JPS57210997A - Production of magnetic disc substrate - Google Patents
Production of magnetic disc substrateInfo
- Publication number
- JPS57210997A JPS57210997A JP9391181A JP9391181A JPS57210997A JP S57210997 A JPS57210997 A JP S57210997A JP 9391181 A JP9391181 A JP 9391181A JP 9391181 A JP9391181 A JP 9391181A JP S57210997 A JPS57210997 A JP S57210997A
- Authority
- JP
- Japan
- Prior art keywords
- disc substrate
- substrate
- arabitol
- dents
- magnetic disc
- 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
- Manufacturing Of Magnetic Record Carriers (AREA)
- Electrochemical Coating By Surface Reaction (AREA)
- Magnetic Record Carriers (AREA)
Abstract
PURPOSE: To reduce mirror-dents and improve surface roughness by subjecting a metallic substrate of an Al alloy or the like to an anodizing treatment by using an electrolyte consisting essentially of NaOH and added with glycerol or arabitol as additives.
CONSTITUTION: An Al blank material is lathed, and is anodized by using an alkaline soln., after which the surface is worked with abrasives and is subjected to magnetic film sputtering, whereby a magnetic disc substrate is produced. In an alkaline anodization method as a substrate working method for such disc substrate, an electrolyte consisting basically of NaOH, and added with 1 kind of saponins such as glycerol, hederin, crystal violet and arabitol as additives is used. Then, the dissolution of intermetallic compds. and non-metallic compds. contained in the Al alloy is suppressed, micro-dents are reduced and the surface roughness is improved.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9391181A JPS5836074B2 (en) | 1981-06-19 | 1981-06-19 | Manufacturing method of magnetic disk substrate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9391181A JPS5836074B2 (en) | 1981-06-19 | 1981-06-19 | Manufacturing method of magnetic disk substrate |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57210997A true JPS57210997A (en) | 1982-12-24 |
JPS5836074B2 JPS5836074B2 (en) | 1983-08-06 |
Family
ID=14095652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9391181A Expired JPS5836074B2 (en) | 1981-06-19 | 1981-06-19 | Manufacturing method of magnetic disk substrate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5836074B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102054965B1 (en) | 2018-03-08 | 2019-12-11 | 삼성전기주식회사 | Time domain temperature sensor circuit with improved resolution |
-
1981
- 1981-06-19 JP JP9391181A patent/JPS5836074B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5836074B2 (en) | 1983-08-06 |
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