JPS5828619B2 - magnetic field generator - Google Patents
magnetic field generatorInfo
- Publication number
- JPS5828619B2 JPS5828619B2 JP55049478A JP4947880A JPS5828619B2 JP S5828619 B2 JPS5828619 B2 JP S5828619B2 JP 55049478 A JP55049478 A JP 55049478A JP 4947880 A JP4947880 A JP 4947880A JP S5828619 B2 JPS5828619 B2 JP S5828619B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- field generating
- coil
- coils
- phase difference
- 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
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/047—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using sets of wires, e.g. crossed wires
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
Description
【発明の詳細な説明】
本発明は磁界発生装置に関し、特に座標読取装置におけ
る位置検出に使用する交流磁界を発生するための磁界発
生装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic field generating device, and more particularly to a magnetic field generating device for generating an alternating magnetic field used for position detection in a coordinate reading device.
従来、座標読取装置は平面板上に置かれた位置発生器よ
り発生する信号を該平面板上内に配置された検出コイル
の如き多数の検出器により検出し、その出力振幅の大小
関係、あるいは位相関係より、その平面板上における位
置発生器の座標を読みとるように構成されている。Conventionally, coordinate reading devices detect signals generated by a position generator placed on a flat plate using a number of detectors such as detection coils placed on the flat plate, and determine the magnitude relationship of the output amplitude or It is configured to read the coordinates of the position generator on the plane plate based on the phase relationship.
この方式によれば平面板内に細かく配置された検出器の
数によりその精度が決定されてしまうので、精度を向上
させるためには多数の検出器を必要とするという問題点
が存在する。According to this method, the accuracy is determined by the number of detectors arranged finely within the flat plate, so there is a problem in that a large number of detectors are required to improve the accuracy.
したがって本件特許出願人はこの問題点を改善するため
に、第１図に示す如き位相差検出方式の座標読取装置を
提案した。Therefore, in order to improve this problem, the applicant of the present patent proposed a phase difference detection type coordinate reading device as shown in FIG.
この座標読取装置では交流磁界発生器１の上部に平面板
２を配置するとともに、この交流磁界発生器１の内部に
磁界発生用コイル３−１ 、３−２ 、３−３・・・・
・・・・・と、磁界発生用コイル４−１ 、４−２ 、
４−３・・・・・・・・・を設ける。In this coordinate reading device, a flat plate 2 is placed above an AC magnetic field generator 1, and magnetic field generating coils 3-1, 3-2, 3-3...
...and magnetic field generating coils 4-1, 4-2,
4-3...... will be provided.
そして、磁界発生用コイル３−１．３−２゜３−３にそ
れぞれ位相の異なる電圧を発生する交流電源５−１ 、
５−２ 、５−３・・・・・・・・・を接続する。and an AC power source 5-1 that generates voltages with different phases to the magnetic field generating coils 3-1, 3-2 and 3-3, respectively;
Connect 5-2, 5-3...
同様に磁界発生用コイル４−１ 、４−２ 、４−３・
・・・・・・・・にも、それぞれ位相の異なる電圧を発
生する交流電源６−１ 、６−２ 、６−３・・・・・
・・・・を接続する。Similarly, magnetic field generating coils 4-1, 4-2, 4-3,
. . . also have AC power supplies 6-1, 6-2, 6-3, which generate voltages with different phases, respectively.
Connect...
該電源５−１ 、５−２ 、５−３・・・・・・・・・
、６−１゜６−２ 、６−３・・・・・・・・・はＸ軸
切換信号によって出力電圧をＯＮ１０ Ｆ Ｆする。The power supplies 5-1, 5-2, 5-3...
, 6-1, 6-2, 6-3, . . . turn their output voltages ON10 F F according to the X-axis switching signal.
Ｘ／Ｙ軸切輪切軸信号軸に指定した場合には電源５−１
、５−２ 。When specified as the X/Y axis cutting ring cutting axis signal axis, power supply 5-1
, 5-2.
５−３．・・・・・・・・・の出力はＯＦＦになり、電
源６−１ 、６−２ 、６−３・・・・・・・・・の出
力はＯＮになる。5-3. The outputs of the power supplies 6-1, 6-2, 6-3, .
またＸ／Ｙ軸切換信号がＹ軸を指定した場合にはその逆
になる。Moreover, when the X/Y-axis switching signal specifies the Y-axis, the opposite is true.
位置検出器７には位置検出用のための位置検出用コイル
（図示省略）が設けられ、後述する理由によりＸ軸方向
の座標およびｙ軸方向の座標が得られるものである。The position detector 7 is provided with a position detection coil (not shown) for detecting the position, and can obtain the coordinates in the X-axis direction and the coordinates in the y-axis direction for reasons described later.
いま、第２図に示す如く、磁界発生用コイル３１．３−
２．３−３に接続した交流電源５−１゜５−２．５−３
を接続し、交流電源５−１にはＡｓ１ｎ（ω１＋０）の
電圧を発生させ、交流電源５−２にはＡ ５ｉｎ（ωｔ
＋−）の電圧を発生させ、交流電源５−３にはＡｓ１ｎ
（ωｔ＋π）の電圧を発生させるものとする。Now, as shown in FIG. 2, the magnetic field generating coil 31.3-
AC power supply connected to 2.3-3 5-1゜5-2.5-3
is connected, the AC power supply 5-1 generates a voltage of As1n (ω1+0), and the AC power supply 5-2 generates a voltage of A5in (ωt
+-) voltage is generated, and the AC power supply 5-3 has As1n.
It is assumed that a voltage of (ωt+π) is generated.
このとき、千同板２では、磁界発生用コイル３−１の上
部において位置検出器７に設けた位置検出コイルに発生
される交流電圧の位相を基準とすれは、磁界発生用コイ
ル３−２の上部にて位置検出器７に発生される交流電圧
は上記基準位相に比較して十−だけ位相差のづれたもの
となり、磁界発生用コイル３−３の上部にて位置検出器
７に発生される交流電圧は＋πだけ位相差を有するもの
となる。At this time, in the Sendo board 2, the phase of the AC voltage generated in the position detection coil provided in the position detector 7 above the magnetic field generation coil 3-1 is used as a reference. The AC voltage generated in the position detector 7 at the upper part of the magnetic field generating coil 3-3 has a phase difference of 10- compared to the above reference phase, and is generated in the position detector 7 at the upper part of the magnetic field generating coil 3-3. The resulting AC voltage has a phase difference of +π.
そして磁界発生用コイル３−１と３−２の中間では＋−
だけ位相差を有する交流電圧が発生され、磁界発生用コ
イル３−２と３−３の中間では十−πだけ位相差を有す
る交流電圧が発生されることになる。And between the magnetic field generating coils 3-1 and 3-2, +-
An AC voltage having a phase difference of 10-π is generated between the magnetic field generating coils 3-2 and 3-3.
このようにして、位置検出器７により検出される交流電
圧は、基準電圧に比較してＸ軸方向の位置に応じて０．
！、”π、ユπ、π・・・・・・という、第２図の実線
Ｐに示す如く、位相変化を有するものになる。In this way, the AC voltage detected by the position detector 7 varies from 0 to 0 depending on the position in the X-axis direction compared to the reference voltage.
! , "π, uπ, π...", as shown by the solid line P in FIG. 2, which has a phase change.
しかしながら、実際に位置検出器７から得られる検出信
号は、点線ｙに示す如く非直線的な位相差を有するもの
となる。However, the detection signal actually obtained from the position detector 7 has a non-linear phase difference as shown by the dotted line y.
それ故、第１図において、位置検出器７から得られた検
出信号を位相検波器８により基準位相信号と比較して得
られる位相信号を補正することが必要となる。Therefore, in FIG. 1, it is necessary to correct the phase signal obtained by comparing the detection signal obtained from the position detector 7 with a reference phase signal by the phase detector 8.
このために、位置検出器７から得られた検出信号と、実
際の位置とを対比した補正テーブルを例えばＲＯＭにセ
ットしておき、上記位相検波器８の出力を該補正テーブ
ルにより正確な座標情報に補正する必要がある。For this purpose, a correction table that compares the detection signal obtained from the position detector 7 with the actual position is set in, for example, a ROM, and the output of the phase detector 8 is converted into accurate coordinate information using the correction table. need to be corrected.
勿論同様にしてｙ軸方向の座標を検出し、これにより位
置検出器の正確な平面上の座標を得るようにしている。Of course, the coordinates in the y-axis direction are detected in the same manner, thereby obtaining accurate coordinates of the position detector on the plane.
このように、第１図および第２図に示す如き位相差検出
方式の座標読取装置では座標位置と、位相差との出力が
非直線であり、これを実験にもとづき補正値を決め修正
しなければならないという問題が存在した。In this way, in the coordinate reading device using the phase difference detection method as shown in Figs. 1 and 2, the output of the coordinate position and the phase difference is non-linear, and this must be corrected by determining a correction value based on experiments. There was a problem that it had to be done.
したがって本発明ではこのような問題を改善するために
、座標位置と位相差との出力信号が直線的になるような
位相差検出方式における座標読取装置に対する磁界発生
装置を提供することを目的とするものであって、このた
めに本発明における磁界発生装置では、千拵板上の位置
により位相の異なる交流磁界を発生する交流磁界発生手
段と、上記交流磁界を検出する交流磁界検出手段と、上
記交流磁界検出手段より得られる信号の位相差を検出す
る位相差検出手段を具備する座標読取装置において、渦
巻状に巻回された磁界発生コイルを同一座標軸方向に複
数個設けるとともに、該磁界発生コイルが同一座標軸用
の他の磁界発生コイルの一部と重なるように配置すると
ともに、同一座標軸の上記複数の磁界発生コイルに位相
の異なる交流電流を流す交流電流発生源を接続したこと
を特徴とする。Therefore, in order to improve such problems, it is an object of the present invention to provide a magnetic field generating device for a coordinate reading device using a phase difference detection method, in which the output signal between the coordinate position and the phase difference becomes linear. For this purpose, the magnetic field generating device according to the present invention includes an alternating current magnetic field generating means that generates an alternating current magnetic field whose phase differs depending on the position on the plate, an alternating current magnetic field detecting means that detects the alternating magnetic field, and an alternating current magnetic field detecting means that detects the alternating magnetic field. In a coordinate reading device equipped with a phase difference detection means for detecting a phase difference between signals obtained from an alternating current magnetic field detection means, a plurality of spirally wound magnetic field generation coils are provided in the same coordinate axis direction, and the magnetic field generation coil is arranged so as to overlap with a part of other magnetic field generating coils for the same coordinate axis, and an alternating current generating source that flows alternating currents with different phases is connected to the plurality of magnetic field generating coils for the same coordinate axis. .
以下本発明の一実施例を第３図乃至第５図にもとづき説
明する。An embodiment of the present invention will be described below with reference to FIGS. 3 to 5.
第３図イは本発明におけるＸ軸方向の磁界発生コイルの
一実施例を示すものであり、図示省略しているがｙ軸方
向にも同様の磁界発生コイルが設けられており、また第
３図口は磁界結合器による磁界検出状態を示す。FIG. 3A shows one embodiment of the magnetic field generating coil in the X-axis direction according to the present invention, and although not shown, a similar magnetic field generating coil is also provided in the Y-axis direction, and a third The figure opening shows the state of magnetic field detection by the magnetic field coupler.
第４図イ２口は磁界発生コイルの動作状態説明図、第５
図は本発明における位置−位相特性図である。Figure 4 A2 is an explanatory diagram of the operating state of the magnetic field generating coil, Figure 5
The figure is a position-phase characteristic diagram in the present invention.
図中、他国と同符号部は同一部分を示し、９乃至１１は
磁界発生用コイル、１２乃至１４は交流電源、２０は磁
界結合器である。In the figure, the same reference numerals as in other countries indicate the same parts, 9 to 11 are magnetic field generating coils, 12 to 14 are AC power supplies, and 20 is a magnetic field coupler.
磁界発生用コイル９は交流磁界を発生するためのもので
あって、第３図イに示す如く、渦巻状に、複数回子細コ
イル部分が巻回された形状に構成されている。The magnetic field generating coil 9 is for generating an alternating current magnetic field, and has a shape in which a thin coil portion is wound in a spiral shape a plurality of times, as shown in FIG. 3A.
そしてその中心部分に配置された平面コイル部分は細長
く矩形状に形成され周辺部分に拡がるにつれて幅広の矩
形状の平面コイルに構成されている。The planar coil portion disposed at the central portion is formed into a long and narrow rectangular shape, and the planar coil portion becomes wider as it expands to the peripheral portion.
磁界発生用コイル１０は、磁界発生用コイル９と略同様
の形状に構成されているが、そのコイルの一部分が、第
３図イに示す如く、磁界発生用コイル９の周辺部分と重
なり合って配置されている。The magnetic field generating coil 10 is configured to have approximately the same shape as the magnetic field generating coil 9, but a portion of the coil is arranged so as to overlap the peripheral portion of the magnetic field generating coil 9, as shown in FIG. 3A. has been done.
磁界発生用コイル１１は、磁界発生用コイル９，１０と
略同様の形状に構成されているが、磁界発生用コイル１
０の周辺部分と、第３図イに示す如く一部型なり合って
配置されている。The magnetic field generation coil 11 is configured to have substantially the same shape as the magnetic field generation coils 9 and 10, but the magnetic field generation coil 1
As shown in FIG. 3A, they are arranged so as to partially align with the peripheral portion of 0.
そして磁界発生用コイル９にはＡ１５ｉｎ（ω１＋０）
という交流電圧を発生する交流電源１２が接続され、磁
界発生用コイル１０にはＡ２５ｉｎ（ωｔ＋１）という
交流電圧を発生する交流電源１３が接続され、磁界発生
用コイル１１にはＡ３５ｉｎ（ωｔ＋π）という交流電
圧を発生する交流電源１４が接続される。And A15in (ω1+0) for the magnetic field generation coil 9.
An AC power supply 12 that generates an AC voltage of A25in (ωt+1) is connected to the magnetic field generation coil 10, and an AC power supply 13 that generates an AC voltage of A25in (ωt+1) is connected to the magnetic field generation coil 11. An AC power supply 14 that generates voltage is connected.
したがって、いま、Ａ１＝Ａ２＝Ａ３とすればこれらの
磁界発生用コイル９，１０．１１からｈだけ離れた位置
に平面板２を置き、かつ磁界発生用コイル９の中心をＢ
、磁界発生用コイル１０の中心をＡ、磁界発生用コイル
１１の中心をＣ，ＢＡおよびＡＣの距離をそれぞれｌ
、ＢＡの距離の４等分点をａ□、ａ２．ａ３．ＡＣの距
離の４等分点をａ４１ａ５１ａ６とする。Therefore, if A1=A2=A3, the flat plate 2 is placed at a distance h from these magnetic field generating coils 9, 10, 11, and the center of the magnetic field generating coil 9 is set at B.
, the center of the magnetic field generation coil 10 is A, the center of the magnetic field generation coil 11 is C, and the distances between BA and AC are l, respectively.
, BA are divided into four equal parts by a□, a2. a3. Let a41a51a6 be the quartering point of the distance of AC.
そして第３図口に示すように平行板２上に方向性を有す
る磁界結合器２０を置きＺ方向の磁界を検出するとする
。Assume that a directional magnetic field coupler 20 is placed on the parallel plate 2 to detect a magnetic field in the Z direction, as shown in the opening of FIG.
このとき磁界結合器２０の検出コイルの両端には電圧ｅ
が励起され、Ｂ、Ａ、Ｃ点では、第４図イのようになる
。At this time, a voltage e is applied across the detection coil of the magnetic field coupler 20.
is excited, and at points B, A, and C, the state becomes as shown in Fig. 4 (a).
すなわち第３図イのＡ点に磁界結合器２０を置いたとき
その検出コイルに励起される電圧はＥ２５ｘｎ（（ｃ）
ｔ ＋ ）となり、Ｂ点ではＥｌｓｉｎ（ωｔ＋Ｏ）
、Ｃ点ではＥ３ｓｉｎ（ωｔ＋π）となる。That is, when the magnetic field coupler 20 is placed at point A in Fig. 3A, the voltage excited in the detection coil is E25xn ((c)
t + ), and at point B Elsin(ωt+O)
, at point C, E3sin(ωt+π).
第４図イでは考え易くするため、励起される電圧の振幅
Ｅ１〜Ｅ３はすべて一定として図示しているが、端部で
あるＢ、Ｃ点での振幅は実際はＡ点のものより小さくな
る。In FIG. 4A, for ease of understanding, the amplitudes E1 to E3 of the excited voltages are all shown as constant, but the amplitudes at points B and C, which are the ends, are actually smaller than that at point A.
次にａ（、ａ２ ） ａ３点（ＢＡ間の点）と、ａ４゜
ａ、 、 ａ（３点に磁界結合器２０の検出コイルを置
いたときにこれに励起される電圧は次のようになる。Next, when the detection coil of the magnetic field coupler 20 is placed at points a (, a2), a3 (point between BA) and a4゜a, , a (3 points), the voltage excited by the detection coil is as follows. Become.
したがッテ上記Ｅ０をＶ□、Ｅ２をＶ６．Ｅ３をｖ９と
して示せば、第４図口においてＢ−Ｃ点までの各点の励
磁電圧は下記のようになる。However, the above E0 is set to V□, and E2 is set to V6. If E3 is expressed as v9, the excitation voltage at each point up to point B-C in Figure 4 is as follows.
第４図口では便宜上Ｖ１〜Ｖ、は同一振幅として図示し
てあルカ、実際はｖ、〉Ｖ４〉ｖ３〉Ｖ２〉Ｖｌ。In Figure 4, for convenience, V1 to V are shown as having the same amplitude; in reality, they are v, >V4>v3>V2>Vl.
ｖ４−ｖ６．Ｖ２＝ｖ７．Ｖ２＝Ｖ８．ｖ１＝ｖ、ノヨ
うな関係となる。v4-v6. V2=v7. V2=V8. v1=v, which is a similar relationship.
第５図は、本発明にもとづき構成された磁界発生装置の
位相差特性である。FIG. 5 shows the phase difference characteristics of the magnetic field generator configured according to the present invention.
これにより磁界発生用コイルが重ね合わされていないＢ
点およびＣ点の側部では非直線性が存在しているものの
、Ｂ点とＣ点の間では位相差と位置との関係が直線的で
あることがわかる。As a result, the magnetic field generating coils are not overlapped B
Although nonlinearity exists on the sides of point B and point C, it can be seen that the relationship between the phase difference and the position is linear between point B and point C.
このような磁界発生用コイルをＸ軸およびｙ軸方向にそ
れぞれ設けることにより、従来の如く、補正手段を使用
することなく正確にその座標位置を検出することができ
る。By providing such magnetic field generating coils in the X-axis and y-axis directions, it is possible to accurately detect the coordinate position without using correction means as in the prior art.
結局本発明によれば、非常に精度の高い位置−位相差出
力を得ることができる磁界発生装置を提供することがで
きるので、例えばこれを座標読取装置に使用した場合に
、非常にすぐれた座標読取装置を得ることができる。After all, according to the present invention, it is possible to provide a magnetic field generating device that can obtain a highly accurate position-phase difference output, so when this is used, for example, in a coordinate reading device, it is possible to provide a highly accurate coordinate reading device. A reading device can be obtained.
なお、上記の説明では矩形状の渦巻きコイルを３個使用
した例について説明したが、コイルの形状は矩形状に限
定されるものでもなく、その重ね方も上記説明に限定さ
れるものでもなく、勿論釜コイルに印加される交流電圧
の位相差も上記説明のものに限定されるものではない。In addition, in the above explanation, an example was explained in which three rectangular spiral coils were used, but the shape of the coils is not limited to a rectangular shape, nor is the way of stacking them limited to the above explanation. Of course, the phase difference of the AC voltage applied to the hook coil is not limited to that described above.
第１図は位相差検出方式による座標読取装置、第２図は
その特性図、第３図イは本発明の磁界発生装置の一実施
例構成、第３図口はこれに使用する磁界検出手段の一例
、第４図はその動作状態説明図、第５図はその位置−位
相特性図である。
図中、１は交流磁界発生器、２は平面板、３−１ 、３
−２ 、・・・・・・・・・および４−１ 、４−２
、・・・・・・・・・は磁界発生用コイル、５−１ 、
５−２・・・・・・オヨび６−１ 、６−２・・・・・
・・・・は交流電源、７は位置検出器、８は位相検波器
、９，１０．１１は磁界発生用コイル １２，１３．１
４は交流電源をそれぞれ示す。Fig. 1 shows a coordinate reading device using a phase difference detection method, Fig. 2 shows its characteristics, Fig. 3 A shows the configuration of an embodiment of the magnetic field generating device of the present invention, and Fig. 3 shows the magnetic field detection means used therein. FIG. 4 is an explanatory diagram of its operating state, and FIG. 5 is its position-phase characteristic diagram. In the figure, 1 is an AC magnetic field generator, 2 is a flat plate, 3-1, 3
-2 , ...... and 4-1 , 4-2
, . . . is a magnetic field generating coil, 5-1,
5-2... Oyobi 6-1, 6-2...
... is an AC power supply, 7 is a position detector, 8 is a phase detector, 9, 10.11 is a magnetic field generation coil 12, 13.1
4 each indicates an AC power source.
Claims (1)
する交流磁界発生手段と、上記交流磁界を検出する交流
磁界検出手段と、上記交流磁界検出手段より得られる信
号の位相差を検出する位相差検出手段を具備する座標読
取装置において、渦巻状に巻回された磁界発生コイルを
同一座標軸方向に複数個設けるとともに、該磁界発生コ
イルが同一座標軸用の他の磁界発生コイルの一部と重な
るように配置するとともに、同一座標軸の上記複数の磁
界発生コイルに位相の異なる交流電流を流す交流電流発
生源を接続したことを特徴とする磁界発生装置。 ２ 上記磁界発生コイルは四辺形状で渦巻状に複数回数
巻回された平面状コイルよりなることを特徴とする特許
請求の範囲第１項記載の磁界発生装置。[Scope of Claims] 1. AC magnetic field generating means for generating an AC magnetic field whose phase differs depending on the position on a plane plate, AC magnetic field detecting means for detecting the AC magnetic field, and the position of a signal obtained from the AC magnetic field detecting means. In a coordinate reading device equipped with a phase difference detection means for detecting a phase difference, a plurality of spirally wound magnetic field generating coils are provided in the same coordinate axis direction, and the magnetic field generating coil is connected to other magnetic field generating coils for the same coordinate axis. What is claimed is: 1. A magnetic field generating device, characterized in that an alternating current generating source is connected to the plurality of magnetic field generating coils arranged so as to partially overlap with each other and passing alternating currents having different phases through the plurality of magnetic field generating coils having the same coordinate axes. 2. The magnetic field generating device according to claim 1, wherein the magnetic field generating coil is a quadrilateral planar coil wound spirally a plurality of times.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55049478A JPS5828619B2 (en) | 1980-04-15 | 1980-04-15 | magnetic field generator |
| US06/238,961 US4418242A (en) | 1980-03-04 | 1981-02-27 | Coordinate reading apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55049478A JPS5828619B2 (en) | 1980-04-15 | 1980-04-15 | magnetic field generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56147279A JPS56147279A (en) | 1981-11-16 |
| JPS5828619B2 true JPS5828619B2 (en) | 1983-06-17 |
Family
ID=12832258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55049478A Expired JPS5828619B2 (en) | 1980-03-04 | 1980-04-15 | magnetic field generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5828619B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0115384Y2 (en) * | 1984-03-23 | 1989-05-09 |
-
1980
- 1980-04-15 JP JP55049478A patent/JPS5828619B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0115384Y2 (en) * | 1984-03-23 | 1989-05-09 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56147279A (en) | 1981-11-16 |
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