JPS55153104A - Method and device for demagnetizing magnetic tape - Google Patents

Method and device for demagnetizing magnetic tape

Info

Publication number
JPS55153104A
JPS55153104A JP6179279A JP6179279A JPS55153104A JP S55153104 A JPS55153104 A JP S55153104A JP 6179279 A JP6179279 A JP 6179279A JP 6179279 A JP6179279 A JP 6179279A JP S55153104 A JPS55153104 A JP S55153104A
Authority
JP
Japan
Prior art keywords
magnetic
tape
magnetic field
magnetic poles
gradually
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
JP6179279A
Other languages
Japanese (ja)
Inventor
Isamu Nakao
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.)
SANSHIN DENKI KK
Original Assignee
SANSHIN DENKI KK
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 SANSHIN DENKI KK filed Critical SANSHIN DENKI KK
Priority to JP6179279A priority Critical patent/JPS55153104A/en
Publication of JPS55153104A publication Critical patent/JPS55153104A/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
    • G11B5/0245—Bulk erasing

Abstract

PURPOSE:To demagnetize a wound tape gradually and evenly as it is, by arranging upper and lower magnetic poles for magnetic field generation and by providing a magnetic field crossing a tape winding direction. CONSTITUTION:Magnetic poles 12a and 12b are arranged opposite to each other with tape mount plate 11 vertically sandwiched in between and while exciting coils 12 are wound around those magnetic poles, magnetic poles are fitted to yoke 13. Here, the winding center of magnetic tape 14 should agree with the center of magnetic tape 14 should agree with the center of magnetic poles 12a and 12b. Then, a push-button switch is turned ON to feed electric power to magnetic-field generator 16 and a magnetic field is generated between magnetic poles 12a and 12b and performs demagnetization by destroying record on a magnetized tape. In this magnetic field generation, a saturated magnetic field is provided for several seconds firstly by a gradually-decreasing AC current obtained by controller 18 and gradually damped next and the tape is left for several seconds without any magnetic field. Consequently, perfect demagnetization comes into effect.
JP6179279A 1979-05-18 1979-05-18 Method and device for demagnetizing magnetic tape Pending JPS55153104A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6179279A JPS55153104A (en) 1979-05-18 1979-05-18 Method and device for demagnetizing magnetic tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6179279A JPS55153104A (en) 1979-05-18 1979-05-18 Method and device for demagnetizing magnetic tape

Publications (1)

Publication Number Publication Date
JPS55153104A true JPS55153104A (en) 1980-11-28

Family

ID=13181295

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6179279A Pending JPS55153104A (en) 1979-05-18 1979-05-18 Method and device for demagnetizing magnetic tape

Country Status (1)

Country Link
JP (1) JPS55153104A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116484788A (en) * 2023-04-26 2023-07-25 北京航空航天大学 Modeling method and system for demagnetizing process of magnetic shielding device
US11969669B2 (en) 2009-12-22 2024-04-30 Cytiva Sweden Ab Containers for chromatography media

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11969669B2 (en) 2009-12-22 2024-04-30 Cytiva Sweden Ab Containers for chromatography media
CN116484788A (en) * 2023-04-26 2023-07-25 北京航空航天大学 Modeling method and system for demagnetizing process of magnetic shielding device
CN116484788B (en) * 2023-04-26 2023-11-14 北京航空航天大学 Modeling method and system for demagnetizing process of magnetic shielding device

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