METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISK

PROBLEM TO BE SOLVED: To provide a method for manufacturing a glass substrate for a magnetic disk enabling effective elimination of cracks. SOLUTION: This method for manufacturing a glass substrate for a magnetic disk comprises a preparation step 1 of preparing a circular glass substrate having a ma...

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Bibliographische Detailangaben
Hauptverfasser:	MANNAMI KAZUO, MATSUMOTO KATSUHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER JOINING GLASS TO GLASS OR OTHER MATERIALS METALLURGY MINERAL OR SLAG WOOL PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for manufacturing a glass substrate for a magnetic disk enabling effective elimination of cracks. SOLUTION: This method for manufacturing a glass substrate for a magnetic disk comprises a preparation step 1 of preparing a circular glass substrate having a main surface, a rear surface opposed to the main surface, an inner side surface constituting a through-hole penetrating from the main surface to the rear surface, and an outer side surface opposed to the inner side surface; a pre-polishing step 2A of polishing the inner side surface and the outer side surface of the glass substrate; a lapping step 3 of lapping the polished glass substrate; and a post-polishing step 2B of polishing the inner side surface and the outer side surface of the lapped glass substrate. COPYRIGHT: (C)2009,JPO&INPIT