JP2649756B2 - Magnetic recording medium and method of manufacturing the same - Google Patents
Magnetic recording medium and method of manufacturing the sameInfo
- Publication number
- JP2649756B2 JP2649756B2 JP4175930A JP17593092A JP2649756B2 JP 2649756 B2 JP2649756 B2 JP 2649756B2 JP 4175930 A JP4175930 A JP 4175930A JP 17593092 A JP17593092 A JP 17593092A JP 2649756 B2 JP2649756 B2 JP 2649756B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic layer
- recording
- weight
- parts
- 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 - Fee Related
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000000696 magnetic material Substances 0.000 claims description 20
- 239000003973 paint Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 14
- 238000010030 laminating Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 113
- 238000000576 coating method Methods 0.000 description 40
- 239000011248 coating agent Substances 0.000 description 38
- 238000000034 method Methods 0.000 description 23
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 18
- 239000000203 mixture Substances 0.000 description 17
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 15
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 9
- 229920001577 copolymer Polymers 0.000 description 9
- 229920005749 polyurethane resin Polymers 0.000 description 8
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 7
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 7
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 7
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 7
- 239000006229 carbon black Substances 0.000 description 7
- 229940067606 lecithin Drugs 0.000 description 7
- 235000010445 lecithin Nutrition 0.000 description 7
- 239000000787 lecithin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 229920001228 polyisocyanate Polymers 0.000 description 6
- 239000005056 polyisocyanate Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 239000011247 coating layer Substances 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000007650 screen-printing Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 3
- 229920006267 polyester film Polymers 0.000 description 3
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 description 2
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- GQVCNZBQZKXBMX-UHFFFAOYSA-N butan-2-one;toluene Chemical compound CCC(C)=O.CC1=CC=CC=C1 GQVCNZBQZKXBMX-UHFFFAOYSA-N 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229910000702 sendust Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000012463 white pigment Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Credit Cards Or The Like (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は買物カード、預貯金カー
ド、定期券、乗車券、回数券、プリペイドカード、キャ
シュカード、クレジットカード、ポイントカード、身分
証明書、診察券等において、生産性が高く偽造し難い磁
気記録媒体およびその製造方法を提供するものである。The present invention has high productivity in shopping cards, savings and savings cards, commuter passes, tickets, coupons, prepaid cards, cash cards, credit cards, point cards, identification cards, medical examination tickets, etc. An object of the present invention is to provide a magnetic recording medium that is difficult to forge and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】近時、磁気記録を行なったカード類が前
記のような利用分野で広く用いられ、ますますその用途
が拡大してきている。その基本構造は非磁性体からなる
基体の上に、磁性体の層を設け、これを磁化したもので
ある。かかる磁気記録媒体は、磁気情報の複製や改ざん
により不正使用が発生するのを防止することが必要で、
このため種々の不正使用防止策がとられている。代表的
な偽造変造防止法としては、磁気記録情報の記録，再生
を困難にする方法と、磁気カードそのものに真偽判定情
報を持たせる方法とに大別される。前者は記録された磁
気情報を隠蔽し、情報の書込み，読み取りを難しくする
ことにより磁気情報の改ざんや複製を困難にする方法で
あり、後者は磁気カードが正規のものか否かを判定する
ための識別情報をカードそのものに入れておくことによ
り偽造、変造を防ぐ方法である。2. Description of the Related Art Recently, cards on which magnetic recording has been performed have been widely used in the above-mentioned fields of use, and the applications thereof have been increasing. The basic structure is such that a magnetic layer is provided on a base made of a non-magnetic substance and magnetized. Such magnetic recording media need to prevent unauthorized use due to duplication or falsification of magnetic information,
For this reason, various measures for preventing unauthorized use have been taken. Typical forgery / falsification prevention methods are roughly classified into a method of making recording and reproduction of magnetic recording information difficult, and a method of providing the magnetic card itself with authenticity determination information. The former is a method of hiding recorded magnetic information and making it difficult to write or read information, thereby making it difficult to falsify or duplicate magnetic information. The latter is a method for determining whether a magnetic card is genuine. This is a method of preventing forgery and falsification by putting the identification information of the card in the card itself.
【０００３】[0003]
【発明が解決しようとする課題】磁気記録情報の記録，
再生を困難にすることによる不正使用防止策として知ら
れているものには、磁気記録部を多層化することによ
り、正規の情報を隠蔽して読み取り不能にしたり、ダミ
ー情報を重畳して正規の情報の解析を困難にするもので
あるが、何分にも製造工程が複雑であり、かつ記録の書
き込み読み出し装置が複雑になる等の欠点があり、又、
一旦情報の隠蔽する方法の詳細が判明してしまえば、磁
気記録に詳しい者であれば、情報を読み出し、解析する
ことが可能であるので複製や変造を防ぎ切れない可能性
がある。磁気カードそのものに真偽判定情報を施したカ
ードは正しい判定情報を持った正規のカードでなけれ
ば、例え磁気情報の偽造ができたとしても実際に使用で
きないが、この方法も製造工程が複雑で、判定情報の読
み出し装置が複雑になるという欠点がある。又、正規の
カードの磁気情報が変造された場合は不正使用を防ぎ切
れないと云う問題がある。本発明は前記従来の技術の有
する課題を解決することを目的とする。SUMMARY OF THE INVENTION Magnetic recording information recording,
Known measures for preventing unauthorized use by making reproduction difficult include multi-layered magnetic recording sections to hide legitimate information and make it unreadable, or to superimpose dummy information to supervise legitimate information. Although this makes information analysis difficult, it has drawbacks such as complicated manufacturing processes and complicated recording / reading devices.
Once the details of the method of concealing the information are known, anyone familiar with magnetic recording can read and analyze the information, so that duplication and alteration may not be prevented. If the magnetic card itself is not a legitimate card with the correct judgment information, the card cannot be actually used even if the magnetic information can be forged, but this method also requires a complicated manufacturing process. However, there is a disadvantage that the reading device of the determination information becomes complicated. Further, if the magnetic information of a legitimate card is altered, unauthorized use cannot be prevented. An object of the present invention is to solve the problems of the conventional technology.
【０００４】[0004]
【課題を解決するための手段】本発明の概要は、非磁性
体からなる基体の上に２５０エルステッド〜４０００エ
ルステッドの保磁力の磁性体からなる第１の磁性層と、
１００エルステッド以下の低保磁力の磁性体からなり、
後で追加も消去も不可能な情報が記録されてなる第２の
磁性層を順次積層したことを特徴とする磁気記録媒体
（請求項１）および、非磁性体からなる基体の上に２５
０エルステッド〜４０００エルステッドの保磁力の磁性
体からなる磁気塗料を塗布、乾燥することにより第１の
磁性層を形成し、ついで該磁性層に磁気記録を行ない、
しかる後、１００エルステッド以下の低保磁力の磁性体
からなる磁気塗料を塗布、乾燥することにより第２の磁
性層を形成することを特徴とする磁気記録媒体の製造方
法（請求項２）である。SUMMARY OF THE INVENTION The present invention comprises a first magnetic layer made of a magnetic material having a coercive force of 250 Oersted to 4000 Oersted on a base made of a nonmagnetic material;
It is made of a magnetic material having a low coercive force of 100 Oersted or less,
A magnetic recording medium (Claim 1) characterized by sequentially laminating a second magnetic layer on which information that cannot be added or erased later is recorded, and 25 on a non-magnetic substrate.
A first magnetic layer is formed by applying and drying a magnetic paint composed of a magnetic material having a coercive force of 0 Oersted to 4000 Oersted, and then performing magnetic recording on the magnetic layer;
Thereafter, a second magnetic layer is formed by applying and drying a magnetic paint made of a magnetic material having a low coercive force of 100 Oe or less, and forming a second magnetic layer (claim 2). .
【０００５】以下図面を参照しつゝ本発明を説明する。
図１（イ）は本発明による磁気記録媒体（カード）の平
面図で、磁気記録トラックＴを有する。図１（ロ）はト
ラックＴのＸ−Ｘ線断面図で非磁性層からなる基体１の
上に２５０エルステッド〜４０００エルステッドの保磁
力の磁性体からなる第１の磁性層２、１００エルステッ
ド以下の低保磁力磁性体からなり追加も消去もしがたい
情報が記録された第２の磁性層３、必要によりさらに被
覆層（図示せず）が積層されて本発明の磁気記録媒体を
構成してもよい。図１（ロ）の第１の磁性層と第２の磁
性層の磁化後の状態は図１（ハ）のように、第１の磁性
層の記録パターンの磁気反転部界面に第２の磁性層の塗
料が集まるため、本図のような構造となり、これが磁気
バーコード状パターンとして固定される。次に本発明の
磁気記録媒体を構成する材料について述べる。先ず非磁
性体からなる基体としては、厚さ１５０μｍ〜１ｍｍの
ポリエステルフィルム、塩化ビニルフィルム、合成紙、
木材パルプ紙、ラミネート紙等のシート状の非磁性体が
適用できる。第１の磁性層に用いる磁性体としては、γ
−酸化鉄，コバルトドープのγ−酸化鉄，酸化クロム，
バリウムフェライト，ストロンチウムフェライト等が適
用され、これらの磁性体を塩化ビニル・酢酸ビニル共重
合体，塩化ビニル・酢酸ビニル・ビニルアルコール共重
合体，ポリウレタン樹脂，ポリエステル樹脂，エポキシ
樹脂，ポリイソシアネート樹脂等の結着剤に顔料等他の
添加剤とともに分散した塗液を基体上に塗布することに
よって第１の磁性層を形成することができる。又、第２
の磁性層に用いる磁性体としては、カルボニル鉄粉，マ
ンガンジンクフェライト，ニッケル粉，四三酸化鉄，パ
ーマロイ，センダスト、アルパーム等が適用され、これ
らの磁性体を前記第１の磁性層に用いると同様の結着剤
に顔料等他の添加剤とともに分散した塗液を第１の磁性
層上に塗布することによって第２の磁性層を形成するこ
とができる。又、前記第２の磁性層の上に必要に応じて
設ける被覆層は、 （ａ）前記磁性層の着色を隠蔽するためのアルミニウム
粉末，白色顔料等を含んだ着色層 （ｂ）ロイコ染料型感熱記録層，錫，アルミニウム等の
金属蒸着層からなる放電記録層等の印字記録層 （ｃ）紫外線硬化型樹脂からなる保護層 のうちの１層もしくは複数層を順次積層して形成するこ
とができる。The present invention will be described below with reference to the drawings.
FIG. 1A is a plan view of a magnetic recording medium (card) according to the present invention, and has a magnetic recording track T. FIG. FIG. 1B is a sectional view taken along the line XX of the track T. A first magnetic layer 2 made of a magnetic material having a coercive force of 250 Oersted to 4000 Oersted is formed on a substrate 1 made of a nonmagnetic layer. The second magnetic layer 3, which is made of a low coercive force magnetic material and on which information that cannot be added or erased, is recorded, and if necessary, a coating layer (not shown) is further laminated to constitute the magnetic recording medium of the present invention. Good. The state after magnetization of the first magnetic layer and the second magnetic layer in FIG. 1 (b) is shown in FIG. 1 (c). Since the paint of the layers is collected, the structure as shown in this figure is obtained, and this is fixed as a magnetic barcode-like pattern. Next, the material constituting the magnetic recording medium of the present invention will be described. First, as a substrate made of a nonmagnetic material, a polyester film having a thickness of 150 μm to 1 mm, a vinyl chloride film, synthetic paper,
A sheet-like non-magnetic material such as wood pulp paper or laminated paper can be used. As the magnetic material used for the first magnetic layer, γ
-Iron oxide, cobalt-doped γ-iron oxide, chromium oxide,
Barium ferrite, strontium ferrite, etc. are applied, and these magnetic substances are converted to vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinyl acetate / vinyl alcohol copolymer, polyurethane resin, polyester resin, epoxy resin, polyisocyanate resin, etc. The first magnetic layer can be formed by applying a coating solution in which a binder and other additives such as a pigment are dispersed on a substrate. Also, the second
As the magnetic material used for the magnetic layer of the above, carbonyl iron powder, manganese zinc ferrite, nickel powder, triiron tetroxide, permalloy, sendust, alpalm, etc. are applied. When these magnetic materials are used for the first magnetic layer, The second magnetic layer can be formed by applying a coating solution in which a similar binder is dispersed together with another additive such as a pigment on the first magnetic layer. The coating layer provided as required on the second magnetic layer includes: (a) a colored layer containing aluminum powder, a white pigment, and the like for concealing the coloring of the magnetic layer; and (b) a leuco dye type. A print recording layer such as a heat-sensitive recording layer, a discharge recording layer formed of a metal deposited layer of tin, aluminum or the like, and (c) one or more layers of a protective layer formed of an ultraviolet curable resin may be sequentially laminated. it can.
【０００６】本発明の製造方法について説明すれば、例
えば図２に示すように非磁性体からなる基体１を送り出
しリール１１より送り出し、第１の磁性層用の塗料の塗
布装置１２に導いて塗工する。塗工ヘッド１３で塗布さ
れた基体１はロール１４を経て磁場配向装置１５、乾燥
パート１６、ロール１７を経て巻取りリール１８に巻き
取られる。巻き取られた製品は第１の磁性層のみが塗布
された原反である。なお第１の磁性層は磁場配向を行な
うことが好ましいがこれを行なわなくてもよい。次に図
３に示すように第１の磁性層用塗料のみが塗布された原
反の巻取りリールを送り出しリール１９として、磁気ヘ
ッド２０で第１の磁性層に情報を磁気記録した後、第２
の磁性層用の塗料の塗布装置２１に導き塗工ヘッド２２
で塗工し、ロール２３、乾燥パート２４、ロール２５を
経て巻取りリール２６に本発明による磁気記録媒体を巻
取るようになっている。なお被覆層を設ける場合は、こ
れを別途被覆層用塗料の塗布装置を介して塗布巻取れば
容易に実施できる（図示しない）。The manufacturing method of the present invention will be described. For example, as shown in FIG. 2, a base 1 made of a non-magnetic material is sent out from a feed reel 11 and guided to a coating device 12 for coating a first magnetic layer. Work. The substrate 1 applied by the coating head 13 is wound on a take-up reel 18 via a magnetic field orientation device 15, a drying part 16, and a roll 17 via a roll 14. The wound product is a raw material coated with only the first magnetic layer. It is preferable that the first magnetic layer be oriented in a magnetic field, but this need not be performed. Next, as shown in FIG. 3, information is magnetically recorded on the first magnetic layer by the magnetic head 20 using the take-up reel 19 of the raw material to which only the first magnetic layer paint is applied as the take-out reel 19. 2
The coating head 22 is guided to a coating device 21 for coating a magnetic layer.
The magnetic recording medium according to the present invention is wound on a take-up reel 26 via a roll 23, a drying part 24, and a roll 25. In the case where a coating layer is provided, it can be easily implemented by separately applying and winding this through a coating device for coating material for the coating layer (not shown).
【０００７】上記の方法に於いて、第１の磁性層は２５
０エルステッド〜４０００エルステッドの通常の磁気記
録媒体と同程度の保磁力であるから、磁性層形成後は容
易に磁気記録用ヘッドで磁気記録することができる。２
５０エルステッド未満では磁気記録後外部磁場により消
去されるという問題を生じ、４０００エルステッドを超
えて大きいと現在実用化されている磁気ヘッドの磁気記
録が不可能となる。又第２の磁性層の磁性体の保磁力は
１００エルステッド以下の低保磁力であるが、１００エ
ルステッドを超えて大きいと磁性塗料が図１（ハ）のよ
うに集合しにくい、マグネチックビュアで着磁状態が識
別されるという問題を生ずる。In the above method, the first magnetic layer has a thickness of 25.
Since the coercive force is about the same as that of a normal magnetic recording medium of 0 Oersted to 4000 Oersted, magnetic recording can be easily performed by a magnetic recording head after the formation of the magnetic layer. 2
If it is less than 50 Oe, there is a problem that it is erased by an external magnetic field after the magnetic recording. If it exceeds 4000 Oe, magnetic recording of a magnetic head currently in practical use becomes impossible. Also, the coercive force of the magnetic material of the second magnetic layer is a low coercive force of 100 Oe or less, but if it is larger than 100 Oe, the magnetic paint is difficult to assemble as shown in FIG. This causes a problem that the magnetized state is identified.
【０００８】本発明に於いて、第２の磁性層を構成する
磁性塗料を第１の磁性層に積層するように塗布すると、
塗布直後の第２の磁性層が乾燥する前の状態では、先に
行なった第１の磁性層の磁気記録パターンが転写し、同
じ磁気記録パターン状に低保磁力磁性体が集合する。続
いてこの第２の磁性層を乾燥させると、１００エルステ
ッド以下の低保磁力磁性体からなるバーコード上のパタ
ーンが固定化されたこととなり、通常用いられる磁気ヘ
ッドでは後での追加記録も消去もできない、不正使用防
止情報として使うことのできる情報を媒体に与えること
ができる。この情報は第１の磁気記録情報を転写させる
方法により記録されるため、情報の記録パターンは第１
の磁性層への記録パターンに依存する。すなわち通常の
磁気バーコード等は個々のカードそれぞれに異なった情
報を持たせることは不可能であるが、本発明による方法
は、第１の磁性層に記録するパターンを個々のカードに
対応して異なったものとすれば、個々のカードに異なっ
た判定情報を付与することが可能である。In the present invention, when the magnetic paint constituting the second magnetic layer is applied so as to be laminated on the first magnetic layer,
Immediately after the application, before the second magnetic layer dries, the magnetic recording pattern of the first magnetic layer, which has been performed earlier, is transferred, and the low coercivity magnetic material is assembled in the same magnetic recording pattern. Subsequently, when the second magnetic layer was dried, the pattern on the bar code made of a low coercive force magnetic material of 100 Oe or less was fixed. It is possible to provide the medium with information that cannot be used and that can be used as unauthorized use prevention information. Since this information is recorded by the method of transferring the first magnetic recording information, the information recording pattern is the first magnetic recording information.
Depends on the recording pattern on the magnetic layer. That is, it is impossible for a normal magnetic barcode or the like to have different information on each individual card, but the method according to the present invention uses a pattern recorded on the first magnetic layer in accordance with each individual card. If it is different, it is possible to give different judgment information to each card.
【０００９】[0009]
【実施例】以下本発明の実施例について述べる。 実施例１ 第１の磁性層の塗料を以下の配合で調製した。 バリウムフェライト ＢａＯ・６Ｆｅ2 Ｏ3 １００重量部 （ 保磁力２７５０エルステッド 比表面積８ｍ2 ／ｇ） カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 トルエン ６０重量部 メチルエチルケトン ６０重量部 メチルイソブチルケトン ６０重量部 からなる混合物をボールミルで８時間分散した後、ポリ
イソシアネート樹脂５重量部を添加し、更に１時間分散
を行い、第１の磁性層用塗料を得た。塗布は通常の磁気
記録媒体の製造方法に従って行えばよい。即ち図２に示
したように、１８８μｍ厚さの白色ポリエステルフィル
ムに塗工ヘッド部で前記磁性層用塗料を塗布し、乾燥パ
ート中で乾燥させ、１２μｍ厚さの磁性層を形成し、磁
気原反として巻取る。第１の磁性層用塗料の塗布を行う
とき、乾燥パートに入る前に磁場配向を行うことが好ま
しいが、磁場配向処理を行わなくとも良い。Embodiments of the present invention will be described below. Example 1 A paint for the first magnetic layer was prepared with the following composition. Barium ferrite BaO · 6Fe 2 O 3 100 weight parts (coercive force 2750 Oe specific surface 8m 2 / g) Carbon black 3 parts by weight of lecithin, 1 part by weight vinyl acetate-vinyl alcohol copolymer chloride polymer 20 parts by weight Polyurethane resin 20 weight Parts of toluene 60 parts by weight methyl ethyl ketone 60 parts by weight A mixture of 60 parts by weight methyl isobutyl ketone was dispersed by a ball mill for 8 hours, 5 parts by weight of a polyisocyanate resin was added, and the mixture was further dispersed for 1 hour. Paint was obtained. The coating may be performed according to a usual method for manufacturing a magnetic recording medium. That is, as shown in FIG. 2, the coating material for the magnetic layer was applied to a 188 μm thick white polyester film by a coating head and dried in a drying part to form a 12 μm thick magnetic layer. Wind up as anti. When applying the first magnetic layer coating material, it is preferable to perform the magnetic field orientation before entering the drying part, but it is not necessary to perform the magnetic field orientation treatment.
【００１０】ついで、第２の磁性層用の塗料を以下の配
合で調製した。 カルボニル鉄粉 １００重量部 （保磁力１０エルステッド 比表面積１ｍ2 ／ｇ） カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 トルエン ６０重量部 メチルエチルケトン ６０重量部 メチルイソブチルケトン ６０重量部 からなる混合物をボールミルで８時間分散した後、ポリ
イソシアネート樹脂５重量部を添加し、更に１時間分散
を行い、第２の磁性層用塗料を得た。塗布は第１の磁性
層を形成した磁気原反に、第１の磁性層に積層する形で
第２の磁性層用の塗料を塗布する。塗布は第１の磁性層
を形成するのと同様に行えばよい。但し図３に示したよ
うに、第２の磁性層用塗料を塗布する前に、第１の磁性
層に磁気ヘッドを用いて予め磁気記録を行う。磁気記録
はヘッドギャップ５０μｍの磁気ヘッド２０を用い、第
１の磁性層を充分に飽和記録できる記録電流で記録を行
った。記録は１００ｂｐｉのＦＭ方式で行った。次いで
図３に示したように、塗工ヘッド部で第２の磁性層用塗
料を塗布し、乾燥パート中で乾燥させ、６μｍ厚さの第
２の磁性層を形成し、本発明の磁気記録媒体として巻取
る。このようにして得た本発明による磁気記録媒体か
ら、ＪＩＳサイズの磁気カードを打ち抜き以下の評価を
行った。Next, a paint for the second magnetic layer was prepared with the following composition. Carbonyl iron powder 100 parts by weight (coercive force 10 Oersted specific surface area 1 m 2 / g) Carbon black 3 parts by weight Lecithin 1 part by weight Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts by weight Polyurethane resin 20 parts by weight Toluene 60 parts by weight After a mixture consisting of 60 parts by weight of methyl ethyl ketone and 60 parts by weight of methyl isobutyl ketone was dispersed by a ball mill for 8 hours, 5 parts by weight of a polyisocyanate resin was added, and the mixture was further dispersed for 1 hour to obtain a second magnetic layer paint. The coating is performed by applying a coating material for the second magnetic layer on the magnetic raw material on which the first magnetic layer is formed, in a form of being laminated on the first magnetic layer. The application may be performed in the same manner as when forming the first magnetic layer. However, as shown in FIG. 3, before applying the coating material for the second magnetic layer, magnetic recording is performed in advance on the first magnetic layer using a magnetic head. The magnetic recording was performed using a magnetic head 20 having a head gap of 50 μm and a recording current capable of sufficiently recording the first magnetic layer in saturation. Recording was performed by the 100 bpi FM method. Next, as shown in FIG. 3, a second magnetic layer paint is applied by a coating head portion and dried in a drying part to form a second magnetic layer having a thickness of 6 μm. Take up as a medium. From the magnetic recording medium according to the present invention thus obtained, a JIS size magnetic card was punched out and evaluated as follows.
【００１１】即ち、塗工時に第１の磁性層に記録を行っ
た後図１（ロ）に示すように第２の磁性層を形成した部
分に、図１（イ）のトラックＴ上を３０００エルステッ
ドの磁性層を飽和記録できる記録条件で直流消去を行っ
た後、再生用磁気ヘッドで５００ガウスのバイアス磁界
をかけながら情報の読み出しを行ったところ、第１の磁
性層に記録された情報は消去されたが、第２の磁性層に
は第１の磁性層の記録情報が転写、固定化しており、こ
の情報は消去されないため、読み出すことができた。
又、この磁気カードのトラックＴ以外の部分に３０００
エルステッドまでの保磁力を持つ磁性層に記録、消去で
きる磁気ヘッドで１００ｂｐｉの記録密度でＦＭ方式で
記録を行なったところ、通常に記録，再生できた。すな
わち通常の磁気カードとして使用できた。That is, after recording is performed on the first magnetic layer at the time of coating, the portion where the second magnetic layer is formed as shown in FIG. After DC erasing was performed under recording conditions that allowed saturation recording of the Oersted magnetic layer, information was read out while applying a bias magnetic field of 500 Gauss with a reproducing magnetic head, and the information recorded on the first magnetic layer was Although the information was erased, the recorded information of the first magnetic layer was transferred and fixed to the second magnetic layer, and this information was not erased, so that the information could be read.
Also, 3000 parts are added to the magnetic card other than the track T.
Recording was performed by the FM method at a recording density of 100 bpi with a magnetic head capable of recording and erasing on a magnetic layer having a coercive force up to Oersted. That is, it could be used as a normal magnetic card.
【００１２】実施例２ 第１の磁性層の塗料として以下の配合を調製したほかは
実施例１と同様にして、本発明の磁気記録媒体を作成し
た。 γ酸化鉄 １００重量部 （保磁力３００エルステッド 比表面積２０ｍ2 ／ｇ） カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 トルエン ６０重量部 メチルエチルケトン ６０重量部 メチルイソブチルケトン ６０重量部 このようにして得た本発明の磁気記録媒体から、ＪＩＳ
サイズの磁気カードを打ち抜き実施例１と同様な評価を
行ったところ、実施例１と同様な結果を得た。また、こ
の磁気カードのトラックＴ以外の部分に３０００エルス
テッドまでの保磁力を持つ磁性層に記録、消去できる磁
気ヘッドで１００ｂｐｉの記録密度でＦＭ方式で記録を
行なったところ、通常に記録，再生できた。すなわち通
常の磁気カードとして使用できた。Example 2 A magnetic recording medium of the present invention was prepared in the same manner as in Example 1 except that the following composition was prepared as a coating material for the first magnetic layer. 100 parts by weight of gamma iron oxide (coercive force 300 Oersted, specific surface area 20 m 2 / g) 3 parts by weight of carbon black 1 part by weight of lecithin 20 parts by weight of vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts by weight of polyurethane resin 60 parts by weight of toluene Methyl ethyl ketone 60 parts by weight Methyl isobutyl ketone 60 parts by weight From the magnetic recording medium of the present invention thus obtained, JIS
When a magnetic card having a size was punched out and evaluated in the same manner as in Example 1, the same result as in Example 1 was obtained. Further, when recording was performed by a magnetic head at a recording density of 100 bpi with a magnetic head capable of recording and erasing data on a magnetic layer having a coercive force of up to 3000 Oersted on a portion other than the track T of the magnetic card, it was possible to perform normal recording and reproduction. Was. That is, it could be used as a normal magnetic card.
【００１３】実施例３ 第１の磁性層の塗料を以下の配合で調製した。 バリウムフェライト ＢａＯ・６Ｆｅ2 Ｏ3 １００重量部 （保磁力２７５０エルステッド 比表面積８ｍ2 ／ｇ） カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 トルエン ６０重量部 メチルエチルケトン ６０重量部 メチルイソブチルケトン ６０重量部 からなる混合物をボールミルで８時間分散した後、ポリ
イソシアネート樹脂５重量部を添加し、更に１時間分散
を行い、第１の磁性層用塗料を得た。塗布は通常の磁気
記録媒体の製造方法に従って行えばよい。即ち図２に示
したように、１８８μｍ厚さの白色ポリエステルフィル
ムに塗工ヘッド部で前記第１の磁性層用塗料を塗布し、
塗料を乾燥する前に磁場配向処理を行い、乾燥装置中で
乾燥させ、１２μｍ厚さの磁性層を形成し、磁気原反と
して巻取った。塗布を行うとき、前記第１の磁性層は磁
場配向を行うことが好ましいが、磁場配向処理を行わな
くとも良い。ついで、この磁気原反をシート状に裁断し
た。続いてこの磁気シートに、磁気記録装置を用いて磁
気記録を行った。即ちヘッドギャップ５０μｍの磁気ヘ
ッドを用い、第１の磁性層を充分に飽和記録できる記録
電流で記録を行った。記録は１００ｂｐｉのＦＭ方式で
行った。Example 3 A paint for the first magnetic layer was prepared with the following composition. Barium ferrite BaO · 6Fe 2 O 3 100 parts by weight (coercive force 2750 Oersted specific surface area 8 m 2 / g) Carbon black 3 parts by weight Lecithin 1 part by weight Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts by weight Polyurethane resin 20 parts by weight Parts of toluene 60 parts by weight methyl ethyl ketone 60 parts by weight A mixture of 60 parts by weight methyl isobutyl ketone was dispersed by a ball mill for 8 hours, 5 parts by weight of a polyisocyanate resin was added, and the mixture was further dispersed for 1 hour. Paint was obtained. The coating may be performed according to a usual method for manufacturing a magnetic recording medium. That is, as shown in FIG. 2, the first magnetic layer coating material was applied to a 188 μm thick white polyester film with a coating head portion,
Before the coating was dried, it was subjected to a magnetic field orientation treatment, dried in a drying apparatus to form a magnetic layer having a thickness of 12 μm, and wound as a magnetic substrate. When performing the coating, the first magnetic layer is preferably subjected to magnetic field orientation, but the magnetic field orientation treatment may not be performed. Next, the magnetic material was cut into a sheet. Subsequently, magnetic recording was performed on the magnetic sheet using a magnetic recording device. That is, using a magnetic head having a head gap of 50 μm, recording was performed at a recording current capable of sufficiently recording the first magnetic layer in saturation. Recording was performed by the 100 bpi FM method.
【００１４】このようにして得た記録済み磁気シート
に、スクリーン印刷方式を用いて以下の手順にて第２の
磁性層を形成した。第２の磁性層用のインキを以下の配
合で調製した。 カルボニル鉄粉 １００重量部 （保磁力１０エルステッド 比表面積１ｍ2 ／ｇ） カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 キシレン ６０重量部 メチルエチルケトン ６０重量部 メチルイソブチルケトン ６０重量部 からなる混合物をボールミルで８時間分散した後、ポリ
イソシアネート樹脂５重量部を添加し、更に１時間分散
を行い、第２の磁性層用のスクリーン印刷インキを得
た。このようにして得たスクリーン印刷インキをスクリ
ーン印刷方式を用い、第１の磁性層を形成し磁気記録を
行った磁気原反のシートの第１の磁性層に積層して印
刷、乾燥させ、第２の磁性層を６μｍになるように形成
した。A second magnetic layer was formed on the recorded magnetic sheet obtained in this manner by the following procedure using a screen printing method. An ink for the second magnetic layer was prepared with the following composition. Carbonyl iron powder 100 parts by weight (coercive force 10 Oersted specific surface area 1 m 2 / g) Carbon black 3 parts by weight Lecithin 1 part by weight Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts by weight Polyurethane resin 20 parts by weight Xylene 60 parts by weight After dispersing a mixture consisting of 60 parts by weight of methyl ethyl ketone and 60 parts by weight of methyl isobutyl ketone in a ball mill for 8 hours, 5 parts by weight of a polyisocyanate resin was added, and the mixture was further dispersed for 1 hour to prepare a screen printing ink for a second magnetic layer. Obtained. The screen printing ink thus obtained is laminated on the first magnetic layer of the magnetic source sheet on which a first magnetic layer has been formed and magnetic recording has been performed by using a screen printing method, followed by printing and drying. The second magnetic layer was formed to have a thickness of 6 μm.
【００１５】このようにして得た磁気原反から、ＪＩＳ
サイズの磁気カードを打ち抜き以下の評価を行った。即
ち、塗工時に第１の磁性層に記録を行なった後第２の磁
性層を形成したトラックＴの部分に、３０００エルステ
ッドの磁性層を飽和記録できる記録条件で直流消去を行
った後、再生用磁気ヘッドで５００ガウスのバイアス磁
界をかけながら磁気情報の読出を行なったところ、第２
の磁性層に転写した第１の磁性層の記録情報は固定化し
ておりこの情報は消去されないため、読み出すことがで
きた。又、この磁気カードのトラックＴ以外の部分に３
０００エルステッドまでの保磁力を持つ磁性層に記録、
消去できる磁気ヘッドで１００ｂｐｉの記録密度でＦＭ
方式で記録を行なったところ、通常に記録，再生でき
た。すなわち通常の磁気カードとして使用できた。From the magnetic raw material thus obtained, JIS
The following evaluation was performed by punching out a magnetic card of a size. That is, after performing recording on the first magnetic layer at the time of coating, DC erasing is performed on the portion of the track T where the second magnetic layer is formed under a recording condition capable of saturation recording of the 3000 Oersted magnetic layer. Magnetic information was read while applying a bias magnetic field of 500 gauss with a magnetic head for use.
The recorded information of the first magnetic layer transferred to the magnetic layer was fixed, and this information was not erased, so that it could be read. Also, 3
Recorded on magnetic layer with coercivity up to 000 Oersted,
FM with erasable magnetic head at recording density of 100 bpi
When recording was performed by the system, recording and reproduction could be performed normally. That is, it could be used as a normal magnetic card.
【００１６】実施例４ 第２の磁性層の塗料として以下の配合を調製したほかは
実施例３と同様にして、本発明の磁気記録媒体を作成し
た。 マンガンジンクフェライト １００重量部 （保磁力２０エルステッド 比表面積１０ｍ2 ／ｇ） カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 トルエン ６０重量部 メチルエチルケトン ６０重量部 メチルイソブチルケトン ６０重量部 このようにして得た磁気原反から、ＪＩＳサイズの磁気
カードを打ち抜き実施例１と同様な評価を行ったとこ
ろ、実施例１と同様な結果を得た。又、この磁気カード
のトラックＴ以外の部分に３０００エルステッドまでの
保磁力を持つ磁性層に記録、消去できる磁気ヘッドで１
００ｂｐｉの記録密度でＦＭ方式で記録を行なったとこ
ろ、通常に記録，再生できた。すなわち通常の磁気カー
ドとして使用できた。Example 4 A magnetic recording medium of the present invention was prepared in the same manner as in Example 3, except that the following composition was prepared as a coating material for the second magnetic layer. Manganese zinc ferrite 100 parts by weight (coercive force 20 Oersted specific surface area 10 m 2 / g) Carbon black 3 parts by weight Lecithin 1 part by weight Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts by weight Polyurethane resin 20 parts by weight Toluene 60 parts by weight Methyl ethyl ketone 60 parts by weight Methyl isobutyl ketone 60 parts by weight From the magnetic raw material thus obtained, a JIS size magnetic card was punched out and evaluated in the same manner as in Example 1. As a result, the same results as in Example 1 were obtained. . A magnetic head capable of recording and erasing data on and from a magnetic layer having a coercive force of up to 3000 Oersted on a portion other than the track T of the magnetic card.
When recording was performed by the FM method at a recording density of 00 bpi, normal recording and reproduction could be performed. That is, it could be used as a normal magnetic card.
【００１７】実施例５ 第２の磁性層用の塗料として以下の配合を調製したほか
は実施例１と同様にして、本発明の磁気記録媒体を作成
した。 パーマロイ粉 １００重量部 （保磁力０．００６エルステッド 比表面積１ｍ2 ／ｇ） カーボンブラック ３重量部 レシチン １重量部 塩化ビニル・酢酸ビニル・ビニルアルコール共重合体 ２０重量部 ポリウレタン樹脂 ２０重量部 トルエン ６０重量部 メチルエチルケトン ６０重量部 メチルイソブチルケトン ６０重量部 からなる混合物をボールミルで８時間分散した後、ポリ
イソシアネート樹脂５重量部を添加し、更に１時間分散
を行い、第２の磁性層用塗料を得た。塗布は第１の磁性
層を形成した磁気原反に、第１の磁性層に積層する形で
第２の磁性層用の塗料を塗布する。塗布は第１の磁性層
を形成するのと同様に行えばよい。但し図３に示したよ
うに、第２の磁性層用塗料を塗布する前に、第１の磁性
層に磁気ヘッドを用いて予め磁気記録を行う。磁気記録
はヘッドギャップ５０μｍの磁気ヘッド２０を用い、第
１の磁性層を充分に飽和記録できる記録電流で記録を行
った。記録は１００ｂｐｉのＦＭ方式で行った。次いで
図３に示したように、塗工ヘッド部で第２の磁性層用塗
料を塗布し、乾燥パート中で乾燥させ、６μｍ厚さの第
２の磁性層を形成し、本発明の磁気記録媒体として巻取
る。このようにして得た本発明による磁気記録媒体か
ら、ＪＩＳサイズの磁気カードを打ち抜き以下の評価を
行った。Example 5 A magnetic recording medium of the present invention was prepared in the same manner as in Example 1 except that the following composition was prepared as a coating material for the second magnetic layer. Permalloy powder 100 parts by weight (coercive force 0.006 Oersted specific surface area 1 m 2 / g) Carbon black 3 parts by weight Lecithin 1 part by weight Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts by weight Polyurethane resin 20 parts by weight Toluene 60 parts by weight A mixture composed of 60 parts by weight of methyl ethyl ketone and 60 parts by weight of methyl isobutyl ketone was dispersed by a ball mill for 8 hours, and then 5 parts by weight of a polyisocyanate resin was added, and the mixture was further dispersed for 1 hour to obtain a second magnetic layer paint. . The coating is performed by applying a coating material for the second magnetic layer on the magnetic raw material on which the first magnetic layer is formed, in a form of being laminated on the first magnetic layer. The application may be performed in the same manner as when forming the first magnetic layer. However, as shown in FIG. 3, before applying the coating material for the second magnetic layer, magnetic recording is performed in advance on the first magnetic layer using a magnetic head. The magnetic recording was performed using a magnetic head 20 having a head gap of 50 μm and a recording current capable of sufficiently recording the first magnetic layer in saturation. Recording was performed by the 100 bpi FM method. Next, as shown in FIG. 3, a second magnetic layer paint is applied by a coating head portion and dried in a drying part to form a second magnetic layer having a thickness of 6 μm. Take up as a medium. From the magnetic recording medium according to the present invention thus obtained, a JIS size magnetic card was punched out and evaluated as follows.
【００１８】即ち、塗工時に第１の磁性層に記録を行っ
た後図１（ロ）に示すように第２の磁性層を形成した部
分に、図１（イ）のトラックＴ上を３０００エルステッ
ドの磁性層を飽和記録できる記録条件で直流消去を行っ
た後、再生用磁気ヘッドで５００ガウスのバイアス磁界
をかけながら情報の読み出しを行ったところ、第１の磁
性層に記録された情報は消去されたが、第２の磁性層に
は第１の磁性層の記録情報が転写、固定化しており、こ
の情報は消去されないため、読み出すことができた。
又、この磁気カードのトラックＴ以外の部分に３０００
エルステッドまでの保磁力を持つ磁性層に記録、消去で
きる磁気ヘッドで１００ｂｐｉの記録密度でＦＭ方式で
記録を行なったところ、通常に記録，再生できた。すな
わち通常の磁気カードとして使用できた。That is, after recording is performed on the first magnetic layer at the time of coating, as shown in FIG. 1B, the portion where the second magnetic layer is formed is moved to 3000 tracks on the track T in FIG. After DC erasing was performed under recording conditions that allowed saturation recording of the Oersted magnetic layer, information was read out while applying a bias magnetic field of 500 Gauss with a reproducing magnetic head, and the information recorded on the first magnetic layer was Although the information was erased, the recorded information of the first magnetic layer was transferred and fixed to the second magnetic layer, and this information was not erased, so that the information could be read.
Also, 3000 parts are added to the magnetic card other than the track T.
Recording was performed by the FM method at a recording density of 100 bpi with a magnetic head capable of recording and erasing on a magnetic layer having a coercive force up to Oersted. That is, it could be used as a normal magnetic card.
【００１９】[0019]
【発明の効果】本発明による磁気記録媒体は、後で追加
したり消去したりできない判定情報を磁性塗料塗布時に
いれることができる。この方法により製造されたカード
は 個々のカードに固有の判定情報を付与することがで
きるため、きわめて偽造、不正使用が困難である。また
製造設備も通常の磁気記録媒体の製造設備に簡単な磁気
記録装置を追加するだけであり、特殊な技術も必要ない
ため、生産性も高い。According to the magnetic recording medium of the present invention, judgment information which cannot be added or erased later can be included in the application of the magnetic paint. Cards manufactured by this method can be given unique judgment information to each card, which makes it extremely difficult to forge and illegally use the card. In addition, the manufacturing equipment simply adds a simple magnetic recording device to the normal magnetic recording medium manufacturing equipment, and does not require any special technology, so that the productivity is high.
【図１】（イ）は本発明の磁気記録媒体の平面図 （ロ）は図１（イ）のＸ−Ｘ線断面図で磁化した後の磁
気の状態図 （ハ）は図１（ロ）の第１の磁性層と第２の磁性層との
状態を拡大した断面図FIG. 1A is a plan view of the magnetic recording medium of the present invention. FIG. 1B is a magnetic phase diagram after magnetization in the XX line sectional view of FIG. Sectional view enlarging the state of the first magnetic layer and the second magnetic layer in FIG.
【図２】第１の磁性層の塗布工程図FIG. 2 is a drawing showing a coating process of a first magnetic layer.
【図３】第２の磁性層の塗布工程図FIG. 3 is a coating process diagram of a second magnetic layer.
Ｔ トラック １ 非磁性層からなる基体 ２ 第１の磁性層 ３ 第２の磁性層 １１ 送り出しリール １２ 第１の磁性層用の塗料の塗布装置 １３ 塗工ヘッド部 １４ ロール １５ 磁場配向装置 １６ 乾燥パート １７ ロール １８ 巻取りリール １９ 送り出しリール ２０ 磁気ヘッド ２１ 第２の磁性層用の塗料の塗布装置 ２２ 塗工ヘッド部 ２３ ロール ２４ 乾燥パート ２５ ロール ２６ 巻取りリール T track 1 Base composed of non-magnetic layer 2 First magnetic layer 3 Second magnetic layer 11 Sending reel 12 Paint coating device for first magnetic layer 13 Coating head unit 14 Roll 15 Magnetic field orientation device 16 Drying part Reference Signs List 17 roll 18 take-up reel 19 send-out reel 20 magnetic head 21 coating device for coating material for second magnetic layer 22 coating head unit 23 roll 24 drying part 25 roll 26 take-up reel
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ１１Ｂ 5/842 Ｇ０６Ｋ 19/00 Ｂ (56)参考文献 特開 昭63−34727（ＪＰ，Ａ) 特開 平３−113822（ＪＰ，Ａ) 特開 平２−10516（ＪＰ，Ａ) 特開 平３−49031（ＪＰ，Ａ) 特開 平４−49518（ＪＰ，Ａ) 特開 平３−244598（ＪＰ，Ａ) 特開 昭58−80783（ＪＰ，Ａ) 実開 昭62−153613（ＪＰ，Ｕ)Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI Technical display location G11B 5/842 G06K 19/00 B (56) References JP-A-63-34727 (JP, A) JP-A Heisei JP-A-3-113822 (JP, A) JP-A-2-10516 (JP, A) JP-A-3-49031 (JP, A) JP-A-4-49518 (JP, A) JP-A-3-244598 (JP, A A) JP-A-58-80783 (JP, A) JP-A-62-153613 (JP, U)
Claims (2)
ステッド〜４０００エルステッドの保磁力の磁性体から
なる第１の磁性層と、１００エルステッド以下の低保磁
力の磁性体からなり、後で追加も消去も不可能な情報が
記録されてなる第２の磁性層を順次積層したことを特徴
とする磁気記録媒体。1. A first magnetic layer made of a magnetic material having a coercive force of 250 to 4000 Oe on a base made of a non-magnetic material, and a magnetic material made of a low coercive force of 100 Oe or less, and added later. A magnetic recording medium characterized by sequentially laminating a second magnetic layer on which information that cannot be erased is recorded.
ステッド〜４０００エルステッドの保磁力の磁性体から
なる磁気塗料を塗布、乾燥することにより第１の磁性層
を形成し、ついで該磁性層に磁気記録を行ない、しかる
後、１００エルステッド以下の低保磁力の磁性体からな
る磁気塗料を塗布、乾燥することにより第２の磁性層を
形成することを特徴とする磁気記録媒体の製造方法。2. A first magnetic layer is formed by applying and drying a magnetic paint made of a magnetic material having a coercive force of 250 Oersted to 4000 Oersted on a base made of a nonmagnetic material, and then forming a first magnetic layer. A method for producing a magnetic recording medium, comprising: performing magnetic recording; thereafter, applying a magnetic paint made of a magnetic material having a low coercive force of 100 Oe or less and drying to form a second magnetic layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4150086A JPH0729156A (en) | 1992-05-19 | 1992-05-19 | Magnetic recording medium and its manufacture |
| JP4-150086 | 1992-05-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0729157A JPH0729157A (en) | 1995-01-31 |
| JP2649756B2 true JP2649756B2 (en) | 1997-09-03 |
Family
ID=15489211
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4150086A Pending JPH0729156A (en) | 1992-05-19 | 1992-05-19 | Magnetic recording medium and its manufacture |
| JP4175930A Expired - Fee Related JP2649756B2 (en) | 1992-05-19 | 1992-06-11 | Magnetic recording medium and method of manufacturing the same |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4150086A Pending JPH0729156A (en) | 1992-05-19 | 1992-05-19 | Magnetic recording medium and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (2) | JPH0729156A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3542276B2 (en) * | 1998-06-24 | 2004-07-14 | 株式会社巴川製紙所 | Method for reproducing fixed information from magnetic recording medium |
-
1992
- 1992-05-19 JP JP4150086A patent/JPH0729156A/en active Pending
- 1992-06-11 JP JP4175930A patent/JP2649756B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0729156A (en) | 1995-01-31 |
| JPH0729157A (en) | 1995-01-31 |
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