JPS5658110A - Direct current erasing device - Google Patents

Direct current erasing device

Info

Publication number
JPS5658110A
JPS5658110A JP13344179A JP13344179A JPS5658110A JP S5658110 A JPS5658110 A JP S5658110A JP 13344179 A JP13344179 A JP 13344179A JP 13344179 A JP13344179 A JP 13344179A JP S5658110 A JPS5658110 A JP S5658110A
Authority
JP
Japan
Prior art keywords
tape
head
magnetic field
magnetic
magnetization
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
JP13344179A
Other languages
Japanese (ja)
Inventor
Kenji Kimura
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP13344179A priority Critical patent/JPS5658110A/en
Publication of JPS5658110A publication Critical patent/JPS5658110A/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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/024—Erasing

Landscapes

  • Recording Or Reproducing By Magnetic Means (AREA)
  • Magnetic Heads (AREA)

Abstract

PURPOSE:To eliminate completely the residual DC magnetic field on the magnetic tape, by installing an electromagnetic device which generates the magnetic field having the opposite polarity to cancel the residual magnetic field. CONSTITUTION:Both the recording/reproducing head 4 and the erasing head 5 slide onto the tape surface with travelling of the magnetic tape 1. At the same time, the electromagnet 6 and the Hall device 7 are allowed to contact slidably onto the tape surface interlocking to the head 5. When the tape 1 travels in touch with the head 5, a DC erasion is given to the contents of the tape recorded previously. At the same time, the tape is magnetized to the N pole. After this, the magnetized area of the tape touches in running the device 7, and thus the output voltage according to the magnetization of the tape at that moment is produced. And the difference between the output voltage and that in the nonmagnetic field state of the Hall device 10 is applied to the magnet 6 via the operational amplifier 12 and the amplifier 14. As a result, the magnetization is cancelled for the N pole of the tape.
JP13344179A 1979-10-16 1979-10-16 Direct current erasing device Pending JPS5658110A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13344179A JPS5658110A (en) 1979-10-16 1979-10-16 Direct current erasing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13344179A JPS5658110A (en) 1979-10-16 1979-10-16 Direct current erasing device

Publications (1)

Publication Number Publication Date
JPS5658110A true JPS5658110A (en) 1981-05-21

Family

ID=15104838

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13344179A Pending JPS5658110A (en) 1979-10-16 1979-10-16 Direct current erasing device

Country Status (1)

Country Link
JP (1) JPS5658110A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7922480B2 (en) 2002-12-12 2011-04-12 Babcock-Hitachi Kabushiki Kaisha Combustion apparatus and wind box

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7922480B2 (en) 2002-12-12 2011-04-12 Babcock-Hitachi Kabushiki Kaisha Combustion apparatus and wind box

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