Head spacing control

Details Head spacing control Head spacing control

1977-12-23

1979-03-27

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360109, 360 97, G11B 2102, G11B 2120, G11B 5012

Patent

active

041469119

ABSTRACT:
Embodiment illustrates technique for better controlling "head spacing" i.e., spacing of a magnetic transducer from the recording surface of a moving medium, such as a magnetic disk -- this involving impressing signals on the recording surface (along a given track) at two prescribed frequencies, so that, upon detection of this signal, one frequency will be attenuated discriminatorily more than the other at all "erroneous" head spacings whereby a "null-seeking" servo control and associated head elevation system may be monitored to maintain optimum head spacing, (e.g., where two frequencies detected at same amplitude). Better control of head/medium spacing in non-contact magnetic recording systems is achieved, especially where one signal is a very high frequency signal which is significantly attenuated whenever there is significant spacing error, while it is readily detected at the proper spacing; while the other signal is relatively unaffected by head spacing.

REFERENCES:
patent: 3183516 (1965-05-01), Sliter
patent: 3614579 (1971-10-01), Fulton
patent: 3632900 (1972-01-01), Kurzweil, Jr.
patent: 3706861 (1972-12-01), Giel
patent: 3974524 (1976-08-01), Griffiths et al.

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