JPS5782208A - Permanent magnet erasing head - Google Patents
Permanent magnet erasing headInfo
- Publication number
- JPS5782208A JPS5782208A JP15918380A JP15918380A JPS5782208A JP S5782208 A JPS5782208 A JP S5782208A JP 15918380 A JP15918380 A JP 15918380A JP 15918380 A JP15918380 A JP 15918380A JP S5782208 A JPS5782208 A JP S5782208A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- magnetic field
- nonmagnetic substance
- permanent magnet
- magnetic
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/325—Erasing heads using permanent magnets
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Abstract
PURPOSE:To mitigate the inverse magnetization to adjacent magnetic plates and the demagnetization due to leaked magnetic field, even if two opposed magnet poles cause position shift, by alternately laminating a permanent magnet plate with different magnetic characterstics and a nonmagnetic substance. CONSTITUTION:Magnet plates 6-11 having different magnetic characteristics and a nonmagnetic substance 12 are combined alternately and laminated. As magnet plate forming an inverted gradually reduced magnetic field, strontium ferrite magnet powder is mixed in ethylenevinyl acetate copolymer, it is formed in a magnetic field and demagnetized, and as the nonmagnetic substance 12, brass plate is used.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15918380A JPS5782208A (en) | 1980-11-12 | 1980-11-12 | Permanent magnet erasing head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15918380A JPS5782208A (en) | 1980-11-12 | 1980-11-12 | Permanent magnet erasing head |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5782208A true JPS5782208A (en) | 1982-05-22 |
Family
ID=15688117
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15918380A Pending JPS5782208A (en) | 1980-11-12 | 1980-11-12 | Permanent magnet erasing head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5782208A (en) |
-
1980
- 1980-11-12 JP JP15918380A patent/JPS5782208A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
NL185272B (en) | MAGNETIC CLAMPING PLATE WITH PERMANENT AND ELECTROPERMANENT MAGNETS. | |
IE810288L (en) | Magnetisation of materials | |
GB1197779A (en) | Improved Magnetizer and Demagnetizer. | |
ES419858A1 (en) | Shield for permanent magnet structure | |
GB783032A (en) | Improvements in or relating to ferromagnetic core arrangements | |
GB1325344A (en) | Magnet actuating arrangements for magneto sensitive devices | |
JPS5782208A (en) | Permanent magnet erasing head | |
ES416435A1 (en) | Stacked magnetic arrangement | |
JPS57165761A (en) | Transducer for electro-magnetic ultrasonic wave | |
JPS5325410A (en) | Magnetic head | |
JPS5613705A (en) | Magnetic circuit using anisotropic magnet | |
SE7711078L (en) | PERMANENT MAGNETIC ADHESIVE PLATE | |
JPS5776805A (en) | Polarized solenoid | |
SU424241A1 (en) | DEVICE FOR REVERSIBLE MAGNETIZATION OF MAGNETS FROM A MAGNETIC MATERIAL | |
JPS55120109A (en) | Magnetic tape for attraction | |
JPS57113401A (en) | Permanent magnet erasing head | |
GB923537A (en) | Improvements in and relating to permanent magnets | |
JPS5782207A (en) | Permanent magnet erasing head | |
JPS53100415A (en) | Rotor having a permanent magnet | |
JPS5411411A (en) | Magnetic circuit | |
JPS5555504A (en) | Method of magnetizing permanent magnet | |
JPS578905A (en) | Permanent magnet erasing head | |
JPS57138002A (en) | Permanent magnet erasing head | |
JPS56161618A (en) | Magnetizing device | |
GB1336481A (en) | Method of magnetizing a permanent magnet assembly and a per manent magnet assembly when prepared by the method |