METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISC

A method for producing a glass substrate for magnetic disk, which is capable of effectively removing a crack is provided. In the method for producing a glass substrate for magnetic disk, there were provided a preparation step 1 of preparing a circular glass substrate having a main surface, a back su...

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Bibliographische Detailangaben
Hauptverfasser:	MANNAMI KAZUO, MATSUMOTO KATSUHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY COMPUTING COUNTING DRESSING OR CONDITIONING OF ABRADING SURFACES FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS GLASS GRINDING HANDLING RECORD CARRIERS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER JOINING GLASS TO GLASS OR OTHER MATERIALS MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING METALLURGY MINERAL OR SLAG WOOL PERFORMING OPERATIONS PHYSICS POLISHING PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS TRANSPORTING
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Beschreibung
Zusammenfassung:	A method for producing a glass substrate for magnetic disk, which is capable of effectively removing a crack is provided. In the method for producing a glass substrate for magnetic disk, there were provided a preparation step 1 of preparing a circular glass substrate having a main surface, a back surface opposing to the main surface, an inner side surface defining a through-hole penetrating from the main surface to the back surface and an outer side surface opposing 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.