JPH05139079A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH05139079A JPH05139079A JP3144135A JP14413591A JPH05139079A JP H05139079 A JPH05139079 A JP H05139079A JP 3144135 A JP3144135 A JP 3144135A JP 14413591 A JP14413591 A JP 14413591A JP H05139079 A JPH05139079 A JP H05139079A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- rewritable
- recording layer
- information
- resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000002441 reversible effect Effects 0.000 claims abstract description 28
- 230000002427 irreversible effect Effects 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 230000001235 sensitizing effect Effects 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims abstract description 5
- 229920000642 polymer Polymers 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 75
- 239000011241 protective layer Substances 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 abstract description 10
- 238000002156 mixing Methods 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 229920005989 resin Polymers 0.000 description 14
- 239000011347 resin Substances 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 5
- -1 polyethylene terephthalate Polymers 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 4
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 4
- 229920001225 polyester resin Polymers 0.000 description 4
- 239000004645 polyester resin Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000001993 wax Substances 0.000 description 4
- 229920000178 Acrylic resin Polymers 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 2
- 235000021357 Behenic acid Nutrition 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 239000005456 alcohol based solvent Substances 0.000 description 2
- 229940116226 behenic acid Drugs 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 2
- KFEVDPWXEVUUMW-UHFFFAOYSA-N docosanoic acid Natural products CCCCCCCCCCCCCCCCCCCCCC(=O)OCCC1=CC=C(O)C=C1 KFEVDPWXEVUUMW-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N methyl undecanoic acid Natural products CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- 239000004200 microcrystalline wax Substances 0.000 description 2
- 235000019808 microcrystalline wax Nutrition 0.000 description 2
- 239000012170 montan wax Substances 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 150000004671 saturated fatty acids Chemical class 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 2
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- 229920001800 Shellac Polymers 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910001361 White metal Inorganic materials 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-N o-dicarboxybenzene Natural products OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 229940113162 oleylamide Drugs 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000003441 saturated fatty acids Nutrition 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 239000004208 shellac Substances 0.000 description 1
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 description 1
- 229940113147 shellac Drugs 0.000 description 1
- 235000013874 shellac Nutrition 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000010969 white metal Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
- B41M5/48—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography combined with other image registration layers or compositions; Special originals for reproduction by thermography
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
- G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/36—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties
- B41M5/363—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties using materials comprising a polymeric matrix containing a low molecular weight organic compound such as a fatty acid, e.g. for reversible recording
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
- G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Credit Cards Or The Like (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、磁気記録媒体、とく
に利用状況などの情報を感熱記録手段によって可視的に
書き込むことが可能なカード型の磁気記録媒体に関す
る。この発明の磁気記録媒体は、たとえば各種のプリペ
イド磁気カードの磁気記録内容に対応した数字等を印字
して、磁気記録内容を視認可能とする用途に有効に利用
できる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium, and more particularly to a card-type magnetic recording medium on which information such as the use status can be visually written by a thermal recording means. INDUSTRIAL APPLICABILITY The magnetic recording medium of the present invention can be effectively used for, for example, printing numbers or the like corresponding to the magnetic recording contents of various prepaid magnetic cards to make the magnetic recording contents visible.
【０００２】[0002]
【従来の技術】プリペイド磁気カードの普及に伴い、磁
気記録内容に対応した文字、数字等を印字して磁気記録
内容を視認可能にするという要求が増加している。たと
えばプリペイドカードが複数回にわたって利用される場
合、各回の利用内容や金額、およびカードの残額を利用
者が目視で確認できれば便利である。このような要求に
対処するため、感熱記録手段を使って記録できる感熱記
録層を設けた磁気カードが開発されている（たとえば特
開平２−６２２８７号公報参照）。この従来の磁気カー
ドは、プラスチックの基材の一方の表面上に、コントラ
スト付与層、感熱層、金属薄層、および保護層を順次設
けた構造を有し、感熱記録は、保護層表面に感熱記録装
置のサーマルヘッドを接触させることによって行なわれ
る。サーマルヘッドによって与えられた熱は、保護層お
よび第２の感熱層を介して金属薄層に伝達されてこれを
溶融し、この部分に孔をあける。金属薄層の下方にはコ
ントラスト付与層が位置しているので、孔の部分ではこ
のコントラスト付与層が透視されることになり、孔のな
い部分との間のコントラストにより、孔に対応した文
字、数字等が目視できる。2. Description of the Related Art With the widespread use of prepaid magnetic cards, there is an increasing demand for printing characters, numbers, etc. corresponding to the magnetic recording contents to make the magnetic recording contents visible. For example, when a prepaid card is used multiple times, it is convenient if the user can visually check the usage contents and amount of money each time, and the balance of the card. In order to meet such a demand, a magnetic card provided with a heat-sensitive recording layer capable of recording using a heat-sensitive recording means has been developed (see, for example, Japanese Patent Laid-Open No. 62287/1990). This conventional magnetic card has a structure in which a contrast-imparting layer, a heat-sensitive layer, a thin metal layer, and a protective layer are sequentially provided on one surface of a plastic substrate. This is performed by bringing the thermal head of the recording device into contact. The heat provided by the thermal head is transferred to the thin metal layer through the protective layer and the second heat sensitive layer to melt the thin metal layer, thereby forming a hole in this portion. Since the contrast-imparting layer is located below the thin metal layer, the contrast-imparting layer will be seen through in the hole portion, and the contrast between the hole-free portion and the character corresponding to the hole, You can see the numbers.
【０００３】[0003]
【発明が解決しようとする課題】前述のような従来の磁
気記録媒体は、利用状況などの情報を目視可能な形態で
記録できる点で便利なものであるが、一時的な情報、あ
るいは書換えが必要な情報を記録する場合には、一旦記
録した情報を塗りつぶし、別の領域に新たな情報を記録
するなどの手段を講じなければならない。しかしながら
記録のために使用できる領域は限られているので、書換
えの回数をあまり多くすることはできない。The conventional magnetic recording medium as described above is convenient because it can record information such as the usage status in a visually recognizable form, but temporary information or rewriting is not possible. When recording necessary information, it is necessary to take measures such as filling in the recorded information and recording new information in another area. However, since the area that can be used for recording is limited, the number of times of rewriting cannot be increased too much.
【０００４】[0004]
【課題を解決するための手段】この発明による磁気記録
媒体は、感熱記録手段によって情報を不可逆的に記録す
るための不可逆性感熱記録層と、同じく感熱記録手段に
よって情報を可逆的に、すなわち書換え可能に記録する
ための可逆性感熱記録層とを備えている。この磁気記録
媒体をたとえばプリペイド磁気カードに適用した場合、
利用明細などの情報は可逆性感熱記録層に記録し、使用
済みとなったときには「使用不可」を示す記号等を不可
逆性感熱層に記録することにより、使用済みのカードを
不正に使用するなどの事故を防止することができる。A magnetic recording medium according to the present invention includes an irreversible heat-sensitive recording layer for irreversibly recording information by a heat-sensitive recording means, and reversible information, that is, rewriting by the same heat-sensitive recording means. And a reversible thermosensitive recording layer for possible recording. When this magnetic recording medium is applied to a prepaid magnetic card, for example,
Information such as usage details is recorded in the reversible thermosensitive recording layer, and when used, a symbol indicating "unusable" is recorded in the irreversible thermosensitive layer, so that a used card is illegally used. Can prevent accidents.
【０００５】この発明の好ましい実施態様において、磁
気カードの形態の磁気記録媒体は、プラスチックの基材
の一方の表面上に、コントラスト付与層、増感層、金属
薄層、可逆性感熱記録層および保護層を順次設けた構造
を有する。可逆性感熱記録層での感熱記録は、保護層表
面に感熱記録装置のサーマルヘッドを接触させることに
よって行なわれる。サーマルヘッドによって与えられた
熱は、可逆性感熱記録層保護層の光透過性を変化させ、
熱の与えられなかった部分との光透過性の差によって、
所望の情報を可視的に記録する。In a preferred embodiment of the invention, a magnetic recording medium in the form of a magnetic card comprises a contrast-imparting layer, a sensitizing layer, a thin metal layer, a reversible thermosensitive recording layer and a reversible thermosensitive recording layer on one surface of a plastic substrate. It has a structure in which protective layers are sequentially provided. Thermal recording on the reversible thermosensitive recording layer is performed by bringing a thermal head of a thermal recording device into contact with the surface of the protective layer. The heat given by the thermal head changes the light transmittance of the reversible thermosensitive recording layer protective layer,
Due to the difference in light transmission from the part that was not given heat,
Visually record the desired information.
【０００６】このような可逆的記録を行なうための可逆
性感熱記録層は、ビニル系ポリマーあるいはポリエステ
ルなどの重合体からなるマトリックスに、飽和または不
飽和脂肪酸またはその誘導体などの有機低分子物質を混
合した混合物を適当な厚さで塗布することによって形成
することが可能である。この可逆性感熱記録層は、外部
から熱を加えられたときに、その温度に応じて、透明な
状態からほとんど不透明な白濁状態までの範囲でその光
透過性を変え、冷却後にはその状態を保持する性質をも
つ。The reversible thermosensitive recording layer for performing such reversible recording is prepared by mixing a matrix composed of a polymer such as a vinyl polymer or polyester with an organic low molecular weight substance such as saturated or unsaturated fatty acid or its derivative. It is possible to form it by applying the above mixture in an appropriate thickness. This reversible thermosensitive recording layer changes its light transmittance in a range from a transparent state to an almost opaque white turbid state according to the temperature when heat is applied from the outside, and changes its state after cooling. It has the property of retaining.
【０００７】代表的な可逆性感熱記録層の加熱温度と光
透過度との関係を図１に示す。可逆性感熱記録層がＴ1
〜Ｔ2の範囲の温度に加熱され、ついでＴ0まで冷却され
たとすると、この層はその最も高い透明度を有する。つ
ぎにこの層がＴ3以上の高い温度まで加熱されたのちＴ0
まで冷却されると、透明度の最も低い白濁した状態とな
る。またＴ0〜Ｔ1までの間、またはＴ2〜Ｔ3までの間の
温度に加熱した後Ｔ0まで冷却した場合には、加熱時の
温度に対応して変化する透明度をもつ。そしてこの透明
度の変化は完全に可逆的であり、加熱および冷却を繰り
返す毎に所望の透明度を得ることができる。FIG. 1 shows the relationship between the heating temperature and the light transmittance of a typical reversible thermosensitive recording layer. Reversible thermosensitive recording layer is T1
If heated to a temperature in the range .about.T2 and then cooled to T0, this layer has its highest transparency. The layer is then heated to a temperature above T3 and then T0.
When it is cooled to, it becomes a cloudy state with the lowest transparency. Further, when heated to a temperature between T0 and T1 or between T2 and T3 and then cooled to T0, it has a transparency that changes according to the temperature at the time of heating. This change in transparency is completely reversible, and the desired transparency can be obtained each time heating and cooling are repeated.
【０００８】このような可逆性感熱記録層を形成するた
めの混合物において、マトリックスとして適当な材料と
しては、ポリ塩化ビニル；あるいは塩化ビニルと塩化ビ
ニリデン、酢酸ビニル、ビニルアルコール、マレイン
酸、アクリル酸エステル、アクリロニトリルまたはポリ
エステルの１種または２種以上との共重合体が挙げられ
る。また適当な有機低分子物質は、炭素数約１０〜３０
の飽和または不飽和脂肪酸またはその塩類、エステル
類、アミドの中から選択される。最適な有機低分子物質
は、ステアリン酸、オレイン酸などの脂肪酸である。Polyvinyl chloride; or vinyl chloride and vinylidene chloride, vinyl acetate, vinyl alcohol, maleic acid, acrylic acid ester are suitable materials for the matrix in the mixture for forming such a reversible thermosensitive recording layer. , Acrylonitrile, or a copolymer with one or more kinds of polyesters. Further, a suitable organic low molecular weight substance has a carbon number of about 10 to 30.
Selected from among saturated or unsaturated fatty acids or salts thereof, esters and amides. The most suitable organic low molecular weight substances are fatty acids such as stearic acid and oleic acid.
【０００９】この混合物は、必要に応じて、染料あるい
は顔料を含有することができる。The mixture may contain a dye or a pigment, if desired.
【００１０】一方、不可逆的な情報を記録する場合に
は、保護層表面に感熱記録装置のサーマルヘッドを接触
させ、金属薄層に部分的に孔をあける。金属薄層の下方
にはコントラスト付与層が位置しているので、孔の部分
ではこのコントラスト付与層が透視されることになり、
孔のない部分との間のコントラストにより、孔に対応し
た文字、数字等が目視できる。この場合の加熱温度Ｔ4
は、可逆性感熱記録層の透明度を変化させるために適用
される最高温度Ｔ3よりもかなり高い。On the other hand, in the case of recording irreversible information, the thermal head of the thermal recording device is brought into contact with the surface of the protective layer, and the metal thin layer is partially perforated. Since the contrast-imparting layer is located below the thin metal layer, the contrast-imparting layer is seen through at the hole portion.
Characters, numbers, etc. corresponding to the holes can be visually observed due to the contrast between the parts without holes. Heating temperature T4 in this case
Is significantly higher than the maximum temperature T3 applied to change the transparency of the reversible thermosensitive recording layer.
【００１１】したがって、通常の使用状態では可逆性感
熱記録層の透明度の変化を利用して所望の記録を行い、
書換えの必要のない、または書換えを望まない情報を記
録する場合には不可逆性感熱記録層に書き込むことによ
り、多様な記録形態に対応することが可能である。Therefore, in normal use, desired recording is performed by utilizing the change in transparency of the reversible thermosensitive recording layer,
When recording information that does not need to be rewritten or is not desired to be rewritten, by writing in the irreversible thermosensitive recording layer, it is possible to cope with various recording forms.
【００１２】[0012]
【実施例】以下、図面を参照しながら本発明の一実施例
を説明する。図２は本発明の感熱記録媒体の一実施例に
よる磁気カードの部分縦断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a partial vertical sectional view of a magnetic card according to an embodiment of the thermal recording medium of the present invention.
【００１３】図２において、基材１の一方の表面に、コ
ントラスト付与層２、増感層３、不可逆性感熱記録層
４、可逆性感熱記録層５、および耐摩性の保護層６がこ
の順序で形成されている。In FIG. 2, a contrast-imparting layer 2, a sensitizing layer 3, an irreversible heat-sensitive recording layer 4, a reversible heat-sensitive recording layer 5, and a wear-resistant protective layer 6 are arranged in this order on one surface of a substrate 1. Is formed by.
【００１４】なお可逆性感熱記録層５と保護層６との間
に、必要に応じて任意の視覚的記号またはパターンを形
成するための印刷層７を設けてもよい。A printing layer 7 for forming an arbitrary visual symbol or pattern may be provided between the reversible thermosensitive recording layer 5 and the protective layer 6, if necessary.
【００１５】基材１としては、たとえばポリエチレンテ
レフタレート、エポキシ樹脂、ポリ塩化ビニルおよびポ
リカーボネート等の合成樹脂シート、あるいは合成紙等
を用いることができる。As the base material 1, for example, a synthetic resin sheet such as polyethylene terephthalate, epoxy resin, polyvinyl chloride and polycarbonate, or synthetic paper can be used.
【００１６】コントラスト付与層２は、不可逆性感熱記
録層４に対して視覚的コントラストを有するもので、不
可逆性感熱記録層４が白色の金属薄層からなる場合に
は、この層に対して高いコントラストを示す黒色その他
の濃い色調であるのが好ましい。このようなコントラス
ト付与層２を形成するための材料としては、たとえば所
望の色彩の顔料または染料をバインダー樹脂、たとえば
ポリエステル系樹脂、アルキッド系樹脂、ビニル系樹
脂、ポリウレタン系樹脂またはそれらの混合樹脂に混入
したものを用いることができる。このコントラスト付与
層２の厚さは、たとえば２０μｍ以下であり、好ましく
は０．５〜１５μｍ程度である。The contrast-imparting layer 2 has a visual contrast with the irreversible thermosensitive recording layer 4, and is higher than this layer when the irreversible thermosensitive recording layer 4 is composed of a thin white metal layer. It is preferable that the color tone is black or other dark color tone showing contrast. As a material for forming such a contrast imparting layer 2, for example, a pigment or dye having a desired color is used as a binder resin, for example, a polyester resin, an alkyd resin, a vinyl resin, a polyurethane resin, or a mixed resin thereof. A mixed substance can be used. The contrast-imparting layer 2 has a thickness of, for example, 20 μm or less, preferably about 0.5 to 15 μm.
【００１７】増感層３は、不可逆性感熱記録層４の書込
み記録特性を向上させる増感作用を与えるとともに、こ
の書込み時に溶融した金属薄層構成材料の細粒を分散さ
せて受容するために設けられたもので、その材料として
は、たとえばセラック、ロジン、テルペン樹脂等の低融
点天然樹脂、さらにはニトロセルロース系樹脂、アクリ
ル系樹脂、ポリエステル系樹脂、塩化ビニル系樹脂、塩
化ビニリデン系樹脂、酢酸ビニル系樹脂、ポリスチレン
系樹脂、ポリブチラール系樹脂、ポリオレフィン系樹脂
等の合成樹脂、あるいはこれらの組合せを主成分とし、
これに必要に応じてパラフィンワックス、マイクロクリ
スタリンワックス、合成酸化ワックス、モンタンワック
ス、フィッシャートロプシュワックス、低分子ポリエチ
レンワックス、パラフィンワックス誘導体、モンタンワ
ックス誘導体、マイクロクリスタリンワックス誘導体等
のワックス；および低粘度化添加剤としてのステアリン
酸、ステアリン酸塩等を添加したものを用いることがで
きる。この低粘度化添加剤は、微粒子の形態のものは主
成分に分散して用い、固形のものは溶剤に溶解するか、
または加熱により溶融して主成分と混合または相溶させ
て用いる。また塗料として塗布する際には、他の層を侵
すことのない溶剤を使用することが必要であり、たとえ
ばグリコールエーテル系やアルコール系等の溶剤から適
宜選択するのが好ましい。この増感層３の厚さは、それ
ぞれ１０μｍ以下が好ましく、とくに０．５〜５μｍ程
度が好ましい。The sensitizing layer 3 has a sensitizing action for improving the writing and recording characteristics of the irreversible thermosensitive recording layer 4, and also serves to disperse and accept fine particles of the metal thin layer constituting material melted at the time of writing. Provided, as the material, for example, a low melting point natural resin such as shellac, rosin, terpene resin, nitrocellulose resin, acrylic resin, polyester resin, vinyl chloride resin, vinylidene chloride resin, Synthetic resin such as vinyl acetate-based resin, polystyrene-based resin, polybutyral-based resin, polyolefin-based resin, or a combination thereof, as a main component,
If necessary, waxes such as paraffin wax, microcrystalline wax, synthetic oxide wax, montan wax, Fischer-Tropsch wax, low molecular weight polyethylene wax, paraffin wax derivative, montan wax derivative, and microcrystalline wax derivative; It is possible to use those to which stearic acid, stearate or the like as an agent is added. This viscosity reducing additive is used in the form of fine particles dispersed in the main component, and the solid one dissolved in a solvent,
Alternatively, it is melted by heating and mixed or compatible with the main component before use. Further, when applying as a paint, it is necessary to use a solvent that does not attack other layers, and it is preferable to appropriately select from, for example, glycol ether or alcohol solvents. The thickness of the sensitizing layer 3 is preferably 10 μm or less, and particularly preferably about 0.5 to 5 μm.
【００１８】不可逆性感熱記録層４は、書換え不能な書
込み記録膜として用いられるもので、コントラスト付与
層２を隠蔽するように蒸着によって形成されたスズの薄
層からなっている。このた不可逆性感熱記録層４を熱的
に破壊するのに必要な加熱温度Ｔ4は約３００℃であ
る。The irreversible thermosensitive recording layer 4 is used as a non-rewritable writing recording film, and is composed of a thin layer of tin formed by vapor deposition so as to cover the contrast imparting layer 2. The heating temperature T4 required to thermally destroy the irreversible thermosensitive recording layer 4 is about 300 ° C.
【００１９】保護層６は、磁気カードの表面を保護する
ためのもので、たとえばセルロース系樹脂、ウレタン系
樹脂、ポリエステル系樹脂、ビニル系樹脂、エポキシ系
樹脂、アクリル系樹脂等の耐摩耗性および耐熱性の良好
な材料によって形成される。これらの樹脂には、可塑剤
としてフタル酸エステル、脂肪酸エステル、リン酸エス
テル等を添加することができ、また滑性を付与するもの
として、低分子ポリエチレン、オレイルアマイド、ステ
アリルアマイド、シリコーン等を添加することができ
る。さらに塗料として塗布する際には、他の層を侵すこ
とのない溶剤を使用することが必要であり、たとえばグ
リコールエーテル系やアルコール系等の溶剤から適宜選
択するのが好ましい。なお、使用する溶剤の量を少なく
するために、アクリル系、エポキシ系、ポリエステル系
等の紫外線硬化型樹脂や電子線硬化型樹脂を用いること
ができる。この保護層６の厚さは、たとえば１０μｍ以
下、好ましくは１〜５μｍ程度である。The protective layer 6 is for protecting the surface of the magnetic card, and is made of, for example, cellulose resin, urethane resin, polyester resin, vinyl resin, epoxy resin, acrylic resin, etc. It is formed of a material having good heat resistance. To these resins, phthalic acid ester, fatty acid ester, phosphoric acid ester or the like can be added as a plasticizer, and low molecular weight polyethylene, oleyl amide, stearyl amide, silicone or the like can be added to impart lubricity. can do. Furthermore, when applying as a paint, it is necessary to use a solvent that does not attack other layers, and it is preferable to appropriately select from, for example, glycol ether or alcohol solvents. In addition, in order to reduce the amount of the solvent to be used, an ultraviolet curable resin such as an acrylic resin, an epoxy resin, a polyester resin or an electron beam curable resin can be used. The protective layer 6 has a thickness of, for example, 10 μm or less, preferably about 1 to 5 μm.
【００２０】可逆性感熱記録層５は、前述のマトリック
スと有機低分子物質を主体とするの混合物を有機溶媒に
溶解し、適当な厚さに塗布したのち乾燥することにより
形成される。好ましい配合例は下記のとおりである。The reversible thermosensitive recording layer 5 is formed by dissolving a mixture of the above-mentioned matrix and an organic low molecular weight substance in an organic solvent, applying the mixture to an appropriate thickness, and then drying. A preferred formulation example is as follows.
【００２１】 （配合例１） 塩化ビニル／酢酸ビニル共重合体 （ＵＣＣ社製「VYHH」） １０．０重量部 ドコサン酸 １０．０重量部 界面活性剤（住友３Ｍ社製「ＦＣ−４３０」） ０．１重量部 ＭＥＫ ６０．０重量部 アノン ６０．０重量部 （配合例２） 塩化ビニル／酢酸ビニル共重合体 （ＵＣＣ社製「VYHH」） １０．０重量部 ドコサン酸 ５．０重量部 ステアリスステアレート ５．０重量部 界面活性剤（住友３Ｍ社製「ＦＣ−４３０」） ０．１重量部 ＭＥＫ ４０．０重量部 トルエン ４０．０重量部 アノン ４０．０重量部 （配合例３） 塩化ビニル／酢酸ビニル共重合体 （ＵＣＣ社製「VYHH」） １０．０重量部 ドコサノイックアミン １０．０重量部 界面活性剤（住友３Ｍ社製「ＦＣ−４３０」） ０．１重量部 ＭＥＫ ６０．０重量部 アノン ６０．０重量部 上記のような配合の混合物は、ボールミルで４時間分散
したのち、バーコーター＃２０で所望の厚さに塗布後乾
燥することによって可逆性感熱記録層５を形成するため
に使用された。乾燥後の可逆性感熱記録層５の厚さは約
４〜６μmであった。また図１に示したＴ1〜Ｔ3の値の
実測値は、 Ｔ1 ７０℃ Ｔ2 ８０℃ Ｔ3 １１０℃ であった。(Formulation Example 1) Vinyl chloride / vinyl acetate copolymer (UCV "VYHH") 10.0 parts by weight Docosanoic acid 10.0 parts by weight Surfactant (Sumitomo 3M "FC-430") 0.1 parts by weight MEK 60.0 parts by weight Anone 60.0 parts by weight (Formulation Example 2) Vinyl chloride / vinyl acetate copolymer ("VYHH" manufactured by UCC) 10.0 parts by weight Docosanoic acid 5.0 parts by weight Stearis stearate 5.0 parts by weight Surfactant (“FC-430” manufactured by Sumitomo 3M Ltd.) 0.1 parts by weight MEK 40.0 parts by weight Toluene 40.0 parts by weight Anone 40.0 parts by weight (Compounding Example 3 ) Vinyl chloride / vinyl acetate copolymer ("VYHH" manufactured by UCC) 10.0 parts by weight Docosanoic amine 10.0 parts by weight Surfactant (Sumitomo 3M "FC-430") 0.1 parts by weight MEK 60.0 parts by weight Non 60.0 parts by weight The mixture having the above composition was dispersed in a ball mill for 4 hours, and then coated with a bar coater # 20 to a desired thickness and dried to form a reversible thermosensitive recording layer 5. Was used. The thickness of the reversible thermosensitive recording layer 5 after drying was about 4 to 6 μm. The measured values of T1 to T3 shown in FIG. 1 were T1 70 ° C. T2 80 ° C. T3 110 ° C.
【００２２】[0022]
【発明の効果】以上のようにこの発明の磁気記録媒体
は、感熱記録手段によって情報を不可逆的に記録するた
めの不可逆性感熱記録層と、同じく感熱記録手段によっ
て情報を可逆的に、すなわち書換え可能に記録するため
の可逆性感熱記録層とを備えているので、書換え可能な
情報と、書換え不可能な情報の２種の情報を同一の、ま
たは異なる領域に記録することができ、磁気記録媒体と
しての多様な用途に対応することができる。As described above, the magnetic recording medium of the present invention has an irreversible heat-sensitive recording layer for irreversibly recording information by the heat-sensitive recording means, and reversibly, that is, rewriting information by the heat-sensitive recording means. Since the reversible thermosensitive recording layer for recording is possible, two kinds of information, rewritable information and non-rewritable information, can be recorded in the same or different areas, and magnetic recording is possible. It can be used for various purposes as a medium.
【図１】本発明の磁気記録媒体に用いられた可逆性感熱
記録層の加熱温度と透明度との関係を示すグラフ。FIG. 1 is a graph showing the relationship between the heating temperature and the transparency of a reversible thermosensitive recording layer used in the magnetic recording medium of the present invention.
【図２】本発明の一実施例による磁気記録媒体の部分縦
断面図。FIG. 2 is a partial vertical sectional view of a magnetic recording medium according to an embodiment of the present invention.
１ 基材 ２ コントラスト付与層 ３ 増感層 ４ 不可逆性感熱記録層 ５ 可逆性感熱記録層 ６ 保護層 ７ 印刷層 DESCRIPTION OF SYMBOLS 1 Base material 2 Contrast providing layer 3 Sensitization layer 4 Irreversible thermosensitive recording layer 5 Reversible thermosensitive recording layer 6 Protective layer 7 Printing layer
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ１１Ｂ 23/00 Ｎ 7201−5Ｄ 23/40 Ｚ 7201−5Ｄ 23/44 Ａ 7201−5Ｄ (72)発明者 中原 義彦 東京都文京区小石川四丁目14番12号 共同 印刷株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display location G11B 23/00 N 7201-5D 23/40 Z 7201-5D 23/44 A 7201-5D (72) Inventor Yoshihiko Nakahara 4-14-12 Koishikawa, Bunkyo-ku, Tokyo Kyodo Printing Co., Ltd.
Claims (2)
ラスト付与層、増感層、不可逆性感熱記録層、可逆性感
熱記録層および保護層を備えていることを特徴とする磁
気記録媒体。1. A magnetic recording medium comprising a contrast-imparting layer, a sensitizing layer, an irreversible thermosensitive recording layer, a reversible thermosensitive recording layer and a protective layer which are sequentially provided on one surface of a substrate. ..
るマトリックスに、有機低分子物質を混合した混合物か
らなる層である請求項１記載の磁気記録媒体。2. The magnetic recording medium according to claim 1, wherein the reversible thermosensitive recording layer is a layer formed of a mixture of a polymer matrix and an organic low molecular weight substance.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3144135A JP2865217B2 (en) | 1991-05-21 | 1991-05-21 | Magnetic recording media |
| TW081103726A TW203137B (en) | 1991-05-21 | 1992-05-14 | |
| KR1019920008531A KR960013018B1 (en) | 1991-05-21 | 1992-05-20 | Visible information heat sensitive recording medium |
| GB9210712A GB2256496B (en) | 1991-05-21 | 1992-05-20 | Visible information heat sensitive recording medium |
| AU17037/92A AU659838B2 (en) | 1991-05-21 | 1992-05-20 | Visible information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3144135A JP2865217B2 (en) | 1991-05-21 | 1991-05-21 | Magnetic recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05139079A true JPH05139079A (en) | 1993-06-08 |
| JP2865217B2 JP2865217B2 (en) | 1999-03-08 |
Family
ID=15355036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3144135A Expired - Fee Related JP2865217B2 (en) | 1991-05-21 | 1991-05-21 | Magnetic recording media |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2865217B2 (en) |
| KR (1) | KR960013018B1 (en) |
| AU (1) | AU659838B2 (en) |
| GB (1) | GB2256496B (en) |
| TW (1) | TW203137B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0725148A (en) * | 1993-07-13 | 1995-01-27 | Mitsubishi Paper Mills Ltd | Reversible thermal composite recording material |
| US5559314A (en) * | 1993-09-22 | 1996-09-24 | Kabushiki Kaisha Toshiba | Recording medium using reversible recording material and method of processing record to recording medium |
| JP2019171697A (en) * | 2018-03-28 | 2019-10-10 | 共同印刷株式会社 | Heat-sensitive recording medium and printing method thereof |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2703808B1 (en) * | 1993-04-08 | 1995-05-24 | Gemplus Card Int | Method for authenticating a chip medium and medium allowing such authentication. |
| US6201587B1 (en) | 1996-02-13 | 2001-03-13 | Dai Nippon Printing Co., Ltd. | Apparatus having a rewritable display portion |
| US7123312B2 (en) | 1996-02-13 | 2006-10-17 | Dai Nippon Printing Co., Ltd. | Apparatus having a rewritable display portion |
| JPH1049053A (en) * | 1996-08-02 | 1998-02-20 | Dainippon Printing Co Ltd | Reversible display label for recording media |
| US6362130B1 (en) * | 1997-09-04 | 2002-03-26 | Ricoh Company, Ltd. | Reversible thermosensitive recording medium, card, label, disk, disk cartridge, tape cassette, method of producing the recording medium, and method of recording and erasing images using the same |
| ES2160031B1 (en) * | 1999-02-01 | 2002-06-16 | Obiol Mendez Juan Antonio | DATA SUPPORT CARD. |
| EP1489540A4 (en) * | 2002-03-08 | 2008-05-14 | Dainippon Printing Co Ltd | Information providing system and paper-shaped display medium |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0262287A (en) * | 1988-08-30 | 1990-03-02 | Kyodo Printing Co Ltd | Thermal recording method, thermal recording medium used therefor and preparation thereof |
| JP2728214B2 (en) * | 1989-01-20 | 1998-03-18 | 共同印刷株式会社 | Thermal recording medium |
-
1991
- 1991-05-21 JP JP3144135A patent/JP2865217B2/en not_active Expired - Fee Related
-
1992
- 1992-05-14 TW TW081103726A patent/TW203137B/zh active
- 1992-05-20 GB GB9210712A patent/GB2256496B/en not_active Expired - Fee Related
- 1992-05-20 KR KR1019920008531A patent/KR960013018B1/en not_active IP Right Cessation
- 1992-05-20 AU AU17037/92A patent/AU659838B2/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0725148A (en) * | 1993-07-13 | 1995-01-27 | Mitsubishi Paper Mills Ltd | Reversible thermal composite recording material |
| US5559314A (en) * | 1993-09-22 | 1996-09-24 | Kabushiki Kaisha Toshiba | Recording medium using reversible recording material and method of processing record to recording medium |
| US5597998A (en) * | 1993-09-22 | 1997-01-28 | Kabushiki Kaisha Toshiba | Recording medium using reversible recording material and method of processing record to recording medium |
| JP2019171697A (en) * | 2018-03-28 | 2019-10-10 | 共同印刷株式会社 | Heat-sensitive recording medium and printing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2865217B2 (en) | 1999-03-08 |
| GB2256496A (en) | 1992-12-09 |
| AU1703792A (en) | 1992-11-26 |
| TW203137B (en) | 1993-04-01 |
| AU659838B2 (en) | 1995-06-01 |
| GB2256496B (en) | 1994-10-19 |
| KR920022219A (en) | 1992-12-19 |
| GB9210712D0 (en) | 1992-07-08 |
| KR960013018B1 (en) | 1996-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |