JPS5774808A - Demagnetizing method of magnetic tape - Google Patents

Demagnetizing method of magnetic tape

Info

Publication number
JPS5774808A
JPS5774808A JP14931180A JP14931180A JPS5774808A JP S5774808 A JPS5774808 A JP S5774808A JP 14931180 A JP14931180 A JP 14931180A JP 14931180 A JP14931180 A JP 14931180A JP S5774808 A JPS5774808 A JP S5774808A
Authority
JP
Japan
Prior art keywords
reel
prescribed
magnetic tape
coils
tape
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
JP14931180A
Other languages
Japanese (ja)
Other versions
JPH039535B2 (en
Inventor
Hidehiro Inoue
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.)
Denshijiki Industry Co Ltd
Original Assignee
Denshijiki Industry 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 Denshijiki Industry Co Ltd filed Critical Denshijiki Industry Co Ltd
Priority to JP14931180A priority Critical patent/JPS5774808A/en
Publication of JPS5774808A publication Critical patent/JPS5774808A/en
Publication of JPH039535B2 publication Critical patent/JPH039535B2/ja
Granted 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
    • G11B5/0245—Bulk erasing

Landscapes

  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To execute demagnetization without heating a metallic reel, by rotating a magnetic tape wound to a reel at a prescribed rotation speed, and applying a prescribed damping oscillation magnetic field to the tape, when demagnetizing a magnetic tape provided with a metallic reel. CONSTITUTION:Coils 11, 12 of a demagnetizing device 10 are placed so that they are opposed and also their axial directions coincide with each other. A turntable 13 is placed horizontally and in parallel with the axial direction between the coils 11, 12, and is driven 15. A magnetic tape 21 wound to a metallic reel 20 is placed and fixed on the table 13, and after that, the table 13 is rotated at a high speed by a prescribed rotation speed for instance, clockwise C. In this state, an orientation processing direction B-B' of the tap 21 becomes parallel with the axial direction. Subsequently, a prescribed energizing current, for instance, a damping alternating current having 40musec period and <=1sec damping time is applied to the coils 11, 12, and a magnetic field H whose maximum value is almost 2,000 Oe or so is generated, and the tape 21 is demagnetized. In this case, side surfaces 20a, 20b of the reel 20 become the direction of the magnetic field H, and is not heated.
JP14931180A 1980-10-27 1980-10-27 Demagnetizing method of magnetic tape Granted JPS5774808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14931180A JPS5774808A (en) 1980-10-27 1980-10-27 Demagnetizing method of magnetic tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14931180A JPS5774808A (en) 1980-10-27 1980-10-27 Demagnetizing method of magnetic tape

Publications (2)

Publication Number Publication Date
JPS5774808A true JPS5774808A (en) 1982-05-11
JPH039535B2 JPH039535B2 (en) 1991-02-08

Family

ID=15472345

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14931180A Granted JPS5774808A (en) 1980-10-27 1980-10-27 Demagnetizing method of magnetic tape

Country Status (1)

Country Link
JP (1) JPS5774808A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61170904A (en) * 1985-01-23 1986-08-01 Arutetsuku Kk Magnetic erasing device for magnetic tape
JPH02132604A (en) * 1988-11-14 1990-05-22 Sanitsukusu Kk Magnetic tape erasing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5580806A (en) * 1978-12-11 1980-06-18 Sanshin Denki Kk Method and device for demagnetization of magnetic tape

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5580806A (en) * 1978-12-11 1980-06-18 Sanshin Denki Kk Method and device for demagnetization of magnetic tape

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61170904A (en) * 1985-01-23 1986-08-01 Arutetsuku Kk Magnetic erasing device for magnetic tape
JPH02132604A (en) * 1988-11-14 1990-05-22 Sanitsukusu Kk Magnetic tape erasing device

Also Published As

Publication number Publication date
JPH039535B2 (en) 1991-02-08

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