GB1575680A - Tape recording apparatus including a multipolar erasing head and a manufacturing method for a multipolar erasing head - Google Patents

Tape recording apparatus including a multipolar erasing head and a manufacturing method for a multipolar erasing head Download PDF

Info

Publication number
GB1575680A
GB1575680A GB3737477A GB3737477A GB1575680A GB 1575680 A GB1575680 A GB 1575680A GB 3737477 A GB3737477 A GB 3737477A GB 3737477 A GB3737477 A GB 3737477A GB 1575680 A GB1575680 A GB 1575680A
Authority
GB
United Kingdom
Prior art keywords
magnetic
erasing head
erasing
tape
poles
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
GB3737477A
Other languages
English (en)
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.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co 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
Priority claimed from JP13688876A external-priority patent/JPS5362516A/ja
Priority claimed from JP13688976A external-priority patent/JPS5362517A/ja
Priority claimed from JP145377A external-priority patent/JPS5388195A/ja
Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Publication of GB1575680A publication Critical patent/GB1575680A/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
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/325—Erasing heads using permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)
GB3737477A 1976-11-16 1977-09-07 Tape recording apparatus including a multipolar erasing head and a manufacturing method for a multipolar erasing head Expired GB1575680A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP13688876A JPS5362516A (en) 1976-11-16 1976-11-16 Multipolar magnetism erasing head and its manufacture
JP13688976A JPS5362517A (en) 1976-11-16 1976-11-16 Multipolar magnetism erasing head
JP145377A JPS5388195A (en) 1977-01-12 1977-01-12 Magnetizing device of multi-pole magnet eraser head

Publications (1)

Publication Number Publication Date
GB1575680A true GB1575680A (en) 1980-09-24

Family

ID=27274927

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3737477A Expired GB1575680A (en) 1976-11-16 1977-09-07 Tape recording apparatus including a multipolar erasing head and a manufacturing method for a multipolar erasing head

Country Status (2)

Country Link
DE (1) DE2740563C2 (de)
GB (1) GB1575680A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081855A2 (de) * 1981-12-15 1983-06-22 Matsushita Electric Industrial Co., Ltd. Löschmagnetkopf
US4648004A (en) * 1984-10-26 1987-03-03 Siemens Aktiengesellschaft Methods for detecting a magnetic preorientation in mechanical parts and for magnetizing the parts utilizing such detection method, and an associated device for magnetizing the parts in accordance with these methods
GB2195198A (en) * 1986-09-17 1988-03-30 Racal Recorders Ltd Erasing head
EP0271098A2 (de) * 1986-12-10 1988-06-15 Matsushita Electric Industrial Co., Ltd. Entmagnetisierungskopf der Art mit Permanentmagnet

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4499444A (en) * 1983-05-20 1985-02-12 Minnesota Mining And Manufacturing Company Desensitizer for ferromagnetic markers used with electromagnetic article surveillance systems

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL78443C (de) * 1950-01-20
DE1178147B (de) * 1960-03-25 1964-09-17 Smith & Sons Ltd S Verfahren und Einrichtung zum Magnetisieren flacher, zylindrischer Dauermagnetkoerper mit einer Vielzahl von auf dem Umfang liegenden Polen
JPS549044B1 (de) * 1970-05-21 1979-04-20

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081855A2 (de) * 1981-12-15 1983-06-22 Matsushita Electric Industrial Co., Ltd. Löschmagnetkopf
EP0081855A3 (en) * 1981-12-15 1985-11-06 Matsushita Electric Industrial Co., Ltd. Magnetic erasing head
US4648004A (en) * 1984-10-26 1987-03-03 Siemens Aktiengesellschaft Methods for detecting a magnetic preorientation in mechanical parts and for magnetizing the parts utilizing such detection method, and an associated device for magnetizing the parts in accordance with these methods
GB2195198A (en) * 1986-09-17 1988-03-30 Racal Recorders Ltd Erasing head
EP0271098A2 (de) * 1986-12-10 1988-06-15 Matsushita Electric Industrial Co., Ltd. Entmagnetisierungskopf der Art mit Permanentmagnet
EP0271098A3 (de) * 1986-12-10 1990-05-16 Matsushita Electric Industrial Co., Ltd. Entmagnetisierungskopf der Art mit Permanentmagnet

Also Published As

Publication number Publication date
DE2740563A1 (de) 1978-05-18
DE2740563C2 (de) 1981-11-19

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19970906