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US 5,853,820 AGranted
Controlled laser texturing glass-ceramic substrates for magnetic recording media
AssigneeSeagate Technology LLC
InventorsDavid Kuo, Don Polensky
Life of this patent
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Abstract
The height of protrusions formed during laser texturing a glass-ceramic substrate is controlled by controlling the amount of the crystalline-phase of the substrate, to less than 70% by volume. In an embodiment, the amount of crystalline-phase is controlled by heating under controlled conditions to convert a glass substrate into the glass-ceramic substrate comprising a controlled amount of crystalline phase.
Claims19
A method of manufacturing a magnetic recording medium, which method comprises:
- texturing a surface of a glass-ceramic substrate with a pulsed, focused laser light beam to form a plurality of protrusions on and extending above the substrate surface;
- wherein the crystalline phase of the glass-ceramic substrate is less than about 70% by volume.
A method of manufacturing a magnetic recording medium, which method comprises:
- texturing a surface of a glass-ceramic substrate with a pulsed, focused laser light beam to form a plurality of protrusions on and extending above the substrate surface;
- and
- controlling the height of the protrusions by controlling the amount of crystalline phase of the glass-ceramic substrate under about 70% by volume.
Dependencies are inferred from the claim text.