Laser texturing of magnetic recording medium using multiple lens

Details Laser texturing of magnetic recording medium using multiple lens Laser texturing of magnetic recording medium using multiple lens

1997-10-27

1999-08-31

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428 655, 428 656, 428 657, 428 658, 428694TR, 428694SG, 428694TC, 428900, 360135, G11B 582

Patent

active

059451971

ABSTRACT:
A magnetic recording medium is textured with a pulsed laser light beam through a multiple lens focusing system. The use of a multiple lens focusing system enables the formation of a plurality of relatively uniform protrusions smaller than those obtained with a single lens focusing system, thereby avoiding abrupt local profile changes. In an embodiment, the laser light beam is split, as by offsetting the lenses, to obtain a plurality of pairs of even smaller protrusions than obtained with a laser light beam having a centralized energy profile. The pulsed, multiple lens focused laser light beam can be used to texture a substrate, underlayer or magnetic layer. The resulting laser textured magnetic recording medium exhibits improved flying stability, glide performance and reliability.

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P. Baumgart et al., "A New Laser Texturing Technique for High Performance Magnetic Disk Drives," IEEE Transactions on Magnetics, vol. 31, No. 6, pp. 2946-2951, Nov., 1955.

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