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1. (WO2017110109) GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2017/110109 International Application No.: PCT/JP2016/063215
Publication Date: 29.06.2017 International Filing Date: 27.04.2016
IPC:
G11B 5/73 (2006.01) ,C03C 3/085 (2006.01) ,C03C 3/087 (2006.01) ,C03C 3/091 (2006.01) ,G11B 5/82 (2006.01)
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
62
Record carriers characterised by the selection of the material
73
Base layers
C CHEMISTRY; METALLURGY
03
GLASS; MINERAL OR SLAG WOOL
C
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
3
Glass compositions
04
containing silica
076
with 40% to 90% silica by weight
083
containing aluminium oxide or an iron compound
085
containing an oxide of a divalent metal
C CHEMISTRY; METALLURGY
03
GLASS; MINERAL OR SLAG WOOL
C
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
3
Glass compositions
04
containing silica
076
with 40% to 90% silica by weight
083
containing aluminium oxide or an iron compound
085
containing an oxide of a divalent metal
087
containing calcium oxide, e.g. common sheet or container glass
C CHEMISTRY; METALLURGY
03
GLASS; MINERAL OR SLAG WOOL
C
CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
3
Glass compositions
04
containing silica
076
with 40% to 90% silica by weight
089
containing boron
091
containing aluminium
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
5
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
74
Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
82
Disc carriers
Applicants:
旭硝子株式会社 ASAHI GLASS COMPANY, LIMITED [JP/JP]; 東京都千代田区丸の内一丁目5番1号 5-1, Marunouchi 1-chome, Chiyoda-ku, Tokyo 1008405, JP
Inventors:
大塚 晴彦 OTSUKA Haruhiko; JP
山口 龍 YAMAGUCHI Ryu; JP
Agent:
特許業務法人栄光特許事務所 EIKOH PATENT FIRM, P.C.; 東京都港区西新橋一丁目7番13号 虎ノ門イーストビルディング10階 Toranomon East Bldg. 10F, 7-13, Nishi-Shimbashi 1-chome, Minato-ku, Tokyo 1050003, JP
Priority Data:
2015-25538525.12.2015JP
2016-08317518.04.2016JP
Title (EN) GLASS SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM
(FR) SUBSTRAT DE VERRE POUR SUPPORT D'ENREGISTREMENT MAGNÉTIQUE, ET SUPPORT D'ENREGISTREMENT MAGNÉTIQUE
(JA) 磁気記録媒体用ガラス基板、磁気記録媒体
Abstract:
(EN) The present invention relates to a glass substrate for a magnetic recording medium having a pair of main surfaces, an outer peripheral end surface, and an inner peripheral end surface and formed in a donut shape, wherein in a cross-section orthogonal to the pair of main surfaces and passing through the center axis of the glass substrate for the magnetic recording medium, a n angle between the X axis and a straight line connecting a point on the outer peripheral end surface where the X-coordinate is 5 ìm and a point on the outer peripheral end surface where the X-coordinate is 10 ìm is between 81° and 85° inclusive , an angl e between the X axis and a straight line connecting a point where the X-coordinate is 10 ìm and a point where the X-coordinate is 20 ìm is between 69° and 83° inclusive , and an angle between the X axis and a straight line connecting a point where the X-c oordinate is 20 ìm and a point where the X-coordinate is 30 ìm is between 52° and 72° inclusive, where the axis parallel to the main surface represents the X-axis , the X-coordinate at the outermost peripheral position on the outer peripheral end surface represents 0 , and the X-coordinates from the outermost peripheral position on the outer peripheral end surface toward the central axis of the glass substrate for the magnetic recording medium are positive.
(FR) La présente invention concerne un substrat en verre pour un support d'enregistrement magnétique ayant une paire de surfaces principales, une surface d'extrémité périphérique externe, et une surface d'extrémité périphérique intérieure, et ayant une forme torique, dans lequel, dans une section transversale orthogonale à la paire de surfaces principales et traversant l'axe central du substrat en verre pour le support d'enregistrement magnétique, un angle entre l'axe X et une ligne droite qui relie un point sur la surface d'extrémité périphérique externe où la coordonnée X est 5 ìm et un point sur la surface d'extrémité périphérique externe où la coordonnée X est 10 ìm, est compris entre 81° et 85° inclus, un angle entre l'axe X et une ligne droite qui relie un point où la coordonnée X est 10 ìm et un point où la coordonnée X est 20 ìm, est entre 69° et 83° inclus, et un angle entre l'axe X et une ligne droite qui relie un point où la coordonnée X- est 20 ìm et un point où la coordonnée X est 30 ìm, est entre 52° et 72° inclus, dans lequel l'axe parallèle à la surface principale représente l'axe X, la coordonnée X à la position périphérique la plus externe sur la surface d'extrémité périphérique extérieure représente 0, et les coordonnées X de la position périphérique la plus externe sur la surface d'extrémité périphérique externe vers l'axe central du substrat en verre pour le support d'enregistrement magnétique sont positives.
(JA) 本発明は、一対の主表面、外周端面、及び内周端面を有するドーナツ形状の磁気記録媒体用ガラス基板であって、一対の主表面と垂直でかつ磁気記録媒体用ガラス基板の中心軸を通る断面において、主表面と平行な軸をX軸とし、外周端面の最外周位置のX座標を0、外周端面の最外周位置よりも磁気記録媒体用ガラス基板の中心軸側のX座標を正とした場合に、外周端面のうち、X座標が5μmの点と、X座標が10μmの点とを結んだ直線と、X軸とが形成する角度が81°以上85°以下、X座標が10μmの点と、X座標が20μmの点とを結んだ直線と、X軸とが形成する角度が69°以上83°以下、X座標が20μmの点と、X座標が30μmの点とを結んだ直線と、X軸とが形成する角度が52°以上72°以下、である磁気記録媒体用ガラス基板に関する。
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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, IR, IS, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, 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, SA, 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 (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, 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, KM, ML, MR, NE, SN, TD, TG)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)