JPS5658110A - Direct current erasing device - Google Patents
Direct current erasing deviceInfo
- 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
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.
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)
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 |
-
1979
- 1979-10-16 JP JP13344179A patent/JPS5658110A/en active Pending
Cited By (1)
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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