Title:
GLASS SUBSTRATE FOR HARD DISK AND MANUFACTURING METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2014/156189
Kind Code:
A1
Abstract:
[Problem] The objective of the present invention is to provide a method for manufacturing a superior glass substrate for a hard disk, which is capable of sufficiently suppressing fluttering and crashing of a head, and which is capable of securing quality which meets a demand for high density. [Solution] The present invention is a manufacturing method for a glass substrate for a hard disk, the manufacturing method for the glass substrate for the hard disk characterized in including a processing step in which, when an end portion shape of both main surfaces of the glass substrate is defined to be a shape of a range from a position of starting to descend or to rise, compared with a central portion, on a front face or a rear face, to an outer diameter position of the same, adjusting of the end portion shape is performed so that the average value (∆CAve) of the end portion shape difference between the front face and the rear face on the glass substrate is less than or equal to 1000 nm.
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Inventors:
TSUKADA KAZUYA (JP)
Application Number:
PCT/JP2014/001834
Publication Date:
October 02, 2014
Filing Date:
March 28, 2014
Export Citation:
Assignee:
HOYA CORP (JP)
International Classes:
G11B5/84; G11B5/73
Foreign References:
| JP2010073289A | 2010-04-02 | |||
| JP2011000704A | 2011-01-06 | |||
| JP2012198976A | 2012-10-18 | |||
| JP2012022730A | 2012-02-02 |
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
Etsuji Kotani (JP)
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