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    • 1. 发明申请
    • GLASS SUBSTRATE FOR MAGNETIC DISK AND METHOD FOR PRODUCING THE SAME
    • 用于磁盘的玻璃基板及其制造方法
    • US20100136372A1
    • 2010-06-03
    • US12628484
    • 2009-12-01
    • Mizuho ISHIDANorihito ShidaKatsuhiro MatsumotoKazuo Mannami
    • Mizuho ISHIDANorihito ShidaKatsuhiro MatsumotoKazuo Mannami
    • G11B5/706B24B1/00
    • G11B5/8404B24B37/24B24D3/32
    • The present invention relates to a method for producing a glass substrate for a magnetic disk, the method including a step of polishing a main surface of a circular glass plate while supplying a polishing slurry containing a polishing material, in which polishing is performed, after a polishing surface is subjected to dressing treatment, by using a polishing pad having: a first resin foam layer which forms the polishing surface, includes a resin foam having pores with a pore diameter of more than 20 μm and has a thickness of 400 μm or less; and a second resin foam layer which is provided between a platen for fixing the polishing pad and the first resin foam layer, includes a resin foam having pores with a pore diameter of 20 μm or less and has a thickness of 50 to 250 μm, and in which a total thickness of the first resin foam layer and the second resin foam layer is 550 μm or less, and a international rubber hardness degree of the polishing pad measured by the M method according to JIS K6253 is 40 IRHD or more.
    • 本发明涉及一种用于制造磁盘用玻璃基板的方法,所述方法包括以下步骤:向所述圆形玻璃板的主表面进行抛光,同时向所述抛光材料供给包含抛光材料的抛光浆料 通过使用具有:形成研磨面的第一树脂发泡层的研磨垫,进行敷料处理,包括孔径在20μm以上,厚度为400μm以下的孔的树脂发泡体 ; 以及第二树脂泡沫层,其设置在用于固定所述抛光垫的台板和所述第一树脂发泡层之间,包括具有孔径为20μm以下且具有50〜250μm的厚度的孔的树脂发泡体,以及 其中第一树脂发泡层和第二树脂发泡层的总厚度为550μm以下,通过根据JIS K6253的M法测定的研磨垫的国际橡胶硬度为40IRHD以上。
    • 3. 发明授权
    • Glass substrate for magnetic disk and method for producing the same
    • 磁盘用玻璃基板及其制造方法
    • US08092280B2
    • 2012-01-10
    • US12628484
    • 2009-12-01
    • Mizuho IshidaNorihito ShidaKatsuhiro MatsumotoKazuo Mannami
    • Mizuho IshidaNorihito ShidaKatsuhiro MatsumotoKazuo Mannami
    • B24B7/19C03B17/00G11B5/65
    • G11B5/8404B24B37/24B24D3/32
    • The present invention relates to a method for producing a glass substrate for a magnetic disk, the method including a step of polishing a main surface of a circular glass plate while supplying a polishing slurry containing a polishing material, in which polishing is performed, after a polishing surface is subjected to dressing treatment, by using a polishing pad having: a first resin foam layer which forms the polishing surface, includes a resin foam having pores with a pore diameter of more than 20 μm and has a thickness of 400 μm or less; and a second resin foam layer which is provided between a platen for fixing the polishing pad and the first resin foam layer, includes a resin foam having pores with a pore diameter of 20 μm or less and has a thickness of 50 to 250 μm, and in which a total thickness of the first resin foam layer and the second resin foam layer is 550 μm or less, and a international rubber hardness degree of the polishing pad measured by the M method according to JIS K6253 is 40 IRHD or more.
    • 本发明涉及一种用于制造磁盘用玻璃基板的方法,所述方法包括以下步骤:向所述圆形玻璃板的主表面进行抛光,同时向所述抛光材料供给包含抛光材料的抛光浆料 通过使用具有:形成研磨面的第一树脂发泡层的研磨垫,进行敷料处理,包括孔径在20μm以上,厚度为400μm以下的孔的树脂发泡体 ; 以及第二树脂泡沫层,其设置在用于固定所述抛光垫的台板和所述第一树脂发泡层之间,包括具有孔径为20μm以下且具有50〜250μm的厚度的孔的树脂发泡体,以及 其中第一树脂发泡层和第二树脂发泡层的总厚度为550μm以下,通过根据JIS K6253的M法测定的研磨垫的国际橡胶硬度为40IRHD以上。