Interferometric flying height measuring device including an addi

Details Interferometric flying height measuring device including an addi Interferometric flying height measuring device including an addi

1993-04-29

1995-12-05

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356357, G01B 902

Patent

active

054734312

ABSTRACT:
A device for accurately measuring flying heights of a read/write head in a disk drive down to zero microinches using interferometry, wherein the flying height of the head above the disk surface is calculated by directing white light to the under side of a rotating disk. An interference pattern is obtained by reflecting a first portion of the light off of the top surface of the disk and reflecting a second portion of the light off of the underside of the read/write head, and then recombining the first and second portions of light. The interference pattern is then input to a spectrophotometer, which creates an intensity profile from which the flying height of the read/write head above the disk may be calculated. A spacer layer is provided on the upper surface of the disk to increase the phase difference of the first and second portions of light, thereby allowing clear interpretation of the interference pattern at extremely low flying heights.

REFERENCES:
patent: 3653760 (1972-04-01), Johnson
patent: 4486096 (1984-12-01), Endo et al.
patent: 4593368 (1986-06-01), Fridge et al.
patent: 4822169 (1989-04-01), Distl et al.
patent: 5097368 (1992-03-01), Lemke et al.
patent: 5202803 (1993-04-01), Albrecht et al.
Phase Metrics--"Dynamic Flying Height Tester".
Pacific Precision Labs, Inc. "Digital Flying Height Testing".
Muranushi, Tanaka and Takeuchi--"Estimation of the Zero-Spacing Error Due to a Phase Shift of Reflected Light in Measuring a Magnetic Head Slider's Flying Height by Light Interference"--Oct. 8, 1991.
Pacific Precision Lab., Inc.--"Automatic Digital Flying Height Tester"--1988.
Johnston, Wayte and Spikes--"The Measurement and Study of Very Thin Lubricant Films in Concentrated Contacts.COPYRGT."--Apr. 5, 1990.

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