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JPS57210997A - Production of magnetic disc substrate - Google Patents
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JPS57210997A - Production of magnetic disc substrate - Google Patents

Production of magnetic disc substrate

Info

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
Application number
JP9391181A
Other languages
Japanese (ja)
Other versions
JPS5836074B2 (en
Inventor
Hideo Tsunoda
Heihachiro Hirabayashi
Yoshio Ito
Mitsuhiro Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
NTT Inc
Original Assignee
NGK Insulators Ltd
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NGK Insulators Ltd, Nippon Telegraph and Telephone Corp filed Critical NGK Insulators Ltd
Priority to JP9391181A priority Critical patent/JPS5836074B2/en
Publication of JPS57210997A publication Critical patent/JPS57210997A/en
Publication of JPS5836074B2 publication Critical patent/JPS5836074B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Electrochemical Coating By Surface Reaction (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of 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
JP9391181A 1981-06-19 1981-06-19 Manufacturing method of magnetic disk substrate Expired JPS5836074B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
JPS5836074B2 (en) 1983-08-06

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