JPS5658130A - Magnetic card having increased resistance to external magnetic field - Google Patents
Magnetic card having increased resistance to external magnetic fieldInfo
- Publication number
- JPS5658130A JPS5658130A JP13461879A JP13461879A JPS5658130A JP S5658130 A JPS5658130 A JP S5658130A JP 13461879 A JP13461879 A JP 13461879A JP 13461879 A JP13461879 A JP 13461879A JP S5658130 A JPS5658130 A JP S5658130A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- magnetic
- record
- powder
- increased resistance
- 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.)
- Granted
Links
Abstract
PURPOSE: To avoid the erasion of the record caused by the external magnetic field, by compounding the normal magnetic powder having a high antimagnetic force and the magnetic powder having a higher coerasive force to obtain a magnetic record layer.
CONSTITUTION: At present the ferrite impalpable powder having the HC of 2,000W 3,000 Oe is used for the magnetic powder of a high antimagnetic force, and the magnetic powder having the HC higher than the above magnetic powder by 10W15% (25W40% preferably) is compounded to the above magnetic powder. In this case, the magnetic powder has the HC of 3,000W6,000 Oe. For instance, a sufficient saturation writing is impossible in the normal way to the magnetic powder having the HC of 5,000 Oe, but a partial writing is possible. Accordingly, the record written to the magnetic powder of the HC of about 2,000 Oe is erased, but the record remaining in the magnetic powder of the HC of 5,000 Oe can be read in a correct way.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13461879A JPS5658130A (en) | 1979-10-18 | 1979-10-18 | Magnetic card having increased resistance to external magnetic field |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13461879A JPS5658130A (en) | 1979-10-18 | 1979-10-18 | Magnetic card having increased resistance to external magnetic field |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5658130A true JPS5658130A (en) | 1981-05-21 |
JPH0210484B2 JPH0210484B2 (en) | 1990-03-08 |
Family
ID=15132592
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13461879A Granted JPS5658130A (en) | 1979-10-18 | 1979-10-18 | Magnetic card having increased resistance to external magnetic field |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5658130A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62153613U (en) * | 1986-03-19 | 1987-09-29 | ||
JPS63127423A (en) * | 1986-11-17 | 1988-05-31 | Hosokawa Katsupanshiyo:Kk | Magnetic recording medium |
JPH03256218A (en) * | 1990-03-07 | 1991-11-14 | Toshiba Glass Co Ltd | Magnetic card |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4824244U (en) * | 1971-07-28 | 1973-03-20 | ||
JPS4912161A (en) * | 1972-05-19 | 1974-02-02 | ||
JPS5085306A (en) * | 1973-10-31 | 1975-07-09 | ||
JPS50132905A (en) * | 1974-04-05 | 1975-10-21 | ||
JPS5222247U (en) * | 1975-08-05 | 1977-02-17 |
-
1979
- 1979-10-18 JP JP13461879A patent/JPS5658130A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4824244U (en) * | 1971-07-28 | 1973-03-20 | ||
JPS4912161A (en) * | 1972-05-19 | 1974-02-02 | ||
JPS5085306A (en) * | 1973-10-31 | 1975-07-09 | ||
JPS50132905A (en) * | 1974-04-05 | 1975-10-21 | ||
JPS5222247U (en) * | 1975-08-05 | 1977-02-17 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62153613U (en) * | 1986-03-19 | 1987-09-29 | ||
JPH0411215Y2 (en) * | 1986-03-19 | 1992-03-19 | ||
JPS63127423A (en) * | 1986-11-17 | 1988-05-31 | Hosokawa Katsupanshiyo:Kk | Magnetic recording medium |
JPH03256218A (en) * | 1990-03-07 | 1991-11-14 | Toshiba Glass Co Ltd | Magnetic card |
Also Published As
Publication number | Publication date |
---|---|
JPH0210484B2 (en) | 1990-03-08 |
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