JP2000193534A - Method for storing history information on temperature - Google Patents
Method for storing history information on temperatureInfo
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- JP2000193534A JP2000193534A JP10371327A JP37132798A JP2000193534A JP 2000193534 A JP2000193534 A JP 2000193534A JP 10371327 A JP10371327 A JP 10371327A JP 37132798 A JP37132798 A JP 37132798A JP 2000193534 A JP2000193534 A JP 2000193534A
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- temperature
- history information
- magnetic
- temperature history
- magnet
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Abstract
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、周囲の温度の履歴
情報を記憶する方法に関するものである。The present invention relates to a method of storing ambient temperature history information.
【０００２】[0002]
【従来の技術】従来、周囲の温度の履歴情報を記憶する
場合には、特定温度以上になったときに変色する色素等
を利用した示温材や、各種温度センサと記憶装置を組み
合わせたものが使用されている。2. Description of the Related Art Conventionally, in the case of storing history information of the ambient temperature, a temperature indicating material using a dye or the like that changes color when the temperature exceeds a specific temperature, or a combination of various temperature sensors and a storage device is used. It is used.
【０００３】温度の履歴情報は、各種製品や部品の保
管、流通、使用において、非常に重要な情報である。す
なわち、温度の履歴情報により、製品、部品の状態が判
別でき、品質保証や故障原因の解明等が効率的に実施で
きる。[0003] Temperature history information is very important information in storage, distribution, and use of various products and parts. In other words, the state of products and parts can be determined from the temperature history information, and quality assurance and failure cause clarification can be efficiently performed.
【０００４】しかしながら、従来の示温材の変色によっ
て温度の履歴情報を記憶する場合、ある特定の温度に達
したか否かの記憶しかできない。すなわち、ある特定の
温度で、どの程度の時間が経過したかを示す、時間情報
を記録することができない。また、示温材は、紫外線、
電磁波、湿度等の外部の温度以外の影響を受けやすいの
で、信頼性に問題がある。更に、示温材では、０度以下
の低温や、２００℃以上の高温には、対応できない。対
応できたとしても、数分や数秒で特性が劣化したり、分
解してしまうという欠点を持つ。なお、温度の履歴情報
に秘匿性をもたせる目的には、示温材は使用できない。[0004] However, in the case of storing the temperature history information due to the discoloration of the conventional temperature indicating material, it is only possible to store whether or not the temperature has reached a specific temperature. That is, time information indicating how much time has elapsed at a specific temperature cannot be recorded. In addition, the temperature indicating material is ultraviolet rays,
Since it is susceptible to electromagnetic waves, humidity and the like other than the external temperature, there is a problem in reliability. Furthermore, the temperature indicating material cannot cope with a low temperature of 0 ° C. or lower or a high temperature of 200 ° C. or higher. Even if it can cope, there is a drawback that the characteristics are degraded or decomposed in minutes or seconds. Note that a temperature indicating material cannot be used for the purpose of giving confidentiality to temperature history information.
【０００５】一方、各種温度センサと記憶装置を組み合
わせた場合、多種多様な温度履歴を記憶することが可能
であるが、このシステムへの電力供給が必須であるこ
と、システムを収容するスペースを確保する必要がある
こと等の問題点があり、非常に限定された用途にしか適
用できない。On the other hand, when various temperature sensors and a storage device are combined, it is possible to store a wide variety of temperature histories, but it is necessary to supply power to this system, and a space for accommodating the system is secured. There are problems such as the necessity of performing such operations, and the method can be applied only to very limited uses.
【０００６】また、特開平３−１７００３６号公報に
は、ある物体の温度履歴についての情報を得る方法にお
いて、高温において非可逆的に変態してその磁気的性質
が変わるフェライト含有混粒ステンレス鋼のピースであ
る温度履歴インジケーターに、該物体を予め組み合わ
せ、温度履歴を発現させた後、該ピースの磁気的性質を
測定し、該磁気的性質の変化から該情報を推定すること
から成る方法が開示されている。Japanese Unexamined Patent Publication No. Hei 3-170036 discloses a method for obtaining information on the temperature history of a certain object. In the method, an irreversible transformation is performed at a high temperature to change the magnetic properties of a ferrite-containing mixed grain stainless steel. Disclosed is a method comprising pre-combining the object with a temperature history indicator that is a piece, developing a temperature history, measuring the magnetic properties of the piece, and estimating the information from changes in the magnetic properties. Have been.
【０００７】しかしながら、この方法では、強磁性体で
あるフェライトが４００〜７００℃の高温に曝された際
に、強磁性体ではない炭化物、中間金属相及びオーステ
ナイトに変態することによってその磁気的性質が変化す
ることを利用しており、変態を起こさせるための高温条
件を必須としている。However, in this method, when the ferrite, which is a ferromagnetic material, is exposed to a high temperature of 400 to 700 ° C., the ferrite transforms into a non-ferromagnetic carbide, an intermediate metal phase, and austenite, thereby obtaining its magnetic properties. Changes are required, and high-temperature conditions are required to cause transformation.
【０００８】[0008]
【発明が解決しようとする課題】以上のように、広い温
度領域に対応し、秘匿性を有し、温度以外の外部環境の
影響を受けにくく、安定、効率的で簡便な再現性に優れ
る温度の履歴情報の記憶方法を開発することは大きな課
題であった。SUMMARY OF THE INVENTION As described above, a temperature that is compatible with a wide temperature range, has confidentiality, is hardly affected by external environments other than temperature, and is stable, efficient and has excellent reproducibility. Developing a method of storing the history information has been a major issue.
【０００９】本発明の目的は、効率的で簡便な、温度の
履歴情報の記憶方法を提供することにある。It is an object of the present invention to provide an efficient and simple method of storing temperature history information.
【００１０】[0010]
【課題を解決するための手段】本発明は、周囲の温度変
化の履歴を、磁性体の磁区構造の変化による非可逆的減
磁により記憶することを特徴とする、温度の履歴情報の
記憶方法に関する。According to the present invention, there is provided a method of storing temperature history information, wherein the history of changes in ambient temperature is stored by irreversible demagnetization due to a change in the magnetic domain structure of a magnetic material. About.
【００１１】[0011]
【発明の実施の形態】本発明において定義する「非可逆
的減磁」とは、磁石材料の磁束密度または磁化、特に残
留磁束密度や残留磁化が、温度変化に伴って変化する現
象のうち、組成や形態を維持した状態で磁区構造のみが
温度変化により変化し、元の温度に戻っても磁区構造を
元に戻す磁気的力が加わらないために、前記残留磁束密
度または残留磁化が元の状態に戻らない現象であり、周
囲の温度を前記非可逆的減磁による前記残留磁束密度ま
たは残留磁化の変化量により記憶するものである。BEST MODE FOR CARRYING OUT THE INVENTION The term "irreversible demagnetization" as defined in the present invention refers to a phenomenon in which the magnetic flux density or magnetization of a magnet material, particularly the residual magnetic flux density or residual magnetization, changes with temperature. Only the magnetic domain structure changes due to temperature changes while maintaining the composition and form, and the magnetic flux that restores the magnetic domain structure is not applied even when the temperature returns to the original temperature. This is a phenomenon that does not return to the state, and the ambient temperature is stored as the amount of change in the residual magnetic flux density or residual magnetization due to the irreversible demagnetization.
【００１２】前記特開平３−１７００３６号公報に記載
の方法では、高温条件下に材料が変態することによって
その磁気的特性が変化することを温度履歴の情報記憶手
段としていたが、本発明では、組成や形態を維持した状
態で磁区構造のみが温度変化により変化し、元の温度に
戻っても磁区構造の変化が元に戻らない非可逆減磁を温
度履歴の情報記憶手段手段としているため、幅広い温度
範囲、特に前記公報に比べて遙かに低い温度範囲での使
用が可能となり、幅広い用途、例えば、パソコンなどの
ＯＡ機器の再利用の目安の判断となる温度履歴情報の取
得への適用が可能となる。In the method described in Japanese Patent Application Laid-Open No. 3-170036, the fact that the magnetic properties change due to the transformation of a material under high temperature conditions is used as the information storage means of the temperature history. Since only the magnetic domain structure changes due to temperature change while maintaining the composition and form, even if the temperature returns to the original temperature, the change in the magnetic domain structure does not return to the original irreversible demagnetization is used as the information storage means of the temperature history, It can be used in a wide temperature range, especially in a temperature range much lower than that of the above-mentioned publication, and can be applied to a wide range of applications, for example, acquisition of temperature history information which is a guide for reusing OA equipment such as a personal computer. Becomes possible.
【００１３】本発明の方法では、温度履歴が複雑な場
合、あるいは、より詳細に履歴情報を把握した場合に
は、最高または最低到達温度を変色によって表示可能
な、示温材料を併用することも可能である。例えば、高
い温度で短時間の履歴と、低い温度で長時間の履歴によ
る非可逆的減磁の度合い、つまり残留磁束密度あるいは
残留磁化の変化量が同程度の場合、示温材料の併用によ
って両者を区別することができる。In the method of the present invention, when the temperature history is complicated or when the history information is grasped in more detail, a temperature indicating material capable of displaying the highest or lowest attained temperature by discoloration can be used together. It is. For example, when the degree of irreversible demagnetization due to a short history at a high temperature and a long history at a low temperature, that is, the amount of change in the residual magnetic flux density or residual magnetization is about the same, both are used by using a temperature indicating material. Can be distinguished.
【００１４】本発明においては、使用する磁性体の形状
によって、単位温度あたりの残留磁束密度または残留磁
化の変化量を、すなわち、感度を調整することができ
る。つまり、変化量を大きく設定したい場合、磁極
（Ｎ、Ｓ）間の距離を短くとる、すなわち、反磁界係数
Ｎが大きくなるような形状とすることが好ましい。In the present invention, the amount of change in the residual magnetic flux density or residual magnetization per unit temperature, that is, the sensitivity can be adjusted depending on the shape of the magnetic material used. In other words, when it is desired to set a large amount of change, it is preferable that the distance between the magnetic poles (N, S) is short, that is, the shape is such that the demagnetizing factor N increases.
【００１５】本発明で使用する温度履歴情報を記憶する
磁性体は、強磁性体且つ保磁力が１０Ａ／ｍ以上のハー
ド材料が使用される。材料により温度による前記残留磁
束密度または残留磁化の変化量が異なることから、使用
する温度範囲、要求される判定精度によって適宜最適な
材料を使用するのが好ましい。また、異なる材料を組み
合わせることによって広い温度範囲の履歴情報を記憶す
ることができる。The magnetic material for storing temperature history information used in the present invention is a ferromagnetic material and a hard material having a coercive force of 10 A / m or more. Since the amount of change in the residual magnetic flux density or residual magnetization depending on the temperature differs depending on the material, it is preferable to use an optimal material as appropriate depending on the temperature range to be used and the required determination accuracy. Also, by combining different materials, history information over a wide temperature range can be stored.
【００１６】このような材料としては、特に、２００℃
以上ではサマリウム、コバルトを含む合金磁石が、０℃
以上２００℃未満では、ネオジウム、鉄、ホウ素を含む
合金磁石が、０℃未満ではバリウム・フェライト系磁石
またはストロンチウム・フェライト系磁石が、温度の履
歴情報を蓄積する材料として好ましい。温度範囲の上限
については特に規定はされないが、本発明では変態を伴
わない磁区構造の変化による非可逆的減磁を温度の履歴
情報の記憶手段としているので、使用する材料が変態を
起こさない温度までである。As such a material, particularly, 200 ° C.
In the above, the alloy magnet containing samarium and cobalt is 0 ° C.
When the temperature is lower than 200 ° C., an alloy magnet containing neodymium, iron, and boron is preferable as a material for storing temperature history information. When the temperature is lower than 0 ° C., a barium ferrite magnet or a strontium ferrite magnet is preferable. The upper limit of the temperature range is not particularly defined, but in the present invention, since irreversible demagnetization due to a change in the magnetic domain structure without transformation is used as storage means of temperature history information, the temperature at which the material used does not undergo transformation is Up to.
【００１７】また、磁性体は、その特性を非接触、か
つ、非磁性体で被覆された状態で、その磁気特性を測定
できるので、その全体、または、一部を非磁性体材料で
被覆することで第３者に対してその情報を秘匿したい用
途にも適用可能である。更に、磁性体には電力を供給す
る必要が無いので、小型化が図れる。In addition, since the magnetic properties of the magnetic material can be measured in a state of non-contact and coated with the non-magnetic material, the whole or a part of the magnetic material is coated with the non-magnetic material. Thus, the present invention can be applied to a use in which the information is to be kept secret from a third party. Further, since it is not necessary to supply electric power to the magnetic body, the size can be reduced.
【００１８】[0018]
【実施例】以下に、本発明の実施例について説明する。
なお、本発明は以下に説明する実施例に限定されるもの
ではない。なお、実施例においては、処理を施す前の磁
界強度の絶対値に対する、処理前後での磁界強度の絶対
値の変化量の割合を、磁界強度の変化率と定義した。Embodiments of the present invention will be described below.
The present invention is not limited to the embodiments described below. In the examples, the ratio of the change amount of the absolute value of the magnetic field strength before and after the processing to the absolute value of the magnetic field strength before the processing is defined as the change rate of the magnetic field strength.
【００１９】実施例１〜６ 実施例１では、直径５mm、高さ５mmの円柱状のサマリウ
ム・コバルト系磁石（ＴＤＫ製「ＲＥＣ−３２Ａ」（商
品名））を用いた。この磁石を加熱炉で２００℃、５時
間加熱した後、７日間室温で保持した。次いで、同様に
２００℃で５時間加熱した。更に７日間室温で保持した
後、同様に２００℃で１０時間加熱した。この際、各加
熱工程後、磁石を１時間室温で放置し、ホール素子型磁
界センサを用いて、磁石の底面における磁界強度を測定
した。なお、測定された磁界強度は、磁石の残留磁束密
度に対応する物理量である。また、未加熱時の磁界強度
に対する、加熱前後での磁界強度の変化量の割合を、磁
界強度の変化率と定義した。磁界センサに起因する変化
率の変動幅は、±０．１％程度である。Examples 1 to 6 In Example 1, a cylindrical samarium-cobalt magnet (trade name "REC-32A" (trade name)) having a diameter of 5 mm and a height of 5 mm was used. The magnet was heated in a heating furnace at 200 ° C. for 5 hours, and then kept at room temperature for 7 days. Then, it was similarly heated at 200 ° C. for 5 hours. After keeping at room temperature for further 7 days, it was similarly heated at 200 ° C for 10 hours. At this time, after each heating step, the magnet was left at room temperature for 1 hour, and the magnetic field intensity at the bottom surface of the magnet was measured using a Hall element type magnetic field sensor. Note that the measured magnetic field strength is a physical quantity corresponding to the residual magnetic flux density of the magnet. Further, the ratio of the change amount of the magnetic field strength before and after the heating to the magnetic field strength at the time of non-heating was defined as the change rate of the magnetic field strength. The variation width of the rate of change caused by the magnetic field sensor is about ± 0.1%.
【００２０】実施例２では、直径５mm、高さ５mmの円柱
状のネオジウム・鉄・ホウ素系磁石（ＴＤＫ製「ＮＥＯ
ＲＥＣ−５０」（商品名））を用いた。この磁石を加熱
炉で６０℃、５時間加熱した後、７日間室温で保持し
た。次いで、同様に６０℃で５時間加熱した。更に７日
間室温で保持した後、同様に６０℃で１０時間加熱し
た。この際、各加熱工程後、磁石を１時間室温で放置
し、ホール素子型磁界センサを用いて、磁石の底面にお
ける磁界強度を測定した。In the second embodiment, a cylindrical neodymium / iron / boron magnet having a diameter of 5 mm and a height of 5 mm ("NEO" manufactured by TDK)
REC-50 "(trade name)). The magnet was heated in a heating furnace at 60 ° C. for 5 hours, and then kept at room temperature for 7 days. Then, it was similarly heated at 60 ° C. for 5 hours. After keeping at room temperature for further 7 days, it was similarly heated at 60 ° C. for 10 hours. At this time, after each heating step, the magnet was left at room temperature for 1 hour, and the magnetic field strength at the bottom surface of the magnet was measured using a Hall element type magnetic field sensor.
【００２１】実施例３では、直径５mm、高さ５mmの円柱
状のストロンチウム・フェライト系磁石（ＴＤＫ製「Ｆ
Ｂ６Ｎ」（商品名））を用いた。この磁石を恒温槽で−
２０℃、５時間冷却した後、７日間室温で保持した。次
いで、同様に−２０℃で５時間冷却した。更に７日間室
温で保持した後、同様に−２０℃で５時間冷却した。こ
の際、各加熱工程後、磁石を１時間室温で放置し、ホー
ル素子型磁界センサを用いて、磁石の底面における磁界
強度を測定した。In the third embodiment, a columnar strontium / ferrite-based magnet having a diameter of 5 mm and a height of 5 mm ("FDK" manufactured by TDK Corporation) was used.
B6N "(trade name)). This magnet in a thermostat
After cooling at 20 ° C. for 5 hours, it was kept at room temperature for 7 days. Subsequently, it cooled similarly at -20 degreeC for 5 hours. After keeping at room temperature for further 7 days, it was similarly cooled at -20 ° C for 5 hours. At this time, after each heating step, the magnet was left at room temperature for 1 hour, and the magnetic field strength at the bottom surface of the magnet was measured using a Hall element type magnetic field sensor.
【００２２】実施例４では、実施例３と同じ形状、材質
の磁石を用いた。この磁石を加熱炉で２００℃、５時間
加熱した後、７日間室温で保持した。次いで、同様に２
００℃で５時間加熱した。更に７日間室温で保持した
後、同様に２００℃で１０時間加熱した。この際、各加
熱工程後、磁石を１時間室温で放置し、ホール素子型磁
界センサを用いて、磁石の底面における磁界強度を測定
した。In Example 4, a magnet having the same shape and material as in Example 3 was used. The magnet was heated in a heating furnace at 200 ° C. for 5 hours, and then kept at room temperature for 7 days. Then, similarly,
Heat at 00 ° C. for 5 hours. After keeping at room temperature for further 7 days, it was similarly heated at 200 ° C. for 10 hours. At this time, after each heating step, the magnet was left at room temperature for 1 hour, and the magnetic field strength at the bottom surface of the magnet was measured using a Hall element type magnetic field sensor.
【００２３】実施例５では、実施例３と同じ形状、材質
の磁石を用いた。この磁石を加熱炉で６０℃、５時間加
熱した後、７日間室温で保持した。次いで、同様に６０
℃で５時間加熱した。更に７日間室温で保持した後、同
様に６０℃で１０時間加熱した。この際、各加熱工程
後、磁石を１時間室温で放置し、ホール素子型磁界セン
サを用いて、磁石の底面における磁界強度を測定した。In Example 5, a magnet having the same shape and material as in Example 3 was used. The magnet was heated in a heating furnace at 60 ° C. for 5 hours, and then kept at room temperature for 7 days. Then, as well as 60
Heated at ° C. for 5 hours. After keeping at room temperature for further 7 days, it was similarly heated at 60 ° C. for 10 hours. At this time, after each heating step, the magnet was left at room temperature for 1 hour, and the magnetic field strength at the bottom surface of the magnet was measured using a Hall element type magnetic field sensor.
【００２４】なお、実施例３〜５の処理時間の合計に対
する磁界強度の変化率の変化を図１に示す。この図か
ら、ストロンチウム・フェライト系磁石は低温、特に０
℃未満の温度に対して感度が高いことがわかる。FIG. 1 shows the change in the rate of change of the magnetic field strength with respect to the total processing time in Examples 3 to 5. From this figure, it can be seen that the strontium ferrite magnet has a low temperature,
It can be seen that the sensitivity is high for temperatures lower than ℃.
【００２５】実施例６では、実施例１と同じ形状、材質
の磁石を用いた。この磁石を恒温槽で−２０℃、５時間
冷却した後、７日間室温で保持した。次いで、同様に−
２０℃で５時間冷却した。更に７日間室温で保持した
後、同様に−２０℃で５時間冷却した。この際、各加熱
工程後、磁石を１時間室温で放置し、ホール素子型磁界
センサを用いて、磁石の底面における磁界強度を測定し
た。In Example 6, a magnet having the same shape and material as in Example 1 was used. The magnet was cooled in a thermostat at -20 ° C for 5 hours, and then kept at room temperature for 7 days. Then, similarly-
Cooled at 20 ° C. for 5 hours. After keeping at room temperature for further 7 days, it was similarly cooled at -20 ° C for 5 hours. At this time, after each heating step, the magnet was left at room temperature for 1 hour, and the magnetic field strength at the bottom surface of the magnet was measured using a Hall element type magnetic field sensor.
【００２６】磁石の形状は円柱以外でもよく、例えば、
直方体型、ドーナッツ型、薄膜状など、磁気特性の変化
を測定できる形状であれば、どのような形状でも適用可
能である。実施例１〜６では、磁性体として、強磁性体
かつハード材料である各種磁石を利用したが、これら以
外の磁性体も本発明に利用できる。The shape of the magnet may be other than a cylinder.
Any shape, such as a rectangular parallelepiped shape, a donut shape, or a thin film shape, can be applied as long as a change in magnetic properties can be measured. In Examples 1 to 6, various magnets, which are ferromagnetic and hard materials, were used as the magnetic material, but other magnetic materials can also be used in the present invention.
【００２７】また、測定する磁気特性としては、残留磁
束密度に対応する物理量である磁界強度の変化率を測定
していたが、残留磁化の変化量の測定によっても良い。
また、これらに加えて、透磁率や保磁力など他の磁気的
特性を併用しても良い。これらの物理量を複数利用すれ
ば、精度が高められる。As the magnetic properties to be measured, the rate of change of the magnetic field strength, which is a physical quantity corresponding to the residual magnetic flux density, is measured, but the change of the residual magnetization may be measured.
In addition, other magnetic characteristics such as magnetic permeability and coercive force may be used in combination. The accuracy can be improved by using a plurality of these physical quantities.
【００２８】以上の実施例の結果を表１及び表２に示
す。Tables 1 and 2 show the results of the above examples.
【００２９】[0029]
【表１】 注） *： 加熱または冷却処理を施した時間[Table 1] Note) *: Time of heating or cooling
【００３０】[0030]
【表２】 注） *： 加熱または冷却処理を施した時間[Table 2] Note) *: Time of heating or cooling
【００３１】表１を見て明らかなように、温度の履歴を
磁石に与えることによって、磁石の磁界強度が変化する
ことが分かる。すなわち、磁性体を用いることによっ
て、磁界強度の変化量として温度の履歴情報を記憶でき
る。なお、実施例１〜６では、加熱工程が全て終了後、
１ヶ月経過した後に、磁界強度を測定したが、全加熱工
程の終了後に測定した磁界強度と同じ値を示した。As is clear from Table 1, it can be seen that the magnetic field strength of the magnet changes when the temperature history is given to the magnet. That is, by using a magnetic material, temperature history information can be stored as the amount of change in magnetic field strength. In Examples 1 to 6, after all the heating steps were completed,
After a lapse of one month, the magnetic field strength was measured, and showed the same value as the magnetic field strength measured after the completion of the entire heating step.
【００３２】比較例１ 示温材（日油技研工業製「ＬＩ−２００」（商品名））
を加熱炉で２００℃、５時間加熱した後、７日間室温で
保持した。次いで、２００℃で５時間加熱した。しかし
ながら、示温材が最初の５時間の加熱の際に分解してし
まった。なお、加熱時間が３分の場合は、示温材が淡黄
色から黒色に変化したが、それから示温材が分解するま
で、黒色のまま変化しなかった。Comparative Example 1 Temperature indicating material ("LI-200" (trade name) manufactured by NOF Engineering Co., Ltd.)
Was heated in a heating furnace at 200 ° C. for 5 hours, and then kept at room temperature for 7 days. Then, it was heated at 200 ° C. for 5 hours. However, the temperature indicating material decomposed during the first 5 hours of heating. When the heating time was 3 minutes, the temperature indicating material changed from light yellow to black, but remained black until the temperature indicating material was decomposed.
【００３３】比較例２ 示温材（日油技研工業製「ＬＩ−６０」（商品名））を
加熱炉で６０℃、５時間加熱した後、７日間室温で保持
した。次いで、６０℃で５時間加熱した。この時、最初
の５時間の加熱で、示温材が白色から緑色に変化した。
残りの５時間の加熱では、黒色のまま変化はなかった。Comparative Example 2 A temperature indicating material ("LI-60" (trade name) manufactured by NOF Engineering Co., Ltd.) was heated in a heating furnace at 60 ° C. for 5 hours, and then kept at room temperature for 7 days. Subsequently, it heated at 60 degreeC for 5 hours. At this time, the temperature indicating material changed from white to green by the first heating for 5 hours.
The remaining 5 hours of heating remained black and did not change.
【００３４】以上のように、比較例１，２では、所定の
温度に達したことは判断できるが、その時間について情
報を得ることができない。これに対し、実施例１〜６で
は、所定の温度に曝された時間の合計、すなわち、温度
の履歴情報を記憶することができる。As described above, in Comparative Examples 1 and 2, it can be determined that the temperature has reached the predetermined temperature, but no information can be obtained on the time. On the other hand, in the first to sixth embodiments, the total time of exposure to the predetermined temperature, that is, the temperature history information can be stored.
【００３５】[0035]
【発明の効果】本発明により、広い温度領域に対応し、
効率的で簡便な温度の履歴情報の記憶が可能となる。According to the present invention, it is possible to cope with a wide temperature range,
Efficient and simple storage of temperature history information becomes possible.
【図１】実施例３〜５の処理時間の合計に対する磁界強
度の変化率の変化を示すグラフである。FIG. 1 is a graph showing a change in a change rate of a magnetic field intensity with respect to a total of processing times in Examples 3 to 5.
Claims (15)
構造の変化による非可逆的減磁により記憶することを特
徴とする、温度の履歴情報の記憶方法。1. A method for storing temperature history information, wherein a history of ambient temperature changes is stored by irreversible demagnetization due to a change in the magnetic domain structure of the magnetic body.
Ａ／ｍ以上のハード材料であることを特徴とする、請求
項１記載の温度の履歴情報の記憶方法。2. The method according to claim 1, wherein the magnetic material is a ferromagnetic material and has a coercive force of 10.
2. The method of storing temperature history information according to claim 1, wherein the material is a hard material of A / m or more.
の変化による物理量であることを特徴とする請求項１ま
たは２に記載の温度の履歴情報の記憶方法。3. The method according to claim 1, wherein the irreversible demagnetization is a physical quantity due to a change in magnetic flux density or magnetization.
とを特徴とする、請求項３記載の温度の履歴情報の記憶
方法。4. The method according to claim 3, wherein the magnetic flux density is a residual magnetic flux density.
とする、請求項３記載の温度の履歴情報の記憶方法。5. The method according to claim 3, wherein the magnetization is a residual magnetization.
ことを特徴とする、請求項１〜５のいずれか１項記載の
温度の履歴情報の記憶方法。6. The method for storing temperature history information according to claim 1, wherein the ambient temperature is 200 ° C. or higher.
含む合金磁石であることを特徴とする請求項１〜６のい
ずれか１項記載の温度の履歴情報の記憶方法。7. The method according to claim 1, wherein the magnetic material is an alloy magnet containing samarium and cobalt.
満であることを特徴とする、請求項１〜５のいずれか１
項記載の温度の履歴情報の記憶方法。8. The method according to claim 1, wherein said ambient temperature is not lower than 0 ° C. and lower than 200 ° C.
Storage method of temperature history information described in section.
を含む合金磁石であることを特徴とする請求項１〜５，
８のいずれか１項記載の温度の履歴情報の記憶方法。9. The magnetic material according to claim 1, wherein the magnetic material is an alloy magnet containing neodymium, iron, and boron.
9. The method of storing temperature history information according to any one of items 8 to 8.
とを特徴とする、請求項１〜５のいずれか１項記載の温
度の履歴情報の記憶方法。10. The method according to claim 1, wherein the ambient temperature is lower than 0 ° C.
系磁石、または、ストロンチウム・フェライト系磁石で
あることを特徴とする、請求項１〜５，１０のいずれか
１項記載の温度の履歴情報の記憶方法。11. The temperature history information according to claim 1, wherein the magnetic material is a barium ferrite magnet or a strontium ferrite magnet. Memory method.
よって、非可逆的減磁の感度を調整することを特徴とす
る請求項１〜１１のいずれか１項に記載の温度の履歴情
報の記憶方法。12. The temperature history information according to claim 1, wherein sensitivity of irreversible demagnetization is adjusted by controlling a demagnetizing factor of the magnetic material. Memory method.
部を非磁性体材料により被覆されていることを特徴とす
る請求項１〜１２のいずれか１項に記載の温度の履歴情
報の記憶方法。13. The temperature history information according to claim 1, wherein the magnetic material is entirely or partially coated with a nonmagnetic material. Memory method.
て表示可能な示温材料を併用することを特徴とする請求
項１〜１２のいずれか１項に記載の温度の履歴情報の記
憶方法。14. The method of storing temperature history information according to claim 1, wherein a temperature indicating material capable of displaying the highest or lowest attainable temperature by discoloration is used in combination.
間の合計であることを特徴とする、請求項１〜１４のい
ずれか１項記載の温度の履歴情報の記憶方法。15. The method of storing temperature history information according to claim 1, wherein the history is a total time of exposure to a specific temperature.
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003057123A (en) * | 2001-08-08 | 2003-02-26 | Central Res Inst Of Electric Power Ind | Method for estimating attaining temperature of high- temperature member nondestructively |
| JP2005214909A (en) * | 2004-02-02 | 2005-08-11 | Osaka Sealing Printing Co Ltd | Temperature-sensing member and temperature-sensing method |
| JP2005308565A (en) * | 2004-04-22 | 2005-11-04 | Osaka Sealing Printing Co Ltd | Temperature sensing member, temperature sensing device and temperature sensing method |
| CN105486427A (en) * | 2015-11-30 | 2016-04-13 | 湘潭电机股份有限公司 | Permanent magnet motor permanent magnet body temperature rise calculating method |
-
1998
- 1998-12-25 JP JP37132798A patent/JP3159258B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003057123A (en) * | 2001-08-08 | 2003-02-26 | Central Res Inst Of Electric Power Ind | Method for estimating attaining temperature of high- temperature member nondestructively |
| JP4693084B2 (en) * | 2001-08-08 | 2011-06-01 | 財団法人電力中央研究所 | Nondestructive method for estimating the temperature reached by a high-temperature member |
| JP2005214909A (en) * | 2004-02-02 | 2005-08-11 | Osaka Sealing Printing Co Ltd | Temperature-sensing member and temperature-sensing method |
| JP4563690B2 (en) * | 2004-02-02 | 2010-10-13 | 大阪シーリング印刷株式会社 | Temperature sensing material and temperature sensing method |
| JP2005308565A (en) * | 2004-04-22 | 2005-11-04 | Osaka Sealing Printing Co Ltd | Temperature sensing member, temperature sensing device and temperature sensing method |
| CN105486427A (en) * | 2015-11-30 | 2016-04-13 | 湘潭电机股份有限公司 | Permanent magnet motor permanent magnet body temperature rise calculating method |
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