GB1516832A - Security document system - Google Patents

Security document system

Info

Publication number
GB1516832A
GB1516832A GB8831/74A GB883174A GB1516832A GB 1516832 A GB1516832 A GB 1516832A GB 8831/74 A GB8831/74 A GB 8831/74A GB 883174 A GB883174 A GB 883174A GB 1516832 A GB1516832 A GB 1516832A
Authority
GB
United Kingdom
Prior art keywords
magnetic
sensor
layer
gate
signals
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
Application number
GB8831/74A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMI Ltd
Original Assignee
EMI Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EMI Ltd filed Critical EMI Ltd
Priority to GB8831/74A priority Critical patent/GB1516832A/en
Publication of GB1516832A publication Critical patent/GB1516832A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G06K19/12—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 the marking being sensed by magnetic means
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

1516832 Credit cards and the like EMI Ltd 21 May 1975 [27 Feb 1974] 8831/74 Heading B6A [Also in Division G4] A security document has a coating 2 comprising magnetic and non-magnetic materials disposed in correlated patterns, e.g. a magnetic accicular γ Fe 2 O 3 layer 4 with inset stripes 3 of I.R. absorbtive C. The strips 3 may be below, or flush with the surface of layer 4, and may extend for the whole layer thickness (Fig. 4, not shown). An I.R. reflective layer 5 is provided. In alternatives, the non-magnetic material has U.V., I.R. or #-ray transmissive or reflective properties, or thermal or electrical properties which can be sensed. Verifying apparatus senses both the magnetic and non- magnetic materials and if the signals therefrom show correlated patterns, the document is taken as genuine. In Fig. 6, the apparatus has an I.R. source 7, I.R. sensor 8, D.C. magnetic field source 9 and a magnetic sensor 10. Strips 3 moving past sensor 8, or layer 4 moving past sensor 10 generate pulsed signals. These signals are balanced and delayed so that equal magnitude signals arrive simultaneously at differencing circuit 16, Fig. 8. The output from 16 is fed via integrator 17, threshold device 18 and invertor 19 to AND gate 20. One sensor output is also fed via integrator 21, threshold devices 22, 23 and invertor 24 to the gate. Device 25 applies a signal to the gate when the document has past the sensors. A verification signal issues at 26.
GB8831/74A 1975-05-21 1975-05-21 Security document system Expired GB1516832A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8831/74A GB1516832A (en) 1975-05-21 1975-05-21 Security document system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8831/74A GB1516832A (en) 1975-05-21 1975-05-21 Security document system

Publications (1)

Publication Number Publication Date
GB1516832A true GB1516832A (en) 1978-07-05

Family

ID=9860057

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8831/74A Expired GB1516832A (en) 1975-05-21 1975-05-21 Security document system

Country Status (1)

Country Link
GB (1) GB1516832A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2435778A1 (en) * 1978-08-01 1980-04-04 Pyral Soc SECURITY MAGNETIC RECORDING MEDIUM
GB2127479A (en) * 1982-09-18 1984-04-11 Sr John Maxwell Mullin Security device
DE3620369C1 (en) * 1986-06-18 1987-05-07 Rosorius Gerhard Thermally readable surface marking arrangement and method and device for their temperature activation
FR2598004A1 (en) * 1986-04-28 1987-10-30 Kodak Pathe ELEMENT FOR THE PRODUCTION OF CARDS WITH ENCODABLE TRACKS AND METHOD FOR OBTAINING THE ELEMENT

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2435778A1 (en) * 1978-08-01 1980-04-04 Pyral Soc SECURITY MAGNETIC RECORDING MEDIUM
GB2127479A (en) * 1982-09-18 1984-04-11 Sr John Maxwell Mullin Security device
FR2598004A1 (en) * 1986-04-28 1987-10-30 Kodak Pathe ELEMENT FOR THE PRODUCTION OF CARDS WITH ENCODABLE TRACKS AND METHOD FOR OBTAINING THE ELEMENT
WO1987006745A2 (en) * 1986-04-28 1987-11-05 Eastman Kodak Co Magnetic information-recording element and method of manufacture
WO1987006745A3 (en) * 1986-04-28 1987-11-19 Eastman Kodak Co Magnetic information-recording element and method of manufacture
US4899037A (en) * 1986-04-28 1990-02-06 Eastman Kodak Company Magnetic information-recording element and method of manufacture
DE3620369C1 (en) * 1986-06-18 1987-05-07 Rosorius Gerhard Thermally readable surface marking arrangement and method and device for their temperature activation
US4888475A (en) * 1986-06-18 1989-12-19 Gerhard Rosorius Thermally readable encoding and activation thereof

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19950520