Glass composition and substrate for information recording medium
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03C-003/085
C03C-003/087
출원번호
US-0401126
(1999-09-22)
우선권정보
JP-0268359 (1998-09-22)
발명자
/ 주소
Shoichi Kishimoto JP
Akihiro Koyama JP
Junji Kurachi JP
Nobuyuki Yamamoto JP
출원인 / 주소
Nippon Sheet Glass Co., Ltd. JP
대리인 / 주소
Sughrue Mion, PLLC
인용정보
피인용 횟수 :
31인용 특허 :
10
초록▼
A glass composition having a high Young's modulus and a low density is disclosed which can be mass-produced by a continuous process and easily made to have high surface smoothness. Also disclosed are a substrate including the glass composition and reduced in bending and resonance even upon high-spee
A glass composition having a high Young's modulus and a low density is disclosed which can be mass-produced by a continuous process and easily made to have high surface smoothness. Also disclosed are a substrate including the glass composition and reduced in bending and resonance even upon high-speed rotation, a recording medium usable at a lower flying height, and an information recording device having a higher recording capacity and a shorter access time. The glass composition includes, in terms of mol %, 40 to 55% silicon dioxide (SiO2), 0.5 to 6% aluminum oxide (Al2O3), 2 to 20% lithium oxide (Li2O), 0 to 10% sodium monoxide ((Na2O), 2 to 30% R2O (R2O=Li2O+Na2O), 5 to 25% magnesium oxide (MgO), 0 to 25% calcium oxide (CaO), 0 to 10% strontium oxide (SrO), 10 to 40% RO (RO=MgO+CaO+SrO), 0 to 10% titanium dioxide (TiO2), and 0 to 5% zirconium oxide (ZrO2).
대표청구항▼
1. A glass composition comprising, in terms of mol %,40 to 55% silicon dioxide (SiO2), 0.5 to 6% aluminum oxide (Al2O3), 2 to 20% lithium oxide (Li2O), 0 to 10% sodium monoxide ((Na2O), 2 to 30% R2O (R2O=Li2O+Na2O), 5 to 25% magnesium oxide (MgO), 0 to 25% calcium oxide (CaO), 0 to 10% strontium oxi
1. A glass composition comprising, in terms of mol %,40 to 55% silicon dioxide (SiO2), 0.5 to 6% aluminum oxide (Al2O3), 2 to 20% lithium oxide (Li2O), 0 to 10% sodium monoxide ((Na2O), 2 to 30% R2O (R2O=Li2O+Na2O), 5 to 25% magnesium oxide (MgO), 0 to 25% calcium oxide (CaO), 0 to 10% strontium oxide (SrO), 10 to 40% RO (RO=MgO+CaO+SrO), 0 to 10% titanium dioxide (TiO2), and 0 to 5% zirconium oxide (ZrO2), wherein the ratio of the content of Al2O3 to that of (Li2O+Na2O) is 0.25 or smaller and further wherein the glass composition contains either no yttrium oxide (Y2O3) or contains Y2O3 only as an impurity.
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이 특허에 인용된 특허 (10)
Akihiro Koyama JP; Shoichi Kishimoto JP; Junji Kurachi JP; Nobuyuki Yamamoto JP, Glass composition and substrate for information recording media comprising the same.
Kurachi Junji,JPX ; Koyama Akihiro,JPX ; Kishimoto Shoichi,JPX ; Yamamoto Nobuyuki,JPX, Glass composition and substrate for information recording media comprising the same.
Kishimoto, Shoichi; Koyama, Akihiro; Tanaka, Hiroyuki; Yamamoto, Nobuyuki, Glass article and glass substrate for information recording media using the same.
Ikenishi, Mikio; Morita, Atsuko; Zou, Xuelu, Glass substrate for information recording medium and magnetic information recording medium to which the glass substrate is applied.
Ikenishi, Mikio; Morita, Atsuko; Zou, Xuelu, Glass substrate for information recording medium and magnetic information recording medium to which the glass substrate is applied.
Ikenishi, Mikio; Morita, Atsuko; Zou, Xuelu, Glass substrate for information recording medium and magnetic information recording medium to which the glass substrate is applied.
Ikenishi,Mikio; Morita,Atsuko; Zou,Xuelu, Glass substrate for information recording medium and magnetic information recording medium to which the glass substrate is applied.
McGinnis, Peter B.; Hofmann, Douglas; Baker, David J.; Wingert, John W.; Bemis, Byron, Method of manufacturing S-glass fibers in a direct melt operation and products formed therefrom.
McGinnis, Peter Bernard; Hofmann, Douglas; Baker, David J.; Wingert, John W.; Bemis, Byron, Method of manufacturing high strength glass fibers in a direct melt operation and products formed there from.
Grubka, Lawrence Jerome; Ray, Brian Robert; Wilson, Geoffrey Howard; Devlin, John Paul; Swett, David; Breneman, Mark Bui; Pelletier, James Steven; Maw, Kurt Michael, Ridge vent.
Grubka, Lawrence J; Ray, Brian R; Wilson, Geoffrey H; Devlin, John P; Swett, David; Pelletier, James S; Maw, Kurt M; Breneman, Mark Bui, Shingle ridge vent.
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