JPS5456403A - Production of high recording density magnetic discs - Google Patents
Production of high recording density magnetic discsInfo
- Publication number
- JPS5456403A JPS5456403A JP12238177A JP12238177A JPS5456403A JP S5456403 A JPS5456403 A JP S5456403A JP 12238177 A JP12238177 A JP 12238177A JP 12238177 A JP12238177 A JP 12238177A JP S5456403 A JPS5456403 A JP S5456403A
- Authority
- JP
- Japan
- Prior art keywords
- plating layers
- magnetic
- thickness
- recording density
- underlying
- 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
Landscapes
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Thin Magnetic Films (AREA)
Abstract
PURPOSE: To provide low noise, high output and high resolution by forming intermediate plating layers of non-magnetic Ni-Sn alloy prior to performing magnetic plating on polished underlying plating layers thereby oroducing the high recording density magnetic disc.
CONSTITUTION: Therating films 2 of about 0.5μ in thickness by zinc immersion treatment, copper strike plating layers 3 of about 4μ in thickness and underlying plating layers 4 composed of copper-tin alloy are laminated on a magnetic disc blank 1 which is made of corrosion-resistant aluminum and has flat surfaces. After the disc blank is heat treated for about 1 hour at about 320°C, the srufaces of the underlying plating layers 4 are smoothed by mechanical polishing. Next, intermediate plating layers 5 by Ni-Sn alloy of about 0.1μ in thickness at pH 2.2 to 2.5 are formed by using the plating bath of the composition comprising NH4F.HF: 35 (g/l, hereinafter the same), NaF; 28, SnCl22H2O;50, NiC12.6H2O; 300, after which magnetic plating layers 6 and protecting films 7 are laminated thereon
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12238177A JPS6057131B2 (en) | 1977-10-14 | 1977-10-14 | Manufacturing method for high recording density magnetic disks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12238177A JPS6057131B2 (en) | 1977-10-14 | 1977-10-14 | Manufacturing method for high recording density magnetic disks |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5456403A true JPS5456403A (en) | 1979-05-07 |
JPS6057131B2 JPS6057131B2 (en) | 1985-12-13 |
Family
ID=14834405
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12238177A Expired JPS6057131B2 (en) | 1977-10-14 | 1977-10-14 | Manufacturing method for high recording density magnetic disks |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6057131B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0103673A2 (en) * | 1982-08-25 | 1984-03-28 | ANT Nachrichtentechnik GmbH | Integrated microoptic apparatus |
JP2009097249A (en) * | 2007-10-17 | 2009-05-07 | Yasuhiro Matsuzaki | Method of forming inspection opening in continuous footing and opening reinforcing unit |
-
1977
- 1977-10-14 JP JP12238177A patent/JPS6057131B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0103673A2 (en) * | 1982-08-25 | 1984-03-28 | ANT Nachrichtentechnik GmbH | Integrated microoptic apparatus |
EP0103673B1 (en) * | 1982-08-25 | 1989-02-01 | ANT Nachrichtentechnik GmbH | Integrated microoptic apparatus |
JP2009097249A (en) * | 2007-10-17 | 2009-05-07 | Yasuhiro Matsuzaki | Method of forming inspection opening in continuous footing and opening reinforcing unit |
Also Published As
Publication number | Publication date |
---|---|
JPS6057131B2 (en) | 1985-12-13 |
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