Invention Grant
- Patent Title: Method of manufacturing glass substrate and information recording medium
- Patent Title (中): 制造玻璃基板和信息记录介质的方法
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Application No.: US13846405Application Date: 2013-03-18
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Publication No.: US08722138B2Publication Date: 2014-05-13
- Inventor: Hiroaki Ikeda , Masaru Suzuki , Kazuna Sasaki , Yumi Mukai , Jun Ozawa
- Applicant: Hiroaki Ikeda , Masaru Suzuki , Kazuna Sasaki , Yumi Mukai , Jun Ozawa
- Applicant Address: JP Tokyo
- Assignee: Hoya Corporation
- Current Assignee: Hoya Corporation
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP11-94409 19990331; JP11-114990 19990422
- Main IPC: C03C17/00
- IPC: C03C17/00
Abstract:
In a method of manufacturing a glass substrate for an information recording medium including a step for chemically strengthening the glass substrate by contacting the glass substrate with chemical strengthening processing liquid containing chemical strengthening salt, concentration of Fe and Cr is 500 ppb or less in said chemical strengthening salt, respectively. The concentration may be detected by the use of an ICP (Inductively Coupled Plasma) emission spectrometry analyzing method or a fluorescent X-ray spectroscopy analyzing method.
Public/Granted literature
- US20130213091A1 METHOD OF MANUFACTURING GLASS SUBSTRATE AND INFORMATION RECORDING MEDIUM Public/Granted day:2013-08-22
Information query
