NL7512181A - Magnetisch optekenmedium en werkwijze voor de vervaardiging ervan. - Google Patents

Magnetisch optekenmedium en werkwijze voor de vervaardiging ervan.

Info

Publication number
NL7512181A
NL7512181A NL7512181A NL7512181A NL7512181A NL 7512181 A NL7512181 A NL 7512181A NL 7512181 A NL7512181 A NL 7512181A NL 7512181 A NL7512181 A NL 7512181A NL 7512181 A NL7512181 A NL 7512181A
Authority
NL
Netherlands
Prior art keywords
manufacture
recording medium
magnetic recording
magnetic
medium
Prior art date
Application number
NL7512181A
Other languages
English (en)
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
Publication of NL7512181A publication Critical patent/NL7512181A/nl

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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
    • G06K1/125—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by magnetic means
    • 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
    • G06K19/02—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the selection of materials, e.g. to avoid wear during transport through the machine
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
    • G11B20/00123—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature 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
    • G11B23/30—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 with provision for auxiliary signals
    • G11B23/36—Signals on record carriers or on containers and recorded by the same method as the main recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • 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
    • 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
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • 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
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • G11B5/842—Coating a support with a liquid magnetic dispersion
    • G11B5/845—Coating a support with a liquid magnetic dispersion in a magnetic field

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
NL7512181A 1974-10-16 1975-10-16 Magnetisch optekenmedium en werkwijze voor de vervaardiging ervan. NL7512181A (nl)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4474774A GB1529566A (en) 1974-10-16 1974-10-16 Magnetic recording
GB254675 1975-01-21

Publications (1)

Publication Number Publication Date
NL7512181A true NL7512181A (nl) 1976-04-21

Family

ID=26237585

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7512181A NL7512181A (nl) 1974-10-16 1975-10-16 Magnetisch optekenmedium en werkwijze voor de vervaardiging ervan.

Country Status (5)

Country Link
JP (1) JPS5165605A (nl)
DE (1) DE2545580A1 (nl)
FR (1) FR2288369A1 (nl)
GB (1) GB1529566A (nl)
NL (1) NL7512181A (nl)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242400A (en) * 1977-10-15 1980-12-30 E M I Limited Magnetically structured materials
JPS5552564A (en) * 1978-10-13 1980-04-17 Sony Corp Check unit for suitability of stuck label of tape cassette
DE2922882A1 (de) * 1979-06-06 1980-12-11 Stockburger H Verfahren zur sicherung von tontraegern und deren etiketten und/oder verpackung gegen nachahmung
NZ199275A (en) * 1980-12-16 1984-11-09 Minnesota Mining Mfg Australia Verification of recorded messages
FR2515403A1 (fr) * 1981-10-28 1983-04-29 Quadrivium Inf Procede d'identification d'un enregistrement sonore et installation de duplication mettant en oeuvre le procede
FR2534433B1 (fr) * 1982-10-08 1986-04-11 Thomson Csf Procede de protection d'une sequence d'images video contre une utilisation frauduleuse et dispositifs pour la mise en oeuvre de ce procede
DE3319343A1 (de) * 1982-11-08 1984-05-10 Vault Corp Verfahren und vorrichtung zur unmoeglichmachung nichtgenehmigter kopien von aufgezeichneten daten
EP0110511B1 (en) * 1982-11-22 1988-03-02 Dysan Corporation Method and apparatus for authenticating memory disk
AT378620B (de) * 1983-08-11 1985-09-10 Heinz Seidl Magnetogrammtraeger, dessen herkunft unentfernbar gekennzeichnet ist
JPH0512068Y2 (nl) * 1985-02-27 1993-03-26
JPH0512067Y2 (nl) * 1985-02-27 1993-03-26
AU582216B2 (en) * 1985-03-18 1989-03-16 Minnesota Mining And Manufacturing Company Method of ensuring authenticity of recorded information
JP2569294Y2 (ja) * 1991-01-25 1998-04-22 日産自動車株式会社 線条体用プロテクター

Also Published As

Publication number Publication date
JPS5165605A (nl) 1976-06-07
GB1529566A (en) 1978-10-25
FR2288369A1 (fr) 1976-05-14
DE2545580A1 (de) 1976-05-06

Similar Documents

Publication Publication Date Title
NL7707769A (nl) Magnetisch registratiemedium en werkwijze voor het vervaardigen daarvan.
NL7702576A (nl) Magnetisch registratiemateriaal, alsmede werkwijze voor de vervaardiging daarvan.
NL7809950A (nl) Magnetisch registratiemedium.
NL7507642A (nl) Informatiedrager en werkwijze voor het uitlezen daarvan.
SE406828B (sv) Medium for magnetisk uppteckning
NL7702570A (nl) Magneetschijfgeheugen en magneetschijf voor dat geheugen.
IT1049680B (it) Apparecchio per la registrazione e la riproduzione magnetica
IT1026313B (it) Apparecchio di riproduzione e oppure registrazione magnetica
NL7805988A (nl) Magnetisch registratiemedium.
NL7711724A (nl) Magnetisch registratiemedium.
IT947460B (it) Apparato magnetico di registrazio ne e o riproduzione
NL180053C (nl) Werkwijze voor de vervaardiging van magnetische schijven.
NL7512181A (nl) Magnetisch optekenmedium en werkwijze voor de vervaardiging ervan.
NL7508415A (nl) Magnetische registreerinrichting.
IT1029752B (it) Apparecchio di registrazione e oppure riproduzione magnetica
AT355826B (de) Magnetisierbares aufzeichnungsmedium und verfahren zu seiner herstellung
IT999494B (it) Apparato magnetico di registrazione e.o di riproduzione
NL162419C (nl) Magnetisch medium.
NL7508227A (nl) Magnetische registreerinrichting.
NL7507761A (nl) Opneem- of weergeef-toestel.
SE387459B (sv) Medium for magnetisk uppteckning
NL7706922A (nl) Magnetisch registratiemedium.
IT1041037B (it) Macchina di registrazione e riproduzione
NL7510359A (nl) Werkwijze en inrichting voor electrostatische reproductie.
NL7700107A (nl) Magnetisch registreermedium alsmede methode voor de vervaardiging ervan.

Legal Events

Date Code Title Description
BV The patent application has lapsed