Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1987-01-20
1988-10-18
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 5596, G11B 2110
Patent
active
047791489
ABSTRACT:
A system for detecting an off-track amount of a present head position with respect to a normal position of a desired track on a disc in a disc storage unit in which a closed loop control is employed to control the position of a magnetic head. A repetitive pattern is stored as reference information in each reference information region on the disc in such a way that it is deviated in the longitudinal direction of a track from the repetitive patterns stored in the adjacent regions. When the reference information in the two adjacent regions is read out by the head, a ramp signal whose gradient is varied in accordance with the position of a desired track is generated in synchronism with the readout of the reference information. The ramp signal is used as a threshold value and the numbers of the repetitive pattern signals obtained from the signals read out from the reference information in the two adjacent regions which are in excess of the threshold value is counted. Then, in accordance with the difference between the two counted values thus obtained from the two regions, an off-track amount of the head position from the normal position of a desired track is detected.
REFERENCES:
patent: 4530019 (1985-07-01), Penniman
patent: 4564869 (1986-01-01), Baumeister
patent: 4745497 (1988-05-01), Ozawa
Cardillo Raymond F.
Fuji Electric Company Ltd.
Robertson David L.
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