
ｈ）に示すように超音波送受波器１】が・・トメ４を見
込む一定の角度をもってコーン紙】の中心点Ｏを中心と
する半径Ｒｓ （Ｒ。Next, an ultrasonic position measuring device according to a second embodiment of the present invention will be described. FIG. 4 is a block circuit diagram of the second embodiment of the present invention, FIG. 5 shows the arrangement of the ultrasonic transducer with respect to the speaker, FIG. 5(a) is a plan view of the main part, and FIG. is a partially cutaway front view of the main part.The difference in the configuration of this embodiment from the above-mentioned first embodiment is shown in FIG. 5 ('7.), (
As shown in h), the ultrasonic transducer 1] is held at a certain angle looking toward the toe 4 with a radius Rs (R) centered on the center point O of the cone paper].
＞Ｒ）の円弧Ａ上で矢印Ｂ方向にＳ。からＳ１１での角
度２θ。の範囲で走査するようにし、寸だ送信回路１２
の送信パルスから一定の遅延時間を持って、即ち、ハト
メ４からの反射波を受信した後、・・トメ以外からの反
射波を受信する寸での期間にＡ／Ｄ変換回路Ｊ６がＡ／
Ｄ変換をスタートする１３Ｓ−／゛
ように制御するだめのパルスを与える遅延パルス発生回
路Ｉを備えた構成にある。>R) on arc A in the direction of arrow B. Angle 2θ at S11 from . The transmission circuit 12 scans within the range of
After a certain delay time from the transmitted pulse, that is, after receiving the reflected wave from the eyelet 4, the A/D converter circuit J6 converts the
The configuration includes a delay pulse generation circuit I that provides a pulse for controlling 13S-/' to start D conversion.
以下、」１記第２実施例の動作について説明する。Hereinafter, the operation of the second embodiment described in section 1 will be explained.
上記第１実施例と同様に超音波送受波器Ｊ１は半径Ｒｓ
なる円弧Ａの上方をＳ。からＳ、まで角度２θ０の範囲
で等速走査し、その間に送信回路１２より一定の時間間
隔で２Ｎｏ回の送信パルスを送信するものとする。この
とき、超音波送受波器Ｊ１は斜め上方からコーン紙１の
中央部を見込むように配置されているため、ボイスコイ
ルボビン２の上端部２ａが超音波ビームの内に入り、レ
ベルの高い反射波を生ずる場合がある。従って超音波送
受波器１１がハトメ４を見込む位置に走査されたとき、
第６図に示すようにノ・トメ４からの反射波Ｃに対して
時間遅れＴｄを持ってボイスコイルボビン２の上端部２
ａからの反射波りが生じる。この時間遅れはハトメ４と
ボイスコイルボビン上端部２ａとの距離差に相当する。As in the first embodiment, the ultrasonic transducer J1 has a radius Rs
The upper part of the arc A is S. It is assumed that constant speed scanning is performed in the range of angle 2θ0 from S to S, and during that period, the transmission circuit 12 transmits 2No transmission pulses at regular time intervals. At this time, since the ultrasonic transducer J1 is arranged to look at the center of the paper cone 1 from diagonally above, the upper end 2a of the voice coil bobbin 2 enters the ultrasonic beam, causing a high-level reflected wave. may occur. Therefore, when the ultrasonic transducer 11 is scanned to a position where the eyelet 4 is expected,
As shown in FIG. 6, the upper end 2 of the voice coil bobbin 2
A reflected wave is generated from a. This time delay corresponds to the distance difference between the eyelet 4 and the voice coil bobbin upper end 2a.
反射波りは・・トメ４の位置計測には不要な反射波であ
り、誤差の原因となる力；、遅延パルス発生回路１８に
よって、反射波Ｃ１４・、−
を受波し、反射波りを受波する以前にＡ／Ｄ変換回路１
６にＡ／Ｄ変換スタートさせるだめのパルスを発生さぜ
るので、Ａ／Ｄ変換された値はＡ／Ｄ変換回路１６の出
力ポートにラッチされる。従ってＡ／Ｄ変換回路１６の
出力は・・トメ４からの反射波Ｃの振幅に対応した値と
なり、ボイスコイルボビン２の上端部２ａからの反射波
りを除外することができ、・・トメ４の位置測定の誤差
を軽減することができる。本実施例において、ハトメ４
の座標（−ｒｓｙ）は第７図から明らかなように次式で
与えられる。The reflected wave is a reflected wave that is unnecessary for the position measurement of the tome 4 and causes an error.The delayed pulse generation circuit 18 receives the reflected wave C14, - and generates the reflected wave. A/D conversion circuit 1 before receiving the wave
6, a pulse is generated to start the A/D conversion, so the A/D converted value is latched at the output port of the A/D conversion circuit 16. Therefore, the output of the A/D conversion circuit 16 is a value corresponding to the amplitude of the reflected wave C from the tome 4, and the reflected wave from the upper end 2a of the voice coil bobbin 2 can be excluded. position measurement errors can be reduced. In this example, eyelet 4
As is clear from FIG. 7, the coordinates (-rsy) of is given by the following equation.
従ってＲ，Ｒ８、Ｎｏ１θ。の値を予め演算回路１７に
ストアしておくことによって、反射波レベルの測定結果
からＮを求め、（３）式を用いてｘｌ ｙの値を演算回
路１７で演算し、・・トメ４の位置を求めるときができ
る。Therefore, R, R8, No1θ. By storing the values of in the arithmetic circuit 17 in advance, N is calculated from the measurement results of the reflected wave level, and the values of xl and y are calculated in the arithmetic circuit 17 using equation (3). It is possible to find the position.
なお、上記第１、第２実施例においては超音波送受波器
１１の走査を円弧状に行なうようにしたが、直線状に走
査する場合も全く同様である。寸外超音波送受波器１１
の走査速度は全走査幅にわたって等速走査になると仮定
して説明しているが、走査幅の始点Ｓ。、終点Ｓ１の近
傍では、低速になる場合があるので、この時は走査幅を
Ｓ。、８１間より広く両側に走査１〜、送信パルスをＳ
。からＳ、の区間だけで超音波送受波器１Ｊに印加する
」：うに設定すれば走査速度の低下による１１１１］定
誤差を小さくすることができる。更に凹面型振動子に代
えて平板型振動子を用でも位置測定の精度はやや低下す
るが、従来に比べて高精度に位置測定を行なうことがで
きる。In the first and second embodiments described above, the ultrasonic transducer 11 scans in an arc shape, but the same applies to the case where it scans in a straight line. Ultrasonic transducer 11
The explanation is based on the assumption that the scanning speed is constant over the entire scanning width, but the starting point S of the scanning width. , near the end point S1, the speed may be slow, so at this time the scanning width is set to S. , scan on both sides wider than 1 to 81, send pulse S
. If the setting is made as follows, it is possible to reduce the constant error caused by the decrease in scanning speed. Furthermore, even if a flat plate type vibrator is used in place of the concave type vibrator, the accuracy of position measurement is slightly lowered, but position measurement can be performed with higher precision than in the past.
発明の効果
以上のように本発明によれば、超音波送受波器の走査期
間中に一定の時間間隔で超音波パルスを発信し、その反
射波レベルが最大となる発信パルスの順序から被測定物
の位置を演算回路により演算するので、ハトメのような
微小寸法の被測定物の位置を高精度に計測することがで
きる。Effects of the Invention As described above, according to the present invention, ultrasonic pulses are emitted at regular intervals during the scanning period of an ultrasonic transducer, and the measurement target is determined in the order of the emitted pulses that have the highest reflected wave level. Since the position of the object is calculated by the arithmetic circuit, the position of a minute object to be measured, such as an eyelet, can be measured with high precision.
第１図及び第２図は本発明の第１実施例における超音波
位置計測装置を示し、第１図はブロック回路図、第２図
（ａ）はスピーカに対する超音波送受波器の配置を示す
平面図、同図（ｈ）はその一部切欠正面図、第３図は走
査方向に対する反射波レベルの一例を示す特性図、第４
図及び第５図は本発明の第２実施例における超音波位置
計測装置を示し、第４図はブロック回路図、第５図（ａ
）はスピーカに対する超音波送受波器の配置を示す平面
図、同図（Ａ）はその一部切欠正面図、第６図は反射波
の説明図、第７図は被測定物の位置計算式の説明図、第
８図は従来の超音波位置計測装置のブロック図、第９図
はその反射波レベルの一例を示す特性図である。
］１・・・超音波送受波器、１２・・・送信回路、Ｊ３
・・・増幅回路、１５・・・ピークホールド回路、１６
・・・Ａ／Ｄ変換回路、Ｊ７・・・演算回路。1 and 2 show an ultrasonic position measuring device according to a first embodiment of the present invention, FIG. 1 is a block circuit diagram, and FIG. 2 (a) shows the arrangement of an ultrasonic transducer with respect to a speaker. FIG. 3 is a characteristic diagram showing an example of the level of reflected waves in the scanning direction, FIG.
5 and 5 show an ultrasonic position measuring device according to a second embodiment of the present invention, FIG. 4 is a block circuit diagram, and FIG.
) is a plan view showing the arrangement of the ultrasonic transducer with respect to the speaker, (A) is a partially cutaway front view, Fig. 6 is an explanatory diagram of reflected waves, and Fig. 7 is a formula for calculating the position of the object to be measured. FIG. 8 is a block diagram of a conventional ultrasonic position measuring device, and FIG. 9 is a characteristic diagram showing an example of the reflected wave level. ] 1... Ultrasonic transducer, 12... Transmission circuit, J3
...Amplification circuit, 15...Peak hold circuit, 16
... A/D conversion circuit, J7... arithmetic circuit.
Claims (5)
、この超音波送受波器を走査する走査装置と、上記超音
波送受波器に加える送信パルスを一定の時間間隔で発生
する送信回路と、上記超音波送受波器の受信信号を増幅
する増幅回路と、この増幅回路により増幅した受信信号
の振幅をホールドするピークホールド回路と、このピー
クホールド回路の出力をＡ／Ｄ変換するＡ／Ｄ変換回路
と、複数個の受信信号のうち振幅の最大となる送信パル
スの順序を検出し、被測定物の位置を演算する演算回路
とを具備したことを特徴とする超音波位置計測装置。(1) An ultrasonic transducer that transmits and receives ultrasonic pulses, a scanning device that scans this ultrasonic transducer, and a transmitter that generates transmission pulses to be applied to the ultrasonic transducer at regular time intervals. an amplifier circuit that amplifies the received signal of the ultrasonic transducer, a peak hold circuit that holds the amplitude of the received signal amplified by the amplifier circuit, and an A/D converter that converts the output of the peak hold circuit. An ultrasonic position measuring device comprising: a /D conversion circuit; and an arithmetic circuit that detects the order of transmitted pulses having the maximum amplitude among a plurality of received signals and calculates the position of an object to be measured. .
波送受波器を被測定物に対し上記凹面の曲率半径にほぼ
等しい距離を存して走査する特許請求の範囲第１項記載
の超音波位置計測装置。(2) The ultrasonic transducer has a concave vibrator, and the ultrasonic transducer scans the object to be measured at a distance approximately equal to the radius of curvature of the concave surface. The ultrasonic position measuring device described in .
において被測定物の寸法とほぼ同程度である特許請求の
範囲第２項記載の超音波位置計測装置。(3) The ultrasonic position measuring device according to claim 2, wherein the beam width of the concave transducer is approximately the same as the dimension of the object to be measured at the beam position of the object to be measured.
対し傾斜された状態で超音波送受波器が被測定物に対向
するように配置された特許請求の範囲第１項乃至第３項
のいずれかに記載の超音波位置計測装置。(4) Claims 1 to 4, wherein the ultrasonic transducer is arranged so as to face the object to be measured with the central axis of the ultrasonic transducer being inclined with respect to the plane containing the object to be measured. The ultrasonic position measuring device according to any one of Item 3.
た後、被測定物以外からの反射波を受信する前までの期
間にＡ／Ｄ変換をスタートするように制御される特許請
求の範囲第１項記載の超音波位置計測装置。(5) A patent in which the A/D conversion circuit is controlled to start A/D conversion during the period after receiving the reflected wave from the object to be measured and before receiving the reflected wave from other than the object to be measured. An ultrasonic position measuring device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15540285A JPS6215477A (en) | 1985-07-15 | 1985-07-15 | Ultrasonic position measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15540285A JPS6215477A (en) | 1985-07-15 | 1985-07-15 | Ultrasonic position measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6215477A true JPS6215477A (en) | 1987-01-23 |
Family
ID=15605184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15540285A Pending JPS6215477A (en) | 1985-07-15 | 1985-07-15 | Ultrasonic position measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6215477A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2103639A1 (en) * | 1994-05-31 | 1997-09-16 | Consejo Superior Investigacion | Procedure for recognizing and determining the position of objects. |
-
1985
- 1985-07-15 JP JP15540285A patent/JPS6215477A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2103639A1 (en) * | 1994-05-31 | 1997-09-16 | Consejo Superior Investigacion | Procedure for recognizing and determining the position of objects. |
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