GB1568510A - Information-storage media - Google Patents
Information-storage media Download PDFInfo
- Publication number
- GB1568510A GB1568510A GB10598/76A GB1059876A GB1568510A GB 1568510 A GB1568510 A GB 1568510A GB 10598/76 A GB10598/76 A GB 10598/76A GB 1059876 A GB1059876 A GB 1059876A GB 1568510 A GB1568510 A GB 1568510A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- magnetic
- masking
- layer
- 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
- 238000000576 coating method Methods 0.000 claims description 113
- 239000011248 coating agent Substances 0.000 claims description 112
- 230000005291 magnetic effect Effects 0.000 claims description 57
- 230000000873 masking effect Effects 0.000 claims description 40
- 239000011230 binding agent Substances 0.000 claims description 31
- 239000010410 layer Substances 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 239000002904 solvent Substances 0.000 claims description 10
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011241 protective layer Substances 0.000 claims description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000006249 magnetic particle Substances 0.000 claims description 4
- 150000002148 esters Chemical class 0.000 claims description 3
- 150000002576 ketones Chemical class 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 claims description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 claims description 2
- 239000003431 cross linking reagent Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- -1 for example Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000011253 protective coating Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 239000012463 white pigment Substances 0.000 claims description 2
- 239000000758 substrate Substances 0.000 description 8
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/72—Protective coatings, e.g. anti-static or antifriction
-
- 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
- G06K19/06187—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 with magnetically detectable marking
- G06K19/06196—Constructional details
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/80—Card carriers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Magnetic Record Carriers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Credit Cards Or The Like (AREA)
- Paints Or Removers (AREA)
Description
(54) IMPROVEMENTS IN AND RELATING TO
INFORMATION-STORAGE MEDIA
(71) We, RACAL-ZONAL LIMITED, a British Company, of Western Road,
Bracknell, Berkshire, England, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which is to be performed, to be particularly described in and by the follow mg statement:
This invention relates to information storage media.
According to the invention, there is provided an information storage medium, comprising a sheet of paper, a magnetic coating formed over the whole of one surface of the paper sheet, and a masking coating formed over the magnetic coating, the magnetic coating and masking coating respectively serving to store information in a magnetically readable and an optically readable manner.
According to the invention, there is also provided an information-storage medium, comprising a sheet of paper, a magnetic coating formed over the whole of surface of the paper sheet for magnetically storing information, and an opaque masking coating formed over the whole of one surface of the magnetic coating, the magnetic coating and the masking coating being formed by layers which have been successively applied to the paper sheet.
According to the invention, there is further provided a method of producing an information-storage medium, comprising the steps of coating magnetic particles in a settable liquid binder onto a sheet of paper, setting the binder to form a solid, flexible, magnetic coating over the whole of one surface of the paper sheet, and applying a flexible, opaque, masking coating over the whole of one surface of the magnetic coating.
An information storage medium embodying the invention, and a method employing the invention of producing an information storage medium, will now be described, by way of example, with reference to the accompanying diagrammatic drawing, the sole Figure of which is a cross-section of part of the storage medium.
As shown in the Figure, the storage medium comprises a substrate 1 carrying a magnetic coating 2. A masking coating 3 is applied over the coating 2 and comprises an opaque layer 4 and a clear protective layer 5. The relative thicknesses of the substrate 1 and coatings 2 and 3 are not shown to scale.
The substrate 1 is a thin flexibe paper sheet.
The magnetic coating 2 is formed by a uniform layer of magnetic oxide particles in a polymeric binder. The coating 2 may have a thickness of between 300 and 1000 microinches but is preferably 400 to 700 microinches thick. Any suitable method can be used to form the magnetic coating 2 on the substrate 1; for example, the magnetic oxide particles may be contained in a settable liquid binder (for example, a polyurethane binder) which includes a volatile solvent (for example, tetrahydrofuran or cyclohex anone), the liquid binder being first applied to the substrate and subsequently set by heating or by air-flow drying to drive off the volatile solvent. The liquid binder may contain small amounts of diluents such as, for example, ketones, esters and aromatic hydrocarbons. Before setting of the binder the magnetic oxide particles will, in general, by aligned in a common direction using an external magnetic field. The formed magnetic coating 2 is flexible. Although the substrate 1 is illustrated as only coated on one side with the coating 2. both sides of the substrate 2 can be so coated if desired.
The masking coating 3 is applied on top of the magnetic coating 2 subsequent to the formation of the coating 2 on the substrate 1. The layer 4 of the masking coating 3 is sufficiently thick to mask the magnetic coating 2 which is generally brown in colour.
The layer 4 is preferably a white (or other suitable colour) opaque layer and, for example, is formed by applying a settable liquid binder comprising a volatile solvent, a binder and a white pigment (such as, for example, titanium dioxide) on top of the magnetic coating and then driving off the solvent to leave the white layer 4. The liquid binder used for the layer 4 should be selected to give good adhesion to the magnetic coating 2 while not affecting the uniformity of the magnetic coating. The liquid binder may, for example, contain a binder which is soluble in esters and ketones such as ethyl acetate, butyl acetate, methyl ethyl ketone and methyl isobutyl ketone; these solvents do not dissolve the magnetic coating 2. In general, the layer 4 may be arranged so as not to attack the magnetic coating 2 by providing that (a) the binder systems of the coating 2 and the layer 4 are the same or similar and have similar solubilities except that the coating 2 has been insolubilised by the addition of a crosslinking agent, or (b) the coating 2 contains a binder system which is not affected by the solvents of the layer 4. In either case the layer 4 may or may not also be crosslinked.
The layer 4 is flexible and can be written or printed upon in an optically readable manner.
Both the magnetic coating 2 and the masking coating 3 can be applied by precision coating techniques such as, for example, extrusion, gravure, reverse roll, meyer bar or doctor blade.
The protective layer 5, the presence of which is optional, is applied on top of the masking coating and is preferably a flexible, clear, protective coating.
The total thickness of the masking coating 3 should be such as to avoid difficulty in detecting information magnetically stored in the coating 2 as a result of the coating 2 being spaced from a magnetic pick-up head by the thickness of the coating 3. Thus. the total thickness of the masking coating should not (a) be so thick as to prevent the effective recording and replaying of magnetic information becuase of a too large separation between the magnetic recording head and the magnetic coating 2 nor (b) so thin that the magnetic coating 2 clearly shows through the masking coating 3. The coating 3 may have a thickness of between 300 and 1,500 microinches but is preferably 400 to 700 microinches thick.
Information can be stored on the storage medium in two forms, firstly in an opticallyreadable form by writing or printing either directly on the masking layer 4. or (as in the illustrated storage medium) on the protective layer 5, and secondly in a magneticallyreadable form on magnetic coating 2. The
surface texture of the masking coating 3
may, for example, be arranged to be suit
able for printing upon and/or to be written
on without difficulty by ball-point pen, ink
or graphite. Information can be stored in
the coating 2 by any suitable magnetic
recording method and can be replayed,
erased and updated a number of times.
The information-storage medium de
scribed can be handled as an ordinary paper
sheet and can thus be advantageously used
in security printing to facilitate automatic
accounting and security checking.
WHAT WE CLAIM IS:
1. An information-storage medium,
comprising a sheet of paper, a magnetic
coating formed over the whole of one
surface of the paper sheet, and a masking
coating formed over the whole of one
surface of the magnetic coating, the magne
tic coating and masking coating respectively
serving to store information in a magnetical
ly readable and an optically readable
manner.
2. A medium according to claim 1, in which the masking coating comprises an opaque layer.
3. An information-storage medium, comprising a sheet of paper, a magnetic coating formed over the whole of one surface of the paper sheet for magnetically
storing information, and an opaque masking
coating formed over the whole of one
surface of the magnetic coating, the magne
tic coating and the masking coating being
formed by layers which have been succes
sively applied to the paper sheet.
4. A medium according to claim 3, in which the opaque masking coating is adapted to receive and display optically readable printing thereupon.
5. A medium according to any preceding claim, in which the masking coating has a protective covering material.
6. A method of producing an information-storage medium, comprising the steps of coating magnetic particles in a settable liquid binder onto a sheet of paper, setting the binder to form a solid, flexible, magnetic coating over the whole of one surface of the paper sheet, and applying a flexible, opaque, masking coating over the whole of one surface of the magnetic coating.
7. A method according to claim 6, in which the masking coating is applied in a settable liquid binder, the two sald binders being substantially similar exept that the
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
1. An information-storage medium,
comprising a sheet of paper, a magnetic
coating formed over the whole of one
surface of the paper sheet, and a masking
coating formed over the whole of one
surface of the magnetic coating, the magne
tic coating and masking coating respectively
serving to store information in a magnetical
ly readable and an optically readable
manner.
2. A medium according to claim 1, in which the masking coating comprises an opaque layer.
3. An information-storage medium, comprising a sheet of paper, a magnetic coating formed over the whole of one surface of the paper sheet for magnetically
storing information, and an opaque masking
coating formed over the whole of one
surface of the magnetic coating, the magne
tic coating and the masking coating being
formed by layers which have been succes
sively applied to the paper sheet.
4. A medium according to claim 3, in which the opaque masking coating is adapted to receive and display optically readable printing thereupon.
5. A medium according to any preceding claim, in which the masking coating has a protective covering material.
6. A method of producing an information-storage medium, comprising the steps of coating magnetic particles in a settable liquid binder onto a sheet of paper, setting the binder to form a solid, flexible, magnetic coating over the whole of one surface of the paper sheet, and applying a flexible, opaque, masking coating over the whole of one surface of the magnetic coating.
7. A method according to claim 6, in which the masking coating is applied in a settable liquid binder, the two sald binders being substantially similar exept that the
binder of the magnetic particles has been
insolubilised.
8. An information-storage medium sub
stantially as described with reference to the accompanying drawing.
9. A method according to claim 6 and substantially as descibed with reference to the accompanying drawings.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB10598/76A GB1568510A (en) | 1977-03-04 | 1977-03-04 | Information-storage media |
| DE19772710202 DE2710202A1 (en) | 1977-03-04 | 1977-03-09 | MEANS OF STORAGE OF INFORMATION AND METHODS OF PREPARING IT |
| BE175840A BE852532A (en) | 1977-03-04 | 1977-03-16 | IMPROVEMENTS RELATING TO INFORMATION STORAGE VEHICLES |
| FR7707865A FR2344919A1 (en) | 1977-03-04 | 1977-03-16 | IMPROVEMENTS RELATING TO INFORMATION STORAGE VEHICLES |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB10598/76A GB1568510A (en) | 1977-03-04 | 1977-03-04 | Information-storage media |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1568510A true GB1568510A (en) | 1980-05-29 |
Family
ID=9970797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10598/76A Expired GB1568510A (en) | 1977-03-04 | 1977-03-04 | Information-storage media |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE852532A (en) |
| DE (1) | DE2710202A1 (en) |
| FR (1) | FR2344919A1 (en) |
| GB (1) | GB1568510A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2195270A (en) * | 1986-08-22 | 1988-04-07 | Plessey Co Plc | Marking of articles with photochromic compounds |
| GB2243139A (en) * | 1990-03-21 | 1991-10-23 | Adhesive Materials Ltd | Tamper-proof labels |
| EP1239307A1 (en) * | 2001-03-09 | 2002-09-11 | Sicpa Holding S.A. | Magnetic thin film interference device |
| WO2003102926A1 (en) * | 2002-05-29 | 2003-12-11 | Arjo Wiggins Limited | Multi-layer sheet product |
| US7056861B2 (en) | 2000-06-02 | 2006-06-06 | Wolfgang Bossert | Flat material especially in the form of a sheet or a strip and device for writing on said material |
| DE10027574B4 (en) * | 2000-06-02 | 2012-11-22 | Wolfgang Bossert | Flat material, in particular as a sheet-shaped sheet or web |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2438420A1 (en) * | 1978-10-12 | 1980-05-09 | Porcher Alain | METHOD FOR IDENTIFYING ANIMALS OR OBJECTS AND MEANS FOR IMPLEMENTING IT |
| EP0071933A1 (en) * | 1981-08-03 | 1983-02-16 | E.I. Du Pont De Nemours And Company | Identification member |
| DE3422908C2 (en) * | 1984-06-20 | 1986-04-30 | Leonhard Kurz GmbH & Co, 8510 Fürth | Embossing foil, in particular hot stamping foil, with a surface that can be written on |
| DE3422911C1 (en) * | 1984-06-20 | 1985-09-05 | Leonhard Kurz GmbH & Co, 8510 Fürth | Stamping foil, in particular hot stamping foil, with a magnetic layer |
| US4838648A (en) * | 1988-05-03 | 1989-06-13 | Optical Coating Laboratory, Inc. | Thin film structure having magnetic and color shifting properties |
-
1977
- 1977-03-04 GB GB10598/76A patent/GB1568510A/en not_active Expired
- 1977-03-09 DE DE19772710202 patent/DE2710202A1/en not_active Withdrawn
- 1977-03-16 FR FR7707865A patent/FR2344919A1/en active Granted
- 1977-03-16 BE BE175840A patent/BE852532A/en unknown
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2195270A (en) * | 1986-08-22 | 1988-04-07 | Plessey Co Plc | Marking of articles with photochromic compounds |
| US4927180A (en) * | 1986-08-22 | 1990-05-22 | Plessey Overseas Limited | Marking of articles with photochromic compounds |
| GB2195270B (en) * | 1986-08-22 | 1990-05-23 | Plessey Co Plc | Marking of articles with photochromic compounds |
| GB2243139A (en) * | 1990-03-21 | 1991-10-23 | Adhesive Materials Ltd | Tamper-proof labels |
| US7056861B2 (en) | 2000-06-02 | 2006-06-06 | Wolfgang Bossert | Flat material especially in the form of a sheet or a strip and device for writing on said material |
| DE10027574B4 (en) * | 2000-06-02 | 2012-11-22 | Wolfgang Bossert | Flat material, in particular as a sheet-shaped sheet or web |
| EP1239307A1 (en) * | 2001-03-09 | 2002-09-11 | Sicpa Holding S.A. | Magnetic thin film interference device |
| WO2002073250A2 (en) * | 2001-03-09 | 2002-09-19 | Sicpa Holding S.A. | Magnetic thin film interference device or pigment and method of making it, printing ink or coating composition, security document and use of such a magnetic thin film interference device |
| WO2002073250A3 (en) * | 2001-03-09 | 2003-04-24 | Sicpa Holding Sa | Magnetic thin film interference device or pigment and method of making it, printing ink or coating composition, security document and use of such a magnetic thin film interference device |
| EA005456B1 (en) * | 2001-03-09 | 2005-02-24 | Сикпа Холдинг С.А. | Magnetic thin film interference device or pigment and method of making it, printing ink or coating composition, security document and use of such a magnetic thin film interference device |
| AU2002250945B2 (en) * | 2001-03-09 | 2006-11-16 | Sicpa Holding Sa | Magnetic thin film interference device or pigment and method of making it, printing ink or coating composition, security document and use of such a magnetic thin film interference device |
| WO2003102926A1 (en) * | 2002-05-29 | 2003-12-11 | Arjo Wiggins Limited | Multi-layer sheet product |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2344919B3 (en) | 1980-02-29 |
| DE2710202A1 (en) | 1977-09-29 |
| BE852532A (en) | 1977-09-16 |
| FR2344919A1 (en) | 1977-10-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |