Title:
磁気ディスク用ガラス基板の製造方法
Document Type and Number:
Japanese Patent JP5209807
Kind Code:
B2
Abstract:
The present invention provides a method for efficiently manufacturing a glass substrate for magnetic disk having good accuracy of a surface irregularity and an impact resistance. The method includes the steps of: performing press forming to molten glass to prepare a sheet glass material, the sheet glass material having a roughness of the principal surface of 0.01 μm or less and target flatness of a glass substrate for magnetic disk; chemically strengthening the sheet glass material by dipping the sheet glass material in a chemically strengthening salt, thereby preparing a disk substrate; polishing the principal surfaces of the disk substrate. A thickness of the sheet glass material prepared in the press forming step is larger than a target thickness of the glass substrate for magnetic disk by a polishing quantity of the principal surface polishing step.
Inventors:
Shinji Eda
Hideki Isono
Hideki Isono
Application Number:
JP2012074005A
Publication Date:
June 12, 2013
Filing Date:
March 28, 2012
Export Citation:
Assignee:
HOYA CORPORATION
International Classes:
G11B5/84; C03B11/00; C03C19/00
Domestic Patent References:
| JP3709033B2 | ||||
| JP11228150A |
Attorney, Agent or Firm:
Global IP Tokyo Patent Business Corporation
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