JPS62217101A - Method for detecting reference mark position on printed circuit board - Google Patents

Method for detecting reference mark position on printed circuit board

Info

Publication number
JPS62217101A
JPS62217101A JP61059353A JP5935386A JPS62217101A JP S62217101 A JPS62217101 A JP S62217101A JP 61059353 A JP61059353 A JP 61059353A JP 5935386 A JP5935386 A JP 5935386A JP S62217101 A JPS62217101 A JP S62217101A
Authority
JP
Japan
Prior art keywords
reference mark
printed circuit
circuit board
frequency
eddy current
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
Application number
JP61059353A
Other languages
Japanese (ja)
Inventor
Teruhisa Nitta
新田 照久
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Japan Steel Works Ltd
Original Assignee
Japan Steel Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Japan Steel Works Ltd filed Critical Japan Steel Works Ltd
Priority to JP61059353A priority Critical patent/JPS62217101A/en
Publication of JPS62217101A publication Critical patent/JPS62217101A/en
Pending legal-status Critical Current

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  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

PURPOSE:To easily and accurately detect the center position of a reference mark on a metallic board of different kind by detecting the reference mark based on variation in the oscillation frequency of an eddy current type sensor. CONSTITUTION:A sensor coil 10 is moved above the printed circuit board 11 at specific distance in parallel to the printed circuit board. When the sensor coil 10 reaches the reference mark 36, the sensor coil 10 faces the reference mark 36 made of copper and the frequency increases by about 10% as compared with that when the coil passes over an iron plate 30. The oscillation frequency varies and a frequency-voltage converter 27 outputs a voltage proportional to the frequency, so that the input voltage to an arithmetic unit 29 rises. Consequently, the center value of the variation in output voltage, i.e. the center position of the reference mark 36 can be found.

Description

【発明の詳細な説明】 (イ)産業上の利用分野 本発明は、プリント基板の基準マーク位;δ検出ゴr 
:Ie F Fl!Iオフ 4 (rl”p s x−
(ロ)従来の技術 プリント基板の一種として、鉄板の上に絶縁用の薄いフ
ィルムを接着し、その上に銅はくのパターン及び基準マ
ークを設けたものがある。このようなプリント基板の基
準マーク中心位置を求める場合、従来はテレビカメラを
使用しその画像をデータ処理することにより基準マーク
の中心を求めていた。
DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention is directed to the reference mark position of a printed circuit board;
:Ie F Fl! I off 4 (rl”ps x-
(b) Conventional technology One type of printed circuit board is one in which a thin insulating film is glued onto a steel plate, and a copper foil pattern and reference marks are provided on the film. Conventionally, when determining the center position of a reference mark on such a printed circuit board, the center of the reference mark has been determined by using a television camera and data processing the image.

(ハ)発明が解決しようとする問題点 しかし、上記のようにテレビカメラを用いて基準マーク
位置を検出する方式には、価格が高くシステムが複雑で
あるという問題点があり、また基準マークの上に塗料が
設けられているような場合には位置の検出を行うことが
できないという問題点がある。本発明はこのような問題
点を解決することを目的としている。
(C) Problems to be Solved by the Invention However, the method of detecting the reference mark position using a television camera as described above has the problems of being expensive and having a complicated system. There is a problem in that the position cannot be detected if there is paint on the surface. The present invention aims to solve these problems.

(ニ)問題点を解決するだめの手段 本発明は、渦電流式センサーを用い、その発振周波数の
変化から基準マーク位置を検出することによりト記問題
市を解tkする。すなわち、本発明によるプリント基板
の基準マーク位置検出方法は、プリント基板の表面から
所定距l11tll!iれた位置を渦電流式センサーを
移動させ、渦電流式センサーが基準マーク上を通過する
際の発振周波数の変化に基づいて基準マーク位置を検出
することを要旨としている。
(d) Means for Solving the Problems The present invention solves the above problems by using an eddy current sensor and detecting the position of the reference mark from changes in its oscillation frequency. That is, the method for detecting the position of a reference mark on a printed circuit board according to the present invention detects a predetermined distance l11tll! from the surface of the printed circuit board. The gist of this method is to move an eddy current sensor to a position where the eddy current sensor passes over the reference mark, and to detect the reference mark position based on the change in oscillation frequency when the eddy current sensor passes over the reference mark.

(ホ)作用 例えば、鉄製の板上に銅の基準マークが設けられている
場合、渦電流式センサーが基準マーク以外の部分を移動
しているときには渦電流式センサーの発振周波数は鉄の
影響を受けた所定の周波数となっている。この状態から
渦電流式センサーが基準マーク上に達すると、渦電流式
センサーが銅と対面する状態となり発振周波数が変化す
る。
(E) Effect For example, if a copper reference mark is provided on a steel plate, and the eddy current sensor is moving in a part other than the reference mark, the oscillation frequency of the eddy current sensor will be affected by the iron. The received frequency is the predetermined frequency. When the eddy current sensor reaches the reference mark from this state, the eddy current sensor faces the copper and the oscillation frequency changes.

この発振周波数の変化を周波数−電圧変換することによ
り、渦電流式センサーが基準マーク上を通過し始める位
置、及び通過完了した位置を求めることができ、これに
基づいて基準マークの中心位置を算出することができる
。なお、渦電流式センサーが基準マーク上を通過する際
、電圧(又は電流)Fi動の振幅も変化するので、振幅
成分と周波数成分とを乗することにより、より明確に基
準マークの識別を行うようにすることもできる。
By frequency-to-voltage conversion of this change in oscillation frequency, it is possible to determine the position where the eddy current sensor starts passing over the reference mark and the position at which it completes passing over the reference mark.Based on this, the center position of the reference mark is calculated. can do. Note that when the eddy current sensor passes over the reference mark, the amplitude of the voltage (or current) Fi movement also changes, so by multiplying the amplitude component and the frequency component, the reference mark can be identified more clearly. You can also do it like this.

(へ)実施例 (第1実施例) 以下、本発明の第1実施例を添付図面の第1〜3図に基
づいて説明する。
(F) Embodiment (First Embodiment) Hereinafter, a first embodiment of the present invention will be described based on FIGS. 1 to 3 of the accompanying drawings.

渦電流式センサーであるセンサーコイル10は第1図に
示すような発振回路12(これはツェナーダイオード1
4、トランジスタ16、コンデンサ1B及び20、抵抗
22.24及び26から成る)と接続されており、出力
端子13から出力信号として電圧振動を得ることができ
る。出力端子13はバイパスフィルター52を介して周
波数−電圧変換器27と接続されており、周波数−電圧
変換?S27の出力は増幅器28に入力され、増幅器z
8によって増幅された出力信号が演算装置29に入力さ
れる。プリント基板11は、鉄板30と、この上に設け
られる例えばエポキシ樹脂などの絶縁用の薄いフィルム
32と、フィルム32上に設けられた銅はくのパターン
34及び基準マーク36とから構成されている。
The sensor coil 10, which is an eddy current sensor, has an oscillation circuit 12 (this is a Zener diode 1) as shown in FIG.
4, transistors 16, capacitors 1B and 20, and resistors 22, 24 and 26), and voltage oscillations can be obtained from the output terminal 13 as an output signal. The output terminal 13 is connected to a frequency-voltage converter 27 via a bypass filter 52, and performs frequency-voltage conversion? The output of S27 is input to amplifier 28, and amplifier z
The output signal amplified by 8 is input to the arithmetic unit 29. The printed circuit board 11 is composed of an iron plate 30, an insulating thin film 32 made of, for example, epoxy resin, provided on the iron plate 30, and a copper foil pattern 34 and a reference mark 36 provided on the film 32. .

基準マーク36の検出は次のようにして行われる。まず
、センサーコイル10をプリント基板11の上方所定距
離の位置でこれに平行に移動させる。センサーコイル1
0が基準マーク36上にないときにはセンサーコイル1
0の一端は鉄板30に対面していることになる。このと
き、出力端子13に出力される発振周波数は所定の値と
なっており、これに応じて演算装置29に人力される電
圧も所定の値となっている。センサーコイル10が基準
マーク36上に達すると、センサーコイル10はLM製
の基準マーク36に対面することになり、出力端子13
の発振周波数が変化する。後述の試験例に示すように、
鉄製の鉄板30上を通過する場合と比較して約10%周
波数が増大する。発振周波数が変化すると、周波数−電
圧変換器27によって周波数に比例した電圧が出力され
るため、演算装置29への入力端子載面↓+?1 畳、
イ ふ〜r4J−−Tノ、11八県−汁癩マーク36上
を通過する際に第2図に示すような出力電圧の変化が得
られることになる。これから出力電圧変化の中央値、す
なわち基準マーク36の中心位置(P)を求めることが
できる。
Detection of the reference mark 36 is performed as follows. First, the sensor coil 10 is moved parallel to the printed circuit board 11 at a position a predetermined distance above it. sensor coil 1
When 0 is not on the reference mark 36, the sensor coil 1
One end of 0 faces the iron plate 30. At this time, the oscillation frequency output to the output terminal 13 is a predetermined value, and correspondingly, the voltage manually applied to the arithmetic unit 29 is also a predetermined value. When the sensor coil 10 reaches the reference mark 36, the sensor coil 10 faces the reference mark 36 made of LM, and the output terminal 13
oscillation frequency changes. As shown in the test example below,
The frequency increases by about 10% compared to when the signal passes over an iron plate 30 made of iron. When the oscillation frequency changes, the frequency-voltage converter 27 outputs a voltage proportional to the frequency. 1 tatami,
When passing over the leprosy mark 36, a change in the output voltage as shown in FIG. 2 is obtained. From this, the median value of the output voltage change, that is, the center position (P) of the reference mark 36 can be determined.

上記のように、金属の種類が相違するとセンサーコイル
10の発振周波数が変化することを試験により確認した
結果を第3図に示す。この試験は、直径3.8mmのセ
ンサーヘッドに何も近接しない状態、銅を対面させた状
態、及び鉄を対面させた状態のそれぞれについて、コン
デンサー18及び20を交換して周波数を変化させたも
のである。この第3図から、センサーコイル10に金属
が近接していない状態と比較して鉄を近接させると振動
周波数が約5%減少し、逆に鋼を近接させると約5%増
大することがわかる。この相違から上述のようにして第
2図に示したような出力電圧の変化が得られ、基準マー
ク36の中心位置を検出することが可能となる。
As mentioned above, FIG. 3 shows the results of a test that confirmed that the oscillation frequency of the sensor coil 10 changes when the type of metal is different. In this test, the frequency was changed by replacing capacitors 18 and 20 with nothing in the vicinity of the 3.8 mm diameter sensor head, with copper facing the sensor head, and with iron facing the sensor head. It is. From FIG. 3, it can be seen that the vibration frequency decreases by approximately 5% when iron is placed close to the sensor coil 10, compared to the state where no metal is placed close to the sensor coil 10, and on the contrary, it increases by approximately 5% when steel is placed close to it. . As a result of this difference, a change in the output voltage as shown in FIG. 2 is obtained as described above, and it becomes possible to detect the center position of the reference mark 36.

(第2実b’ts例〉 γバ4殴1!、−太登叩の慎2↓旅例を示す7この笛2
実施例は、発振周波数の変化に電圧の振幅変化を組合せ
て基準マーク位置を検出するようにしたものである。す
なわち、バイパスフィルター52の出力を整流回路54
を通した後ローパスフィルター40によって電圧の振幅
成分を検出し、これに周波数−電圧変換器27からの信
号を掛算器42によって掛は合わせ、掛算器42の出力
信号の変化に基づいて基準マーク36の位置を検出する
ようにしたものである。センサーコイルIOとこれに近
接する金属との間の距離に応じて電圧の振幅が変化する
。鉄板30と基準マーク36とではセンサーコイル10
との距離が相違しているため、センサーコイルlOが基
準マーク36上を通過する際、電圧の振幅変化も発生す
る。
(2nd real b'ts example) γ-ba 4 hit 1!, - Taito hit no Shin 2 ↓ 7 showing the travel example 2 this flute
In the embodiment, the reference mark position is detected by combining a change in oscillation frequency with a change in voltage amplitude. That is, the output of the bypass filter 52 is transferred to the rectifier circuit 54.
After passing through the filter, the amplitude component of the voltage is detected by a low-pass filter 40, and this is multiplied by the signal from the frequency-voltage converter 27 by a multiplier 42. Based on the change in the output signal of the multiplier 42, the amplitude component of the voltage is detected by a reference mark 36. It is designed to detect the position of The amplitude of the voltage changes depending on the distance between the sensor coil IO and the metal close to it. The sensor coil 10 is connected to the iron plate 30 and the reference mark 36.
Since the distance between the reference mark 36 and the reference mark 36 is different, when the sensor coil IO passes over the reference mark 36, a change in the amplitude of the voltage also occurs.

従って、この電圧の振幅変化と111述の周波数変化と
を掛は合わせることにより、センサーコイル10が基準
マーク36上を通過する際の信号の変化が強調される。
Therefore, by multiplying this voltage amplitude change by the frequency change described in 111, the change in the signal when the sensor coil 10 passes over the reference mark 36 is emphasized.

従って、基準マーク36の中心位置をより確実に識別す
ることが可filとなる。
Therefore, it becomes possible to identify the center position of the reference mark 36 more reliably.

(ト)発明の詳細 な説明してきたように、本発明によると、渦電流式セン
サーの発振周波数の変化に基づいて異種金属板上の基準
マークを検出するようにしたので、基準マークの中心位
置を簡単にしかも正確に検出することが可能となる。
(G) As described in detail, according to the present invention, the reference mark on the dissimilar metal plate is detected based on the change in the oscillation frequency of the eddy current sensor. can be detected easily and accurately.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の第1実施例を示す図、第2図は出力電
圧の変化を示す図、第3図は渦電流式センサーの近接す
る金属による周波数変化を示す図、第4図は本発明の第
2実施例を示す図である。 10・・・渦電流式センサー(センサーコイル)、11
・・・プリント基板、12・・・発振回路、27・・・
周波数−電圧変換器、30・・・鉄板、32・・・フィ
ルム、36・・・基準マーク。
FIG. 1 is a diagram showing the first embodiment of the present invention, FIG. 2 is a diagram showing changes in output voltage, FIG. 3 is a diagram showing frequency changes due to adjacent metal of an eddy current sensor, and FIG. It is a figure which shows the 2nd Example of this invention. 10... Eddy current sensor (sensor coil), 11
...Printed circuit board, 12...Oscillation circuit, 27...
Frequency-voltage converter, 30... Iron plate, 32... Film, 36... Reference mark.

Claims (1)

【特許請求の範囲】 1、金属板上に絶縁フィルムを介して異なる金属の基準
マークが設けられているプリント基板の基準マーク位置
検出方法において、 プリント基板の表面から所定距離離れた位置を渦電流式
センサーを移動させ、渦電流式センサーが基準マーク上
を通過した際の発振周波数の変化に基づいて基準マーク
位置を検出することを特徴とするプリント基板の基準マ
ーク位置検出方法。 2、渦電流式センサーの発振周波数を周波数−電圧変換
し、これに振幅成分を乗算した信号により基準マーク位
置を検出する特許請求の範囲第1項記載のプリント基板
の基準マーク位置検出方法。
[Claims] 1. In a method for detecting the position of a reference mark on a printed circuit board in which reference marks of different metals are provided on a metal plate through an insulating film, a position a predetermined distance away from the surface of the printed circuit board is detected by eddy current. A method for detecting the position of a reference mark on a printed circuit board, the method comprising: moving an eddy current sensor and detecting the position of the reference mark based on a change in oscillation frequency when the eddy current sensor passes over the reference mark. 2. The method for detecting the position of a reference mark on a printed circuit board according to claim 1, wherein the position of the reference mark is detected by a signal obtained by performing frequency-voltage conversion on the oscillation frequency of the eddy current sensor and multiplying the oscillation frequency by an amplitude component.
JP61059353A 1986-03-19 1986-03-19 Method for detecting reference mark position on printed circuit board Pending JPS62217101A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61059353A JPS62217101A (en) 1986-03-19 1986-03-19 Method for detecting reference mark position on printed circuit board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61059353A JPS62217101A (en) 1986-03-19 1986-03-19 Method for detecting reference mark position on printed circuit board

Publications (1)

Publication Number Publication Date
JPS62217101A true JPS62217101A (en) 1987-09-24

Family

ID=13110824

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61059353A Pending JPS62217101A (en) 1986-03-19 1986-03-19 Method for detecting reference mark position on printed circuit board

Country Status (1)

Country Link
JP (1) JPS62217101A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008256693A (en) * 2007-03-30 2008-10-23 Cherry Gmbh Inductive damping element and inductive eddy-current-type operation element

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57103012A (en) * 1980-12-19 1982-06-26 Fujitsu Ltd Displacement detector
JPS60243501A (en) * 1984-05-18 1985-12-03 Japanese National Railways<Jnr> Eddy-current type point detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57103012A (en) * 1980-12-19 1982-06-26 Fujitsu Ltd Displacement detector
JPS60243501A (en) * 1984-05-18 1985-12-03 Japanese National Railways<Jnr> Eddy-current type point detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008256693A (en) * 2007-03-30 2008-10-23 Cherry Gmbh Inductive damping element and inductive eddy-current-type operation element

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