IP Library › Granted Patent US 6,878,398
Granted Patent B2
US 6,878,398 · App. 10/838,469 · Granted Apr 12, 2005

Method of manufacturing magnetic recording medium and the magnetic recording medium

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Quick Facts
Patent No.
US 6,878,398
App. No.
10/838,469
Granted
Apr 12, 2005
Kind
B2
Abstract

A method of manufacturing a magnetic recording medium which includes a bonding sub-layer substantially and forms a lubricant layer having its enough width. A method of manufacturing a magnetic recording medium includes the steps of: a) laminating an underlayer, a magnetic layer for recording, and a protection layer of amorphous carbon on a substrate of the magnetic recording medium in turn, and b) repeating a progress to said protection layer of amorphous carbon comprising an application process of applying a lubricant, a subsequent ultraviolet rays treatment process, and a subsequent washing process for removing the lubricant which is not connected to the protection layer of amorphous carbon plural times.

Claims (8)

1. A method of manufacturing a magnetic recording medium comprising the steps of:

a) laminating an underlayer, a magnetic layer for recording, and a protection layer of amorphous carbon on a substrate of said magnetic recording medium in turn; and

b) repeating a process to said protection layer of amorphous carbon comprising an application process of applying a lubricant, an subsequent heat treatment process, and a subsequent washing process for removing said lubricant which is not connected to said protection layer of amorphous carbon plural times.

2. The method as claimed in claim 1 , wherein said lubricant is a compound of the perfluoro-polyether with an end-group including hydroxyl group.

3. A method of manufacturing a magnetic recording medium comprising the steps of:

a) laminating an underlayer, a magnetic layer for recording, and a protection layer of amorphous carbon on a substrate of said magnetic recording medium in turn; and

b) repeating a process to said protection layer of amorphous carbon comprising an application process of applying a lubricant, and a subsequent heat treatment process plural times.

4. The method as claimed in claim 3 , wherein said lubricant is a compound of the perfluoro-polyether with an end-group including hydroxyl group.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 4, 2010
From: FUJITSU LIMITED
To: SHOWA DENKO K.K.
Reel/Frame 023950/0008 →