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:
May. 10, 1994
Filed:
Feb. 25, 1992
Nabil M Amer, Armonk, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An apparatus and method for direct measurement for head/disc interface dynamics in a head/disc assembly is described incorporating two light beams positioned to reflect off two surfaces, two position sensitive detectors for receiving reflected light beams, and a processor for determining the displacement of the surfaces. The processor may further include circuitry for determining the change of displacement as a function of time of the two surfaces and for correlating displacement signals and change of displacement signals with themselves or with other predetermined stored signals to provide an indication of the operating status of the head/disc assembly. The invention overcomes the problem of experiencing unexpected head crashes and of predicting timely preventive maintenance of the head/disc assembly.