Tracking servo control

Details Tracking servo control Tracking servo control

1987-10-20

1989-08-15

McElheny, Jr., Donald

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

369 32, G11B 2108

Patent

active

048580414

ABSTRACT:
In a disc drive head positioning system a reference signal generator synthesizes a real time analogue representation of a perfect signal as would be outputted by the tracking sensor during a theoretically perfect movement to the desired disc track, which is used as a reference; the analogue representation is subtractively combined with the actual signal generated by the sensor during movement; and the difference forms the error signal that controls the sensor's position.

REFERENCES:
patent: 4138663 (1979-02-01), Lehureau et al.
patent: 4481613 (1984-11-01), Yokota
patent: 4482992 (1984-11-01), Shimizu et al.
patent: 4484319 (1984-11-01), Koishi et al.
patent: 4545003 (1985-10-01), Hirano et al.
patent: 4575776 (1986-03-01), Stephens et al.
patent: 4613916 (1986-09-01), Johnson
patent: 4615023 (1986-09-01), Inada et al.
patent: 4622604 (1986-11-01), Hashimoto

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