JPH04195384A - Magnetic marker - Google Patents
Magnetic markerInfo
- Publication number
- JPH04195384A JPH04195384A JP2327788A JP32778890A JPH04195384A JP H04195384 A JPH04195384 A JP H04195384A JP 2327788 A JP2327788 A JP 2327788A JP 32778890 A JP32778890 A JP 32778890A JP H04195384 A JPH04195384 A JP H04195384A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic thin
- thin wire
- marker
- ribbon
- 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.)
- Granted
Links
- 239000003550 marker Substances 0.000 title claims abstract description 30
- 230000005330 Barkhausen effect Effects 0.000 claims abstract description 14
- 239000000696 magnetic material Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 239000010941 cobalt Substances 0.000 abstract description 4
- 229910017052 cobalt Inorganic materials 0.000 abstract description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract description 4
- 229920002799 BoPET Polymers 0.000 abstract description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052796 boron Inorganic materials 0.000 abstract description 2
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 239000010703 silicon Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 10
- 230000005415 magnetization Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は物品の有無を検出するために、その物品にとり
つける磁気マーカに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic marker attached to an article to detect the presence or absence of the article.
［従来の技術］
物品にマーカをとりつけることにより、その物品の数量
、種類の検出、もしくは物品の盗難防止に利用できるこ
とが知られている。[Prior Art] It is known that by attaching a marker to an article, it can be used to detect the quantity and type of the article or to prevent the article from being stolen.
従来より、このようなマーカは、直接マーカが目に見え
ないようにとりつけられ、磁気やマイクロ波により検知
される方法が一般的に採用されている。Conventionally, such markers have generally been attached in such a way that they are not visible to the naked eye, and detected using magnetism or microwaves.
たとえば、アモルファス薄帯や細線に交流磁界をかけ、
その結果生じる高周波を検出するものや、アルミ箔でコ
イルとコンデンサを形成し、外部より電波を照射し、マ
ーカにおけるＬＣ共振現象を検知するものなどがある。For example, by applying an alternating magnetic field to an amorphous ribbon or thin wire,
There are those that detect the resulting high frequency waves, and those that form a coil and capacitor with aluminum foil, emit radio waves from the outside, and detect the LC resonance phenomenon in the marker.
なかでも、大バルクハウゼン特性を有するアモルファス
磁性線をマーカとして物体に取り付け、交番磁界により
磁性薄帯（細線）が磁化反転する際に発する鋭いパルス
を検出する方法は、高感度で軽量、しかも誤検知のすく
ないシステムを構成することかできるという点で優れた
ものとなっている。Among these methods, a method that attaches an amorphous magnetic wire with large Barkhausen characteristics to an object as a marker and detects the sharp pulse emitted when the magnetization of a magnetic ribbon (thin wire) is reversed by an alternating magnetic field is highly sensitive, lightweight, and error-prone. It is excellent in that it is possible to configure a system that is less likely to be detected.
［発明が解決しようとする課題］
大バルクハウゼン効果を利用したマーカは有用なもので
あるが、なお、次に示すような問題をもっている。すな
わち、マーカが大バルクハウゼン効果を利用しているた
め、この効果を十分に発揮させるためには磁性線の長さ
に最小長が存在し、この限界を越えて磁性線の長さを短
縮した場合は、大バルクハウゼン効果が発生しなくなる
という問題がある。換言すれば、素子が限界より短くな
ると鋭いパルスを生じなくなり、パルスの検知ができな
くなるという問題があり、マーカの小型化を阻害してい
る。[Problems to be Solved by the Invention] Although markers using the large Barkhausen effect are useful, they still have the following problems. In other words, since the marker uses the large Barkhausen effect, there is a minimum length of the magnetic line in order to fully demonstrate this effect, and the length of the magnetic line must be shortened beyond this limit. In this case, there is a problem that the large Barkhausen effect no longer occurs. In other words, if the element is made shorter than the limit, it will no longer generate sharp pulses and pulses cannot be detected, which hinders miniaturization of the marker.
大バルクハウゼン効果は、磁性体に印加された外部磁界
Ｈｅｘより磁性体が磁化される際に磁性体に生じる反磁
界Ｈｄを差し引いた値である有効磁界ＨＥＦが連軸形成
限界磁界Ｈ°と磁壁移動限界磁界Ｈ０を上回った瞬間に
始まる急激な磁化反転現象である。したがって、大バル
クハウゼン効果は、磁性体の磁化反転の臨界点であるＨ
ｏを越えた瞬間に生じ、Ｈ’＞Ｈ，の関係が成立する限
り、磁化反転は残留磁化Ｍ３から−Ｍｉ＋まで途中で止
まることなくデジタル的に進行する。よって、この磁化
反転に伴う電磁誘導電圧は外部磁界や磁界変化速度に関
係なく一定であり、電圧波形が鋭いパルスであることに
特長がある。The large Barkhausen effect is based on the fact that the effective magnetic field HEF, which is the value obtained by subtracting the demagnetizing field Hd generated in a magnetic material when it is magnetized, from the external magnetic field Hex applied to the magnetic material, is equal to the interlocking axis formation limit magnetic field H° and the domain wall. This is a rapid magnetization reversal phenomenon that begins the moment the magnetic field exceeds the transfer limit H0. Therefore, the large Barkhausen effect is caused by H
As long as the relationship H'>H holds true, the magnetization reversal progresses digitally from the residual magnetization M3 to -Mi+ without stopping on the way. Therefore, the electromagnetic induction voltage accompanying this magnetization reversal is constant regardless of the external magnetic field or the rate of change of the magnetic field, and the voltage waveform is characterized by a sharp pulse.
しかしながら、磁性体の形状によって決定される反磁界
係数Ｎｄが大きな場合、すなわち磁性体の長さが短い場
合には、ＨＥＸ Ｈｄ＞ Ｈ’またはＨＥＸ Ｈｄ
＞Ｈｏの関係が成立しなくなり、パルクツ＼ウゼン効果
が起こらなくなったり不完全になる。However, when the demagnetizing field coefficient Nd determined by the shape of the magnetic body is large, that is, when the length of the magnetic body is short, HEX Hd >H' or HEX Hd
>Ho relationship no longer holds, and the Parktsu\Uzen effect no longer occurs or becomes incomplete.
本発明は上述の点に鑑みてなされたものであり、大バル
クハウゼン効果が生じる最低素子長を小さくして、マー
カの小型化を実現することを目的とするものである。The present invention has been made in view of the above points, and it is an object of the present invention to reduce the minimum element length at which the large Barkhausen effect occurs, thereby realizing miniaturization of the marker.
［課題を解決するための手段］
上記目的を達成するため、本発明は、大バルクハウゼン
効果を利用した線状または帯状の磁気マーカにおいて、
パルス発生磁性体の端部に、該磁性体の保磁力より小さ
な保磁力を有する別の磁性体を配置した構造を有するこ
とを特徴としている。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a linear or strip-shaped magnetic marker that utilizes the large Barkhausen effect.
It is characterized by having a structure in which another magnetic body having a coercive force smaller than the coercive force of the magnetic body is arranged at the end of the pulse-generating magnetic body.
［作用コ
本発明に係る磁気マーカは、大バルクハウゼン効果を有
する磁性薄帯（細線）と、これの端部に付帯させた保磁
力Ｈｃが該磁性薄帯（細線）より小さな磁性体から構成
されている。この付帯された磁性体のため磁性薄帯（細
線）の反磁界が低減され、その結果、磁性薄帯（細線）
のみの構成では、反磁界が過大になって大バルクハウゼ
ン効果が観察されないような短い寸法の磁気マーカから
も、良好なバルクハウゼン信号が得られるようになる。[Operation] The magnetic marker according to the present invention is composed of a magnetic ribbon (thin wire) having a large Barkhausen effect, and a magnetic material attached to the end of which the coercive force Hc is smaller than that of the magnetic ribbon (thin wire). has been done. Because of this attached magnetic material, the demagnetizing field of the magnetic ribbon (thin wire) is reduced, and as a result, the magnetic ribbon (thin wire)
With this configuration, a good Barkhausen signal can be obtained even from a short-sized magnetic marker where the demagnetizing field is too large and the large Barkhausen effect cannot be observed.
し実施例コ
以下、本発明を添付の図面を参照して、その実施例にも
とづき説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the accompanying drawings.
なお、以降の説明は大バルクハウゼン効果を有する磁性
細線とそれに付帯させた磁性薄体との組合せの例をもっ
て進めてい（が、本発明は他の組合せにおいても同様に
適用可能である。Note that the following explanation is based on an example of a combination of a magnetic thin wire having a large Barkhausen effect and a magnetic thin body attached thereto (although the present invention is equally applicable to other combinations).
第１図に本発明を適用した磁気マーカの概略図を示す。FIG. 1 shows a schematic diagram of a magnetic marker to which the present invention is applied.
第１図において、パルス発生素子である磁性細線１１と
磁性薄帯１３は、基材１２と基材１４により上下から挟
まれることにより固定され、磁気マーカを構成している
。基材の材質や厚みは、マーカの使われる用途により様
々であるが、通常、基材１２と基材１４には、粘着層付
きで２０μ−程度の厚みのＰＥＴフィルムが用いられ、
基材１２の粘着層は被検出物品に張り付けるために用い
られる。そして、基材１４の粘着層は磁性細線１１と磁
性薄帯１３を固定し、さらに基材１２，１４同士を接着
するために使われる。In FIG. 1, a magnetic thin wire 11 and a magnetic ribbon 13, which are pulse generating elements, are fixed by being sandwiched from above and below by a base material 12 and a base material 14, and constitute a magnetic marker. The material and thickness of the base material vary depending on the purpose for which the marker is used, but usually a PET film with an adhesive layer and a thickness of about 20μ is used as the base material 12 and the base material 14.
The adhesive layer of the base material 12 is used to attach it to the object to be detected. The adhesive layer of the base material 14 is used to fix the magnetic thin wire 11 and the magnetic ribbon 13, and also to bond the base materials 12 and 14 together.
次に、本発明を適用した磁気マーカの具体的な実施例を
示して、本発明を、より具体的に説明する。Next, the present invention will be described in more detail by showing specific examples of magnetic markers to which the present invention is applied.
なお、磁性体において大バルクハウゼン効果か見られる
場合には磁気履歴曲線がはっきりとした角型を示すこと
から、以後、磁気マーカの磁気履歴曲線を提示すること
により、本発明の効果を示すことにする。Note that when a large Barkhausen effect is observed in a magnetic material, the magnetic hysteresis curve exhibits a clear square shape, so that the effects of the present invention will be demonstrated by presenting the magnetic hysteresis curve of a magnetic marker. Make it.
第２図（ａ）、 （ｂ）ないし第７図（ａ）、 （
ｂ）が、それぞれ本発明の実施例１ないし実施例６の特
性を示すものであり、第９図（ａ）、 （ｂ）が本発
明を適用しなかった場合の比較例である。Figures 2(a), (b) to 7(a), (
9b) shows the characteristics of Examples 1 to 6 of the present invention, respectively, and FIGS. 9(a) and 9(b) are comparative examples in which the present invention was not applied.
なお、実施例と比較例において用いた磁性細線１１は、
コバルトと鉄にシリコンとボロンをくわえたアモルファ
ス軟磁性細線であり、付帯させた磁性薄帯１３はコバル
ト系のアモルファス薄体である。それぞれの磁性体の周
波数６０Ｈｚにおける保磁力は、磁性細線１１が０．２
エルステド、磁性薄帯１３では０．０１エルステツドと
なっている。In addition, the magnetic thin wire 11 used in the examples and comparative examples is as follows:
It is an amorphous soft magnetic thin wire made by adding silicon and boron to cobalt and iron, and the attached magnetic thin ribbon 13 is a cobalt-based amorphous thin body. The coercive force of each magnetic material at a frequency of 60 Hz is 0.2 for the magnetic thin wire 11.
Oersted and magnetic ribbon 13 have an Oersted of 0.01 Oersted.
また、磁性細線１１の直径は０．１２ｎ＋ｏ＋であり、
磁性薄帯１３の寸法は実施例１ないし実施例４において
は１０Ｘ１０＋＋ｕｎ、実施例５と実施例６においては
、磁性薄帯１３の幅と長さの寸法を変化させている。磁
性薄帯１３の厚さは、各実施例において２０μｍである
。Moreover, the diameter of the magnetic thin wire 11 is 0.12n+o+,
The dimensions of the magnetic ribbon 13 are 10x10++un in Examples 1 to 4, and the width and length of the magnetic ribbon 13 are changed in Examples 5 and 6. The thickness of the magnetic ribbon 13 is 20 μm in each example.
次いで、実施例１についての説明を第２図（ａ）、 （
ｂ）にもとづきおこなう。Next, the explanation of Example 1 is shown in FIG. 2(a), (
Based on b).
第２図（ｂ）は、磁性薄帯１３を磁性細線１１の端部全
体に重なった形で構成した第２図（ａ）に示す磁気マー
カの長さによる磁気履歴曲線の変化の様子を示している
。第２図（ｂ）の各磁気履歴曲線の上部に示した長さは
、磁性細線１１の長さである。これらの測定例かられか
るように、本実施例においては、磁性細線１１の長さが
５ｃＩ１１に至るまで角形性のよい磁気マーカが得られ
たことがわかる。FIG. 2(b) shows how the magnetic hysteresis curve changes depending on the length of the magnetic marker shown in FIG. 2(a), in which the magnetic ribbon 13 overlaps the entire end of the magnetic thin wire 11. ing. The length shown above each magnetic hysteresis curve in FIG. 2(b) is the length of the magnetic thin wire 11. As can be seen from these measurement examples, it can be seen that in this example, magnetic markers with good squareness were obtained up to the length of the magnetic thin wire 11 of 5 cI11.
一方、第９図（ａ）、 （ｂ）に示した比較例、すな
わち、磁性細線１１のみにて構成した例においては、良
好な角形性は磁性線の長さが７ｃｍ＋までしか得られて
いない。On the other hand, in the comparative example shown in FIGS. 9(a) and 9(b), that is, the example constructed only of the magnetic thin wire 11, good squareness was obtained only up to the length of the magnetic wire 7 cm+. .
第３図（ａ）、 （ｂ）に示した実施例２は、磁性薄
帯１３を半分磁線線１１にかふせた構造の磁気マーカの
特性例である。この実施例においても、良好な角形性は
磁性細線１１の長さが５ｃｍにいたるまで保たれている
。Embodiment 2 shown in FIGS. 3(a) and 3(b) is an example of the characteristics of a magnetic marker having a structure in which a magnetic thin strip 13 covers half of the magnetic wire 11. In this example as well, good squareness is maintained until the length of the magnetic thin wire 11 reaches 5 cm.
第４図（ａ）、 （ｂ）に示した実施例３は、磁性薄
帯１３を磁性細線１１の端部に接するように配置した場
合の実施例であり、本実施例では、上述した実施例など
の効果は見られないが、磁性細線１１の長さが６ｃｍま
で角形性が保たれていることがわかる。Embodiment 3 shown in FIGS. 4(a) and 4(b) is an embodiment in which the magnetic ribbon 13 is arranged so as to be in contact with the end of the magnetic thin wire 11. Although the effect of the example is not observed, it can be seen that the squareness is maintained up to the length of the magnetic thin wire 11 of 6 cm.
さらに、第５図（ａ）、 （ｂ）に示した実施例４で
は、磁性細線１１の片側にのみ磁性薄帯１３を配した構
造の磁気マーカの特性例である。この実施例でも、磁性
薄帯１３の効果が表れており、磁性細線の長さが５Ｃ■
まで角形性が保たれていることがわかる。Furthermore, Example 4 shown in FIGS. 5(a) and 5(b) is an example of the characteristics of a magnetic marker having a structure in which a magnetic ribbon 13 is disposed only on one side of the magnetic thin wire 11. This example also shows the effect of the magnetic thin strip 13, and the length of the magnetic thin wire is 5C■
It can be seen that the squareness is maintained until the end.
つづいて、磁性薄帯１３の寸法に関する実験結果を第６
図（ａ）、 （ｂ）（実施例５）と第７図（ａ）、
（ｂ）（実施例６）に示す。これらの実施例において
は、磁性細線１１の端部が磁性薄帯１３の中心部に位置
するように、磁気マーカを組み立てた。Next, the experimental results regarding the dimensions of the magnetic ribbon 13 will be presented in the sixth section.
Figures (a), (b) (Example 5) and Figure 7 (a),
(b) (Example 6). In these examples, the magnetic marker was assembled so that the end of the magnetic thin wire 11 was located at the center of the magnetic ribbon 13.
第６図（ａ）、 （ｂ）の実施例５は、磁性薄帯１３
の寸法を５Ｘ５＋ａｍとした例である。Embodiment 5 in FIGS. 6(a) and 6(b) shows the magnetic ribbon 13
This is an example in which the dimensions are 5×5+am.
上記第６図（ｂ）からも明らかなように、小型の磁性薄
帯１３を用いた場合においても、磁気マーカの小型化は
可能である。As is clear from FIG. 6(b) above, it is possible to miniaturize the magnetic marker even when a small magnetic ribbon 13 is used.
また、磁性薄帯１３の幅を小さくして磁気マーカを構成
した例が第７図（ａ）、 （ｂ）に示す実施例６であ
り、本実施例は磁性薄帯１３を３×１０＠＋ｓの細長い
長方形に変更しても、磁性細線１１の長さは６ｍｍまで
短縮が可能であることを示している。Embodiment 6 shown in FIGS. 7(a) and 7(b) is an example in which a magnetic marker is constructed by reducing the width of the magnetic thin strip 13. In this embodiment, the magnetic thin strip 13 is 3×10@ This shows that even if the shape is changed to an elongated rectangle of +s, the length of the magnetic thin wire 11 can be shortened to 6 mm.
磁性薄帯１３の寸法を更に小型化する試みを行った結果
、３Ｘ３ＩＩＩ＠の薄体を磁性細線１１の両端に用いた
場合では、磁性薄帯１３を用いる効果が観察されなくな
った。また、磁性薄帯１３の幅を小さくしていった結果
、幅がｌ ｍｌ１１（長さは１０ａｍ）の磁性薄帯１３
では効果が表れなくなった。As a result of an attempt to further reduce the size of the magnetic ribbon 13, when a 3×3III@ thin body was used at both ends of the magnetic thin wire 11, the effect of using the magnetic ribbon 13 was no longer observed. In addition, as a result of reducing the width of the magnetic ribbon 13, the magnetic ribbon 13 with a width of 1 ml11 (length 10 am)
The effect no longer appeared.
したがって、本発明を適用した場合の付帯させる磁性体
の寸法としては、長さがパルス発生用の磁性体の１０％
以上（両端に用いた場合は２片の長さの合計）、幅も１
０％以上であることが望ましい。ただし、用いる磁性体
の磁気特性が異なる場合は、この望ましい範囲が変わる
。Therefore, when the present invention is applied, the length of the attached magnetic body is 10% of the magnetic body for pulse generation.
or more (if used at both ends, the total length of the two pieces), and the width is also 1
It is desirable that it is 0% or more. However, if the magnetic properties of the magnetic materials used are different, this desirable range will change.
付帯させる磁性体の寸法が大きくなる場合には、発明の
効果が損なわれることはないが、幅方向に大型化するこ
とは磁気マーカの小型化をさまたげるため好ましくない
。また、磁性体の長さを大きくするとパルス発生用磁性
体本体に対する磁気シールド効果が表れてくるため、過
度の長大化も好ましくない。Although the effects of the invention are not impaired if the dimensions of the attached magnetic body are increased, increasing the size in the width direction is not preferable because it hinders miniaturization of the magnetic marker. Furthermore, if the length of the magnetic body is increased, a magnetic shielding effect will appear on the main body of the pulse-generating magnetic body, so it is also not preferable to increase the length excessively.
第８図は、付帯させた磁性体の長さく両端に付帯させた
磁性薄体の長さの和）と磁気マーカがパルスを発する臨
界磁界であるＨｔとの関係をまとめたものである。FIG. 8 summarizes the relationship between the length of the attached magnetic body (the sum of the lengths of the magnetic thin bodies attached at both ends) and Ht, which is the critical magnetic field at which the magnetic marker emits a pulse.
なお、ここでは第２図（ａ）、 （ｂ）の実施例１に
示したような構成に磁性細線１１と磁性薄帯１３を配し
た。Incidentally, here, the magnetic thin wire 11 and the magnetic thin ribbon 13 are arranged in a structure similar to that shown in Example 1 of FIGS. 2(a) and 2(b).
また、第８図の横軸は長さ７０１１のパルス発生用磁性
細線１１の長さσと、付帯させた磁性薄帯１３の長さの
和Ｑ０との比を示す。ただし、磁性薄帯１３の幅はｌｏ
ｓｍで一定とした。Moreover, the horizontal axis in FIG. 8 shows the ratio of the length σ of the pulse-generating thin magnetic wire 11 having a length of 7011 to the sum Q0 of the lengths of the attached magnetic thin strips 13. However, the width of the magnetic ribbon 13 is lo
It was held constant at sm.
第８図より了解されるように、パルス発生素子の励磁磁
界に対する感度を考慮すると、付帯させる磁性体の長さ
の和がパルス発生用磁性体の長さの５０％以下であるこ
とが好ましい。As understood from FIG. 8, in consideration of the sensitivity of the pulse generating element to the excitation magnetic field, it is preferable that the sum of the lengths of the attached magnetic bodies is 50% or less of the length of the pulse generating magnetic bodies.
［発明の効果］
本発明の磁気マーカは、従来と比べ長さが１５〜３０％
短縮されても大バルクハウゼン効果が生じるためマーカ
を小型にすることが可能となる。[Effect of the invention] The magnetic marker of the present invention has a length of 15 to 30% compared to the conventional one.
Even if it is shortened, a large Barkhausen effect occurs, so it is possible to make the marker smaller.
第１図は、本発明の概念図、
第２図（ａ）、（ｂ）ないし第７図（ａ）、 （ｂ）
は、それぞれ本発明に係る磁気マーカの実施例１から実
施例６の特性説明図面、
第８図は、本発明に用いた磁性薄帯の好ましい大きさを
説明した図、
第９図は、比較例である。
１１・・・磁性細線、１２・・・基材、１３・・・磁性
薄帯、
Ｈｔ・・・パルスが発生するのに必要な外部磁界、Ｑ・
、・パルス発生用磁性細線の長さ、Ｑ、・・・付帯させ
る磁性薄帯の長さ。
特 許 出 願 人 ユニチカ株式会社代理人 弁理士
青 山 葆 はか１名第１図
＋７１
第２図
（ｂ）
２０ｃｍ １５ｃｍ １０
ｃｍ９ｃｍ ８ｃｍ ７ｃｍ６ｃ
ｍ５ｃｍ４ｃｍ
３ｃｍ ２ｃｍ
（ａ） 第４図
（ｂｌ
２０ｃｍ １５ｃｍ
１０ｃｍ６ｃｍ ５（ｍ
４ｃｍ３ｃｍ
２ｃｍ第８図
□〕／Ａ。Fig. 1 is a conceptual diagram of the present invention, Fig. 2 (a), (b) to Fig. 7 (a), (b)
Figure 8 is a diagram illustrating the preferred size of the magnetic ribbon used in the present invention, Figure 9 is a comparison diagram. This is an example. DESCRIPTION OF SYMBOLS 11... Magnetic thin wire, 12... Base material, 13... Magnetic ribbon, Ht... External magnetic field required to generate a pulse, Q.
, Length of the magnetic thin wire for pulse generation, Q, Length of the attached magnetic thin strip. Patent applicant Unitika Co., Ltd. Agent Patent attorney Haka Aoyama 1 person Figure 1 + 71 Figure 2 (b) 20cm 15cm 10
cm9cm 8cm 7cm6c
m5cm4cm 3cm 2cm (a) Figure 4 (bl 20cm 15cm
10cm6cm 5(m
4cm3cm
2cm Fig. 8 □]/A.
Claims (1)
の磁気マーカにおいて、パルス発生磁性体の端部に、該
磁性体の保磁力より小さな保磁力を有する別の磁性体を
配置した構造を有することを特徴とする磁気マーカ。(1) A linear or band-shaped magnetic marker that utilizes the large Barkhausen effect has a structure in which another magnetic material having a coercive force smaller than that of the magnetic material is placed at the end of the pulse-generating magnetic material. A magnetic marker characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2327788A JP2809870B2 (en) | 1990-11-27 | 1990-11-27 | Magnetic marker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2327788A JP2809870B2 (en) | 1990-11-27 | 1990-11-27 | Magnetic marker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04195384A true JPH04195384A (en) | 1992-07-15 |
| JP2809870B2 JP2809870B2 (en) | 1998-10-15 |
Family
ID=18202993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2327788A Expired - Fee Related JP2809870B2 (en) | 1990-11-27 | 1990-11-27 | Magnetic marker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2809870B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0710923A2 (en) | 1994-11-02 | 1996-05-08 | Unitika Ltd. | Magnetic marker |
| EP0773523A1 (en) | 1995-11-08 | 1997-05-14 | Unitika Ltd. | Anti-theft label |
| EP0782013A3 (en) * | 1995-12-27 | 1998-08-12 | Unitika Ltd. | Magnetic marker |
| US6864793B2 (en) | 2000-07-17 | 2005-03-08 | Nhk Spring Co., Ltd. | Magnetic marker and manufacturing method therefor |
| JP2006338563A (en) * | 2005-06-06 | 2006-12-14 | Dainippon Printing Co Ltd | Flame-retardant tag |
| JP2011518331A (en) * | 2008-04-18 | 2011-06-23 | メトグラス・インコーポレーテッド | Remote temperature detection device and related remote temperature detection method |
| JP2011518330A (en) * | 2008-04-18 | 2011-06-23 | メトグラス・インコーポレーテッド | Temperature detector and associated remote temperature detection method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2582123B (en) * | 2018-01-25 | 2021-04-28 | Endomagnetics Ltd | Systems and methods for detecting magnetic markers for surgical guidance |
-
1990
- 1990-11-27 JP JP2327788A patent/JP2809870B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0710923A2 (en) | 1994-11-02 | 1996-05-08 | Unitika Ltd. | Magnetic marker |
| EP0710923A3 (en) * | 1994-11-02 | 1996-07-31 | Unitika Ltd | Magnetic marker |
| US5650236A (en) * | 1994-11-02 | 1997-07-22 | Unitika Ltd. | Magnetic marker |
| EP0773523A1 (en) | 1995-11-08 | 1997-05-14 | Unitika Ltd. | Anti-theft label |
| US5921583A (en) * | 1995-11-08 | 1999-07-13 | Unitika, Ltd. | Antitheft label |
| EP0782013A3 (en) * | 1995-12-27 | 1998-08-12 | Unitika Ltd. | Magnetic marker |
| US6864793B2 (en) | 2000-07-17 | 2005-03-08 | Nhk Spring Co., Ltd. | Magnetic marker and manufacturing method therefor |
| JP2006338563A (en) * | 2005-06-06 | 2006-12-14 | Dainippon Printing Co Ltd | Flame-retardant tag |
| JP2011518331A (en) * | 2008-04-18 | 2011-06-23 | メトグラス・インコーポレーテッド | Remote temperature detection device and related remote temperature detection method |
| JP2011518330A (en) * | 2008-04-18 | 2011-06-23 | メトグラス・インコーポレーテッド | Temperature detector and associated remote temperature detection method |
| KR101419263B1 (en) * | 2008-04-18 | 2014-07-16 | 메트글라스, 인코포레이티드 | Remote temperature sensing device and related remote temperature sensing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2809870B2 (en) | 1998-10-15 |
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