US Patent 7751062 Optical flying height measurement and calibration with dual sliders
Patent 7751062 was granted and assigned to Agency for Science, Technology and Research on July, 2010 by the United States Patent and Trademark Office.
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A method for optical flying height measurement, and a flying height tester. The method the method comprises the steps of aligning a first slider and a second slider adjacent a transparent disk; varying a rotational speed of the disk relative to the first slider whereby a spacing between the first slider and the disk changes; measuring changes in a first reflected light intensity caused by interference of a light signal portion reflected from the first slider and a light signal portion reflected from a surface of the disk, wherein the rotational speed is varied over a range such that one maximum and minimum intensities pair is measured in the reflected light intensity; measuring a second reflected light intensity caused by interference of a light signal portion reflected from the second slider and a light signal portion reflected from a surface of the disk at a fixed rotational speed between the disk and the second slider; and calculate a flying height of the second slider using the measured maximum and minimum intensities pair and the measured second reflected light intensity.
US Patent 07751062 Optical flying height measurement and calibration with dual sliders US Patent 7751062 Optical flying height measurement and calibration with dual sliders
US Patent 07751062 Optical flying height measurement and calibration with dual sliders
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