JPH0337987Y2 - - Google Patents
Info
- Publication number
- JPH0337987Y2 JPH0337987Y2 JP9629285U JP9629285U JPH0337987Y2 JP H0337987 Y2 JPH0337987 Y2 JP H0337987Y2 JP 9629285 U JP9629285 U JP 9629285U JP 9629285 U JP9629285 U JP 9629285U JP H0337987 Y2 JPH0337987 Y2 JP H0337987Y2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- magnetic
- card
- magnetic recording
- information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000010410 layer Substances 0.000 claims description 35
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000011241 protective layer Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 7
- 238000007639 printing Methods 0.000 description 7
- 239000010408 film Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 229920005749 polyurethane resin Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 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 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- GWOWVOYJLHSRJJ-UHFFFAOYSA-L cadmium stearate Chemical compound [Cd+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O GWOWVOYJLHSRJJ-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000000787 lecithin Substances 0.000 description 1
- 235000010445 lecithin Nutrition 0.000 description 1
- 229940067606 lecithin Drugs 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 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)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、情報記録カードに関し、特に文字、
符号、図形等の画像情報とデジタル磁気記録情報
を重ねて記録可能なカードに関するものである。[Detailed description of the invention] [Industrial field of application] The present invention relates to information recording cards, especially characters,
The present invention relates to a card that can record image information such as codes and figures and digital magnetic recording information in a superimposed manner.
プラスチツクなどの支持体の表面に磁気記録層
を設けた磁気カードは、キヤツシユカード、ID
カード、定期券、回数券などの用途に広く使われ
ている。
Magnetic cards, which have a magnetic recording layer on the surface of a support such as plastic, can be used as cash cards, ID cards, etc.
It is widely used for cards, commuter passes, coupon tickets, etc.
このような磁気カードは、磁気記録層以外の支
持体表面の余白部分又は裏面に、文字、符号、図
形などの印刷が行なわれている。ところが、磁気
記録層の部分を広げると、文字、符号、図形など
を印刷する面積が減少する。又その逆の場合は磁
気記録可能な部分が減少するという問題がある。 In such a magnetic card, characters, codes, figures, etc. are printed on the blank space on the surface of the support other than the magnetic recording layer, or on the back surface. However, when the magnetic recording layer is expanded, the area on which characters, codes, figures, etc. can be printed is reduced. In the opposite case, there is a problem that the magnetically recordable area decreases.
このため磁気記録層の上に直接又は白色層を設
けその上に、文字、符号、図形などを通常の印刷
方式(例えば、グラビア、オフセツト、凸版な
ど)で印刷した磁気カードが、一部で使用され始
めている。しかし上記のような方法で印刷した場
合には、画一的な印刷内容の場合には適している
が、多種少量又は1枚毎異なる情報を印刷するに
は適していない。 For this reason, some magnetic cards are used, in which characters, codes, figures, etc. are printed directly on the magnetic recording layer or on a white layer using normal printing methods (e.g., gravure, offset, letterpress, etc.). It's starting to happen. However, when printing by the above method, although it is suitable for printing uniform contents, it is not suitable for printing a wide variety of small amounts or different information on each sheet.
本考案は、このような種々の問題を取り除くた
めになされたものであり、支持体の一つの面に文
字、符号、図形などの画像情報とデータ処理に必
要なデジタル情報を重ねて記録し、しかも個別の
情報を容易にかつ低コストで実現するための情報
記録カードを提供することを目的とする。
The present invention was made to eliminate these various problems, and it records image information such as characters, codes, figures, etc. and digital information necessary for data processing in an overlapping manner on one surface of a support. Moreover, it is an object of the present invention to provide an information recording card for realizing individual information easily and at low cost.
本考案は、前記のような目的を達成するため、
プラスチツク又は紙などの支持体に磁気記録層を
設け、さらにその上に加熱することにより透明化
する隠蔽層を設けたもので、支持体の一つの面に
文字、符号、図形などの画像情報と、データ処理
に必要なデジタル情報を重ねて記録可能な情報記
録カードを提供する。
In order to achieve the above objectives, the present invention
A magnetic recording layer is provided on a support such as plastic or paper, and a concealing layer is provided on top of the magnetic recording layer, which becomes transparent when heated. To provide an information recording card that can record digital information necessary for data processing in an overlapping manner.
以下、図面に基づいて本考案の構成について詳
細に説明する。第1図は、本考案の一実施例の磁
気カードの断面図である。このカードは支持体4
の上に磁気記録層3を設け、さらにその上に加熱
により透明化する隠蔽層2を設けた構造である。 Hereinafter, the configuration of the present invention will be explained in detail based on the drawings. FIG. 1 is a sectional view of a magnetic card according to an embodiment of the present invention. This card is support 4
It has a structure in which a magnetic recording layer 3 is provided on top of the magnetic recording layer 3, and a hiding layer 2 that becomes transparent by heating is further provided on top of the magnetic recording layer 3.
第2図は隠蔽層2の上に保護層5を設けた例で
あり、第3図は磁気記録層3を支持体4の一部に
設けた例である。 FIG. 2 shows an example in which a protective layer 5 is provided on the hiding layer 2, and FIG. 3 shows an example in which the magnetic recording layer 3 is provided on a part of the support 4.
支持体4は、ポリエチレンテレフタレートフイ
ルム、ポリ塩化ビニルフイルムなどのプラスチツ
クフイルムなどが使用される。又上質紙、合成樹
脂含浸紙などの厚さの均一な紙でも良い。磁気記
録層3はFe3O4,γ−Fe2O3,Co被着γ−Fe2O3,
Baフエライトなど酸化物磁性粉、Fe,Fe−Co合
金などの金属磁性粉とカーボンなどの有機顔料と
を合成樹脂バインダーに均一に分散させた黒色又
は有色塗膜で形成される。磁気記録層3として
は、この外高保磁力金属薄膜(例えばCo,Co−
Ni蒸着又はスパツタ膜など)を用いても良い。 As the support 4, a plastic film such as polyethylene terephthalate film or polyvinyl chloride film is used. Alternatively, paper of uniform thickness such as high-quality paper or synthetic resin-impregnated paper may be used. The magnetic recording layer 3 is made of Fe 3 O 4 , γ-Fe 2 O 3 , Co-coated γ-Fe 2 O 3 ,
It is formed of a black or colored coating film made by uniformly dispersing oxide magnetic powder such as Ba ferrite, metal magnetic powder such as Fe, Fe-Co alloy, and organic pigment such as carbon in a synthetic resin binder. As the magnetic recording layer 3, this outer high coercive force metal thin film (for example, Co, Co-
(Ni vapor deposition, sputtering film, etc.) may also be used.
加熱により透明化する隠蔽層2として、シリカ
を塩ビ−酢ビ共重合樹脂及びポリウレタン樹脂の
混合物に均一に分散させたもの、不透明ワツクス
(mp 60℃〜150℃)及びステアリン酸カドミウム
をエチルセルロースに分散させたもの、又は熱可
溶性ワツクスと炭酸カルシウム層を重層したもの
など白色又は白色に近い淡色の塗膜が使用され
る。 The concealing layer 2, which becomes transparent when heated, is made by uniformly dispersing silica in a mixture of a vinyl chloride-vinyl acetate copolymer resin and a polyurethane resin, an opaque wax (mp 60°C to 150°C), and cadmium stearate dispersed in ethyl cellulose. A white or near-white coating film is used, such as a coating made of a heat-soluble wax and a layer of calcium carbonate.
次に上記構成の情報記録カードに文字、符号、
図形などの画像情報を記録する方法について第4
図により説明する。第4図の7は加熱素子であ
り、例えば発熱素子を1列に多数設けた薄膜感熱
ヘツドが用いられる。画像情報のパターンに従つ
て発熱素子7が加熱される。隠蔽層2の加熱され
た部分6は透明化し、磁性層3の色調が表われ
る。情報記録カードは矢印の方向に移動すること
により、順次記録部分が透明化し画像が形成され
る。加熱方法としては、このほかに加熱印版によ
るホツトスタンプ法、レーザーによる加熱法も利
用される。
Next, write letters, codes,
Part 4: How to record image information such as figures
This will be explained using figures. Reference numeral 7 in FIG. 4 is a heating element, and for example, a thin film thermal head in which a large number of heating elements are arranged in one row is used. The heating element 7 is heated according to the pattern of the image information. The heated portion 6 of the hiding layer 2 becomes transparent, and the color tone of the magnetic layer 3 appears. By moving the information recording card in the direction of the arrow, the recorded portions become transparent one after another and an image is formed. Other heating methods that can be used include a hot stamping method using a heated printing plate and a heating method using a laser.
データ処理に必要なデジタル信号の記録は、通
常用いられる磁気カード書き込み読み取り機がそ
のまま利用できる。 For recording the digital signals necessary for data processing, a commonly used magnetic card writer/reader can be used as is.
レシチン 2重量部
塩ビ−酢ビ−ビニルアルコール 20重量部
共重合体(UCC社:VAGH)
ポリウレタン樹脂 10重量部
(ピ・エフ・グツドリツチ社
エステン5701)
メチルエチルケトン 250重量部
(MEK)
テトラヒドロフラン 100重量部
(THF)
これらの樹脂、添加剤、溶剤をミキサーで充分
攪拌し溶解した。その後Fe3O4(長軸0.6μm 短
軸0.1μm)120重量部と共にボールミル中に投入
し、24時間分散させた。分散後この磁性塗料中
に、バインダーの水酸基と反応し得るイソシアネ
ート化合物(デスモジユールL)を5重量部加え
ミキサーで充分混合した。このようにして得られ
た磁性塗料を180μm厚の白色ポリエチレンテレ
フタレートフイルム上に約10μmの厚さに塗布
し、80℃の温度で24時間保持して加橋反応を促進
させた。
Lecithin 2 parts by weight PVC-vinyl acetate-vinyl alcohol 20 parts by weight Copolymer (UCC: VAGH) Polyurethane resin 10 parts by weight (P.F. THF) These resins, additives, and solvents were thoroughly stirred and dissolved using a mixer. Thereafter, it was put into a ball mill together with 120 parts by weight of Fe 3 O 4 (long axis: 0.6 μm, short axis: 0.1 μm), and dispersed for 24 hours. After dispersion, 5 parts by weight of an isocyanate compound (Desmodyur L) capable of reacting with the hydroxyl groups of the binder was added to the magnetic paint and thoroughly mixed with a mixer. The magnetic paint thus obtained was applied to a thickness of about 10 μm on a 180 μm thick white polyethylene terephthalate film, and maintained at a temperature of 80° C. for 24 hours to promote the crosslinking reaction.
この様にして磁気原反を作成した。 A magnetic original fabric was created in this manner.
次に隠蔽層材料として、
塩ビ−酢ビ共重合体 115重量部
(エスレツクA)
ポリウレタン樹脂 145重量部
(ニツポラン3113)
溶剤 トルエン 220重量部
メチルエチルケトン 220重量部
(MEK)
メチルイソブチルケトン 220重量部
(MIBK)
をミキサーで充分操作しラツカーを作成し、これ
に
シリカ(ミズカシルP−526) 60重量部
カツプリング剤 14重量部
(トーレシリコンSH6079)
を加えミキサーで均一に分散して隠蔽層塗料を作
成した。この塗料を上記の磁気原反の上に、乾燥
時の厚さで約8μmに成るように均一に塗布乾燥
して、隠蔽層を形成した。これを所望の大きさに
打ち抜き情報記録カードを得た。 Next, as concealing layer materials: PVC-vinyl acetate copolymer 115 parts by weight (Eslec A) Polyurethane resin 145 parts by weight (Nitsuporan 3113) Solvent Toluene 220 parts by weight Methyl ethyl ketone 220 parts by weight (MEK) Methyl isobutyl ketone 220 parts by weight (MIBK) ) was sufficiently manipulated in a mixer to create a lacquer, to which 60 parts by weight of silica (Mizukasil P-526) and 14 parts by weight of a coupling agent (Toray Silicone SH6079) were added and uniformly dispersed in a mixer to create a concealing layer paint. This paint was applied uniformly onto the above-mentioned magnetic original fabric to a dry thickness of about 8 μm and dried to form a concealing layer. This was punched out to a desired size to obtain an information recording card.
次にこの情報記録カードに、文字パターン状の
加熱印版を用いて100℃の温度1秒間加熱したと
ころ、鮮明な黒色の文字パターンが得られた。さ
らにこのカードに、ヘツドギヤツプ長50μmの磁
気カード用ヘツドを用いて、150FCIの信号を飽
和記録して、これを再生した結果、出力変動も少
なく安定な再生出力波形が観察された。 Next, when this information recording card was heated for 1 second at 100° C. using a heating printing plate shaped like a character pattern, a clear black character pattern was obtained. Furthermore, when a 150FCI signal was recorded in saturation on this card using a magnetic card head with a head gap length of 50 μm and this was reproduced, a stable reproduced output waveform with little output fluctuation was observed.
本考案は、支持体の上に磁気記録層を設け、さ
らにその上に加熱することにより透明化する隠蔽
層を設けた構成の情報記録用カードであるため、
以下のような効果を生ずる。すなわち
(1) デジタル磁気情報と画像情報を支持体の一つ
の面に記録することが可能なため、多くの情報
が記録できる。
The present invention is an information recording card that has a magnetic recording layer on a support and a concealing layer that becomes transparent when heated.
The following effects are produced. Namely, (1) Digital magnetic information and image information can be recorded on one surface of the support, so a large amount of information can be recorded.
(2) 各カード毎に異なる個別情報の記録が容易に
できる。(2) Different individual information can be easily recorded for each card.
(3) カードの偽造・改ざんが困難である。(3) It is difficult to forge or tamper with the card.
(4) 磁気記録層がそのまま有色の着色層として利
用できるので、画像記録にインキ、トナーなど
を必要とせず、画像記録が簡単、低コストでか
つ印刷インキなどによる表面凹凸による磁気記
録情報の出力変動が少なく信頼性がある。(4) Since the magnetic recording layer can be used as it is as a colored layer, there is no need for ink, toner, etc. for image recording, and image recording is simple and low cost, and magnetic recording information can be output using surface irregularities caused by printing ink, etc. It is reliable with little fluctuation.
第1図は本考案の一実施例を示すカードの断面
図、第2図、第3図は別の実施例を示すカードの
断面図、第4図は画像情報記録の説明のためのカ
ード断面図である。
1……情報記録カード、2……隠蔽層、3……
磁気記録層、4……支持体、5……保護層。
Fig. 1 is a sectional view of a card showing one embodiment of the present invention, Figs. 2 and 3 are sectional views of a card showing another embodiment, and Fig. 4 is a sectional view of a card for explaining image information recording. It is a diagram. 1...Information recording card, 2...Hidden layer, 3...
Magnetic recording layer, 4... support, 5... protective layer.
Claims (1)
なくとも前記磁性層の上に、加熱により透明化
する隠蔽層を設けたことを特徴とする情報記録
カード。 (2) 前記隠蔽層の上に保護層を設けた実用新案登
録請求の範囲第(1)項記載の情報記録カード。 (3) 前記磁気記録層が暗色又は着色された磁性塗
膜である実用新案登録請求の範囲第(1)項又は第
(2)項記載の情報記録カード。 (4) 前記隠蔽層は、白色又は淡色の塗膜である実
用新案登録請求の範囲第(1)項又は第(2)項記載の
情報記録カード。[Claims for Utility Model Registration] (1) An information recording card characterized in that a magnetic recording layer is provided on a part or the entire surface of a support, and a concealing layer that becomes transparent when heated is provided at least on the magnetic layer. . (2) The information recording card according to claim (1) of the utility model registration claim, wherein a protective layer is provided on the concealing layer. (3) Utility model registration claims paragraph (1) or paragraph 2, wherein the magnetic recording layer is a dark-colored or colored magnetic coating film.
Information recording card described in (2). (4) The information recording card according to claim 1 or 2, wherein the concealing layer is a white or light-colored coating film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9629285U JPH0337987Y2 (en) | 1985-06-25 | 1985-06-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9629285U JPH0337987Y2 (en) | 1985-06-25 | 1985-06-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS623769U JPS623769U (en) | 1987-01-10 |
| JPH0337987Y2 true JPH0337987Y2 (en) | 1991-08-12 |
Family
ID=30655708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9629285U Expired JPH0337987Y2 (en) | 1985-06-25 | 1985-06-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0337987Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009040430A (en) * | 2007-08-06 | 2009-02-26 | Howa Sangyo Kk | Food packaging bag and manufacturing method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0728570Y2 (en) * | 1987-08-04 | 1995-06-28 | 凸版印刷株式会社 | Magnetic card |
| WO1992002372A1 (en) * | 1990-08-10 | 1992-02-20 | Kabushiki Kaisha Csk | Magnetic card |
| JPH0445085U (en) * | 1990-08-10 | 1992-04-16 |
-
1985
- 1985-06-25 JP JP9629285U patent/JPH0337987Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009040430A (en) * | 2007-08-06 | 2009-02-26 | Howa Sangyo Kk | Food packaging bag and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS623769U (en) | 1987-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5113062A (en) | Magnetic card having thermal recording layer and arrangement of magnetic bars for recording security information | |
| JP2545444B2 (en) | Magnetic recording medium and manufacturing method thereof | |
| JPH0337987Y2 (en) | ||
| JPH0576686B2 (en) | ||
| JPH0799577B2 (en) | Magnetic recording medium | |
| JP2759747B2 (en) | Magnetic recording medium and manufacturing method thereof | |
| JPH0519845Y2 (en) | ||
| JP2567787B2 (en) | Method of manufacturing magnetic recording medium | |
| JPH06262886A (en) | Magnetic thermosensitive recording medium | |
| JPH01215588A (en) | Information recording medium and information recording method using said medium | |
| JPH0512067Y2 (en) | ||
| JP3125934B2 (en) | Magnetic recording media | |
| JPS5847530Y2 (en) | magnetic recording medium | |
| JPH0512068Y2 (en) | ||
| JP2706714B2 (en) | Magnetic recording medium and manufacturing method thereof | |
| JP3327501B2 (en) | Thermal magnetic recording media | |
| JPH0696444A (en) | Production of magnetic recording medium | |
| JPH0635225B2 (en) | Information recording medium | |
| JPH0528996B2 (en) | ||
| JP2593362Y2 (en) | Thermal transfer recording medium | |
| JP3769186B2 (en) | Thermal magnetic recording medium | |
| JP2598731Y2 (en) | Reversible thermosensitive recording medium | |
| JPH0380427A (en) | thermosensitive magnetic recording medium | |
| JP3019120B2 (en) | Thermal recording medium and method of manufacturing the same | |
| JPH0558043A (en) | Thermal recording medium |