Method and apparatus for measuring the flying height of a magnet

Details Method and apparatus for measuring the flying height of a magnet Method and apparatus for measuring the flying height of a magnet

1994-08-19

1996-03-26

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356361, G01B 902

Patent

active

055025650

ABSTRACT:
This invention provides a method and apparatus for accurately measuring the flying height of a magnetic head at high speed by using a white lamp and a color CCD camera. The invention entails substituting tentative refraction coefficients and extinction coefficients representative of colors in theoretical equations expressing the relationship between interference light intensity and flying height, thereby optimizing the parameters by non-linear regression. The flying height of a magnetic head is measured by using the coefficient thus determined. Also, this invention enables determination of flying height at very high speed through effecting the above optimization in consideration of constants associated with the shape of the head under consideration, and adapting the above theoretical equations.

REFERENCES:
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patent: 5218424 (1993-06-01), Sommargren
patent: 5280340 (1994-01-01), Lacey
patent: 5311287 (1994-05-01), Amer
J. M. Fleischer et al., "Infrared Laser Interferometer for Measuring Air-bearing Separation", IBM J. Res. Develop., Nov., 1974, pp. 529-533.
T. Ohkubo et al., "Accurate Measurement of Gas-Lubricated Slider Bearing Separation Using Visible Laser Interferometry", Journal of Tribiology Transactions of the ASME, vol. 110, Jan. 1988, pp. 148-155.
D. L. Lipschutz, "Dynamic Measurement of Small Separations by a Light Interference Method", IEEE:Proceedings of the International Conference on Magnetic Recording, London, Jul. 1964, pp. 87-90.
A. Nigam, "A Visible Laser Interferometer for Air Bearing Separation Measurement to Submicron Accuracy", Journal of Lubrication Technology Transactions for the ASME, vol. 104, Jan. 1982, pp. 60-65.

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