JPS5473006A - Production of magnetic disc - Google Patents
Production of magnetic discInfo
- Publication number
- JPS5473006A JPS5473006A JP13981877A JP13981877A JPS5473006A JP S5473006 A JPS5473006 A JP S5473006A JP 13981877 A JP13981877 A JP 13981877A JP 13981877 A JP13981877 A JP 13981877A JP S5473006 A JPS5473006 A JP S5473006A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic disc
- coating film
- magnetic
- precision
- nitric acid
- 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
- Chemical Treatment Of Metals (AREA)
- Magnetic Record Carriers (AREA)
- Thin Magnetic Films (AREA)
Abstract
PURPOSE: To produce a magnetic disc which is free from peeling of coating film and has no variations in recording and reproducing signals by dipping a precision- finished aluminum substrate in a heated concentrated nitric acid solution to provide an even and moderate roughness on the surface then forming a magnetic coating film.
CONSTITUTION: A precision-finished aluminum substrate is dipped for about 10 to 60 seconds in concentrated nitric acid of about 30 to 80°C in temperature and more than about 98% in concentration to make the mean surface roughness thereof about 0.01 to 0.02μmRa (values measured with Talystep meter), after which a magnetic coating film is coated to an even thickness, whereby the magnetic disc is provided.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13981877A JPS5473006A (en) | 1977-11-24 | 1977-11-24 | Production of magnetic disc |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13981877A JPS5473006A (en) | 1977-11-24 | 1977-11-24 | Production of magnetic disc |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5473006A true JPS5473006A (en) | 1979-06-12 |
Family
ID=15254164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13981877A Pending JPS5473006A (en) | 1977-11-24 | 1977-11-24 | Production of magnetic disc |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5473006A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59180832A (en) * | 1983-03-31 | 1984-10-15 | Nippon Light Metal Co Ltd | Alumite substrate for magnetic recording material |
JPS6361409A (en) * | 1986-09-01 | 1988-03-17 | Hitachi Ltd | Magnetic recording medium |
-
1977
- 1977-11-24 JP JP13981877A patent/JPS5473006A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59180832A (en) * | 1983-03-31 | 1984-10-15 | Nippon Light Metal Co Ltd | Alumite substrate for magnetic recording material |
JPH0448859B2 (en) * | 1983-03-31 | 1992-08-07 | Nippon Light Metal Co | |
JPS6361409A (en) * | 1986-09-01 | 1988-03-17 | Hitachi Ltd | Magnetic recording medium |
JPH0833983B2 (en) * | 1986-09-01 | 1996-03-29 | 株式会社日立製作所 | Magnetic recording media |
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