Invention Grant
- Patent Title: Method for producing glass substrate for information recording medium
- Patent Title (中): 信息记录介质用玻璃基板的制造方法
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Application No.: US13638748Application Date: 2011-03-10
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Publication No.: US08966939B2Publication Date: 2015-03-03
- Inventor: Hazuki Nakae
- Applicant: Hazuki Nakae
- Applicant Address: JP Tokyo
- Assignee: Hoya Corporation
- Current Assignee: Hoya Corporation
- Current Assignee Address: JP Tokyo
- Agency: Brinks Gilson & Lione
- Priority: JP2010-075324 20100329
- International Application: PCT/JP2011/001410 WO 20110310
- International Announcement: WO2011/121903 WO 20111006
- Main IPC: B24B7/00
- IPC: B24B7/00 ; C03C3/04 ; B24B37/04 ; G11B5/84 ; C03C3/095 ; C08C19/00 ; G11B5/73
Abstract:
Disclosed is a method of producing a glass substrate for an information recording medium including a rough polishing step of performing a rough polishing on a glass material containing 0.01 to 2 mass % of cerium oxide; a washing step of washing the glass material after the rough polishing step, so that the cerium content of the glass material surface becomes 0.125 ng/cm2 or less; and a precision polishing step of performing precision polishing on the glass material after the washing step by cyclically using a polishing material containing colloidal silica.
Public/Granted literature
- US20130029099A1 Method for Producing Glass Substrate for Information Recording Medium Public/Granted day:2013-01-31
Information query
