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Patent Searching and Data


Title:
GLASS FOR DATA STORAGE MEDIUM SUBSTRATES, GLASS SUBSTRATE FOR DATA STORAGE MEDIUM, AND MAGNETIC DISK
Document Type and Number:
WIPO Patent Application WO/2017/204143
Kind Code:
A1
Abstract:
The present invention provides: a glass for data storage medium substrates, which is easy to recognize in a production process and which enables shards of the glass caused by cracking or chipping to be easily found; a glass substrate for a data storage medium comprising the glass; and a magnetic disk. The present invention pertains to a glass for data storage medium substrates, which has a glass composition falling within a specific range and which has a transmittance falling within a specific range at a wavelength of 450 nm and at a wavelength of 250 nm.

Inventors:
MAEDA Eriko (Limited 5-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
KUROIWA Yutaka (Limited 5-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
NAKASHIMA Tetsuya (Limited 5-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
NAGAI Kensuke (Limited 5-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
NISHIZAWA Manabu (Limited 5-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 05, 〒1008405, JP)
Application Number:
JP2017/018989
Publication Date:
November 30, 2017
Filing Date:
May 22, 2017
Export Citation:
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Assignee:
ASAHI GLASS COMPANY, LIMITED (5-1 Marunouchi 1-chome, Chiyoda-ku Tokyo, 05, 〒1008405, JP)
International Classes:
C03C3/091; C03C3/085; C03C3/087; C03C3/093; C03C3/095; C03C3/097; G11B5/73; G11B5/82
Foreign References:
JP2002201040A2002-07-16
JP2013028512A2013-02-07
JP2010254549A2010-11-11
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (Toranomon East Bldg. 10F, 7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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