Digitally responsive system for positioning a transducer of a st

Details Digitally responsive system for positioning a transducer of a st Digitally responsive system for positioning a transducer of a st

1984-12-06

1988-01-19

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 5596, G11B 2110

Patent

active

047207540

ABSTRACT:
A servo system, for positioning a transducer of a rotatable storage apparatus over a servo tracks of a magnetic disc processes trains of positioning pulse signals. A reference voltage, changing with time, having a predetermined pattern, is generated and compared with a train of positioning pulse signals. The magnitude of the positioning signals, which varies with the displacement of the transducer from a guide path to be followed, the number of the positioning signals exceeding the reference voltage pattern is counted and an error signal for the servo system is determined as a function of the count and is fed back in a digital form.

REFERENCES:
patent: 4157577 (1979-06-01), Porter, Jr. et al.
patent: 4322760 (1982-03-01), Hardwick
patent: 4400747 (1983-08-01), Siverling
patent: 4454549 (1984-06-01), Pennington
patent: 4530019 (1985-07-01), Penniman
patent: 4546395 (1985-10-01), Sellars
IBM TDB, vol. 23, No. 2, "Servo System for Magnetic Recording Based on Time Comparison", Gruss et al., 7/80, pp. 787-789.
Electronics International, vol. 56, No. 5, Mar. 10, 1983, pp. 139-142, New York, U.S.; L. Sarisky: "Refined Closed-Loop Servo Enhances Low-Cost Disk Drive's Accuracy".

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