Measuring and testing – Instrument proving or calibrating – Roughness or hardness
Patent
1998-09-30
2000-12-26
Raevis, Robert
Measuring and testing
Instrument proving or calibrating
Roughness or hardness
G11B 582
Patent
active
061641189
ABSTRACT:
A calibration disk for calibrating the fly height of a head, includes spaced circumferencial bands on the disk extending in a concentric fashion from adjacent an outer diameter of the disk to near an inner diameter of the disk. Each of the bands include radial and circumferencial spaced asperity emulating bumps having a population sufficient to produce a constant and continuous output signal from a glide head when the glide head flies lower than a maximum height of the bumps. The height of the bumps within individual bands are substantially uniform, and the average heights of the bumps in each band differ from each other. The configuration of the bumps on the calibration disk advantageously avoids errors caused by disk waviness, runout, and contamination. Further, using the differing heights of the bumps on the calibration disk, a glide head can be calibrated on the glide tester without using an independent fly height measurements for the glide head. Thus, errors in the fly height measurement and the delay in mounting each glide head to a fly height tester are avoided.
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Phase Metrics DFHT Manual 30, 150 Rev. D, Nov. 1, 1994, pp. 7-14.
Frusescu Dan
Hua Tuan H.
Patel Jayadev P.
Shiraki Daryl M.
Suzuki Shoji
Halbert Michael J.
Komag Incorporated
Raevis Robert
Steuber David E.
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