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Method for manufacturing glass substrates for cassette and magnetic recording medium

A technology for magnetic recording media and glass substrates, applied in the manufacture of glass substrates for magnetic recording media, and in the field of cartridges

Inactive Publication Date: 2017-06-23
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the drying process, fine drying stains may be generated on the surface of the glass substrate for magnetic recording media

Method used

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  • Method for manufacturing glass substrates for cassette and magnetic recording medium
  • Method for manufacturing glass substrates for cassette and magnetic recording medium
  • Method for manufacturing glass substrates for cassette and magnetic recording medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0140] A glass substrate for a magnetic recording medium was produced in the following procedure.

[0141] First, the SiO obtained by the float glass method 2 The aluminosilicate glass original plate that is the main component is processed into a disc-shaped glass substrate to obtain a glass substrate for magnetic recording media having a concentric circular hole with a diameter of 20 mm and a diameter of 65 mm (molding process).

[0142] Next, chamfering is performed on the end surface portions of the inner periphery and the outer periphery of the glass substrate (chamfering process).

[0143] Next, the upper and lower main surfaces of the glass substrate were polished using alumina abrasive grains (primary polishing step). In one polishing process, using a cast iron flat plate as a grinding tool and a grinding fluid containing alumina abrasive grains, the surface of the glass substrate is polished using a double-sided grinding device (manufactured by SpeedFam, product name:...

Embodiment 2

[0167] In the cleaning / drying process, a glass substrate for a magnetic recording medium was produced and evaluated in the same manner as in Example 1 except for using a cartridge having an exposure rate of 49%. The results are shown in Table 1. And, the change of the surface temperature of the glass substrate 25A during drying in the washing and drying process is as follows: Figure 5 shown.

Embodiment 3

[0169] In the cleaning / drying process, a glass substrate for a magnetic recording medium was produced and evaluated in the same manner as in Example 1 except that a cartridge having a shortest distance between the side plate portion and the glass substrate was used of 4 mm.

[0170] The evaluation results are shown in Table 1. And, the change of the surface temperature of the glass substrate 25A during drying in the washing and drying process is as follows: Figure 5 shown.

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Abstract

The object of this invention is to provide the cartridge which can suppress generation|occurence|production of a drying stain on both main surfaces of the glass substrate for magnetic recording media accommodated. The cartridge includes: a pair of side plate portions formed of a resin material having a specific heat higher than that of glass and having heat resistance and chemical resistance, and facing each other; and a holding portion configured to Between a pair of side plate parts, the disc-shaped magnetic recording medium glass substrate (hereinafter referred to as "glass substrate") with a round hole in the central part is held so that the main surface of the glass substrate and the side plate parts On the other hand, the distance between the surface of the side plate portion facing the glass substrate and the main surface of the glass substrate at the position closest to each side plate portion in the holding portion is between 4mm and 15mm, and the side plate portion is formed from The ratio of the area of ​​the main surface of the main surface of the glass substrate held by the holding portion exposed from the side plate portion is 0 to 50% of the opening extending from the position facing the round hole of the glass substrate held by the holding portion to the upper end. the following.

Description

technical field [0001] The present invention relates to a method for manufacturing a cartridge and a glass substrate for magnetic recording media. Background technique [0002] Conventionally, aluminum alloy substrates have been used as substrates for magnetic recording media used in magnetic disk recording devices and the like. However, in recent years, glass substrates have become mainstream in response to demands for higher recording densities, and glass substrates are harder than aluminum alloy substrates and have excellent flatness and smoothness. [0003] The glass substrate for magnetic recording media is a disk shape which has a concentric opening part in the center part. When manufacturing a glass substrate for a magnetic recording medium, processing-related processes such as processing the original glass substrate into the disc shape described above, polishing the main surface, and polishing the end surface are performed. Next, a cleaning process for removing gri...

Claims

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Application Information

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IPC IPC(8): C03C23/00
CPCC03C23/0085
Inventor 河原贵之宫原修
Owner ASAHI GLASS CO LTD