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Process for producing glass substrate for magnetic disk and process for manufacturing magnetic disk

一种玻璃衬底、制造方法的技术，应用在制造基底层、唱片载体制造等方向，达到抑制微小波纹、防止热不均匀、防止磁头碰撞的效果

Inactive Publication Date: 2009-01-28
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, glass substrates also have the negative characteristic of being a brittle material

Method used

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  • Process for producing glass substrate for magnetic disk and process for manufacturing magnetic disk
  • Process for producing glass substrate for magnetic disk and process for manufacturing magnetic disk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0126] Hereinafter, it demonstrates concretely by giving an Example and a comparative example. In addition, this invention is not limited to the structure of these Examples.

[0127] [Example of Manufacturing Method of Glass Substrate for Magnetic Disk]

[0128] The manufacturing method of the glass substrate for magnetic disks in this embodiment described below consists of the following steps (1) to (9).

[0129] (1) Rough friction process (rough grinding process)

[0130] (2) Shape processing process

[0131] (3) Fine friction process (finish grinding process)

[0132] (4) End mirror processing (polishing) process

[0133] (5) The first grinding (polishing) process

[0134] (6) The second grinding (polishing) process

[0135] (7) Chemical enhancement process

[0136] (8) Cooling process

[0137] (9) Cleaning process

[0138] First, a disk-shaped glass base material made of amorphous aluminosilicate glass is prepared. This aluminosilicate glass contains lithium. Th...

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Abstract

This invention provides a method for manufacturing a glass substrate for a magnetic disk comprising a chemical strengthening step. The method provides a glass substrate for a magnetic disk that can suppress the occurrence of very small waves in cooling a glass substrate after the chemical strengthening step, and, while preventing troubles such as head crush and thermal asperity, can realize lowered flying height of a magnetic head and high-density information recording, and is particularly suitable for application to small-size magnetic disks for portable information equipment. In the step of cooling after the chemical strengthening step, cooling treatment is carried out in which the glass substrate is brought into contact with a treatment liquid containing a melt of a material having a solidification temperature below that of a chemical strengthening salt. The temperature of the treatment liquid is regulated to be below the temperature of the chemical strengthening salt melted liquid in the chemical strengthening step.

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) as a magnetic disk device, and a method of manufacturing a magnetic disk using the glass substrate for a magnetic disk. Background technique [0002] Today, information recording technology, especially magnetic recording technology, requires a dramatic technological innovation along with the development of the so-called IT industry. Furthermore, unlike other magnetic recording media such as magnetic tapes and floppy disks, magnetic disks mounted on hard disk drives (HDD), which are magnetic disk devices used as computer memories, continue to rapidly increase in information recording density. [0003] Such a magnetic disk is formed by forming a magnetic layer film or the like on a substrate such as an aluminum-based alloy substrate or a glass substrate. Then, in the hard disk drive, while flying t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00G11B5/84
CPCC03C21/002G11B5/8404
Inventor 岩田胜行
Owner HOYA CORP
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