Title:
METHOD OF CHEMICAL STRENGTHENING TREATMENT FOR MAGNETIC DISK GLASS SUBSTRATE
Document Type and Number:
WIPO Patent Application WO/2005/031715
Kind Code:
A1
Abstract:
Chemical strengthening treatment is performed by first providing a granular chemical strengthening salt so as to prevent spread in atmosphere at the time of introduction of chemical strengthening salt in a treating vessel, introducing the chemical strengthening salt in a treating vessel, melting the chemical strengthening salt into molten chemical strengthening salt and bringing a glass disc into contact with the molten chemical strengthening salt. The granular chemical strengthening salt is, for example, one obtained by forming of a powdery chemical strengthening salt material into grains. A chemically strengthened glass substrate for magnetic disk can be obtained through the process of carrying out chemical strengthening treatment of magnetic disk glass substrates. A magnetic disk can be obtained by forming at least a magnetic layer on the chemically strengthened glass substrate for magnetic disk.
Inventors:
KAMIYA NAOHIRO
ISONO HIDEKI
ISONO HIDEKI
Application Number:
PCT/JP2004/014564
Publication Date:
April 07, 2005
Filing Date:
September 28, 2004
Export Citation:
Assignee:
HOYA CORP (JP)
KAMIYA NAOHIRO
ISONO HIDEKI
KAMIYA NAOHIRO
ISONO HIDEKI
International Classes:
C03C21/00; G11B5/73; G11B5/84; (IPC1-7): G11B5/84; C03C21/00; G11B5/73
Foreign References:
| JP2002179415A | 2002-06-26 | |||
| JPH07109112A | 1995-04-25 | |||
| JP2000203888A | 2000-07-25 | |||
| JP2001006168A | 2001-01-12 | |||
| JP2001072444A | 2001-03-21 | |||
| JPH1125454A | 1999-01-29 | |||
| JPH10194786A | 1998-07-28 | |||
| JPH10194785A | 1998-07-28 |
Attorney, Agent or Firm:
Goto, Yosuke (4-10 Nishishinbashi 1-chom, Minato-ku Tokyo 03, JP)
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