Electricity: motive power systems – Positional servo systems
Patent
1988-11-25
1990-08-07
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
318561, 318608, 318632, 360 7303, 360 7304, G05B 1300
Patent
active
049470930
ABSTRACT:
A shock resistant hard disk drive system employs a plurality of magnetic disks for recording data, a plurality of magnetic heads for performing input/output operation on the magnetic disks, with at least one of the magnetic heads being used as a servo head, a head-positioning mechanism for controlling the movement of the magnetic heads, a servo control mechanism or servo loop for opposing shifts in the location of the servo head, detecting device for detecting and measuring certain accelerations applied to the system, and filtering device for filtering the output of said detecting device and for providing the signal to the head-positioning mechanism. The detecting device detects and measures the magnitude of internal or external accelerations or shocks applied to the system, and provides the necessary signals to counter such accelerations. The pre-existing phase locked loop includes a voltage controlled oscillator, with the voltage control signal applied to the oscillator indicating instantaneous rotational velocity resulting from accelerations applied to the system; and this control signal is modified and applied to servo loop for the head positioner, to hold the head positioner against shifting off track.
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Dunstan Ericson M.
Hogg Dennis
Scura John E.
Sheu Ming-Goei
Ip Paul
Micropolis Corporation
Shoop Jr. William M.
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