JPS5517878A - Erasing magnetic head - Google Patents
Erasing magnetic headInfo
- 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
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
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) |
-
1978
- 1978-07-27 JP JP9098778A patent/JPS5517878A/en active Pending
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