JPS5782208A - Permanent magnet erasing head - Google Patents

Permanent magnet erasing head

Info

Publication number
JPS5782208A
JPS5782208A JP15918380A JP15918380A JPS5782208A JP S5782208 A JPS5782208 A JP S5782208A JP 15918380 A JP15918380 A JP 15918380A JP 15918380 A JP15918380 A JP 15918380A JP S5782208 A JPS5782208 A JP S5782208A
Authority
JP
Japan
Prior art keywords
magnet
magnetic field
nonmagnetic substance
permanent magnet
magnetic
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.)
Pending
Application number
JP15918380A
Other languages
Japanese (ja)
Inventor
Norio Miyatake
Keizo Ishiwatari
Noboru Koizumi
Nobuo Kashimura
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP15918380A priority Critical patent/JPS5782208A/en
Publication of JPS5782208A publication Critical patent/JPS5782208A/en
Pending 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

Landscapes

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

Abstract

PURPOSE:To mitigate the inverse magnetization to adjacent magnetic plates and the demagnetization due to leaked magnetic field, even if two opposed magnet poles cause position shift, by alternately laminating a permanent magnet plate with different magnetic characterstics and a nonmagnetic substance. CONSTITUTION:Magnet plates 6-11 having different magnetic characteristics and a nonmagnetic substance 12 are combined alternately and laminated. As magnet plate forming an inverted gradually reduced magnetic field, strontium ferrite magnet powder is mixed in ethylenevinyl acetate copolymer, it is formed in a magnetic field and demagnetized, and as the nonmagnetic substance 12, brass plate is used.
JP15918380A 1980-11-12 1980-11-12 Permanent magnet erasing head Pending JPS5782208A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15918380A JPS5782208A (en) 1980-11-12 1980-11-12 Permanent magnet erasing head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15918380A JPS5782208A (en) 1980-11-12 1980-11-12 Permanent magnet erasing head

Publications (1)

Publication Number Publication Date
JPS5782208A true JPS5782208A (en) 1982-05-22

Family

ID=15688117

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15918380A Pending JPS5782208A (en) 1980-11-12 1980-11-12 Permanent magnet erasing head

Country Status (1)

Country Link
JP (1) JPS5782208A (en)

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