GLASS BLANK, GLASS BLANK MANUFACTURING METHOD, MANUFACTURING METHOD FOR SUBSTRATE FOR INFORMATION RECORDING MEDIUM, AND MANUFACTURING METHOD FOR INFORMATION RECORDING MEDIUM

GLASS BLANK, GLASS BLANK MANUFACTURING METHOD, MANUFACTURING METHOD FOR SUBSTRATE FOR INFORMATION RECORDING MEDIUM, AND MANUFACTURING METHOD FOR INFORMATION RECORDING MEDIUM

TO SECURE EXCELLENT FLATNESS WHEN A SUBSTRATE FOR AN INFORMATION RECORDING MEDIUM (102) IS MANUFACTURED USING A GLASS BLANK (1, 100, 100H, 100C), AND SUPPRESS OCCURRENCE OF A DEPRESSED TRACK (114P, 114Q) EVEN IF THE GLASS BLANK (1, 100, 100H, 100C) IS THINNED TO REDUCE A PROCESSING AMOUNT OF THE GLA...

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Bibliographische Detailangaben
Hauptverfasser: NAGAKURA,KATSUYA, OSAKABE,KINOBU, SUZUKI,OSAMU, KOGUCHI,KATSUYOSHI, HAYASHI,TOMONARI, ISONO,HIDEKI
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
GLASS
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
METALLURGY
MINERAL OR SLAG WOOL
PHYSICS
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Beschreibung
Zusammenfassung:TO SECURE EXCELLENT FLATNESS WHEN A SUBSTRATE FOR AN INFORMATION RECORDING MEDIUM (102) IS MANUFACTURED USING A GLASS BLANK (1, 100, 100H, 100C), AND SUPPRESS OCCURRENCE OF A DEPRESSED TRACK (114P, 114Q) EVEN IF THE GLASS BLANK (1, 100, 100H, 100C) IS THINNED TO REDUCE A PROCESSING AMOUNT OF THE GLASS BLANK (1, 100, 100H, 100C), PROVIDED IS A GLASS BLANK (1, 100, 100H, 100C), INCLUDING: A THIN PORTION (10, 110) HAVING A DISC SHAPE; AND A THIN PORTION (12, 112) PROVIDED ALONG A PERIPHERAL PORTION OF THE THIN PORTION (10, 110) SO AS TO FORM A PROJECTING PORTION (12U, 12D, 112U, 112D) AT EACH OF BOTH SURFACES OF THE THIN PORTION (10, 110), IN WHICH A RADIAL WIDTH (W1) OF THE PROJECTING PORTION (12D) ON ONE SURFACE SIDE IS LARGER IN A DIAMETER DIRECTION OF THE THIN PORTION (10, 110) THAN A RADIAL WIDTH (W2) OF THE PROJECTING PORTION (12U) ON ANOTHER SURFACES SIDE. FURTHER PROVIDED ARE A GLASS BLANK (1, 100, 100H, 100C) MANUFACTURING METHOD, A MANUFACTURING METHOD FOR A SUBSTRATE FOR AN INFORMATION RECORDING MEDIUM (102) USING THE GLASS BLANK (1, 100, 100H, 100C), AND A MANUFACTURING METHOD FOR AN INFORMATION RECORDING MEDIUM USING GLASS BLANK (1, 100, 100H, 100C). THE MOST ILLUSTRATIVE DRAWING IS