AU3174284A - Magnetic recording with authenticity indicia - Google Patents

Magnetic recording with authenticity indicia

Info

Publication number
AU3174284A
AU3174284A AU31742/84A AU3174284A AU3174284A AU 3174284 A AU3174284 A AU 3174284A AU 31742/84 A AU31742/84 A AU 31742/84A AU 3174284 A AU3174284 A AU 3174284A AU 3174284 A AU3174284 A AU 3174284A
Authority
AU
Australia
Prior art keywords
magnetic recording
authenticity indicia
authenticity
indicia
recording
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.)
Abandoned
Application number
AU31742/84A
Inventor
Heinz Seidl
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.)
SEIDL H
Original Assignee
SEIDL H
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 SEIDL H filed Critical SEIDL H
Publication of AU3174284A publication Critical patent/AU3174284A/en
Abandoned legal-status Critical Current

Links

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
    • G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
    • G11B23/281—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs by changing the physical properties of the record carrier
    • 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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Magnetic Record Carriers (AREA)
AU31742/84A 1983-08-11 1984-08-09 Magnetic recording with authenticity indicia Abandoned AU3174284A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0290883A AT378620B (en) 1983-08-11 1983-08-11 MAGNETOGRAM CARRIER WHOSE ORIGIN IS NON-REMARKABLY MARKED
AT2908/83 1983-08-11

Publications (1)

Publication Number Publication Date
AU3174284A true AU3174284A (en) 1985-02-14

Family

ID=3542219

Family Applications (1)

Application Number Title Priority Date Filing Date
AU31742/84A Abandoned AU3174284A (en) 1983-08-11 1984-08-09 Magnetic recording with authenticity indicia

Country Status (4)

Country Link
EP (1) EP0139625A1 (en)
JP (1) JPS6059530A (en)
AT (1) AT378620B (en)
AU (1) AU3174284A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01154425U (en) * 1988-04-15 1989-10-24

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1529566A (en) * 1974-10-16 1978-10-25 Emi Ltd Magnetic recording
DE2520652A1 (en) * 1975-05-09 1976-11-18 Agfa Gevaert Ag Photograph marker fitted with electromagnetically actuated ram is desi - to operate at high speed with high constancy of impact force using leaf spring and electromagnet
DE2752895A1 (en) * 1976-12-06 1978-06-08 Emi Ltd METHOD FOR PRODUCING A MATERIAL LAYER, THE SURFACE OF WHICH HAS A SCANABLE PATTERN, AS WELL AS A SECURITY DOCUMENT SYSTEM
NL7705111A (en) * 1977-05-10 1978-11-14 Philips Nv MAGNETIC TAPE WITH OPTICALLY SIGNABLE MARKS AND METHOD OF MANUFACTURE OF SUCH TAPE.
DE3016677A1 (en) * 1980-04-30 1981-11-05 F.I.L.P. Fabbrica Isolanti Laminati Plastici S.p.A. Magnetic tape cassette with identification element - has non magnetic lead-in tape containing details of producer and recording

Also Published As

Publication number Publication date
ATA290883A (en) 1985-01-15
AT378620B (en) 1985-09-10
JPS6059530A (en) 1985-04-05
EP0139625A1 (en) 1985-05-02

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