公开(公告)号：US20030121285A1

公开(公告)日：2003-07-03

申请号：US10300383

申请日：2002-11-20

Applicant: NIPPON SHEET GLASS CO., LTD.

Inventor： Masamichi Kesuka ,  Koji Okuhata ,  Kensuki Matsuno ,  Takeo Watanabe

IPC: C03C019/00

CPC classification number: G11B5/7315 ,  C03C19/00 ,  G11B5/8404 ,  G11B7/00 ,  G11B11/10589

Abstract: The present invention relates to a substrate for information recording media for use as a disk substrate in a hard disk drive or the like and a manufacturing method thereof, an information recording medium such as a magnetic disk, and a starting material glass plate for use as a starting material of the substrate for information recording media. By suitably controlling forming conditions of the starting material glass plate, the starting material glass plate can be manufactured so as to have a long-wavelength waviness of not more than 6 nm. By carrying out precision polishing on this starting material glass plate having a long-wavelength waviness of not more than 6 nm using CeO2 abrasive grains having a mean grain diameter of not less than 0.01 nullm and a 90% diameter of the volume grain size distribution of not more than 0.02 nullm, a substrate for information recording media having an excellent planarity can be obtained in a short time and with a low polishing amount. Moreover, by using this substrate for information recording media, an information recording medium able to cope with increased data zone recording density can be provided.

Abstract translation: 本发明涉及一种在硬盘驱动器等中用作盘基板的信息记录介质用基板及其制造方法，磁盘等信息记录介质，以及用作 用于信息记录介质的基板的起始材料。 通过适当地控制起始材料玻璃板的成形条件，可以制造起始材料玻璃板，使其长​​波长波纹不大于6nm。 通过使用平均粒径不小于0.01μm的CeO 2磨粒和90nm直径的体积粒径分布的直径，将该波长波纹不大于6nm的原料玻璃板进行精密抛光 不超过0.02μm，可以在短时间内以低抛光量获得具有优异平面度的信息记录介质用基板。 此外，通过使用该基板进行信息记录介质，可以提供能够应对增加的数据区记录密度的信息记录介质。