Title: Track servoing system using signals from tunnel erase heads

Abstract: A track servoing system is disclosed which is particularly useful with floppy disk memories. The system improves the positioning accuracy of a read/write head during a reading operation through the use of tunnel erase heads as read heads. The tunnel erase heads are positioned on either side of the read/write head and their outputs are differentially measured to provide direction and magnitude information to servo positioning electronics. The invention is particularly reliable in reading eccentric variations in data tracks caused by environment, i.e., humidity, temperature, etc.

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Inventors: Brown, Timothy R. (Westboro, MA, US)

Application Number: 895393
Filing Date: 1978-04-11
Publication_date: 1979-08-14
Assignee: Decitek (Worcester, MA)
Primary Class(es): 360/77.06 360/66, 360/118, 360/121
Other Classes:
US Patent Ref:

3246307	Apr, 1966	Stanley	360/77.
3541270	Nov, 1970	Walther	360/77.
3852812	Dec, 1974	Reisfeld	360/118.
4055849	Oct, 1977	Hickok	360/121.

Other Refs:
Primary Examiner: Eddleman, Alfred H.
Assistant Examiner:
Attorney: Oblon, Fisher, Spivak, McClelland & Maier