JPS5517878A - Erasing magnetic head - Google Patents

Erasing magnetic head

Info

Publication number
JPS5517878A
JPS5517878A JP9098778A JP9098778A JPS5517878A JP S5517878 A JPS5517878 A JP S5517878A JP 9098778 A JP9098778 A JP 9098778A JP 9098778 A JP9098778 A JP 9098778A JP S5517878 A JPS5517878 A JP S5517878A
Authority
JP
Japan
Prior art keywords
point
moved
magnetic
gap
erasing
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
JP9098778A
Other languages
Japanese (ja)
Inventor
Teruhiko Oshima
Masaru Takayama
Masao Shigeta
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.)
TDK Corp
Original Assignee
TDK Corp
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 TDK Corp filed Critical TDK Corp
Priority to JP9098778A priority Critical patent/JPS5517878A/en
Publication of JPS5517878A publication Critical patent/JPS5517878A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To erase a large-coercive force magnetic recording medium with a low nozzle level by erasing first the magnetic recording medium magnetically in DC and shifting next the residual magnetic flux to a value near O and making finally the residual magnetic flux of O by AC magnetic erasing.
CONSTITUTION: First head 10 in box body 30 has permanent magnet 11 and yokes 12 and 13 which have one ends connected to the S pole and the other ends made opposite to the N pole through spacers 12a and 13a. Second head 20 to apply an AC magnetic field has center core 25, where coil 21 is wound, and yokes 26 and 27 which are opposite to center core 25 through gaps 22 and 23. When magnetic tape 1 is moved in the T direction, the recording magnetic field which is in the state of point 1 first in a hysteresis loop is moved and saturated at point 2 in gap 13a and is moved to point 3 after passing through gap 13a. Further, DC magnetic filed H slightly larger than coercive force Hc of tape 1 is applied in gap 12a, and point 3 is moved to point 4 and is moved to point 5 after passing through gap 12a, and residual magnetic flux density R at point 5 is erased magnetically in AC.
COPYRIGHT: (C)1980,JPO&Japio
JP9098778A 1978-07-27 1978-07-27 Erasing magnetic head Pending JPS5517878A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9098778A JPS5517878A (en) 1978-07-27 1978-07-27 Erasing magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9098778A JPS5517878A (en) 1978-07-27 1978-07-27 Erasing magnetic head

Publications (1)

Publication Number Publication Date
JPS5517878A true JPS5517878A (en) 1980-02-07

Family

ID=14013854

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9098778A Pending JPS5517878A (en) 1978-07-27 1978-07-27 Erasing magnetic head

Country Status (1)

Country Link
JP (1) JPS5517878A (en)

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