JPS5362517A - Multipolar magnetism erasing head - Google Patents

Multipolar magnetism erasing head

Info

Publication number
JPS5362517A
JPS5362517A JP13688976A JP13688976A JPS5362517A JP S5362517 A JPS5362517 A JP S5362517A JP 13688976 A JP13688976 A JP 13688976A JP 13688976 A JP13688976 A JP 13688976A JP S5362517 A JPS5362517 A JP S5362517A
Authority
JP
Japan
Prior art keywords
multipolar
magnetism
erasing head
distorsion
erasing
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
JP13688976A
Other languages
Japanese (ja)
Other versions
JPS579124B2 (en
Inventor
Tatsuo Fujiwara
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
Toshiba Corp
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
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP13688976A priority Critical patent/JPS5362517A/en
Priority to GB3737477A priority patent/GB1575680A/en
Priority to US05/831,253 priority patent/US4146956A/en
Priority to DE19772740563 priority patent/DE2740563C2/en
Publication of JPS5362517A publication Critical patent/JPS5362517A/en
Publication of JPS579124B2 publication Critical patent/JPS579124B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)

Abstract

PURPOSE:To reduce noise, distorsion, etc., so as to contrive improvement of the erasing performance, by making small the decreasing rate of the magnetic pole distance in the region at one or plural spots of the magnet.
JP13688976A 1976-04-09 1976-11-16 Multipolar magnetism erasing head Granted JPS5362517A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP13688976A JPS5362517A (en) 1976-11-16 1976-11-16 Multipolar magnetism erasing head
GB3737477A 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
US05/831,253 US4146956A (en) 1976-04-09 1977-09-07 Method for manufacturing a multipolar erasing head
DE19772740563 DE2740563C2 (en) 1976-11-16 1977-09-08 Multipole permanent magnetic erase head as well as method and device for its magnetization

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13688976A JPS5362517A (en) 1976-11-16 1976-11-16 Multipolar magnetism erasing head

Publications (2)

Publication Number Publication Date
JPS5362517A true JPS5362517A (en) 1978-06-05
JPS579124B2 JPS579124B2 (en) 1982-02-19

Family

ID=15185910

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13688976A Granted JPS5362517A (en) 1976-04-09 1976-11-16 Multipolar magnetism erasing head

Country Status (1)

Country Link
JP (1) JPS5362517A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57138002A (en) * 1981-02-19 1982-08-26 Matsushita Electric Ind Co Ltd Permanent magnet erasing head
JPS58146005A (en) * 1982-02-24 1983-08-31 Matsushita Electric Ind Co Ltd Magnet erase head device
JPS62256211A (en) * 1986-04-26 1987-11-07 Yoshinori Kitamura Erasing head for tape recorder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57138002A (en) * 1981-02-19 1982-08-26 Matsushita Electric Ind Co Ltd Permanent magnet erasing head
JPS6313250B2 (en) * 1981-02-19 1988-03-24 Matsushita Electric Ind Co Ltd
JPS58146005A (en) * 1982-02-24 1983-08-31 Matsushita Electric Ind Co Ltd Magnet erase head device
JPS62256211A (en) * 1986-04-26 1987-11-07 Yoshinori Kitamura Erasing head for tape recorder
JPH0461405B2 (en) * 1986-04-26 1992-09-30 Yoshinori Kitamura

Also Published As

Publication number Publication date
JPS579124B2 (en) 1982-02-19

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