Crystalized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
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Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substra
Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
대표청구항▼
1. A crystallized glass for an information recording disc comprising SiO2 of 35 to 55 mol %, Al2O3 equal to or more than 0 mol % and less than 5 mol %, MgO of 25 to 45 mol %, Y2O3 of 0.5 to 8 mol %, ZrO2 of 0 to 10 mol %, and TiO2 of 0 to 12 mol %, providing that ZrO2+TiO2 is of 4.5 mol % to 18 mol
1. A crystallized glass for an information recording disc comprising SiO2 of 35 to 55 mol %, Al2O3 equal to or more than 0 mol % and less than 5 mol %, MgO of 25 to 45 mol %, Y2O3 of 0.5 to 8 mol %, ZrO2 of 0 to 10 mol %, and TiO2 of 0 to 12 mol %, providing that ZrO2+TiO2 is of 4.5 mol % to 18 mol %, wherein the glass has a primary crystal phase made of a quasi-stable quartz solid solution and/or an enstatite.2. The glass according to claim 1, wherein the glass further comprises Li2O of 0 to 5 mol %, Na2O of 0 to 5 mol %, and K2O of 0 to 5 mol %, wherein Li2O+NaO2+K2O?5 mol %.3. The glass according to claim 1, wherein the glass further comprises CaO of 0 to 10 mol %, SrO of 0 to 10 mol %, BaO of 0 to 10 mol %, ZnO of 0 to 10 mol %, and NiO of 0 to 10 mol %, wherein CaO+SrO+BaO+ZnO+NiO?10 mol %.4. The glass according to claim 1, wherein the glass further comprises Ba2O3 of 0 to 5 mol %, P2O5 of 0 to 5 mol %, R2O3 of 0 to 5 mol % (wherein R is rare earth metal ion), CeO2 of 0 to 5 mol %, and N2O5 of 0 to 5 mol % (wherein N is Nb, or Ta), wherein Ba2O3+P3O5+R2O3+CeO2+N3O5?5 mol %.5. The glass according to claim 1, wherein the glass further comprises As2O3 of 0 to 2 mol %, and Sb2O3 of 0 to 2 mol %, wherein As2O3+Sb2O3?2 mol %.6. The glass according to claim 1, wherein the crystal phase has crystal grain sizes capable of forming a polished surface whose surface roughness Ra is in a range of 0.1 to 1.0 nm.7. A glass substrate for information recording disc comprising the glass of claim 1, wherein a surface of the glass for forming an information recording layer has a surface roughness Ra in a range of 0.1 to 1.0 nm.8. An information recording medium comprising the glass substrate of claim 7 and a recording layer formed on the glass substrate.9. A magnetic recording disc comprising the glass substrate of claim 7 and a magnetic recording layer formed on the glass substrate.
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이 특허에 인용된 특허 (16)
Beall George H. ; Pinckney Linda R., .beta.-quartz-based glass-ceramics.
Zou Xuelu,JPX ; Azegami Kouji,JPX, Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate.
Zou, Xuelu; Azegami, Kouji, Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate.
Zou Xuelu,JPX ; Toratani Hisayoshi,JPX, Method for selecting a material suitable for a substrate for information recording media, material selected using this m.
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