Method of making disk bumps with laser pulses

Details Method of making disk bumps with laser pulses Method of making disk bumps with laser pulses

1996-02-27

1997-05-20

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Displacement, motion, distance, or position

29557, B23K 2600

Patent

active

056314086

ABSTRACT:
A method is provided for making crater shaped bumps on a magnetic disk. The crater shaped bumps have a diameter in the range of 10 to 25 .mu.m and a peripheral ridge with a height h.sub.r above a nominal surface of the calibration disk in the range of 75 to 120 nm. Close tolerance crater shaped bumps with this configuration can be made by impinging two or more pulses of laser energy on the same location of the disk. By increasing the number of pulses the height of the peripheral ridge progressively increases. By employing multiple pulses, the height of the peripheral ridge is increased while the diameter of the crater shaped bump stays substantially constant. Further, by employing multiple pulses diameters and heights of crater shaped bumps can be produced with close tolerances within a diameter range of 5 to 20 .mu.m and a height range of 2 to 120 nm.

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N. D. Mackintosh et al., "A Standard Disk for Calibrating Head-Disk Interference Measuring Equipment," IEEE Transactions on Magnetics, vol. Mag-18, No. 6, Nov. 1982, pp. 1230-1232.

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