Title:
GLASS SUBSTRATE, INFORMATION RECORDING MEDIUM USING GLASS SUBSTRATE, AND METHOD FOR PRODUCING GLASS SUBSTRATE
Document Type and Number:
WIPO Patent Application WO/2013/046575
Kind Code:
A1
Abstract:
Provided is a glass substrate in which a strengthening layer comprising a potassium ion exchange layer and a compressive stress layer is formed on the surface of a glass material using a chemical strengthening solution, wherein the glass substrate is characterized in that the glass material contains lithium and the thickness of the compressive stress layer is between at least 35-times to no more than 100-times the thickness of the potassium ion exchange layer. The glass substrate has excellent impact resistance even when used under harsh temperature conditions, and shows a low incidence of delayed errors due to ion elution, even when used for a high-recording-density hard disk drive.
Inventors:
SHIMAZU NORIKO (JP)
Application Number:
PCT/JP2012/005801
Publication Date:
April 04, 2013
Filing Date:
September 12, 2012
Export Citation:
Assignee:
KONICA MINOLTA ADVANCED LAYERS (JP)
SHIMAZU NORIKO (JP)
SHIMAZU NORIKO (JP)
International Classes:
G11B5/73; C03C21/00; G11B5/84
Foreign References:
| JP2008130180A | 2008-06-05 | |||
| JP2008127243A | 2008-06-05 | |||
| JP2001002451A | 2001-01-09 |
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
Etsuji Kotani (JP)
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Claims:
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