Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1983-12-14
1986-08-12
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360102, 360109, G11B 2120, G11B 560
Patent
active
046059776
ABSTRACT:
A magnetic head slider for supporting a flying head on a magnetic disk has a plurality of rails extended longitudinally between the slider and the disk which provide the air bearing surface and define a channel parallel to the motion of the data track. A flexible beam is affixed to the leading edge of the channel providing a cantilever structure. A magnetic head is mounted on the free end of the cantilever. A pair of oppositely polarized piezoelectric crystals are mounted on the cantilever assembly. When energized by an electrical driving source, the cantilever beam is flexed upwards or downwards thereby changing the distance of the magnetic head from the disk. A capacitive proximity sensor is coupled to the magnetic head for sensing the height of the head above the data track. The output of the sensor is fed to the driving source and energizes the piezoelectric crystals in the polarity desired for the corresponding deflection of the cantilever structure. Thus, the sensor continuously monitors the height of the magnetic head from the track and provides a correction signal to maintain the transducer at a constant predetermined height above the track. In a preferred embodiment, the beam is formed from silicon nitride composition and treated by means of an ion implantation process to provide a conductive electrode for the capacitance proximity sensor. By connecting the proximity sensor, the deflectable piezoelectric transducer, and the electrical driving circuit in a closed loop, the magnetic head is maintained at a predetermined distance from the magnetic disk, notwithstanding perturbations in disk surface and changes due to dynamic instability.
REFERENCES:
patent: 3201526 (1965-08-01), Wessels et al.
patent: 3706861 (1972-12-01), Giel
patent: 3732552 (1973-05-01), Walraven
patent: 3863124 (1975-01-01), Pierce et al.
patent: 4130847 (1978-12-01), Head et al.
Albin Arnold L.
Bussan Matthew J.
Sperry Corporation
Terry Howard P.
Wolff John H.
LandOfFree
Air bearing head displacement sensor and positioner does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Air bearing head displacement sensor and positioner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Air bearing head displacement sensor and positioner will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1947505