Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1986-02-10
1988-10-04
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 77, 318685, 318696, G11B 2108, G11B 2110, G11B 5596, G11B 555
Patent
active
047759020
ABSTRACT:
The apparatus records and reads binary information on a magnetic disk having magnetizable surfaces subdivided into a plurality of concentric tracks in which the information is recorded in block form (sectors). A first electric motor rotates the magnetic disk at a substantially constant angular velocity, and a second motor (22) of stepping type is operable to position the magnetic recording and reading heads (16, 17) with respect to the recording tracks of the disk. On each track, each block of binary information contains prerecorded burst information which, when read by the corresponding magnetic head, is capable of causing micrometric rotary adjusting movements of the stepping motor to bring the magnetic head into precise alignment with the selected recording track and to hold it in that position. Thus amplitude information from two bursts either side of the center line of the track is compared (52, 55, 59, 58) to provide a signal (.mu.STEP) when the amplitude discrepancy exceeds a threshold, and a signal (.mu.DIR) indicating the sense of the discrepancy. A motor control circuit (61) effects micro-steps by applying pulses to the stepping motor (22) with duty cycle modulation.
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Picerno Giuseppe
Trovato Antonio
Cardillo Raymond F.
Garland Steven R.
Ing. C. Olivetti & C. S.p.A.
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