Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1992-02-25
1994-05-10
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
356375, 360103, G01B 1100
Patent
active
053112873
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.
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patent: 4593368 (1986-06-01), Fridge et al.
patent: 5031055 (1991-07-01), Vanagisawa
patent: 5142424 (1992-08-01), Hatamura
patent: 5148415 (1992-09-01), Takeuchi
Evans F. L.
International Business Machines - Corporation
Trepp Robert M.
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