Optics: measuring and testing – By light interference – Having polarization
Reexamination Certificate
2006-06-20
2006-06-20
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By light interference
Having polarization
Reexamination Certificate
active
07064841
ABSTRACT:
An arrangement and method of measuring head-media spacing modulation (HMS_Wq) removes the portion of out-of-plane motion caused by disk modes from the dynamic measurements of hard disk surface topography. Employing time-domain measurement techniques, circumferential surface topographical measurements are made for a hard disk surface. A boundary wavelength is determined, and a first partial HMS_Wq value is determined based upon measurements taken at a first disk rotational speed. A second partial HMS_Wq value is determined based upon measurements taken at a second disk rotational speed. The first and second partial HMS_Wq values are combined to provide a complete and accurate HMS_Wq value, taking advantage of the principle that the disk mode location in the spatial domain topography spectrum converted from the measured time-domain data shifts when the disk rotation speed is changed during the measurement.
REFERENCES:
patent: 5600441 (1997-02-01), de Groot et al.
patent: 5710631 (1998-01-01), Bou-Ghannam et al.
patent: 5999261 (1999-12-01), Pressesky et al.
patent: 6214430 (2001-04-01), Kim et al.
patent: 6618218 (2003-09-01), Kadowaki et al.
patent: 6741357 (2004-05-01), Wang et al.
Gui Jing
Pressesky Jason L.
Tang Huan
Wang Jianmin
Lyons Michael A.
McDermott Will & Emery LLP
Seagate Technology LLC
Toatley , Jr. Gregory J.
LandOfFree
Method and arrangement for topographically characterizing a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and arrangement for topographically characterizing a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and arrangement for topographically characterizing a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3629258