The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 20, 2002
Filed:
Oct. 20, 1999
Bo Liu, Singapore, SG;
Shengbin Hu, Singapore, SG;
C/O Data Storage Institute, Singapore, SG;
Abstract
A method and apparatus of detecting variations in a clearance distance between a magnetic read/write transducer and a magnetic recording disk having a clearance detection burst recorded thereon. The clearance detection burst has at least two groups of bit patterns each having different transition densities. The method may have the steps of obtaining a readback signal from the at least two groups of bit patterns, the readback signal being sensitive to variations in the clearance; detecting the amplitude of the readback signal of a first group. The amplitudes of the readback signals are detected and then compared to provide an indication of a variation in the clearance.