Magnetic disk landing zone and method for making

Details Magnetic disk landing zone and method for making Magnetic disk landing zone and method for making

1998-04-21

2000-11-14

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428141, 428694TR, 428694SG, 428694BR, 428900, 427129, 427130, 427555, 427596, G11B 566

Patent

active

061467367

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.

REFERENCES:
patent: 5108781 (1992-04-01), Ranjan
patent: 5635269 (1997-06-01), Weir
patent: 5768076 (1998-06-01), Baumgart
D. Baumgart, et al, "Safe Landings: Laser texturizing of high-density magnetic disks", Reprint from Mar. 1996 edition of Data Storage.
D. Kuo et al., "Design of Laser Zone Texture for Low Glide Media", IEEE Trans on Magnetics, vol. 32, No. 5, Sep. 1996, pp. 3753-3758.
P. Baumgart et al., "Safe Landings: Laser texturing of high-density magnetic disks", Reprint from Mar. 1996 edition of Data Storage, four pages.

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