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1. (WO2013046584) HARD DISK DRIVE (HDD) GLASS BLANK, METHOD FOR MANUFACTURING HDD GLASS BLANKS, HDD GLASS SUBSTRATE, AND METHOD FOR MANUFACTURING HDD GLASS SUBSTRATES
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/2013/046584    International Application No.:    PCT/JP2012/005871
Publication Date: 04.04.2013 International Filing Date: 14.09.2012
IPC:
G11B 5/84 (2006.01), C03B 11/00 (2006.01), C03C 19/00 (2006.01), C03C 21/00 (2006.01), G11B 5/73 (2006.01)
Applicants: HOYA CORPORATION [JP/JP]; 2-7-5, Naka-Ochiai, Shinjuku-ku, Tokyo 1618525 (JP) (For All Designated States Except US).
KAJITA, Hiroshi [JP/JP]; (JP) (For US Only).
TOMISAKA, Toshiya [JP/JP]; (JP) (For US Only)
Inventors: KAJITA, Hiroshi; (JP).
TOMISAKA, Toshiya; (JP)
Agent: KOTANI, Etsuji; Osaka Nakanoshima Building 2nd Floor, 2-2, Nakanoshima 2-chome, Kita-ku, Osaka-shi, Osaka 5300005 (JP)
Priority Data:
2011-208872 26.09.2011 JP
Title (EN) HARD DISK DRIVE (HDD) GLASS BLANK, METHOD FOR MANUFACTURING HDD GLASS BLANKS, HDD GLASS SUBSTRATE, AND METHOD FOR MANUFACTURING HDD GLASS SUBSTRATES
(FR) ÉBAUCHE EN VERRE POUR DISQUE DUR (HDD), PROCÉDÉ DE FABRICATION D'ÉBAUCHES EN VERRE HDD, SUBSTRAT EN VERRE HDD, ET PROCÉDÉ DE FABRICATION DE SUBSTRATS EN VERRE HDD
(JA) HDD用ガラスブランクス、HDD用ガラスブランクスの製造方法、HDD用ガラス基板、及びHDD用ガラス基板の製造方法
Abstract: front page image
(EN)An aspect of the present invention is an HDD glass blank which has a center hole, and is characterized in that, if the radius of said center hole is regarded as r0, and the radius of the glass blank is regarded as r1, for the entire circumferences at a position of radius r = r0 + (r1 - r0)/2, the maximum value of the amount of retardation when linearly polarized light is incident on a recording surface in a perpendicular direction is not more than 20 nm/mm.
(FR)Un aspect de l'invention concerne une ébauche en verre HDD comprenant un orifice central et caractérisé en ce que, si le rayon dudit orifice central est considéré à r0, et le rayon de l'ébauche en verre est considéré à r1, pour les circonférences complètes à une position du rayon r = r0 + (r1 - r0)/2, la valeur maximale de la quantité de retard lorsque la lumière polarisée de façon linéaire rencontre une surface d'enregistrement dans une direction perpendiculaire ne dépasse pas 20 nm/mm.
(JA) 本発明の一局面は、中心孔を有し、該中心孔の半径をr、ガラスブランクスの半径をrとしたとき、半径r=r+(r-r)/2の位置の全周において、記録面に対して垂直方向に直線偏光を入射したときのリタデーション量の最大値が20nm/mm以下であることを特徴とするHDD用ガラスブランクスである。
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW.
African Regional Intellectual Property Organization (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG).
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)