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US 2013/0152695 A1Published application
Methods and devices for extracting off-track motion using microactuators
AssigneeSeagate Technology LLC
InventorsNarayanan Ramakrishnan, Stefan Alexander Weissner
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Abstract
In certain embodiments, an apparatus includes a first piezoelectric (PZT) element poled in the same direction as a second PZT element. The first and second PZT elements are configured to be driven while simultaneously sensing motion. The apparatus further includes a circuit configured to add outputs of the first and second PZT elements, extract the sensed motion, and detect off-track motion from the extracted sensed motion.
Claims19
An apparatus comprising:
- a first piezoelectric (PZT) element poled in the same direction as a second PZT element, the first and second PZT elements configured to be driven while simultaneously sensing motion;
- a circuit configured to add outputs of the first and second PZT elements, extract the sensed motion, and detect off-track motion from the extracted sensed motion.
A method comprising:
- sensing a sensing signal responsive to a motion of a first PZT element while simultaneously driving a second PZT element responsive to a driving signal;
- combining the sensing signal and the driving signal to create a composite signal;
- extracting sensed motion from the composite signal;
- and
- detecting off-track motion from the extracted sensed motion.
2 more elements
An apparatus comprising:
- a first and second microactuator configured to be driven while simultaneously sensing motion, the first microactuator configured to output a first sensing signal responsive to a first microactuator deformation, the second microactuator configured to output a second sensing signal responsive to a second microactuator deformation;
- and
- a controller configured to combine the first and second sensing signals to generate a composite signal to detect off-track motion.
Dependencies are inferred from the claim text.