Magnetic disk landing zone and method for making
AssigneeHyundai Electronics America
InventorsJia J. Liu, Wenjun Li
Life of this patent
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Abstract
A magnetic disk (2) has an improved landing zone (8) created by directing a series of effectively overlapping laser discharges onto the landing zone to create a continuous ridge (22) extending outwardly from the base surface (4) of the landing zone. The effectively overlapping discharges are typically from a series of discharges from a pulsed laser, the discharges overlapping from about 0% to about 99%. By creating a continuous ridge, a larger diameter laser beam can be used so the depth of focus is much greater than with conventional small diameter, non-overlapping, discrete laser discharges. This aids manufacturability because the larger diameter beam spots are easier to create and the greater depth of focus accommodates fluctuations in the height of the surface of the disk.
Claims21
A magnetic disk comprising:
- a body comprising a disk surface and a center of rotation;
- and
- said disk surface comprising a data surface region and a head landing zone surface region;
- said head landing zone surface region comprising:
- a base surface;
- and
- a continuous ridge extending outwardly away from said base surface to an upper edge so the ridge has a height measure between said upper edge and said base surface, said continuous ridge extending along an arcuate path circumscribing the center of rotation.
A method for producing landing zone structure at a landing zone surface region of a magnetic disk having a center of rotation comprising the following steps:
- directing a series of effectively overlapping laser discharges onto the landing zone surface region;
- and
- controlling the laser discharges to form a continuous ridge extending:
- outwardly from a base surface of the landing zone surface region;
- and
- along an arcuate path circumscribing the center of rotation.
Dependencies are inferred from the claim text.