Method and apparatus to measure disk drive head load/unload...

Details Method and apparatus to measure disk drive head load/unload... Method and apparatus to measure disk drive head load/unload...

2005-05-17

2005-05-17

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

C318S601000, C360S075000

Reexamination Certificate

active

06894453

ABSTRACT:
One embodiment of the present invention is an apparatus to provide a measure of disk drive head velocity in a disk drive wherein movement is produced by a disk drive motion mechanism that includes a coil, which apparatus includes: (a) a controller that outputs one or more digital signals that are applied as input to a first component, and in response, the first component outputs a reference voltage; (b) a second component, responsive to voltage output across the coil and the reference voltage, outputs a measure of a difference between the coil voltage and the reference voltage; and (c) a third component, responsive to the measure of the difference, outputs a first value if the coil voltage is greater than the reference voltage and a second value if the coil voltage is less than the reference voltage, which third component output is applied as input to the controller; wherein the controller executes a search algorithm that varies the one or more digital signals while observing changes in the third component output to provide a digital estimate of the coil voltage, which estimate provides a measure of the disk drive head velocity.

REFERENCES:
patent: 4879612 (1989-11-01), Freeze et al.
patent: 5384524 (1995-01-01), Romano
patent: 5615064 (1997-03-01), Blank et al.
patent: 6118616 (2000-09-01), Jeong
patent: 6507451 (2003-01-01), Sugimoto
patent: 6566838 (2003-05-01), Maiocchi

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