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Method for manufacturing glass substrate for magnetic disc

A technology for glass substrates and magnetic disks, which is applied in the manufacture of base layers, disc carriers, magnetic recording layers, etc., and can solve the problems of increased manufacturing costs, defects, and uneconomical production of glass substrates

Inactive Publication Date: 2009-11-18
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to defective products
[0005] In this case, unless measures such as processing at an early stage are taken for the cracked glass substrate, a lot of time and expense are wasted, so it is not economical
That is, it leads to an increase in the manufacturing cost of the glass substrate

Method used

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  • Method for manufacturing glass substrate for magnetic disc
  • Method for manufacturing glass substrate for magnetic disc
  • Method for manufacturing glass substrate for magnetic disc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] The present invention will be described in more detail by referring to the following Examples and Comparative Examples, but the present invention should not be construed as being limited to the constitution of these Examples.

[0035] First of all, prepare a sample consisting of a large number of plates of annular glass 1, and for which it has been completed up to figure 1 The end face of the annular glass 10 in the step of precision polishing step 3 was inspected to confirm the occurrence of defects in the end face portion.

[0036] Here, in order to confirm the effect of the present invention, on such as figure 1 The annular glass 10 formed through the preparatory step 1 to the precision polishing step 3 (according to the present application) in the annular glass manufacturing steps shown, two kinds of glass substrates were manufactured in the pre-grinding step 2A respectively, which include: one A type with 20μm shallow grinding amount (depth) D 1 glass substrate (...

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Abstract

Provided is a method for manufacturing a glass substrate for a magnetic disc. In the method, cracks can be effectively removed. The method is provided with a preparation step (1) of preparing a circular glass substrate. The circular glass substrate has a main surface, a rear surface facing the main surface, an inner surface constituting a through hole penetrating from the main surface to the rear surface, and an outer surface facing the inner surface. The method is also provided with a pre-polishing step (2A) of polishing the inner surface and the outer surface of the glass substrate; a lapping step (3) of lapping the polished glass substrate; and a post-polishing step (2B) of polishing the inner surface and the outer surface of the lapped glass substrate.

Description

technical field [0001] The present invention relates to a method of manufacturing a glass substrate for a magnetic disk constituting a magnetic disk used in a hard disk drive (HDD) or the like as a magnetic disk device. Background technique [0002] A personal computer (PC) or the like has a hard disk drive (HDD) or the like as an external storage device. Usually, a disk is installed on a hard drive, which is called memory of a computer or the like. The magnetic disk has a structure in which a magnetic layer and the like are formed on a suitable substrate such as an aluminum-based alloy substrate. [0003] On the other hand, in recent years, there has been an increasing need to mount hard disk drives on portable devices. Under such circumstances, glass substrates, which are materials having high strength and high rigidity, have been frequently used as substrates for magnetic disks instead of fragile metal substrates. Furthermore, glass substrates have attracted attention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C19/00G11B5/73G11B5/84
CPCC03C19/00G11B5/8404
Inventor 松本胜博万波和夫
Owner ASAHI GLASS CO LTD