JPS5584041A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS5584041A JPS5584041A JP15888578A JP15888578A JPS5584041A JP S5584041 A JPS5584041 A JP S5584041A JP 15888578 A JP15888578 A JP 15888578A JP 15888578 A JP15888578 A JP 15888578A JP S5584041 A JPS5584041 A JP S5584041A
- Authority
- JP
- Japan
- Prior art keywords
- keeping power
- recording medium
- recorded
- magnetic
- magnetic powder
- 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
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Abstract
PURPOSE: To obtain a magnetic recording medium excellent in the forgery prevention with which the true signals recorded could not be read unless the fixed operation given, by forming the magnetic layer via the mixture of the high and low magnetixm keeping power magnetic powder featuring double or more difference of the magnetism keeping power between.
CONSTITUTION: The binder and the mixture of the magnetic powder of the high magnetism keeping power (about 400 Oe or more) and the magnetic powder of the low magnetism keeping power (about 200 Oe or more) are compounded in the ratio of about 80:20W60:40. Such compound is then coated onto substrate 1 to form magnetic layer 2 and then to be used as the magnetic recording medium (Fig. a). The true signals are recorded on the magnetic recording medium mentioned above via the recording current of I2, and then the false signals are recorded via the recording current of I1. As a result, the true signals could not be read because of coexistence of the false signals (Fig. b). Thus the erasing current of I3 is applied to erase the false signals recorded on the low magnetism keeping power magnetic powder. As a result, the true signals recorded on the high magnetism keeping power magnetic powder can be read (Fig. c).
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15888578A JPS5584041A (en) | 1978-12-20 | 1978-12-20 | Magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15888578A JPS5584041A (en) | 1978-12-20 | 1978-12-20 | Magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5584041A true JPS5584041A (en) | 1980-06-24 |
Family
ID=15681504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15888578A Pending JPS5584041A (en) | 1978-12-20 | 1978-12-20 | Magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5584041A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4565726A (en) * | 1982-05-24 | 1986-01-21 | Tokyo Shibaura Denki Kabushiki Kaisha | Magnetic recording media having ferromagnetic and ferrite particles in the magnetic layer thereof |
JPS61145727A (en) * | 1984-12-19 | 1986-07-03 | Dainippon Printing Co Ltd | Cards having magnetic recording medium and its recording method |
JPS62204430A (en) * | 1986-03-03 | 1987-09-09 | Nippon Telegr & Teleph Corp <Ntt> | Magnetic card |
JPS63127423A (en) * | 1986-11-17 | 1988-05-31 | Hosokawa Katsupanshiyo:Kk | Magnetic recording medium |
JPS63308724A (en) * | 1987-06-09 | 1988-12-16 | Toppan Moore Co Ltd | Magnetic recording medium |
JPH0322214A (en) * | 1989-06-20 | 1991-01-30 | Tomoegawa Paper Co Ltd | Magnetic recording medium |
-
1978
- 1978-12-20 JP JP15888578A patent/JPS5584041A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4565726A (en) * | 1982-05-24 | 1986-01-21 | Tokyo Shibaura Denki Kabushiki Kaisha | Magnetic recording media having ferromagnetic and ferrite particles in the magnetic layer thereof |
JPS61145727A (en) * | 1984-12-19 | 1986-07-03 | Dainippon Printing Co Ltd | Cards having magnetic recording medium and its recording method |
JPH0533460B2 (en) * | 1984-12-19 | 1993-05-19 | Dainippon Printing Co Ltd | |
JPS62204430A (en) * | 1986-03-03 | 1987-09-09 | Nippon Telegr & Teleph Corp <Ntt> | Magnetic card |
JPS63127423A (en) * | 1986-11-17 | 1988-05-31 | Hosokawa Katsupanshiyo:Kk | Magnetic recording medium |
JPS63308724A (en) * | 1987-06-09 | 1988-12-16 | Toppan Moore Co Ltd | Magnetic recording medium |
JPH0322214A (en) * | 1989-06-20 | 1991-01-30 | Tomoegawa Paper Co Ltd | Magnetic recording medium |
JPH0551965B2 (en) * | 1989-06-20 | 1993-08-04 | Tomoegawa Paper Co Ltd |
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