Apparatus and process for measuring data disk runout and acceler

Details Apparatus and process for measuring data disk runout and acceler Apparatus and process for measuring data disk runout and acceler

1989-01-19

1991-04-23

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4425, 369 4432, 360 7702, 360 7809, G11B 1700, G11B 2110

Patent

active

050105353

ABSTRACT:
Runout and acceleration measurements are provided for a disk drive type device using a closed loop actuator to position a transducer element relative to circular and/or spiral tracks on a recording media. The transfer function of the actuator is determined and employed to construct a low pass filter network simulating that transfer function. The servo error signal is processed by the network with the output thereof corresponding to the runout either radially if the radial position servo error signal is processed or axially if the axial position servo error signal is used. Obtaining of the second derivative of the runout signal reflects the measure of acceleration associated with the thus determined runout.

REFERENCES:
patent: 4745588 (1988-05-01), Yoshikawa et al.
patent: 4782474 (1988-11-01), Arai et al.
Integrated Electronics: Analog and Digital Circuits and Systems, Millman et al., McGraw-Hill, 1972, p. 552.

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