JPS5532284A - Multi-channel erasing head unit - Google Patents

Multi-channel erasing head unit

Info

Publication number
JPS5532284A
JPS5532284A JP10528178A JP10528178A JPS5532284A JP S5532284 A JPS5532284 A JP S5532284A JP 10528178 A JP10528178 A JP 10528178A JP 10528178 A JP10528178 A JP 10528178A JP S5532284 A JPS5532284 A JP S5532284A
Authority
JP
Japan
Prior art keywords
magnetic
temperature
spacers
magnetism
spacer
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
JP10528178A
Other languages
Japanese (ja)
Inventor
Takashi Tanaka
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 JP10528178A priority Critical patent/JPS5532284A/en
Publication of JPS5532284A publication Critical patent/JPS5532284A/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
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/49—Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4969—Details for track selection or addressing

Abstract

PURPOSE:To ensure the erase lof specific track without giving effect to other tracks, by providing the magnetic substance in which magnetism-non-magnetism change is made by temperature, at the magnetic gap of each head element, and changing the temperature simultaneously or selectively. CONSTITUTION:The spacers 4, 4' made of magnetic material are placed at the gap of tip of the magnetic cores 1, 1' of the first and second channel, and the heaters 5, 5' are placed near the gap. The Curie temperature of the said spacers 4, 4' is set to a little higher value than the usage temperature. In normal state, the spacers 4, 4' are ferro-magnetic substance and even if magnetic flux passes through the cores 1, 1', it is shut at the spacers 4, 4' and not leaked out. But when the heater 5' is heated, the temperature is in excess of the Curie point at the spacer 4' into non-magnetism, and when current flows into the winding 3', leakage is caused at the spacer 4' to erase the second track. In this case, a part of magnetid flux is leaked to the first channel, but the magnetic flux is shunted due to ferro-magnetism of the spacer 4 to inhibit leakage and the signal on the first track is not erased.
JP10528178A 1978-08-28 1978-08-28 Multi-channel erasing head unit Pending JPS5532284A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10528178A JPS5532284A (en) 1978-08-28 1978-08-28 Multi-channel erasing head unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10528178A JPS5532284A (en) 1978-08-28 1978-08-28 Multi-channel erasing head unit

Publications (1)

Publication Number Publication Date
JPS5532284A true JPS5532284A (en) 1980-03-06

Family

ID=14403283

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10528178A Pending JPS5532284A (en) 1978-08-28 1978-08-28 Multi-channel erasing head unit

Country Status (1)

Country Link
JP (1) JPS5532284A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011054568A1 (en) * 2009-11-03 2011-05-12 International Business Machines Corporation Magnetic writer having multiple gaps with more uniform magnetic fields across the gaps

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011054568A1 (en) * 2009-11-03 2011-05-12 International Business Machines Corporation Magnetic writer having multiple gaps with more uniform magnetic fields across the gaps
US8385018B2 (en) 2009-11-03 2013-02-26 International Business Machines Corporation Magnetic writer having multiple gaps with more uniform magnetic fields across the gaps
US8670210B2 (en) 2009-11-03 2014-03-11 International Business Machines Corporation Magnetic writer having multiple gaps with more uniform magnetic fields across the gaps
US9257137B2 (en) 2009-11-03 2016-02-09 International Business Machines Corporation Magnetic writer having multiple gaps with more uniform magnetic fields across the gaps
US9601134B2 (en) 2009-11-03 2017-03-21 International Business Machines Corporation Magnetic writer having multiple gaps with more uniform magnetic fields across the gaps

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