Calibration disk with disk bumps for calibrating PZT sliders

Details Calibration disk with disk bumps for calibrating PZT sliders Calibration disk with disk bumps for calibrating PZT sliders

1996-02-27

1997-11-18

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01B 528

Patent

active

056890575

ABSTRACT:
Crater shaped bumps are made on a calibration disk which can be used for calibrating a PZT slider, the PZT slider in turn being used for detecting predetermined asperities on a production run magnetic disk. The crater shaped bumps emulate predetermined asperities of production run magnetic disks and especially asperities which are undesirable and would cause the production run disk to be discarded after testing by the PZT slider. Crater shaped bumps which emulate undesirable asperities on current production runs of magnetic disks 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 a calibration 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. Different arrangements of the crater shaped bumps on a calibration disk are provided for increasing the range of calibration of the PZT slider.

REFERENCES:
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patent: 5236763 (1993-08-01), Luthi
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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