JPS5634108A - Magnetic recording and reproducing apparatus - Google Patents

Magnetic recording and reproducing apparatus

Info

Publication number
JPS5634108A
JPS5634108A JP10798079A JP10798079A JPS5634108A JP S5634108 A JPS5634108 A JP S5634108A JP 10798079 A JP10798079 A JP 10798079A JP 10798079 A JP10798079 A JP 10798079A JP S5634108 A JPS5634108 A JP S5634108A
Authority
JP
Japan
Prior art keywords
magnetic
coil
recording
reproduction
film
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
Application number
JP10798079A
Other languages
Japanese (ja)
Other versions
JPS5827881B2 (en
Inventor
Masataka Ashikawa
Norio Inomata
Norio Yano
Ginya Ishiguro
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.)
Tokin Corp
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Tohoku Metal Industries 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=14472926&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JPS5634108(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Nippon Telegraph and Telephone Corp, Tohoku Metal Industries Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP54107980A priority Critical patent/JPS5827881B2/en
Publication of JPS5634108A publication Critical patent/JPS5634108A/en
Publication of JPS5827881B2 publication Critical patent/JPS5827881B2/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Digital Magnetic Recording (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

PURPOSE:To prevent the forgery and piracy, by making impossible the reproduction at normal means, through the provision of the means forming the protection film on the magnetic recording medium and saturating magnetically the protection film of the recording medium to the head in common use of recording and reproduction. CONSTITUTION:On the magnetic recording magnetic film 12 formed on the base 11, the protection film 13 by the ferromagnetism of small coercive force is formed. Further, the magnetism saturation coil 43 is provided to the head core 4 providing the recording coil 41 and the reproduction coil 42. At magnetic recording, the fine DC current in which the ferromagnetic film 13 is in magnetic saturation is fed to the magnetic saturation coil 43. At reproduction, no magnetic flux change is taken place to the gap of the head core 4, if the ferromagnetic film 13 is not in magnetic saturation state, and when fine DC current is fed to the magnetic saturation coil 43, the residual magnetism in the magnetic film 12 is appeared as the magnetic flux change to the reproduction coil 42 and the content of recording is picked up with greater output signal and can be reproduced.
JP54107980A 1979-08-24 1979-08-24 magnetic recording and reproducing device Expired JPS5827881B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54107980A JPS5827881B2 (en) 1979-08-24 1979-08-24 magnetic recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54107980A JPS5827881B2 (en) 1979-08-24 1979-08-24 magnetic recording and reproducing device

Publications (2)

Publication Number Publication Date
JPS5634108A true JPS5634108A (en) 1981-04-06
JPS5827881B2 JPS5827881B2 (en) 1983-06-13

Family

ID=14472926

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54107980A Expired JPS5827881B2 (en) 1979-08-24 1979-08-24 magnetic recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS5827881B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61115201A (en) * 1984-11-09 1986-06-02 Tomoegawa Paper Co Ltd Magnetic recording system
US5829722A (en) * 1995-08-21 1998-11-03 Nikko Kogyo Kabushiki Kaisha Electric component holder and mechanism of securing the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5593514A (en) * 1979-01-09 1980-07-16 Nippon Telegr & Teleph Corp <Ntt> Magnetic card recording and reproducing device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5593514A (en) * 1979-01-09 1980-07-16 Nippon Telegr & Teleph Corp <Ntt> Magnetic card recording and reproducing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61115201A (en) * 1984-11-09 1986-06-02 Tomoegawa Paper Co Ltd Magnetic recording system
US5829722A (en) * 1995-08-21 1998-11-03 Nikko Kogyo Kabushiki Kaisha Electric component holder and mechanism of securing the same

Also Published As

Publication number Publication date
JPS5827881B2 (en) 1983-06-13

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