Calibration disk with disk bumps for calibrating PZT sliders

Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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:
patent: Re33777 (1991-12-01), Woodroffe
patent: 4532802 (1985-08-01), Yeack-Scranton et al.
patent: 4608480 (1986-08-01), Bizot et al.
patent: 4725472 (1988-02-01), Okabe
patent: 4931338 (1990-06-01), Toffle
patent: 5062021 (1991-10-01), Ranjan et al.
patent: 5108781 (1992-04-01), Ranjan et al.
patent: 5143578 (1992-09-01), Luthi
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.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Calibration disk with disk bumps for calibrating PZT sliders does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Calibration disk with disk bumps for calibrating PZT sliders, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Calibration disk with disk bumps for calibrating PZT sliders will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1567579

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.