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Method of texture processing on glass substrate for magnetic hard disk and slurry therefor

A technology of glass substrates and magnetic hard disks, applied in metal processing equipment, chemical instruments and methods, manufacturing tools, etc., can solve the problems of not being able to provide qualified products stably, small roughness, and unclear texture streaks

Inactive Publication Date: 2006-06-07
NIHON MICRO COATING
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Problems solved by technology

[0022] However, the current situation is that if the glass substrate is textured using a slurry added with a solution for the above-mentioned chemical reaction, although the roughness of the surface of the glass substrate can be made extremely small, the texture streaks are not clear. If it is not uniformly formed on the entire surface of the glass substrate, it cannot stably provide qualified products

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  • Method of texture processing on glass substrate for magnetic hard disk and slurry therefor
  • Method of texture processing on glass substrate for magnetic hard disk and slurry therefor
  • Method of texture processing on glass substrate for magnetic hard disk and slurry therefor

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Embodiment Construction

[0045] According to the glass substrate used for magnetic hard disk of the present invention, there is no abnormal protrusion exceeding 100 Å, the average surface roughness of the glass substrate is in the range of exceeding 4 Å, and the linear density is similarly formed in the radial direction of the glass substrate greater than or A glass substrate with texture striations in the range of 30 lines / μm. It is preferable that the average surface roughness of the glass substrate is in the range of more than 4 Å and less than or equal to 7 Å.

[0046] As a glass substrate, silicon dioxide (SiO 2 ), sodium oxide (Na 2 O), calcium oxide (CaO)-based soda-lime glass, silicon dioxide (SiO 2 ), alumina (Al 2 o 3 ), with R 2 Aluminosilicate glass, borosilicate glass, lithium oxide (LiO)-SiO mainly composed of O (R=potassium (K), sodium (Na) or lithium (Li)) 2 Glass, (LiO)-Al 2 o 3 -SiO 2 Glass, R’O-Al 2 o 3 -SiO 2 glass (R' = magnesium (Mg), calcium (Ca), strontium (Sr), bar...

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Abstract

A method of conducting a texture processing of a glass substrate for magnetic hard disk so that without abnormal projections exceeding 100 ¿, texture striations of 30 lines / mum line density can be formed accurately and uniformly; and a slurry for use in the texture processing. A slurry is fed onto rotating glass substrate, and processing tape is pressed against the same and run. The slurry is a dispersion of abrasive grains of artificial diamond produced by an impact process. As the abrasive grains, use is made of artificial diamond grains whose primary grain average diameter is in the range of 1 to 20 nm or cluster grains therefrom whose secondary grain average diameter is in the range of 0.05 to 0.20mum. An additive composed of a higher fatty acid amide and at least two members

Description

technical field [0001] The present invention relates to a texturing method for forming texchaya streaks on a glass substrate for a magnetic hard disk (magnetic hard disk) and a slurry used in the texturing. Background technique [0002] For information processing devices such as computers that record and reproduce information such as characters, images, and sounds, an increase in the storage capacity of information and accurate reproduction are required. [0003] Information is magnetically recorded on and reproduced from a magnetic hard disk by a magnetic head of an information processing device. [0004] The increase in the recording capacity of information and the accuracy of reproduction greatly depend on the distance between the surface of the magnetic hard disk and the magnetic head (levitation distance (floating distance)). That is, by reducing the levitation distance and stabilizing the levitation distance, it is possible to increase the recording capacity of inform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/84B24B21/00B24B21/04B24B37/00B24B37/04C03C19/00C09K3/14
CPCB24B19/028B24B21/04B24B37/042C03C19/00G11B5/8404
Inventor 堀江祐二奥山弘光谷藤达也
Owner NIHON MICRO COATING