Manufacturing method of magnetic disk-use glass substrate, and magnetic disk
A technology of glass substrate and manufacturing method, applied in the direction of manufacturing base layer, disc carrier manufacturing, magnetic recording layer, etc., can solve the problems of broken damage, damage, etc., and achieve the effect of inhibiting peeling
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Embodiment 1
[0096] (1) Billet processing process
[0097] A diamond cutter was pressed into the bottom surface of a glass blank (thickness 1 mm) produced by the float method to form cut lines, and cut and bent to produce a rectangular plate-shaped glass substrate of 70 mm×70 mm. It should be noted that, as the glass material, a glass material containing SiO 2 : 58% by weight to 75% by weight, Al 2 o 3 : 5% to 23% by weight, Li 2 O: 3% to 10% by weight, Na 2 O: 4% by weight to 13% by weight of aluminosilicate glass as the main component.
[0098] (2) Shape processing process
[0099] Next, the cutting line 123 constituting the periphery of the outer peripheral side of the region 122 of the glass substrate for a magnetic disk and the cutting line 125 constituting the periphery of the region 124 for forming a circular hole are formed on the bottom surface of the plate glass substrate 121 by a diamond cutter ( refer to Figure 6 (B)). Next, in the plate glass substrate, by selectively...
Embodiment 2
[0106] In the shape processing step, instead of heating with a heater, the top surface of the glass portion for forming the hole is selectively cooled at -20°C with a refrigerant, and an iron member with a conical tip is used as a pressing body. When the pressing body is brought into contact with the glass part to be separated from the glass substrate to be formed with a round hole from the upper side of the main surface and a force is applied downward in the vertical direction, the pressing body does not fly out from the other main surface (lower side) A glass substrate for a magnetic disk was produced in the same manner as in Example 1 except that the press body was controlled by a computer and the glass portion was separated from the glass substrate. In addition, the pressure at the point of contact with the glass part for forming a circular hole was made into about 4.0Kgf.
[0107] (defect check)
[0108] The circular hole formed on the glass substrate was inspected for t...
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