GB2179486B - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number: GB2179486B
Authority: GB; United Kingdom
Prior art keywords: recording medium; magnetic recording; magnetic; medium; recording
Prior art date: 1985-08-22
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.): Expired

Application number

GB8619797A

Other versions

GB2179486A (en

GB8619797D0 (en

Inventor

Joichiro Ezaki

Yoshiaki Ito

Haruyuki Morita

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.)

TDK Corp

Original Assignee

TDK 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.)

1985-08-22

Filing date

1986-08-14

Publication date

1989-11-15

1986-08-14 Application filed by TDK Corp filed Critical TDK Corp

1986-09-24 Publication of GB8619797D0 publication Critical patent/GB8619797D0/en

1987-03-04 Publication of GB2179486A publication Critical patent/GB2179486A/en

1989-11-15 Application granted granted Critical

1989-11-15 Publication of GB2179486B publication Critical patent/GB2179486B/en

Status Expired legal-status Critical Current

Classifications

- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
- G11B5/739—Magnetic recording media substrates
- G11B5/73911—Inorganic substrates
- G11B5/73921—Glass or ceramic substrates

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Ceramic Engineering (AREA)
Inorganic Chemistry (AREA)
Magnetic Record Carriers (AREA)

GB8619797A 1985-08-22 1986-08-14 Magnetic recording medium Expired GB2179486B (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
JP60183022A JPS6243819A (en)	1985-08-22	1985-08-22	Magnetic recording medium

Publications (3)

Publication Number	Publication Date
GB8619797D0 GB8619797D0 (en)	1986-09-24
GB2179486A GB2179486A (en)	1987-03-04
GB2179486B true GB2179486B (en)	1989-11-15

Family

ID=16128367

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
GB8619797A Expired GB2179486B (en)	1985-08-22	1986-08-14	Magnetic recording medium

Country Status (4)

Country	Link
JP (1)	JPS6243819A (en)
DE (1)	DE3628225A1 (en)
FR (1)	FR2586496A1 (en)
GB (1)	GB2179486B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0256278A1 (en) *	1986-07-16	1988-02-24	Siemens Aktiengesellschaft	Magnetic disc and process for its manufacture
EP0263512B1 (en) *	1986-10-09	1994-06-01	Asahi Glass Company Ltd.	Glass substrate for a magnetic disc and process for its production
JPH0695363B2 (en) *	1987-08-27	1994-11-24	ティーディーケイ株式会社	Magnetic recording / reproducing device
US4833556A (en) *	1987-12-22	1989-05-23	Eastman Kodak Company	Low drag stabilizer device for stabilizing the interface between a transducer and a moving medium
US5268799A (en) *	1989-02-27	1993-12-07	Tdk Corporation	Magnetic recording and reproducing apparatus
JPH03245322A (en) *	1989-03-29	1991-10-31	Asahi Glass Co Ltd	Manufacture of glass substrate for magnetic disc
JP2840966B2 (en) *	1989-11-08	1998-12-24	ティーディーケイ株式会社	Magnetic recording medium and magnetic recording / reproducing method
US6236542B1 (en)	1994-01-21	2001-05-22	International Business Machines Corporation	Substrate independent superpolishing process and slurry
JP3989988B2 (en) *	1996-09-04	2007-10-10	Ｈｏｙａ株式会社	Information recording medium substrate, magnetic disk, and manufacturing method thereof
US6120922A (en) *	1997-04-28	2000-09-19	Goto; Naoyuki	Glass-ceramic substrate for a magnetic information storage medium

Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB2167448A (en) *	1984-11-02	1986-05-29	Hitachi Ltd	Perpendicular magnetic recording medium

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4254189A (en) *	1979-07-05	1981-03-03	Memorex Corporation	Disc having substrate, intermediate layer and magnetically sensitive layer wherein intermediate layer has melting point less than annealing temperature of substrate but higher than processing temperature of magnetically sensitive layer
JPS6035333A (en) *	1983-08-08	1985-02-23	Kao Corp	Substrate for magnetic disk

1985
- 1985-08-22 JP JP60183022A patent/JPS6243819A/en active Pending
1986
- 1986-08-14 GB GB8619797A patent/GB2179486B/en not_active Expired
- 1986-08-20 DE DE19863628225 patent/DE3628225A1/en not_active Withdrawn
- 1986-08-22 FR FR8611996A patent/FR2586496A1/en not_active Withdrawn

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB2167448A (en) *	1984-11-02	1986-05-29	Hitachi Ltd	Perpendicular magnetic recording medium

Also Published As

Publication number	Publication date
GB2179486A (en)	1987-03-04
JPS6243819A (en)	1987-02-25
GB8619797D0 (en)	1986-09-24
FR2586496A1 (en)	1987-02-27
DE3628225A1 (en)	1987-02-26

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Legal Events

Date	Code	Title	Description
1994-04-13	PCNP	Patent ceased through non-payment of renewal fee	Effective date: 19930814