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Glass substrate for information recording media and its fabricating method

A manufacturing method and information recording technology, which is applied to the manufacture of disc carriers, the base layer of the recording layer, and manufacturing tools, and can solve the problems of reducing the smoothness of the glass substrate and uneven texture

Inactive Publication Date: 2005-11-09
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the texture to become uneven and degrades the smoothness of the glass substrate

Method used

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  • Glass substrate for information recording media and its fabricating method
  • Glass substrate for information recording media and its fabricating method
  • Glass substrate for information recording media and its fabricating method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0091] The first embodiment has the following advantages.

[0092] When forming a texture on a glass substrate using a mechanical texturing method, the glass substrate 11 uses a cross-hatching method. Using the cross-hatching method, the abrasive powder draws a closed trajectory on the major surface of the glass sheet that intersects at least three locations from the beginning to the end of a cycle. In this way, it is possible to prevent adverse effects, such as the same position of the glass plate being scraped, or to form a large area of ​​unscraped area, and the Nra of the main surface is 0.2nm or less and the RA of the main surface is 0.5nm or less glass The substrate is fabricated. Therefore, an undulating texture is formed without reducing the smoothness of the main surface.

[0093] In the cross-hatch method, the rotational speed R of the glass sheet and the vibration frequency of the drum are asynchronous. This allows the abrasive powder to reliably trace on the maj...

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Abstract

The invention provides a method for fabricating a glass substrate for information recording media. A uniform texture can be formed in a major surface of the glass substrate without degrading the smoothness of the major surface. The method comprises a step of forming a texture in a major surface of a disk-shaped glass substrate by lapping the major surface with a lapping member while supplying an abrasive material onto the major surface. In the step, the glass substrate is reciprocated in a radial direction while rotating the glass substrate around its center at a predetermine rotational speed. The rotational speed, the reciprocating speed, and the reciprocation stroke are so determined that the locus of every particle of the abrasive material crosses itself at least at three points.

Description

technical field [0001] The present invention relates to a method for manufacturing a glass substrate having a main surface on which a texture is formed, and more particularly to a method for manufacturing a glass substrate for an information recording medium, the information recording medium , such as magnetic disks, magneto-optical disks, and optical disks are mounted in an information recording device such as a hard disk drive. Background technique [0002] Generally, a magnetic disk is fabricated by laminating a magnetic film and a protective film on the main surface of a disc-shaped glass substrate. In order to record a large amount of data on a magnetic disk at high density, the main surface of the glass substrate is polished smoothly. However, when the main surface is polished smoothly, a magnetic head for reading information from and writing information to the magnetic disk tends to attach to the magnetic disk. Therefore, in order to re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C19/00
CPCC03C19/00
Inventor 松本诚司
Owner HOYA CORP